drivers/net/vxlan/vxlan_core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VXLAN: Virtual eXtensible Local Area Network
   4  *
   5  * Copyright (c) 2012-2013 Vyatta Inc.
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/errno.h>
  13 #include <linux/slab.h>
  14 #include <linux/udp.h>
  15 #include <linux/igmp.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/ethtool.h>
  18 #include <net/arp.h>
  19 #include <net/ndisc.h>
  20 #include <net/gro.h>
  21 #include <net/ipv6_stubs.h>
  22 #include <net/ip.h>
  23 #include <net/icmp.h>
  24 #include <net/rtnetlink.h>
  25 #include <net/inet_ecn.h>
  26 #include <net/net_namespace.h>
  27 #include <net/netns/generic.h>
  28 #include <net/tun_proto.h>
  29 #include <net/vxlan.h>
  30 #include <net/nexthop.h>
  31
  32 #if IS_ENABLED(CONFIG_IPV6)
  33 #include <net/ip6_tunnel.h>
  34 #include <net/ip6_checksum.h>
  35 #endif
  36
  37 #include "vxlan_private.h"
  38
  39 #define VXLAN_VERSION   "0.1"
  40
  41 #define FDB_AGE_DEFAULT 300 /* 5 min */
  42 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  43
  44 /* UDP port for VXLAN traffic.
  45  * The IANA assigned port is 4789, but the Linux default is 8472
  46  * for compatibility with early adopters.
  47  */
  48 static unsigned short vxlan_port __read_mostly = 8472;
  49 module_param_named(udp_port, vxlan_port, ushort, 0444);
  50 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  51
  52 static bool log_ecn_error = true;
  53 module_param(log_ecn_error, bool, 0644);
  54 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  55
  56 unsigned int vxlan_net_id;
  57
  58 const u8 all_zeros_mac[ETH_ALEN + 2];
  59 static struct rtnl_link_ops vxlan_link_ops;
  60
  61 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  62
  63 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
  64
  65 /* salt for hash table */
  66 static u32 vxlan_salt __read_mostly;
  67
  68 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
  69 {
  70         return vs->flags & VXLAN_F_COLLECT_METADATA ||
  71                ip_tunnel_collect_metadata();
  72 }
  73
  74 #if IS_ENABLED(CONFIG_IPV6)
  75 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
  76 {
  77         if (nla_len(nla) >= sizeof(struct in6_addr)) {
  78                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
  79                 ip->sa.sa_family = AF_INET6;
  80                 return 0;
  81         } else if (nla_len(nla) >= sizeof(__be32)) {
  82                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
  83                 ip->sa.sa_family = AF_INET;
  84                 return 0;
  85         } else {
  86                 return -EAFNOSUPPORT;
  87         }
  88 }
  89
  90 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
  91                               const union vxlan_addr *ip)
  92 {
  93         if (ip->sa.sa_family == AF_INET6)
  94                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
  95         else
  96                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
  97 }
  98
  99 #else /* !CONFIG_IPV6 */
 100
 101 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 102 {
 103         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 104                 return -EAFNOSUPPORT;
 105         } else if (nla_len(nla) >= sizeof(__be32)) {
 106                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 107                 ip->sa.sa_family = AF_INET;
 108                 return 0;
 109         } else {
 110                 return -EAFNOSUPPORT;
 111         }
 112 }
 113
 114 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 115                               const union vxlan_addr *ip)
 116 {
 117         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 118 }
 119 #endif
 120
 121 /* Find VXLAN socket based on network namespace, address family, UDP port,
 122  * enabled unshareable flags and socket device binding (see l3mdev with
 123  * non-default VRF).
 124  */
 125 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 126                                           __be16 port, u32 flags, int ifindex)
 127 {
 128         struct vxlan_sock *vs;
 129
 130         flags &= VXLAN_F_RCV_FLAGS;
 131
 132         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 133                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 134                     vxlan_get_sk_family(vs) == family &&
 135                     vs->flags == flags &&
 136                     vs->sock->sk->sk_bound_dev_if == ifindex)
 137                         return vs;
 138         }
 139         return NULL;
 140 }
 141
 142 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs,
 143                                            int ifindex, __be32 vni,
 144                                            struct vxlan_vni_node **vninode)
 145 {
 146         struct vxlan_vni_node *vnode;
 147         struct vxlan_dev_node *node;
 148
 149         /* For flow based devices, map all packets to VNI 0 */
 150         if (vs->flags & VXLAN_F_COLLECT_METADATA &&
 151             !(vs->flags & VXLAN_F_VNIFILTER))
 152                 vni = 0;
 153
 154         hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
 155                 if (!node->vxlan)
 156                         continue;
 157                 vnode = NULL;
 158                 if (node->vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
 159                         vnode = vxlan_vnifilter_lookup(node->vxlan, vni);
 160                         if (!vnode)
 161                                 continue;
 162                 } else if (node->vxlan->default_dst.remote_vni != vni) {
 163                         continue;
 164                 }
 165
 166                 if (IS_ENABLED(CONFIG_IPV6)) {
 167                         const struct vxlan_config *cfg = &node->vxlan->cfg;
 168
 169                         if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
 170                             cfg->remote_ifindex != ifindex)
 171                                 continue;
 172                 }
 173
 174                 if (vninode)
 175                         *vninode = vnode;
 176                 return node->vxlan;
 177         }
 178
 179         return NULL;
 180 }
 181
 182 /* Look up VNI in a per net namespace table */
 183 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
 184                                         __be32 vni, sa_family_t family,
 185                                         __be16 port, u32 flags)
 186 {
 187         struct vxlan_sock *vs;
 188
 189         vs = vxlan_find_sock(net, family, port, flags, ifindex);
 190         if (!vs)
 191                 return NULL;
 192
 193         return vxlan_vs_find_vni(vs, ifindex, vni, NULL);
 194 }
 195
 196 /* Fill in neighbour message in skbuff. */
 197 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 198                           const struct vxlan_fdb *fdb,
 199                           u32 portid, u32 seq, int type, unsigned int flags,
 200                           const struct vxlan_rdst *rdst)
 201 {
 202         unsigned long now = jiffies;
 203         struct nda_cacheinfo ci;
 204         bool send_ip, send_eth;
 205         struct nlmsghdr *nlh;
 206         struct nexthop *nh;
 207         struct ndmsg *ndm;
 208         int nh_family;
 209         u32 nh_id;
 210
 211         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 212         if (nlh == NULL)
 213                 return -EMSGSIZE;
 214
 215         ndm = nlmsg_data(nlh);
 216         memset(ndm, 0, sizeof(*ndm));
 217
 218         send_eth = send_ip = true;
 219
 220         rcu_read_lock();
 221         nh = rcu_dereference(fdb->nh);
 222         if (nh) {
 223                 nh_family = nexthop_get_family(nh);
 224                 nh_id = nh->id;
 225         }
 226         rcu_read_unlock();
 227
 228         if (type == RTM_GETNEIGH) {
 229                 if (rdst) {
 230                         send_ip = !vxlan_addr_any(&rdst->remote_ip);
 231                         ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
 232                 } else if (nh) {
 233                         ndm->ndm_family = nh_family;
 234                 }
 235                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 236         } else
 237                 ndm->ndm_family = AF_BRIDGE;
 238         ndm->ndm_state = fdb->state;
 239         ndm->ndm_ifindex = vxlan->dev->ifindex;
 240         ndm->ndm_flags = fdb->flags;
 241         if (rdst && rdst->offloaded)
 242                 ndm->ndm_flags |= NTF_OFFLOADED;
 243         ndm->ndm_type = RTN_UNICAST;
 244
 245         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 246             nla_put_s32(skb, NDA_LINK_NETNSID,
 247                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 248                 goto nla_put_failure;
 249
 250         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 251                 goto nla_put_failure;
 252         if (nh) {
 253                 if (nla_put_u32(skb, NDA_NH_ID, nh_id))
 254                         goto nla_put_failure;
 255         } else if (rdst) {
 256                 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
 257                                                   &rdst->remote_ip))
 258                         goto nla_put_failure;
 259
 260                 if (rdst->remote_port &&
 261                     rdst->remote_port != vxlan->cfg.dst_port &&
 262                     nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 263                         goto nla_put_failure;
 264                 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 265                     nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 266                         goto nla_put_failure;
 267                 if (rdst->remote_ifindex &&
 268                     nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 269                         goto nla_put_failure;
 270         }
 271
 272         if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
 273             nla_put_u32(skb, NDA_SRC_VNI,
 274                         be32_to_cpu(fdb->vni)))
 275                 goto nla_put_failure;
 276
 277         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 278         ci.ndm_confirmed = 0;
 279         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 280         ci.ndm_refcnt    = 0;
 281
 282         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 283                 goto nla_put_failure;
 284
 285         nlmsg_end(skb, nlh);
 286         return 0;
 287
 288 nla_put_failure:
 289         nlmsg_cancel(skb, nlh);
 290         return -EMSGSIZE;
 291 }
 292
 293 static inline size_t vxlan_nlmsg_size(void)
 294 {
 295         return NLMSG_ALIGN(sizeof(struct ndmsg))
 296                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 297                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 298                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 299                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 300                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 301                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 302                 + nla_total_size(sizeof(struct nda_cacheinfo));
 303 }
 304
 305 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 306                                struct vxlan_rdst *rd, int type)
 307 {
 308         struct net *net = dev_net(vxlan->dev);
 309         struct sk_buff *skb;
 310         int err = -ENOBUFS;
 311
 312         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 313         if (skb == NULL)
 314                 goto errout;
 315
 316         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 317         if (err < 0) {
 318                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 319                 WARN_ON(err == -EMSGSIZE);
 320                 kfree_skb(skb);
 321                 goto errout;
 322         }
 323
 324         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 325         return;
 326 errout:
 327         if (err < 0)
 328                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 329 }
 330
 331 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
 332                             const struct vxlan_fdb *fdb,
 333                             const struct vxlan_rdst *rd,
 334                             struct netlink_ext_ack *extack,
 335                             struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 336 {
 337         fdb_info->info.dev = vxlan->dev;
 338         fdb_info->info.extack = extack;
 339         fdb_info->remote_ip = rd->remote_ip;
 340         fdb_info->remote_port = rd->remote_port;
 341         fdb_info->remote_vni = rd->remote_vni;
 342         fdb_info->remote_ifindex = rd->remote_ifindex;
 343         memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
 344         fdb_info->vni = fdb->vni;
 345         fdb_info->offloaded = rd->offloaded;
 346         fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
 347 }
 348
 349 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
 350                                               struct vxlan_fdb *fdb,
 351                                               struct vxlan_rdst *rd,
 352                                               bool adding,
 353                                               struct netlink_ext_ack *extack)
 354 {
 355         struct switchdev_notifier_vxlan_fdb_info info;
 356         enum switchdev_notifier_type notifier_type;
 357         int ret;
 358
 359         if (WARN_ON(!rd))
 360                 return 0;
 361
 362         notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
 363                                : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
 364         vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
 365         ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
 366                                        &info.info, extack);
 367         return notifier_to_errno(ret);
 368 }
 369
 370 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 371                             struct vxlan_rdst *rd, int type, bool swdev_notify,
 372                             struct netlink_ext_ack *extack)
 373 {
 374         int err;
 375
 376         if (swdev_notify && rd) {
 377                 switch (type) {
 378                 case RTM_NEWNEIGH:
 379                         err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 380                                                                  true, extack);
 381                         if (err)
 382                                 return err;
 383                         break;
 384                 case RTM_DELNEIGH:
 385                         vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 386                                                            false, extack);
 387                         break;
 388                 }
 389         }
 390
 391         __vxlan_fdb_notify(vxlan, fdb, rd, type);
 392         return 0;
 393 }
 394
 395 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 396 {
 397         struct vxlan_dev *vxlan = netdev_priv(dev);
 398         struct vxlan_fdb f = {
 399                 .state = NUD_STALE,
 400         };
 401         struct vxlan_rdst remote = {
 402                 .remote_ip = *ipa, /* goes to NDA_DST */
 403                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 404         };
 405
 406         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 407 }
 408
 409 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 410 {
 411         struct vxlan_fdb f = {
 412                 .state = NUD_STALE,
 413         };
 414         struct vxlan_rdst remote = { };
 415
 416         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 417
 418         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 419 }
 420
 421 /* Hash Ethernet address */
 422 static u32 eth_hash(const unsigned char *addr)
 423 {
 424         u64 value = get_unaligned((u64 *)addr);
 425
 426         /* only want 6 bytes */
 427 #ifdef __BIG_ENDIAN
 428         value >>= 16;
 429 #else
 430         value <<= 16;
 431 #endif
 432         return hash_64(value, FDB_HASH_BITS);
 433 }
 434
 435 u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
 436 {
 437         /* use 1 byte of OUI and 3 bytes of NIC */
 438         u32 key = get_unaligned((u32 *)(addr + 2));
 439
 440         return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
 441 }
 442
 443 u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
 444 {
 445         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
 446                 return eth_vni_hash(mac, vni);
 447         else
 448                 return eth_hash(mac);
 449 }
 450
 451 /* Hash chain to use given mac address */
 452 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 453                                                 const u8 *mac, __be32 vni)
 454 {
 455         return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
 456 }
 457
 458 /* Look up Ethernet address in forwarding table */
 459 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 460                                           const u8 *mac, __be32 vni)
 461 {
 462         struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
 463         struct vxlan_fdb *f;
 464
 465         hlist_for_each_entry_rcu(f, head, hlist) {
 466                 if (ether_addr_equal(mac, f->eth_addr)) {
 467                         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
 468                                 if (vni == f->vni)
 469                                         return f;
 470                         } else {
 471                                 return f;
 472                         }
 473                 }
 474         }
 475
 476         return NULL;
 477 }
 478
 479 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 480                                         const u8 *mac, __be32 vni)
 481 {
 482         struct vxlan_fdb *f;
 483
 484         f = __vxlan_find_mac(vxlan, mac, vni);
 485         if (f && f->used != jiffies)
 486                 f->used = jiffies;
 487
 488         return f;
 489 }
 490
 491 /* caller should hold vxlan->hash_lock */
 492 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 493                                               union vxlan_addr *ip, __be16 port,
 494                                               __be32 vni, __u32 ifindex)
 495 {
 496         struct vxlan_rdst *rd;
 497
 498         list_for_each_entry(rd, &f->remotes, list) {
 499                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 500                     rd->remote_port == port &&
 501                     rd->remote_vni == vni &&
 502                     rd->remote_ifindex == ifindex)
 503                         return rd;
 504         }
 505
 506         return NULL;
 507 }
 508
 509 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
 510                       struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 511 {
 512         struct vxlan_dev *vxlan = netdev_priv(dev);
 513         u8 eth_addr[ETH_ALEN + 2] = { 0 };
 514         struct vxlan_rdst *rdst;
 515         struct vxlan_fdb *f;
 516         int rc = 0;
 517
 518         if (is_multicast_ether_addr(mac) ||
 519             is_zero_ether_addr(mac))
 520                 return -EINVAL;
 521
 522         ether_addr_copy(eth_addr, mac);
 523
 524         rcu_read_lock();
 525
 526         f = __vxlan_find_mac(vxlan, eth_addr, vni);
 527         if (!f) {
 528                 rc = -ENOENT;
 529                 goto out;
 530         }
 531
 532         rdst = first_remote_rcu(f);
 533         vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
 534
 535 out:
 536         rcu_read_unlock();
 537         return rc;
 538 }
 539 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
 540
 541 static int vxlan_fdb_notify_one(struct notifier_block *nb,
 542                                 const struct vxlan_dev *vxlan,
 543                                 const struct vxlan_fdb *f,
 544                                 const struct vxlan_rdst *rdst,
 545                                 struct netlink_ext_ack *extack)
 546 {
 547         struct switchdev_notifier_vxlan_fdb_info fdb_info;
 548         int rc;
 549
 550         vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
 551         rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
 552                                &fdb_info);
 553         return notifier_to_errno(rc);
 554 }
 555
 556 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
 557                      struct notifier_block *nb,
 558                      struct netlink_ext_ack *extack)
 559 {
 560         struct vxlan_dev *vxlan;
 561         struct vxlan_rdst *rdst;
 562         struct vxlan_fdb *f;
 563         unsigned int h;
 564         int rc = 0;
 565
 566         if (!netif_is_vxlan(dev))
 567                 return -EINVAL;
 568         vxlan = netdev_priv(dev);
 569
 570         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 571                 spin_lock_bh(&vxlan->hash_lock[h]);
 572                 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
 573                         if (f->vni == vni) {
 574                                 list_for_each_entry(rdst, &f->remotes, list) {
 575                                         rc = vxlan_fdb_notify_one(nb, vxlan,
 576                                                                   f, rdst,
 577                                                                   extack);
 578                                         if (rc)
 579                                                 goto unlock;
 580                                 }
 581                         }
 582                 }
 583                 spin_unlock_bh(&vxlan->hash_lock[h]);
 584         }
 585         return 0;
 586
 587 unlock:
 588         spin_unlock_bh(&vxlan->hash_lock[h]);
 589         return rc;
 590 }
 591 EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
 592
 593 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
 594 {
 595         struct vxlan_dev *vxlan;
 596         struct vxlan_rdst *rdst;
 597         struct vxlan_fdb *f;
 598         unsigned int h;
 599
 600         if (!netif_is_vxlan(dev))
 601                 return;
 602         vxlan = netdev_priv(dev);
 603
 604         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 605                 spin_lock_bh(&vxlan->hash_lock[h]);
 606                 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
 607                         if (f->vni == vni)
 608                                 list_for_each_entry(rdst, &f->remotes, list)
 609                                         rdst->offloaded = false;
 610                 spin_unlock_bh(&vxlan->hash_lock[h]);
 611         }
 612
 613 }
 614 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
 615
 616 /* Replace destination of unicast mac */
 617 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 618                              union vxlan_addr *ip, __be16 port, __be32 vni,
 619                              __u32 ifindex, struct vxlan_rdst *oldrd)
 620 {
 621         struct vxlan_rdst *rd;
 622
 623         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 624         if (rd)
 625                 return 0;
 626
 627         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 628         if (!rd)
 629                 return 0;
 630
 631         *oldrd = *rd;
 632         dst_cache_reset(&rd->dst_cache);
 633         rd->remote_ip = *ip;
 634         rd->remote_port = port;
 635         rd->remote_vni = vni;
 636         rd->remote_ifindex = ifindex;
 637         rd->offloaded = false;
 638         return 1;
 639 }
 640
 641 /* Add/update destinations for multicast */
 642 static int vxlan_fdb_append(struct vxlan_fdb *f,
 643                             union vxlan_addr *ip, __be16 port, __be32 vni,
 644                             __u32 ifindex, struct vxlan_rdst **rdp)
 645 {
 646         struct vxlan_rdst *rd;
 647
 648         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 649         if (rd)
 650                 return 0;
 651
 652         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 653         if (rd == NULL)
 654                 return -ENOMEM;
 655
 656         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 657                 kfree(rd);
 658                 return -ENOMEM;
 659         }
 660
 661         rd->remote_ip = *ip;
 662         rd->remote_port = port;
 663         rd->offloaded = false;
 664         rd->remote_vni = vni;
 665         rd->remote_ifindex = ifindex;
 666
 667         list_add_tail_rcu(&rd->list, &f->remotes);
 668
 669         *rdp = rd;
 670         return 1;
 671 }
 672
 673 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 674                                           unsigned int off,
 675                                           struct vxlanhdr *vh, size_t hdrlen,
 676                                           __be32 vni_field,
 677                                           struct gro_remcsum *grc,
 678                                           bool nopartial)
 679 {
 680         size_t start, offset;
 681
 682         if (skb->remcsum_offload)
 683                 return vh;
 684
 685         if (!NAPI_GRO_CB(skb)->csum_valid)
 686                 return NULL;
 687
 688         start = vxlan_rco_start(vni_field);
 689         offset = start + vxlan_rco_offset(vni_field);
 690
 691         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 692                                      start, offset, grc, nopartial);
 693
 694         skb->remcsum_offload = 1;
 695
 696         return vh;
 697 }
 698
 699 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
 700                                          struct list_head *head,
 701                                          struct sk_buff *skb)
 702 {
 703         struct sk_buff *pp = NULL;
 704         struct sk_buff *p;
 705         struct vxlanhdr *vh, *vh2;
 706         unsigned int hlen, off_vx;
 707         int flush = 1;
 708         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
 709         __be32 flags;
 710         struct gro_remcsum grc;
 711
 712         skb_gro_remcsum_init(&grc);
 713
 714         off_vx = skb_gro_offset(skb);
 715         hlen = off_vx + sizeof(*vh);
 716         vh   = skb_gro_header_fast(skb, off_vx);
 717         if (skb_gro_header_hard(skb, hlen)) {
 718                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 719                 if (unlikely(!vh))
 720                         goto out;
 721         }
 722
 723         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 724
 725         flags = vh->vx_flags;
 726
 727         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 728                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 729                                        vh->vx_vni, &grc,
 730                                        !!(vs->flags &
 731                                           VXLAN_F_REMCSUM_NOPARTIAL));
 732
 733                 if (!vh)
 734                         goto out;
 735         }
 736
 737         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 738
 739         list_for_each_entry(p, head, list) {
 740                 if (!NAPI_GRO_CB(p)->same_flow)
 741                         continue;
 742
 743                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 744                 if (vh->vx_flags != vh2->vx_flags ||
 745                     vh->vx_vni != vh2->vx_vni) {
 746                         NAPI_GRO_CB(p)->same_flow = 0;
 747                         continue;
 748                 }
 749         }
 750
 751         pp = call_gro_receive(eth_gro_receive, head, skb);
 752         flush = 0;
 753
 754 out:
 755         skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
 756
 757         return pp;
 758 }
 759
 760 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 761 {
 762         /* Sets 'skb->inner_mac_header' since we are always called with
 763          * 'skb->encapsulation' set.
