drivers/net/vxlan.c

   1 /*
   2  * VXLAN: Virtual eXtensible Local Area Network
   3  *
   4  * Copyright (c) 2012-2013 Vyatta Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/udp.h>
  18 #include <linux/igmp.h>
  19 #include <linux/if_ether.h>
  20 #include <linux/ethtool.h>
  21 #include <net/arp.h>
  22 #include <net/ndisc.h>
  23 #include <net/ip.h>
  24 #include <net/icmp.h>
  25 #include <net/rtnetlink.h>
  26 #include <net/inet_ecn.h>
  27 #include <net/net_namespace.h>
  28 #include <net/netns/generic.h>
  29 #include <net/vxlan.h>
  30
  31 #if IS_ENABLED(CONFIG_IPV6)
  32 #include <net/ip6_tunnel.h>
  33 #include <net/ip6_checksum.h>
  34 #endif
  35
  36 #define VXLAN_VERSION   "0.1"
  37
  38 #define PORT_HASH_BITS  8
  39 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  40 #define FDB_AGE_DEFAULT 300 /* 5 min */
  41 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  42
  43 /* UDP port for VXLAN traffic.
  44  * The IANA assigned port is 4789, but the Linux default is 8472
  45  * for compatibility with early adopters.
  46  */
  47 static unsigned short vxlan_port __read_mostly = 8472;
  48 module_param_named(udp_port, vxlan_port, ushort, 0444);
  49 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  50
  51 static bool log_ecn_error = true;
  52 module_param(log_ecn_error, bool, 0644);
  53 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  54
  55 static unsigned int vxlan_net_id;
  56 static struct rtnl_link_ops vxlan_link_ops;
  57
  58 static const u8 all_zeros_mac[ETH_ALEN + 2];
  59
  60 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  61
  62 /* per-network namespace private data for this module */
  63 struct vxlan_net {
  64         struct list_head  vxlan_list;
  65         struct hlist_head sock_list[PORT_HASH_SIZE];
  66         spinlock_t        sock_lock;
  67 };
  68
  69 /* Forwarding table entry */
  70 struct vxlan_fdb {
  71         struct hlist_node hlist;        /* linked list of entries */
  72         struct rcu_head   rcu;
  73         unsigned long     updated;      /* jiffies */
  74         unsigned long     used;
  75         struct list_head  remotes;
  76         u8                eth_addr[ETH_ALEN];
  77         u16               state;        /* see ndm_state */
  78         __be32            vni;
  79         u8                flags;        /* see ndm_flags */
  80 };
  81
  82 /* salt for hash table */
  83 static u32 vxlan_salt __read_mostly;
  84
  85 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
  86 {
  87         return vs->flags & VXLAN_F_COLLECT_METADATA ||
  88                ip_tunnel_collect_metadata();
  89 }
  90
  91 #if IS_ENABLED(CONFIG_IPV6)
  92 static inline
  93 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
  94 {
  95         if (a->sa.sa_family != b->sa.sa_family)
  96                 return false;
  97         if (a->sa.sa_family == AF_INET6)
  98                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
  99         else
 100                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 101 }
 102
 103 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 104 {
 105         if (ipa->sa.sa_family == AF_INET6)
 106                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
 107         else
 108                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 109 }
 110
 111 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 112 {
 113         if (ipa->sa.sa_family == AF_INET6)
 114                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 115         else
 116                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 117 }
 118
 119 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 120 {
 121         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 122                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 123                 ip->sa.sa_family = AF_INET6;
 124                 return 0;
 125         } else if (nla_len(nla) >= sizeof(__be32)) {
 126                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 127                 ip->sa.sa_family = AF_INET;
 128                 return 0;
 129         } else {
 130                 return -EAFNOSUPPORT;
 131         }
 132 }
 133
 134 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 135                               const union vxlan_addr *ip)
 136 {
 137         if (ip->sa.sa_family == AF_INET6)
 138                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 139         else
 140                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 141 }
 142
 143 #else /* !CONFIG_IPV6 */
 144
 145 static inline
 146 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 147 {
 148         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 149 }
 150
 151 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 152 {
 153         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 154 }
 155
 156 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 157 {
 158         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 159 }
 160
 161 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 162 {
 163         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 164                 return -EAFNOSUPPORT;
 165         } else if (nla_len(nla) >= sizeof(__be32)) {
 166                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 167                 ip->sa.sa_family = AF_INET;
 168                 return 0;
 169         } else {
 170                 return -EAFNOSUPPORT;
 171         }
 172 }
 173
 174 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 175                               const union vxlan_addr *ip)
 176 {
 177         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 178 }
 179 #endif
 180
 181 /* Virtual Network hash table head */
 182 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
 183 {
 184         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
 185 }
 186
 187 /* Socket hash table head */
 188 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 189 {
 190         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 191
 192         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 193 }
 194
 195 /* First remote destination for a forwarding entry.
 196  * Guaranteed to be non-NULL because remotes are never deleted.
 197  */
 198 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 199 {
 200         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 201 }
 202
 203 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 204 {
 205         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 206 }
 207
 208 /* Find VXLAN socket based on network namespace, address family and UDP port
 209  * and enabled unshareable flags.
 210  */
 211 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 212                                           __be16 port, u32 flags)
 213 {
 214         struct vxlan_sock *vs;
 215
 216         flags &= VXLAN_F_RCV_FLAGS;
 217
 218         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 219                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 220                     vxlan_get_sk_family(vs) == family &&
 221                     vs->flags == flags)
 222                         return vs;
 223         }
 224         return NULL;
 225 }
 226
 227 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
 228 {
 229         struct vxlan_dev *vxlan;
 230
 231         /* For flow based devices, map all packets to VNI 0 */
 232         if (vs->flags & VXLAN_F_COLLECT_METADATA)
 233                 vni = 0;
 234
 235         hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
 236                 if (vxlan->default_dst.remote_vni == vni)
 237                         return vxlan;
 238         }
 239
 240         return NULL;
 241 }
 242
 243 /* Look up VNI in a per net namespace table */
 244 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
 245                                         sa_family_t family, __be16 port,
 246                                         u32 flags)
 247 {
 248         struct vxlan_sock *vs;
 249
 250         vs = vxlan_find_sock(net, family, port, flags);
 251         if (!vs)
 252                 return NULL;
 253
 254         return vxlan_vs_find_vni(vs, vni);
 255 }
 256
 257 /* Fill in neighbour message in skbuff. */
 258 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 259                           const struct vxlan_fdb *fdb,
 260                           u32 portid, u32 seq, int type, unsigned int flags,
 261                           const struct vxlan_rdst *rdst)
 262 {
 263         unsigned long now = jiffies;
 264         struct nda_cacheinfo ci;
 265         struct nlmsghdr *nlh;
 266         struct ndmsg *ndm;
 267         bool send_ip, send_eth;
 268
 269         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 270         if (nlh == NULL)
 271                 return -EMSGSIZE;
 272
 273         ndm = nlmsg_data(nlh);
 274         memset(ndm, 0, sizeof(*ndm));
 275
 276         send_eth = send_ip = true;
 277
 278         if (type == RTM_GETNEIGH) {
 279                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 280                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 281                 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
 282         } else
 283                 ndm->ndm_family = AF_BRIDGE;
 284         ndm->ndm_state = fdb->state;
 285         ndm->ndm_ifindex = vxlan->dev->ifindex;
 286         ndm->ndm_flags = fdb->flags;
 287         ndm->ndm_type = RTN_UNICAST;
 288
 289         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 290             nla_put_s32(skb, NDA_LINK_NETNSID,
 291                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 292                 goto nla_put_failure;
 293
 294         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 295                 goto nla_put_failure;
 296
 297         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 298                 goto nla_put_failure;
 299
 300         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
 301             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 302                 goto nla_put_failure;
 303         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 304             nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 305                 goto nla_put_failure;
 306         if ((vxlan->flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
 307             nla_put_u32(skb, NDA_SRC_VNI,
 308                         be32_to_cpu(fdb->vni)))
 309                 goto nla_put_failure;
 310         if (rdst->remote_ifindex &&
 311             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 312                 goto nla_put_failure;
 313
 314         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 315         ci.ndm_confirmed = 0;
 316         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 317         ci.ndm_refcnt    = 0;
 318
 319         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 320                 goto nla_put_failure;
 321
 322         nlmsg_end(skb, nlh);
 323         return 0;
 324
 325 nla_put_failure:
 326         nlmsg_cancel(skb, nlh);
 327         return -EMSGSIZE;
 328 }
 329
 330 static inline size_t vxlan_nlmsg_size(void)
 331 {
 332         return NLMSG_ALIGN(sizeof(struct ndmsg))
 333                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 334                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 335                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 336                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 337                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 338                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 339                 + nla_total_size(sizeof(struct nda_cacheinfo));
 340 }
 341
 342 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 343                              struct vxlan_rdst *rd, int type)
 344 {
 345         struct net *net = dev_net(vxlan->dev);
 346         struct sk_buff *skb;
 347         int err = -ENOBUFS;
 348
 349         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 350         if (skb == NULL)
 351                 goto errout;
 352
 353         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 354         if (err < 0) {
 355                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 356                 WARN_ON(err == -EMSGSIZE);
 357                 kfree_skb(skb);
 358                 goto errout;
 359         }
 360
 361         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 362         return;
 363 errout:
 364         if (err < 0)
 365                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 366 }
 367
 368 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 369 {
 370         struct vxlan_dev *vxlan = netdev_priv(dev);
 371         struct vxlan_fdb f = {
 372                 .state = NUD_STALE,
 373         };
 374         struct vxlan_rdst remote = {
 375                 .remote_ip = *ipa, /* goes to NDA_DST */
 376                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 377         };
 378
 379         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 380 }
 381
 382 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 383 {
 384         struct vxlan_fdb f = {
 385                 .state = NUD_STALE,
 386         };
 387         struct vxlan_rdst remote = { };
 388
 389         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 390
 391         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 392 }
 393
 394 /* Hash Ethernet address */
 395 static u32 eth_hash(const unsigned char *addr)
 396 {
 397         u64 value = get_unaligned((u64 *)addr);
 398
 399         /* only want 6 bytes */
 400 #ifdef __BIG_ENDIAN
 401         value >>= 16;
 402 #else
 403         value <<= 16;
 404 #endif
 405         return hash_64(value, FDB_HASH_BITS);
 406 }
 407
 408 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
 409 {
 410         /* use 1 byte of OUI and 3 bytes of NIC */
 411         u32 key = get_unaligned((u32 *)(addr + 2));
 412
 413         return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
 414 }
 415
 416 /* Hash chain to use given mac address */
 417 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 418                                                 const u8 *mac, __be32 vni)
 419 {
 420         if (vxlan->flags & VXLAN_F_COLLECT_METADATA)
 421                 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
 422         else
 423                 return &vxlan->fdb_head[eth_hash(mac)];
 424 }
 425
 426 /* Look up Ethernet address in forwarding table */
 427 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 428                                           const u8 *mac, __be32 vni)
 429 {
 430         struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
 431         struct vxlan_fdb *f;
 432
 433         hlist_for_each_entry_rcu(f, head, hlist) {
 434                 if (ether_addr_equal(mac, f->eth_addr)) {
 435                         if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
 436                                 if (vni == f->vni)
 437                                         return f;
 438                         } else {
 439                                 return f;
 440                         }
 441                 }
 442         }
 443
 444         return NULL;
 445 }
 446
 447 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 448                                         const u8 *mac, __be32 vni)
 449 {
 450         struct vxlan_fdb *f;
 451
 452         f = __vxlan_find_mac(vxlan, mac, vni);
 453         if (f)
 454                 f->used = jiffies;
 455
 456         return f;
 457 }
 458
 459 /* caller should hold vxlan->hash_lock */
 460 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 461                                               union vxlan_addr *ip, __be16 port,
 462                                               __be32 vni, __u32 ifindex)
 463 {
 464         struct vxlan_rdst *rd;
 465
 466         list_for_each_entry(rd, &f->remotes, list) {
 467                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 468                     rd->remote_port == port &&
 469                     rd->remote_vni == vni &&
 470                     rd->remote_ifindex == ifindex)
 471                         return rd;
 472         }
 473
 474         return NULL;
 475 }
 476
 477 /* Replace destination of unicast mac */
 478 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 479                              union vxlan_addr *ip, __be16 port, __be32 vni,
 480                              __u32 ifindex)
 481 {
 482         struct vxlan_rdst *rd;
 483
 484         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 485         if (rd)
 486                 return 0;
 487
 488         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 489         if (!rd)
 490                 return 0;
 491
 492         dst_cache_reset(&rd->dst_cache);
 493         rd->remote_ip = *ip;
 494         rd->remote_port = port;
 495         rd->remote_vni = vni;
 496         rd->remote_ifindex = ifindex;
 497         return 1;
 498 }
 499
 500 /* Add/update destinations for multicast */
 501 static int vxlan_fdb_append(struct vxlan_fdb *f,
 502                             union vxlan_addr *ip, __be16 port, __be32 vni,
 503                             __u32 ifindex, struct vxlan_rdst **rdp)
 504 {
 505         struct vxlan_rdst *rd;
 506
 507         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 508         if (rd)
 509                 return 0;
 510
 511         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 512         if (rd == NULL)
 513                 return -ENOBUFS;
 514
 515         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 516                 kfree(rd);
 517                 return -ENOBUFS;
 518         }
 519
 520         rd->remote_ip = *ip;
 521         rd->remote_port = port;
 522         rd->remote_vni = vni;
 523         rd->remote_ifindex = ifindex;
 524
 525         list_add_tail_rcu(&rd->list, &f->remotes);
 526
 527         *rdp = rd;
 528         return 1;
 529 }
 530
 531 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 532                                           unsigned int off,
 533                                           struct vxlanhdr *vh, size_t hdrlen,
 534                                           __be32 vni_field,
 535                                           struct gro_remcsum *grc,
 536                                           bool nopartial)
 537 {
 538         size_t start, offset;
 539
 540         if (skb->remcsum_offload)
 541                 return vh;
 542
 543         if (!NAPI_GRO_CB(skb)->csum_valid)
 544                 return NULL;
 545
 546         start = vxlan_rco_start(vni_field);
 547         offset = start + vxlan_rco_offset(vni_field);
 548
 549         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 550                                      start, offset, grc, nopartial);
 551
 552         skb->remcsum_offload = 1;
 553
 554         return vh;
 555 }
 556
 557 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
 558                                           struct sk_buff **head,
 559                                           struct sk_buff *skb)
 560 {
 561         struct sk_buff *p, **pp = NULL;
 562         struct vxlanhdr *vh, *vh2;
 563         unsigned int hlen, off_vx;
 564         int flush = 1;
 565         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
 566         __be32 flags;
 567         struct gro_remcsum grc;
 568
 569         skb_gro_remcsum_init(&grc);
 570
 571         off_vx = skb_gro_offset(skb);
 572         hlen = off_vx + sizeof(*vh);
 573         vh   = skb_gro_header_fast(skb, off_vx);
 574         if (skb_gro_header_hard(skb, hlen)) {
 575                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 576                 if (unlikely(!vh))
 577                         goto out;
 578         }
 579
 580         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 581
 582         flags = vh->vx_flags;
 583
 584         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 585                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 586                                        vh->vx_vni, &grc,
 587                                        !!(vs->flags &
 588                                           VXLAN_F_REMCSUM_NOPARTIAL));
 589
 590                 if (!vh)
 591                         goto out;
 592         }
 593
 594         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 595
 596         for (p = *head; p; p = p->next) {
 597                 if (!NAPI_GRO_CB(p)->same_flow)
 598                         continue;
 599
 600                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 601                 if (vh->vx_flags != vh2->vx_flags ||
 602                     vh->vx_vni != vh2->vx_vni) {
 603                         NAPI_GRO_CB(p)->same_flow = 0;
 604                         continue;
 605                 }
 606         }
 607
 608         pp = call_gro_receive(eth_gro_receive, head, skb);
 609         flush = 0;
 610
 611 out:
 612         skb_gro_remcsum_cleanup(skb, &grc);
 613         NAPI_GRO_CB(skb)->flush |= flush;
 614
 615         return pp;
 616 }
 617
 618 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 619 {
 620         /* Sets 'skb->inner_mac_header' since we are always called with
 621          * 'skb->encapsulation' set.
