1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * VXLAN: Virtual eXtensible Local Area Network 4 * 5 * Copyright (c) 2012-2013 Vyatta Inc. 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/errno.h> 13 #include <linux/slab.h> 14 #include <linux/udp.h> 15 #include <linux/igmp.h> 16 #include <linux/if_ether.h> 17 #include <linux/ethtool.h> 18 #include <linux/rhashtable.h> 19 #include <net/arp.h> 20 #include <net/ndisc.h> 21 #include <net/gro.h> 22 #include <net/ipv6_stubs.h> 23 #include <net/ip.h> 24 #include <net/icmp.h> 25 #include <net/rtnetlink.h> 26 #include <net/inet_ecn.h> 27 #include <net/net_namespace.h> 28 #include <net/netns/generic.h> 29 #include <net/netdev_lock.h> 30 #include <net/tun_proto.h> 31 #include <net/vxlan.h> 32 #include <net/nexthop.h> 33 34 #if IS_ENABLED(CONFIG_IPV6) 35 #include <net/ip6_tunnel.h> 36 #include <net/ip6_checksum.h> 37 #endif 38 39 #include "vxlan_private.h" 40 41 #define VXLAN_VERSION "0.1" 42 43 #define FDB_AGE_DEFAULT 300 /* 5 min */ 44 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ 45 46 /* UDP port for VXLAN traffic. 47 * The IANA assigned port is 4789, but the Linux default is 8472 48 * for compatibility with early adopters. 49 */ 50 static unsigned short vxlan_port __read_mostly = 8472; 51 module_param_named(udp_port, vxlan_port, ushort, 0444); 52 MODULE_PARM_DESC(udp_port, "Destination UDP port"); 53 54 static bool log_ecn_error = true; 55 module_param(log_ecn_error, bool, 0644); 56 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 57 58 unsigned int vxlan_net_id; 59 60 const u8 all_zeros_mac[ETH_ALEN + 2]; 61 static struct rtnl_link_ops vxlan_link_ops; 62 63 static int vxlan_sock_add(struct vxlan_dev *vxlan); 64 65 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan); 66 67 static const struct rhashtable_params vxlan_fdb_rht_params = { 68 .head_offset = offsetof(struct vxlan_fdb, rhnode), 69 .key_offset = offsetof(struct vxlan_fdb, key), 70 .key_len = sizeof(struct vxlan_fdb_key), 71 .automatic_shrinking = true, 72 }; 73 74 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs) 75 { 76 return vs->flags & VXLAN_F_COLLECT_METADATA || 77 ip_tunnel_collect_metadata(); 78 } 79 80 /* Find VXLAN socket based on network namespace, address family, UDP port, 81 * enabled unshareable flags and socket device binding (see l3mdev with 82 * non-default VRF). 83 */ 84 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family, 85 __be16 port, u32 flags, int ifindex) 86 { 87 struct vxlan_sock *vs; 88 89 flags &= VXLAN_F_RCV_FLAGS; 90 91 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { 92 if (inet_sk(vs->sock->sk)->inet_sport == port && 93 vxlan_get_sk_family(vs) == family && 94 vs->flags == flags && 95 vs->sock->sk->sk_bound_dev_if == ifindex) 96 return vs; 97 } 98 return NULL; 99 } 100 101 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, 102 int ifindex, __be32 vni, 103 struct vxlan_vni_node **vninode) 104 { 105 struct vxlan_vni_node *vnode; 106 struct vxlan_dev_node *node; 107 108 /* For flow based devices, map all packets to VNI 0 */ 109 if (vs->flags & VXLAN_F_COLLECT_METADATA && 110 !(vs->flags & VXLAN_F_VNIFILTER)) 111 vni = 0; 112 113 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) { 114 if (!node->vxlan) 115 continue; 116 vnode = NULL; 117 if (node->vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 118 vnode = vxlan_vnifilter_lookup(node->vxlan, vni); 119 if (!vnode) 120 continue; 121 } else if (node->vxlan->default_dst.remote_vni != vni) { 122 continue; 123 } 124 125 if (IS_ENABLED(CONFIG_IPV6)) { 126 const struct vxlan_config *cfg = &node->vxlan->cfg; 127 128 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) && 129 cfg->remote_ifindex != ifindex) 130 continue; 131 } 132 133 if (vninode) 134 *vninode = vnode; 135 return node->vxlan; 136 } 137 138 return NULL; 139 } 140 141 /* Look up VNI in a per net namespace table */ 142 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex, 143 __be32 vni, sa_family_t family, 144 __be16 port, u32 flags) 145 { 146 struct vxlan_sock *vs; 147 148 vs = vxlan_find_sock(net, family, port, flags, ifindex); 149 if (!vs) 150 return NULL; 151 152 return vxlan_vs_find_vni(vs, ifindex, vni, NULL); 153 } 154 155 /* Fill in neighbour message in skbuff. */ 156 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, 157 const struct vxlan_fdb *fdb, 158 u32 portid, u32 seq, int type, unsigned int flags, 159 const struct vxlan_rdst *rdst) 160 { 161 unsigned long now = jiffies; 162 struct nda_cacheinfo ci; 163 bool send_ip, send_eth; 164 struct nlmsghdr *nlh; 165 struct nexthop *nh; 166 struct ndmsg *ndm; 167 int nh_family; 168 u32 nh_id; 169 170 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); 171 if (nlh == NULL) 172 return -EMSGSIZE; 173 174 ndm = nlmsg_data(nlh); 175 memset(ndm, 0, sizeof(*ndm)); 176 177 send_eth = send_ip = true; 178 179 rcu_read_lock(); 180 nh = rcu_dereference(fdb->nh); 181 if (nh) { 182 nh_family = nexthop_get_family(nh); 183 nh_id = nh->id; 184 } 185 rcu_read_unlock(); 186 187 if (type == RTM_GETNEIGH) { 188 if (rdst) { 189 send_ip = !vxlan_addr_any(&rdst->remote_ip); 190 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET; 191 } else if (nh) { 192 ndm->ndm_family = nh_family; 193 } 194 send_eth = !is_zero_ether_addr(fdb->key.eth_addr); 195 } else 196 ndm->ndm_family = AF_BRIDGE; 197 ndm->ndm_state = fdb->state; 198 ndm->ndm_ifindex = vxlan->dev->ifindex; 199 ndm->ndm_flags = fdb->flags; 200 if (rdst && rdst->offloaded) 201 ndm->ndm_flags |= NTF_OFFLOADED; 202 ndm->ndm_type = RTN_UNICAST; 203 204 if (!net_eq(dev_net(vxlan->dev), vxlan->net) && 205 nla_put_s32(skb, NDA_LINK_NETNSID, 206 peernet2id(dev_net(vxlan->dev), vxlan->net))) 207 goto nla_put_failure; 208 209 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.eth_addr)) 210 goto nla_put_failure; 211 if (nh) { 212 if (nla_put_u32(skb, NDA_NH_ID, nh_id)) 213 goto nla_put_failure; 214 } else if (rdst) { 215 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, 216 &rdst->remote_ip)) 217 goto nla_put_failure; 218 219 if (rdst->remote_port && 220 rdst->remote_port != vxlan->cfg.dst_port && 221 nla_put_be16(skb, NDA_PORT, rdst->remote_port)) 222 goto nla_put_failure; 223 if (rdst->remote_vni != vxlan->default_dst.remote_vni && 224 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni))) 225 goto nla_put_failure; 226 if (rdst->remote_ifindex && 227 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) 228 goto nla_put_failure; 229 } 230 231 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->key.vni && 232 nla_put_u32(skb, NDA_SRC_VNI, 233 be32_to_cpu(fdb->key.vni))) 234 goto nla_put_failure; 235 236 ci.ndm_used = jiffies_to_clock_t(now - READ_ONCE(fdb->used)); 237 ci.ndm_confirmed = 0; 238 ci.ndm_updated = jiffies_to_clock_t(now - READ_ONCE(fdb->updated)); 239 ci.ndm_refcnt = 0; 240 241 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) 242 goto nla_put_failure; 243 244 nlmsg_end(skb, nlh); 245 return 0; 246 247 nla_put_failure: 248 nlmsg_cancel(skb, nlh); 249 return -EMSGSIZE; 250 } 251 252 static inline size_t vxlan_nlmsg_size(void) 253 { 254 return NLMSG_ALIGN(sizeof(struct ndmsg)) 255 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ 256 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */ 257 + nla_total_size(sizeof(__be16)) /* NDA_PORT */ 258 + nla_total_size(sizeof(__be32)) /* NDA_VNI */ 259 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ 260 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */ 261 + nla_total_size(sizeof(struct nda_cacheinfo)); 262 } 263 264 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 265 struct vxlan_rdst *rd, int type) 266 { 267 struct net *net = dev_net(vxlan->dev); 268 struct sk_buff *skb; 269 int err = -ENOBUFS; 270 271 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); 272 if (skb == NULL) 273 goto errout; 274 275 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd); 276 if (err < 0) { 277 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ 278 WARN_ON(err == -EMSGSIZE); 279 kfree_skb(skb); 280 goto errout; 281 } 282 283 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 284 return; 285 errout: 286 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 287 } 288 289 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan, 290 const struct vxlan_fdb *fdb, 291 const struct vxlan_rdst *rd, 292 struct netlink_ext_ack *extack, 293 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 294 { 295 fdb_info->info.dev = vxlan->dev; 296 fdb_info->info.extack = extack; 297 fdb_info->remote_ip = rd->remote_ip; 298 fdb_info->remote_port = rd->remote_port; 299 fdb_info->remote_vni = rd->remote_vni; 300 fdb_info->remote_ifindex = rd->remote_ifindex; 301 memcpy(fdb_info->eth_addr, fdb->key.eth_addr, ETH_ALEN); 302 fdb_info->vni = fdb->key.vni; 303 fdb_info->offloaded = rd->offloaded; 304 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER; 305 } 306 307 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan, 308 struct vxlan_fdb *fdb, 309 struct vxlan_rdst *rd, 310 bool adding, 311 struct netlink_ext_ack *extack) 312 { 313 struct switchdev_notifier_vxlan_fdb_info info; 314 enum switchdev_notifier_type notifier_type; 315 int ret; 316 317 if (WARN_ON(!rd)) 318 return 0; 319 320 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE 321 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE; 322 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info); 323 ret = call_switchdev_notifiers(notifier_type, vxlan->dev, 324 &info.info, extack); 325 return notifier_to_errno(ret); 326 } 327 328 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 329 struct vxlan_rdst *rd, int type, bool swdev_notify, 330 struct netlink_ext_ack *extack) 331 { 332 int err; 333 334 if (swdev_notify && rd) { 335 switch (type) { 336 case RTM_NEWNEIGH: 337 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 338 true, extack); 339 if (err) 340 return err; 341 break; 342 case RTM_DELNEIGH: 343 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 344 false, extack); 345 break; 346 } 347 } 348 349 __vxlan_fdb_notify(vxlan, fdb, rd, type); 350 return 0; 351 } 352 353 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa) 354 { 355 struct vxlan_dev *vxlan = netdev_priv(dev); 356 struct vxlan_fdb f = { 357 .state = NUD_STALE, 358 }; 359 struct vxlan_rdst remote = { 360 .remote_ip = *ipa, /* goes to NDA_DST */ 361 .remote_vni = cpu_to_be32(VXLAN_N_VID), 362 }; 363 364 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 365 } 366 367 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) 368 { 369 struct vxlan_fdb f = { 370 .state = NUD_STALE, 371 }; 372 struct vxlan_rdst remote = { }; 373 374 memcpy(f.key.eth_addr, eth_addr, ETH_ALEN); 375 376 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 377 } 378 379 /* Look up Ethernet address in forwarding table */ 380 static struct vxlan_fdb *vxlan_find_mac_rcu(struct vxlan_dev *vxlan, 381 const u8 *mac, __be32 vni) 382 { 383 struct vxlan_fdb_key key; 384 385 memset(&key, 0, sizeof(key)); 386 memcpy(key.eth_addr, mac, sizeof(key.eth_addr)); 387 if (!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) 388 key.vni = vxlan->default_dst.remote_vni; 389 else 390 key.vni = vni; 391 392 return rhashtable_lookup(&vxlan->fdb_hash_tbl, &key, 393 vxlan_fdb_rht_params); 394 } 395 396 static struct vxlan_fdb *vxlan_find_mac_tx(struct vxlan_dev *vxlan, 397 const u8 *mac, __be32 vni) 398 { 399 struct vxlan_fdb *f; 400 401 f = vxlan_find_mac_rcu(vxlan, mac, vni); 402 if (f) { 403 unsigned long now = jiffies; 404 405 if (READ_ONCE(f->used) != now) 406 WRITE_ONCE(f->used, now); 407 } 408 409 return f; 410 } 411 412 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, 413 const u8 *mac, __be32 vni) 414 { 415 struct vxlan_fdb *f; 416 417 lockdep_assert_held_once(&vxlan->hash_lock); 418 419 rcu_read_lock(); 420 f = vxlan_find_mac_rcu(vxlan, mac, vni); 421 rcu_read_unlock(); 422 423 return f; 424 } 425 426 /* caller should hold vxlan->hash_lock */ 427 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f, 428 union vxlan_addr *ip, __be16 port, 429 __be32 vni, __u32 ifindex) 430 { 431 struct vxlan_rdst *rd; 432 433 list_for_each_entry(rd, &f->remotes, list) { 434 if (vxlan_addr_equal(&rd->remote_ip, ip) && 435 rd->remote_port == port && 436 rd->remote_vni == vni && 437 rd->remote_ifindex == ifindex) 438 return rd; 439 } 440 441 return NULL; 442 } 443 444 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, 445 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 446 { 447 struct vxlan_dev *vxlan = netdev_priv(dev); 448 u8 eth_addr[ETH_ALEN + 2] = { 0 }; 449 struct vxlan_rdst *rdst = NULL; 450 struct vxlan_fdb *f; 451 int rc = 0; 452 453 if (is_multicast_ether_addr(mac) || 454 is_zero_ether_addr(mac)) 455 return -EINVAL; 456 457 ether_addr_copy(eth_addr, mac); 458 459 rcu_read_lock(); 460 461 f = vxlan_find_mac_rcu(vxlan, eth_addr, vni); 462 if (f) 463 rdst = first_remote_rcu(f); 464 if (!rdst) { 465 rc = -ENOENT; 466 goto out; 467 } 468 469 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info); 470 471 out: 472 rcu_read_unlock(); 473 return rc; 474 } 475 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc); 476 477 static int vxlan_fdb_notify_one(struct notifier_block *nb, 478 const struct vxlan_dev *vxlan, 479 const struct vxlan_fdb *f, 480 const struct vxlan_rdst *rdst, 481 struct netlink_ext_ack *extack) 482 { 483 struct switchdev_notifier_vxlan_fdb_info fdb_info; 484 int rc; 485 486 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info); 487 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE, 488 &fdb_info); 489 return notifier_to_errno(rc); 490 } 491 492 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, 493 struct notifier_block *nb, 494 struct netlink_ext_ack *extack) 495 { 496 struct vxlan_dev *vxlan; 497 struct vxlan_rdst *rdst; 498 struct vxlan_fdb *f; 499 int rc = 0; 500 501 if (!netif_is_vxlan(dev)) 502 return -EINVAL; 503 vxlan = netdev_priv(dev); 504 505 spin_lock_bh(&vxlan->hash_lock); 506 hlist_for_each_entry(f, &vxlan->fdb_list, fdb_node) { 507 if (f->key.vni == vni) { 508 list_for_each_entry(rdst, &f->remotes, list) { 509 rc = vxlan_fdb_notify_one(nb, vxlan, f, rdst, 510 extack); 511 if (rc) 512 goto unlock; 513 } 514 } 515 } 516 spin_unlock_bh(&vxlan->hash_lock); 517 return 0; 518 519 unlock: 520 spin_unlock_bh(&vxlan->hash_lock); 521 return rc; 522 } 523 EXPORT_SYMBOL_GPL(vxlan_fdb_replay); 524 525 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) 526 { 527 struct vxlan_dev *vxlan; 528 struct vxlan_rdst *rdst; 529 struct vxlan_fdb *f; 530 531 if (!netif_is_vxlan(dev)) 532 return; 533 vxlan = netdev_priv(dev); 534 535 spin_lock_bh(&vxlan->hash_lock); 536 hlist_for_each_entry(f, &vxlan->fdb_list, fdb_node) { 537 if (f->key.vni == vni) { 538 list_for_each_entry(rdst, &f->remotes, list) 539 rdst->offloaded = false; 540 } 541 } 542 spin_unlock_bh(&vxlan->hash_lock); 543 544 } 545 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload); 546 547 /* Replace destination of unicast mac */ 548 static int vxlan_fdb_replace(struct vxlan_fdb *f, 549 union vxlan_addr *ip, __be16 port, __be32 vni, 550 __u32 ifindex, struct vxlan_rdst *oldrd) 551 { 552 struct vxlan_rdst *rd; 553 554 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 555 if (rd) 556 return 0; 557 558 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list); 559 if (!rd) 560 return 0; 561 562 *oldrd = *rd; 563 dst_cache_reset(&rd->dst_cache); 564 rd->remote_ip = *ip; 565 rd->remote_port = port; 566 rd->remote_vni = vni; 567 rd->remote_ifindex = ifindex; 568 rd->offloaded = false; 569 return 1; 570 } 571 572 /* Add/update destinations for multicast */ 573 static int vxlan_fdb_append(struct vxlan_fdb *f, 574 union vxlan_addr *ip, __be16 port, __be32 vni, 575 __u32 ifindex, struct vxlan_rdst **rdp) 576 { 577 struct vxlan_rdst *rd; 578 579 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 580 if (rd) 581 return 0; 582 583 rd = kmalloc_obj(*rd, GFP_ATOMIC); 584 if (rd == NULL) 585 return -ENOMEM; 586 587 /* The driver can work correctly without a dst cache, so do not treat 588 * dst cache initialization errors as fatal. 589 */ 590 dst_cache_init(&rd->dst_cache, GFP_ATOMIC | __GFP_NOWARN); 591 592 rd->remote_ip = *ip; 593 rd->remote_port = port; 594 rd->offloaded = false; 595 rd->remote_vni = vni; 596 rd->remote_ifindex = ifindex; 597 598 list_add_tail_rcu(&rd->list, &f->remotes); 599 600 *rdp = rd; 601 return 1; 602 } 603 604 static bool vxlan_parse_gpe_proto(const struct vxlanhdr *hdr, __be16 *protocol) 605 { 606 const struct vxlanhdr_gpe *gpe = (const struct vxlanhdr_gpe *)hdr; 607 608 /* Need to have Next Protocol set for interfaces in GPE mode. */ 609 if (!gpe->np_applied) 610 return false; 611 /* "The initial version is 0. If a receiver does not support the 612 * version indicated it MUST drop the packet. 613 */ 614 if (gpe->version != 0) 615 return false; 616 /* "When the O bit is set to 1, the packet is an OAM packet and OAM 617 * processing MUST occur." However, we don't implement OAM 618 * processing, thus drop the packet. 619 */ 620 if (gpe->oam_flag) 621 return false; 622 623 *protocol = tun_p_to_eth_p(gpe->next_protocol); 624 if (!*protocol) 625 return false; 626 627 return true; 628 } 629 630 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb, 631 unsigned int off, 632 struct vxlanhdr *vh, size_t hdrlen, 633 __be32 vni_field, 634 struct gro_remcsum *grc, 635 bool nopartial) 636 { 637 size_t start, offset; 638 639 if (skb->remcsum_offload) 640 return vh; 641 642 if (!NAPI_GRO_CB(skb)->csum_valid) 643 return NULL; 644 645 start = vxlan_rco_start(vni_field); 646 offset = start + vxlan_rco_offset(vni_field); 647 648 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen, 649 start, offset, grc, nopartial); 650 651 skb->remcsum_offload = 1; 652 653 return vh; 654 } 655 656 static struct vxlanhdr *vxlan_gro_prepare_receive(struct sock *sk, 657 struct list_head *head, 658 struct sk_buff *skb, 659 struct gro_remcsum *grc) 660 { 661 struct sk_buff *p; 662 struct vxlanhdr *vh, *vh2; 663 unsigned int hlen, off_vx; 664 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk); 665 __be32 flags; 666 667 skb_gro_remcsum_init(grc); 668 669 off_vx = skb_gro_offset(skb); 670 hlen = off_vx + sizeof(*vh); 671 vh = skb_gro_header(skb, hlen, off_vx); 672 if (unlikely(!vh)) 673 return NULL; 674 675 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr)); 676 677 flags = vh->vx_flags; 678 679 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) { 680 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr), 681 vh->vx_vni, grc, 682 !!