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
  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 + 2];
  77
  78 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  79
  80 /* per-network namespace private data for this module */
  81 struct vxlan_net {
  82         struct list_head  vxlan_list;
  83         struct hlist_head sock_list[PORT_HASH_SIZE];
  84         spinlock_t        sock_lock;
  85 };
  86
  87 /* Forwarding table entry */
  88 struct vxlan_fdb {
  89         struct hlist_node hlist;        /* linked list of entries */
  90         struct rcu_head   rcu;
  91         unsigned long     updated;      /* jiffies */
  92         unsigned long     used;
  93         struct list_head  remotes;
  94         u8                eth_addr[ETH_ALEN];
  95         u16               state;        /* see ndm_state */
  96         u8                flags;        /* see ndm_flags */
  97 };
  98
  99 /* salt for hash table */
 100 static u32 vxlan_salt __read_mostly;
 101 static struct workqueue_struct *vxlan_wq;
 102
 103 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
 104 {
 105         return vs->flags & VXLAN_F_COLLECT_METADATA ||
 106                ip_tunnel_collect_metadata();
 107 }
 108
 109 #if IS_ENABLED(CONFIG_IPV6)
 110 static inline
 111 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 112 {
 113         if (a->sa.sa_family != b->sa.sa_family)
 114                 return false;
 115         if (a->sa.sa_family == AF_INET6)
 116                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 117         else
 118                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 119 }
 120
 121 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 122 {
 123         if (ipa->sa.sa_family == AF_INET6)
 124                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
 125         else
 126                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 127 }
 128
 129 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 130 {
 131         if (ipa->sa.sa_family == AF_INET6)
 132                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 133         else
 134                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 135 }
 136
 137 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 138 {
 139         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 140                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 141                 ip->sa.sa_family = AF_INET6;
 142                 return 0;
 143         } else if (nla_len(nla) >= sizeof(__be32)) {
 144                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 145                 ip->sa.sa_family = AF_INET;
 146                 return 0;
 147         } else {
 148                 return -EAFNOSUPPORT;
 149         }
 150 }
 151
 152 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 153                               const union vxlan_addr *ip)
 154 {
 155         if (ip->sa.sa_family == AF_INET6)
 156                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 157         else
 158                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 159 }
 160
 161 #else /* !CONFIG_IPV6 */
 162
 163 static inline
 164 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 165 {
 166         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 167 }
 168
 169 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 170 {
 171         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 172 }
 173
 174 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 175 {
 176         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 177 }
 178
 179 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 180 {
 181         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 182                 return -EAFNOSUPPORT;
 183         } else if (nla_len(nla) >= sizeof(__be32)) {
 184                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 185                 ip->sa.sa_family = AF_INET;
 186                 return 0;
 187         } else {
 188                 return -EAFNOSUPPORT;
 189         }
 190 }
 191
 192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 193                               const union vxlan_addr *ip)
 194 {
 195         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 196 }
 197 #endif
 198
 199 /* Virtual Network hash table head */
 200 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
 201 {
 202         return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
 203 }
 204
 205 /* Socket hash table head */
 206 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 207 {
 208         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 209
 210         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 211 }
 212
 213 /* First remote destination for a forwarding entry.
 214  * Guaranteed to be non-NULL because remotes are never deleted.
 215  */
 216 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 217 {
 218         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 219 }
 220
 221 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 222 {
 223         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 224 }
 225
 226 /* Find VXLAN socket based on network namespace, address family and UDP port
 227  * and enabled unshareable flags.
 228  */
 229 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 230                                           __be16 port, u32 flags)
 231 {
 232         struct vxlan_sock *vs;
 233
 234         flags &= VXLAN_F_RCV_FLAGS;
 235
 236         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 237                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 238                     vxlan_get_sk_family(vs) == family &&
 239                     vs->flags == flags)
 240                         return vs;
 241         }
 242         return NULL;
 243 }
 244
 245 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
 246 {
 247         struct vxlan_dev *vxlan;
 248
 249         hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
 250                 if (vxlan->default_dst.remote_vni == id)
 251                         return vxlan;
 252         }
 253
 254         return NULL;
 255 }
 256
 257 /* Look up VNI in a per net namespace table */
 258 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
 259                                         sa_family_t family, __be16 port,
 260                                         u32 flags)
 261 {
 262         struct vxlan_sock *vs;
 263
 264         vs = vxlan_find_sock(net, family, port, flags);
 265         if (!vs)
 266                 return NULL;
 267
 268         return vxlan_vs_find_vni(vs, id);
 269 }
 270
 271 /* Fill in neighbour message in skbuff. */
 272 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 273                           const struct vxlan_fdb *fdb,
 274                           u32 portid, u32 seq, int type, unsigned int flags,
 275                           const struct vxlan_rdst *rdst)
 276 {
 277         unsigned long now = jiffies;
 278         struct nda_cacheinfo ci;
 279         struct nlmsghdr *nlh;
 280         struct ndmsg *ndm;
 281         bool send_ip, send_eth;
 282
 283         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 284         if (nlh == NULL)
 285                 return -EMSGSIZE;
 286
 287         ndm = nlmsg_data(nlh);
 288         memset(ndm, 0, sizeof(*ndm));
 289
 290         send_eth = send_ip = true;
 291
 292         if (type == RTM_GETNEIGH) {
 293                 ndm->ndm_family = AF_INET;
 294                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 295                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 296         } else
 297                 ndm->ndm_family = AF_BRIDGE;
 298         ndm->ndm_state = fdb->state;
 299         ndm->ndm_ifindex = vxlan->dev->ifindex;
 300         ndm->ndm_flags = fdb->flags;
 301         ndm->ndm_type = RTN_UNICAST;
 302
 303         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 304             nla_put_s32(skb, NDA_LINK_NETNSID,
 305                         peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
 306                 goto nla_put_failure;
 307
 308         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 309                 goto nla_put_failure;
 310
 311         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 312                 goto nla_put_failure;
 313
 314         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
 315             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 316                 goto nla_put_failure;
 317         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 318             nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
 319                 goto nla_put_failure;
 320         if (rdst->remote_ifindex &&
 321             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 322                 goto nla_put_failure;
 323
 324         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 325         ci.ndm_confirmed = 0;
 326         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 327         ci.ndm_refcnt    = 0;
 328
 329         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 330                 goto nla_put_failure;
 331
 332         nlmsg_end(skb, nlh);
 333         return 0;
 334
 335 nla_put_failure:
 336         nlmsg_cancel(skb, nlh);
 337         return -EMSGSIZE;
 338 }
 339
 340 static inline size_t vxlan_nlmsg_size(void)
 341 {
 342         return NLMSG_ALIGN(sizeof(struct ndmsg))
 343                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 344                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 345                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 346                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 347                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 348                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 349                 + nla_total_size(sizeof(struct nda_cacheinfo));
 350 }
 351
 352 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 353                              struct vxlan_rdst *rd, int type)
 354 {
 355         struct net *net = dev_net(vxlan->dev);
 356         struct sk_buff *skb;
 357         int err = -ENOBUFS;
 358
 359         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 360         if (skb == NULL)
 361                 goto errout;
 362
 363         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 364         if (err < 0) {
 365                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 366                 WARN_ON(err == -EMSGSIZE);
 367                 kfree_skb(skb);
 368                 goto errout;
 369         }
 370
 371         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 372         return;
 373 errout:
 374         if (err < 0)
 375                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 376 }
 377
 378 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 379 {
 380         struct vxlan_dev *vxlan = netdev_priv(dev);
 381         struct vxlan_fdb f = {
 382                 .state = NUD_STALE,
 383         };
 384         struct vxlan_rdst remote = {
 385                 .remote_ip = *ipa, /* goes to NDA_DST */
 386                 .remote_vni = VXLAN_N_VID,
 387         };
 388
 389         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 390 }
 391
 392 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 393 {
 394         struct vxlan_fdb f = {
 395                 .state = NUD_STALE,
 396         };
 397         struct vxlan_rdst remote = { };
 398
 399         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 400
 401         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 402 }
 403
 404 /* Hash Ethernet address */
 405 static u32 eth_hash(const unsigned char *addr)
 406 {
 407         u64 value = get_unaligned((u64 *)addr);
 408
 409         /* only want 6 bytes */
 410 #ifdef __BIG_ENDIAN
 411         value >>= 16;
 412 #else
 413         value <<= 16;
 414 #endif
 415         return hash_64(value, FDB_HASH_BITS);
 416 }
 417
 418 /* Hash chain to use given mac address */
 419 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 420                                                 const u8 *mac)
 421 {
 422         return &vxlan->fdb_head[eth_hash(mac)];
 423 }
 424
 425 /* Look up Ethernet address in forwarding table */
 426 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 427                                         const u8 *mac)
 428 {
 429         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 430         struct vxlan_fdb *f;
 431
 432         hlist_for_each_entry_rcu(f, head, hlist) {
 433                 if (ether_addr_equal(mac, f->eth_addr))
 434                         return f;
 435         }
 436
 437         return NULL;
 438 }
 439
 440 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 441                                         const u8 *mac)
 442 {
 443         struct vxlan_fdb *f;
 444
 445         f = __vxlan_find_mac(vxlan, mac);
 446         if (f)
 447                 f->used = jiffies;
 448
 449         return f;
 450 }
 451
 452 /* caller should hold vxlan->hash_lock */
 453 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 454                                               union vxlan_addr *ip, __be16 port,
 455                                               __u32 vni, __u32 ifindex)
 456 {
 457         struct vxlan_rdst *rd;
 458
 459         list_for_each_entry(rd, &f->remotes, list) {
 460                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 461                     rd->remote_port == port &&
 462                     rd->remote_vni == vni &&
 463                     rd->remote_ifindex == ifindex)
 464                         return rd;
 465         }
 466
 467         return NULL;
 468 }
 469
 470 /* Replace destination of unicast mac */
 471 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 472                              union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
 473 {
 474         struct vxlan_rdst *rd;
 475
 476         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 477         if (rd)
 478                 return 0;
 479
 480         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 481         if (!rd)
 482                 return 0;
 483
 484         dst_cache_reset(&rd->dst_cache);
 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
 507         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 508                 kfree(rd);
 509                 return -ENOBUFS;
 510         }
 511
 512         rd->remote_ip = *ip;
 513         rd->remote_port = port;
 514         rd->remote_vni = vni;
 515         rd->remote_ifindex = ifindex;
 516
 517         list_add_tail_rcu(&rd->list, &f->remotes);
 518
 519         *rdp = rd;
 520         return 1;
 521 }
 522
 523 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 524                                           unsigned int off,
 525                                           struct vxlanhdr *vh, size_t hdrlen,
 526                                           u32 data, struct gro_remcsum *grc,
 527                                           bool nopartial)
 528 {
 529         size_t start, offset;
 530
 531         if (skb->remcsum_offload)
 532                 return vh;
 533
 534         if (!NAPI_GRO_CB(skb)->csum_valid)
 535                 return NULL;
 536
 537         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
 538         offset = start + ((data & VXLAN_RCO_UDP) ?
