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 err = 0;
 225         void *oiph;
 226
 227         if (ip_tunnel_collect_metadata() || gs->collect_md) {
 228                 __be16 flags;
 229
 230                 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) |
 231                         (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
 232
 233                 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
 234                                          vni_to_tunnel_id(gnvh->vni),
 235                                          gnvh->opt_len * 4);
 236                 if (!tun_dst) {
 237                         DEV_STATS_INC(geneve->dev, rx_dropped);
 238                         goto drop;
 239                 }
 240                 /* Update tunnel dst according to Geneve options. */
 241                 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 242                                         gnvh->options, gnvh->opt_len * 4,
 243                                         TUNNEL_GENEVE_OPT);
 244         } else {
 245                 /* Drop packets w/ critical options,
 246                  * since we don't support any...
 247                  */
 248                 if (gnvh->critical) {
 249                         DEV_STATS_INC(geneve->dev, rx_frame_errors);
 250                         DEV_STATS_INC(geneve->dev, rx_errors);
 251                         goto drop;
 252                 }
 253         }
 254
 255         if (tun_dst)
 256                 skb_dst_set(skb, &tun_dst->dst);
 257
 258         if (gnvh->proto_type == htons(ETH_P_TEB)) {
 259                 skb_reset_mac_header(skb);
 260                 skb->protocol = eth_type_trans(skb, geneve->dev);
 261                 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 262
 263                 /* Ignore packet loops (and multicast echo) */
 264                 if (ether_addr_equal(eth_hdr(skb)->h_source,
 265                                      geneve->dev->dev_addr)) {
 266                         DEV_STATS_INC(geneve->dev, rx_errors);
 267                         goto drop;
 268                 }
 269         } else {
 270                 skb_reset_mac_header(skb);
 271                 skb->dev = geneve->dev;
 272                 skb->pkt_type = PACKET_HOST;
 273         }
 274
 275         oiph = skb_network_header(skb);
 276         skb_reset_network_header(skb);
 277
 278         if (geneve_get_sk_family(gs) == AF_INET)
 279                 err = IP_ECN_decapsulate(oiph, skb);
 280 #if IS_ENABLED(CONFIG_IPV6)
 281         else
 282                 err = IP6_ECN_decapsulate(oiph, skb);
 283 #endif
 284
 285         if (unlikely(err)) {
 286                 if (log_ecn_error) {
 287                         if (geneve_get_sk_family(gs) == AF_INET)
 288                                 net_info_ratelimited("non-ECT from %pI4 "
 289                                                      "with TOS=%#x\n",
 290                                                      &((struct iphdr *)oiph)->saddr,
 291                                                      ((struct iphdr *)oiph)->tos);
 292 #if IS_ENABLED(CONFIG_IPV6)
 293                         else
 294                                 net_info_ratelimited("non-ECT from %pI6\n",
 295                                                      &((struct ipv6hdr *)oiph)->saddr);
 296 #endif
 297                 }
 298                 if (err > 1) {
 299                         DEV_STATS_INC(geneve->dev, rx_frame_errors);
 300                         DEV_STATS_INC(geneve->dev, rx_errors);
 301                         goto drop;
 302                 }
 303         }
 304
 305         len = skb->len;
 306         err = gro_cells_receive(&geneve->gro_cells, skb);
 307         if (likely(err == NET_RX_SUCCESS))
 308                 dev_sw_netstats_rx_add(geneve->dev, len);
 309
 310         return;
 311 drop:
 312         /* Consume bad packet */
 313         kfree_skb(skb);
 314 }
 315
 316 /* Setup stats when device is created */
 317 static int geneve_init(struct net_device *dev)
 318 {
 319         struct geneve_dev *geneve = netdev_priv(dev);
 320         int err;
 321
 322         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 323         if (!dev->tstats)
 324                 return -ENOMEM;
 325
 326         err = gro_cells_init(&geneve->gro_cells, dev);
 327         if (err) {
 328                 free_percpu(dev->tstats);
 329                 return err;
 330         }
 331
 332         err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
 333         if (err) {
 334                 free_percpu(dev->tstats);
 335                 gro_cells_destroy(&geneve->gro_cells);
 336                 return err;
 337         }
 338         return 0;
 339 }
 340
 341 static void geneve_uninit(struct net_device *dev)
 342 {
 343         struct geneve_dev *geneve = netdev_priv(dev);
 344
 345         dst_cache_destroy(&geneve->cfg.info.dst_cache);
 346         gro_cells_destroy(&geneve->gro_cells);
 347         free_percpu(dev->tstats);
 348 }
 349
 350 /* Callback from net/ipv4/udp.c to receive packets */
 351 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 352 {
 353         struct genevehdr *geneveh;
 354         struct geneve_dev *geneve;
 355         struct geneve_sock *gs;
 356         __be16 inner_proto;
 357         int opts_len;
 358
 359         /* Need UDP and Geneve header to be present */
 360         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 361                 goto drop;
 362
 363         /* Return packets with reserved bits set */
 364         geneveh = geneve_hdr(skb);
 365         if (unlikely(geneveh->ver != GENEVE_VER))
 366                 goto drop;
 367
 368         gs = rcu_dereference_sk_user_data(sk);
 369         if (!gs)
 370                 goto drop;
 371
 372         geneve = geneve_lookup_skb(gs, skb);
 373         if (!geneve)
 374                 goto drop;
 375
 376         inner_proto = geneveh->proto_type;
 377
 378         if (unlikely((!geneve->cfg.inner_proto_inherit &&
 379                       inner_proto != htons(ETH_P_TEB)))) {
 380                 DEV_STATS_INC(geneve->dev, rx_dropped);
 381                 goto drop;
 382         }
 383
 384         opts_len = geneveh->opt_len * 4;
 385         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto,
 386                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 387                 DEV_STATS_INC(geneve->dev, rx_dropped);
 388                 goto drop;
 389         }
 390
 391         geneve_rx(geneve, gs, skb);
 392         return 0;
 393
 394 drop:
 395         /* Consume bad packet */
 396         kfree_skb(skb);
 397         return 0;
 398 }
 399
 400 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
 401 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
 402 {
 403         struct genevehdr *geneveh;
 404         struct geneve_sock *gs;
 405         u8 zero_vni[3] = { 0 };
 406         u8 *vni = zero_vni;
 407
 408         if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
 409                 return -EINVAL;
 410
 411         geneveh = geneve_hdr(skb);
 412         if (geneveh->ver != GENEVE_VER)
 413                 return -EINVAL;
 414
 415         if (geneveh->proto_type != htons(ETH_P_TEB))
 416                 return -EINVAL;