 622          */
 623         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 624 }
 625
 626 /* Add new entry to forwarding table -- assumes lock held */
 627 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 628                             const u8 *mac, union vxlan_addr *ip,
 629                             __u16 state, __u16 flags,
 630                             __be16 port, __be32 src_vni, __be32 vni,
 631                             __u32 ifindex, __u8 ndm_flags)
 632 {
 633         struct vxlan_rdst *rd = NULL;
 634         struct vxlan_fdb *f;
 635         int notify = 0;
 636         int rc;
 637
 638         f = __vxlan_find_mac(vxlan, mac, src_vni);
 639         if (f) {
 640                 if (flags & NLM_F_EXCL) {
 641                         netdev_dbg(vxlan->dev,
 642                                    "lost race to create %pM\n", mac);
 643                         return -EEXIST;
 644                 }
 645                 if (f->state != state) {
 646                         f->state = state;
 647                         f->updated = jiffies;
 648                         notify = 1;
 649                 }
 650                 if (f->flags != ndm_flags) {
 651                         f->flags = ndm_flags;
 652                         f->updated = jiffies;
 653                         notify = 1;
 654                 }
 655                 if ((flags & NLM_F_REPLACE)) {
 656                         /* Only change unicasts */
 657                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 658                              is_zero_ether_addr(f->eth_addr))) {
 659                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
 660                                                            ifindex);
 661                         } else
 662                                 return -EOPNOTSUPP;
 663                 }
 664                 if ((flags & NLM_F_APPEND) &&
 665                     (is_multicast_ether_addr(f->eth_addr) ||
 666                      is_zero_ether_addr(f->eth_addr))) {
 667                         rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 668
 669                         if (rc < 0)
 670                                 return rc;
 671                         notify |= rc;
 672                 }
 673         } else {
 674                 if (!(flags & NLM_F_CREATE))
 675                         return -ENOENT;
 676
 677                 if (vxlan->cfg.addrmax &&
 678                     vxlan->addrcnt >= vxlan->cfg.addrmax)
 679                         return -ENOSPC;
 680
 681                 /* Disallow replace to add a multicast entry */
 682                 if ((flags & NLM_F_REPLACE) &&
 683                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 684                         return -EOPNOTSUPP;
 685
 686                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 687                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 688                 if (!f)
 689                         return -ENOMEM;
 690
 691                 notify = 1;
 692                 f->state = state;
 693                 f->flags = ndm_flags;
 694                 f->updated = f->used = jiffies;
 695                 f->vni = src_vni;
 696                 INIT_LIST_HEAD(&f->remotes);
 697                 memcpy(f->eth_addr, mac, ETH_ALEN);
 698
 699                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 700                 if (rc < 0) {
 701                         kfree(f);
 702                         return rc;
 703                 }
 704
 705                 ++vxlan->addrcnt;
 706                 hlist_add_head_rcu(&f->hlist,
 707                                    vxlan_fdb_head(vxlan, mac, src_vni));
 708         }
 709
 710         if (notify) {
 711                 if (rd == NULL)
 712                         rd = first_remote_rtnl(f);
 713                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 714         }
 715
 716         return 0;
 717 }
 718
 719 static void vxlan_fdb_free(struct rcu_head *head)
 720 {
 721         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 722         struct vxlan_rdst *rd, *nd;
 723
 724         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 725                 dst_cache_destroy(&rd->dst_cache);
 726                 kfree(rd);
 727         }
 728         kfree(f);
 729 }
 730
 731 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 732 {
 733         netdev_dbg(vxlan->dev,
 734                     "delete %pM\n", f->eth_addr);
 735
 736         --vxlan->addrcnt;
 737         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 738
 739         hlist_del_rcu(&f->hlist);
 740         call_rcu(&f->rcu, vxlan_fdb_free);
 741 }
 742
 743 static void vxlan_dst_free(struct rcu_head *head)
 744 {
 745         struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
 746
 747         dst_cache_destroy(&rd->dst_cache);
 748         kfree(rd);
 749 }
 750
 751 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
 752                                   struct vxlan_rdst *rd)
 753 {
 754         list_del_rcu(&rd->list);
 755         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 756         call_rcu(&rd->rcu, vxlan_dst_free);
 757 }
 758
 759 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 760                            union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
 761                            __be32 *vni, u32 *ifindex)
 762 {
 763         struct net *net = dev_net(vxlan->dev);
 764         int err;
 765
 766         if (tb[NDA_DST]) {
 767                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 768                 if (err)
 769                         return err;
 770         } else {
 771                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 772                 if (remote->sa.sa_family == AF_INET) {
 773                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 774                         ip->sa.sa_family = AF_INET;
 775 #if IS_ENABLED(CONFIG_IPV6)
 776                 } else {
 777                         ip->sin6.sin6_addr = in6addr_any;
 778                         ip->sa.sa_family = AF_INET6;
 779 #endif
 780                 }
 781         }
 782
 783         if (tb[NDA_PORT]) {
 784                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 785                         return -EINVAL;
 786                 *port = nla_get_be16(tb[NDA_PORT]);
 787         } else {
 788                 *port = vxlan->cfg.dst_port;
 789         }
 790
 791         if (tb[NDA_VNI]) {
 792                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 793                         return -EINVAL;
 794                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
 795         } else {
 796                 *vni = vxlan->default_dst.remote_vni;
 797         }
 798
 799         if (tb[NDA_SRC_VNI]) {
 800                 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
 801                         return -EINVAL;
 802                 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
 803         } else {
 804                 *src_vni = vxlan->default_dst.remote_vni;
 805         }
 806
 807         if (tb[NDA_IFINDEX]) {
 808                 struct net_device *tdev;
 809
 810                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 811                         return -EINVAL;
 812                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 813                 tdev = __dev_get_by_index(net, *ifindex);
 814                 if (!tdev)
 815                         return -EADDRNOTAVAIL;
 816         } else {
 817                 *ifindex = 0;
 818         }
 819
 820         return 0;
 821 }
 822
 823 /* Add static entry (via netlink) */
 824 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 825                          struct net_device *dev,
 826                          const unsigned char *addr, u16 vid, u16 flags)
 827 {
 828         struct vxlan_dev *vxlan = netdev_priv(dev);
 829         /* struct net *net = dev_net(vxlan->dev); */
 830         union vxlan_addr ip;
 831         __be16 port;
 832         __be32 src_vni, vni;
 833         u32 ifindex;
 834         int err;
 835
 836         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 837                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 838                         ndm->ndm_state);
 839                 return -EINVAL;
 840         }
 841
 842         if (tb[NDA_DST] == NULL)
 843                 return -EINVAL;
 844
 845         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
 846         if (err)
 847                 return err;
 848
 849         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 850                 return -EAFNOSUPPORT;
 851
 852         spin_lock_bh(&vxlan->hash_lock);
 853         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 854                                port, src_vni, vni, ifindex, ndm->ndm_flags);
 855         spin_unlock_bh(&vxlan->hash_lock);
 856
 857         return err;
 858 }
 859
 860 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
 861                               const unsigned char *addr, union vxlan_addr ip,
 862                               __be16 port, __be32 src_vni, u32 vni, u32 ifindex,
 863                               u16 vid)
 864 {
 865         struct vxlan_fdb *f;
 866         struct vxlan_rdst *rd = NULL;
 867         int err = -ENOENT;
 868
 869         f = vxlan_find_mac(vxlan, addr, src_vni);
 870         if (!f)
 871                 return err;
 872
 873         if (!vxlan_addr_any(&ip)) {
 874                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 875                 if (!rd)
 876                         goto out;
 877         }
 878
 879         /* remove a destination if it's not the only one on the list,
 880          * otherwise destroy the fdb entry
 881          */
 882         if (rd && !list_is_singular(&f->remotes)) {
 883                 vxlan_fdb_dst_destroy(vxlan, f, rd);
 884                 goto out;
 885         }
 886
 887         vxlan_fdb_destroy(vxlan, f);
 888
 889 out:
 890         return 0;
 891 }
 892
 893 /* Delete entry (via netlink) */
 894 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 895                             struct net_device *dev,
 896                             const unsigned char *addr, u16 vid)
 897 {
 898         struct vxlan_dev *vxlan = netdev_priv(dev);
 899         union vxlan_addr ip;
 900         __be32 src_vni, vni;
 901         __be16 port;
 902         u32 ifindex;
 903         int err;
 904
 905         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
 906         if (err)
 907                 return err;
 908
 909         spin_lock_bh(&vxlan->hash_lock);
 910         err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
 911                                  vid);
 912         spin_unlock_bh(&vxlan->hash_lock);
 913
 914         return err;
 915 }
 916
 917 /* Dump forwarding table */
 918 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 919                           struct net_device *dev,
 920                           struct net_device *filter_dev, int *idx)
 921 {
 922         struct vxlan_dev *vxlan = netdev_priv(dev);
 923         unsigned int h;
 924         int err = 0;
 925
 926         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 927                 struct vxlan_fdb *f;
 928
 929                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 930                         struct vxlan_rdst *rd;
 931
 932                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 933                                 if (*idx < cb->args[2])
 934                                         goto skip;
 935
 936                                 err = vxlan_fdb_info(skb, vxlan, f,
 937                                                      NETLINK_CB(cb->skb).portid,
 938                                                      cb->nlh->nlmsg_seq,
 939                                                      RTM_NEWNEIGH,
 940                                                      NLM_F_MULTI, rd);
 941                                 if (err < 0)
 942                                         goto out;
 943 skip:
 944                                 *idx += 1;
 945                         }
 946                 }
 947         }
 948 out:
 949         return err;
 950 }
 951
 952 /* Watch incoming packets to learn mapping between Ethernet address
 953  * and Tunnel endpoint.
 954  * Return true if packet is bogus and should be dropped.
