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/types.h>
  15 #include <linux/module.h>
  16 #include <linux/errno.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/rculist.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/in.h>
  22 #include <linux/ip.h>
  23 #include <linux/udp.h>
  24 #include <linux/igmp.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/if_vlan.h>
  28 #include <linux/hash.h>
  29 #include <linux/ethtool.h>
  30 #include <net/arp.h>
  31 #include <net/ndisc.h>
  32 #include <net/ip.h>
  33 #include <net/ip_tunnels.h>
  34 #include <net/icmp.h>
  35 #include <net/udp.h>
  36 #include <net/udp_tunnel.h>
  37 #include <net/rtnetlink.h>
  38 #include <net/route.h>
  39 #include <net/dsfield.h>
  40 #include <net/inet_ecn.h>
  41 #include <net/net_namespace.h>
  42 #include <net/netns/generic.h>
  43 #include <net/vxlan.h>
  44 #include <net/protocol.h>
  45 #include <net/udp_tunnel.h>
  46 #if IS_ENABLED(CONFIG_IPV6)
  47 #include <net/ipv6.h>
  48 #include <net/addrconf.h>
  49 #include <net/ip6_tunnel.h>
  50 #include <net/ip6_checksum.h>
  51 #endif
  52
  53 #define VXLAN_VERSION   "0.1"
  54
  55 #define PORT_HASH_BITS  8
  56 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  57 #define VNI_HASH_BITS   10
  58 #define VNI_HASH_SIZE   (1<<VNI_HASH_BITS)
  59 #define FDB_HASH_BITS   8
  60 #define FDB_HASH_SIZE   (1<<FDB_HASH_BITS)
  61 #define FDB_AGE_DEFAULT 300 /* 5 min */
  62 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  63
  64 /* UDP port for VXLAN traffic.
  65  * The IANA assigned port is 4789, but the Linux default is 8472
  66  * for compatibility with early adopters.
  67  */
  68 static unsigned short vxlan_port __read_mostly = 8472;
  69 module_param_named(udp_port, vxlan_port, ushort, 0444);
  70 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  71
  72 static bool log_ecn_error = true;
  73 module_param(log_ecn_error, bool, 0644);
  74 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  75
  76 static int vxlan_net_id;
  77
  78 static const u8 all_zeros_mac[ETH_ALEN];
  79
  80 /* per-network namespace private data for this module */
  81 struct vxlan_net {
  82         struct list_head  vxlan_list;
  83         struct hlist_head sock_list[PORT_HASH_SIZE];
  84         spinlock_t        sock_lock;
  85 };
  86
  87 union vxlan_addr {
  88         struct sockaddr_in sin;
  89         struct sockaddr_in6 sin6;
  90         struct sockaddr sa;
  91 };
  92
  93 struct vxlan_rdst {
  94         union vxlan_addr         remote_ip;
  95         __be16                   remote_port;
  96         u32                      remote_vni;
  97         u32                      remote_ifindex;
  98         struct list_head         list;
  99         struct rcu_head          rcu;
 100 };
 101
 102 /* Forwarding table entry */
 103 struct vxlan_fdb {
 104         struct hlist_node hlist;        /* linked list of entries */
 105         struct rcu_head   rcu;
 106         unsigned long     updated;      /* jiffies */
 107         unsigned long     used;
 108         struct list_head  remotes;
 109         u16               state;        /* see ndm_state */
 110         u8                flags;        /* see ndm_flags */
 111         u8                eth_addr[ETH_ALEN];
 112 };
 113
 114 /* Pseudo network device */
 115 struct vxlan_dev {
 116         struct hlist_node hlist;        /* vni hash table */
 117         struct list_head  next;         /* vxlan's per namespace list */
 118         struct vxlan_sock *vn_sock;     /* listening socket */
 119         struct net_device *dev;
 120         struct net        *net;         /* netns for packet i/o */
 121         struct vxlan_rdst default_dst;  /* default destination */
 122         union vxlan_addr  saddr;        /* source address */
 123         __be16            dst_port;
 124         __u16             port_min;     /* source port range */
 125         __u16             port_max;
 126         __u8              tos;          /* TOS override */
 127         __u8              ttl;
 128         u32               flags;        /* VXLAN_F_* in vxlan.h */
 129
 130         struct work_struct sock_work;
 131         struct work_struct igmp_join;
 132         struct work_struct igmp_leave;
 133
 134         unsigned long     age_interval;
 135         struct timer_list age_timer;
 136         spinlock_t        hash_lock;
 137         unsigned int      addrcnt;
 138         unsigned int      addrmax;
 139
 140         struct hlist_head fdb_head[FDB_HASH_SIZE];
 141 };
 142
 143 /* salt for hash table */
 144 static u32 vxlan_salt __read_mostly;
 145 static struct workqueue_struct *vxlan_wq;
 146
 147 static void vxlan_sock_work(struct work_struct *work);
 148
 149 #if IS_ENABLED(CONFIG_IPV6)
 150 static inline
 151 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 152 {
 153        if (a->sa.sa_family != b->sa.sa_family)
 154                return false;
 155        if (a->sa.sa_family == AF_INET6)
 156                return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 157        else
 158                return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 159 }
 160
 161 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 162 {
 163        if (ipa->sa.sa_family == AF_INET6)
 164                return ipv6_addr_any(&ipa->sin6.sin6_addr);
 165        else
 166                return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 167 }
 168
 169 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 170 {
 171        if (ipa->sa.sa_family == AF_INET6)
 172                return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 173        else
 174                return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 175 }
 176
 177 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 178 {
 179        if (nla_len(nla) >= sizeof(struct in6_addr)) {
 180                nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
 181                ip->sa.sa_family = AF_INET6;
 182                return 0;
 183        } else if (nla_len(nla) >= sizeof(__be32)) {
 184                ip->sin.sin_addr.s_addr = nla_get_be32(nla);
 185                ip->sa.sa_family = AF_INET;
 186                return 0;
 187        } else {
 188                return -EAFNOSUPPORT;
 189        }
 190 }
 191
 192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 193                              const union vxlan_addr *ip)
 194 {
 195        if (ip->sa.sa_family == AF_INET6)
 196                return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
 197        else
 198                return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
 199 }
 200
 201 #else /* !CONFIG_IPV6 */
 202
 203 static inline
 204 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 205 {
 206        return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 207 }
 208
 209 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 210 {
 211        return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 212 }
 213
 214 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 215 {
 216        return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 217 }
 218
 219 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 220 {
 221        if (nla_len(nla) >= sizeof(struct in6_addr)) {
 222                return -EAFNOSUPPORT;
 223        } else if (nla_len(nla) >= sizeof(__be32)) {
 224                ip->sin.sin_addr.s_addr = nla_get_be32(nla);
 225                ip->sa.sa_family = AF_INET;
 226                return 0;
 227        } else {
 228                return -EAFNOSUPPORT;
 229        }
 230 }
 231
 232 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 233                              const union vxlan_addr *ip)
 234 {
 235        return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
 236 }
 237 #endif
 238
 239 /* Virtual Network hash table head */
 240 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
 241 {
 242         return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
 243 }
 244
 245 /* Socket hash table head */
 246 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 247 {
 248         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 249
 250         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 251 }
 252
 253 /* First remote destination for a forwarding entry.
 254  * Guaranteed to be non-NULL because remotes are never deleted.
 255  */
 256 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 257 {
 258         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 259 }
 260
 261 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 262 {
 263         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 264 }
 265
 266 /* Find VXLAN socket based on network namespace, address family and UDP port
 267  * and enabled unshareable flags.
 268  */
 269 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 270                                           __be16 port, u32 flags)
 271 {
 272         struct vxlan_sock *vs;
 273
 274         flags &= VXLAN_F_RCV_FLAGS;
 275
 276         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 277                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 278                     inet_sk(vs->sock->sk)->sk.sk_family == family &&
 279                     vs->flags == flags)
 280                         return vs;
 281         }
 282         return NULL;
 283 }
 284
 285 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
 286 {
 287         struct vxlan_dev *vxlan;
 288
 289         hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
 290                 if (vxlan->default_dst.remote_vni == id)
 291                         return vxlan;
 292         }
 293
 294         return NULL;
 295 }
 296
 297 /* Look up VNI in a per net namespace table */
 298 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
 299                                         sa_family_t family, __be16 port,
 300                                         u32 flags)
 301 {
 302         struct vxlan_sock *vs;
 303
 304         vs = vxlan_find_sock(net, family, port, flags);
 305         if (!vs)
 306                 return NULL;
 307
 308         return vxlan_vs_find_vni(vs, id);
 309 }
 310
 311 /* Fill in neighbour message in skbuff. */
 312 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 313                           const struct vxlan_fdb *fdb,
 314                           u32 portid, u32 seq, int type, unsigned int flags,
 315                           const struct vxlan_rdst *rdst)
 316 {
 317         unsigned long now = jiffies;
 318         struct nda_cacheinfo ci;
 319         struct nlmsghdr *nlh;
 320         struct ndmsg *ndm;
 321         bool send_ip, send_eth;
 322
 323         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 324         if (nlh == NULL)
 325                 return -EMSGSIZE;
 326
 327         ndm = nlmsg_data(nlh);
 328         memset(ndm, 0, sizeof(*ndm));
 329
 330         send_eth = send_ip = true;
 331
 332         if (type == RTM_GETNEIGH) {
 333                 ndm->ndm_family = AF_INET;
 334                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 335                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 336         } else
 337                 ndm->ndm_family = AF_BRIDGE;
 338         ndm->ndm_state = fdb->state;
 339         ndm->ndm_ifindex = vxlan->dev->ifindex;
 340         ndm->ndm_flags = fdb->flags;
 341         ndm->ndm_type = RTN_UNICAST;
 342
 343         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 344             nla_put_s32(skb, NDA_LINK_NETNSID,
 345                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 346                 goto nla_put_failure;
 347
 348         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 349                 goto nla_put_failure;
 350
 351         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 352                 goto nla_put_failure;
 353
 354         if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
 355             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 356                 goto nla_put_failure;
 357         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 358             nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
 359                 goto nla_put_failure;
 360         if (rdst->remote_ifindex &&
 361             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 362                 goto nla_put_failure;
 363
 364         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 365         ci.ndm_confirmed = 0;
 366         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 367         ci.ndm_refcnt    = 0;
 368
 369         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 370                 goto nla_put_failure;
 371
 372         nlmsg_end(skb, nlh);
 373         return 0;
 374
 375 nla_put_failure:
 376         nlmsg_cancel(skb, nlh);
 377         return -EMSGSIZE;
 378 }
 379
 380 static inline size_t vxlan_nlmsg_size(void)
 381 {
 382         return NLMSG_ALIGN(sizeof(struct ndmsg))
 383                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 384                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 385                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 386                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 387                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 388                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 389                 + nla_total_size(sizeof(struct nda_cacheinfo));
 390 }
 391
 392 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 393                              struct vxlan_rdst *rd, int type)
 394 {
 395         struct net *net = dev_net(vxlan->dev);
 396         struct sk_buff *skb;
 397         int err = -ENOBUFS;
 398
 399         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 400         if (skb == NULL)
 401                 goto errout;
 402
 403         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 404         if (err < 0) {
 405                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 406                 WARN_ON(err == -EMSGSIZE);
 407                 kfree_skb(skb);
 408                 goto errout;
 409         }
 410
 411         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 412         return;
 413 errout:
 414         if (err < 0)
 415                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 416 }
 417
 418 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 419 {
 420         struct vxlan_dev *vxlan = netdev_priv(dev);
 421         struct vxlan_fdb f = {
 422                 .state = NUD_STALE,
 423         };
