drivers/net/geneve.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * GENEVE: Generic Network Virtualization Encapsulation
   4  *
   5  * Copyright (c) 2015 Red Hat, Inc.
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/ethtool.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/hash.h>
  15 #include <net/ipv6_stubs.h>
  16 #include <net/dst_metadata.h>
  17 #include <net/gro_cells.h>
  18 #include <net/rtnetlink.h>
  19 #include <net/geneve.h>
  20 #include <net/gro.h>
  21 #include <net/protocol.h>
  22
  23 #define GENEVE_NETDEV_VER       "0.6"
  24
  25 #define GENEVE_N_VID            (1u << 24)
  26 #define GENEVE_VID_MASK         (GENEVE_N_VID - 1)
  27
  28 #define VNI_HASH_BITS           10
  29 #define VNI_HASH_SIZE           (1<<VNI_HASH_BITS)
  30
  31 static bool log_ecn_error = true;
  32 module_param(log_ecn_error, bool, 0644);
  33 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  34
  35 #define GENEVE_VER 0
  36 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
  37 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
  38 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
  39
  40 /* per-network namespace private data for this module */
  41 struct geneve_net {
  42         struct list_head        geneve_list;
  43         struct list_head        sock_list;
  44 };
  45
  46 static unsigned int geneve_net_id;
  47
  48 struct geneve_dev_node {
  49         struct hlist_node hlist;
  50         struct geneve_dev *geneve;
  51 };
  52
  53 struct geneve_config {
  54         struct ip_tunnel_info   info;
  55         bool                    collect_md;
  56         bool                    use_udp6_rx_checksums;
  57         bool                    ttl_inherit;
  58         enum ifla_geneve_df     df;
  59         bool                    inner_proto_inherit;
  60 };
  61
  62 /* Pseudo network device */
  63 struct geneve_dev {
  64         struct geneve_dev_node hlist4;  /* vni hash table for IPv4 socket */
  65 #if IS_ENABLED(CONFIG_IPV6)
  66         struct geneve_dev_node hlist6;  /* vni hash table for IPv6 socket */
  67 #endif
  68         struct net         *net;        /* netns for packet i/o */
  69         struct net_device  *dev;        /* netdev for geneve tunnel */
  70         struct geneve_sock __rcu *sock4;        /* IPv4 socket used for geneve tunnel */
  71 #if IS_ENABLED(CONFIG_IPV6)
  72         struct geneve_sock __rcu *sock6;        /* IPv6 socket used for geneve tunnel */
  73 #endif
  74         struct list_head   next;        /* geneve's per namespace list */
  75         struct gro_cells   gro_cells;
  76         struct geneve_config cfg;
  77 };
  78
  79 struct geneve_sock {
  80         bool                    collect_md;
  81         struct list_head        list;
  82         struct socket           *sock;
  83         struct rcu_head         rcu;
  84         int                     refcnt;
  85         struct hlist_head       vni_list[VNI_HASH_SIZE];
  86 };
  87
  88 static inline __u32 geneve_net_vni_hash(u8 vni[3])
  89 {
  90         __u32 vnid;
  91
  92         vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  93         return hash_32(vnid, VNI_HASH_BITS);
  94 }
  95
  96 static __be64 vni_to_tunnel_id(const __u8 *vni)
  97 {
  98 #ifdef __BIG_ENDIAN
  99         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
 100 #else
 101         return (__force __be64)(((__force u64)vni[0] << 40) |
 102                                 ((__force u64)vni[1] << 48) |
 103                                 ((__force u64)vni[2] << 56));
 104 #endif
 105 }
 106
 107 /* Convert 64 bit tunnel ID to 24 bit VNI. */
 108 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 109 {
 110 #ifdef __BIG_ENDIAN
 111         vni[0] = (__force __u8)(tun_id >> 16);
 112         vni[1] = (__force __u8)(tun_id >> 8);
 113         vni[2] = (__force __u8)tun_id;
 114 #else
 115         vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 116         vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 117         vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 118 #endif
 119 }
 120
 121 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
 122 {
 123         return !memcmp(vni, &tun_id[5], 3);
 124 }
 125
 126 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
 127 {
 128         return gs->sock->sk->sk_family;
 129 }
 130
 131 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 132                                         __be32 addr, u8 vni[])
 133 {
 134         struct hlist_head *vni_list_head;
 135         struct geneve_dev_node *node;
 136         __u32 hash;
 137
 138         /* Find the device for this VNI */
 139         hash = geneve_net_vni_hash(vni);
 140         vni_list_head = &gs->vni_list[hash];
 141         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 142                 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
 143                     addr == node->geneve->cfg.info.key.u.ipv4.dst)
 144                         return node->geneve;
 145         }
 146         return NULL;
 147 }
 148
 149 #if IS_ENABLED(CONFIG_IPV6)
 150 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 151                                          struct in6_addr addr6, u8 vni[])
 152 {
 153         struct hlist_head *vni_list_head;
 154         struct geneve_dev_node *node;
 155         __u32 hash;
 156
 157         /* Find the device for this VNI */
 158         hash = geneve_net_vni_hash(vni);
 159         vni_list_head = &gs->vni_list[hash];
 160         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 161                 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
 162                     ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
 163                         return node->geneve;
 164         }
 165         return NULL;
 166 }
 167 #endif
 168
 169 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 170 {
 171         return (struct genevehdr *)(udp_hdr(skb) + 1);
 172 }
 173
 174 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
 175                                             struct sk_buff *skb)
 176 {
 177         static u8 zero_vni[3];
 178         u8 *vni;
 179
 180         if (geneve_get_sk_family(gs) == AF_INET) {
 181                 struct iphdr *iph;
 182                 __be32 addr;
 183
 184                 iph = ip_hdr(skb); /* outer IP header... */
 185
 186                 if (gs->collect_md) {
 187                         vni = zero_vni;
 188                         addr = 0;
 189                 } else {
 190                         vni = geneve_hdr(skb)->vni;
 191                         addr = iph->saddr;
 192                 }
 193
 194                 return geneve_lookup(gs, addr, vni);
 195 #if IS_ENABLED(CONFIG_IPV6)
 196         } else if (geneve_get_sk_family(gs) == AF_INET6) {
 197                 static struct in6_addr zero_addr6;
 198                 struct ipv6hdr *ip6h;
 199                 struct in6_addr addr6;
 200
 201                 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 202
 203                 if (gs->collect_md) {
 204                         vni = zero_vni;
 205                         addr6 = zero_addr6;
 206                 } else {
 207                         vni = geneve_hdr(skb)->vni;
 208                         addr6 = ip6h->saddr;
 209                 }
 210
 211                 return geneve6_lookup(gs, addr6, vni);
 212 #endif
 213         }
 214         return NULL;
 215 }
 216
 217 /* geneve receive/decap routine */
 218 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 219                       struct sk_buff *skb)
 220 {
 221         struct genevehdr *gnvh = geneve_hdr(skb);
 222         struct metadata_dst *tun_dst = NULL;
 223         unsigned int len;
 224         int nh, err = 0;
 225         void *oiph;
 226
 227         if (ip_tunnel_collect_metadata() || gs->collect_md) {
 228                 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
 229
 230                 __set_bit(IP_TUNNEL_KEY_BIT, flags);
 231                 __assign_bit(IP_TUNNEL_OAM_BIT, flags, gnvh->oam);
 232                 __assign_bit(IP_TUNNEL_CRIT_OPT_BIT, flags, gnvh->critical);
 233
 234                 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
 235                                          vni_to_tunnel_id(gnvh->vni),
 236                                          gnvh->opt_len * 4);
 237                 if (!tun_dst) {
 238                         DEV_STATS_INC(geneve->dev, rx_dropped);
 239                         goto drop;
 240                 }
 241                 /* Update tunnel dst according to Geneve options. */
 242                 ip_tunnel_flags_zero(flags);
 243                 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, flags);
 244                 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 245                                         gnvh->options, gnvh->opt_len * 4,
 246                                         flags);
 247         } else {
 248                 /* Drop packets w/ critical options,
 249                  * since we don't support any...
