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 #include <net/dst_metadata.h>
  53
  54 #define VXLAN_VERSION   "0.1"
  55
  56 #define PORT_HASH_BITS  8
  57 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  58 #define FDB_AGE_DEFAULT 300 /* 5 min */
  59 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  60
  61 /* UDP port for VXLAN traffic.
  62  * The IANA assigned port is 4789, but the Linux default is 8472
  63  * for compatibility with early adopters.
  64  */
  65 static unsigned short vxlan_port __read_mostly = 8472;
  66 module_param_named(udp_port, vxlan_port, ushort, 0444);
  67 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  68
  69 static bool log_ecn_error = true;
  70 module_param(log_ecn_error, bool, 0644);
  71 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  72
  73 static int vxlan_net_id;
  74 static struct rtnl_link_ops vxlan_link_ops;
  75
  76 static const u8 all_zeros_mac[ETH_ALEN];
  77
  78 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  79
  80 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
  81
  82 /* per-network namespace private data for this module */
  83 struct vxlan_net {
  84         struct list_head  vxlan_list;
  85         struct hlist_head sock_list[PORT_HASH_SIZE];
  86         spinlock_t        sock_lock;
  87 };
  88
  89 /* Forwarding table entry */
  90 struct vxlan_fdb {
  91         struct hlist_node hlist;        /* linked list of entries */
  92         struct rcu_head   rcu;
  93         unsigned long     updated;      /* jiffies */
  94         unsigned long     used;
  95         struct list_head  remotes;
  96         u8                eth_addr[ETH_ALEN];
  97         u16               state;        /* see ndm_state */
  98         u8                flags;        /* see ndm_flags */
  99 };
 100
 101 /* salt for hash table */
 102 static u32 vxlan_salt __read_mostly;
 103 static struct workqueue_struct *vxlan_wq;
 104
 105 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
 106 {
 107         return vs->flags & VXLAN_F_COLLECT_METADATA ||
 108                ip_tunnel_collect_metadata();
 109 }
 110
 111 #if IS_ENABLED(CONFIG_IPV6)
 112 static inline
 113 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 114 {
 115         if (a->sa.sa_family != b->sa.sa_family)
 116                 return false;
 117         if (a->sa.sa_family == AF_INET6)
 118                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 119         else
 120                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 121 }
 122
 123 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 124 {
 125         if (ipa->sa.sa_family == AF_INET6)
 126                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
 127         else
 128                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 129 }
 130
 131 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 132 {
 133         if (ipa->sa.sa_family == AF_INET6)
 134                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 135         else
 136                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 137 }
 138
 139 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 140 {
 141         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 142                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 143                 ip->sa.sa_family = AF_INET6;
 144                 return 0;
 145         } else if (nla_len(nla) >= sizeof(__be32)) {
 146                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 147                 ip->sa.sa_family = AF_INET;
 148                 return 0;
 149         } else {
 150                 return -EAFNOSUPPORT;
 151         }
 152 }
 153
 154 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 155                               const union vxlan_addr *ip)
 156 {
 157         if (ip->sa.sa_family == AF_INET6)
 158                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 159         else
 160                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 161 }
 162
 163 #else /* !CONFIG_IPV6 */
 164
 165 static inline
 166 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 167 {
 168         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 169 }
 170
 171 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 172 {
 173         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 174 }
 175
 176 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 177 {
 178         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 179 }
 180
 181 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 182 {
 183         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 184                 return -EAFNOSUPPORT;
 185         } else if (nla_len(nla) >= sizeof(__be32)) {
 186                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 187                 ip->sa.sa_family = AF_INET;
 188                 return 0;
 189         } else {
 190                 return -EAFNOSUPPORT;
 191         }
 192 }
 193
 194 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 195                               const union vxlan_addr *ip)
 196 {
 197         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 198 }
 199 #endif
 200
 201 /* Virtual Network hash table head */
 202 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
 203 {
 204         return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
 205 }
 206
 207 /* Socket hash table head */
 208 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 209 {
 210         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 211
 212         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 213 }
 214
 215 /* First remote destination for a forwarding entry.
 216  * Guaranteed to be non-NULL because remotes are never deleted.
 217  */
 218 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 219 {
 220         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 221 }
 222
 223 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 224 {
 225         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 226 }
 227
 228 /* Find VXLAN socket based on network namespace, address family and UDP port
 229  * and enabled unshareable flags.
 230  */
 231 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 232                                           __be16 port, u32 flags)
 233 {
 234         struct vxlan_sock *vs;
 235
 236         flags &= VXLAN_F_RCV_FLAGS;
 237
 238         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 239                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 240                     vxlan_get_sk_family(vs) == family &&
 241                     vs->flags == flags)
 242                         return vs;
 243         }
 244         return NULL;
 245 }
 246
 247 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
 248 {
 249         struct vxlan_dev *vxlan;
 250
 251         hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
 252                 if (vxlan->default_dst.remote_vni == id)
 253                         return vxlan;
 254         }
 255
 256         return NULL;
 257 }
 258
 259 /* Look up VNI in a per net namespace table */
 260 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
 261                                         sa_family_t family, __be16 port,
 262                                         u32 flags)
 263 {
 264         struct vxlan_sock *vs;
 265
 266         vs = vxlan_find_sock(net, family, port, flags);
 267         if (!vs)
 268                 return NULL;
 269
 270         return vxlan_vs_find_vni(vs, id);
 271 }
 272
 273 /* Fill in neighbour message in skbuff. */
 274 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 275                           const struct vxlan_fdb *fdb,
 276                           u32 portid, u32 seq, int type, unsigned int flags,
 277                           const struct vxlan_rdst *rdst)
 278 {
 279         unsigned long now = jiffies;
 280         struct nda_cacheinfo ci;
 281         struct nlmsghdr *nlh;
 282         struct ndmsg *ndm;
 283         bool send_ip, send_eth;
 284
 285         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 286         if (nlh == NULL)
 287                 return -EMSGSIZE;
 288
 289         ndm = nlmsg_data(nlh);
 290         memset(ndm, 0, sizeof(*ndm));
 291
 292         send_eth = send_ip = true;
 293
 294         if (type == RTM_GETNEIGH) {
 295                 ndm->ndm_family = AF_INET;
 296                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 297                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 298         } else
 299                 ndm->ndm_family = AF_BRIDGE;
 300         ndm->ndm_state = fdb->state;
 301         ndm->ndm_ifindex = vxlan->dev->ifindex;
 302         ndm->ndm_flags = fdb->flags;
 303         ndm->ndm_type = RTN_UNICAST;
 304
 305         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 306             nla_put_s32(skb, NDA_LINK_NETNSID,
 307                         peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
 308                 goto nla_put_failure;
 309
 310         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 311                 goto nla_put_failure;
 312
 313         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 314                 goto nla_put_failure;
 315
 316         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
 317             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 318                 goto nla_put_failure;
 319         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 320             nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
 321                 goto nla_put_failure;
 322         if (rdst->remote_ifindex &&
 323             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 324                 goto nla_put_failure;
 325
 326         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 327         ci.ndm_confirmed = 0;
 328         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 329         ci.ndm_refcnt    = 0;
 330
 331         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 332                 goto nla_put_failure;
 333
 334         nlmsg_end(skb, nlh);
 335         return 0;
 336
 337 nla_put_failure:
 338         nlmsg_cancel(skb, nlh);
 339         return -EMSGSIZE;
 340 }
 341
 342 static inline size_t vxlan_nlmsg_size(void)
 343 {
 344         return NLMSG_ALIGN(sizeof(struct ndmsg))
 345                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 346                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 347                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 348                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 349                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 350                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 351                 + nla_total_size(sizeof(struct nda_cacheinfo));
 352 }
 353
 354 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 355                              struct vxlan_rdst *rd, int type)
 356 {
 357         struct net *net = dev_net(vxlan->dev);
 358         struct sk_buff *skb;
 359         int err = -ENOBUFS;
 360
 361         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 362         if (skb == NULL)
 363                 goto errout;
 364
 365         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 366         if (err < 0) {
 367                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 368                 WARN_ON(err == -EMSGSIZE);
 369                 kfree_skb(skb);
 370                 goto errout;
 371         }
 372
 373         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 374         return;
 375 errout:
 376         if (err < 0)
 377                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 378 }
 379
 380 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 381 {
 382         struct vxlan_dev *vxlan = netdev_priv(dev);
 383         struct vxlan_fdb f = {
 384                 .state = NUD_STALE,
 385         };
 386         struct vxlan_rdst remote = {
 387                 .remote_ip = *ipa, /* goes to NDA_DST */
 388                 .remote_vni = VXLAN_N_VID,
 389         };
 390
 391         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 392 }
 393
 394 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 395 {
 396         struct vxlan_fdb f = {
 397                 .state = NUD_STALE,
 398         };
 399         struct vxlan_rdst remote = { };
 400
 401         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 402
 403         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 404 }
 405
 406 /* Hash Ethernet address */
 407 static u32 eth_hash(const unsigned char *addr)
 408 {
 409         u64 value = get_unaligned((u64 *)addr);
 410
 411         /* only want 6 bytes */
 412 #ifdef __BIG_ENDIAN
 413         value >>= 16;
 414 #else
 415         value <<= 16;
 416 #endif
 417         return hash_64(value, FDB_HASH_BITS);
 418 }
 419
 420 /* Hash chain to use given mac address */
 421 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 422                                                 const u8 *mac)
 423 {
 424         return &vxlan->fdb_head[eth_hash(mac)];
 425 }
 426
 427 /* Look up Ethernet address in forwarding table */
 428 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 429                                         const u8 *mac)
 430 {
 431         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 432         struct vxlan_fdb *f;
 433
 434         hlist_for_each_entry_rcu(f, head, hlist) {
 435                 if (ether_addr_equal(mac, f->eth_addr))
 436                         return f;
 437         }
 438
 439         return NULL;
 440 }
 441
 442 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 443                                         const u8 *mac)
 444 {
 445         struct vxlan_fdb *f;
 446
 447         f = __vxlan_find_mac(vxlan, mac);
 448         if (f)
 449                 f->used = jiffies;
 450
 451         return f;
 452 }
 453
 454 /* caller should hold vxlan->hash_lock */
 455 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 456                                               union vxlan_addr *ip, __be16 port,
 457                                               __u32 vni, __u32 ifindex)
 458 {
 459         struct vxlan_rdst *rd;
 460
 461         list_for_each_entry(rd, &f->remotes, list) {
 462                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 463                     rd->remote_port == port &&
 464                     rd->remote_vni == vni &&
 465                     rd->remote_ifindex == ifindex)
 466                         return rd;
 467         }
 468
 469         return NULL;
 470 }
 471
 472 /* Replace destination of unicast mac */
 473 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 474                              union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
 475 {
 476         struct vxlan_rdst *rd;
 477
 478         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 479         if (rd)
 480                 return 0;
 481
 482         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 483         if (!rd)
 484                 return 0;
 485         rd->remote_ip = *ip;
 486         rd->remote_port = port;
 487         rd->remote_vni = vni;
 488         rd->remote_ifindex = ifindex;
 489         return 1;
 490 }
 491
 492 /* Add/update destinations for multicast */
 493 static int vxlan_fdb_append(struct vxlan_fdb *f,
 494                             union vxlan_addr *ip, __be16 port, __u32 vni,
 495                             __u32 ifindex, struct vxlan_rdst **rdp)
 496 {
 497         struct vxlan_rdst *rd;
 498
 499         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 500         if (rd)
 501                 return 0;
 502
 503         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 504         if (rd == NULL)
 505                 return -ENOBUFS;
 506         rd->remote_ip = *ip;
 507         rd->remote_port = port;
 508         rd->remote_vni = vni;
 509         rd->remote_ifindex = ifindex;
 510
 511         list_add_tail_rcu(&rd->list, &f->remotes);
 512
 513         *rdp = rd;
 514         return 1;
 515 }
 516
 517 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 518                                           unsigned int off,
 519                                           struct vxlanhdr *vh, size_t hdrlen,
 520                                           u32 data, struct gro_remcsum *grc,
 521                                           bool nopartial)
 522 {
 523         size_t start, offset;
 524
 525         if (skb->remcsum_offload)
 526                 return vh;
 527
 528         if (!NAPI_GRO_CB(skb)->csum_valid)
 529                 return NULL;
 530
 531         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
 532         offset = start + ((data & VXLAN_RCO_UDP) ?