 539                           offsetof(struct udphdr, check) :
 540                           offsetof(struct tcphdr, check));
 541
 542         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 543                                      start, offset, grc, nopartial);
 544
 545         skb->remcsum_offload = 1;
 546
 547         return vh;
 548 }
 549
 550 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
 551                                           struct sk_buff *skb,
 552                                           struct udp_offload *uoff)
 553 {
 554         struct sk_buff *p, **pp = NULL;
 555         struct vxlanhdr *vh, *vh2;
 556         unsigned int hlen, off_vx;
 557         int flush = 1;
 558         struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
 559                                              udp_offloads);
 560         u32 flags;
 561         struct gro_remcsum grc;
 562
 563         skb_gro_remcsum_init(&grc);
 564
 565         off_vx = skb_gro_offset(skb);
 566         hlen = off_vx + sizeof(*vh);
 567         vh   = skb_gro_header_fast(skb, off_vx);
 568         if (skb_gro_header_hard(skb, hlen)) {
 569                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 570                 if (unlikely(!vh))
 571                         goto out;
 572         }
 573
 574         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 575
 576         flags = ntohl(vh->vx_flags);
 577
 578         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 579                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 580                                        ntohl(vh->vx_vni), &grc,
 581                                        !!(vs->flags &
 582                                           VXLAN_F_REMCSUM_NOPARTIAL));
 583
 584                 if (!vh)
 585                         goto out;
 586         }
 587
 588         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 589
 590         flush = 0;
 591
 592         for (p = *head; p; p = p->next) {
 593                 if (!NAPI_GRO_CB(p)->same_flow)
 594                         continue;
 595
 596                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 597                 if (vh->vx_flags != vh2->vx_flags ||
 598                     vh->vx_vni != vh2->vx_vni) {
 599                         NAPI_GRO_CB(p)->same_flow = 0;
 600                         continue;
 601                 }
 602         }
 603
 604         pp = eth_gro_receive(head, skb);
 605
 606 out:
 607         skb_gro_remcsum_cleanup(skb, &grc);
 608         NAPI_GRO_CB(skb)->flush |= flush;
 609
 610         return pp;
 611 }
 612
 613 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
 614                               struct udp_offload *uoff)
 615 {
 616         udp_tunnel_gro_complete(skb, nhoff);
 617
 618         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 619 }
 620
 621 /* Notify netdevs that UDP port started listening */
 622 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
 623 {
 624         struct net_device *dev;
 625         struct sock *sk = vs->sock->sk;
 626         struct net *net = sock_net(sk);
 627         sa_family_t sa_family = vxlan_get_sk_family(vs);
 628         __be16 port = inet_sk(sk)->inet_sport;
 629         int err;
 630
 631         if (sa_family == AF_INET) {
 632                 err = udp_add_offload(net, &vs->udp_offloads);
 633                 if (err)
 634                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
 635         }
 636
 637         rcu_read_lock();
 638         for_each_netdev_rcu(net, dev) {
 639                 if (dev->netdev_ops->ndo_add_vxlan_port)
 640                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
 641                                                             port);
 642         }
 643         rcu_read_unlock();
 644 }
 645
 646 /* Notify netdevs that UDP port is no more listening */
 647 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
 648 {
 649         struct net_device *dev;
 650         struct sock *sk = vs->sock->sk;
 651         struct net *net = sock_net(sk);
 652         sa_family_t sa_family = vxlan_get_sk_family(vs);
 653         __be16 port = inet_sk(sk)->inet_sport;
 654
 655         rcu_read_lock();
 656         for_each_netdev_rcu(net, dev) {
 657                 if (dev->netdev_ops->ndo_del_vxlan_port)
 658                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
 659                                                             port);
 660         }
 661         rcu_read_unlock();
 662
 663         if (sa_family == AF_INET)
 664                 udp_del_offload(&vs->udp_offloads);
 665 }
 666
 667 /* Add new entry to forwarding table -- assumes lock held */
 668 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 669                             const u8 *mac, union vxlan_addr *ip,
 670                             __u16 state, __u16 flags,
 671                             __be16 port, __u32 vni, __u32 ifindex,
 672                             __u8 ndm_flags)
 673 {
 674         struct vxlan_rdst *rd = NULL;
 675         struct vxlan_fdb *f;
 676         int notify = 0;
 677
 678         f = __vxlan_find_mac(vxlan, mac);
 679         if (f) {
 680                 if (flags & NLM_F_EXCL) {
 681                         netdev_dbg(vxlan->dev,
 682                                    "lost race to create %pM\n", mac);
 683                         return -EEXIST;
 684                 }
 685                 if (f->state != state) {
 686                         f->state = state;
 687                         f->updated = jiffies;
 688                         notify = 1;
 689                 }
 690                 if (f->flags != ndm_flags) {
 691                         f->flags = ndm_flags;
 692                         f->updated = jiffies;
 693                         notify = 1;
 694                 }
 695                 if ((flags & NLM_F_REPLACE)) {
 696                         /* Only change unicasts */
 697                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 698                              is_zero_ether_addr(f->eth_addr))) {
 699                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
 700                                                            ifindex);
 701                         } else
 702                                 return -EOPNOTSUPP;
 703                 }
 704                 if ((flags & NLM_F_APPEND) &&
 705                     (is_multicast_ether_addr(f->eth_addr) ||
 706                      is_zero_ether_addr(f->eth_addr))) {
 707                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
 708                                                   &rd);
 709
 710                         if (rc < 0)
 711                                 return rc;
 712                         notify |= rc;
 713                 }
 714         } else {
 715                 if (!(flags & NLM_F_CREATE))
 716                         return -ENOENT;
 717
 718                 if (vxlan->cfg.addrmax &&
 719                     vxlan->addrcnt >= vxlan->cfg.addrmax)
 720                         return -ENOSPC;
 721
 722                 /* Disallow replace to add a multicast entry */
 723                 if ((flags & NLM_F_REPLACE) &&
 724                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 725                         return -EOPNOTSUPP;
 726
 727                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 728                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 729                 if (!f)
 730                         return -ENOMEM;
 731
 732                 notify = 1;
 733                 f->state = state;
 734                 f->flags = ndm_flags;
 735                 f->updated = f->used = jiffies;
 736                 INIT_LIST_HEAD(&f->remotes);
 737                 memcpy(f->eth_addr, mac, ETH_ALEN);
 738
 739                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 740
 741                 ++vxlan->addrcnt;
 742                 hlist_add_head_rcu(&f->hlist,
 743                                    vxlan_fdb_head(vxlan, mac));
 744         }
 745
 746         if (notify) {
 747                 if (rd == NULL)
 748                         rd = first_remote_rtnl(f);
 749                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 750         }
 751
 752         return 0;
 753 }
 754
 755 static void vxlan_fdb_free(struct rcu_head *head)
 756 {
 757         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 758         struct vxlan_rdst *rd, *nd;
 759
 760         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 761                 dst_cache_destroy(&rd->dst_cache);
 762                 kfree(rd);
 763         }
 764         kfree(f);
 765 }
 766
 767 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 768 {
 769         netdev_dbg(vxlan->dev,
 770                     "delete %pM\n", f->eth_addr);
 771
 772         --vxlan->addrcnt;
 773         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 774
 775         hlist_del_rcu(&f->hlist);
 776         call_rcu(&f->rcu, vxlan_fdb_free);
 777 }
 778
 779 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 780                            union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
 781 {
 782         struct net *net = dev_net(vxlan->dev);
 783         int err;
 784
 785         if (tb[NDA_DST]) {
 786                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 787                 if (err)
 788                         return err;
 789         } else {
 790                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 791                 if (remote->sa.sa_family == AF_INET) {
 792                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 793                         ip->sa.sa_family = AF_INET;
 794 #if IS_ENABLED(CONFIG_IPV6)
 795                 } else {
 796                         ip->sin6.sin6_addr = in6addr_any;
 797                         ip->sa.sa_family = AF_INET6;
 798 #endif
 799                 }
 800         }
 801
 802         if (tb[NDA_PORT]) {
 803                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 804                         return -EINVAL;
 805                 *port = nla_get_be16(tb[NDA_PORT]);
 806         } else {
 807                 *port = vxlan->cfg.dst_port;
 808         }
 809
 810         if (tb[NDA_VNI]) {
 811                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 812                         return -EINVAL;
 813                 *vni = nla_get_u32(tb[NDA_VNI]);
 814         } else {
 815                 *vni = vxlan->default_dst.remote_vni;
 816         }
 817
 818         if (tb[NDA_IFINDEX]) {
 819                 struct net_device *tdev;
 820
 821                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 822                         return -EINVAL;
 823                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 824                 tdev = __dev_get_by_index(net, *ifindex);
 825                 if (!tdev)
 826                         return -EADDRNOTAVAIL;
 827         } else {
 828                 *ifindex = 0;
 829         }
 830
 831         return 0;
 832 }
 833
 834 /* Add static entry (via netlink) */
 835 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 836                          struct net_device *dev,
 837                          const unsigned char *addr, u16 vid, u16 flags)
 838 {
 839         struct vxlan_dev *vxlan = netdev_priv(dev);
 840         /* struct net *net = dev_net(vxlan->dev); */
 841         union vxlan_addr ip;
 842         __be16 port;
 843         u32 vni, ifindex;
 844         int err;
 845
 846         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 847                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 848                         ndm->ndm_state);
 849                 return -EINVAL;
 850         }
 851
 852         if (tb[NDA_DST] == NULL)
 853                 return -EINVAL;
 854
 855         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 856         if (err)
 857                 return err;
 858
 859         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 860                 return -EAFNOSUPPORT;
 861
 862         spin_lock_bh(&vxlan->hash_lock);
 863         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 864                                port, vni, ifindex, ndm->ndm_flags);
 865         spin_unlock_bh(&vxlan->hash_lock);
 866
 867         return err;
 868 }
 869
 870 /* Delete entry (via netlink) */
 871 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 872                             struct net_device *dev,
 873                             const unsigned char *addr, u16 vid)
 874 {
 875         struct vxlan_dev *vxlan = netdev_priv(dev);
 876         struct vxlan_fdb *f;
 877         struct vxlan_rdst *rd = NULL;
 878         union vxlan_addr ip;
 879         __be16 port;
 880         u32 vni, ifindex;
 881         int err;
 882
 883         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 884         if (err)
 885                 return err;
 886
 887         err = -ENOENT;
 888
 889         spin_lock_bh(&vxlan->hash_lock);
 890         f = vxlan_find_mac(vxlan, addr);
 891         if (!f)
 892                 goto out;
 893
 894         if (!vxlan_addr_any(&ip)) {
 895                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 896                 if (!rd)
 897                         goto out;
 898         }
 899
 900         err = 0;
 901
 902         /* remove a destination if it's not the only one on the list,
 903          * otherwise destroy the fdb entry
 904          */
 905         if (rd && !list_is_singular(&f->remotes)) {
 906                 list_del_rcu(&rd->list);
 907                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 908                 kfree_rcu(rd, rcu);
 909                 goto out;
 910         }
 911
 912         vxlan_fdb_destroy(vxlan, f);
 913
 914 out:
 915         spin_unlock_bh(&vxlan->hash_lock);
 916
 917         return err;
 918 }
 919
 920 /* Dump forwarding table */
 921 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 922                           struct net_device *dev,
 923                           struct net_device *filter_dev, int idx)
 924 {
 925         struct vxlan_dev *vxlan = netdev_priv(dev);
 926         unsigned int h;
 927
 928         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 929                 struct vxlan_fdb *f;
 930                 int err;
 931
 932                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 933                         struct vxlan_rdst *rd;
 934
 935                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 936                                 if (idx < cb->args[0])
 937                                         goto skip;
 938
 939                                 err = vxlan_fdb_info(skb, vxlan, f,
 940                                                      NETLINK_CB(cb->skb).portid,
 941                                                      cb->nlh->nlmsg_seq,
 942                                                      RTM_NEWNEIGH,
 943                                                      NLM_F_MULTI, rd);
 944                                 if (err < 0)
 945                                         goto out;
 946 skip:
 947                                 ++idx;
 948                         }
 949                 }
 950         }
 951 out:
 952         return idx;
 953 }
 954
 955 /* Watch incoming packets to learn mapping between Ethernet address
 956  * and Tunnel endpoint.
