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mtd: no need to check return value of debugfs_create functions
[linux/fpc-iii.git] / drivers / net / vxlan.c
blob3d9bcc957f7da15b58aad5d9cb6acdb9803f4553
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 <net/arp.h>
19 #include <net/ndisc.h>
20 #include <net/ipv6_stubs.h>
21 #include <net/ip.h>
22 #include <net/icmp.h>
23 #include <net/rtnetlink.h>
24 #include <net/inet_ecn.h>
25 #include <net/net_namespace.h>
26 #include <net/netns/generic.h>
27 #include <net/tun_proto.h>
28 #include <net/vxlan.h>
29
30 #if IS_ENABLED(CONFIG_IPV6)
31 #include <net/ip6_tunnel.h>
32 #include <net/ip6_checksum.h>
33 #endif
34
35 #define VXLAN_VERSION "0.1"
36
37 #define PORT_HASH_BITS 8
38 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
39 #define FDB_AGE_DEFAULT 300 /* 5 min */
40 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
41
42 /* UDP port for VXLAN traffic.
43 * The IANA assigned port is 4789, but the Linux default is 8472
44 * for compatibility with early adopters.
45 */
46 static unsigned short vxlan_port __read_mostly = 8472;
47 module_param_named(udp_port, vxlan_port, ushort, 0444);
48 MODULE_PARM_DESC(udp_port, "Destination UDP port");
49
50 static bool log_ecn_error = true;
51 module_param(log_ecn_error, bool, 0644);
52 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
53
54 static unsigned int vxlan_net_id;
55 static struct rtnl_link_ops vxlan_link_ops;
56
57 static const u8 all_zeros_mac[ETH_ALEN + 2];
58
59 static int vxlan_sock_add(struct vxlan_dev *vxlan);
60
61 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
62
63 /* per-network namespace private data for this module */
64 struct vxlan_net {
65 struct list_head vxlan_list;
66 struct hlist_head sock_list[PORT_HASH_SIZE];
67 spinlock_t sock_lock;
68 };
69
70 /* Forwarding table entry */
71 struct vxlan_fdb {
72 struct hlist_node hlist; /* linked list of entries */
73 struct rcu_head rcu;
74 unsigned long updated; /* jiffies */
75 unsigned long used;
76 struct list_head remotes;
77 u8 eth_addr[ETH_ALEN];
78 u16 state; /* see ndm_state */
79 __be32 vni;
80 u16 flags; /* see ndm_flags and below */
81 };
82
83 #define NTF_VXLAN_ADDED_BY_USER 0x100
84
85 /* salt for hash table */
86 static u32 vxlan_salt __read_mostly;
87
88 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
89 {
90 return vs->flags & VXLAN_F_COLLECT_METADATA ||
91 ip_tunnel_collect_metadata();
92 }
93
94 #if IS_ENABLED(CONFIG_IPV6)
95 static inline
96 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
97 {
98 if (a->sa.sa_family != b->sa.sa_family)
99 return false;
100 if (a->sa.sa_family == AF_INET6)
101 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
102 else
103 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
104 }
105
106 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
107 {
108 if (nla_len(nla) >= sizeof(struct in6_addr)) {
109 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
110 ip->sa.sa_family = AF_INET6;
111 return 0;
112 } else if (nla_len(nla) >= sizeof(__be32)) {
113 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
114 ip->sa.sa_family = AF_INET;
115 return 0;
116 } else {
117 return -EAFNOSUPPORT;
118 }
119 }
120
121 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
122 const union vxlan_addr *ip)
123 {
124 if (ip->sa.sa_family == AF_INET6)
125 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
126 else
127 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
128 }
129
130 #else /* !CONFIG_IPV6 */
131
132 static inline
133 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
134 {
135 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
136 }
137
138 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
139 {
140 if (nla_len(nla) >= sizeof(struct in6_addr)) {
141 return -EAFNOSUPPORT;
142 } else if (nla_len(nla) >= sizeof(__be32)) {
143 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
144 ip->sa.sa_family = AF_INET;
145 return 0;
146 } else {
147 return -EAFNOSUPPORT;
148 }
149 }
150
151 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
152 const union vxlan_addr *ip)
153 {
154 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
155 }
156 #endif
157
158 /* Virtual Network hash table head */
159 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
160 {
161 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
162 }
163
164 /* Socket hash table head */
165 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
166 {
167 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
168
169 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
170 }
171
172 /* First remote destination for a forwarding entry.
173 * Guaranteed to be non-NULL because remotes are never deleted.
174 */
175 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
176 {
177 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
178 }
179
180 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
181 {
182 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
183 }
184
185 /* Find VXLAN socket based on network namespace, address family and UDP port
186 * and enabled unshareable flags.
187 */
188 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
189 __be16 port, u32 flags, int ifindex)
190 {
191 struct vxlan_sock *vs;
192
193 flags &= VXLAN_F_RCV_FLAGS;
194
195 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
196 if (inet_sk(vs->sock->sk)->inet_sport == port &&
197 vxlan_get_sk_family(vs) == family &&
198 vs->flags == flags &&
199 vs->sock->sk->sk_bound_dev_if == ifindex)
200 return vs;
201 }
202 return NULL;
203 }
204
205 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
206 __be32 vni)
207 {
208 struct vxlan_dev_node *node;
209
210 /* For flow based devices, map all packets to VNI 0 */
211 if (vs->flags & VXLAN_F_COLLECT_METADATA)
212 vni = 0;
213
214 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
215 if (node->vxlan->default_dst.remote_vni != vni)
216 continue;
217
218 if (IS_ENABLED(CONFIG_IPV6)) {
219 const struct vxlan_config *cfg = &node->vxlan->cfg;
220
221 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
222 cfg->remote_ifindex != ifindex)
223 continue;
224 }
225
226 return node->vxlan;
227 }
228
229 return NULL;
230 }
231
232 /* Look up VNI in a per net namespace table */
233 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
234 __be32 vni, sa_family_t family,
235 __be16 port, u32 flags)
236 {
237 struct vxlan_sock *vs;
238
239 vs = vxlan_find_sock(net, family, port, flags, ifindex);
240 if (!vs)
241 return NULL;
242
243 return vxlan_vs_find_vni(vs, ifindex, vni);
244 }
245
246 /* Fill in neighbour message in skbuff. */
247 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
248 const struct vxlan_fdb *fdb,
249 u32 portid, u32 seq, int type, unsigned int flags,
250 const struct vxlan_rdst *rdst)
251 {
252 unsigned long now = jiffies;
253 struct nda_cacheinfo ci;
254 struct nlmsghdr *nlh;
255 struct ndmsg *ndm;
256 bool send_ip, send_eth;
257
258 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
259 if (nlh == NULL)
260 return -EMSGSIZE;
261
262 ndm = nlmsg_data(nlh);
263 memset(ndm, 0, sizeof(*ndm));
264
265 send_eth = send_ip = true;
266
267 if (type == RTM_GETNEIGH) {
268 send_ip = !vxlan_addr_any(&rdst->remote_ip);
269 send_eth = !is_zero_ether_addr(fdb->eth_addr);
270 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
271 } else
272 ndm->ndm_family = AF_BRIDGE;
273 ndm->ndm_state = fdb->state;
274 ndm->ndm_ifindex = vxlan->dev->ifindex;
275 ndm->ndm_flags = fdb->flags;
276 if (rdst->offloaded)
277 ndm->ndm_flags |= NTF_OFFLOADED;
278 ndm->ndm_type = RTN_UNICAST;
279
280 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
281 nla_put_s32(skb, NDA_LINK_NETNSID,
282 peernet2id(dev_net(vxlan->dev), vxlan->net)))
283 goto nla_put_failure;
284
285 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
286 goto nla_put_failure;
287
288 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
289 goto nla_put_failure;
290
291 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
292 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
293 goto nla_put_failure;
294 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
295 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
296 goto nla_put_failure;
297 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
298 nla_put_u32(skb, NDA_SRC_VNI,
299 be32_to_cpu(fdb->vni)))
300 goto nla_put_failure;
301 if (rdst->remote_ifindex &&
302 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
303 goto nla_put_failure;
304
305 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
306 ci.ndm_confirmed = 0;
307 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
308 ci.ndm_refcnt = 0;
309
310 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
311 goto nla_put_failure;
312
313 nlmsg_end(skb, nlh);
314 return 0;
315
316 nla_put_failure:
317 nlmsg_cancel(skb, nlh);
318 return -EMSGSIZE;
319 }
320
321 static inline size_t vxlan_nlmsg_size(void)
322 {
323 return NLMSG_ALIGN(sizeof(struct ndmsg))
324 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
325 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
326 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
327 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
328 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
329 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
330 + nla_total_size(sizeof(struct nda_cacheinfo));
331 }
332
333 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
334 struct vxlan_rdst *rd, int type)
335 {
336 struct net *net = dev_net(vxlan->dev);
337 struct sk_buff *skb;
338 int err = -ENOBUFS;
339
340 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
341 if (skb == NULL)
342 goto errout;
343
344 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
345 if (err < 0) {
346 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
347 WARN_ON(err == -EMSGSIZE);
348 kfree_skb(skb);
349 goto errout;
350 }
351
352 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
353 return;
354 errout:
355 if (err < 0)
356 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
357 }
358
359 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
360 const struct vxlan_fdb *fdb,
361 const struct vxlan_rdst *rd,
362 struct netlink_ext_ack *extack,
363 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
364 {
365 fdb_info->info.dev = vxlan->dev;
366 fdb_info->info.extack = extack;
367 fdb_info->remote_ip = rd->remote_ip;
368 fdb_info->remote_port = rd->remote_port;
369 fdb_info->remote_vni = rd->remote_vni;
370 fdb_info->remote_ifindex = rd->remote_ifindex;
371 memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
372 fdb_info->vni = fdb->vni;
373 fdb_info->offloaded = rd->offloaded;
374 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
375 }
376
377 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
378 struct vxlan_fdb *fdb,
379 struct vxlan_rdst *rd,
380 bool adding,
381 struct netlink_ext_ack *extack)
382 {
383 struct switchdev_notifier_vxlan_fdb_info info;
384 enum switchdev_notifier_type notifier_type;
385 int ret;
386
387 if (WARN_ON(!rd))
388 return 0;
389
390 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
391 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
392 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
393 ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
394 &info.info, extack);
395 return notifier_to_errno(ret);
396 }
397
398 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
399 struct vxlan_rdst *rd, int type, bool swdev_notify,
400 struct netlink_ext_ack *extack)
401 {
402 int err;
403
404 if (swdev_notify) {
405 switch (type) {
406 case RTM_NEWNEIGH:
407 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
408 true, extack);
409 if (err)
410 return err;
411 break;
412 case RTM_DELNEIGH:
413 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
414 false, extack);
415 break;
416 }
417 }
418
419 __vxlan_fdb_notify(vxlan, fdb, rd, type);
420 return 0;
421 }
422
423 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
424 {
425 struct vxlan_dev *vxlan = netdev_priv(dev);
426 struct vxlan_fdb f = {
427 .state = NUD_STALE,
428 };
429 struct vxlan_rdst remote = {
430 .remote_ip = *ipa, /* goes to NDA_DST */
431 .remote_vni = cpu_to_be32(VXLAN_N_VID),
432 };
433
434 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
435 }
436
437 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
438 {
439 struct vxlan_fdb f = {
440 .state = NUD_STALE,
441 };
442 struct vxlan_rdst remote = { };
443
444 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
445
446 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
447 }
448
449 /* Hash Ethernet address */
450 static u32 eth_hash(const unsigned char *addr)
451 {
452 u64 value = get_unaligned((u64 *)addr);
453
454 /* only want 6 bytes */
455 #ifdef __BIG_ENDIAN
456 value >>= 16;
457 #else
458 value <<= 16;
459 #endif
460 return hash_64(value, FDB_HASH_BITS);
461 }
462
463 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
464 {
465 /* use 1 byte of OUI and 3 bytes of NIC */
466 u32 key = get_unaligned((u32 *)(addr + 2));
467
468 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
469 }
470
471 static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
472 {
473 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
474 return eth_vni_hash(mac, vni);
475 else
476 return eth_hash(mac);
477 }
478
479 /* Hash chain to use given mac address */
480 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
481 const u8 *mac, __be32 vni)
482 {
483 return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
484 }
485
486 /* Look up Ethernet address in forwarding table */
487 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
488 const u8 *mac, __be32 vni)
489 {
490 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
491 struct vxlan_fdb *f;
492
493 hlist_for_each_entry_rcu(f, head, hlist) {
494 if (ether_addr_equal(mac, f->eth_addr)) {
495 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
496 if (vni == f->vni)
497 return f;
498 } else {
499 return f;
500 }
501 }
502 }
503
504 return NULL;
505 }
506
507 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
508 const u8 *mac, __be32 vni)
509 {
510 struct vxlan_fdb *f;
511
512 f = __vxlan_find_mac(vxlan, mac, vni);
513 if (f && f->used != jiffies)
514 f->used = jiffies;
515
516 return f;
517 }
518
519 /* caller should hold vxlan->hash_lock */
520 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
521 union vxlan_addr *ip, __be16 port,
522 __be32 vni, __u32 ifindex)
523 {
524 struct vxlan_rdst *rd;
525
526 list_for_each_entry(rd, &f->remotes, list) {
527 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
528 rd->remote_port == port &&
529 rd->remote_vni == vni &&
530 rd->remote_ifindex == ifindex)
531 return rd;
532 }
533
534 return NULL;
535 }
536
537 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
538 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
539 {
540 struct vxlan_dev *vxlan = netdev_priv(dev);
541 u8 eth_addr[ETH_ALEN + 2] = { 0 };
542 struct vxlan_rdst *rdst;
543 struct vxlan_fdb *f;
544 int rc = 0;
545
546 if (is_multicast_ether_addr(mac) ||
547 is_zero_ether_addr(mac))
548 return -EINVAL;
549
550 ether_addr_copy(eth_addr, mac);
551
552 rcu_read_lock();
553
554 f = __vxlan_find_mac(vxlan, eth_addr, vni);
555 if (!f) {
556 rc = -ENOENT;
557 goto out;
558 }
559
560 rdst = first_remote_rcu(f);
561 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
562
563 out:
564 rcu_read_unlock();
565 return rc;
566 }
567 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
568
569 static int vxlan_fdb_notify_one(struct notifier_block *nb,
570 const struct vxlan_dev *vxlan,
571 const struct vxlan_fdb *f,
572 const struct vxlan_rdst *rdst,
573 struct netlink_ext_ack *extack)
574 {
575 struct switchdev_notifier_vxlan_fdb_info fdb_info;
576 int rc;
577
578 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
579 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
580 &fdb_info);
581 return notifier_to_errno(rc);
582 }
583
584 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
585 struct notifier_block *nb,
586 struct netlink_ext_ack *extack)
587 {
588 struct vxlan_dev *vxlan;
589 struct vxlan_rdst *rdst;
590 struct vxlan_fdb *f;
591 unsigned int h;
592 int rc = 0;
593
594 if (!netif_is_vxlan(dev))
595 return -EINVAL;
596 vxlan = netdev_priv(dev);
597
598 for (h = 0; h < FDB_HASH_SIZE; ++h) {
599 spin_lock_bh(&vxlan->hash_lock[h]);
600 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
601 if (f->vni == vni) {
602 list_for_each_entry(rdst, &f->remotes, list) {
603 rc = vxlan_fdb_notify_one(nb, vxlan,
604 f, rdst,
605 extack);
606 if (rc)
607 goto unlock;
608 }
609 }
610 }
611 spin_unlock_bh(&vxlan->hash_lock[h]);
612 }
613 return 0;
614
615 unlock:
616 spin_unlock_bh(&vxlan->hash_lock[h]);
617 return rc;
618 }
619 EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
620
621 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
622 {
623 struct vxlan_dev *vxlan;
624 struct vxlan_rdst *rdst;