 955  */
 956 static bool vxlan_snoop(struct net_device *dev,
 957                         union vxlan_addr *src_ip, const u8 *src_mac,
 958                         __be32 vni)
 959 {
 960         struct vxlan_dev *vxlan = netdev_priv(dev);
 961         struct vxlan_fdb *f;
 962
 963         f = vxlan_find_mac(vxlan, src_mac, vni);
 964         if (likely(f)) {
 965                 struct vxlan_rdst *rdst = first_remote_rcu(f);
 966
 967                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
 968                         return false;
 969
 970                 /* Don't migrate static entries, drop packets */
 971                 if (f->state & NUD_NOARP)
 972                         return true;
 973
 974                 if (net_ratelimit())
 975                         netdev_info(dev,
 976                                     "%pM migrated from %pIS to %pIS\n",
 977                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
 978
 979                 rdst->remote_ip = *src_ip;
 980                 f->updated = jiffies;
 981                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
 982         } else {
 983                 /* learned new entry */
 984                 spin_lock(&vxlan->hash_lock);
 985
 986                 /* close off race between vxlan_flush and incoming packets */
 987                 if (netif_running(dev))
 988                         vxlan_fdb_create(vxlan, src_mac, src_ip,
 989                                          NUD_REACHABLE,
 990                                          NLM_F_EXCL|NLM_F_CREATE,
 991                                          vxlan->cfg.dst_port,
 992                                          vni,
 993                                          vxlan->default_dst.remote_vni,
 994                                          0, NTF_SELF);
 995                 spin_unlock(&vxlan->hash_lock);
 996         }
 997
 998         return false;
 999 }
1000
1001 /* See if multicast group is already in use by other ID */
1002 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1003 {
1004         struct vxlan_dev *vxlan;
1005         struct vxlan_sock *sock4;
1006 #if IS_ENABLED(CONFIG_IPV6)
1007         struct vxlan_sock *sock6;
1008 #endif
1009         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1010
1011         sock4 = rtnl_dereference(dev->vn4_sock);
1012
1013         /* The vxlan_sock is only used by dev, leaving group has
1014          * no effect on other vxlan devices.
1015          */
1016         if (family == AF_INET && sock4 && atomic_read(&sock4->refcnt) == 1)
1017                 return false;
1018 #if IS_ENABLED(CONFIG_IPV6)
1019         sock6 = rtnl_dereference(dev->vn6_sock);
1020         if (family == AF_INET6 && sock6 && atomic_read(&sock6->refcnt) == 1)
1021                 return false;
1022 #endif
1023
1024         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1025                 if (!netif_running(vxlan->dev) || vxlan == dev)
1026                         continue;
1027
1028                 if (family == AF_INET &&
1029                     rtnl_dereference(vxlan->vn4_sock) != sock4)
1030                         continue;
1031 #if IS_ENABLED(CONFIG_IPV6)
1032                 if (family == AF_INET6 &&
1033                     rtnl_dereference(vxlan->vn6_sock) != sock6)
1034                         continue;
1035 #endif
1036
1037                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1038                                       &dev->default_dst.remote_ip))
1039                         continue;
1040
1041                 if (vxlan->default_dst.remote_ifindex !=
1042                     dev->default_dst.remote_ifindex)
1043                         continue;
1044
1045                 return true;
1046         }
1047
1048         return false;
1049 }
1050
1051 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1052 {
1053         struct vxlan_net *vn;
1054
1055         if (!vs)
1056                 return false;
1057         if (!atomic_dec_and_test(&vs->refcnt))
1058                 return false;
1059
1060         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1061         spin_lock(&vn->sock_lock);
1062         hlist_del_rcu(&vs->hlist);
1063         udp_tunnel_notify_del_rx_port(vs->sock,
1064                                       (vs->flags & VXLAN_F_GPE) ?
1065                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
1066                                       UDP_TUNNEL_TYPE_VXLAN);
1067         spin_unlock(&vn->sock_lock);
1068
1069         return true;
1070 }
1071
1072 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1073 {
1074         struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1075 #if IS_ENABLED(CONFIG_IPV6)
1076         struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1077
1078         rcu_assign_pointer(vxlan->vn6_sock, NULL);
1079 #endif
1080
1081         rcu_assign_pointer(vxlan->vn4_sock, NULL);
1082         synchronize_net();
1083
1084         if (__vxlan_sock_release_prep(sock4)) {
1085                 udp_tunnel_sock_release(sock4->sock);
1086                 kfree(sock4);
1087         }
1088
1089 #if IS_ENABLED(CONFIG_IPV6)
1090         if (__vxlan_sock_release_prep(sock6)) {
1091                 udp_tunnel_sock_release(sock6->sock);
1092                 kfree(sock6);
1093         }
1094 #endif
1095 }
1096
1097 /* Update multicast group membership when first VNI on
1098  * multicast address is brought up
1099  */
1100 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1101 {
1102         struct sock *sk;
1103         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1104         int ifindex = vxlan->default_dst.remote_ifindex;
1105         int ret = -EINVAL;
1106
1107         if (ip->sa.sa_family == AF_INET) {
1108                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1109                 struct ip_mreqn mreq = {
1110                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1111                         .imr_ifindex            = ifindex,
1112                 };
1113
1114                 sk = sock4->sock->sk;
1115                 lock_sock(sk);
1116                 ret = ip_mc_join_group(sk, &mreq);
1117                 release_sock(sk);
1118 #if IS_ENABLED(CONFIG_IPV6)
1119         } else {
1120                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1121
1122                 sk = sock6->sock->sk;
1123                 lock_sock(sk);
1124                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1125                                                    &ip->sin6.sin6_addr);
1126                 release_sock(sk);
1127 #endif
1128         }
1129
1130         return ret;
1131 }
1132
1133 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1134 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1135 {
1136         struct sock *sk;
1137         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1138         int ifindex = vxlan->default_dst.remote_ifindex;
1139         int ret = -EINVAL;
1140
1141         if (ip->sa.sa_family == AF_INET) {
1142                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1143                 struct ip_mreqn mreq = {
1144                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1145                         .imr_ifindex            = ifindex,
1146                 };
1147
1148                 sk = sock4->sock->sk;
1149                 lock_sock(sk);
1150                 ret = ip_mc_leave_group(sk, &mreq);
1151                 release_sock(sk);
1152 #if IS_ENABLED(CONFIG_IPV6)
1153         } else {
1154                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1155
1156                 sk = sock6->sock->sk;
1157                 lock_sock(sk);
1158                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1159                                                    &ip->sin6.sin6_addr);
1160                 release_sock(sk);
1161 #endif
1162         }
1163
1164         return ret;
1165 }
1166
1167 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1168                           struct sk_buff *skb, u32 vxflags)
1169 {
1170         size_t start, offset;
1171
1172         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1173                 goto out;
1174
1175         start = vxlan_rco_start(unparsed->vx_vni);
1176         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1177
1178         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1179                 return false;
1180
1181         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1182                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1183 out:
1184         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1185         unparsed->vx_vni &= VXLAN_VNI_MASK;
1186         return true;
1187 }
1188
1189 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1190                                 struct sk_buff *skb, u32 vxflags,
1191                                 struct vxlan_metadata *md)
1192 {
1193         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1194         struct metadata_dst *tun_dst;
1195
1196         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1197                 goto out;
1198
1199         md->gbp = ntohs(gbp->policy_id);
1200
1201         tun_dst = (struct metadata_dst *)skb_dst(skb);
1202         if (tun_dst) {
1203                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1204                 tun_dst->u.tun_info.options_len = sizeof(*md);
1205         }
1206         if (gbp->dont_learn)
1207                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1208
1209         if (gbp->policy_applied)
1210                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1211
1212         /* In flow-based mode, GBP is carried in dst_metadata */
1213         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1214                 skb->mark = md->gbp;
1215 out:
1216         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1217 }
1218
1219 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1220                                 __be16 *protocol,
1221                                 struct sk_buff *skb, u32 vxflags)
1222 {
1223         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1224
1225         /* Need to have Next Protocol set for interfaces in GPE mode. */
1226         if (!gpe->np_applied)
1227                 return false;
1228         /* "The initial version is 0. If a receiver does not support the
1229          * version indicated it MUST drop the packet.
1230          */
1231         if (gpe->version != 0)
1232                 return false;
1233         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1234          * processing MUST occur." However, we don't implement OAM
1235          * processing, thus drop the packet.
1236          */
1237         if (gpe->oam_flag)
1238                 return false;
1239
1240         switch (gpe->next_protocol) {
1241         case VXLAN_GPE_NP_IPV4:
1242                 *protocol = htons(ETH_P_IP);
1243                 break;
1244         case VXLAN_GPE_NP_IPV6:
1245                 *protocol = htons(ETH_P_IPV6);
1246                 break;
1247         case VXLAN_GPE_NP_ETHERNET:
1248                 *protocol = htons(ETH_P_TEB);
1249                 break;
1250         default:
1251                 return false;
1252         }
1253
1254         unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1255         return true;
1256 }
1257
1258 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1259                           struct vxlan_sock *vs,
1260                           struct sk_buff *skb, __be32 vni)
1261 {
1262         union vxlan_addr saddr;
1263
1264         skb_reset_mac_header(skb);
1265         skb->protocol = eth_type_trans(skb, vxlan->dev);
1266         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1267
1268         /* Ignore packet loops (and multicast echo) */
1269         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1270                 return false;
1271
1272         /* Get address from the outer IP header */
1273         if (vxlan_get_sk_family(vs) == AF_INET) {
1274                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1275                 saddr.sa.sa_family = AF_INET;
1276 #if IS_ENABLED(CONFIG_IPV6)
1277         } else {
1278                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1279                 saddr.sa.sa_family = AF_INET6;
1280 #endif
1281         }
1282
1283         if ((vxlan->flags & VXLAN_F_LEARN) &&
1284             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, vni))
1285                 return false;
1286
1287         return true;
1288 }
1289
1290 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1291                                   struct sk_buff *skb)
1292 {
1293         int err = 0;
1294
1295         if (vxlan_get_sk_family(vs) == AF_INET)
1296                 err = IP_ECN_decapsulate(oiph, skb);
1297 #if IS_ENABLED(CONFIG_IPV6)
1298         else
1299                 err = IP6_ECN_decapsulate(oiph, skb);
1300 #endif
1301
1302         if (unlikely(err) && log_ecn_error) {
1303                 if (vxlan_get_sk_family(vs) == AF_INET)
1304                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1305                                              &((struct iphdr *)oiph)->saddr,
1306                                              ((struct iphdr *)oiph)->tos);
1307                 else
1308                         net_info_ratelimited("non-ECT from %pI6\n",
1309                                              &((struct ipv6hdr *)oiph)->saddr);
1310         }
1311         return err <= 1;
1312 }
1313
1314 /* Callback from net/ipv4/udp.c to receive packets */
1315 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1316 {
1317         struct pcpu_sw_netstats *stats;
1318         struct vxlan_dev *vxlan;
1319         struct vxlan_sock *vs;
1320         struct vxlanhdr unparsed;
1321         struct vxlan_metadata _md;
1322         struct vxlan_metadata *md = &_md;
1323         __be16 protocol = htons(ETH_P_TEB);
1324         bool raw_proto = false;
1325         void *oiph;
1326         __be32 vni = 0;
1327
1328         /* Need UDP and VXLAN header to be present */
1329         if (!pskb_may_pull(skb, VXLAN_HLEN))
1330                 goto drop;
1331
1332         unparsed = *vxlan_hdr(skb);
1333         /* VNI flag always required to be set */
1334         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1335                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1336                            ntohl(vxlan_hdr(skb)->vx_flags),
1337                            ntohl(vxlan_hdr(skb)->vx_vni));
1338                 /* Return non vxlan pkt */
1339                 goto drop;
1340         }
1341         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1342         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1343
1344         vs = rcu_dereference_sk_user_data(sk);
1345         if (!vs)
1346                 goto drop;
1347
1348         vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1349
1350         vxlan = vxlan_vs_find_vni(vs, vni);
1351         if (!vxlan)
1352                 goto drop;
1353
1354         /* For backwards compatibility, only allow reserved fields to be
1355          * used by VXLAN extensions if explicitly requested.
1356          */
1357         if (vs->flags & VXLAN_F_GPE) {
1358                 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1359                         goto drop;
1360                 raw_proto = true;
1361         }
1362
1363         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1364                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1365                         goto drop;
1366
1367         if (vxlan_collect_metadata(vs)) {
1368                 struct metadata_dst *tun_dst;
1369
1370                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1371                                          key32_to_tunnel_id(vni), sizeof(*md));
1372
1373                 if (!tun_dst)
1374                         goto drop;
1375
1376                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1377
1378                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1379         } else {
1380                 memset(md, 0, sizeof(*md));
1381         }
1382
1383         if (vs->flags & VXLAN_F_REMCSUM_RX)
1384                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1385                         goto drop;
1386         if (vs->flags & VXLAN_F_GBP)
1387                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1388         /* Note that GBP and GPE can never be active together. This is
1389          * ensured in vxlan_dev_configure.
1390          */
1391
1392         if (unparsed.vx_flags || unparsed.vx_vni) {
1393                 /* If there are any unprocessed flags remaining treat
1394                  * this as a malformed packet. This behavior diverges from
1395                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1396                  * in reserved fields are to be ignored. The approach here
1397                  * maintains compatibility with previous stack code, and also
1398                  * is more robust and provides a little more security in
1399                  * adding extensions to VXLAN.