(vs->flags & 683 VXLAN_F_REMCSUM_NOPARTIAL)); 684 685 if (!vh) 686 return NULL; 687 } 688 689 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */ 690 691 list_for_each_entry(p, head, list) { 692 if (!NAPI_GRO_CB(p)->same_flow) 693 continue; 694 695 vh2 = (struct vxlanhdr *)(p->data + off_vx); 696 if (vh->vx_flags != vh2->vx_flags || 697 vh->vx_vni != vh2->vx_vni) { 698 NAPI_GRO_CB(p)->same_flow = 0; 699 continue; 700 } 701 } 702 703 return vh; 704 } 705 706 static struct sk_buff *vxlan_gro_receive(struct sock *sk, 707 struct list_head *head, 708 struct sk_buff *skb) 709 { 710 struct sk_buff *pp = NULL; 711 struct gro_remcsum grc; 712 int flush = 1; 713 714 if (vxlan_gro_prepare_receive(sk, head, skb, &grc)) { 715 pp = call_gro_receive(eth_gro_receive, head, skb); 716 flush = 0; 717 } 718 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 719 return pp; 720 } 721 722 static struct sk_buff *vxlan_gpe_gro_receive(struct sock *sk, 723 struct list_head *head, 724 struct sk_buff *skb) 725 { 726 const struct packet_offload *ptype; 727 struct sk_buff *pp = NULL; 728 struct gro_remcsum grc; 729 struct vxlanhdr *vh; 730 __be16 protocol; 731 int flush = 1; 732 733 vh = vxlan_gro_prepare_receive(sk, head, skb, &grc); 734 if (vh) { 735 if (!vxlan_parse_gpe_proto(vh, &protocol)) 736 goto out; 737 ptype = gro_find_receive_by_type(protocol); 738 if (!ptype) 739 goto out; 740 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 741 flush = 0; 742 } 743 out: 744 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 745 return pp; 746 } 747 748 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 749 { 750 /* Sets 'skb->inner_mac_header' since we are always called with 751 * 'skb->encapsulation' set. 752 */ 753 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 754 } 755 756 static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 757 { 758 struct vxlanhdr *vh = (struct vxlanhdr *)(skb->data + nhoff); 759 const struct packet_offload *ptype; 760 int err = -ENOSYS; 761 __be16 protocol; 762 763 if (!vxlan_parse_gpe_proto(vh, &protocol)) 764 return err; 765 ptype = gro_find_complete_by_type(protocol); 766 if (ptype) 767 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 768 return err; 769 } 770 771 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac, 772 __u16 state, __be32 src_vni, 773 __u16 ndm_flags) 774 { 775 struct vxlan_fdb *f; 776 777 f = kmalloc_obj(*f, GFP_ATOMIC); 778 if (!f) 779 return NULL; 780 memset(&f->key, 0, sizeof(f->key)); 781 f->state = state; 782 f->flags = ndm_flags; 783 f->updated = f->used = jiffies; 784 f->key.vni = src_vni; 785 f->nh = NULL; 786 RCU_INIT_POINTER(f->vdev, vxlan); 787 INIT_LIST_HEAD(&f->nh_list); 788 INIT_LIST_HEAD(&f->remotes); 789 memcpy(f->key.eth_addr, mac, ETH_ALEN); 790 791 return f; 792 } 793 794 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 795 u32 nhid, struct netlink_ext_ack *extack) 796 { 797 struct nexthop *old_nh = rtnl_dereference(fdb->nh); 798 struct nexthop *nh; 799 int err = -EINVAL; 800 801 if (old_nh && old_nh->id == nhid) 802 return 0; 803 804 nh = nexthop_find_by_id(vxlan->net, nhid); 805 if (!nh) { 806 NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); 807 goto err_inval; 808 } 809 810 if (!nexthop_get(nh)) { 811 NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); 812 nh = NULL; 813 goto err_inval; 814 } 815 if (!nexthop_is_fdb(nh)) { 816 NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop"); 817 goto err_inval; 818 } 819 820 if (!nexthop_is_multipath(nh)) { 821 NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group"); 822 goto err_inval; 823 } 824 825 /* check nexthop group family */ 826 switch (vxlan->default_dst.remote_ip.sa.sa_family) { 827 case AF_INET: 828 if (!nexthop_has_v4(nh)) { 829 err = -EAFNOSUPPORT; 830 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 831 goto err_inval; 832 } 833 break; 834 case AF_INET6: 835 if (nexthop_has_v4(nh)) { 836 err = -EAFNOSUPPORT; 837 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 838 goto err_inval; 839 } 840 } 841 842 if (old_nh) { 843 list_del_rcu(&fdb->nh_list); 844 nexthop_put(old_nh); 845 } 846 rcu_assign_pointer(fdb->nh, nh); 847 list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list); 848 return 1; 849 850 err_inval: 851 if (nh) 852 nexthop_put(nh); 853 return err; 854 } 855 856 int vxlan_fdb_create(struct vxlan_dev *vxlan, 857 const u8 *mac, union vxlan_addr *ip, 858 __u16 state, __be16 port, __be32 src_vni, 859 __be32 vni, __u32 ifindex, __u16 ndm_flags, 860 u32 nhid, struct vxlan_fdb **fdb, 861 struct netlink_ext_ack *extack) 862 { 863 struct vxlan_rdst *rd = NULL; 864 struct vxlan_fdb *f; 865 int rc; 866 867 if (vxlan->cfg.addrmax && 868 vxlan->addrcnt >= vxlan->cfg.addrmax) 869 return -ENOSPC; 870 871 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 872 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags); 873 if (!f) 874 return -ENOMEM; 875 876 if (nhid) 877 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 878 else 879 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 880 if (rc < 0) 881 goto errout; 882 883 rc = rhashtable_lookup_insert_fast(&vxlan->fdb_hash_tbl, &f->rhnode, 884 vxlan_fdb_rht_params); 885 if (rc) 886 goto destroy_remote; 887 888 ++vxlan->addrcnt; 889 hlist_add_head_rcu(&f->fdb_node, &vxlan->fdb_list); 890 891 *fdb = f; 892 893 return 0; 894 895 destroy_remote: 896 if (rcu_access_pointer(f->nh)) { 897 list_del_rcu(&f->nh_list); 898 nexthop_put(rtnl_dereference(f->nh)); 899 } else { 900 list_del(&rd->list); 901 dst_cache_destroy(&rd->dst_cache); 902 kfree(rd); 903 } 904 errout: 905 kfree(f); 906 return rc; 907 } 908 909 static void __vxlan_fdb_free(struct vxlan_fdb *f) 910 { 911 struct vxlan_rdst *rd, *nd; 912 struct nexthop *nh; 913 914 nh = rcu_dereference_raw(f->nh); 915 if (nh) { 916 rcu_assign_pointer(f->nh, NULL); 917 rcu_assign_pointer(f->vdev, NULL); 918 nexthop_put(nh); 919 } 920 921 list_for_each_entry_safe(rd, nd, &f->remotes, list) { 922 dst_cache_destroy(&rd->dst_cache); 923 kfree(rd); 924 } 925 kfree(f); 926 } 927 928 static void vxlan_fdb_free(struct rcu_head *head) 929 { 930 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); 931 932 __vxlan_fdb_free(f); 933 } 934 935 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 936 bool do_notify, bool swdev_notify) 937 { 938 struct vxlan_rdst *rd; 939 940 netdev_dbg(vxlan->dev, "delete %pM\n", f->key.eth_addr); 941 942 --vxlan->addrcnt; 943 if (do_notify) { 944 if (rcu_access_pointer(f->nh)) 945 vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH, 946 swdev_notify, NULL); 947 else 948 list_for_each_entry(rd, &f->remotes, list) 949 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, 950 swdev_notify, NULL); 951 } 952 953 hlist_del_init_rcu(&f->fdb_node); 954 rhashtable_remove_fast(&vxlan->fdb_hash_tbl, &f->rhnode, 955 vxlan_fdb_rht_params); 956 list_del_rcu(&f->nh_list); 957 call_rcu(&f->rcu, vxlan_fdb_free); 958 } 959 960 static void vxlan_dst_free(struct rcu_head *head) 961 { 962 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu); 963 964 dst_cache_destroy(&rd->dst_cache); 965 kfree(rd); 966 } 967 968 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan, 969 union vxlan_addr *ip, 970 __u16 state, __u16 flags, 971 __be16 port, __be32 vni, 972 __u32 ifindex, __u16 ndm_flags, 973 struct vxlan_fdb *f, u32 nhid, 974 bool swdev_notify, 975 struct netlink_ext_ack *extack) 976 { 977 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 978 struct vxlan_rdst *rd = NULL; 979 struct vxlan_rdst oldrd; 980 int notify = 0; 981 int rc = 0; 982 int err; 983 984 if (nhid && !rcu_access_pointer(f->nh)) { 985 NL_SET_ERR_MSG(extack, 986 "Cannot replace an existing non nexthop fdb with a nexthop"); 987 return -EOPNOTSUPP; 988 } 989 990 if (nhid && (flags & NLM_F_APPEND)) { 991 NL_SET_ERR_MSG(extack, 992 "Cannot append to a nexthop fdb"); 993 return -EOPNOTSUPP; 994 } 995 996 /* Do not allow an externally learned entry to take over an entry added 997 * by the user. 998 */ 999 if (!(fdb_flags & NTF_EXT_LEARNED) || 1000 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { 1001 if (f->state != state) { 1002 f->state = state; 1003 notify = 1; 1004 } 1005 if (f->flags != fdb_flags) { 1006 f->flags = fdb_flags; 1007 notify = 1; 1008 } 1009 } 1010 1011 if ((flags & NLM_F_REPLACE)) { 1012 /* Only change unicasts */ 1013 if (!(is_multicast_ether_addr(f->key.eth_addr) || 1014 is_zero_ether_addr(f->key.eth_addr))) { 1015 if (nhid) { 1016 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 1017 if (rc < 0) 1018 return rc; 1019 } else { 1020 rc = vxlan_fdb_replace(f, ip, port, vni, 1021 ifindex, &oldrd); 1022 } 1023 notify |= rc; 1024 } else { 1025 NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries"); 1026 return -EOPNOTSUPP; 1027 } 1028 } 1029 if ((flags & NLM_F_APPEND) && 1030 (is_multicast_ether_addr(f->key.eth_addr) || 1031 is_zero_ether_addr(f->key.eth_addr))) { 1032 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 1033 1034 if (rc < 0) 1035 return rc; 1036 notify |= rc; 1037 } 1038 1039 if (ndm_flags & NTF_USE) 1040 WRITE_ONCE(f->updated, jiffies); 1041 1042 if (notify) { 1043 if (rd == NULL) 1044 rd = first_remote_rtnl(f); 1045 1046 WRITE_ONCE(f->updated, jiffies); 1047 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, 1048 swdev_notify, extack); 1049 if (err) 1050 goto err_notify; 1051 } 1052 1053 return 0; 1054 1055 err_notify: 1056 if (nhid) 1057 return err; 1058 if ((flags & NLM_F_REPLACE) && rc) 1059 *rd = oldrd; 1060 else if ((flags & NLM_F_APPEND) && rc) { 1061 list_del_rcu(&rd->list); 1062 call_rcu(&rd->rcu, vxlan_dst_free); 1063 } 1064 return err; 1065 } 1066 1067 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan, 1068 const u8 *mac, union vxlan_addr *ip, 1069 __u16 state, __u16 flags, 1070 __be16 port, __be32 src_vni, __be32 vni, 1071 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1072 bool swdev_notify, 1073 struct netlink_ext_ack *extack) 1074 { 1075 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 1076 struct vxlan_fdb *f; 1077 int rc; 1078 1079 /* Disallow replace to add a multicast entry */ 1080 if ((flags & NLM_F_REPLACE) && 1081 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac))) 1082 return -EOPNOTSUPP; 1083 1084 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 1085 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni, 1086 vni, ifindex, fdb_flags, nhid, &f, extack); 1087 if (rc < 0) 1088 return rc; 1089 1090 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, 1091 swdev_notify, extack); 1092 if (rc) 1093 goto err_notify; 1094 1095 return 0; 1096 1097 err_notify: 1098 vxlan_fdb_destroy(vxlan, f, false, false); 1099 return rc; 1100 } 1101 1102 /* Add new entry to forwarding table -- assumes lock held */ 1103 int vxlan_fdb_update(struct vxlan_dev *vxlan, 1104 const u8 *mac, union vxlan_addr *ip, 1105 __u16 state, __u16 flags, 1106 __be16 port, __be32 src_vni, __be32 vni, 1107 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1108 bool swdev_notify, 1109 struct netlink_ext_ack *extack) 1110 { 1111 struct vxlan_fdb *f; 1112 1113 f = vxlan_find_mac(vxlan, mac, src_vni); 1114 if (f) { 1115 if (flags & NLM_F_EXCL) { 1116 netdev_dbg(vxlan->dev, 1117 "lost race to create %pM\n", mac); 1118 return -EEXIST; 1119 } 1120 1121 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port, 1122 vni, ifindex, ndm_flags, f, 1123 nhid, swdev_notify, extack); 1124 } else { 1125 if (!(flags & NLM_F_CREATE)) 1126 return -ENOENT; 1127 1128 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags, 1129 port, src_vni, vni, ifindex, 1130 ndm_flags, nhid, swdev_notify, 1131 extack); 1132 } 1133 } 1134 1135 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 1136 struct vxlan_rdst *rd, bool swdev_notify) 1137 { 1138 list_del_rcu(&rd->list); 1139 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL); 1140 call_rcu(&rd->rcu, vxlan_dst_free); 1141 } 1142 1143 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, 1144 union vxlan_addr *ip, __be16 *port, __be32 *src_vni, 1145 __be32 *vni, u32 *ifindex, u32 *nhid, 1146 struct netlink_ext_ack *extack) 1147 { 1148 struct net *net = dev_net(vxlan->dev); 1149 int err; 1150 1151 if (tb[NDA_NH_ID] && 1152 (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] || tb[NDA_PORT])) { 1153 NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID"); 1154 return -EINVAL; 1155 } 1156 1157 if (tb[NDA_DST]) { 1158 err = vxlan_nla_get_addr(ip, tb[NDA_DST]); 1159 if (err) { 1160 NL_SET_ERR_MSG(extack, "Unsupported address family"); 1161 return err; 1162 } 1163 } else { 1164 union vxlan_addr *remote = &vxlan->default_dst.remote_ip; 1165 1166 if (remote->sa.sa_family == AF_INET) { 1167 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY); 1168 ip->sa.sa_family = AF_INET; 1169 #if IS_ENABLED(CONFIG_IPV6) 1170 } else { 1171 ip->sin6.sin6_addr = in6addr_any; 1172 ip->sa.sa_family = AF_INET6; 1173 #endif 1174 } 1175 } 1176 1177 if (tb[NDA_PORT]) { 1178 if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) { 1179 NL_SET_ERR_MSG(extack, "Invalid vxlan port"); 1180 return -EINVAL; 1181 } 1182 *port = nla_get_be16(tb[NDA_PORT]); 1183 } else { 1184 *port = vxlan->cfg.dst_port; 1185 } 1186 1187 if (tb[NDA_VNI]) { 1188 if (nla_len(tb[NDA_VNI]) != sizeof(u32)) { 1189 NL_SET_ERR_MSG(extack, "Invalid vni"); 1190 return -EINVAL; 1191 } 1192 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1193 } else { 1194 *vni = vxlan->default_dst.remote_vni; 1195 } 1196 1197 if (tb[NDA_SRC_VNI]) { 1198 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) { 1199 NL_SET_ERR_MSG(extack, "Invalid src vni"); 1200 return -EINVAL; 1201 } 1202 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 1203 } else { 1204 *src_vni = vxlan->default_dst.remote_vni; 1205 } 1206 1207 if (tb[NDA_IFINDEX]) { 1208 struct net_device *tdev; 1209 1210 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) { 1211 NL_SET_ERR_MSG(extack, "Invalid ifindex"); 1212 return -EINVAL; 1213 } 1214 *ifindex = nla_get_u32(tb[NDA_IFINDEX]); 1215 tdev = __dev_get_by_index(net, *ifindex); 1216 if (!tdev) { 1217 NL_SET_ERR_MSG(extack, "Device not found"); 1218 return -EADDRNOTAVAIL; 1219 } 1220 } else { 1221 *ifindex = 0; 1222 } 1223 1224 *nhid = nla_get_u32_default(tb[NDA_NH_ID], 0); 1225 1226 return 0; 1227 } 1228 1229 /* Add static entry (via netlink) */ 1230 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 1231 struct net_device *dev, 1232 const unsigned char *addr, u16 vid, u16 flags, 1233 bool *notified, struct netlink_ext_ack *extack) 1234 { 1235 struct vxlan_dev *vxlan = netdev_priv(dev); 1236 /* struct net *net = dev_net(vxlan->dev); */ 1237 union vxlan_addr ip; 1238 __be16 port; 1239 __be32 src_vni, vni; 1240 u32 ifindex, nhid; 1241 int err; 1242 1243 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { 1244 pr_info("RTM_NEWNEIGH with invalid state %#x\n", 1245 ndm->ndm_state); 1246 return -EINVAL; 1247 } 1248 1249 if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID])) 1250 return -EINVAL; 1251 1252 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1253 &nhid, extack); 1254 if (err) 1255 return err; 1256 1257 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family) 1258 return -EAFNOSUPPORT; 1259 1260 spin_lock_bh(&vxlan->hash_lock); 1261 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags, 1262 port, src_vni, vni, ifindex, 1263 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER, 1264 nhid, true, extack); 1265 spin_unlock_bh(&vxlan->hash_lock); 1266 1267 if (!err) 1268 *notified = true; 1269 1270 return err; 1271 } 1272 1273 int __vxlan_fdb_delete(struct vxlan_dev *vxlan, 1274 const unsigned char *addr, union vxlan_addr ip, 1275 __be16 port, __be32 src_vni, __be32 vni, 1276 u32 ifindex, bool swdev_notify) 1277 { 1278 struct vxlan_rdst *rd = NULL; 1279 struct vxlan_fdb *f; 1280 int err = -ENOENT; 1281 1282 f = vxlan_find_mac(vxlan, addr, src_vni); 1283 if (!f) 1284 return err; 1285 1286 if (!vxlan_addr_any(&ip)) { 1287 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex); 1288 if (!rd) 1289 goto out; 1290 } 1291 1292 /* remove a destination if it's not the only one on the list, 1293 * otherwise destroy the fdb entry 1294 */ 1295 if (rd && !list_is_singular(&f->remotes)) { 1296 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify); 1297 goto out; 1298 } 1299 1300 vxlan_fdb_destroy(vxlan, f, true, swdev_notify); 1301 1302 out: 1303 return 0; 1304 } 1305 1306 /* Delete entry (via netlink) */ 1307 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 1308 struct net_device *dev, 1309 const unsigned char *addr, u16 vid, bool *notified, 1310 struct netlink_ext_ack *extack) 1311 { 1312 struct vxlan_dev *vxlan = netdev_priv(dev); 1313 union vxlan_addr ip; 1314 __be32 src_vni, vni; 1315 u32 ifindex, nhid; 1316 __be16 port; 1317 int err; 1318 1319 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1320 &nhid, extack); 1321 if (err) 1322 return err; 1323 1324 spin_lock_bh(&vxlan->hash_lock); 1325 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex, 1326 true); 1327 spin_unlock_bh(&vxlan->hash_lock); 1328 1329 if (!err) 1330 *notified = true; 1331 1332 return err; 1333 } 1334 1335 /* Dump forwarding table */ 1336 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 1337 struct net_device *dev, 1338 struct net_device *filter_dev, int *idx) 1339 { 1340 struct ndo_fdb_dump_context *ctx = (void *)cb->ctx; 1341 struct vxlan_dev *vxlan = netdev_priv(dev); 1342 struct vxlan_fdb *f; 1343 int err = 0; 1344 1345 rcu_read_lock(); 1346 hlist_for_each_entry_rcu(f, &vxlan->fdb_list, fdb_node) { 1347 struct vxlan_rdst *rd; 1348 1349 if (rcu_access_pointer(f->nh)) { 1350 if (*idx < ctx->fdb_idx) 1351 goto skip_nh; 1352 err = vxlan_fdb_info(skb, vxlan, f, 1353 NETLINK_CB(cb->skb).portid, 1354 cb->nlh->nlmsg_seq, 1355 RTM_NEWNEIGH, NLM_F_MULTI, NULL); 1356 if (err < 0) { 1357 rcu_read_unlock(); 1358 goto out; 1359 } 1360 skip_nh: 1361 *idx += 1; 1362 continue; 1363 } 1364 1365 list_for_each_entry_rcu(rd, &f->remotes, list) { 1366 if (*idx < ctx->fdb_idx) 1367 goto skip; 1368 1369 err = vxlan_fdb_info(skb, vxlan, f, 1370 NETLINK_CB(cb->skb).portid, 1371 cb->nlh->nlmsg_seq, 1372 RTM_NEWNEIGH, NLM_F_MULTI, rd); 1373 if (err < 0) { 1374 rcu_read_unlock(); 1375 goto out; 1376 } 1377 skip: 1378 *idx += 1; 1379 } 1380 } 1381 rcu_read_unlock(); 1382 out: 1383 return err; 1384 } 1385 1386 static int vxlan_fdb_get(struct sk_buff *skb, 1387 struct nlattr *tb[], 1388 struct net_device *dev, 1389 const unsigned char *addr, 1390 u16 vid, u32 portid, u32 seq, 1391 struct netlink_ext_ack *extack) 1392 { 1393 struct vxlan_dev *vxlan = netdev_priv(dev); 1394 struct vxlan_fdb *f; 1395 __be32 vni; 1396 int err; 1397 1398 if (tb[NDA_VNI]) 1399 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1400 else 1401 vni = vxlan->default_dst.remote_vni; 1402 1403 rcu_read_lock(); 1404 1405 f = vxlan_find_mac_rcu(vxlan, addr, vni); 1406 if (!f) { 1407 NL_SET_ERR_MSG(extack, "Fdb entry not found"); 1408 err = -ENOENT; 1409 goto errout; 1410 } 1411 1412 err = vxlan_fdb_info(skb, vxlan, f, portid, seq, 1413 RTM_NEWNEIGH, 0, first_remote_rcu(f)); 1414 errout: 1415 rcu_read_unlock(); 1416 return err; 1417 } 1418 1419 /* Watch incoming packets to learn mapping between Ethernet address 1420 * and Tunnel endpoint. 