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, __be32 vni)
 201 {
 202         return &vs->vni_list[hash_32((__force u32)vni, 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, __be32 vni)
 246 {
 247         struct vxlan_dev *vxlan;
 248
 249         /* For flow based devices, map all packets to VNI 0 */
 250         if (vs->flags & VXLAN_F_COLLECT_METADATA)
 251                 vni = 0;
 252
 253         hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
 254                 if (vxlan->default_dst.remote_vni == vni)
 255                         return vxlan;
 256         }
 257
 258         return NULL;
 259 }
 260
 261 /* Look up VNI in a per net namespace table */
 262 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
 263                                         sa_family_t family, __be16 port,
 264                                         u32 flags)
 265 {
 266         struct vxlan_sock *vs;
 267
 268         vs = vxlan_find_sock(net, family, port, flags);
 269         if (!vs)
 270                 return NULL;
 271
 272         return vxlan_vs_find_vni(vs, vni);
 273 }
 274
 275 /* Fill in neighbour message in skbuff. */
 276 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 277                           const struct vxlan_fdb *fdb,
 278                           u32 portid, u32 seq, int type, unsigned int flags,
 279                           const struct vxlan_rdst *rdst)
 280 {
 281         unsigned long now = jiffies;
 282         struct nda_cacheinfo ci;
 283         struct nlmsghdr *nlh;
 284         struct ndmsg *ndm;
 285         bool send_ip, send_eth;
 286
 287         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 288         if (nlh == NULL)
 289                 return -EMSGSIZE;
 290
 291         ndm = nlmsg_data(nlh);
 292         memset(ndm, 0, sizeof(*ndm));
 293
 294         send_eth = send_ip = true;
 295
 296         if (type == RTM_GETNEIGH) {
 297                 ndm->ndm_family = AF_INET;
 298                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 299                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 300         } else
 301                 ndm->ndm_family = AF_BRIDGE;
 302         ndm->ndm_state = fdb->state;
 303         ndm->ndm_ifindex = vxlan->dev->ifindex;
 304         ndm->ndm_flags = fdb->flags;
 305         ndm->ndm_type = RTN_UNICAST;
 306
 307         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 308             nla_put_s32(skb, NDA_LINK_NETNSID,
 309                         peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
 310                 goto nla_put_failure;
 311
 312         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 313                 goto nla_put_failure;
 314
 315         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 316                 goto nla_put_failure;
 317
 318         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
 319             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 320                 goto nla_put_failure;
 321         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 322             nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 323                 goto nla_put_failure;
 324         if (rdst->remote_ifindex &&
 325             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 326                 goto nla_put_failure;
 327
 328         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 329         ci.ndm_confirmed = 0;
 330         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 331         ci.ndm_refcnt    = 0;
 332
 333         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 334                 goto nla_put_failure;
 335
 336         nlmsg_end(skb, nlh);
 337         return 0;
 338
 339 nla_put_failure:
 340         nlmsg_cancel(skb, nlh);
 341         return -EMSGSIZE;
 342 }
 343
 344 static inline size_t vxlan_nlmsg_size(void)
 345 {
 346         return NLMSG_ALIGN(sizeof(struct ndmsg))
 347                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 348                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 349                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 350                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 351                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 352                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 353                 + nla_total_size(sizeof(struct nda_cacheinfo));
 354 }
 355
 356 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 357                              struct vxlan_rdst *rd, int type)
 358 {
 359         struct net *net = dev_net(vxlan->dev);
 360         struct sk_buff *skb;
 361         int err = -ENOBUFS;
 362
 363         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 364         if (skb == NULL)
 365                 goto errout;
 366
 367         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 368         if (err < 0) {
 369                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 370                 WARN_ON(err == -EMSGSIZE);
 371                 kfree_skb(skb);
 372                 goto errout;
 373         }
 374
 375         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 376         return;
 377 errout:
 378         if (err < 0)
 379                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 380 }
 381
 382 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 383 {
 384         struct vxlan_dev *vxlan = netdev_priv(dev);
 385         struct vxlan_fdb f = {
 386                 .state = NUD_STALE,
 387         };
 388         struct vxlan_rdst remote = {
 389                 .remote_ip = *ipa, /* goes to NDA_DST */
 390                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 391         };
 392
 393         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 394 }
 395
 396 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 397 {
 398         struct vxlan_fdb f = {
 399                 .state = NUD_STALE,
 400         };
 401         struct vxlan_rdst remote = { };
 402
 403         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 404
 405         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 406 }
 407
 408 /* Hash Ethernet address */
 409 static u32 eth_hash(const unsigned char *addr)
 410 {
 411         u64 value = get_unaligned((u64 *)addr);
 412
 413         /* only want 6 bytes */
 414 #ifdef __BIG_ENDIAN
 415         value >>= 16;
 416 #else
 417         value <<= 16;
 418 #endif
 419         return hash_64(value, FDB_HASH_BITS);
 420 }
 421
 422 /* Hash chain to use given mac address */
 423 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 424                                                 const u8 *mac)
 425 {
 426         return &vxlan->fdb_head[eth_hash(mac)];
 427 }
 428
 429 /* Look up Ethernet address in forwarding table */
 430 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 431                                         const u8 *mac)
 432 {
 433         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 434         struct vxlan_fdb *f;
 435
 436         hlist_for_each_entry_rcu(f, head, hlist) {
 437                 if (ether_addr_equal(mac, f->eth_addr))
 438                         return f;
 439         }
 440
 441         return NULL;
 442 }
 443
 444 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 445                                         const u8 *mac)
 446 {
 447         struct vxlan_fdb *f;
 448
 449         f = __vxlan_find_mac(vxlan, mac);
 450         if (f)
 451                 f->used = jiffies;
 452
 453         return f;
 454 }
 455
 456 /* caller should hold vxlan->hash_lock */
 457 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 458                                               union vxlan_addr *ip, __be16 port,
 459                                               __be32 vni, __u32 ifindex)
 460 {
 461         struct vxlan_rdst *rd;
 462
 463         list_for_each_entry(rd, &f->remotes, list) {
 464                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 465                     rd->remote_port == port &&
 466                     rd->remote_vni == vni &&
 467                     rd->remote_ifindex == ifindex)
 468                         return rd;
 469         }
 470
 471         return NULL;
 472 }
 473
 474 /* Replace destination of unicast mac */
 475 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 476                              union vxlan_addr *ip, __be16 port, __be32 vni,
 477                              __u32 ifindex)
 478 {
 479         struct vxlan_rdst *rd;
 480
 481         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 482         if (rd)
 483                 return 0;
 484
 485         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 486         if (!rd)
 487                 return 0;
 488
 489         dst_cache_reset(&rd->dst_cache);
 490         rd->remote_ip = *ip;
 491         rd->remote_port = port;
 492         rd->remote_vni = vni;
 493         rd->remote_ifindex = ifindex;
 494         return 1;
 495 }
 496
 497 /* Add/update destinations for multicast */
 498 static int vxlan_fdb_append(struct vxlan_fdb *f,
 499                             union vxlan_addr *ip, __be16 port, __be32 vni,
 500                             __u32 ifindex, struct vxlan_rdst **rdp)
 501 {
 502         struct vxlan_rdst *rd;
 503
 504         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 505         if (rd)
 506                 return 0;
 507
 508         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 509         if (rd == NULL)
 510                 return -ENOBUFS;
 511
 512         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 513                 kfree(rd);
 514                 return -ENOBUFS;
 515         }
 516
 517         rd->remote_ip = *ip;
 518         rd->remote_port = port;
 519         rd->remote_vni = vni;
 520         rd->remote_ifindex = ifindex;
 521
 522         list_add_tail_rcu(&rd->list, &f->remotes);
 523
 524         *rdp = rd;
 525         return 1;
 526 }
 527
 528 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 529                                           unsigned int off,
 530                                           struct vxlanhdr *vh, size_t hdrlen,
 531                                           __be32 vni_field,
 532                                           struct gro_remcsum *grc,
 533                                           bool nopartial)
 534 {
 535         size_t start, offset;
 536
 537         if (skb->remcsum_offload)
 538                 return vh;
 539
 540         if (!NAPI_GRO_CB(skb)->csum_valid)
 541                 return NULL;
 542
 543         start = vxlan_rco_start(vni_field);
 544         offset = start + vxlan_rco_offset(vni_field);
 545
 546         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 547                                      start, offset, grc, nopartial);
 548
 549         skb->remcsum_offload = 1;
 550
 551         return vh;
 552 }
 553
 554 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
 555                                           struct sk_buff **head,
 556                                           struct sk_buff *skb)
 557 {
 558         struct sk_buff *p, **pp = NULL;
 559         struct vxlanhdr *vh, *vh2;
 560         unsigned int hlen, off_vx;
 561         int flush = 1;
 562         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
 563         __be32 flags;
 564         struct gro_remcsum grc;
 565
 566         skb_gro_remcsum_init(&grc);
 567
 568         off_vx = skb_gro_offset(skb);
 569         hlen = off_vx + sizeof(*vh);
 570         vh   = skb_gro_header_fast(skb, off_vx);
 571         if (skb_gro_header_hard(skb, hlen)) {
 572                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 573                 if (unlikely(!vh))
 574                         goto out;
 575         }
 576
 577         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 578
 579         flags = vh->vx_flags;
 580
 581         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 582                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 583                                        vh->vx_vni, &grc,
 584                                        !!(vs->flags &
 585                                           VXLAN_F_REMCSUM_NOPARTIAL));
 586
 587                 if (!vh)
 588                         goto out;
 589         }
 590
 591         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 592
 593         for (p = *head; p; p = p->next) {
 594                 if (!NAPI_GRO_CB(p)->same_flow)
 595                         continue;
 596
 597                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 598                 if (vh->vx_flags != vh2->vx_flags ||
 599                     vh->vx_vni != vh2->vx_vni) {
 600                         NAPI_GRO_CB(p)->same_flow = 0;
 601                         continue;
 602                 }
 603         }
 604
 605         pp = eth_gro_receive(head, skb);
 606         flush = 0;
 607
 608 out:
 609         skb_gro_remcsum_cleanup(skb, &grc);
 610         NAPI_GRO_CB(skb)->flush |= flush;
 611
 612         return pp;
 613 }
 614
 615 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 616 {
 617         udp_tunnel_gro_complete(skb, nhoff);
 618
 619         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 620 }
 621
 622 /* Notify netdevs that UDP port started listening */
 623 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
 624 {
 625         struct net_device *dev;
 626         struct sock *sk = vs->sock->sk;
 627         struct net *net = sock_net(sk);
 628         sa_family_t sa_family = vxlan_get_sk_family(vs);
 629         __be16 port = inet_sk(sk)->inet_sport;
 630
 631         rcu_read_lock();
 632         for_each_netdev_rcu(net, dev) {
 633                 if (dev->netdev_ops->ndo_add_vxlan_port)
 634                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
 635                                                             port);
 636         }
 637         rcu_read_unlock();
 638 }
 639