625 struct vxlan_fdb *f;
626 unsigned int h;
627
628 if (!netif_is_vxlan(dev))
629 return;
630 vxlan = netdev_priv(dev);
631
632 for (h = 0; h < FDB_HASH_SIZE; ++h) {
633 spin_lock_bh(&vxlan->hash_lock[h]);
634 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
635 if (f->vni == vni)
636 list_for_each_entry(rdst, &f->remotes, list)
637 rdst->offloaded = false;
638 spin_unlock_bh(&vxlan->hash_lock[h]);
639 }
640
641 }
642 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
643
644 /* Replace destination of unicast mac */
645 static int vxlan_fdb_replace(struct vxlan_fdb *f,
646 union vxlan_addr *ip, __be16 port, __be32 vni,
647 __u32 ifindex, struct vxlan_rdst *oldrd)
648 {
649 struct vxlan_rdst *rd;
650
651 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
652 if (rd)
653 return 0;
654
655 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
656 if (!rd)
657 return 0;
658
659 *oldrd = *rd;
660 dst_cache_reset(&rd->dst_cache);
661 rd->remote_ip = *ip;
662 rd->remote_port = port;
663 rd->remote_vni = vni;
664 rd->remote_ifindex = ifindex;
665 rd->offloaded = false;
666 return 1;
667 }
668
669 /* Add/update destinations for multicast */
670 static int vxlan_fdb_append(struct vxlan_fdb *f,
671 union vxlan_addr *ip, __be16 port, __be32 vni,
672 __u32 ifindex, struct vxlan_rdst **rdp)
673 {
674 struct vxlan_rdst *rd;
675
676 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
677 if (rd)
678 return 0;
679
680 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
681 if (rd == NULL)
682 return -ENOBUFS;
683
684 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
685 kfree(rd);
686 return -ENOBUFS;
687 }
688
689 rd->remote_ip = *ip;
690 rd->remote_port = port;
691 rd->offloaded = false;
692 rd->remote_vni = vni;
693 rd->remote_ifindex = ifindex;
694
695 list_add_tail_rcu(&rd->list, &f->remotes);
696
697 *rdp = rd;
698 return 1;
699 }
700
701 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
702 unsigned int off,
703 struct vxlanhdr *vh, size_t hdrlen,
704 __be32 vni_field,
705 struct gro_remcsum *grc,
706 bool nopartial)
707 {
708 size_t start, offset;
709
710 if (skb->remcsum_offload)
711 return vh;
712
713 if (!NAPI_GRO_CB(skb)->csum_valid)
714 return NULL;
715
716 start = vxlan_rco_start(vni_field);
717 offset = start + vxlan_rco_offset(vni_field);
718
719 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
720 start, offset, grc, nopartial);
721
722 skb->remcsum_offload = 1;
723
724 return vh;
725 }
726
727 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
728 struct list_head *head,
729 struct sk_buff *skb)
730 {
731 struct sk_buff *pp = NULL;
732 struct sk_buff *p;
733 struct vxlanhdr *vh, *vh2;
734 unsigned int hlen, off_vx;
735 int flush = 1;
736 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
737 __be32 flags;
738 struct gro_remcsum grc;
739
740 skb_gro_remcsum_init(&grc);
741
742 off_vx = skb_gro_offset(skb);
743 hlen = off_vx + sizeof(*vh);
744 vh = skb_gro_header_fast(skb, off_vx);
745 if (skb_gro_header_hard(skb, hlen)) {
746 vh = skb_gro_header_slow(skb, hlen, off_vx);
747 if (unlikely(!vh))
748 goto out;
749 }
750
751 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
752
753 flags = vh->vx_flags;
754
755 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
756 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
757 vh->vx_vni, &grc,
758 !!(vs->flags &
759 VXLAN_F_REMCSUM_NOPARTIAL));
760
761 if (!vh)
762 goto out;
763 }
764
765 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
766
767 list_for_each_entry(p, head, list) {
768 if (!NAPI_GRO_CB(p)->same_flow)
769 continue;
770
771 vh2 = (struct vxlanhdr *)(p->data + off_vx);
772 if (vh->vx_flags != vh2->vx_flags ||
773 vh->vx_vni != vh2->vx_vni) {
774 NAPI_GRO_CB(p)->same_flow = 0;
775 continue;
776 }
777 }
778
779 pp = call_gro_receive(eth_gro_receive, head, skb);
780 flush = 0;
781
782 out:
783 skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
784
785 return pp;
786 }
787
788 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
789 {
790 /* Sets 'skb->inner_mac_header' since we are always called with
791 * 'skb->encapsulation' set.
792 */
793 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
794 }
795
796 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan,
797 const u8 *mac, __u16 state,
798 __be32 src_vni, __u16 ndm_flags)
799 {
800 struct vxlan_fdb *f;
801
802 f = kmalloc(sizeof(*f), GFP_ATOMIC);
803 if (!f)
804 return NULL;
805 f->state = state;
806 f->flags = ndm_flags;
807 f->updated = f->used = jiffies;
808 f->vni = src_vni;
809 INIT_LIST_HEAD(&f->remotes);
810 memcpy(f->eth_addr, mac, ETH_ALEN);
811
812 return f;
813 }
814
815 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
816 __be32 src_vni, struct vxlan_fdb *f)
817 {
818 ++vxlan->addrcnt;
819 hlist_add_head_rcu(&f->hlist,
820 vxlan_fdb_head(vxlan, mac, src_vni));
821 }
822
823 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
824 const u8 *mac, union vxlan_addr *ip,
825 __u16 state, __be16 port, __be32 src_vni,
826 __be32 vni, __u32 ifindex, __u16 ndm_flags,
827 struct vxlan_fdb **fdb)
828 {
829 struct vxlan_rdst *rd = NULL;
830 struct vxlan_fdb *f;
831 int rc;
832
833 if (vxlan->cfg.addrmax &&
834 vxlan->addrcnt >= vxlan->cfg.addrmax)
835 return -ENOSPC;
836
837 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
838 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
839 if (!f)
840 return -ENOMEM;
841
842 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
843 if (rc < 0) {
844 kfree(f);
845 return rc;
846 }
847
848 *fdb = f;
849
850 return 0;
851 }
852
853 static void __vxlan_fdb_free(struct vxlan_fdb *f)
854 {
855 struct vxlan_rdst *rd, *nd;
856
857 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
858 dst_cache_destroy(&rd->dst_cache);
859 kfree(rd);
860 }
861 kfree(f);
862 }
863
864 static void vxlan_fdb_free(struct rcu_head *head)
865 {
866 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
867
868 __vxlan_fdb_free(f);
869 }
870
871 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
872 bool do_notify, bool swdev_notify)
873 {
874 struct vxlan_rdst *rd;
875
876 netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
877
878 --vxlan->addrcnt;
879 if (do_notify)
880 list_for_each_entry(rd, &f->remotes, list)
881 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
882 swdev_notify, NULL);
883
884 hlist_del_rcu(&f->hlist);
885 call_rcu(&f->rcu, vxlan_fdb_free);
886 }
887
888 static void vxlan_dst_free(struct rcu_head *head)
889 {
890 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
891
892 dst_cache_destroy(&rd->dst_cache);
893 kfree(rd);
894 }
895
896 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
897 union vxlan_addr *ip,
898 __u16 state, __u16 flags,
899 __be16 port, __be32 vni,
900 __u32 ifindex, __u16 ndm_flags,
901 struct vxlan_fdb *f,
902 bool swdev_notify,
903 struct netlink_ext_ack *extack)
904 {
905 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
906 struct vxlan_rdst *rd = NULL;
907 struct vxlan_rdst oldrd;
908 int notify = 0;
909 int rc = 0;
910 int err;
911
912 /* Do not allow an externally learned entry to take over an entry added
913 * by the user.
914 */
915 if (!(fdb_flags & NTF_EXT_LEARNED) ||
916 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
917 if (f->state != state) {
918 f->state = state;
919 f->updated = jiffies;
920 notify = 1;
921 }
922 if (f->flags != fdb_flags) {
923 f->flags = fdb_flags;
924 f->updated = jiffies;
925 notify = 1;
926 }
927 }
928
929 if ((flags & NLM_F_REPLACE)) {
930 /* Only change unicasts */
931 if (!(is_multicast_ether_addr(f->eth_addr) ||
932 is_zero_ether_addr(f->eth_addr))) {
933 rc = vxlan_fdb_replace(f, ip, port, vni,
934 ifindex, &oldrd);
935 notify |= rc;
936 } else {
937 return -EOPNOTSUPP;
938 }
939 }
940 if ((flags & NLM_F_APPEND) &&
941 (is_multicast_ether_addr(f->eth_addr) ||
942 is_zero_ether_addr(f->eth_addr))) {
943 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
944
945 if (rc < 0)
946 return rc;
947 notify |= rc;
948 }
949
950 if (ndm_flags & NTF_USE)
951 f->used = jiffies;
952
953 if (notify) {
954 if (rd == NULL)
955 rd = first_remote_rtnl(f);
956
957 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
958 swdev_notify, extack);
959 if (err)
960 goto err_notify;
961 }
962
963 return 0;
964
965 err_notify:
966 if ((flags & NLM_F_REPLACE) && rc)
967 *rd = oldrd;
968 else if ((flags & NLM_F_APPEND) && rc) {
969 list_del_rcu(&rd->list);
970 call_rcu(&rd->rcu, vxlan_dst_free);
971 }
972 return err;
973 }
974
975 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
976 const u8 *mac, union vxlan_addr *ip,
977 __u16 state, __u16 flags,
978 __be16 port, __be32 src_vni, __be32 vni,
979 __u32 ifindex, __u16 ndm_flags,
980 bool swdev_notify,
981 struct netlink_ext_ack *extack)
982 {
983 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
984 struct vxlan_fdb *f;
985 int rc;
986
987 /* Disallow replace to add a multicast entry */
988 if ((flags & NLM_F_REPLACE) &&
989 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
990 return -EOPNOTSUPP;
991
992 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
993 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
994 vni, ifindex, fdb_flags, &f);
995 if (rc < 0)
996 return rc;
997
998 vxlan_fdb_insert(vxlan, mac, src_vni, f);
999 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
1000 swdev_notify, extack);
1001 if (rc)
1002 goto err_notify;
1003
1004 return 0;
1005
1006 err_notify:
1007 vxlan_fdb_destroy(vxlan, f, false, false);
1008 return rc;
1009 }
1010
1011 /* Add new entry to forwarding table -- assumes lock held */
1012 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
1013 const u8 *mac, union vxlan_addr *ip,
1014 __u16 state, __u16 flags,
1015 __be16 port, __be32 src_vni, __be32 vni,
1016 __u32 ifindex, __u16 ndm_flags,
1017 bool swdev_notify,
1018 struct netlink_ext_ack *extack)
1019 {
1020 struct vxlan_fdb *f;
1021
1022 f = __vxlan_find_mac(vxlan, mac, src_vni);
1023 if (f) {
1024 if (flags & NLM_F_EXCL) {
1025 netdev_dbg(vxlan->dev,
1026 "lost race to create %pM\n", mac);
1027 return -EEXIST;
1028 }
1029
1030 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1031 vni, ifindex, ndm_flags, f,
1032 swdev_notify, extack);
1033 } else {
1034 if (!(flags & NLM_F_CREATE))
1035 return -ENOENT;
1036
1037 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1038 port, src_vni, vni, ifindex,
1039 ndm_flags, swdev_notify, extack);
1040 }
1041 }
1042
1043 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1044 struct vxlan_rdst *rd, bool swdev_notify)
1045 {
1046 list_del_rcu(&rd->list);
1047 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1048 call_rcu(&rd->rcu, vxlan_dst_free);
1049 }
1050
1051 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1052 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1053 __be32 *vni, u32 *ifindex)
1054 {
1055 struct net *net = dev_net(vxlan->dev);
1056 int err;
1057
1058 if (tb[NDA_DST]) {
1059 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1060 if (err)
1061 return err;
1062 } else {
1063 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1064 if (remote->sa.sa_family == AF_INET) {
1065 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1066 ip->sa.sa_family = AF_INET;
1067 #if IS_ENABLED(CONFIG_IPV6)
1068 } else {
1069 ip->sin6.sin6_addr = in6addr_any;
1070 ip->sa.sa_family = AF_INET6;
1071 #endif
1072 }
1073 }
1074
1075 if (tb[NDA_PORT]) {
1076 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
1077 return -EINVAL;
1078 *port = nla_get_be16(tb[NDA_PORT]);
1079 } else {
1080 *port = vxlan->cfg.dst_port;
1081 }
1082
1083 if (tb[NDA_VNI]) {
1084 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
1085 return -EINVAL;
1086 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1087 } else {
1088 *vni = vxlan->default_dst.remote_vni;
1089 }
1090
1091 if (tb[NDA_SRC_VNI]) {
1092 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
1093 return -EINVAL;
1094 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1095 } else {
1096 *src_vni = vxlan->default_dst.remote_vni;
1097 }
1098
1099 if (tb[NDA_IFINDEX]) {
1100 struct net_device *tdev;
1101
1102 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
1103 return -EINVAL;
1104 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1105 tdev = __dev_get_by_index(net, *ifindex);
1106 if (!tdev)
1107 return -EADDRNOTAVAIL;
1108 } else {
1109 *ifindex = 0;
1110 }
1111
1112 return 0;
1113 }
1114
1115 /* Add static entry (via netlink) */
1116 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1117 struct net_device *dev,
1118 const unsigned char *addr, u16 vid, u16 flags,
1119 struct netlink_ext_ack *extack)
1120 {
1121 struct vxlan_dev *vxlan = netdev_priv(dev);
1122 /* struct net *net = dev_net(vxlan->dev); */
1123 union vxlan_addr ip;
1124 __be16 port;
1125 __be32 src_vni, vni;
1126 u32 ifindex;
1127 u32 hash_index;
1128 int err;
1129
1130 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1131 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1132 ndm->ndm_state);
1133 return -EINVAL;
1134 }
1135
1136 if (tb[NDA_DST] == NULL)
1137 return -EINVAL;
1138
1139 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1140 if (err)
1141 return err;
1142
1143 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1144 return -EAFNOSUPPORT;
1145
1146 hash_index = fdb_head_index(vxlan, addr, src_vni);
1147 spin_lock_bh(&vxlan->hash_lock[hash_index]);
1148 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1149 port, src_vni, vni, ifindex,
1150 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1151 true, extack);
1152 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1153
1154 return err;
1155 }
1156
1157 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1158 const unsigned char *addr, union vxlan_addr ip,
1159 __be16 port, __be32 src_vni, __be32 vni,
1160 u32 ifindex, bool swdev_notify)
1161 {
1162 struct vxlan_fdb *f;
1163 struct vxlan_rdst *rd = NULL;
1164 int err = -ENOENT;
1165
1166 f = vxlan_find_mac(vxlan, addr, src_vni);
1167 if (!f)
1168 return err;
1169
1170 if (!vxlan_addr_any(&ip)) {
1171 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1172 if (!rd)
1173 goto out;
1174 }
1175
1176 /* remove a destination if it's not the only one on the list,
1177 * otherwise destroy the fdb entry
1178 */
1179 if (rd && !list_is_singular(&f->remotes)) {
1180 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1181 goto out;
1182 }
1183
1184 vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1185
1186 out:
1187 return 0;
1188 }
1189
1190 /* Delete entry (via netlink) */
1191 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1192 struct net_device *dev,
1193 const unsigned char *addr, u16 vid)
1194 {
1195 struct vxlan_dev *vxlan = netdev_priv(dev);
1196 union vxlan_addr ip;
1197 __be32 src_vni, vni;
1198 __be16 port;
1199 u32 ifindex;
1200 u32 hash_index;
1201 int err;
1202
1203 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1204 if (err)
1205 return err;
1206
1207 hash_index = fdb_head_index(vxlan, addr, src_vni);
1208 spin_lock_bh(&vxlan->hash_lock[hash_index]);
1209 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1210 true);
1211 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1212
1213 return err;
1214 }
1215
1216 /* Dump forwarding table */
1217 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1218 struct net_device *dev,
1219 struct net_device *filter_dev, int *idx)
1220 {
1221 struct vxlan_dev *vxlan = netdev_priv(dev);
1222 unsigned int h;
1223 int err = 0;
1224
1225 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1226 struct vxlan_fdb *f;
1227
1228 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1229 struct vxlan_rdst *rd;
1230
1231 list_for_each_entry_rcu(rd, &f->remotes, list) {
1232 if (*idx < cb->args[2])
1233 goto skip;
1234
1235 err = vxlan_fdb_info(skb, vxlan, f,
1236 NETLINK_CB(cb->skb).portid,
1237 cb->nlh->nlmsg_seq,
1238 RTM_NEWNEIGH,
1239 NLM_F_MULTI, rd);
1240 if (err < 0)
1241 goto out;
1242 skip:
1243 *idx += 1;
1244 }
1245 }
1246 }
1247 out:
1248 return err;
1249 }
1250
1251 static int vxlan_fdb_get(struct sk_buff *skb,
1252 struct nlattr *tb[],
1253 struct net_device *dev,
1254 const unsigned char *addr,
1255 u16 vid, u32 portid, u32 seq,
1256 struct netlink_ext_ack *extack)
1257 {
1258 struct vxlan_dev *vxlan = netdev_priv(dev);
1259 struct vxlan_fdb *f;
1260 __be32 vni;
1261 int err;
1262
1263 if (tb[NDA_VNI])
1264 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1265 else
1266 vni = vxlan->default_dst.remote_vni;
1267
1268 rcu_read_lock();
1269
1270 f = __vxlan_find_mac(vxlan, addr, vni);
1271 if (!f) {
1272 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1273 err = -ENOENT;
1274 goto errout;
1275 }
1276
1277 err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1278 RTM_NEWNEIGH, 0, first_remote_rcu(f));
1279 errout:
1280 rcu_read_unlock();
1281 return err;
1282 }
1283
1284 /* Watch incoming packets to learn mapping between Ethernet address
1285 * and Tunnel endpoint.