 250                  */
 251                 if (gnvh->critical) {
 252                         DEV_STATS_INC(geneve->dev, rx_frame_errors);
 253                         DEV_STATS_INC(geneve->dev, rx_errors);
 254                         goto drop;
 255                 }
 256         }
 257
 258         if (tun_dst)
 259                 skb_dst_set(skb, &tun_dst->dst);
 260
 261         if (gnvh->proto_type == htons(ETH_P_TEB)) {
 262                 skb_reset_mac_header(skb);
 263                 skb->protocol = eth_type_trans(skb, geneve->dev);
 264                 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 265
 266                 /* Ignore packet loops (and multicast echo) */
 267                 if (ether_addr_equal(eth_hdr(skb)->h_source,
 268                                      geneve->dev->dev_addr)) {
 269                         DEV_STATS_INC(geneve->dev, rx_errors);
 270                         goto drop;
 271                 }
 272         } else {
 273                 skb_reset_mac_header(skb);
 274                 skb->dev = geneve->dev;
 275                 skb->pkt_type = PACKET_HOST;
 276         }
 277
 278         /* Save offset of outer header relative to skb->head,
 279          * because we are going to reset the network header to the inner header
 280          * and might change skb->head.
 281          */
 282         nh = skb_network_header(skb) - skb->head;
 283
 284         skb_reset_network_header(skb);
 285
 286         if (!pskb_inet_may_pull(skb)) {
 287                 DEV_STATS_INC(geneve->dev, rx_length_errors);
 288                 DEV_STATS_INC(geneve->dev, rx_errors);
 289                 goto drop;
 290         }
 291
 292         /* Get the outer header. */
 293         oiph = skb->head + nh;
 294
 295         if (geneve_get_sk_family(gs) == AF_INET)
 296                 err = IP_ECN_decapsulate(oiph, skb);
 297 #if IS_ENABLED(CONFIG_IPV6)
 298         else
 299                 err = IP6_ECN_decapsulate(oiph, skb);
 300 #endif
 301
 302         if (unlikely(err)) {
 303                 if (log_ecn_error) {
 304                         if (geneve_get_sk_family(gs) == AF_INET)
 305                                 net_info_ratelimited("non-ECT from %pI4 "
 306                                                      "with TOS=%#x\n",
 307                                                      &((struct iphdr *)oiph)->saddr,
 308                                                      ((struct iphdr *)oiph)->tos);
 309 #if IS_ENABLED(CONFIG_IPV6)
 310                         else
 311                                 net_info_ratelimited("non-ECT from %pI6\n",
 312                                                      &((struct ipv6hdr *)oiph)->saddr);
 313 #endif
 314                 }
 315                 if (err > 1) {
 316                         DEV_STATS_INC(geneve->dev, rx_frame_errors);
 317                         DEV_STATS_INC(geneve->dev, rx_errors);
 318                         goto drop;
 319                 }
 320         }
 321
 322         len = skb->len;
 323         err = gro_cells_receive(&geneve->gro_cells, skb);
 324         if (likely(err == NET_RX_SUCCESS))
 325                 dev_sw_netstats_rx_add(geneve->dev, len);
 326
 327         return;
 328 drop:
 329         /* Consume bad packet */
 330         kfree_skb(skb);
 331 }
 332
 333 /* Setup stats when device is created */
 334 static int geneve_init(struct net_device *dev)
 335 {
 336         struct geneve_dev *geneve = netdev_priv(dev);
 337         int err;
 338
 339         err = gro_cells_init(&geneve->gro_cells, dev);
 340         if (err)
 341                 return err;
 342
 343         err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
 344         if (err) {
 345                 gro_cells_destroy(&geneve->gro_cells);
 346                 return err;
 347         }
 348         netdev_lockdep_set_classes(dev);
 349         return 0;
 350 }
 351
 352 static void geneve_uninit(struct net_device *dev)
 353 {
 354         struct geneve_dev *geneve = netdev_priv(dev);
 355
 356         dst_cache_destroy(&geneve->cfg.info.dst_cache);
 357         gro_cells_destroy(&geneve->gro_cells);
 358 }
 359
 360 /* Callback from net/ipv4/udp.c to receive packets */
 361 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 362 {
 363         struct genevehdr *geneveh;
 364         struct geneve_dev *geneve;
 365         struct geneve_sock *gs;
 366         __be16 inner_proto;
 367         int opts_len;
 368
 369         /* Need UDP and Geneve header to be present */
 370         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 371                 goto drop;
 372
 373         /* Return packets with reserved bits set */
 374         geneveh = geneve_hdr(skb);
 375         if (unlikely(geneveh->ver != GENEVE_VER))
 376                 goto drop;
 377
 378         gs = rcu_dereference_sk_user_data(sk);
 379         if (!gs)
 380                 goto drop;
 381
 382         geneve = geneve_lookup_skb(gs, skb);
 383         if (!geneve)
 384                 goto drop;
 385
 386         inner_proto = geneveh->proto_type;
 387
 388         if (unlikely((!geneve->cfg.inner_proto_inherit &&
 389                       inner_proto != htons(ETH_P_TEB)))) {
 390                 DEV_STATS_INC(geneve->dev, rx_dropped);
 391                 goto drop;
 392         }
 393
 394         opts_len = geneveh->opt_len * 4;
 395         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto,
 396                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 397                 DEV_STATS_INC(geneve->dev, rx_dropped);
 398                 goto drop;
 399         }
 400
 401         geneve_rx(geneve, gs, skb);
 402         return 0;
 403
 404 drop:
 405         /* Consume bad packet */
 406         kfree_skb(skb);
 407         return 0;
 408 }
 409
 410 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
 411 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
 412 {
 413         struct genevehdr *geneveh;
 414         struct geneve_sock *gs;
 415         u8 zero_vni[3] = { 0 };
 416         u8 *vni = zero_vni;
 417
 418         if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
 419                 return -EINVAL;
 420
 421         geneveh = geneve_hdr(skb);
 422         if (geneveh->ver != GENEVE_VER)
 423                 return -EINVAL;
 424
 425         if (geneveh->proto_type != htons(ETH_P_TEB))
 426                 return -EINVAL;
 427
 428         gs = rcu_dereference_sk_user_data(sk);
 429         if (!gs)
 430                 return -ENOENT;
 431
 432         if (geneve_get_sk_family(gs) == AF_INET) {
 433                 struct iphdr *iph = ip_hdr(skb);
 434                 __be32 addr4 = 0;
 435
 436                 if (!gs->collect_md) {
 437                         vni = geneve_hdr(skb)->vni;
 438                         addr4 = iph->daddr;
 439                 }
 440
 441                 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
 442         }
 443
 444 #if IS_ENABLED(CONFIG_IPV6)
 445         if (geneve_get_sk_family(gs) == AF_INET6) {
 446                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
 447                 struct in6_addr addr6;
 448
 449                 memset(&addr6, 0, sizeof(struct in6_addr));
 450
 451                 if (!gs->collect_md) {
 452                         vni = geneve_hdr(skb)->vni;
 453                         addr6 = ip6h->daddr;
 454                 }
 455
 456                 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
 457         }
 458 #endif
 459
 460         return -EPFNOSUPPORT;
 461 }
 462
 463 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 464                                          __be16 port, bool ipv6_rx_csum)
 465 {
 466         struct socket *sock;
 467         struct udp_port_cfg udp_conf;
 468         int err;
 469
 470         memset(&udp_conf, 0, sizeof(udp_conf));
 471
 472         if (ipv6) {
 473                 udp_conf.family = AF_INET6;
 474                 udp_conf.ipv6_v6only = 1;
 475                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 476         } else {
 477                 udp_conf.family = AF_INET;
 478                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 479         }
 480
 481         udp_conf.local_udp_port = port;
 482
 483         /* Open UDP socket */
 484         err = udp_sock_create(net, &udp_conf, &sock);
 485         if (err < 0)
 486                 return ERR_PTR(err);
 487
 488         udp_allow_gso(sock->sk);
 489         return sock;
 490 }
 491
 492 static int geneve_hlen(struct genevehdr *gh)
 493 {
 494         return sizeof(*gh) + gh->opt_len * 4;
 495 }
 496