 424         struct vxlan_rdst remote = {
 425                 .remote_ip = *ipa, /* goes to NDA_DST */
 426                 .remote_vni = VXLAN_N_VID,
 427         };
 428
 429         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 430 }
 431
 432 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 433 {
 434         struct vxlan_fdb f = {
 435                 .state = NUD_STALE,
 436         };
 437         struct vxlan_rdst remote = { };
 438
 439         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 440
 441         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 442 }
 443
 444 /* Hash Ethernet address */
 445 static u32 eth_hash(const unsigned char *addr)
 446 {
 447         u64 value = get_unaligned((u64 *)addr);
 448
 449         /* only want 6 bytes */
 450 #ifdef __BIG_ENDIAN
 451         value >>= 16;
 452 #else
 453         value <<= 16;
 454 #endif
 455         return hash_64(value, FDB_HASH_BITS);
 456 }
 457
 458 /* Hash chain to use given mac address */
 459 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 460                                                 const u8 *mac)
 461 {
 462         return &vxlan->fdb_head[eth_hash(mac)];
 463 }
 464
 465 /* Look up Ethernet address in forwarding table */
 466 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 467                                         const u8 *mac)
 468 {
 469         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 470         struct vxlan_fdb *f;
 471
 472         hlist_for_each_entry_rcu(f, head, hlist) {
 473                 if (ether_addr_equal(mac, f->eth_addr))
 474                         return f;
 475         }
 476
 477         return NULL;
 478 }
 479
 480 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 481                                         const u8 *mac)
 482 {
 483         struct vxlan_fdb *f;
 484
 485         f = __vxlan_find_mac(vxlan, mac);
 486         if (f)
 487                 f->used = jiffies;
 488
 489         return f;
 490 }
 491
 492 /* caller should hold vxlan->hash_lock */
 493 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 494                                               union vxlan_addr *ip, __be16 port,
 495                                               __u32 vni, __u32 ifindex)
 496 {
 497         struct vxlan_rdst *rd;
 498
 499         list_for_each_entry(rd, &f->remotes, list) {
 500                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 501                     rd->remote_port == port &&
 502                     rd->remote_vni == vni &&
 503                     rd->remote_ifindex == ifindex)
 504                         return rd;
 505         }
 506
 507         return NULL;
 508 }
 509
 510 /* Replace destination of unicast mac */
 511 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 512                              union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
 513 {
 514         struct vxlan_rdst *rd;
 515
 516         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 517         if (rd)
 518                 return 0;
 519
 520         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 521         if (!rd)
 522                 return 0;
 523         rd->remote_ip = *ip;
 524         rd->remote_port = port;
 525         rd->remote_vni = vni;
 526         rd->remote_ifindex = ifindex;
 527         return 1;
 528 }
 529
 530 /* Add/update destinations for multicast */
 531 static int vxlan_fdb_append(struct vxlan_fdb *f,
 532                             union vxlan_addr *ip, __be16 port, __u32 vni,
 533                             __u32 ifindex, struct vxlan_rdst **rdp)
 534 {
 535         struct vxlan_rdst *rd;
 536
 537         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 538         if (rd)
 539                 return 0;
 540
 541         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 542         if (rd == NULL)
 543                 return -ENOBUFS;
 544         rd->remote_ip = *ip;
 545         rd->remote_port = port;
 546         rd->remote_vni = vni;
 547         rd->remote_ifindex = ifindex;
 548
 549         list_add_tail_rcu(&rd->list, &f->remotes);
 550
 551         *rdp = rd;
 552         return 1;
 553 }
 554
 555 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 556                                           unsigned int off,
 557                                           struct vxlanhdr *vh, size_t hdrlen,
 558                                           u32 data, struct gro_remcsum *grc,
 559                                           bool nopartial)
 560 {
 561         size_t start, offset, plen;
 562
 563         if (skb->remcsum_offload)
 564                 return NULL;
 565
 566         if (!NAPI_GRO_CB(skb)->csum_valid)
 567                 return NULL;
 568
 569         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
 570         offset = start + ((data & VXLAN_RCO_UDP) ?
 571                           offsetof(struct udphdr, check) :
 572                           offsetof(struct tcphdr, check));
 573
 574         plen = hdrlen + offset + sizeof(u16);
 575
 576         /* Pull checksum that will be written */
 577         if (skb_gro_header_hard(skb, off + plen)) {
 578                 vh = skb_gro_header_slow(skb, off + plen, off);
 579                 if (!vh)
 580                         return NULL;
 581         }
 582
 583         skb_gro_remcsum_process(skb, (void *)vh + hdrlen,
 584                                 start, offset, grc, nopartial);
 585
 586         skb->remcsum_offload = 1;
 587
 588         return vh;
 589 }
 590
 591 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
 592                                           struct sk_buff *skb,
 593                                           struct udp_offload *uoff)
 594 {
 595         struct sk_buff *p, **pp = NULL;
 596         struct vxlanhdr *vh, *vh2;
 597         unsigned int hlen, off_vx;
 598         int flush = 1;
 599         struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
 600                                              udp_offloads);
 601         u32 flags;
 602         struct gro_remcsum grc;
 603
 604         skb_gro_remcsum_init(&grc);
 605
 606         off_vx = skb_gro_offset(skb);
 607         hlen = off_vx + sizeof(*vh);
 608         vh   = skb_gro_header_fast(skb, off_vx);
 609         if (skb_gro_header_hard(skb, hlen)) {
 610                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 611                 if (unlikely(!vh))
 612                         goto out;
 613         }
 614
 615         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 616         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 617
 618         flags = ntohl(vh->vx_flags);
 619
 620         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 621                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 622                                        ntohl(vh->vx_vni), &grc,
 623                                        !!(vs->flags &
 624                                           VXLAN_F_REMCSUM_NOPARTIAL));
 625
 626                 if (!vh)
 627                         goto out;
 628         }
 629
 630         flush = 0;
 631
 632         for (p = *head; p; p = p->next) {
 633                 if (!NAPI_GRO_CB(p)->same_flow)
 634                         continue;
 635
 636                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 637                 if (vh->vx_flags != vh2->vx_flags ||
 638                     vh->vx_vni != vh2->vx_vni) {
 639                         NAPI_GRO_CB(p)->same_flow = 0;
 640                         continue;
 641                 }
 642         }
 643
 644         pp = eth_gro_receive(head, skb);
 645
 646 out:
 647         skb_gro_remcsum_cleanup(skb, &grc);
 648         NAPI_GRO_CB(skb)->flush |= flush;
 649
 650         return pp;
 651 }
 652
 653 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
 654                               struct udp_offload *uoff)
 655 {
 656         udp_tunnel_gro_complete(skb, nhoff);
 657
 658         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 659 }
 660
 661 /* Notify netdevs that UDP port started listening */
 662 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
 663 {
 664         struct net_device *dev;
 665         struct sock *sk = vs->sock->sk;
 666         struct net *net = sock_net(sk);
 667         sa_family_t sa_family = sk->sk_family;
 668         __be16 port = inet_sk(sk)->inet_sport;
 669         int err;
 670
 671         if (sa_family == AF_INET) {
 672                 err = udp_add_offload(&vs->udp_offloads);
 673                 if (err)
 674                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
 675         }
 676
 677         rcu_read_lock();
 678         for_each_netdev_rcu(net, dev) {
 679                 if (dev->netdev_ops->ndo_add_vxlan_port)
 680                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
 681                                                             port);
 682         }
 683         rcu_read_unlock();
 684 }
 685
 686 /* Notify netdevs that UDP port is no more listening */
 687 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
 688 {
 689         struct net_device *dev;
 690         struct sock *sk = vs->sock->sk;
 691         struct net *net = sock_net(sk);
 692         sa_family_t sa_family = sk->sk_family;
 693         __be16 port = inet_sk(sk)->inet_sport;
 694
 695         rcu_read_lock();
 696         for_each_netdev_rcu(net, dev) {
 697                 if (dev->netdev_ops->ndo_del_vxlan_port)
 698                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
 699                                                             port);
 700         }
 701         rcu_read_unlock();
 702
 703         if (sa_family == AF_INET)
 704                 udp_del_offload(&vs->udp_offloads);
 705 }
 706
 707 /* Add new entry to forwarding table -- assumes lock held */
 708 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 709                             const u8 *mac, union vxlan_addr *ip,
 710                             __u16 state, __u16 flags,
 711                             __be16 port, __u32 vni, __u32 ifindex,
 712                             __u8 ndm_flags)
 713 {
 714         struct vxlan_rdst *rd = NULL;
 715         struct vxlan_fdb *f;
 716         int notify = 0;
 717
 718         f = __vxlan_find_mac(vxlan, mac);
 719         if (f) {
 720                 if (flags & NLM_F_EXCL) {
 721                         netdev_dbg(vxlan->dev,
 722                                    "lost race to create %pM\n", mac);
 723                         return -EEXIST;
 724                 }
 725                 if (f->state != state) {
 726                         f->state = state;
 727                         f->updated = jiffies;
 728                         notify = 1;
 729                 }
 730                 if (f->flags != ndm_flags) {
 731                         f->flags = ndm_flags;
 732                         f->updated = jiffies;
 733                         notify = 1;
 734                 }
 735                 if ((flags & NLM_F_REPLACE)) {
 736                         /* Only change unicasts */
 737                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 738                              is_zero_ether_addr(f->eth_addr))) {
 739                                 int rc = vxlan_fdb_replace(f, ip, port, vni,
 740                                                            ifindex);
 741
 742                                 if (rc < 0)
 743                                         return rc;
 744                                 notify |= rc;
 745                         } else
 746                                 return -EOPNOTSUPP;
 747                 }
 748                 if ((flags & NLM_F_APPEND) &&
 749                     (is_multicast_ether_addr(f->eth_addr) ||
 750                      is_zero_ether_addr(f->eth_addr))) {
 751                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
 752                                                   &rd);
 753
 754                         if (rc < 0)
 755                                 return rc;
 756                         notify |= rc;
 757                 }
 758         } else {
 759                 if (!(flags & NLM_F_CREATE))
 760                         return -ENOENT;
 761
 762                 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
 763                         return -ENOSPC;
 764
 765                 /* Disallow replace to add a multicast entry */
 766                 if ((flags & NLM_F_REPLACE) &&
 767                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 768                         return -EOPNOTSUPP;
 769
 770                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 771                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 772                 if (!f)
 773                         return -ENOMEM;
 774
 775                 notify = 1;
 776                 f->state = state;
 777                 f->flags = ndm_flags;
 778                 f->updated = f->used = jiffies;
 779                 INIT_LIST_HEAD(&f->remotes);
 780                 memcpy(f->eth_addr, mac, ETH_ALEN);
 781
 782                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 783
 784                 ++vxlan->addrcnt;
 785                 hlist_add_head_rcu(&f->hlist,
 786                                    vxlan_fdb_head(vxlan, mac));
 787         }
 788
 789         if (notify) {
 790                 if (rd == NULL)
 791                         rd = first_remote_rtnl(f);
 792                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 793         }
 794
 795         return 0;
 796 }
 797
 798 static void vxlan_fdb_free(struct rcu_head *head)
 799 {
 800         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 801         struct vxlan_rdst *rd, *nd;
 802
 803         list_for_each_entry_safe(rd, nd, &f->remotes, list)
 804                 kfree(rd);
 805         kfree(f);
 806 }
 807
 808 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 809 {
 810         netdev_dbg(vxlan->dev,
 811                     "delete %pM\n", f->eth_addr);
 812
 813         --vxlan->addrcnt;
 814         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 815
 816         hlist_del_rcu(&f->hlist);
 817         call_rcu(&f->rcu, vxlan_fdb_free);
 818 }
 819
 820 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 821                            union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
 822 {
 823         struct net *net = dev_net(vxlan->dev);
 824         int err;
 825
 826         if (tb[NDA_DST]) {