 764          */
 765         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 766 }
 767
 768 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
 769                                          __u16 state, __be32 src_vni,
 770                                          __u16 ndm_flags)
 771 {
 772         struct vxlan_fdb *f;
 773
 774         f = kmalloc(sizeof(*f), GFP_ATOMIC);
 775         if (!f)
 776                 return NULL;
 777         f->state = state;
 778         f->flags = ndm_flags;
 779         f->updated = f->used = jiffies;
 780         f->vni = src_vni;
 781         f->nh = NULL;
 782         RCU_INIT_POINTER(f->vdev, vxlan);
 783         INIT_LIST_HEAD(&f->nh_list);
 784         INIT_LIST_HEAD(&f->remotes);
 785         memcpy(f->eth_addr, mac, ETH_ALEN);
 786
 787         return f;
 788 }
 789
 790 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
 791                              __be32 src_vni, struct vxlan_fdb *f)
 792 {
 793         ++vxlan->addrcnt;
 794         hlist_add_head_rcu(&f->hlist,
 795                            vxlan_fdb_head(vxlan, mac, src_vni));
 796 }
 797
 798 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 799                                u32 nhid, struct netlink_ext_ack *extack)
 800 {
 801         struct nexthop *old_nh = rtnl_dereference(fdb->nh);
 802         struct nexthop *nh;
 803         int err = -EINVAL;
 804
 805         if (old_nh && old_nh->id == nhid)
 806                 return 0;
 807
 808         nh = nexthop_find_by_id(vxlan->net, nhid);
 809         if (!nh) {
 810                 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
 811                 goto err_inval;
 812         }
 813
 814         if (!nexthop_get(nh)) {
 815                 NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
 816                 nh = NULL;
 817                 goto err_inval;
 818         }
 819         if (!nexthop_is_fdb(nh)) {
 820                 NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
 821                 goto err_inval;
 822         }
 823
 824         if (!nexthop_is_multipath(nh)) {
 825                 NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
 826                 goto err_inval;
 827         }
 828
 829         /* check nexthop group family */
 830         switch (vxlan->default_dst.remote_ip.sa.sa_family) {
 831         case AF_INET:
 832                 if (!nexthop_has_v4(nh)) {
 833                         err = -EAFNOSUPPORT;
 834                         NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
 835                         goto err_inval;
 836                 }
 837                 break;
 838         case AF_INET6:
 839                 if (nexthop_has_v4(nh)) {
 840                         err = -EAFNOSUPPORT;
 841                         NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
 842                         goto err_inval;
 843                 }
 844         }
 845
 846         if (old_nh) {
 847                 list_del_rcu(&fdb->nh_list);
 848                 nexthop_put(old_nh);
 849         }
 850         rcu_assign_pointer(fdb->nh, nh);
 851         list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
 852         return 1;
 853
 854 err_inval:
 855         if (nh)
 856                 nexthop_put(nh);
 857         return err;
 858 }
 859
 860 int vxlan_fdb_create(struct vxlan_dev *vxlan,
 861                      const u8 *mac, union vxlan_addr *ip,
 862                      __u16 state, __be16 port, __be32 src_vni,
 863                      __be32 vni, __u32 ifindex, __u16 ndm_flags,
 864                      u32 nhid, struct vxlan_fdb **fdb,
 865                      struct netlink_ext_ack *extack)
 866 {
 867         struct vxlan_rdst *rd = NULL;
 868         struct vxlan_fdb *f;
 869         int rc;
 870
 871         if (vxlan->cfg.addrmax &&
 872             vxlan->addrcnt >= vxlan->cfg.addrmax)
 873                 return -ENOSPC;
 874
 875         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 876         f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
 877         if (!f)
 878                 return -ENOMEM;
 879
 880         if (nhid)
 881                 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
 882         else
 883                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 884         if (rc < 0)
 885                 goto errout;
 886
 887         *fdb = f;
 888
 889         return 0;
 890
 891 errout:
 892         kfree(f);
 893         return rc;
 894 }
 895
 896 static void __vxlan_fdb_free(struct vxlan_fdb *f)
 897 {
 898         struct vxlan_rdst *rd, *nd;
 899         struct nexthop *nh;
 900
 901         nh = rcu_dereference_raw(f->nh);
 902         if (nh) {
 903                 rcu_assign_pointer(f->nh, NULL);
 904                 rcu_assign_pointer(f->vdev, NULL);
 905                 nexthop_put(nh);
 906         }
 907
 908         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 909                 dst_cache_destroy(&rd->dst_cache);
 910                 kfree(rd);
 911         }
 912         kfree(f);
 913 }
 914
 915 static void vxlan_fdb_free(struct rcu_head *head)
 916 {
 917         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 918
 919         __vxlan_fdb_free(f);
 920 }
 921
 922 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
 923                               bool do_notify, bool swdev_notify)
 924 {
 925         struct vxlan_rdst *rd;
 926
 927         netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
 928
 929         --vxlan->addrcnt;
 930         if (do_notify) {
 931                 if (rcu_access_pointer(f->nh))
 932                         vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
 933                                          swdev_notify, NULL);
 934                 else
 935                         list_for_each_entry(rd, &f->remotes, list)
 936                                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
 937                                                  swdev_notify, NULL);
 938         }
 939
 940         hlist_del_rcu(&f->hlist);
 941         list_del_rcu(&f->nh_list);
 942         call_rcu(&f->rcu, vxlan_fdb_free);
 943 }
 944
 945 static void vxlan_dst_free(struct rcu_head *head)
 946 {
 947         struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
 948
 949         dst_cache_destroy(&rd->dst_cache);
 950         kfree(rd);
 951 }
 952
 953 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
 954                                      union vxlan_addr *ip,
 955                                      __u16 state, __u16 flags,
 956                                      __be16 port, __be32 vni,
 957                                      __u32 ifindex, __u16 ndm_flags,
 958                                      struct vxlan_fdb *f, u32 nhid,
 959                                      bool swdev_notify,
 960                                      struct netlink_ext_ack *extack)
 961 {
 962         __u16 fdb_flags = (ndm_flags & ~NTF_USE);
 963         struct vxlan_rdst *rd = NULL;
 964         struct vxlan_rdst oldrd;
 965         int notify = 0;
 966         int rc = 0;
 967         int err;
 968
 969         if (nhid && !rcu_access_pointer(f->nh)) {
 970                 NL_SET_ERR_MSG(extack,
 971                                "Cannot replace an existing non nexthop fdb with a nexthop");
 972                 return -EOPNOTSUPP;
 973         }
 974
 975         if (nhid && (flags & NLM_F_APPEND)) {
 976                 NL_SET_ERR_MSG(extack,
 977                                "Cannot append to a nexthop fdb");
 978                 return -EOPNOTSUPP;
 979         }
 980
 981         /* Do not allow an externally learned entry to take over an entry added
 982          * by the user.
 983          */
 984         if (!(fdb_flags & NTF_EXT_LEARNED) ||
 985             !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
 986                 if (f->state != state) {
 987                         f->state = state;
 988                         f->updated = jiffies;
 989                         notify = 1;
 990                 }
 991                 if (f->flags != fdb_flags) {
 992                         f->flags = fdb_flags;
 993                         f->updated = jiffies;
 994                         notify = 1;
 995                 }
 996         }
 997
 998         if ((flags & NLM_F_REPLACE)) {
 999                 /* Only change unicasts */
1000                 if (!(is_multicast_ether_addr(f->eth_addr) ||
1001                       is_zero_ether_addr(f->eth_addr))) {
1002                         if (nhid) {
1003                                 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
1004                                 if (rc < 0)
1005                                         return rc;
1006                         } else {
1007                                 rc = vxlan_fdb_replace(f, ip, port, vni,
1008                                                        ifindex, &oldrd);
1009                         }
1010                         notify |= rc;
1011                 } else {
1012                         NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
1013                         return -EOPNOTSUPP;
1014                 }
1015         }
1016         if ((flags & NLM_F_APPEND) &&
1017             (is_multicast_ether_addr(f->eth_addr) ||
1018              is_zero_ether_addr(f->eth_addr))) {
1019                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
1020
1021                 if (rc < 0)
1022                         return rc;
1023                 notify |= rc;
1024         }
1025
1026         if (ndm_flags & NTF_USE)
1027                 f->used = jiffies;
1028
1029         if (notify) {
1030                 if (rd == NULL)
1031                         rd = first_remote_rtnl(f);
1032
1033                 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
1034                                        swdev_notify, extack);
1035                 if (err)
1036                         goto err_notify;
1037         }
1038
1039         return 0;
1040
1041 err_notify:
1042         if (nhid)
1043                 return err;
1044         if ((flags & NLM_F_REPLACE) && rc)
1045                 *rd = oldrd;
1046         else if ((flags & NLM_F_APPEND) && rc) {
1047                 list_del_rcu(&rd->list);
1048                 call_rcu(&rd->rcu, vxlan_dst_free);
1049         }
1050         return err;
1051 }
1052
1053 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
1054                                    const u8 *mac, union vxlan_addr *ip,
1055                                    __u16 state, __u16 flags,
1056                                    __be16 port, __be32 src_vni, __be32 vni,
1057                                    __u32 ifindex, __u16 ndm_flags, u32 nhid,
1058                                    bool swdev_notify,
1059                                    struct netlink_ext_ack *extack)
1060 {
1061         __u16 fdb_flags = (ndm_flags & ~NTF_USE);
1062         struct vxlan_fdb *f;
1063         int rc;
1064
1065         /* Disallow replace to add a multicast entry */
1066         if ((flags & NLM_F_REPLACE) &&
1067             (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
1068                 return -EOPNOTSUPP;
1069
1070         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
1071         rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
1072                               vni, ifindex, fdb_flags, nhid, &f, extack);
1073         if (rc < 0)
1074                 return rc;
1075
1076         vxlan_fdb_insert(vxlan, mac, src_vni, f);
1077         rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
1078                               swdev_notify, extack);
1079         if (rc)
1080                 goto err_notify;
1081
1082         return 0;
1083
1084 err_notify:
1085         vxlan_fdb_destroy(vxlan, f, false, false);
1086         return rc;
1087 }
1088
1089 /* Add new entry to forwarding table -- assumes lock held */
1090 int vxlan_fdb_update(struct vxlan_dev *vxlan,
1091                      const u8 *mac, union vxlan_addr *ip,
1092                      __u16 state, __u16 flags,
1093                      __be16 port, __be32 src_vni, __be32 vni,
1094                      __u32 ifindex, __u16 ndm_flags, u32 nhid,
1095                      bool swdev_notify,
1096                      struct netlink_ext_ack *extack)
1097 {
1098         struct vxlan_fdb *f;
1099
1100         f = __vxlan_find_mac(vxlan, mac, src_vni);
1101         if (f) {
1102                 if (flags & NLM_F_EXCL) {
1103                         netdev_dbg(vxlan->dev,
1104                                    "lost race to create %pM\n", mac);
1105                         return -EEXIST;
1106                 }
1107
1108                 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1109                                                  vni, ifindex, ndm_flags, f,
1110                                                  nhid, swdev_notify, extack);
1111         } else {
1112                 if (!(flags & NLM_F_CREATE))
1113                         return -ENOENT;
1114
1115                 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1116                                                port, src_vni, vni, ifindex,
1117                                                ndm_flags, nhid, swdev_notify,
1118                                                extack);
1119         }
1120 }
1121
1122 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1123                                   struct vxlan_rdst *rd, bool swdev_notify)
1124 {
1125         list_del_rcu(&rd->list);
1126         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1127         call_rcu(&rd->rcu, vxlan_dst_free);
1128 }
1129
1130 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1131                            union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1132                            __be32 *vni, u32 *ifindex, u32 *nhid)
1133 {
1134         struct net *net = dev_net(vxlan->dev);
1135         int err;
1136
1137         if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] ||
1138             tb[NDA_PORT]))
1139                 return -EINVAL;
1140
1141         if (tb[NDA_DST]) {
1142                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1143                 if (err)
1144                         return err;
1145         } else {
1146                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1147
1148                 if (remote->sa.sa_family == AF_INET) {
1149                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1150                         ip->sa.sa_family = AF_INET;
1151 #if IS_ENABLED(CONFIG_IPV6)
1152                 } else {
1153                         ip->sin6.sin6_addr = in6addr_any;
1154                         ip->sa.sa_family = AF_INET6;
1155 #endif
1156                 }
1157         }
1158
1159         if (tb[NDA_PORT]) {
1160                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
1161                         return -EINVAL;
1162                 *port = nla_get_be16(tb[NDA_PORT]);
1163         } else {
1164                 *port = vxlan->cfg.dst_port;
1165         }
1166
1167         if (tb[NDA_VNI]) {
1168                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
1169                         return -EINVAL;
1170                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1171         } else {
1172                 *vni = vxlan->default_dst.remote_vni;
1173         }
1174
1175         if (tb[NDA_SRC_VNI]) {
1176                 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
1177                         return -EINVAL;
1178                 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1179         } else {
1180                 *src_vni = vxlan->default_dst.remote_vni;
1181         }
1182
1183         if (tb[NDA_IFINDEX]) {
1184                 struct net_device *tdev;
1185
1186                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
1187                         return -EINVAL;
1188                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1189                 tdev = __dev_get_by_index(net, *ifindex);
1190                 if (!tdev)
1191                         return -EADDRNOTAVAIL;
1192         } else {
1193                 *ifindex = 0;
1194         }
1195
1196         if (tb[NDA_NH_ID])
1197                 *nhid = nla_get_u32(tb[NDA_NH_ID]);
1198         else
1199                 *nhid = 0;
1200
1201         return 0;
1202 }
1203
1204 /* Add static entry (via netlink) */
1205 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1206                          struct net_device *dev,
1207                          const unsigned char *addr, u16 vid, u16 flags,
1208                          struct netlink_ext_ack *extack)
1209 {
1210         struct vxlan_dev *vxlan = netdev_priv(dev);
1211         /* struct net *net = dev_net(vxlan->dev); */
1212         union vxlan_addr ip;
1213         __be16 port;
1214         __be32 src_vni, vni;
1215         u32 ifindex, nhid;
1216         u32 hash_index;
1217         int err;
1218
1219         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1220                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1221                         ndm->ndm_state);
1222                 return -EINVAL;
1223         }
1224
1225         if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
1226                 return -EINVAL;
1227
1228         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1229                               &nhid);
1230         if (err)
1231                 return err;
1232
1233         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1234                 return -EAFNOSUPPORT;
1235
1236         hash_index = fdb_head_index(vxlan, addr, src_vni);
1237         spin_lock_bh(&vxlan->hash_lock[hash_index]);
1238         err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1239                                port, src_vni, vni, ifindex,
1240                                ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1241                                nhid, true, extack);
1242         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1243
1244         return err;
1245 }
1246
1247 int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1248                        const unsigned char *addr, union vxlan_addr ip,
1249                        __be16 port, __be32 src_vni, __be32 vni,
1250                        u32 ifindex, bool swdev_notify)
1251 {
1252         struct vxlan_rdst *rd = NULL;
1253         struct vxlan_fdb *f;
1254         int err = -ENOENT;
1255
1256         f = vxlan_find_mac(vxlan, addr, src_vni);
1257         if (!f)
1258                 return err;
1259
1260         if (!vxlan_addr_any(&ip)) {
1261                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1262                 if (!rd)
1263                         goto out;
1264         }
1265
1266         /* remove a destination if it's not the only one on the list,
1267          * otherwise destroy the fdb entry
1268          */
1269         if (rd && !list_is_singular(&f->remotes)) {
1270                 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1271                 goto out;
1272         }
1273
1274         vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1275
1276 out:
1277         return 0;
1278 }
1279
1280 /* Delete entry (via netlink) */
1281 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1282                             struct net_device *dev,
1283                             const unsigned char *addr, u16 vid)
1284 {
1285         struct vxlan_dev *vxlan = netdev_priv(dev);
1286         union vxlan_addr ip;
1287         __be32 src_vni, vni;
1288         u32 ifindex, nhid;
1289         u32 hash_index;
1290         __be16 port;
1291         int err;
1292
1293         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1294                               &nhid);
1295         if (err)
1296                 return err;
1297
1298         hash_index = fdb_head_index(vxlan, addr, src_vni);
1299         spin_lock_bh(&vxlan->hash_lock[hash_index]);
1300         err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1301                                  true);
1302         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1303
1304         return err;
1305 }
1306
1307 /* Dump forwarding table */
1308 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1309                           struct net_device *dev,
1310                           struct net_device *filter_dev, int *idx)
1311 {
1312         struct vxlan_dev *vxlan = netdev_priv(dev);
1313         unsigned int h;
1314         int err = 0;
1315
1316         for (h = 0; h < FDB_HASH_SIZE; ++h) {
1317                 struct vxlan_fdb *f;
1318
1319                 rcu_read_lock();
1320                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1321                         struct vxlan_rdst *rd;
1322
1323                         if (rcu_access_pointer(f->nh)) {
1324                                 if (*idx < cb->args[2])
1325                                         goto skip_nh;
1326                                 err = vxlan_fdb_info(skb, vxlan, f,
1327                                                      NETLINK_CB(cb->skb).portid,
1328                                                      cb->nlh->nlmsg_seq,
1329                                                      RTM_NEWNEIGH,
1330                                                      NLM_F_MULTI, NULL);
1331                                 if (err < 0) {
1332                                         rcu_read_unlock();
1333                                         goto out;
1334                                 }
1335 skip_nh:
1336                                 *idx += 1;
1337                                 continue;
1338                         }
1339
1340                         list_for_each_entry_rcu(rd, &f->remotes, list) {
1341                                 if (*idx < cb->args[2])
1342                                         goto skip;
1343
1344                                 err = vxlan_fdb_info(skb, vxlan, f,
1345                                                      NETLINK_CB(cb->skb).portid,
1346                                                      cb->nlh->nlmsg_seq,
1347                                                      RTM_NEWNEIGH,
1348                                                      NLM_F_MULTI, rd);
1349                                 if (err < 0) {
1350                                         rcu_read_unlock();
1351                                         goto out;
1352                                 }
1353 skip:
1354                                 *idx += 1;
1355                         }
1356                 }
1357                 rcu_read_unlock();
1358         }
1359 out:
1360         return err;
1361 }
1362
1363 static int vxlan_fdb_get(struct sk_buff *skb,
1364                          struct nlattr *tb[],
1365                          struct net_device *dev,
1366                          const unsigned char *addr,
1367                          u16 vid, u32 portid, u32 seq,
1368                          struct netlink_ext_ack *extack)
1369 {
1370         struct vxlan_dev *vxlan = netdev_priv(dev);
1371         struct vxlan_fdb *f;
1372         __be32 vni;
1373         int err;
1374
1375         if (tb[NDA_VNI])
1376                 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1377         else
1378                 vni = vxlan->default_dst.remote_vni;
1379
1380         rcu_read_lock();
1381
1382         f = __vxlan_find_mac(vxlan, addr, vni);
1383         if (!f) {
1384                 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1385                 err = -ENOENT;
1386                 goto errout;
1387         }
1388
1389         err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1390                              RTM_NEWNEIGH, 0, first_remote_rcu(f));
1391 errout:
1392         rcu_read_unlock();
1393         return err;
1394 }
1395
1396 /* Watch incoming packets to learn mapping between Ethernet address
1397  * and Tunnel endpoint.
