1/*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/errno.h>
16#include <linux/slab.h>
17#include <linux/udp.h>
18#include <linux/igmp.h>
19#include <linux/if_ether.h>
20#include <linux/ethtool.h>
21#include <net/arp.h>
22#include <net/ndisc.h>
23#include <net/ip.h>
24#include <net/icmp.h>
25#include <net/rtnetlink.h>
26#include <net/inet_ecn.h>
27#include <net/net_namespace.h>
28#include <net/netns/generic.h>
29#include <net/tun_proto.h>
30#include <net/vxlan.h>
31
32#if IS_ENABLED(CONFIG_IPV6)
33#include <net/ip6_tunnel.h>
34#include <net/ip6_checksum.h>
35#endif
36
37#define VXLAN_VERSION "0.1"
38
39#define PORT_HASH_BITS 8
40#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
41#define FDB_AGE_DEFAULT 300 /* 5 min */
42#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
43
44/* UDP port for VXLAN traffic.
45 * The IANA assigned port is 4789, but the Linux default is 8472
46 * for compatibility with early adopters.
47 */
48static unsigned short vxlan_port __read_mostly = 8472;
49module_param_named(udp_port, vxlan_port, ushort, 0444);
50MODULE_PARM_DESC(udp_port, "Destination UDP port");
51
52static bool log_ecn_error = true;
53module_param(log_ecn_error, bool, 0644);
54MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
55
56static unsigned int vxlan_net_id;
57static struct rtnl_link_ops vxlan_link_ops;
58
59static const u8 all_zeros_mac[ETH_ALEN + 2];
60
61static int vxlan_sock_add(struct vxlan_dev *vxlan);
62
63static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
64
65/* per-network namespace private data for this module */
66struct vxlan_net {
67 struct list_head vxlan_list;
68 struct hlist_head sock_list[PORT_HASH_SIZE];
69 spinlock_t sock_lock;
70};
71
72/* Forwarding table entry */
73struct vxlan_fdb {
74 struct hlist_node hlist; /* linked list of entries */
75 struct rcu_head rcu;
76 unsigned long updated; /* jiffies */
77 unsigned long used;
78 struct list_head remotes;
79 u8 eth_addr[ETH_ALEN];
80 u16 state; /* see ndm_state */
81 __be32 vni;
82 u16 flags; /* see ndm_flags and below */
83};
84
85#define NTF_VXLAN_ADDED_BY_USER 0x100
86
87/* salt for hash table */
88static u32 vxlan_salt __read_mostly;
89
90static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
91{
92 return vs->flags & VXLAN_F_COLLECT_METADATA ||
93 ip_tunnel_collect_metadata();
94}
95
96#if IS_ENABLED(CONFIG_IPV6)
97static inline
98bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
99{
100 if (a->sa.sa_family != b->sa.sa_family)
101 return false;
102 if (a->sa.sa_family == AF_INET6)
103 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
104 else
105 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
106}
107
108static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
109{
110 if (nla_len(nla) >= sizeof(struct in6_addr)) {
111 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
112 ip->sa.sa_family = AF_INET6;
113 return 0;
114 } else if (nla_len(nla) >= sizeof(__be32)) {
115 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
116 ip->sa.sa_family = AF_INET;
117 return 0;
118 } else {
119 return -EAFNOSUPPORT;
120 }
121}
122
123static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
124 const union vxlan_addr *ip)
125{
126 if (ip->sa.sa_family == AF_INET6)
127 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
128 else
129 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
130}
131
132#else /* !CONFIG_IPV6 */
133
134static inline
135bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
136{
137 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
138}
139
140static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
141{
142 if (nla_len(nla) >= sizeof(struct in6_addr)) {
143 return -EAFNOSUPPORT;
144 } else if (nla_len(nla) >= sizeof(__be32)) {
145 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
146 ip->sa.sa_family = AF_INET;
147 return 0;
148 } else {
149 return -EAFNOSUPPORT;
150 }
151}
152
153static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
154 const union vxlan_addr *ip)
155{
156 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
157}
158#endif
159
160/* Virtual Network hash table head */
161static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
162{
163 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
164}
165
166/* Socket hash table head */
167static inline struct hlist_head *vs_head(struct net *net, __be16 port)
168{
169 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
170
171 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
172}
173
174/* First remote destination for a forwarding entry.
175 * Guaranteed to be non-NULL because remotes are never deleted.