 497 static struct sk_buff *geneve_gro_receive(struct sock *sk,
 498                                           struct list_head *head,
 499                                           struct sk_buff *skb)
 500 {
 501         struct sk_buff *pp = NULL;
 502         struct sk_buff *p;
 503         struct genevehdr *gh, *gh2;
 504         unsigned int hlen, gh_len, off_gnv;
 505         const struct packet_offload *ptype;
 506         __be16 type;
 507         int flush = 1;
 508
 509         off_gnv = skb_gro_offset(skb);
 510         hlen = off_gnv + sizeof(*gh);
 511         gh = skb_gro_header(skb, hlen, off_gnv);
 512         if (unlikely(!gh))
 513                 goto out;
 514
 515         if (gh->ver != GENEVE_VER || gh->oam)
 516                 goto out;
 517         gh_len = geneve_hlen(gh);
 518
 519         hlen = off_gnv + gh_len;
 520         if (!skb_gro_may_pull(skb, hlen)) {
 521                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 522                 if (unlikely(!gh))
 523                         goto out;
 524         }
 525
 526         list_for_each_entry(p, head, list) {
 527                 if (!NAPI_GRO_CB(p)->same_flow)
 528                         continue;
 529
 530                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 531                 if (gh->opt_len != gh2->opt_len ||
 532                     memcmp(gh, gh2, gh_len)) {
 533                         NAPI_GRO_CB(p)->same_flow = 0;
 534                         continue;
 535                 }
 536         }
 537
 538         skb_gro_pull(skb, gh_len);
 539         skb_gro_postpull_rcsum(skb, gh, gh_len);
 540         type = gh->proto_type;
 541         if (likely(type == htons(ETH_P_TEB)))
 542                 return call_gro_receive(eth_gro_receive, head, skb);
 543
 544         ptype = gro_find_receive_by_type(type);
 545         if (!ptype)
 546                 goto out;
 547
 548         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 549         flush = 0;
 550
 551 out:
 552         skb_gro_flush_final(skb, pp, flush);
 553
 554         return pp;
 555 }
 556
 557 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 558                                int nhoff)
 559 {
 560         struct genevehdr *gh;
 561         struct packet_offload *ptype;
 562         __be16 type;
 563         int gh_len;
 564         int err = -ENOSYS;
 565
 566         gh = (struct genevehdr *)(skb->data + nhoff);
 567         gh_len = geneve_hlen(gh);
 568         type = gh->proto_type;
 569
 570         /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */
 571         if (likely(type == htons(ETH_P_TEB)))
 572                 return eth_gro_complete(skb, nhoff + gh_len);
 573
 574         ptype = gro_find_complete_by_type(type);
 575         if (ptype)
 576                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 577
 578         skb_set_inner_mac_header(skb, nhoff + gh_len);
 579
 580         return err;
 581 }
 582
 583 /* Create new listen socket if needed */
 584 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 585                                                 bool ipv6, bool ipv6_rx_csum)
 586 {
 587         struct geneve_net *gn = net_generic(net, geneve_net_id);
 588         struct geneve_sock *gs;
 589         struct socket *sock;
 590         struct udp_tunnel_sock_cfg tunnel_cfg;
 591         int h;
 592
 593         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 594         if (!gs)
 595                 return ERR_PTR(-ENOMEM);
 596
 597         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 598         if (IS_ERR(sock)) {
 599                 kfree(gs);
 600                 return ERR_CAST(sock);
 601         }
 602
 603         gs->sock = sock;
 604         gs->refcnt = 1;
 605         for (h = 0; h < VNI_HASH_SIZE; ++h)
 606                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 607
 608         /* Initialize the geneve udp offloads structure */
 609         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 610
 611         /* Mark socket as an encapsulation socket */
 612         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 613         tunnel_cfg.sk_user_data = gs;
 614         tunnel_cfg.encap_type = 1;
 615         tunnel_cfg.gro_receive = geneve_gro_receive;
 616         tunnel_cfg.gro_complete = geneve_gro_complete;
 617         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 618         tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
 619         tunnel_cfg.encap_destroy = NULL;
 620         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 621         list_add(&gs->list, &gn->sock_list);
 622         return gs;
 623 }
 624
 625 static void __geneve_sock_release(struct geneve_sock *gs)
 626 {
 627         if (!gs || --gs->refcnt)
 628                 return;
 629
 630         list_del(&gs->list);
 631         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 632         udp_tunnel_sock_release(gs->sock);
 633         kfree_rcu(gs, rcu);
 634 }
 635
 636 static void geneve_sock_release(struct geneve_dev *geneve)
 637 {
 638         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 639 #if IS_ENABLED(CONFIG_IPV6)
 640         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 641
 642         rcu_assign_pointer(geneve->sock6, NULL);
 643 #endif
 644
 645         rcu_assign_pointer(geneve->sock4, NULL);
 646         synchronize_net();
 647
 648         __geneve_sock_release(gs4);
 649 #if IS_ENABLED(CONFIG_IPV6)
 650         __geneve_sock_release(gs6);
 651 #endif
 652 }
 653
 654 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 655                                             sa_family_t family,
 656                                             __be16 dst_port)
 657 {
 658         struct geneve_sock *gs;
 659
 660         list_for_each_entry(gs, &gn->sock_list, list) {
 661                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 662                     geneve_get_sk_family(gs) == family) {
 663                         return gs;
 664                 }
 665         }
 666         return NULL;
 667 }
 668
 669 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 670 {
 671         struct net *net = geneve->net;
 672         struct geneve_net *gn = net_generic(net, geneve_net_id);
 673         struct geneve_dev_node *node;
 674         struct geneve_sock *gs;
 675         __u8 vni[3];
 676         __u32 hash;
 677
 678         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
 679         if (gs) {
 680                 gs->refcnt++;
 681                 goto out;
 682         }
 683
 684         gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
 685                                   geneve->cfg.use_udp6_rx_checksums);
 686         if (IS_ERR(gs))
 687                 return PTR_ERR(gs);
 688
 689 out:
 690         gs->collect_md = geneve->cfg.collect_md;
 691 #if IS_ENABLED(CONFIG_IPV6)
 692         if (ipv6) {
 693                 rcu_assign_pointer(geneve->sock6, gs);
 694                 node = &geneve->hlist6;
 695         } else
 696 #endif
 697         {
 698                 rcu_assign_pointer(geneve->sock4, gs);
 699                 node = &geneve->hlist4;
 700         }
 701         node->geneve = geneve;
 702
 703         tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
 704         hash = geneve_net_vni_hash(vni);
 705         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 706         return 0;
 707 }
 708
 709 static int geneve_open(struct net_device *dev)
 710 {
 711         struct geneve_dev *geneve = netdev_priv(dev);
 712         bool metadata = geneve->cfg.collect_md;
 713         bool ipv4, ipv6;
 714         int ret = 0;
 715
 716         ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
 717         ipv4 = !ipv6 || metadata;
 718 #if IS_ENABLED(CONFIG_IPV6)
 719         if (ipv6) {
 720                 ret = geneve_sock_add(geneve, true);
 721                 if (ret < 0 && ret != -EAFNOSUPPORT)
 722                         ipv4 = false;
 723         }
 724 #endif
 725         if (ipv4)
 726                 ret = geneve_sock_add(geneve, false);
 727         if (ret < 0)
 728                 geneve_sock_release(geneve);
 729
 730         return ret;
 731 }
 732
 733 static int geneve_stop(struct net_device *dev)
 734 {
 735         struct geneve_dev *geneve = netdev_priv(dev);
 736
 737         hlist_del_init_rcu(&geneve->hlist4.hlist);
 738 #if IS_ENABLED(CONFIG_IPV6)
 739         hlist_del_init_rcu(&geneve->hlist6.hlist);
 740 #endif
 741         geneve_sock_release(geneve);
 742         return 0;
 743 }
 744
 745 static void geneve_build_header(struct genevehdr *geneveh,
 746                                 const struct ip_tunnel_info *info,