 533                           offsetof(struct udphdr, check) :
 534                           offsetof(struct tcphdr, check));
 535
 536         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 537                                      start, offset, grc, nopartial);
 538
 539         skb->remcsum_offload = 1;
 540
 541         return vh;
 542 }
 543
 544 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
 545                                           struct sk_buff *skb,
 546                                           struct udp_offload *uoff)
 547 {
 548         struct sk_buff *p, **pp = NULL;
 549         struct vxlanhdr *vh, *vh2;
 550         unsigned int hlen, off_vx;
 551         int flush = 1;
 552         struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
 553                                              udp_offloads);
 554         u32 flags;
 555         struct gro_remcsum grc;
 556
 557         skb_gro_remcsum_init(&grc);
 558
 559         off_vx = skb_gro_offset(skb);
 560         hlen = off_vx + sizeof(*vh);
 561         vh   = skb_gro_header_fast(skb, off_vx);
 562         if (skb_gro_header_hard(skb, hlen)) {
 563                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 564                 if (unlikely(!vh))
 565                         goto out;
 566         }
 567
 568         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 569
 570         flags = ntohl(vh->vx_flags);
 571
 572         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 573                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 574                                        ntohl(vh->vx_vni), &grc,
 575                                        !!(vs->flags &
 576                                           VXLAN_F_REMCSUM_NOPARTIAL));
 577
 578                 if (!vh)
 579                         goto out;
 580         }
 581
 582         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 583
 584         flush = 0;
 585
 586         for (p = *head; p; p = p->next) {
 587                 if (!NAPI_GRO_CB(p)->same_flow)
 588                         continue;
 589
 590                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 591                 if (vh->vx_flags != vh2->vx_flags ||
 592                     vh->vx_vni != vh2->vx_vni) {
 593                         NAPI_GRO_CB(p)->same_flow = 0;
 594                         continue;
 595                 }
 596         }
 597
 598         pp = call_gro_receive(eth_gro_receive, head, skb);
 599
 600 out:
 601         skb_gro_remcsum_cleanup(skb, &grc);
 602         NAPI_GRO_CB(skb)->flush |= flush;
 603
 604         return pp;
 605 }
 606
 607 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
 608                               struct udp_offload *uoff)
 609 {
 610         udp_tunnel_gro_complete(skb, nhoff);
 611
 612         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 613 }
 614
 615 /* Notify netdevs that UDP port started listening */
 616 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
 617 {
 618         struct net_device *dev;
 619         struct sock *sk = vs->sock->sk;
 620         struct net *net = sock_net(sk);
 621         sa_family_t sa_family = vxlan_get_sk_family(vs);
 622         __be16 port = inet_sk(sk)->inet_sport;
 623         int err;
 624
 625         if (sa_family == AF_INET) {
 626                 err = udp_add_offload(&vs->udp_offloads);
 627                 if (err)
 628                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
 629         }
 630
 631         rcu_read_lock();
 632         for_each_netdev_rcu(net, dev) {
 633                 if (dev->netdev_ops->ndo_add_vxlan_port)
 634                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
 635                                                             port);
 636         }
 637         rcu_read_unlock();
 638 }
 639
 640 /* Notify netdevs that UDP port is no more listening */
 641 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
 642 {
 643         struct net_device *dev;
 644         struct sock *sk = vs->sock->sk;
 645         struct net *net = sock_net(sk);
 646         sa_family_t sa_family = vxlan_get_sk_family(vs);
 647         __be16 port = inet_sk(sk)->inet_sport;
 648
 649         rcu_read_lock();
 650         for_each_netdev_rcu(net, dev) {
 651                 if (dev->netdev_ops->ndo_del_vxlan_port)
 652                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
 653                                                             port);
 654         }
 655         rcu_read_unlock();
 656
 657         if (sa_family == AF_INET)
 658                 udp_del_offload(&vs->udp_offloads);
 659 }
 660
 661 /* Add new entry to forwarding table -- assumes lock held */
 662 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 663                             const u8 *mac, union vxlan_addr *ip,
 664                             __u16 state, __u16 flags,
 665                             __be16 port, __u32 vni, __u32 ifindex,
 666                             __u8 ndm_flags)
 667 {
 668         struct vxlan_rdst *rd = NULL;
 669         struct vxlan_fdb *f;
 670         int notify = 0;
 671
 672         f = __vxlan_find_mac(vxlan, mac);
 673         if (f) {
 674                 if (flags & NLM_F_EXCL) {
 675                         netdev_dbg(vxlan->dev,
 676                                    "lost race to create %pM\n", mac);
 677                         return -EEXIST;
 678                 }
 679                 if (f->state != state) {
 680                         f->state = state;
 681                         f->updated = jiffies;
 682                         notify = 1;
 683                 }
 684                 if (f->flags != ndm_flags) {
 685                         f->flags = ndm_flags;
 686                         f->updated = jiffies;
 687                         notify = 1;
 688                 }
 689                 if ((flags & NLM_F_REPLACE)) {
 690                         /* Only change unicasts */
 691                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 692                              is_zero_ether_addr(f->eth_addr))) {
 693                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
 694                                                            ifindex);
 695                         } else
 696                                 return -EOPNOTSUPP;
 697                 }
 698                 if ((flags & NLM_F_APPEND) &&
 699                     (is_multicast_ether_addr(f->eth_addr) ||
 700                      is_zero_ether_addr(f->eth_addr))) {
 701                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
 702                                                   &rd);
 703
 704                         if (rc < 0)
 705                                 return rc;
 706                         notify |= rc;
 707                 }
 708         } else {
 709                 if (!(flags & NLM_F_CREATE))
 710                         return -ENOENT;
 711
 712                 if (vxlan->cfg.addrmax &&
 713                     vxlan->addrcnt >= vxlan->cfg.addrmax)
 714                         return -ENOSPC;
 715
 716                 /* Disallow replace to add a multicast entry */
 717                 if ((flags & NLM_F_REPLACE) &&
 718                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 719                         return -EOPNOTSUPP;
 720
 721                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 722                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 723                 if (!f)
 724                         return -ENOMEM;
 725
 726                 notify = 1;
 727                 f->state = state;
 728                 f->flags = ndm_flags;
 729                 f->updated = f->used = jiffies;
 730                 INIT_LIST_HEAD(&f->remotes);
 731                 memcpy(f->eth_addr, mac, ETH_ALEN);
 732
 733                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 734
 735                 ++vxlan->addrcnt;
 736                 hlist_add_head_rcu(&f->hlist,
 737                                    vxlan_fdb_head(vxlan, mac));
 738         }
 739
 740         if (notify) {
 741                 if (rd == NULL)
 742                         rd = first_remote_rtnl(f);
 743                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 744         }
 745
 746         return 0;
 747 }
 748
 749 static void vxlan_fdb_free(struct rcu_head *head)
 750 {
 751         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 752         struct vxlan_rdst *rd, *nd;
 753
 754         list_for_each_entry_safe(rd, nd, &f->remotes, list)
 755                 kfree(rd);
 756         kfree(f);
 757 }
 758
 759 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 760 {
 761         netdev_dbg(vxlan->dev,
 762                     "delete %pM\n", f->eth_addr);
 763
 764         --vxlan->addrcnt;
 765         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 766
 767         hlist_del_rcu(&f->hlist);
 768         call_rcu(&f->rcu, vxlan_fdb_free);
 769 }
 770
 771 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 772                            union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
 773 {
 774         struct net *net = dev_net(vxlan->dev);
 775         int err;
 776
 777         if (tb[NDA_DST]) {
 778                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 779                 if (err)
 780                         return err;
 781         } else {
 782                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 783                 if (remote->sa.sa_family == AF_INET) {
 784                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 785                         ip->sa.sa_family = AF_INET;
 786 #if IS_ENABLED(CONFIG_IPV6)
 787                 } else {
 788                         ip->sin6.sin6_addr = in6addr_any;
 789                         ip->sa.sa_family = AF_INET6;
 790 #endif
 791                 }
 792         }
 793
 794         if (tb[NDA_PORT]) {
 795                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 796                         return -EINVAL;
 797                 *port = nla_get_be16(tb[NDA_PORT]);
 798         } else {
 799                 *port = vxlan->cfg.dst_port;
 800         }
 801
 802         if (tb[NDA_VNI]) {
 803                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 804                         return -EINVAL;
 805                 *vni = nla_get_u32(tb[NDA_VNI]);
 806         } else {
 807                 *vni = vxlan->default_dst.remote_vni;
 808         }
 809
 810         if (tb[NDA_IFINDEX]) {
 811                 struct net_device *tdev;
 812
 813                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 814                         return -EINVAL;
 815                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 816                 tdev = __dev_get_by_index(net, *ifindex);
 817                 if (!tdev)
 818                         return -EADDRNOTAVAIL;
 819         } else {
 820                 *ifindex = 0;
 821         }
 822
 823         return 0;
 824 }
 825
 826 /* Add static entry (via netlink) */
 827 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 828                          struct net_device *dev,
 829                          const unsigned char *addr, u16 vid, u16 flags)
 830 {
 831         struct vxlan_dev *vxlan = netdev_priv(dev);
 832         /* struct net *net = dev_net(vxlan->dev); */
 833         union vxlan_addr ip;
 834         __be16 port;
 835         u32 vni, ifindex;
 836         int err;
 837
 838         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 839                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 840                         ndm->ndm_state);
 841                 return -EINVAL;
 842         }
 843
 844         if (tb[NDA_DST] == NULL)
 845                 return -EINVAL;
 846
 847         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 848         if (err)
 849                 return err;
 850
 851         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 852                 return -EAFNOSUPPORT;
 853
 854         spin_lock_bh(&vxlan->hash_lock);
 855         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 856                                port, vni, ifindex, ndm->ndm_flags);
 857         spin_unlock_bh(&vxlan->hash_lock);
 858
 859         return err;
 860 }
 861
 862 /* Delete entry (via netlink) */
 863 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 864                             struct net_device *dev,
 865                             const unsigned char *addr, u16 vid)
 866 {
 867         struct vxlan_dev *vxlan = netdev_priv(dev);
 868         struct vxlan_fdb *f;
 869         struct vxlan_rdst *rd = NULL;
 870         union vxlan_addr ip;
 871         __be16 port;
 872         u32 vni, ifindex;
 873         int err;
 874
 875         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 876         if (err)
 877                 return err;
 878
 879         err = -ENOENT;
 880
 881         spin_lock_bh(&vxlan->hash_lock);
 882         f = vxlan_find_mac(vxlan, addr);
 883         if (!f)
 884                 goto out;
 885
 886         if (!vxlan_addr_any(&ip)) {
 887                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 888                 if (!rd)
 889                         goto out;
 890         }
 891
 892         err = 0;
 893
 894         /* remove a destination if it's not the only one on the list,
 895          * otherwise destroy the fdb entry
 896          */
 897         if (rd && !list_is_singular(&f->remotes)) {
 898                 list_del_rcu(&rd->list);
 899                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 900                 kfree_rcu(rd, rcu);
 901                 goto out;
 902         }
 903
 904         vxlan_fdb_destroy(vxlan, f);
 905
 906 out:
 907         spin_unlock_bh(&vxlan->hash_lock);
 908
 909         return err;
 910 }
 911
 912 /* Dump forwarding table */
 913 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 914                           struct net_device *dev,
 915                           struct net_device *filter_dev, int idx)
 916 {
 917         struct vxlan_dev *vxlan = netdev_priv(dev);
 918         unsigned int h;
 919
 920         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 921                 struct vxlan_fdb *f;
 922                 int err;
 923
 924                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 925                         struct vxlan_rdst *rd;
 926
 927                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 928                                 if (idx < cb->args[0])
 929                                         goto skip;
 930
 931                                 err = vxlan_fdb_info(skb, vxlan, f,
 932                                                      NETLINK_CB(cb->skb).portid,
 933                                                      cb->nlh->nlmsg_seq,
 934                                                      RTM_NEWNEIGH,
 935                                                      NLM_F_MULTI, rd);
 936                                 if (err < 0)
 937                                         goto out;
 938 skip:
 939                                 ++idx;
 940                         }
 941                 }
 942         }
 943 out:
 944         return idx;
 945 }
 946
 947 /* Watch incoming packets to learn mapping between Ethernet address
 948  * and Tunnel endpoint.