1421 */ 1422 static enum skb_drop_reason vxlan_snoop(struct net_device *dev, 1423 union vxlan_addr *src_ip, 1424 const u8 *src_mac, u32 src_ifindex, 1425 __be32 vni) 1426 { 1427 struct vxlan_dev *vxlan = netdev_priv(dev); 1428 struct vxlan_fdb *f; 1429 u32 ifindex = 0; 1430 1431 /* Ignore packets from invalid src-address */ 1432 if (!is_valid_ether_addr(src_mac)) 1433 return SKB_DROP_REASON_MAC_INVALID_SOURCE; 1434 1435 #if IS_ENABLED(CONFIG_IPV6) 1436 if (src_ip->sa.sa_family == AF_INET6 && 1437 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)) 1438 ifindex = src_ifindex; 1439 #endif 1440 1441 f = vxlan_find_mac_rcu(vxlan, src_mac, vni); 1442 if (likely(f)) { 1443 struct vxlan_rdst *rdst = first_remote_rcu(f); 1444 unsigned long now = jiffies; 1445 1446 if (READ_ONCE(f->updated) != now) 1447 WRITE_ONCE(f->updated, now); 1448 1449 /* Don't override an fdb with nexthop with a learnt entry */ 1450 if (rcu_access_pointer(f->nh)) 1451 return SKB_DROP_REASON_VXLAN_ENTRY_EXISTS; 1452 1453 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) && 1454 rdst->remote_ifindex == ifindex)) 1455 return SKB_NOT_DROPPED_YET; 1456 1457 /* Don't migrate static entries, drop packets */ 1458 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 1459 return SKB_DROP_REASON_VXLAN_ENTRY_EXISTS; 1460 1461 if (net_ratelimit()) 1462 netdev_info(dev, 1463 "%pM migrated from %pIS to %pIS\n", 1464 src_mac, &rdst->remote_ip.sa, &src_ip->sa); 1465 1466 rdst->remote_ip = *src_ip; 1467 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL); 1468 } else { 1469 /* learned new entry */ 1470 spin_lock(&vxlan->hash_lock); 1471 1472 /* close off race between vxlan_flush and incoming packets */ 1473 if (netif_running(dev)) 1474 vxlan_fdb_update(vxlan, src_mac, src_ip, 1475 NUD_REACHABLE, 1476 NLM_F_EXCL|NLM_F_CREATE, 1477 vxlan->cfg.dst_port, 1478 vni, 1479 vxlan->default_dst.remote_vni, 1480 ifindex, NTF_SELF, 0, true, NULL); 1481 spin_unlock(&vxlan->hash_lock); 1482 } 1483 1484 return SKB_NOT_DROPPED_YET; 1485 } 1486 1487 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs) 1488 { 1489 ASSERT_RTNL(); 1490 1491 if (!vs) 1492 return false; 1493 if (!refcount_dec_and_test(&vs->refcnt)) 1494 return false; 1495 1496 hlist_del_rcu(&vs->hlist); 1497 udp_tunnel_notify_del_rx_port(vs->sock, 1498 (vs->flags & VXLAN_F_GPE) ? 1499 UDP_TUNNEL_TYPE_VXLAN_GPE : 1500 UDP_TUNNEL_TYPE_VXLAN); 1501 1502 return true; 1503 } 1504 1505 static void vxlan_sock_release(struct vxlan_dev *vxlan) 1506 { 1507 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); 1508 #if IS_ENABLED(CONFIG_IPV6) 1509 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); 1510 1511 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 1512 #endif 1513 1514 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 1515 synchronize_net(); 1516 1517 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 1518 vxlan_vs_del_vnigrp(vxlan); 1519 else 1520 vxlan_vs_del_dev(vxlan); 1521 1522 if (__vxlan_sock_release_prep(sock4)) { 1523 udp_tunnel_sock_release(sock4->sock); 1524 kfree(sock4); 1525 } 1526 1527 #if IS_ENABLED(CONFIG_IPV6) 1528 if (__vxlan_sock_release_prep(sock6)) { 1529 udp_tunnel_sock_release(sock6->sock); 1530 kfree(sock6); 1531 } 1532 #endif 1533 } 1534 1535 static enum skb_drop_reason vxlan_remcsum(struct sk_buff *skb, u32 vxflags) 1536 { 1537 const struct vxlanhdr *vh = vxlan_hdr(skb); 1538 enum skb_drop_reason reason; 1539 size_t start, offset; 1540 1541 if (!(vh->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload) 1542 return SKB_NOT_DROPPED_YET; 1543 1544 start = vxlan_rco_start(vh->vx_vni); 1545 offset = start + vxlan_rco_offset(vh->vx_vni); 1546 1547 reason = pskb_may_pull_reason(skb, offset + sizeof(u16)); 1548 if (reason) 1549 return reason; 1550 1551 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset, 1552 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL)); 1553 return SKB_NOT_DROPPED_YET; 1554 } 1555 1556 static void vxlan_parse_gbp_hdr(struct sk_buff *skb, u32 vxflags, 1557 struct vxlan_metadata *md) 1558 { 1559 const struct vxlanhdr *vh = vxlan_hdr(skb); 1560 const struct vxlanhdr_gbp *gbp; 1561 struct metadata_dst *tun_dst; 1562 1563 gbp = (const struct vxlanhdr_gbp *)vh; 1564 1565 if (!(vh->vx_flags & VXLAN_HF_GBP)) 1566 return; 1567 1568 md->gbp = ntohs(gbp->policy_id); 1569 1570 tun_dst = (struct metadata_dst *)skb_dst(skb); 1571 if (tun_dst) { 1572 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, 1573 tun_dst->u.tun_info.key.tun_flags); 1574 tun_dst->u.tun_info.options_len = sizeof(*md); 1575 } 1576 if (gbp->dont_learn) 1577 md->gbp |= VXLAN_GBP_DONT_LEARN; 1578 1579 if (gbp->policy_applied) 1580 md->gbp |= VXLAN_GBP_POLICY_APPLIED; 1581 1582 /* In flow-based mode, GBP is carried in dst_metadata */ 1583 if (!(vxflags & VXLAN_F_COLLECT_METADATA)) 1584 skb->mark = md->gbp; 1585 } 1586 1587 static enum skb_drop_reason vxlan_set_mac(struct vxlan_dev *vxlan, 1588 struct vxlan_sock *vs, 1589 struct sk_buff *skb, __be32 vni) 1590 { 1591 union vxlan_addr saddr; 1592 u32 ifindex = skb->dev->ifindex; 1593 1594 skb_reset_mac_header(skb); 1595 skb->protocol = eth_type_trans(skb, vxlan->dev); 1596 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 1597 1598 /* Ignore packet loops (and multicast echo) */ 1599 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr)) 1600 return SKB_DROP_REASON_LOCAL_MAC; 1601 1602 /* Get address from the outer IP header */ 1603 if (vxlan_get_sk_family(vs) == AF_INET) { 1604 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; 1605 saddr.sa.sa_family = AF_INET; 1606 #if IS_ENABLED(CONFIG_IPV6) 1607 } else { 1608 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr; 1609 saddr.sa.sa_family = AF_INET6; 1610 #endif 1611 } 1612 1613 if (!(vxlan->cfg.flags & VXLAN_F_LEARN)) 1614 return SKB_NOT_DROPPED_YET; 1615 1616 return vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, 1617 ifindex, vni); 1618 } 1619 1620 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph, 1621 struct sk_buff *skb) 1622 { 1623 int err = 0; 1624 1625 if (vxlan_get_sk_family(vs) == AF_INET) 1626 err = IP_ECN_decapsulate(oiph, skb); 1627 #if IS_ENABLED(CONFIG_IPV6) 1628 else 1629 err = IP6_ECN_decapsulate(oiph, skb); 1630 #endif 1631 1632 if (unlikely(err) && log_ecn_error) { 1633 if (vxlan_get_sk_family(vs) == AF_INET) 1634 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 1635 &((struct iphdr *)oiph)->saddr, 1636 ((struct iphdr *)oiph)->tos); 1637 else 1638 net_info_ratelimited("non-ECT from %pI6\n", 1639 &((struct ipv6hdr *)oiph)->saddr); 1640 } 1641 return err <= 1; 1642 } 1643 1644 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb) 1645 { 1646 struct vxlan_vni_node *vninode = NULL; 1647 const struct vxlanhdr *vh; 1648 struct vxlan_dev *vxlan; 1649 struct vxlan_sock *vs; 1650 struct vxlan_metadata _md; 1651 struct vxlan_metadata *md = &_md; 1652 __be16 protocol = htons(ETH_P_TEB); 1653 enum skb_drop_reason reason; 1654 bool raw_proto = false; 1655 void *oiph; 1656 __be32 vni = 0; 1657 int nh; 1658 1659 /* Need UDP and VXLAN header to be present */ 1660 reason = pskb_may_pull_reason(skb, VXLAN_HLEN); 1661 if (reason) 1662 goto drop; 1663 1664 vh = vxlan_hdr(skb); 1665 /* VNI flag always required to be set */ 1666 if (!(vh->vx_flags & VXLAN_HF_VNI)) { 1667 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", 1668 ntohl(vh->vx_flags), ntohl(vh->vx_vni)); 1669 reason = SKB_DROP_REASON_VXLAN_INVALID_HDR; 1670 /* Return non vxlan pkt */ 1671 goto drop; 1672 } 1673 1674 vs = rcu_dereference_sk_user_data(sk); 1675 if (!vs) 1676 goto drop; 1677 1678 vni = vxlan_vni(vh->vx_vni); 1679 1680 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode); 1681 if (!vxlan) { 1682 reason = SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND; 1683 goto drop; 1684 } 1685 1686 if (vh->vx_flags & vxlan->cfg.reserved_bits.vx_flags || 1687 vh->vx_vni & vxlan->cfg.reserved_bits.vx_vni) { 1688 /* If the header uses bits besides those enabled by the 1689 * netdevice configuration, treat this as a malformed packet. 1690 * This behavior diverges from VXLAN RFC (RFC7348) which 1691 * stipulates that bits in reserved in reserved fields are to be 1692 * ignored. The approach here maintains compatibility with 1693 * previous stack code, and also is more robust and provides a 1694 * little more security in adding extensions to VXLAN. 1695 */ 1696 reason = SKB_DROP_REASON_VXLAN_INVALID_HDR; 1697 DEV_STATS_INC(vxlan->dev, rx_frame_errors); 1698 DEV_STATS_INC(vxlan->dev, rx_errors); 1699 vxlan_vnifilter_count(vxlan, vni, vninode, 1700 VXLAN_VNI_STATS_RX_ERRORS, 0); 1701 goto drop; 1702 } 1703 1704 if (vxlan->cfg.flags & VXLAN_F_GPE) { 1705 if (!vxlan_parse_gpe_proto(vh, &protocol)) 1706 goto drop; 1707 raw_proto = true; 1708 } 1709 1710 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto, 1711 !net_eq(vxlan->net, dev_net(vxlan->dev)))) { 1712 reason = SKB_DROP_REASON_NOMEM; 1713 goto drop; 1714 } 1715 1716 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_RX) { 1717 reason = vxlan_remcsum(skb, vxlan->cfg.flags); 1718 if (unlikely(reason)) 1719 goto drop; 1720 } 1721 1722 if (vxlan_collect_metadata(vs)) { 1723 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 1724 struct metadata_dst *tun_dst; 1725 1726 __set_bit(IP_TUNNEL_KEY_BIT, flags); 1727 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), flags, 1728 key32_to_tunnel_id(vni), sizeof(*md)); 1729 1730 if (!tun_dst) { 1731 reason = SKB_DROP_REASON_NOMEM; 1732 goto drop; 1733 } 1734 1735 md = ip_tunnel_info_opts(&tun_dst->u.tun_info); 1736 1737 skb_dst_set(skb, (struct dst_entry *)tun_dst); 1738 } else { 1739 memset(md, 0, sizeof(*md)); 1740 } 1741 1742 if (vxlan->cfg.flags & VXLAN_F_GBP) 1743 vxlan_parse_gbp_hdr(skb, vxlan->cfg.flags, md); 1744 /* Note that GBP and GPE can never be active together. This is 1745 * ensured in vxlan_dev_configure. 1746 */ 1747 1748 if (!raw_proto) { 1749 reason = vxlan_set_mac(vxlan, vs, skb, vni); 1750 if (reason) 1751 goto drop; 1752 } else { 1753 skb_reset_mac_header(skb); 1754 skb->dev = vxlan->dev; 1755 skb->pkt_type = PACKET_HOST; 1756 } 1757 1758 /* Save offset of outer header relative to skb->head, 1759 * because we are going to reset the network header to the inner header 1760 * and might change skb->head. 1761 */ 1762 nh = skb_network_header(skb) - skb->head; 1763 1764 skb_reset_network_header(skb); 1765 1766 reason = pskb_inet_may_pull_reason(skb); 1767 if (reason) { 1768 DEV_STATS_INC(vxlan->dev, rx_length_errors); 1769 DEV_STATS_INC(vxlan->dev, rx_errors); 1770 vxlan_vnifilter_count(vxlan, vni, vninode, 1771 VXLAN_VNI_STATS_RX_ERRORS, 0); 1772 goto drop; 1773 } 1774 1775 /* Get the outer header. */ 1776 oiph = skb->head + nh; 1777 1778 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) { 1779 reason = SKB_DROP_REASON_IP_TUNNEL_ECN; 1780 DEV_STATS_INC(vxlan->dev, rx_frame_errors); 1781 DEV_STATS_INC(vxlan->dev, rx_errors); 1782 vxlan_vnifilter_count(vxlan, vni, vninode, 1783 VXLAN_VNI_STATS_RX_ERRORS, 0); 1784 goto drop; 1785 } 1786 1787 rcu_read_lock(); 1788 1789 if (unlikely(!(vxlan->dev->flags & IFF_UP))) { 1790 rcu_read_unlock(); 1791 dev_dstats_rx_dropped(vxlan->dev); 1792 vxlan_vnifilter_count(vxlan, vni, vninode, 1793 VXLAN_VNI_STATS_RX_DROPS, 0); 1794 reason = SKB_DROP_REASON_DEV_READY; 1795 goto drop; 1796 } 1797 1798 dev_dstats_rx_add(vxlan->dev, skb->len); 1799 vxlan_vnifilter_count(vxlan, vni, vninode, VXLAN_VNI_STATS_RX, skb->len); 1800 gro_cells_receive(&vxlan->gro_cells, skb); 1801 1802 rcu_read_unlock(); 1803 1804 return 0; 1805 1806 drop: 1807 reason = reason ?: SKB_DROP_REASON_NOT_SPECIFIED; 1808 /* Consume bad packet */ 1809 kfree_skb_reason(skb, reason); 1810 return 0; 1811 } 1812 1813 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb) 1814 { 1815 struct vxlan_dev *vxlan; 1816 struct vxlan_sock *vs; 1817 struct vxlanhdr *hdr; 1818 __be32 vni; 1819 1820 if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN)) 1821 return -EINVAL; 1822 1823 hdr = vxlan_hdr(skb); 1824 1825 if (!(hdr->vx_flags & VXLAN_HF_VNI)) 1826 return -EINVAL; 1827 1828 vs = rcu_dereference_sk_user_data(sk); 1829 if (!vs) 1830 return -ENOENT; 1831 1832 vni = vxlan_vni(hdr->vx_vni); 1833 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, NULL); 1834 if (!vxlan) 1835 return -ENOENT; 1836 1837 return 0; 1838 } 1839 1840 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 1841 { 1842 struct vxlan_dev *vxlan = netdev_priv(dev); 1843 struct arphdr *parp; 1844 u8 *arpptr, *sha; 1845 __be32 sip, tip; 1846 struct neighbour *n; 1847 1848 if (dev->flags & IFF_NOARP) 1849 goto out; 1850 1851 if (!pskb_may_pull(skb, arp_hdr_len(dev))) { 1852 dev_dstats_tx_dropped(dev); 1853 vxlan_vnifilter_count(vxlan, vni, NULL, 1854 VXLAN_VNI_STATS_TX_DROPS, 0); 1855 goto out; 1856 } 1857 parp = arp_hdr(skb); 1858 1859 if ((parp->ar_hrd != htons(ARPHRD_ETHER) && 1860 parp->ar_hrd != htons(ARPHRD_IEEE802)) || 1861 parp->ar_pro != htons(ETH_P_IP) || 1862 parp->ar_op != htons(ARPOP_REQUEST) || 1863 parp->ar_hln != dev->addr_len || 1864 parp->ar_pln != 4) 1865 goto out; 1866 arpptr = (u8 *)parp + sizeof(struct arphdr); 1867 sha = arpptr; 1868 arpptr += dev->addr_len; /* sha */ 1869 memcpy(&sip, arpptr, sizeof(sip)); 1870 arpptr += sizeof(sip); 1871 arpptr += dev->addr_len; /* tha */ 1872 memcpy(&tip, arpptr, sizeof(tip)); 1873 1874 if (ipv4_is_loopback(tip) || 1875 ipv4_is_multicast(tip)) 1876 goto out; 1877 1878 n = neigh_lookup(&arp_tbl, &tip, dev); 1879 1880 if (n) { 1881 struct vxlan_rdst *rdst = NULL; 1882 struct vxlan_fdb *f; 1883 struct sk_buff *reply; 1884 1885 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) { 1886 neigh_release(n); 1887 goto out; 1888 } 1889 1890 rcu_read_lock(); 1891 f = vxlan_find_mac_tx(vxlan, n->ha, vni); 1892 if (f) 1893 rdst = first_remote_rcu(f); 1894 if (rdst && vxlan_addr_any(&rdst->remote_ip)) { 1895 /* bridge-local neighbor */ 1896 neigh_release(n); 1897 rcu_read_unlock(); 1898 goto out; 1899 } 1900 rcu_read_unlock(); 1901 1902 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, 1903 n->ha, sha); 1904 1905 neigh_release(n); 1906 1907 if (reply == NULL) 1908 goto out; 1909 1910 skb_reset_mac_header(reply); 1911 __skb_pull(reply, skb_network_offset(reply)); 1912 reply->ip_summed = CHECKSUM_UNNECESSARY; 1913 reply->pkt_type = PACKET_HOST; 1914 1915 if (netif_rx(reply) == NET_RX_DROP) { 1916 dev_dstats_rx_dropped(dev); 1917 vxlan_vnifilter_count(vxlan, vni, NULL, 1918 VXLAN_VNI_STATS_RX_DROPS, 0); 1919 } 1920 1921 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 1922 union vxlan_addr ipa = { 1923 .sin.sin_addr.s_addr = tip, 1924 .sin.sin_family = AF_INET, 1925 }; 1926 1927 vxlan_ip_miss(dev, &ipa); 1928 } 1929 out: 1930 consume_skb(skb); 1931 return NETDEV_TX_OK; 1932 } 1933 1934 #if IS_ENABLED(CONFIG_IPV6) 1935 static struct sk_buff *vxlan_na_create(struct sk_buff *request, 1936 struct neighbour *n, bool isrouter) 1937 { 1938 struct net_device *dev = request->dev; 1939 struct sk_buff *reply; 1940 struct nd_msg *ns, *na; 1941 struct ipv6hdr *pip6; 1942 u8 *daddr; 1943 int na_olen = 8; /* opt hdr + ETH_ALEN for target */ 1944 int ns_olen; 1945 int i, len; 1946 1947 if (dev == NULL || !pskb_may_pull(request, request->len)) 1948 return NULL; 1949 1950 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) + 1951 sizeof(*na) + na_olen + dev->needed_tailroom; 1952 reply = alloc_skb(len, GFP_ATOMIC); 1953 if (reply == NULL) 1954 return NULL; 1955 1956 reply->protocol = htons(ETH_P_IPV6); 1957 reply->dev = dev; 1958 skb_reserve(reply, LL_RESERVED_SPACE(request->dev)); 1959 skb_push(reply, sizeof(struct ethhdr)); 1960 skb_reset_mac_header(reply); 1961 1962 ns = (struct nd_msg *)(ipv6_hdr(request) + 1); 1963 1964 daddr = eth_hdr(request)->h_source; 1965 ns_olen = request->len - skb_network_offset(request) - 1966 sizeof(struct ipv6hdr) - sizeof(*ns); 1967 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) { 1968 if (!ns->opt[i + 1]) { 1969 kfree_skb(reply); 1970 return NULL; 1971 } 1972 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) { 1973 daddr = ns->opt + i + sizeof(struct nd_opt_hdr); 1974 break; 1975 } 1976 } 