1400                  */
1401                 goto drop;
1402         }
1403
1404         if (!raw_proto) {
1405                 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1406                         goto drop;
1407         } else {
1408                 skb_reset_mac_header(skb);
1409                 skb->dev = vxlan->dev;
1410                 skb->pkt_type = PACKET_HOST;
1411         }
1412
1413         oiph = skb_network_header(skb);
1414         skb_reset_network_header(skb);
1415
1416         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1417                 ++vxlan->dev->stats.rx_frame_errors;
1418                 ++vxlan->dev->stats.rx_errors;
1419                 goto drop;
1420         }
1421
1422         stats = this_cpu_ptr(vxlan->dev->tstats);
1423         u64_stats_update_begin(&stats->syncp);
1424         stats->rx_packets++;
1425         stats->rx_bytes += skb->len;
1426         u64_stats_update_end(&stats->syncp);
1427
1428         gro_cells_receive(&vxlan->gro_cells, skb);
1429         return 0;
1430
1431 drop:
1432         /* Consume bad packet */
1433         kfree_skb(skb);
1434         return 0;
1435 }
1436
1437 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1438 {
1439         struct vxlan_dev *vxlan = netdev_priv(dev);
1440         struct arphdr *parp;
1441         u8 *arpptr, *sha;
1442         __be32 sip, tip;
1443         struct neighbour *n;
1444
1445         if (dev->flags & IFF_NOARP)
1446                 goto out;
1447
1448         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1449                 dev->stats.tx_dropped++;
1450                 goto out;
1451         }
1452         parp = arp_hdr(skb);
1453
1454         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1455              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1456             parp->ar_pro != htons(ETH_P_IP) ||
1457             parp->ar_op != htons(ARPOP_REQUEST) ||
1458             parp->ar_hln != dev->addr_len ||
1459             parp->ar_pln != 4)
1460                 goto out;
1461         arpptr = (u8 *)parp + sizeof(struct arphdr);
1462         sha = arpptr;
1463         arpptr += dev->addr_len;        /* sha */
1464         memcpy(&sip, arpptr, sizeof(sip));
1465         arpptr += sizeof(sip);
1466         arpptr += dev->addr_len;        /* tha */
1467         memcpy(&tip, arpptr, sizeof(tip));
1468
1469         if (ipv4_is_loopback(tip) ||
1470             ipv4_is_multicast(tip))
1471                 goto out;
1472
1473         n = neigh_lookup(&arp_tbl, &tip, dev);
1474
1475         if (n) {
1476                 struct vxlan_fdb *f;
1477                 struct sk_buff  *reply;
1478
1479                 if (!(n->nud_state & NUD_CONNECTED)) {
1480                         neigh_release(n);
1481                         goto out;
1482                 }
1483
1484                 f = vxlan_find_mac(vxlan, n->ha, vni);
1485                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1486                         /* bridge-local neighbor */
1487                         neigh_release(n);
1488                         goto out;
1489                 }
1490
1491                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1492                                 n->ha, sha);
1493
1494                 neigh_release(n);
1495
1496                 if (reply == NULL)
1497                         goto out;
1498
1499                 skb_reset_mac_header(reply);
1500                 __skb_pull(reply, skb_network_offset(reply));
1501                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1502                 reply->pkt_type = PACKET_HOST;
1503
1504                 if (netif_rx_ni(reply) == NET_RX_DROP)
1505                         dev->stats.rx_dropped++;
1506         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1507                 union vxlan_addr ipa = {
1508                         .sin.sin_addr.s_addr = tip,
1509                         .sin.sin_family = AF_INET,
1510                 };
1511
1512                 vxlan_ip_miss(dev, &ipa);
1513         }
1514 out:
1515         consume_skb(skb);
1516         return NETDEV_TX_OK;
1517 }
1518
1519 #if IS_ENABLED(CONFIG_IPV6)
1520 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1521         struct neighbour *n, bool isrouter)
1522 {
1523         struct net_device *dev = request->dev;
1524         struct sk_buff *reply;
1525         struct nd_msg *ns, *na;
1526         struct ipv6hdr *pip6;
1527         u8 *daddr;
1528         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1529         int ns_olen;
1530         int i, len;
1531
1532         if (dev == NULL || !pskb_may_pull(request, request->len))
1533                 return NULL;
1534
1535         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1536                 sizeof(*na) + na_olen + dev->needed_tailroom;
1537         reply = alloc_skb(len, GFP_ATOMIC);
1538         if (reply == NULL)
1539                 return NULL;
1540
1541         reply->protocol = htons(ETH_P_IPV6);
1542         reply->dev = dev;
1543         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1544         skb_push(reply, sizeof(struct ethhdr));
1545         skb_reset_mac_header(reply);
1546
1547         ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1548
1549         daddr = eth_hdr(request)->h_source;
1550         ns_olen = request->len - skb_network_offset(request) -
1551                 sizeof(struct ipv6hdr) - sizeof(*ns);
1552         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1553                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1554                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1555                         break;
1556                 }
1557         }
1558
1559         /* Ethernet header */
1560         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1561         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1562         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1563         reply->protocol = htons(ETH_P_IPV6);
1564
1565         skb_pull(reply, sizeof(struct ethhdr));
1566         skb_reset_network_header(reply);
1567         skb_put(reply, sizeof(struct ipv6hdr));
1568
1569         /* IPv6 header */
1570
1571         pip6 = ipv6_hdr(reply);
1572         memset(pip6, 0, sizeof(struct ipv6hdr));
1573         pip6->version = 6;
1574         pip6->priority = ipv6_hdr(request)->priority;
1575         pip6->nexthdr = IPPROTO_ICMPV6;
1576         pip6->hop_limit = 255;
1577         pip6->daddr = ipv6_hdr(request)->saddr;
1578         pip6->saddr = *(struct in6_addr *)n->primary_key;
1579
1580         skb_pull(reply, sizeof(struct ipv6hdr));
1581         skb_reset_transport_header(reply);
1582
1583         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1584
1585         /* Neighbor Advertisement */
1586         memset(na, 0, sizeof(*na)+na_olen);
1587         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1588         na->icmph.icmp6_router = isrouter;
1589         na->icmph.icmp6_override = 1;
1590         na->icmph.icmp6_solicited = 1;
1591         na->target = ns->target;
1592         ether_addr_copy(&na->opt[2], n->ha);
1593         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1594         na->opt[1] = na_olen >> 3;
1595
1596         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1597                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1598                 csum_partial(na, sizeof(*na)+na_olen, 0));
1599
1600         pip6->payload_len = htons(sizeof(*na)+na_olen);
1601
1602         skb_push(reply, sizeof(struct ipv6hdr));
1603
1604         reply->ip_summed = CHECKSUM_UNNECESSARY;
1605
1606         return reply;
1607 }
1608
1609 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1610 {
1611         struct vxlan_dev *vxlan = netdev_priv(dev);
1612         struct nd_msg *msg;
1613         const struct ipv6hdr *iphdr;
1614         const struct in6_addr *daddr;
1615         struct neighbour *n;
1616         struct inet6_dev *in6_dev;
1617
1618         in6_dev = __in6_dev_get(dev);
1619         if (!in6_dev)
1620                 goto out;
1621
1622         if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + sizeof(struct nd_msg)))
1623                 goto out;
1624
1625         iphdr = ipv6_hdr(skb);
1626         daddr = &iphdr->daddr;
1627
1628         msg = (struct nd_msg *)(iphdr + 1);
1629         if (msg->icmph.icmp6_code != 0 ||
1630             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1631                 goto out;
1632
1633         if (ipv6_addr_loopback(daddr) ||
1634             ipv6_addr_is_multicast(&msg->target))
1635                 goto out;
1636
1637         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1638
1639         if (n) {
1640                 struct vxlan_fdb *f;
1641                 struct sk_buff *reply;
1642
1643                 if (!(n->nud_state & NUD_CONNECTED)) {
1644                         neigh_release(n);
1645                         goto out;
1646                 }
1647
1648                 f = vxlan_find_mac(vxlan, n->ha, vni);
1649                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1650                         /* bridge-local neighbor */
1651                         neigh_release(n);
1652                         goto out;
1653                 }
1654
1655                 reply = vxlan_na_create(skb, n,
1656                                         !!(f ? f->flags & NTF_ROUTER : 0));
1657
1658                 neigh_release(n);
1659
1660                 if (reply == NULL)
1661                         goto out;
1662
1663                 if (netif_rx_ni(reply) == NET_RX_DROP)
1664                         dev->stats.rx_dropped++;
1665
1666         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1667                 union vxlan_addr ipa = {
1668                         .sin6.sin6_addr = msg->target,
1669                         .sin6.sin6_family = AF_INET6,
1670                 };
1671
1672                 vxlan_ip_miss(dev, &ipa);
1673         }
1674
1675 out:
1676         consume_skb(skb);
1677         return NETDEV_TX_OK;
1678 }
1679 #endif
1680
1681 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1682 {
1683         struct vxlan_dev *vxlan = netdev_priv(dev);
1684         struct neighbour *n;
1685
1686         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1687                 return false;
1688
1689         n = NULL;
1690         switch (ntohs(eth_hdr(skb)->h_proto)) {
1691         case ETH_P_IP:
1692         {
1693                 struct iphdr *pip;
1694
1695                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1696                         return false;
1697                 pip = ip_hdr(skb);
1698                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1699                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1700                         union vxlan_addr ipa = {
1701                                 .sin.sin_addr.s_addr = pip->daddr,
1702                                 .sin.sin_family = AF_INET,
1703                         };
1704
1705                         vxlan_ip_miss(dev, &ipa);
1706                         return false;
1707                 }
1708
1709                 break;
1710         }
1711 #if IS_ENABLED(CONFIG_IPV6)
1712         case ETH_P_IPV6:
1713         {
1714                 struct ipv6hdr *pip6;
1715
1716                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1717                         return false;
1718                 pip6 = ipv6_hdr(skb);
1719                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1720                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1721                         union vxlan_addr ipa = {
1722                                 .sin6.sin6_addr = pip6->daddr,
1723                                 .sin6.sin6_family = AF_INET6,
1724                         };
1725
1726                         vxlan_ip_miss(dev, &ipa);
1727                         return false;
1728                 }
1729
1730                 break;
1731         }
1732 #endif
1733         default:
1734                 return false;
1735         }
1736
1737         if (n) {
1738                 bool diff;
1739
1740                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1741                 if (diff) {
1742                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1743                                 dev->addr_len);
1744                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1745                 }
1746                 neigh_release(n);
1747                 return diff;
1748         }
1749
1750         return false;
1751 }
1752
1753 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1754                                 struct vxlan_metadata *md)
1755 {
1756         struct vxlanhdr_gbp *gbp;
1757
1758         if (!md->gbp)
1759                 return;
1760
1761         gbp = (struct vxlanhdr_gbp *)vxh;
1762         vxh->vx_flags |= VXLAN_HF_GBP;
1763
1764         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1765                 gbp->dont_learn = 1;
1766
1767         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1768                 gbp->policy_applied = 1;
1769
1770         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1771 }
1772
1773 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1774                                __be16 protocol)
1775 {
1776         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1777
1778         gpe->np_applied = 1;
1779
1780         switch (protocol) {
1781         case htons(ETH_P_IP):
1782                 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1783                 return 0;
1784         case htons(ETH_P_IPV6):
1785                 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1786                 return 0;
1787         case htons(ETH_P_TEB):
1788                 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1789                 return 0;
1790         }
1791         return -EPFNOSUPPORT;
1792 }
1793
1794 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1795                            int iphdr_len, __be32 vni,
1796                            struct vxlan_metadata *md, u32 vxflags,
1797                            bool udp_sum)
1798 {
1799         struct vxlanhdr *vxh;
1800         int min_headroom;
1801         int err;
1802         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1803         __be16 inner_protocol = htons(ETH_P_TEB);
1804
1805         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1806             skb->ip_summed == CHECKSUM_PARTIAL) {
1807                 int csum_start = skb_checksum_start_offset(skb);
1808
1809                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1810                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1811                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1812                      skb->csum_offset == offsetof(struct tcphdr, check)))
1813                         type |= SKB_GSO_TUNNEL_REMCSUM;
1814         }
1815
1816         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1817                         + VXLAN_HLEN + iphdr_len;
1818
1819         /* Need space for new headers (invalidates iph ptr) */
1820         err = skb_cow_head(skb, min_headroom);
1821         if (unlikely(err))
1822                 return err;
1823
1824         err = iptunnel_handle_offloads(skb, type);
1825         if (err)
1826                 return err;
1827
1828         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1829         vxh->vx_flags = VXLAN_HF_VNI;
1830         vxh->vx_vni = vxlan_vni_field(vni);
1831
1832         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1833                 unsigned int start;
1834
1835                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1836                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1837                 vxh->vx_flags |= VXLAN_HF_RCO;
1838
1839                 if (!skb_is_gso(skb)) {
1840                         skb->ip_summed = CHECKSUM_NONE;
1841                         skb->encapsulation = 0;
1842                 }
1843         }
1844
1845         if (vxflags & VXLAN_F_GBP)
1846                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1847         if (vxflags & VXLAN_F_GPE) {