1286 * Return true if packet is bogus and should be dropped.
1287 */
1288 static bool vxlan_snoop(struct net_device *dev,
1289 union vxlan_addr *src_ip, const u8 *src_mac,
1290 u32 src_ifindex, __be32 vni)
1291 {
1292 struct vxlan_dev *vxlan = netdev_priv(dev);
1293 struct vxlan_fdb *f;
1294 u32 ifindex = 0;
1295
1296 #if IS_ENABLED(CONFIG_IPV6)
1297 if (src_ip->sa.sa_family == AF_INET6 &&
1298 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1299 ifindex = src_ifindex;
1300 #endif
1301
1302 f = vxlan_find_mac(vxlan, src_mac, vni);
1303 if (likely(f)) {
1304 struct vxlan_rdst *rdst = first_remote_rcu(f);
1305
1306 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1307 rdst->remote_ifindex == ifindex))
1308 return false;
1309
1310 /* Don't migrate static entries, drop packets */
1311 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1312 return true;
1313
1314 if (net_ratelimit())
1315 netdev_info(dev,
1316 "%pM migrated from %pIS to %pIS\n",
1317 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1318
1319 rdst->remote_ip = *src_ip;
1320 f->updated = jiffies;
1321 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1322 } else {
1323 u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
1324
1325 /* learned new entry */
1326 spin_lock(&vxlan->hash_lock[hash_index]);
1327
1328 /* close off race between vxlan_flush and incoming packets */
1329 if (netif_running(dev))
1330 vxlan_fdb_update(vxlan, src_mac, src_ip,
1331 NUD_REACHABLE,
1332 NLM_F_EXCL|NLM_F_CREATE,
1333 vxlan->cfg.dst_port,
1334 vni,
1335 vxlan->default_dst.remote_vni,
1336 ifindex, NTF_SELF, true, NULL);
1337 spin_unlock(&vxlan->hash_lock[hash_index]);
1338 }
1339
1340 return false;
1341 }
1342
1343 /* See if multicast group is already in use by other ID */
1344 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1345 {
1346 struct vxlan_dev *vxlan;
1347 struct vxlan_sock *sock4;
1348 #if IS_ENABLED(CONFIG_IPV6)
1349 struct vxlan_sock *sock6;
1350 #endif
1351 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1352
1353 sock4 = rtnl_dereference(dev->vn4_sock);
1354
1355 /* The vxlan_sock is only used by dev, leaving group has
1356 * no effect on other vxlan devices.
1357 */
1358 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1359 return false;
1360 #if IS_ENABLED(CONFIG_IPV6)
1361 sock6 = rtnl_dereference(dev->vn6_sock);
1362 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1363 return false;
1364 #endif
1365
1366 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1367 if (!netif_running(vxlan->dev) || vxlan == dev)
1368 continue;
1369
1370 if (family == AF_INET &&
1371 rtnl_dereference(vxlan->vn4_sock) != sock4)
1372 continue;
1373 #if IS_ENABLED(CONFIG_IPV6)
1374 if (family == AF_INET6 &&
1375 rtnl_dereference(vxlan->vn6_sock) != sock6)
1376 continue;
1377 #endif
1378
1379 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1380 &dev->default_dst.remote_ip))
1381 continue;
1382
1383 if (vxlan->default_dst.remote_ifindex !=
1384 dev->default_dst.remote_ifindex)
1385 continue;
1386
1387 return true;
1388 }
1389
1390 return false;
1391 }
1392
1393 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1394 {
1395 struct vxlan_net *vn;
1396
1397 if (!vs)
1398 return false;
1399 if (!refcount_dec_and_test(&vs->refcnt))
1400 return false;
1401
1402 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1403 spin_lock(&vn->sock_lock);
1404 hlist_del_rcu(&vs->hlist);
1405 udp_tunnel_notify_del_rx_port(vs->sock,
1406 (vs->flags & VXLAN_F_GPE) ?
1407 UDP_TUNNEL_TYPE_VXLAN_GPE :
1408 UDP_TUNNEL_TYPE_VXLAN);
1409 spin_unlock(&vn->sock_lock);
1410
1411 return true;
1412 }
1413
1414 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1415 {
1416 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1417 #if IS_ENABLED(CONFIG_IPV6)
1418 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1419
1420 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1421 #endif
1422
1423 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1424 synchronize_net();
1425
1426 vxlan_vs_del_dev(vxlan);
1427
1428 if (__vxlan_sock_release_prep(sock4)) {
1429 udp_tunnel_sock_release(sock4->sock);
1430 kfree(sock4);
1431 }
1432
1433 #if IS_ENABLED(CONFIG_IPV6)
1434 if (__vxlan_sock_release_prep(sock6)) {
1435 udp_tunnel_sock_release(sock6->sock);
1436 kfree(sock6);
1437 }
1438 #endif
1439 }
1440
1441 /* Update multicast group membership when first VNI on
1442 * multicast address is brought up
1443 */
1444 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1445 {
1446 struct sock *sk;
1447 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1448 int ifindex = vxlan->default_dst.remote_ifindex;
1449 int ret = -EINVAL;
1450
1451 if (ip->sa.sa_family == AF_INET) {
1452 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1453 struct ip_mreqn mreq = {
1454 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1455 .imr_ifindex = ifindex,
1456 };
1457
1458 sk = sock4->sock->sk;
1459 lock_sock(sk);
1460 ret = ip_mc_join_group(sk, &mreq);
1461 release_sock(sk);
1462 #if IS_ENABLED(CONFIG_IPV6)
1463 } else {
1464 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1465
1466 sk = sock6->sock->sk;
1467 lock_sock(sk);
1468 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1469 &ip->sin6.sin6_addr);
1470 release_sock(sk);
1471 #endif
1472 }
1473
1474 return ret;
1475 }
1476
1477 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1478 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1479 {
1480 struct sock *sk;
1481 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1482 int ifindex = vxlan->default_dst.remote_ifindex;
1483 int ret = -EINVAL;
1484
1485 if (ip->sa.sa_family == AF_INET) {
1486 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1487 struct ip_mreqn mreq = {
1488 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1489 .imr_ifindex = ifindex,
1490 };
1491
1492 sk = sock4->sock->sk;
1493 lock_sock(sk);
1494 ret = ip_mc_leave_group(sk, &mreq);
1495 release_sock(sk);
1496 #if IS_ENABLED(CONFIG_IPV6)
1497 } else {
1498 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1499
1500 sk = sock6->sock->sk;
1501 lock_sock(sk);
1502 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1503 &ip->sin6.sin6_addr);
1504 release_sock(sk);
1505 #endif
1506 }
1507
1508 return ret;
1509 }
1510
1511 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1512 struct sk_buff *skb, u32 vxflags)
1513 {
1514 size_t start, offset;
1515
1516 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1517 goto out;
1518
1519 start = vxlan_rco_start(unparsed->vx_vni);
1520 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1521
1522 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1523 return false;
1524
1525 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1526 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1527 out:
1528 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1529 unparsed->vx_vni &= VXLAN_VNI_MASK;
1530 return true;
1531 }
1532
1533 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1534 struct sk_buff *skb, u32 vxflags,
1535 struct vxlan_metadata *md)
1536 {
1537 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1538 struct metadata_dst *tun_dst;
1539
1540 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1541 goto out;
1542
1543 md->gbp = ntohs(gbp->policy_id);
1544
1545 tun_dst = (struct metadata_dst *)skb_dst(skb);
1546 if (tun_dst) {
1547 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1548 tun_dst->u.tun_info.options_len = sizeof(*md);
1549 }
1550 if (gbp->dont_learn)
1551 md->gbp |= VXLAN_GBP_DONT_LEARN;
1552
1553 if (gbp->policy_applied)
1554 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1555
1556 /* In flow-based mode, GBP is carried in dst_metadata */
1557 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1558 skb->mark = md->gbp;
1559 out:
1560 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1561 }
1562
1563 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1564 __be16 *protocol,
1565 struct sk_buff *skb, u32 vxflags)
1566 {
1567 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1568
1569 /* Need to have Next Protocol set for interfaces in GPE mode. */
1570 if (!gpe->np_applied)
1571 return false;
1572 /* "The initial version is 0. If a receiver does not support the
1573 * version indicated it MUST drop the packet.
1574 */
1575 if (gpe->version != 0)
1576 return false;
1577 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1578 * processing MUST occur." However, we don't implement OAM
1579 * processing, thus drop the packet.
1580 */
1581 if (gpe->oam_flag)
1582 return false;
1583
1584 *protocol = tun_p_to_eth_p(gpe->next_protocol);
1585 if (!*protocol)
1586 return false;
1587
1588 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1589 return true;
1590 }
1591
1592 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1593 struct vxlan_sock *vs,
1594 struct sk_buff *skb, __be32 vni)
1595 {
1596 union vxlan_addr saddr;
1597 u32 ifindex = skb->dev->ifindex;
1598
1599 skb_reset_mac_header(skb);
1600 skb->protocol = eth_type_trans(skb, vxlan->dev);
1601 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1602
1603 /* Ignore packet loops (and multicast echo) */
1604 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1605 return false;
1606
1607 /* Get address from the outer IP header */
1608 if (vxlan_get_sk_family(vs) == AF_INET) {
1609 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1610 saddr.sa.sa_family = AF_INET;
1611 #if IS_ENABLED(CONFIG_IPV6)
1612 } else {
1613 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1614 saddr.sa.sa_family = AF_INET6;
1615 #endif
1616 }
1617
1618 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1619 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1620 return false;
1621
1622 return true;
1623 }
1624
1625 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1626 struct sk_buff *skb)
1627 {
1628 int err = 0;
1629
1630 if (vxlan_get_sk_family(vs) == AF_INET)
1631 err = IP_ECN_decapsulate(oiph, skb);
1632 #if IS_ENABLED(CONFIG_IPV6)
1633 else
1634 err = IP6_ECN_decapsulate(oiph, skb);
1635 #endif
1636
1637 if (unlikely(err) && log_ecn_error) {
1638 if (vxlan_get_sk_family(vs) == AF_INET)
1639 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1640 &((struct iphdr *)oiph)->saddr,
1641 ((struct iphdr *)oiph)->tos);
1642 else
1643 net_info_ratelimited("non-ECT from %pI6\n",
1644 &((struct ipv6hdr *)oiph)->saddr);
1645 }
1646 return err <= 1;
1647 }
1648
1649 /* Callback from net/ipv4/udp.c to receive packets */
1650 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1651 {
1652 struct pcpu_sw_netstats *stats;
1653 struct vxlan_dev *vxlan;
1654 struct vxlan_sock *vs;
1655 struct vxlanhdr unparsed;
1656 struct vxlan_metadata _md;
1657 struct vxlan_metadata *md = &_md;
1658 __be16 protocol = htons(ETH_P_TEB);
1659 bool raw_proto = false;
1660 void *oiph;
1661 __be32 vni = 0;
1662
1663 /* Need UDP and VXLAN header to be present */
1664 if (!pskb_may_pull(skb, VXLAN_HLEN))
1665 goto drop;
1666
1667 unparsed = *vxlan_hdr(skb);
1668 /* VNI flag always required to be set */
1669 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1670 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1671 ntohl(vxlan_hdr(skb)->vx_flags),
1672 ntohl(vxlan_hdr(skb)->vx_vni));
1673 /* Return non vxlan pkt */
1674 goto drop;
1675 }
1676 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1677 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1678
1679 vs = rcu_dereference_sk_user_data(sk);
1680 if (!vs)
1681 goto drop;
1682
1683 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1684
1685 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1686 if (!vxlan)
1687 goto drop;
1688
1689 /* For backwards compatibility, only allow reserved fields to be
1690 * used by VXLAN extensions if explicitly requested.
1691 */
1692 if (vs->flags & VXLAN_F_GPE) {
1693 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1694 goto drop;
1695 raw_proto = true;
1696 }
1697
1698 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1699 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1700 goto drop;
1701
1702 if (vxlan_collect_metadata(vs)) {
1703 struct metadata_dst *tun_dst;
1704
1705 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1706 key32_to_tunnel_id(vni), sizeof(*md));
1707
1708 if (!tun_dst)
1709 goto drop;
1710
1711 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1712
1713 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1714 } else {
1715 memset(md, 0, sizeof(*md));
1716 }
1717
1718 if (vs->flags & VXLAN_F_REMCSUM_RX)
1719 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1720 goto drop;
1721 if (vs->flags & VXLAN_F_GBP)
1722 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1723 /* Note that GBP and GPE can never be active together. This is
1724 * ensured in vxlan_dev_configure.
1725 */
1726
1727 if (unparsed.vx_flags || unparsed.vx_vni) {
1728 /* If there are any unprocessed flags remaining treat
1729 * this as a malformed packet. This behavior diverges from
1730 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1731 * in reserved fields are to be ignored. The approach here
1732 * maintains compatibility with previous stack code, and also
1733 * is more robust and provides a little more security in
1734 * adding extensions to VXLAN.