1977 1978 /* Ethernet header */ 1979 ether_addr_copy(eth_hdr(reply)->h_dest, daddr); 1980 ether_addr_copy(eth_hdr(reply)->h_source, n->ha); 1981 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6); 1982 reply->protocol = htons(ETH_P_IPV6); 1983 1984 skb_pull(reply, sizeof(struct ethhdr)); 1985 skb_reset_network_header(reply); 1986 skb_put(reply, sizeof(struct ipv6hdr)); 1987 1988 /* IPv6 header */ 1989 1990 pip6 = ipv6_hdr(reply); 1991 memset(pip6, 0, sizeof(struct ipv6hdr)); 1992 pip6->version = 6; 1993 pip6->priority = ipv6_hdr(request)->priority; 1994 pip6->nexthdr = IPPROTO_ICMPV6; 1995 pip6->hop_limit = 255; 1996 pip6->daddr = ipv6_hdr(request)->saddr; 1997 pip6->saddr = *(struct in6_addr *)n->primary_key; 1998 1999 skb_pull(reply, sizeof(struct ipv6hdr)); 2000 skb_reset_transport_header(reply); 2001 2002 /* Neighbor Advertisement */ 2003 na = skb_put_zero(reply, sizeof(*na) + na_olen); 2004 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; 2005 na->icmph.icmp6_router = isrouter; 2006 na->icmph.icmp6_override = 1; 2007 na->icmph.icmp6_solicited = 1; 2008 na->target = ns->target; 2009 ether_addr_copy(&na->opt[2], n->ha); 2010 na->opt[0] = ND_OPT_TARGET_LL_ADDR; 2011 na->opt[1] = na_olen >> 3; 2012 2013 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr, 2014 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6, 2015 csum_partial(na, sizeof(*na)+na_olen, 0)); 2016 2017 pip6->payload_len = htons(sizeof(*na)+na_olen); 2018 2019 skb_push(reply, sizeof(struct ipv6hdr)); 2020 2021 reply->ip_summed = CHECKSUM_UNNECESSARY; 2022 2023 return reply; 2024 } 2025 2026 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 2027 { 2028 struct vxlan_dev *vxlan = netdev_priv(dev); 2029 const struct in6_addr *daddr; 2030 const struct ipv6hdr *iphdr; 2031 struct inet6_dev *in6_dev; 2032 struct neighbour *n; 2033 struct nd_msg *msg; 2034 2035 rcu_read_lock(); 2036 in6_dev = __in6_dev_get(dev); 2037 if (!in6_dev) 2038 goto out; 2039 2040 iphdr = ipv6_hdr(skb); 2041 daddr = &iphdr->daddr; 2042 msg = (struct nd_msg *)(iphdr + 1); 2043 2044 if (ipv6_addr_loopback(daddr) || 2045 ipv6_addr_is_multicast(&msg->target)) 2046 goto out; 2047 2048 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev); 2049 2050 if (n) { 2051 struct vxlan_rdst *rdst = NULL; 2052 struct vxlan_fdb *f; 2053 struct sk_buff *reply; 2054 2055 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) { 2056 neigh_release(n); 2057 goto out; 2058 } 2059 2060 f = vxlan_find_mac_tx(vxlan, n->ha, vni); 2061 if (f) 2062 rdst = first_remote_rcu(f); 2063 if (rdst && vxlan_addr_any(&rdst->remote_ip)) { 2064 /* bridge-local neighbor */ 2065 neigh_release(n); 2066 goto out; 2067 } 2068 2069 reply = vxlan_na_create(skb, n, 2070 !!(f ? f->flags & NTF_ROUTER : 0)); 2071 2072 neigh_release(n); 2073 2074 if (reply == NULL) 2075 goto out; 2076 2077 if (netif_rx(reply) == NET_RX_DROP) { 2078 dev_dstats_rx_dropped(dev); 2079 vxlan_vnifilter_count(vxlan, vni, NULL, 2080 VXLAN_VNI_STATS_RX_DROPS, 0); 2081 } 2082 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 2083 union vxlan_addr ipa = { 2084 .sin6.sin6_addr = msg->target, 2085 .sin6.sin6_family = AF_INET6, 2086 }; 2087 2088 vxlan_ip_miss(dev, &ipa); 2089 } 2090 2091 out: 2092 rcu_read_unlock(); 2093 consume_skb(skb); 2094 return NETDEV_TX_OK; 2095 } 2096 #endif 2097 2098 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) 2099 { 2100 struct vxlan_dev *vxlan = netdev_priv(dev); 2101 struct neighbour *n; 2102 2103 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) 2104 return false; 2105 2106 n = NULL; 2107 switch (ntohs(eth_hdr(skb)->h_proto)) { 2108 case ETH_P_IP: 2109 { 2110 struct iphdr *pip; 2111 2112 if (!pskb_may_pull(skb, sizeof(struct iphdr))) 2113 return false; 2114 pip = ip_hdr(skb); 2115 n = neigh_lookup(&arp_tbl, &pip->daddr, dev); 2116 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2117 union vxlan_addr ipa = { 2118 .sin.sin_addr.s_addr = pip->daddr, 2119 .sin.sin_family = AF_INET, 2120 }; 2121 2122 vxlan_ip_miss(dev, &ipa); 2123 return false; 2124 } 2125 2126 break; 2127 } 2128 #if IS_ENABLED(CONFIG_IPV6) 2129 case ETH_P_IPV6: 2130 { 2131 struct ipv6hdr *pip6; 2132 2133 /* check if nd_tbl is not initiliazed due to 2134 * ipv6.disable=1 set during boot 2135 */ 2136 if (!ipv6_stub->nd_tbl) 2137 return false; 2138 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 2139 return false; 2140 pip6 = ipv6_hdr(skb); 2141 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev); 2142 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2143 union vxlan_addr ipa = { 2144 .sin6.sin6_addr = pip6->daddr, 2145 .sin6.sin6_family = AF_INET6, 2146 }; 2147 2148 vxlan_ip_miss(dev, &ipa); 2149 return false; 2150 } 2151 2152 break; 2153 } 2154 #endif 2155 default: 2156 return false; 2157 } 2158 2159 if (n) { 2160 bool diff; 2161 2162 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha); 2163 if (diff) { 2164 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, 2165 dev->addr_len); 2166 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); 2167 } 2168 neigh_release(n); 2169 return diff; 2170 } 2171 2172 return false; 2173 } 2174 2175 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, __be16 protocol) 2176 { 2177 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh; 2178 2179 gpe->np_applied = 1; 2180 gpe->next_protocol = tun_p_from_eth_p(protocol); 2181 if (!gpe->next_protocol) 2182 return -EPFNOSUPPORT; 2183 return 0; 2184 } 2185 2186 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst, 2187 int iphdr_len, __be32 vni, 2188 struct vxlan_metadata *md, u32 vxflags, 2189 bool udp_sum) 2190 { 2191 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 2192 __be16 inner_protocol = htons(ETH_P_TEB); 2193 struct vxlanhdr *vxh; 2194 bool double_encap; 2195 int min_headroom; 2196 int err; 2197 2198 if ((vxflags & VXLAN_F_REMCSUM_TX) && 2199 skb->ip_summed == CHECKSUM_PARTIAL) { 2200 int csum_start = skb_checksum_start_offset(skb); 2201 2202 if (csum_start <= VXLAN_MAX_REMCSUM_START && 2203 !(csum_start & VXLAN_RCO_SHIFT_MASK) && 2204 (skb->csum_offset == offsetof(struct udphdr, check) || 2205 skb->csum_offset == offsetof(struct tcphdr, check))) 2206 type |= SKB_GSO_TUNNEL_REMCSUM; 2207 } 2208 2209 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len 2210 + VXLAN_HLEN + iphdr_len; 2211 2212 /* Need space for new headers (invalidates iph ptr) */ 2213 err = skb_cow_head(skb, min_headroom); 2214 if (unlikely(err)) 2215 return err; 2216 2217 double_encap = udp_tunnel_handle_partial(skb); 2218 err = iptunnel_handle_offloads(skb, type); 2219 if (err) 2220 return err; 2221 2222 vxh = __skb_push(skb, sizeof(*vxh)); 2223 vxh->vx_flags = VXLAN_HF_VNI; 2224 vxh->vx_vni = vxlan_vni_field(vni); 2225 2226 if (type & SKB_GSO_TUNNEL_REMCSUM) { 2227 unsigned int start; 2228 2229 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr); 2230 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset); 2231 vxh->vx_flags |= VXLAN_HF_RCO; 2232 2233 if (!skb_is_gso(skb)) { 2234 skb->ip_summed = CHECKSUM_NONE; 2235 skb->encapsulation = 0; 2236 } 2237 } 2238 2239 if (vxflags & VXLAN_F_GBP) 2240 vxlan_build_gbp_hdr(vxh, md); 2241 if (vxflags & VXLAN_F_GPE) { 2242 err = vxlan_build_gpe_hdr(vxh, skb->protocol); 2243 if (err < 0) 2244 return err; 2245 inner_protocol = skb->protocol; 2246 } 2247 2248 udp_tunnel_set_inner_protocol(skb, double_encap, inner_protocol); 2249 return 0; 2250 } 2251 2252 /* Bypass encapsulation if the destination is local */ 2253 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, 2254 struct vxlan_dev *dst_vxlan, __be32 vni, 2255 bool snoop) 2256 { 2257 union vxlan_addr loopback; 2258 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip; 2259 unsigned int len = skb->len; 2260 struct net_device *dev; 2261 2262 skb->pkt_type = PACKET_HOST; 2263 skb->encapsulation = 0; 2264 skb->dev = dst_vxlan->dev; 2265 __skb_pull(skb, skb_network_offset(skb)); 2266 2267 if (remote_ip->sa.sa_family == AF_INET) { 2268 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 2269 loopback.sa.sa_family = AF_INET; 2270 #if IS_ENABLED(CONFIG_IPV6) 2271 } else { 2272 loopback.sin6.sin6_addr = in6addr_loopback; 2273 loopback.sa.sa_family = AF_INET6; 2274 #endif 2275 } 2276 2277 rcu_read_lock(); 2278 dev = skb->dev; 2279 if (unlikely(!(dev->flags & IFF_UP))) { 2280 kfree_skb_reason(skb, SKB_DROP_REASON_DEV_READY); 2281 goto drop; 2282 } 2283 2284 if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop) 2285 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni); 2286 2287 dev_dstats_tx_add(src_vxlan->dev, len); 2288 vxlan_vnifilter_count(src_vxlan, vni, NULL, VXLAN_VNI_STATS_TX, len); 2289 2290 if (__netif_rx(skb) == NET_RX_SUCCESS) { 2291 dev_dstats_rx_add(dst_vxlan->dev, len); 2292 vxlan_vnifilter_count(dst_vxlan, vni, NULL, VXLAN_VNI_STATS_RX, 2293 len); 2294 } else { 2295 drop: 2296 dev_dstats_rx_dropped(dev); 2297 vxlan_vnifilter_count(dst_vxlan, vni, NULL, 2298 VXLAN_VNI_STATS_RX_DROPS, 0); 2299 } 2300 rcu_read_unlock(); 2301 } 2302 2303 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev, 2304 struct vxlan_dev *vxlan, 2305 int addr_family, 2306 __be16 dst_port, int dst_ifindex, __be32 vni, 2307 struct dst_entry *dst, 2308 u32 rt_flags) 2309 { 2310 #if IS_ENABLED(CONFIG_IPV6) 2311 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of 2312 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple 2313 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry. 2314 */ 2315 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL); 2316 #endif 2317 /* Bypass encapsulation if the destination is local */ 2318 if (rt_flags & RTCF_LOCAL && 2319 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && 2320 vxlan->cfg.flags & VXLAN_F_LOCALBYPASS) { 2321 struct vxlan_dev *dst_vxlan; 2322 2323 dst_release(dst); 2324 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni, 2325 addr_family, dst_port, 2326 vxlan->cfg.flags); 2327 if (!dst_vxlan) { 2328 DEV_STATS_INC(dev, tx_errors); 2329 vxlan_vnifilter_count(vxlan, vni, NULL, 2330 VXLAN_VNI_STATS_TX_ERRORS, 0); 2331 kfree_skb_reason(skb, SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND); 2332 2333 return -ENOENT; 2334 } 2335 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true); 2336 return 1; 2337 } 2338 2339 return 0; 2340 } 2341 2342 void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 2343 __be32 default_vni, struct vxlan_rdst *rdst, bool did_rsc) 2344 { 2345 struct dst_cache *dst_cache; 2346 struct ip_tunnel_info *info; 2347 struct ip_tunnel_key *pkey; 2348 struct ip_tunnel_key key; 2349 struct vxlan_dev *vxlan = netdev_priv(dev); 2350 const struct iphdr *old_iph; 2351 struct vxlan_metadata _md; 2352 struct vxlan_metadata *md = &_md; 2353 unsigned int pkt_len = skb->len; 2354 __be16 src_port = 0, dst_port; 2355 struct dst_entry *ndst = NULL; 2356 int addr_family; 2357 __u8 tos, ttl; 2358 int ifindex; 2359 int err = 0; 2360 u32 flags = vxlan->cfg.flags; 2361 bool use_cache; 2362 bool udp_sum = false; 2363 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev)); 2364 enum skb_drop_reason reason; 2365 bool no_eth_encap; 2366 __be32 vni = 0; 2367 2368 no_eth_encap = flags & VXLAN_F_GPE && skb->protocol != htons(ETH_P_TEB); 2369 reason = skb_vlan_inet_prepare(skb, no_eth_encap); 2370 if (reason) 2371 goto drop; 2372 2373 reason = SKB_DROP_REASON_NOT_SPECIFIED; 2374 old_iph = ip_hdr(skb); 2375 2376 info = skb_tunnel_info(skb); 2377 use_cache = ip_tunnel_dst_cache_usable(skb, info); 2378 2379 if (rdst) { 2380 memset(&key, 0, sizeof(key)); 2381 pkey = &key; 2382 2383 if (vxlan_addr_any(&rdst->remote_ip)) { 2384 if (did_rsc) { 2385 /* short-circuited back to local bridge */ 2386 vxlan_encap_bypass(skb, vxlan, vxlan, 2387 default_vni, true); 2388 return; 2389 } 2390 goto drop; 2391 } 2392 2393 addr_family = vxlan->cfg.saddr.sa.sa_family; 2394 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port; 2395 vni = (rdst->remote_vni) ? : default_vni; 2396 ifindex = rdst->remote_ifindex; 2397 2398 if (addr_family == AF_INET) { 2399 key.u.ipv4.src = vxlan->cfg.saddr.sin.sin_addr.s_addr; 2400 key.u.ipv4.dst = rdst->remote_ip.sin.sin_addr.s_addr; 2401 } else { 2402 key.u.ipv6.src = vxlan->cfg.saddr.sin6.sin6_addr; 2403 key.u.ipv6.dst = rdst->remote_ip.sin6.sin6_addr; 2404 } 2405 2406 dst_cache = &rdst->dst_cache; 2407 md->gbp = skb->mark; 2408 if (flags & VXLAN_F_TTL_INHERIT) { 2409 ttl = ip_tunnel_get_ttl(old_iph, skb); 2410 } else { 2411 ttl = vxlan->cfg.ttl; 2412 if (!ttl && vxlan_addr_multicast(&rdst->remote_ip)) 2413 ttl = 1; 2414 } 2415 tos = vxlan->cfg.tos; 2416 if (tos == 1) 2417 tos = ip_tunnel_get_dsfield(old_iph, skb); 2418 if (tos && !info) 2419 use_cache = false; 2420 2421 if (addr_family == AF_INET) 2422 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX); 2423 else 2424 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX); 2425 #if IS_ENABLED(CONFIG_IPV6) 2426 switch (vxlan->cfg.label_policy) { 2427 case VXLAN_LABEL_FIXED: 2428 key.label = vxlan->cfg.label; 2429 break; 2430 case VXLAN_LABEL_INHERIT: 2431 key.label = ip_tunnel_get_flowlabel(old_iph, skb); 2432 break; 2433 default: 2434 DEBUG_NET_WARN_ON_ONCE(1); 2435 goto drop; 2436 } 2437 #endif 2438 } else { 2439 if (!info) { 2440 WARN_ONCE(1, "%s: Missing encapsulation instructions\n", 2441 dev->name); 2442 goto drop; 2443 } 2444 pkey = &info->key; 2445 addr_family = ip_tunnel_info_af(info); 2446 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port; 2447 vni = tunnel_id_to_key32(info->key.tun_id); 2448 ifindex = 0; 2449 dst_cache = &info->dst_cache; 2450 if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags)) { 2451 if (info->options_len < sizeof(*md)) 2452 goto drop; 2453 md = ip_tunnel_info_opts(info); 2454 } 2455 ttl = info->key.ttl; 2456 tos = info->key.tos; 2457 udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 2458 } 2459 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 2460 vxlan->cfg.port_max, true); 2461 2462 rcu_read_lock(); 2463 if (addr_family == AF_INET) { 2464 struct vxlan_sock *sock4; 2465 u16 ipcb_flags = 0; 2466 struct rtable *rt; 2467 __be16 df = 0; 2468 __be32 saddr; 2469 2470 sock4 = rcu_dereference(vxlan->vn4_sock); 2471 if (unlikely(!sock4)) { 2472 reason = SKB_DROP_REASON_DEV_READY; 2473 goto tx_error; 2474 } 2475 2476 if (!ifindex) 2477 ifindex = sock4->sock->sk->sk_bound_dev_if; 2478 2479 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, ifindex, 2480 &saddr, pkey, src_port, dst_port, 2481 tos, use_cache ? dst_cache : NULL); 2482 if (IS_ERR(rt)) { 2483 err = PTR_ERR(rt); 2484 reason = SKB_DROP_REASON_IP_OUTNOROUTES; 2485 goto tx_error; 2486 } 2487 2488 if (flags & VXLAN_F_MC_ROUTE) 2489 ipcb_flags |= IPSKB_MCROUTE; 2490 2491 if (!info) { 2492 /* Bypass encapsulation if the destination is local */ 2493 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET, 2494 dst_port, ifindex, vni, 2495 &rt->dst, rt->rt_flags); 2496 if (err) 2497 goto out_unlock; 2498 2499 if (vxlan->cfg.df == VXLAN_DF_SET) { 2500 df = htons(IP_DF); 2501 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) { 2502 struct ethhdr *eth = eth_hdr(skb); 2503 2504 if (ntohs(eth->h_proto) == ETH_P_IPV6 || 2505 (ntohs(eth->h_proto) == ETH_P_IP && 2506 old_iph->frag_off & htons(IP_DF))) 2507 df = htons(IP_DF); 2508 } 2509 } else if (test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, 2510 info->key.tun_flags)) { 2511 df = htons(IP_DF); 2512 } 2513 2514 ndst = &rt->dst; 2515 err = skb_tunnel_check_pmtu(skb, ndst, vxlan_headroom(flags & VXLAN_F_GPE), 2516 netif_is_any_bridge_port(dev)); 2517 if (err < 0) { 2518 goto tx_error; 2519 } else if (err) { 2520 if (info) { 2521 struct ip_tunnel_info *unclone; 2522 2523 unclone = skb_tunnel_info_unclone(skb); 2524 if (unlikely(!unclone)) 2525 goto tx_error; 2526 2527 unclone->key.u.ipv4.src = pkey->u.ipv4.dst; 2528 unclone->key.u.ipv4.dst = saddr; 2529 } 2530 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2531 dst_release(ndst); 2532 goto out_unlock; 2533 } 2534 2535 tos = ip_tunnel_ecn_encap(tos, old_iph, skb); 2536 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 2537 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr), 2538 vni, md, flags, udp_sum); 2539 if (err < 0) { 2540 reason = SKB_DROP_REASON_NOMEM; 2541 goto tx_error; 2542 } 2543 2544 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, saddr, 2545 pkey->u.ipv4.dst, tos, ttl, df, 2546 src_port, dst_port, xnet, !udp_sum, 2547 ipcb_flags); 2548 #if IS_ENABLED(CONFIG_IPV6) 2549 } else { 2550 struct vxlan_sock *sock6; 2551 struct in6_addr saddr; 2552 u16 ip6cb_flags = 0; 2553 2554 sock6 = rcu_dereference(vxlan->vn6_sock); 2555 if (unlikely(!sock6)) { 2556 reason = SKB_DROP_REASON_DEV_READY; 2557 goto tx_error; 2558 } 2559 2560 if (!ifindex) 2561 ifindex = sock6->sock->sk->sk_bound_dev_if; 2562 2563 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock, 2564 ifindex, &saddr, pkey, 2565 src_port, dst_port, tos, 2566 use_cache ? dst_cache : NULL); 2567 if (IS_ERR(ndst)) { 2568 err = PTR_ERR(ndst); 2569 ndst = NULL; 2570 reason = SKB_DROP_REASON_IP_OUTNOROUTES; 2571 goto tx_error; 2572 } 2573 2574 if (flags & VXLAN_F_MC_ROUTE) 2575 ip6cb_flags |= IP6SKB_MCROUTE; 2576 2577 if (!info) { 2578 u32 rt6i_flags = dst_rt6_info(ndst)->rt6i_flags; 2579 2580 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET6, 2581 dst_port, ifindex, vni, 2582 ndst, rt6i_flags); 2583 if (err) 2584 goto out_unlock; 2585 } 2586 2587 err = skb_tunnel_check_pmtu(skb, ndst, 2588 vxlan_headroom((flags & VXLAN_F_GPE) | VXLAN_F_IPV6), 2589 netif_is_any_bridge_port(dev)); 2590 if (err < 0) { 2591 goto tx_error; 2592 } else if (err) { 2593 if (info) { 2594 struct ip_tunnel_info *unclone; 2595 2596 unclone = skb_tunnel_info_unclone(skb); 2597 if (unlikely(!unclone)) 2598 goto tx_error; 2599 2600 unclone->key.u.ipv6.src = pkey->u.ipv6.dst; 2601 unclone->key.u.ipv6.dst = saddr; 2602 } 2603 2604 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2605 dst_release(ndst); 2606 goto out_unlock; 2607 } 2608 2609 