 417
 418         gs = rcu_dereference_sk_user_data(sk);
 419         if (!gs)
 420                 return -ENOENT;
 421
 422         if (geneve_get_sk_family(gs) == AF_INET) {
 423                 struct iphdr *iph = ip_hdr(skb);
 424                 __be32 addr4 = 0;
 425
 426                 if (!gs->collect_md) {
 427                         vni = geneve_hdr(skb)->vni;
 428                         addr4 = iph->daddr;
 429                 }
 430
 431                 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
 432         }
 433
 434 #if IS_ENABLED(CONFIG_IPV6)
 435         if (geneve_get_sk_family(gs) == AF_INET6) {
 436                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
 437                 struct in6_addr addr6;
 438
 439                 memset(&addr6, 0, sizeof(struct in6_addr));
 440
 441                 if (!gs->collect_md) {
 442                         vni = geneve_hdr(skb)->vni;
 443                         addr6 = ip6h->daddr;
 444                 }
 445
 446                 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
 447         }
 448 #endif
 449
 450         return -EPFNOSUPPORT;
 451 }
 452
 453 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 454                                          __be16 port, bool ipv6_rx_csum)
 455 {
 456         struct socket *sock;
 457         struct udp_port_cfg udp_conf;
 458         int err;
 459
 460         memset(&udp_conf, 0, sizeof(udp_conf));
 461
 462         if (ipv6) {
 463                 udp_conf.family = AF_INET6;
 464                 udp_conf.ipv6_v6only = 1;
 465                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 466         } else {
 467                 udp_conf.family = AF_INET;
 468                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 469         }
 470
 471         udp_conf.local_udp_port = port;
 472
 473         /* Open UDP socket */
 474         err = udp_sock_create(net, &udp_conf, &sock);
 475         if (err < 0)
 476                 return ERR_PTR(err);
 477
 478         udp_allow_gso(sock->sk);
 479         return sock;
 480 }
 481
 482 static int geneve_hlen(struct genevehdr *gh)
 483 {
 484         return sizeof(*gh) + gh->opt_len * 4;
 485 }
 486
 487 static struct sk_buff *geneve_gro_receive(struct sock *sk,
 488                                           struct list_head *head,
 489                                           struct sk_buff *skb)
 490 {
 491         struct sk_buff *pp = NULL;
 492         struct sk_buff *p;
 493         struct genevehdr *gh, *gh2;
 494         unsigned int hlen, gh_len, off_gnv;
 495         const struct packet_offload *ptype;
 496         __be16 type;
 497         int flush = 1;
 498
 499         off_gnv = skb_gro_offset(skb);
 500         hlen = off_gnv + sizeof(*gh);
 501         gh = skb_gro_header(skb, hlen, off_gnv);
 502         if (unlikely(!gh))
 503                 goto out;
 504
 505         if (gh->ver != GENEVE_VER || gh->oam)
 506                 goto out;
 507         gh_len = geneve_hlen(gh);
 508
 509         hlen = off_gnv + gh_len;
 510         if (skb_gro_header_hard(skb, hlen)) {
 511                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 512                 if (unlikely(!gh))
 513                         goto out;
 514         }
 515
 516         list_for_each_entry(p, head, list) {
 517                 if (!NAPI_GRO_CB(p)->same_flow)
 518                         continue;
 519
 520                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 521                 if (gh->opt_len != gh2->opt_len ||
 522                     memcmp(gh, gh2, gh_len)) {
 523                         NAPI_GRO_CB(p)->same_flow = 0;
 524                         continue;
 525                 }
 526         }
 527
 528         skb_gro_pull(skb, gh_len);
 529         skb_gro_postpull_rcsum(skb, gh, gh_len);
 530         type = gh->proto_type;
 531         if (likely(type == htons(ETH_P_TEB)))
 532                 return call_gro_receive(eth_gro_receive, head, skb);
 533
 534         ptype = gro_find_receive_by_type(type);
 535         if (!ptype)
 536                 goto out;
 537
 538         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 539         flush = 0;
 540
 541 out:
 542         skb_gro_flush_final(skb, pp, flush);
 543
 544         return pp;
 545 }
 546
 547 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 548                                int nhoff)
 549 {
 550         struct genevehdr *gh;
 551         struct packet_offload *ptype;
 552         __be16 type;
 553         int gh_len;
 554         int err = -ENOSYS;
 555
 556         gh = (struct genevehdr *)(skb->data + nhoff);
 557         gh_len = geneve_hlen(gh);
 558         type = gh->proto_type;
 559
 560         /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */
 561         if (likely(type == htons(ETH_P_TEB)))
 562                 return eth_gro_complete(skb, nhoff + gh_len);
 563
 564         ptype = gro_find_complete_by_type(type);
 565         if (ptype)
 566                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 567
 568         skb_set_inner_mac_header(skb, nhoff + gh_len);
 569
 570         return err;
 571 }
 572
 573 /* Create new listen socket if needed */
 574 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 575                                                 bool ipv6, bool ipv6_rx_csum)
 576 {
 577         struct geneve_net *gn = net_generic(net, geneve_net_id);
 578         struct geneve_sock *gs;
 579         struct socket *sock;
 580         struct udp_tunnel_sock_cfg tunnel_cfg;
 581         int h;
 582
 583         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 584         if (!gs)
 585                 return ERR_PTR(-ENOMEM);
 586
 587         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 588         if (IS_ERR(sock)) {
 589                 kfree(gs);
 590                 return ERR_CAST(sock);
 591         }
 592
 593         gs->sock = sock;
 594         gs->refcnt = 1;
 595         for (h = 0; h < VNI_HASH_SIZE; ++h)
 596                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 597
 598         /* Initialize the geneve udp offloads structure */
 599         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 600
 601         /* Mark socket as an encapsulation socket */
 602         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 603         tunnel_cfg.sk_user_data = gs;
 604         tunnel_cfg.encap_type = 1;
 605         tunnel_cfg.gro_receive = geneve_gro_receive;
 606         tunnel_cfg.gro_complete = geneve_gro_complete;
 607         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 608         tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
 609         tunnel_cfg.encap_destroy = NULL;
 610         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 611         list_add(&gs->list, &gn->sock_list);
 612         return gs;
 613 }
 614
 615 static void __geneve_sock_release(struct geneve_sock *gs)
 616 {
 617         if (!gs || --gs->refcnt)
 618                 return;
 619
 620         list_del(&gs->list);
 621         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 622         udp_tunnel_sock_release(gs->sock);
 623         kfree_rcu(gs, rcu);
 624 }
 625
 626 static void geneve_sock_release(struct geneve_dev *geneve)