1735 */
1736 goto drop;
1737 }
1738
1739 if (!raw_proto) {
1740 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1741 goto drop;
1742 } else {
1743 skb_reset_mac_header(skb);
1744 skb->dev = vxlan->dev;
1745 skb->pkt_type = PACKET_HOST;
1746 }
1747
1748 oiph = skb_network_header(skb);
1749 skb_reset_network_header(skb);
1750
1751 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1752 ++vxlan->dev->stats.rx_frame_errors;
1753 ++vxlan->dev->stats.rx_errors;
1754 goto drop;
1755 }
1756
1757 rcu_read_lock();
1758
1759 if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1760 rcu_read_unlock();
1761 atomic_long_inc(&vxlan->dev->rx_dropped);
1762 goto drop;
1763 }
1764
1765 stats = this_cpu_ptr(vxlan->dev->tstats);
1766 u64_stats_update_begin(&stats->syncp);
1767 stats->rx_packets++;
1768 stats->rx_bytes += skb->len;
1769 u64_stats_update_end(&stats->syncp);
1770
1771 gro_cells_receive(&vxlan->gro_cells, skb);
1772
1773 rcu_read_unlock();
1774
1775 return 0;
1776
1777 drop:
1778 /* Consume bad packet */
1779 kfree_skb(skb);
1780 return 0;
1781 }
1782
1783 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1784 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1785 {
1786 struct vxlan_dev *vxlan;
1787 struct vxlan_sock *vs;
1788 struct vxlanhdr *hdr;
1789 __be32 vni;
1790
1791 if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1792 return -EINVAL;
1793
1794 hdr = vxlan_hdr(skb);
1795
1796 if (!(hdr->vx_flags & VXLAN_HF_VNI))
1797 return -EINVAL;
1798
1799 vs = rcu_dereference_sk_user_data(sk);
1800 if (!vs)
1801 return -ENOENT;
1802
1803 vni = vxlan_vni(hdr->vx_vni);
1804 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1805 if (!vxlan)
1806 return -ENOENT;
1807
1808 return 0;
1809 }
1810
1811 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1812 {
1813 struct vxlan_dev *vxlan = netdev_priv(dev);
1814 struct arphdr *parp;
1815 u8 *arpptr, *sha;
1816 __be32 sip, tip;
1817 struct neighbour *n;
1818
1819 if (dev->flags & IFF_NOARP)
1820 goto out;
1821
1822 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1823 dev->stats.tx_dropped++;
1824 goto out;
1825 }
1826 parp = arp_hdr(skb);
1827
1828 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1829 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1830 parp->ar_pro != htons(ETH_P_IP) ||
1831 parp->ar_op != htons(ARPOP_REQUEST) ||
1832 parp->ar_hln != dev->addr_len ||
1833 parp->ar_pln != 4)
1834 goto out;
1835 arpptr = (u8 *)parp + sizeof(struct arphdr);
1836 sha = arpptr;
1837 arpptr += dev->addr_len; /* sha */
1838 memcpy(&sip, arpptr, sizeof(sip));
1839 arpptr += sizeof(sip);
1840 arpptr += dev->addr_len; /* tha */
1841 memcpy(&tip, arpptr, sizeof(tip));
1842
1843 if (ipv4_is_loopback(tip) ||
1844 ipv4_is_multicast(tip))
1845 goto out;
1846
1847 n = neigh_lookup(&arp_tbl, &tip, dev);
1848
1849 if (n) {
1850 struct vxlan_fdb *f;
1851 struct sk_buff *reply;
1852
1853 if (!(n->nud_state & NUD_CONNECTED)) {
1854 neigh_release(n);
1855 goto out;
1856 }
1857
1858 f = vxlan_find_mac(vxlan, n->ha, vni);
1859 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1860 /* bridge-local neighbor */
1861 neigh_release(n);
1862 goto out;
1863 }
1864
1865 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1866 n->ha, sha);
1867
1868 neigh_release(n);
1869
1870 if (reply == NULL)
1871 goto out;
1872
1873 skb_reset_mac_header(reply);
1874 __skb_pull(reply, skb_network_offset(reply));
1875 reply->ip_summed = CHECKSUM_UNNECESSARY;
1876 reply->pkt_type = PACKET_HOST;
1877
1878 if (netif_rx_ni(reply) == NET_RX_DROP)
1879 dev->stats.rx_dropped++;
1880 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1881 union vxlan_addr ipa = {
1882 .sin.sin_addr.s_addr = tip,
1883 .sin.sin_family = AF_INET,
1884 };
1885
1886 vxlan_ip_miss(dev, &ipa);
1887 }
1888 out:
1889 consume_skb(skb);
1890 return NETDEV_TX_OK;
1891 }
1892
1893 #if IS_ENABLED(CONFIG_IPV6)
1894 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1895 struct neighbour *n, bool isrouter)
1896 {
1897 struct net_device *dev = request->dev;
1898 struct sk_buff *reply;
1899 struct nd_msg *ns, *na;
1900 struct ipv6hdr *pip6;
1901 u8 *daddr;
1902 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1903 int ns_olen;
1904 int i, len;
1905
1906 if (dev == NULL || !pskb_may_pull(request, request->len))
1907 return NULL;
1908
1909 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1910 sizeof(*na) + na_olen + dev->needed_tailroom;
1911 reply = alloc_skb(len, GFP_ATOMIC);
1912 if (reply == NULL)
1913 return NULL;
1914
1915 reply->protocol = htons(ETH_P_IPV6);
1916 reply->dev = dev;
1917 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1918 skb_push(reply, sizeof(struct ethhdr));
1919 skb_reset_mac_header(reply);
1920
1921 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1922
1923 daddr = eth_hdr(request)->h_source;
1924 ns_olen = request->len - skb_network_offset(request) -
1925 sizeof(struct ipv6hdr) - sizeof(*ns);
1926 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1927 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1928 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1929 break;
1930 }
1931 }
1932
1933 /* Ethernet header */
1934 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1935 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1936 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1937 reply->protocol = htons(ETH_P_IPV6);
1938
1939 skb_pull(reply, sizeof(struct ethhdr));
1940 skb_reset_network_header(reply);
1941 skb_put(reply, sizeof(struct ipv6hdr));
1942
1943 /* IPv6 header */
1944
1945 pip6 = ipv6_hdr(reply);
1946 memset(pip6, 0, sizeof(struct ipv6hdr));
1947 pip6->version = 6;
1948 pip6->priority = ipv6_hdr(request)->priority;
1949 pip6->nexthdr = IPPROTO_ICMPV6;
1950 pip6->hop_limit = 255;
1951 pip6->daddr = ipv6_hdr(request)->saddr;
1952 pip6->saddr = *(struct in6_addr *)n->primary_key;
1953
1954 skb_pull(reply, sizeof(struct ipv6hdr));
1955 skb_reset_transport_header(reply);
1956
1957 /* Neighbor Advertisement */
1958 na = skb_put_zero(reply, sizeof(*na) + na_olen);
1959 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1960 na->icmph.icmp6_router = isrouter;
1961 na->icmph.icmp6_override = 1;
1962 na->icmph.icmp6_solicited = 1;
1963 na->target = ns->target;
1964 ether_addr_copy(&na->opt[2], n->ha);
1965 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1966 na->opt[1] = na_olen >> 3;
1967
1968 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1969 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1970 csum_partial(na, sizeof(*na)+na_olen, 0));
1971
1972 pip6->payload_len = htons(sizeof(*na)+na_olen);
1973
1974 skb_push(reply, sizeof(struct ipv6hdr));
1975
1976 reply->ip_summed = CHECKSUM_UNNECESSARY;
1977
1978 return reply;
1979 }
1980
1981 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1982 {
1983 struct vxlan_dev *vxlan = netdev_priv(dev);
1984 const struct in6_addr *daddr;
1985 const struct ipv6hdr *iphdr;
1986 struct inet6_dev *in6_dev;
1987 struct neighbour *n;
1988 struct nd_msg *msg;
1989
1990 in6_dev = __in6_dev_get(dev);
1991 if (!in6_dev)
1992 goto out;
1993
1994 iphdr = ipv6_hdr(skb);
1995 daddr = &iphdr->daddr;
1996 msg = (struct nd_msg *)(iphdr + 1);
1997
1998 if (ipv6_addr_loopback(daddr) ||
1999 ipv6_addr_is_multicast(&msg->target))
2000 goto out;
2001
2002 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
2003
2004 if (n) {
2005 struct vxlan_fdb *f;
2006 struct sk_buff *reply;
2007
2008 if (!(n->nud_state & NUD_CONNECTED)) {
2009 neigh_release(n);
2010 goto out;
2011 }
2012
2013 f = vxlan_find_mac(vxlan, n->ha, vni);
2014 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2015 /* bridge-local neighbor */
2016 neigh_release(n);
2017 goto out;
2018 }
2019
2020 reply = vxlan_na_create(skb, n,
2021 !!(f ? f->flags & NTF_ROUTER : 0));
2022
2023 neigh_release(n);
2024
2025 if (reply == NULL)
2026 goto out;
2027
2028 if (netif_rx_ni(reply) == NET_RX_DROP)
2029 dev->stats.rx_dropped++;
2030
2031 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2032 union vxlan_addr ipa = {
2033 .sin6.sin6_addr = msg->target,
2034 .sin6.sin6_family = AF_INET6,
2035 };
2036
2037 vxlan_ip_miss(dev, &ipa);
2038 }
2039
2040 out:
2041 consume_skb(skb);
2042 return NETDEV_TX_OK;
2043 }
2044 #endif
2045
2046 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2047 {
2048 struct vxlan_dev *vxlan = netdev_priv(dev);
2049 struct neighbour *n;
2050
2051 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2052 return false;
2053
2054 n = NULL;
2055 switch (ntohs(eth_hdr(skb)->h_proto)) {
2056 case ETH_P_IP:
2057 {
2058 struct iphdr *pip;
2059
2060 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2061 return false;
2062 pip = ip_hdr(skb);
2063 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2064 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2065 union vxlan_addr ipa = {
2066 .sin.sin_addr.s_addr = pip->daddr,
2067 .sin.sin_family = AF_INET,
2068 };
2069
2070 vxlan_ip_miss(dev, &ipa);
2071 return false;
2072 }
2073
2074 break;
2075 }
2076 #if IS_ENABLED(CONFIG_IPV6)
2077 case ETH_P_IPV6:
2078 {
2079 struct ipv6hdr *pip6;
2080
2081 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2082 return false;
2083 pip6 = ipv6_hdr(skb);
2084 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2085 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2086 union vxlan_addr ipa = {
2087 .sin6.sin6_addr = pip6->daddr,
2088 .sin6.sin6_family = AF_INET6,
2089 };
2090
2091 vxlan_ip_miss(dev, &ipa);
2092 return false;
2093 }
2094
2095 break;
2096 }
2097 #endif
2098 default:
2099 return false;
2100 }
2101
2102 if (n) {
2103 bool diff;
2104
2105 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2106 if (diff) {
2107 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2108 dev->addr_len);
2109 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2110 }
2111 neigh_release(n);
2112 return diff;
2113 }
2114
2115 return false;
2116 }
2117
2118 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
2119 struct vxlan_metadata *md)
2120 {
2121 struct vxlanhdr_gbp *gbp;
2122
2123 if (!md->gbp)
2124 return;
2125
2126 gbp = (struct vxlanhdr_gbp *)vxh;
2127 vxh->vx_flags |= VXLAN_HF_GBP;
2128
2129 if (md->gbp & VXLAN_GBP_DONT_LEARN)
2130 gbp->dont_learn = 1;
2131
2132 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
2133 gbp->policy_applied = 1;
2134
2135 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
2136 }
2137
2138 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
2139 __be16 protocol)
2140 {
2141 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2142
2143 gpe->np_applied = 1;
2144 gpe->next_protocol = tun_p_from_eth_p(protocol);
2145 if (!gpe->next_protocol)
2146 return -EPFNOSUPPORT;
2147 return 0;
2148 }
2149
2150 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2151 int iphdr_len, __be32 vni,
2152 struct vxlan_metadata *md, u32 vxflags,
2153 bool udp_sum)
2154 {
2155 struct vxlanhdr *vxh;
2156 int min_headroom;
2157 int err;
2158 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2159 __be16 inner_protocol = htons(ETH_P_TEB);
2160
2161 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2162 skb->ip_summed == CHECKSUM_PARTIAL) {
2163 int csum_start = skb_checksum_start_offset(skb);
2164
2165 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2166 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2167 (skb->csum_offset == offsetof(struct udphdr, check) ||
2168 skb->csum_offset == offsetof(struct tcphdr, check)))
2169 type |= SKB_GSO_TUNNEL_REMCSUM;
2170 }
2171
2172 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2173 + VXLAN_HLEN + iphdr_len;
2174
2175 /* Need space for new headers (invalidates iph ptr) */
2176 err = skb_cow_head(skb, min_headroom);
2177 if (unlikely(err))
2178 return err;
2179
2180 err = iptunnel_handle_offloads(skb, type);
2181 if (err)
2182 return err;
2183
2184 vxh = __skb_push(skb, sizeof(*vxh));
2185 vxh->vx_flags = VXLAN_HF_VNI;
2186 vxh->vx_vni = vxlan_vni_field(vni);
2187
2188 if (type & SKB_GSO_TUNNEL_REMCSUM) {
2189 unsigned int start;
2190
2191 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2192 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2193 vxh->vx_flags |= VXLAN_HF_RCO;
2194
2195 if (!skb_is_gso(skb)) {
2196 skb->ip_summed = CHECKSUM_NONE;
2197 skb->encapsulation = 0;
2198 }
2199 }
2200
2201 if (vxflags & VXLAN_F_GBP)
2202 vxlan_build_gbp_hdr(vxh, vxflags, md);
2203 if (vxflags & VXLAN_F_GPE) {
2204 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
2205 if (err < 0)
2206 return err;
2207 inner_protocol = skb->protocol;
2208 }
2209
2210 skb_set_inner_protocol(skb, inner_protocol);
2211 return 0;
2212 }
2213
2214 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2215 struct vxlan_sock *sock4,
2216 struct sk_buff *skb, int oif, u8 tos,
2217 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2218 struct dst_cache *dst_cache,
2219 const struct ip_tunnel_info *info)
2220 {
2221 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2222 struct rtable *rt = NULL;
2223 struct flowi4 fl4;
2224
2225 if (!sock4)
2226 return ERR_PTR(-EIO);
2227
2228 if (tos && !info)
2229 use_cache = false;
2230 if (use_cache) {
2231 rt = dst_cache_get_ip4(dst_cache, saddr);
2232 if (rt)
2233 return rt;
2234 }
2235
2236 memset(&fl4, 0, sizeof(fl4));
2237 fl4.flowi4_oif = oif;
2238 fl4.flowi4_tos = RT_TOS(tos);
2239 fl4.flowi4_mark = skb->mark;
2240 fl4.flowi4_proto = IPPROTO_UDP;
2241 fl4.daddr = daddr;
2242 fl4.saddr = *saddr;
2243 fl4.fl4_dport = dport;
2244 fl4.fl4_sport = sport;
2245
2246 rt = ip_route_output_key(vxlan->net, &fl4);
2247 if (!IS_ERR(rt)) {
2248 if (rt->dst.dev == dev) {
2249 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2250 ip_rt_put(rt);
2251 return ERR_PTR(-ELOOP);
2252 }
2253
2254 *saddr = fl4.saddr;
2255 if (use_cache)
2256 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2257 } else {
2258 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2259 return ERR_PTR(-ENETUNREACH);
2260 }
2261 return rt;
2262 }
2263
2264 #if IS_ENABLED(CONFIG_IPV6)
2265 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2266 struct net_device *dev,
2267 struct vxlan_sock *sock6,
2268 struct sk_buff *skb, int oif, u8 tos,
2269 __be32 label,
2270 const struct in6_addr *daddr,
2271 struct in6_addr *saddr,
2272 __be16 dport, __be16 sport,
2273 struct dst_cache *dst_cache,
2274 const struct ip_tunnel_info *info)
2275 {
2276 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2277 struct dst_entry *ndst;
2278 struct flowi6 fl6;
2279 int err;
2280
2281 if (!sock6)
2282 return ERR_PTR(-EIO);
2283
2284 if (tos && !info)
2285 use_cache = false;
2286 if (use_cache) {
2287 ndst = dst_cache_get_ip6(dst_cache, saddr);
2288 if (ndst)
2289 return ndst;
2290 }
2291
2292 memset(&fl6, 0, sizeof(fl6));
2293 fl6.flowi6_oif = oif;
2294 fl6.daddr = *daddr;
2295 fl6.saddr = *saddr;
2296 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2297 fl6.flowi6_mark = skb->mark;
2298 fl6.flowi6_proto = IPPROTO_UDP;
2299 fl6.fl6_dport = dport;
2300 fl6.fl6_sport = sport;
2301
2302 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
2303 sock6->sock->sk,
2304 &ndst, &fl6);
2305 if (unlikely(err < 0)) {
2306 netdev_dbg(dev, "no route to %pI6\n", daddr);
2307 return ERR_PTR(-ENETUNREACH);
2308 }
2309
2310 if (unlikely(ndst->dev == dev)) {
2311 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2312 dst_release(ndst);
2313 return ERR_PTR(-ELOOP);
2314 }
2315
2316 *saddr = fl6.saddr;
2317 if (use_cache)