 640 /* Notify netdevs that UDP port is no more listening */
 641 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
 642 {
 643         struct net_device *dev;
 644         struct sock *sk = vs->sock->sk;
 645         struct net *net = sock_net(sk);
 646         sa_family_t sa_family = vxlan_get_sk_family(vs);
 647         __be16 port = inet_sk(sk)->inet_sport;
 648
 649         rcu_read_lock();
 650         for_each_netdev_rcu(net, dev) {
 651                 if (dev->netdev_ops->ndo_del_vxlan_port)
 652                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
 653                                                             port);
 654         }
 655         rcu_read_unlock();
 656 }
 657
 658 /* Add new entry to forwarding table -- assumes lock held */
 659 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 660                             const u8 *mac, union vxlan_addr *ip,
 661                             __u16 state, __u16 flags,
 662                             __be16 port, __be32 vni, __u32 ifindex,
 663                             __u8 ndm_flags)
 664 {
 665         struct vxlan_rdst *rd = NULL;
 666         struct vxlan_fdb *f;
 667         int notify = 0;
 668
 669         f = __vxlan_find_mac(vxlan, mac);
 670         if (f) {
 671                 if (flags & NLM_F_EXCL) {
 672                         netdev_dbg(vxlan->dev,
 673                                    "lost race to create %pM\n", mac);
 674                         return -EEXIST;
 675                 }
 676                 if (f->state != state) {
 677                         f->state = state;
 678                         f->updated = jiffies;
 679                         notify = 1;
 680                 }
 681                 if (f->flags != ndm_flags) {
 682                         f->flags = ndm_flags;
 683                         f->updated = jiffies;
 684                         notify = 1;
 685                 }
 686                 if ((flags & NLM_F_REPLACE)) {
 687                         /* Only change unicasts */
 688                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 689                              is_zero_ether_addr(f->eth_addr))) {
 690                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
 691                                                            ifindex);
 692                         } else
 693                                 return -EOPNOTSUPP;
 694                 }
 695                 if ((flags & NLM_F_APPEND) &&
 696                     (is_multicast_ether_addr(f->eth_addr) ||
 697                      is_zero_ether_addr(f->eth_addr))) {
 698                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
 699                                                   &rd);
 700
 701                         if (rc < 0)
 702                                 return rc;
 703                         notify |= rc;
 704                 }
 705         } else {
 706                 if (!(flags & NLM_F_CREATE))
 707                         return -ENOENT;
 708
 709                 if (vxlan->cfg.addrmax &&
 710                     vxlan->addrcnt >= vxlan->cfg.addrmax)
 711                         return -ENOSPC;
 712
 713                 /* Disallow replace to add a multicast entry */
 714                 if ((flags & NLM_F_REPLACE) &&
 715                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 716                         return -EOPNOTSUPP;
 717
 718                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 719                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 720                 if (!f)
 721                         return -ENOMEM;
 722
 723                 notify = 1;
 724                 f->state = state;
 725                 f->flags = ndm_flags;
 726                 f->updated = f->used = jiffies;
 727                 INIT_LIST_HEAD(&f->remotes);
 728                 memcpy(f->eth_addr, mac, ETH_ALEN);
 729
 730                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 731
 732                 ++vxlan->addrcnt;
 733                 hlist_add_head_rcu(&f->hlist,
 734                                    vxlan_fdb_head(vxlan, mac));
 735         }
 736
 737         if (notify) {
 738                 if (rd == NULL)
 739                         rd = first_remote_rtnl(f);
 740                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 741         }
 742
 743         return 0;
 744 }
 745
 746 static void vxlan_fdb_free(struct rcu_head *head)
 747 {
 748         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 749         struct vxlan_rdst *rd, *nd;
 750
 751         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 752                 dst_cache_destroy(&rd->dst_cache);
 753                 kfree(rd);
 754         }
 755         kfree(f);
 756 }
 757
 758 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 759 {
 760         netdev_dbg(vxlan->dev,
 761                     "delete %pM\n", f->eth_addr);
 762
 763         --vxlan->addrcnt;
 764         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 765
 766         hlist_del_rcu(&f->hlist);
 767         call_rcu(&f->rcu, vxlan_fdb_free);
 768 }
 769
 770 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 771                            union vxlan_addr *ip, __be16 *port, __be32 *vni,
 772                            u32 *ifindex)
 773 {
 774         struct net *net = dev_net(vxlan->dev);
 775         int err;
 776
 777         if (tb[NDA_DST]) {
 778                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 779                 if (err)
 780                         return err;
 781         } else {
 782                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 783                 if (remote->sa.sa_family == AF_INET) {
 784                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 785                         ip->sa.sa_family = AF_INET;
 786 #if IS_ENABLED(CONFIG_IPV6)
 787                 } else {
 788                         ip->sin6.sin6_addr = in6addr_any;
 789                         ip->sa.sa_family = AF_INET6;
 790 #endif
 791                 }
 792         }
 793
 794         if (tb[NDA_PORT]) {
 795                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 796                         return -EINVAL;
 797                 *port = nla_get_be16(tb[NDA_PORT]);
 798         } else {
 799                 *port = vxlan->cfg.dst_port;
 800         }
 801
 802         if (tb[NDA_VNI]) {
 803                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 804                         return -EINVAL;
 805                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
 806         } else {
 807                 *vni = vxlan->default_dst.remote_vni;
 808         }
 809
 810         if (tb[NDA_IFINDEX]) {
 811                 struct net_device *tdev;
 812
 813                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 814                         return -EINVAL;
 815                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 816                 tdev = __dev_get_by_index(net, *ifindex);
 817                 if (!tdev)
 818                         return -EADDRNOTAVAIL;
 819         } else {
 820                 *ifindex = 0;
 821         }
 822
 823         return 0;
 824 }
 825
 826 /* Add static entry (via netlink) */
 827 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 828                          struct net_device *dev,
 829                          const unsigned char *addr, u16 vid, u16 flags)
 830 {
 831         struct vxlan_dev *vxlan = netdev_priv(dev);
 832         /* struct net *net = dev_net(vxlan->dev); */
 833         union vxlan_addr ip;
 834         __be16 port;
 835         __be32 vni;
 836         u32 ifindex;
 837         int err;
 838
 839         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 840                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 841                         ndm->ndm_state);
 842                 return -EINVAL;
 843         }
 844
 845         if (tb[NDA_DST] == NULL)
 846                 return -EINVAL;
 847
 848         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 849         if (err)
 850                 return err;
 851
 852         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 853                 return -EAFNOSUPPORT;
 854
 855         spin_lock_bh(&vxlan->hash_lock);
 856         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 857                                port, vni, ifindex, ndm->ndm_flags);
 858         spin_unlock_bh(&vxlan->hash_lock);
 859
 860         return err;
 861 }
 862
 863 /* Delete entry (via netlink) */
 864 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 865                             struct net_device *dev,
 866                             const unsigned char *addr, u16 vid)
 867 {
 868         struct vxlan_dev *vxlan = netdev_priv(dev);
 869         struct vxlan_fdb *f;
 870         struct vxlan_rdst *rd = NULL;
 871         union vxlan_addr ip;
 872         __be16 port;
 873         __be32 vni;
 874         u32 ifindex;
 875         int err;
 876
 877         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 878         if (err)
 879                 return err;
 880
 881         err = -ENOENT;
 882
 883         spin_lock_bh(&vxlan->hash_lock);
 884         f = vxlan_find_mac(vxlan, addr);
 885         if (!f)
 886                 goto out;
 887
 888         if (!vxlan_addr_any(&ip)) {
 889                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 890                 if (!rd)
 891                         goto out;
 892         }
 893
 894         err = 0;
 895
 896         /* remove a destination if it's not the only one on the list,
 897          * otherwise destroy the fdb entry
 898          */
 899         if (rd && !list_is_singular(&f->remotes)) {
 900                 list_del_rcu(&rd->list);
 901                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 902                 kfree_rcu(rd, rcu);
 903                 goto out;
 904         }
 905
 906         vxlan_fdb_destroy(vxlan, f);
 907
 908 out:
 909         spin_unlock_bh(&vxlan->hash_lock);
 910
 911         return err;
 912 }
 913
 914 /* Dump forwarding table */
 915 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 916                           struct net_device *dev,
 917                           struct net_device *filter_dev, int idx)
 918 {
 919         struct vxlan_dev *vxlan = netdev_priv(dev);
 920         unsigned int h;
 921
 922         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 923                 struct vxlan_fdb *f;
 924                 int err;
 925
 926                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 927                         struct vxlan_rdst *rd;
 928
 929                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 930                                 if (idx < cb->args[0])
 931                                         goto skip;
 932
 933                                 err = vxlan_fdb_info(skb, vxlan, f,
 934                                                      NETLINK_CB(cb->skb).portid,
 935                                                      cb->nlh->nlmsg_seq,
 936                                                      RTM_NEWNEIGH,
 937                                                      NLM_F_MULTI, rd);
 938                                 if (err < 0) {
 939                                         cb->args[1] = err;
 940                                         goto out;
 941                                 }
 942 skip:
 943                                 ++idx;
 944                         }
 945                 }
 946         }
 947 out:
 948         return idx;
 949 }
 950
 951 /* Watch incoming packets to learn mapping between Ethernet address
 952  * and Tunnel endpoint.
 953  * Return true if packet is bogus and should be dropped.
 954  */
 955 static bool vxlan_snoop(struct net_device *dev,
 956                         union vxlan_addr *src_ip, const u8 *src_mac)
 957 {
 958         struct vxlan_dev *vxlan = netdev_priv(dev);
 959         struct vxlan_fdb *f;
 960
 961         f = vxlan_find_mac(vxlan, src_mac);
 962         if (likely(f)) {
 963                 struct vxlan_rdst *rdst = first_remote_rcu(f);
 964
 965                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
 966                         return false;
 967
 968                 /* Don't migrate static entries, drop packets */
 969                 if (f->state & NUD_NOARP)
 970                         return true;
 971
 972                 if (net_ratelimit())
 973                         netdev_info(dev,
 974                                     "%pM migrated from %pIS to %pIS\n",
 975                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
 976
 977                 rdst->remote_ip = *src_ip;
 978                 f->updated = jiffies;
 979                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
 980         } else {
 981                 /* learned new entry */
 982                 spin_lock(&vxlan->hash_lock);
 983
 984                 /* close off race between vxlan_flush and incoming packets */
 985                 if (netif_running(dev))
 986                         vxlan_fdb_create(vxlan, src_mac, src_ip,
 987                                          NUD_REACHABLE,
 988                                          NLM_F_EXCL|NLM_F_CREATE,
 989                                          vxlan->cfg.dst_port,
 990                                          vxlan->default_dst.remote_vni,
 991                                          0, NTF_SELF);
 992                 spin_unlock(&vxlan->hash_lock);
 993         }
 994
 995         return false;
 996 }
 997
 998 /* See if multicast group is already in use by other ID */
 999 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1000 {
1001         struct vxlan_dev *vxlan;
1002         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1003
1004         /* The vxlan_sock is only used by dev, leaving group has
1005          * no effect on other vxlan devices.