1398  * Return true if packet is bogus and should be dropped.
1399  */
1400 static bool vxlan_snoop(struct net_device *dev,
1401                         union vxlan_addr *src_ip, const u8 *src_mac,
1402                         u32 src_ifindex, __be32 vni)
1403 {
1404         struct vxlan_dev *vxlan = netdev_priv(dev);
1405         struct vxlan_fdb *f;
1406         u32 ifindex = 0;
1407
1408 #if IS_ENABLED(CONFIG_IPV6)
1409         if (src_ip->sa.sa_family == AF_INET6 &&
1410             (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1411                 ifindex = src_ifindex;
1412 #endif
1413
1414         f = vxlan_find_mac(vxlan, src_mac, vni);
1415         if (likely(f)) {
1416                 struct vxlan_rdst *rdst = first_remote_rcu(f);
1417
1418                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1419                            rdst->remote_ifindex == ifindex))
1420                         return false;
1421
1422                 /* Don't migrate static entries, drop packets */
1423                 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1424                         return true;
1425
1426                 /* Don't override an fdb with nexthop with a learnt entry */
1427                 if (rcu_access_pointer(f->nh))
1428                         return true;
1429
1430                 if (net_ratelimit())
1431                         netdev_info(dev,
1432                                     "%pM migrated from %pIS to %pIS\n",
1433                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1434
1435                 rdst->remote_ip = *src_ip;
1436                 f->updated = jiffies;
1437                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1438         } else {
1439                 u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
1440
1441                 /* learned new entry */
1442                 spin_lock(&vxlan->hash_lock[hash_index]);
1443
1444                 /* close off race between vxlan_flush and incoming packets */
1445                 if (netif_running(dev))
1446                         vxlan_fdb_update(vxlan, src_mac, src_ip,
1447                                          NUD_REACHABLE,
1448                                          NLM_F_EXCL|NLM_F_CREATE,
1449                                          vxlan->cfg.dst_port,
1450                                          vni,
1451                                          vxlan->default_dst.remote_vni,
1452                                          ifindex, NTF_SELF, 0, true, NULL);
1453                 spin_unlock(&vxlan->hash_lock[hash_index]);
1454         }
1455
1456         return false;
1457 }
1458
1459 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1460 {
1461         struct vxlan_net *vn;
1462
1463         if (!vs)
1464                 return false;
1465         if (!refcount_dec_and_test(&vs->refcnt))
1466                 return false;
1467
1468         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1469         spin_lock(&vn->sock_lock);
1470         hlist_del_rcu(&vs->hlist);
1471         udp_tunnel_notify_del_rx_port(vs->sock,
1472                                       (vs->flags & VXLAN_F_GPE) ?
1473                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
1474                                       UDP_TUNNEL_TYPE_VXLAN);
1475         spin_unlock(&vn->sock_lock);
1476
1477         return true;
1478 }
1479
1480 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1481 {
1482         struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1483 #if IS_ENABLED(CONFIG_IPV6)
1484         struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1485
1486         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1487 #endif
1488
1489         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1490         synchronize_net();
1491
1492         if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
1493                 vxlan_vs_del_vnigrp(vxlan);
1494         else
1495                 vxlan_vs_del_dev(vxlan);
1496
1497         if (__vxlan_sock_release_prep(sock4)) {
1498                 udp_tunnel_sock_release(sock4->sock);
1499                 kfree(sock4);
1500         }
1501
1502 #if IS_ENABLED(CONFIG_IPV6)
1503         if (__vxlan_sock_release_prep(sock6)) {
1504                 udp_tunnel_sock_release(sock6->sock);
1505                 kfree(sock6);
1506         }
1507 #endif
1508 }
1509
1510 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1511                           struct sk_buff *skb, u32 vxflags)
1512 {
1513         size_t start, offset;
1514
1515         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1516                 goto out;
1517
1518         start = vxlan_rco_start(unparsed->vx_vni);
1519         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1520
1521         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1522                 return false;
1523
1524         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1525                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1526 out:
1527         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1528         unparsed->vx_vni &= VXLAN_VNI_MASK;
1529         return true;
1530 }
1531
1532 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1533                                 struct sk_buff *skb, u32 vxflags,
1534                                 struct vxlan_metadata *md)
1535 {
1536         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1537         struct metadata_dst *tun_dst;
1538
1539         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1540                 goto out;
1541
1542         md->gbp = ntohs(gbp->policy_id);
1543
1544         tun_dst = (struct metadata_dst *)skb_dst(skb);
1545         if (tun_dst) {
1546                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1547                 tun_dst->u.tun_info.options_len = sizeof(*md);
1548         }
1549         if (gbp->dont_learn)
1550                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1551
1552         if (gbp->policy_applied)
1553                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1554
1555         /* In flow-based mode, GBP is carried in dst_metadata */
1556         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1557                 skb->mark = md->gbp;
1558 out:
1559         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1560 }
1561
1562 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1563                                 __be16 *protocol,
1564                                 struct sk_buff *skb, u32 vxflags)
1565 {
1566         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1567
1568         /* Need to have Next Protocol set for interfaces in GPE mode. */
1569         if (!gpe->np_applied)
1570                 return false;
1571         /* "The initial version is 0. If a receiver does not support the
1572          * version indicated it MUST drop the packet.
1573          */
1574         if (gpe->version != 0)
1575                 return false;
1576         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1577          * processing MUST occur." However, we don't implement OAM
1578          * processing, thus drop the packet.
1579          */
1580         if (gpe->oam_flag)
1581                 return false;
1582
1583         *protocol = tun_p_to_eth_p(gpe->next_protocol);
1584         if (!*protocol)
1585                 return false;
1586
1587         unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1588         return true;
1589 }
1590
1591 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1592                           struct vxlan_sock *vs,
1593                           struct sk_buff *skb, __be32 vni)
1594 {
1595         union vxlan_addr saddr;
1596         u32 ifindex = skb->dev->ifindex;
1597
1598         skb_reset_mac_header(skb);
1599         skb->protocol = eth_type_trans(skb, vxlan->dev);
1600         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1601
1602         /* Ignore packet loops (and multicast echo) */
1603         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1604                 return false;
1605
1606         /* Get address from the outer IP header */
1607         if (vxlan_get_sk_family(vs) == AF_INET) {
1608                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1609                 saddr.sa.sa_family = AF_INET;
1610 #if IS_ENABLED(CONFIG_IPV6)
1611         } else {
1612                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1613                 saddr.sa.sa_family = AF_INET6;
1614 #endif
1615         }
1616
1617         if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1618             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1619                 return false;
1620
1621         return true;
1622 }
1623
1624 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1625                                   struct sk_buff *skb)
1626 {
1627         int err = 0;
1628
1629         if (vxlan_get_sk_family(vs) == AF_INET)
1630                 err = IP_ECN_decapsulate(oiph, skb);
1631 #if IS_ENABLED(CONFIG_IPV6)
1632         else
1633                 err = IP6_ECN_decapsulate(oiph, skb);
1634 #endif
1635
1636         if (unlikely(err) && log_ecn_error) {
1637                 if (vxlan_get_sk_family(vs) == AF_INET)
1638                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1639                                              &((struct iphdr *)oiph)->saddr,
1640                                              ((struct iphdr *)oiph)->tos);
1641                 else
1642                         net_info_ratelimited("non-ECT from %pI6\n",
1643                                              &((struct ipv6hdr *)oiph)->saddr);
1644         }
1645         return err <= 1;
1646 }
1647
1648 /* Callback from net/ipv4/udp.c to receive packets */
1649 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1650 {
1651         struct vxlan_vni_node *vninode = NULL;
1652         struct vxlan_dev *vxlan;
1653         struct vxlan_sock *vs;
1654         struct vxlanhdr unparsed;
1655         struct vxlan_metadata _md;
1656         struct vxlan_metadata *md = &_md;
1657         __be16 protocol = htons(ETH_P_TEB);
1658         bool raw_proto = false;
1659         void *oiph;
1660         __be32 vni = 0;
1661
1662         /* Need UDP and VXLAN header to be present */
1663         if (!pskb_may_pull(skb, VXLAN_HLEN))
1664                 goto drop;
1665
1666         unparsed = *vxlan_hdr(skb);
1667         /* VNI flag always required to be set */
1668         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1669                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1670                            ntohl(vxlan_hdr(skb)->vx_flags),
1671                            ntohl(vxlan_hdr(skb)->vx_vni));
1672                 /* Return non vxlan pkt */
1673                 goto drop;
1674         }
1675         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1676         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1677
1678         vs = rcu_dereference_sk_user_data(sk);
1679         if (!vs)
1680                 goto drop;
1681
1682         vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1683
1684         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode);
1685         if (!vxlan)
1686                 goto drop;
1687
1688         /* For backwards compatibility, only allow reserved fields to be
1689          * used by VXLAN extensions if explicitly requested.
1690          */
1691         if (vs->flags & VXLAN_F_GPE) {
1692                 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1693                         goto drop;
1694                 raw_proto = true;
1695         }
1696
1697         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1698                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1699                 goto drop;
1700
1701         if (vs->flags & VXLAN_F_REMCSUM_RX)
1702                 if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags)))
1703                         goto drop;
1704
1705         if (vxlan_collect_metadata(vs)) {
1706                 struct metadata_dst *tun_dst;
1707
1708                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1709                                          key32_to_tunnel_id(vni), sizeof(*md));
1710
1711                 if (!tun_dst)
1712                         goto drop;
1713
1714                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1715
1716                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1717         } else {
1718                 memset(md, 0, sizeof(*md));
1719         }
1720
1721         if (vs->flags & VXLAN_F_GBP)
1722                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1723         /* Note that GBP and GPE can never be active together. This is
1724          * ensured in vxlan_dev_configure.
1725          */
1726
1727         if (unparsed.vx_flags || unparsed.vx_vni) {
1728                 /* If there are any unprocessed flags remaining treat
1729                  * this as a malformed packet. This behavior diverges from
1730                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1731                  * in reserved fields are to be ignored. The approach here
1732                  * maintains compatibility with previous stack code, and also
1733                  * is more robust and provides a little more security in
1734                  * adding extensions to VXLAN.