 957  * Return true if packet is bogus and should be dropped.
 958  */
 959 static bool vxlan_snoop(struct net_device *dev,
 960                         union vxlan_addr *src_ip, const u8 *src_mac)
 961 {
 962         struct vxlan_dev *vxlan = netdev_priv(dev);
 963         struct vxlan_fdb *f;
 964
 965         f = vxlan_find_mac(vxlan, src_mac);
 966         if (likely(f)) {
 967                 struct vxlan_rdst *rdst = first_remote_rcu(f);
 968
 969                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
 970                         return false;
 971
 972                 /* Don't migrate static entries, drop packets */
 973                 if (f->state & NUD_NOARP)
 974                         return true;
 975
 976                 if (net_ratelimit())
 977                         netdev_info(dev,
 978                                     "%pM migrated from %pIS to %pIS\n",
 979                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
 980
 981                 rdst->remote_ip = *src_ip;
 982                 f->updated = jiffies;
 983                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
 984         } else {
 985                 /* learned new entry */
 986                 spin_lock(&vxlan->hash_lock);
 987
 988                 /* close off race between vxlan_flush and incoming packets */
 989                 if (netif_running(dev))
 990                         vxlan_fdb_create(vxlan, src_mac, src_ip,
 991                                          NUD_REACHABLE,
 992                                          NLM_F_EXCL|NLM_F_CREATE,
 993                                          vxlan->cfg.dst_port,
 994                                          vxlan->default_dst.remote_vni,
 995                                          0, NTF_SELF);
 996                 spin_unlock(&vxlan->hash_lock);
 997         }
 998
 999         return false;
1000 }
1001
1002 /* See if multicast group is already in use by other ID */
1003 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1004 {
1005         struct vxlan_dev *vxlan;
1006         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1007
1008         /* The vxlan_sock is only used by dev, leaving group has
1009          * no effect on other vxlan devices.
1010          */
1011         if (family == AF_INET && dev->vn4_sock &&
1012             atomic_read(&dev->vn4_sock->refcnt) == 1)
1013                 return false;
1014 #if IS_ENABLED(CONFIG_IPV6)
1015         if (family == AF_INET6 && dev->vn6_sock &&
1016             atomic_read(&dev->vn6_sock->refcnt) == 1)
1017                 return false;
1018 #endif
1019
1020         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1021                 if (!netif_running(vxlan->dev) || vxlan == dev)
1022                         continue;
1023
1024                 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1025                         continue;
1026 #if IS_ENABLED(CONFIG_IPV6)
1027                 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1028                         continue;
1029 #endif
1030
1031                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1032                                       &dev->default_dst.remote_ip))
1033                         continue;
1034
1035                 if (vxlan->default_dst.remote_ifindex !=
1036                     dev->default_dst.remote_ifindex)
1037                         continue;
1038
1039                 return true;
1040         }
1041
1042         return false;
1043 }
1044
1045 static void __vxlan_sock_release(struct vxlan_sock *vs)
1046 {
1047         struct vxlan_net *vn;
1048
1049         if (!vs)
1050                 return;
1051         if (!atomic_dec_and_test(&vs->refcnt))
1052                 return;
1053
1054         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1055         spin_lock(&vn->sock_lock);
1056         hlist_del_rcu(&vs->hlist);
1057         vxlan_notify_del_rx_port(vs);
1058         spin_unlock(&vn->sock_lock);
1059
1060         queue_work(vxlan_wq, &vs->del_work);
1061 }
1062
1063 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1064 {
1065         __vxlan_sock_release(vxlan->vn4_sock);
1066 #if IS_ENABLED(CONFIG_IPV6)
1067         __vxlan_sock_release(vxlan->vn6_sock);
1068 #endif
1069 }
1070
1071 /* Update multicast group membership when first VNI on
1072  * multicast address is brought up
1073  */
1074 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1075 {
1076         struct sock *sk;
1077         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1078         int ifindex = vxlan->default_dst.remote_ifindex;
1079         int ret = -EINVAL;
1080
1081         if (ip->sa.sa_family == AF_INET) {
1082                 struct ip_mreqn mreq = {
1083                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1084                         .imr_ifindex            = ifindex,
1085                 };
1086
1087                 sk = vxlan->vn4_sock->sock->sk;
1088                 lock_sock(sk);
1089                 ret = ip_mc_join_group(sk, &mreq);
1090                 release_sock(sk);
1091 #if IS_ENABLED(CONFIG_IPV6)
1092         } else {
1093                 sk = vxlan->vn6_sock->sock->sk;
1094                 lock_sock(sk);
1095                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1096                                                    &ip->sin6.sin6_addr);
1097                 release_sock(sk);
1098 #endif
1099         }
1100
1101         return ret;
1102 }
1103
1104 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1105 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1106 {
1107         struct sock *sk;
1108         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1109         int ifindex = vxlan->default_dst.remote_ifindex;
1110         int ret = -EINVAL;
1111
1112         if (ip->sa.sa_family == AF_INET) {
1113                 struct ip_mreqn mreq = {
1114                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1115                         .imr_ifindex            = ifindex,
1116                 };
1117
1118                 sk = vxlan->vn4_sock->sock->sk;
1119                 lock_sock(sk);
1120                 ret = ip_mc_leave_group(sk, &mreq);
1121                 release_sock(sk);
1122 #if IS_ENABLED(CONFIG_IPV6)
1123         } else {
1124                 sk = vxlan->vn6_sock->sock->sk;
1125                 lock_sock(sk);
1126                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1127                                                    &ip->sin6.sin6_addr);
1128                 release_sock(sk);
1129 #endif
1130         }
1131
1132         return ret;
1133 }
1134
1135 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1136                                       size_t hdrlen, u32 data, bool nopartial)
1137 {
1138         size_t start, offset, plen;
1139
1140         if (skb->remcsum_offload)
1141                 return vh;
1142
1143         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1144         offset = start + ((data & VXLAN_RCO_UDP) ?
1145                           offsetof(struct udphdr, check) :
1146                           offsetof(struct tcphdr, check));
1147
1148         plen = hdrlen + offset + sizeof(u16);
1149
1150         if (!pskb_may_pull(skb, plen))
1151                 return NULL;
1152
1153         vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1154
1155         skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1156                             nopartial);
1157
1158         return vh;
1159 }
1160
1161 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1162                       struct vxlan_metadata *md, u32 vni,
1163                       struct metadata_dst *tun_dst)
1164 {
1165         struct iphdr *oip = NULL;
1166         struct ipv6hdr *oip6 = NULL;
1167         struct vxlan_dev *vxlan;
1168         struct pcpu_sw_netstats *stats;
1169         union vxlan_addr saddr;
1170         int err = 0;
1171
1172         /* For flow based devices, map all packets to VNI 0 */
1173         if (vs->flags & VXLAN_F_COLLECT_METADATA)
1174                 vni = 0;
1175
1176         /* Is this VNI defined? */
1177         vxlan = vxlan_vs_find_vni(vs, vni);
1178         if (!vxlan)
1179                 goto drop;
1180
1181         skb_reset_mac_header(skb);
1182         skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1183         skb->protocol = eth_type_trans(skb, vxlan->dev);
1184         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1185
1186         /* Ignore packet loops (and multicast echo) */
1187         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1188                 goto drop;
1189
1190         /* Get data from the outer IP header */
1191         if (vxlan_get_sk_family(vs) == AF_INET) {
1192                 oip = ip_hdr(skb);
1193                 saddr.sin.sin_addr.s_addr = oip->saddr;
1194                 saddr.sa.sa_family = AF_INET;
1195 #if IS_ENABLED(CONFIG_IPV6)
1196         } else {
1197                 oip6 = ipv6_hdr(skb);
1198                 saddr.sin6.sin6_addr = oip6->saddr;
1199                 saddr.sa.sa_family = AF_INET6;
1200 #endif
1201         }
1202
1203         if (tun_dst) {
1204                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1205                 tun_dst = NULL;
1206         }
1207
1208         if ((vxlan->flags & VXLAN_F_LEARN) &&
1209             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1210                 goto drop;
1211
1212         skb_reset_network_header(skb);
1213         /* In flow-based mode, GBP is carried in dst_metadata */
1214         if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1215                 skb->mark = md->gbp;
1216
1217         if (oip6)
1218                 err = IP6_ECN_decapsulate(oip6, skb);
1219         if (oip)
1220                 err = IP_ECN_decapsulate(oip, skb);
1221
1222         if (unlikely(err)) {
1223                 if (log_ecn_error) {
1224                         if (oip6)
1225                                 net_info_ratelimited("non-ECT from %pI6\n",
1226                                                      &oip6->saddr);
1227                         if (oip)
1228                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1229                                                      &oip->saddr, oip->tos);
1230                 }
1231                 if (err > 1) {
1232                         ++vxlan->dev->stats.rx_frame_errors;
1233                         ++vxlan->dev->stats.rx_errors;
1234                         goto drop;
1235                 }
1236         }
1237
1238         stats = this_cpu_ptr(vxlan->dev->tstats);
1239         u64_stats_update_begin(&stats->syncp);
1240         stats->rx_packets++;
1241         stats->rx_bytes += skb->len;
1242         u64_stats_update_end(&stats->syncp);
1243
1244         gro_cells_receive(&vxlan->gro_cells, skb);
1245
1246         return;
1247 drop:
1248         if (tun_dst)
1249                 dst_release((struct dst_entry *)tun_dst);
1250
1251         /* Consume bad packet */
1252         kfree_skb(skb);
1253 }
1254
1255 /* Callback from net/ipv4/udp.c to receive packets */
1256 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1257 {
1258         struct metadata_dst *tun_dst = NULL;
1259         struct vxlan_sock *vs;
1260         struct vxlanhdr *vxh;
1261         u32 flags, vni;
1262         struct vxlan_metadata _md;
1263         struct vxlan_metadata *md = &_md;
1264
1265         /* Need Vxlan and inner Ethernet header to be present */
1266         if (!pskb_may_pull(skb, VXLAN_HLEN))
1267                 goto error;
1268
1269         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1270         flags = ntohl(vxh->vx_flags);
1271         vni = ntohl(vxh->vx_vni);
1272
1273         if (flags & VXLAN_HF_VNI) {
1274                 flags &= ~VXLAN_HF_VNI;
1275         } else {
1276                 /* VNI flag always required to be set */
1277                 goto bad_flags;
1278         }
1279
1280         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1281                 goto drop;
1282         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1283
1284         vs = rcu_dereference_sk_user_data(sk);
1285         if (!vs)
1286                 goto drop;
1287
1288         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1289                 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1290                                     !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1291                 if (!vxh)
1292                         goto drop;
1293
1294                 flags &= ~VXLAN_HF_RCO;
1295                 vni &= VXLAN_VNI_MASK;
1296         }
1297
1298         if (vxlan_collect_metadata(vs)) {
1299                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1300                                          cpu_to_be64(vni >> 8), sizeof(*md));
1301
1302                 if (!tun_dst)
1303                         goto drop;
1304
1305                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1306         } else {
1307                 memset(md, 0, sizeof(*md));
1308         }
1309
1310         /* For backwards compatibility, only allow reserved fields to be
1311          * used by VXLAN extensions if explicitly requested.