2318 dst_cache_set_ip6(dst_cache, ndst, saddr);
2319 return ndst;
2320 }
2321 #endif
2322
2323 /* Bypass encapsulation if the destination is local */
2324 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2325 struct vxlan_dev *dst_vxlan, __be32 vni)
2326 {
2327 struct pcpu_sw_netstats *tx_stats, *rx_stats;
2328 union vxlan_addr loopback;
2329 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2330 struct net_device *dev;
2331 int len = skb->len;
2332
2333 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2334 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2335 skb->pkt_type = PACKET_HOST;
2336 skb->encapsulation = 0;
2337 skb->dev = dst_vxlan->dev;
2338 __skb_pull(skb, skb_network_offset(skb));
2339
2340 if (remote_ip->sa.sa_family == AF_INET) {
2341 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2342 loopback.sa.sa_family = AF_INET;
2343 #if IS_ENABLED(CONFIG_IPV6)
2344 } else {
2345 loopback.sin6.sin6_addr = in6addr_loopback;
2346 loopback.sa.sa_family = AF_INET6;
2347 #endif
2348 }
2349
2350 rcu_read_lock();
2351 dev = skb->dev;
2352 if (unlikely(!(dev->flags & IFF_UP))) {
2353 kfree_skb(skb);
2354 goto drop;
2355 }
2356
2357 if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2358 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2359
2360 u64_stats_update_begin(&tx_stats->syncp);
2361 tx_stats->tx_packets++;
2362 tx_stats->tx_bytes += len;
2363 u64_stats_update_end(&tx_stats->syncp);
2364
2365 if (netif_rx(skb) == NET_RX_SUCCESS) {
2366 u64_stats_update_begin(&rx_stats->syncp);
2367 rx_stats->rx_packets++;
2368 rx_stats->rx_bytes += len;
2369 u64_stats_update_end(&rx_stats->syncp);
2370 } else {
2371 drop:
2372 dev->stats.rx_dropped++;
2373 }
2374 rcu_read_unlock();
2375 }
2376
2377 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2378 struct vxlan_dev *vxlan,
2379 union vxlan_addr *daddr,
2380 __be16 dst_port, int dst_ifindex, __be32 vni,
2381 struct dst_entry *dst,
2382 u32 rt_flags)
2383 {
2384 #if IS_ENABLED(CONFIG_IPV6)
2385 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2386 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2387 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2388 */
2389 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2390 #endif
2391 /* Bypass encapsulation if the destination is local */
2392 if (rt_flags & RTCF_LOCAL &&
2393 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2394 struct vxlan_dev *dst_vxlan;
2395
2396 dst_release(dst);
2397 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2398 daddr->sa.sa_family, dst_port,
2399 vxlan->cfg.flags);
2400 if (!dst_vxlan) {
2401 dev->stats.tx_errors++;
2402 kfree_skb(skb);
2403
2404 return -ENOENT;
2405 }
2406 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2407 return 1;
2408 }
2409
2410 return 0;
2411 }
2412
2413 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2414 __be32 default_vni, struct vxlan_rdst *rdst,
2415 bool did_rsc)
2416 {
2417 struct dst_cache *dst_cache;
2418 struct ip_tunnel_info *info;
2419 struct vxlan_dev *vxlan = netdev_priv(dev);
2420 const struct iphdr *old_iph = ip_hdr(skb);
2421 union vxlan_addr *dst;
2422 union vxlan_addr remote_ip, local_ip;
2423 struct vxlan_metadata _md;
2424 struct vxlan_metadata *md = &_md;
2425 __be16 src_port = 0, dst_port;
2426 struct dst_entry *ndst = NULL;
2427 __be32 vni, label;
2428 __u8 tos, ttl;
2429 int ifindex;
2430 int err;
2431 u32 flags = vxlan->cfg.flags;
2432 bool udp_sum = false;
2433 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2434
2435 info = skb_tunnel_info(skb);
2436
2437 if (rdst) {
2438 dst = &rdst->remote_ip;
2439 if (vxlan_addr_any(dst)) {
2440 if (did_rsc) {
2441 /* short-circuited back to local bridge */
2442 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2443 return;
2444 }
2445 goto drop;
2446 }
2447
2448 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2449 vni = (rdst->remote_vni) ? : default_vni;
2450 ifindex = rdst->remote_ifindex;
2451 local_ip = vxlan->cfg.saddr;
2452 dst_cache = &rdst->dst_cache;
2453 md->gbp = skb->mark;
2454 if (flags & VXLAN_F_TTL_INHERIT) {
2455 ttl = ip_tunnel_get_ttl(old_iph, skb);
2456 } else {
2457 ttl = vxlan->cfg.ttl;
2458 if (!ttl && vxlan_addr_multicast(dst))
2459 ttl = 1;
2460 }
2461
2462 tos = vxlan->cfg.tos;
2463 if (tos == 1)
2464 tos = ip_tunnel_get_dsfield(old_iph, skb);
2465
2466 if (dst->sa.sa_family == AF_INET)
2467 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2468 else
2469 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2470 label = vxlan->cfg.label;
2471 } else {
2472 if (!info) {
2473 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2474 dev->name);
2475 goto drop;
2476 }
2477 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2478 if (remote_ip.sa.sa_family == AF_INET) {
2479 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2480 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2481 } else {
2482 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2483 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2484 }
2485 dst = &remote_ip;
2486 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2487 vni = tunnel_id_to_key32(info->key.tun_id);
2488 ifindex = 0;
2489 dst_cache = &info->dst_cache;
2490 if (info->options_len &&
2491 info->key.tun_flags & TUNNEL_VXLAN_OPT)
2492 md = ip_tunnel_info_opts(info);
2493 ttl = info->key.ttl;
2494 tos = info->key.tos;
2495 label = info->key.label;
2496 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2497 }
2498 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2499 vxlan->cfg.port_max, true);
2500
2501 rcu_read_lock();
2502 if (dst->sa.sa_family == AF_INET) {
2503 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2504 struct rtable *rt;
2505 __be16 df = 0;
2506
2507 if (!ifindex)
2508 ifindex = sock4->sock->sk->sk_bound_dev_if;
2509
2510 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2511 dst->sin.sin_addr.s_addr,
2512 &local_ip.sin.sin_addr.s_addr,
2513 dst_port, src_port,
2514 dst_cache, info);
2515 if (IS_ERR(rt)) {
2516 err = PTR_ERR(rt);
2517 goto tx_error;
2518 }
2519
2520 if (!info) {
2521 /* Bypass encapsulation if the destination is local */
2522 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2523 dst_port, ifindex, vni,
2524 &rt->dst, rt->rt_flags);
2525 if (err)
2526 goto out_unlock;
2527
2528 if (vxlan->cfg.df == VXLAN_DF_SET) {
2529 df = htons(IP_DF);
2530 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2531 struct ethhdr *eth = eth_hdr(skb);
2532
2533 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2534 (ntohs(eth->h_proto) == ETH_P_IP &&
2535 old_iph->frag_off & htons(IP_DF)))
2536 df = htons(IP_DF);
2537 }
2538 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2539 df = htons(IP_DF);
2540 }
2541
2542 ndst = &rt->dst;
2543 skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
2544
2545 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2546 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2547 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2548 vni, md, flags, udp_sum);
2549 if (err < 0)
2550 goto tx_error;
2551
2552 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2553 dst->sin.sin_addr.s_addr, tos, ttl, df,
2554 src_port, dst_port, xnet, !udp_sum);
2555 #if IS_ENABLED(CONFIG_IPV6)
2556 } else {
2557 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2558
2559 if (!ifindex)
2560 ifindex = sock6->sock->sk->sk_bound_dev_if;
2561
2562 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2563 label, &dst->sin6.sin6_addr,
2564 &local_ip.sin6.sin6_addr,
2565 dst_port, src_port,
2566 dst_cache, info);
2567 if (IS_ERR(ndst)) {
2568 err = PTR_ERR(ndst);
2569 ndst = NULL;
2570 goto tx_error;
2571 }
2572
2573 if (!info) {
2574 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2575
2576 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2577 dst_port, ifindex, vni,
2578 ndst, rt6i_flags);
2579 if (err)
2580 goto out_unlock;
2581 }
2582
2583 skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
2584
2585 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2586 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2587 skb_scrub_packet(skb, xnet);
2588 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2589 vni, md, flags, udp_sum);
2590 if (err < 0)
2591 goto tx_error;
2592
2593 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2594 &local_ip.sin6.sin6_addr,
2595 &dst->sin6.sin6_addr, tos, ttl,
2596 label, src_port, dst_port, !udp_sum);
2597 #endif
2598 }
2599 out_unlock:
2600 rcu_read_unlock();
2601 return;
2602
2603 drop:
2604 dev->stats.tx_dropped++;
2605 dev_kfree_skb(skb);
2606 return;
2607
2608 tx_error:
2609 rcu_read_unlock();
2610 if (err == -ELOOP)
2611 dev->stats.collisions++;
2612 else if (err == -ENETUNREACH)
2613 dev->stats.tx_carrier_errors++;
2614 dst_release(ndst);
2615 dev->stats.tx_errors++;
2616 kfree_skb(skb);
2617 }
2618
2619 /* Transmit local packets over Vxlan
2620 *
2621 * Outer IP header inherits ECN and DF from inner header.
2622 * Outer UDP destination is the VXLAN assigned port.
2623 * source port is based on hash of flow
2624 */
2625 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2626 {
2627 struct vxlan_dev *vxlan = netdev_priv(dev);
2628 struct vxlan_rdst *rdst, *fdst = NULL;
2629 const struct ip_tunnel_info *info;
2630 bool did_rsc = false;
2631 struct vxlan_fdb *f;
2632 struct ethhdr *eth;
2633 __be32 vni = 0;
2634
2635 info = skb_tunnel_info(skb);
2636
2637 skb_reset_mac_header(skb);
2638
2639 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2640 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2641 info->mode & IP_TUNNEL_INFO_TX) {
2642 vni = tunnel_id_to_key32(info->key.tun_id);
2643 } else {
2644 if (info && info->mode & IP_TUNNEL_INFO_TX)
2645 vxlan_xmit_one(skb, dev, vni, NULL, false);
2646 else
2647 kfree_skb(skb);
2648 return NETDEV_TX_OK;
2649 }
2650 }
2651
2652 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2653 eth = eth_hdr(skb);
2654 if (ntohs(eth->h_proto) == ETH_P_ARP)
2655 return arp_reduce(dev, skb, vni);
2656 #if IS_ENABLED(CONFIG_IPV6)
2657 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2658 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2659 sizeof(struct nd_msg)) &&
2660 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2661 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2662
2663 if (m->icmph.icmp6_code == 0 &&
2664 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2665 return neigh_reduce(dev, skb, vni);
2666 }
2667 #endif
2668 }
2669
2670 eth = eth_hdr(skb);
2671 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2672 did_rsc = false;
2673
2674 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2675 (ntohs(eth->h_proto) == ETH_P_IP ||
2676 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2677 did_rsc = route_shortcircuit(dev, skb);
2678 if (did_rsc)
2679 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2680 }
2681
2682 if (f == NULL) {
2683 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2684 if (f == NULL) {
2685 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2686 !is_multicast_ether_addr(eth->h_dest))
2687 vxlan_fdb_miss(vxlan, eth->h_dest);
2688
2689 dev->stats.tx_dropped++;
2690 kfree_skb(skb);
2691 return NETDEV_TX_OK;
2692 }
2693 }
2694
2695 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2696 struct sk_buff *skb1;
2697
2698 if (!fdst) {
2699 fdst = rdst;
2700 continue;
2701 }
2702 skb1 = skb_clone(skb, GFP_ATOMIC);
2703 if (skb1)
2704 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2705 }
2706
2707 if (fdst)
2708 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2709 else
2710 kfree_skb(skb);
2711 return NETDEV_TX_OK;
2712 }
2713
2714 /* Walk the forwarding table and purge stale entries */
2715 static void vxlan_cleanup(struct timer_list *t)
2716 {
2717 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2718 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2719 unsigned int h;
2720
2721 if (!netif_running(vxlan->dev))
2722 return;
2723
2724 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2725 struct hlist_node *p, *n;
2726
2727 spin_lock(&vxlan->hash_lock[h]);
2728 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2729 struct vxlan_fdb *f
2730 = container_of(p, struct vxlan_fdb, hlist);
2731 unsigned long timeout;
2732
2733 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2734 continue;
2735
2736 if (f->flags & NTF_EXT_LEARNED)
2737 continue;
2738
2739 timeout = f->used + vxlan->cfg.age_interval * HZ;
2740 if (time_before_eq(timeout, jiffies)) {
2741 netdev_dbg(vxlan->dev,
2742 "garbage collect %pM\n",
2743 f->eth_addr);
2744 f->state = NUD_STALE;
2745 vxlan_fdb_destroy(vxlan, f, true, true);
2746 } else if (time_before(timeout, next_timer))
2747 next_timer = timeout;
2748 }
2749 spin_unlock(&vxlan->hash_lock[h]);
2750 }
2751
2752 mod_timer(&vxlan->age_timer, next_timer);
2753 }
2754
2755 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2756 {
2757 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2758
2759 spin_lock(&vn->sock_lock);
2760 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2761 #if IS_ENABLED(CONFIG_IPV6)
2762 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2763 #endif
2764 spin_unlock(&vn->sock_lock);
2765 }
2766
2767 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2768 struct vxlan_dev_node *node)
2769 {
2770 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2771 __be32 vni = vxlan->default_dst.remote_vni;
2772
2773 node->vxlan = vxlan;
2774 spin_lock(&vn->sock_lock);
2775 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2776 spin_unlock(&vn->sock_lock);
2777 }
2778
2779 /* Setup stats when device is created */
2780 static int vxlan_init(struct net_device *dev)
2781 {
2782 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2783 if (!dev->tstats)
2784 return -ENOMEM;
2785
2786 return 0;
2787 }
2788
2789 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2790 {
2791 struct vxlan_fdb *f;
2792 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
2793
2794 spin_lock_bh(&vxlan->hash_lock[hash_index]);
2795 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2796 if (f)
2797 vxlan_fdb_destroy(vxlan, f, true, true);
2798 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
2799 }
2800
2801 static void vxlan_uninit(struct net_device *dev)
2802 {
2803 struct vxlan_dev *vxlan = netdev_priv(dev);
2804
2805 gro_cells_destroy(&vxlan->gro_cells);
2806
2807 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2808
2809 free_percpu(dev->tstats);
2810 }
2811
2812 /* Start ageing timer and join group when device is brought up */
2813 static int vxlan_open(struct net_device *dev)
2814 {
2815 struct vxlan_dev *vxlan = netdev_priv(dev);
2816 int ret;
2817
2818 ret = vxlan_sock_add(vxlan);
2819 if (ret < 0)
2820 return ret;
2821
2822 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2823 ret = vxlan_igmp_join(vxlan);
2824 if (ret == -EADDRINUSE)
2825 ret = 0;
2826 if (ret) {
2827 vxlan_sock_release(vxlan);
2828 return ret;
2829 }
2830 }
2831
2832 if (vxlan->cfg.age_interval)
2833 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2834
2835 return ret;
2836 }
2837
2838 /* Purge the forwarding table */
2839 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2840 {
2841 unsigned int h;
2842
2843 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2844 struct hlist_node *p, *n;
2845
2846 spin_lock_bh(&vxlan->hash_lock[h]);
2847 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2848 struct vxlan_fdb *f
2849 = container_of(p, struct vxlan_fdb, hlist);