1735                  */
1736                 goto drop;
1737         }
1738
1739         if (!raw_proto) {
1740                 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1741                         goto drop;
1742         } else {
1743                 skb_reset_mac_header(skb);
1744                 skb->dev = vxlan->dev;
1745                 skb->pkt_type = PACKET_HOST;
1746         }
1747
1748         oiph = skb_network_header(skb);
1749         skb_reset_network_header(skb);
1750
1751         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1752                 ++vxlan->dev->stats.rx_frame_errors;
1753                 ++vxlan->dev->stats.rx_errors;
1754                 vxlan_vnifilter_count(vxlan, vni, vninode,
1755                                       VXLAN_VNI_STATS_RX_ERRORS, 0);
1756                 goto drop;
1757         }
1758
1759         rcu_read_lock();
1760
1761         if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1762                 rcu_read_unlock();
1763                 dev_core_stats_rx_dropped_inc(vxlan->dev);
1764                 vxlan_vnifilter_count(vxlan, vni, vninode,
1765                                       VXLAN_VNI_STATS_RX_DROPS, 0);
1766                 goto drop;
1767         }
1768
1769         dev_sw_netstats_rx_add(vxlan->dev, skb->len);
1770         vxlan_vnifilter_count(vxlan, vni, vninode, VXLAN_VNI_STATS_RX, skb->len);
1771         gro_cells_receive(&vxlan->gro_cells, skb);
1772
1773         rcu_read_unlock();
1774
1775         return 0;
1776
1777 drop:
1778         /* Consume bad packet */
1779         kfree_skb(skb);
1780         return 0;
1781 }
1782
1783 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1784 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1785 {
1786         struct vxlan_dev *vxlan;
1787         struct vxlan_sock *vs;
1788         struct vxlanhdr *hdr;
1789         __be32 vni;
1790
1791         if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1792                 return -EINVAL;
1793
1794         hdr = vxlan_hdr(skb);
1795
1796         if (!(hdr->vx_flags & VXLAN_HF_VNI))
1797                 return -EINVAL;
1798
1799         vs = rcu_dereference_sk_user_data(sk);
1800         if (!vs)
1801                 return -ENOENT;
1802
1803         vni = vxlan_vni(hdr->vx_vni);
1804         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, NULL);
1805         if (!vxlan)
1806                 return -ENOENT;
1807
1808         return 0;
1809 }
1810
1811 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1812 {
1813         struct vxlan_dev *vxlan = netdev_priv(dev);
1814         struct arphdr *parp;
1815         u8 *arpptr, *sha;
1816         __be32 sip, tip;
1817         struct neighbour *n;
1818
1819         if (dev->flags & IFF_NOARP)
1820                 goto out;
1821
1822         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1823                 dev->stats.tx_dropped++;
1824                 goto out;
1825         }
1826         parp = arp_hdr(skb);
1827
1828         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1829              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1830             parp->ar_pro != htons(ETH_P_IP) ||
1831             parp->ar_op != htons(ARPOP_REQUEST) ||
1832             parp->ar_hln != dev->addr_len ||
1833             parp->ar_pln != 4)
1834                 goto out;
1835         arpptr = (u8 *)parp + sizeof(struct arphdr);
1836         sha = arpptr;
1837         arpptr += dev->addr_len;        /* sha */
1838         memcpy(&sip, arpptr, sizeof(sip));
1839         arpptr += sizeof(sip);
1840         arpptr += dev->addr_len;        /* tha */
1841         memcpy(&tip, arpptr, sizeof(tip));
1842
1843         if (ipv4_is_loopback(tip) ||
1844             ipv4_is_multicast(tip))
1845                 goto out;
1846
1847         n = neigh_lookup(&arp_tbl, &tip, dev);
1848
1849         if (n) {
1850                 struct vxlan_fdb *f;
1851                 struct sk_buff  *reply;
1852
1853                 if (!(n->nud_state & NUD_CONNECTED)) {
1854                         neigh_release(n);
1855                         goto out;
1856                 }
1857
1858                 f = vxlan_find_mac(vxlan, n->ha, vni);
1859                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1860                         /* bridge-local neighbor */
1861                         neigh_release(n);
1862                         goto out;
1863                 }
1864
1865                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1866                                 n->ha, sha);
1867
1868                 neigh_release(n);
1869
1870                 if (reply == NULL)
1871                         goto out;
1872
1873                 skb_reset_mac_header(reply);
1874                 __skb_pull(reply, skb_network_offset(reply));
1875                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1876                 reply->pkt_type = PACKET_HOST;
1877
1878                 if (netif_rx(reply) == NET_RX_DROP) {
1879                         dev->stats.rx_dropped++;
1880                         vxlan_vnifilter_count(vxlan, vni, NULL,
1881                                               VXLAN_VNI_STATS_RX_DROPS, 0);
1882                 }
1883
1884         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1885                 union vxlan_addr ipa = {
1886                         .sin.sin_addr.s_addr = tip,
1887                         .sin.sin_family = AF_INET,
1888                 };
1889
1890                 vxlan_ip_miss(dev, &ipa);
1891         }
1892 out:
1893         consume_skb(skb);
1894         return NETDEV_TX_OK;
1895 }
1896
1897 #if IS_ENABLED(CONFIG_IPV6)
1898 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1899         struct neighbour *n, bool isrouter)
1900 {
1901         struct net_device *dev = request->dev;
1902         struct sk_buff *reply;
1903         struct nd_msg *ns, *na;
1904         struct ipv6hdr *pip6;
1905         u8 *daddr;
1906         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1907         int ns_olen;
1908         int i, len;
1909
1910         if (dev == NULL || !pskb_may_pull(request, request->len))
1911                 return NULL;
1912
1913         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1914                 sizeof(*na) + na_olen + dev->needed_tailroom;
1915         reply = alloc_skb(len, GFP_ATOMIC);
1916         if (reply == NULL)
1917                 return NULL;
1918
1919         reply->protocol = htons(ETH_P_IPV6);
1920         reply->dev = dev;
1921         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1922         skb_push(reply, sizeof(struct ethhdr));
1923         skb_reset_mac_header(reply);
1924
1925         ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1926
1927         daddr = eth_hdr(request)->h_source;
1928         ns_olen = request->len - skb_network_offset(request) -
1929                 sizeof(struct ipv6hdr) - sizeof(*ns);
1930         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1931                 if (!ns->opt[i + 1]) {
1932                         kfree_skb(reply);
1933                         return NULL;
1934                 }
1935                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1936                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1937                         break;
1938                 }
1939         }
1940
1941         /* Ethernet header */
1942         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1943         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1944         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1945         reply->protocol = htons(ETH_P_IPV6);
1946
1947         skb_pull(reply, sizeof(struct ethhdr));
1948         skb_reset_network_header(reply);
1949         skb_put(reply, sizeof(struct ipv6hdr));
1950
1951         /* IPv6 header */
1952
1953         pip6 = ipv6_hdr(reply);
1954         memset(pip6, 0, sizeof(struct ipv6hdr));
1955         pip6->version = 6;
1956         pip6->priority = ipv6_hdr(request)->priority;
1957         pip6->nexthdr = IPPROTO_ICMPV6;
1958         pip6->hop_limit = 255;
1959         pip6->daddr = ipv6_hdr(request)->saddr;
1960         pip6->saddr = *(struct in6_addr *)n->primary_key;
1961
1962         skb_pull(reply, sizeof(struct ipv6hdr));
1963         skb_reset_transport_header(reply);
1964
1965         /* Neighbor Advertisement */
1966         na = skb_put_zero(reply, sizeof(*na) + na_olen);
1967         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1968         na->icmph.icmp6_router = isrouter;
1969         na->icmph.icmp6_override = 1;
1970         na->icmph.icmp6_solicited = 1;
1971         na->target = ns->target;
1972         ether_addr_copy(&na->opt[2], n->ha);
1973         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1974         na->opt[1] = na_olen >> 3;
1975
1976         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1977                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1978                 csum_partial(na, sizeof(*na)+na_olen, 0));
1979
1980         pip6->payload_len = htons(sizeof(*na)+na_olen);
1981
1982         skb_push(reply, sizeof(struct ipv6hdr));
1983
1984         reply->ip_summed = CHECKSUM_UNNECESSARY;
1985
1986         return reply;
1987 }
1988
1989 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1990 {
1991         struct vxlan_dev *vxlan = netdev_priv(dev);
1992         const struct in6_addr *daddr;
1993         const struct ipv6hdr *iphdr;
1994         struct inet6_dev *in6_dev;
1995         struct neighbour *n;
1996         struct nd_msg *msg;
1997
1998         rcu_read_lock();
1999         in6_dev = __in6_dev_get(dev);
2000         if (!in6_dev)
2001                 goto out;
2002
2003         iphdr = ipv6_hdr(skb);
2004         daddr = &iphdr->daddr;
2005         msg = (struct nd_msg *)(iphdr + 1);
2006
2007         if (ipv6_addr_loopback(daddr) ||
2008             ipv6_addr_is_multicast(&msg->target))
2009                 goto out;
2010
2011         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
2012
2013         if (n) {
2014                 struct vxlan_fdb *f;
2015                 struct sk_buff *reply;
2016
2017                 if (!(n->nud_state & NUD_CONNECTED)) {
2018                         neigh_release(n);
2019                         goto out;
2020                 }
2021
2022                 f = vxlan_find_mac(vxlan, n->ha, vni);
2023                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2024                         /* bridge-local neighbor */
2025                         neigh_release(n);
2026                         goto out;
2027                 }
2028
2029                 reply = vxlan_na_create(skb, n,
2030                                         !!(f ? f->flags & NTF_ROUTER : 0));
2031
2032                 neigh_release(n);
2033
2034                 if (reply == NULL)
2035                         goto out;
2036
2037                 if (netif_rx(reply) == NET_RX_DROP) {
2038                         dev->stats.rx_dropped++;
2039                         vxlan_vnifilter_count(vxlan, vni, NULL,
2040                                               VXLAN_VNI_STATS_RX_DROPS, 0);
2041                 }
2042         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2043                 union vxlan_addr ipa = {
2044                         .sin6.sin6_addr = msg->target,
2045                         .sin6.sin6_family = AF_INET6,
2046                 };
2047
2048                 vxlan_ip_miss(dev, &ipa);
2049         }
2050
2051 out:
2052         rcu_read_unlock();
2053         consume_skb(skb);
2054         return NETDEV_TX_OK;
2055 }
2056 #endif
2057
2058 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2059 {
2060         struct vxlan_dev *vxlan = netdev_priv(dev);
2061         struct neighbour *n;
2062
2063         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2064                 return false;
2065
2066         n = NULL;
2067         switch (ntohs(eth_hdr(skb)->h_proto)) {
2068         case ETH_P_IP:
2069         {
2070                 struct iphdr *pip;
2071
2072                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2073                         return false;
2074                 pip = ip_hdr(skb);
2075                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2076                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2077                         union vxlan_addr ipa = {
2078                                 .sin.sin_addr.s_addr = pip->daddr,
2079                                 .sin.sin_family = AF_INET,
2080                         };
2081
2082                         vxlan_ip_miss(dev, &ipa);
2083                         return false;
2084                 }
2085
2086                 break;
2087         }
2088 #if IS_ENABLED(CONFIG_IPV6)
2089         case ETH_P_IPV6:
2090         {
2091                 struct ipv6hdr *pip6;
2092
2093                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2094                         return false;
2095                 pip6 = ipv6_hdr(skb);
2096                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2097                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2098                         union vxlan_addr ipa = {
2099                                 .sin6.sin6_addr = pip6->daddr,
2100                                 .sin6.sin6_family = AF_INET6,
2101                         };
2102
2103                         vxlan_ip_miss(dev, &ipa);
2104                         return false;
2105                 }
2106
2107                 break;
2108         }
2109 #endif
2110         default:
2111                 return false;
2112         }
2113
2114         if (n) {
2115                 bool diff;
2116
2117                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2118                 if (diff) {
2119                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2120                                 dev->addr_len);
2121                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2122                 }
2123                 neigh_release(n);
2124                 return diff;
2125         }
2126
2127         return false;
2128 }
2129
2130 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
2131                                 struct vxlan_metadata *md)
2132 {
2133         struct vxlanhdr_gbp *gbp;
2134
2135         if (!md->gbp)
2136                 return;
2137
2138         gbp = (struct vxlanhdr_gbp *)vxh;
2139         vxh->vx_flags |= VXLAN_HF_GBP;
2140
2141         if (md->gbp & VXLAN_GBP_DONT_LEARN)
2142                 gbp->dont_learn = 1;
2143
2144         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
2145                 gbp->policy_applied = 1;
2146
2147         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
2148 }
2149
2150 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
2151                                __be16 protocol)
2152 {
2153         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2154
2155         gpe->np_applied = 1;
2156         gpe->next_protocol = tun_p_from_eth_p(protocol);
2157         if (!gpe->next_protocol)
2158                 return -EPFNOSUPPORT;
2159         return 0;
2160 }
2161
2162 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2163                            int iphdr_len, __be32 vni,
2164                            struct vxlan_metadata *md, u32 vxflags,
2165                            bool udp_sum)
2166 {
2167         struct vxlanhdr *vxh;
2168         int min_headroom;
2169         int err;
2170         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2171         __be16 inner_protocol = htons(ETH_P_TEB);
2172
2173         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2174             skb->ip_summed == CHECKSUM_PARTIAL) {
2175                 int csum_start = skb_checksum_start_offset(skb);
2176
2177                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2178                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2179                     (skb->csum_offset == offsetof(struct udphdr, check) ||
2180                      skb->csum_offset == offsetof(struct tcphdr, check)))
2181                         type |= SKB_GSO_TUNNEL_REMCSUM;
2182         }
2183
2184         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2185                         + VXLAN_HLEN + iphdr_len;
2186
2187         /* Need space for new headers (invalidates iph ptr) */
2188         err = skb_cow_head(skb, min_headroom);
2189         if (unlikely(err))
2190                 return err;
2191
2192         err = iptunnel_handle_offloads(skb, type);
2193         if (err)
2194                 return err;
2195
2196         vxh = __skb_push(skb, sizeof(*vxh));
2197         vxh->vx_flags = VXLAN_HF_VNI;
2198         vxh->vx_vni = vxlan_vni_field(vni);
2199
2200         if (type & SKB_GSO_TUNNEL_REMCSUM) {
2201                 unsigned int start;
2202
2203                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2204                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2205                 vxh->vx_flags |= VXLAN_HF_RCO;
2206
2207                 if (!skb_is_gso(skb)) {
2208                         skb->ip_summed = CHECKSUM_NONE;
2209                         skb->encapsulation = 0;
2210                 }
2211         }
2212
2213         if (vxflags & VXLAN_F_GBP)
2214                 vxlan_build_gbp_hdr(vxh, vxflags, md);
2215         if (vxflags & VXLAN_F_GPE) {
2216                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
2217                 if (err < 0)
2218                         return err;
2219                 inner_protocol = skb->protocol;
2220         }
2221
2222         skb_set_inner_protocol(skb, inner_protocol);
2223         return 0;
2224 }
2225
2226 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2227                                       struct vxlan_sock *sock4,
2228                                       struct sk_buff *skb, int oif, u8 tos,
2229                                       __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2230                                       struct dst_cache *dst_cache,
2231                                       const struct ip_tunnel_info *info)
2232 {
2233         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2234         struct rtable *rt = NULL;
2235         struct flowi4 fl4;
2236
2237         if (!sock4)
2238                 return ERR_PTR(-EIO);
2239
2240         if (tos && !info)
2241                 use_cache = false;
2242         if (use_cache) {
2243                 rt = dst_cache_get_ip4(dst_cache, saddr);
2244                 if (rt)
2245                         return rt;
2246         }
2247
2248         memset(&fl4, 0, sizeof(fl4));
2249         fl4.flowi4_oif = oif;
2250         fl4.flowi4_tos = RT_TOS(tos);
2251         fl4.flowi4_mark = skb->mark;
2252         fl4.flowi4_proto = IPPROTO_UDP;
2253         fl4.daddr = daddr;
2254         fl4.saddr = *saddr;
2255         fl4.fl4_dport = dport;
2256         fl4.fl4_sport = sport;
2257
2258         rt = ip_route_output_key(vxlan->net, &fl4);
2259         if (!IS_ERR(rt)) {
2260                 if (rt->dst.dev == dev) {
2261                         netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2262                         ip_rt_put(rt);
2263                         return ERR_PTR(-ELOOP);
2264                 }
2265
2266                 *saddr = fl4.saddr;
2267                 if (use_cache)
2268                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2269         } else {
2270                 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2271                 return ERR_PTR(-ENETUNREACH);
2272         }
2273         return rt;
2274 }
2275
2276 #if IS_ENABLED(CONFIG_IPV6)
2277 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2278                                           struct net_device *dev,
2279                                           struct vxlan_sock *sock6,
2280                                           struct sk_buff *skb, int oif, u8 tos,
2281                                           __be32 label,
2282                                           const struct in6_addr *daddr,
2283                                           struct in6_addr *saddr,
2284                                           __be16 dport, __be16 sport,
2285                                           struct dst_cache *dst_cache,
2286                                           const struct ip_tunnel_info *info)
2287 {
2288         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2289         struct dst_entry *ndst;
2290         struct flowi6 fl6;
2291
2292         if (!sock6)
2293                 return ERR_PTR(-EIO);
2294
2295         if (tos && !info)
2296                 use_cache = false;
2297         if (use_cache) {
2298                 ndst = dst_cache_get_ip6(dst_cache, saddr);
2299                 if (ndst)
2300                         return ndst;
2301         }
2302
2303         memset(&fl6, 0, sizeof(fl6));
2304         fl6.flowi6_oif = oif;
2305         fl6.daddr = *daddr;
2306         fl6.saddr = *saddr;
2307         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2308         fl6.flowi6_mark = skb->mark;
2309         fl6.flowi6_proto = IPPROTO_UDP;
2310         fl6.fl6_dport = dport;
2311         fl6.fl6_sport = sport;
2312
2313         ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
2314                                                &fl6, NULL);
2315         if (IS_ERR(ndst)) {
2316                 netdev_dbg(dev, "no route to %pI6\n", daddr);
2317                 return ERR_PTR(-ENETUNREACH);
2318         }
2319
2320         if (unlikely(ndst->dev == dev)) {
2321                 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2322                 dst_release(ndst);
2323                 return ERR_PTR(-ELOOP);
2324         }
2325
2326         *saddr = fl6.saddr;
2327         if (use_cache)
2328                 dst_cache_set_ip6(dst_cache, ndst, saddr);
2329         return ndst;
2330 }
2331 #endif
2332
2333 /* Bypass encapsulation if the destination is local */
2334 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2335                                struct vxlan_dev *dst_vxlan, __be32 vni,
2336                                bool snoop)
2337 {
2338         struct pcpu_sw_netstats *tx_stats, *rx_stats;
2339         union vxlan_addr loopback;
2340         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2341         struct net_device *dev;
2342         int len = skb->len;
2343
2344         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2345         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2346         skb->pkt_type = PACKET_HOST;
2347         skb->encapsulation = 0;
2348         skb->dev = dst_vxlan->dev;
2349         __skb_pull(skb, skb_network_offset(skb));
2350
2351         if (remote_ip->sa.sa_family == AF_INET) {
2352                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2353                 loopback.sa.sa_family =  AF_INET;
2354 #if IS_ENABLED(CONFIG_IPV6)
2355         } else {
2356                 loopback.sin6.sin6_addr = in6addr_loopback;
2357                 loopback.sa.sa_family =  AF_INET6;
2358 #endif
2359         }
2360
2361         rcu_read_lock();
2362         dev = skb->dev;
2363         if (unlikely(!(dev->flags & IFF_UP))) {
2364                 kfree_skb(skb);
2365                 goto drop;
2366         }
2367
2368         if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop)
2369                 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2370
2371         u64_stats_update_begin(&tx_stats->syncp);
2372         tx_stats->tx_packets++;
2373         tx_stats->tx_bytes += len;
2374         u64_stats_update_end(&tx_stats->syncp);
2375         vxlan_vnifilter_count(src_vxlan, vni, NULL, VXLAN_VNI_STATS_TX, len);
2376
2377         if (__netif_rx(skb) == NET_RX_SUCCESS) {
2378                 u64_stats_update_begin(&rx_stats->syncp);
2379                 rx_stats->rx_packets++;
2380                 rx_stats->rx_bytes += len;
2381                 u64_stats_update_end(&rx_stats->syncp);
2382                 vxlan_vnifilter_count(dst_vxlan, vni, NULL, VXLAN_VNI_STATS_RX,
2383                                       len);
2384         } else {
2385 drop:
2386                 dev->stats.rx_dropped++;
2387                 vxlan_vnifilter_count(dst_vxlan, vni, NULL,
2388                                       VXLAN_VNI_STATS_RX_DROPS, 0);
2389         }
2390         rcu_read_unlock();
2391 }
2392
2393 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2394                                  struct vxlan_dev *vxlan,
2395                                  union vxlan_addr *daddr,
2396                                  __be16 dst_port, int dst_ifindex, __be32 vni,
2397                                  struct dst_entry *dst,
2398                                  u32 rt_flags)
2399 {
2400 #if IS_ENABLED(CONFIG_IPV6)
2401         /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2402          * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2403          * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2404          */
2405         BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2406 #endif
2407         /* Bypass encapsulation if the destination is local */
2408         if (rt_flags & RTCF_LOCAL &&
2409             !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2410                 struct vxlan_dev *dst_vxlan;
2411
2412                 dst_release(dst);
2413                 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2414                                            daddr->sa.sa_family, dst_port,
2415                                            vxlan->cfg.flags);
2416                 if (!dst_vxlan) {
2417                         dev->stats.tx_errors++;
2418                         vxlan_vnifilter_count(vxlan, vni, NULL,
2419                                               VXLAN_VNI_STATS_TX_ERRORS, 0);
2420                         kfree_skb(skb);
2421
2422                         return -ENOENT;
2423                 }
2424                 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
2425                 return 1;
2426         }
2427
2428         return 0;
2429 }
2430
2431 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2432                            __be32 default_vni, struct vxlan_rdst *rdst,
2433                            bool did_rsc)
2434 {
2435         struct dst_cache *dst_cache;
2436         struct ip_tunnel_info *info;
2437         struct vxlan_dev *vxlan = netdev_priv(dev);
2438         const struct iphdr *old_iph = ip_hdr(skb);
2439         union vxlan_addr *dst;
2440         union vxlan_addr remote_ip, local_ip;
2441         struct vxlan_metadata _md;
2442         struct vxlan_metadata *md = &_md;
2443         unsigned int pkt_len = skb->len;
2444         __be16 src_port = 0, dst_port;
2445         struct dst_entry *ndst = NULL;
2446         __u8 tos, ttl;
2447         int ifindex;
2448         int err;
2449         u32 flags = vxlan->cfg.flags;
2450         bool udp_sum = false;
2451         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2452         __be32 vni = 0;
2453 #if IS_ENABLED(CONFIG_IPV6)
2454         __be32 label;
2455 #endif
2456
2457         info = skb_tunnel_info(skb);
2458
2459         if (rdst) {
2460                 dst = &rdst->remote_ip;
2461                 if (vxlan_addr_any(dst)) {