1312          */
1313         if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1314                 struct vxlanhdr_gbp *gbp;
1315
1316                 gbp = (struct vxlanhdr_gbp *)vxh;
1317                 md->gbp = ntohs(gbp->policy_id);
1318
1319                 if (tun_dst)
1320                         tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1321
1322                 if (gbp->dont_learn)
1323                         md->gbp |= VXLAN_GBP_DONT_LEARN;
1324
1325                 if (gbp->policy_applied)
1326                         md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1327
1328                 flags &= ~VXLAN_GBP_USED_BITS;
1329         }
1330
1331         if (flags || vni & ~VXLAN_VNI_MASK) {
1332                 /* If there are any unprocessed flags remaining treat
1333                  * this as a malformed packet. This behavior diverges from
1334                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1335                  * in reserved fields are to be ignored. The approach here
1336                  * maintains compatibility with previous stack code, and also
1337                  * is more robust and provides a little more security in
1338                  * adding extensions to VXLAN.
1339                  */
1340
1341                 goto bad_flags;
1342         }
1343
1344         vxlan_rcv(vs, skb, md, vni >> 8, tun_dst);
1345         return 0;
1346
1347 drop:
1348         /* Consume bad packet */
1349         kfree_skb(skb);
1350         return 0;
1351
1352 bad_flags:
1353         netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1354                    ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1355
1356 error:
1357         if (tun_dst)
1358                 dst_release((struct dst_entry *)tun_dst);
1359
1360         /* Return non vxlan pkt */
1361         return 1;
1362 }
1363
1364 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1365 {
1366         struct vxlan_dev *vxlan = netdev_priv(dev);
1367         struct arphdr *parp;
1368         u8 *arpptr, *sha;
1369         __be32 sip, tip;
1370         struct neighbour *n;
1371
1372         if (dev->flags & IFF_NOARP)
1373                 goto out;
1374
1375         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1376                 dev->stats.tx_dropped++;
1377                 goto out;
1378         }
1379         parp = arp_hdr(skb);
1380
1381         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1382              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1383             parp->ar_pro != htons(ETH_P_IP) ||
1384             parp->ar_op != htons(ARPOP_REQUEST) ||
1385             parp->ar_hln != dev->addr_len ||
1386             parp->ar_pln != 4)
1387                 goto out;
1388         arpptr = (u8 *)parp + sizeof(struct arphdr);
1389         sha = arpptr;
1390         arpptr += dev->addr_len;        /* sha */
1391         memcpy(&sip, arpptr, sizeof(sip));
1392         arpptr += sizeof(sip);
1393         arpptr += dev->addr_len;        /* tha */
1394         memcpy(&tip, arpptr, sizeof(tip));
1395
1396         if (ipv4_is_loopback(tip) ||
1397             ipv4_is_multicast(tip))
1398                 goto out;
1399
1400         n = neigh_lookup(&arp_tbl, &tip, dev);
1401
1402         if (n) {
1403                 struct vxlan_fdb *f;
1404                 struct sk_buff  *reply;
1405
1406                 if (!(n->nud_state & NUD_CONNECTED)) {
1407                         neigh_release(n);
1408                         goto out;
1409                 }
1410
1411                 f = vxlan_find_mac(vxlan, n->ha);
1412                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1413                         /* bridge-local neighbor */
1414                         neigh_release(n);
1415                         goto out;
1416                 }
1417
1418                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1419                                 n->ha, sha);
1420
1421                 neigh_release(n);
1422
1423                 if (reply == NULL)
1424                         goto out;
1425
1426                 skb_reset_mac_header(reply);
1427                 __skb_pull(reply, skb_network_offset(reply));
1428                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1429                 reply->pkt_type = PACKET_HOST;
1430
1431                 if (netif_rx_ni(reply) == NET_RX_DROP)
1432                         dev->stats.rx_dropped++;
1433         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1434                 union vxlan_addr ipa = {
1435                         .sin.sin_addr.s_addr = tip,
1436                         .sin.sin_family = AF_INET,
1437                 };
1438
1439                 vxlan_ip_miss(dev, &ipa);
1440         }
1441 out:
1442         consume_skb(skb);
1443         return NETDEV_TX_OK;
1444 }
1445
1446 #if IS_ENABLED(CONFIG_IPV6)
1447 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1448         struct neighbour *n, bool isrouter)
1449 {
1450         struct net_device *dev = request->dev;
1451         struct sk_buff *reply;
1452         struct nd_msg *ns, *na;
1453         struct ipv6hdr *pip6;
1454         u8 *daddr;
1455         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1456         int ns_olen;
1457         int i, len;
1458
1459         if (dev == NULL)
1460                 return NULL;
1461
1462         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1463                 sizeof(*na) + na_olen + dev->needed_tailroom;
1464         reply = alloc_skb(len, GFP_ATOMIC);
1465         if (reply == NULL)
1466                 return NULL;
1467
1468         reply->protocol = htons(ETH_P_IPV6);
1469         reply->dev = dev;
1470         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1471         skb_push(reply, sizeof(struct ethhdr));
1472         skb_set_mac_header(reply, 0);
1473
1474         ns = (struct nd_msg *)skb_transport_header(request);
1475
1476         daddr = eth_hdr(request)->h_source;
1477         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1478         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1479                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1480                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1481                         break;
1482                 }
1483         }
1484
1485         /* Ethernet header */
1486         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1487         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1488         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1489         reply->protocol = htons(ETH_P_IPV6);
1490
1491         skb_pull(reply, sizeof(struct ethhdr));
1492         skb_set_network_header(reply, 0);
1493         skb_put(reply, sizeof(struct ipv6hdr));
1494
1495         /* IPv6 header */
1496
1497         pip6 = ipv6_hdr(reply);
1498         memset(pip6, 0, sizeof(struct ipv6hdr));
1499         pip6->version = 6;
1500         pip6->priority = ipv6_hdr(request)->priority;
1501         pip6->nexthdr = IPPROTO_ICMPV6;
1502         pip6->hop_limit = 255;
1503         pip6->daddr = ipv6_hdr(request)->saddr;
1504         pip6->saddr = *(struct in6_addr *)n->primary_key;
1505
1506         skb_pull(reply, sizeof(struct ipv6hdr));
1507         skb_set_transport_header(reply, 0);
1508
1509         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1510
1511         /* Neighbor Advertisement */
1512         memset(na, 0, sizeof(*na)+na_olen);
1513         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1514         na->icmph.icmp6_router = isrouter;
1515         na->icmph.icmp6_override = 1;
1516         na->icmph.icmp6_solicited = 1;
1517         na->target = ns->target;
1518         ether_addr_copy(&na->opt[2], n->ha);
1519         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1520         na->opt[1] = na_olen >> 3;
1521
1522         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1523                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1524                 csum_partial(na, sizeof(*na)+na_olen, 0));
1525
1526         pip6->payload_len = htons(sizeof(*na)+na_olen);
1527
1528         skb_push(reply, sizeof(struct ipv6hdr));
1529
1530         reply->ip_summed = CHECKSUM_UNNECESSARY;
1531
1532         return reply;
1533 }
1534
1535 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1536 {
1537         struct vxlan_dev *vxlan = netdev_priv(dev);
1538         struct nd_msg *msg;
1539         const struct ipv6hdr *iphdr;
1540         const struct in6_addr *saddr, *daddr;
1541         struct neighbour *n;
1542         struct inet6_dev *in6_dev;
1543
1544         in6_dev = __in6_dev_get(dev);
1545         if (!in6_dev)
1546                 goto out;
1547
1548         iphdr = ipv6_hdr(skb);
1549         saddr = &iphdr->saddr;
1550         daddr = &iphdr->daddr;
1551
1552         msg = (struct nd_msg *)skb_transport_header(skb);
1553         if (msg->icmph.icmp6_code != 0 ||
1554             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1555                 goto out;
1556
1557         if (ipv6_addr_loopback(daddr) ||
1558             ipv6_addr_is_multicast(&msg->target))
1559                 goto out;
1560
1561         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1562
1563         if (n) {
1564                 struct vxlan_fdb *f;
1565                 struct sk_buff *reply;
1566
1567                 if (!(n->nud_state & NUD_CONNECTED)) {
1568                         neigh_release(n);
1569                         goto out;
1570                 }
1571
1572                 f = vxlan_find_mac(vxlan, n->ha);
1573                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1574                         /* bridge-local neighbor */
1575                         neigh_release(n);
1576                         goto out;
1577                 }
1578
1579                 reply = vxlan_na_create(skb, n,
1580                                         !!(f ? f->flags & NTF_ROUTER : 0));
1581
1582                 neigh_release(n);
1583
1584                 if (reply == NULL)
1585                         goto out;
1586
1587                 if (netif_rx_ni(reply) == NET_RX_DROP)
1588                         dev->stats.rx_dropped++;
1589
1590         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1591                 union vxlan_addr ipa = {
1592                         .sin6.sin6_addr = msg->target,
1593                         .sin6.sin6_family = AF_INET6,
1594                 };
1595
1596                 vxlan_ip_miss(dev, &ipa);
1597         }
1598
1599 out:
1600         consume_skb(skb);
1601         return NETDEV_TX_OK;
1602 }
1603 #endif
1604
1605 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1606 {
1607         struct vxlan_dev *vxlan = netdev_priv(dev);
1608         struct neighbour *n;
1609
1610         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1611                 return false;
1612
1613         n = NULL;
1614         switch (ntohs(eth_hdr(skb)->h_proto)) {
1615         case ETH_P_IP:
1616         {
1617                 struct iphdr *pip;
1618
1619                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1620                         return false;
1621                 pip = ip_hdr(skb);
1622                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1623                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1624                         union vxlan_addr ipa = {
1625                                 .sin.sin_addr.s_addr = pip->daddr,
1626                                 .sin.sin_family = AF_INET,
1627                         };
1628
1629                         vxlan_ip_miss(dev, &ipa);
1630                         return false;
1631                 }
1632
1633                 break;
1634         }
1635 #if IS_ENABLED(CONFIG_IPV6)
1636         case ETH_P_IPV6:
1637         {
1638                 struct ipv6hdr *pip6;
1639
1640                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1641                         return false;
1642                 pip6 = ipv6_hdr(skb);
1643                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1644                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1645                         union vxlan_addr ipa = {
1646                                 .sin6.sin6_addr = pip6->daddr,
1647                                 .sin6.sin6_family = AF_INET6,
1648                         };
1649
1650                         vxlan_ip_miss(dev, &ipa);
1651                         return false;
1652                 }
1653
1654                 break;
1655         }
1656 #endif
1657         default:
1658                 return false;
1659         }
1660
1661         if (n) {
1662                 bool diff;
1663
1664                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1665                 if (diff) {
1666                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1667                                 dev->addr_len);
1668                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1669                 }
1670                 neigh_release(n);
1671                 return diff;
1672         }
1673
1674         return false;
1675 }
1676
1677 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1678                                 struct vxlan_metadata *md)
1679 {
1680         struct vxlanhdr_gbp *gbp;
1681
1682         if (!md->gbp)
1683                 return;
1684
1685         gbp = (struct vxlanhdr_gbp *)vxh;
1686         vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1687
1688         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1689                 gbp->dont_learn = 1;
1690
1691         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1692                 gbp->policy_applied = 1;
1693
1694         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1695 }
1696
1697 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1698                            int iphdr_len, __be32 vni,
1699                            struct vxlan_metadata *md, u32 vxflags,
1700                            bool udp_sum)
1701 {
1702         struct vxlanhdr *vxh;
1703         int min_headroom;
1704         int err;
1705         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1706         u16 hdrlen = sizeof(struct vxlanhdr);
1707
1708         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1709             skb->ip_summed == CHECKSUM_PARTIAL) {
1710                 int csum_start = skb_checksum_start_offset(skb);
1711
1712                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1713                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1714                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1715                      skb->csum_offset == offsetof(struct tcphdr, check)))
1716                         type |= SKB_GSO_TUNNEL_REMCSUM;
1717         }
1718
1719         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1720                         + VXLAN_HLEN + iphdr_len
1721                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1722
1723         /* Need space for new headers (invalidates iph ptr) */
1724         err = skb_cow_head(skb, min_headroom);
1725         if (unlikely(err)) {