2850 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2851 continue;
2852 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2853 if (!is_zero_ether_addr(f->eth_addr))
2854 vxlan_fdb_destroy(vxlan, f, true, true);
2855 }
2856 spin_unlock_bh(&vxlan->hash_lock[h]);
2857 }
2858 }
2859
2860 /* Cleanup timer and forwarding table on shutdown */
2861 static int vxlan_stop(struct net_device *dev)
2862 {
2863 struct vxlan_dev *vxlan = netdev_priv(dev);
2864 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2865 int ret = 0;
2866
2867 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2868 !vxlan_group_used(vn, vxlan))
2869 ret = vxlan_igmp_leave(vxlan);
2870
2871 del_timer_sync(&vxlan->age_timer);
2872
2873 vxlan_flush(vxlan, false);
2874 vxlan_sock_release(vxlan);
2875
2876 return ret;
2877 }
2878
2879 /* Stub, nothing needs to be done. */
2880 static void vxlan_set_multicast_list(struct net_device *dev)
2881 {
2882 }
2883
2884 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2885 {
2886 struct vxlan_dev *vxlan = netdev_priv(dev);
2887 struct vxlan_rdst *dst = &vxlan->default_dst;
2888 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2889 dst->remote_ifindex);
2890 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2891
2892 /* This check is different than dev->max_mtu, because it looks at
2893 * the lowerdev->mtu, rather than the static dev->max_mtu
2894 */
2895 if (lowerdev) {
2896 int max_mtu = lowerdev->mtu -
2897 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2898 if (new_mtu > max_mtu)
2899 return -EINVAL;
2900 }
2901
2902 dev->mtu = new_mtu;
2903 return 0;
2904 }
2905
2906 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2907 {
2908 struct vxlan_dev *vxlan = netdev_priv(dev);
2909 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2910 __be16 sport, dport;
2911
2912 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2913 vxlan->cfg.port_max, true);
2914 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2915
2916 if (ip_tunnel_info_af(info) == AF_INET) {
2917 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2918 struct rtable *rt;
2919
2920 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2921 info->key.u.ipv4.dst,
2922 &info->key.u.ipv4.src, dport, sport,
2923 &info->dst_cache, info);
2924 if (IS_ERR(rt))
2925 return PTR_ERR(rt);
2926 ip_rt_put(rt);
2927 } else {
2928 #if IS_ENABLED(CONFIG_IPV6)
2929 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2930 struct dst_entry *ndst;
2931
2932 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2933 info->key.label, &info->key.u.ipv6.dst,
2934 &info->key.u.ipv6.src, dport, sport,
2935 &info->dst_cache, info);
2936 if (IS_ERR(ndst))
2937 return PTR_ERR(ndst);
2938 dst_release(ndst);
2939 #else /* !CONFIG_IPV6 */
2940 return -EPFNOSUPPORT;
2941 #endif
2942 }
2943 info->key.tp_src = sport;
2944 info->key.tp_dst = dport;
2945 return 0;
2946 }
2947
2948 static const struct net_device_ops vxlan_netdev_ether_ops = {
2949 .ndo_init = vxlan_init,
2950 .ndo_uninit = vxlan_uninit,
2951 .ndo_open = vxlan_open,
2952 .ndo_stop = vxlan_stop,
2953 .ndo_start_xmit = vxlan_xmit,
2954 .ndo_get_stats64 = ip_tunnel_get_stats64,
2955 .ndo_set_rx_mode = vxlan_set_multicast_list,
2956 .ndo_change_mtu = vxlan_change_mtu,
2957 .ndo_validate_addr = eth_validate_addr,
2958 .ndo_set_mac_address = eth_mac_addr,
2959 .ndo_fdb_add = vxlan_fdb_add,
2960 .ndo_fdb_del = vxlan_fdb_delete,
2961 .ndo_fdb_dump = vxlan_fdb_dump,
2962 .ndo_fdb_get = vxlan_fdb_get,
2963 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2964 .ndo_change_proto_down = dev_change_proto_down_generic,
2965 };
2966
2967 static const struct net_device_ops vxlan_netdev_raw_ops = {
2968 .ndo_init = vxlan_init,
2969 .ndo_uninit = vxlan_uninit,
2970 .ndo_open = vxlan_open,
2971 .ndo_stop = vxlan_stop,
2972 .ndo_start_xmit = vxlan_xmit,
2973 .ndo_get_stats64 = ip_tunnel_get_stats64,
2974 .ndo_change_mtu = vxlan_change_mtu,
2975 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2976 };
2977
2978 /* Info for udev, that this is a virtual tunnel endpoint */
2979 static struct device_type vxlan_type = {
2980 .name = "vxlan",
2981 };
2982
2983 /* Calls the ndo_udp_tunnel_add of the caller in order to
2984 * supply the listening VXLAN udp ports. Callers are expected
2985 * to implement the ndo_udp_tunnel_add.
2986 */
2987 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2988 {
2989 struct vxlan_sock *vs;
2990 struct net *net = dev_net(dev);
2991 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2992 unsigned int i;
2993
2994 spin_lock(&vn->sock_lock);
2995 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2996 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2997 unsigned short type;
2998
2999 if (vs->flags & VXLAN_F_GPE)
3000 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3001 else
3002 type = UDP_TUNNEL_TYPE_VXLAN;
3003
3004 if (push)
3005 udp_tunnel_push_rx_port(dev, vs->sock, type);
3006 else
3007 udp_tunnel_drop_rx_port(dev, vs->sock, type);
3008 }
3009 }
3010 spin_unlock(&vn->sock_lock);
3011 }
3012
3013 /* Initialize the device structure. */
3014 static void vxlan_setup(struct net_device *dev)
3015 {
3016 struct vxlan_dev *vxlan = netdev_priv(dev);
3017 unsigned int h;
3018
3019 eth_hw_addr_random(dev);
3020 ether_setup(dev);
3021
3022 dev->needs_free_netdev = true;
3023 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3024
3025 dev->features |= NETIF_F_LLTX;
3026 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
3027 dev->features |= NETIF_F_RXCSUM;
3028 dev->features |= NETIF_F_GSO_SOFTWARE;
3029
3030 dev->vlan_features = dev->features;
3031 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
3032 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3033 netif_keep_dst(dev);
3034 dev->priv_flags |= IFF_NO_QUEUE;
3035
3036 /* MTU range: 68 - 65535 */
3037 dev->min_mtu = ETH_MIN_MTU;
3038 dev->max_mtu = ETH_MAX_MTU;
3039
3040 INIT_LIST_HEAD(&vxlan->next);
3041
3042 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3043
3044 vxlan->dev = dev;
3045
3046 gro_cells_init(&vxlan->gro_cells, dev);
3047
3048 for (h = 0; h < FDB_HASH_SIZE; ++h) {
3049 spin_lock_init(&vxlan->hash_lock[h]);
3050 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3051 }
3052 }
3053
3054 static void vxlan_ether_setup(struct net_device *dev)
3055 {
3056 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3057 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3058 dev->netdev_ops = &vxlan_netdev_ether_ops;
3059 }
3060
3061 static void vxlan_raw_setup(struct net_device *dev)
3062 {
3063 dev->header_ops = NULL;
3064 dev->type = ARPHRD_NONE;
3065 dev->hard_header_len = 0;
3066 dev->addr_len = 0;
3067 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3068 dev->netdev_ops = &vxlan_netdev_raw_ops;
3069 }
3070
3071 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3072 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
3073 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
3074 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
3075 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
3076 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
3077 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
3078 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
3079 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
3080 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
3081 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
3082 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
3083 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
3084 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
3085 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
3086 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
3087 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
3088 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
3089 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
3090 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
3091 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
3092 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
3093 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
3094 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
3095 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3096 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
3097 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
3098 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
3099 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
3100 [IFLA_VXLAN_DF] = { .type = NLA_U8 },
3101 };
3102
3103 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3104 struct netlink_ext_ack *extack)
3105 {
3106 if (tb[IFLA_ADDRESS]) {
3107 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3108 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3109 "Provided link layer address is not Ethernet");
3110 return -EINVAL;
3111 }
3112
3113 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3114 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3115 "Provided Ethernet address is not unicast");
3116 return -EADDRNOTAVAIL;
3117 }
3118 }
3119
3120 if (tb[IFLA_MTU]) {
3121 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3122
3123 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3124 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3125 "MTU must be between 68 and 65535");
3126 return -EINVAL;
3127 }
3128 }
3129
3130 if (!data) {
3131 NL_SET_ERR_MSG(extack,
3132 "Required attributes not provided to perform the operation");
3133 return -EINVAL;
3134 }
3135
3136 if (data[IFLA_VXLAN_ID]) {
3137 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3138
3139 if (id >= VXLAN_N_VID) {
3140 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
3141 "VXLAN ID must be lower than 16777216");
3142 return -ERANGE;
3143 }
3144 }
3145
3146 if (data[IFLA_VXLAN_PORT_RANGE]) {
3147 const struct ifla_vxlan_port_range *p
3148 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3149
3150 if (ntohs(p->high) < ntohs(p->low)) {
3151 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
3152 "Invalid source port range");
3153 return -EINVAL;
3154 }
3155 }
3156
3157 if (data[IFLA_VXLAN_DF]) {
3158 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3159
3160 if (df < 0 || df > VXLAN_DF_MAX) {
3161 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_DF],
3162 "Invalid DF attribute");
3163 return -EINVAL;
3164 }
3165 }
3166
3167 return 0;
3168 }
3169
3170 static void vxlan_get_drvinfo(struct net_device *netdev,
3171 struct ethtool_drvinfo *drvinfo)
3172 {
3173 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3174 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3175 }
3176
3177 static const struct ethtool_ops vxlan_ethtool_ops = {
3178 .get_drvinfo = vxlan_get_drvinfo,
3179 .get_link = ethtool_op_get_link,
3180 };
3181
3182 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3183 __be16 port, u32 flags, int ifindex)
3184 {
3185 struct socket *sock;
3186 struct udp_port_cfg udp_conf;
3187 int err;
3188
3189 memset(&udp_conf, 0, sizeof(udp_conf));
3190
3191 if (ipv6) {
3192 udp_conf.family = AF_INET6;
3193 udp_conf.use_udp6_rx_checksums =
3194 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3195 udp_conf.ipv6_v6only = 1;
3196 } else {
3197 udp_conf.family = AF_INET;
3198 }
3199
3200 udp_conf.local_udp_port = port;
3201 udp_conf.bind_ifindex = ifindex;
3202
3203 /* Open UDP socket */
3204 err = udp_sock_create(net, &udp_conf, &sock);
3205 if (err < 0)
3206 return ERR_PTR(err);
3207
3208 return sock;
3209 }
3210
3211 /* Create new listen socket if needed */
3212 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3213 __be16 port, u32 flags,
3214 int ifindex)
3215 {
3216 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3217 struct vxlan_sock *vs;
3218 struct socket *sock;
3219 unsigned int h;
3220 struct udp_tunnel_sock_cfg tunnel_cfg;
3221
3222 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3223 if (!vs)
3224 return ERR_PTR(-ENOMEM);
3225
3226 for (h = 0; h < VNI_HASH_SIZE; ++h)
3227 INIT_HLIST_HEAD(&vs->vni_list[h]);
3228
3229 sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3230 if (IS_ERR(sock)) {
3231 kfree(vs);
3232 return ERR_CAST(sock);
3233 }
3234
3235 vs->sock = sock;
3236 refcount_set(&vs->refcnt, 1);
3237 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3238
3239 spin_lock(&vn->sock_lock);
3240 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3241 udp_tunnel_notify_add_rx_port(sock,
3242 (vs->flags & VXLAN_F_GPE) ?
3243 UDP_TUNNEL_TYPE_VXLAN_GPE :
3244 UDP_TUNNEL_TYPE_VXLAN);
3245 spin_unlock(&vn->sock_lock);
3246
3247 /* Mark socket as an encapsulation socket. */
3248 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3249 tunnel_cfg.sk_user_data = vs;
3250 tunnel_cfg.encap_type = 1;
3251 tunnel_cfg.encap_rcv = vxlan_rcv;
3252 tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3253 tunnel_cfg.encap_destroy = NULL;
3254 tunnel_cfg.gro_receive = vxlan_gro_receive;
3255 tunnel_cfg.gro_complete = vxlan_gro_complete;
3256
3257 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3258
3259 return vs;
3260 }
3261
3262 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3263 {
3264 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3265 struct vxlan_sock *vs = NULL;
3266 struct vxlan_dev_node *node;
3267 int l3mdev_index = 0;
3268
3269 if (vxlan->cfg.remote_ifindex)
3270 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3271 vxlan->net, vxlan->cfg.remote_ifindex);
3272
3273 if (!vxlan->cfg.no_share) {
3274 spin_lock(&vn->sock_lock);
3275 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3276 vxlan->cfg.dst_port, vxlan->cfg.flags,
3277 l3mdev_index);
3278 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3279 spin_unlock(&vn->sock_lock);
3280 return -EBUSY;
3281 }
3282 spin_unlock(&vn->sock_lock);
3283 }
3284 if (!vs)
3285 vs = vxlan_socket_create(vxlan->net, ipv6,
3286 vxlan->cfg.dst_port, vxlan->cfg.flags,
3287 l3mdev_index);
3288 if (IS_ERR(vs))
3289 return PTR_ERR(vs);
3290 #if IS_ENABLED(CONFIG_IPV6)
3291 if (ipv6) {
3292 rcu_assign_pointer(vxlan->vn6_sock, vs);
3293 node = &vxlan->hlist6;
3294 } else
3295 #endif
3296 {
3297 rcu_assign_pointer(vxlan->vn4_sock, vs);
3298 node = &vxlan->hlist4;
3299 }
3300 vxlan_vs_add_dev(vs, vxlan, node);
3301 return 0;
3302 }
3303
3304 static int vxlan_sock_add(struct vxlan_dev *vxlan)
3305 {
3306 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3307 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3308 bool ipv4 = !ipv6 || metadata;
3309 int ret = 0;
3310
3311 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3312 #if IS_ENABLED(CONFIG_IPV6)
3313 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3314 if (ipv6) {
3315 ret = __vxlan_sock_add(vxlan, true);
3316 if (ret < 0 && ret != -EAFNOSUPPORT)
3317 ipv4 = false;
3318 }
3319 #endif
3320 if (ipv4)
3321 ret = __vxlan_sock_add(vxlan, false);
3322 if (ret < 0)
3323 vxlan_sock_release(vxlan);
3324 return ret;
3325 }
3326
3327 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3328 struct net_device **lower,
3329 struct vxlan_dev *old,
3330 struct netlink_ext_ack *extack)
3331 {
3332 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3333 struct vxlan_dev *tmp;
3334 bool use_ipv6 = false;
3335
3336 if (conf->flags & VXLAN_F_GPE) {
3337 /* For now, allow GPE only together with
3338 * COLLECT_METADATA. This can be relaxed later; in such
3339 * case, the other side of the PtP link will have to be
3340 * provided.