1006          */
1007         if (family == AF_INET && dev->vn4_sock &&
1008             atomic_read(&dev->vn4_sock->refcnt) == 1)
1009                 return false;
1010 #if IS_ENABLED(CONFIG_IPV6)
1011         if (family == AF_INET6 && dev->vn6_sock &&
1012             atomic_read(&dev->vn6_sock->refcnt) == 1)
1013                 return false;
1014 #endif
1015
1016         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1017                 if (!netif_running(vxlan->dev) || vxlan == dev)
1018                         continue;
1019
1020                 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1021                         continue;
1022 #if IS_ENABLED(CONFIG_IPV6)
1023                 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1024                         continue;
1025 #endif
1026
1027                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1028                                       &dev->default_dst.remote_ip))
1029                         continue;
1030
1031                 if (vxlan->default_dst.remote_ifindex !=
1032                     dev->default_dst.remote_ifindex)
1033                         continue;
1034
1035                 return true;
1036         }
1037
1038         return false;
1039 }
1040
1041 static void __vxlan_sock_release(struct vxlan_sock *vs)
1042 {
1043         struct vxlan_net *vn;
1044
1045         if (!vs)
1046                 return;
1047         if (!atomic_dec_and_test(&vs->refcnt))
1048                 return;
1049
1050         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1051         spin_lock(&vn->sock_lock);
1052         hlist_del_rcu(&vs->hlist);
1053         vxlan_notify_del_rx_port(vs);
1054         spin_unlock(&vn->sock_lock);
1055
1056         queue_work(vxlan_wq, &vs->del_work);
1057 }
1058
1059 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1060 {
1061         __vxlan_sock_release(vxlan->vn4_sock);
1062 #if IS_ENABLED(CONFIG_IPV6)
1063         __vxlan_sock_release(vxlan->vn6_sock);
1064 #endif
1065 }
1066
1067 /* Update multicast group membership when first VNI on
1068  * multicast address is brought up
1069  */
1070 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1071 {
1072         struct sock *sk;
1073         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1074         int ifindex = vxlan->default_dst.remote_ifindex;
1075         int ret = -EINVAL;
1076
1077         if (ip->sa.sa_family == AF_INET) {
1078                 struct ip_mreqn mreq = {
1079                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1080                         .imr_ifindex            = ifindex,
1081                 };
1082
1083                 sk = vxlan->vn4_sock->sock->sk;
1084                 lock_sock(sk);
1085                 ret = ip_mc_join_group(sk, &mreq);
1086                 release_sock(sk);
1087 #if IS_ENABLED(CONFIG_IPV6)
1088         } else {
1089                 sk = vxlan->vn6_sock->sock->sk;
1090                 lock_sock(sk);
1091                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1092                                                    &ip->sin6.sin6_addr);
1093                 release_sock(sk);
1094 #endif
1095         }
1096
1097         return ret;
1098 }
1099
1100 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1101 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1102 {
1103         struct sock *sk;
1104         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1105         int ifindex = vxlan->default_dst.remote_ifindex;
1106         int ret = -EINVAL;
1107
1108         if (ip->sa.sa_family == AF_INET) {
1109                 struct ip_mreqn mreq = {
1110                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1111                         .imr_ifindex            = ifindex,
1112                 };
1113
1114                 sk = vxlan->vn4_sock->sock->sk;
1115                 lock_sock(sk);
1116                 ret = ip_mc_leave_group(sk, &mreq);
1117                 release_sock(sk);
1118 #if IS_ENABLED(CONFIG_IPV6)
1119         } else {
1120                 sk = vxlan->vn6_sock->sock->sk;
1121                 lock_sock(sk);
1122                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1123                                                    &ip->sin6.sin6_addr);
1124                 release_sock(sk);
1125 #endif
1126         }
1127
1128         return ret;
1129 }
1130
1131 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1132                           struct sk_buff *skb, u32 vxflags)
1133 {
1134         size_t start, offset;
1135
1136         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1137                 goto out;
1138
1139         start = vxlan_rco_start(unparsed->vx_vni);
1140         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1141
1142         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1143                 return false;
1144
1145         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1146                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1147 out:
1148         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1149         unparsed->vx_vni &= VXLAN_VNI_MASK;
1150         return true;
1151 }
1152
1153 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1154                                 struct sk_buff *skb, u32 vxflags,
1155                                 struct vxlan_metadata *md)
1156 {
1157         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1158         struct metadata_dst *tun_dst;
1159
1160         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1161                 goto out;
1162
1163         md->gbp = ntohs(gbp->policy_id);
1164
1165         tun_dst = (struct metadata_dst *)skb_dst(skb);
1166         if (tun_dst) {
1167                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1168                 tun_dst->u.tun_info.options_len = sizeof(*md);
1169         }
1170         if (gbp->dont_learn)
1171                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1172
1173         if (gbp->policy_applied)
1174                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1175
1176         /* In flow-based mode, GBP is carried in dst_metadata */
1177         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1178                 skb->mark = md->gbp;
1179 out:
1180         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1181 }
1182
1183 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1184                                 __be32 *protocol,
1185                                 struct sk_buff *skb, u32 vxflags)
1186 {
1187         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1188
1189         /* Need to have Next Protocol set for interfaces in GPE mode. */
1190         if (!gpe->np_applied)
1191                 return false;
1192         /* "The initial version is 0. If a receiver does not support the
1193          * version indicated it MUST drop the packet.
1194          */
1195         if (gpe->version != 0)
1196                 return false;
1197         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1198          * processing MUST occur." However, we don't implement OAM
1199          * processing, thus drop the packet.
1200          */
1201         if (gpe->oam_flag)
1202                 return false;
1203
1204         switch (gpe->next_protocol) {
1205         case VXLAN_GPE_NP_IPV4:
1206                 *protocol = htons(ETH_P_IP);
1207                 break;
1208         case VXLAN_GPE_NP_IPV6:
1209                 *protocol = htons(ETH_P_IPV6);
1210                 break;
1211         case VXLAN_GPE_NP_ETHERNET:
1212                 *protocol = htons(ETH_P_TEB);
1213                 break;
1214         default:
1215                 return false;
1216         }
1217
1218         unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1219         return true;
1220 }
1221
1222 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1223                           struct vxlan_sock *vs,
1224                           struct sk_buff *skb)
1225 {
1226         union vxlan_addr saddr;
1227
1228         skb_reset_mac_header(skb);
1229         skb->protocol = eth_type_trans(skb, vxlan->dev);
1230         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1231
1232         /* Ignore packet loops (and multicast echo) */
1233         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1234                 return false;
1235
1236         /* Get address from the outer IP header */
1237         if (vxlan_get_sk_family(vs) == AF_INET) {
1238                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1239                 saddr.sa.sa_family = AF_INET;
1240 #if IS_ENABLED(CONFIG_IPV6)
1241         } else {
1242                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1243                 saddr.sa.sa_family = AF_INET6;
1244 #endif
1245         }
1246
1247         if ((vxlan->flags & VXLAN_F_LEARN) &&
1248             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1249                 return false;
1250
1251         return true;
1252 }
1253
1254 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1255                                   struct sk_buff *skb)
1256 {
1257         int err = 0;
1258
1259         if (vxlan_get_sk_family(vs) == AF_INET)
1260                 err = IP_ECN_decapsulate(oiph, skb);
1261 #if IS_ENABLED(CONFIG_IPV6)
1262         else
1263                 err = IP6_ECN_decapsulate(oiph, skb);
1264 #endif
1265
1266         if (unlikely(err) && log_ecn_error) {
1267                 if (vxlan_get_sk_family(vs) == AF_INET)
1268                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1269                                              &((struct iphdr *)oiph)->saddr,
1270                                              ((struct iphdr *)oiph)->tos);
1271                 else
1272                         net_info_ratelimited("non-ECT from %pI6\n",
1273                                              &((struct ipv6hdr *)oiph)->saddr);
1274         }
1275         return err <= 1;
1276 }
1277
1278 /* Callback from net/ipv4/udp.c to receive packets */
1279 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1280 {
1281         struct pcpu_sw_netstats *stats;
1282         struct vxlan_dev *vxlan;
1283         struct vxlan_sock *vs;
1284         struct vxlanhdr unparsed;
1285         struct vxlan_metadata _md;
1286         struct vxlan_metadata *md = &_md;
1287         __be32 protocol = htons(ETH_P_TEB);
1288         bool raw_proto = false;
1289         void *oiph;
1290
1291         /* Need UDP and VXLAN header to be present */
1292         if (!pskb_may_pull(skb, VXLAN_HLEN))
1293                 return 1;
1294
1295         unparsed = *vxlan_hdr(skb);
1296         /* VNI flag always required to be set */
1297         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1298                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1299                            ntohl(vxlan_hdr(skb)->vx_flags),
1300                            ntohl(vxlan_hdr(skb)->vx_vni));
1301                 /* Return non vxlan pkt */
1302                 return 1;
1303         }
1304         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1305         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1306
1307         vs = rcu_dereference_sk_user_data(sk);
1308         if (!vs)
1309                 goto drop;
1310
1311         vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1312         if (!vxlan)
1313                 goto drop;
1314
1315         /* For backwards compatibility, only allow reserved fields to be
1316          * used by VXLAN extensions if explicitly requested.
1317          */
1318         if (vs->flags & VXLAN_F_GPE) {
1319                 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1320                         goto drop;
1321                 raw_proto = true;
1322         }
1323
1324         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1325                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1326                         goto drop;
1327
1328         if (vxlan_collect_metadata(vs)) {
1329                 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1330                 struct metadata_dst *tun_dst;
1331
1332                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1333                                          vxlan_vni_to_tun_id(vni), sizeof(*md));
1334
1335                 if (!tun_dst)
1336                         goto drop;
1337
1338                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1339
1340                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1341         } else {
1342                 memset(md, 0, sizeof(*md));
1343         }
1344
1345         if (vs->flags & VXLAN_F_REMCSUM_RX)
1346                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1347                         goto drop;
1348         if (vs->flags & VXLAN_F_GBP)
1349                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1350         /* Note that GBP and GPE can never be active together. This is
1351          * ensured in vxlan_dev_configure.
1352          */
1353
1354         if (unparsed.vx_flags || unparsed.vx_vni) {
1355                 /* If there are any unprocessed flags remaining treat
1356                  * this as a malformed packet. This behavior diverges from
1357                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1358                  * in reserved fields are to be ignored. The approach here
1359                  * maintains compatibility with previous stack code, and also
1360                  * is more robust and provides a little more security in
1361                  * adding extensions to VXLAN.