tos = ip_tunnel_ecn_encap(tos, old_iph, skb); 2610 ttl = ttl ? : ip6_dst_hoplimit(ndst); 2611 skb_scrub_packet(skb, xnet); 2612 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr), 2613 vni, md, flags, udp_sum); 2614 if (err < 0) { 2615 reason = SKB_DROP_REASON_NOMEM; 2616 goto tx_error; 2617 } 2618 2619 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev, 2620 &saddr, &pkey->u.ipv6.dst, tos, ttl, 2621 pkey->label, src_port, dst_port, !udp_sum, 2622 ip6cb_flags); 2623 #endif 2624 } 2625 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX, pkt_len); 2626 out_unlock: 2627 rcu_read_unlock(); 2628 return; 2629 2630 drop: 2631 dev_dstats_tx_dropped(dev); 2632 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0); 2633 kfree_skb_reason(skb, reason); 2634 return; 2635 2636 tx_error: 2637 rcu_read_unlock(); 2638 if (err == -ELOOP) 2639 DEV_STATS_INC(dev, collisions); 2640 else if (err == -ENETUNREACH) 2641 DEV_STATS_INC(dev, tx_carrier_errors); 2642 dst_release(ndst); 2643 DEV_STATS_INC(dev, tx_errors); 2644 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0); 2645 kfree_skb_reason(skb, reason); 2646 } 2647 2648 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev, 2649 struct vxlan_fdb *f, __be32 vni, bool did_rsc) 2650 { 2651 struct vxlan_rdst nh_rdst; 2652 struct nexthop *nh; 2653 bool do_xmit; 2654 u32 hash; 2655 2656 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2657 hash = skb_get_hash(skb); 2658 2659 nh = rcu_dereference(f->nh); 2660 if (!nh) 2661 goto drop; 2662 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2663 2664 if (likely(do_xmit)) 2665 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc); 2666 else 2667 goto drop; 2668 2669 return; 2670 2671 drop: 2672 dev_dstats_tx_dropped(dev); 2673 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2674 VXLAN_VNI_STATS_TX_DROPS, 0); 2675 dev_kfree_skb(skb); 2676 } 2677 2678 static netdev_tx_t vxlan_xmit_nhid(struct sk_buff *skb, struct net_device *dev, 2679 u32 nhid, __be32 vni) 2680 { 2681 struct vxlan_dev *vxlan = netdev_priv(dev); 2682 struct vxlan_rdst nh_rdst; 2683 struct nexthop *nh; 2684 bool do_xmit; 2685 u32 hash; 2686 2687 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2688 hash = skb_get_hash(skb); 2689 2690 rcu_read_lock(); 2691 nh = nexthop_find_by_id(dev_net(dev), nhid); 2692 if (unlikely(!nh || !nexthop_is_fdb(nh) || !nexthop_is_multipath(nh))) { 2693 rcu_read_unlock(); 2694 goto drop; 2695 } 2696 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2697 rcu_read_unlock(); 2698 2699 if (vxlan->cfg.saddr.sa.sa_family != nh_rdst.remote_ip.sa.sa_family) 2700 goto drop; 2701 2702 if (likely(do_xmit)) 2703 vxlan_xmit_one(skb, dev, vni, &nh_rdst, false); 2704 else 2705 goto drop; 2706 2707 return NETDEV_TX_OK; 2708 2709 drop: 2710 dev_dstats_tx_dropped(dev); 2711 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2712 VXLAN_VNI_STATS_TX_DROPS, 0); 2713 dev_kfree_skb(skb); 2714 return NETDEV_TX_OK; 2715 } 2716 2717 /* Transmit local packets over Vxlan 2718 * 2719 * Outer IP header inherits ECN and DF from inner header. 2720 * Outer UDP destination is the VXLAN assigned port. 2721 * source port is based on hash of flow 2722 */ 2723 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) 2724 { 2725 struct vxlan_dev *vxlan = netdev_priv(dev); 2726 struct vxlan_rdst *rdst, *fdst = NULL; 2727 const struct ip_tunnel_info *info; 2728 struct vxlan_fdb *f; 2729 struct ethhdr *eth; 2730 __be32 vni = 0; 2731 u32 nhid = 0; 2732 bool did_rsc; 2733 2734 info = skb_tunnel_info(skb); 2735 2736 skb_reset_mac_header(skb); 2737 2738 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { 2739 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE && 2740 info->mode & IP_TUNNEL_INFO_TX) { 2741 vni = tunnel_id_to_key32(info->key.tun_id); 2742 nhid = info->key.nhid; 2743 } else { 2744 if (info && info->mode & IP_TUNNEL_INFO_TX) 2745 vxlan_xmit_one(skb, dev, vni, NULL, false); 2746 else 2747 kfree_skb_reason(skb, SKB_DROP_REASON_TUNNEL_TXINFO); 2748 return NETDEV_TX_OK; 2749 } 2750 } 2751 2752 if (vxlan->cfg.flags & VXLAN_F_PROXY) { 2753 eth = eth_hdr(skb); 2754 if (ntohs(eth->h_proto) == ETH_P_ARP) 2755 return arp_reduce(dev, skb, vni); 2756 #if IS_ENABLED(CONFIG_IPV6) 2757 else if (ntohs(eth->h_proto) == ETH_P_IPV6 && 2758 pskb_may_pull(skb, sizeof(struct ipv6hdr) + 2759 sizeof(struct nd_msg)) && 2760 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) { 2761 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1); 2762 2763 if (m->icmph.icmp6_code == 0 && 2764 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) 2765 return neigh_reduce(dev, skb, vni); 2766 } 2767 #endif 2768 } 2769 2770 if (nhid) 2771 return vxlan_xmit_nhid(skb, dev, nhid, vni); 2772 2773 if (vxlan->cfg.flags & VXLAN_F_MDB) { 2774 struct vxlan_mdb_entry *mdb_entry; 2775 2776 rcu_read_lock(); 2777 mdb_entry = vxlan_mdb_entry_skb_get(vxlan, skb, vni); 2778 if (mdb_entry) { 2779 netdev_tx_t ret; 2780 2781 ret = vxlan_mdb_xmit(vxlan, mdb_entry, skb); 2782 rcu_read_unlock(); 2783 return ret; 2784 } 2785 rcu_read_unlock(); 2786 } 2787 2788 eth = eth_hdr(skb); 2789 rcu_read_lock(); 2790 f = vxlan_find_mac_tx(vxlan, eth->h_dest, vni); 2791 did_rsc = false; 2792 2793 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) && 2794 (ntohs(eth->h_proto) == ETH_P_IP || 2795 ntohs(eth->h_proto) == ETH_P_IPV6)) { 2796 did_rsc = route_shortcircuit(dev, skb); 2797 if (did_rsc) 2798 f = vxlan_find_mac_tx(vxlan, eth->h_dest, vni); 2799 } 2800 2801 if (f == NULL) { 2802 f = vxlan_find_mac_tx(vxlan, all_zeros_mac, vni); 2803 if (f == NULL) { 2804 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) && 2805 !is_multicast_ether_addr(eth->h_dest)) 2806 vxlan_fdb_miss(vxlan, eth->h_dest); 2807 2808 dev_dstats_tx_dropped(dev); 2809 vxlan_vnifilter_count(vxlan, vni, NULL, 2810 VXLAN_VNI_STATS_TX_DROPS, 0); 2811 kfree_skb_reason(skb, SKB_DROP_REASON_NO_TX_TARGET); 2812 goto out; 2813 } 2814 } 2815 2816 if (rcu_access_pointer(f->nh)) { 2817 vxlan_xmit_nh(skb, dev, f, 2818 (vni ? : vxlan->default_dst.remote_vni), did_rsc); 2819 } else { 2820 list_for_each_entry_rcu(rdst, &f->remotes, list) { 2821 struct sk_buff *skb1; 2822 2823 if (!fdst) { 2824 fdst = rdst; 2825 continue; 2826 } 2827 skb1 = skb_clone(skb, GFP_ATOMIC); 2828 if (skb1) 2829 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc); 2830 } 2831 if (fdst) 2832 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc); 2833 else 2834 kfree_skb_reason(skb, SKB_DROP_REASON_NO_TX_TARGET); 2835 } 2836 2837 out: 2838 rcu_read_unlock(); 2839 return NETDEV_TX_OK; 2840 } 2841 2842 /* Walk the forwarding table and purge stale entries */ 2843 static void vxlan_cleanup(struct timer_list *t) 2844 { 2845 struct vxlan_dev *vxlan = timer_container_of(vxlan, t, age_timer); 2846 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; 2847 struct vxlan_fdb *f; 2848 2849 if (!netif_running(vxlan->dev)) 2850 return; 2851 2852 rcu_read_lock(); 2853 hlist_for_each_entry_rcu(f, &vxlan->fdb_list, fdb_node) { 2854 unsigned long timeout; 2855 2856 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 2857 continue; 2858 2859 if (f->flags & NTF_EXT_LEARNED) 2860 continue; 2861 2862 timeout = READ_ONCE(f->updated) + vxlan->cfg.age_interval * HZ; 2863 if (time_before_eq(timeout, jiffies)) { 2864 spin_lock(&vxlan->hash_lock); 2865 if (!hlist_unhashed(&f->fdb_node)) { 2866 netdev_dbg(vxlan->dev, "garbage collect %pM\n", 2867 f->key.eth_addr); 2868 f->state = NUD_STALE; 2869 vxlan_fdb_destroy(vxlan, f, true, true); 2870 } 2871 spin_unlock(&vxlan->hash_lock); 2872 } else if (time_before(timeout, next_timer)) { 2873 next_timer = timeout; 2874 } 2875 } 2876 rcu_read_unlock(); 2877 2878 mod_timer(&vxlan->age_timer, next_timer); 2879 } 2880 2881 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan) 2882 { 2883 ASSERT_RTNL(); 2884 2885 hlist_del_init_rcu(&vxlan->hlist4.hlist); 2886 #if IS_ENABLED(CONFIG_IPV6) 2887 hlist_del_init_rcu(&vxlan->hlist6.hlist); 2888 #endif 2889 } 2890 2891 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan, 2892 struct vxlan_dev_node *node) 2893 { 2894 __be32 vni = vxlan->default_dst.remote_vni; 2895 2896 ASSERT_RTNL(); 2897 2898 node->vxlan = vxlan; 2899 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni)); 2900 } 2901 2902 /* Setup stats when device is created */ 2903 static int vxlan_init(struct net_device *dev) 2904 { 2905 struct vxlan_dev *vxlan = netdev_priv(dev); 2906 int err; 2907 2908 err = rhashtable_init(&vxlan->fdb_hash_tbl, &vxlan_fdb_rht_params); 2909 if (err) 2910 return err; 2911 2912 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 2913 err = vxlan_vnigroup_init(vxlan); 2914 if (err) 2915 goto err_rhashtable_destroy; 2916 } 2917 2918 err = gro_cells_init(&vxlan->gro_cells, dev); 2919 if (err) 2920 goto err_vnigroup_uninit; 2921 2922 err = vxlan_mdb_init(vxlan); 2923 if (err) 2924 goto err_gro_cells_destroy; 2925 2926 netdev_lockdep_set_classes(dev); 2927 return 0; 2928 2929 err_gro_cells_destroy: 2930 gro_cells_destroy(&vxlan->gro_cells); 2931 err_vnigroup_uninit: 2932 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2933 vxlan_vnigroup_uninit(vxlan); 2934 err_rhashtable_destroy: 2935 rhashtable_destroy(&vxlan->fdb_hash_tbl); 2936 return err; 2937 } 2938 2939 static void vxlan_uninit(struct net_device *dev) 2940 { 2941 struct vxlan_dev *vxlan = netdev_priv(dev); 2942 2943 vxlan_mdb_fini(vxlan); 2944 2945 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2946 vxlan_vnigroup_uninit(vxlan); 2947 2948 gro_cells_destroy(&vxlan->gro_cells); 2949 2950 rhashtable_destroy(&vxlan->fdb_hash_tbl); 2951 } 2952 2953 /* Start ageing timer and join group when device is brought up */ 2954 static int vxlan_open(struct net_device *dev) 2955 { 2956 struct vxlan_dev *vxlan = netdev_priv(dev); 2957 int ret; 2958 2959 ret = vxlan_sock_add(vxlan); 2960 if (ret < 0) 2961 return ret; 2962 2963 ret = vxlan_multicast_join(vxlan); 2964 if (ret) { 2965 vxlan_sock_release(vxlan); 2966 return ret; 2967 } 2968 2969 if (vxlan->cfg.age_interval) 2970 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); 2971 2972 return ret; 2973 } 2974 2975 struct vxlan_fdb_flush_desc { 2976 bool ignore_default_entry; 2977 unsigned long state; 2978 unsigned long state_mask; 2979 unsigned long flags; 2980 unsigned long flags_mask; 2981 __be32 src_vni; 2982 u32 nhid; 2983 __be32 vni; 2984 __be16 port; 2985 union vxlan_addr dst_ip; 2986 }; 2987 2988 static bool vxlan_fdb_is_default_entry(const struct vxlan_fdb *f, 2989 const struct vxlan_dev *vxlan) 2990 { 2991 return is_zero_ether_addr(f->key.eth_addr) && 2992 f->key.vni == vxlan->cfg.vni; 2993 } 2994 2995 static bool vxlan_fdb_nhid_matches(const struct vxlan_fdb *f, u32 nhid) 2996 { 2997 struct nexthop *nh = rtnl_dereference(f->nh); 2998 2999 return nh && nh->id == nhid; 3000 } 3001 3002 static bool vxlan_fdb_flush_matches(const struct vxlan_fdb *f, 3003 const struct vxlan_dev *vxlan, 3004 const struct vxlan_fdb_flush_desc *desc) 3005 { 3006 if (desc->state_mask && (f->state & desc->state_mask) != desc->state) 3007 return false; 3008 3009 if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags) 3010 return false; 3011 3012 if (desc->ignore_default_entry && vxlan_fdb_is_default_entry(f, vxlan)) 3013 return false; 3014 3015 if (desc->src_vni && f->key.vni != desc->src_vni) 3016 return false; 3017 3018 if (desc->nhid && !vxlan_fdb_nhid_matches(f, desc->nhid)) 3019 return false; 3020 3021 return true; 3022 } 3023 3024 static bool 3025 vxlan_fdb_flush_should_match_remotes(const struct vxlan_fdb_flush_desc *desc) 3026 { 3027 return desc->vni || desc->port || desc->dst_ip.sa.sa_family; 3028 } 3029 3030 static bool 3031 vxlan_fdb_flush_remote_matches(const struct vxlan_fdb_flush_desc *desc, 3032 const struct vxlan_rdst *rd) 3033 { 3034 if (desc->vni && rd->remote_vni != desc->vni) 3035 return false; 3036 3037 if (desc->port && rd->remote_port != desc->port) 3038 return false; 3039 3040 if (desc->dst_ip.sa.sa_family && 3041 !vxlan_addr_equal(&rd->remote_ip, &desc->dst_ip)) 3042 return false; 3043 3044 return true; 3045 } 3046 3047 static void 3048 vxlan_fdb_flush_match_remotes(struct vxlan_fdb *f, struct vxlan_dev *vxlan, 3049 const struct vxlan_fdb_flush_desc *desc, 3050 bool *p_destroy_fdb) 3051 { 3052 bool remotes_flushed = false; 3053 struct vxlan_rdst *rd, *tmp; 3054 3055 list_for_each_entry_safe(rd, tmp, &f->remotes, list) { 3056 if (!vxlan_fdb_flush_remote_matches(desc, rd)) 3057 continue; 3058 3059 vxlan_fdb_dst_destroy(vxlan, f, rd, true); 3060 remotes_flushed = true; 3061 } 3062 3063 *p_destroy_fdb = remotes_flushed && list_empty(&f->remotes); 3064 } 3065 3066 /* Purge the forwarding table */ 3067 static void vxlan_flush(struct vxlan_dev *vxlan, 3068 const struct vxlan_fdb_flush_desc *desc) 3069 { 3070 bool match_remotes = vxlan_fdb_flush_should_match_remotes(desc); 3071 struct vxlan_fdb *f; 3072 3073 rcu_read_lock(); 3074 hlist_for_each_entry_rcu(f, &vxlan->fdb_list, fdb_node) { 3075 if (!vxlan_fdb_flush_matches(f, vxlan, desc)) 3076 continue; 3077 3078 spin_lock_bh(&vxlan->hash_lock); 3079 if (hlist_unhashed(&f->fdb_node)) 3080 goto unlock; 3081 3082 if (match_remotes) { 3083 bool destroy_fdb = false; 3084 3085 vxlan_fdb_flush_match_remotes(f, vxlan, desc, 3086 &destroy_fdb); 3087 3088 if (!destroy_fdb) 3089 goto unlock; 3090 } 3091 3092 vxlan_fdb_destroy(vxlan, f, true, true); 3093 unlock: 3094 spin_unlock_bh(&vxlan->hash_lock); 3095 } 3096 rcu_read_unlock(); 3097 } 3098 3099 static const struct nla_policy vxlan_del_bulk_policy[NDA_MAX + 1] = { 3100 [NDA_SRC_VNI] = { .type = NLA_U32 }, 3101 [NDA_NH_ID] = { .type = NLA_U32 }, 3102 [NDA_VNI] = { .type = NLA_U32 }, 3103 [NDA_PORT] = { .type = NLA_U16 }, 3104 [NDA_DST] = NLA_POLICY_RANGE(NLA_BINARY, sizeof(struct in_addr), 3105 sizeof(struct in6_addr)), 3106 [NDA_NDM_STATE_MASK] = { .type = NLA_U16 }, 3107 [NDA_NDM_FLAGS_MASK] = { .type = NLA_U8 }, 3108 }; 3109 3110 #define VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS (NTF_MASTER | NTF_SELF) 3111 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES (NUD_PERMANENT | NUD_NOARP) 3112 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS (NTF_EXT_LEARNED | NTF_OFFLOADED | \ 3113 NTF_ROUTER) 3114 3115 static int vxlan_fdb_delete_bulk(struct nlmsghdr *nlh, struct net_device *dev, 3116 struct netlink_ext_ack *extack) 3117 { 3118 struct vxlan_dev *vxlan = netdev_priv(dev); 3119 struct vxlan_fdb_flush_desc desc = {}; 3120 struct ndmsg *ndm = nlmsg_data(nlh); 3121 struct nlattr *tb[NDA_MAX + 1]; 3122 u8 ndm_flags; 3123 int err; 3124 3125 ndm_flags = ndm->ndm_flags & ~VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS; 3126 3127 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, vxlan_del_bulk_policy, 3128 extack); 3129 if (err) 3130 return err; 3131 3132 if (ndm_flags & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS) { 3133 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set"); 3134 return -EINVAL; 3135 } 3136 if (ndm->ndm_state & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES) { 3137 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set"); 3138 return -EINVAL; 3139 } 3140 3141 desc.state = ndm->ndm_state; 3142 desc.flags = ndm_flags; 3143 3144 if (tb[NDA_NDM_STATE_MASK]) 3145 desc.state_mask = nla_get_u16(tb[NDA_NDM_STATE_MASK]); 3146 3147 if (tb[NDA_NDM_FLAGS_MASK]) 3148 desc.flags_mask = nla_get_u8(tb[NDA_NDM_FLAGS_MASK]); 3149 3150 if (tb[NDA_SRC_VNI]) 3151 desc.src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 3152 3153 if (tb[NDA_NH_ID]) 3154 desc.nhid = nla_get_u32(tb[NDA_NH_ID]); 3155 3156 if (tb[NDA_VNI]) 3157 desc.vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 3158 3159 if (tb[NDA_PORT]) 3160 desc.port = nla_get_be16(tb[NDA_PORT]); 3161 3162 if (tb[NDA_DST]) { 3163 union vxlan_addr ip; 3164 3165 err = vxlan_nla_get_addr(&ip, tb[NDA_DST]); 3166 if (err) { 3167 NL_SET_ERR_MSG_ATTR(extack, tb[NDA_DST], 3168 "Unsupported address family"); 3169 return err; 3170 } 3171 desc.dst_ip = ip; 3172 } 3173 3174 vxlan_flush(vxlan, &desc); 3175 3176 return 0; 3177 } 3178 3179 /* Cleanup timer and forwarding table on shutdown */ 3180 static int vxlan_stop(struct net_device *dev) 3181 { 3182 struct vxlan_dev *vxlan = netdev_priv(dev); 3183 struct vxlan_fdb_flush_desc desc = { 3184 /* Default entry is deleted at vxlan_dellink. */ 3185 .ignore_default_entry = true, 3186 .state = 0, 3187 .state_mask = NUD_PERMANENT | NUD_NOARP, 3188 }; 3189 3190 vxlan_multicast_leave(vxlan); 3191 3192 timer_delete_sync(&vxlan->age_timer); 3193 3194 vxlan_flush(vxlan, &desc); 3195 vxlan_sock_release(vxlan); 3196 3197 return 0; 3198 } 3199 3200 /* Stub, nothing needs to be done. */ 3201 static void vxlan_set_multicast_list(struct net_device *dev) 3202 { 3203 } 3204 3205 static int vxlan_change_mtu(struct net_device *dev, int new_mtu) 3206 { 3207 struct vxlan_dev *vxlan = netdev_priv(dev); 3208 struct vxlan_rdst *dst = &vxlan->default_dst; 3209 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3210 dst->remote_ifindex); 3211 3212 /* This check is different than dev->max_mtu, because it looks at 3213 * the lowerdev->mtu, rather than the static dev->max_mtu 3214 */ 3215 if (lowerdev) { 3216 int max_mtu = lowerdev->mtu - vxlan_headroom(vxlan->cfg.flags); 3217 if (new_mtu > max_mtu) 3218 return -EINVAL; 3219 } 3220 3221 WRITE_ONCE(dev->mtu, new_mtu); 3222 return 0; 3223 } 3224 3225 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 3226 { 3227 struct vxlan_dev *vxlan = netdev_priv(dev); 3228 struct ip_tunnel_info *info = skb_tunnel_info(skb); 3229 __be16 sport, dport; 3230 3231 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 3232 vxlan->cfg.port_max, true); 3233 dport = info->key.tp_dst ? : vxlan->cfg.dst_port; 3234 3235 if (ip_tunnel_info_af(info) == AF_INET) { 3236 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); 3237 struct rtable *rt; 3238 3239 if (!sock4) 3240 return -EIO; 3241 3242 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, 0, 3243 &info->key.u.ipv4.src, 