3341 */
3342 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3343 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3344 NL_SET_ERR_MSG(extack,
3345 "VXLAN GPE does not support this combination of attributes");
3346 return -EINVAL;
3347 }
3348 }
3349
3350 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3351 /* Unless IPv6 is explicitly requested, assume IPv4 */
3352 conf->remote_ip.sa.sa_family = AF_INET;
3353 conf->saddr.sa.sa_family = AF_INET;
3354 } else if (!conf->remote_ip.sa.sa_family) {
3355 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3356 } else if (!conf->saddr.sa.sa_family) {
3357 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3358 }
3359
3360 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3361 NL_SET_ERR_MSG(extack,
3362 "Local and remote address must be from the same family");
3363 return -EINVAL;
3364 }
3365
3366 if (vxlan_addr_multicast(&conf->saddr)) {
3367 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3368 return -EINVAL;
3369 }
3370
3371 if (conf->saddr.sa.sa_family == AF_INET6) {
3372 if (!IS_ENABLED(CONFIG_IPV6)) {
3373 NL_SET_ERR_MSG(extack,
3374 "IPv6 support not enabled in the kernel");
3375 return -EPFNOSUPPORT;
3376 }
3377 use_ipv6 = true;
3378 conf->flags |= VXLAN_F_IPV6;
3379
3380 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3381 int local_type =
3382 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3383 int remote_type =
3384 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3385
3386 if (local_type & IPV6_ADDR_LINKLOCAL) {
3387 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3388 (remote_type != IPV6_ADDR_ANY)) {
3389 NL_SET_ERR_MSG(extack,
3390 "Invalid combination of local and remote address scopes");
3391 return -EINVAL;
3392 }
3393
3394 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3395 } else {
3396 if (remote_type ==
3397 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3398 NL_SET_ERR_MSG(extack,
3399 "Invalid combination of local and remote address scopes");
3400 return -EINVAL;
3401 }
3402
3403 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3404 }
3405 }
3406 }
3407
3408 if (conf->label && !use_ipv6) {
3409 NL_SET_ERR_MSG(extack,
3410 "Label attribute only applies to IPv6 VXLAN devices");
3411 return -EINVAL;
3412 }
3413
3414 if (conf->remote_ifindex) {
3415 struct net_device *lowerdev;
3416
3417 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3418 if (!lowerdev) {
3419 NL_SET_ERR_MSG(extack,
3420 "Invalid local interface, device not found");
3421 return -ENODEV;
3422 }
3423
3424 #if IS_ENABLED(CONFIG_IPV6)
3425 if (use_ipv6) {
3426 struct inet6_dev *idev = __in6_dev_get(lowerdev);
3427 if (idev && idev->cnf.disable_ipv6) {
3428 NL_SET_ERR_MSG(extack,
3429 "IPv6 support disabled by administrator");
3430 return -EPERM;
3431 }
3432 }
3433 #endif
3434
3435 *lower = lowerdev;
3436 } else {
3437 if (vxlan_addr_multicast(&conf->remote_ip)) {
3438 NL_SET_ERR_MSG(extack,
3439 "Local interface required for multicast remote destination");
3440
3441 return -EINVAL;
3442 }
3443
3444 #if IS_ENABLED(CONFIG_IPV6)
3445 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3446 NL_SET_ERR_MSG(extack,
3447 "Local interface required for link-local local/remote addresses");
3448 return -EINVAL;
3449 }
3450 #endif
3451
3452 *lower = NULL;
3453 }
3454
3455 if (!conf->dst_port) {
3456 if (conf->flags & VXLAN_F_GPE)
3457 conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3458 else
3459 conf->dst_port = htons(vxlan_port);
3460 }
3461
3462 if (!conf->age_interval)
3463 conf->age_interval = FDB_AGE_DEFAULT;
3464
3465 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3466 if (tmp == old)
3467 continue;
3468
3469 if (tmp->cfg.vni != conf->vni)
3470 continue;
3471 if (tmp->cfg.dst_port != conf->dst_port)
3472 continue;
3473 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3474 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3475 continue;
3476
3477 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3478 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3479 continue;
3480
3481 NL_SET_ERR_MSG(extack,
3482 "A VXLAN device with the specified VNI already exists");
3483 return -EEXIST;
3484 }
3485
3486 return 0;
3487 }
3488
3489 static void vxlan_config_apply(struct net_device *dev,
3490 struct vxlan_config *conf,
3491 struct net_device *lowerdev,
3492 struct net *src_net,
3493 bool changelink)
3494 {
3495 struct vxlan_dev *vxlan = netdev_priv(dev);
3496 struct vxlan_rdst *dst = &vxlan->default_dst;
3497 unsigned short needed_headroom = ETH_HLEN;
3498 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3499 int max_mtu = ETH_MAX_MTU;
3500
3501 if (!changelink) {
3502 if (conf->flags & VXLAN_F_GPE)
3503 vxlan_raw_setup(dev);
3504 else
3505 vxlan_ether_setup(dev);
3506
3507 if (conf->mtu)
3508 dev->mtu = conf->mtu;
3509
3510 vxlan->net = src_net;
3511 }
3512
3513 dst->remote_vni = conf->vni;
3514
3515 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3516
3517 if (lowerdev) {
3518 dst->remote_ifindex = conf->remote_ifindex;
3519
3520 dev->gso_max_size = lowerdev->gso_max_size;
3521 dev->gso_max_segs = lowerdev->gso_max_segs;
3522
3523 needed_headroom = lowerdev->hard_header_len;
3524
3525 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3526 VXLAN_HEADROOM);
3527 if (max_mtu < ETH_MIN_MTU)
3528 max_mtu = ETH_MIN_MTU;
3529
3530 if (!changelink && !conf->mtu)
3531 dev->mtu = max_mtu;
3532 }
3533
3534 if (dev->mtu > max_mtu)
3535 dev->mtu = max_mtu;
3536
3537 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3538 needed_headroom += VXLAN6_HEADROOM;
3539 else
3540 needed_headroom += VXLAN_HEADROOM;
3541 dev->needed_headroom = needed_headroom;
3542
3543 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3544 }
3545
3546 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3547 struct vxlan_config *conf, bool changelink,
3548 struct netlink_ext_ack *extack)
3549 {
3550 struct vxlan_dev *vxlan = netdev_priv(dev);
3551 struct net_device *lowerdev;
3552 int ret;
3553
3554 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3555 if (ret)
3556 return ret;
3557
3558 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3559
3560 return 0;
3561 }
3562
3563 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3564 struct vxlan_config *conf,
3565 struct netlink_ext_ack *extack)
3566 {
3567 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3568 struct vxlan_dev *vxlan = netdev_priv(dev);
3569 struct vxlan_fdb *f = NULL;
3570 bool unregister = false;
3571 int err;
3572
3573 err = vxlan_dev_configure(net, dev, conf, false, extack);
3574 if (err)
3575 return err;
3576
3577 dev->ethtool_ops = &vxlan_ethtool_ops;
3578
3579 /* create an fdb entry for a valid default destination */
3580 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3581 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3582 &vxlan->default_dst.remote_ip,
3583 NUD_REACHABLE | NUD_PERMANENT,
3584 vxlan->cfg.dst_port,
3585 vxlan->default_dst.remote_vni,
3586 vxlan->default_dst.remote_vni,
3587 vxlan->default_dst.remote_ifindex,
3588 NTF_SELF, &f);
3589 if (err)
3590 return err;
3591 }
3592
3593 err = register_netdevice(dev);
3594 if (err)
3595 goto errout;
3596 unregister = true;
3597
3598 err = rtnl_configure_link(dev, NULL);
3599 if (err)
3600 goto errout;
3601
3602 if (f) {
3603 vxlan_fdb_insert(vxlan, all_zeros_mac,
3604 vxlan->default_dst.remote_vni, f);
3605
3606 /* notify default fdb entry */
3607 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
3608 RTM_NEWNEIGH, true, extack);
3609 if (err) {
3610 vxlan_fdb_destroy(vxlan, f, false, false);
3611 goto unregister;
3612 }
3613 }
3614
3615 list_add(&vxlan->next, &vn->vxlan_list);
3616 return 0;
3617
3618 errout:
3619 /* unregister_netdevice() destroys the default FDB entry with deletion
3620 * notification. But the addition notification was not sent yet, so
3621 * destroy the entry by hand here.
3622 */
3623 if (f)
3624 __vxlan_fdb_free(f);
3625 unregister:
3626 if (unregister)
3627 unregister_netdevice(dev);
3628 return err;
3629 }
3630
3631 /* Set/clear flags based on attribute */
3632 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
3633 int attrtype, unsigned long mask, bool changelink,
3634 bool changelink_supported,
3635 struct netlink_ext_ack *extack)
3636 {
3637 unsigned long flags;
3638
3639 if (!tb[attrtype])
3640 return 0;
3641
3642 if (changelink && !changelink_supported) {
3643 vxlan_flag_attr_error(attrtype, extack);
3644 return -EOPNOTSUPP;
3645 }
3646
3647 if (vxlan_policy[attrtype].type == NLA_FLAG)
3648 flags = conf->flags | mask;
3649 else if (nla_get_u8(tb[attrtype]))
3650 flags = conf->flags | mask;
3651 else
3652 flags = conf->flags & ~mask;
3653
3654 conf->flags = flags;
3655
3656 return 0;
3657 }
3658
3659 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3660 struct net_device *dev, struct vxlan_config *conf,
3661 bool changelink, struct netlink_ext_ack *extack)
3662 {
3663 struct vxlan_dev *vxlan = netdev_priv(dev);
3664 int err = 0;
3665
3666 memset(conf, 0, sizeof(*conf));
3667
3668 /* if changelink operation, start with old existing cfg */
3669 if (changelink)
3670 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3671
3672 if (data[IFLA_VXLAN_ID]) {
3673 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3674
3675 if (changelink && (vni != conf->vni)) {
3676 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
3677 return -EOPNOTSUPP;
3678 }
3679 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3680 }
3681
3682 if (data[IFLA_VXLAN_GROUP]) {
3683 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
3684 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
3685 return -EOPNOTSUPP;
3686 }
3687
3688 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3689 conf->remote_ip.sa.sa_family = AF_INET;
3690 } else if (data[IFLA_VXLAN_GROUP6]) {
3691 if (!IS_ENABLED(CONFIG_IPV6)) {
3692 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
3693 return -EPFNOSUPPORT;
3694 }
3695
3696 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
3697 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
3698 return -EOPNOTSUPP;
3699 }
3700
3701 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3702 conf->remote_ip.sa.sa_family = AF_INET6;
3703 }
3704
3705 if (data[IFLA_VXLAN_LOCAL]) {
3706 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
3707 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
3708 return -EOPNOTSUPP;
3709 }
3710
3711 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3712 conf->saddr.sa.sa_family = AF_INET;
3713 } else if (data[IFLA_VXLAN_LOCAL6]) {
3714 if (!IS_ENABLED(CONFIG_IPV6)) {
3715 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
3716 return -EPFNOSUPPORT;
3717 }
3718
3719 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
3720 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
3721 return -EOPNOTSUPP;
3722 }
3723
3724 /* TODO: respect scope id */
3725 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3726 conf->saddr.sa.sa_family = AF_INET6;
3727 }
3728
3729 if (data[IFLA_VXLAN_LINK])
3730 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3731
3732 if (data[IFLA_VXLAN_TOS])
3733 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3734
3735 if (data[IFLA_VXLAN_TTL])
3736 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3737
3738 if (data[IFLA_VXLAN_TTL_INHERIT]) {
3739 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
3740 VXLAN_F_TTL_INHERIT, changelink, false,
3741 extack);
3742 if (err)
3743 return err;
3744
3745 }
3746
3747 if (data[IFLA_VXLAN_LABEL])
3748 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3749 IPV6_FLOWLABEL_MASK;
3750
3751 if (data[IFLA_VXLAN_LEARNING]) {
3752 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
3753 VXLAN_F_LEARN, changelink, true,
3754 extack);
3755 if (err)
3756 return err;
3757 } else if (!changelink) {
3758 /* default to learn on a new device */
3759 conf->flags |= VXLAN_F_LEARN;
3760 }
3761
3762 if (data[IFLA_VXLAN_AGEING])
3763 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3764
3765 if (data[IFLA_VXLAN_PROXY]) {
3766 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
3767 VXLAN_F_PROXY, changelink, false,
3768 extack);
3769 if (err)
3770 return err;
3771 }
3772
3773 if (data[IFLA_VXLAN_RSC]) {
3774 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
3775 VXLAN_F_RSC, changelink, false,
3776 extack);
3777 if (err)
3778 return err;
3779 }
3780
3781 if (data[IFLA_VXLAN_L2MISS]) {
3782 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
3783 VXLAN_F_L2MISS, changelink, false,
3784 extack);
3785 if (err)
3786 return err;
3787 }
3788
3789 if (data[IFLA_VXLAN_L3MISS]) {
3790 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
3791 VXLAN_F_L3MISS, changelink, false,
3792 extack);
3793 if (err)
3794 return err;
3795 }
3796
3797 if (data[IFLA_VXLAN_LIMIT]) {
3798 if (changelink) {
3799 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
3800 "Cannot change limit");
3801 return -EOPNOTSUPP;
3802 }
3803 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3804 }
3805
3806 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3807 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
3808 VXLAN_F_COLLECT_METADATA, changelink, false,
3809 extack);
3810 if (err)
3811 return err;
3812 }
3813
3814 if (data[IFLA_VXLAN_PORT_RANGE]) {
3815 if (!changelink) {
3816 const struct ifla_vxlan_port_range *p
3817 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3818 conf->port_min = ntohs(p->low);
3819 conf->port_max = ntohs(p->high);
3820 } else {
3821 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
3822 "Cannot change port range");
3823 return -EOPNOTSUPP;
3824 }
3825 }
3826
3827 if (data[IFLA_VXLAN_PORT]) {
3828 if (changelink) {
3829 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
3830 "Cannot change port");
3831 return -EOPNOTSUPP;
3832 }
3833 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3834 }
3835
3836 if (data[IFLA_VXLAN_UDP_CSUM]) {
3837 if (changelink) {
3838 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
3839 "Cannot change UDP_CSUM flag");
3840 return -EOPNOTSUPP;
3841 }
3842 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3843 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3844 }
3845
3846 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3847 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3848 VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
3849 false, extack);
3850 if (err)
3851 return err;
3852 }
3853
3854 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3855 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3856 VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
3857 false, extack);
3858 if (err)
3859 return err;
3860 }
3861
3862 if (data[IFLA_VXLAN_REMCSUM_TX]) {
3863 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
3864 VXLAN_F_REMCSUM_TX, changelink, false,
3865 extack);
3866 if (err)
3867 return err;
3868 }
3869
3870 if (data[IFLA_VXLAN_REMCSUM_RX]) {
3871 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
3872 VXLAN_F_REMCSUM_RX, changelink, false,
3873 extack);
3874 if (err)
3875 return err;
3876 }
3877
3878 if (data[IFLA_VXLAN_GBP]) {
3879 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
3880 VXLAN_F_GBP, changelink, false, extack);
3881 if (err)
3882 return err;
3883 }
3884
3885 if (data[IFLA_VXLAN_GPE]) {
3886 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
3887 VXLAN_F_GPE, changelink, false,
3888 extack);
3889 if (err)
3890 return err;
3891 }
3892
3893 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3894 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
3895 VXLAN_F_REMCSUM_NOPARTIAL, changelink,
3896 false, extack);
3897 if (err)
3898 return err;
3899 }
3900
3901 if (tb[IFLA_MTU]) {
3902 if (changelink) {
3903 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3904 "Cannot change mtu");
3905 return -EOPNOTSUPP;
3906 }
3907 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3908 }
3909
3910 if (data[IFLA_VXLAN_DF])
3911 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
3912
3913 return 0;
3914 }
3915
3916 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3917 struct nlattr *tb[], struct nlattr *data[],
3918 struct netlink_ext_ack *extack)
3919 {
3920 struct vxlan_config conf;
3921 int err;
3922
3923 err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
3924 if (err)
3925 return err;
3926
3927 return __vxlan_dev_create(src_net, dev, &conf, extack);
3928 }
3929
3930 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3931 struct nlattr *data[],
3932 struct netlink_ext_ack *extack)