2462                         if (did_rsc) {
2463                                 /* short-circuited back to local bridge */
2464                                 vxlan_encap_bypass(skb, vxlan, vxlan,
2465                                                    default_vni, true);
2466                                 return;
2467                         }
2468                         goto drop;
2469                 }
2470
2471                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2472                 vni = (rdst->remote_vni) ? : default_vni;
2473                 ifindex = rdst->remote_ifindex;
2474                 local_ip = vxlan->cfg.saddr;
2475                 dst_cache = &rdst->dst_cache;
2476                 md->gbp = skb->mark;
2477                 if (flags & VXLAN_F_TTL_INHERIT) {
2478                         ttl = ip_tunnel_get_ttl(old_iph, skb);
2479                 } else {
2480                         ttl = vxlan->cfg.ttl;
2481                         if (!ttl && vxlan_addr_multicast(dst))
2482                                 ttl = 1;
2483                 }
2484
2485                 tos = vxlan->cfg.tos;
2486                 if (tos == 1)
2487                         tos = ip_tunnel_get_dsfield(old_iph, skb);
2488
2489                 if (dst->sa.sa_family == AF_INET)
2490                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2491                 else
2492                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2493 #if IS_ENABLED(CONFIG_IPV6)
2494                 label = vxlan->cfg.label;
2495 #endif
2496         } else {
2497                 if (!info) {
2498                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2499                                   dev->name);
2500                         goto drop;
2501                 }
2502                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2503                 if (remote_ip.sa.sa_family == AF_INET) {
2504                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2505                         local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2506                 } else {
2507                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2508                         local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2509                 }
2510                 dst = &remote_ip;
2511                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2512                 vni = tunnel_id_to_key32(info->key.tun_id);
2513                 ifindex = 0;
2514                 dst_cache = &info->dst_cache;
2515                 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
2516                         if (info->options_len < sizeof(*md))
2517                                 goto drop;
2518                         md = ip_tunnel_info_opts(info);
2519                 }
2520                 ttl = info->key.ttl;
2521                 tos = info->key.tos;
2522 #if IS_ENABLED(CONFIG_IPV6)
2523                 label = info->key.label;
2524 #endif
2525                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2526         }
2527         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2528                                      vxlan->cfg.port_max, true);
2529
2530         rcu_read_lock();
2531         if (dst->sa.sa_family == AF_INET) {
2532                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2533                 struct rtable *rt;
2534                 __be16 df = 0;
2535
2536                 if (!ifindex)
2537                         ifindex = sock4->sock->sk->sk_bound_dev_if;
2538
2539                 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2540                                      dst->sin.sin_addr.s_addr,
2541                                      &local_ip.sin.sin_addr.s_addr,
2542                                      dst_port, src_port,
2543                                      dst_cache, info);
2544                 if (IS_ERR(rt)) {
2545                         err = PTR_ERR(rt);
2546                         goto tx_error;
2547                 }
2548
2549                 if (!info) {
2550                         /* Bypass encapsulation if the destination is local */
2551                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2552                                                     dst_port, ifindex, vni,
2553                                                     &rt->dst, rt->rt_flags);
2554                         if (err)
2555                                 goto out_unlock;
2556
2557                         if (vxlan->cfg.df == VXLAN_DF_SET) {
2558                                 df = htons(IP_DF);
2559                         } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2560                                 struct ethhdr *eth = eth_hdr(skb);
2561
2562                                 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2563                                     (ntohs(eth->h_proto) == ETH_P_IP &&
2564                                      old_iph->frag_off & htons(IP_DF)))
2565                                         df = htons(IP_DF);
2566                         }
2567                 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2568                         df = htons(IP_DF);
2569                 }
2570
2571                 ndst = &rt->dst;
2572                 err = skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM,
2573                                             netif_is_any_bridge_port(dev));
2574                 if (err < 0) {
2575                         goto tx_error;
2576                 } else if (err) {
2577                         if (info) {
2578                                 struct ip_tunnel_info *unclone;
2579                                 struct in_addr src, dst;
2580
2581                                 unclone = skb_tunnel_info_unclone(skb);
2582                                 if (unlikely(!unclone))
2583                                         goto tx_error;
2584
2585                                 src = remote_ip.sin.sin_addr;
2586                                 dst = local_ip.sin.sin_addr;
2587                                 unclone->key.u.ipv4.src = src.s_addr;
2588                                 unclone->key.u.ipv4.dst = dst.s_addr;
2589                         }
2590                         vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2591                         dst_release(ndst);
2592                         goto out_unlock;
2593                 }
2594
2595                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2596                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2597                 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2598                                       vni, md, flags, udp_sum);
2599                 if (err < 0)
2600                         goto tx_error;
2601
2602                 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2603                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2604                                     src_port, dst_port, xnet, !udp_sum);
2605 #if IS_ENABLED(CONFIG_IPV6)
2606         } else {
2607                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2608
2609                 if (!ifindex)
2610                         ifindex = sock6->sock->sk->sk_bound_dev_if;
2611
2612                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2613                                         label, &dst->sin6.sin6_addr,
2614                                         &local_ip.sin6.sin6_addr,
2615                                         dst_port, src_port,
2616                                         dst_cache, info);
2617                 if (IS_ERR(ndst)) {
2618                         err = PTR_ERR(ndst);
2619                         ndst = NULL;
2620                         goto tx_error;
2621                 }
2622
2623                 if (!info) {
2624                         u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2625
2626                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2627                                                     dst_port, ifindex, vni,
2628                                                     ndst, rt6i_flags);
2629                         if (err)
2630                                 goto out_unlock;
2631                 }
2632
2633                 err = skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM,
2634                                             netif_is_any_bridge_port(dev));
2635                 if (err < 0) {
2636                         goto tx_error;
2637                 } else if (err) {
2638                         if (info) {
2639                                 struct ip_tunnel_info *unclone;
2640                                 struct in6_addr src, dst;
2641
2642                                 unclone = skb_tunnel_info_unclone(skb);
2643                                 if (unlikely(!unclone))
2644                                         goto tx_error;
2645
2646                                 src = remote_ip.sin6.sin6_addr;
2647                                 dst = local_ip.sin6.sin6_addr;
2648                                 unclone->key.u.ipv6.src = src;
2649                                 unclone->key.u.ipv6.dst = dst;
2650                         }
2651
2652                         vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2653                         dst_release(ndst);
2654                         goto out_unlock;
2655                 }
2656
2657                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2658                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2659                 skb_scrub_packet(skb, xnet);
2660                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2661                                       vni, md, flags, udp_sum);
2662                 if (err < 0)
2663                         goto tx_error;
2664
2665                 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2666                                      &local_ip.sin6.sin6_addr,
2667                                      &dst->sin6.sin6_addr, tos, ttl,
2668                                      label, src_port, dst_port, !udp_sum);
2669 #endif
2670         }
2671         vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX, pkt_len);
2672 out_unlock:
2673         rcu_read_unlock();
2674         return;
2675
2676 drop:
2677         dev->stats.tx_dropped++;
2678         vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0);
2679         dev_kfree_skb(skb);
2680         return;
2681
2682 tx_error:
2683         rcu_read_unlock();
2684         if (err == -ELOOP)
2685                 dev->stats.collisions++;
2686         else if (err == -ENETUNREACH)
2687                 dev->stats.tx_carrier_errors++;
2688         dst_release(ndst);
2689         dev->stats.tx_errors++;
2690         vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0);
2691         kfree_skb(skb);
2692 }
2693
2694 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
2695                           struct vxlan_fdb *f, __be32 vni, bool did_rsc)
2696 {
2697         struct vxlan_rdst nh_rdst;
2698         struct nexthop *nh;
2699         bool do_xmit;
2700         u32 hash;
2701
2702         memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
2703         hash = skb_get_hash(skb);
2704
2705         rcu_read_lock();
2706         nh = rcu_dereference(f->nh);
2707         if (!nh) {
2708                 rcu_read_unlock();
2709                 goto drop;
2710         }
2711         do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
2712         rcu_read_unlock();
2713
2714         if (likely(do_xmit))
2715                 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
2716         else
2717                 goto drop;
2718
2719         return;
2720
2721 drop:
2722         dev->stats.tx_dropped++;
2723         vxlan_vnifilter_count(netdev_priv(dev), vni, NULL,
2724                               VXLAN_VNI_STATS_TX_DROPS, 0);
2725         dev_kfree_skb(skb);
2726 }
2727
2728 /* Transmit local packets over Vxlan
2729  *
2730  * Outer IP header inherits ECN and DF from inner header.
2731  * Outer UDP destination is the VXLAN assigned port.
2732  *           source port is based on hash of flow
2733  */
2734 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2735 {
2736         struct vxlan_dev *vxlan = netdev_priv(dev);
2737         struct vxlan_rdst *rdst, *fdst = NULL;
2738         const struct ip_tunnel_info *info;
2739         bool did_rsc = false;
2740         struct vxlan_fdb *f;
2741         struct ethhdr *eth;
2742         __be32 vni = 0;
2743
2744         info = skb_tunnel_info(skb);
2745
2746         skb_reset_mac_header(skb);
2747
2748         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2749                 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2750                     info->mode & IP_TUNNEL_INFO_TX) {
2751                         vni = tunnel_id_to_key32(info->key.tun_id);
2752                 } else {
2753                         if (info && info->mode & IP_TUNNEL_INFO_TX)
2754                                 vxlan_xmit_one(skb, dev, vni, NULL, false);
2755                         else
2756                                 kfree_skb(skb);
2757                         return NETDEV_TX_OK;
2758                 }
2759         }
2760
2761         if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2762                 eth = eth_hdr(skb);
2763                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2764                         return arp_reduce(dev, skb, vni);
2765 #if IS_ENABLED(CONFIG_IPV6)
2766                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2767                          pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2768                                             sizeof(struct nd_msg)) &&
2769                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2770                         struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2771
2772                         if (m->icmph.icmp6_code == 0 &&
2773                             m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2774                                 return neigh_reduce(dev, skb, vni);
2775                 }
2776 #endif
2777         }
2778
2779         eth = eth_hdr(skb);
2780         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2781         did_rsc = false;
2782
2783         if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2784             (ntohs(eth->h_proto) == ETH_P_IP ||
2785              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2786                 did_rsc = route_shortcircuit(dev, skb);
2787                 if (did_rsc)
2788                         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2789         }
2790
2791         if (f == NULL) {
2792                 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2793                 if (f == NULL) {
2794                         if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2795                             !is_multicast_ether_addr(eth->h_dest))
2796                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2797
2798                         dev->stats.tx_dropped++;
2799                         vxlan_vnifilter_count(vxlan, vni, NULL,
2800                                               VXLAN_VNI_STATS_TX_DROPS, 0);
2801                         kfree_skb(skb);
2802                         return NETDEV_TX_OK;
2803                 }
2804         }
2805
2806         if (rcu_access_pointer(f->nh)) {
2807                 vxlan_xmit_nh(skb, dev, f,
2808                               (vni ? : vxlan->default_dst.remote_vni), did_rsc);
2809         } else {
2810                 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2811                         struct sk_buff *skb1;
2812
2813                         if (!fdst) {
2814                                 fdst = rdst;
2815                                 continue;
2816                         }
2817                         skb1 = skb_clone(skb, GFP_ATOMIC);
2818                         if (skb1)
2819                                 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2820                 }
2821                 if (fdst)
2822                         vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2823                 else
2824                         kfree_skb(skb);
2825         }
2826
2827         return NETDEV_TX_OK;
2828 }
2829
2830 /* Walk the forwarding table and purge stale entries */
2831 static void vxlan_cleanup(struct timer_list *t)
2832 {
2833         struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2834         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2835         unsigned int h;
2836
2837         if (!netif_running(vxlan->dev))
2838                 return;
2839
2840         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2841                 struct hlist_node *p, *n;
2842
2843                 spin_lock(&vxlan->hash_lock[h]);
2844                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2845                         struct vxlan_fdb *f
2846                                 = container_of(p, struct vxlan_fdb, hlist);
2847                         unsigned long timeout;
2848
2849                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2850                                 continue;
2851
2852                         if (f->flags & NTF_EXT_LEARNED)
2853                                 continue;
2854
2855                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2856                         if (time_before_eq(timeout, jiffies)) {
2857                                 netdev_dbg(vxlan->dev,
2858                                            "garbage collect %pM\n",
2859                                            f->eth_addr);
2860                                 f->state = NUD_STALE;
2861                                 vxlan_fdb_destroy(vxlan, f, true, true);
2862                         } else if (time_before(timeout, next_timer))
2863                                 next_timer = timeout;
2864                 }
2865                 spin_unlock(&vxlan->hash_lock[h]);
2866         }
2867
2868         mod_timer(&vxlan->age_timer, next_timer);
2869 }
2870
2871 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2872 {
2873         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2874
2875         spin_lock(&vn->sock_lock);
2876         hlist_del_init_rcu(&vxlan->hlist4.hlist);
2877 #if IS_ENABLED(CONFIG_IPV6)
2878         hlist_del_init_rcu(&vxlan->hlist6.hlist);
2879 #endif
2880         spin_unlock(&vn->sock_lock);
2881 }
2882
2883 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2884                              struct vxlan_dev_node *node)
2885 {
2886         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2887         __be32 vni = vxlan->default_dst.remote_vni;
2888
2889         node->vxlan = vxlan;
2890         spin_lock(&vn->sock_lock);
2891         hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2892         spin_unlock(&vn->sock_lock);
2893 }
2894
2895 /* Setup stats when device is created */
2896 static int vxlan_init(struct net_device *dev)
2897 {
2898         struct vxlan_dev *vxlan = netdev_priv(dev);
2899         int err;
2900
2901         if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
2902                 vxlan_vnigroup_init(vxlan);
2903
2904         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2905         if (!dev->tstats)
2906                 return -ENOMEM;
2907
2908         err = gro_cells_init(&vxlan->gro_cells, dev);
2909         if (err) {
2910                 free_percpu(dev->tstats);
2911                 return err;
2912         }
2913
2914         return 0;
2915 }
2916
2917 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2918 {
2919         struct vxlan_fdb *f;
2920         u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
2921
2922         spin_lock_bh(&vxlan->hash_lock[hash_index]);
2923         f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2924         if (f)
2925                 vxlan_fdb_destroy(vxlan, f, true, true);
2926         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
2927 }
2928
2929 static void vxlan_uninit(struct net_device *dev)
2930 {
2931         struct vxlan_dev *vxlan = netdev_priv(dev);
2932
2933         if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
2934                 vxlan_vnigroup_uninit(vxlan);
2935
2936         gro_cells_destroy(&vxlan->gro_cells);
2937
2938         vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2939
2940         free_percpu(dev->tstats);
2941 }
2942
2943 /* Start ageing timer and join group when device is brought up */
2944 static int vxlan_open(struct net_device *dev)
2945 {
2946         struct vxlan_dev *vxlan = netdev_priv(dev);
2947         int ret;
2948
2949         ret = vxlan_sock_add(vxlan);
2950         if (ret < 0)
2951                 return ret;
2952
2953         ret = vxlan_multicast_join(vxlan);
2954         if (ret) {
2955                 vxlan_sock_release(vxlan);
2956                 return ret;
2957         }
2958
2959         if (vxlan->cfg.age_interval)
2960                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2961
2962         return ret;
2963 }
2964
2965 /* Purge the forwarding table */
2966 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2967 {
2968         unsigned int h;
2969
2970         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2971                 struct hlist_node *p, *n;
2972
2973                 spin_lock_bh(&vxlan->hash_lock[h]);
2974                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2975                         struct vxlan_fdb *f
2976                                 = container_of(p, struct vxlan_fdb, hlist);
2977                         if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2978                                 continue;
2979                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2980                         if (is_zero_ether_addr(f->eth_addr) &&
2981                             f->vni == vxlan->cfg.vni)
2982                                 continue;
2983                         vxlan_fdb_destroy(vxlan, f, true, true);
2984                 }
2985                 spin_unlock_bh(&vxlan->hash_lock[h]);
2986         }
2987 }
2988
2989 /* Cleanup timer and forwarding table on shutdown */
2990 static int vxlan_stop(struct net_device *dev)
2991 {
2992         struct vxlan_dev *vxlan = netdev_priv(dev);
2993
2994         vxlan_multicast_leave(vxlan);
2995
2996         del_timer_sync(&vxlan->age_timer);
2997
2998         vxlan_flush(vxlan, false);
2999         vxlan_sock_release(vxlan);
3000
3001         return 0;
3002 }
3003
3004 /* Stub, nothing needs to be done. */
3005 static void vxlan_set_multicast_list(struct net_device *dev)
3006 {
3007 }
3008
3009 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
3010 {
3011         struct vxlan_dev *vxlan = netdev_priv(dev);
3012         struct vxlan_rdst *dst = &vxlan->default_dst;
3013         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3014                                                          dst->remote_ifindex);
3015         bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
3016
3017         /* This check is different than dev->max_mtu, because it looks at
3018          * the lowerdev->mtu, rather than the static dev->max_mtu
3019          */
3020         if (lowerdev) {
3021                 int max_mtu = lowerdev->mtu -
3022                               (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
3023                 if (new_mtu > max_mtu)
3024                         return -EINVAL;
3025         }
3026
3027         dev->mtu = new_mtu;
3028         return 0;
3029 }
3030
3031 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
3032 {
3033         struct vxlan_dev *vxlan = netdev_priv(dev);
3034         struct ip_tunnel_info *info = skb_tunnel_info(skb);
3035         __be16 sport, dport;
3036
3037         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
3038                                   vxlan->cfg.port_max, true);
3039         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
3040
3041         if (ip_tunnel_info_af(info) == AF_INET) {
3042                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
3043                 struct rtable *rt;
3044
3045                 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
3046                                      info->key.u.ipv4.dst,
3047                                      &info->key.u.ipv4.src, dport, sport,
3048                                      &info->dst_cache, info);
3049                 if (IS_ERR(rt))
3050                         return PTR_ERR(rt);
3051                 ip_rt_put(rt);
3052         } else {
3053 #if IS_ENABLED(CONFIG_IPV6)
3054                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
3055                 struct dst_entry *ndst;
3056
3057                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
3058                                         info->key.label, &info->key.u.ipv6.dst,
3059                                         &info->key.u.ipv6.src, dport, sport,
3060                                         &info->dst_cache, info);
3061                 if (IS_ERR(ndst))
3062                         return PTR_ERR(ndst);
3063                 dst_release(ndst);
3064 #else /* !CONFIG_IPV6 */
3065                 return -EPFNOSUPPORT;
3066 #endif
3067         }
3068         info->key.tp_src = sport;
3069         info->key.tp_dst = dport;
3070         return 0;
3071 }
3072
3073 static const struct net_device_ops vxlan_netdev_ether_ops = {
3074         .ndo_init               = vxlan_init,
3075         .ndo_uninit             = vxlan_uninit,
3076         .ndo_open               = vxlan_open,
3077         .ndo_stop               = vxlan_stop,
3078         .ndo_start_xmit         = vxlan_xmit,
3079         .ndo_get_stats64        = dev_get_tstats64,
3080         .ndo_set_rx_mode        = vxlan_set_multicast_list,
3081         .ndo_change_mtu         = vxlan_change_mtu,
3082         .ndo_validate_addr      = eth_validate_addr,
3083         .ndo_set_mac_address    = eth_mac_addr,
3084         .ndo_fdb_add            = vxlan_fdb_add,
3085         .ndo_fdb_del            = vxlan_fdb_delete,
3086         .ndo_fdb_dump           = vxlan_fdb_dump,
3087         .ndo_fdb_get            = vxlan_fdb_get,
3088         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
3089 };
3090
3091 static const struct net_device_ops vxlan_netdev_raw_ops = {
3092         .ndo_init               = vxlan_init,
3093         .ndo_uninit             = vxlan_uninit,
3094         .ndo_open               = vxlan_open,
3095         .ndo_stop               = vxlan_stop,
3096         .ndo_start_xmit         = vxlan_xmit,
3097         .ndo_get_stats64        = dev_get_tstats64,
3098         .ndo_change_mtu         = vxlan_change_mtu,
3099         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
3100 };
3101
3102 /* Info for udev, that this is a virtual tunnel endpoint */
3103 static struct device_type vxlan_type = {
3104         .name = "vxlan",
3105 };
3106
3107 /* Calls the ndo_udp_tunnel_add of the caller in order to
3108  * supply the listening VXLAN udp ports. Callers are expected
3109  * to implement the ndo_udp_tunnel_add.