 627 {
 628         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 629 #if IS_ENABLED(CONFIG_IPV6)
 630         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 631
 632         rcu_assign_pointer(geneve->sock6, NULL);
 633 #endif
 634
 635         rcu_assign_pointer(geneve->sock4, NULL);
 636         synchronize_net();
 637
 638         __geneve_sock_release(gs4);
 639 #if IS_ENABLED(CONFIG_IPV6)
 640         __geneve_sock_release(gs6);
 641 #endif
 642 }
 643
 644 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 645                                             sa_family_t family,
 646                                             __be16 dst_port)
 647 {
 648         struct geneve_sock *gs;
 649
 650         list_for_each_entry(gs, &gn->sock_list, list) {
 651                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 652                     geneve_get_sk_family(gs) == family) {
 653                         return gs;
 654                 }
 655         }
 656         return NULL;
 657 }
 658
 659 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 660 {
 661         struct net *net = geneve->net;
 662         struct geneve_net *gn = net_generic(net, geneve_net_id);
 663         struct geneve_dev_node *node;
 664         struct geneve_sock *gs;
 665         __u8 vni[3];
 666         __u32 hash;
 667
 668         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
 669         if (gs) {
 670                 gs->refcnt++;
 671                 goto out;
 672         }
 673
 674         gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
 675                                   geneve->cfg.use_udp6_rx_checksums);
 676         if (IS_ERR(gs))
 677                 return PTR_ERR(gs);
 678
 679 out:
 680         gs->collect_md = geneve->cfg.collect_md;
 681 #if IS_ENABLED(CONFIG_IPV6)
 682         if (ipv6) {
 683                 rcu_assign_pointer(geneve->sock6, gs);
 684                 node = &geneve->hlist6;
 685         } else
 686 #endif
 687         {
 688                 rcu_assign_pointer(geneve->sock4, gs);
 689                 node = &geneve->hlist4;
 690         }
 691         node->geneve = geneve;
 692
 693         tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
 694         hash = geneve_net_vni_hash(vni);
 695         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 696         return 0;
 697 }
 698
 699 static int geneve_open(struct net_device *dev)
 700 {
 701         struct geneve_dev *geneve = netdev_priv(dev);
 702         bool metadata = geneve->cfg.collect_md;
 703         bool ipv4, ipv6;
 704         int ret = 0;
 705
 706         ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
 707         ipv4 = !ipv6 || metadata;
 708 #if IS_ENABLED(CONFIG_IPV6)
 709         if (ipv6) {
 710                 ret = geneve_sock_add(geneve, true);
 711                 if (ret < 0 && ret != -EAFNOSUPPORT)
 712                         ipv4 = false;
 713         }
 714 #endif
 715         if (ipv4)
 716                 ret = geneve_sock_add(geneve, false);
 717         if (ret < 0)
 718                 geneve_sock_release(geneve);
 719
 720         return ret;
 721 }
 722
 723 static int geneve_stop(struct net_device *dev)
 724 {
 725         struct geneve_dev *geneve = netdev_priv(dev);
 726
 727         hlist_del_init_rcu(&geneve->hlist4.hlist);
 728 #if IS_ENABLED(CONFIG_IPV6)
 729         hlist_del_init_rcu(&geneve->hlist6.hlist);
 730 #endif
 731         geneve_sock_release(geneve);
 732         return 0;
 733 }
 734
 735 static void geneve_build_header(struct genevehdr *geneveh,
 736                                 const struct ip_tunnel_info *info,
 737                                 __be16 inner_proto)
 738 {
 739         geneveh->ver = GENEVE_VER;
 740         geneveh->opt_len = info->options_len / 4;
 741         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 742         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 743         geneveh->rsvd1 = 0;
 744         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 745         geneveh->proto_type = inner_proto;
 746         geneveh->rsvd2 = 0;
 747
 748         if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
 749                 ip_tunnel_info_opts_get(geneveh->options, info);
 750 }
 751
 752 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 753                             const struct ip_tunnel_info *info,
 754                             bool xnet, int ip_hdr_len,
 755                             bool inner_proto_inherit)
 756 {
 757         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 758         struct genevehdr *gnvh;
 759         __be16 inner_proto;
 760         int min_headroom;
 761         int err;
 762
 763         skb_reset_mac_header(skb);
 764         skb_scrub_packet(skb, xnet);
 765
 766         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 767                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 768         err = skb_cow_head(skb, min_headroom);
 769         if (unlikely(err))
 770                 goto free_dst;
 771
 772         err = udp_tunnel_handle_offloads(skb, udp_sum);
 773         if (err)
 774                 goto free_dst;
 775
 776         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 777         inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB);
 778         geneve_build_header(gnvh, info, inner_proto);
 779         skb_set_inner_protocol(skb, inner_proto);
 780         return 0;
 781
 782 free_dst:
 783         dst_release(dst);
 784         return err;
 785 }
 786
 787 static u8 geneve_get_dsfield(struct sk_buff *skb, struct net_device *dev,
 788                              const struct ip_tunnel_info *info,
 789                              bool *use_cache)
 790 {
 791         struct geneve_dev *geneve = netdev_priv(dev);
 792         u8 dsfield;
 793
 794         dsfield = info->key.tos;
 795         if (dsfield == 1 && !geneve->cfg.collect_md) {
 796                 dsfield = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 797                 *use_cache = false;
 798         }
 799
 800         return dsfield;
 801 }
 802
 803 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 804                            struct geneve_dev *geneve,
 805                            const struct ip_tunnel_info *info)
 806 {
 807         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 808         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 809         const struct ip_tunnel_key *key = &info->key;
 810         struct rtable *rt;
 811         bool use_cache;
 812         __u8 tos, ttl;
 813         __be16 df = 0;
 814         __be32 saddr;
 815         __be16 sport;
 816         int err;
 817
 818         if (!pskb_inet_may_pull(skb))
 819                 return -EINVAL;
 820
 821         if (!gs4)
 822                 return -EIO;
 823
 824         use_cache = ip_tunnel_dst_cache_usable(skb, info);
 825         tos = geneve_get_dsfield(skb, dev, info, &use_cache);
 826         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 827
 828         rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr,
 829                                    &info->key,
 830                                    sport, geneve->cfg.info.key.tp_dst, tos,
 831                                    use_cache ?