3933 {
3934 struct vxlan_dev *vxlan = netdev_priv(dev);
3935 struct vxlan_rdst *dst = &vxlan->default_dst;
3936 struct net_device *lowerdev;
3937 struct vxlan_config conf;
3938 int err;
3939
3940 err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
3941 if (err)
3942 return err;
3943
3944 err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
3945 vxlan, extack);
3946 if (err)
3947 return err;
3948
3949 /* handle default dst entry */
3950 if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
3951 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
3952
3953 spin_lock_bh(&vxlan->hash_lock[hash_index]);
3954 if (!vxlan_addr_any(&conf.remote_ip)) {
3955 err = vxlan_fdb_update(vxlan, all_zeros_mac,
3956 &conf.remote_ip,
3957 NUD_REACHABLE | NUD_PERMANENT,
3958 NLM_F_APPEND | NLM_F_CREATE,
3959 vxlan->cfg.dst_port,
3960 conf.vni, conf.vni,
3961 conf.remote_ifindex,
3962 NTF_SELF, true, extack);
3963 if (err) {
3964 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
3965 return err;
3966 }
3967 }
3968 if (!vxlan_addr_any(&dst->remote_ip))
3969 __vxlan_fdb_delete(vxlan, all_zeros_mac,
3970 dst->remote_ip,
3971 vxlan->cfg.dst_port,
3972 dst->remote_vni,
3973 dst->remote_vni,
3974 dst->remote_ifindex,
3975 true);
3976 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
3977 }
3978
3979 if (conf.age_interval != vxlan->cfg.age_interval)
3980 mod_timer(&vxlan->age_timer, jiffies);
3981
3982 vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
3983 return 0;
3984 }
3985
3986 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3987 {
3988 struct vxlan_dev *vxlan = netdev_priv(dev);
3989
3990 vxlan_flush(vxlan, true);
3991
3992 list_del(&vxlan->next);
3993 unregister_netdevice_queue(dev, head);
3994 }
3995
3996 static size_t vxlan_get_size(const struct net_device *dev)
3997 {
3998
3999 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
4000 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4001 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
4002 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4003 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
4004 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */
4005 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
4006 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */
4007 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4008 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
4009 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
4010 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
4011 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
4012 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
4013 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
4014 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
4015 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
4016 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4017 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4018 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4019 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4020 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4021 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4022 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4023 0;
4024 }
4025
4026 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4027 {
4028 const struct vxlan_dev *vxlan = netdev_priv(dev);
4029 const struct vxlan_rdst *dst = &vxlan->default_dst;
4030 struct ifla_vxlan_port_range ports = {
4031 .low = htons(vxlan->cfg.port_min),
4032 .high = htons(vxlan->cfg.port_max),
4033 };
4034
4035 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4036 goto nla_put_failure;
4037
4038 if (!vxlan_addr_any(&dst->remote_ip)) {
4039 if (dst->remote_ip.sa.sa_family == AF_INET) {
4040 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4041 dst->remote_ip.sin.sin_addr.s_addr))
4042 goto nla_put_failure;
4043 #if IS_ENABLED(CONFIG_IPV6)
4044 } else {
4045 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4046 &dst->remote_ip.sin6.sin6_addr))
4047 goto nla_put_failure;
4048 #endif
4049 }
4050 }
4051
4052 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4053 goto nla_put_failure;
4054
4055 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4056 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4057 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4058 vxlan->cfg.saddr.sin.sin_addr.s_addr))
4059 goto nla_put_failure;
4060 #if IS_ENABLED(CONFIG_IPV6)
4061 } else {
4062 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4063 &vxlan->cfg.saddr.sin6.sin6_addr))
4064 goto nla_put_failure;
4065 #endif
4066 }
4067 }
4068
4069 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4070 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4071 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4072 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4073 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4074 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4075 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4076 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4077 nla_put_u8(skb, IFLA_VXLAN_PROXY,
4078 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4079 nla_put_u8(skb, IFLA_VXLAN_RSC,
4080 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4081 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4082 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4083 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4084 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4085 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4086 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4087 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4088 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4089 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4090 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4091 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4092 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4093 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4094 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4095 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4096 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4097 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4098 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4099 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
4100 goto nla_put_failure;
4101
4102 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4103 goto nla_put_failure;
4104
4105 if (vxlan->cfg.flags & VXLAN_F_GBP &&
4106 nla_put_flag(skb, IFLA_VXLAN_GBP))
4107 goto nla_put_failure;
4108
4109 if (vxlan->cfg.flags & VXLAN_F_GPE &&
4110 nla_put_flag(skb, IFLA_VXLAN_GPE))
4111 goto nla_put_failure;
4112
4113 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4114 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4115 goto nla_put_failure;
4116
4117 return 0;
4118
4119 nla_put_failure:
4120 return -EMSGSIZE;
4121 }
4122
4123 static struct net *vxlan_get_link_net(const struct net_device *dev)
4124 {
4125 struct vxlan_dev *vxlan = netdev_priv(dev);
4126
4127 return vxlan->net;
4128 }
4129
4130 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4131 .kind = "vxlan",
4132 .maxtype = IFLA_VXLAN_MAX,
4133 .policy = vxlan_policy,
4134 .priv_size = sizeof(struct vxlan_dev),
4135 .setup = vxlan_setup,
4136 .validate = vxlan_validate,
4137 .newlink = vxlan_newlink,
4138 .changelink = vxlan_changelink,
4139 .dellink = vxlan_dellink,
4140 .get_size = vxlan_get_size,
4141 .fill_info = vxlan_fill_info,
4142 .get_link_net = vxlan_get_link_net,
4143 };
4144
4145 struct net_device *vxlan_dev_create(struct net *net, const char *name,
4146 u8 name_assign_type,
4147 struct vxlan_config *conf)
4148 {
4149 struct nlattr *tb[IFLA_MAX + 1];
4150 struct net_device *dev;
4151 int err;
4152
4153 memset(&tb, 0, sizeof(tb));
4154
4155 dev = rtnl_create_link(net, name, name_assign_type,
4156 &vxlan_link_ops, tb, NULL);
4157 if (IS_ERR(dev))
4158 return dev;
4159
4160 err = __vxlan_dev_create(net, dev, conf, NULL);
4161 if (err < 0) {
4162 free_netdev(dev);
4163 return ERR_PTR(err);
4164 }
4165
4166 err = rtnl_configure_link(dev, NULL);
4167 if (err < 0) {
4168 LIST_HEAD(list_kill);
4169
4170 vxlan_dellink(dev, &list_kill);
4171 unregister_netdevice_many(&list_kill);
4172 return ERR_PTR(err);
4173 }
4174
4175 return dev;
4176 }
4177 EXPORT_SYMBOL_GPL(vxlan_dev_create);
4178
4179 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4180 struct net_device *dev)
4181 {
4182 struct vxlan_dev *vxlan, *next;
4183 LIST_HEAD(list_kill);
4184
4185 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4186 struct vxlan_rdst *dst = &vxlan->default_dst;
4187
4188 /* In case we created vxlan device with carrier
4189 * and we loose the carrier due to module unload
4190 * we also need to remove vxlan device. In other
4191 * cases, it's not necessary and remote_ifindex
4192 * is 0 here, so no matches.
4193 */
4194 if (dst->remote_ifindex == dev->ifindex)
4195 vxlan_dellink(vxlan->dev, &list_kill);
4196 }
4197
4198 unregister_netdevice_many(&list_kill);
4199 }
4200
4201 static int vxlan_netdevice_event(struct notifier_block *unused,
4202 unsigned long event, void *ptr)
4203 {
4204 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4205 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4206
4207 if (event == NETDEV_UNREGISTER) {
4208 vxlan_offload_rx_ports(dev, false);
4209 vxlan_handle_lowerdev_unregister(vn, dev);
4210 } else if (event == NETDEV_REGISTER) {
4211 vxlan_offload_rx_ports(dev, true);
4212 } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
4213 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
4214 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
4215 }
4216
4217 return NOTIFY_DONE;
4218 }
4219
4220 static struct notifier_block vxlan_notifier_block __read_mostly = {
4221 .notifier_call = vxlan_netdevice_event,
4222 };
4223
4224 static void
4225 vxlan_fdb_offloaded_set(struct net_device *dev,
4226 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4227 {
4228 struct vxlan_dev *vxlan = netdev_priv(dev);
4229 struct vxlan_rdst *rdst;
4230 struct vxlan_fdb *f;
4231 u32 hash_index;
4232
4233 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4234
4235 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4236
4237 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4238 if (!f)
4239 goto out;
4240
4241 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4242 fdb_info->remote_port,
4243 fdb_info->remote_vni,
4244 fdb_info->remote_ifindex);
4245 if (!rdst)
4246 goto out;
4247
4248 rdst->offloaded = fdb_info->offloaded;
4249
4250 out:
4251 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4252 }
4253
4254 static int
4255 vxlan_fdb_external_learn_add(struct net_device *dev,
4256 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4257 {
4258 struct vxlan_dev *vxlan = netdev_priv(dev);
4259 struct netlink_ext_ack *extack;
4260 u32 hash_index;
4261 int err;
4262
4263 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4264 extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4265
4266 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4267 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4268 NUD_REACHABLE,
4269 NLM_F_CREATE | NLM_F_REPLACE,
4270 fdb_info->remote_port,
4271 fdb_info->vni,
4272 fdb_info->remote_vni,
4273 fdb_info->remote_ifindex,
4274 NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4275 false, extack);
4276 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4277
4278 return err;
4279 }
4280
4281 static int
4282 vxlan_fdb_external_learn_del(struct net_device *dev,
4283 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4284 {
4285 struct vxlan_dev *vxlan = netdev_priv(dev);
4286 struct vxlan_fdb *f;
4287 u32 hash_index;
4288 int err = 0;
4289
4290 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4291 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4292
4293 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4294 if (!f)
4295 err = -ENOENT;
4296 else if (f->flags & NTF_EXT_LEARNED)
4297 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4298 fdb_info->remote_ip,
4299 fdb_info->remote_port,
4300 fdb_info->vni,
4301 fdb_info->remote_vni,
4302 fdb_info->remote_ifindex,
4303 false);
4304
4305 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4306
4307 return err;
4308 }
4309
4310 static int vxlan_switchdev_event(struct notifier_block *unused,
4311 unsigned long event, void *ptr)
4312 {
4313 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4314 struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4315 int err = 0;
4316
4317 switch (event) {
4318 case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4319 vxlan_fdb_offloaded_set(dev, ptr);
4320 break;
4321 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4322 fdb_info = ptr;
4323 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4324 if (err) {
4325 err = notifier_from_errno(err);
4326 break;
4327 }
4328 fdb_info->offloaded = true;
4329 vxlan_fdb_offloaded_set(dev, fdb_info);
4330 break;
4331 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4332 fdb_info = ptr;
4333 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4334 if (err) {
4335 err = notifier_from_errno(err);
4336 break;
4337 }
4338 fdb_info->offloaded = false;
4339 vxlan_fdb_offloaded_set(dev, fdb_info);
4340 break;
4341 }
4342
4343 return err;
4344 }
4345
4346 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4347 .notifier_call = vxlan_switchdev_event,
4348 };
4349
4350 static __net_init int vxlan_init_net(struct net *net)
4351 {
4352 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4353 unsigned int h;
4354
4355 INIT_LIST_HEAD(&vn->vxlan_list);
4356 spin_lock_init(&vn->sock_lock);
4357
4358 for (h = 0; h < PORT_HASH_SIZE; ++h)
4359 INIT_HLIST_HEAD(&vn->sock_list[h]);
4360
4361 return 0;
4362 }
4363
4364 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
4365 {
4366 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4367 struct vxlan_dev *vxlan, *next;
4368 struct net_device *dev, *aux;
4369 unsigned int h;
4370
4371 for_each_netdev_safe(net, dev, aux)
4372 if (dev->rtnl_link_ops == &vxlan_link_ops)
4373 unregister_netdevice_queue(dev, head);
4374
4375 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4376 /* If vxlan->dev is in the same netns, it has already been added
4377 * to the list by the previous loop.
4378 */
4379 if (!net_eq(dev_net(vxlan->dev), net))
4380 unregister_netdevice_queue(vxlan->dev, head);
4381 }
4382
4383 for (h = 0; h < PORT_HASH_SIZE; ++h)
4384 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4385 }
4386
4387 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
4388 {
4389 struct net *net;
4390 LIST_HEAD(list);
4391
4392 rtnl_lock();
4393 list_for_each_entry(net, net_list, exit_list)
4394 vxlan_destroy_tunnels(net, &list);
4395
4396 unregister_netdevice_many(&list);
4397 rtnl_unlock();
4398 }
4399
4400 static struct pernet_operations vxlan_net_ops = {
4401 .init = vxlan_init_net,
4402 .exit_batch = vxlan_exit_batch_net,
4403 .id = &vxlan_net_id,
4404 .size = sizeof(struct vxlan_net),
4405 };
4406
4407 static int __init vxlan_init_module(void)
4408 {
4409 int rc;
4410
4411 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4412
4413 rc = register_pernet_subsys(&vxlan_net_ops);
4414 if (rc)
4415 goto out1;
4416
4417 rc = register_netdevice_notifier(&vxlan_notifier_block);
4418 if (rc)
4419 goto out2;
4420
4421 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4422 if (rc)
4423 goto out3;
4424
4425 rc = rtnl_link_register(&vxlan_link_ops);
4426 if (rc)
4427 goto out4;
4428
4429 return 0;
4430 out4:
4431 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4432 out3:
4433 unregister_netdevice_notifier(&vxlan_notifier_block);
4434 out2:
4435 unregister_pernet_subsys(&vxlan_net_ops);
4436 out1:
4437 return rc;
4438 }
4439 late_initcall(vxlan_init_module);
4440
4441 static void __exit vxlan_cleanup_module(void)
4442 {
4443 rtnl_link_unregister(&vxlan_link_ops);
4444 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4445 unregister_netdevice_notifier(&vxlan_notifier_block);
4446 unregister_pernet_subsys(&vxlan_net_ops);
4447 /* rcu_barrier() is called by netns */
4448 }
4449 module_exit(vxlan_cleanup_module);
4450
4451 MODULE_LICENSE("GPL");
4452 MODULE_VERSION(VXLAN_VERSION);
4453 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
4454 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4455 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux with added FPC-III support