176 */
177static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
178{
179 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
180}
181
182static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
183{
184 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
185}
186
187/* Find VXLAN socket based on network namespace, address family and UDP port
188 * and enabled unshareable flags.
189 */
190static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
191 __be16 port, u32 flags, int ifindex)
192{
193 struct vxlan_sock *vs;
194
195 flags &= VXLAN_F_RCV_FLAGS;
196
197 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
198 if (inet_sk(vs->sock->sk)->inet_sport == port &&
199 vxlan_get_sk_family(vs) == family &&
200 vs->flags == flags &&
201 vs->sock->sk->sk_bound_dev_if == ifindex)
202 return vs;
203 }
204 return NULL;
205}
206
207static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
208 __be32 vni)
209{
210 struct vxlan_dev_node *node;
211
212 /* For flow based devices, map all packets to VNI 0 */
213 if (vs->flags & VXLAN_F_COLLECT_METADATA)
214 vni = 0;
215
216 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
217 if (node->vxlan->default_dst.remote_vni != vni)
218 continue;
219
220 if (IS_ENABLED(CONFIG_IPV6)) {
221 const struct vxlan_config *cfg = &node->vxlan->cfg;
222
223 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
224 cfg->remote_ifindex != ifindex)
225 continue;
226 }
227
228 return node->vxlan;
229 }
230
231 return NULL;
232}
233
234/* Look up VNI in a per net namespace table */
235static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
236 __be32 vni, sa_family_t family,
237 __be16 port, u32 flags)
238{
239 struct vxlan_sock *vs;
240
241 vs = vxlan_find_sock(net, family, port, flags, ifindex);
242 if (!vs)
243 return NULL;
244
245 return vxlan_vs_find_vni(vs, ifindex, vni);
246}
247
248/* Fill in neighbour message in skbuff. */
249static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
250 const struct vxlan_fdb *fdb,
251 u32 portid, u32 seq, int type, unsigned int flags,
252 const struct vxlan_rdst *rdst)
253{
254 unsigned long now = jiffies;
255 struct nda_cacheinfo ci;
256 struct nlmsghdr *nlh;
257 struct ndmsg *ndm;
258 bool send_ip, send_eth;
259
260 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
261 if (nlh == NULL)
262 return -EMSGSIZE;
263
264 ndm = nlmsg_data(nlh);
265 memset(ndm, 0, sizeof(*ndm));
266
267 send_eth = send_ip = true;
268
269 if (type == RTM_GETNEIGH) {
270 send_ip = !vxlan_addr_any(&rdst->remote_ip);
271 send_eth = !is_zero_ether_addr(fdb->eth_addr);
272 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
273 } else
274 ndm->ndm_family = AF_BRIDGE;
275 ndm->ndm_state = fdb->state;
276 ndm->ndm_ifindex = vxlan->dev->ifindex;
277 ndm->ndm_flags = fdb->flags;
278 if (rdst->offloaded)
279 ndm->ndm_flags |= NTF_OFFLOADED;
280 ndm->ndm_type = RTN_UNICAST;
281
282 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
283 nla_put_s32(skb, NDA_LINK_NETNSID,
284 peernet2id(dev_net(vxlan->dev), vxlan->net)))
285 goto nla_put_failure;
286
287 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
288 goto nla_put_failure;
289
290 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
291 goto nla_put_failure;
292
293 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
294 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
295 goto nla_put_failure;
296 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
297 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
298 goto nla_put_failure;
299 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
300 nla_put_u32(skb, NDA_SRC_VNI,
301 be32_to_cpu(fdb->vni)))
302 goto nla_put_failure;
303 if (rdst->remote_ifindex &&
304 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
305 goto nla_put_failure;
306
307 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
308 ci.ndm_confirmed = 0;
309 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
310 ci.ndm_refcnt = 0;
311
312 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
313 goto nla_put_failure;
314
315 nlmsg_end(skb, nlh);
316 return 0;
317
318nla_put_failure:
319 nlmsg_cancel(skb, nlh);
320 return -EMSGSIZE;
321}
322
323static inline size_t vxlan_nlmsg_size(void)
324{
325 return NLMSG_ALIGN(sizeof(struct ndmsg))
326 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
327 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
328 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
329 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
330 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