 827                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 828                 if (err)
 829                         return err;
 830         } else {
 831                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 832                 if (remote->sa.sa_family == AF_INET) {
 833                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 834                         ip->sa.sa_family = AF_INET;
 835 #if IS_ENABLED(CONFIG_IPV6)
 836                 } else {
 837                         ip->sin6.sin6_addr = in6addr_any;
 838                         ip->sa.sa_family = AF_INET6;
 839 #endif
 840                 }
 841         }
 842
 843         if (tb[NDA_PORT]) {
 844                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 845                         return -EINVAL;
 846                 *port = nla_get_be16(tb[NDA_PORT]);
 847         } else {
 848                 *port = vxlan->dst_port;
 849         }
 850
 851         if (tb[NDA_VNI]) {
 852                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 853                         return -EINVAL;
 854                 *vni = nla_get_u32(tb[NDA_VNI]);
 855         } else {
 856                 *vni = vxlan->default_dst.remote_vni;
 857         }
 858
 859         if (tb[NDA_IFINDEX]) {
 860                 struct net_device *tdev;
 861
 862                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 863                         return -EINVAL;
 864                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 865                 tdev = __dev_get_by_index(net, *ifindex);
 866                 if (!tdev)
 867                         return -EADDRNOTAVAIL;
 868         } else {
 869                 *ifindex = 0;
 870         }
 871
 872         return 0;
 873 }
 874
 875 /* Add static entry (via netlink) */
 876 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 877                          struct net_device *dev,
 878                          const unsigned char *addr, u16 vid, u16 flags)
 879 {
 880         struct vxlan_dev *vxlan = netdev_priv(dev);
 881         /* struct net *net = dev_net(vxlan->dev); */
 882         union vxlan_addr ip;
 883         __be16 port;
 884         u32 vni, ifindex;
 885         int err;
 886
 887         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 888                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 889                         ndm->ndm_state);
 890                 return -EINVAL;
 891         }
 892
 893         if (tb[NDA_DST] == NULL)
 894                 return -EINVAL;
 895
 896         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 897         if (err)
 898                 return err;
 899
 900         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 901                 return -EAFNOSUPPORT;
 902
 903         spin_lock_bh(&vxlan->hash_lock);
 904         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 905                                port, vni, ifindex, ndm->ndm_flags);
 906         spin_unlock_bh(&vxlan->hash_lock);
 907
 908         return err;
 909 }
 910
 911 /* Delete entry (via netlink) */
 912 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 913                             struct net_device *dev,
 914                             const unsigned char *addr, u16 vid)
 915 {
 916         struct vxlan_dev *vxlan = netdev_priv(dev);
 917         struct vxlan_fdb *f;
 918         struct vxlan_rdst *rd = NULL;
 919         union vxlan_addr ip;
 920         __be16 port;
 921         u32 vni, ifindex;
 922         int err;
 923
 924         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 925         if (err)
 926                 return err;
 927
 928         err = -ENOENT;
 929
 930         spin_lock_bh(&vxlan->hash_lock);
 931         f = vxlan_find_mac(vxlan, addr);
 932         if (!f)
 933                 goto out;
 934
 935         if (!vxlan_addr_any(&ip)) {
 936                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 937                 if (!rd)
 938                         goto out;
 939         }
 940
 941         err = 0;
 942
 943         /* remove a destination if it's not the only one on the list,
 944          * otherwise destroy the fdb entry
 945          */
 946         if (rd && !list_is_singular(&f->remotes)) {
 947                 list_del_rcu(&rd->list);
 948                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 949                 kfree_rcu(rd, rcu);
 950                 goto out;
 951         }
 952
 953         vxlan_fdb_destroy(vxlan, f);
 954
 955 out:
 956         spin_unlock_bh(&vxlan->hash_lock);
 957
 958         return err;
 959 }
 960
 961 /* Dump forwarding table */
 962 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 963                           struct net_device *dev,
 964                           struct net_device *filter_dev, int idx)
 965 {
 966         struct vxlan_dev *vxlan = netdev_priv(dev);
 967         unsigned int h;
 968
 969         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 970                 struct vxlan_fdb *f;
 971                 int err;
 972
 973                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 974                         struct vxlan_rdst *rd;
 975
 976                         if (idx < cb->args[0])
 977                                 goto skip;
 978
 979                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 980                                 err = vxlan_fdb_info(skb, vxlan, f,
 981                                                      NETLINK_CB(cb->skb).portid,
 982                                                      cb->nlh->nlmsg_seq,
 983                                                      RTM_NEWNEIGH,
 984                                                      NLM_F_MULTI, rd);
 985                                 if (err < 0)
 986                                         goto out;
 987                         }
 988 skip:
 989                         ++idx;
 990                 }
 991         }
 992 out:
 993         return idx;
 994 }
 995
 996 /* Watch incoming packets to learn mapping between Ethernet address
 997  * and Tunnel endpoint.
 998  * Return true if packet is bogus and should be droppped.
 999  */
1000 static bool vxlan_snoop(struct net_device *dev,
1001                         union vxlan_addr *src_ip, const u8 *src_mac)
1002 {
1003         struct vxlan_dev *vxlan = netdev_priv(dev);
1004         struct vxlan_fdb *f;
1005
1006         f = vxlan_find_mac(vxlan, src_mac);
1007         if (likely(f)) {
1008                 struct vxlan_rdst *rdst = first_remote_rcu(f);
1009
1010                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
1011                         return false;
1012
1013                 /* Don't migrate static entries, drop packets */
1014                 if (f->state & NUD_NOARP)
1015                         return true;
1016
1017                 if (net_ratelimit())
1018                         netdev_info(dev,
1019                                     "%pM migrated from %pIS to %pIS\n",
1020                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1021
1022                 rdst->remote_ip = *src_ip;
1023                 f->updated = jiffies;
1024                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1025         } else {
1026                 /* learned new entry */
1027                 spin_lock(&vxlan->hash_lock);
1028
1029                 /* close off race between vxlan_flush and incoming packets */
1030                 if (netif_running(dev))
1031                         vxlan_fdb_create(vxlan, src_mac, src_ip,
1032                                          NUD_REACHABLE,
1033                                          NLM_F_EXCL|NLM_F_CREATE,
1034                                          vxlan->dst_port,
1035                                          vxlan->default_dst.remote_vni,
1036                                          0, NTF_SELF);
1037                 spin_unlock(&vxlan->hash_lock);
1038         }
1039
1040         return false;
1041 }
1042
1043 /* See if multicast group is already in use by other ID */
1044 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1045 {
1046         struct vxlan_dev *vxlan;
1047
1048         /* The vxlan_sock is only used by dev, leaving group has
1049          * no effect on other vxlan devices.
1050          */
1051         if (atomic_read(&dev->vn_sock->refcnt) == 1)
1052                 return false;
1053
1054         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1055                 if (!netif_running(vxlan->dev) || vxlan == dev)
1056                         continue;
1057
1058                 if (vxlan->vn_sock != dev->vn_sock)
1059                         continue;
1060
1061                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1062                                       &dev->default_dst.remote_ip))
1063                         continue;
1064
1065                 if (vxlan->default_dst.remote_ifindex !=
1066                     dev->default_dst.remote_ifindex)
1067                         continue;
1068
1069                 return true;
1070         }
1071
1072         return false;
1073 }
1074
1075 static void vxlan_sock_hold(struct vxlan_sock *vs)
1076 {
1077         atomic_inc(&vs->refcnt);
1078 }
1079
1080 void vxlan_sock_release(struct vxlan_sock *vs)
1081 {
1082         struct sock *sk = vs->sock->sk;
1083         struct net *net = sock_net(sk);
1084         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1085
1086         if (!atomic_dec_and_test(&vs->refcnt))
1087                 return;
1088
1089         spin_lock(&vn->sock_lock);
1090         hlist_del_rcu(&vs->hlist);
1091         vxlan_notify_del_rx_port(vs);
1092         spin_unlock(&vn->sock_lock);
1093
1094         queue_work(vxlan_wq, &vs->del_work);
1095 }
1096 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1097
1098 /* Callback to update multicast group membership when first VNI on
1099  * multicast asddress is brought up
1100  * Done as workqueue because ip_mc_join_group acquires RTNL.
1101  */
1102 static void vxlan_igmp_join(struct work_struct *work)
1103 {
1104         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1105         struct vxlan_sock *vs = vxlan->vn_sock;
1106         struct sock *sk = vs->sock->sk;
1107         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1108         int ifindex = vxlan->default_dst.remote_ifindex;
1109
1110         lock_sock(sk);
1111         if (ip->sa.sa_family == AF_INET) {
1112                 struct ip_mreqn mreq = {
1113                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1114                         .imr_ifindex            = ifindex,
1115                 };
1116
1117                 ip_mc_join_group(sk, &mreq);
1118 #if IS_ENABLED(CONFIG_IPV6)
1119         } else {
1120                 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1121                                              &ip->sin6.sin6_addr);
1122 #endif
1123         }
1124         release_sock(sk);
1125
1126         vxlan_sock_release(vs);
1127         dev_put(vxlan->dev);
1128 }
1129
1130 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1131 static void vxlan_igmp_leave(struct work_struct *work)
1132 {
1133         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1134         struct vxlan_sock *vs = vxlan->vn_sock;
1135         struct sock *sk = vs->sock->sk;
1136         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1137         int ifindex = vxlan->default_dst.remote_ifindex;
1138
1139         lock_sock(sk);
1140         if (ip->sa.sa_family == AF_INET) {
1141                 struct ip_mreqn mreq = {
1142                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1143                         .imr_ifindex            = ifindex,
1144                 };
1145
1146                 ip_mc_leave_group(sk, &mreq);
1147 #if IS_ENABLED(CONFIG_IPV6)
1148         } else {
1149                 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1150                                              &ip->sin6.sin6_addr);
1151 #endif
1152         }
1153
1154         release_sock(sk);
1155
1156         vxlan_sock_release(vs);
1157         dev_put(vxlan->dev);
1158 }
1159
1160 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1161                                       size_t hdrlen, u32 data, bool nopartial)
1162 {
1163         size_t start, offset, plen;
1164
1165         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1166         offset = start + ((data & VXLAN_RCO_UDP) ?
1167                           offsetof(struct udphdr, check) :
1168                           offsetof(struct tcphdr, check));
1169
1170         plen = hdrlen + offset + sizeof(u16);
1171
1172         if (!pskb_may_pull(skb, plen))
1173                 return NULL;
1174
1175         vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1176
1177         skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1178                             nopartial);
1179
1180         return vh;
1181 }
1182
1183 /* Callback from net/ipv4/udp.c to receive packets */
1184 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1185 {
1186         struct vxlan_sock *vs;
1187         struct vxlanhdr *vxh;
1188         u32 flags, vni;
1189         struct vxlan_metadata md = {0};
1190
1191         /* Need Vxlan and inner Ethernet header to be present */
1192         if (!pskb_may_pull(skb, VXLAN_HLEN))
1193                 goto error;
1194
1195         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1196         flags = ntohl(vxh->vx_flags);
1197         vni = ntohl(vxh->vx_vni);
1198
1199         if (flags & VXLAN_HF_VNI) {
1200                 flags &= ~VXLAN_HF_VNI;
1201         } else {
1202                 /* VNI flag always required to be set */
1203                 goto bad_flags;
1204         }
1205
1206         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1207                 goto drop;
1208         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1209
1210         vs = rcu_dereference_sk_user_data(sk);
1211         if (!vs)
1212                 goto drop;
1213
1214         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1215                 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1216                                     !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1217                 if (!vxh)
1218                         goto drop;
1219
1220                 flags &= ~VXLAN_HF_RCO;
1221                 vni &= VXLAN_VNI_MASK;
1222         }
1223
1224         /* For backwards compatibility, only allow reserved fields to be
1225          * used by VXLAN extensions if explicitly requested.