1362                  */
1363                 goto drop;
1364         }
1365
1366         if (!raw_proto) {
1367                 if (!vxlan_set_mac(vxlan, vs, skb))
1368                         goto drop;
1369         } else {
1370                 skb->dev = vxlan->dev;
1371                 skb->pkt_type = PACKET_HOST;
1372         }
1373
1374         oiph = skb_network_header(skb);
1375         skb_reset_network_header(skb);
1376
1377         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1378                 ++vxlan->dev->stats.rx_frame_errors;
1379                 ++vxlan->dev->stats.rx_errors;
1380                 goto drop;
1381         }
1382
1383         stats = this_cpu_ptr(vxlan->dev->tstats);
1384         u64_stats_update_begin(&stats->syncp);
1385         stats->rx_packets++;
1386         stats->rx_bytes += skb->len;
1387         u64_stats_update_end(&stats->syncp);
1388
1389         gro_cells_receive(&vxlan->gro_cells, skb);
1390         return 0;
1391
1392 drop:
1393         /* Consume bad packet */
1394         kfree_skb(skb);
1395         return 0;
1396 }
1397
1398 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1399 {
1400         struct vxlan_dev *vxlan = netdev_priv(dev);
1401         struct arphdr *parp;
1402         u8 *arpptr, *sha;
1403         __be32 sip, tip;
1404         struct neighbour *n;
1405
1406         if (dev->flags & IFF_NOARP)
1407                 goto out;
1408
1409         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1410                 dev->stats.tx_dropped++;
1411                 goto out;
1412         }
1413         parp = arp_hdr(skb);
1414
1415         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1416              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1417             parp->ar_pro != htons(ETH_P_IP) ||
1418             parp->ar_op != htons(ARPOP_REQUEST) ||
1419             parp->ar_hln != dev->addr_len ||
1420             parp->ar_pln != 4)
1421                 goto out;
1422         arpptr = (u8 *)parp + sizeof(struct arphdr);
1423         sha = arpptr;
1424         arpptr += dev->addr_len;        /* sha */
1425         memcpy(&sip, arpptr, sizeof(sip));
1426         arpptr += sizeof(sip);
1427         arpptr += dev->addr_len;        /* tha */
1428         memcpy(&tip, arpptr, sizeof(tip));
1429
1430         if (ipv4_is_loopback(tip) ||
1431             ipv4_is_multicast(tip))
1432                 goto out;
1433
1434         n = neigh_lookup(&arp_tbl, &tip, dev);
1435
1436         if (n) {
1437                 struct vxlan_fdb *f;
1438                 struct sk_buff  *reply;
1439
1440                 if (!(n->nud_state & NUD_CONNECTED)) {
1441                         neigh_release(n);
1442                         goto out;
1443                 }
1444
1445                 f = vxlan_find_mac(vxlan, n->ha);
1446                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1447                         /* bridge-local neighbor */
1448                         neigh_release(n);
1449                         goto out;
1450                 }
1451
1452                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1453                                 n->ha, sha);
1454
1455                 neigh_release(n);
1456
1457                 if (reply == NULL)
1458                         goto out;
1459
1460                 skb_reset_mac_header(reply);
1461                 __skb_pull(reply, skb_network_offset(reply));
1462                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1463                 reply->pkt_type = PACKET_HOST;
1464
1465                 if (netif_rx_ni(reply) == NET_RX_DROP)
1466                         dev->stats.rx_dropped++;
1467         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1468                 union vxlan_addr ipa = {
1469                         .sin.sin_addr.s_addr = tip,
1470                         .sin.sin_family = AF_INET,
1471                 };
1472
1473                 vxlan_ip_miss(dev, &ipa);
1474         }
1475 out:
1476         consume_skb(skb);
1477         return NETDEV_TX_OK;
1478 }
1479
1480 #if IS_ENABLED(CONFIG_IPV6)
1481 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1482         struct neighbour *n, bool isrouter)
1483 {
1484         struct net_device *dev = request->dev;
1485         struct sk_buff *reply;
1486         struct nd_msg *ns, *na;
1487         struct ipv6hdr *pip6;
1488         u8 *daddr;
1489         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1490         int ns_olen;
1491         int i, len;
1492
1493         if (dev == NULL)
1494                 return NULL;
1495
1496         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1497                 sizeof(*na) + na_olen + dev->needed_tailroom;
1498         reply = alloc_skb(len, GFP_ATOMIC);
1499         if (reply == NULL)
1500                 return NULL;
1501
1502         reply->protocol = htons(ETH_P_IPV6);
1503         reply->dev = dev;
1504         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1505         skb_push(reply, sizeof(struct ethhdr));
1506         skb_reset_mac_header(reply);
1507
1508         ns = (struct nd_msg *)skb_transport_header(request);
1509
1510         daddr = eth_hdr(request)->h_source;
1511         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1512         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1513                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1514                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1515                         break;
1516                 }
1517         }
1518
1519         /* Ethernet header */
1520         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1521         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1522         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1523         reply->protocol = htons(ETH_P_IPV6);
1524
1525         skb_pull(reply, sizeof(struct ethhdr));
1526         skb_reset_network_header(reply);
1527         skb_put(reply, sizeof(struct ipv6hdr));
1528
1529         /* IPv6 header */
1530
1531         pip6 = ipv6_hdr(reply);
1532         memset(pip6, 0, sizeof(struct ipv6hdr));
1533         pip6->version = 6;
1534         pip6->priority = ipv6_hdr(request)->priority;
1535         pip6->nexthdr = IPPROTO_ICMPV6;
1536         pip6->hop_limit = 255;
1537         pip6->daddr = ipv6_hdr(request)->saddr;
1538         pip6->saddr = *(struct in6_addr *)n->primary_key;
1539
1540         skb_pull(reply, sizeof(struct ipv6hdr));
1541         skb_reset_transport_header(reply);
1542
1543         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1544
1545         /* Neighbor Advertisement */
1546         memset(na, 0, sizeof(*na)+na_olen);
1547         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1548         na->icmph.icmp6_router = isrouter;
1549         na->icmph.icmp6_override = 1;
1550         na->icmph.icmp6_solicited = 1;
1551         na->target = ns->target;
1552         ether_addr_copy(&na->opt[2], n->ha);
1553         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1554         na->opt[1] = na_olen >> 3;
1555
1556         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1557                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1558                 csum_partial(na, sizeof(*na)+na_olen, 0));
1559
1560         pip6->payload_len = htons(sizeof(*na)+na_olen);
1561
1562         skb_push(reply, sizeof(struct ipv6hdr));
1563
1564         reply->ip_summed = CHECKSUM_UNNECESSARY;
1565
1566         return reply;
1567 }
1568
1569 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1570 {
1571         struct vxlan_dev *vxlan = netdev_priv(dev);
1572         struct nd_msg *msg;
1573         const struct ipv6hdr *iphdr;
1574         const struct in6_addr *saddr, *daddr;
1575         struct neighbour *n;
1576         struct inet6_dev *in6_dev;
1577
1578         in6_dev = __in6_dev_get(dev);
1579         if (!in6_dev)
1580                 goto out;
1581
1582         iphdr = ipv6_hdr(skb);
1583         saddr = &iphdr->saddr;
1584         daddr = &iphdr->daddr;
1585
1586         msg = (struct nd_msg *)skb_transport_header(skb);
1587         if (msg->icmph.icmp6_code != 0 ||
1588             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1589                 goto out;
1590
1591         if (ipv6_addr_loopback(daddr) ||
1592             ipv6_addr_is_multicast(&msg->target))
1593                 goto out;
1594
1595         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1596
1597         if (n) {
1598                 struct vxlan_fdb *f;
1599                 struct sk_buff *reply;
1600
1601                 if (!(n->nud_state & NUD_CONNECTED)) {
1602                         neigh_release(n);
1603                         goto out;
1604                 }
1605
1606                 f = vxlan_find_mac(vxlan, n->ha);
1607                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1608                         /* bridge-local neighbor */
1609                         neigh_release(n);
1610                         goto out;
1611                 }
1612
1613                 reply = vxlan_na_create(skb, n,
1614                                         !!(f ? f->flags & NTF_ROUTER : 0));
1615
1616                 neigh_release(n);
1617
1618                 if (reply == NULL)
1619                         goto out;
1620
1621                 if (netif_rx_ni(reply) == NET_RX_DROP)
1622                         dev->stats.rx_dropped++;
1623
1624         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1625                 union vxlan_addr ipa = {
1626                         .sin6.sin6_addr = msg->target,
1627                         .sin6.sin6_family = AF_INET6,
1628                 };
1629
1630                 vxlan_ip_miss(dev, &ipa);
1631         }
1632
1633 out:
1634         consume_skb(skb);
1635         return NETDEV_TX_OK;
1636 }
1637 #endif
1638
1639 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1640 {
1641         struct vxlan_dev *vxlan = netdev_priv(dev);
1642         struct neighbour *n;
1643
1644         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1645                 return false;
1646
1647         n = NULL;
1648         switch (ntohs(eth_hdr(skb)->h_proto)) {
1649         case ETH_P_IP:
1650         {
1651                 struct iphdr *pip;
1652
1653                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1654                         return false;
1655                 pip = ip_hdr(skb);
1656                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1657                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1658                         union vxlan_addr ipa = {
1659                                 .sin.sin_addr.s_addr = pip->daddr,
1660                                 .sin.sin_family = AF_INET,
1661                         };
1662
1663                         vxlan_ip_miss(dev, &ipa);
1664                         return false;
1665                 }
1666
1667                 break;
1668         }
1669 #if IS_ENABLED(CONFIG_IPV6)
1670         case ETH_P_IPV6:
1671         {
1672                 struct ipv6hdr *pip6;
1673
1674                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1675                         return false;
1676                 pip6 = ipv6_hdr(skb);
1677                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1678                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1679                         union vxlan_addr ipa = {
1680                                 .sin6.sin6_addr = pip6->daddr,
1681                                 .sin6.sin6_family = AF_INET6,
1682                         };
1683
1684                         vxlan_ip_miss(dev, &ipa);
1685                         return false;
1686                 }
1687
1688                 break;
1689         }
1690 #endif
1691         default:
1692                 return false;
1693         }
1694
1695         if (n) {
1696                 bool diff;
1697
1698                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1699                 if (diff) {
1700                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1701                                 dev->addr_len);
1702                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1703                 }
1704                 neigh_release(n);
1705                 return diff;
1706         }
1707
1708         return false;
1709 }
1710
1711 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1712                                 struct vxlan_metadata *md)
1713 {
1714         struct vxlanhdr_gbp *gbp;
1715
1716         if (!md->gbp)
1717                 return;
1718
1719         gbp = (struct vxlanhdr_gbp *)vxh;
1720         vxh->vx_flags |= VXLAN_HF_GBP;
1721
1722         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1723                 gbp->dont_learn = 1;
1724
1725         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1726                 gbp->policy_applied = 1;
1727
1728         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1729 }
1730
1731 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1732                                __be16 protocol)
1733 {
1734         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1735
1736         gpe->np_applied = 1;
1737
1738         switch (protocol) {
1739         case htons(ETH_P_IP):
1740                 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1741                 return 0;
1742         case htons(ETH_P_IPV6):
1743                 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1744                 return 0;
1745         case htons(ETH_P_TEB):
1746                 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1747                 return 0;
1748         }
1749         return -EPFNOSUPPORT;
1750 }
1751
1752 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1753                            int iphdr_len, __be32 vni,
1754                            struct vxlan_metadata *md, u32 vxflags,
1755                            bool udp_sum)
1756 {
1757         struct vxlanhdr *vxh;
1758         int min_headroom;
1759         int err;
1760         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1761         __be16 inner_protocol = htons(ETH_P_TEB);
1762
1763         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1764             skb->ip_summed == CHECKSUM_PARTIAL) {
1765                 int csum_start = skb_checksum_start_offset(skb);
1766
1767                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1768                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1769                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1770                      skb->csum_offset == offsetof(struct tcphdr, check)))
1771                         type |= SKB_GSO_TUNNEL_REMCSUM;
1772         }
1773
1774         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1775                         + VXLAN_HLEN + iphdr_len
1776                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1777
1778         /* Need space for new headers (invalidates iph ptr) */
1779         err = skb_cow_head(skb, min_headroom);
1780         if (unlikely(err))
1781                 goto out_free;
1782
1783         skb = vlan_hwaccel_push_inside(skb);
1784         if (WARN_ON(!skb))
1785                 return -ENOMEM;
1786
1787         skb = iptunnel_handle_offloads(skb, type);
1788         if (IS_ERR(skb))
1789                 return PTR_ERR(skb);
1790