 832                                    (struct dst_cache *)&info->dst_cache : NULL);
 833         if (IS_ERR(rt))
 834                 return PTR_ERR(rt);
 835
 836         err = skb_tunnel_check_pmtu(skb, &rt->dst,
 837                                     GENEVE_IPV4_HLEN + info->options_len,
 838                                     netif_is_any_bridge_port(dev));
 839         if (err < 0) {
 840                 dst_release(&rt->dst);
 841                 return err;
 842         } else if (err) {
 843                 struct ip_tunnel_info *info;
 844
 845                 info = skb_tunnel_info(skb);
 846                 if (info) {
 847                         struct ip_tunnel_info *unclone;
 848
 849                         unclone = skb_tunnel_info_unclone(skb);
 850                         if (unlikely(!unclone)) {
 851                                 dst_release(&rt->dst);
 852                                 return -ENOMEM;
 853                         }
 854
 855                         unclone->key.u.ipv4.dst = saddr;
 856                         unclone->key.u.ipv4.src = info->key.u.ipv4.dst;
 857                 }
 858
 859                 if (!pskb_may_pull(skb, ETH_HLEN)) {
 860                         dst_release(&rt->dst);
 861                         return -EINVAL;
 862                 }
 863
 864                 skb->protocol = eth_type_trans(skb, geneve->dev);
 865                 __netif_rx(skb);
 866                 dst_release(&rt->dst);
 867                 return -EMSGSIZE;
 868         }
 869
 870         tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb);
 871         if (geneve->cfg.collect_md) {
 872                 ttl = key->ttl;
 873
 874                 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 875         } else {
 876                 if (geneve->cfg.ttl_inherit)
 877                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 878                 else
 879                         ttl = key->ttl;
 880                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 881
 882                 if (geneve->cfg.df == GENEVE_DF_SET) {
 883                         df = htons(IP_DF);
 884                 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
 885                         struct ethhdr *eth = eth_hdr(skb);
 886
 887                         if (ntohs(eth->h_proto) == ETH_P_IPV6) {
 888                                 df = htons(IP_DF);
 889                         } else if (ntohs(eth->h_proto) == ETH_P_IP) {
 890                                 struct iphdr *iph = ip_hdr(skb);
 891
 892                                 if (iph->frag_off & htons(IP_DF))
 893                                         df = htons(IP_DF);
 894                         }
 895                 }
 896         }
 897
 898         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr),
 899                                geneve->cfg.inner_proto_inherit);
 900         if (unlikely(err))
 901                 return err;
 902
 903         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, saddr, info->key.u.ipv4.dst,
 904                             tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
 905                             !net_eq(geneve->net, dev_net(geneve->dev)),
 906                             !(info->key.tun_flags & TUNNEL_CSUM));
 907         return 0;
 908 }
 909
 910 #if IS_ENABLED(CONFIG_IPV6)
 911 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 912                             struct geneve_dev *geneve,
 913                             const struct ip_tunnel_info *info)
 914 {
 915         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 916         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 917         const struct ip_tunnel_key *key = &info->key;
 918         struct dst_entry *dst = NULL;
 919         struct in6_addr saddr;
 920         bool use_cache;
 921         __u8 prio, ttl;
 922         __be16 sport;
 923         int err;
 924
 925         if (!pskb_inet_may_pull(skb))
 926                 return -EINVAL;
 927
 928         if (!gs6)
 929                 return -EIO;
 930
 931         use_cache = ip_tunnel_dst_cache_usable(skb, info);
 932         prio = geneve_get_dsfield(skb, dev, info, &use_cache);
 933         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 934
 935         dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0,
 936                                      &saddr, key, sport,
 937                                      geneve->cfg.info.key.tp_dst, prio,
 938                                      use_cache ?
 939                                      (struct dst_cache *)&info->dst_cache : NULL);
 940         if (IS_ERR(dst))
 941                 return PTR_ERR(dst);
 942
 943         err = skb_tunnel_check_pmtu(skb, dst,
 944                                     GENEVE_IPV6_HLEN + info->options_len,
 945                                     netif_is_any_bridge_port(dev));
 946         if (err < 0) {
 947                 dst_release(dst);
 948                 return err;
 949         } else if (err) {
 950                 struct ip_tunnel_info *info = skb_tunnel_info(skb);
 951
 952                 if (info) {
 953                         struct ip_tunnel_info *unclone;
 954
 955                         unclone = skb_tunnel_info_unclone(skb);
 956                         if (unlikely(!unclone)) {
 957                                 dst_release(dst);
 958                                 return -ENOMEM;
 959                         }
 960
 961                         unclone->key.u.ipv6.dst = saddr;
 962                         unclone->key.u.ipv6.src = info->key.u.ipv6.dst;
 963                 }
 964
 965                 if (!pskb_may_pull(skb, ETH_HLEN)) {
 966                         dst_release(dst);
 967                         return -EINVAL;
 968                 }
 969
 970                 skb->protocol = eth_type_trans(skb, geneve->dev);
 971                 __netif_rx(skb);
 972                 dst_release(dst);
 973                 return -EMSGSIZE;
 974         }
 975
 976         prio = ip_tunnel_ecn_encap(prio, ip_hdr(skb), skb);
 977         if (geneve->cfg.collect_md) {
 978                 ttl = key->ttl;
 979         } else {
 980                 if (geneve->cfg.ttl_inherit)
 981                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 982                 else
 983                         ttl = key->ttl;
 984                 ttl = ttl ? : ip6_dst_hoplimit(dst);
 985         }
 986         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr),
 987                                geneve->cfg.inner_proto_inherit);
 988         if (unlikely(err))
 989                 return err;
 990
 991         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
 992                              &saddr, &key->u.ipv6.dst, prio, ttl,
 993                              info->key.label, sport, geneve->cfg.info.key.tp_dst,
 994                              !(info->key.tun_flags & TUNNEL_CSUM));
 995         return 0;
 996 }
 997 #endif
 998
 999 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1000 {
1001         struct geneve_dev *geneve = netdev_priv(dev);
1002         struct ip_tunnel_info *info = NULL;
1003         int err;
1004
1005         if (geneve->cfg.collect_md) {
1006                 info = skb_tunnel_info(skb);
1007                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1008                         netdev_dbg(dev, "no tunnel metadata\n");
1009                         dev_kfree_skb(skb);
1010                         DEV_STATS_INC(dev, tx_dropped);
1011                         return NETDEV_TX_OK;
1012                 }
1013         } else {
1014                 info = &geneve->cfg.info;
1015         }
1016
1017         rcu_read_lock();
1018 #if IS_ENABLED(CONFIG_IPV6)
1019         if (info->mode & IP_TUNNEL_INFO_IPV6)
1020                 err = geneve6_xmit_skb(skb, dev, geneve, info);
1021         else
1022 #endif
1023                 err = geneve_xmit_skb(skb, dev, geneve, info);
1024         rcu_read_unlock();
1025
1026         if (likely(!err))
1027                 return NETDEV_TX_OK;
1028
1029         if (err != -EMSGSIZE)
1030                 dev_kfree_skb(skb);
1031
1032         if (err == -ELOOP)
1033                 DEV_STATS_INC(dev, collisions);
1034         else if (err == -ENETUNREACH)
1035                 DEV_STATS_INC(dev, tx_carrier_errors);
1036
1037         DEV_STATS_INC(dev, tx_errors);
1038         return NETDEV_TX_OK;
1039 }
1040
1041 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1042 {
1043         if (new_mtu > dev->max_mtu)
1044                 new_mtu = dev->max_mtu;
1045         else if (new_mtu < dev->min_mtu)
1046                 new_mtu = dev->min_mtu;
1047
1048         dev->mtu = new_mtu;