1226          */
1227         if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1228                 struct vxlanhdr_gbp *gbp;
1229
1230                 gbp = (struct vxlanhdr_gbp *)vxh;
1231                 md.gbp = ntohs(gbp->policy_id);
1232
1233                 if (gbp->dont_learn)
1234                         md.gbp |= VXLAN_GBP_DONT_LEARN;
1235
1236                 if (gbp->policy_applied)
1237                         md.gbp |= VXLAN_GBP_POLICY_APPLIED;
1238
1239                 flags &= ~VXLAN_GBP_USED_BITS;
1240         }
1241
1242         if (flags || vni & ~VXLAN_VNI_MASK) {
1243                 /* If there are any unprocessed flags remaining treat
1244                  * this as a malformed packet. This behavior diverges from
1245                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1246                  * in reserved fields are to be ignored. The approach here
1247                  * maintains compatbility with previous stack code, and also
1248                  * is more robust and provides a little more security in
1249                  * adding extensions to VXLAN.
1250                  */
1251
1252                 goto bad_flags;
1253         }
1254
1255         md.vni = vxh->vx_vni;
1256         vs->rcv(vs, skb, &md);
1257         return 0;
1258
1259 drop:
1260         /* Consume bad packet */
1261         kfree_skb(skb);
1262         return 0;
1263
1264 bad_flags:
1265         netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1266                    ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1267
1268 error:
1269         /* Return non vxlan pkt */
1270         return 1;
1271 }
1272
1273 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1274                       struct vxlan_metadata *md)
1275 {
1276         struct iphdr *oip = NULL;
1277         struct ipv6hdr *oip6 = NULL;
1278         struct vxlan_dev *vxlan;
1279         struct pcpu_sw_netstats *stats;
1280         union vxlan_addr saddr;
1281         __u32 vni;
1282         int err = 0;
1283         union vxlan_addr *remote_ip;
1284
1285         vni = ntohl(md->vni) >> 8;
1286         /* Is this VNI defined? */
1287         vxlan = vxlan_vs_find_vni(vs, vni);
1288         if (!vxlan)
1289                 goto drop;
1290
1291         remote_ip = &vxlan->default_dst.remote_ip;
1292         skb_reset_mac_header(skb);
1293         skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1294         skb->protocol = eth_type_trans(skb, vxlan->dev);
1295         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1296
1297         /* Ignore packet loops (and multicast echo) */
1298         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1299                 goto drop;
1300
1301         /* Re-examine inner Ethernet packet */
1302         if (remote_ip->sa.sa_family == AF_INET) {
1303                 oip = ip_hdr(skb);
1304                 saddr.sin.sin_addr.s_addr = oip->saddr;
1305                 saddr.sa.sa_family = AF_INET;
1306 #if IS_ENABLED(CONFIG_IPV6)
1307         } else {
1308                 oip6 = ipv6_hdr(skb);
1309                 saddr.sin6.sin6_addr = oip6->saddr;
1310                 saddr.sa.sa_family = AF_INET6;
1311 #endif
1312         }
1313
1314         if ((vxlan->flags & VXLAN_F_LEARN) &&
1315             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1316                 goto drop;
1317
1318         skb_reset_network_header(skb);
1319         skb->mark = md->gbp;
1320
1321         if (oip6)
1322                 err = IP6_ECN_decapsulate(oip6, skb);
1323         if (oip)
1324                 err = IP_ECN_decapsulate(oip, skb);
1325
1326         if (unlikely(err)) {
1327                 if (log_ecn_error) {
1328                         if (oip6)
1329                                 net_info_ratelimited("non-ECT from %pI6\n",
1330                                                      &oip6->saddr);
1331                         if (oip)
1332                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1333                                                      &oip->saddr, oip->tos);
1334                 }
1335                 if (err > 1) {
1336                         ++vxlan->dev->stats.rx_frame_errors;
1337                         ++vxlan->dev->stats.rx_errors;
1338                         goto drop;
1339                 }
1340         }
1341
1342         stats = this_cpu_ptr(vxlan->dev->tstats);
1343         u64_stats_update_begin(&stats->syncp);
1344         stats->rx_packets++;
1345         stats->rx_bytes += skb->len;
1346         u64_stats_update_end(&stats->syncp);
1347
1348         netif_rx(skb);
1349
1350         return;
1351 drop:
1352         /* Consume bad packet */
1353         kfree_skb(skb);
1354 }
1355
1356 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1357 {
1358         struct vxlan_dev *vxlan = netdev_priv(dev);
1359         struct arphdr *parp;
1360         u8 *arpptr, *sha;
1361         __be32 sip, tip;
1362         struct neighbour *n;
1363
1364         if (dev->flags & IFF_NOARP)
1365                 goto out;
1366
1367         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1368                 dev->stats.tx_dropped++;
1369                 goto out;
1370         }
1371         parp = arp_hdr(skb);
1372
1373         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1374              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1375             parp->ar_pro != htons(ETH_P_IP) ||
1376             parp->ar_op != htons(ARPOP_REQUEST) ||
1377             parp->ar_hln != dev->addr_len ||
1378             parp->ar_pln != 4)
1379                 goto out;
1380         arpptr = (u8 *)parp + sizeof(struct arphdr);
1381         sha = arpptr;
1382         arpptr += dev->addr_len;        /* sha */
1383         memcpy(&sip, arpptr, sizeof(sip));
1384         arpptr += sizeof(sip);
1385         arpptr += dev->addr_len;        /* tha */
1386         memcpy(&tip, arpptr, sizeof(tip));
1387
1388         if (ipv4_is_loopback(tip) ||
1389             ipv4_is_multicast(tip))
1390                 goto out;
1391
1392         n = neigh_lookup(&arp_tbl, &tip, dev);
1393
1394         if (n) {
1395                 struct vxlan_fdb *f;
1396                 struct sk_buff  *reply;
1397
1398                 if (!(n->nud_state & NUD_CONNECTED)) {
1399                         neigh_release(n);
1400                         goto out;
1401                 }
1402
1403                 f = vxlan_find_mac(vxlan, n->ha);
1404                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1405                         /* bridge-local neighbor */
1406                         neigh_release(n);
1407                         goto out;
1408                 }
1409
1410                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1411                                 n->ha, sha);
1412
1413                 neigh_release(n);
1414
1415                 if (reply == NULL)
1416                         goto out;
1417
1418                 skb_reset_mac_header(reply);
1419                 __skb_pull(reply, skb_network_offset(reply));
1420                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1421                 reply->pkt_type = PACKET_HOST;
1422
1423                 if (netif_rx_ni(reply) == NET_RX_DROP)
1424                         dev->stats.rx_dropped++;
1425         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1426                 union vxlan_addr ipa = {
1427                         .sin.sin_addr.s_addr = tip,
1428                         .sin.sin_family = AF_INET,
1429                 };
1430
1431                 vxlan_ip_miss(dev, &ipa);
1432         }
1433 out:
1434         consume_skb(skb);
1435         return NETDEV_TX_OK;
1436 }
1437
1438 #if IS_ENABLED(CONFIG_IPV6)
1439 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1440         struct neighbour *n, bool isrouter)
1441 {
1442         struct net_device *dev = request->dev;
1443         struct sk_buff *reply;
1444         struct nd_msg *ns, *na;
1445         struct ipv6hdr *pip6;
1446         u8 *daddr;
1447         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1448         int ns_olen;
1449         int i, len;
1450
1451         if (dev == NULL)
1452                 return NULL;
1453
1454         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1455                 sizeof(*na) + na_olen + dev->needed_tailroom;
1456         reply = alloc_skb(len, GFP_ATOMIC);
1457         if (reply == NULL)
1458                 return NULL;
1459
1460         reply->protocol = htons(ETH_P_IPV6);
1461         reply->dev = dev;
1462         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1463         skb_push(reply, sizeof(struct ethhdr));
1464         skb_set_mac_header(reply, 0);
1465
1466         ns = (struct nd_msg *)skb_transport_header(request);
1467
1468         daddr = eth_hdr(request)->h_source;
1469         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1470         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1471                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1472                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1473                         break;
1474                 }
1475         }
1476
1477         /* Ethernet header */
1478         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1479         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1480         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1481         reply->protocol = htons(ETH_P_IPV6);
1482
1483         skb_pull(reply, sizeof(struct ethhdr));
1484         skb_set_network_header(reply, 0);
1485         skb_put(reply, sizeof(struct ipv6hdr));
1486
1487         /* IPv6 header */
1488
1489         pip6 = ipv6_hdr(reply);
1490         memset(pip6, 0, sizeof(struct ipv6hdr));
1491         pip6->version = 6;
1492         pip6->priority = ipv6_hdr(request)->priority;
1493         pip6->nexthdr = IPPROTO_ICMPV6;
1494         pip6->hop_limit = 255;
1495         pip6->daddr = ipv6_hdr(request)->saddr;
1496         pip6->saddr = *(struct in6_addr *)n->primary_key;
1497
1498         skb_pull(reply, sizeof(struct ipv6hdr));
1499         skb_set_transport_header(reply, 0);
1500
1501         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1502
1503         /* Neighbor Advertisement */
1504         memset(na, 0, sizeof(*na)+na_olen);
1505         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1506         na->icmph.icmp6_router = isrouter;
1507         na->icmph.icmp6_override = 1;
1508         na->icmph.icmp6_solicited = 1;
1509         na->target = ns->target;
1510         ether_addr_copy(&na->opt[2], n->ha);
1511         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1512         na->opt[1] = na_olen >> 3;
1513
1514         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1515                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1516                 csum_partial(na, sizeof(*na)+na_olen, 0));
1517
1518         pip6->payload_len = htons(sizeof(*na)+na_olen);
1519
1520         skb_push(reply, sizeof(struct ipv6hdr));
1521
1522         reply->ip_summed = CHECKSUM_UNNECESSARY;
1523
1524         return reply;
1525 }
1526
1527 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1528 {
1529         struct vxlan_dev *vxlan = netdev_priv(dev);
1530         struct nd_msg *msg;
1531         const struct ipv6hdr *iphdr;
1532         const struct in6_addr *saddr, *daddr;
1533         struct neighbour *n;
1534         struct inet6_dev *in6_dev;
1535
1536         in6_dev = __in6_dev_get(dev);
1537         if (!in6_dev)
1538                 goto out;
1539
1540         iphdr = ipv6_hdr(skb);
1541         saddr = &iphdr->saddr;
1542         daddr = &iphdr->daddr;
1543
1544         msg = (struct nd_msg *)skb_transport_header(skb);
1545         if (msg->icmph.icmp6_code != 0 ||
1546             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1547                 goto out;
1548
1549         if (ipv6_addr_loopback(daddr) ||
1550             ipv6_addr_is_multicast(&msg->target))
1551                 goto out;
1552
1553         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1554
1555         if (n) {
1556                 struct vxlan_fdb *f;
1557                 struct sk_buff *reply;
1558
1559                 if (!(n->nud_state & NUD_CONNECTED)) {
1560                         neigh_release(n);
1561                         goto out;
1562                 }
1563
1564                 f = vxlan_find_mac(vxlan, n->ha);
1565                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1566                         /* bridge-local neighbor */
1567                         neigh_release(n);
1568                         goto out;
1569                 }
1570
1571                 reply = vxlan_na_create(skb, n,
1572                                         !!(f ? f->flags & NTF_ROUTER : 0));
1573
1574                 neigh_release(n);
1575
1576                 if (reply == NULL)
1577                         goto out;
1578
1579                 if (netif_rx_ni(reply) == NET_RX_DROP)
1580                         dev->stats.rx_dropped++;
1581
1582         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1583                 union vxlan_addr ipa = {
1584                         .sin6.sin6_addr = msg->target,
1585                         .sin6.sin6_family = AF_INET6,
1586                 };
1587
1588                 vxlan_ip_miss(dev, &ipa);
1589         }
1590
1591 out:
1592         consume_skb(skb);
1593         return NETDEV_TX_OK;
1594 }
1595 #endif
1596
1597 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1598 {
1599         struct vxlan_dev *vxlan = netdev_priv(dev);
1600         struct neighbour *n;
1601
1602         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1603                 return false;
1604
1605         n = NULL;
1606         switch (ntohs(eth_hdr(skb)->h_proto)) {
1607         case ETH_P_IP:
1608         {
1609                 struct iphdr *pip;
1610
1611                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1612                         return false;
1613                 pip = ip_hdr(skb);
1614                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1615                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1616                         union vxlan_addr ipa = {
1617                                 .sin.sin_addr.s_addr = pip->daddr,
1618                                 .sin.sin_family = AF_INET,