 949  * Return true if packet is bogus and should be dropped.
 950  */
 951 static bool vxlan_snoop(struct net_device *dev,
 952                         union vxlan_addr *src_ip, const u8 *src_mac)
 953 {
 954         struct vxlan_dev *vxlan = netdev_priv(dev);
 955         struct vxlan_fdb *f;
 956
 957         f = vxlan_find_mac(vxlan, src_mac);
 958         if (likely(f)) {
 959                 struct vxlan_rdst *rdst = first_remote_rcu(f);
 960
 961                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
 962                         return false;
 963
 964                 /* Don't migrate static entries, drop packets */
 965                 if (f->state & (NUD_PERMANENT | NUD_NOARP))
 966                         return true;
 967
 968                 if (net_ratelimit())
 969                         netdev_info(dev,
 970                                     "%pM migrated from %pIS to %pIS\n",
 971                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
 972
 973                 rdst->remote_ip = *src_ip;
 974                 f->updated = jiffies;
 975                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
 976         } else {
 977                 /* learned new entry */
 978                 spin_lock(&vxlan->hash_lock);
 979
 980                 /* close off race between vxlan_flush and incoming packets */
 981                 if (netif_running(dev))
 982                         vxlan_fdb_create(vxlan, src_mac, src_ip,
 983                                          NUD_REACHABLE,
 984                                          NLM_F_EXCL|NLM_F_CREATE,
 985                                          vxlan->cfg.dst_port,
 986                                          vxlan->default_dst.remote_vni,
 987                                          0, NTF_SELF);
 988                 spin_unlock(&vxlan->hash_lock);
 989         }
 990
 991         return false;
 992 }
 993
 994 /* See if multicast group is already in use by other ID */
 995 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
 996 {
 997         struct vxlan_dev *vxlan;
 998         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
 999
1000         /* The vxlan_sock is only used by dev, leaving group has
1001          * no effect on other vxlan devices.
1002          */
1003         if (family == AF_INET && dev->vn4_sock &&
1004             atomic_read(&dev->vn4_sock->refcnt) == 1)
1005                 return false;
1006 #if IS_ENABLED(CONFIG_IPV6)
1007         if (family == AF_INET6 && dev->vn6_sock &&
1008             atomic_read(&dev->vn6_sock->refcnt) == 1)
1009                 return false;
1010 #endif
1011
1012         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1013                 if (!netif_running(vxlan->dev) || vxlan == dev)
1014                         continue;
1015
1016                 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1017                         continue;
1018 #if IS_ENABLED(CONFIG_IPV6)
1019                 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1020                         continue;
1021 #endif
1022
1023                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1024                                       &dev->default_dst.remote_ip))
1025                         continue;
1026
1027                 if (vxlan->default_dst.remote_ifindex !=
1028                     dev->default_dst.remote_ifindex)
1029                         continue;
1030
1031                 return true;
1032         }
1033
1034         return false;
1035 }
1036
1037 static void __vxlan_sock_release(struct vxlan_sock *vs)
1038 {
1039         struct vxlan_net *vn;
1040
1041         if (!vs)
1042                 return;
1043         if (!atomic_dec_and_test(&vs->refcnt))
1044                 return;
1045
1046         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1047         spin_lock(&vn->sock_lock);
1048         hlist_del_rcu(&vs->hlist);
1049         vxlan_notify_del_rx_port(vs);
1050         spin_unlock(&vn->sock_lock);
1051
1052         queue_work(vxlan_wq, &vs->del_work);
1053 }
1054
1055 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1056 {
1057         vxlan_vs_del_dev(vxlan);
1058
1059         __vxlan_sock_release(vxlan->vn4_sock);
1060 #if IS_ENABLED(CONFIG_IPV6)
1061         __vxlan_sock_release(vxlan->vn6_sock);
1062 #endif
1063 }
1064
1065 /* Update multicast group membership when first VNI on
1066  * multicast address is brought up
1067  */
1068 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1069 {
1070         struct sock *sk;
1071         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1072         int ifindex = vxlan->default_dst.remote_ifindex;
1073         int ret = -EINVAL;
1074
1075         if (ip->sa.sa_family == AF_INET) {
1076                 struct ip_mreqn mreq = {
1077                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1078                         .imr_ifindex            = ifindex,
1079                 };
1080
1081                 sk = vxlan->vn4_sock->sock->sk;
1082                 lock_sock(sk);
1083                 ret = ip_mc_join_group(sk, &mreq);
1084                 release_sock(sk);
1085 #if IS_ENABLED(CONFIG_IPV6)
1086         } else {
1087                 sk = vxlan->vn6_sock->sock->sk;
1088                 lock_sock(sk);
1089                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1090                                                    &ip->sin6.sin6_addr);
1091                 release_sock(sk);
1092 #endif
1093         }
1094
1095         return ret;
1096 }
1097
1098 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1099 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1100 {
1101         struct sock *sk;
1102         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1103         int ifindex = vxlan->default_dst.remote_ifindex;
1104         int ret = -EINVAL;
1105
1106         if (ip->sa.sa_family == AF_INET) {
1107                 struct ip_mreqn mreq = {
1108                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1109                         .imr_ifindex            = ifindex,
1110                 };
1111
1112                 sk = vxlan->vn4_sock->sock->sk;
1113                 lock_sock(sk);
1114                 ret = ip_mc_leave_group(sk, &mreq);
1115                 release_sock(sk);
1116 #if IS_ENABLED(CONFIG_IPV6)
1117         } else {
1118                 sk = vxlan->vn6_sock->sock->sk;
1119                 lock_sock(sk);
1120                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1121                                                    &ip->sin6.sin6_addr);
1122                 release_sock(sk);
1123 #endif
1124         }
1125
1126         return ret;
1127 }
1128
1129 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1130                                       size_t hdrlen, u32 data, bool nopartial)
1131 {
1132         size_t start, offset, plen;
1133
1134         if (skb->remcsum_offload)
1135                 return vh;
1136
1137         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1138         offset = start + ((data & VXLAN_RCO_UDP) ?
1139                           offsetof(struct udphdr, check) :
1140                           offsetof(struct tcphdr, check));
1141
1142         plen = hdrlen + offset + sizeof(u16);
1143
1144         if (!pskb_may_pull(skb, plen))
1145                 return NULL;
1146
1147         vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1148
1149         skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1150                             nopartial);
1151
1152         return vh;
1153 }
1154
1155 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1156                       struct vxlan_metadata *md, u32 vni,
1157                       struct metadata_dst *tun_dst)
1158 {
1159         struct iphdr *oip = NULL;
1160         struct ipv6hdr *oip6 = NULL;
1161         struct vxlan_dev *vxlan;
1162         struct pcpu_sw_netstats *stats;
1163         union vxlan_addr saddr;
1164         int err = 0;
1165
1166         /* For flow based devices, map all packets to VNI 0 */
1167         if (vs->flags & VXLAN_F_COLLECT_METADATA)
1168                 vni = 0;
1169
1170         /* Is this VNI defined? */
1171         vxlan = vxlan_vs_find_vni(vs, vni);
1172         if (!vxlan)
1173                 goto drop;
1174
1175         skb_reset_mac_header(skb);
1176         skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1177         skb->protocol = eth_type_trans(skb, vxlan->dev);
1178         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1179
1180         /* Ignore packet loops (and multicast echo) */
1181         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1182                 goto drop;
1183
1184         /* Get data from the outer IP header */
1185         if (vxlan_get_sk_family(vs) == AF_INET) {
1186                 oip = ip_hdr(skb);
1187                 saddr.sin.sin_addr.s_addr = oip->saddr;
1188                 saddr.sa.sa_family = AF_INET;
1189 #if IS_ENABLED(CONFIG_IPV6)
1190         } else {
1191                 oip6 = ipv6_hdr(skb);
1192                 saddr.sin6.sin6_addr = oip6->saddr;
1193                 saddr.sa.sa_family = AF_INET6;
1194 #endif
1195         }
1196
1197         if (tun_dst) {
1198                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1199                 tun_dst = NULL;
1200         }
1201
1202         if ((vxlan->flags & VXLAN_F_LEARN) &&
1203             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1204                 goto drop;
1205
1206         skb_reset_network_header(skb);
1207         /* In flow-based mode, GBP is carried in dst_metadata */
1208         if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1209                 skb->mark = md->gbp;
1210
1211         if (oip6)
1212                 err = IP6_ECN_decapsulate(oip6, skb);
1213         if (oip)
1214                 err = IP_ECN_decapsulate(oip, skb);
1215
1216         if (unlikely(err)) {
1217                 if (log_ecn_error) {
1218                         if (oip6)
1219                                 net_info_ratelimited("non-ECT from %pI6\n",
1220                                                      &oip6->saddr);
1221                         if (oip)
1222                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1223                                                      &oip->saddr, oip->tos);
1224                 }
1225                 if (err > 1) {
1226                         ++vxlan->dev->stats.rx_frame_errors;
1227                         ++vxlan->dev->stats.rx_errors;
1228                         goto drop;
1229                 }
1230         }
1231
1232         stats = this_cpu_ptr(vxlan->dev->tstats);
1233         u64_stats_update_begin(&stats->syncp);
1234         stats->rx_packets++;
1235         stats->rx_bytes += skb->len;
1236         u64_stats_update_end(&stats->syncp);
1237
1238         gro_cells_receive(&vxlan->gro_cells, skb);
1239
1240         return;
1241 drop:
1242         if (tun_dst)
1243                 dst_release((struct dst_entry *)tun_dst);
1244
1245         /* Consume bad packet */
1246         kfree_skb(skb);
1247 }
1248
1249 /* Callback from net/ipv4/udp.c to receive packets */
1250 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1251 {
1252         struct metadata_dst *tun_dst = NULL;
1253         struct vxlan_sock *vs;
1254         struct vxlanhdr *vxh;
1255         u32 flags, vni;
1256         struct vxlan_metadata _md;
1257         struct vxlan_metadata *md = &_md;
1258
1259         /* Need Vxlan and inner Ethernet header to be present */
1260         if (!pskb_may_pull(skb, VXLAN_HLEN))
1261                 goto drop;
1262
1263         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1264         flags = ntohl(vxh->vx_flags);
1265         vni = ntohl(vxh->vx_vni);
1266
1267         if (flags & VXLAN_HF_VNI) {
1268                 flags &= ~VXLAN_HF_VNI;
1269         } else {
1270                 /* VNI flag always required to be set */
1271                 goto bad_flags;
1272         }
1273
1274         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1275                 goto drop;
1276         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1277
1278         vs = rcu_dereference_sk_user_data(sk);
1279         if (!vs)
1280                 goto drop;
1281
1282         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1283                 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1284                                     !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1285                 if (!vxh)
1286                         goto drop;
1287
1288                 flags &= ~VXLAN_HF_RCO;
1289                 vni &= VXLAN_VNI_MASK;
1290         }
1291
1292         if (vxlan_collect_metadata(vs)) {
1293                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1294                                          cpu_to_be64(vni >> 8), sizeof(*md));
1295
1296                 if (!tun_dst)
1297                         goto drop;
1298
1299                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1300         } else {
1301                 memset(md, 0, sizeof(*md));
1302         }
1303
1304         /* For backwards compatibility, only allow reserved fields to be
1305          * used by VXLAN extensions if explicitly requested.