1049         return 0;
1050 }
1051
1052 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1053 {
1054         struct ip_tunnel_info *info = skb_tunnel_info(skb);
1055         struct geneve_dev *geneve = netdev_priv(dev);
1056         __be16 sport;
1057
1058         if (ip_tunnel_info_af(info) == AF_INET) {
1059                 struct rtable *rt;
1060                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1061                 bool use_cache;
1062                 __be32 saddr;
1063                 u8 tos;
1064
1065                 if (!gs4)
1066                         return -EIO;
1067
1068                 use_cache = ip_tunnel_dst_cache_usable(skb, info);
1069                 tos = geneve_get_dsfield(skb, dev, info, &use_cache);
1070                 sport = udp_flow_src_port(geneve->net, skb,
1071                                           1, USHRT_MAX, true);
1072
1073                 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr,
1074                                            &info->key,
1075                                            sport, geneve->cfg.info.key.tp_dst,
1076                                            tos,
1077                                            use_cache ? &info->dst_cache : NULL);
1078                 if (IS_ERR(rt))
1079                         return PTR_ERR(rt);
1080
1081                 ip_rt_put(rt);
1082                 info->key.u.ipv4.src = saddr;
1083 #if IS_ENABLED(CONFIG_IPV6)
1084         } else if (ip_tunnel_info_af(info) == AF_INET6) {
1085                 struct dst_entry *dst;
1086                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1087                 struct in6_addr saddr;
1088                 bool use_cache;
1089                 u8 prio;
1090
1091                 if (!gs6)
1092                         return -EIO;
1093
1094                 use_cache = ip_tunnel_dst_cache_usable(skb, info);
1095                 prio = geneve_get_dsfield(skb, dev, info, &use_cache);
1096                 sport = udp_flow_src_port(geneve->net, skb,
1097                                           1, USHRT_MAX, true);
1098
1099                 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0,
1100                                              &saddr, &info->key, sport,
1101                                              geneve->cfg.info.key.tp_dst, prio,
1102                                              use_cache ? &info->dst_cache : NULL);
1103                 if (IS_ERR(dst))
1104                         return PTR_ERR(dst);
1105
1106                 dst_release(dst);
1107                 info->key.u.ipv6.src = saddr;
1108 #endif
1109         } else {
1110                 return -EINVAL;
1111         }
1112
1113         info->key.tp_src = sport;
1114         info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1115         return 0;
1116 }
1117
1118 static const struct net_device_ops geneve_netdev_ops = {
1119         .ndo_init               = geneve_init,
1120         .ndo_uninit             = geneve_uninit,
1121         .ndo_open               = geneve_open,
1122         .ndo_stop               = geneve_stop,
1123         .ndo_start_xmit         = geneve_xmit,
1124         .ndo_get_stats64        = dev_get_tstats64,
1125         .ndo_change_mtu         = geneve_change_mtu,
1126         .ndo_validate_addr      = eth_validate_addr,
1127         .ndo_set_mac_address    = eth_mac_addr,
1128         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1129 };
1130
1131 static void geneve_get_drvinfo(struct net_device *dev,
1132                                struct ethtool_drvinfo *drvinfo)
1133 {
1134         strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1135         strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1136 }
1137
1138 static const struct ethtool_ops geneve_ethtool_ops = {
1139         .get_drvinfo    = geneve_get_drvinfo,
1140         .get_link       = ethtool_op_get_link,
1141 };
1142
1143 /* Info for udev, that this is a virtual tunnel endpoint */
1144 static struct device_type geneve_type = {
1145         .name = "geneve",
1146 };
1147
1148 /* Calls the ndo_udp_tunnel_add of the caller in order to
1149  * supply the listening GENEVE udp ports. Callers are expected
1150  * to implement the ndo_udp_tunnel_add.
1151  */
1152 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1153 {
1154         struct net *net = dev_net(dev);
1155         struct geneve_net *gn = net_generic(net, geneve_net_id);
1156         struct geneve_sock *gs;
1157
1158         rcu_read_lock();
1159         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1160                 if (push) {
1161                         udp_tunnel_push_rx_port(dev, gs->sock,
1162                                                 UDP_TUNNEL_TYPE_GENEVE);
1163                 } else {
1164                         udp_tunnel_drop_rx_port(dev, gs->sock,
1165                                                 UDP_TUNNEL_TYPE_GENEVE);
1166                 }
1167         }
1168         rcu_read_unlock();
1169 }
1170
1171 /* Initialize the device structure. */
1172 static void geneve_setup(struct net_device *dev)
1173 {
1174         ether_setup(dev);
1175
1176         dev->netdev_ops = &geneve_netdev_ops;
1177         dev->ethtool_ops = &geneve_ethtool_ops;
1178         dev->needs_free_netdev = true;
1179
1180         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1181
1182         dev->features    |= NETIF_F_LLTX;
1183         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1184         dev->features    |= NETIF_F_RXCSUM;
1185         dev->features    |= NETIF_F_GSO_SOFTWARE;
1186
1187         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1188         dev->hw_features |= NETIF_F_RXCSUM;
1189         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1190
1191         /* MTU range: 68 - (something less than 65535) */
1192         dev->min_mtu = ETH_MIN_MTU;
1193         /* The max_mtu calculation does not take account of GENEVE
1194          * options, to avoid excluding potentially valid
1195          * configurations. This will be further reduced by IPvX hdr size.
1196          */
1197         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1198
1199         netif_keep_dst(dev);
1200         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1201         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1202         eth_hw_addr_random(dev);
1203 }
1204
1205 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1206         [IFLA_GENEVE_UNSPEC]            = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT },
1207         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1208         [IFLA_GENEVE_REMOTE]            = { .len = sizeof_field(struct iphdr, daddr) },
1209         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1210         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1211         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1212         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1213         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1214         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1215         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1216         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1217         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1218         [IFLA_GENEVE_TTL_INHERIT]       = { .type = NLA_U8 },
1219         [IFLA_GENEVE_DF]                = { .type = NLA_U8 },
1220         [IFLA_GENEVE_INNER_PROTO_INHERIT]       = { .type = NLA_FLAG },
1221 };
1222
1223 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1224                            struct netlink_ext_ack *extack)
1225 {
1226         if (tb[IFLA_ADDRESS]) {
1227                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1228                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1229                                             "Provided link layer address is not Ethernet");
1230                         return -EINVAL;
1231                 }
1232
1233                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1234                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1235                                             "Provided Ethernet address is not unicast");
1236                         return -EADDRNOTAVAIL;
1237                 }
1238         }
1239
1240         if (!data) {
1241                 NL_SET_ERR_MSG(extack,
1242                                "Not enough attributes provided to perform the operation");
1243                 return -EINVAL;
1244         }
1245
1246         if (data[IFLA_GENEVE_ID]) {
1247                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1248
1249                 if (vni >= GENEVE_N_VID) {