1726                 kfree_skb(skb);
1727                 return err;
1728         }
1729
1730         skb = vlan_hwaccel_push_inside(skb);
1731         if (WARN_ON(!skb))
1732                 return -ENOMEM;
1733
1734         skb = iptunnel_handle_offloads(skb, type);
1735         if (IS_ERR(skb))
1736                 return PTR_ERR(skb);
1737
1738         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1739         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1740         vxh->vx_vni = vni;
1741
1742         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1743                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1744                            VXLAN_RCO_SHIFT;
1745
1746                 if (skb->csum_offset == offsetof(struct udphdr, check))
1747                         data |= VXLAN_RCO_UDP;
1748
1749                 vxh->vx_vni |= htonl(data);
1750                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1751
1752                 if (!skb_is_gso(skb)) {
1753                         skb->ip_summed = CHECKSUM_NONE;
1754                         skb->encapsulation = 0;
1755                 }
1756         }
1757
1758         if (vxflags & VXLAN_F_GBP)
1759                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1760
1761         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1762         return 0;
1763 }
1764
1765 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1766                                       struct sk_buff *skb, int oif, u8 tos,
1767                                       __be32 daddr, __be32 *saddr,
1768                                       struct dst_cache *dst_cache,
1769                                       struct ip_tunnel_info *info)
1770 {
1771         struct rtable *rt = NULL;
1772         bool use_cache = false;
1773         struct flowi4 fl4;
1774
1775         /* when the ip_tunnel_info is availble, the tos used for lookup is
1776          * packet independent, so we can use the cache
1777          */
1778         if (dst_cache && !skb->mark && (!tos || info)) {
1779                 use_cache = true;
1780                 rt = dst_cache_get_ip4(dst_cache, saddr);
1781                 if (rt)
1782                         return rt;
1783         }
1784
1785         memset(&fl4, 0, sizeof(fl4));
1786         fl4.flowi4_oif = oif;
1787         fl4.flowi4_tos = RT_TOS(tos);
1788         fl4.flowi4_mark = skb->mark;
1789         fl4.flowi4_proto = IPPROTO_UDP;
1790         fl4.daddr = daddr;
1791         fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1792
1793         rt = ip_route_output_key(vxlan->net, &fl4);
1794         if (!IS_ERR(rt)) {
1795                 *saddr = fl4.saddr;
1796                 if (use_cache)
1797                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1798         }
1799         return rt;
1800 }
1801
1802 #if IS_ENABLED(CONFIG_IPV6)
1803 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1804                                           struct sk_buff *skb, int oif,
1805                                           const struct in6_addr *daddr,
1806                                           struct in6_addr *saddr,
1807                                           struct dst_cache *dst_cache)
1808 {
1809         bool use_cache = false;
1810         struct dst_entry *ndst;
1811         struct flowi6 fl6;
1812         int err;
1813
1814         if (dst_cache && !skb->mark) {
1815                 use_cache = true;
1816                 ndst = dst_cache_get_ip6(dst_cache, saddr);
1817                 if (ndst)
1818                         return ndst;
1819         }
1820
1821         memset(&fl6, 0, sizeof(fl6));
1822         fl6.flowi6_oif = oif;
1823         fl6.daddr = *daddr;
1824         fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1825         fl6.flowi6_mark = skb->mark;
1826         fl6.flowi6_proto = IPPROTO_UDP;
1827
1828         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1829                                          vxlan->vn6_sock->sock->sk,
1830                                          &ndst, &fl6);
1831         if (err < 0)
1832                 return ERR_PTR(err);
1833
1834         *saddr = fl6.saddr;
1835         if (use_cache)
1836                 dst_cache_set_ip6(dst_cache, ndst, saddr);
1837         return ndst;
1838 }
1839 #endif
1840
1841 /* Bypass encapsulation if the destination is local */
1842 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1843                                struct vxlan_dev *dst_vxlan)
1844 {
1845         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1846         union vxlan_addr loopback;
1847         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1848         struct net_device *dev = skb->dev;
1849         int len = skb->len;
1850
1851         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1852         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1853         skb->pkt_type = PACKET_HOST;
1854         skb->encapsulation = 0;
1855         skb->dev = dst_vxlan->dev;
1856         __skb_pull(skb, skb_network_offset(skb));
1857
1858         if (remote_ip->sa.sa_family == AF_INET) {
1859                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1860                 loopback.sa.sa_family =  AF_INET;
1861 #if IS_ENABLED(CONFIG_IPV6)
1862         } else {
1863                 loopback.sin6.sin6_addr = in6addr_loopback;
1864                 loopback.sa.sa_family =  AF_INET6;
1865 #endif
1866         }
1867
1868         if (dst_vxlan->flags & VXLAN_F_LEARN)
1869                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1870
1871         u64_stats_update_begin(&tx_stats->syncp);
1872         tx_stats->tx_packets++;
1873         tx_stats->tx_bytes += len;
1874         u64_stats_update_end(&tx_stats->syncp);
1875
1876         if (netif_rx(skb) == NET_RX_SUCCESS) {
1877                 u64_stats_update_begin(&rx_stats->syncp);
1878                 rx_stats->rx_packets++;
1879                 rx_stats->rx_bytes += len;
1880                 u64_stats_update_end(&rx_stats->syncp);
1881         } else {
1882                 dev->stats.rx_dropped++;
1883         }
1884 }
1885
1886 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1887                            struct vxlan_rdst *rdst, bool did_rsc)
1888 {
1889         struct ip_tunnel_info *info;
1890         struct vxlan_dev *vxlan = netdev_priv(dev);
1891         struct sock *sk;
1892         struct rtable *rt = NULL;
1893         const struct iphdr *old_iph;
1894         union vxlan_addr *dst;
1895         union vxlan_addr remote_ip;
1896         struct vxlan_metadata _md;
1897         struct vxlan_metadata *md = &_md;
1898         __be16 src_port = 0, dst_port;
1899         u32 vni;
1900         __be16 df = 0;
1901         __u8 tos, ttl;
1902         int err;
1903         u32 flags = vxlan->flags;
1904         bool udp_sum = false;
1905         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1906
1907         info = skb_tunnel_info(skb);
1908
1909         if (rdst) {
1910                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1911                 vni = rdst->remote_vni;
1912                 dst = &rdst->remote_ip;
1913         } else {
1914                 if (!info) {
1915                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1916                                   dev->name);
1917                         goto drop;
1918                 }
1919                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1920                 vni = be64_to_cpu(info->key.tun_id);
1921                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1922                 if (remote_ip.sa.sa_family == AF_INET)
1923                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1924                 else
1925                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1926                 dst = &remote_ip;
1927         }
1928
1929         if (vxlan_addr_any(dst)) {
1930                 if (did_rsc) {
1931                         /* short-circuited back to local bridge */
1932                         vxlan_encap_bypass(skb, vxlan, vxlan);
1933                         return;
1934                 }
1935                 goto drop;
1936         }
1937
1938         old_iph = ip_hdr(skb);
1939
1940         ttl = vxlan->cfg.ttl;
1941         if (!ttl && vxlan_addr_multicast(dst))
1942                 ttl = 1;
1943
1944         tos = vxlan->cfg.tos;
1945         if (tos == 1)
1946                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1947
1948         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1949                                      vxlan->cfg.port_max, true);
1950
1951         if (info) {
1952                 ttl = info->key.ttl;
1953                 tos = info->key.tos;
1954                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
1955
1956                 if (info->options_len)
1957                         md = ip_tunnel_info_opts(info);
1958         } else {
1959                 md->gbp = skb->mark;
1960         }
1961
1962         if (dst->sa.sa_family == AF_INET) {
1963                 __be32 saddr;
1964
1965                 if (!vxlan->vn4_sock)
1966                         goto drop;
1967                 sk = vxlan->vn4_sock->sock->sk;
1968
1969                 if (info) {
1970                         if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
1971                                 df = htons(IP_DF);
1972                 } else {
1973                         udp_sum = !!(flags & VXLAN_F_UDP_CSUM);
1974                 }
1975
1976                 rt = vxlan_get_route(vxlan, skb,
1977                                      rdst ? rdst->remote_ifindex : 0, tos,
1978                                      dst->sin.sin_addr.s_addr, &saddr,
1979                                      rdst ? &rdst->dst_cache : NULL, info);
1980                 if (IS_ERR(rt)) {
1981                         netdev_dbg(dev, "no route to %pI4\n",
1982                                    &dst->sin.sin_addr.s_addr);
1983                         dev->stats.tx_carrier_errors++;
1984                         goto tx_error;
1985                 }
1986
1987                 if (rt->dst.dev == dev) {
1988                         netdev_dbg(dev, "circular route to %pI4\n",
1989                                    &dst->sin.sin_addr.s_addr);
1990                         dev->stats.collisions++;
1991                         goto rt_tx_error;
1992                 }
1993
1994                 /* Bypass encapsulation if the destination is local */
1995                 if (rt->rt_flags & RTCF_LOCAL &&
1996                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1997                         struct vxlan_dev *dst_vxlan;
1998
1999                         ip_rt_put(rt);
2000                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2001                                                    dst->sa.sa_family, dst_port,
2002                                                    vxlan->flags);
2003                         if (!dst_vxlan)
2004                                 goto tx_error;
2005                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2006                         return;
2007                 }
2008
2009                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2010                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2011                 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2012                                       htonl(vni << 8), md, flags, udp_sum);
2013                 if (err < 0)
2014                         goto xmit_tx_error;
2015
2016                 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2017                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2018                                     src_port, dst_port, xnet, !udp_sum);
2019 #if IS_ENABLED(CONFIG_IPV6)
2020         } else {
2021                 struct dst_entry *ndst;
2022                 struct in6_addr saddr;
2023                 u32 rt6i_flags;
2024
2025                 if (!vxlan->vn6_sock)
2026                         goto drop;
2027                 sk = vxlan->vn6_sock->sock->sk;
2028
2029                 ndst = vxlan6_get_route(vxlan, skb,
2030                                         rdst ? rdst->remote_ifindex : 0,
2031                                         &dst->sin6.sin6_addr, &saddr,
2032                                         rdst ? &rdst->dst_cache : NULL);
2033                 if (IS_ERR(ndst)) {
2034                         netdev_dbg(dev, "no route to %pI6\n",
2035                                    &dst->sin6.sin6_addr);
2036                         dev->stats.tx_carrier_errors++;
2037                         goto tx_error;
2038                 }
2039
2040                 if (ndst->dev == dev) {
2041                         netdev_dbg(dev, "circular route to %pI6\n",
2042                                    &dst->sin6.sin6_addr);
2043                         dst_release(ndst);
2044                         dev->stats.collisions++;
2045                         goto tx_error;
2046                 }
2047
2048                 /* Bypass encapsulation if the destination is local */
2049                 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2050                 if (rt6i_flags & RTF_LOCAL &&
2051                     !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2052                         struct vxlan_dev *dst_vxlan;
2053
2054                         dst_release(ndst);
2055                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2056                                                    dst->sa.sa_family, dst_port,
2057                                                    vxlan->flags);
2058                         if (!dst_vxlan)
2059                                 goto tx_error;
2060                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2061                         return;
2062                 }
2063
2064                 if (!info)
2065                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2066
2067                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2068                 skb_scrub_packet(skb, xnet);
2069                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2070                                       htonl(vni << 8), md, flags, udp_sum);
2071                 if (err < 0) {
2072                         dst_release(ndst);
2073                         return;
2074                 }
2075                 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2076                                      &saddr, &dst->sin6.sin6_addr,
2077                                      0, ttl, src_port, dst_port, !udp_sum);
2078 #endif
2079         }
2080
2081         return;
2082
2083 drop:
2084         dev->stats.tx_dropped++;
2085         goto tx_free;
2086
2087 xmit_tx_error:
2088         /* skb is already freed. */
2089         skb = NULL;
2090 rt_tx_error:
2091         ip_rt_put(rt);
2092 tx_error:
2093         dev->stats.tx_errors++;
2094 tx_free:
2095         dev_kfree_skb(skb);
2096 }
2097
2098 /* Transmit local packets over Vxlan
2099  *
2100  * Outer IP header inherits ECN and DF from inner header.