3244 &info->key, 3245 sport, dport, info->key.tos, 3246 &info->dst_cache); 3247 if (IS_ERR(rt)) 3248 return PTR_ERR(rt); 3249 ip_rt_put(rt); 3250 } else { 3251 #if IS_ENABLED(CONFIG_IPV6) 3252 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); 3253 struct dst_entry *ndst; 3254 3255 if (!sock6) 3256 return -EIO; 3257 3258 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock, 3259 0, &info->key.u.ipv6.src, 3260 &info->key, 3261 sport, dport, info->key.tos, 3262 &info->dst_cache); 3263 if (IS_ERR(ndst)) 3264 return PTR_ERR(ndst); 3265 dst_release(ndst); 3266 #else /* !CONFIG_IPV6 */ 3267 return -EPFNOSUPPORT; 3268 #endif 3269 } 3270 info->key.tp_src = sport; 3271 info->key.tp_dst = dport; 3272 return 0; 3273 } 3274 3275 static const struct net_device_ops vxlan_netdev_ether_ops = { 3276 .ndo_init = vxlan_init, 3277 .ndo_uninit = vxlan_uninit, 3278 .ndo_open = vxlan_open, 3279 .ndo_stop = vxlan_stop, 3280 .ndo_start_xmit = vxlan_xmit, 3281 .ndo_set_rx_mode = vxlan_set_multicast_list, 3282 .ndo_change_mtu = vxlan_change_mtu, 3283 .ndo_validate_addr = eth_validate_addr, 3284 .ndo_set_mac_address = eth_mac_addr, 3285 .ndo_fdb_add = vxlan_fdb_add, 3286 .ndo_fdb_del = vxlan_fdb_delete, 3287 .ndo_fdb_del_bulk = vxlan_fdb_delete_bulk, 3288 .ndo_fdb_dump = vxlan_fdb_dump, 3289 .ndo_fdb_get = vxlan_fdb_get, 3290 .ndo_mdb_add = vxlan_mdb_add, 3291 .ndo_mdb_del = vxlan_mdb_del, 3292 .ndo_mdb_del_bulk = vxlan_mdb_del_bulk, 3293 .ndo_mdb_dump = vxlan_mdb_dump, 3294 .ndo_mdb_get = vxlan_mdb_get, 3295 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3296 }; 3297 3298 static const struct net_device_ops vxlan_netdev_raw_ops = { 3299 .ndo_init = vxlan_init, 3300 .ndo_uninit = vxlan_uninit, 3301 .ndo_open = vxlan_open, 3302 .ndo_stop = vxlan_stop, 3303 .ndo_start_xmit = vxlan_xmit, 3304 .ndo_change_mtu = vxlan_change_mtu, 3305 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3306 }; 3307 3308 /* Info for udev, that this is a virtual tunnel endpoint */ 3309 static const struct device_type vxlan_type = { 3310 .name = "vxlan", 3311 }; 3312 3313 /* Calls the ndo_udp_tunnel_add of the caller in order to 3314 * supply the listening VXLAN udp ports. Callers are expected 3315 * to implement the ndo_udp_tunnel_add. 3316 */ 3317 static void vxlan_offload_rx_ports(struct net_device *dev, bool push) 3318 { 3319 struct vxlan_sock *vs; 3320 struct net *net = dev_net(dev); 3321 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3322 unsigned int i; 3323 3324 ASSERT_RTNL(); 3325 3326 for (i = 0; i < PORT_HASH_SIZE; ++i) { 3327 hlist_for_each_entry(vs, &vn->sock_list[i], hlist) { 3328 unsigned short type; 3329 3330 if (vs->flags & VXLAN_F_GPE) 3331 type = UDP_TUNNEL_TYPE_VXLAN_GPE; 3332 else 3333 type = UDP_TUNNEL_TYPE_VXLAN; 3334 3335 if (push) 3336 udp_tunnel_push_rx_port(dev, vs->sock, type); 3337 else 3338 udp_tunnel_drop_rx_port(dev, vs->sock, type); 3339 } 3340 } 3341 } 3342 3343 /* Initialize the device structure. */ 3344 static void vxlan_setup(struct net_device *dev) 3345 { 3346 struct vxlan_dev *vxlan = netdev_priv(dev); 3347 3348 eth_hw_addr_random(dev); 3349 ether_setup(dev); 3350 3351 dev->needs_free_netdev = true; 3352 SET_NETDEV_DEVTYPE(dev, &vxlan_type); 3353 3354 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3355 dev->features |= NETIF_F_RXCSUM; 3356 dev->features |= NETIF_F_GSO_SOFTWARE; 3357 3358 /* Partial features are disabled by default. */ 3359 dev->vlan_features = dev->features; 3360 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3361 dev->hw_features |= NETIF_F_RXCSUM; 3362 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 3363 dev->hw_features |= UDP_TUNNEL_PARTIAL_FEATURES; 3364 dev->hw_features |= NETIF_F_GSO_PARTIAL; 3365 3366 dev->hw_enc_features = dev->hw_features; 3367 dev->gso_partial_features = UDP_TUNNEL_PARTIAL_FEATURES; 3368 dev->mangleid_features = NETIF_F_GSO_PARTIAL; 3369 3370 netif_keep_dst(dev); 3371 dev->priv_flags |= IFF_NO_QUEUE; 3372 dev->change_proto_down = true; 3373 dev->lltx = true; 3374 3375 /* MTU range: 68 - 65535 */ 3376 dev->min_mtu = ETH_MIN_MTU; 3377 dev->max_mtu = ETH_MAX_MTU; 3378 3379 dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS; 3380 INIT_LIST_HEAD(&vxlan->next); 3381 spin_lock_init(&vxlan->hash_lock); 3382 3383 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE); 3384 3385 vxlan->dev = dev; 3386 3387 INIT_HLIST_HEAD(&vxlan->fdb_list); 3388 } 3389 3390 static void vxlan_ether_setup(struct net_device *dev) 3391 { 3392 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 3393 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 3394 dev->netdev_ops = &vxlan_netdev_ether_ops; 3395 } 3396 3397 static void vxlan_raw_setup(struct net_device *dev) 3398 { 3399 dev->header_ops = NULL; 3400 dev->type = ARPHRD_NONE; 3401 dev->hard_header_len = 0; 3402 dev->addr_len = 0; 3403 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 3404 dev->netdev_ops = &vxlan_netdev_raw_ops; 3405 } 3406 3407 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { 3408 [IFLA_VXLAN_UNSPEC] = { .strict_start_type = IFLA_VXLAN_LOCALBYPASS }, 3409 [IFLA_VXLAN_ID] = { .type = NLA_U32 }, 3410 [IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) }, 3411 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) }, 3412 [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, 3413 [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, 3414 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) }, 3415 [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, 3416 [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, 3417 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 }, 3418 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, 3419 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, 3420 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, 3421 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, 3422 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, 3423 [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, 3424 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, 3425 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, 3426 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 }, 3427 [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, 3428 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 }, 3429 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 3430 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 3431 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 }, 3432 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 }, 3433 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, }, 3434 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, }, 3435 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG }, 3436 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG }, 3437 [IFLA_VXLAN_DF] = { .type = NLA_U8 }, 3438 [IFLA_VXLAN_VNIFILTER] = { .type = NLA_U8 }, 3439 [IFLA_VXLAN_LOCALBYPASS] = NLA_POLICY_MAX(NLA_U8, 1), 3440 [IFLA_VXLAN_LABEL_POLICY] = NLA_POLICY_MAX(NLA_U32, VXLAN_LABEL_MAX), 3441 [IFLA_VXLAN_RESERVED_BITS] = NLA_POLICY_EXACT_LEN(sizeof(struct vxlanhdr)), 3442 [IFLA_VXLAN_MC_ROUTE] = NLA_POLICY_MAX(NLA_U8, 1), 3443 }; 3444 3445 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[], 3446 struct netlink_ext_ack *extack) 3447 { 3448 if (tb[IFLA_ADDRESS]) { 3449 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 3450 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3451 "Provided link layer address is not Ethernet"); 3452 return -EINVAL; 3453 } 3454 3455 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 3456 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3457 "Provided Ethernet address is not unicast"); 3458 return -EADDRNOTAVAIL; 3459 } 3460 } 3461 3462 if (tb[IFLA_MTU]) { 3463 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 3464 3465 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) { 3466 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 3467 "MTU must be between 68 and 65535"); 3468 return -EINVAL; 3469 } 3470 } 3471 3472 if (!data) { 3473 NL_SET_ERR_MSG(extack, 3474 "Required attributes not provided to perform the operation"); 3475 return -EINVAL; 3476 } 3477 3478 if (data[IFLA_VXLAN_ID]) { 3479 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); 3480 3481 if (id >= VXLAN_N_VID) { 3482 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID], 3483 "VXLAN ID must be lower than 16777216"); 3484 return -ERANGE; 3485 } 3486 } 3487 3488 if (data[IFLA_VXLAN_PORT_RANGE]) { 3489 const struct ifla_vxlan_port_range *p 3490 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 3491 3492 if (ntohs(p->high) < ntohs(p->low)) { 3493 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE], 3494 "Invalid source port range"); 3495 return -EINVAL; 3496 } 3497 } 3498 3499 if (data[IFLA_VXLAN_DF]) { 3500 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]); 3501 3502 if (df < 0 || df > VXLAN_DF_MAX) { 3503 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF], 3504 "Invalid DF attribute"); 3505 return -EINVAL; 3506 } 3507 } 3508 3509 return 0; 3510 } 3511 3512 static void vxlan_get_drvinfo(struct net_device *netdev, 3513 struct ethtool_drvinfo *drvinfo) 3514 { 3515 strscpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); 3516 strscpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); 3517 } 3518 3519 static int vxlan_get_link_ksettings(struct net_device *dev, 3520 struct ethtool_link_ksettings *cmd) 3521 { 3522 struct vxlan_dev *vxlan = netdev_priv(dev); 3523 struct vxlan_rdst *dst = &vxlan->default_dst; 3524 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3525 dst->remote_ifindex); 3526 3527 if (!lowerdev) { 3528 cmd->base.duplex = DUPLEX_UNKNOWN; 3529 cmd->base.port = PORT_OTHER; 3530 cmd->base.speed = SPEED_UNKNOWN; 3531 3532 return 0; 3533 } 3534 3535 return __ethtool_get_link_ksettings(lowerdev, cmd); 3536 } 3537 3538 static const struct ethtool_ops vxlan_ethtool_ops = { 3539 .get_drvinfo = vxlan_get_drvinfo, 3540 .get_link = ethtool_op_get_link, 3541 .get_link_ksettings = vxlan_get_link_ksettings, 3542 }; 3543 3544 static struct socket *vxlan_create_sock(struct net *net, bool ipv6, 3545 __be16 port, u32 flags, int ifindex) 3546 { 3547 struct socket *sock; 3548 struct udp_port_cfg udp_conf; 3549 int err; 3550 3551 memset(&udp_conf, 0, sizeof(udp_conf)); 3552 3553 if (ipv6) { 3554 udp_conf.family = AF_INET6; 3555 udp_conf.use_udp6_rx_checksums = 3556 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX); 3557 udp_conf.ipv6_v6only = 1; 3558 } else { 3559 udp_conf.family = AF_INET; 3560 } 3561 3562 udp_conf.local_udp_port = port; 3563 udp_conf.bind_ifindex = ifindex; 3564 3565 /* Open UDP socket */ 3566 err = udp_sock_create(net, &udp_conf, &sock); 3567 if (err < 0) 3568 return ERR_PTR(err); 3569 3570 udp_allow_gso(sock->sk); 3571 return sock; 3572 } 3573 3574 /* Create new listen socket if needed */ 3575 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6, 3576 __be16 port, u32 flags, 3577 int ifindex) 3578 { 3579 struct vxlan_sock *vs; 3580 struct socket *sock; 3581 unsigned int h; 3582 struct udp_tunnel_sock_cfg tunnel_cfg; 3583 3584 ASSERT_RTNL(); 3585 3586 vs = kzalloc_obj(*vs); 3587 if (!vs) 3588 return ERR_PTR(-ENOMEM); 3589 3590 for (h = 0; h < VNI_HASH_SIZE; ++h) 3591 INIT_HLIST_HEAD(&vs->vni_list[h]); 3592 3593 sock = vxlan_create_sock(net, ipv6, port, flags, ifindex); 3594 if (IS_ERR(sock)) { 3595 kfree(vs); 3596 return ERR_CAST(sock); 3597 } 3598 3599 vs->sock = sock; 3600 refcount_set(&vs->refcnt, 1); 3601 vs->flags = (flags & VXLAN_F_RCV_FLAGS); 3602 3603 hlist_add_head_rcu(&vs->hlist, vs_head(net, port)); 3604 udp_tunnel_notify_add_rx_port(sock, 3605 (vs->flags & VXLAN_F_GPE) ? 3606 UDP_TUNNEL_TYPE_VXLAN_GPE : 3607 UDP_TUNNEL_TYPE_VXLAN); 3608 3609 /* Mark socket as an encapsulation socket. */ 3610 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 3611 tunnel_cfg.sk_user_data = vs; 3612 tunnel_cfg.encap_type = 1; 3613 tunnel_cfg.encap_rcv = vxlan_rcv; 3614 tunnel_cfg.encap_err_lookup = vxlan_err_lookup; 3615 tunnel_cfg.encap_destroy = NULL; 3616 if (vs->flags & VXLAN_F_GPE) { 3617 tunnel_cfg.gro_receive = vxlan_gpe_gro_receive; 3618 tunnel_cfg.gro_complete = vxlan_gpe_gro_complete; 3619 } else { 3620 tunnel_cfg.gro_receive = vxlan_gro_receive; 3621 tunnel_cfg.gro_complete = vxlan_gro_complete; 3622 } 3623 3624 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 3625 3626 return vs; 3627 } 3628 3629 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6) 3630 { 3631 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3632 struct vxlan_sock *vs = NULL; 3633 struct vxlan_dev_node *node; 3634 int l3mdev_index = 0; 3635 3636 ASSERT_RTNL(); 3637 3638 if (vxlan->cfg.remote_ifindex) 3639 l3mdev_index = l3mdev_master_upper_ifindex_by_index( 3640 vxlan->net, vxlan->cfg.remote_ifindex); 3641 3642 if (!vxlan->cfg.no_share) { 3643 rcu_read_lock(); 3644 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET, 3645 vxlan->cfg.dst_port, vxlan->cfg.flags, 3646 l3mdev_index); 3647 if (vs && !refcount_inc_not_zero(&vs->refcnt)) { 3648 rcu_read_unlock(); 3649 return -EBUSY; 3650 } 3651 rcu_read_unlock(); 3652 } 3653 if (!vs) 3654 vs = vxlan_socket_create(vxlan->net, ipv6, 3655 vxlan->cfg.dst_port, vxlan->cfg.flags, 3656 l3mdev_index); 3657 if (IS_ERR(vs)) 3658 return PTR_ERR(vs); 3659 #if IS_ENABLED(CONFIG_IPV6) 3660 if (ipv6) { 3661 rcu_assign_pointer(vxlan->vn6_sock, vs); 3662 node = &vxlan->hlist6; 3663 } else 3664 #endif 3665 { 3666 rcu_assign_pointer(vxlan->vn4_sock, vs); 3667 node = &vxlan->hlist4; 3668 } 3669 3670 if (metadata && (vxlan->cfg.flags & VXLAN_F_VNIFILTER)) 3671 vxlan_vs_add_vnigrp(vxlan, vs, ipv6); 3672 else 3673 vxlan_vs_add_dev(vs, vxlan, node); 3674 3675 return 0; 3676 } 3677 3678 static int vxlan_sock_add(struct vxlan_dev *vxlan) 3679 { 3680 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3681 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata; 3682 bool ipv4 = !ipv6 || metadata; 3683 int ret = 0; 3684 3685 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 3686 #if IS_ENABLED(CONFIG_IPV6) 3687 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 3688 if (ipv6) { 3689 ret = __vxlan_sock_add(vxlan, true); 3690 if (ret < 0 && ret != -EAFNOSUPPORT) 3691 ipv4 = false; 3692 } 3693 #endif 3694 if (ipv4) 3695 ret = __vxlan_sock_add(vxlan, false); 3696 if (ret < 0) 3697 vxlan_sock_release(vxlan); 3698 return ret; 3699 } 3700 3701 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan, 3702 struct vxlan_config *conf, __be32 vni) 3703 { 3704 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id); 3705 struct vxlan_dev *tmp; 3706 3707 list_for_each_entry(tmp, &vn->vxlan_list, next) { 3708 if (tmp == vxlan) 3709 continue; 3710 if (tmp->cfg.flags & VXLAN_F_VNIFILTER) { 3711 if (!vxlan_vnifilter_lookup(tmp, vni)) 3712 continue; 3713 } else if (tmp->cfg.vni != vni) { 3714 continue; 3715 } 3716 if (tmp->cfg.dst_port != conf->dst_port) 3717 continue; 3718 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) != 3719 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6))) 3720 continue; 3721 3722 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) && 3723 tmp->cfg.remote_ifindex != conf->remote_ifindex) 3724 continue; 3725 3726 return -EEXIST; 3727 } 3728 3729 return 0; 3730 } 3731 3732 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf, 3733 struct net_device **lower, 3734 struct vxlan_dev *old, 3735 struct netlink_ext_ack *extack) 3736 { 3737 bool use_ipv6 = false; 3738 3739 if (conf->flags & VXLAN_F_GPE) { 3740 /* For now, allow GPE only together with 3741 * COLLECT_METADATA. This can be relaxed later; in such 3742 * case, the other side of the PtP link will have to be 3743 * provided. 3744 */ 3745 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) || 3746 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3747 NL_SET_ERR_MSG(extack, 3748 "VXLAN GPE does not support this combination of attributes"); 3749 return -EINVAL; 3750 } 3751 } 3752 3753 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) { 3754 /* Unless IPv6 is explicitly requested, assume IPv4 */ 3755 conf->remote_ip.sa.sa_family = AF_INET; 3756 conf->saddr.sa.sa_family = AF_INET; 3757 } else if (!conf->remote_ip.sa.sa_family) { 3758 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family; 3759 } else if (!conf->saddr.sa.sa_family) { 3760 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family; 3761 } 3762 3763 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) { 3764 NL_SET_ERR_MSG(extack, 3765 "Local and remote address must be from the same family"); 3766 return -EINVAL; 3767 } 3768 3769 if (vxlan_addr_multicast(&conf->saddr)) { 3770 NL_SET_ERR_MSG(extack, "Local address cannot be multicast"); 3771 return -EINVAL; 3772 } 3773 3774 if (conf->saddr.sa.sa_family == AF_INET6) { 3775 if (!IS_ENABLED(CONFIG_IPV6)) { 3776 NL_SET_ERR_MSG(extack, 3777 "IPv6 support not enabled in the kernel"); 3778 return -EPFNOSUPPORT; 3779 } 3780 use_ipv6 = true; 3781 conf->flags |= VXLAN_F_IPV6; 3782 3783 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3784 int local_type = 3785 ipv6_addr_type(&conf->saddr.sin6.sin6_addr); 3786 int remote_type = 3787 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr); 3788 3789 if (local_type & IPV6_ADDR_LINKLOCAL) { 3790 if (!