1250                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1251                                             "Geneve ID must be lower than 16777216");
1252                         return -ERANGE;
1253                 }
1254         }
1255
1256         if (data[IFLA_GENEVE_DF]) {
1257                 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1258
1259                 if (df < 0 || df > GENEVE_DF_MAX) {
1260                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1261                                             "Invalid DF attribute");
1262                         return -EINVAL;
1263                 }
1264         }
1265
1266         return 0;
1267 }
1268
1269 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1270                                           const struct ip_tunnel_info *info,
1271                                           bool *tun_on_same_port,
1272                                           bool *tun_collect_md)
1273 {
1274         struct geneve_dev *geneve, *t = NULL;
1275
1276         *tun_on_same_port = false;
1277         *tun_collect_md = false;
1278         list_for_each_entry(geneve, &gn->geneve_list, next) {
1279                 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1280                         *tun_collect_md = geneve->cfg.collect_md;
1281                         *tun_on_same_port = true;
1282                 }
1283                 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1284                     info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1285                     !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1286                         t = geneve;
1287         }
1288         return t;
1289 }
1290
1291 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1292 {
1293         return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1294                  info->key.ttl || info->key.label || info->key.tp_src ||
1295                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1296 }
1297
1298 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1299                                   struct ip_tunnel_info *b)
1300 {
1301         if (ip_tunnel_info_af(a) == AF_INET)
1302                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1303         else
1304                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1305 }
1306
1307 static int geneve_configure(struct net *net, struct net_device *dev,
1308                             struct netlink_ext_ack *extack,
1309                             const struct geneve_config *cfg)
1310 {
1311         struct geneve_net *gn = net_generic(net, geneve_net_id);
1312         struct geneve_dev *t, *geneve = netdev_priv(dev);
1313         const struct ip_tunnel_info *info = &cfg->info;
1314         bool tun_collect_md, tun_on_same_port;
1315         int err, encap_len;
1316
1317         if (cfg->collect_md && !is_tnl_info_zero(info)) {
1318                 NL_SET_ERR_MSG(extack,
1319                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1320                 return -EINVAL;
1321         }
1322
1323         geneve->net = net;
1324         geneve->dev = dev;
1325
1326         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1327         if (t)
1328                 return -EBUSY;
1329
1330         /* make enough headroom for basic scenario */
1331         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1332         if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1333                 encap_len += sizeof(struct iphdr);
1334                 dev->max_mtu -= sizeof(struct iphdr);
1335         } else {
1336                 encap_len += sizeof(struct ipv6hdr);
1337                 dev->max_mtu -= sizeof(struct ipv6hdr);
1338         }
1339         dev->needed_headroom = encap_len + ETH_HLEN;
1340
1341         if (cfg->collect_md) {
1342                 if (tun_on_same_port) {
1343                         NL_SET_ERR_MSG(extack,
1344                                        "There can be only one externally controlled device on a destination port");
1345                         return -EPERM;
1346                 }
1347         } else {
1348                 if (tun_collect_md) {
1349                         NL_SET_ERR_MSG(extack,
1350                                        "There already exists an externally controlled device on this destination port");
1351                         return -EPERM;
1352                 }
1353         }
1354
1355         dst_cache_reset(&geneve->cfg.info.dst_cache);
1356         memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1357
1358         if (geneve->cfg.inner_proto_inherit) {
1359                 dev->header_ops = NULL;
1360                 dev->type = ARPHRD_NONE;
1361                 dev->hard_header_len = 0;
1362                 dev->addr_len = 0;
1363                 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1364         }
1365
1366         err = register_netdevice(dev);
1367         if (err)
1368                 return err;
1369
1370         list_add(&geneve->next, &gn->geneve_list);
1371         return 0;
1372 }
1373
1374 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1375 {
1376         memset(info, 0, sizeof(*info));
1377         info->key.tp_dst = htons(dst_port);
1378 }
1379
1380 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1381                           struct netlink_ext_ack *extack,
1382                           struct geneve_config *cfg, bool changelink)
1383 {
1384         struct ip_tunnel_info *info = &cfg->info;
1385         int attrtype;
1386
1387         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1388                 NL_SET_ERR_MSG(extack,
1389                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1390                 return -EINVAL;
1391         }
1392
1393         if (data[IFLA_GENEVE_REMOTE]) {
1394                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1395                         attrtype = IFLA_GENEVE_REMOTE;
1396                         goto change_notsup;
1397                 }
1398
1399                 info->key.u.ipv4.dst =
1400                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1401
1402                 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1403                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1404                                             "Remote IPv4 address cannot be Multicast");
1405                         return -EINVAL;
1406                 }
1407         }
1408
1409         if (data[IFLA_GENEVE_REMOTE6]) {
1410 #if IS_ENABLED(CONFIG_IPV6)
1411                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1412                         attrtype = IFLA_GENEVE_REMOTE6;
1413                         goto change_notsup;
1414                 }
1415
1416                 info->mode = IP_TUNNEL_INFO_IPV6;
1417                 info->key.u.ipv6.dst =
1418                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1419
1420                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1421                     IPV6_ADDR_LINKLOCAL) {
1422                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1423                                             "Remote IPv6 address cannot be link-local");
1424                         return -EINVAL;
1425                 }
1426                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1427                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1428                                             "Remote IPv6 address cannot be Multicast");
1429                         return -EINVAL;
1430                 }
1431                 info->key.tun_flags |= TUNNEL_CSUM;
1432                 cfg->use_udp6_rx_checksums = true;
1433 #else
1434                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1435                                     "IPv6 support not enabled in the kernel");
1436                 return -EPFNOSUPPORT;
1437 #endif
1438         }
1439
1440         if (data[IFLA_GENEVE_ID]) {
1441                 __u32 vni;
1442                 __u8 tvni[3];
1443                 __be64 tunid;
1444
1445                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1446                 tvni[0] = (vni & 0x00ff0000) >> 16;
1447                 tvni[1] = (vni & 0x0000ff00) >> 8;
1448                 tvni[2] =  vni & 0x000000ff;
1449
1450                 tunid = vni_to_tunnel_id(tvni);
1451                 if (changelink && (tunid != info->key.tun_id)) {
1452                         attrtype = IFLA_GENEVE_ID;
1453                         goto change_notsup;
1454                 }
1455                 info->key.tun_id = tunid;
1456         }
1457
1458         if (data[IFLA_GENEVE_TTL_INHERIT]) {
1459                 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1460                         cfg->ttl_inherit = true;