1848                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1849                 if (err < 0)
1850                         return err;
1851                 inner_protocol = skb->protocol;
1852         }
1853
1854         skb_set_inner_protocol(skb, inner_protocol);
1855         return 0;
1856 }
1857
1858 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1859                                       struct vxlan_sock *sock4,
1860                                       struct sk_buff *skb, int oif, u8 tos,
1861                                       __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1862                                       struct dst_cache *dst_cache,
1863                                       const struct ip_tunnel_info *info)
1864 {
1865         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1866         struct rtable *rt = NULL;
1867         struct flowi4 fl4;
1868
1869         if (!sock4)
1870                 return ERR_PTR(-EIO);
1871
1872         if (tos && !info)
1873                 use_cache = false;
1874         if (use_cache) {
1875                 rt = dst_cache_get_ip4(dst_cache, saddr);
1876                 if (rt)
1877                         return rt;
1878         }
1879
1880         memset(&fl4, 0, sizeof(fl4));
1881         fl4.flowi4_oif = oif;
1882         fl4.flowi4_tos = RT_TOS(tos);
1883         fl4.flowi4_mark = skb->mark;
1884         fl4.flowi4_proto = IPPROTO_UDP;
1885         fl4.daddr = daddr;
1886         fl4.saddr = *saddr;
1887         fl4.fl4_dport = dport;
1888         fl4.fl4_sport = sport;
1889
1890         rt = ip_route_output_key(vxlan->net, &fl4);
1891         if (likely(!IS_ERR(rt))) {
1892                 if (rt->dst.dev == dev) {
1893                         netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1894                         ip_rt_put(rt);
1895                         return ERR_PTR(-ELOOP);
1896                 }
1897
1898                 *saddr = fl4.saddr;
1899                 if (use_cache)
1900                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1901         } else {
1902                 netdev_dbg(dev, "no route to %pI4\n", &daddr);
1903                 return ERR_PTR(-ENETUNREACH);
1904         }
1905         return rt;
1906 }
1907
1908 #if IS_ENABLED(CONFIG_IPV6)
1909 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1910                                           struct net_device *dev,
1911                                           struct vxlan_sock *sock6,
1912                                           struct sk_buff *skb, int oif, u8 tos,
1913                                           __be32 label,
1914                                           const struct in6_addr *daddr,
1915                                           struct in6_addr *saddr,
1916                                           __be16 dport, __be16 sport,
1917                                           struct dst_cache *dst_cache,
1918                                           const struct ip_tunnel_info *info)
1919 {
1920         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1921         struct dst_entry *ndst;
1922         struct flowi6 fl6;
1923         int err;
1924
1925         if (!sock6)
1926                 return ERR_PTR(-EIO);
1927
1928         if (tos && !info)
1929                 use_cache = false;
1930         if (use_cache) {
1931                 ndst = dst_cache_get_ip6(dst_cache, saddr);
1932                 if (ndst)
1933                         return ndst;
1934         }
1935
1936         memset(&fl6, 0, sizeof(fl6));
1937         fl6.flowi6_oif = oif;
1938         fl6.daddr = *daddr;
1939         fl6.saddr = *saddr;
1940         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1941         fl6.flowi6_mark = skb->mark;
1942         fl6.flowi6_proto = IPPROTO_UDP;
1943         fl6.fl6_dport = dport;
1944         fl6.fl6_sport = sport;
1945
1946         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1947                                          sock6->sock->sk,
1948                                          &ndst, &fl6);
1949         if (unlikely(err < 0)) {
1950                 netdev_dbg(dev, "no route to %pI6\n", daddr);
1951                 return ERR_PTR(-ENETUNREACH);
1952         }
1953
1954         if (unlikely(ndst->dev == dev)) {
1955                 netdev_dbg(dev, "circular route to %pI6\n", daddr);
1956                 dst_release(ndst);
1957                 return ERR_PTR(-ELOOP);
1958         }
1959
1960         *saddr = fl6.saddr;
1961         if (use_cache)
1962                 dst_cache_set_ip6(dst_cache, ndst, saddr);
1963         return ndst;
1964 }
1965 #endif
1966
1967 /* Bypass encapsulation if the destination is local */
1968 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1969                                struct vxlan_dev *dst_vxlan, __be32 vni)
1970 {
1971         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1972         union vxlan_addr loopback;
1973         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1974         struct net_device *dev = skb->dev;
1975         int len = skb->len;
1976
1977         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1978         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1979         skb->pkt_type = PACKET_HOST;
1980         skb->encapsulation = 0;
1981         skb->dev = dst_vxlan->dev;
1982         __skb_pull(skb, skb_network_offset(skb));
1983
1984         if (remote_ip->sa.sa_family == AF_INET) {
1985                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1986                 loopback.sa.sa_family =  AF_INET;
1987 #if IS_ENABLED(CONFIG_IPV6)
1988         } else {
1989                 loopback.sin6.sin6_addr = in6addr_loopback;
1990                 loopback.sa.sa_family =  AF_INET6;
1991 #endif
1992         }
1993
1994         if (dst_vxlan->flags & VXLAN_F_LEARN)
1995                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source, vni);
1996
1997         u64_stats_update_begin(&tx_stats->syncp);
1998         tx_stats->tx_packets++;
1999         tx_stats->tx_bytes += len;
2000         u64_stats_update_end(&tx_stats->syncp);
2001
2002         if (netif_rx(skb) == NET_RX_SUCCESS) {
2003                 u64_stats_update_begin(&rx_stats->syncp);
2004                 rx_stats->rx_packets++;
2005                 rx_stats->rx_bytes += len;
2006                 u64_stats_update_end(&rx_stats->syncp);
2007         } else {
2008                 dev->stats.rx_dropped++;
2009         }
2010 }
2011
2012 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2013                                  struct vxlan_dev *vxlan, union vxlan_addr *daddr,
2014                                  __be16 dst_port, __be32 vni, struct dst_entry *dst,
2015                                  u32 rt_flags)
2016 {
2017 #if IS_ENABLED(CONFIG_IPV6)
2018         /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2019          * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2020          * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2021          */
2022         BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2023 #endif
2024         /* Bypass encapsulation if the destination is local */
2025         if (rt_flags & RTCF_LOCAL &&
2026             !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2027                 struct vxlan_dev *dst_vxlan;
2028
2029                 dst_release(dst);
2030                 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2031                                            daddr->sa.sa_family, dst_port,
2032                                            vxlan->flags);
2033                 if (!dst_vxlan) {
2034                         dev->stats.tx_errors++;
2035                         kfree_skb(skb);
2036
2037                         return -ENOENT;
2038                 }
2039                 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2040                 return 1;
2041         }
2042
2043         return 0;
2044 }
2045
2046 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2047                            __be32 default_vni, struct vxlan_rdst *rdst,
2048                            bool did_rsc)
2049 {
2050         struct dst_cache *dst_cache;
2051         struct ip_tunnel_info *info;
2052         struct vxlan_dev *vxlan = netdev_priv(dev);
2053         const struct iphdr *old_iph = ip_hdr(skb);
2054         union vxlan_addr *dst;
2055         union vxlan_addr remote_ip, local_ip;
2056         struct vxlan_metadata _md;
2057         struct vxlan_metadata *md = &_md;
2058         __be16 src_port = 0, dst_port;
2059         struct dst_entry *ndst = NULL;
2060         __be32 vni, label;
2061         __u8 tos, ttl;
2062         int err;
2063         u32 flags = vxlan->flags;
2064         bool udp_sum = false;
2065         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2066
2067         info = skb_tunnel_info(skb);
2068
2069         if (rdst) {
2070                 dst = &rdst->remote_ip;
2071                 if (vxlan_addr_any(dst)) {
2072                         if (did_rsc) {
2073                                 /* short-circuited back to local bridge */
2074                                 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2075                                 return;
2076                         }
2077                         goto drop;
2078                 }
2079
2080                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2081                 vni = (rdst->remote_vni) ? : default_vni;
2082                 local_ip = vxlan->cfg.saddr;
2083                 dst_cache = &rdst->dst_cache;
2084                 md->gbp = skb->mark;
2085                 ttl = vxlan->cfg.ttl;
2086                 if (!ttl && vxlan_addr_multicast(dst))
2087                         ttl = 1;
2088
2089                 tos = vxlan->cfg.tos;
2090                 if (tos == 1)
2091                         tos = ip_tunnel_get_dsfield(old_iph, skb);
2092
2093                 if (dst->sa.sa_family == AF_INET)
2094                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2095                 else
2096                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2097                 label = vxlan->cfg.label;
2098         } else {
2099                 if (!info) {
2100                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2101                                   dev->name);
2102                         goto drop;
2103                 }
2104                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2105                 if (remote_ip.sa.sa_family == AF_INET) {
2106                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2107                         local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2108                 } else {
2109                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2110                         local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2111                 }
2112                 dst = &remote_ip;
2113                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2114                 vni = tunnel_id_to_key32(info->key.tun_id);
2115                 dst_cache = &info->dst_cache;
2116                 if (info->options_len)
2117                         md = ip_tunnel_info_opts(info);
2118                 ttl = info->key.ttl;
2119                 tos = info->key.tos;
2120                 label = info->key.label;
2121                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2122         }
2123         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2124                                      vxlan->cfg.port_max, true);
2125
2126         rcu_read_lock();
2127         if (dst->sa.sa_family == AF_INET) {
2128                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2129                 struct rtable *rt;
2130                 __be16 df = 0;
2131
2132                 rt = vxlan_get_route(vxlan, dev, sock4, skb,
2133                                      rdst ? rdst->remote_ifindex : 0, tos,
2134                                      dst->sin.sin_addr.s_addr,
2135                                      &local_ip.sin.sin_addr.s_addr,
2136                                      dst_port, src_port,
2137                                      dst_cache, info);
2138                 if (IS_ERR(rt)) {
2139                         err = PTR_ERR(rt);
2140                         goto tx_error;
2141                 }
2142
2143                 /* Bypass encapsulation if the destination is local */
2144                 if (!info) {
2145                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2146                                                     dst_port, vni, &rt->dst,
2147                                                     rt->rt_flags);
2148                         if (err)
2149                                 goto out_unlock;
2150                 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2151                         df = htons(IP_DF);
2152                 }
2153
2154                 ndst = &rt->dst;
2155                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2156                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2157                 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2158                                       vni, md, flags, udp_sum);
2159                 if (err < 0)
2160                         goto tx_error;
2161
2162                 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2163                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2164                                     src_port, dst_port, xnet, !udp_sum);
2165 #if IS_ENABLED(CONFIG_IPV6)
2166         } else {
2167                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2168
2169                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb,
2170                                         rdst ? rdst->remote_ifindex : 0, tos,
2171                                         label, &dst->sin6.sin6_addr,
2172                                         &local_ip.sin6.sin6_addr,
2173                                         dst_port, src_port,
2174                                         dst_cache, info);
2175                 if (IS_ERR(ndst)) {
2176                         err = PTR_ERR(ndst);
2177                         ndst = NULL;
2178                         goto tx_error;
2179                 }
2180
2181                 if (!info) {
2182                         u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2183
2184                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2185                                                     dst_port, vni, ndst,
2186                                                     rt6i_flags);
2187                         if (err)
2188                                 goto out_unlock;
2189                 }
2190
2191                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2192                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2193                 skb_scrub_packet(skb, xnet);
2194                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2195                                       vni, md, flags, udp_sum);
2196                 if (err < 0)
2197                         goto tx_error;
2198
2199                 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2200                                      &local_ip.sin6.sin6_addr,
2201                                      &dst->sin6.sin6_addr, tos, ttl,
2202                                      label, src_port, dst_port, !udp_sum);
2203 #endif
2204         }
2205 out_unlock:
2206         rcu_read_unlock();
2207         return;
2208
2209 drop:
2210         dev->stats.tx_dropped++;
2211         dev_kfree_skb(skb);
2212         return;
2213
2214 tx_error:
2215         rcu_read_unlock();
2216         if (err == -ELOOP)
2217                 dev->stats.collisions++;
2218         else if (err == -ENETUNREACH)
2219                 dev->stats.tx_carrier_errors++;
2220         dst_release(ndst);
2221         dev->stats.tx_errors++;
2222         kfree_skb(skb);
2223 }
2224
2225 /* Transmit local packets over Vxlan
2226  *
2227  * Outer IP header inherits ECN and DF from inner header.
2228  * Outer UDP destination is the VXLAN assigned port.