1791         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1792         vxh->vx_flags = VXLAN_HF_VNI;
1793         vxh->vx_vni = vxlan_vni_field(vni);
1794
1795         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1796                 unsigned int start;
1797
1798                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1799                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1800                 vxh->vx_flags |= VXLAN_HF_RCO;
1801
1802                 if (!skb_is_gso(skb)) {
1803                         skb->ip_summed = CHECKSUM_NONE;
1804                         skb->encapsulation = 0;
1805                 }
1806         }
1807
1808         if (vxflags & VXLAN_F_GBP)
1809                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1810         if (vxflags & VXLAN_F_GPE) {
1811                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1812                 if (err < 0)
1813                         goto out_free;
1814                 inner_protocol = skb->protocol;
1815         }
1816
1817         skb_set_inner_protocol(skb, inner_protocol);
1818         return 0;
1819
1820 out_free:
1821         kfree_skb(skb);
1822         return err;
1823 }
1824
1825 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1826                                       struct sk_buff *skb, int oif, u8 tos,
1827                                       __be32 daddr, __be32 *saddr,
1828                                       struct dst_cache *dst_cache,
1829                                       const struct ip_tunnel_info *info)
1830 {
1831         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1832         struct rtable *rt = NULL;
1833         struct flowi4 fl4;
1834
1835         if (tos && !info)
1836                 use_cache = false;
1837         if (use_cache) {
1838                 rt = dst_cache_get_ip4(dst_cache, saddr);
1839                 if (rt)
1840                         return rt;
1841         }
1842
1843         memset(&fl4, 0, sizeof(fl4));
1844         fl4.flowi4_oif = oif;
1845         fl4.flowi4_tos = RT_TOS(tos);
1846         fl4.flowi4_mark = skb->mark;
1847         fl4.flowi4_proto = IPPROTO_UDP;
1848         fl4.daddr = daddr;
1849         fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1850
1851         rt = ip_route_output_key(vxlan->net, &fl4);
1852         if (!IS_ERR(rt)) {
1853                 *saddr = fl4.saddr;
1854                 if (use_cache)
1855                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1856         }
1857         return rt;
1858 }
1859
1860 #if IS_ENABLED(CONFIG_IPV6)
1861 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1862                                           struct sk_buff *skb, int oif, u8 tos,
1863                                           __be32 label,
1864                                           const struct in6_addr *daddr,
1865                                           struct in6_addr *saddr,
1866                                           struct dst_cache *dst_cache,
1867                                           const struct ip_tunnel_info *info)
1868 {
1869         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1870         struct dst_entry *ndst;
1871         struct flowi6 fl6;
1872         int err;
1873
1874         if (tos && !info)
1875                 use_cache = false;
1876         if (use_cache) {
1877                 ndst = dst_cache_get_ip6(dst_cache, saddr);
1878                 if (ndst)
1879                         return ndst;
1880         }
1881
1882         memset(&fl6, 0, sizeof(fl6));
1883         fl6.flowi6_oif = oif;
1884         fl6.daddr = *daddr;
1885         fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1886         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1887         fl6.flowi6_mark = skb->mark;
1888         fl6.flowi6_proto = IPPROTO_UDP;
1889
1890         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1891                                          vxlan->vn6_sock->sock->sk,
1892                                          &ndst, &fl6);
1893         if (err < 0)
1894                 return ERR_PTR(err);
1895
1896         *saddr = fl6.saddr;
1897         if (use_cache)
1898                 dst_cache_set_ip6(dst_cache, ndst, saddr);
1899         return ndst;
1900 }
1901 #endif
1902
1903 /* Bypass encapsulation if the destination is local */
1904 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1905                                struct vxlan_dev *dst_vxlan)
1906 {
1907         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1908         union vxlan_addr loopback;
1909         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1910         struct net_device *dev = skb->dev;
1911         int len = skb->len;
1912
1913         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1914         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1915         skb->pkt_type = PACKET_HOST;
1916         skb->encapsulation = 0;
1917         skb->dev = dst_vxlan->dev;
1918         __skb_pull(skb, skb_network_offset(skb));
1919
1920         if (remote_ip->sa.sa_family == AF_INET) {
1921                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1922                 loopback.sa.sa_family =  AF_INET;
1923 #if IS_ENABLED(CONFIG_IPV6)
1924         } else {
1925                 loopback.sin6.sin6_addr = in6addr_loopback;
1926                 loopback.sa.sa_family =  AF_INET6;
1927 #endif
1928         }
1929
1930         if (dst_vxlan->flags & VXLAN_F_LEARN)
1931                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1932
1933         u64_stats_update_begin(&tx_stats->syncp);
1934         tx_stats->tx_packets++;
1935         tx_stats->tx_bytes += len;
1936         u64_stats_update_end(&tx_stats->syncp);
1937
1938         if (netif_rx(skb) == NET_RX_SUCCESS) {
1939                 u64_stats_update_begin(&rx_stats->syncp);
1940                 rx_stats->rx_packets++;
1941                 rx_stats->rx_bytes += len;
1942                 u64_stats_update_end(&rx_stats->syncp);
1943         } else {
1944                 dev->stats.rx_dropped++;
1945         }
1946 }
1947
1948 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1949                            struct vxlan_rdst *rdst, bool did_rsc)
1950 {
1951         struct dst_cache *dst_cache;
1952         struct ip_tunnel_info *info;
1953         struct vxlan_dev *vxlan = netdev_priv(dev);
1954         struct sock *sk;
1955         struct rtable *rt = NULL;
1956         const struct iphdr *old_iph;
1957         union vxlan_addr *dst;
1958         union vxlan_addr remote_ip;
1959         struct vxlan_metadata _md;
1960         struct vxlan_metadata *md = &_md;
1961         __be16 src_port = 0, dst_port;
1962         __be32 vni, label;
1963         __be16 df = 0;
1964         __u8 tos, ttl;
1965         int err;
1966         u32 flags = vxlan->flags;
1967         bool udp_sum = false;
1968         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1969
1970         info = skb_tunnel_info(skb);
1971
1972         if (rdst) {
1973                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1974                 vni = rdst->remote_vni;
1975                 dst = &rdst->remote_ip;
1976                 dst_cache = &rdst->dst_cache;
1977         } else {
1978                 if (!info) {
1979                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1980                                   dev->name);
1981                         goto drop;
1982                 }
1983                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1984                 vni = vxlan_tun_id_to_vni(info->key.tun_id);
1985                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1986                 if (remote_ip.sa.sa_family == AF_INET)
1987                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1988                 else
1989                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1990                 dst = &remote_ip;
1991                 dst_cache = &info->dst_cache;
1992         }
1993
1994         if (vxlan_addr_any(dst)) {
1995                 if (did_rsc) {
1996                         /* short-circuited back to local bridge */
1997                         vxlan_encap_bypass(skb, vxlan, vxlan);
1998                         return;
1999                 }
2000                 goto drop;
2001         }
2002
2003         old_iph = ip_hdr(skb);
2004
2005         ttl = vxlan->cfg.ttl;
2006         if (!ttl && vxlan_addr_multicast(dst))
2007                 ttl = 1;
2008
2009         tos = vxlan->cfg.tos;
2010         if (tos == 1)
2011                 tos = ip_tunnel_get_dsfield(old_iph, skb);
2012
2013         label = vxlan->cfg.label;
2014         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2015                                      vxlan->cfg.port_max, true);
2016
2017         if (info) {
2018                 ttl = info->key.ttl;
2019                 tos = info->key.tos;
2020                 label = info->key.label;
2021                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2022
2023                 if (info->options_len)
2024                         md = ip_tunnel_info_opts(info);
2025         } else {
2026                 md->gbp = skb->mark;
2027         }
2028
2029         if (dst->sa.sa_family == AF_INET) {
2030                 __be32 saddr;
2031
2032                 if (!vxlan->vn4_sock)
2033                         goto drop;
2034                 sk = vxlan->vn4_sock->sock->sk;
2035
2036                 rt = vxlan_get_route(vxlan, skb,
2037                                      rdst ? rdst->remote_ifindex : 0, tos,
2038                                      dst->sin.sin_addr.s_addr, &saddr,
2039                                      dst_cache, info);
2040                 if (IS_ERR(rt)) {
2041                         netdev_dbg(dev, "no route to %pI4\n",
2042                                    &dst->sin.sin_addr.s_addr);
2043                         dev->stats.tx_carrier_errors++;
2044                         goto tx_error;
2045                 }
2046
2047                 if (rt->dst.dev == dev) {
2048                         netdev_dbg(dev, "circular route to %pI4\n",
2049                                    &dst->sin.sin_addr.s_addr);
2050                         dev->stats.collisions++;
2051                         goto rt_tx_error;
2052                 }
2053
2054                 /* Bypass encapsulation if the destination is local */
2055                 if (rt->rt_flags & RTCF_LOCAL &&
2056                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2057                         struct vxlan_dev *dst_vxlan;
2058
2059                         ip_rt_put(rt);
2060                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2061                                                    dst->sa.sa_family, dst_port,
2062                                                    vxlan->flags);
2063                         if (!dst_vxlan)
2064                                 goto tx_error;
2065                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2066                         return;
2067                 }
2068
2069                 if (!info)
2070                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2071                 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2072                         df = htons(IP_DF);
2073
2074                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2075                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2076                 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2077                                       vni, md, flags, udp_sum);
2078                 if (err < 0)
2079                         goto xmit_tx_error;
2080
2081                 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2082                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2083                                     src_port, dst_port, xnet, !udp_sum);
2084 #if IS_ENABLED(CONFIG_IPV6)
2085         } else {
2086                 struct dst_entry *ndst;
2087                 struct in6_addr saddr;
2088                 u32 rt6i_flags;
2089
2090                 if (!vxlan->vn6_sock)
2091                         goto drop;
2092                 sk = vxlan->vn6_sock->sock->sk;
2093
2094                 ndst = vxlan6_get_route(vxlan, skb,
2095                                         rdst ? rdst->remote_ifindex : 0, tos,
2096                                         label, &dst->sin6.sin6_addr, &saddr,
2097                                         dst_cache, info);
2098                 if (IS_ERR(ndst)) {
2099                         netdev_dbg(dev, "no route to %pI6\n",
2100                                    &dst->sin6.sin6_addr);
2101                         dev->stats.tx_carrier_errors++;
2102                         goto tx_error;
2103                 }
2104
2105                 if (ndst->dev == dev) {
2106                         netdev_dbg(dev, "circular route to %pI6\n",
2107                                    &dst->sin6.sin6_addr);
2108                         dst_release(ndst);
2109                         dev->stats.collisions++;
2110                         goto tx_error;
2111                 }
2112
2113                 /* Bypass encapsulation if the destination is local */
2114                 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2115                 if (rt6i_flags & RTF_LOCAL &&
2116                     !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2117                         struct vxlan_dev *dst_vxlan;
2118
2119                         dst_release(ndst);
2120                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2121                                                    dst->sa.sa_family, dst_port,
2122                                                    vxlan->flags);
2123                         if (!dst_vxlan)
2124                                 goto tx_error;
2125                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2126                         return;
2127                 }
2128
2129                 if (!info)
2130                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2131
2132                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2133                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2134                 skb_scrub_packet(skb, xnet);
2135                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2136                                       vni, md, flags, udp_sum);
2137                 if (err < 0) {
2138                         dst_release(ndst);
2139                         return;
2140                 }
2141                 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2142                                      &saddr, &dst->sin6.sin6_addr, tos, ttl,
2143                                      label, src_port, dst_port, !udp_sum);
2144 #endif
2145         }
2146
2147         return;
2148
2149 drop:
2150         dev->stats.tx_dropped++;
2151         goto tx_free;
2152
2153 xmit_tx_error:
2154         /* skb is already freed. */
2155         skb = NULL;
2156 rt_tx_error:
2157         ip_rt_put(rt);
2158 tx_error:
2159         dev->stats.tx_errors++;
2160 tx_free:
2161         dev_kfree_skb(skb);
2162 }
2163
2164 /* Transmit local packets over Vxlan
2165  *
2166  * Outer IP header inherits ECN and DF from inner header.
2167  * Outer UDP destination is the VXLAN assigned port.