 747                                 __be16 inner_proto)
 748 {
 749         geneveh->ver = GENEVE_VER;
 750         geneveh->opt_len = info->options_len / 4;
 751         geneveh->oam = test_bit(IP_TUNNEL_OAM_BIT, info->key.tun_flags);
 752         geneveh->critical = test_bit(IP_TUNNEL_CRIT_OPT_BIT,
 753                                      info->key.tun_flags);
 754         geneveh->rsvd1 = 0;
 755         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 756         geneveh->proto_type = inner_proto;
 757         geneveh->rsvd2 = 0;
 758
 759         if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags))
 760                 ip_tunnel_info_opts_get(geneveh->options, info);
 761 }
 762
 763 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 764                             const struct ip_tunnel_info *info,
 765                             bool xnet, int ip_hdr_len,
 766                             bool inner_proto_inherit)
 767 {
 768         bool udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags);
 769         struct genevehdr *gnvh;
 770         __be16 inner_proto;
 771         int min_headroom;
 772         int err;
 773
 774         skb_reset_mac_header(skb);
 775         skb_scrub_packet(skb, xnet);
 776
 777         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 778                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 779         err = skb_cow_head(skb, min_headroom);
 780         if (unlikely(err))
 781                 goto free_dst;
 782
 783         err = udp_tunnel_handle_offloads(skb, udp_sum);
 784         if (err)
 785                 goto free_dst;
 786
 787         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 788         inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB);
 789         geneve_build_header(gnvh, info, inner_proto);
 790         skb_set_inner_protocol(skb, inner_proto);
 791         return 0;
 792
 793 free_dst:
 794         dst_release(dst);
 795         return err;
 796 }
 797
 798 static u8 geneve_get_dsfield(struct sk_buff *skb, struct net_device *dev,
 799                              const struct ip_tunnel_info *info,
 800                              bool *use_cache)
 801 {
 802         struct geneve_dev *geneve = netdev_priv(dev);
 803         u8 dsfield;
 804
 805         dsfield = info->key.tos;
 806         if (dsfield == 1 && !geneve->cfg.collect_md) {
 807                 dsfield = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 808                 *use_cache = false;
 809         }
 810
 811         return dsfield;
 812 }
 813
 814 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 815                            struct geneve_dev *geneve,
 816                            const struct ip_tunnel_info *info)
 817 {
 818         bool inner_proto_inherit = geneve->cfg.inner_proto_inherit;
 819         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 820         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 821         const struct ip_tunnel_key *key = &info->key;
 822         struct rtable *rt;
 823         bool use_cache;
 824         __u8 tos, ttl;
 825         __be16 df = 0;
 826         __be32 saddr;
 827         __be16 sport;
 828         int err;
 829
 830         if (skb_vlan_inet_prepare(skb, inner_proto_inherit))
 831                 return -EINVAL;
 832
 833         if (!gs4)
 834                 return -EIO;
 835
 836         use_cache = ip_tunnel_dst_cache_usable(skb, info);
 837         tos = geneve_get_dsfield(skb, dev, info, &use_cache);
 838         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 839
 840         rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr,
 841                                    &info->key,
 842                                    sport, geneve->cfg.info.key.tp_dst, tos,
 843                                    use_cache ?
 844                                    (struct dst_cache *)&info->dst_cache : NULL);
 845         if (IS_ERR(rt))
 846                 return PTR_ERR(rt);
 847
 848         err = skb_tunnel_check_pmtu(skb, &rt->dst,
 849                                     GENEVE_IPV4_HLEN + info->options_len,
 850                                     netif_is_any_bridge_port(dev));
 851         if (err < 0) {
 852                 dst_release(&rt->dst);
 853                 return err;
 854         } else if (err) {
 855                 struct ip_tunnel_info *info;
 856
 857                 info = skb_tunnel_info(skb);
 858                 if (info) {
 859                         struct ip_tunnel_info *unclone;
 860
 861                         unclone = skb_tunnel_info_unclone(skb);
 862                         if (unlikely(!unclone)) {
 863                                 dst_release(&rt->dst);
 864                                 return -ENOMEM;
 865                         }
 866
 867                         unclone->key.u.ipv4.dst = saddr;
 868                         unclone->key.u.ipv4.src = info->key.u.ipv4.dst;
 869                 }
 870
 871                 if (!pskb_may_pull(skb, ETH_HLEN)) {
 872                         dst_release(&rt->dst);
 873                         return -EINVAL;
 874                 }
 875
 876                 skb->protocol = eth_type_trans(skb, geneve->dev);
 877                 __netif_rx(skb);
 878                 dst_release(&rt->dst);
 879                 return -EMSGSIZE;
 880         }
 881
 882         tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb);
 883         if (geneve->cfg.collect_md) {
 884                 ttl = key->ttl;
 885
 886                 df = test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, key->tun_flags) ?
 887                      htons(IP_DF) : 0;
 888         } else {
 889                 if (geneve->cfg.ttl_inherit)
 890                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 891                 else
 892                         ttl = key->ttl;
 893                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 894
 895                 if (geneve->cfg.df == GENEVE_DF_SET) {
 896                         df = htons(IP_DF);
 897                 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
 898                         struct ethhdr *eth = skb_eth_hdr(skb);
 899
 900                         if (ntohs(eth->h_proto) == ETH_P_IPV6) {
 901                                 df = htons(IP_DF);
 902                         } else if (ntohs(eth->h_proto) == ETH_P_IP) {
 903                                 struct iphdr *iph = ip_hdr(skb);
 904
 905                                 if (iph->frag_off & htons(IP_DF))
 906                                         df = htons(IP_DF);
 907                         }
 908                 }
 909         }
 910
 911         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr),
 912                                inner_proto_inherit);
 913         if (unlikely(err))
 914                 return err;
 915
 916         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, saddr, info->key.u.ipv4.dst,
 917                             tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
 918                             !net_eq(geneve->net, dev_net(geneve->dev)),
 919                             !test_bit(IP_TUNNEL_CSUM_BIT,
 920                                       info->key.tun_flags));
 921         return 0;
 922 }
 923
 924 #if IS_ENABLED(CONFIG_IPV6)
 925 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 926                             struct geneve_dev *geneve,
 927                             const struct ip_tunnel_info *info)
 928 {
 929         bool inner_proto_inherit = geneve->cfg.inner_proto_inherit;
 930         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 931         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 932         const struct ip_tunnel_key *key = &info->key;
 933         struct dst_entry *dst = NULL;
 934         struct in6_addr saddr;
 935         bool use_cache;
 936         __u8 prio, ttl;
 937         __be16 sport;
 938         int err;
 939
 940         if (skb_vlan_inet_prepare(skb, inner_proto_inherit))
 941                 return -EINVAL;
 942
 943         if (!gs6)
 944                 return -EIO;
 945
 946         use_cache = ip_tunnel_dst_cache_usable(skb, info);
 947         prio = geneve_get_dsfield(skb, dev, info, &use_cache);
 948         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 949
 950         dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0,
 951                                      &saddr, key, sport,
 952                                      geneve->cfg.info.key.tp_dst, prio,
 953                                      use_cache ?