2229  *           source port is based on hash of flow
2230  */
2231 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2232 {
2233         struct vxlan_dev *vxlan = netdev_priv(dev);
2234         const struct ip_tunnel_info *info;
2235         struct ethhdr *eth;
2236         bool did_rsc = false;
2237         struct vxlan_rdst *rdst, *fdst = NULL;
2238         struct vxlan_fdb *f;
2239         __be32 vni = 0;
2240
2241         info = skb_tunnel_info(skb);
2242
2243         skb_reset_mac_header(skb);
2244
2245         if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2246                 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2247                     info->mode & IP_TUNNEL_INFO_TX) {
2248                         vni = tunnel_id_to_key32(info->key.tun_id);
2249                 } else {
2250                         if (info && info->mode & IP_TUNNEL_INFO_TX)
2251                                 vxlan_xmit_one(skb, dev, vni, NULL, false);
2252                         else
2253                                 kfree_skb(skb);
2254                         return NETDEV_TX_OK;
2255                 }
2256         }
2257
2258         if (vxlan->flags & VXLAN_F_PROXY) {
2259                 eth = eth_hdr(skb);
2260                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2261                         return arp_reduce(dev, skb, vni);
2262 #if IS_ENABLED(CONFIG_IPV6)
2263                 else if (ntohs(eth->h_proto) == ETH_P_IPV6) {
2264                         struct ipv6hdr *hdr, _hdr;
2265                         if ((hdr = skb_header_pointer(skb,
2266                                                       skb_network_offset(skb),
2267                                                       sizeof(_hdr), &_hdr)) &&
2268                             hdr->nexthdr == IPPROTO_ICMPV6)
2269                                 return neigh_reduce(dev, skb, vni);
2270                 }
2271 #endif
2272         }
2273
2274         eth = eth_hdr(skb);
2275         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2276         did_rsc = false;
2277
2278         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2279             (ntohs(eth->h_proto) == ETH_P_IP ||
2280              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2281                 did_rsc = route_shortcircuit(dev, skb);
2282                 if (did_rsc)
2283                         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2284         }
2285
2286         if (f == NULL) {
2287                 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2288                 if (f == NULL) {
2289                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2290                             !is_multicast_ether_addr(eth->h_dest))
2291                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2292
2293                         dev->stats.tx_dropped++;
2294                         kfree_skb(skb);
2295                         return NETDEV_TX_OK;
2296                 }
2297         }
2298
2299         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2300                 struct sk_buff *skb1;
2301
2302                 if (!fdst) {
2303                         fdst = rdst;
2304                         continue;
2305                 }
2306                 skb1 = skb_clone(skb, GFP_ATOMIC);
2307                 if (skb1)
2308                         vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2309         }
2310
2311         if (fdst)
2312                 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2313         else
2314                 kfree_skb(skb);
2315         return NETDEV_TX_OK;
2316 }
2317
2318 /* Walk the forwarding table and purge stale entries */
2319 static void vxlan_cleanup(unsigned long arg)
2320 {
2321         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2322         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2323         unsigned int h;
2324
2325         if (!netif_running(vxlan->dev))
2326                 return;
2327
2328         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2329                 struct hlist_node *p, *n;
2330
2331                 spin_lock_bh(&vxlan->hash_lock);
2332                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2333                         struct vxlan_fdb *f
2334                                 = container_of(p, struct vxlan_fdb, hlist);
2335                         unsigned long timeout;
2336
2337                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2338                                 continue;
2339
2340                         if (f->flags & NTF_EXT_LEARNED)
2341                                 continue;
2342
2343                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2344                         if (time_before_eq(timeout, jiffies)) {
2345                                 netdev_dbg(vxlan->dev,
2346                                            "garbage collect %pM\n",
2347                                            f->eth_addr);
2348                                 f->state = NUD_STALE;
2349                                 vxlan_fdb_destroy(vxlan, f);
2350                         } else if (time_before(timeout, next_timer))
2351                                 next_timer = timeout;
2352                 }
2353                 spin_unlock_bh(&vxlan->hash_lock);
2354         }
2355
2356         mod_timer(&vxlan->age_timer, next_timer);
2357 }
2358
2359 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2360 {
2361         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2362         __be32 vni = vxlan->default_dst.remote_vni;
2363
2364         spin_lock(&vn->sock_lock);
2365         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2366         spin_unlock(&vn->sock_lock);
2367 }
2368
2369 /* Setup stats when device is created */
2370 static int vxlan_init(struct net_device *dev)
2371 {
2372         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2373         if (!dev->tstats)
2374                 return -ENOMEM;
2375
2376         return 0;
2377 }
2378
2379 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2380 {
2381         struct vxlan_fdb *f;
2382
2383         spin_lock_bh(&vxlan->hash_lock);
2384         f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2385         if (f)
2386                 vxlan_fdb_destroy(vxlan, f);
2387         spin_unlock_bh(&vxlan->hash_lock);
2388 }
2389
2390 static void vxlan_uninit(struct net_device *dev)
2391 {
2392         struct vxlan_dev *vxlan = netdev_priv(dev);
2393
2394         vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2395
2396         free_percpu(dev->tstats);
2397 }
2398
2399 /* Start ageing timer and join group when device is brought up */
2400 static int vxlan_open(struct net_device *dev)
2401 {
2402         struct vxlan_dev *vxlan = netdev_priv(dev);
2403         int ret;
2404
2405         ret = vxlan_sock_add(vxlan);
2406         if (ret < 0)
2407                 return ret;
2408
2409         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2410                 ret = vxlan_igmp_join(vxlan);
2411                 if (ret == -EADDRINUSE)
2412                         ret = 0;
2413                 if (ret) {
2414                         vxlan_sock_release(vxlan);
2415                         return ret;
2416                 }
2417         }
2418
2419         if (vxlan->cfg.age_interval)
2420                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2421
2422         return ret;
2423 }
2424
2425 /* Purge the forwarding table */
2426 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2427 {
2428         unsigned int h;
2429
2430         spin_lock_bh(&vxlan->hash_lock);
2431         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2432                 struct hlist_node *p, *n;
2433                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2434                         struct vxlan_fdb *f
2435                                 = container_of(p, struct vxlan_fdb, hlist);
2436                         if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2437                                 continue;
2438                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2439                         if (!is_zero_ether_addr(f->eth_addr))
2440                                 vxlan_fdb_destroy(vxlan, f);
2441                 }
2442         }
2443         spin_unlock_bh(&vxlan->hash_lock);
2444 }
2445
2446 /* Cleanup timer and forwarding table on shutdown */
2447 static int vxlan_stop(struct net_device *dev)
2448 {
2449         struct vxlan_dev *vxlan = netdev_priv(dev);
2450         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2451         int ret = 0;
2452
2453         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2454             !vxlan_group_used(vn, vxlan))
2455                 ret = vxlan_igmp_leave(vxlan);
2456
2457         del_timer_sync(&vxlan->age_timer);
2458
2459         vxlan_flush(vxlan, false);
2460         vxlan_sock_release(vxlan);
2461
2462         return ret;
2463 }
2464
2465 /* Stub, nothing needs to be done. */
2466 static void vxlan_set_multicast_list(struct net_device *dev)
2467 {
2468 }
2469
2470 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2471 {
2472         struct vxlan_dev *vxlan = netdev_priv(dev);
2473         struct vxlan_rdst *dst = &vxlan->default_dst;
2474         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2475                                                          dst->remote_ifindex);
2476         bool use_ipv6 = false;
2477
2478         if (dst->remote_ip.sa.sa_family == AF_INET6)
2479                 use_ipv6 = true;
2480
2481         /* This check is different than dev->max_mtu, because it looks at
2482          * the lowerdev->mtu, rather than the static dev->max_mtu
2483          */
2484         if (lowerdev) {
2485                 int max_mtu = lowerdev->mtu -
2486                               (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2487                 if (new_mtu > max_mtu)
2488                         return -EINVAL;
2489         }
2490
2491         dev->mtu = new_mtu;
2492         return 0;
2493 }
2494
2495 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2496 {
2497         struct vxlan_dev *vxlan = netdev_priv(dev);
2498         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2499         __be16 sport, dport;
2500
2501         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2502                                   vxlan->cfg.port_max, true);
2503         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2504
2505         if (ip_tunnel_info_af(info) == AF_INET) {
2506                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2507                 struct rtable *rt;
2508
2509                 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2510                                      info->key.u.ipv4.dst,
2511                                      &info->key.u.ipv4.src, dport, sport,
2512                                      &info->dst_cache, info);
2513                 if (IS_ERR(rt))
2514                         return PTR_ERR(rt);
2515                 ip_rt_put(rt);
2516         } else {
2517 #if IS_ENABLED(CONFIG_IPV6)
2518                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2519                 struct dst_entry *ndst;
2520
2521                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2522                                         info->key.label, &info->key.u.ipv6.dst,
2523                                         &info->key.u.ipv6.src, dport, sport,
2524                                         &info->dst_cache, info);
2525                 if (IS_ERR(ndst))
2526                         return PTR_ERR(ndst);
2527                 dst_release(ndst);
2528 #else /* !CONFIG_IPV6 */
2529                 return -EPFNOSUPPORT;
2530 #endif
2531         }
2532         info->key.tp_src = sport;
2533         info->key.tp_dst = dport;
2534         return 0;
2535 }
2536
2537 static const struct net_device_ops vxlan_netdev_ether_ops = {
2538         .ndo_init               = vxlan_init,
2539         .ndo_uninit             = vxlan_uninit,
2540         .ndo_open               = vxlan_open,
2541         .ndo_stop               = vxlan_stop,
2542         .ndo_start_xmit         = vxlan_xmit,
2543         .ndo_get_stats64        = ip_tunnel_get_stats64,
2544         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2545         .ndo_change_mtu         = vxlan_change_mtu,
2546         .ndo_validate_addr      = eth_validate_addr,
2547         .ndo_set_mac_address    = eth_mac_addr,
2548         .ndo_fdb_add            = vxlan_fdb_add,
2549         .ndo_fdb_del            = vxlan_fdb_delete,
2550         .ndo_fdb_dump           = vxlan_fdb_dump,
2551         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2552 };
2553
2554 static const struct net_device_ops vxlan_netdev_raw_ops = {
2555         .ndo_init               = vxlan_init,
2556         .ndo_uninit             = vxlan_uninit,
2557         .ndo_open               = vxlan_open,
2558         .ndo_stop               = vxlan_stop,
2559         .ndo_start_xmit         = vxlan_xmit,
2560         .ndo_get_stats64        = ip_tunnel_get_stats64,
2561         .ndo_change_mtu         = vxlan_change_mtu,
2562         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2563 };
2564
2565 /* Info for udev, that this is a virtual tunnel endpoint */
2566 static struct device_type vxlan_type = {
2567         .name = "vxlan",
2568 };
2569
2570 /* Calls the ndo_udp_tunnel_add of the caller in order to
2571  * supply the listening VXLAN udp ports. Callers are expected
2572  * to implement the ndo_udp_tunnel_add.
2573  */
2574 static void vxlan_push_rx_ports(struct net_device *dev)
2575 {
2576         struct vxlan_sock *vs;
2577         struct net *net = dev_net(dev);
2578         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2579         unsigned int i;
2580
2581         spin_lock(&vn->sock_lock);
2582         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2583                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist)
2584                         udp_tunnel_push_rx_port(dev, vs->sock,
2585                                                 (vs->flags & VXLAN_F_GPE) ?
2586                                                 UDP_TUNNEL_TYPE_VXLAN_GPE :
2587                                                 UDP_TUNNEL_TYPE_VXLAN);
2588         }
2589         spin_unlock(&vn->sock_lock);
2590 }
2591
2592 /* Initialize the device structure. */
2593 static void vxlan_setup(struct net_device *dev)
2594 {
2595         struct vxlan_dev *vxlan = netdev_priv(dev);
2596         unsigned int h;
2597
2598         eth_hw_addr_random(dev);
2599         ether_setup(dev);
2600
2601         dev->destructor = free_netdev;
2602         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2603
2604         dev->features   |= NETIF_F_LLTX;
2605         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2606         dev->features   |= NETIF_F_RXCSUM;
2607         dev->features   |= NETIF_F_GSO_SOFTWARE;
2608
2609         dev->vlan_features = dev->features;
2610         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2611         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2612         netif_keep_dst(dev);
2613         dev->priv_flags |= IFF_NO_QUEUE;
2614
2615         INIT_LIST_HEAD(&vxlan->next);
2616         spin_lock_init(&vxlan->hash_lock);
2617
2618         init_timer_deferrable(&vxlan->age_timer);
2619         vxlan->age_timer.function = vxlan_cleanup;
2620         vxlan->age_timer.data = (unsigned long) vxlan;
2621
2622         vxlan->cfg.dst_port = htons(vxlan_port);
2623
2624         vxlan->dev = dev;
2625
2626         gro_cells_init(&vxlan->gro_cells, dev);
2627
2628         for (h = 0; h < FDB_HASH_SIZE; ++h)
2629                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2630 }
2631
2632 static void vxlan_ether_setup(struct net_device *dev)
2633 {
2634         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2635         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2636         dev->netdev_ops = &vxlan_netdev_ether_ops;
2637 }
2638
2639 static void vxlan_raw_setup(struct net_device *dev)
2640 {
2641         dev->header_ops = NULL;
2642         dev->type = ARPHRD_NONE;
2643         dev->hard_header_len = 0;
2644         dev->addr_len = 0;
2645         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2646         dev->netdev_ops = &vxlan_netdev_raw_ops;
2647 }
2648
2649 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2650         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2651         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2652         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2653         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2654         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2655         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2656         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2657         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2658         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
2659         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2660         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2661         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2662         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2663         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2664         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2665         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2666         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2667         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2668         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2669         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2670         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2671         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2672         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2673         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2674         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2675         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
2676         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2677 };
2678
2679 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2680 {
2681         if (tb[IFLA_ADDRESS]) {
2682                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2683                         pr_debug("invalid link address (not ethernet)\n");
2684                         return -EINVAL;
2685                 }
2686
2687                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2688                         pr_debug("invalid all zero ethernet address\n");
2689                         return -EADDRNOTAVAIL;
2690                 }
2691         }
2692
2693         if (!data)
2694                 return -EINVAL;
2695
2696         if (data[IFLA_VXLAN_ID]) {
2697                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2698                 if (id >= VXLAN_N_VID)
2699                         return -ERANGE;
2700         }
2701
2702         if (data[IFLA_VXLAN_PORT_RANGE]) {
2703                 const struct ifla_vxlan_port_range *p
2704                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2705
2706                 if (ntohs(p->high) < ntohs(p->low)) {
2707                         pr_debug("port range %u .. %u not valid\n",
2708                                  ntohs(p->low), ntohs(p->high));
2709                         return -EINVAL;
2710                 }
2711         }
2712
2713         return 0;
2714 }
2715
2716 static void vxlan_get_drvinfo(struct net_device *netdev,
2717                               struct ethtool_drvinfo *drvinfo)
2718 {
2719         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2720         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2721 }
2722
2723 static const struct ethtool_ops vxlan_ethtool_ops = {
2724         .get_drvinfo    = vxlan_get_drvinfo,
2725         .get_link       = ethtool_op_get_link,
2726 };
2727
2728 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2729                                         __be16 port, u32 flags)
2730 {
2731         struct socket *sock;
2732         struct udp_port_cfg udp_conf;
2733         int err;
2734
2735         memset(&udp_conf, 0, sizeof(udp_conf));
2736
2737         if (ipv6) {
2738                 udp_conf.family = AF_INET6;
2739                 udp_conf.use_udp6_rx_checksums =
2740                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2741                 udp_conf.ipv6_v6only = 1;
2742         } else {
2743                 udp_conf.family = AF_INET;
2744         }
2745
2746         udp_conf.local_udp_port = port;
2747
2748         /* Open UDP socket */
2749         err = udp_sock_create(net, &udp_conf, &sock);
2750         if (err < 0)
2751                 return ERR_PTR(err);
2752
2753         return sock;
2754 }
2755
2756 /* Create new listen socket if needed */
2757 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2758                                               __be16 port, u32 flags)
2759 {
2760         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2761         struct vxlan_sock *vs;
2762         struct socket *sock;
2763         unsigned int h;
2764         struct udp_tunnel_sock_cfg tunnel_cfg;
2765
2766         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2767         if (!vs)
2768                 return ERR_PTR(-ENOMEM);
2769
2770         for (h = 0; h < VNI_HASH_SIZE; ++h)
2771                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2772
2773         sock = vxlan_create_sock(net, ipv6, port, flags);
2774         if (IS_ERR(sock)) {
2775                 kfree(vs);
2776                 return ERR_CAST(sock);
2777         }
2778
2779         vs->sock = sock;
2780         atomic_set(&vs->refcnt, 1);
2781         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2782
2783         spin_lock(&vn->sock_lock);
2784         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2785         udp_tunnel_notify_add_rx_port(sock,
2786                                       (vs->flags & VXLAN_F_GPE) ?