1619                         };
1620
1621                         vxlan_ip_miss(dev, &ipa);
1622                         return false;
1623                 }
1624
1625                 break;
1626         }
1627 #if IS_ENABLED(CONFIG_IPV6)
1628         case ETH_P_IPV6:
1629         {
1630                 struct ipv6hdr *pip6;
1631
1632                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1633                         return false;
1634                 pip6 = ipv6_hdr(skb);
1635                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1636                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1637                         union vxlan_addr ipa = {
1638                                 .sin6.sin6_addr = pip6->daddr,
1639                                 .sin6.sin6_family = AF_INET6,
1640                         };
1641
1642                         vxlan_ip_miss(dev, &ipa);
1643                         return false;
1644                 }
1645
1646                 break;
1647         }
1648 #endif
1649         default:
1650                 return false;
1651         }
1652
1653         if (n) {
1654                 bool diff;
1655
1656                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1657                 if (diff) {
1658                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1659                                 dev->addr_len);
1660                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1661                 }
1662                 neigh_release(n);
1663                 return diff;
1664         }
1665
1666         return false;
1667 }
1668
1669 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1670                                 struct vxlan_metadata *md)
1671 {
1672         struct vxlanhdr_gbp *gbp;
1673
1674         if (!md->gbp)
1675                 return;
1676
1677         gbp = (struct vxlanhdr_gbp *)vxh;
1678         vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1679
1680         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1681                 gbp->dont_learn = 1;
1682
1683         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1684                 gbp->policy_applied = 1;
1685
1686         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1687 }
1688
1689 #if IS_ENABLED(CONFIG_IPV6)
1690 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sk_buff *skb,
1691                            struct net_device *dev, struct in6_addr *saddr,
1692                            struct in6_addr *daddr, __u8 prio, __u8 ttl,
1693                            __be16 src_port, __be16 dst_port,
1694                            struct vxlan_metadata *md, bool xnet, u32 vxflags)
1695 {
1696         struct vxlanhdr *vxh;
1697         int min_headroom;
1698         int err;
1699         bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1700         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1701         u16 hdrlen = sizeof(struct vxlanhdr);
1702
1703         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1704             skb->ip_summed == CHECKSUM_PARTIAL) {
1705                 int csum_start = skb_checksum_start_offset(skb);
1706
1707                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1708                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1709                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1710                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1711                         udp_sum = false;
1712                         type |= SKB_GSO_TUNNEL_REMCSUM;
1713                 }
1714         }
1715
1716         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1717         if (IS_ERR(skb)) {
1718                 err = -EINVAL;
1719                 goto err;
1720         }
1721
1722         skb_scrub_packet(skb, xnet);
1723
1724         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1725                         + VXLAN_HLEN + sizeof(struct ipv6hdr)
1726                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1727
1728         /* Need space for new headers (invalidates iph ptr) */
1729         err = skb_cow_head(skb, min_headroom);
1730         if (unlikely(err)) {
1731                 kfree_skb(skb);
1732                 goto err;
1733         }
1734
1735         skb = vlan_hwaccel_push_inside(skb);
1736         if (WARN_ON(!skb)) {
1737                 err = -ENOMEM;
1738                 goto err;
1739         }
1740
1741         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1742         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1743         vxh->vx_vni = md->vni;
1744
1745         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1746                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1747                            VXLAN_RCO_SHIFT;
1748
1749                 if (skb->csum_offset == offsetof(struct udphdr, check))
1750                         data |= VXLAN_RCO_UDP;
1751
1752                 vxh->vx_vni |= htonl(data);
1753                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1754
1755                 if (!skb_is_gso(skb)) {
1756                         skb->ip_summed = CHECKSUM_NONE;
1757                         skb->encapsulation = 0;
1758                 }
1759         }
1760
1761         if (vxflags & VXLAN_F_GBP)
1762                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1763
1764         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1765
1766         udp_tunnel6_xmit_skb(dst, skb, dev, saddr, daddr, prio,
1767                              ttl, src_port, dst_port,
1768                              !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1769         return 0;
1770 err:
1771         dst_release(dst);
1772         return err;
1773 }
1774 #endif
1775
1776 int vxlan_xmit_skb(struct rtable *rt, struct sk_buff *skb,
1777                    __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1778                    __be16 src_port, __be16 dst_port,
1779                    struct vxlan_metadata *md, bool xnet, u32 vxflags)
1780 {
1781         struct vxlanhdr *vxh;
1782         int min_headroom;
1783         int err;
1784         bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1785         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1786         u16 hdrlen = sizeof(struct vxlanhdr);
1787
1788         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1789             skb->ip_summed == CHECKSUM_PARTIAL) {
1790                 int csum_start = skb_checksum_start_offset(skb);
1791
1792                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1793                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1794                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1795                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1796                         udp_sum = false;
1797                         type |= SKB_GSO_TUNNEL_REMCSUM;
1798                 }
1799         }
1800
1801         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1802         if (IS_ERR(skb))
1803                 return PTR_ERR(skb);
1804
1805         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1806                         + VXLAN_HLEN + sizeof(struct iphdr)
1807                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1808
1809         /* Need space for new headers (invalidates iph ptr) */
1810         err = skb_cow_head(skb, min_headroom);
1811         if (unlikely(err)) {
1812                 kfree_skb(skb);
1813                 return err;
1814         }
1815
1816         skb = vlan_hwaccel_push_inside(skb);
1817         if (WARN_ON(!skb))
1818                 return -ENOMEM;
1819
1820         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1821         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1822         vxh->vx_vni = md->vni;
1823
1824         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1825                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1826                            VXLAN_RCO_SHIFT;
1827
1828                 if (skb->csum_offset == offsetof(struct udphdr, check))
1829                         data |= VXLAN_RCO_UDP;
1830
1831                 vxh->vx_vni |= htonl(data);
1832                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1833
1834                 if (!skb_is_gso(skb)) {
1835                         skb->ip_summed = CHECKSUM_NONE;
1836                         skb->encapsulation = 0;
1837                 }
1838         }
1839
1840         if (vxflags & VXLAN_F_GBP)
1841                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1842
1843         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1844
1845         return udp_tunnel_xmit_skb(rt, skb, src, dst, tos,
1846                                    ttl, df, src_port, dst_port, xnet,
1847                                    !(vxflags & VXLAN_F_UDP_CSUM));
1848 }
1849 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1850
1851 /* Bypass encapsulation if the destination is local */
1852 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1853                                struct vxlan_dev *dst_vxlan)
1854 {
1855         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1856         union vxlan_addr loopback;
1857         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1858         struct net_device *dev = skb->dev;
1859         int len = skb->len;
1860
1861         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1862         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1863         skb->pkt_type = PACKET_HOST;
1864         skb->encapsulation = 0;
1865         skb->dev = dst_vxlan->dev;
1866         __skb_pull(skb, skb_network_offset(skb));
1867
1868         if (remote_ip->sa.sa_family == AF_INET) {
1869                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1870                 loopback.sa.sa_family =  AF_INET;
1871 #if IS_ENABLED(CONFIG_IPV6)
1872         } else {
1873                 loopback.sin6.sin6_addr = in6addr_loopback;
1874                 loopback.sa.sa_family =  AF_INET6;
1875 #endif
1876         }
1877
1878         if (dst_vxlan->flags & VXLAN_F_LEARN)
1879                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1880
1881         u64_stats_update_begin(&tx_stats->syncp);
1882         tx_stats->tx_packets++;
1883         tx_stats->tx_bytes += len;
1884         u64_stats_update_end(&tx_stats->syncp);
1885
1886         if (netif_rx(skb) == NET_RX_SUCCESS) {
1887                 u64_stats_update_begin(&rx_stats->syncp);
1888                 rx_stats->rx_packets++;
1889                 rx_stats->rx_bytes += len;
1890                 u64_stats_update_end(&rx_stats->syncp);
1891         } else {
1892                 dev->stats.rx_dropped++;
1893         }
1894 }
1895
1896 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1897                            struct vxlan_rdst *rdst, bool did_rsc)
1898 {
1899         struct vxlan_dev *vxlan = netdev_priv(dev);
1900         struct rtable *rt = NULL;
1901         const struct iphdr *old_iph;
1902         struct flowi4 fl4;
1903         union vxlan_addr *dst;
1904         struct vxlan_metadata md;
1905         __be16 src_port = 0, dst_port;
1906         u32 vni;
1907         __be16 df = 0;
1908         __u8 tos, ttl;
1909         int err;
1910
1911         dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1912         vni = rdst->remote_vni;
1913         dst = &rdst->remote_ip;
1914
1915         if (vxlan_addr_any(dst)) {
1916                 if (did_rsc) {
1917                         /* short-circuited back to local bridge */
1918                         vxlan_encap_bypass(skb, vxlan, vxlan);
1919                         return;
1920                 }
1921                 goto drop;
1922         }
1923
1924         old_iph = ip_hdr(skb);
1925
1926         ttl = vxlan->ttl;
1927         if (!ttl && vxlan_addr_multicast(dst))
1928                 ttl = 1;
1929
1930         tos = vxlan->tos;
1931         if (tos == 1)
1932                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1933
1934         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1935                                      vxlan->port_max, true);
1936
1937         if (dst->sa.sa_family == AF_INET) {
1938                 memset(&fl4, 0, sizeof(fl4));
1939                 fl4.flowi4_oif = rdst->remote_ifindex;
1940                 fl4.flowi4_tos = RT_TOS(tos);
1941                 fl4.daddr = dst->sin.sin_addr.s_addr;
1942                 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1943
1944                 rt = ip_route_output_key(vxlan->net, &fl4);
1945                 if (IS_ERR(rt)) {
1946                         netdev_dbg(dev, "no route to %pI4\n",
1947                                    &dst->sin.sin_addr.s_addr);
1948                         dev->stats.tx_carrier_errors++;
1949                         goto tx_error;
1950                 }
1951
1952                 if (rt->dst.dev == dev) {
1953                         netdev_dbg(dev, "circular route to %pI4\n",
1954                                    &dst->sin.sin_addr.s_addr);
1955                         dev->stats.collisions++;
1956                         goto rt_tx_error;
1957                 }
1958
1959                 /* Bypass encapsulation if the destination is local */
1960                 if (rt->rt_flags & RTCF_LOCAL &&
1961                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1962                         struct vxlan_dev *dst_vxlan;
1963
1964                         ip_rt_put(rt);
1965                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1966                                                    dst->sa.sa_family, dst_port,
1967                                                    vxlan->flags);
1968                         if (!dst_vxlan)
1969                                 goto tx_error;
1970                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1971                         return;
1972                 }
1973
1974                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1975                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1976                 md.vni = htonl(vni << 8);
1977                 md.gbp = skb->mark;
1978
1979                 err = vxlan_xmit_skb(rt, skb, fl4.saddr,
1980                                      dst->sin.sin_addr.s_addr, tos, ttl, df,