3110  */
3111 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
3112 {
3113         struct vxlan_sock *vs;
3114         struct net *net = dev_net(dev);
3115         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3116         unsigned int i;
3117
3118         spin_lock(&vn->sock_lock);
3119         for (i = 0; i < PORT_HASH_SIZE; ++i) {
3120                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
3121                         unsigned short type;
3122
3123                         if (vs->flags & VXLAN_F_GPE)
3124                                 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3125                         else
3126                                 type = UDP_TUNNEL_TYPE_VXLAN;
3127
3128                         if (push)
3129                                 udp_tunnel_push_rx_port(dev, vs->sock, type);
3130                         else
3131                                 udp_tunnel_drop_rx_port(dev, vs->sock, type);
3132                 }
3133         }
3134         spin_unlock(&vn->sock_lock);
3135 }
3136
3137 /* Initialize the device structure. */
3138 static void vxlan_setup(struct net_device *dev)
3139 {
3140         struct vxlan_dev *vxlan = netdev_priv(dev);
3141         unsigned int h;
3142
3143         eth_hw_addr_random(dev);
3144         ether_setup(dev);
3145
3146         dev->needs_free_netdev = true;
3147         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3148
3149         dev->features   |= NETIF_F_LLTX;
3150         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
3151         dev->features   |= NETIF_F_RXCSUM;
3152         dev->features   |= NETIF_F_GSO_SOFTWARE;
3153
3154         dev->vlan_features = dev->features;
3155         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
3156         dev->hw_features |= NETIF_F_RXCSUM;
3157         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3158         netif_keep_dst(dev);
3159         dev->priv_flags |= IFF_NO_QUEUE | IFF_CHANGE_PROTO_DOWN;
3160
3161         /* MTU range: 68 - 65535 */
3162         dev->min_mtu = ETH_MIN_MTU;
3163         dev->max_mtu = ETH_MAX_MTU;
3164
3165         INIT_LIST_HEAD(&vxlan->next);
3166
3167         timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3168
3169         vxlan->dev = dev;
3170
3171         for (h = 0; h < FDB_HASH_SIZE; ++h) {
3172                 spin_lock_init(&vxlan->hash_lock[h]);
3173                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3174         }
3175 }
3176
3177 static void vxlan_ether_setup(struct net_device *dev)
3178 {
3179         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3180         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3181         dev->netdev_ops = &vxlan_netdev_ether_ops;
3182 }
3183
3184 static void vxlan_raw_setup(struct net_device *dev)
3185 {
3186         dev->header_ops = NULL;
3187         dev->type = ARPHRD_NONE;
3188         dev->hard_header_len = 0;
3189         dev->addr_len = 0;
3190         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3191         dev->netdev_ops = &vxlan_netdev_raw_ops;
3192 }
3193
3194 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3195         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
3196         [IFLA_VXLAN_GROUP]      = { .len = sizeof_field(struct iphdr, daddr) },
3197         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
3198         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
3199         [IFLA_VXLAN_LOCAL]      = { .len = sizeof_field(struct iphdr, saddr) },
3200         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
3201         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
3202         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
3203         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
3204         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
3205         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
3206         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
3207         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
3208         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
3209         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
3210         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
3211         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
3212         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
3213         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
3214         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
3215         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
3216         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
3217         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
3218         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3219         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
3220         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
3221         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
3222         [IFLA_VXLAN_TTL_INHERIT]        = { .type = NLA_FLAG },
3223         [IFLA_VXLAN_DF]         = { .type = NLA_U8 },
3224         [IFLA_VXLAN_VNIFILTER]  = { .type = NLA_U8 },
3225 };
3226
3227 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3228                           struct netlink_ext_ack *extack)
3229 {
3230         if (tb[IFLA_ADDRESS]) {
3231                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3232                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3233                                             "Provided link layer address is not Ethernet");
3234                         return -EINVAL;
3235                 }
3236
3237                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3238                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3239                                             "Provided Ethernet address is not unicast");
3240                         return -EADDRNOTAVAIL;
3241                 }
3242         }
3243
3244         if (tb[IFLA_MTU]) {
3245                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3246
3247                 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3248                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3249                                             "MTU must be between 68 and 65535");
3250                         return -EINVAL;
3251                 }
3252         }
3253
3254         if (!data) {
3255                 NL_SET_ERR_MSG(extack,
3256                                "Required attributes not provided to perform the operation");
3257                 return -EINVAL;
3258         }
3259
3260         if (data[IFLA_VXLAN_ID]) {
3261                 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3262
3263                 if (id >= VXLAN_N_VID) {
3264                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
3265                                             "VXLAN ID must be lower than 16777216");
3266                         return -ERANGE;
3267                 }
3268         }
3269
3270         if (data[IFLA_VXLAN_PORT_RANGE]) {
3271                 const struct ifla_vxlan_port_range *p
3272                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3273
3274                 if (ntohs(p->high) < ntohs(p->low)) {
3275                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
3276                                             "Invalid source port range");
3277                         return -EINVAL;
3278                 }
3279         }
3280
3281         if (data[IFLA_VXLAN_DF]) {
3282                 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3283
3284                 if (df < 0 || df > VXLAN_DF_MAX) {
3285                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
3286                                             "Invalid DF attribute");
3287                         return -EINVAL;
3288                 }
3289         }
3290
3291         return 0;
3292 }
3293
3294 static void vxlan_get_drvinfo(struct net_device *netdev,
3295                               struct ethtool_drvinfo *drvinfo)
3296 {
3297         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3298         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3299 }
3300
3301 static int vxlan_get_link_ksettings(struct net_device *dev,
3302                                     struct ethtool_link_ksettings *cmd)
3303 {
3304         struct vxlan_dev *vxlan = netdev_priv(dev);
3305         struct vxlan_rdst *dst = &vxlan->default_dst;
3306         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3307                                                          dst->remote_ifindex);
3308
3309         if (!lowerdev) {
3310                 cmd->base.duplex = DUPLEX_UNKNOWN;
3311                 cmd->base.port = PORT_OTHER;
3312                 cmd->base.speed = SPEED_UNKNOWN;
3313
3314                 return 0;
3315         }
3316
3317         return __ethtool_get_link_ksettings(lowerdev, cmd);
3318 }
3319
3320 static const struct ethtool_ops vxlan_ethtool_ops = {
3321         .get_drvinfo            = vxlan_get_drvinfo,
3322         .get_link               = ethtool_op_get_link,
3323         .get_link_ksettings     = vxlan_get_link_ksettings,
3324 };
3325
3326 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3327                                         __be16 port, u32 flags, int ifindex)
3328 {
3329         struct socket *sock;
3330         struct udp_port_cfg udp_conf;
3331         int err;
3332
3333         memset(&udp_conf, 0, sizeof(udp_conf));
3334
3335         if (ipv6) {
3336                 udp_conf.family = AF_INET6;
3337                 udp_conf.use_udp6_rx_checksums =
3338                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3339                 udp_conf.ipv6_v6only = 1;
3340         } else {
3341                 udp_conf.family = AF_INET;
3342         }
3343
3344         udp_conf.local_udp_port = port;
3345         udp_conf.bind_ifindex = ifindex;
3346
3347         /* Open UDP socket */
3348         err = udp_sock_create(net, &udp_conf, &sock);
3349         if (err < 0)
3350                 return ERR_PTR(err);
3351
3352         udp_allow_gso(sock->sk);
3353         return sock;
3354 }
3355
3356 /* Create new listen socket if needed */
3357 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3358                                               __be16 port, u32 flags,
3359                                               int ifindex)
3360 {
3361         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3362         struct vxlan_sock *vs;
3363         struct socket *sock;
3364         unsigned int h;
3365         struct udp_tunnel_sock_cfg tunnel_cfg;
3366
3367         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3368         if (!vs)
3369                 return ERR_PTR(-ENOMEM);
3370
3371         for (h = 0; h < VNI_HASH_SIZE; ++h)
3372                 INIT_HLIST_HEAD(&vs->vni_list[h]);
3373
3374         sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3375         if (IS_ERR(sock)) {
3376                 kfree(vs);
3377                 return ERR_CAST(sock);
3378         }
3379
3380         vs->sock = sock;
3381         refcount_set(&vs->refcnt, 1);
3382         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3383
3384         spin_lock(&vn->sock_lock);
3385         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3386         udp_tunnel_notify_add_rx_port(sock,
3387                                       (vs->flags & VXLAN_F_GPE) ?
3388                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
3389                                       UDP_TUNNEL_TYPE_VXLAN);
3390         spin_unlock(&vn->sock_lock);
3391
3392         /* Mark socket as an encapsulation socket. */
3393         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3394         tunnel_cfg.sk_user_data = vs;
3395         tunnel_cfg.encap_type = 1;
3396         tunnel_cfg.encap_rcv = vxlan_rcv;
3397         tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3398         tunnel_cfg.encap_destroy = NULL;
3399         tunnel_cfg.gro_receive = vxlan_gro_receive;
3400         tunnel_cfg.gro_complete = vxlan_gro_complete;
3401
3402         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3403
3404         return vs;
3405 }
3406
3407 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3408 {
3409         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3410         bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3411         struct vxlan_sock *vs = NULL;
3412         struct vxlan_dev_node *node;
3413         int l3mdev_index = 0;
3414
3415         if (vxlan->cfg.remote_ifindex)
3416                 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3417                         vxlan->net, vxlan->cfg.remote_ifindex);
3418
3419         if (!vxlan->cfg.no_share) {
3420                 spin_lock(&vn->sock_lock);
3421                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3422                                      vxlan->cfg.dst_port, vxlan->cfg.flags,
3423                                      l3mdev_index);
3424                 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3425                         spin_unlock(&vn->sock_lock);
3426                         return -EBUSY;
3427                 }
3428                 spin_unlock(&vn->sock_lock);
3429         }
3430         if (!vs)
3431                 vs = vxlan_socket_create(vxlan->net, ipv6,
3432                                          vxlan->cfg.dst_port, vxlan->cfg.flags,
3433                                          l3mdev_index);
3434         if (IS_ERR(vs))
3435                 return PTR_ERR(vs);
3436 #if IS_ENABLED(CONFIG_IPV6)
3437         if (ipv6) {
3438                 rcu_assign_pointer(vxlan->vn6_sock, vs);
3439                 node = &vxlan->hlist6;
3440         } else
3441 #endif
3442         {
3443                 rcu_assign_pointer(vxlan->vn4_sock, vs);
3444                 node = &vxlan->hlist4;
3445         }
3446
3447         if (metadata && (vxlan->cfg.flags & VXLAN_F_VNIFILTER))
3448                 vxlan_vs_add_vnigrp(vxlan, vs, ipv6);
3449         else
3450                 vxlan_vs_add_dev(vs, vxlan, node);
3451
3452         return 0;
3453 }
3454
3455 static int vxlan_sock_add(struct vxlan_dev *vxlan)
3456 {
3457         bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3458         bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3459         bool ipv4 = !ipv6 || metadata;
3460         int ret = 0;
3461
3462         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3463 #if IS_ENABLED(CONFIG_IPV6)
3464         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3465         if (ipv6) {
3466                 ret = __vxlan_sock_add(vxlan, true);
3467                 if (ret < 0 && ret != -EAFNOSUPPORT)
3468                         ipv4 = false;
3469         }
3470 #endif
3471         if (ipv4)
3472                 ret = __vxlan_sock_add(vxlan, false);
3473         if (ret < 0)
3474                 vxlan_sock_release(vxlan);
3475         return ret;
3476 }
3477
3478 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan,
3479                      struct vxlan_config *conf, __be32 vni)
3480 {
3481         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3482         struct vxlan_dev *tmp;
3483
3484         list_for_each_entry(tmp, &vn->vxlan_list, next) {
3485                 if (tmp == vxlan)
3486                         continue;
3487                 if (tmp->cfg.flags & VXLAN_F_VNIFILTER) {
3488                         if (!vxlan_vnifilter_lookup(tmp, vni))
3489                                 continue;
3490                 } else if (tmp->cfg.vni != vni) {
3491                         continue;
3492                 }
3493                 if (tmp->cfg.dst_port != conf->dst_port)
3494                         continue;
3495                 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3496                     (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3497                         continue;
3498
3499                 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3500                     tmp->cfg.remote_ifindex != conf->remote_ifindex)
3501                         continue;
3502
3503                 return -EEXIST;
3504         }
3505
3506         return 0;
3507 }
3508
3509 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3510                                  struct net_device **lower,
3511                                  struct vxlan_dev *old,
3512                                  struct netlink_ext_ack *extack)
3513 {
3514         bool use_ipv6 = false;
3515
3516         if (conf->flags & VXLAN_F_GPE) {
3517                 /* For now, allow GPE only together with
3518                  * COLLECT_METADATA. This can be relaxed later; in such
3519                  * case, the other side of the PtP link will have to be
3520                  * provided.