2168  *           source port is based on hash of flow
2169  */
2170 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2171 {
2172         struct vxlan_dev *vxlan = netdev_priv(dev);
2173         const struct ip_tunnel_info *info;
2174         struct ethhdr *eth;
2175         bool did_rsc = false;
2176         struct vxlan_rdst *rdst, *fdst = NULL;
2177         struct vxlan_fdb *f;
2178
2179         info = skb_tunnel_info(skb);
2180
2181         skb_reset_mac_header(skb);
2182
2183         if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2184                 if (info && info->mode & IP_TUNNEL_INFO_TX)
2185                         vxlan_xmit_one(skb, dev, NULL, false);
2186                 else
2187                         kfree_skb(skb);
2188                 return NETDEV_TX_OK;
2189         }
2190
2191         if (vxlan->flags & VXLAN_F_PROXY) {
2192                 eth = eth_hdr(skb);
2193                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2194                         return arp_reduce(dev, skb);
2195 #if IS_ENABLED(CONFIG_IPV6)
2196                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2197                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2198                                        + sizeof(struct nd_msg)) &&
2199                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2200                                 struct nd_msg *msg;
2201
2202                                 msg = (struct nd_msg *)skb_transport_header(skb);
2203                                 if (msg->icmph.icmp6_code == 0 &&
2204                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2205                                         return neigh_reduce(dev, skb);
2206                 }
2207 #endif
2208         }
2209
2210         eth = eth_hdr(skb);
2211         f = vxlan_find_mac(vxlan, eth->h_dest);
2212         did_rsc = false;
2213
2214         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2215             (ntohs(eth->h_proto) == ETH_P_IP ||
2216              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2217                 did_rsc = route_shortcircuit(dev, skb);
2218                 if (did_rsc)
2219                         f = vxlan_find_mac(vxlan, eth->h_dest);
2220         }
2221
2222         if (f == NULL) {
2223                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2224                 if (f == NULL) {
2225                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2226                             !is_multicast_ether_addr(eth->h_dest))
2227                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2228
2229                         dev->stats.tx_dropped++;
2230                         kfree_skb(skb);
2231                         return NETDEV_TX_OK;
2232                 }
2233         }
2234
2235         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2236                 struct sk_buff *skb1;
2237
2238                 if (!fdst) {
2239                         fdst = rdst;
2240                         continue;
2241                 }
2242                 skb1 = skb_clone(skb, GFP_ATOMIC);
2243                 if (skb1)
2244                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2245         }
2246
2247         if (fdst)
2248                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2249         else
2250                 kfree_skb(skb);
2251         return NETDEV_TX_OK;
2252 }
2253
2254 /* Walk the forwarding table and purge stale entries */
2255 static void vxlan_cleanup(unsigned long arg)
2256 {
2257         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2258         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2259         unsigned int h;
2260
2261         if (!netif_running(vxlan->dev))
2262                 return;
2263
2264         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2265                 struct hlist_node *p, *n;
2266
2267                 spin_lock_bh(&vxlan->hash_lock);
2268                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2269                         struct vxlan_fdb *f
2270                                 = container_of(p, struct vxlan_fdb, hlist);
2271                         unsigned long timeout;
2272
2273                         if (f->state & NUD_PERMANENT)
2274                                 continue;
2275
2276                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2277                         if (time_before_eq(timeout, jiffies)) {
2278                                 netdev_dbg(vxlan->dev,
2279                                            "garbage collect %pM\n",
2280                                            f->eth_addr);
2281                                 f->state = NUD_STALE;
2282                                 vxlan_fdb_destroy(vxlan, f);
2283                         } else if (time_before(timeout, next_timer))
2284                                 next_timer = timeout;
2285                 }
2286                 spin_unlock_bh(&vxlan->hash_lock);
2287         }
2288
2289         mod_timer(&vxlan->age_timer, next_timer);
2290 }
2291
2292 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2293 {
2294         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2295         __be32 vni = vxlan->default_dst.remote_vni;
2296
2297         spin_lock(&vn->sock_lock);
2298         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2299         spin_unlock(&vn->sock_lock);
2300 }
2301
2302 /* Setup stats when device is created */
2303 static int vxlan_init(struct net_device *dev)
2304 {
2305         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2306         if (!dev->tstats)
2307                 return -ENOMEM;
2308
2309         return 0;
2310 }
2311
2312 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2313 {
2314         struct vxlan_fdb *f;
2315
2316         spin_lock_bh(&vxlan->hash_lock);
2317         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2318         if (f)
2319                 vxlan_fdb_destroy(vxlan, f);
2320         spin_unlock_bh(&vxlan->hash_lock);
2321 }
2322
2323 static void vxlan_uninit(struct net_device *dev)
2324 {
2325         struct vxlan_dev *vxlan = netdev_priv(dev);
2326
2327         vxlan_fdb_delete_default(vxlan);
2328
2329         free_percpu(dev->tstats);
2330 }
2331
2332 /* Start ageing timer and join group when device is brought up */
2333 static int vxlan_open(struct net_device *dev)
2334 {
2335         struct vxlan_dev *vxlan = netdev_priv(dev);
2336         int ret;
2337
2338         ret = vxlan_sock_add(vxlan);
2339         if (ret < 0)
2340                 return ret;
2341
2342         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2343                 ret = vxlan_igmp_join(vxlan);
2344                 if (ret == -EADDRINUSE)
2345                         ret = 0;
2346                 if (ret) {
2347                         vxlan_sock_release(vxlan);
2348                         return ret;
2349                 }
2350         }
2351
2352         if (vxlan->cfg.age_interval)
2353                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2354
2355         return ret;
2356 }
2357
2358 /* Purge the forwarding table */
2359 static void vxlan_flush(struct vxlan_dev *vxlan)
2360 {
2361         unsigned int h;
2362
2363         spin_lock_bh(&vxlan->hash_lock);
2364         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2365                 struct hlist_node *p, *n;
2366                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2367                         struct vxlan_fdb *f
2368                                 = container_of(p, struct vxlan_fdb, hlist);
2369                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2370                         if (!is_zero_ether_addr(f->eth_addr))
2371                                 vxlan_fdb_destroy(vxlan, f);
2372                 }
2373         }
2374         spin_unlock_bh(&vxlan->hash_lock);
2375 }
2376
2377 /* Cleanup timer and forwarding table on shutdown */
2378 static int vxlan_stop(struct net_device *dev)
2379 {
2380         struct vxlan_dev *vxlan = netdev_priv(dev);
2381         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2382         int ret = 0;
2383
2384         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2385             !vxlan_group_used(vn, vxlan))
2386                 ret = vxlan_igmp_leave(vxlan);
2387
2388         del_timer_sync(&vxlan->age_timer);
2389
2390         vxlan_flush(vxlan);
2391         vxlan_sock_release(vxlan);
2392
2393         return ret;
2394 }
2395
2396 /* Stub, nothing needs to be done. */
2397 static void vxlan_set_multicast_list(struct net_device *dev)
2398 {
2399 }
2400
2401 static int __vxlan_change_mtu(struct net_device *dev,
2402                               struct net_device *lowerdev,
2403                               struct vxlan_rdst *dst, int new_mtu, bool strict)
2404 {
2405         int max_mtu = IP_MAX_MTU;
2406
2407         if (lowerdev)
2408                 max_mtu = lowerdev->mtu;
2409
2410         if (dst->remote_ip.sa.sa_family == AF_INET6)
2411                 max_mtu -= VXLAN6_HEADROOM;
2412         else
2413                 max_mtu -= VXLAN_HEADROOM;
2414
2415         if (new_mtu < 68)
2416                 return -EINVAL;
2417
2418         if (new_mtu > max_mtu) {
2419                 if (strict)
2420                         return -EINVAL;
2421
2422                 new_mtu = max_mtu;
2423         }
2424
2425         dev->mtu = new_mtu;
2426         return 0;
2427 }
2428
2429 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2430 {
2431         struct vxlan_dev *vxlan = netdev_priv(dev);
2432         struct vxlan_rdst *dst = &vxlan->default_dst;
2433         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2434                                                          dst->remote_ifindex);
2435         return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2436 }
2437
2438 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2439 {
2440         struct vxlan_dev *vxlan = netdev_priv(dev);
2441         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2442         __be16 sport, dport;
2443
2444         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2445                                   vxlan->cfg.port_max, true);
2446         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2447
2448         if (ip_tunnel_info_af(info) == AF_INET) {
2449                 struct rtable *rt;
2450
2451                 if (!vxlan->vn4_sock)
2452                         return -EINVAL;
2453                 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2454                                      info->key.u.ipv4.dst,
2455                                      &info->key.u.ipv4.src, NULL, info);
2456                 if (IS_ERR(rt))
2457                         return PTR_ERR(rt);
2458                 ip_rt_put(rt);
2459         } else {
2460 #if IS_ENABLED(CONFIG_IPV6)
2461                 struct dst_entry *ndst;
2462
2463                 if (!vxlan->vn6_sock)
2464                         return -EINVAL;
2465                 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
2466                                         info->key.label, &info->key.u.ipv6.dst,
2467                                         &info->key.u.ipv6.src, NULL, info);
2468                 if (IS_ERR(ndst))
2469                         return PTR_ERR(ndst);
2470                 dst_release(ndst);
2471 #else /* !CONFIG_IPV6 */
2472                 return -EPFNOSUPPORT;
2473 #endif
2474         }
2475         info->key.tp_src = sport;
2476         info->key.tp_dst = dport;
2477         return 0;
2478 }
2479
2480 static const struct net_device_ops vxlan_netdev_ether_ops = {
2481         .ndo_init               = vxlan_init,
2482         .ndo_uninit             = vxlan_uninit,
2483         .ndo_open               = vxlan_open,
2484         .ndo_stop               = vxlan_stop,
2485         .ndo_start_xmit         = vxlan_xmit,
2486         .ndo_get_stats64        = ip_tunnel_get_stats64,
2487         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2488         .ndo_change_mtu         = vxlan_change_mtu,
2489         .ndo_validate_addr      = eth_validate_addr,
2490         .ndo_set_mac_address    = eth_mac_addr,
2491         .ndo_fdb_add            = vxlan_fdb_add,
2492         .ndo_fdb_del            = vxlan_fdb_delete,
2493         .ndo_fdb_dump           = vxlan_fdb_dump,
2494         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2495 };
2496
2497 static const struct net_device_ops vxlan_netdev_raw_ops = {
2498         .ndo_init               = vxlan_init,
2499         .ndo_uninit             = vxlan_uninit,
2500         .ndo_open               = vxlan_open,
2501         .ndo_stop               = vxlan_stop,
2502         .ndo_start_xmit         = vxlan_xmit,
2503         .ndo_get_stats64        = ip_tunnel_get_stats64,
2504         .ndo_change_mtu         = vxlan_change_mtu,
2505         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2506 };
2507
2508 /* Info for udev, that this is a virtual tunnel endpoint */
2509 static struct device_type vxlan_type = {
2510         .name = "vxlan",
2511 };
2512
2513 /* Calls the ndo_add_vxlan_port of the caller in order to
2514  * supply the listening VXLAN udp ports. Callers are expected
2515  * to implement the ndo_add_vxlan_port.