1981                                      src_port, dst_port, &md,
1982                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
1983                                      vxlan->flags);
1984                 if (err < 0) {
1985                         /* skb is already freed. */
1986                         skb = NULL;
1987                         goto rt_tx_error;
1988                 }
1989
1990                 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1991 #if IS_ENABLED(CONFIG_IPV6)
1992         } else {
1993                 struct sock *sk = vxlan->vn_sock->sock->sk;
1994                 struct dst_entry *ndst;
1995                 struct flowi6 fl6;
1996                 u32 flags;
1997
1998                 memset(&fl6, 0, sizeof(fl6));
1999                 fl6.flowi6_oif = rdst->remote_ifindex;
2000                 fl6.daddr = dst->sin6.sin6_addr;
2001                 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
2002                 fl6.flowi6_proto = IPPROTO_UDP;
2003
2004                 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
2005                         netdev_dbg(dev, "no route to %pI6\n",
2006                                    &dst->sin6.sin6_addr);
2007                         dev->stats.tx_carrier_errors++;
2008                         goto tx_error;
2009                 }
2010
2011                 if (ndst->dev == dev) {
2012                         netdev_dbg(dev, "circular route to %pI6\n",
2013                                    &dst->sin6.sin6_addr);
2014                         dst_release(ndst);
2015                         dev->stats.collisions++;
2016                         goto tx_error;
2017                 }
2018
2019                 /* Bypass encapsulation if the destination is local */
2020                 flags = ((struct rt6_info *)ndst)->rt6i_flags;
2021                 if (flags & RTF_LOCAL &&
2022                     !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2023                         struct vxlan_dev *dst_vxlan;
2024
2025                         dst_release(ndst);
2026                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2027                                                    dst->sa.sa_family, dst_port,
2028                                                    vxlan->flags);
2029                         if (!dst_vxlan)
2030                                 goto tx_error;
2031                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2032                         return;
2033                 }
2034
2035                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2036                 md.vni = htonl(vni << 8);
2037                 md.gbp = skb->mark;
2038
2039                 err = vxlan6_xmit_skb(ndst, skb, dev, &fl6.saddr, &fl6.daddr,
2040                                       0, ttl, src_port, dst_port, &md,
2041                                       !net_eq(vxlan->net, dev_net(vxlan->dev)),
2042                                       vxlan->flags);
2043 #endif
2044         }
2045
2046         return;
2047
2048 drop:
2049         dev->stats.tx_dropped++;
2050         goto tx_free;
2051
2052 rt_tx_error:
2053         ip_rt_put(rt);
2054 tx_error:
2055         dev->stats.tx_errors++;
2056 tx_free:
2057         dev_kfree_skb(skb);
2058 }
2059
2060 /* Transmit local packets over Vxlan
2061  *
2062  * Outer IP header inherits ECN and DF from inner header.
2063  * Outer UDP destination is the VXLAN assigned port.
2064  *           source port is based on hash of flow
2065  */
2066 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2067 {
2068         struct vxlan_dev *vxlan = netdev_priv(dev);
2069         struct ethhdr *eth;
2070         bool did_rsc = false;
2071         struct vxlan_rdst *rdst, *fdst = NULL;
2072         struct vxlan_fdb *f;
2073
2074         skb_reset_mac_header(skb);
2075         eth = eth_hdr(skb);
2076
2077         if ((vxlan->flags & VXLAN_F_PROXY)) {
2078                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2079                         return arp_reduce(dev, skb);
2080 #if IS_ENABLED(CONFIG_IPV6)
2081                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2082                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2083                                        + sizeof(struct nd_msg)) &&
2084                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2085                                 struct nd_msg *msg;
2086
2087                                 msg = (struct nd_msg *)skb_transport_header(skb);
2088                                 if (msg->icmph.icmp6_code == 0 &&
2089                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2090                                         return neigh_reduce(dev, skb);
2091                 }
2092                 eth = eth_hdr(skb);
2093 #endif
2094         }
2095
2096         f = vxlan_find_mac(vxlan, eth->h_dest);
2097         did_rsc = false;
2098
2099         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2100             (ntohs(eth->h_proto) == ETH_P_IP ||
2101              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2102                 did_rsc = route_shortcircuit(dev, skb);
2103                 if (did_rsc)
2104                         f = vxlan_find_mac(vxlan, eth->h_dest);
2105         }
2106
2107         if (f == NULL) {
2108                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2109                 if (f == NULL) {
2110                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2111                             !is_multicast_ether_addr(eth->h_dest))
2112                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2113
2114                         dev->stats.tx_dropped++;
2115                         kfree_skb(skb);
2116                         return NETDEV_TX_OK;
2117                 }
2118         }
2119
2120         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2121                 struct sk_buff *skb1;
2122
2123                 if (!fdst) {
2124                         fdst = rdst;
2125                         continue;
2126                 }
2127                 skb1 = skb_clone(skb, GFP_ATOMIC);
2128                 if (skb1)
2129                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2130         }
2131
2132         if (fdst)
2133                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2134         else
2135                 kfree_skb(skb);
2136         return NETDEV_TX_OK;
2137 }
2138
2139 /* Walk the forwarding table and purge stale entries */
2140 static void vxlan_cleanup(unsigned long arg)
2141 {
2142         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2143         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2144         unsigned int h;
2145
2146         if (!netif_running(vxlan->dev))
2147                 return;
2148
2149         spin_lock_bh(&vxlan->hash_lock);
2150         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2151                 struct hlist_node *p, *n;
2152                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2153                         struct vxlan_fdb *f
2154                                 = container_of(p, struct vxlan_fdb, hlist);
2155                         unsigned long timeout;
2156
2157                         if (f->state & NUD_PERMANENT)
2158                                 continue;
2159
2160                         timeout = f->used + vxlan->age_interval * HZ;
2161                         if (time_before_eq(timeout, jiffies)) {
2162                                 netdev_dbg(vxlan->dev,
2163                                            "garbage collect %pM\n",
2164                                            f->eth_addr);
2165                                 f->state = NUD_STALE;
2166                                 vxlan_fdb_destroy(vxlan, f);
2167                         } else if (time_before(timeout, next_timer))
2168                                 next_timer = timeout;
2169                 }
2170         }
2171         spin_unlock_bh(&vxlan->hash_lock);
2172
2173         mod_timer(&vxlan->age_timer, next_timer);
2174 }
2175
2176 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2177 {
2178         __u32 vni = vxlan->default_dst.remote_vni;
2179
2180         vxlan->vn_sock = vs;
2181         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2182 }
2183
2184 /* Setup stats when device is created */
2185 static int vxlan_init(struct net_device *dev)
2186 {
2187         struct vxlan_dev *vxlan = netdev_priv(dev);
2188         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2189         struct vxlan_sock *vs;
2190         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2191
2192         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2193         if (!dev->tstats)
2194                 return -ENOMEM;
2195
2196         spin_lock(&vn->sock_lock);
2197         vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2198                              vxlan->dst_port, vxlan->flags);
2199         if (vs && atomic_add_unless(&vs->refcnt, 1, 0)) {
2200                 /* If we have a socket with same port already, reuse it */
2201                 vxlan_vs_add_dev(vs, vxlan);
2202         } else {
2203                 /* otherwise make new socket outside of RTNL */
2204                 dev_hold(dev);
2205                 queue_work(vxlan_wq, &vxlan->sock_work);
2206         }
2207         spin_unlock(&vn->sock_lock);
2208
2209         return 0;
2210 }
2211
2212 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2213 {
2214         struct vxlan_fdb *f;
2215
2216         spin_lock_bh(&vxlan->hash_lock);
2217         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2218         if (f)
2219                 vxlan_fdb_destroy(vxlan, f);
2220         spin_unlock_bh(&vxlan->hash_lock);
2221 }
2222
2223 static void vxlan_uninit(struct net_device *dev)
2224 {
2225         struct vxlan_dev *vxlan = netdev_priv(dev);
2226         struct vxlan_sock *vs = vxlan->vn_sock;
2227
2228         vxlan_fdb_delete_default(vxlan);
2229
2230         if (vs)
2231                 vxlan_sock_release(vs);
2232         free_percpu(dev->tstats);
2233 }
2234
2235 /* Start ageing timer and join group when device is brought up */
2236 static int vxlan_open(struct net_device *dev)
2237 {
2238         struct vxlan_dev *vxlan = netdev_priv(dev);
2239         struct vxlan_sock *vs = vxlan->vn_sock;
2240
2241         /* socket hasn't been created */
2242         if (!vs)
2243                 return -ENOTCONN;
2244
2245         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2246                 vxlan_sock_hold(vs);
2247                 dev_hold(dev);
2248                 queue_work(vxlan_wq, &vxlan->igmp_join);
2249         }
2250
2251         if (vxlan->age_interval)
2252                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2253
2254         return 0;
2255 }
2256
2257 /* Purge the forwarding table */
2258 static void vxlan_flush(struct vxlan_dev *vxlan)
2259 {
2260         unsigned int h;
2261
2262         spin_lock_bh(&vxlan->hash_lock);
2263         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2264                 struct hlist_node *p, *n;
2265                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2266                         struct vxlan_fdb *f
2267                                 = container_of(p, struct vxlan_fdb, hlist);
2268                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2269                         if (!is_zero_ether_addr(f->eth_addr))
2270                                 vxlan_fdb_destroy(vxlan, f);
2271                 }
2272         }
2273         spin_unlock_bh(&vxlan->hash_lock);
2274 }
2275
2276 /* Cleanup timer and forwarding table on shutdown */
2277 static int vxlan_stop(struct net_device *dev)
2278 {
2279         struct vxlan_dev *vxlan = netdev_priv(dev);
2280         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2281         struct vxlan_sock *vs = vxlan->vn_sock;
2282
2283         if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2284             !vxlan_group_used(vn, vxlan)) {
2285                 vxlan_sock_hold(vs);
2286                 dev_hold(dev);
2287                 queue_work(vxlan_wq, &vxlan->igmp_leave);
2288         }
2289
2290         del_timer_sync(&vxlan->age_timer);
2291
2292         vxlan_flush(vxlan);
2293
2294         return 0;
2295 }
2296
2297 /* Stub, nothing needs to be done. */
2298 static void vxlan_set_multicast_list(struct net_device *dev)
2299 {
2300 }
2301
2302 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2303 {
2304         struct vxlan_dev *vxlan = netdev_priv(dev);
2305         struct vxlan_rdst *dst = &vxlan->default_dst;
2306         struct net_device *lowerdev;
2307         int max_mtu;
2308
2309         lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2310         if (lowerdev == NULL)
2311                 return eth_change_mtu(dev, new_mtu);
2312
2313         if (dst->remote_ip.sa.sa_family == AF_INET6)
2314                 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2315         else
2316                 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2317
2318         if (new_mtu < 68 || new_mtu > max_mtu)
2319                 return -EINVAL;
2320
2321         dev->mtu = new_mtu;
2322         return 0;
2323 }
2324
2325 static const struct net_device_ops vxlan_netdev_ops = {
2326         .ndo_init               = vxlan_init,
2327         .ndo_uninit             = vxlan_uninit,
2328         .ndo_open               = vxlan_open,
2329         .ndo_stop               = vxlan_stop,
2330         .ndo_start_xmit         = vxlan_xmit,
2331         .ndo_get_stats64        = ip_tunnel_get_stats64,
2332         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2333         .ndo_change_mtu         = vxlan_change_mtu,
2334         .ndo_validate_addr      = eth_validate_addr,
2335         .ndo_set_mac_address    = eth_mac_addr,
2336         .ndo_fdb_add            = vxlan_fdb_add,
2337         .ndo_fdb_del            = vxlan_fdb_delete,
2338         .ndo_fdb_dump           = vxlan_fdb_dump,
2339 };
2340
2341 /* Info for udev, that this is a virtual tunnel endpoint */
2342 static struct device_type vxlan_type = {
2343         .name = "vxlan",
2344 };
2345
2346 /* Calls the ndo_add_vxlan_port of the caller in order to
2347  * supply the listening VXLAN udp ports. Callers are expected
2348  * to implement the ndo_add_vxlan_port.