3521                  */
3522                 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3523                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3524                         NL_SET_ERR_MSG(extack,
3525                                        "VXLAN GPE does not support this combination of attributes");
3526                         return -EINVAL;
3527                 }
3528         }
3529
3530         if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3531                 /* Unless IPv6 is explicitly requested, assume IPv4 */
3532                 conf->remote_ip.sa.sa_family = AF_INET;
3533                 conf->saddr.sa.sa_family = AF_INET;
3534         } else if (!conf->remote_ip.sa.sa_family) {
3535                 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3536         } else if (!conf->saddr.sa.sa_family) {
3537                 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3538         }
3539
3540         if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3541                 NL_SET_ERR_MSG(extack,
3542                                "Local and remote address must be from the same family");
3543                 return -EINVAL;
3544         }
3545
3546         if (vxlan_addr_multicast(&conf->saddr)) {
3547                 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3548                 return -EINVAL;
3549         }
3550
3551         if (conf->saddr.sa.sa_family == AF_INET6) {
3552                 if (!IS_ENABLED(CONFIG_IPV6)) {
3553                         NL_SET_ERR_MSG(extack,
3554                                        "IPv6 support not enabled in the kernel");
3555                         return -EPFNOSUPPORT;
3556                 }
3557                 use_ipv6 = true;
3558                 conf->flags |= VXLAN_F_IPV6;
3559
3560                 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3561                         int local_type =
3562                                 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3563                         int remote_type =
3564                                 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3565
3566                         if (local_type & IPV6_ADDR_LINKLOCAL) {
3567                                 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3568                                     (remote_type != IPV6_ADDR_ANY)) {
3569                                         NL_SET_ERR_MSG(extack,
3570                                                        "Invalid combination of local and remote address scopes");
3571                                         return -EINVAL;
3572                                 }
3573
3574                                 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3575                         } else {
3576                                 if (remote_type ==
3577                                     (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3578                                         NL_SET_ERR_MSG(extack,
3579                                                        "Invalid combination of local and remote address scopes");
3580                                         return -EINVAL;
3581                                 }
3582
3583                                 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3584                         }
3585                 }
3586         }
3587
3588         if (conf->label && !use_ipv6) {
3589                 NL_SET_ERR_MSG(extack,
3590                                "Label attribute only applies to IPv6 VXLAN devices");
3591                 return -EINVAL;
3592         }
3593
3594         if (conf->remote_ifindex) {
3595                 struct net_device *lowerdev;
3596
3597                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3598                 if (!lowerdev) {
3599                         NL_SET_ERR_MSG(extack,
3600                                        "Invalid local interface, device not found");
3601                         return -ENODEV;
3602                 }
3603
3604 #if IS_ENABLED(CONFIG_IPV6)
3605                 if (use_ipv6) {
3606                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
3607
3608                         if (idev && idev->cnf.disable_ipv6) {
3609                                 NL_SET_ERR_MSG(extack,
3610                                                "IPv6 support disabled by administrator");
3611                                 return -EPERM;
3612                         }
3613                 }
3614 #endif
3615
3616                 *lower = lowerdev;
3617         } else {
3618                 if (vxlan_addr_multicast(&conf->remote_ip)) {
3619                         NL_SET_ERR_MSG(extack,
3620                                        "Local interface required for multicast remote destination");
3621
3622                         return -EINVAL;
3623                 }
3624
3625 #if IS_ENABLED(CONFIG_IPV6)
3626                 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3627                         NL_SET_ERR_MSG(extack,
3628                                        "Local interface required for link-local local/remote addresses");
3629                         return -EINVAL;
3630                 }
3631 #endif
3632
3633                 *lower = NULL;
3634         }
3635
3636         if (!conf->dst_port) {
3637                 if (conf->flags & VXLAN_F_GPE)
3638                         conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT);
3639                 else
3640                         conf->dst_port = htons(vxlan_port);
3641         }
3642
3643         if (!conf->age_interval)
3644                 conf->age_interval = FDB_AGE_DEFAULT;
3645
3646         if (vxlan_vni_in_use(src_net, old, conf, conf->vni)) {
3647                 NL_SET_ERR_MSG(extack,
3648                                "A VXLAN device with the specified VNI already exists");
3649                 return -EEXIST;
3650         }
3651
3652         return 0;
3653 }
3654
3655 static void vxlan_config_apply(struct net_device *dev,
3656                                struct vxlan_config *conf,
3657                                struct net_device *lowerdev,
3658                                struct net *src_net,
3659                                bool changelink)
3660 {
3661         struct vxlan_dev *vxlan = netdev_priv(dev);
3662         struct vxlan_rdst *dst = &vxlan->default_dst;
3663         unsigned short needed_headroom = ETH_HLEN;
3664         bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3665         int max_mtu = ETH_MAX_MTU;
3666
3667         if (!changelink) {
3668                 if (conf->flags & VXLAN_F_GPE)
3669                         vxlan_raw_setup(dev);
3670                 else
3671                         vxlan_ether_setup(dev);
3672
3673                 if (conf->mtu)
3674                         dev->mtu = conf->mtu;
3675
3676                 vxlan->net = src_net;
3677         }
3678
3679         dst->remote_vni = conf->vni;
3680
3681         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3682
3683         if (lowerdev) {
3684                 dst->remote_ifindex = conf->remote_ifindex;
3685
3686                 netif_set_gso_max_size(dev, lowerdev->gso_max_size);
3687                 netif_set_gso_max_segs(dev, lowerdev->gso_max_segs);
3688
3689                 needed_headroom = lowerdev->hard_header_len;
3690                 needed_headroom += lowerdev->needed_headroom;
3691
3692                 dev->needed_tailroom = lowerdev->needed_tailroom;
3693
3694                 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3695                                            VXLAN_HEADROOM);
3696                 if (max_mtu < ETH_MIN_MTU)
3697                         max_mtu = ETH_MIN_MTU;
3698
3699                 if (!changelink && !conf->mtu)
3700                         dev->mtu = max_mtu;
3701         }
3702
3703         if (dev->mtu > max_mtu)
3704                 dev->mtu = max_mtu;
3705
3706         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3707                 needed_headroom += VXLAN6_HEADROOM;
3708         else
3709                 needed_headroom += VXLAN_HEADROOM;
3710         dev->needed_headroom = needed_headroom;
3711
3712         memcpy(&vxlan->cfg, conf, sizeof(*conf));
3713 }
3714
3715 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3716                                struct vxlan_config *conf, bool changelink,
3717                                struct netlink_ext_ack *extack)
3718 {
3719         struct vxlan_dev *vxlan = netdev_priv(dev);
3720         struct net_device *lowerdev;
3721         int ret;
3722
3723         ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3724         if (ret)
3725                 return ret;
3726
3727         vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3728
3729         return 0;
3730 }
3731
3732 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3733                               struct vxlan_config *conf,
3734                               struct netlink_ext_ack *extack)
3735 {
3736         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3737         struct vxlan_dev *vxlan = netdev_priv(dev);
3738         struct net_device *remote_dev = NULL;
3739         struct vxlan_fdb *f = NULL;
3740         bool unregister = false;
3741         struct vxlan_rdst *dst;
3742         int err;
3743
3744         dst = &vxlan->default_dst;
3745         err = vxlan_dev_configure(net, dev, conf, false, extack);
3746         if (err)
3747                 return err;
3748
3749         dev->ethtool_ops = &vxlan_ethtool_ops;
3750
3751         /* create an fdb entry for a valid default destination */
3752         if (!vxlan_addr_any(&dst->remote_ip)) {
3753                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3754                                        &dst->remote_ip,
3755                                        NUD_REACHABLE | NUD_PERMANENT,
3756                                        vxlan->cfg.dst_port,
3757                                        dst->remote_vni,
3758                                        dst->remote_vni,
3759                                        dst->remote_ifindex,
3760                                        NTF_SELF, 0, &f, extack);
3761                 if (err)
3762                         return err;
3763         }
3764
3765         err = register_netdevice(dev);
3766         if (err)
3767                 goto errout;
3768         unregister = true;
3769
3770         if (dst->remote_ifindex) {
3771                 remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
3772                 if (!remote_dev) {
3773                         err = -ENODEV;
3774                         goto errout;
3775                 }
3776
3777                 err = netdev_upper_dev_link(remote_dev, dev, extack);
3778                 if (err)
3779                         goto errout;
3780         }
3781
3782         err = rtnl_configure_link(dev, NULL);
3783         if (err < 0)
3784                 goto unlink;
3785
3786         if (f) {
3787                 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
3788
3789                 /* notify default fdb entry */
3790                 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
3791                                        RTM_NEWNEIGH, true, extack);
3792                 if (err) {
3793                         vxlan_fdb_destroy(vxlan, f, false, false);
3794                         if (remote_dev)
3795                                 netdev_upper_dev_unlink(remote_dev, dev);
3796                         goto unregister;
3797                 }
3798         }
3799
3800         list_add(&vxlan->next, &vn->vxlan_list);
3801         if (remote_dev)
3802                 dst->remote_dev = remote_dev;
3803         return 0;
3804 unlink:
3805         if (remote_dev)
3806                 netdev_upper_dev_unlink(remote_dev, dev);
3807 errout:
3808         /* unregister_netdevice() destroys the default FDB entry with deletion
3809          * notification. But the addition notification was not sent yet, so
3810          * destroy the entry by hand here.
3811          */
3812         if (f)
3813                 __vxlan_fdb_free(f);
3814 unregister:
3815         if (unregister)
3816                 unregister_netdevice(dev);
3817         return err;
3818 }
3819
3820 /* Set/clear flags based on attribute */
3821 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
3822                           int attrtype, unsigned long mask, bool changelink,
3823                           bool changelink_supported,
3824                           struct netlink_ext_ack *extack)
3825 {
3826         unsigned long flags;
3827
3828         if (!tb[attrtype])
3829                 return 0;
3830
3831         if (changelink && !changelink_supported) {
3832                 vxlan_flag_attr_error(attrtype, extack);
3833                 return -EOPNOTSUPP;
3834         }
3835
3836         if (vxlan_policy[attrtype].type == NLA_FLAG)
3837                 flags = conf->flags | mask;
3838         else if (nla_get_u8(tb[attrtype]))
3839                 flags = conf->flags | mask;
3840         else
3841                 flags = conf->flags & ~mask;
3842
3843         conf->flags = flags;
3844
3845         return 0;
3846 }
3847
3848 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3849                          struct net_device *dev, struct vxlan_config *conf,
3850                          bool changelink, struct netlink_ext_ack *extack)
3851 {
3852         struct vxlan_dev *vxlan = netdev_priv(dev);
3853         int err = 0;
3854
3855         memset(conf, 0, sizeof(*conf));
3856
3857         /* if changelink operation, start with old existing cfg */
3858         if (changelink)
3859                 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3860
3861         if (data[IFLA_VXLAN_ID]) {
3862                 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3863
3864                 if (changelink && (vni != conf->vni)) {
3865                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
3866                         return -EOPNOTSUPP;
3867                 }
3868                 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3869         }
3870
3871         if (data[IFLA_VXLAN_GROUP]) {
3872                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
3873                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
3874                         return -EOPNOTSUPP;
3875                 }
3876
3877                 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3878                 conf->remote_ip.sa.sa_family = AF_INET;
3879         } else if (data[IFLA_VXLAN_GROUP6]) {
3880                 if (!IS_ENABLED(CONFIG_IPV6)) {
3881                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
3882                         return -EPFNOSUPPORT;
3883                 }
3884
3885                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
3886                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
3887                         return -EOPNOTSUPP;
3888                 }
3889
3890                 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3891                 conf->remote_ip.sa.sa_family = AF_INET6;
3892         }
3893
3894         if (data[IFLA_VXLAN_LOCAL]) {
3895                 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
3896                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
3897                         return -EOPNOTSUPP;
3898                 }
3899
3900                 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3901                 conf->saddr.sa.sa_family = AF_INET;
3902         } else if (data[IFLA_VXLAN_LOCAL6]) {
3903                 if (!IS_ENABLED(CONFIG_IPV6)) {
3904                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
3905                         return -EPFNOSUPPORT;
3906                 }
3907
3908                 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
3909                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
3910                         return -EOPNOTSUPP;
3911                 }
3912
3913                 /* TODO: respect scope id */
3914                 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3915                 conf->saddr.sa.sa_family = AF_INET6;
3916         }
3917
3918         if (data[IFLA_VXLAN_LINK])
3919                 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3920
3921         if (data[IFLA_VXLAN_TOS])
3922                 conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
3923
3924         if (data[IFLA_VXLAN_TTL])
3925                 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3926
3927         if (data[IFLA_VXLAN_TTL_INHERIT]) {
3928                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
3929                                     VXLAN_F_TTL_INHERIT, changelink, false,
3930                                     extack);
3931                 if (err)
3932                         return err;
3933
3934         }
3935
3936         if (data[IFLA_VXLAN_LABEL])
3937                 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3938                              IPV6_FLOWLABEL_MASK;
3939
3940         if (data[IFLA_VXLAN_LEARNING]) {
3941                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
3942                                     VXLAN_F_LEARN, changelink, true,
3943                                     extack);
3944                 if (err)
3945                         return err;
3946         } else if (!changelink) {
3947                 /* default to learn on a new device */
3948                 conf->flags |= VXLAN_F_LEARN;
3949         }
3950
3951         if (data[IFLA_VXLAN_AGEING])
3952                 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3953
3954         if (data[IFLA_VXLAN_PROXY]) {
3955                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
3956                                     VXLAN_F_PROXY, changelink, false,
3957                                     extack);
3958                 if (err)
3959                         return err;
3960         }
3961
3962         if (data[IFLA_VXLAN_RSC]) {
3963                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
3964                                     VXLAN_F_RSC, changelink, false,
3965                                     extack);
3966                 if (err)
3967                         return err;
3968         }
3969
3970         if (data[IFLA_VXLAN_L2MISS]) {
3971                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
3972                                     VXLAN_F_L2MISS, changelink, false,
3973                                     extack);
3974                 if (err)
3975                         return err;
3976         }
3977
3978         if (data[IFLA_VXLAN_L3MISS]) {
3979                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
3980                                     VXLAN_F_L3MISS, changelink, false,
3981                                     extack);
3982                 if (err)
3983                         return err;
3984         }
3985
3986         if (data[IFLA_VXLAN_LIMIT]) {
3987                 if (changelink) {
3988                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
3989                                             "Cannot change limit");
3990                         return -EOPNOTSUPP;
3991                 }
3992                 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3993         }
3994
3995         if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3996                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
3997                                     VXLAN_F_COLLECT_METADATA, changelink, false,
3998                                     extack);
3999                 if (err)
4000                         return err;
4001         }
4002
4003         if (data[IFLA_VXLAN_PORT_RANGE]) {
4004                 if (!changelink) {
4005                         const struct ifla_vxlan_port_range *p
4006                                 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
4007                         conf->port_min = ntohs(p->low);
4008                         conf->port_max = ntohs(p->high);
4009                 } else {
4010                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
4011                                             "Cannot change port range");
4012                         return -EOPNOTSUPP;
4013                 }
4014         }
4015
4016         if (data[IFLA_VXLAN_PORT]) {
4017                 if (changelink) {
4018                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
4019                                             "Cannot change port");
4020                         return -EOPNOTSUPP;
4021                 }
4022                 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
4023         }
4024
4025         if (data[IFLA_VXLAN_UDP_CSUM]) {
4026                 if (changelink) {
4027                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
4028                                             "Cannot change UDP_CSUM flag");
4029                         return -EOPNOTSUPP;
4030                 }
4031                 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
4032                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
4033         }
4034
4035         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
4036                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4037                                     VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
4038                                     false, extack);
4039                 if (err)
4040                         return err;
4041         }
4042
4043         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
4044                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4045                                     VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
4046                                     false, extack);
4047                 if (err)
4048                         return err;
4049         }
4050
4051         if (data[IFLA_VXLAN_REMCSUM_TX]) {
4052                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
4053                                     VXLAN_F_REMCSUM_TX, changelink, false,
4054                                     extack);
4055                 if (err)
4056                         return err;
4057         }
4058
4059         if (data[IFLA_VXLAN_REMCSUM_RX]) {
4060                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
4061                                     VXLAN_F_REMCSUM_RX, changelink, false,
4062                                     extack);
4063                 if (err)
4064                         return err;
4065         }
4066
4067         if (data[IFLA_VXLAN_GBP]) {
4068                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
4069                                     VXLAN_F_GBP, changelink, false, extack);
4070                 if (err)
4071                         return err;
4072         }
4073
4074         if (data[IFLA_VXLAN_GPE]) {
4075                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
4076                                     VXLAN_F_GPE, changelink, false,
4077                                     extack);
4078                 if (err)
4079                         return err;
4080         }
4081
4082         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
4083                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
4084                                     VXLAN_F_REMCSUM_NOPARTIAL, changelink,
4085                                     false, extack);
4086                 if (err)
4087                         return err;
4088         }
4089
4090         if (tb[IFLA_MTU]) {
4091                 if (changelink) {
4092                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
4093                                             "Cannot change mtu");
4094                         return -EOPNOTSUPP;
4095                 }
4096                 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
4097         }
4098
4099         if (data[IFLA_VXLAN_DF])
4100                 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
4101
4102         if (data[IFLA_VXLAN_VNIFILTER]) {
4103                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_VNIFILTER,
4104                                     VXLAN_F_VNIFILTER, changelink, false,
4105                                     extack);
4106                 if (err)
4107                         return err;
4108
4109                 if ((conf->flags & VXLAN_F_VNIFILTER) &&
4110                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
4111                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_VNIFILTER],
4112                                             "vxlan vnifilter only valid in collect metadata mode");
4113                         return -EINVAL;
4114                 }
4115         }
4116
4117         return 0;
4118 }
4119
4120 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
4121                          struct nlattr *tb[], struct nlattr *data[],
4122                          struct netlink_ext_ack *extack)
4123 {
4124         struct vxlan_config conf;
4125         int err;
4126
4127         err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
4128         if (err)
4129                 return err;
4130
4131         return __vxlan_dev_create(src_net, dev, &conf, extack);
4132 }
4133
4134 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
4135                             struct nlattr *data[],