1306          */
1307         if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1308                 struct vxlanhdr_gbp *gbp;
1309
1310                 gbp = (struct vxlanhdr_gbp *)vxh;
1311                 md->gbp = ntohs(gbp->policy_id);
1312
1313                 if (tun_dst) {
1314                         tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1315                         tun_dst->u.tun_info.options_len = sizeof(*md);
1316                 }
1317
1318                 if (gbp->dont_learn)
1319                         md->gbp |= VXLAN_GBP_DONT_LEARN;
1320
1321                 if (gbp->policy_applied)
1322                         md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1323
1324                 flags &= ~VXLAN_GBP_USED_BITS;
1325         }
1326
1327         if (flags || vni & ~VXLAN_VNI_MASK) {
1328                 /* If there are any unprocessed flags remaining treat
1329                  * this as a malformed packet. This behavior diverges from
1330                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1331                  * in reserved fields are to be ignored. The approach here
1332                  * maintains compatibility with previous stack code, and also
1333                  * is more robust and provides a little more security in
1334                  * adding extensions to VXLAN.
1335                  */
1336
1337                 goto bad_flags;
1338         }
1339
1340         vxlan_rcv(vs, skb, md, vni >> 8, tun_dst);
1341         return 0;
1342
1343 drop:
1344         /* Consume bad packet */
1345         kfree_skb(skb);
1346         return 0;
1347
1348 bad_flags:
1349         netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1350                    ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1351         goto drop;
1352 }
1353
1354 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1355 {
1356         struct vxlan_dev *vxlan = netdev_priv(dev);
1357         struct arphdr *parp;
1358         u8 *arpptr, *sha;
1359         __be32 sip, tip;
1360         struct neighbour *n;
1361
1362         if (dev->flags & IFF_NOARP)
1363                 goto out;
1364
1365         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1366                 dev->stats.tx_dropped++;
1367                 goto out;
1368         }
1369         parp = arp_hdr(skb);
1370
1371         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1372              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1373             parp->ar_pro != htons(ETH_P_IP) ||
1374             parp->ar_op != htons(ARPOP_REQUEST) ||
1375             parp->ar_hln != dev->addr_len ||
1376             parp->ar_pln != 4)
1377                 goto out;
1378         arpptr = (u8 *)parp + sizeof(struct arphdr);
1379         sha = arpptr;
1380         arpptr += dev->addr_len;        /* sha */
1381         memcpy(&sip, arpptr, sizeof(sip));
1382         arpptr += sizeof(sip);
1383         arpptr += dev->addr_len;        /* tha */
1384         memcpy(&tip, arpptr, sizeof(tip));
1385
1386         if (ipv4_is_loopback(tip) ||
1387             ipv4_is_multicast(tip))
1388                 goto out;
1389
1390         n = neigh_lookup(&arp_tbl, &tip, dev);
1391
1392         if (n) {
1393                 struct vxlan_fdb *f;
1394                 struct sk_buff  *reply;
1395
1396                 if (!(n->nud_state & NUD_CONNECTED)) {
1397                         neigh_release(n);
1398                         goto out;
1399                 }
1400
1401                 f = vxlan_find_mac(vxlan, n->ha);
1402                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1403                         /* bridge-local neighbor */
1404                         neigh_release(n);
1405                         goto out;
1406                 }
1407
1408                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1409                                 n->ha, sha);
1410
1411                 neigh_release(n);
1412
1413                 if (reply == NULL)
1414                         goto out;
1415
1416                 skb_reset_mac_header(reply);
1417                 __skb_pull(reply, skb_network_offset(reply));
1418                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1419                 reply->pkt_type = PACKET_HOST;
1420
1421                 if (netif_rx_ni(reply) == NET_RX_DROP)
1422                         dev->stats.rx_dropped++;
1423         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1424                 union vxlan_addr ipa = {
1425                         .sin.sin_addr.s_addr = tip,
1426                         .sin.sin_family = AF_INET,
1427                 };
1428
1429                 vxlan_ip_miss(dev, &ipa);
1430         }
1431 out:
1432         consume_skb(skb);
1433         return NETDEV_TX_OK;
1434 }
1435
1436 #if IS_ENABLED(CONFIG_IPV6)
1437 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1438         struct neighbour *n, bool isrouter)
1439 {
1440         struct net_device *dev = request->dev;
1441         struct sk_buff *reply;
1442         struct nd_msg *ns, *na;
1443         struct ipv6hdr *pip6;
1444         u8 *daddr;
1445         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1446         int ns_olen;
1447         int i, len;
1448
1449         if (dev == NULL)
1450                 return NULL;
1451
1452         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1453                 sizeof(*na) + na_olen + dev->needed_tailroom;
1454         reply = alloc_skb(len, GFP_ATOMIC);
1455         if (reply == NULL)
1456                 return NULL;
1457
1458         reply->protocol = htons(ETH_P_IPV6);
1459         reply->dev = dev;
1460         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1461         skb_push(reply, sizeof(struct ethhdr));
1462         skb_set_mac_header(reply, 0);
1463
1464         ns = (struct nd_msg *)skb_transport_header(request);
1465
1466         daddr = eth_hdr(request)->h_source;
1467         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1468         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1469                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1470                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1471                         break;
1472                 }
1473         }
1474
1475         /* Ethernet header */
1476         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1477         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1478         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1479         reply->protocol = htons(ETH_P_IPV6);
1480
1481         skb_pull(reply, sizeof(struct ethhdr));
1482         skb_set_network_header(reply, 0);
1483         skb_put(reply, sizeof(struct ipv6hdr));
1484
1485         /* IPv6 header */
1486
1487         pip6 = ipv6_hdr(reply);
1488         memset(pip6, 0, sizeof(struct ipv6hdr));
1489         pip6->version = 6;
1490         pip6->priority = ipv6_hdr(request)->priority;
1491         pip6->nexthdr = IPPROTO_ICMPV6;
1492         pip6->hop_limit = 255;
1493         pip6->daddr = ipv6_hdr(request)->saddr;
1494         pip6->saddr = *(struct in6_addr *)n->primary_key;
1495
1496         skb_pull(reply, sizeof(struct ipv6hdr));
1497         skb_set_transport_header(reply, 0);
1498
1499         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1500
1501         /* Neighbor Advertisement */
1502         memset(na, 0, sizeof(*na)+na_olen);
1503         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1504         na->icmph.icmp6_router = isrouter;
1505         na->icmph.icmp6_override = 1;
1506         na->icmph.icmp6_solicited = 1;
1507         na->target = ns->target;
1508         ether_addr_copy(&na->opt[2], n->ha);
1509         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1510         na->opt[1] = na_olen >> 3;
1511
1512         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1513                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1514                 csum_partial(na, sizeof(*na)+na_olen, 0));
1515
1516         pip6->payload_len = htons(sizeof(*na)+na_olen);
1517
1518         skb_push(reply, sizeof(struct ipv6hdr));
1519
1520         reply->ip_summed = CHECKSUM_UNNECESSARY;
1521
1522         return reply;
1523 }
1524
1525 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1526 {
1527         struct vxlan_dev *vxlan = netdev_priv(dev);
1528         struct nd_msg *msg;
1529         const struct ipv6hdr *iphdr;
1530         const struct in6_addr *saddr, *daddr;
1531         struct neighbour *n;
1532         struct inet6_dev *in6_dev;
1533
1534         in6_dev = __in6_dev_get(dev);
1535         if (!in6_dev)
1536                 goto out;
1537
1538         iphdr = ipv6_hdr(skb);
1539         saddr = &iphdr->saddr;
1540         daddr = &iphdr->daddr;
1541
1542         msg = (struct nd_msg *)skb_transport_header(skb);
1543         if (msg->icmph.icmp6_code != 0 ||
1544             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1545                 goto out;
1546
1547         if (ipv6_addr_loopback(daddr) ||
1548             ipv6_addr_is_multicast(&msg->target))
1549                 goto out;
1550
1551         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1552
1553         if (n) {
1554                 struct vxlan_fdb *f;
1555                 struct sk_buff *reply;
1556
1557                 if (!(n->nud_state & NUD_CONNECTED)) {
1558                         neigh_release(n);
1559                         goto out;
1560                 }
1561
1562                 f = vxlan_find_mac(vxlan, n->ha);
1563                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1564                         /* bridge-local neighbor */
1565                         neigh_release(n);
1566                         goto out;
1567                 }
1568
1569                 reply = vxlan_na_create(skb, n,
1570                                         !!(f ? f->flags & NTF_ROUTER : 0));
1571
1572                 neigh_release(n);
1573
1574                 if (reply == NULL)
1575                         goto out;
1576
1577                 if (netif_rx_ni(reply) == NET_RX_DROP)
1578                         dev->stats.rx_dropped++;
1579
1580         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1581                 union vxlan_addr ipa = {
1582                         .sin6.sin6_addr = msg->target,
1583                         .sin6.sin6_family = AF_INET6,
1584                 };
1585
1586                 vxlan_ip_miss(dev, &ipa);
1587         }
1588
1589 out:
1590         consume_skb(skb);
1591         return NETDEV_TX_OK;
1592 }
1593 #endif
1594
1595 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1596 {
1597         struct vxlan_dev *vxlan = netdev_priv(dev);
1598         struct neighbour *n;
1599
1600         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1601                 return false;
1602
1603         n = NULL;
1604         switch (ntohs(eth_hdr(skb)->h_proto)) {
1605         case ETH_P_IP:
1606         {
1607                 struct iphdr *pip;
1608
1609                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1610                         return false;
1611                 pip = ip_hdr(skb);
1612                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1613                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1614                         union vxlan_addr ipa = {
1615                                 .sin.sin_addr.s_addr = pip->daddr,
1616                                 .sin.sin_family = AF_INET,
1617                         };
1618
1619                         vxlan_ip_miss(dev, &ipa);
1620                         return false;
1621                 }
1622
1623                 break;
1624         }
1625 #if IS_ENABLED(CONFIG_IPV6)
1626         case ETH_P_IPV6:
1627         {
1628                 struct ipv6hdr *pip6;
1629
1630                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1631                         return false;
1632                 pip6 = ipv6_hdr(skb);
1633                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1634                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1635                         union vxlan_addr ipa = {
1636                                 .sin6.sin6_addr = pip6->daddr,
1637                                 .sin6.sin6_family = AF_INET6,
1638                         };
1639
1640                         vxlan_ip_miss(dev, &ipa);
1641                         return false;
1642                 }
1643
1644                 break;
1645         }
1646 #endif
1647         default:
1648                 return false;
1649         }
1650
1651         if (n) {
1652                 bool diff;
1653
1654                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1655                 if (diff) {
1656                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1657                                 dev->addr_len);
1658                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1659                 }
1660                 neigh_release(n);
1661                 return diff;
1662         }
1663
1664         return false;
1665 }
1666
1667 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1668                                 struct vxlan_metadata *md)
1669 {
1670         struct vxlanhdr_gbp *gbp;
1671
1672         if (!md->gbp)
1673                 return;
1674
1675         gbp = (struct vxlanhdr_gbp *)vxh;
1676         vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1677
1678         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1679                 gbp->dont_learn = 1;
1680
1681         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1682                 gbp->policy_applied = 1;
1683
1684         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1685 }
1686
1687 #if IS_ENABLED(CONFIG_IPV6)
1688 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1689                            struct sk_buff *skb,
1690                            struct net_device *dev, struct in6_addr *saddr,
1691                            struct in6_addr *daddr, __u8 prio, __u8 ttl,
1692                            __be16 src_port, __be16 dst_port, __be32 vni,
1693                            struct vxlan_metadata *md, bool xnet, u32 vxflags)
1694 {
1695         struct vxlanhdr *vxh;
1696         int min_headroom;
1697         int err;
1698         bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1699         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1700         u16 hdrlen = sizeof(struct vxlanhdr);
1701
1702         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1703             skb->ip_summed == CHECKSUM_PARTIAL) {
1704                 int csum_start = skb_checksum_start_offset(skb);
1705
1706                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1707                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1708                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1709                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1710                         udp_sum = false;
1711                         type |= SKB_GSO_TUNNEL_REMCSUM;
1712                 }
1713         }
1714
1715         skb_scrub_packet(skb, xnet);
1716
1717         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1718                         + VXLAN_HLEN + sizeof(struct ipv6hdr)
1719                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1720
1721         /* Need space for new headers (invalidates iph ptr) */
1722         err = skb_cow_head(skb, min_headroom);
1723         if (unlikely(err)) {
1724                 kfree_skb(skb);
1725                 goto err;
1726         }
1727
1728         skb = vlan_hwaccel_push_inside(skb);
1729         if (WARN_ON(!skb)) {
1730                 err = -ENOMEM;
1731                 goto err;
1732         }
1733
1734         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1735         if (IS_ERR(skb)) {
1736                 err = -EINVAL;
1737                 goto err;
1738         }
1739
1740         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1741         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1742         vxh->vx_vni = vni;
1743
1744         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1745                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1746                            VXLAN_RCO_SHIFT;
1747