2101  * Outer UDP destination is the VXLAN assigned port.
2102  *           source port is based on hash of flow
2103  */
2104 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2105 {
2106         struct vxlan_dev *vxlan = netdev_priv(dev);
2107         const struct ip_tunnel_info *info;
2108         struct ethhdr *eth;
2109         bool did_rsc = false;
2110         struct vxlan_rdst *rdst, *fdst = NULL;
2111         struct vxlan_fdb *f;
2112
2113         info = skb_tunnel_info(skb);
2114
2115         skb_reset_mac_header(skb);
2116         eth = eth_hdr(skb);
2117
2118         if ((vxlan->flags & VXLAN_F_PROXY)) {
2119                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2120                         return arp_reduce(dev, skb);
2121 #if IS_ENABLED(CONFIG_IPV6)
2122                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2123                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2124                                        + sizeof(struct nd_msg)) &&
2125                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2126                                 struct nd_msg *msg;
2127
2128                                 msg = (struct nd_msg *)skb_transport_header(skb);
2129                                 if (msg->icmph.icmp6_code == 0 &&
2130                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2131                                         return neigh_reduce(dev, skb);
2132                 }
2133                 eth = eth_hdr(skb);
2134 #endif
2135         }
2136
2137         if (vxlan->flags & VXLAN_F_COLLECT_METADATA &&
2138             info && info->mode & IP_TUNNEL_INFO_TX) {
2139                 vxlan_xmit_one(skb, dev, NULL, false);
2140                 return NETDEV_TX_OK;
2141         }
2142
2143         f = vxlan_find_mac(vxlan, eth->h_dest);
2144         did_rsc = false;
2145
2146         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2147             (ntohs(eth->h_proto) == ETH_P_IP ||
2148              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2149                 did_rsc = route_shortcircuit(dev, skb);
2150                 if (did_rsc)
2151                         f = vxlan_find_mac(vxlan, eth->h_dest);
2152         }
2153
2154         if (f == NULL) {
2155                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2156                 if (f == NULL) {
2157                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2158                             !is_multicast_ether_addr(eth->h_dest))
2159                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2160
2161                         dev->stats.tx_dropped++;
2162                         kfree_skb(skb);
2163                         return NETDEV_TX_OK;
2164                 }
2165         }
2166
2167         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2168                 struct sk_buff *skb1;
2169
2170                 if (!fdst) {
2171                         fdst = rdst;
2172                         continue;
2173                 }
2174                 skb1 = skb_clone(skb, GFP_ATOMIC);
2175                 if (skb1)
2176                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2177         }
2178
2179         if (fdst)
2180                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2181         else
2182                 kfree_skb(skb);
2183         return NETDEV_TX_OK;
2184 }
2185
2186 /* Walk the forwarding table and purge stale entries */
2187 static void vxlan_cleanup(unsigned long arg)
2188 {
2189         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2190         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2191         unsigned int h;
2192
2193         if (!netif_running(vxlan->dev))
2194                 return;
2195
2196         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2197                 struct hlist_node *p, *n;
2198
2199                 spin_lock_bh(&vxlan->hash_lock);
2200                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2201                         struct vxlan_fdb *f
2202                                 = container_of(p, struct vxlan_fdb, hlist);
2203                         unsigned long timeout;
2204
2205                         if (f->state & NUD_PERMANENT)
2206                                 continue;
2207
2208                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2209                         if (time_before_eq(timeout, jiffies)) {
2210                                 netdev_dbg(vxlan->dev,
2211                                            "garbage collect %pM\n",
2212                                            f->eth_addr);
2213                                 f->state = NUD_STALE;
2214                                 vxlan_fdb_destroy(vxlan, f);
2215                         } else if (time_before(timeout, next_timer))
2216                                 next_timer = timeout;
2217                 }
2218                 spin_unlock_bh(&vxlan->hash_lock);
2219         }
2220
2221         mod_timer(&vxlan->age_timer, next_timer);
2222 }
2223
2224 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2225 {
2226         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2227         __u32 vni = vxlan->default_dst.remote_vni;
2228
2229         spin_lock(&vn->sock_lock);
2230         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2231         spin_unlock(&vn->sock_lock);
2232 }
2233
2234 /* Setup stats when device is created */
2235 static int vxlan_init(struct net_device *dev)
2236 {
2237         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2238         if (!dev->tstats)
2239                 return -ENOMEM;
2240
2241         return 0;
2242 }
2243
2244 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2245 {
2246         struct vxlan_fdb *f;
2247
2248         spin_lock_bh(&vxlan->hash_lock);
2249         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2250         if (f)
2251                 vxlan_fdb_destroy(vxlan, f);
2252         spin_unlock_bh(&vxlan->hash_lock);
2253 }
2254
2255 static void vxlan_uninit(struct net_device *dev)
2256 {
2257         struct vxlan_dev *vxlan = netdev_priv(dev);
2258
2259         vxlan_fdb_delete_default(vxlan);
2260
2261         free_percpu(dev->tstats);
2262 }
2263
2264 /* Start ageing timer and join group when device is brought up */
2265 static int vxlan_open(struct net_device *dev)
2266 {
2267         struct vxlan_dev *vxlan = netdev_priv(dev);
2268         int ret;
2269
2270         ret = vxlan_sock_add(vxlan);
2271         if (ret < 0)
2272                 return ret;
2273
2274         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2275                 ret = vxlan_igmp_join(vxlan);
2276                 if (ret == -EADDRINUSE)
2277                         ret = 0;
2278                 if (ret) {
2279                         vxlan_sock_release(vxlan);
2280                         return ret;
2281                 }
2282         }
2283
2284         if (vxlan->cfg.age_interval)
2285                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2286
2287         return ret;
2288 }
2289
2290 /* Purge the forwarding table */
2291 static void vxlan_flush(struct vxlan_dev *vxlan)
2292 {
2293         unsigned int h;
2294
2295         spin_lock_bh(&vxlan->hash_lock);
2296         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2297                 struct hlist_node *p, *n;
2298                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2299                         struct vxlan_fdb *f
2300                                 = container_of(p, struct vxlan_fdb, hlist);
2301                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2302                         if (!is_zero_ether_addr(f->eth_addr))
2303                                 vxlan_fdb_destroy(vxlan, f);
2304                 }
2305         }
2306         spin_unlock_bh(&vxlan->hash_lock);
2307 }
2308
2309 /* Cleanup timer and forwarding table on shutdown */
2310 static int vxlan_stop(struct net_device *dev)
2311 {
2312         struct vxlan_dev *vxlan = netdev_priv(dev);
2313         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2314         int ret = 0;
2315
2316         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2317             !vxlan_group_used(vn, vxlan))
2318                 ret = vxlan_igmp_leave(vxlan);
2319
2320         del_timer_sync(&vxlan->age_timer);
2321
2322         vxlan_flush(vxlan);
2323         vxlan_sock_release(vxlan);
2324
2325         return ret;
2326 }
2327
2328 /* Stub, nothing needs to be done. */
2329 static void vxlan_set_multicast_list(struct net_device *dev)
2330 {
2331 }
2332
2333 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2334 {
2335         struct vxlan_dev *vxlan = netdev_priv(dev);
2336         struct vxlan_rdst *dst = &vxlan->default_dst;
2337         struct net_device *lowerdev;
2338         int max_mtu;
2339
2340         lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2341         if (lowerdev == NULL)
2342                 return eth_change_mtu(dev, new_mtu);
2343
2344         if (dst->remote_ip.sa.sa_family == AF_INET6)
2345                 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2346         else
2347                 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2348
2349         if (new_mtu < 68 || new_mtu > max_mtu)
2350                 return -EINVAL;
2351
2352         dev->mtu = new_mtu;
2353         return 0;
2354 }
2355
2356 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2357 {
2358         struct vxlan_dev *vxlan = netdev_priv(dev);
2359         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2360         __be16 sport, dport;
2361
2362         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2363                                   vxlan->cfg.port_max, true);
2364         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2365
2366         if (ip_tunnel_info_af(info) == AF_INET) {
2367                 struct rtable *rt;
2368
2369                 if (!vxlan->vn4_sock)
2370                         return -EINVAL;
2371                 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2372                                      info->key.u.ipv4.dst,
2373                                      &info->key.u.ipv4.src, NULL, info);
2374                 if (IS_ERR(rt))
2375                         return PTR_ERR(rt);
2376                 ip_rt_put(rt);
2377         } else {
2378 #if IS_ENABLED(CONFIG_IPV6)
2379                 struct dst_entry *ndst;
2380
2381                 if (!vxlan->vn6_sock)
2382                         return -EINVAL;
2383                 ndst = vxlan6_get_route(vxlan, skb, 0,
2384                                         &info->key.u.ipv6.dst,
2385                                         &info->key.u.ipv6.src, NULL);
2386                 if (IS_ERR(ndst))
2387                         return PTR_ERR(ndst);
2388                 dst_release(ndst);
2389 #else /* !CONFIG_IPV6 */
2390                 return -EPFNOSUPPORT;
2391 #endif
2392         }
2393         info->key.tp_src = sport;
2394         info->key.tp_dst = dport;
2395         return 0;
2396 }
2397
2398 static const struct net_device_ops vxlan_netdev_ops = {
2399         .ndo_init               = vxlan_init,
2400         .ndo_uninit             = vxlan_uninit,
2401         .ndo_open               = vxlan_open,
2402         .ndo_stop               = vxlan_stop,
2403         .ndo_start_xmit         = vxlan_xmit,
2404         .ndo_get_stats64        = ip_tunnel_get_stats64,
2405         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2406         .ndo_change_mtu         = vxlan_change_mtu,
2407         .ndo_validate_addr      = eth_validate_addr,
2408         .ndo_set_mac_address    = eth_mac_addr,
2409         .ndo_fdb_add            = vxlan_fdb_add,
2410         .ndo_fdb_del            = vxlan_fdb_delete,
2411         .ndo_fdb_dump           = vxlan_fdb_dump,
2412         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2413 };
2414
2415 /* Info for udev, that this is a virtual tunnel endpoint */
2416 static struct device_type vxlan_type = {
2417         .name = "vxlan",
2418 };
2419
2420 /* Calls the ndo_add_vxlan_port of the caller in order to
2421  * supply the listening VXLAN udp ports. Callers are expected
2422  * to implement the ndo_add_vxlan_port.