 954                                      (struct dst_cache *)&info->dst_cache : NULL);
 955         if (IS_ERR(dst))
 956                 return PTR_ERR(dst);
 957
 958         err = skb_tunnel_check_pmtu(skb, dst,
 959                                     GENEVE_IPV6_HLEN + info->options_len,
 960                                     netif_is_any_bridge_port(dev));
 961         if (err < 0) {
 962                 dst_release(dst);
 963                 return err;
 964         } else if (err) {
 965                 struct ip_tunnel_info *info = skb_tunnel_info(skb);
 966
 967                 if (info) {
 968                         struct ip_tunnel_info *unclone;
 969
 970                         unclone = skb_tunnel_info_unclone(skb);
 971                         if (unlikely(!unclone)) {
 972                                 dst_release(dst);
 973                                 return -ENOMEM;
 974                         }
 975
 976                         unclone->key.u.ipv6.dst = saddr;
 977                         unclone->key.u.ipv6.src = info->key.u.ipv6.dst;
 978                 }
 979
 980                 if (!pskb_may_pull(skb, ETH_HLEN)) {
 981                         dst_release(dst);
 982                         return -EINVAL;
 983                 }
 984
 985                 skb->protocol = eth_type_trans(skb, geneve->dev);
 986                 __netif_rx(skb);
 987                 dst_release(dst);
 988                 return -EMSGSIZE;
 989         }
 990
 991         prio = ip_tunnel_ecn_encap(prio, ip_hdr(skb), skb);
 992         if (geneve->cfg.collect_md) {
 993                 ttl = key->ttl;
 994         } else {
 995                 if (geneve->cfg.ttl_inherit)
 996                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 997                 else
 998                         ttl = key->ttl;
 999                 ttl = ttl ? : ip6_dst_hoplimit(dst);
1000         }
1001         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr),
1002                                inner_proto_inherit);
1003         if (unlikely(err))
1004                 return err;
1005
1006         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1007                              &saddr, &key->u.ipv6.dst, prio, ttl,
1008                              info->key.label, sport, geneve->cfg.info.key.tp_dst,
1009                              !test_bit(IP_TUNNEL_CSUM_BIT,
1010                                        info->key.tun_flags));
1011         return 0;
1012 }
1013 #endif
1014
1015 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1016 {
1017         struct geneve_dev *geneve = netdev_priv(dev);
1018         struct ip_tunnel_info *info = NULL;
1019         int err;
1020
1021         if (geneve->cfg.collect_md) {
1022                 info = skb_tunnel_info(skb);
1023                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1024                         netdev_dbg(dev, "no tunnel metadata\n");
1025                         dev_kfree_skb(skb);
1026                         DEV_STATS_INC(dev, tx_dropped);
1027                         return NETDEV_TX_OK;
1028                 }
1029         } else {
1030                 info = &geneve->cfg.info;
1031         }
1032
1033         rcu_read_lock();
1034 #if IS_ENABLED(CONFIG_IPV6)
1035         if (info->mode & IP_TUNNEL_INFO_IPV6)
1036                 err = geneve6_xmit_skb(skb, dev, geneve, info);
1037         else
1038 #endif
1039                 err = geneve_xmit_skb(skb, dev, geneve, info);
1040         rcu_read_unlock();
1041
1042         if (likely(!err))
1043                 return NETDEV_TX_OK;
1044
1045         if (err != -EMSGSIZE)
1046                 dev_kfree_skb(skb);
1047
1048         if (err == -ELOOP)
1049                 DEV_STATS_INC(dev, collisions);
1050         else if (err == -ENETUNREACH)
1051                 DEV_STATS_INC(dev, tx_carrier_errors);
1052
1053         DEV_STATS_INC(dev, tx_errors);
1054         return NETDEV_TX_OK;
1055 }
1056
1057 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1058 {
1059         if (new_mtu > dev->max_mtu)
1060                 new_mtu = dev->max_mtu;
1061         else if (new_mtu < dev->min_mtu)
1062                 new_mtu = dev->min_mtu;
1063
1064         WRITE_ONCE(dev->mtu, new_mtu);
1065         return 0;
1066 }
1067
1068 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1069 {
1070         struct ip_tunnel_info *info = skb_tunnel_info(skb);
1071         struct geneve_dev *geneve = netdev_priv(dev);
1072         __be16 sport;
1073
1074         if (ip_tunnel_info_af(info) == AF_INET) {
1075                 struct rtable *rt;
1076                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1077                 bool use_cache;
1078                 __be32 saddr;
1079                 u8 tos;
1080
1081                 if (!gs4)
1082                         return -EIO;
1083
1084                 use_cache = ip_tunnel_dst_cache_usable(skb, info);
1085                 tos = geneve_get_dsfield(skb, dev, info, &use_cache);
1086                 sport = udp_flow_src_port(geneve->net, skb,
1087                                           1, USHRT_MAX, true);
1088
1089                 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr,
1090                                            &info->key,
1091                                            sport, geneve->cfg.info.key.tp_dst,
1092                                            tos,
1093                                            use_cache ? &info->dst_cache : NULL);
1094                 if (IS_ERR(rt))
1095                         return PTR_ERR(rt);
1096
1097                 ip_rt_put(rt);
1098                 info->key.u.ipv4.src = saddr;
1099 #if IS_ENABLED(CONFIG_IPV6)
1100         } else if (ip_tunnel_info_af(info) == AF_INET6) {
1101                 struct dst_entry *dst;
1102                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1103                 struct in6_addr saddr;
1104                 bool use_cache;
1105                 u8 prio;
1106
1107                 if (!gs6)
1108                         return -EIO;
1109
1110                 use_cache = ip_tunnel_dst_cache_usable(skb, info);
1111                 prio = geneve_get_dsfield(skb, dev, info, &use_cache);
1112                 sport = udp_flow_src_port(geneve->net, skb,
1113                                           1, USHRT_MAX, true);
1114
1115                 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0,
1116                                              &saddr, &info->key, sport,
1117                                              geneve->cfg.info.key.tp_dst, prio,
1118                                              use_cache ? &info->dst_cache : NULL);
1119                 if (IS_ERR(dst))
1120                         return PTR_ERR(dst);
1121
1122                 dst_release(dst);
1123                 info->key.u.ipv6.src = saddr;
1124 #endif
1125         } else {
1126                 return -EINVAL;
1127         }
1128
1129         info->key.tp_src = sport;
1130         info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1131         return 0;
1132 }
1133
1134 static const struct net_device_ops geneve_netdev_ops = {
1135         .ndo_init               = geneve_init,
1136         .ndo_uninit             = geneve_uninit,
1137         .ndo_open               = geneve_open,
1138         .ndo_stop               = geneve_stop,
1139         .ndo_start_xmit         = geneve_xmit,
1140         .ndo_change_mtu         = geneve_change_mtu,
1141         .ndo_validate_addr      = eth_validate_addr,
1142         .ndo_set_mac_address    = eth_mac_addr,
1143         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1144 };
1145
1146 static void geneve_get_drvinfo(struct net_device *dev,
1147                                struct ethtool_drvinfo *drvinfo)
1148 {
1149         strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1150         strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1151 }
1152
1153 static const struct ethtool_ops geneve_ethtool_ops = {
1154         .get_drvinfo    = geneve_get_drvinfo,
1155         .get_link       = ethtool_op_get_link,
1156 };
1157
1158 /* Info for udev, that this is a virtual tunnel endpoint */
1159 static const struct device_type geneve_type = {
1160         .name = "geneve",
1161 };
1162
1163 /* Calls the ndo_udp_tunnel_add of the caller in order to
1164  * supply the listening GENEVE udp ports. Callers are expected
1165  * to implement the ndo_udp_tunnel_add.
1166  */
1167 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1168 {
1169         struct net *net = dev_net(dev);
1170         struct geneve_net *gn = net_generic(net, geneve_net_id);
1171         struct geneve_sock *gs;
1172
1173         rcu_read_lock();
1174         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1175                 if (push) {
1176                         udp_tunnel_push_rx_port(dev, gs->sock,
1177                                                 UDP_TUNNEL_TYPE_GENEVE);
1178                 } else {
1179                         udp_tunnel_drop_rx_port(dev, gs->sock,
1180                                                 UDP_TUNNEL_TYPE_GENEVE);
1181                 }
1182         }
1183         rcu_read_unlock();
1184 }
1185
1186 /* Initialize the device structure. */
1187 static void geneve_setup(struct net_device *dev)
1188 {
1189         ether_setup(dev);
1190
1191         dev->netdev_ops = &geneve_netdev_ops;
1192         dev->ethtool_ops = &geneve_ethtool_ops;
1193         dev->needs_free_netdev = true;
1194
1195         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1196
1197         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1198         dev->features    |= NETIF_F_RXCSUM;
1199         dev->features    |= NETIF_F_GSO_SOFTWARE;
1200
1201         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1202         dev->hw_features |= NETIF_F_RXCSUM;
1203         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1204
1205         dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1206         /* MTU range: 68 - (something less than 65535) */
1207         dev->min_mtu = ETH_MIN_MTU;
1208         /* The max_mtu calculation does not take account of GENEVE
1209          * options, to avoid excluding potentially valid
1210          * configurations. This will be further reduced by IPvX hdr size.