1748                 if (skb->csum_offset == offsetof(struct udphdr, check))
1749                         data |= VXLAN_RCO_UDP;
1750
1751                 vxh->vx_vni |= htonl(data);
1752                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1753
1754                 if (!skb_is_gso(skb)) {
1755                         skb->ip_summed = CHECKSUM_NONE;
1756                         skb->encapsulation = 0;
1757                 }
1758         }
1759
1760         if (vxflags & VXLAN_F_GBP)
1761                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1762
1763         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1764
1765         udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1766                              ttl, src_port, dst_port,
1767                              !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1768         return 0;
1769 err:
1770         dst_release(dst);
1771         return err;
1772 }
1773 #endif
1774
1775 static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
1776                           __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1777                           __be16 src_port, __be16 dst_port, __be32 vni,
1778                           struct vxlan_metadata *md, bool xnet, u32 vxflags)
1779 {
1780         struct vxlanhdr *vxh;
1781         int min_headroom;
1782         int err;
1783         bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1784         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1785         u16 hdrlen = sizeof(struct vxlanhdr);
1786
1787         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1788             skb->ip_summed == CHECKSUM_PARTIAL) {
1789                 int csum_start = skb_checksum_start_offset(skb);
1790
1791                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1792                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1793                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1794                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1795                         udp_sum = false;
1796                         type |= SKB_GSO_TUNNEL_REMCSUM;
1797                 }
1798         }
1799
1800         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1801                         + VXLAN_HLEN + sizeof(struct iphdr)
1802                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1803
1804         /* Need space for new headers (invalidates iph ptr) */
1805         err = skb_cow_head(skb, min_headroom);
1806         if (unlikely(err)) {
1807                 kfree_skb(skb);
1808                 return err;
1809         }
1810
1811         skb = vlan_hwaccel_push_inside(skb);
1812         if (WARN_ON(!skb))
1813                 return -ENOMEM;
1814
1815         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1816         if (IS_ERR(skb))
1817                 return PTR_ERR(skb);
1818
1819         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1820         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1821         vxh->vx_vni = vni;
1822
1823         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1824                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1825                            VXLAN_RCO_SHIFT;
1826
1827                 if (skb->csum_offset == offsetof(struct udphdr, check))
1828                         data |= VXLAN_RCO_UDP;
1829
1830                 vxh->vx_vni |= htonl(data);
1831                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1832
1833                 if (!skb_is_gso(skb)) {
1834                         skb->ip_summed = CHECKSUM_NONE;
1835                         skb->encapsulation = 0;
1836                 }
1837         }
1838
1839         if (vxflags & VXLAN_F_GBP)
1840                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1841
1842         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1843
1844         return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
1845                                    ttl, df, src_port, dst_port, xnet,
1846                                    !(vxflags & VXLAN_F_UDP_CSUM));
1847 }
1848
1849 #if IS_ENABLED(CONFIG_IPV6)
1850 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1851                                           struct sk_buff *skb, int oif,
1852                                           const struct in6_addr *daddr,
1853                                           struct in6_addr *saddr)
1854 {
1855         struct dst_entry *ndst;
1856         struct flowi6 fl6;
1857         int err;
1858
1859         memset(&fl6, 0, sizeof(fl6));
1860         fl6.flowi6_oif = oif;
1861         fl6.daddr = *daddr;
1862         fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1863         fl6.flowi6_mark = skb->mark;
1864         fl6.flowi6_proto = IPPROTO_UDP;
1865
1866         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1867                                          vxlan->vn6_sock->sock->sk,
1868                                          &ndst, &fl6);
1869         if (err < 0)
1870                 return ERR_PTR(err);
1871
1872         *saddr = fl6.saddr;
1873         return ndst;
1874 }
1875 #endif
1876
1877 /* Bypass encapsulation if the destination is local */
1878 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1879                                struct vxlan_dev *dst_vxlan)
1880 {
1881         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1882         union vxlan_addr loopback;
1883         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1884         struct net_device *dev;
1885         int len = skb->len;
1886
1887         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1888         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1889         skb->pkt_type = PACKET_HOST;
1890         skb->encapsulation = 0;
1891         skb->dev = dst_vxlan->dev;
1892         __skb_pull(skb, skb_network_offset(skb));
1893
1894         if (remote_ip->sa.sa_family == AF_INET) {
1895                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1896                 loopback.sa.sa_family =  AF_INET;
1897 #if IS_ENABLED(CONFIG_IPV6)
1898         } else {
1899                 loopback.sin6.sin6_addr = in6addr_loopback;
1900                 loopback.sa.sa_family =  AF_INET6;
1901 #endif
1902         }
1903
1904         rcu_read_lock();
1905         dev = skb->dev;
1906         if (unlikely(!(dev->flags & IFF_UP))) {
1907                 kfree_skb(skb);
1908                 goto drop;
1909         }
1910
1911         if (dst_vxlan->flags & VXLAN_F_LEARN)
1912                 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source);
1913
1914         u64_stats_update_begin(&tx_stats->syncp);
1915         tx_stats->tx_packets++;
1916         tx_stats->tx_bytes += len;
1917         u64_stats_update_end(&tx_stats->syncp);
1918
1919         if (netif_rx(skb) == NET_RX_SUCCESS) {
1920                 u64_stats_update_begin(&rx_stats->syncp);
1921                 rx_stats->rx_packets++;
1922                 rx_stats->rx_bytes += len;
1923                 u64_stats_update_end(&rx_stats->syncp);
1924         } else {
1925 drop:
1926                 dev->stats.rx_dropped++;
1927         }
1928         rcu_read_unlock();
1929 }
1930
1931 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1932                            struct vxlan_rdst *rdst, bool did_rsc)
1933 {
1934         struct ip_tunnel_info *info;
1935         struct vxlan_dev *vxlan = netdev_priv(dev);
1936         struct sock *sk;
1937         struct rtable *rt = NULL;
1938         const struct iphdr *old_iph;
1939         struct flowi4 fl4;
1940         union vxlan_addr *dst;
1941         union vxlan_addr remote_ip;
1942         struct vxlan_metadata _md;
1943         struct vxlan_metadata *md = &_md;
1944         __be16 src_port = 0, dst_port;
1945         u32 vni;
1946         __be16 df = 0;
1947         __u8 tos, ttl;
1948         int err;
1949         u32 flags = vxlan->flags;
1950
1951         info = skb_tunnel_info(skb);
1952
1953         if (rdst) {
1954                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1955                 vni = rdst->remote_vni;
1956                 dst = &rdst->remote_ip;
1957         } else {
1958                 if (!info) {
1959                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1960                                   dev->name);
1961                         goto drop;
1962                 }
1963                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1964                 vni = be64_to_cpu(info->key.tun_id);
1965                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1966                 if (remote_ip.sa.sa_family == AF_INET)
1967                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1968                 else
1969                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1970                 dst = &remote_ip;
1971         }
1972
1973         if (vxlan_addr_any(dst)) {
1974                 if (did_rsc) {
1975                         /* short-circuited back to local bridge */
1976                         vxlan_encap_bypass(skb, vxlan, vxlan);
1977                         return;
1978                 }
1979                 goto drop;
1980         }
1981
1982         old_iph = ip_hdr(skb);
1983
1984         ttl = vxlan->cfg.ttl;
1985         if (!ttl && vxlan_addr_multicast(dst))
1986                 ttl = 1;
1987
1988         tos = vxlan->cfg.tos;
1989         if (tos == 1)
1990                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1991
1992         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1993                                      vxlan->cfg.port_max, true);
1994
1995         if (info) {
1996                 ttl = info->key.ttl;
1997                 tos = info->key.tos;
1998
1999                 if (info->options_len)
2000                         md = ip_tunnel_info_opts(info);
2001         } else {
2002                 md->gbp = skb->mark;
2003         }
2004
2005         if (dst->sa.sa_family == AF_INET) {
2006                 if (!vxlan->vn4_sock)
2007                         goto drop;
2008                 sk = vxlan->vn4_sock->sock->sk;
2009
2010                 if (info) {
2011                         if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2012                                 df = htons(IP_DF);
2013
2014                         if (info->key.tun_flags & TUNNEL_CSUM)
2015                                 flags |= VXLAN_F_UDP_CSUM;
2016                         else
2017                                 flags &= ~VXLAN_F_UDP_CSUM;
2018                 }
2019
2020                 memset(&fl4, 0, sizeof(fl4));
2021                 fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
2022                 fl4.flowi4_tos = RT_TOS(tos);
2023                 fl4.flowi4_mark = skb->mark;
2024                 fl4.flowi4_proto = IPPROTO_UDP;
2025                 fl4.daddr = dst->sin.sin_addr.s_addr;
2026                 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
2027
2028                 rt = ip_route_output_key(vxlan->net, &fl4);
2029                 if (IS_ERR(rt)) {
2030                         netdev_dbg(dev, "no route to %pI4\n",
2031                                    &dst->sin.sin_addr.s_addr);
2032                         dev->stats.tx_carrier_errors++;
2033                         goto tx_error;
2034                 }
2035
2036                 if (rt->dst.dev == dev) {
2037                         netdev_dbg(dev, "circular route to %pI4\n",
2038                                    &dst->sin.sin_addr.s_addr);
2039                         dev->stats.collisions++;
2040                         goto rt_tx_error;
2041                 }
2042
2043                 /* Bypass encapsulation if the destination is local */
2044                 if (rt->rt_flags & RTCF_LOCAL &&
2045                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2046                         struct vxlan_dev *dst_vxlan;
2047
2048                         ip_rt_put(rt);
2049                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2050                                                    dst->sa.sa_family, dst_port,
2051                                                    vxlan->flags);
2052                         if (!dst_vxlan)
2053                                 goto tx_error;
2054                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2055                         return;
2056                 }
2057
2058                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2059                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2060                 err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
2061                                      dst->sin.sin_addr.s_addr, tos, ttl, df,
2062                                      src_port, dst_port, htonl(vni << 8), md,
2063                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
2064                                      flags);
2065                 if (err < 0) {
2066                         /* skb is already freed. */
2067                         skb = NULL;
2068                         goto rt_tx_error;
2069                 }
2070
2071                 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
2072 #if IS_ENABLED(CONFIG_IPV6)
2073         } else {
2074                 struct dst_entry *ndst;
2075                 struct in6_addr saddr;
2076                 u32 rt6i_flags;
2077
2078                 if (!vxlan->vn6_sock)
2079                         goto drop;
2080                 sk = vxlan->vn6_sock->sock->sk;
2081
2082                 ndst = vxlan6_get_route(vxlan, skb,
2083                                         rdst ? rdst->remote_ifindex : 0,
2084                                         &dst->sin6.sin6_addr, &saddr);
2085                 if (IS_ERR(ndst)) {
2086                         netdev_dbg(dev, "no route to %pI6\n",
2087                                    &dst->sin6.sin6_addr);
2088                         dev->stats.tx_carrier_errors++;
2089                         goto tx_error;
2090                 }
2091
2092                 if (ndst->dev == dev) {
2093                         netdev_dbg(dev, "circular route to %pI6\n",
2094                                    &dst->sin6.sin6_addr);
2095                         dst_release(ndst);
2096                         dev->stats.collisions++;
2097                         goto tx_error;
2098                 }
2099
2100                 /* Bypass encapsulation if the destination is local */
2101                 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2102                 if (rt6i_flags & RTF_LOCAL &&
2103                     !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2104                         struct vxlan_dev *dst_vxlan;
2105
2106                         dst_release(ndst);
2107                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2108                                                    dst->sa.sa_family, dst_port,
2109                                                    vxlan->flags);
2110                         if (!dst_vxlan)
2111                                 goto tx_error;
2112                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2113                         return;
2114                 }
2115
2116                 if (info) {
2117                         if (info->key.tun_flags & TUNNEL_CSUM)
2118                                 flags &= ~VXLAN_F_UDP_ZERO_CSUM6_TX;
2119                         else
2120                                 flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2121                 }
2122
2123                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2124                 err = vxlan6_xmit_skb(ndst, sk, skb, dev, &saddr, &dst->sin6.sin6_addr,
2125                                       0, ttl, src_port, dst_port, htonl(vni << 8), md,
2126                                       !net_eq(vxlan->net, dev_net(vxlan->dev)),
2127                                       flags);
2128 #endif
2129         }
2130
2131         return;
2132
2133 drop:
2134         dev->stats.tx_dropped++;
2135         goto tx_free;
2136
2137 rt_tx_error:
2138         ip_rt_put(rt);
2139 tx_error:
2140         dev->stats.tx_errors++;
2141 tx_free:
2142         dev_kfree_skb(skb);
2143 }
2144
2145 /* Transmit local packets over Vxlan
2146  *
2147  * Outer IP header inherits ECN and DF from inner header.