2423  */
2424 void vxlan_get_rx_port(struct net_device *dev)
2425 {
2426         struct vxlan_sock *vs;
2427         struct net *net = dev_net(dev);
2428         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2429         sa_family_t sa_family;
2430         __be16 port;
2431         unsigned int i;
2432
2433         spin_lock(&vn->sock_lock);
2434         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2435                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2436                         port = inet_sk(vs->sock->sk)->inet_sport;
2437                         sa_family = vxlan_get_sk_family(vs);
2438                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2439                                                             port);
2440                 }
2441         }
2442         spin_unlock(&vn->sock_lock);
2443 }
2444 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2445
2446 /* Initialize the device structure. */
2447 static void vxlan_setup(struct net_device *dev)
2448 {
2449         struct vxlan_dev *vxlan = netdev_priv(dev);
2450         unsigned int h;
2451
2452         eth_hw_addr_random(dev);
2453         ether_setup(dev);
2454
2455         dev->netdev_ops = &vxlan_netdev_ops;
2456         dev->destructor = free_netdev;
2457         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2458
2459         dev->features   |= NETIF_F_LLTX;
2460         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2461         dev->features   |= NETIF_F_RXCSUM;
2462         dev->features   |= NETIF_F_GSO_SOFTWARE;
2463
2464         dev->vlan_features = dev->features;
2465         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2466         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2467         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2468         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2469         netif_keep_dst(dev);
2470         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2471
2472         INIT_LIST_HEAD(&vxlan->next);
2473         spin_lock_init(&vxlan->hash_lock);
2474
2475         init_timer_deferrable(&vxlan->age_timer);
2476         vxlan->age_timer.function = vxlan_cleanup;
2477         vxlan->age_timer.data = (unsigned long) vxlan;
2478
2479         vxlan->cfg.dst_port = htons(vxlan_port);
2480
2481         vxlan->dev = dev;
2482
2483         gro_cells_init(&vxlan->gro_cells, dev);
2484
2485         for (h = 0; h < FDB_HASH_SIZE; ++h)
2486                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2487 }
2488
2489 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2490         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2491         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2492         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2493         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2494         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2495         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2496         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2497         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2498         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2499         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2500         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2501         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2502         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2503         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2504         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2505         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2506         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2507         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2508         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2509         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2510         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2511         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2512         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2513         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2514         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2515 };
2516
2517 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2518 {
2519         if (tb[IFLA_ADDRESS]) {
2520                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2521                         pr_debug("invalid link address (not ethernet)\n");
2522                         return -EINVAL;
2523                 }
2524
2525                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2526                         pr_debug("invalid all zero ethernet address\n");
2527                         return -EADDRNOTAVAIL;
2528                 }
2529         }
2530
2531         if (!data)
2532                 return -EINVAL;
2533
2534         if (data[IFLA_VXLAN_ID]) {
2535                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2536                 if (id >= VXLAN_VID_MASK)
2537                         return -ERANGE;
2538         }
2539
2540         if (data[IFLA_VXLAN_PORT_RANGE]) {
2541                 const struct ifla_vxlan_port_range *p
2542                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2543
2544                 if (ntohs(p->high) < ntohs(p->low)) {
2545                         pr_debug("port range %u .. %u not valid\n",
2546                                  ntohs(p->low), ntohs(p->high));
2547                         return -EINVAL;
2548                 }
2549         }
2550
2551         return 0;
2552 }
2553
2554 static void vxlan_get_drvinfo(struct net_device *netdev,
2555                               struct ethtool_drvinfo *drvinfo)
2556 {
2557         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2558         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2559 }
2560
2561 static const struct ethtool_ops vxlan_ethtool_ops = {
2562         .get_drvinfo    = vxlan_get_drvinfo,
2563         .get_link       = ethtool_op_get_link,
2564 };
2565
2566 static void vxlan_del_work(struct work_struct *work)
2567 {
2568         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2569         udp_tunnel_sock_release(vs->sock);
2570         kfree_rcu(vs, rcu);
2571 }
2572
2573 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2574                                         __be16 port, u32 flags)
2575 {
2576         struct socket *sock;
2577         struct udp_port_cfg udp_conf;
2578         int err;
2579
2580         memset(&udp_conf, 0, sizeof(udp_conf));
2581
2582         if (ipv6) {
2583                 udp_conf.family = AF_INET6;
2584                 udp_conf.use_udp6_rx_checksums =
2585                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2586                 udp_conf.ipv6_v6only = 1;
2587         } else {
2588                 udp_conf.family = AF_INET;
2589         }
2590
2591         udp_conf.local_udp_port = port;
2592
2593         /* Open UDP socket */
2594         err = udp_sock_create(net, &udp_conf, &sock);
2595         if (err < 0)
2596                 return ERR_PTR(err);
2597
2598         return sock;
2599 }
2600
2601 /* Create new listen socket if needed */
2602 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2603                                               __be16 port, u32 flags)
2604 {
2605         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2606         struct vxlan_sock *vs;
2607         struct socket *sock;
2608         unsigned int h;
2609         struct udp_tunnel_sock_cfg tunnel_cfg;
2610
2611         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2612         if (!vs)
2613                 return ERR_PTR(-ENOMEM);
2614
2615         for (h = 0; h < VNI_HASH_SIZE; ++h)
2616                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2617
2618         INIT_WORK(&vs->del_work, vxlan_del_work);
2619
2620         sock = vxlan_create_sock(net, ipv6, port, flags);
2621         if (IS_ERR(sock)) {
2622                 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2623                         PTR_ERR(sock));
2624                 kfree(vs);
2625                 return ERR_CAST(sock);
2626         }
2627
2628         vs->sock = sock;
2629         atomic_set(&vs->refcnt, 1);
2630         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2631
2632         /* Initialize the vxlan udp offloads structure */
2633         vs->udp_offloads.port = port;
2634         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2635         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2636
2637         spin_lock(&vn->sock_lock);
2638         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2639         vxlan_notify_add_rx_port(vs);
2640         spin_unlock(&vn->sock_lock);
2641
2642         /* Mark socket as an encapsulation socket. */
2643         tunnel_cfg.sk_user_data = vs;
2644         tunnel_cfg.encap_type = 1;
2645         tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2646         tunnel_cfg.encap_destroy = NULL;
2647
2648         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2649
2650         return vs;
2651 }
2652
2653 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2654 {
2655         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2656         struct vxlan_sock *vs = NULL;
2657
2658         if (!vxlan->cfg.no_share) {
2659                 spin_lock(&vn->sock_lock);
2660                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2661                                      vxlan->cfg.dst_port, vxlan->flags);
2662                 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2663                         spin_unlock(&vn->sock_lock);
2664                         return -EBUSY;
2665                 }
2666                 spin_unlock(&vn->sock_lock);
2667         }
2668         if (!vs)
2669                 vs = vxlan_socket_create(vxlan->net, ipv6,
2670                                          vxlan->cfg.dst_port, vxlan->flags);
2671         if (IS_ERR(vs))
2672                 return PTR_ERR(vs);
2673 #if IS_ENABLED(CONFIG_IPV6)
2674         if (ipv6)
2675                 vxlan->vn6_sock = vs;
2676         else
2677 #endif
2678                 vxlan->vn4_sock = vs;
2679         vxlan_vs_add_dev(vs, vxlan);
2680         return 0;
2681 }
2682
2683 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2684 {
2685         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2686         bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2687         int ret = 0;
2688
2689         vxlan->vn4_sock = NULL;
2690 #if IS_ENABLED(CONFIG_IPV6)
2691         vxlan->vn6_sock = NULL;
2692         if (ipv6 || metadata)
2693                 ret = __vxlan_sock_add(vxlan, true);
2694 #endif
2695         if (!ret && (!ipv6 || metadata))
2696                 ret = __vxlan_sock_add(vxlan, false);
2697         if (ret < 0)
2698                 vxlan_sock_release(vxlan);
2699         return ret;
2700 }
2701
2702 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2703                                struct vxlan_config *conf)
2704 {
2705         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2706         struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2707         struct vxlan_rdst *dst = &vxlan->default_dst;
2708         unsigned short needed_headroom = ETH_HLEN;
2709         int err;
2710         bool use_ipv6 = false;
2711         __be16 default_port = vxlan->cfg.dst_port;
2712
2713         vxlan->net = src_net;
2714
2715         dst->remote_vni = conf->vni;
2716
2717         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2718
2719         /* Unless IPv6 is explicitly requested, assume IPv4 */
2720         if (!dst->remote_ip.sa.sa_family)
2721                 dst->remote_ip.sa.sa_family = AF_INET;
2722
2723         if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2724             vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2725                 if (!IS_ENABLED(CONFIG_IPV6))
2726                         return -EPFNOSUPPORT;
2727                 use_ipv6 = true;
2728                 vxlan->flags |= VXLAN_F_IPV6;
2729         }
2730
2731         if (conf->remote_ifindex) {
2732                 struct net_device *lowerdev
2733                          = __dev_get_by_index(src_net, conf->remote_ifindex);
2734
2735                 dst->remote_ifindex = conf->remote_ifindex;
2736
2737                 if (!lowerdev) {
2738                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2739                         return -ENODEV;
2740                 }
2741
2742 #if IS_ENABLED(CONFIG_IPV6)
2743                 if (use_ipv6) {
2744                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2745                         if (idev && idev->cnf.disable_ipv6) {
2746                                 pr_info("IPv6 is disabled via sysctl\n");
2747                                 return -EPERM;
2748                         }
2749                 }
2750 #endif
2751
2752                 if (!conf->mtu)
2753                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2754
2755                 needed_headroom = lowerdev->hard_header_len;
2756         }
2757
2758         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2759                 needed_headroom += VXLAN6_HEADROOM;
2760         else
2761                 needed_headroom += VXLAN_HEADROOM;
2762         dev->needed_headroom = needed_headroom;
2763
2764         memcpy(&vxlan->cfg, conf, sizeof(*conf));
2765         if (!vxlan->cfg.dst_port)
2766                 vxlan->cfg.dst_port = default_port;
2767         vxlan->flags |= conf->flags;
2768
2769         if (!vxlan->cfg.age_interval)
2770                 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2771
2772         list_for_each_entry(tmp, &vn->vxlan_list, next) {
2773                 if (tmp->cfg.vni == conf->vni &&
2774                     (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2775                      tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2776                     tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2777                     (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2778                     (vxlan->flags & VXLAN_F_RCV_FLAGS))
2779                 return -EEXIST;
2780         }
2781
2782         dev->ethtool_ops = &vxlan_ethtool_ops;
2783
2784         /* create an fdb entry for a valid default destination */
2785         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2786                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2787                                        &vxlan->default_dst.remote_ip,
2788                                        NUD_REACHABLE|NUD_PERMANENT,
2789                                        NLM_F_EXCL|NLM_F_CREATE,
2790                                        vxlan->cfg.dst_port,
2791                                        vxlan->default_dst.remote_vni,
2792                                        vxlan->default_dst.remote_ifindex,
2793                                        NTF_SELF);
2794                 if (err)
2795                         return err;
2796         }
2797
2798         err = register_netdevice(dev);
2799         if (err) {
2800                 vxlan_fdb_delete_default(vxlan);
2801                 return err;
2802         }
2803
2804         list_add(&vxlan->next, &vn->vxlan_list);
2805
2806         return 0;
2807 }
2808
2809 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2810                                     u8 name_assign_type, struct vxlan_config *conf)
2811 {
2812         struct nlattr *tb[IFLA_MAX+1];
2813         struct net_device *dev;
2814         int err;
2815
2816         memset(&tb, 0, sizeof(tb));
2817
2818         dev = rtnl_create_link(net, name, name_assign_type,
2819                                &vxlan_link_ops, tb);
2820         if (IS_ERR(dev))
2821                 return dev;
2822
2823         err = vxlan_dev_configure(net, dev, conf);
2824         if (err < 0) {
2825                 free_netdev(dev);
2826                 return ERR_PTR(err);
2827         }
2828
2829         return dev;
2830 }
2831 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2832
2833 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2834                          struct nlattr *tb[], struct nlattr *data[])
2835 {
2836         struct vxlan_config conf;
2837         int err;
2838
2839         memset(&conf, 0, sizeof(conf));
2840
2841         if (data[IFLA_VXLAN_ID])