2349  */
2350 void vxlan_get_rx_port(struct net_device *dev)
2351 {
2352         struct vxlan_sock *vs;
2353         struct net *net = dev_net(dev);
2354         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2355         sa_family_t sa_family;
2356         __be16 port;
2357         unsigned int i;
2358
2359         spin_lock(&vn->sock_lock);
2360         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2361                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2362                         port = inet_sk(vs->sock->sk)->inet_sport;
2363                         sa_family = vs->sock->sk->sk_family;
2364                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2365                                                             port);
2366                 }
2367         }
2368         spin_unlock(&vn->sock_lock);
2369 }
2370 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2371
2372 /* Initialize the device structure. */
2373 static void vxlan_setup(struct net_device *dev)
2374 {
2375         struct vxlan_dev *vxlan = netdev_priv(dev);
2376         unsigned int h;
2377
2378         eth_hw_addr_random(dev);
2379         ether_setup(dev);
2380         if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2381                 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2382         else
2383                 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2384
2385         dev->netdev_ops = &vxlan_netdev_ops;
2386         dev->destructor = free_netdev;
2387         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2388
2389         dev->tx_queue_len = 0;
2390         dev->features   |= NETIF_F_LLTX;
2391         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2392         dev->features   |= NETIF_F_RXCSUM;
2393         dev->features   |= NETIF_F_GSO_SOFTWARE;
2394
2395         dev->vlan_features = dev->features;
2396         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2397         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2398         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2399         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2400         netif_keep_dst(dev);
2401         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2402
2403         INIT_LIST_HEAD(&vxlan->next);
2404         spin_lock_init(&vxlan->hash_lock);
2405         INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2406         INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2407         INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2408
2409         init_timer_deferrable(&vxlan->age_timer);
2410         vxlan->age_timer.function = vxlan_cleanup;
2411         vxlan->age_timer.data = (unsigned long) vxlan;
2412
2413         vxlan->dst_port = htons(vxlan_port);
2414
2415         vxlan->dev = dev;
2416
2417         for (h = 0; h < FDB_HASH_SIZE; ++h)
2418                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2419 }
2420
2421 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2422         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2423         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2424         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2425         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2426         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2427         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2428         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2429         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2430         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2431         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2432         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2433         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2434         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2435         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2436         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2437         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2438         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2439         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2440         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2441         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2442         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2443         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2444         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2445         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2446 };
2447
2448 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2449 {
2450         if (tb[IFLA_ADDRESS]) {
2451                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2452                         pr_debug("invalid link address (not ethernet)\n");
2453                         return -EINVAL;
2454                 }
2455
2456                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2457                         pr_debug("invalid all zero ethernet address\n");
2458                         return -EADDRNOTAVAIL;
2459                 }
2460         }
2461
2462         if (!data)
2463                 return -EINVAL;
2464
2465         if (data[IFLA_VXLAN_ID]) {
2466                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2467                 if (id >= VXLAN_VID_MASK)
2468                         return -ERANGE;
2469         }
2470
2471         if (data[IFLA_VXLAN_PORT_RANGE]) {
2472                 const struct ifla_vxlan_port_range *p
2473                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2474
2475                 if (ntohs(p->high) < ntohs(p->low)) {
2476                         pr_debug("port range %u .. %u not valid\n",
2477                                  ntohs(p->low), ntohs(p->high));
2478                         return -EINVAL;
2479                 }
2480         }
2481
2482         return 0;
2483 }
2484
2485 static void vxlan_get_drvinfo(struct net_device *netdev,
2486                               struct ethtool_drvinfo *drvinfo)
2487 {
2488         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2489         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2490 }
2491
2492 static const struct ethtool_ops vxlan_ethtool_ops = {
2493         .get_drvinfo    = vxlan_get_drvinfo,
2494         .get_link       = ethtool_op_get_link,
2495 };
2496
2497 static void vxlan_del_work(struct work_struct *work)
2498 {
2499         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2500         udp_tunnel_sock_release(vs->sock);
2501         kfree_rcu(vs, rcu);
2502 }
2503
2504 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2505                                         __be16 port, u32 flags)
2506 {
2507         struct socket *sock;
2508         struct udp_port_cfg udp_conf;
2509         int err;
2510
2511         memset(&udp_conf, 0, sizeof(udp_conf));
2512
2513         if (ipv6) {
2514                 udp_conf.family = AF_INET6;
2515                 udp_conf.use_udp6_rx_checksums =
2516                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2517         } else {
2518                 udp_conf.family = AF_INET;
2519                 udp_conf.local_ip.s_addr = INADDR_ANY;
2520         }
2521
2522         udp_conf.local_udp_port = port;
2523
2524         /* Open UDP socket */
2525         err = udp_sock_create(net, &udp_conf, &sock);
2526         if (err < 0)
2527                 return ERR_PTR(err);
2528
2529         return sock;
2530 }
2531
2532 /* Create new listen socket if needed */
2533 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2534                                               vxlan_rcv_t *rcv, void *data,
2535                                               u32 flags)
2536 {
2537         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2538         struct vxlan_sock *vs;
2539         struct socket *sock;
2540         unsigned int h;
2541         bool ipv6 = !!(flags & VXLAN_F_IPV6);
2542         struct udp_tunnel_sock_cfg tunnel_cfg;
2543
2544         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2545         if (!vs)
2546                 return ERR_PTR(-ENOMEM);
2547
2548         for (h = 0; h < VNI_HASH_SIZE; ++h)
2549                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2550
2551         INIT_WORK(&vs->del_work, vxlan_del_work);
2552
2553         sock = vxlan_create_sock(net, ipv6, port, flags);
2554         if (IS_ERR(sock)) {
2555                 kfree(vs);
2556                 return ERR_CAST(sock);
2557         }
2558
2559         vs->sock = sock;
2560         atomic_set(&vs->refcnt, 1);
2561         vs->rcv = rcv;
2562         vs->data = data;
2563         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2564
2565         /* Initialize the vxlan udp offloads structure */
2566         vs->udp_offloads.port = port;
2567         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2568         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2569
2570         spin_lock(&vn->sock_lock);
2571         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2572         vxlan_notify_add_rx_port(vs);
2573         spin_unlock(&vn->sock_lock);
2574
2575         /* Mark socket as an encapsulation socket. */
2576         tunnel_cfg.sk_user_data = vs;
2577         tunnel_cfg.encap_type = 1;
2578         tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2579         tunnel_cfg.encap_destroy = NULL;
2580
2581         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2582
2583         return vs;
2584 }
2585
2586 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2587                                   vxlan_rcv_t *rcv, void *data,
2588                                   bool no_share, u32 flags)
2589 {
2590         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2591         struct vxlan_sock *vs;
2592         bool ipv6 = flags & VXLAN_F_IPV6;
2593
2594         vs = vxlan_socket_create(net, port, rcv, data, flags);
2595         if (!IS_ERR(vs))
2596                 return vs;
2597
2598         if (no_share)   /* Return error if sharing is not allowed. */
2599                 return vs;
2600
2601         spin_lock(&vn->sock_lock);
2602         vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port, flags);
2603         if (vs && ((vs->rcv != rcv) ||
2604                    !atomic_add_unless(&vs->refcnt, 1, 0)))
2605                         vs = ERR_PTR(-EBUSY);
2606         spin_unlock(&vn->sock_lock);
2607
2608         if (!vs)
2609                 vs = ERR_PTR(-EINVAL);
2610
2611         return vs;
2612 }
2613 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2614
2615 /* Scheduled at device creation to bind to a socket */
2616 static void vxlan_sock_work(struct work_struct *work)
2617 {
2618         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2619         struct net *net = vxlan->net;
2620         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2621         __be16 port = vxlan->dst_port;
2622         struct vxlan_sock *nvs;
2623
2624         nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
2625         spin_lock(&vn->sock_lock);
2626         if (!IS_ERR(nvs))
2627                 vxlan_vs_add_dev(nvs, vxlan);
2628         spin_unlock(&vn->sock_lock);
2629
2630         dev_put(vxlan->dev);
2631 }
2632
2633 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2634                          struct nlattr *tb[], struct nlattr *data[])
2635 {
2636         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2637         struct vxlan_dev *vxlan = netdev_priv(dev);
2638         struct vxlan_rdst *dst = &vxlan->default_dst;
2639         __u32 vni;
2640         int err;
2641         bool use_ipv6 = false;
2642
2643         if (!data[IFLA_VXLAN_ID])
2644                 return -EINVAL;
2645
2646         vxlan->net = src_net;
2647
2648         vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2649         dst->remote_vni = vni;
2650
2651         /* Unless IPv6 is explicitly requested, assume IPv4 */
2652         dst->remote_ip.sa.sa_family = AF_INET;
2653         if (data[IFLA_VXLAN_GROUP]) {
2654                 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2655         } else if (data[IFLA_VXLAN_GROUP6]) {
2656                 if (!IS_ENABLED(CONFIG_IPV6))
2657                         return -EPFNOSUPPORT;
2658
2659                 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2660                            sizeof(struct in6_addr));
2661                 dst->remote_ip.sa.sa_family = AF_INET6;
2662                 use_ipv6 = true;
2663         }
2664
2665         if (data[IFLA_VXLAN_LOCAL]) {
2666                 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2667                 vxlan->saddr.sa.sa_family = AF_INET;
2668         } else if (data[IFLA_VXLAN_LOCAL6]) {
2669                 if (!IS_ENABLED(CONFIG_IPV6))
2670                         return -EPFNOSUPPORT;
2671
2672                 /* TODO: respect scope id */
2673                 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2674                            sizeof(struct in6_addr));
2675                 vxlan->saddr.sa.sa_family = AF_INET6;
2676                 use_ipv6 = true;
2677         }
2678
2679         if (data[IFLA_VXLAN_LINK] &&
2680             (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2681                 struct net_device *lowerdev
2682                          = __dev_get_by_index(src_net, dst->remote_ifindex);
2683
2684                 if (!lowerdev) {
2685                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2686                         return -ENODEV;
2687                 }
2688
2689 #if IS_ENABLED(CONFIG_IPV6)
2690                 if (use_ipv6) {
2691                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2692                         if (idev && idev->cnf.disable_ipv6) {
2693                                 pr_info("IPv6 is disabled via sysctl\n");
2694                                 return -EPERM;
2695                         }
2696                         vxlan->flags |= VXLAN_F_IPV6;
2697                 }
2698 #endif
2699
2700                 if (!tb[IFLA_MTU])
2701                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2702
2703                 dev->needed_headroom = lowerdev->hard_header_len +
2704                                        (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2705         } else if (use_ipv6)
2706                 vxlan->flags |= VXLAN_F_IPV6;
2707
2708         if (data[IFLA_VXLAN_TOS])
2709                 vxlan->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2710
2711         if (data[IFLA_VXLAN_TTL])
2712                 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2713
2714         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2715                 vxlan->flags |= VXLAN_F_LEARN;
2716
2717         if (data[IFLA_VXLAN_AGEING])
2718                 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2719         else
2720                 vxlan->age_interval = FDB_AGE_DEFAULT;
2721
2722         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2723                 vxlan->flags |= VXLAN_F_PROXY;