2148  * Outer UDP destination is the VXLAN assigned port.
2149  *           source port is based on hash of flow
2150  */
2151 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2152 {
2153         struct vxlan_dev *vxlan = netdev_priv(dev);
2154         const struct ip_tunnel_info *info;
2155         struct ethhdr *eth;
2156         bool did_rsc = false;
2157         struct vxlan_rdst *rdst, *fdst = NULL;
2158         struct vxlan_fdb *f;
2159
2160         info = skb_tunnel_info(skb);
2161
2162         skb_reset_mac_header(skb);
2163         eth = eth_hdr(skb);
2164
2165         if ((vxlan->flags & VXLAN_F_PROXY)) {
2166                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2167                         return arp_reduce(dev, skb);
2168 #if IS_ENABLED(CONFIG_IPV6)
2169                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2170                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2171                                        + sizeof(struct nd_msg)) &&
2172                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2173                                 struct nd_msg *msg;
2174
2175                                 msg = (struct nd_msg *)skb_transport_header(skb);
2176                                 if (msg->icmph.icmp6_code == 0 &&
2177                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2178                                         return neigh_reduce(dev, skb);
2179                 }
2180                 eth = eth_hdr(skb);
2181 #endif
2182         }
2183
2184         if (vxlan->flags & VXLAN_F_COLLECT_METADATA &&
2185             info && info->mode & IP_TUNNEL_INFO_TX) {
2186                 vxlan_xmit_one(skb, dev, NULL, false);
2187                 return NETDEV_TX_OK;
2188         }
2189
2190         f = vxlan_find_mac(vxlan, eth->h_dest);
2191         did_rsc = false;
2192
2193         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2194             (ntohs(eth->h_proto) == ETH_P_IP ||
2195              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2196                 did_rsc = route_shortcircuit(dev, skb);
2197                 if (did_rsc)
2198                         f = vxlan_find_mac(vxlan, eth->h_dest);
2199         }
2200
2201         if (f == NULL) {
2202                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2203                 if (f == NULL) {
2204                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2205                             !is_multicast_ether_addr(eth->h_dest))
2206                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2207
2208                         dev->stats.tx_dropped++;
2209                         kfree_skb(skb);
2210                         return NETDEV_TX_OK;
2211                 }
2212         }
2213
2214         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2215                 struct sk_buff *skb1;
2216
2217                 if (!fdst) {
2218                         fdst = rdst;
2219                         continue;
2220                 }
2221                 skb1 = skb_clone(skb, GFP_ATOMIC);
2222                 if (skb1)
2223                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2224         }
2225
2226         if (fdst)
2227                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2228         else
2229                 kfree_skb(skb);
2230         return NETDEV_TX_OK;
2231 }
2232
2233 /* Walk the forwarding table and purge stale entries */
2234 static void vxlan_cleanup(unsigned long arg)
2235 {
2236         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2237         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2238         unsigned int h;
2239
2240         if (!netif_running(vxlan->dev))
2241                 return;
2242
2243         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2244                 struct hlist_node *p, *n;
2245
2246                 spin_lock_bh(&vxlan->hash_lock);
2247                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2248                         struct vxlan_fdb *f
2249                                 = container_of(p, struct vxlan_fdb, hlist);
2250                         unsigned long timeout;
2251
2252                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2253                                 continue;
2254
2255                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2256                         if (time_before_eq(timeout, jiffies)) {
2257                                 netdev_dbg(vxlan->dev,
2258                                            "garbage collect %pM\n",
2259                                            f->eth_addr);
2260                                 f->state = NUD_STALE;
2261                                 vxlan_fdb_destroy(vxlan, f);
2262                         } else if (time_before(timeout, next_timer))
2263                                 next_timer = timeout;
2264                 }
2265                 spin_unlock_bh(&vxlan->hash_lock);
2266         }
2267
2268         mod_timer(&vxlan->age_timer, next_timer);
2269 }
2270
2271 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2272 {
2273         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2274
2275         spin_lock(&vn->sock_lock);
2276         hlist_del_init_rcu(&vxlan->hlist);
2277         spin_unlock(&vn->sock_lock);
2278 }
2279
2280 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2281 {
2282         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2283         __u32 vni = vxlan->default_dst.remote_vni;
2284
2285         spin_lock(&vn->sock_lock);
2286         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2287         spin_unlock(&vn->sock_lock);
2288 }
2289
2290 /* Setup stats when device is created */
2291 static int vxlan_init(struct net_device *dev)
2292 {
2293         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2294         if (!dev->tstats)
2295                 return -ENOMEM;
2296
2297         return 0;
2298 }
2299
2300 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2301 {
2302         struct vxlan_fdb *f;
2303
2304         spin_lock_bh(&vxlan->hash_lock);
2305         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2306         if (f)
2307                 vxlan_fdb_destroy(vxlan, f);
2308         spin_unlock_bh(&vxlan->hash_lock);
2309 }
2310
2311 static void vxlan_uninit(struct net_device *dev)
2312 {
2313         struct vxlan_dev *vxlan = netdev_priv(dev);
2314
2315         vxlan_fdb_delete_default(vxlan);
2316
2317         free_percpu(dev->tstats);
2318 }
2319
2320 /* Start ageing timer and join group when device is brought up */
2321 static int vxlan_open(struct net_device *dev)
2322 {
2323         struct vxlan_dev *vxlan = netdev_priv(dev);
2324         int ret;
2325
2326         ret = vxlan_sock_add(vxlan);
2327         if (ret < 0)
2328                 return ret;
2329
2330         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2331                 ret = vxlan_igmp_join(vxlan);
2332                 if (ret == -EADDRINUSE)
2333                         ret = 0;
2334                 if (ret) {
2335                         vxlan_sock_release(vxlan);
2336                         return ret;
2337                 }
2338         }
2339
2340         if (vxlan->cfg.age_interval)
2341                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2342
2343         return ret;
2344 }
2345
2346 /* Purge the forwarding table */
2347 static void vxlan_flush(struct vxlan_dev *vxlan)
2348 {
2349         unsigned int h;
2350
2351         spin_lock_bh(&vxlan->hash_lock);
2352         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2353                 struct hlist_node *p, *n;
2354                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2355                         struct vxlan_fdb *f
2356                                 = container_of(p, struct vxlan_fdb, hlist);
2357                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2358                         if (!is_zero_ether_addr(f->eth_addr))
2359                                 vxlan_fdb_destroy(vxlan, f);
2360                 }
2361         }
2362         spin_unlock_bh(&vxlan->hash_lock);
2363 }
2364
2365 /* Cleanup timer and forwarding table on shutdown */
2366 static int vxlan_stop(struct net_device *dev)
2367 {
2368         struct vxlan_dev *vxlan = netdev_priv(dev);
2369         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2370         int ret = 0;
2371
2372         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2373             !vxlan_group_used(vn, vxlan))
2374                 ret = vxlan_igmp_leave(vxlan);
2375
2376         del_timer_sync(&vxlan->age_timer);
2377
2378         vxlan_flush(vxlan);
2379         vxlan_sock_release(vxlan);
2380
2381         return ret;
2382 }
2383
2384 /* Stub, nothing needs to be done. */
2385 static void vxlan_set_multicast_list(struct net_device *dev)
2386 {
2387 }
2388
2389 static int __vxlan_change_mtu(struct net_device *dev,
2390                               struct net_device *lowerdev,
2391                               struct vxlan_rdst *dst, int new_mtu, bool strict)
2392 {
2393         int max_mtu = IP_MAX_MTU;
2394
2395         if (lowerdev)
2396                 max_mtu = lowerdev->mtu;
2397
2398         if (dst->remote_ip.sa.sa_family == AF_INET6)
2399                 max_mtu -= VXLAN6_HEADROOM;
2400         else
2401                 max_mtu -= VXLAN_HEADROOM;
2402
2403         if (new_mtu < 68)
2404                 return -EINVAL;
2405
2406         if (new_mtu > max_mtu) {
2407                 if (strict)
2408                         return -EINVAL;
2409
2410                 new_mtu = max_mtu;
2411         }
2412
2413         dev->mtu = new_mtu;
2414         return 0;
2415 }
2416
2417 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2418 {
2419         struct vxlan_dev *vxlan = netdev_priv(dev);
2420         struct vxlan_rdst *dst = &vxlan->default_dst;
2421         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2422                                                          dst->remote_ifindex);
2423         return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2424 }
2425
2426 static int egress_ipv4_tun_info(struct net_device *dev, struct sk_buff *skb,
2427                                 struct ip_tunnel_info *info,
2428                                 __be16 sport, __be16 dport)
2429 {
2430         struct vxlan_dev *vxlan = netdev_priv(dev);
2431         struct rtable *rt;
2432         struct flowi4 fl4;
2433
2434         memset(&fl4, 0, sizeof(fl4));
2435         fl4.flowi4_tos = RT_TOS(info->key.tos);
2436         fl4.flowi4_mark = skb->mark;
2437         fl4.flowi4_proto = IPPROTO_UDP;
2438         fl4.daddr = info->key.u.ipv4.dst;
2439
2440         rt = ip_route_output_key(vxlan->net, &fl4);
2441         if (IS_ERR(rt))
2442                 return PTR_ERR(rt);
2443         ip_rt_put(rt);
2444
2445         info->key.u.ipv4.src = fl4.saddr;
2446         info->key.tp_src = sport;
2447         info->key.tp_dst = dport;
2448         return 0;
2449 }
2450
2451 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2452 {
2453         struct vxlan_dev *vxlan = netdev_priv(dev);
2454         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2455         __be16 sport, dport;
2456
2457         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2458                                   vxlan->cfg.port_max, true);
2459         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2460
2461         if (ip_tunnel_info_af(info) == AF_INET) {
2462                 if (!vxlan->vn4_sock)
2463                         return -EINVAL;
2464                 return egress_ipv4_tun_info(dev, skb, info, sport, dport);
2465         } else {
2466 #if IS_ENABLED(CONFIG_IPV6)
2467                 struct dst_entry *ndst;
2468
2469                 if (!vxlan->vn6_sock)
2470                         return -EINVAL;
2471                 ndst = vxlan6_get_route(vxlan, skb, 0,
2472                                         &info->key.u.ipv6.dst,
2473                                         &info->key.u.ipv6.src);
2474                 if (IS_ERR(ndst))
2475                         return PTR_ERR(ndst);
2476                 dst_release(ndst);
2477
2478                 info->key.tp_src = sport;
2479                 info->key.tp_dst = dport;
2480 #else /* !CONFIG_IPV6 */
2481                 return -EPFNOSUPPORT;
2482 #endif
2483         }
2484         return 0;
2485 }
2486
2487 static const struct net_device_ops vxlan_netdev_ops = {
2488         .ndo_init               = vxlan_init,
2489         .ndo_uninit             = vxlan_uninit,
2490         .ndo_open               = vxlan_open,
2491         .ndo_stop               = vxlan_stop,
2492         .ndo_start_xmit         = vxlan_xmit,
2493         .ndo_get_stats64        = ip_tunnel_get_stats64,
2494         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2495         .ndo_change_mtu         = vxlan_change_mtu,
2496         .ndo_validate_addr      = eth_validate_addr,
2497         .ndo_set_mac_address    = eth_mac_addr,
2498         .ndo_fdb_add            = vxlan_fdb_add,
2499         .ndo_fdb_del            = vxlan_fdb_delete,
2500         .ndo_fdb_dump           = vxlan_fdb_dump,
2501         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2502 };
2503
2504 /* Info for udev, that this is a virtual tunnel endpoint */
2505 static struct device_type vxlan_type = {
2506         .name = "vxlan",
2507 };
2508
2509 /* Calls the ndo_add_vxlan_port of the caller in order to
2510  * supply the listening VXLAN udp ports. Callers are expected
2511  * to implement the ndo_add_vxlan_port.