4136                             struct netlink_ext_ack *extack)
4137 {
4138         struct vxlan_dev *vxlan = netdev_priv(dev);
4139         struct net_device *lowerdev;
4140         struct vxlan_config conf;
4141         struct vxlan_rdst *dst;
4142         int err;
4143
4144         dst = &vxlan->default_dst;
4145         err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
4146         if (err)
4147                 return err;
4148
4149         err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
4150                                     vxlan, extack);
4151         if (err)
4152                 return err;
4153
4154         if (dst->remote_dev == lowerdev)
4155                 lowerdev = NULL;
4156
4157         err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
4158                                              extack);
4159         if (err)
4160                 return err;
4161
4162         /* handle default dst entry */
4163         if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
4164                 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
4165
4166                 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4167                 if (!vxlan_addr_any(&conf.remote_ip)) {
4168                         err = vxlan_fdb_update(vxlan, all_zeros_mac,
4169                                                &conf.remote_ip,
4170                                                NUD_REACHABLE | NUD_PERMANENT,
4171                                                NLM_F_APPEND | NLM_F_CREATE,
4172                                                vxlan->cfg.dst_port,
4173                                                conf.vni, conf.vni,
4174                                                conf.remote_ifindex,
4175                                                NTF_SELF, 0, true, extack);
4176                         if (err) {
4177                                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4178                                 netdev_adjacent_change_abort(dst->remote_dev,
4179                                                              lowerdev, dev);
4180                                 return err;
4181                         }
4182                 }
4183                 if (!vxlan_addr_any(&dst->remote_ip))
4184                         __vxlan_fdb_delete(vxlan, all_zeros_mac,
4185                                            dst->remote_ip,
4186                                            vxlan->cfg.dst_port,
4187                                            dst->remote_vni,
4188                                            dst->remote_vni,
4189                                            dst->remote_ifindex,
4190                                            true);
4191                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4192
4193                 /* If vni filtering device, also update fdb entries of
4194                  * all vnis that were using default remote ip
4195                  */
4196                 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
4197                         err = vxlan_vnilist_update_group(vxlan, &dst->remote_ip,
4198                                                          &conf.remote_ip, extack);
4199                         if (err) {
4200                                 netdev_adjacent_change_abort(dst->remote_dev,
4201                                                              lowerdev, dev);
4202                                 return err;
4203                         }
4204                 }
4205         }
4206
4207         if (conf.age_interval != vxlan->cfg.age_interval)
4208                 mod_timer(&vxlan->age_timer, jiffies);
4209
4210         netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
4211         if (lowerdev && lowerdev != dst->remote_dev)
4212                 dst->remote_dev = lowerdev;
4213         vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
4214         return 0;
4215 }
4216
4217 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
4218 {
4219         struct vxlan_dev *vxlan = netdev_priv(dev);
4220
4221         vxlan_flush(vxlan, true);
4222
4223         list_del(&vxlan->next);
4224         unregister_netdevice_queue(dev, head);
4225         if (vxlan->default_dst.remote_dev)
4226                 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
4227 }
4228
4229 static size_t vxlan_get_size(const struct net_device *dev)
4230 {
4231
4232         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
4233                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4234                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
4235                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4236                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
4237                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL_INHERIT */
4238                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
4239                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_DF */
4240                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4241                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
4242                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
4243                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
4244                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
4245                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
4246                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
4247                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
4248                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
4249                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4250                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4251                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4252                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4253                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4254                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4255                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4256                 0;
4257 }
4258
4259 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4260 {
4261         const struct vxlan_dev *vxlan = netdev_priv(dev);
4262         const struct vxlan_rdst *dst = &vxlan->default_dst;
4263         struct ifla_vxlan_port_range ports = {
4264                 .low =  htons(vxlan->cfg.port_min),
4265                 .high = htons(vxlan->cfg.port_max),
4266         };
4267
4268         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4269                 goto nla_put_failure;
4270
4271         if (!vxlan_addr_any(&dst->remote_ip)) {
4272                 if (dst->remote_ip.sa.sa_family == AF_INET) {
4273                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4274                                             dst->remote_ip.sin.sin_addr.s_addr))
4275                                 goto nla_put_failure;
4276 #if IS_ENABLED(CONFIG_IPV6)
4277                 } else {
4278                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4279                                              &dst->remote_ip.sin6.sin6_addr))
4280                                 goto nla_put_failure;
4281 #endif
4282                 }
4283         }
4284
4285         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4286                 goto nla_put_failure;
4287
4288         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4289                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4290                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4291                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
4292                                 goto nla_put_failure;
4293 #if IS_ENABLED(CONFIG_IPV6)
4294                 } else {
4295                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4296                                              &vxlan->cfg.saddr.sin6.sin6_addr))
4297                                 goto nla_put_failure;
4298 #endif
4299                 }
4300         }
4301
4302         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4303             nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4304                        !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4305             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4306             nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4307             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4308             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4309                        !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4310             nla_put_u8(skb, IFLA_VXLAN_PROXY,
4311                        !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4312             nla_put_u8(skb, IFLA_VXLAN_RSC,
4313                        !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4314             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4315                        !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4316             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4317                        !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4318             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4319                        !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4320             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4321             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4322             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4323             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4324                        !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4325             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4326                        !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4327             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4328                        !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4329             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4330                        !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4331             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4332                        !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
4333                 goto nla_put_failure;
4334
4335         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4336                 goto nla_put_failure;
4337
4338         if (vxlan->cfg.flags & VXLAN_F_GBP &&
4339             nla_put_flag(skb, IFLA_VXLAN_GBP))
4340                 goto nla_put_failure;
4341
4342         if (vxlan->cfg.flags & VXLAN_F_GPE &&
4343             nla_put_flag(skb, IFLA_VXLAN_GPE))
4344                 goto nla_put_failure;
4345
4346         if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4347             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4348                 goto nla_put_failure;
4349
4350         if (vxlan->cfg.flags & VXLAN_F_VNIFILTER &&
4351             nla_put_u8(skb, IFLA_VXLAN_VNIFILTER,
4352                        !!(vxlan->cfg.flags & VXLAN_F_VNIFILTER)))
4353                 goto nla_put_failure;
4354
4355         return 0;
4356
4357 nla_put_failure:
4358         return -EMSGSIZE;
4359 }
4360
4361 static struct net *vxlan_get_link_net(const struct net_device *dev)
4362 {
4363         struct vxlan_dev *vxlan = netdev_priv(dev);
4364
4365         return vxlan->net;
4366 }
4367
4368 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4369         .kind           = "vxlan",
4370         .maxtype        = IFLA_VXLAN_MAX,
4371         .policy         = vxlan_policy,
4372         .priv_size      = sizeof(struct vxlan_dev),
4373         .setup          = vxlan_setup,
4374         .validate       = vxlan_validate,
4375         .newlink        = vxlan_newlink,
4376         .changelink     = vxlan_changelink,
4377         .dellink        = vxlan_dellink,
4378         .get_size       = vxlan_get_size,
4379         .fill_info      = vxlan_fill_info,
4380         .get_link_net   = vxlan_get_link_net,
4381 };
4382
4383 struct net_device *vxlan_dev_create(struct net *net, const char *name,
4384                                     u8 name_assign_type,
4385                                     struct vxlan_config *conf)
4386 {
4387         struct nlattr *tb[IFLA_MAX + 1];
4388         struct net_device *dev;
4389         int err;
4390
4391         memset(&tb, 0, sizeof(tb));
4392
4393         dev = rtnl_create_link(net, name, name_assign_type,
4394                                &vxlan_link_ops, tb, NULL);
4395         if (IS_ERR(dev))
4396                 return dev;
4397
4398         err = __vxlan_dev_create(net, dev, conf, NULL);
4399         if (err < 0) {
4400                 free_netdev(dev);
4401                 return ERR_PTR(err);
4402         }
4403
4404         err = rtnl_configure_link(dev, NULL);
4405         if (err < 0) {
4406                 LIST_HEAD(list_kill);
4407
4408                 vxlan_dellink(dev, &list_kill);
4409                 unregister_netdevice_many(&list_kill);
4410                 return ERR_PTR(err);
4411         }
4412
4413         return dev;
4414 }
4415 EXPORT_SYMBOL_GPL(vxlan_dev_create);
4416
4417 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4418                                              struct net_device *dev)
4419 {
4420         struct vxlan_dev *vxlan, *next;
4421         LIST_HEAD(list_kill);
4422
4423         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4424                 struct vxlan_rdst *dst = &vxlan->default_dst;
4425
4426                 /* In case we created vxlan device with carrier
4427                  * and we loose the carrier due to module unload
4428                  * we also need to remove vxlan device. In other
4429                  * cases, it's not necessary and remote_ifindex
4430                  * is 0 here, so no matches.
4431                  */
4432                 if (dst->remote_ifindex == dev->ifindex)
4433                         vxlan_dellink(vxlan->dev, &list_kill);
4434         }
4435
4436         unregister_netdevice_many(&list_kill);
4437 }
4438
4439 static int vxlan_netdevice_event(struct notifier_block *unused,
4440                                  unsigned long event, void *ptr)
4441 {
4442         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4443         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4444
4445         if (event == NETDEV_UNREGISTER)
4446                 vxlan_handle_lowerdev_unregister(vn, dev);
4447         else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
4448                 vxlan_offload_rx_ports(dev, true);
4449         else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
4450                 vxlan_offload_rx_ports(dev, false);
4451
4452         return NOTIFY_DONE;
4453 }
4454
4455 static struct notifier_block vxlan_notifier_block __read_mostly = {
4456         .notifier_call = vxlan_netdevice_event,
4457 };
4458
4459 static void
4460 vxlan_fdb_offloaded_set(struct net_device *dev,
4461                         struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4462 {
4463         struct vxlan_dev *vxlan = netdev_priv(dev);
4464         struct vxlan_rdst *rdst;
4465         struct vxlan_fdb *f;
4466         u32 hash_index;
4467
4468         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4469
4470         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4471
4472         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4473         if (!f)
4474                 goto out;
4475
4476         rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4477                                    fdb_info->remote_port,
4478                                    fdb_info->remote_vni,
4479                                    fdb_info->remote_ifindex);
4480         if (!rdst)
4481                 goto out;
4482
4483         rdst->offloaded = fdb_info->offloaded;
4484
4485 out:
4486         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4487 }
4488
4489 static int
4490 vxlan_fdb_external_learn_add(struct net_device *dev,
4491                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4492 {
4493         struct vxlan_dev *vxlan = netdev_priv(dev);
4494         struct netlink_ext_ack *extack;
4495         u32 hash_index;
4496         int err;
4497
4498         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4499         extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4500
4501         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4502         err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4503                                NUD_REACHABLE,
4504                                NLM_F_CREATE | NLM_F_REPLACE,
4505                                fdb_info->remote_port,
4506                                fdb_info->vni,
4507                                fdb_info->remote_vni,
4508                                fdb_info->remote_ifindex,
4509                                NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4510                                0, false, extack);
4511         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4512
4513         return err;
4514 }
4515
4516 static int
4517 vxlan_fdb_external_learn_del(struct net_device *dev,
4518                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4519 {
4520         struct vxlan_dev *vxlan = netdev_priv(dev);
4521         struct vxlan_fdb *f;
4522         u32 hash_index;
4523         int err = 0;
4524
4525         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4526         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4527
4528         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4529         if (!f)
4530                 err = -ENOENT;
4531         else if (f->flags & NTF_EXT_LEARNED)
4532                 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4533                                          fdb_info->remote_ip,
4534                                          fdb_info->remote_port,
4535                                          fdb_info->vni,
4536                                          fdb_info->remote_vni,
4537                                          fdb_info->remote_ifindex,
4538                                          false);
4539
4540         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4541
4542         return err;
4543 }
4544
4545 static int vxlan_switchdev_event(struct notifier_block *unused,
4546                                  unsigned long event, void *ptr)
4547 {
4548         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4549         struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4550         int err = 0;
4551
4552         switch (event) {
4553         case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4554                 vxlan_fdb_offloaded_set(dev, ptr);
4555                 break;
4556         case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4557                 fdb_info = ptr;
4558                 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4559                 if (err) {
4560                         err = notifier_from_errno(err);
4561                         break;
4562                 }
4563                 fdb_info->offloaded = true;
4564                 vxlan_fdb_offloaded_set(dev, fdb_info);
4565                 break;
4566         case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4567                 fdb_info = ptr;
4568                 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4569                 if (err) {
4570                         err = notifier_from_errno(err);
4571                         break;
4572                 }
4573                 fdb_info->offloaded = false;
4574                 vxlan_fdb_offloaded_set(dev, fdb_info);
4575                 break;
4576         }
4577
4578         return err;
4579 }
4580
4581 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4582         .notifier_call = vxlan_switchdev_event,
4583 };
4584
4585 static void vxlan_fdb_nh_flush(struct nexthop *nh)
4586 {
4587         struct vxlan_fdb *fdb;
4588         struct vxlan_dev *vxlan;
4589         u32 hash_index;
4590
4591         rcu_read_lock();
4592         list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
4593                 vxlan = rcu_dereference(fdb->vdev);
4594                 WARN_ON(!vxlan);
4595                 hash_index = fdb_head_index(vxlan, fdb->eth_addr,
4596                                             vxlan->default_dst.remote_vni);
4597                 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4598                 if (!hlist_unhashed(&fdb->hlist))
4599                         vxlan_fdb_destroy(vxlan, fdb, false, false);
4600                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4601         }
4602         rcu_read_unlock();
4603 }
4604
4605 static int vxlan_nexthop_event(struct notifier_block *nb,
4606                                unsigned long event, void *ptr)
4607 {
4608         struct nh_notifier_info *info = ptr;
4609         struct nexthop *nh;
4610
4611         if (event != NEXTHOP_EVENT_DEL)
4612                 return NOTIFY_DONE;
4613
4614         nh = nexthop_find_by_id(info->net, info->id);
4615         if (!nh)
4616                 return NOTIFY_DONE;
4617
4618         vxlan_fdb_nh_flush(nh);
4619
4620         return NOTIFY_DONE;
4621 }
4622
4623 static __net_init int vxlan_init_net(struct net *net)
4624 {
4625         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4626         unsigned int h;
4627
4628         INIT_LIST_HEAD(&vn->vxlan_list);
4629         spin_lock_init(&vn->sock_lock);
4630         vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event;
4631
4632         for (h = 0; h < PORT_HASH_SIZE; ++h)
4633                 INIT_HLIST_HEAD(&vn->sock_list[h]);
4634
4635         return register_nexthop_notifier(net, &vn->nexthop_notifier_block,
4636                                          NULL);
4637 }
4638
4639 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
4640 {
4641         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4642         struct vxlan_dev *vxlan, *next;
4643         struct net_device *dev, *aux;
4644
4645         for_each_netdev_safe(net, dev, aux)
4646                 if (dev->rtnl_link_ops == &vxlan_link_ops)
4647                         unregister_netdevice_queue(dev, head);
4648
4649         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4650                 /* If vxlan->dev is in the same netns, it has already been added
4651                  * to the list by the previous loop.
4652                  */
4653                 if (!net_eq(dev_net(vxlan->dev), net))
4654                         unregister_netdevice_queue(vxlan->dev, head);
4655         }
4656
4657 }
4658
4659 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
4660 {
4661         struct net *net;
4662         LIST_HEAD(list);
4663         unsigned int h;
4664
4665         list_for_each_entry(net, net_list, exit_list) {
4666                 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4667
4668                 unregister_nexthop_notifier(net, &vn->nexthop_notifier_block);
4669         }
4670         rtnl_lock();
4671         list_for_each_entry(net, net_list, exit_list)
4672                 vxlan_destroy_tunnels(net, &list);
4673
4674         unregister_netdevice_many(&list);
4675         rtnl_unlock();
4676
4677         list_for_each_entry(net, net_list, exit_list) {
4678                 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4679
4680                 for (h = 0; h < PORT_HASH_SIZE; ++h)
4681                         WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4682         }
4683 }
4684
4685 static struct pernet_operations vxlan_net_ops = {
4686         .init = vxlan_init_net,
4687         .exit_batch = vxlan_exit_batch_net,
4688         .id   = &vxlan_net_id,
4689         .size = sizeof(struct vxlan_net),
4690 };
4691
4692 static int __init vxlan_init_module(void)
4693 {
4694         int rc;
4695
4696         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4697
4698         rc = register_pernet_subsys(&vxlan_net_ops);
4699         if (rc)
4700                 goto out1;
4701
4702         rc = register_netdevice_notifier(&vxlan_notifier_block);
4703         if (rc)
4704                 goto out2;
4705
4706         rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4707         if (rc)
4708                 goto out3;
4709
4710         rc = rtnl_link_register(&vxlan_link_ops);
4711         if (rc)
4712                 goto out4;
4713
4714         vxlan_vnifilter_init();
4715
4716         return 0;
4717 out4:
4718         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4719 out3:
4720         unregister_netdevice_notifier(&vxlan_notifier_block);
4721 out2:
4722         unregister_pernet_subsys(&vxlan_net_ops);
4723 out1:
4724         return rc;
4725 }
4726 late_initcall(vxlan_init_module);
4727
4728 static void __exit vxlan_cleanup_module(void)
4729 {
4730         vxlan_vnifilter_uninit();
4731         rtnl_link_unregister(&vxlan_link_ops);
4732         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4733         unregister_netdevice_notifier(&vxlan_notifier_block);
4734         unregister_pernet_subsys(&vxlan_net_ops);
4735         /* rcu_barrier() is called by netns */
4736 }
4737 module_exit(vxlan_cleanup_module);
4738
4739 MODULE_LICENSE("GPL");
4740 MODULE_VERSION(VXLAN_VERSION);
4741 MODULE_AUTHOR("Stephen Hemminger <[email protected]>");
4742 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4743 MODULE_ALIAS_RTNL_LINK("vxlan");