1461                 else
1462                         cfg->ttl_inherit = false;
1463         } else if (data[IFLA_GENEVE_TTL]) {
1464                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1465                 cfg->ttl_inherit = false;
1466         }
1467
1468         if (data[IFLA_GENEVE_TOS])
1469                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1470
1471         if (data[IFLA_GENEVE_DF])
1472                 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1473
1474         if (data[IFLA_GENEVE_LABEL]) {
1475                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1476                                   IPV6_FLOWLABEL_MASK;
1477                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1478                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1479                                             "Label attribute only applies for IPv6 Geneve devices");
1480                         return -EINVAL;
1481                 }
1482         }
1483
1484         if (data[IFLA_GENEVE_PORT]) {
1485                 if (changelink) {
1486                         attrtype = IFLA_GENEVE_PORT;
1487                         goto change_notsup;
1488                 }
1489                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1490         }
1491
1492         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1493                 if (changelink) {
1494                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1495                         goto change_notsup;
1496                 }
1497                 cfg->collect_md = true;
1498         }
1499
1500         if (data[IFLA_GENEVE_UDP_CSUM]) {
1501                 if (changelink) {
1502                         attrtype = IFLA_GENEVE_UDP_CSUM;
1503                         goto change_notsup;
1504                 }
1505                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1506                         info->key.tun_flags |= TUNNEL_CSUM;
1507         }
1508
1509         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1510 #if IS_ENABLED(CONFIG_IPV6)
1511                 if (changelink) {
1512                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1513                         goto change_notsup;
1514                 }
1515                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1516                         info->key.tun_flags &= ~TUNNEL_CSUM;
1517 #else
1518                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1519                                     "IPv6 support not enabled in the kernel");
1520                 return -EPFNOSUPPORT;
1521 #endif
1522         }
1523
1524         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1525 #if IS_ENABLED(CONFIG_IPV6)
1526                 if (changelink) {
1527                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1528                         goto change_notsup;
1529                 }
1530                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1531                         cfg->use_udp6_rx_checksums = false;
1532 #else
1533                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1534                                     "IPv6 support not enabled in the kernel");
1535                 return -EPFNOSUPPORT;
1536 #endif
1537         }
1538
1539         if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) {
1540                 if (changelink) {
1541                         attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT;
1542                         goto change_notsup;
1543                 }
1544                 cfg->inner_proto_inherit = true;
1545         }
1546
1547         return 0;
1548 change_notsup:
1549         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1550                             "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported");
1551         return -EOPNOTSUPP;
1552 }
1553
1554 static void geneve_link_config(struct net_device *dev,
1555                                struct ip_tunnel_info *info, struct nlattr *tb[])
1556 {
1557         struct geneve_dev *geneve = netdev_priv(dev);
1558         int ldev_mtu = 0;
1559
1560         if (tb[IFLA_MTU]) {
1561                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1562                 return;
1563         }
1564
1565         switch (ip_tunnel_info_af(info)) {
1566         case AF_INET: {
1567                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1568                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1569
1570                 if (!IS_ERR(rt) && rt->dst.dev) {
1571                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1572                         ip_rt_put(rt);
1573                 }
1574                 break;
1575         }
1576 #if IS_ENABLED(CONFIG_IPV6)
1577         case AF_INET6: {
1578                 struct rt6_info *rt;
1579
1580                 if (!__in6_dev_get(dev))
1581                         break;
1582
1583                 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1584                                 NULL, 0);
1585
1586                 if (rt && rt->dst.dev)
1587                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1588                 ip6_rt_put(rt);
1589                 break;
1590         }
1591 #endif
1592         }
1593
1594         if (ldev_mtu <= 0)
1595                 return;
1596
1597         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1598 }
1599
1600 static int geneve_newlink(struct net *net, struct net_device *dev,
1601                           struct nlattr *tb[], struct nlattr *data[],
1602                           struct netlink_ext_ack *extack)
1603 {
1604         struct geneve_config cfg = {
1605                 .df = GENEVE_DF_UNSET,
1606                 .use_udp6_rx_checksums = false,
1607                 .ttl_inherit = false,
1608                 .collect_md = false,
1609         };
1610         int err;
1611
1612         init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1613         err = geneve_nl2info(tb, data, extack, &cfg, false);
1614         if (err)
1615                 return err;
1616
1617         err = geneve_configure(net, dev, extack, &cfg);
1618         if (err)
1619                 return err;
1620
1621         geneve_link_config(dev, &cfg.info, tb);
1622
1623         return 0;
1624 }
1625
1626 /* Quiesces the geneve device data path for both TX and RX.
1627  *
1628  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1629  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1630  * to complete for the existing set of in-flight packets to be transmitted,
1631  * then we would have quiesced the transmit data path. All the future packets
1632  * will get dropped until we unquiesce the data path.
1633  *
1634  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1635  * if we set that to NULL under RCU and wait for synchronize_net() to
1636  * complete, then we would have quiesced the receive data path.
1637  */
1638 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1639                            struct geneve_sock **gs6)
1640 {
1641         *gs4 = rtnl_dereference(geneve->sock4);
1642         rcu_assign_pointer(geneve->sock4, NULL);
1643         if (*gs4)
1644                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1645 #if IS_ENABLED(CONFIG_IPV6)
1646         *gs6 = rtnl_dereference(geneve->sock6);
1647         rcu_assign_pointer(geneve->sock6, NULL);
1648         if (*gs6)
1649                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1650 #else
1651         *gs6 = NULL;
1652 #endif
1653         synchronize_net();
1654 }
1655
1656 /* Resumes the geneve device data path for both TX and RX. */
1657 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1658                              struct geneve_sock __maybe_unused *gs6)
1659 {
1660         rcu_assign_pointer(geneve->sock4, gs4);
1661         if (gs4)
1662                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1663 #if IS_ENABLED(CONFIG_IPV6)
1664         rcu_assign_pointer(geneve->sock6, gs6);
1665         if (gs6)
1666                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1667 #endif
1668         synchronize_net();
1669 }
1670
1671 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1672                              struct nlattr *data[],
1673                              struct netlink_ext_ack *extack)
1674 {
1675         struct geneve_dev *geneve = netdev_priv(dev);
1676         struct geneve_sock *gs4, *gs6;
1677         struct geneve_config cfg;
1678         int err;
1679
1680         /* If the geneve device is configured for metadata (or externally
1681          * controlled, for example, OVS), then nothing can be changed.