1211          */
1212         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1213
1214         netif_keep_dst(dev);
1215         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1216         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1217         dev->lltx = true;
1218         eth_hw_addr_random(dev);
1219 }
1220
1221 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1222         [IFLA_GENEVE_UNSPEC]            = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT },
1223         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1224         [IFLA_GENEVE_REMOTE]            = { .len = sizeof_field(struct iphdr, daddr) },
1225         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1226         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1227         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1228         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1229         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1230         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1231         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1232         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1233         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1234         [IFLA_GENEVE_TTL_INHERIT]       = { .type = NLA_U8 },
1235         [IFLA_GENEVE_DF]                = { .type = NLA_U8 },
1236         [IFLA_GENEVE_INNER_PROTO_INHERIT]       = { .type = NLA_FLAG },
1237 };
1238
1239 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1240                            struct netlink_ext_ack *extack)
1241 {
1242         if (tb[IFLA_ADDRESS]) {
1243                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1244                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1245                                             "Provided link layer address is not Ethernet");
1246                         return -EINVAL;
1247                 }
1248
1249                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1250                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1251                                             "Provided Ethernet address is not unicast");
1252                         return -EADDRNOTAVAIL;
1253                 }
1254         }
1255
1256         if (!data) {
1257                 NL_SET_ERR_MSG(extack,
1258                                "Not enough attributes provided to perform the operation");
1259                 return -EINVAL;
1260         }
1261
1262         if (data[IFLA_GENEVE_ID]) {
1263                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1264
1265                 if (vni >= GENEVE_N_VID) {
1266                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1267                                             "Geneve ID must be lower than 16777216");
1268                         return -ERANGE;
1269                 }
1270         }
1271
1272         if (data[IFLA_GENEVE_DF]) {
1273                 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1274
1275                 if (df < 0 || df > GENEVE_DF_MAX) {
1276                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1277                                             "Invalid DF attribute");
1278                         return -EINVAL;
1279                 }
1280         }
1281
1282         return 0;
1283 }
1284
1285 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1286                                           const struct ip_tunnel_info *info,
1287                                           bool *tun_on_same_port,
1288                                           bool *tun_collect_md)
1289 {
1290         struct geneve_dev *geneve, *t = NULL;
1291
1292         *tun_on_same_port = false;
1293         *tun_collect_md = false;
1294         list_for_each_entry(geneve, &gn->geneve_list, next) {
1295                 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1296                         *tun_collect_md = geneve->cfg.collect_md;
1297                         *tun_on_same_port = true;
1298                 }
1299                 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1300                     info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1301                     !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1302                         t = geneve;
1303         }
1304         return t;
1305 }
1306
1307 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1308 {
1309         return !(info->key.tun_id || info->key.tos ||
1310                  !ip_tunnel_flags_empty(info->key.tun_flags) ||
1311                  info->key.ttl || info->key.label || info->key.tp_src ||
1312                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1313 }
1314
1315 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1316                                   struct ip_tunnel_info *b)
1317 {
1318         if (ip_tunnel_info_af(a) == AF_INET)
1319                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1320         else
1321                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1322 }
1323
1324 static int geneve_configure(struct net *net, struct net_device *dev,
1325                             struct netlink_ext_ack *extack,
1326                             const struct geneve_config *cfg)
1327 {
1328         struct geneve_net *gn = net_generic(net, geneve_net_id);
1329         struct geneve_dev *t, *geneve = netdev_priv(dev);
1330         const struct ip_tunnel_info *info = &cfg->info;
1331         bool tun_collect_md, tun_on_same_port;
1332         int err, encap_len;
1333
1334         if (cfg->collect_md && !is_tnl_info_zero(info)) {
1335                 NL_SET_ERR_MSG(extack,
1336                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1337                 return -EINVAL;
1338         }
1339
1340         geneve->net = net;
1341         geneve->dev = dev;
1342
1343         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1344         if (t)
1345                 return -EBUSY;
1346
1347         /* make enough headroom for basic scenario */
1348         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1349         if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1350                 encap_len += sizeof(struct iphdr);
1351                 dev->max_mtu -= sizeof(struct iphdr);
1352         } else {
1353                 encap_len += sizeof(struct ipv6hdr);
1354                 dev->max_mtu -= sizeof(struct ipv6hdr);
1355         }
1356         dev->needed_headroom = encap_len + ETH_HLEN;
1357
1358         if (cfg->collect_md) {
1359                 if (tun_on_same_port) {
1360                         NL_SET_ERR_MSG(extack,
1361                                        "There can be only one externally controlled device on a destination port");
1362                         return -EPERM;
1363                 }
1364         } else {
1365                 if (tun_collect_md) {
1366                         NL_SET_ERR_MSG(extack,
1367                                        "There already exists an externally controlled device on this destination port");
1368                         return -EPERM;
1369                 }
1370         }
1371
1372         dst_cache_reset(&geneve->cfg.info.dst_cache);
1373         memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1374
1375         if (geneve->cfg.inner_proto_inherit) {
1376                 dev->header_ops = NULL;
1377                 dev->type = ARPHRD_NONE;
1378                 dev->hard_header_len = 0;
1379                 dev->addr_len = 0;
1380                 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1381         }
1382
1383         err = register_netdevice(dev);
1384         if (err)
1385                 return err;
1386
1387         list_add(&geneve->next, &gn->geneve_list);
1388         return 0;
1389 }
1390
1391 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1392 {
1393         memset(info, 0, sizeof(*info));
1394         info->key.tp_dst = htons(dst_port);
1395 }
1396
1397 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1398                           struct netlink_ext_ack *extack,
1399                           struct geneve_config *cfg, bool changelink)
1400 {
1401         struct ip_tunnel_info *info = &cfg->info;
1402         int attrtype;
1403
1404         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1405                 NL_SET_ERR_MSG(extack,
1406                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1407                 return -EINVAL;
1408         }
1409
1410         if (data[IFLA_GENEVE_REMOTE]) {
1411                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1412                         attrtype = IFLA_GENEVE_REMOTE;
1413                         goto change_notsup;
1414                 }
1415
1416                 info->key.u.ipv4.dst =
1417                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1418
1419                 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1420                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1421                                             "Remote IPv4 address cannot be Multicast");
1422                         return -EINVAL;
1423                 }
1424         }
1425
1426         if (data[IFLA_GENEVE_REMOTE6]) {
1427 #if IS_ENABLED(CONFIG_IPV6)
1428                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1429                         attrtype = IFLA_GENEVE_REMOTE6;
1430                         goto change_notsup;
1431                 }
1432
1433                 info->mode = IP_TUNNEL_INFO_IPV6;
1434                 info->key.u.ipv6.dst =
1435                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1436
1437                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1438                     IPV6_ADDR_LINKLOCAL) {
1439                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1440                                             "Remote IPv6 address cannot be link-local");
1441                         return -EINVAL;
1442                 }
1443                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1444                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1445                                             "Remote IPv6 address cannot be Multicast");