2512  */
2513 void vxlan_get_rx_port(struct net_device *dev)
2514 {
2515         struct vxlan_sock *vs;
2516         struct net *net = dev_net(dev);
2517         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2518         sa_family_t sa_family;
2519         __be16 port;
2520         unsigned int i;
2521
2522         spin_lock(&vn->sock_lock);
2523         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2524                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2525                         port = inet_sk(vs->sock->sk)->inet_sport;
2526                         sa_family = vxlan_get_sk_family(vs);
2527                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2528                                                             port);
2529                 }
2530         }
2531         spin_unlock(&vn->sock_lock);
2532 }
2533 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2534
2535 /* Initialize the device structure. */
2536 static void vxlan_setup(struct net_device *dev)
2537 {
2538         struct vxlan_dev *vxlan = netdev_priv(dev);
2539         unsigned int h;
2540
2541         eth_hw_addr_random(dev);
2542         ether_setup(dev);
2543
2544         dev->netdev_ops = &vxlan_netdev_ops;
2545         dev->destructor = free_netdev;
2546         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2547
2548         dev->features   |= NETIF_F_LLTX;
2549         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2550         dev->features   |= NETIF_F_RXCSUM;
2551         dev->features   |= NETIF_F_GSO_SOFTWARE;
2552
2553         dev->vlan_features = dev->features;
2554         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2555         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2556         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2557         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2558         netif_keep_dst(dev);
2559         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2560
2561         INIT_LIST_HEAD(&vxlan->next);
2562         spin_lock_init(&vxlan->hash_lock);
2563
2564         init_timer_deferrable(&vxlan->age_timer);
2565         vxlan->age_timer.function = vxlan_cleanup;
2566         vxlan->age_timer.data = (unsigned long) vxlan;
2567
2568         vxlan->cfg.dst_port = htons(vxlan_port);
2569
2570         vxlan->dev = dev;
2571
2572         gro_cells_init(&vxlan->gro_cells, dev);
2573
2574         for (h = 0; h < FDB_HASH_SIZE; ++h)
2575                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2576 }
2577
2578 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2579         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2580         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2581         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2582         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2583         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2584         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2585         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2586         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2587         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2588         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2589         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2590         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2591         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2592         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2593         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2594         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2595         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2596         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2597         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2598         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2599         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2600         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2601         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2602         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2603         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2604 };
2605
2606 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2607 {
2608         if (tb[IFLA_ADDRESS]) {
2609                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2610                         pr_debug("invalid link address (not ethernet)\n");
2611                         return -EINVAL;
2612                 }
2613
2614                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2615                         pr_debug("invalid all zero ethernet address\n");
2616                         return -EADDRNOTAVAIL;
2617                 }
2618         }
2619
2620         if (!data)
2621                 return -EINVAL;
2622
2623         if (data[IFLA_VXLAN_ID]) {
2624                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2625                 if (id >= VXLAN_N_VID)
2626                         return -ERANGE;
2627         }
2628
2629         if (data[IFLA_VXLAN_PORT_RANGE]) {
2630                 const struct ifla_vxlan_port_range *p
2631                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2632
2633                 if (ntohs(p->high) < ntohs(p->low)) {
2634                         pr_debug("port range %u .. %u not valid\n",
2635                                  ntohs(p->low), ntohs(p->high));
2636                         return -EINVAL;
2637                 }
2638         }
2639
2640         return 0;
2641 }
2642
2643 static void vxlan_get_drvinfo(struct net_device *netdev,
2644                               struct ethtool_drvinfo *drvinfo)
2645 {
2646         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2647         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2648 }
2649
2650 static const struct ethtool_ops vxlan_ethtool_ops = {
2651         .get_drvinfo    = vxlan_get_drvinfo,
2652         .get_link       = ethtool_op_get_link,
2653 };
2654
2655 static void vxlan_del_work(struct work_struct *work)
2656 {
2657         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2658         udp_tunnel_sock_release(vs->sock);
2659         kfree_rcu(vs, rcu);
2660 }
2661
2662 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2663                                         __be16 port, u32 flags)
2664 {
2665         struct socket *sock;
2666         struct udp_port_cfg udp_conf;
2667         int err;
2668
2669         memset(&udp_conf, 0, sizeof(udp_conf));
2670
2671         if (ipv6) {
2672                 udp_conf.family = AF_INET6;
2673                 udp_conf.use_udp6_rx_checksums =
2674                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2675                 udp_conf.ipv6_v6only = 1;
2676         } else {
2677                 udp_conf.family = AF_INET;
2678         }
2679
2680         udp_conf.local_udp_port = port;
2681
2682         /* Open UDP socket */
2683         err = udp_sock_create(net, &udp_conf, &sock);
2684         if (err < 0)
2685                 return ERR_PTR(err);
2686
2687         return sock;
2688 }
2689
2690 /* Create new listen socket if needed */
2691 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2692                                               __be16 port, u32 flags)
2693 {
2694         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2695         struct vxlan_sock *vs;
2696         struct socket *sock;
2697         unsigned int h;
2698         struct udp_tunnel_sock_cfg tunnel_cfg;
2699
2700         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2701         if (!vs)
2702                 return ERR_PTR(-ENOMEM);
2703
2704         for (h = 0; h < VNI_HASH_SIZE; ++h)
2705                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2706
2707         INIT_WORK(&vs->del_work, vxlan_del_work);
2708
2709         sock = vxlan_create_sock(net, ipv6, port, flags);
2710         if (IS_ERR(sock)) {
2711                 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2712                         PTR_ERR(sock));
2713                 kfree(vs);
2714                 return ERR_CAST(sock);
2715         }
2716
2717         vs->sock = sock;
2718         atomic_set(&vs->refcnt, 1);
2719         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2720
2721         /* Initialize the vxlan udp offloads structure */
2722         vs->udp_offloads.port = port;
2723         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2724         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2725
2726         spin_lock(&vn->sock_lock);
2727         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2728         vxlan_notify_add_rx_port(vs);
2729         spin_unlock(&vn->sock_lock);
2730
2731         /* Mark socket as an encapsulation socket. */
2732         tunnel_cfg.sk_user_data = vs;
2733         tunnel_cfg.encap_type = 1;
2734         tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2735         tunnel_cfg.encap_destroy = NULL;
2736
2737         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2738
2739         return vs;
2740 }
2741
2742 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2743 {
2744         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2745         struct vxlan_sock *vs = NULL;
2746
2747         if (!vxlan->cfg.no_share) {
2748                 spin_lock(&vn->sock_lock);
2749                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2750                                      vxlan->cfg.dst_port, vxlan->flags);
2751                 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2752                         spin_unlock(&vn->sock_lock);
2753                         return -EBUSY;
2754                 }
2755                 spin_unlock(&vn->sock_lock);
2756         }
2757         if (!vs)
2758                 vs = vxlan_socket_create(vxlan->net, ipv6,
2759                                          vxlan->cfg.dst_port, vxlan->flags);
2760         if (IS_ERR(vs))
2761                 return PTR_ERR(vs);
2762 #if IS_ENABLED(CONFIG_IPV6)
2763         if (ipv6)
2764                 vxlan->vn6_sock = vs;
2765         else
2766 #endif
2767                 vxlan->vn4_sock = vs;
2768         vxlan_vs_add_dev(vs, vxlan);
2769         return 0;
2770 }
2771
2772 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2773 {
2774         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2775         bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2776         int ret = 0;
2777
2778         vxlan->vn4_sock = NULL;
2779 #if IS_ENABLED(CONFIG_IPV6)
2780         vxlan->vn6_sock = NULL;
2781         if (ipv6 || metadata)
2782                 ret = __vxlan_sock_add(vxlan, true);
2783 #endif
2784         if (!ret && (!ipv6 || metadata))
2785                 ret = __vxlan_sock_add(vxlan, false);
2786         if (ret < 0)
2787                 vxlan_sock_release(vxlan);
2788         return ret;
2789 }
2790
2791 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2792                                struct vxlan_config *conf)
2793 {
2794         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2795         struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2796         struct vxlan_rdst *dst = &vxlan->default_dst;
2797         unsigned short needed_headroom = ETH_HLEN;
2798         int err;
2799         bool use_ipv6 = false;
2800         __be16 default_port = vxlan->cfg.dst_port;
2801         struct net_device *lowerdev = NULL;
2802
2803         vxlan->net = src_net;
2804
2805         dst->remote_vni = conf->vni;
2806
2807         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2808
2809         /* Unless IPv6 is explicitly requested, assume IPv4 */
2810         if (!dst->remote_ip.sa.sa_family)
2811                 dst->remote_ip.sa.sa_family = AF_INET;
2812
2813         if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2814             vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2815                 if (!IS_ENABLED(CONFIG_IPV6))
2816                         return -EPFNOSUPPORT;
2817                 use_ipv6 = true;
2818                 vxlan->flags |= VXLAN_F_IPV6;
2819         }
2820
2821         if (conf->remote_ifindex) {
2822                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2823                 dst->remote_ifindex = conf->remote_ifindex;
2824
2825                 if (!lowerdev) {
2826                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2827                         return -ENODEV;
2828                 }
2829
2830 #if IS_ENABLED(CONFIG_IPV6)
2831                 if (use_ipv6) {
2832                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2833                         if (idev && idev->cnf.disable_ipv6) {
2834                                 pr_info("IPv6 is disabled via sysctl\n");
2835                                 return -EPERM;
2836                         }
2837                 }
2838 #endif
2839
2840                 if (!conf->mtu)
2841                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2842
2843                 needed_headroom = lowerdev->hard_header_len;
2844         }
2845
2846         if (lowerdev) {
2847                 dev->gso_max_size = lowerdev->gso_max_size;
2848                 dev->gso_max_segs = lowerdev->gso_max_segs;
2849         }
2850
2851         if (conf->mtu) {
2852                 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2853                 if (err)
2854                         return err;
2855         }
2856
2857         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2858                 needed_headroom += VXLAN6_HEADROOM;
2859         else
2860                 needed_headroom += VXLAN_HEADROOM;
2861         dev->needed_headroom = needed_headroom;
2862
2863         memcpy(&vxlan->cfg, conf, sizeof(*conf));
2864         if (!vxlan->cfg.dst_port)
2865                 vxlan->cfg.dst_port = default_port;
2866         vxlan->flags |= conf->flags;
2867
2868         if (!vxlan->cfg.age_interval)
2869                 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2870
2871         list_for_each_entry(tmp, &vn->vxlan_list, next) {
2872                 if (tmp->cfg.vni == conf->vni &&
2873                     (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2874                      tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2875                     tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2876                     (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2877                     (vxlan->flags & VXLAN_F_RCV_FLAGS))
2878                 return -EEXIST;
2879         }
2880
2881         dev->ethtool_ops = &vxlan_ethtool_ops;
2882
2883         /* create an fdb entry for a valid default destination */
2884         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2885                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2886                                        &vxlan->default_dst.remote_ip,
2887                                        NUD_REACHABLE|NUD_PERMANENT,
2888                                        NLM_F_EXCL|NLM_F_CREATE,
2889                                        vxlan->cfg.dst_port,
2890                                        vxlan->default_dst.remote_vni,
2891                                        vxlan->default_dst.remote_ifindex,
2892                                        NTF_SELF);
2893                 if (err)
2894                         return err;
2895         }
2896
2897         err = register_netdevice(dev);
2898         if (err) {
2899                 vxlan_fdb_delete_default(vxlan);
2900                 return err;
2901         }
2902
2903         list_add(&vxlan->next, &vn->vxlan_list);
2904
2905         return 0;
2906 }
2907
2908 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2909                                     u8 name_assign_type, struct vxlan_config *conf)
2910 {
2911         struct nlattr *tb[IFLA_MAX+1];
2912         struct net_device *dev;
2913         int err;
2914
2915         memset(&tb, 0, sizeof(tb));
2916
2917         dev = rtnl_create_link(net, name, name_assign_type,
2918                                &vxlan_link_ops, tb);
2919         if (IS_ERR(dev))
2920                 return dev;
2921
2922         err = vxlan_dev_configure(net, dev, conf);
2923         if (err < 0) {
2924                 free_netdev(dev);
2925                 return ERR_PTR(err);
2926         }
2927
2928         return dev;
2929 }
2930 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2931
2932 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2933                          struct nlattr *tb[], struct nlattr *data[])