1682          */
1683         if (geneve->cfg.collect_md)
1684                 return -EOPNOTSUPP;
1685
1686         /* Start with the existing info. */
1687         memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1688         err = geneve_nl2info(tb, data, extack, &cfg, true);
1689         if (err)
1690                 return err;
1691
1692         if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1693                 dst_cache_reset(&cfg.info.dst_cache);
1694                 geneve_link_config(dev, &cfg.info, tb);
1695         }
1696
1697         geneve_quiesce(geneve, &gs4, &gs6);
1698         memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1699         geneve_unquiesce(geneve, gs4, gs6);
1700
1701         return 0;
1702 }
1703
1704 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1705 {
1706         struct geneve_dev *geneve = netdev_priv(dev);
1707
1708         list_del(&geneve->next);
1709         unregister_netdevice_queue(dev, head);
1710 }
1711
1712 static size_t geneve_get_size(const struct net_device *dev)
1713 {
1714         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1715                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1716                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1717                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1718                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_DF */
1719                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1720                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1721                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1722                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1723                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1724                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1725                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1726                 nla_total_size(0) +      /* IFLA_GENEVE_INNER_PROTO_INHERIT */
1727                 0;
1728 }
1729
1730 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1731 {
1732         struct geneve_dev *geneve = netdev_priv(dev);
1733         struct ip_tunnel_info *info = &geneve->cfg.info;
1734         bool ttl_inherit = geneve->cfg.ttl_inherit;
1735         bool metadata = geneve->cfg.collect_md;
1736         __u8 tmp_vni[3];
1737         __u32 vni;
1738
1739         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1740         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1741         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1742                 goto nla_put_failure;
1743
1744         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1745                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1746                                     info->key.u.ipv4.dst))
1747                         goto nla_put_failure;
1748                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1749                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1750                         goto nla_put_failure;
1751
1752 #if IS_ENABLED(CONFIG_IPV6)
1753         } else if (!metadata) {
1754                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1755                                      &info->key.u.ipv6.dst))
1756                         goto nla_put_failure;
1757                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1758                                !(info->key.tun_flags & TUNNEL_CSUM)))
1759                         goto nla_put_failure;
1760 #endif
1761         }
1762
1763         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1764             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1765             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1766                 goto nla_put_failure;
1767
1768         if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1769                 goto nla_put_failure;
1770
1771         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1772                 goto nla_put_failure;
1773
1774         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1775                 goto nla_put_failure;
1776
1777 #if IS_ENABLED(CONFIG_IPV6)
1778         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1779                        !geneve->cfg.use_udp6_rx_checksums))
1780                 goto nla_put_failure;
1781 #endif
1782
1783         if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1784                 goto nla_put_failure;
1785
1786         if (geneve->cfg.inner_proto_inherit &&
1787             nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT))
1788                 goto nla_put_failure;
1789
1790         return 0;
1791
1792 nla_put_failure:
1793         return -EMSGSIZE;
1794 }
1795
1796 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1797         .kind           = "geneve",
1798         .maxtype        = IFLA_GENEVE_MAX,
1799         .policy         = geneve_policy,
1800         .priv_size      = sizeof(struct geneve_dev),
1801         .setup          = geneve_setup,
1802         .validate       = geneve_validate,
1803         .newlink        = geneve_newlink,
1804         .changelink     = geneve_changelink,
1805         .dellink        = geneve_dellink,
1806         .get_size       = geneve_get_size,
1807         .fill_info      = geneve_fill_info,
1808 };
1809
1810 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1811                                         u8 name_assign_type, u16 dst_port)
1812 {
1813         struct nlattr *tb[IFLA_MAX + 1];
1814         struct net_device *dev;
1815         LIST_HEAD(list_kill);
1816         int err;
1817         struct geneve_config cfg = {
1818                 .df = GENEVE_DF_UNSET,
1819                 .use_udp6_rx_checksums = true,
1820                 .ttl_inherit = false,
1821                 .collect_md = true,
1822         };
1823
1824         memset(tb, 0, sizeof(tb));
1825         dev = rtnl_create_link(net, name, name_assign_type,
1826                                &geneve_link_ops, tb, NULL);
1827         if (IS_ERR(dev))
1828                 return dev;
1829
1830         init_tnl_info(&cfg.info, dst_port);
1831         err = geneve_configure(net, dev, NULL, &cfg);
1832         if (err) {
1833                 free_netdev(dev);
1834                 return ERR_PTR(err);
1835         }
1836
1837         /* openvswitch users expect packet sizes to be unrestricted,
1838          * so set the largest MTU we can.
1839          */
1840         err = geneve_change_mtu(dev, IP_MAX_MTU);
1841         if (err)
1842                 goto err;
1843
1844         err = rtnl_configure_link(dev, NULL, 0, NULL);
1845         if (err < 0)
1846                 goto err;
1847
1848         return dev;
1849 err:
1850         geneve_dellink(dev, &list_kill);
1851         unregister_netdevice_many(&list_kill);
1852         return ERR_PTR(err);
1853 }
1854 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1855
1856 static int geneve_netdevice_event(struct notifier_block *unused,
1857                                   unsigned long event, void *ptr)
1858 {
1859         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1860
1861         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1862                 geneve_offload_rx_ports(dev, true);
1863         else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
1864                 geneve_offload_rx_ports(dev, false);
1865
1866         return NOTIFY_DONE;
1867 }
1868
1869 static struct notifier_block geneve_notifier_block __read_mostly = {
1870         .notifier_call = geneve_netdevice_event,
1871 };
1872
1873 static __net_init int geneve_init_net(struct net *net)
1874 {
1875         struct geneve_net *gn = net_generic(net, geneve_net_id);
1876
1877         INIT_LIST_HEAD(&gn->geneve_list);
1878         INIT_LIST_HEAD(&gn->sock_list);
1879         return 0;
1880 }
1881
1882 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1883 {
1884         struct geneve_net *gn = net_generic(net, geneve_net_id);
1885         struct geneve_dev *geneve, *next;
1886         struct net_device *dev, *aux;
1887
1888         /* gather any geneve devices that were moved into this ns */
1889         for_each_netdev_safe(net, dev, aux)
1890                 if (dev->rtnl_link_ops == &geneve_link_ops)
1891                         unregister_netdevice_queue(dev, head);
1892
1893         /* now gather any other geneve devices that were created in this ns */
1894         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1895                 /* If geneve->dev is in the same netns, it was already added
1896                  * to the list by the previous loop.
1897                  */
1898                 if (!net_eq(dev_net(geneve->dev), net))
1899                         unregister_netdevice_queue(geneve->dev, head);
1900         }
1901 }
1902
1903 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1904 {
1905         struct net *net;
1906         LIST_HEAD(list);
1907
1908         rtnl_lock();
1909         list_for_each_entry(net, net_list, exit_list)
1910                 geneve_destroy_tunnels(net, &list);
1911
1912         /* unregister the devices gathered above */
1913         unregister_netdevice_many(&list);
1914         rtnl_unlock();
1915
1916         list_for_each_entry(net, net_list, exit_list) {
1917                 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1918
1919                 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1920         }
1921 }
1922
1923 static struct pernet_operations geneve_net_ops = {
1924         .init = geneve_init_net,
1925         .exit_batch = geneve_exit_batch_net,
1926         .id   = &geneve_net_id,
1927         .size = sizeof(struct geneve_net),
1928 };
1929
1930 static int __init geneve_init_module(void)
1931 {
1932         int rc;
1933
1934         rc = register_pernet_subsys(&geneve_net_ops);
1935         if (rc)
1936                 goto out1;
1937
1938         rc = register_netdevice_notifier(&geneve_notifier_block);
1939         if (rc)
1940                 goto out2;
1941
1942         rc = rtnl_link_register(&geneve_link_ops);
1943         if (rc)
1944                 goto out3;
1945
1946         return 0;
1947 out3:
1948         unregister_netdevice_notifier(&geneve_notifier_block);
1949 out2:
1950         unregister_pernet_subsys(&geneve_net_ops);
1951 out1:
1952         return rc;
1953 }
1954 late_initcall(geneve_init_module);
1955
1956 static void __exit geneve_cleanup_module(void)
1957 {
1958         rtnl_link_unregister(&geneve_link_ops);
1959         unregister_netdevice_notifier(&geneve_notifier_block);
1960         unregister_pernet_subsys(&geneve_net_ops);
1961 }
1962 module_exit(geneve_cleanup_module);
1963
1964 MODULE_LICENSE("GPL");
1965 MODULE_VERSION(GENEVE_NETDEV_VER);
1966 MODULE_AUTHOR("John W. Linville <[email protected]>");
1967 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1968 MODULE_ALIAS_RTNL_LINK("geneve");