(remote_type & IPV6_ADDR_LINKLOCAL) && 3791 (remote_type != IPV6_ADDR_ANY)) { 3792 NL_SET_ERR_MSG(extack, 3793 "Invalid combination of local and remote address scopes"); 3794 return -EINVAL; 3795 } 3796 3797 conf->flags |= VXLAN_F_IPV6_LINKLOCAL; 3798 } else { 3799 if (remote_type == 3800 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) { 3801 NL_SET_ERR_MSG(extack, 3802 "Invalid combination of local and remote address scopes"); 3803 return -EINVAL; 3804 } 3805 3806 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL; 3807 } 3808 } 3809 } 3810 3811 if (conf->label && !use_ipv6) { 3812 NL_SET_ERR_MSG(extack, 3813 "Label attribute only applies to IPv6 VXLAN devices"); 3814 return -EINVAL; 3815 } 3816 3817 if (conf->label_policy && !use_ipv6) { 3818 NL_SET_ERR_MSG(extack, 3819 "Label policy only applies to IPv6 VXLAN devices"); 3820 return -EINVAL; 3821 } 3822 3823 if (conf->remote_ifindex) { 3824 struct net_device *lowerdev; 3825 3826 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex); 3827 if (!lowerdev) { 3828 NL_SET_ERR_MSG(extack, 3829 "Invalid local interface, device not found"); 3830 return -ENODEV; 3831 } 3832 3833 #if IS_ENABLED(CONFIG_IPV6) 3834 if (use_ipv6) { 3835 struct inet6_dev *idev = __in6_dev_get(lowerdev); 3836 3837 if (idev && idev->cnf.disable_ipv6) { 3838 NL_SET_ERR_MSG(extack, 3839 "IPv6 support disabled by administrator"); 3840 return -EPERM; 3841 } 3842 } 3843 #endif 3844 3845 *lower = lowerdev; 3846 } else { 3847 if (vxlan_addr_multicast(&conf->remote_ip)) { 3848 NL_SET_ERR_MSG(extack, 3849 "Local interface required for multicast remote destination"); 3850 3851 return -EINVAL; 3852 } 3853 3854 #if IS_ENABLED(CONFIG_IPV6) 3855 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) { 3856 NL_SET_ERR_MSG(extack, 3857 "Local interface required for link-local local/remote addresses"); 3858 return -EINVAL; 3859 } 3860 #endif 3861 3862 *lower = NULL; 3863 } 3864 3865 if (!conf->dst_port) { 3866 if (conf->flags & VXLAN_F_GPE) 3867 conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT); 3868 else 3869 conf->dst_port = htons(vxlan_port); 3870 } 3871 3872 if (!conf->age_interval) 3873 conf->age_interval = FDB_AGE_DEFAULT; 3874 3875 if (vxlan_vni_in_use(src_net, old, conf, conf->vni)) { 3876 NL_SET_ERR_MSG(extack, 3877 "A VXLAN device with the specified VNI already exists"); 3878 return -EEXIST; 3879 } 3880 3881 return 0; 3882 } 3883 3884 static void vxlan_config_apply(struct net_device *dev, 3885 struct vxlan_config *conf, 3886 struct net_device *lowerdev, 3887 struct net *src_net, 3888 bool changelink) 3889 { 3890 struct vxlan_dev *vxlan = netdev_priv(dev); 3891 struct vxlan_rdst *dst = &vxlan->default_dst; 3892 unsigned short needed_headroom = ETH_HLEN; 3893 int max_mtu = ETH_MAX_MTU; 3894 u32 flags = conf->flags; 3895 3896 if (!changelink) { 3897 if (flags & VXLAN_F_GPE) 3898 vxlan_raw_setup(dev); 3899 else 3900 vxlan_ether_setup(dev); 3901 3902 if (conf->mtu) 3903 dev->mtu = conf->mtu; 3904 3905 vxlan->net = src_net; 3906 } 3907 3908 dst->remote_vni = conf->vni; 3909 3910 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip)); 3911 3912 if (lowerdev) { 3913 dst->remote_ifindex = conf->remote_ifindex; 3914 3915 netif_inherit_tso_max(dev, lowerdev); 3916 3917 needed_headroom = lowerdev->hard_header_len; 3918 needed_headroom += lowerdev->needed_headroom; 3919 3920 dev->needed_tailroom = lowerdev->needed_tailroom; 3921 3922 max_mtu = lowerdev->mtu - vxlan_headroom(flags); 3923 if (max_mtu < ETH_MIN_MTU) 3924 max_mtu = ETH_MIN_MTU; 3925 3926 if (!changelink && !conf->mtu) 3927 dev->mtu = max_mtu; 3928 } 3929 3930 if (dev->mtu > max_mtu) 3931 dev->mtu = max_mtu; 3932 3933 if (flags & VXLAN_F_COLLECT_METADATA) 3934 flags |= VXLAN_F_IPV6; 3935 needed_headroom += vxlan_headroom(flags); 3936 dev->needed_headroom = needed_headroom; 3937 3938 memcpy(&vxlan->cfg, conf, sizeof(*conf)); 3939 } 3940 3941 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev, 3942 struct vxlan_config *conf, 3943 struct netlink_ext_ack *extack) 3944 { 3945 struct vxlan_dev *vxlan = netdev_priv(dev); 3946 struct net_device *lowerdev; 3947 int ret; 3948 3949 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack); 3950 if (ret) 3951 return ret; 3952 3953 vxlan_config_apply(dev, conf, lowerdev, src_net, false); 3954 3955 return 0; 3956 } 3957 3958 static int __vxlan_dev_create(struct net *net, struct net_device *dev, 3959 struct vxlan_config *conf, 3960 struct netlink_ext_ack *extack) 3961 { 3962 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3963 struct vxlan_dev *vxlan = netdev_priv(dev); 3964 struct net_device *remote_dev = NULL; 3965 struct vxlan_rdst *dst; 3966 int err; 3967 3968 dst = &vxlan->default_dst; 3969 err = vxlan_dev_configure(net, dev, conf, extack); 3970 if (err) 3971 return err; 3972 3973 dev->ethtool_ops = &vxlan_ethtool_ops; 3974 3975 err = register_netdevice(dev); 3976 if (err) 3977 return err; 3978 3979 if (dst->remote_ifindex) { 3980 remote_dev = __dev_get_by_index(net, dst->remote_ifindex); 3981 if (!remote_dev) { 3982 err = -ENODEV; 3983 goto unregister; 3984 } 3985 3986 err = netdev_upper_dev_link(remote_dev, dev, extack); 3987 if (err) 3988 goto unregister; 3989 3990 dst->remote_dev = remote_dev; 3991 } 3992 3993 err = rtnl_configure_link(dev, NULL, 0, NULL); 3994 if (err < 0) 3995 goto unlink; 3996 3997 /* create an fdb entry for a valid default destination */ 3998 if (!vxlan_addr_any(&dst->remote_ip)) { 3999 spin_lock_bh(&vxlan->hash_lock); 4000 err = vxlan_fdb_update(vxlan, all_zeros_mac, 4001 &dst->remote_ip, 4002 NUD_REACHABLE | NUD_PERMANENT, 4003 NLM_F_EXCL | NLM_F_CREATE, 4004 vxlan->cfg.dst_port, 4005 dst->remote_vni, 4006 dst->remote_vni, 4007 dst->remote_ifindex, 4008 NTF_SELF, 0, true, extack); 4009 spin_unlock_bh(&vxlan->hash_lock); 4010 if (err) 4011 goto unlink; 4012 } 4013 4014 list_add(&vxlan->next, &vn->vxlan_list); 4015 4016 return 0; 4017 4018 unlink: 4019 if (remote_dev) 4020 netdev_upper_dev_unlink(remote_dev, dev); 4021 unregister: 4022 unregister_netdevice(dev); 4023 return err; 4024 } 4025 4026 /* Set/clear flags based on attribute */ 4027 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[], 4028 int attrtype, unsigned long mask, bool changelink, 4029 bool changelink_supported, 4030 struct netlink_ext_ack *extack) 4031 { 4032 unsigned long flags; 4033 4034 if (!tb[attrtype]) 4035 return 0; 4036 4037 if (changelink && !changelink_supported) { 4038 vxlan_flag_attr_error(attrtype, extack); 4039 return -EOPNOTSUPP; 4040 } 4041 4042 if (vxlan_policy[attrtype].type == NLA_FLAG) 4043 flags = conf->flags | mask; 4044 else if (nla_get_u8(tb[attrtype])) 4045 flags = conf->flags | mask; 4046 else 4047 flags = conf->flags & ~mask; 4048 4049 conf->flags = flags; 4050 4051 return 0; 4052 } 4053 4054 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[], 4055 struct net_device *dev, struct vxlan_config *conf, 4056 bool changelink, struct netlink_ext_ack *extack) 4057 { 4058 struct vxlanhdr used_bits = { 4059 .vx_flags = VXLAN_HF_VNI, 4060 .vx_vni = VXLAN_VNI_MASK, 4061 }; 4062 struct vxlan_dev *vxlan = netdev_priv(dev); 4063 int err = 0; 4064 4065 memset(conf, 0, sizeof(*conf)); 4066 4067 /* if changelink operation, start with old existing cfg */ 4068 if (changelink) 4069 memcpy(conf, &vxlan->cfg, sizeof(*conf)); 4070 4071 if (data[IFLA_VXLAN_ID]) { 4072 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); 4073 4074 if (changelink && (vni != conf->vni)) { 4075 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI"); 4076 return -EOPNOTSUPP; 4077 } 4078 conf->vni = vni; 4079 } 4080 4081 if (data[IFLA_VXLAN_GROUP]) { 4082 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) { 4083 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group"); 4084 return -EOPNOTSUPP; 4085 } 4086 4087 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]); 4088 conf->remote_ip.sa.sa_family = AF_INET; 4089 } else if (data[IFLA_VXLAN_GROUP6]) { 4090 if (!IS_ENABLED(CONFIG_IPV6)) { 4091 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel"); 4092 return -EPFNOSUPPORT; 4093 } 4094 4095 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) { 4096 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group"); 4097 return -EOPNOTSUPP; 4098 } 4099 4100 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]); 4101 conf->remote_ip.sa.sa_family = AF_INET6; 4102 } 4103 4104 if (data[IFLA_VXLAN_LOCAL]) { 4105 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) { 4106 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old"); 4107 return -EOPNOTSUPP; 4108 } 4109 4110 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]); 4111 conf->saddr.sa.sa_family = AF_INET; 4112 } else if (data[IFLA_VXLAN_LOCAL6]) { 4113 if (!IS_ENABLED(CONFIG_IPV6)) { 4114 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel"); 4115 return -EPFNOSUPPORT; 4116 } 4117 4118 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) { 4119 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old"); 4120 return -EOPNOTSUPP; 4121 } 4122 4123 /* TODO: respect scope id */ 4124 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]); 4125 conf->saddr.sa.sa_family = AF_INET6; 4126 } 4127 4128 if (data[IFLA_VXLAN_LINK]) 4129 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]); 4130 4131 if (data[IFLA_VXLAN_TOS]) 4132 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); 4133 4134 if (data[IFLA_VXLAN_TTL]) 4135 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); 4136 4137 if (data[IFLA_VXLAN_TTL_INHERIT]) { 4138 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT, 4139 VXLAN_F_TTL_INHERIT, changelink, false, 4140 extack); 4141 if (err) 4142 return err; 4143 4144 } 4145 4146 if (data[IFLA_VXLAN_LABEL]) 4147 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) & 4148 IPV6_FLOWLABEL_MASK; 4149 if (data[IFLA_VXLAN_LABEL_POLICY]) 4150 conf->label_policy = nla_get_u32(data[IFLA_VXLAN_LABEL_POLICY]); 4151 4152 if (data[IFLA_VXLAN_LEARNING]) { 4153 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING, 4154 VXLAN_F_LEARN, changelink, true, 4155 extack); 4156 if (err) 4157 return err; 4158 } else if (!changelink) { 4159 /* default to learn on a new device */ 4160 conf->flags |= VXLAN_F_LEARN; 4161 } 4162 4163 if (data[IFLA_VXLAN_AGEING]) 4164 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); 4165 4166 if (data[IFLA_VXLAN_PROXY]) { 4167 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY, 4168 VXLAN_F_PROXY, changelink, false, 4169 extack); 4170 if (err) 4171 return err; 4172 } 4173 4174 if (data[IFLA_VXLAN_RSC]) { 4175 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC, 4176 VXLAN_F_RSC, changelink, false, 4177 extack); 4178 if (err) 4179 return err; 4180 } 4181 4182 if (data[IFLA_VXLAN_L2MISS]) { 4183 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS, 4184 VXLAN_F_L2MISS, changelink, false, 4185 extack); 4186 if (err) 4187 return err; 4188 } 4189 4190 if (data[IFLA_VXLAN_L3MISS]) { 4191 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS, 4192 VXLAN_F_L3MISS, changelink, false, 4193 extack); 4194 if (err) 4195 return err; 4196 } 4197 4198 if (data[IFLA_VXLAN_LIMIT]) { 4199 if (changelink) { 4200 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT], 4201 "Cannot change limit"); 4202 return -EOPNOTSUPP; 4203 } 4204 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); 4205 } 4206 4207 if (data[IFLA_VXLAN_COLLECT_METADATA]) { 4208 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA, 4209 VXLAN_F_COLLECT_METADATA, changelink, false, 4210 extack); 4211 if (err) 4212 return err; 4213 } 4214 4215 if (data[IFLA_VXLAN_PORT_RANGE]) { 4216 if (!changelink) { 4217 const struct ifla_vxlan_port_range *p 4218 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 4219 conf->port_min = ntohs(p->low); 4220 conf->port_max = ntohs(p->high); 4221 } else { 4222 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE], 4223 "Cannot change port range"); 4224 return -EOPNOTSUPP; 4225 } 4226 } 4227 4228 if (data[IFLA_VXLAN_PORT]) { 4229 if (changelink) { 4230 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT], 4231 "Cannot change port"); 4232 return -EOPNOTSUPP; 4233 } 4234 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); 4235 } 4236 4237 if (data[IFLA_VXLAN_UDP_CSUM]) { 4238 if (changelink) { 4239 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM], 4240 "Cannot change UDP_CSUM flag"); 4241 return -EOPNOTSUPP; 4242 } 4243 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM])) 4244 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX; 4245 } 4246 4247 if (data[IFLA_VXLAN_LOCALBYPASS]) { 4248 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LOCALBYPASS, 4249 VXLAN_F_LOCALBYPASS, changelink, 4250 true, extack); 4251 if (err) 4252 return err; 4253 } else if (!changelink) { 4254 /* default to local bypass on a new device */ 4255 conf->flags |= VXLAN_F_LOCALBYPASS; 4256 } 4257 4258 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) { 4259 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4260 VXLAN_F_UDP_ZERO_CSUM6_TX, changelink, 4261 false, extack); 4262 if (err) 4263 return err; 4264 } 4265 4266 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) { 4267 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4268 VXLAN_F_UDP_ZERO_CSUM6_RX, changelink, 4269 false, extack); 4270 if (err) 4271 return err; 4272 } 4273 4274 if (data[IFLA_VXLAN_REMCSUM_TX]) { 4275 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX, 4276 VXLAN_F_REMCSUM_TX, changelink, false, 4277 extack); 4278 if (err) 4279 return err; 4280 } 4281 4282 if (data[IFLA_VXLAN_REMCSUM_RX]) { 4283 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX, 4284 VXLAN_F_REMCSUM_RX, changelink, false, 4285 extack); 4286 if (err) 4287 return err; 4288 used_bits.vx_flags |= VXLAN_HF_RCO; 4289 used_bits.vx_vni |= ~VXLAN_VNI_MASK; 4290 } 4291 4292 if (data[IFLA_VXLAN_GBP]) { 4293 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP, 4294 VXLAN_F_GBP, changelink, false, extack); 4295 if (err) 4296 return err; 4297 used_bits.vx_flags |= VXLAN_GBP_USED_BITS; 4298 } 4299 4300 if (data[IFLA_VXLAN_GPE]) { 4301 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE, 4302 VXLAN_F_GPE, changelink, false, 4303 extack); 4304 if (err) 4305 return err; 4306 4307 used_bits.vx_flags |= VXLAN_GPE_USED_BITS; 4308 } 4309 4310 if (data[IFLA_VXLAN_RESERVED_BITS]) { 4311 struct vxlanhdr reserved_bits; 4312 4313 if (changelink) { 4314 NL_SET_ERR_MSG_ATTR(extack, 4315 data[IFLA_VXLAN_RESERVED_BITS], 4316 "Cannot change reserved_bits"); 4317 return -EOPNOTSUPP; 4318 } 4319 4320 nla_memcpy(&reserved_bits, data[IFLA_VXLAN_RESERVED_BITS], 4321 sizeof(reserved_bits)); 4322 if (used_bits.vx_flags & reserved_bits.vx_flags || 4323 used_bits.vx_vni & reserved_bits.vx_vni) { 4324 __be64 ub_be64, rb_be64; 4325 4326 memcpy(&ub_be64, &used_bits, sizeof(ub_be64)); 4327 memcpy(&rb_be64, &reserved_bits, sizeof(rb_be64)); 4328 4329 NL_SET_ERR_MSG_ATTR_FMT(extack, 4330 data[IFLA_VXLAN_RESERVED_BITS], 4331 "Used bits %#018llx cannot overlap reserved bits %#018llx", 4332 be64_to_cpu(ub_be64), 4333 be64_to_cpu(rb_be64)); 4334 return -EINVAL; 4335 } 4336 4337 conf->reserved_bits = reserved_bits; 4338 } else { 4339 /* For backwards compatibility, only allow reserved fields to be 4340 * used by VXLAN extensions if explicitly requested. 4341 */ 4342 conf->reserved_bits = (struct vxlanhdr) { 4343 .vx_flags = ~used_bits.vx_flags, 4344 .vx_vni = ~used_bits.vx_vni, 4345 }; 4346 } 4347 4348 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) { 4349 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL, 4350 VXLAN_F_REMCSUM_NOPARTIAL, changelink, 4351 false, extack); 4352 if (err) 4353 return err; 4354 } 4355 4356 if (data[IFLA_VXLAN_MC_ROUTE]) { 4357 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_MC_ROUTE, 4358 VXLAN_F_MC_ROUTE, changelink, 4359 true, extack); 4360 if (err) 4361 return err; 4362 } 4363 4364 if (tb[IFLA_MTU]) { 4365 if (changelink) { 4366 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 4367 "Cannot change mtu"); 4368 return -EOPNOTSUPP; 4369 } 4370 conf->mtu = nla_get_u32(tb[IFLA_MTU]); 4371 } 4372 4373 if (data[IFLA_VXLAN_DF]) 4374 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]); 4375 4376 if (data[IFLA_VXLAN_VNIFILTER]) { 4377 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_VNIFILTER, 4378 VXLAN_F_VNIFILTER, changelink, false, 4379 extack); 4380 if (err) 4381 return err; 4382 4383 if ((conf->flags & VXLAN_F_VNIFILTER) && 4384 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 4385 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_VNIFILTER], 4386 "vxlan vnifilter only valid in collect metadata mode"); 4387 return -EINVAL; 4388 } 4389 } 4390 4391 return 0; 4392 } 4393 4394 static int vxlan_newlink(struct net_device *dev, 4395 struct rtnl_newlink_params *params, 4396 struct netlink_ext_ack *extack) 4397 { 4398 struct net *link_net = rtnl_newlink_link_net(params); 4399 struct nlattr **data = params->data; 4400 struct nlattr **tb = params->tb; 4401 struct vxlan_config conf; 4402 int err; 4403 4404 err = vxlan_nl2conf(tb, data, dev, &conf, false, extack); 4405 if (err) 4406 return err; 4407 4408 return __vxlan_dev_create(link_net, dev, &conf, extack); 4409 } 4410 4411 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[], 4412 struct nlattr *data[], 4413 struct netlink_ext_ack *extack) 4414 { 4415 struct vxlan_dev *vxlan = netdev_priv(dev); 4416 bool rem_ip_changed, change_igmp; 4417 struct net_device *lowerdev; 4418 struct vxlan_config conf; 4419 struct vxlan_rdst *dst; 4420 int err; 4421 4422 dst = &vxlan->default_dst; 4423 err = vxlan_nl2conf(tb, data, dev, &conf, true, extack); 4424 if (err) 4425 return err; 4426 4427 err = vxlan_config_validate(vxlan->net, &conf, &lowerdev, 4428 vxlan, extack); 4429 if (err) 4430 return err; 4431 4432 if (dst->remote_dev == lowerdev) 4433 lowerdev = NULL; 4434 4435 err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev, 4436 extack); 4437 if (err) 4438 return err; 4439 4440 rem_ip_changed = !vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip); 4441 change_igmp = vxlan->dev->flags & IFF_UP && 4442 (rem_ip_changed || 4443 dst->remote_ifindex != conf.remote_ifindex); 4444 4445 /* handle default dst entry */ 4446 if (rem_ip_changed) { 4447 spin_lock_bh(&vxlan->hash_lock); 4448 if (!vxlan_addr_any(&conf.remote_ip)) { 4449 err = vxlan_fdb_update(vxlan, all_zeros_mac, 4450 &conf.remote_ip, 4451 NUD_REACHABLE | NUD_PERMANENT, 4452 NLM_F_APPEND | NLM_F_CREATE, 4453 vxlan->cfg.dst_port, 4454 conf.vni, conf.vni, 4455 conf.remote_ifindex, 4456 NTF_SELF, 0, true, extack); 4457 if (err) { 4458 spin_unlock_bh(&vxlan->hash_lock); 4459 netdev_adjacent_change_abort(dst->remote_dev, 4460 lowerdev, dev); 4461 return err; 4462 } 