2934 {
2935         struct vxlan_config conf;
2936         int err;
2937
2938         memset(&conf, 0, sizeof(conf));
2939
2940         if (data[IFLA_VXLAN_ID])
2941                 conf.vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2942
2943         if (data[IFLA_VXLAN_GROUP]) {
2944                 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2945         } else if (data[IFLA_VXLAN_GROUP6]) {
2946                 if (!IS_ENABLED(CONFIG_IPV6))
2947                         return -EPFNOSUPPORT;
2948
2949                 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2950                 conf.remote_ip.sa.sa_family = AF_INET6;
2951         }
2952
2953         if (data[IFLA_VXLAN_LOCAL]) {
2954                 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2955                 conf.saddr.sa.sa_family = AF_INET;
2956         } else if (data[IFLA_VXLAN_LOCAL6]) {
2957                 if (!IS_ENABLED(CONFIG_IPV6))
2958                         return -EPFNOSUPPORT;
2959
2960                 /* TODO: respect scope id */
2961                 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2962                 conf.saddr.sa.sa_family = AF_INET6;
2963         }
2964
2965         if (data[IFLA_VXLAN_LINK])
2966                 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2967
2968         if (data[IFLA_VXLAN_TOS])
2969                 conf.tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2970
2971         if (data[IFLA_VXLAN_TTL])
2972                 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2973
2974         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2975                 conf.flags |= VXLAN_F_LEARN;
2976
2977         if (data[IFLA_VXLAN_AGEING])
2978                 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2979
2980         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2981                 conf.flags |= VXLAN_F_PROXY;
2982
2983         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2984                 conf.flags |= VXLAN_F_RSC;
2985
2986         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2987                 conf.flags |= VXLAN_F_L2MISS;
2988
2989         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2990                 conf.flags |= VXLAN_F_L3MISS;
2991
2992         if (data[IFLA_VXLAN_LIMIT])
2993                 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2994
2995         if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2996             nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2997                 conf.flags |= VXLAN_F_COLLECT_METADATA;
2998
2999         if (data[IFLA_VXLAN_PORT_RANGE]) {
3000                 const struct ifla_vxlan_port_range *p
3001                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3002                 conf.port_min = ntohs(p->low);
3003                 conf.port_max = ntohs(p->high);
3004         }
3005
3006         if (data[IFLA_VXLAN_PORT])
3007                 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3008
3009         if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3010                 conf.flags |= VXLAN_F_UDP_CSUM;
3011
3012         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
3013             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3014                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3015
3016         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3017             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3018                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3019
3020         if (data[IFLA_VXLAN_REMCSUM_TX] &&
3021             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3022                 conf.flags |= VXLAN_F_REMCSUM_TX;
3023
3024         if (data[IFLA_VXLAN_REMCSUM_RX] &&
3025             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3026                 conf.flags |= VXLAN_F_REMCSUM_RX;
3027
3028         if (data[IFLA_VXLAN_GBP])
3029                 conf.flags |= VXLAN_F_GBP;
3030
3031         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3032                 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3033
3034         if (tb[IFLA_MTU])
3035                 conf.mtu = nla_get_u32(tb[IFLA_MTU]);
3036
3037         err = vxlan_dev_configure(src_net, dev, &conf);
3038         switch (err) {
3039         case -ENODEV:
3040                 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
3041                 break;
3042
3043         case -EPERM:
3044                 pr_info("IPv6 is disabled via sysctl\n");
3045                 break;
3046
3047         case -EEXIST:
3048                 pr_info("duplicate VNI %u\n", conf.vni);
3049                 break;
3050         }
3051
3052         return err;
3053 }
3054
3055 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3056 {
3057         struct vxlan_dev *vxlan = netdev_priv(dev);
3058
3059         gro_cells_destroy(&vxlan->gro_cells);
3060         list_del(&vxlan->next);
3061         unregister_netdevice_queue(dev, head);
3062 }
3063
3064 static size_t vxlan_get_size(const struct net_device *dev)
3065 {
3066
3067         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
3068                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3069                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3070                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3071                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3072                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3073                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3074                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3075                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3076                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3077                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3078                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3079                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3080                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3081                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3082                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3083                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3084                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3085                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3086                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3087                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3088                 0;
3089 }
3090
3091 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3092 {
3093         const struct vxlan_dev *vxlan = netdev_priv(dev);
3094         const struct vxlan_rdst *dst = &vxlan->default_dst;
3095         struct ifla_vxlan_port_range ports = {
3096                 .low =  htons(vxlan->cfg.port_min),
3097                 .high = htons(vxlan->cfg.port_max),
3098         };
3099
3100         if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
3101                 goto nla_put_failure;
3102
3103         if (!vxlan_addr_any(&dst->remote_ip)) {
3104                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3105                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3106                                             dst->remote_ip.sin.sin_addr.s_addr))
3107                                 goto nla_put_failure;
3108 #if IS_ENABLED(CONFIG_IPV6)
3109                 } else {
3110                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3111                                              &dst->remote_ip.sin6.sin6_addr))
3112                                 goto nla_put_failure;
3113 #endif
3114                 }
3115         }
3116
3117         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3118                 goto nla_put_failure;
3119
3120         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3121                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3122                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3123                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3124                                 goto nla_put_failure;
3125 #if IS_ENABLED(CONFIG_IPV6)
3126                 } else {
3127                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3128                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3129                                 goto nla_put_failure;
3130 #endif
3131                 }
3132         }
3133
3134         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3135             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3136             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3137                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
3138             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3139                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
3140             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3141             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3142                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3143             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3144                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3145             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3146                        !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3147             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3148             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3149             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3150             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3151                         !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
3152             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3153                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3154             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3155                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3156             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3157                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3158             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3159                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3160                 goto nla_put_failure;
3161
3162         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3163                 goto nla_put_failure;
3164
3165         if (vxlan->flags & VXLAN_F_GBP &&
3166             nla_put_flag(skb, IFLA_VXLAN_GBP))
3167                 goto nla_put_failure;
3168
3169         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3170             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3171                 goto nla_put_failure;
3172
3173         return 0;
3174
3175 nla_put_failure:
3176         return -EMSGSIZE;
3177 }
3178
3179 static struct net *vxlan_get_link_net(const struct net_device *dev)
3180 {
3181         struct vxlan_dev *vxlan = netdev_priv(dev);
3182
3183         return vxlan->net;
3184 }
3185
3186 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3187         .kind           = "vxlan",
3188         .maxtype        = IFLA_VXLAN_MAX,
3189         .policy         = vxlan_policy,
3190         .priv_size      = sizeof(struct vxlan_dev),
3191         .setup          = vxlan_setup,
3192         .validate       = vxlan_validate,
3193         .newlink        = vxlan_newlink,
3194         .dellink        = vxlan_dellink,
3195         .get_size       = vxlan_get_size,
3196         .fill_info      = vxlan_fill_info,
3197         .get_link_net   = vxlan_get_link_net,
3198 };
3199
3200 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3201                                              struct net_device *dev)
3202 {
3203         struct vxlan_dev *vxlan, *next;
3204         LIST_HEAD(list_kill);
3205
3206         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3207                 struct vxlan_rdst *dst = &vxlan->default_dst;
3208
3209                 /* In case we created vxlan device with carrier
3210                  * and we loose the carrier due to module unload
3211                  * we also need to remove vxlan device. In other
3212                  * cases, it's not necessary and remote_ifindex
3213                  * is 0 here, so no matches.
3214                  */
3215                 if (dst->remote_ifindex == dev->ifindex)
3216                         vxlan_dellink(vxlan->dev, &list_kill);
3217         }
3218
3219         unregister_netdevice_many(&list_kill);
3220 }
3221
3222 static int vxlan_lowerdev_event(struct notifier_block *unused,
3223                                 unsigned long event, void *ptr)
3224 {
3225         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3226         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3227
3228         if (event == NETDEV_UNREGISTER)
3229                 vxlan_handle_lowerdev_unregister(vn, dev);
3230
3231         return NOTIFY_DONE;
3232 }
3233
3234 static struct notifier_block vxlan_notifier_block __read_mostly = {
3235         .notifier_call = vxlan_lowerdev_event,
3236 };
3237
3238 static __net_init int vxlan_init_net(struct net *net)
3239 {
3240         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3241         unsigned int h;
3242
3243         INIT_LIST_HEAD(&vn->vxlan_list);
3244         spin_lock_init(&vn->sock_lock);
3245
3246         for (h = 0; h < PORT_HASH_SIZE; ++h)
3247                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3248
3249         return 0;
3250 }
3251
3252 static void __net_exit vxlan_exit_net(struct net *net)
3253 {
3254         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3255         struct vxlan_dev *vxlan, *next;
3256         struct net_device *dev, *aux;
3257         LIST_HEAD(list);
3258
3259         rtnl_lock();
3260         for_each_netdev_safe(net, dev, aux)
3261                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3262                         unregister_netdevice_queue(dev, &list);
3263
3264         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3265                 /* If vxlan->dev is in the same netns, it has already been added
3266                  * to the list by the previous loop.
3267                  */
3268                 if (!net_eq(dev_net(vxlan->dev), net)) {
3269                         gro_cells_destroy(&vxlan->gro_cells);
3270                         unregister_netdevice_queue(vxlan->dev, &list);
3271                 }
3272         }
3273
3274         unregister_netdevice_many(&list);
3275         rtnl_unlock();
3276 }
3277
3278 static struct pernet_operations vxlan_net_ops = {
3279         .init = vxlan_init_net,
3280         .exit = vxlan_exit_net,
3281         .id   = &vxlan_net_id,
3282         .size = sizeof(struct vxlan_net),
3283 };
3284
3285 static int __init vxlan_init_module(void)
3286 {
3287         int rc;
3288
3289         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3290         if (!vxlan_wq)
3291                 return -ENOMEM;
3292
3293         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3294
3295         rc = register_pernet_subsys(&vxlan_net_ops);
3296         if (rc)
3297                 goto out1;
3298
3299         rc = register_netdevice_notifier(&vxlan_notifier_block);
3300         if (rc)
3301                 goto out2;
3302
3303         rc = rtnl_link_register(&vxlan_link_ops);
3304         if (rc)
3305                 goto out3;
3306
3307         return 0;
3308 out3:
3309         unregister_netdevice_notifier(&vxlan_notifier_block);
3310 out2:
3311         unregister_pernet_subsys(&vxlan_net_ops);
3312 out1:
3313         destroy_workqueue(vxlan_wq);
3314         return rc;
3315 }
3316 late_initcall(vxlan_init_module);
3317
3318 static void __exit vxlan_cleanup_module(void)
3319 {
3320         rtnl_link_unregister(&vxlan_link_ops);
3321         unregister_netdevice_notifier(&vxlan_notifier_block);
3322         destroy_workqueue(vxlan_wq);
3323         unregister_pernet_subsys(&vxlan_net_ops);
3324         /* rcu_barrier() is called by netns */
3325 }
3326 module_exit(vxlan_cleanup_module);
3327
3328 MODULE_LICENSE("GPL");
3329 MODULE_VERSION(VXLAN_VERSION);
3330 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3331 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3332 MODULE_ALIAS_RTNL_LINK("vxlan");