2842                 conf.vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2843
2844         if (data[IFLA_VXLAN_GROUP]) {
2845                 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2846         } else if (data[IFLA_VXLAN_GROUP6]) {
2847                 if (!IS_ENABLED(CONFIG_IPV6))
2848                         return -EPFNOSUPPORT;
2849
2850                 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2851                 conf.remote_ip.sa.sa_family = AF_INET6;
2852         }
2853
2854         if (data[IFLA_VXLAN_LOCAL]) {
2855                 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2856                 conf.saddr.sa.sa_family = AF_INET;
2857         } else if (data[IFLA_VXLAN_LOCAL6]) {
2858                 if (!IS_ENABLED(CONFIG_IPV6))
2859                         return -EPFNOSUPPORT;
2860
2861                 /* TODO: respect scope id */
2862                 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2863                 conf.saddr.sa.sa_family = AF_INET6;
2864         }
2865
2866         if (data[IFLA_VXLAN_LINK])
2867                 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2868
2869         if (data[IFLA_VXLAN_TOS])
2870                 conf.tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2871
2872         if (data[IFLA_VXLAN_TTL])
2873                 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2874
2875         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2876                 conf.flags |= VXLAN_F_LEARN;
2877
2878         if (data[IFLA_VXLAN_AGEING])
2879                 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2880
2881         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2882                 conf.flags |= VXLAN_F_PROXY;
2883
2884         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2885                 conf.flags |= VXLAN_F_RSC;
2886
2887         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2888                 conf.flags |= VXLAN_F_L2MISS;
2889
2890         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2891                 conf.flags |= VXLAN_F_L3MISS;
2892
2893         if (data[IFLA_VXLAN_LIMIT])
2894                 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2895
2896         if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2897             nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2898                 conf.flags |= VXLAN_F_COLLECT_METADATA;
2899
2900         if (data[IFLA_VXLAN_PORT_RANGE]) {
2901                 const struct ifla_vxlan_port_range *p
2902                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2903                 conf.port_min = ntohs(p->low);
2904                 conf.port_max = ntohs(p->high);
2905         }
2906
2907         if (data[IFLA_VXLAN_PORT])
2908                 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2909
2910         if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2911                 conf.flags |= VXLAN_F_UDP_CSUM;
2912
2913         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2914             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2915                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2916
2917         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2918             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2919                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2920
2921         if (data[IFLA_VXLAN_REMCSUM_TX] &&
2922             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2923                 conf.flags |= VXLAN_F_REMCSUM_TX;
2924
2925         if (data[IFLA_VXLAN_REMCSUM_RX] &&
2926             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2927                 conf.flags |= VXLAN_F_REMCSUM_RX;
2928
2929         if (data[IFLA_VXLAN_GBP])
2930                 conf.flags |= VXLAN_F_GBP;
2931
2932         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2933                 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2934
2935         err = vxlan_dev_configure(src_net, dev, &conf);
2936         switch (err) {
2937         case -ENODEV:
2938                 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2939                 break;
2940
2941         case -EPERM:
2942                 pr_info("IPv6 is disabled via sysctl\n");
2943                 break;
2944
2945         case -EEXIST:
2946                 pr_info("duplicate VNI %u\n", conf.vni);
2947                 break;
2948         }
2949
2950         return err;
2951 }
2952
2953 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2954 {
2955         struct vxlan_dev *vxlan = netdev_priv(dev);
2956         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2957
2958         spin_lock(&vn->sock_lock);
2959         if (!hlist_unhashed(&vxlan->hlist))
2960                 hlist_del_rcu(&vxlan->hlist);
2961         spin_unlock(&vn->sock_lock);
2962
2963         gro_cells_destroy(&vxlan->gro_cells);
2964         list_del(&vxlan->next);
2965         unregister_netdevice_queue(dev, head);
2966 }
2967
2968 static size_t vxlan_get_size(const struct net_device *dev)
2969 {
2970
2971         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
2972                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2973                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2974                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2975                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
2976                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
2977                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
2978                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
2979                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
2980                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
2981                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
2982                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
2983                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2984                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2985                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2986                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2987                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2988                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2989                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2990                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2991                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2992                 0;
2993 }
2994
2995 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2996 {
2997         const struct vxlan_dev *vxlan = netdev_priv(dev);
2998         const struct vxlan_rdst *dst = &vxlan->default_dst;
2999         struct ifla_vxlan_port_range ports = {
3000                 .low =  htons(vxlan->cfg.port_min),
3001                 .high = htons(vxlan->cfg.port_max),
3002         };
3003
3004         if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
3005                 goto nla_put_failure;
3006
3007         if (!vxlan_addr_any(&dst->remote_ip)) {
3008                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3009                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3010                                             dst->remote_ip.sin.sin_addr.s_addr))
3011                                 goto nla_put_failure;
3012 #if IS_ENABLED(CONFIG_IPV6)
3013                 } else {
3014                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3015                                              &dst->remote_ip.sin6.sin6_addr))
3016                                 goto nla_put_failure;
3017 #endif
3018                 }
3019         }
3020
3021         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3022                 goto nla_put_failure;
3023
3024         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3025                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3026                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3027                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3028                                 goto nla_put_failure;
3029 #if IS_ENABLED(CONFIG_IPV6)
3030                 } else {
3031                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3032                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3033                                 goto nla_put_failure;
3034 #endif
3035                 }
3036         }
3037
3038         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3039             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3040             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3041                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
3042             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3043                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
3044             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3045             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3046                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3047             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3048                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3049             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3050                        !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3051             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3052             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3053             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3054             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3055                         !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
3056             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3057                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3058             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3059                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3060             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3061                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3062             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3063                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3064                 goto nla_put_failure;
3065
3066         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3067                 goto nla_put_failure;
3068
3069         if (vxlan->flags & VXLAN_F_GBP &&
3070             nla_put_flag(skb, IFLA_VXLAN_GBP))
3071                 goto nla_put_failure;
3072
3073         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3074             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3075                 goto nla_put_failure;
3076
3077         return 0;
3078
3079 nla_put_failure:
3080         return -EMSGSIZE;
3081 }
3082
3083 static struct net *vxlan_get_link_net(const struct net_device *dev)
3084 {
3085         struct vxlan_dev *vxlan = netdev_priv(dev);
3086
3087         return vxlan->net;
3088 }
3089
3090 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3091         .kind           = "vxlan",
3092         .maxtype        = IFLA_VXLAN_MAX,
3093         .policy         = vxlan_policy,
3094         .priv_size      = sizeof(struct vxlan_dev),
3095         .setup          = vxlan_setup,
3096         .validate       = vxlan_validate,
3097         .newlink        = vxlan_newlink,
3098         .dellink        = vxlan_dellink,
3099         .get_size       = vxlan_get_size,
3100         .fill_info      = vxlan_fill_info,
3101         .get_link_net   = vxlan_get_link_net,
3102 };
3103
3104 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3105                                              struct net_device *dev)
3106 {
3107         struct vxlan_dev *vxlan, *next;
3108         LIST_HEAD(list_kill);
3109
3110         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3111                 struct vxlan_rdst *dst = &vxlan->default_dst;
3112
3113                 /* In case we created vxlan device with carrier
3114                  * and we loose the carrier due to module unload
3115                  * we also need to remove vxlan device. In other
3116                  * cases, it's not necessary and remote_ifindex
3117                  * is 0 here, so no matches.
3118                  */
3119                 if (dst->remote_ifindex == dev->ifindex)
3120                         vxlan_dellink(vxlan->dev, &list_kill);
3121         }
3122
3123         unregister_netdevice_many(&list_kill);
3124 }
3125
3126 static int vxlan_lowerdev_event(struct notifier_block *unused,
3127                                 unsigned long event, void *ptr)
3128 {
3129         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3130         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3131
3132         if (event == NETDEV_UNREGISTER)
3133                 vxlan_handle_lowerdev_unregister(vn, dev);
3134
3135         return NOTIFY_DONE;
3136 }
3137
3138 static struct notifier_block vxlan_notifier_block __read_mostly = {
3139         .notifier_call = vxlan_lowerdev_event,
3140 };
3141
3142 static __net_init int vxlan_init_net(struct net *net)
3143 {
3144         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3145         unsigned int h;
3146
3147         INIT_LIST_HEAD(&vn->vxlan_list);
3148         spin_lock_init(&vn->sock_lock);
3149
3150         for (h = 0; h < PORT_HASH_SIZE; ++h)
3151                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3152
3153         return 0;
3154 }
3155
3156 static void __net_exit vxlan_exit_net(struct net *net)
3157 {
3158         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3159         struct vxlan_dev *vxlan, *next;
3160         struct net_device *dev, *aux;
3161         LIST_HEAD(list);
3162
3163         rtnl_lock();
3164         for_each_netdev_safe(net, dev, aux)
3165                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3166                         unregister_netdevice_queue(dev, &list);
3167
3168         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3169                 /* If vxlan->dev is in the same netns, it has already been added
3170                  * to the list by the previous loop.
3171                  */
3172                 if (!net_eq(dev_net(vxlan->dev), net)) {
3173                         gro_cells_destroy(&vxlan->gro_cells);
3174                         unregister_netdevice_queue(vxlan->dev, &list);
3175                 }
3176         }
3177
3178         unregister_netdevice_many(&list);
3179         rtnl_unlock();
3180 }
3181
3182 static struct pernet_operations vxlan_net_ops = {
3183         .init = vxlan_init_net,
3184         .exit = vxlan_exit_net,
3185         .id   = &vxlan_net_id,
3186         .size = sizeof(struct vxlan_net),
3187 };
3188
3189 static int __init vxlan_init_module(void)
3190 {
3191         int rc;
3192
3193         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3194         if (!vxlan_wq)
3195                 return -ENOMEM;
3196
3197         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3198
3199         rc = register_pernet_subsys(&vxlan_net_ops);
3200         if (rc)
3201                 goto out1;
3202
3203         rc = register_netdevice_notifier(&vxlan_notifier_block);
3204         if (rc)
3205                 goto out2;
3206
3207         rc = rtnl_link_register(&vxlan_link_ops);
3208         if (rc)
3209                 goto out3;
3210
3211         return 0;
3212 out3:
3213         unregister_netdevice_notifier(&vxlan_notifier_block);
3214 out2:
3215         unregister_pernet_subsys(&vxlan_net_ops);
3216 out1:
3217         destroy_workqueue(vxlan_wq);
3218         return rc;
3219 }
3220 late_initcall(vxlan_init_module);
3221
3222 static void __exit vxlan_cleanup_module(void)
3223 {
3224         rtnl_link_unregister(&vxlan_link_ops);
3225         unregister_netdevice_notifier(&vxlan_notifier_block);
3226         destroy_workqueue(vxlan_wq);
3227         unregister_pernet_subsys(&vxlan_net_ops);
3228         /* rcu_barrier() is called by netns */
3229 }
3230 module_exit(vxlan_cleanup_module);
3231
3232 MODULE_LICENSE("GPL");
3233 MODULE_VERSION(VXLAN_VERSION);
3234 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3235 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3236 MODULE_ALIAS_RTNL_LINK("vxlan");