2787                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
2788                                       UDP_TUNNEL_TYPE_VXLAN);
2789         spin_unlock(&vn->sock_lock);
2790
2791         /* Mark socket as an encapsulation socket. */
2792         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2793         tunnel_cfg.sk_user_data = vs;
2794         tunnel_cfg.encap_type = 1;
2795         tunnel_cfg.encap_rcv = vxlan_rcv;
2796         tunnel_cfg.encap_destroy = NULL;
2797         tunnel_cfg.gro_receive = vxlan_gro_receive;
2798         tunnel_cfg.gro_complete = vxlan_gro_complete;
2799
2800         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2801
2802         return vs;
2803 }
2804
2805 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2806 {
2807         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2808         struct vxlan_sock *vs = NULL;
2809
2810         if (!vxlan->cfg.no_share) {
2811                 spin_lock(&vn->sock_lock);
2812                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2813                                      vxlan->cfg.dst_port, vxlan->flags);
2814                 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2815                         spin_unlock(&vn->sock_lock);
2816                         return -EBUSY;
2817                 }
2818                 spin_unlock(&vn->sock_lock);
2819         }
2820         if (!vs)
2821                 vs = vxlan_socket_create(vxlan->net, ipv6,
2822                                          vxlan->cfg.dst_port, vxlan->flags);
2823         if (IS_ERR(vs))
2824                 return PTR_ERR(vs);
2825 #if IS_ENABLED(CONFIG_IPV6)
2826         if (ipv6)
2827                 rcu_assign_pointer(vxlan->vn6_sock, vs);
2828         else
2829 #endif
2830                 rcu_assign_pointer(vxlan->vn4_sock, vs);
2831         vxlan_vs_add_dev(vs, vxlan);
2832         return 0;
2833 }
2834
2835 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2836 {
2837         bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2838         bool ipv6 = vxlan->flags & VXLAN_F_IPV6 || metadata;
2839         bool ipv4 = !ipv6 || metadata;
2840         int ret = 0;
2841
2842         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2843 #if IS_ENABLED(CONFIG_IPV6)
2844         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2845         if (ipv6) {
2846                 ret = __vxlan_sock_add(vxlan, true);
2847                 if (ret < 0 && ret != -EAFNOSUPPORT)
2848                         ipv4 = false;
2849         }
2850 #endif
2851         if (ipv4)
2852                 ret = __vxlan_sock_add(vxlan, false);
2853         if (ret < 0)
2854                 vxlan_sock_release(vxlan);
2855         return ret;
2856 }
2857
2858 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2859                                struct vxlan_config *conf,
2860                                bool changelink)
2861 {
2862         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2863         struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2864         struct vxlan_rdst *dst = &vxlan->default_dst;
2865         unsigned short needed_headroom = ETH_HLEN;
2866         bool use_ipv6 = false;
2867         __be16 default_port = vxlan->cfg.dst_port;
2868         struct net_device *lowerdev = NULL;
2869
2870         if (!changelink) {
2871                 if (conf->flags & VXLAN_F_GPE) {
2872                         /* For now, allow GPE only together with
2873                          * COLLECT_METADATA. This can be relaxed later; in such
2874                          * case, the other side of the PtP link will have to be
2875                          * provided.
2876                          */
2877                         if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
2878                             !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2879                                 pr_info("unsupported combination of extensions\n");
2880                                 return -EINVAL;
2881                         }
2882                         vxlan_raw_setup(dev);
2883                 } else {
2884                         vxlan_ether_setup(dev);
2885                 }
2886
2887                 /* MTU range: 68 - 65535 */
2888                 dev->min_mtu = ETH_MIN_MTU;
2889                 dev->max_mtu = ETH_MAX_MTU;
2890                 vxlan->net = src_net;
2891         }
2892
2893         dst->remote_vni = conf->vni;
2894
2895         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2896
2897         /* Unless IPv6 is explicitly requested, assume IPv4 */
2898         if (!dst->remote_ip.sa.sa_family)
2899                 dst->remote_ip.sa.sa_family = AF_INET;
2900
2901         if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2902             vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2903                 if (!IS_ENABLED(CONFIG_IPV6))
2904                         return -EPFNOSUPPORT;
2905                 use_ipv6 = true;
2906                 vxlan->flags |= VXLAN_F_IPV6;
2907         }
2908
2909         if (conf->label && !use_ipv6) {
2910                 pr_info("label only supported in use with IPv6\n");
2911                 return -EINVAL;
2912         }
2913
2914         if (conf->remote_ifindex &&
2915             conf->remote_ifindex != vxlan->cfg.remote_ifindex) {
2916                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2917                 dst->remote_ifindex = conf->remote_ifindex;
2918
2919                 if (!lowerdev) {
2920                         pr_info("ifindex %d does not exist\n",
2921                                 dst->remote_ifindex);
2922                         return -ENODEV;
2923                 }
2924
2925 #if IS_ENABLED(CONFIG_IPV6)
2926                 if (use_ipv6) {
2927                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2928                         if (idev && idev->cnf.disable_ipv6) {
2929                                 pr_info("IPv6 is disabled via sysctl\n");
2930                                 return -EPERM;
2931                         }
2932                 }
2933 #endif
2934
2935                 if (!conf->mtu)
2936                         dev->mtu = lowerdev->mtu -
2937                                    (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2938
2939                 needed_headroom = lowerdev->hard_header_len;
2940         } else if (!conf->remote_ifindex &&
2941                    vxlan_addr_multicast(&dst->remote_ip)) {
2942                 pr_info("multicast destination requires interface to be specified\n");
2943                 return -EINVAL;
2944         }
2945
2946         if (lowerdev) {
2947                 dev->gso_max_size = lowerdev->gso_max_size;
2948                 dev->gso_max_segs = lowerdev->gso_max_segs;
2949         }
2950
2951         if (conf->mtu) {
2952                 int max_mtu = ETH_MAX_MTU;
2953
2954                 if (lowerdev)
2955                         max_mtu = lowerdev->mtu;
2956
2957                 max_mtu -= (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2958
2959                 if (conf->mtu < dev->min_mtu || conf->mtu > dev->max_mtu)
2960                         return -EINVAL;
2961
2962                 dev->mtu = conf->mtu;
2963
2964                 if (conf->mtu > max_mtu)
2965                         dev->mtu = max_mtu;
2966         }
2967
2968         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2969                 needed_headroom += VXLAN6_HEADROOM;
2970         else
2971                 needed_headroom += VXLAN_HEADROOM;
2972         dev->needed_headroom = needed_headroom;
2973
2974         memcpy(&vxlan->cfg, conf, sizeof(*conf));
2975         if (!vxlan->cfg.dst_port) {
2976                 if (conf->flags & VXLAN_F_GPE)
2977                         vxlan->cfg.dst_port = htons(4790); /* IANA VXLAN-GPE port */
2978                 else
2979                         vxlan->cfg.dst_port = default_port;
2980         }
2981         vxlan->flags |= conf->flags;
2982
2983         if (!vxlan->cfg.age_interval)
2984                 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2985
2986         if (changelink)
2987                 return 0;
2988
2989         list_for_each_entry(tmp, &vn->vxlan_list, next) {
2990                 if (tmp->cfg.vni == conf->vni &&
2991                     (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2992                      tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2993                     tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2994                     (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2995                     (vxlan->flags & VXLAN_F_RCV_FLAGS)) {
2996                         pr_info("duplicate VNI %u\n", be32_to_cpu(conf->vni));
2997                         return -EEXIST;
2998                 }
2999         }
3000
3001         return 0;
3002 }
3003
3004 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3005                               struct vxlan_config *conf)
3006 {
3007         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3008         struct vxlan_dev *vxlan = netdev_priv(dev);
3009         int err;
3010
3011         err = vxlan_dev_configure(net, dev, conf, false);
3012         if (err)
3013                 return err;
3014
3015         dev->ethtool_ops = &vxlan_ethtool_ops;
3016
3017         /* create an fdb entry for a valid default destination */
3018         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3019                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3020                                        &vxlan->default_dst.remote_ip,
3021                                        NUD_REACHABLE | NUD_PERMANENT,
3022                                        NLM_F_EXCL | NLM_F_CREATE,
3023                                        vxlan->cfg.dst_port,
3024                                        vxlan->default_dst.remote_vni,
3025                                        vxlan->default_dst.remote_vni,
3026                                        vxlan->default_dst.remote_ifindex,
3027                                        NTF_SELF);
3028                 if (err)
3029                         return err;
3030         }
3031
3032         err = register_netdevice(dev);
3033         if (err) {
3034                 vxlan_fdb_delete_default(vxlan, vxlan->default_dst.remote_vni);
3035                 return err;
3036         }
3037
3038         list_add(&vxlan->next, &vn->vxlan_list);
3039         return 0;
3040 }
3041
3042 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3043                          struct net_device *dev, struct vxlan_config *conf,
3044                          bool changelink)
3045 {
3046         struct vxlan_dev *vxlan = netdev_priv(dev);
3047
3048         memset(conf, 0, sizeof(*conf));
3049
3050         /* if changelink operation, start with old existing cfg */
3051         if (changelink)
3052                 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3053
3054         if (data[IFLA_VXLAN_ID]) {
3055                 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3056
3057                 if (changelink && (vni != conf->vni))
3058                         return -EOPNOTSUPP;
3059                 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3060         }
3061
3062         if (data[IFLA_VXLAN_GROUP]) {
3063                 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3064         } else if (data[IFLA_VXLAN_GROUP6]) {
3065                 if (!IS_ENABLED(CONFIG_IPV6))
3066                         return -EPFNOSUPPORT;
3067
3068                 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3069                 conf->remote_ip.sa.sa_family = AF_INET6;
3070         }
3071
3072         if (data[IFLA_VXLAN_LOCAL]) {
3073                 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3074                 conf->saddr.sa.sa_family = AF_INET;
3075         } else if (data[IFLA_VXLAN_LOCAL6]) {
3076                 if (!IS_ENABLED(CONFIG_IPV6))
3077                         return -EPFNOSUPPORT;
3078
3079                 /* TODO: respect scope id */
3080                 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3081                 conf->saddr.sa.sa_family = AF_INET6;
3082         }
3083
3084         if (data[IFLA_VXLAN_LINK])
3085                 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3086
3087         if (data[IFLA_VXLAN_TOS])
3088                 conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
3089
3090         if (data[IFLA_VXLAN_TTL])
3091                 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3092
3093         if (data[IFLA_VXLAN_LABEL])
3094                 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3095                              IPV6_FLOWLABEL_MASK;
3096
3097         if (data[IFLA_VXLAN_LEARNING]) {
3098                 if (nla_get_u8(data[IFLA_VXLAN_LEARNING])) {
3099                         conf->flags |= VXLAN_F_LEARN;
3100                 } else {
3101                         conf->flags &= ~VXLAN_F_LEARN;
3102                         vxlan->flags &= ~VXLAN_F_LEARN;
3103                 }
3104         } else if (!changelink) {
3105                 /* default to learn on a new device */
3106                 conf->flags |= VXLAN_F_LEARN;
3107         }
3108
3109         if (data[IFLA_VXLAN_AGEING]) {
3110                 if (changelink)
3111                         return -EOPNOTSUPP;
3112                 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3113         }
3114
3115         if (data[IFLA_VXLAN_PROXY]) {
3116                 if (changelink)
3117                         return -EOPNOTSUPP;
3118                 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3119                         conf->flags |= VXLAN_F_PROXY;
3120         }
3121
3122         if (data[IFLA_VXLAN_RSC]) {
3123                 if (changelink)
3124                         return -EOPNOTSUPP;
3125                 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3126                         conf->flags |= VXLAN_F_RSC;
3127         }
3128
3129         if (data[IFLA_VXLAN_L2MISS]) {
3130                 if (changelink)
3131                         return -EOPNOTSUPP;
3132                 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3133                         conf->flags |= VXLAN_F_L2MISS;
3134         }
3135
3136         if (data[IFLA_VXLAN_L3MISS]) {
3137                 if (changelink)
3138                         return -EOPNOTSUPP;
3139                 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3140                         conf->flags |= VXLAN_F_L3MISS;
3141         }
3142
3143         if (data[IFLA_VXLAN_LIMIT]) {
3144                 if (changelink)
3145                         return -EOPNOTSUPP;
3146                 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3147         }
3148
3149         if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3150                 if (changelink)
3151                         return -EOPNOTSUPP;
3152                 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3153                         conf->flags |= VXLAN_F_COLLECT_METADATA;
3154         }
3155
3156         if (data[IFLA_VXLAN_PORT_RANGE]) {
3157                 if (!changelink) {
3158                         const struct ifla_vxlan_port_range *p
3159                                 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3160                         conf->port_min = ntohs(p->low);
3161                         conf->port_max = ntohs(p->high);
3162                 } else {
3163                         return -EOPNOTSUPP;
3164                 }
3165         }
3166
3167         if (data[IFLA_VXLAN_PORT]) {
3168                 if (changelink)
3169                         return -EOPNOTSUPP;
3170                 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3171         }
3172
3173         if (data[IFLA_VXLAN_UDP_CSUM]) {
3174                 if (changelink)
3175                         return -EOPNOTSUPP;
3176                 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3177                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3178         }
3179
3180         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3181                 if (changelink)
3182                         return -EOPNOTSUPP;
3183                 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3184                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3185         }
3186
3187         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3188                 if (changelink)
3189                         return -EOPNOTSUPP;
3190                 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3191                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3192         }
3193
3194         if (data[IFLA_VXLAN_REMCSUM_TX]) {
3195                 if (changelink)
3196                         return -EOPNOTSUPP;
3197                 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3198                         conf->flags |= VXLAN_F_REMCSUM_TX;
3199         }
3200
3201         if (data[IFLA_VXLAN_REMCSUM_RX]) {
3202                 if (changelink)