1446                         return -EINVAL;
1447                 }
1448                 __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags);
1449                 cfg->use_udp6_rx_checksums = true;
1450 #else
1451                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1452                                     "IPv6 support not enabled in the kernel");
1453                 return -EPFNOSUPPORT;
1454 #endif
1455         }
1456
1457         if (data[IFLA_GENEVE_ID]) {
1458                 __u32 vni;
1459                 __u8 tvni[3];
1460                 __be64 tunid;
1461
1462                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1463                 tvni[0] = (vni & 0x00ff0000) >> 16;
1464                 tvni[1] = (vni & 0x0000ff00) >> 8;
1465                 tvni[2] =  vni & 0x000000ff;
1466
1467                 tunid = vni_to_tunnel_id(tvni);
1468                 if (changelink && (tunid != info->key.tun_id)) {
1469                         attrtype = IFLA_GENEVE_ID;
1470                         goto change_notsup;
1471                 }
1472                 info->key.tun_id = tunid;
1473         }
1474
1475         if (data[IFLA_GENEVE_TTL_INHERIT]) {
1476                 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1477                         cfg->ttl_inherit = true;
1478                 else
1479                         cfg->ttl_inherit = false;
1480         } else if (data[IFLA_GENEVE_TTL]) {
1481                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1482                 cfg->ttl_inherit = false;
1483         }
1484
1485         if (data[IFLA_GENEVE_TOS])
1486                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1487
1488         if (data[IFLA_GENEVE_DF])
1489                 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1490
1491         if (data[IFLA_GENEVE_LABEL]) {
1492                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1493                                   IPV6_FLOWLABEL_MASK;
1494                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1495                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1496                                             "Label attribute only applies for IPv6 Geneve devices");
1497                         return -EINVAL;
1498                 }
1499         }
1500
1501         if (data[IFLA_GENEVE_PORT]) {
1502                 if (changelink) {
1503                         attrtype = IFLA_GENEVE_PORT;
1504                         goto change_notsup;
1505                 }
1506                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1507         }
1508
1509         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1510                 if (changelink) {
1511                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1512                         goto change_notsup;
1513                 }
1514                 cfg->collect_md = true;
1515         }
1516
1517         if (data[IFLA_GENEVE_UDP_CSUM]) {
1518                 if (changelink) {
1519                         attrtype = IFLA_GENEVE_UDP_CSUM;
1520                         goto change_notsup;
1521                 }
1522                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1523                         __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags);
1524         }
1525
1526         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1527 #if IS_ENABLED(CONFIG_IPV6)
1528                 if (changelink) {
1529                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1530                         goto change_notsup;
1531                 }
1532                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1533                         __clear_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags);
1534 #else
1535                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1536                                     "IPv6 support not enabled in the kernel");
1537                 return -EPFNOSUPPORT;
1538 #endif
1539         }
1540
1541         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1542 #if IS_ENABLED(CONFIG_IPV6)
1543                 if (changelink) {
1544                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1545                         goto change_notsup;
1546                 }
1547                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1548                         cfg->use_udp6_rx_checksums = false;
1549 #else
1550                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1551                                     "IPv6 support not enabled in the kernel");
1552                 return -EPFNOSUPPORT;
1553 #endif
1554         }
1555
1556         if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) {
1557                 if (changelink) {
1558                         attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT;
1559                         goto change_notsup;
1560                 }
1561                 cfg->inner_proto_inherit = true;
1562         }
1563
1564         return 0;
1565 change_notsup:
1566         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1567                             "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported");
1568         return -EOPNOTSUPP;
1569 }
1570
1571 static void geneve_link_config(struct net_device *dev,
1572                                struct ip_tunnel_info *info, struct nlattr *tb[])
1573 {
1574         struct geneve_dev *geneve = netdev_priv(dev);
1575         int ldev_mtu = 0;
1576
1577         if (tb[IFLA_MTU]) {
1578                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1579                 return;
1580         }
1581
1582         switch (ip_tunnel_info_af(info)) {
1583         case AF_INET: {
1584                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1585                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1586
1587                 if (!IS_ERR(rt) && rt->dst.dev) {
1588                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1589                         ip_rt_put(rt);
1590                 }
1591                 break;
1592         }
1593 #if IS_ENABLED(CONFIG_IPV6)
1594         case AF_INET6: {
1595                 struct rt6_info *rt;
1596
1597                 if (!__in6_dev_get(dev))
1598                         break;
1599
1600                 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1601                                 NULL, 0);
1602
1603                 if (rt && rt->dst.dev)
1604                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1605                 ip6_rt_put(rt);
1606                 break;
1607         }
1608 #endif
1609         }
1610
1611         if (ldev_mtu <= 0)
1612                 return;
1613
1614         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1615 }
1616
1617 static int geneve_newlink(struct net *net, struct net_device *dev,
1618                           struct nlattr *tb[], struct nlattr *data[],
1619                           struct netlink_ext_ack *extack)
1620 {
1621         struct geneve_config cfg = {
1622                 .df = GENEVE_DF_UNSET,
1623                 .use_udp6_rx_checksums = false,
1624                 .ttl_inherit = false,
1625                 .collect_md = false,
1626         };
1627         int err;
1628
1629         init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1630         err = geneve_nl2info(tb, data, extack, &cfg, false);
1631         if (err)
1632                 return err;
1633
1634         err = geneve_configure(net, dev, extack, &cfg);
1635         if (err)
1636                 return err;
1637
1638         geneve_link_config(dev, &cfg.info, tb);
1639
1640         return 0;
1641 }
1642
1643 /* Quiesces the geneve device data path for both TX and RX.
1644  *
1645  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1646  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1647  * to complete for the existing set of in-flight packets to be transmitted,
1648  * then we would have quiesced the transmit data path. All the future packets
1649  * will get dropped until we unquiesce the data path.
1650  *
1651  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1652  * if we set that to NULL under RCU and wait for synchronize_net() to
1653  * complete, then we would have quiesced the receive data path.
1654  */
1655 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1656                            struct geneve_sock **gs6)
1657 {
1658         *gs4 = rtnl_dereference(geneve->sock4);
1659         rcu_assign_pointer(geneve->sock4, NULL);
1660         if (*gs4)
1661                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1662 #if IS_ENABLED(CONFIG_IPV6)
1663         *gs6 = rtnl_dereference(geneve->sock6);
1664         rcu_assign_pointer(geneve->sock6, NULL);
1665         if (*gs6)
1666                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1667 #else
1668         *gs6 = NULL;
1669 #endif
1670         synchronize_net();
1671 }
1672
1673 /* Resumes the geneve device data path for both TX and RX. */
1674 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1675                              struct geneve_sock __maybe_unused *gs6)
1676 {
1677         rcu_assign_pointer(geneve->sock4, gs4);
1678         if (gs4)
1679                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1680 #if IS_ENABLED(CONFIG_IPV6)
1681         rcu_assign_pointer(geneve->sock6, gs6);
1682         if (gs6)
1683                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1684 #endif
1685         synchronize_net();
1686 }
1687
1688 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1689                              struct nlattr *data[],
1690                              struct netlink_ext_ack *extack)
1691 {
1692         struct geneve_dev *geneve = netdev_priv(dev);
1693         struct geneve_sock *gs4, *gs6;
1694         struct geneve_config cfg;
1695         int err;
1696
1697         /* If the geneve device is configured for metadata (or externally
1698          * controlled, for example, OVS), then nothing can be changed.