2516  */
2517 void vxlan_get_rx_port(struct net_device *dev)
2518 {
2519         struct vxlan_sock *vs;
2520         struct net *net = dev_net(dev);
2521         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2522         sa_family_t sa_family;
2523         __be16 port;
2524         unsigned int i;
2525
2526         spin_lock(&vn->sock_lock);
2527         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2528                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2529                         port = inet_sk(vs->sock->sk)->inet_sport;
2530                         sa_family = vxlan_get_sk_family(vs);
2531                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2532                                                             port);
2533                 }
2534         }
2535         spin_unlock(&vn->sock_lock);
2536 }
2537 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2538
2539 /* Initialize the device structure. */
2540 static void vxlan_setup(struct net_device *dev)
2541 {
2542         struct vxlan_dev *vxlan = netdev_priv(dev);
2543         unsigned int h;
2544
2545         dev->destructor = free_netdev;
2546         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2547
2548         dev->features   |= NETIF_F_LLTX;
2549         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2550         dev->features   |= NETIF_F_RXCSUM;
2551         dev->features   |= NETIF_F_GSO_SOFTWARE;
2552
2553         dev->vlan_features = dev->features;
2554         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2555         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2556         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2557         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2558         netif_keep_dst(dev);
2559         dev->priv_flags |= IFF_NO_QUEUE;
2560
2561         INIT_LIST_HEAD(&vxlan->next);
2562         spin_lock_init(&vxlan->hash_lock);
2563
2564         init_timer_deferrable(&vxlan->age_timer);
2565         vxlan->age_timer.function = vxlan_cleanup;
2566         vxlan->age_timer.data = (unsigned long) vxlan;
2567
2568         vxlan->cfg.dst_port = htons(vxlan_port);
2569
2570         vxlan->dev = dev;
2571
2572         gro_cells_init(&vxlan->gro_cells, dev);
2573
2574         for (h = 0; h < FDB_HASH_SIZE; ++h)
2575                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2576 }
2577
2578 static void vxlan_ether_setup(struct net_device *dev)
2579 {
2580         eth_hw_addr_random(dev);
2581         ether_setup(dev);
2582         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2583         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2584         dev->netdev_ops = &vxlan_netdev_ether_ops;
2585 }
2586
2587 static void vxlan_raw_setup(struct net_device *dev)
2588 {
2589         dev->type = ARPHRD_NONE;
2590         dev->hard_header_len = 0;
2591         dev->addr_len = 0;
2592         dev->mtu = ETH_DATA_LEN;
2593         dev->tx_queue_len = 1000;
2594         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2595         dev->netdev_ops = &vxlan_netdev_raw_ops;
2596 }
2597
2598 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2599         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2600         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2601         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2602         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2603         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2604         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2605         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2606         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2607         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
2608         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2609         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2610         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2611         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2612         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2613         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2614         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2615         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2616         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2617         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2618         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2619         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2620         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2621         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2622         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2623         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2624         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
2625         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2626 };
2627
2628 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2629 {
2630         if (tb[IFLA_ADDRESS]) {
2631                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2632                         pr_debug("invalid link address (not ethernet)\n");
2633                         return -EINVAL;
2634                 }
2635
2636                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2637                         pr_debug("invalid all zero ethernet address\n");
2638                         return -EADDRNOTAVAIL;
2639                 }
2640         }
2641
2642         if (!data)
2643                 return -EINVAL;
2644
2645         if (data[IFLA_VXLAN_ID]) {
2646                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2647                 if (id >= VXLAN_VID_MASK)
2648                         return -ERANGE;
2649         }
2650
2651         if (data[IFLA_VXLAN_PORT_RANGE]) {
2652                 const struct ifla_vxlan_port_range *p
2653                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2654
2655                 if (ntohs(p->high) < ntohs(p->low)) {
2656                         pr_debug("port range %u .. %u not valid\n",
2657                                  ntohs(p->low), ntohs(p->high));
2658                         return -EINVAL;
2659                 }
2660         }
2661
2662         return 0;
2663 }
2664
2665 static void vxlan_get_drvinfo(struct net_device *netdev,
2666                               struct ethtool_drvinfo *drvinfo)
2667 {
2668         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2669         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2670 }
2671
2672 static const struct ethtool_ops vxlan_ethtool_ops = {
2673         .get_drvinfo    = vxlan_get_drvinfo,
2674         .get_link       = ethtool_op_get_link,
2675 };
2676
2677 static void vxlan_del_work(struct work_struct *work)
2678 {
2679         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2680         udp_tunnel_sock_release(vs->sock);
2681         kfree_rcu(vs, rcu);
2682 }
2683
2684 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2685                                         __be16 port, u32 flags)
2686 {
2687         struct socket *sock;
2688         struct udp_port_cfg udp_conf;
2689         int err;
2690
2691         memset(&udp_conf, 0, sizeof(udp_conf));
2692
2693         if (ipv6) {
2694                 udp_conf.family = AF_INET6;
2695                 udp_conf.use_udp6_rx_checksums =
2696                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2697                 udp_conf.ipv6_v6only = 1;
2698         } else {
2699                 udp_conf.family = AF_INET;
2700         }
2701
2702         udp_conf.local_udp_port = port;
2703
2704         /* Open UDP socket */
2705         err = udp_sock_create(net, &udp_conf, &sock);
2706         if (err < 0)
2707                 return ERR_PTR(err);
2708
2709         return sock;
2710 }
2711
2712 /* Create new listen socket if needed */
2713 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2714                                               __be16 port, u32 flags)
2715 {
2716         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2717         struct vxlan_sock *vs;
2718         struct socket *sock;
2719         unsigned int h;
2720         struct udp_tunnel_sock_cfg tunnel_cfg;
2721
2722         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2723         if (!vs)
2724                 return ERR_PTR(-ENOMEM);
2725
2726         for (h = 0; h < VNI_HASH_SIZE; ++h)
2727                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2728
2729         INIT_WORK(&vs->del_work, vxlan_del_work);
2730
2731         sock = vxlan_create_sock(net, ipv6, port, flags);
2732         if (IS_ERR(sock)) {
2733                 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2734                         PTR_ERR(sock));
2735                 kfree(vs);
2736                 return ERR_CAST(sock);
2737         }
2738
2739         vs->sock = sock;
2740         atomic_set(&vs->refcnt, 1);
2741         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2742
2743         spin_lock(&vn->sock_lock);
2744         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2745         vxlan_notify_add_rx_port(vs);
2746         spin_unlock(&vn->sock_lock);
2747
2748         /* Mark socket as an encapsulation socket. */
2749         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2750         tunnel_cfg.sk_user_data = vs;
2751         tunnel_cfg.encap_type = 1;
2752         tunnel_cfg.encap_rcv = vxlan_rcv;
2753         tunnel_cfg.encap_destroy = NULL;
2754         tunnel_cfg.gro_receive = vxlan_gro_receive;
2755         tunnel_cfg.gro_complete = vxlan_gro_complete;
2756
2757         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2758
2759         return vs;
2760 }
2761
2762 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2763 {
2764         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2765         struct vxlan_sock *vs = NULL;
2766
2767         if (!vxlan->cfg.no_share) {
2768                 spin_lock(&vn->sock_lock);
2769                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2770                                      vxlan->cfg.dst_port, vxlan->flags);
2771                 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2772                         spin_unlock(&vn->sock_lock);
2773                         return -EBUSY;
2774                 }
2775                 spin_unlock(&vn->sock_lock);
2776         }
2777         if (!vs)
2778                 vs = vxlan_socket_create(vxlan->net, ipv6,
2779                                          vxlan->cfg.dst_port, vxlan->flags);
2780         if (IS_ERR(vs))
2781                 return PTR_ERR(vs);
2782 #if IS_ENABLED(CONFIG_IPV6)
2783         if (ipv6)
2784                 vxlan->vn6_sock = vs;
2785         else
2786 #endif
2787                 vxlan->vn4_sock = vs;
2788         vxlan_vs_add_dev(vs, vxlan);
2789         return 0;
2790 }
2791
2792 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2793 {
2794         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2795         bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2796         int ret = 0;
2797
2798         vxlan->vn4_sock = NULL;
2799 #if IS_ENABLED(CONFIG_IPV6)
2800         vxlan->vn6_sock = NULL;
2801         if (ipv6 || metadata)
2802                 ret = __vxlan_sock_add(vxlan, true);
2803 #endif
2804         if (!ret && (!ipv6 || metadata))
2805                 ret = __vxlan_sock_add(vxlan, false);
2806         if (ret < 0)
2807                 vxlan_sock_release(vxlan);
2808         return ret;
2809 }
2810
2811 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2812                                struct vxlan_config *conf)
2813 {
2814         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2815         struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2816         struct vxlan_rdst *dst = &vxlan->default_dst;
2817         unsigned short needed_headroom = ETH_HLEN;
2818         int err;
2819         bool use_ipv6 = false;
2820         __be16 default_port = vxlan->cfg.dst_port;
2821         struct net_device *lowerdev = NULL;
2822
2823         if (conf->flags & VXLAN_F_GPE) {
2824                 if (conf->flags & ~VXLAN_F_ALLOWED_GPE)
2825                         return -EINVAL;
2826                 /* For now, allow GPE only together with COLLECT_METADATA.
2827                  * This can be relaxed later; in such case, the other side
2828                  * of the PtP link will have to be provided.
2829                  */
2830                 if (!(conf->flags & VXLAN_F_COLLECT_METADATA))
2831                         return -EINVAL;
2832
2833                 vxlan_raw_setup(dev);
2834         } else {
2835                 vxlan_ether_setup(dev);
2836         }
2837
2838         vxlan->net = src_net;
2839
2840         dst->remote_vni = conf->vni;
2841
2842         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2843
2844         /* Unless IPv6 is explicitly requested, assume IPv4 */
2845         if (!dst->remote_ip.sa.sa_family)
2846                 dst->remote_ip.sa.sa_family = AF_INET;
2847
2848         if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2849             vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2850                 if (!IS_ENABLED(CONFIG_IPV6))
2851                         return -EPFNOSUPPORT;
2852                 use_ipv6 = true;
2853                 vxlan->flags |= VXLAN_F_IPV6;
2854         }
2855
2856         if (conf->label && !use_ipv6) {
2857                 pr_info("label only supported in use with IPv6\n");
2858                 return -EINVAL;
2859         }
2860
2861         if (conf->remote_ifindex) {
2862                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2863                 dst->remote_ifindex = conf->remote_ifindex;
2864
2865                 if (!lowerdev) {
2866                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2867                         return -ENODEV;
2868                 }
2869
2870 #if IS_ENABLED(CONFIG_IPV6)
2871                 if (use_ipv6) {
2872                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2873                         if (idev && idev->cnf.disable_ipv6) {
2874                                 pr_info("IPv6 is disabled via sysctl\n");
2875                                 return -EPERM;
2876                         }
2877                 }
2878 #endif
2879
2880                 if (!conf->mtu)
2881                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2882
2883                 needed_headroom = lowerdev->hard_header_len;
2884         }
2885
2886         if (conf->mtu) {
2887                 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2888                 if (err)
2889                         return err;
2890         }
2891
2892         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2893                 needed_headroom += VXLAN6_HEADROOM;
2894         else
2895                 needed_headroom += VXLAN_HEADROOM;
2896         dev->needed_headroom = needed_headroom;
2897
2898         memcpy(&vxlan->cfg, conf, sizeof(*conf));
2899         if (!vxlan->cfg.dst_port) {
2900                 if (conf->flags & VXLAN_F_GPE)
2901                         vxlan->cfg.dst_port = 4790; /* IANA assigned VXLAN-GPE port */
2902                 else
2903                         vxlan->cfg.dst_port = default_port;
2904         }
2905         vxlan->flags |= conf->flags;
2906
2907         if (!vxlan->cfg.age_interval)
2908                 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2909
2910         list_for_each_entry(tmp, &vn->vxlan_list, next) {
2911                 if (tmp->cfg.vni == conf->vni &&
2912                     (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2913                      tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2914                     tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2915                     (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2916                     (vxlan->flags & VXLAN_F_RCV_FLAGS))
2917                 return -EEXIST;
2918         }
2919
2920         dev->ethtool_ops = &vxlan_ethtool_ops;
2921
2922         /* create an fdb entry for a valid default destination */
2923         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2924                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2925                                        &vxlan->default_dst.remote_ip,
2926                                        NUD_REACHABLE|NUD_PERMANENT,
2927                                        NLM_F_EXCL|NLM_F_CREATE,
2928                                        vxlan->cfg.dst_port,
2929                                        vxlan->default_dst.remote_vni,
2930                                        vxlan->default_dst.remote_ifindex,
2931                                        NTF_SELF);
2932                 if (err)
2933                         return err;
2934         }
2935
2936         err = register_netdevice(dev);
2937         if (err) {
2938                 vxlan_fdb_delete_default(vxlan);
2939                 return err;
2940         }
2941
2942         list_add(&vxlan->next, &vn->vxlan_list);
2943
2944         return 0;
2945 }
2946
2947 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2948                                     u8 name_assign_type, struct vxlan_config *conf)
2949 {
2950         struct nlattr *tb[IFLA_MAX+1];
2951         struct net_device *dev;
2952         int err;
2953
2954         memset(&tb, 0, sizeof(tb));
2955
2956         dev = rtnl_create_link(net, name, name_assign_type,
2957                                &vxlan_link_ops, tb);
2958         if (IS_ERR(dev))
2959                 return dev;
2960
2961         err = vxlan_dev_configure(net, dev, conf);