3203                         return -EOPNOTSUPP;
3204                 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3205                         conf->flags |= VXLAN_F_REMCSUM_RX;
3206         }
3207
3208         if (data[IFLA_VXLAN_GBP]) {
3209                 if (changelink)
3210                         return -EOPNOTSUPP;
3211                 conf->flags |= VXLAN_F_GBP;
3212         }
3213
3214         if (data[IFLA_VXLAN_GPE]) {
3215                 if (changelink)
3216                         return -EOPNOTSUPP;
3217                 conf->flags |= VXLAN_F_GPE;
3218         }
3219
3220         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3221                 if (changelink)
3222                         return -EOPNOTSUPP;
3223                 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3224         }
3225
3226         if (tb[IFLA_MTU]) {
3227                 if (changelink)
3228                         return -EOPNOTSUPP;
3229                 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3230         }
3231
3232         return 0;
3233 }
3234
3235 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3236                          struct nlattr *tb[], struct nlattr *data[])
3237 {
3238         struct vxlan_config conf;
3239         int err;
3240
3241         err = vxlan_nl2conf(tb, data, dev, &conf, false);
3242         if (err)
3243                 return err;
3244
3245         return __vxlan_dev_create(src_net, dev, &conf);
3246 }
3247
3248 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3249                             struct nlattr *data[])
3250 {
3251         struct vxlan_dev *vxlan = netdev_priv(dev);
3252         struct vxlan_rdst *dst = &vxlan->default_dst;
3253         struct vxlan_rdst old_dst;
3254         struct vxlan_config conf;
3255         int err;
3256
3257         err = vxlan_nl2conf(tb, data,
3258                             dev, &conf, true);
3259         if (err)
3260                 return err;
3261
3262         memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3263
3264         err = vxlan_dev_configure(vxlan->net, dev, &conf, true);
3265         if (err)
3266                 return err;
3267
3268         /* handle default dst entry */
3269         if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3270                 spin_lock_bh(&vxlan->hash_lock);
3271                 if (!vxlan_addr_any(&old_dst.remote_ip))
3272                         __vxlan_fdb_delete(vxlan, all_zeros_mac,
3273                                            old_dst.remote_ip,
3274                                            vxlan->cfg.dst_port,
3275                                            old_dst.remote_vni,
3276                                            old_dst.remote_vni,
3277                                            old_dst.remote_ifindex, 0);
3278
3279                 if (!vxlan_addr_any(&dst->remote_ip)) {
3280                         err = vxlan_fdb_create(vxlan, all_zeros_mac,
3281                                                &dst->remote_ip,
3282                                                NUD_REACHABLE | NUD_PERMANENT,
3283                                                NLM_F_CREATE | NLM_F_APPEND,
3284                                                vxlan->cfg.dst_port,
3285                                                dst->remote_vni,
3286                                                dst->remote_vni,
3287                                                dst->remote_ifindex,
3288                                                NTF_SELF);
3289                         if (err) {
3290                                 spin_unlock_bh(&vxlan->hash_lock);
3291                                 return err;
3292                         }
3293                 }
3294                 spin_unlock_bh(&vxlan->hash_lock);
3295         }
3296
3297         return 0;
3298 }
3299
3300 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3301 {
3302         struct vxlan_dev *vxlan = netdev_priv(dev);
3303         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3304
3305         vxlan_flush(vxlan, true);
3306
3307         spin_lock(&vn->sock_lock);
3308         if (!hlist_unhashed(&vxlan->hlist))
3309                 hlist_del_rcu(&vxlan->hlist);
3310         spin_unlock(&vn->sock_lock);
3311
3312         gro_cells_destroy(&vxlan->gro_cells);
3313         list_del(&vxlan->next);
3314         unregister_netdevice_queue(dev, head);
3315 }
3316
3317 static size_t vxlan_get_size(const struct net_device *dev)
3318 {
3319
3320         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
3321                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3322                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3323                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3324                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3325                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3326                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3327                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3328                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3329                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3330                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3331                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3332                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3333                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3334                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3335                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3336                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3337                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3338                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3339                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3340                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3341                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3342                 0;
3343 }
3344
3345 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3346 {
3347         const struct vxlan_dev *vxlan = netdev_priv(dev);
3348         const struct vxlan_rdst *dst = &vxlan->default_dst;
3349         struct ifla_vxlan_port_range ports = {
3350                 .low =  htons(vxlan->cfg.port_min),
3351                 .high = htons(vxlan->cfg.port_max),
3352         };
3353
3354         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3355                 goto nla_put_failure;
3356
3357         if (!vxlan_addr_any(&dst->remote_ip)) {
3358                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3359                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3360                                             dst->remote_ip.sin.sin_addr.s_addr))
3361                                 goto nla_put_failure;
3362 #if IS_ENABLED(CONFIG_IPV6)
3363                 } else {
3364                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3365                                              &dst->remote_ip.sin6.sin6_addr))
3366                                 goto nla_put_failure;
3367 #endif
3368                 }
3369         }
3370
3371         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3372                 goto nla_put_failure;
3373
3374         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3375                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3376                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3377                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3378                                 goto nla_put_failure;
3379 #if IS_ENABLED(CONFIG_IPV6)
3380                 } else {
3381                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3382                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3383                                 goto nla_put_failure;
3384 #endif
3385                 }
3386         }
3387
3388         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3389             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3390             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3391             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3392                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
3393             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3394                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
3395             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3396             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3397                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3398             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3399                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3400             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3401                        !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3402             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3403             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3404             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3405             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3406                         !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3407             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3408                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3409             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3410                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3411             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3412                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3413             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3414                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3415                 goto nla_put_failure;
3416
3417         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3418                 goto nla_put_failure;
3419
3420         if (vxlan->flags & VXLAN_F_GBP &&
3421             nla_put_flag(skb, IFLA_VXLAN_GBP))
3422                 goto nla_put_failure;
3423
3424         if (vxlan->flags & VXLAN_F_GPE &&
3425             nla_put_flag(skb, IFLA_VXLAN_GPE))
3426                 goto nla_put_failure;
3427
3428         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3429             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3430                 goto nla_put_failure;
3431
3432         return 0;
3433
3434 nla_put_failure:
3435         return -EMSGSIZE;
3436 }
3437
3438 static struct net *vxlan_get_link_net(const struct net_device *dev)
3439 {
3440         struct vxlan_dev *vxlan = netdev_priv(dev);
3441
3442         return vxlan->net;
3443 }
3444
3445 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3446         .kind           = "vxlan",
3447         .maxtype        = IFLA_VXLAN_MAX,
3448         .policy         = vxlan_policy,
3449         .priv_size      = sizeof(struct vxlan_dev),
3450         .setup          = vxlan_setup,
3451         .validate       = vxlan_validate,
3452         .newlink        = vxlan_newlink,
3453         .changelink     = vxlan_changelink,
3454         .dellink        = vxlan_dellink,
3455         .get_size       = vxlan_get_size,
3456         .fill_info      = vxlan_fill_info,
3457         .get_link_net   = vxlan_get_link_net,
3458 };
3459
3460 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3461                                     u8 name_assign_type,
3462                                     struct vxlan_config *conf)
3463 {
3464         struct nlattr *tb[IFLA_MAX + 1];
3465         struct net_device *dev;
3466         int err;
3467
3468         memset(&tb, 0, sizeof(tb));
3469
3470         dev = rtnl_create_link(net, name, name_assign_type,
3471                                &vxlan_link_ops, tb);
3472         if (IS_ERR(dev))
3473                 return dev;
3474
3475         err = __vxlan_dev_create(net, dev, conf);
3476         if (err < 0) {
3477                 free_netdev(dev);
3478                 return ERR_PTR(err);
3479         }
3480
3481         err = rtnl_configure_link(dev, NULL);
3482         if (err < 0) {
3483                 LIST_HEAD(list_kill);
3484
3485                 vxlan_dellink(dev, &list_kill);
3486                 unregister_netdevice_many(&list_kill);
3487                 return ERR_PTR(err);
3488         }
3489
3490         return dev;
3491 }
3492 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3493
3494 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3495                                              struct net_device *dev)
3496 {
3497         struct vxlan_dev *vxlan, *next;
3498         LIST_HEAD(list_kill);
3499
3500         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3501                 struct vxlan_rdst *dst = &vxlan->default_dst;
3502
3503                 /* In case we created vxlan device with carrier
3504                  * and we loose the carrier due to module unload
3505                  * we also need to remove vxlan device. In other
3506                  * cases, it's not necessary and remote_ifindex
3507                  * is 0 here, so no matches.
3508                  */
3509                 if (dst->remote_ifindex == dev->ifindex)
3510                         vxlan_dellink(vxlan->dev, &list_kill);
3511         }
3512
3513         unregister_netdevice_many(&list_kill);
3514 }
3515
3516 static int vxlan_netdevice_event(struct notifier_block *unused,
3517                                  unsigned long event, void *ptr)
3518 {
3519         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3520         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3521
3522         if (event == NETDEV_UNREGISTER)
3523                 vxlan_handle_lowerdev_unregister(vn, dev);
3524         else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
3525                 vxlan_push_rx_ports(dev);
3526
3527         return NOTIFY_DONE;
3528 }
3529
3530 static struct notifier_block vxlan_notifier_block __read_mostly = {
3531         .notifier_call = vxlan_netdevice_event,
3532 };
3533
3534 static __net_init int vxlan_init_net(struct net *net)
3535 {
3536         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3537         unsigned int h;
3538
3539         INIT_LIST_HEAD(&vn->vxlan_list);
3540         spin_lock_init(&vn->sock_lock);
3541
3542         for (h = 0; h < PORT_HASH_SIZE; ++h)
3543                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3544
3545         return 0;
3546 }
3547
3548 static void __net_exit vxlan_exit_net(struct net *net)
3549 {
3550         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3551         struct vxlan_dev *vxlan, *next;
3552         struct net_device *dev, *aux;
3553         LIST_HEAD(list);
3554
3555         rtnl_lock();
3556         for_each_netdev_safe(net, dev, aux)
3557                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3558                         unregister_netdevice_queue(dev, &list);
3559
3560         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3561                 /* If vxlan->dev is in the same netns, it has already been added
3562                  * to the list by the previous loop.
3563                  */
3564                 if (!net_eq(dev_net(vxlan->dev), net)) {
3565                         gro_cells_destroy(&vxlan->gro_cells);
3566                         unregister_netdevice_queue(vxlan->dev, &list);
3567                 }
3568         }
3569
3570         unregister_netdevice_many(&list);
3571         rtnl_unlock();
3572 }
3573
3574 static struct pernet_operations vxlan_net_ops = {
3575         .init = vxlan_init_net,
3576         .exit = vxlan_exit_net,
3577         .id   = &vxlan_net_id,
3578         .size = sizeof(struct vxlan_net),
3579 };
3580
3581 static int __init vxlan_init_module(void)
3582 {
3583         int rc;
3584
3585         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3586
3587         rc = register_pernet_subsys(&vxlan_net_ops);
3588         if (rc)
3589                 goto out1;
3590
3591         rc = register_netdevice_notifier(&vxlan_notifier_block);
3592         if (rc)
3593                 goto out2;
3594
3595         rc = rtnl_link_register(&vxlan_link_ops);
3596         if (rc)
3597                 goto out3;
3598
3599         return 0;
3600 out3:
3601         unregister_netdevice_notifier(&vxlan_notifier_block);
3602 out2:
3603         unregister_pernet_subsys(&vxlan_net_ops);
3604 out1:
3605         return rc;
3606 }
3607 late_initcall(vxlan_init_module);
3608
3609 static void __exit vxlan_cleanup_module(void)
3610 {
3611         rtnl_link_unregister(&vxlan_link_ops);
3612         unregister_netdevice_notifier(&vxlan_notifier_block);
3613         unregister_pernet_subsys(&vxlan_net_ops);
3614         /* rcu_barrier() is called by netns */
3615 }
3616 module_exit(vxlan_cleanup_module);
3617
3618 MODULE_LICENSE("GPL");
3619 MODULE_VERSION(VXLAN_VERSION);
3620 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3621 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3622 MODULE_ALIAS_RTNL_LINK("vxlan");