1699          */
1700         if (geneve->cfg.collect_md)
1701                 return -EOPNOTSUPP;
1702
1703         /* Start with the existing info. */
1704         memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1705         err = geneve_nl2info(tb, data, extack, &cfg, true);
1706         if (err)
1707                 return err;
1708
1709         if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1710                 dst_cache_reset(&cfg.info.dst_cache);
1711                 geneve_link_config(dev, &cfg.info, tb);
1712         }
1713
1714         geneve_quiesce(geneve, &gs4, &gs6);
1715         memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1716         geneve_unquiesce(geneve, gs4, gs6);
1717
1718         return 0;
1719 }
1720
1721 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1722 {
1723         struct geneve_dev *geneve = netdev_priv(dev);
1724
1725         list_del(&geneve->next);
1726         unregister_netdevice_queue(dev, head);
1727 }
1728
1729 static size_t geneve_get_size(const struct net_device *dev)
1730 {
1731         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1732                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1733                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1734                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1735                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_DF */
1736                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1737                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1738                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1739                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1740                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1741                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1742                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1743                 nla_total_size(0) +      /* IFLA_GENEVE_INNER_PROTO_INHERIT */
1744                 0;
1745 }
1746
1747 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1748 {
1749         struct geneve_dev *geneve = netdev_priv(dev);
1750         struct ip_tunnel_info *info = &geneve->cfg.info;
1751         bool ttl_inherit = geneve->cfg.ttl_inherit;
1752         bool metadata = geneve->cfg.collect_md;
1753         __u8 tmp_vni[3];
1754         __u32 vni;
1755
1756         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1757         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1758         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1759                 goto nla_put_failure;
1760
1761         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1762                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1763                                     info->key.u.ipv4.dst))
1764                         goto nla_put_failure;
1765                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1766                                test_bit(IP_TUNNEL_CSUM_BIT,
1767                                         info->key.tun_flags)))
1768                         goto nla_put_failure;
1769
1770 #if IS_ENABLED(CONFIG_IPV6)
1771         } else if (!metadata) {
1772                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1773                                      &info->key.u.ipv6.dst))
1774                         goto nla_put_failure;
1775                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1776                                !test_bit(IP_TUNNEL_CSUM_BIT,
1777                                          info->key.tun_flags)))
1778                         goto nla_put_failure;
1779 #endif
1780         }
1781
1782         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1783             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1784             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1785                 goto nla_put_failure;
1786
1787         if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1788                 goto nla_put_failure;
1789
1790         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1791                 goto nla_put_failure;
1792
1793         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1794                 goto nla_put_failure;
1795
1796 #if IS_ENABLED(CONFIG_IPV6)
1797         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1798                        !geneve->cfg.use_udp6_rx_checksums))
1799                 goto nla_put_failure;
1800 #endif
1801
1802         if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1803                 goto nla_put_failure;
1804
1805         if (geneve->cfg.inner_proto_inherit &&
1806             nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT))
1807                 goto nla_put_failure;
1808
1809         return 0;
1810
1811 nla_put_failure:
1812         return -EMSGSIZE;
1813 }
1814
1815 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1816         .kind           = "geneve",
1817         .maxtype        = IFLA_GENEVE_MAX,
1818         .policy         = geneve_policy,
1819         .priv_size      = sizeof(struct geneve_dev),
1820         .setup          = geneve_setup,
1821         .validate       = geneve_validate,
1822         .newlink        = geneve_newlink,
1823         .changelink     = geneve_changelink,
1824         .dellink        = geneve_dellink,
1825         .get_size       = geneve_get_size,
1826         .fill_info      = geneve_fill_info,
1827 };
1828
1829 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1830                                         u8 name_assign_type, u16 dst_port)
1831 {
1832         struct nlattr *tb[IFLA_MAX + 1];
1833         struct net_device *dev;
1834         LIST_HEAD(list_kill);
1835         int err;
1836         struct geneve_config cfg = {
1837                 .df = GENEVE_DF_UNSET,
1838                 .use_udp6_rx_checksums = true,
1839                 .ttl_inherit = false,
1840                 .collect_md = true,
1841         };
1842
1843         memset(tb, 0, sizeof(tb));
1844         dev = rtnl_create_link(net, name, name_assign_type,
1845                                &geneve_link_ops, tb, NULL);
1846         if (IS_ERR(dev))
1847                 return dev;
1848
1849         init_tnl_info(&cfg.info, dst_port);
1850         err = geneve_configure(net, dev, NULL, &cfg);
1851         if (err) {
1852                 free_netdev(dev);
1853                 return ERR_PTR(err);
1854         }
1855
1856         /* openvswitch users expect packet sizes to be unrestricted,
1857          * so set the largest MTU we can.
1858          */
1859         err = geneve_change_mtu(dev, IP_MAX_MTU);
1860         if (err)
1861                 goto err;
1862
1863         err = rtnl_configure_link(dev, NULL, 0, NULL);
1864         if (err < 0)
1865                 goto err;
1866
1867         return dev;
1868 err:
1869         geneve_dellink(dev, &list_kill);
1870         unregister_netdevice_many(&list_kill);
1871         return ERR_PTR(err);
1872 }
1873 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1874
1875 static int geneve_netdevice_event(struct notifier_block *unused,
1876                                   unsigned long event, void *ptr)
1877 {
1878         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1879
1880         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1881                 geneve_offload_rx_ports(dev, true);
1882         else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
1883                 geneve_offload_rx_ports(dev, false);
1884
1885         return NOTIFY_DONE;
1886 }
1887
1888 static struct notifier_block geneve_notifier_block __read_mostly = {
1889         .notifier_call = geneve_netdevice_event,
1890 };
1891
1892 static __net_init int geneve_init_net(struct net *net)
1893 {
1894         struct geneve_net *gn = net_generic(net, geneve_net_id);
1895
1896         INIT_LIST_HEAD(&gn->geneve_list);
1897         INIT_LIST_HEAD(&gn->sock_list);
1898         return 0;
1899 }
1900
1901 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1902 {
1903         struct geneve_net *gn = net_generic(net, geneve_net_id);
1904         struct geneve_dev *geneve, *next;
1905         struct net_device *dev, *aux;
1906
1907         /* gather any geneve devices that were moved into this ns */
1908         for_each_netdev_safe(net, dev, aux)
1909                 if (dev->rtnl_link_ops == &geneve_link_ops)
1910                         unregister_netdevice_queue(dev, head);
1911
1912         /* now gather any other geneve devices that were created in this ns */
1913         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1914                 /* If geneve->dev is in the same netns, it was already added
1915                  * to the list by the previous loop.
1916                  */
1917                 if (!net_eq(dev_net(geneve->dev), net))
1918                         unregister_netdevice_queue(geneve->dev, head);
1919         }
1920 }
1921
1922 static void __net_exit geneve_exit_batch_rtnl(struct list_head *net_list,
1923                                               struct list_head *dev_to_kill)
1924 {
1925         struct net *net;
1926
1927         list_for_each_entry(net, net_list, exit_list)
1928                 geneve_destroy_tunnels(net, dev_to_kill);
1929 }
1930
1931 static void __net_exit geneve_exit_net(struct net *net)
1932 {
1933         const struct geneve_net *gn = net_generic(net, geneve_net_id);
1934
1935         WARN_ON_ONCE(!list_empty(&gn->sock_list));
1936 }
1937
1938 static struct pernet_operations geneve_net_ops = {
1939         .init = geneve_init_net,
1940         .exit_batch_rtnl = geneve_exit_batch_rtnl,
1941         .exit = geneve_exit_net,
1942         .id   = &geneve_net_id,
1943         .size = sizeof(struct geneve_net),
1944 };
1945
1946 static int __init geneve_init_module(void)
1947 {
1948         int rc;
1949
1950         rc = register_pernet_subsys(&geneve_net_ops);
1951         if (rc)
1952                 goto out1;
1953
1954         rc = register_netdevice_notifier(&geneve_notifier_block);
1955         if (rc)
1956                 goto out2;
1957
1958         rc = rtnl_link_register(&geneve_link_ops);
1959         if (rc)
1960                 goto out3;
1961
1962         return 0;
1963 out3:
1964         unregister_netdevice_notifier(&geneve_notifier_block);
1965 out2:
1966         unregister_pernet_subsys(&geneve_net_ops);
1967 out1:
1968         return rc;
1969 }
1970 late_initcall(geneve_init_module);
1971
1972 static void __exit geneve_cleanup_module(void)
1973 {
1974         rtnl_link_unregister(&geneve_link_ops);
1975         unregister_netdevice_notifier(&geneve_notifier_block);
1976         unregister_pernet_subsys(&geneve_net_ops);
1977 }
1978 module_exit(geneve_cleanup_module);
1979
1980 MODULE_LICENSE("GPL");
1981 MODULE_VERSION(GENEVE_NETDEV_VER);
1982 MODULE_AUTHOR("John W. Linville <[email protected]>");
1983 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1984 MODULE_ALIAS_RTNL_LINK("geneve");