2962         if (err < 0) {
2963                 free_netdev(dev);
2964                 return ERR_PTR(err);
2965         }
2966
2967         return dev;
2968 }
2969 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2970
2971 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2972                          struct nlattr *tb[], struct nlattr *data[])
2973 {
2974         struct vxlan_config conf;
2975         int err;
2976
2977         memset(&conf, 0, sizeof(conf));
2978
2979         if (data[IFLA_VXLAN_ID])
2980                 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2981
2982         if (data[IFLA_VXLAN_GROUP]) {
2983                 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2984         } else if (data[IFLA_VXLAN_GROUP6]) {
2985                 if (!IS_ENABLED(CONFIG_IPV6))
2986                         return -EPFNOSUPPORT;
2987
2988                 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2989                 conf.remote_ip.sa.sa_family = AF_INET6;
2990         }
2991
2992         if (data[IFLA_VXLAN_LOCAL]) {
2993                 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2994                 conf.saddr.sa.sa_family = AF_INET;
2995         } else if (data[IFLA_VXLAN_LOCAL6]) {
2996                 if (!IS_ENABLED(CONFIG_IPV6))
2997                         return -EPFNOSUPPORT;
2998
2999                 /* TODO: respect scope id */
3000                 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3001                 conf.saddr.sa.sa_family = AF_INET6;
3002         }
3003
3004         if (data[IFLA_VXLAN_LINK])
3005                 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3006
3007         if (data[IFLA_VXLAN_TOS])
3008                 conf.tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
3009
3010         if (data[IFLA_VXLAN_TTL])
3011                 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3012
3013         if (data[IFLA_VXLAN_LABEL])
3014                 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3015                              IPV6_FLOWLABEL_MASK;
3016
3017         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3018                 conf.flags |= VXLAN_F_LEARN;
3019
3020         if (data[IFLA_VXLAN_AGEING])
3021                 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3022
3023         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
3024                 conf.flags |= VXLAN_F_PROXY;
3025
3026         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
3027                 conf.flags |= VXLAN_F_RSC;
3028
3029         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3030                 conf.flags |= VXLAN_F_L2MISS;
3031
3032         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3033                 conf.flags |= VXLAN_F_L3MISS;
3034
3035         if (data[IFLA_VXLAN_LIMIT])
3036                 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3037
3038         if (data[IFLA_VXLAN_COLLECT_METADATA] &&
3039             nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3040                 conf.flags |= VXLAN_F_COLLECT_METADATA;
3041
3042         if (data[IFLA_VXLAN_PORT_RANGE]) {
3043                 const struct ifla_vxlan_port_range *p
3044                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3045                 conf.port_min = ntohs(p->low);
3046                 conf.port_max = ntohs(p->high);
3047         }
3048
3049         if (data[IFLA_VXLAN_PORT])
3050                 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3051
3052         if (data[IFLA_VXLAN_UDP_CSUM] &&
3053             !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3054                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3055
3056         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
3057             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3058                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3059
3060         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3061             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3062                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3063
3064         if (data[IFLA_VXLAN_REMCSUM_TX] &&
3065             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3066                 conf.flags |= VXLAN_F_REMCSUM_TX;
3067
3068         if (data[IFLA_VXLAN_REMCSUM_RX] &&
3069             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3070                 conf.flags |= VXLAN_F_REMCSUM_RX;
3071
3072         if (data[IFLA_VXLAN_GBP])
3073                 conf.flags |= VXLAN_F_GBP;
3074
3075         if (data[IFLA_VXLAN_GPE])
3076                 conf.flags |= VXLAN_F_GPE;
3077
3078         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3079                 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3080
3081         err = vxlan_dev_configure(src_net, dev, &conf);
3082         switch (err) {
3083         case -ENODEV:
3084                 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
3085                 break;
3086
3087         case -EPERM:
3088                 pr_info("IPv6 is disabled via sysctl\n");
3089                 break;
3090
3091         case -EEXIST:
3092                 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
3093                 break;
3094
3095         case -EINVAL:
3096                 pr_info("unsupported combination of extensions\n");
3097                 break;
3098         }
3099
3100         return err;
3101 }
3102
3103 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3104 {
3105         struct vxlan_dev *vxlan = netdev_priv(dev);
3106         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3107
3108         spin_lock(&vn->sock_lock);
3109         if (!hlist_unhashed(&vxlan->hlist))
3110                 hlist_del_rcu(&vxlan->hlist);
3111         spin_unlock(&vn->sock_lock);
3112
3113         gro_cells_destroy(&vxlan->gro_cells);
3114         list_del(&vxlan->next);
3115         unregister_netdevice_queue(dev, head);
3116 }
3117
3118 static size_t vxlan_get_size(const struct net_device *dev)
3119 {
3120
3121         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
3122                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3123                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3124                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3125                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3126                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3127                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3128                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3129                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3130                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3131                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3132                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3133                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3134                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3135                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3136                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3137                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3138                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3139                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3140                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3141                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3142                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3143                 0;
3144 }
3145
3146 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3147 {
3148         const struct vxlan_dev *vxlan = netdev_priv(dev);
3149         const struct vxlan_rdst *dst = &vxlan->default_dst;
3150         struct ifla_vxlan_port_range ports = {
3151                 .low =  htons(vxlan->cfg.port_min),
3152                 .high = htons(vxlan->cfg.port_max),
3153         };
3154
3155         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3156                 goto nla_put_failure;
3157
3158         if (!vxlan_addr_any(&dst->remote_ip)) {
3159                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3160                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3161                                             dst->remote_ip.sin.sin_addr.s_addr))
3162                                 goto nla_put_failure;
3163 #if IS_ENABLED(CONFIG_IPV6)
3164                 } else {
3165                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3166                                              &dst->remote_ip.sin6.sin6_addr))
3167                                 goto nla_put_failure;
3168 #endif
3169                 }
3170         }
3171
3172         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3173                 goto nla_put_failure;
3174
3175         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3176                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3177                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3178                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3179                                 goto nla_put_failure;
3180 #if IS_ENABLED(CONFIG_IPV6)
3181                 } else {
3182                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3183                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3184                                 goto nla_put_failure;
3185 #endif
3186                 }
3187         }
3188
3189         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3190             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3191             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3192             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3193                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
3194             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3195                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
3196             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3197             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3198                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3199             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3200                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3201             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3202                        !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3203             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3204             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3205             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3206             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3207                         !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3208             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3209                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3210             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3211                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3212             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3213                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3214             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3215                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3216                 goto nla_put_failure;
3217
3218         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3219                 goto nla_put_failure;
3220
3221         if (vxlan->flags & VXLAN_F_GBP &&
3222             nla_put_flag(skb, IFLA_VXLAN_GBP))
3223                 goto nla_put_failure;
3224
3225         if (vxlan->flags & VXLAN_F_GPE &&
3226             nla_put_flag(skb, IFLA_VXLAN_GPE))
3227                 goto nla_put_failure;
3228
3229         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3230             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3231                 goto nla_put_failure;
3232
3233         return 0;
3234
3235 nla_put_failure:
3236         return -EMSGSIZE;
3237 }
3238
3239 static struct net *vxlan_get_link_net(const struct net_device *dev)
3240 {
3241         struct vxlan_dev *vxlan = netdev_priv(dev);
3242
3243         return vxlan->net;
3244 }
3245
3246 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3247         .kind           = "vxlan",
3248         .maxtype        = IFLA_VXLAN_MAX,
3249         .policy         = vxlan_policy,
3250         .priv_size      = sizeof(struct vxlan_dev),
3251         .setup          = vxlan_setup,
3252         .validate       = vxlan_validate,
3253         .newlink        = vxlan_newlink,
3254         .dellink        = vxlan_dellink,
3255         .get_size       = vxlan_get_size,
3256         .fill_info      = vxlan_fill_info,
3257         .get_link_net   = vxlan_get_link_net,
3258 };
3259
3260 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3261                                              struct net_device *dev)
3262 {
3263         struct vxlan_dev *vxlan, *next;
3264         LIST_HEAD(list_kill);
3265
3266         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3267                 struct vxlan_rdst *dst = &vxlan->default_dst;
3268
3269                 /* In case we created vxlan device with carrier
3270                  * and we loose the carrier due to module unload
3271                  * we also need to remove vxlan device. In other
3272                  * cases, it's not necessary and remote_ifindex
3273                  * is 0 here, so no matches.
3274                  */
3275                 if (dst->remote_ifindex == dev->ifindex)
3276                         vxlan_dellink(vxlan->dev, &list_kill);
3277         }
3278
3279         unregister_netdevice_many(&list_kill);
3280 }
3281
3282 static int vxlan_lowerdev_event(struct notifier_block *unused,
3283                                 unsigned long event, void *ptr)
3284 {
3285         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3286         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3287
3288         if (event == NETDEV_UNREGISTER)
3289                 vxlan_handle_lowerdev_unregister(vn, dev);
3290
3291         return NOTIFY_DONE;
3292 }
3293
3294 static struct notifier_block vxlan_notifier_block __read_mostly = {
3295         .notifier_call = vxlan_lowerdev_event,
3296 };
3297
3298 static __net_init int vxlan_init_net(struct net *net)
3299 {
3300         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3301         unsigned int h;
3302
3303         INIT_LIST_HEAD(&vn->vxlan_list);
3304         spin_lock_init(&vn->sock_lock);
3305
3306         for (h = 0; h < PORT_HASH_SIZE; ++h)
3307                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3308
3309         return 0;
3310 }
3311
3312 static void __net_exit vxlan_exit_net(struct net *net)
3313 {
3314         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3315         struct vxlan_dev *vxlan, *next;
3316         struct net_device *dev, *aux;
3317         LIST_HEAD(list);
3318
3319         rtnl_lock();
3320         for_each_netdev_safe(net, dev, aux)
3321                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3322                         unregister_netdevice_queue(dev, &list);
3323
3324         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3325                 /* If vxlan->dev is in the same netns, it has already been added
3326                  * to the list by the previous loop.
3327                  */
3328                 if (!net_eq(dev_net(vxlan->dev), net)) {
3329                         gro_cells_destroy(&vxlan->gro_cells);
3330                         unregister_netdevice_queue(vxlan->dev, &list);
3331                 }
3332         }
3333
3334         unregister_netdevice_many(&list);
3335         rtnl_unlock();
3336 }
3337
3338 static struct pernet_operations vxlan_net_ops = {
3339         .init = vxlan_init_net,
3340         .exit = vxlan_exit_net,
3341         .id   = &vxlan_net_id,
3342         .size = sizeof(struct vxlan_net),
3343 };
3344
3345 static int __init vxlan_init_module(void)
3346 {
3347         int rc;
3348
3349         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3350         if (!vxlan_wq)
3351                 return -ENOMEM;
3352
3353         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3354
3355         rc = register_pernet_subsys(&vxlan_net_ops);
3356         if (rc)
3357                 goto out1;
3358
3359         rc = register_netdevice_notifier(&vxlan_notifier_block);
3360         if (rc)
3361                 goto out2;
3362
3363         rc = rtnl_link_register(&vxlan_link_ops);
3364         if (rc)
3365                 goto out3;
3366
3367         return 0;
3368 out3:
3369         unregister_netdevice_notifier(&vxlan_notifier_block);
3370 out2:
3371         unregister_pernet_subsys(&vxlan_net_ops);
3372 out1:
3373         destroy_workqueue(vxlan_wq);
3374         return rc;
3375 }
3376 late_initcall(vxlan_init_module);
3377
3378 static void __exit vxlan_cleanup_module(void)
3379 {
3380         rtnl_link_unregister(&vxlan_link_ops);
3381         unregister_netdevice_notifier(&vxlan_notifier_block);
3382         destroy_workqueue(vxlan_wq);
3383         unregister_pernet_subsys(&vxlan_net_ops);
3384         /* rcu_barrier() is called by netns */
3385 }
3386 module_exit(vxlan_cleanup_module);
3387
3388 MODULE_LICENSE("GPL");
3389 MODULE_VERSION(VXLAN_VERSION);
3390 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3391 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3392 MODULE_ALIAS_RTNL_LINK("vxlan");