331 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
332 + nla_total_size(sizeof(struct nda_cacheinfo));
333}
334
335static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
336 struct vxlan_rdst *rd, int type)
337{
338 struct net *net = dev_net(vxlan->dev);
339 struct sk_buff *skb;
340 int err = -ENOBUFS;
341
342 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
343 if (skb == NULL)
344 goto errout;
345
346 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
347 if (err < 0) {
348 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
349 WARN_ON(err == -EMSGSIZE);
350 kfree_skb(skb);
351 goto errout;
352 }
353
354 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
355 return;
356errout:
357 if (err < 0)
358 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
359}
360
361static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
362 const struct vxlan_fdb *fdb,
363 const struct vxlan_rdst *rd,
364 struct netlink_ext_ack *extack,
365 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
366{
367 fdb_info->info.dev = vxlan->dev;
368 fdb_info->info.extack = extack;
369 fdb_info->remote_ip = rd->remote_ip;
370 fdb_info->remote_port = rd->remote_port;
371 fdb_info->remote_vni = rd->remote_vni;
372 fdb_info->remote_ifindex = rd->remote_ifindex;
373 memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
374 fdb_info->vni = fdb->vni;
375 fdb_info->offloaded = rd->offloaded;
376 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
377}
378
379static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
380 struct vxlan_fdb *fdb,
381 struct vxlan_rdst *rd,
382 bool adding,
383 struct netlink_ext_ack *extack)
384{
385 struct switchdev_notifier_vxlan_fdb_info info;
386 enum switchdev_notifier_type notifier_type;
387 int ret;
388
389 if (WARN_ON(!rd))
390 return 0;
391
392 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
393 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
394 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
395 ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
396 &info.info, extack);
397 return notifier_to_errno(ret);
398}
399
400static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
401 struct vxlan_rdst *rd, int type, bool swdev_notify,
402 struct netlink_ext_ack *extack)
403{
404 int err;
405
406 if (swdev_notify) {
407 switch (type) {
408 case RTM_NEWNEIGH:
409 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
410 true, extack);
411 if (err)
412 return err;
413 break;
414 case RTM_DELNEIGH:
415 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
416 false, extack);
417 break;
418 }
419 }
420
421 __vxlan_fdb_notify(vxlan, fdb, rd, type);
422 return 0;
423}
424
425static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
426{
427 struct vxlan_dev *vxlan = netdev_priv(dev);
428 struct vxlan_fdb f = {
429 .state = NUD_STALE,
430 };
431 struct vxlan_rdst remote = {
432 .remote_ip = *ipa, /* goes to NDA_DST */
433 .remote_vni = cpu_to_be32(VXLAN_N_VID),
434 };
435
436 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
437}
438
439static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
440{
441 struct vxlan_fdb f = {
442 .state = NUD_STALE,
443 };
444 struct vxlan_rdst remote = { };
445
446 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
447
448 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
449}
450
451/* Hash Ethernet address */
452static u32 eth_hash(const unsigned char *addr)
453{
454 u64 value = get_unaligned((u64 *)addr);
455
456 /* only want 6 bytes */
457#ifdef __BIG_ENDIAN
458 value >>= 16;
459#else
460 value <<= 16;
461#endif
462 return hash_64(value, FDB_HASH_BITS);
463}
464
465static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
466{
467 /* use 1 byte of OUI and 3 bytes of NIC */
468 u32 key = get_unaligned((u32 *)(addr + 2));
469
470 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
471}
472
473/* Hash chain to use given mac address */
474static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
475 const u8 *mac, __be32 vni)
476{
477 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
478 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
479 else
480 return &vxlan->fdb_head[eth_hash(mac)];
481}
482
483/* Look up Ethernet address in forwarding table */
484static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
485 const u8 *mac, __be32 vni)
486{
487 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
488 struct vxlan_fdb *f;
489
490 hlist_for_each_entry_rcu(f, head, hlist) {
491 if (ether_addr_equal(mac, f->eth_addr)) {
492 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
493 if (vni == f->vni)