4463 } 4464 if (!vxlan_addr_any(&dst->remote_ip)) 4465 __vxlan_fdb_delete(vxlan, all_zeros_mac, 4466 dst->remote_ip, 4467 vxlan->cfg.dst_port, 4468 dst->remote_vni, 4469 dst->remote_vni, 4470 dst->remote_ifindex, 4471 true); 4472 spin_unlock_bh(&vxlan->hash_lock); 4473 4474 /* If vni filtering device, also update fdb entries of 4475 * all vnis that were using default remote ip 4476 */ 4477 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 4478 err = vxlan_vnilist_update_group(vxlan, &dst->remote_ip, 4479 &conf.remote_ip, extack); 4480 if (err) { 4481 netdev_adjacent_change_abort(dst->remote_dev, 4482 lowerdev, dev); 4483 return err; 4484 } 4485 } 4486 } 4487 4488 if (change_igmp && vxlan_addr_multicast(&dst->remote_ip)) 4489 err = vxlan_multicast_leave(vxlan); 4490 4491 if (conf.age_interval != vxlan->cfg.age_interval) 4492 mod_timer(&vxlan->age_timer, jiffies); 4493 4494 netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev); 4495 if (lowerdev && lowerdev != dst->remote_dev) 4496 dst->remote_dev = lowerdev; 4497 vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true); 4498 4499 if (!err && change_igmp && 4500 vxlan_addr_multicast(&dst->remote_ip)) 4501 err = vxlan_multicast_join(vxlan); 4502 4503 return err; 4504 } 4505 4506 static void vxlan_dellink(struct net_device *dev, struct list_head *head) 4507 { 4508 struct vxlan_dev *vxlan = netdev_priv(dev); 4509 struct vxlan_fdb_flush_desc desc = {}; 4510 4511 vxlan_flush(vxlan, &desc); 4512 4513 list_del(&vxlan->next); 4514 unregister_netdevice_queue(dev, head); 4515 if (vxlan->default_dst.remote_dev) 4516 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev); 4517 } 4518 4519 static size_t vxlan_get_size(const struct net_device *dev) 4520 { 4521 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ 4522 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */ 4523 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ 4524 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */ 4525 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ 4526 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */ 4527 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ 4528 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */ 4529 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */ 4530 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LABEL_POLICY */ 4531 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ 4532 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ 4533 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ 4534 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ 4535 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ 4536 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */ 4537 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ 4538 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ 4539 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */ 4540 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */ 4541 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */ 4542 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */ 4543 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */ 4544 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */ 4545 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LOCALBYPASS */ 4546 /* IFLA_VXLAN_PORT_RANGE */ 4547 nla_total_size(sizeof(struct ifla_vxlan_port_range)) + 4548 nla_total_size(0) + /* IFLA_VXLAN_GBP */ 4549 nla_total_size(0) + /* IFLA_VXLAN_GPE */ 4550 nla_total_size(0) + /* IFLA_VXLAN_REMCSUM_NOPARTIAL */ 4551 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_VNIFILTER */ 4552 /* IFLA_VXLAN_RESERVED_BITS */ 4553 nla_total_size(sizeof(struct vxlanhdr)) + 4554 0; 4555 } 4556 4557 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 4558 { 4559 const struct vxlan_dev *vxlan = netdev_priv(dev); 4560 const struct vxlan_rdst *dst = &vxlan->default_dst; 4561 struct ifla_vxlan_port_range ports = { 4562 .low = htons(vxlan->cfg.port_min), 4563 .high = htons(vxlan->cfg.port_max), 4564 }; 4565 4566 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni))) 4567 goto nla_put_failure; 4568 4569 if (!vxlan_addr_any(&dst->remote_ip)) { 4570 if (dst->remote_ip.sa.sa_family == AF_INET) { 4571 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP, 4572 dst->remote_ip.sin.sin_addr.s_addr)) 4573 goto nla_put_failure; 4574 #if IS_ENABLED(CONFIG_IPV6) 4575 } else { 4576 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6, 4577 &dst->remote_ip.sin6.sin6_addr)) 4578 goto nla_put_failure; 4579 #endif 4580 } 4581 } 4582 4583 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) 4584 goto nla_put_failure; 4585 4586 if (!vxlan_addr_any(&vxlan->cfg.saddr)) { 4587 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) { 4588 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL, 4589 vxlan->cfg.saddr.sin.sin_addr.s_addr)) 4590 goto nla_put_failure; 4591 #if IS_ENABLED(CONFIG_IPV6) 4592 } else { 4593 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6, 4594 &vxlan->cfg.saddr.sin6.sin6_addr)) 4595 goto nla_put_failure; 4596 #endif 4597 } 4598 } 4599 4600 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) || 4601 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT, 4602 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) || 4603 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) || 4604 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) || 4605 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) || 4606 nla_put_u32(skb, IFLA_VXLAN_LABEL_POLICY, vxlan->cfg.label_policy) || 4607 nla_put_u8(skb, IFLA_VXLAN_LEARNING, 4608 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) || 4609 nla_put_u8(skb, IFLA_VXLAN_PROXY, 4610 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) || 4611 nla_put_u8(skb, IFLA_VXLAN_RSC, 4612 !!(vxlan->cfg.flags & VXLAN_F_RSC)) || 4613 nla_put_u8(skb, IFLA_VXLAN_L2MISS, 4614 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) || 4615 nla_put_u8(skb, IFLA_VXLAN_L3MISS, 4616 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) || 4617 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA, 4618 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) || 4619 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) || 4620 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) || 4621 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) || 4622 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM, 4623 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) || 4624 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4625 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) || 4626 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4627 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) || 4628 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX, 4629 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) || 4630 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX, 4631 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)) || 4632 nla_put_u8(skb, IFLA_VXLAN_LOCALBYPASS, 4633 !!(vxlan->cfg.flags & VXLAN_F_LOCALBYPASS))) 4634 goto nla_put_failure; 4635 4636 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) 4637 goto nla_put_failure; 4638 4639 if (vxlan->cfg.flags & VXLAN_F_GBP && 4640 nla_put_flag(skb, IFLA_VXLAN_GBP)) 4641 goto nla_put_failure; 4642 4643 if (vxlan->cfg.flags & VXLAN_F_GPE && 4644 nla_put_flag(skb, IFLA_VXLAN_GPE)) 4645 goto nla_put_failure; 4646 4647 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL && 4648 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL)) 4649 goto nla_put_failure; 4650 4651 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER && 4652 nla_put_u8(skb, IFLA_VXLAN_VNIFILTER, 4653 !!(vxlan->cfg.flags & VXLAN_F_VNIFILTER))) 4654 goto nla_put_failure; 4655 4656 if (nla_put(skb, IFLA_VXLAN_RESERVED_BITS, 4657 sizeof(vxlan->cfg.reserved_bits), 4658 &vxlan->cfg.reserved_bits)) 4659 goto nla_put_failure; 4660 4661 return 0; 4662 4663 nla_put_failure: 4664 return -EMSGSIZE; 4665 } 4666 4667 static struct net *vxlan_get_link_net(const struct net_device *dev) 4668 { 4669 struct vxlan_dev *vxlan = netdev_priv(dev); 4670 4671 return READ_ONCE(vxlan->net); 4672 } 4673 4674 static struct rtnl_link_ops vxlan_link_ops __read_mostly = { 4675 .kind = "vxlan", 4676 .maxtype = IFLA_VXLAN_MAX, 4677 .policy = vxlan_policy, 4678 .priv_size = sizeof(struct vxlan_dev), 4679 .setup = vxlan_setup, 4680 .validate = vxlan_validate, 4681 .newlink = vxlan_newlink, 4682 .changelink = vxlan_changelink, 4683 .dellink = vxlan_dellink, 4684 .get_size = vxlan_get_size, 4685 .fill_info = vxlan_fill_info, 4686 .get_link_net = vxlan_get_link_net, 4687 }; 4688 4689 struct net_device *vxlan_dev_create(struct net *net, const char *name, 4690 u8 name_assign_type, 4691 struct vxlan_config *conf) 4692 { 4693 struct nlattr *tb[IFLA_MAX + 1]; 4694 struct net_device *dev; 4695 int err; 4696 4697 memset(&tb, 0, sizeof(tb)); 4698 4699 dev = rtnl_create_link(net, name, name_assign_type, 4700 &vxlan_link_ops, tb, NULL); 4701 if (IS_ERR(dev)) 4702 return dev; 4703 4704 err = __vxlan_dev_create(net, dev, conf, NULL); 4705 if (err < 0) { 4706 free_netdev(dev); 4707 return ERR_PTR(err); 4708 } 4709 4710 err = rtnl_configure_link(dev, NULL, 0, NULL); 4711 if (err < 0) { 4712 LIST_HEAD(list_kill); 4713 4714 vxlan_dellink(dev, &list_kill); 4715 unregister_netdevice_many(&list_kill); 4716 return ERR_PTR(err); 4717 } 4718 4719 return dev; 4720 } 4721 EXPORT_SYMBOL_GPL(vxlan_dev_create); 4722 4723 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn, 4724 struct net_device *dev) 4725 { 4726 struct vxlan_dev *vxlan, *next; 4727 LIST_HEAD(list_kill); 4728 4729 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) { 4730 struct vxlan_rdst *dst = &vxlan->default_dst; 4731 4732 /* In case we created vxlan device with carrier 4733 * and we loose the carrier due to module unload 4734 * we also need to remove vxlan device. In other 4735 * cases, it's not necessary and remote_ifindex 4736 * is 0 here, so no matches. 4737 */ 4738 if (dst->remote_ifindex == dev->ifindex) 4739 vxlan_dellink(vxlan->dev, &list_kill); 4740 } 4741 4742 unregister_netdevice_many(&list_kill); 4743 } 4744 4745 static int vxlan_netdevice_event(struct notifier_block *unused, 4746 unsigned long event, void *ptr) 4747 { 4748 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 4749 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); 4750 4751 if (event == NETDEV_UNREGISTER) 4752 vxlan_handle_lowerdev_unregister(vn, dev); 4753 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 4754 vxlan_offload_rx_ports(dev, true); 4755 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 4756 vxlan_offload_rx_ports(dev, false); 4757 4758 return NOTIFY_DONE; 4759 } 4760 4761 static struct notifier_block vxlan_notifier_block __read_mostly = { 4762 .notifier_call = vxlan_netdevice_event, 4763 }; 4764 4765 static void 4766 vxlan_fdb_offloaded_set(struct net_device *dev, 4767 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4768 { 4769 struct vxlan_dev *vxlan = netdev_priv(dev); 4770 struct vxlan_rdst *rdst; 4771 struct vxlan_fdb *f; 4772 4773 spin_lock_bh(&vxlan->hash_lock); 4774 4775 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4776 if (!f) 4777 goto out; 4778 4779 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip, 4780 fdb_info->remote_port, 4781 fdb_info->remote_vni, 4782 fdb_info->remote_ifindex); 4783 if (!rdst) 4784 goto out; 4785 4786 rdst->offloaded = fdb_info->offloaded; 4787 4788 out: 4789 spin_unlock_bh(&vxlan->hash_lock); 4790 } 4791 4792 static int 4793 vxlan_fdb_external_learn_add(struct net_device *dev, 4794 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4795 { 4796 struct vxlan_dev *vxlan = netdev_priv(dev); 4797 struct netlink_ext_ack *extack; 4798 int err; 4799 4800 extack = switchdev_notifier_info_to_extack(&fdb_info->info); 4801 4802 spin_lock_bh(&vxlan->hash_lock); 4803 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip, 4804 NUD_REACHABLE, 4805 NLM_F_CREATE | NLM_F_REPLACE, 4806 fdb_info->remote_port, 4807 fdb_info->vni, 4808 fdb_info->remote_vni, 4809 fdb_info->remote_ifindex, 4810 NTF_USE | NTF_SELF | NTF_EXT_LEARNED, 4811 0, false, extack); 4812 spin_unlock_bh(&vxlan->hash_lock); 4813 4814 return err; 4815 } 4816 4817 static int 4818 vxlan_fdb_external_learn_del(struct net_device *dev, 4819 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4820 { 4821 struct vxlan_dev *vxlan = netdev_priv(dev); 4822 struct vxlan_fdb *f; 4823 int err = 0; 4824 4825 spin_lock_bh(&vxlan->hash_lock); 4826 4827 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4828 if (!f) 4829 err = -ENOENT; 4830 else if (f->flags & NTF_EXT_LEARNED) 4831 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr, 4832 fdb_info->remote_ip, 4833 fdb_info->remote_port, 4834 fdb_info->vni, 4835 fdb_info->remote_vni, 4836 fdb_info->remote_ifindex, 4837 false); 4838 4839 spin_unlock_bh(&vxlan->hash_lock); 4840 4841 return err; 4842 } 4843 4844 static int vxlan_switchdev_event(struct notifier_block *unused, 4845 unsigned long event, void *ptr) 4846 { 4847 struct net_device *dev = switchdev_notifier_info_to_dev(ptr); 4848 struct switchdev_notifier_vxlan_fdb_info *fdb_info; 4849 int err = 0; 4850 4851 switch (event) { 4852 case SWITCHDEV_VXLAN_FDB_OFFLOADED: 4853 vxlan_fdb_offloaded_set(dev, ptr); 4854 break; 4855 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE: 4856 fdb_info = ptr; 4857 err = vxlan_fdb_external_learn_add(dev, fdb_info); 4858 if (err) { 4859 err = notifier_from_errno(err); 4860 break; 4861 } 4862 fdb_info->offloaded = true; 4863 vxlan_fdb_offloaded_set(dev, fdb_info); 4864 break; 4865 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE: 4866 fdb_info = ptr; 4867 err = vxlan_fdb_external_learn_del(dev, fdb_info); 4868 if (err) { 4869 err = notifier_from_errno(err); 4870 break; 4871 } 4872 fdb_info->offloaded = false; 4873 vxlan_fdb_offloaded_set(dev, fdb_info); 4874 break; 4875 } 4876 4877 return err; 4878 } 4879 4880 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = { 4881 .notifier_call = vxlan_switchdev_event, 4882 }; 4883 4884 static void vxlan_fdb_nh_flush(struct nexthop *nh) 4885 { 4886 struct vxlan_fdb *fdb; 4887 struct vxlan_dev *vxlan; 4888 4889 rcu_read_lock(); 4890 list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) { 4891 vxlan = rcu_dereference(fdb->vdev); 4892 WARN_ON(!vxlan); 4893 spin_lock_bh(&vxlan->hash_lock); 4894 if (!hlist_unhashed(&fdb->fdb_node)) 4895 vxlan_fdb_destroy(vxlan, fdb, false, false); 4896 spin_unlock_bh(&vxlan->hash_lock); 4897 } 4898 rcu_read_unlock(); 4899 } 4900 4901 static int vxlan_nexthop_event(struct notifier_block *nb, 4902 unsigned long event, void *ptr) 4903 { 4904 struct nh_notifier_info *info = ptr; 4905 struct nexthop *nh; 4906 4907 if (event != NEXTHOP_EVENT_DEL) 4908 return NOTIFY_DONE; 4909 4910 nh = nexthop_find_by_id(info->net, info->id); 4911 if (!nh) 4912 return NOTIFY_DONE; 4913 4914 vxlan_fdb_nh_flush(nh); 4915 4916 return NOTIFY_DONE; 4917 } 4918 4919 static __net_init int vxlan_init_net(struct net *net) 4920 { 4921 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4922 unsigned int h; 4923 4924 INIT_LIST_HEAD(&vn->vxlan_list); 4925 vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event; 4926 4927 for (h = 0; h < PORT_HASH_SIZE; ++h) 4928 INIT_HLIST_HEAD(&vn->sock_list[h]); 4929 4930 return register_nexthop_notifier(net, &vn->nexthop_notifier_block, 4931 NULL); 4932 } 4933 4934 static void __net_exit vxlan_destroy_tunnels(struct vxlan_net *vn, 4935 struct list_head *dev_to_kill) 4936 { 4937 struct vxlan_dev *vxlan, *next; 4938 4939 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) 4940 vxlan_dellink(vxlan->dev, dev_to_kill); 4941 } 4942 4943 static void __net_exit vxlan_exit_rtnl(struct net *net, 4944 struct list_head *dev_to_kill) 4945 { 4946 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4947 4948 ASSERT_RTNL_NET(net); 4949 4950 __unregister_nexthop_notifier(net, &vn->nexthop_notifier_block); 4951 vxlan_destroy_tunnels(vn, dev_to_kill); 4952 } 4953 4954 static void __net_exit vxlan_exit_net(struct net *net) 4955 { 4956 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4957 unsigned int h; 4958 4959 for (h = 0; h < PORT_HASH_SIZE; ++h) 4960 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h])); 4961 } 4962 4963 static struct pernet_operations vxlan_net_ops = { 4964 .init = vxlan_init_net, 4965 .exit_rtnl = vxlan_exit_rtnl, 4966 .exit = vxlan_exit_net, 4967 .id = &vxlan_net_id, 4968 .size = sizeof(struct vxlan_net), 4969 }; 4970 4971 static int __init vxlan_init_module(void) 4972 { 4973 int rc; 4974 4975 rc = register_pernet_subsys(&vxlan_net_ops); 4976 if (rc) 4977 goto out1; 4978 4979 rc = register_netdevice_notifier(&vxlan_notifier_block); 4980 if (rc) 4981 goto out2; 4982 4983 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block); 4984 if (rc) 4985 goto out3; 4986 4987 rc = rtnl_link_register(&vxlan_link_ops); 4988 if (rc) 4989 goto out4; 4990 4991 rc = vxlan_vnifilter_init(); 4992 if (rc) 4993 goto out5; 4994 4995 return 0; 4996 out5: 4997 rtnl_link_unregister(&vxlan_link_ops); 4998 out4: 4999 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 5000 out3: 5001 unregister_netdevice_notifier(&vxlan_notifier_block); 5002 out2: 5003 unregister_pernet_subsys(&vxlan_net_ops); 5004 out1: 5005 return rc; 5006 } 5007 late_initcall(vxlan_init_module); 5008 5009 static void __exit vxlan_cleanup_module(void) 5010 { 5011 vxlan_vnifilter_uninit(); 5012 rtnl_link_unregister(&vxlan_link_ops); 5013 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 5014 unregister_netdevice_notifier(&vxlan_notifier_block); 5015 unregister_pernet_subsys(&vxlan_net_ops); 5016 /* rcu_barrier() is called by netns */ 5017 } 5018 module_exit(vxlan_cleanup_module); 5019 5020 MODULE_LICENSE("GPL"); 5021 MODULE_VERSION(VXLAN_VERSION); 5022 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); 5023 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic"); 5024 MODULE_ALIAS_RTNL_LINK("vxlan"); 5025