2724
2725         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2726                 vxlan->flags |= VXLAN_F_RSC;
2727
2728         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2729                 vxlan->flags |= VXLAN_F_L2MISS;
2730
2731         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2732                 vxlan->flags |= VXLAN_F_L3MISS;
2733
2734         if (data[IFLA_VXLAN_LIMIT])
2735                 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2736
2737         if (data[IFLA_VXLAN_PORT_RANGE]) {
2738                 const struct ifla_vxlan_port_range *p
2739                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2740                 vxlan->port_min = ntohs(p->low);
2741                 vxlan->port_max = ntohs(p->high);
2742         }
2743
2744         if (data[IFLA_VXLAN_PORT])
2745                 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2746
2747         if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2748                 vxlan->flags |= VXLAN_F_UDP_CSUM;
2749
2750         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2751             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2752                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2753
2754         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2755             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2756                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2757
2758         if (data[IFLA_VXLAN_REMCSUM_TX] &&
2759             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2760                 vxlan->flags |= VXLAN_F_REMCSUM_TX;
2761
2762         if (data[IFLA_VXLAN_REMCSUM_RX] &&
2763             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2764                 vxlan->flags |= VXLAN_F_REMCSUM_RX;
2765
2766         if (data[IFLA_VXLAN_GBP])
2767                 vxlan->flags |= VXLAN_F_GBP;
2768
2769         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2770                 vxlan->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2771
2772         if (vxlan_find_vni(src_net, vni, use_ipv6 ? AF_INET6 : AF_INET,
2773                            vxlan->dst_port, vxlan->flags)) {
2774                 pr_info("duplicate VNI %u\n", vni);
2775                 return -EEXIST;
2776         }
2777
2778         dev->ethtool_ops = &vxlan_ethtool_ops;
2779
2780         /* create an fdb entry for a valid default destination */
2781         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2782                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2783                                        &vxlan->default_dst.remote_ip,
2784                                        NUD_REACHABLE|NUD_PERMANENT,
2785                                        NLM_F_EXCL|NLM_F_CREATE,
2786                                        vxlan->dst_port,
2787                                        vxlan->default_dst.remote_vni,
2788                                        vxlan->default_dst.remote_ifindex,
2789                                        NTF_SELF);
2790                 if (err)
2791                         return err;
2792         }
2793
2794         err = register_netdevice(dev);
2795         if (err) {
2796                 vxlan_fdb_delete_default(vxlan);
2797                 return err;
2798         }
2799
2800         list_add(&vxlan->next, &vn->vxlan_list);
2801
2802         return 0;
2803 }
2804
2805 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2806 {
2807         struct vxlan_dev *vxlan = netdev_priv(dev);
2808         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2809
2810         spin_lock(&vn->sock_lock);
2811         if (!hlist_unhashed(&vxlan->hlist))
2812                 hlist_del_rcu(&vxlan->hlist);
2813         spin_unlock(&vn->sock_lock);
2814
2815         list_del(&vxlan->next);
2816         unregister_netdevice_queue(dev, head);
2817 }
2818
2819 static size_t vxlan_get_size(const struct net_device *dev)
2820 {
2821
2822         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
2823                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2824                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2825                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2826                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
2827                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
2828                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
2829                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
2830                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
2831                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
2832                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
2833                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2834                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2835                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2836                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2837                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2838                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2839                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2840                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2841                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2842                 0;
2843 }
2844
2845 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2846 {
2847         const struct vxlan_dev *vxlan = netdev_priv(dev);
2848         const struct vxlan_rdst *dst = &vxlan->default_dst;
2849         struct ifla_vxlan_port_range ports = {
2850                 .low =  htons(vxlan->port_min),
2851                 .high = htons(vxlan->port_max),
2852         };
2853
2854         if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2855                 goto nla_put_failure;
2856
2857         if (!vxlan_addr_any(&dst->remote_ip)) {
2858                 if (dst->remote_ip.sa.sa_family == AF_INET) {
2859                         if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2860                                          dst->remote_ip.sin.sin_addr.s_addr))
2861                                 goto nla_put_failure;
2862 #if IS_ENABLED(CONFIG_IPV6)
2863                 } else {
2864                         if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2865                                     &dst->remote_ip.sin6.sin6_addr))
2866                                 goto nla_put_failure;
2867 #endif
2868                 }
2869         }
2870
2871         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2872                 goto nla_put_failure;
2873
2874         if (!vxlan_addr_any(&vxlan->saddr)) {
2875                 if (vxlan->saddr.sa.sa_family == AF_INET) {
2876                         if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2877                                          vxlan->saddr.sin.sin_addr.s_addr))
2878                                 goto nla_put_failure;
2879 #if IS_ENABLED(CONFIG_IPV6)
2880                 } else {
2881                         if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2882                                     &vxlan->saddr.sin6.sin6_addr))
2883                                 goto nla_put_failure;
2884 #endif
2885                 }
2886         }
2887
2888         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2889             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2890             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2891                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
2892             nla_put_u8(skb, IFLA_VXLAN_PROXY,
2893                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
2894             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2895             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2896                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2897             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2898                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2899             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2900             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2901             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2902             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2903                         !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2904             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2905                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2906             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2907                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
2908             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
2909                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
2910             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
2911                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
2912                 goto nla_put_failure;
2913
2914         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2915                 goto nla_put_failure;
2916
2917         if (vxlan->flags & VXLAN_F_GBP &&
2918             nla_put_flag(skb, IFLA_VXLAN_GBP))
2919                 goto nla_put_failure;
2920
2921         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
2922             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
2923                 goto nla_put_failure;
2924
2925         return 0;
2926
2927 nla_put_failure:
2928         return -EMSGSIZE;
2929 }
2930
2931 static struct net *vxlan_get_link_net(const struct net_device *dev)
2932 {
2933         struct vxlan_dev *vxlan = netdev_priv(dev);
2934
2935         return vxlan->net;
2936 }
2937
2938 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2939         .kind           = "vxlan",
2940         .maxtype        = IFLA_VXLAN_MAX,
2941         .policy         = vxlan_policy,
2942         .priv_size      = sizeof(struct vxlan_dev),
2943         .setup          = vxlan_setup,
2944         .validate       = vxlan_validate,
2945         .newlink        = vxlan_newlink,
2946         .dellink        = vxlan_dellink,
2947         .get_size       = vxlan_get_size,
2948         .fill_info      = vxlan_fill_info,
2949         .get_link_net   = vxlan_get_link_net,
2950 };
2951
2952 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2953                                              struct net_device *dev)
2954 {
2955         struct vxlan_dev *vxlan, *next;
2956         LIST_HEAD(list_kill);
2957
2958         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2959                 struct vxlan_rdst *dst = &vxlan->default_dst;
2960
2961                 /* In case we created vxlan device with carrier
2962                  * and we loose the carrier due to module unload
2963                  * we also need to remove vxlan device. In other
2964                  * cases, it's not necessary and remote_ifindex
2965                  * is 0 here, so no matches.
2966                  */
2967                 if (dst->remote_ifindex == dev->ifindex)
2968                         vxlan_dellink(vxlan->dev, &list_kill);
2969         }
2970
2971         unregister_netdevice_many(&list_kill);
2972 }
2973
2974 static int vxlan_lowerdev_event(struct notifier_block *unused,
2975                                 unsigned long event, void *ptr)
2976 {
2977         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2978         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2979
2980         if (event == NETDEV_UNREGISTER)
2981                 vxlan_handle_lowerdev_unregister(vn, dev);
2982
2983         return NOTIFY_DONE;
2984 }
2985
2986 static struct notifier_block vxlan_notifier_block __read_mostly = {
2987         .notifier_call = vxlan_lowerdev_event,
2988 };
2989
2990 static __net_init int vxlan_init_net(struct net *net)
2991 {
2992         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2993         unsigned int h;
2994
2995         INIT_LIST_HEAD(&vn->vxlan_list);
2996         spin_lock_init(&vn->sock_lock);
2997
2998         for (h = 0; h < PORT_HASH_SIZE; ++h)
2999                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3000
3001         return 0;
3002 }
3003
3004 static void __net_exit vxlan_exit_net(struct net *net)
3005 {
3006         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3007         struct vxlan_dev *vxlan, *next;
3008         struct net_device *dev, *aux;
3009         LIST_HEAD(list);
3010
3011         rtnl_lock();
3012         for_each_netdev_safe(net, dev, aux)
3013                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3014                         unregister_netdevice_queue(dev, &list);
3015
3016         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3017                 /* If vxlan->dev is in the same netns, it has already been added
3018                  * to the list by the previous loop.
3019                  */
3020                 if (!net_eq(dev_net(vxlan->dev), net))
3021                         unregister_netdevice_queue(dev, &list);
3022         }
3023
3024         unregister_netdevice_many(&list);
3025         rtnl_unlock();
3026 }
3027
3028 static struct pernet_operations vxlan_net_ops = {
3029         .init = vxlan_init_net,
3030         .exit = vxlan_exit_net,
3031         .id   = &vxlan_net_id,
3032         .size = sizeof(struct vxlan_net),
3033 };
3034
3035 static int __init vxlan_init_module(void)
3036 {
3037         int rc;
3038
3039         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3040         if (!vxlan_wq)
3041                 return -ENOMEM;
3042
3043         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3044
3045         rc = register_pernet_subsys(&vxlan_net_ops);
3046         if (rc)
3047                 goto out1;
3048
3049         rc = register_netdevice_notifier(&vxlan_notifier_block);
3050         if (rc)
3051                 goto out2;
3052
3053         rc = rtnl_link_register(&vxlan_link_ops);
3054         if (rc)
3055                 goto out3;
3056
3057         return 0;
3058 out3:
3059         unregister_netdevice_notifier(&vxlan_notifier_block);
3060 out2:
3061         unregister_pernet_subsys(&vxlan_net_ops);
3062 out1:
3063         destroy_workqueue(vxlan_wq);
3064         return rc;
3065 }
3066 late_initcall(vxlan_init_module);
3067
3068 static void __exit vxlan_cleanup_module(void)
3069 {
3070         rtnl_link_unregister(&vxlan_link_ops);
3071         unregister_netdevice_notifier(&vxlan_notifier_block);
3072         destroy_workqueue(vxlan_wq);
3073         unregister_pernet_subsys(&vxlan_net_ops);
3074         /* rcu_barrier() is called by netns */
3075 }
3076 module_exit(vxlan_cleanup_module);
3077
3078 MODULE_LICENSE("GPL");
3079 MODULE_VERSION(VXLAN_VERSION);
3080 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3081 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3082 MODULE_ALIAS_RTNL_LINK("vxlan");