494 return f;
495 } else {
496 return f;
497 }
498 }
499 }
500
501 return NULL;
502}
503
504static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
505 const u8 *mac, __be32 vni)
506{
507 struct vxlan_fdb *f;
508
509 f = __vxlan_find_mac(vxlan, mac, vni);
510 if (f && f->used != jiffies)
511 f->used = jiffies;
512
513 return f;
514}
515
516/* caller should hold vxlan->hash_lock */
517static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
518 union vxlan_addr *ip, __be16 port,
519 __be32 vni, __u32 ifindex)
520{
521 struct vxlan_rdst *rd;
522
523 list_for_each_entry(rd, &f->remotes, list) {
524 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
525 rd->remote_port == port &&
526 rd->remote_vni == vni &&
527 rd->remote_ifindex == ifindex)
528 return rd;
529 }
530
531 return NULL;
532}
533
534int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
535 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
536{
537 struct vxlan_dev *vxlan = netdev_priv(dev);
538 u8 eth_addr[ETH_ALEN + 2] = { 0 };
539 struct vxlan_rdst *rdst;
540 struct vxlan_fdb *f;
541 int rc = 0;
542
543 if (is_multicast_ether_addr(mac) ||
544 is_zero_ether_addr(mac))
545 return -EINVAL;
546
547 ether_addr_copy(eth_addr, mac);
548
549 rcu_read_lock();
550
551 f = __vxlan_find_mac(vxlan, eth_addr, vni);
552 if (!f) {
553 rc = -ENOENT;
554 goto out;
555 }
556
557 rdst = first_remote_rcu(f);
558 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
559
560out:
561 rcu_read_unlock();
562 return rc;
563}
564EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
565
566static int vxlan_fdb_notify_one(struct notifier_block *nb,
567 const struct vxlan_dev *vxlan,
568 const struct vxlan_fdb *f,
569 const struct vxlan_rdst *rdst,
570 struct netlink_ext_ack *extack)
571{
572 struct switchdev_notifier_vxlan_fdb_info fdb_info;
573 int rc;
574
575 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
576 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
577 &fdb_info);
578 return notifier_to_errno(rc);
579}
580
581int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
582 struct notifier_block *nb,
583 struct netlink_ext_ack *extack)
584{
585 struct vxlan_dev *vxlan;
586 struct vxlan_rdst *rdst;
587 struct vxlan_fdb *f;
588 unsigned int h;
589 int rc = 0;
590
591 if (!netif_is_vxlan(dev))
592 return -EINVAL;
593 vxlan = netdev_priv(dev);
594
595 spin_lock_bh(&vxlan->hash_lock);
596 for (h = 0; h < FDB_HASH_SIZE; ++h) {
597 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
598 if (f->vni == vni) {
599 list_for_each_entry(rdst, &f->remotes, list) {
600 rc = vxlan_fdb_notify_one(nb, vxlan,
601 f, rdst,
602 extack);
603 if (rc)
604 goto out;
605 }
606 }
607 }
608 }
609
610out:
611 spin_unlock_bh(&vxlan->hash_lock);
612 return rc;
613}
614EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
615
616void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
617{
618 struct vxlan_dev *vxlan;
619 struct vxlan_rdst *rdst;
620 struct vxlan_fdb *f;
621 unsigned int h;
622
623 if (!netif_is_vxlan(dev))
624 return;
625 vxlan = netdev_priv(dev);
626
627 spin_lock_bh(&vxlan->hash_lock);
628 for (h = 0; h < FDB_HASH_SIZE; ++h) {
629 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
630 if (f->vni == vni)
631 list_for_each_entry(rdst, &f->remotes, list)
632 rdst->offloaded = false;
633 }
634 spin_unlock_bh(&vxlan->hash_lock);
635}
636EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
637
638/* Replace destination of unicast mac */
639static int vxlan_fdb_replace(struct vxlan_fdb *f,
640 union vxlan_addr *ip, __be16 port, __be32 vni,
641 __u32 ifindex, struct vxlan_rdst *oldrd)
642{
643 struct vxlan_rdst *rd;
644
645 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
646 if (rd)
647 return 0;
648
649 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
650 if (!rd)
651 return 0;
652
653 *oldrd = *rd;
654 dst_cache_reset(&rd->dst_cache);
655 rd->remote_ip = *ip;
656 rd->remote_port = port;
657 rd->remote_vni = vni;
658 rd->remote_ifindex = ifindex;
659 rd->offloaded = false;
660 return 1;
661}
662
663/* Add/update destinations for multicast */
664static int vxlan_fdb_append(struct vxlan_fdb *f,
665 union vxlan_addr *ip, __be16 port, __be32 vni,
666 __u32 ifindex, struct vxlan_rdst **rdp)
667{
668 struct vxlan_rdst *rd;
669
670 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
671 if (rd)
672 return 0;
673
674 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
675 if (rd == NULL)
676 return -ENOBUFS;
677
678 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
679 kfree(rd);
680 return -ENOBUFS;
681 }
682
683 rd->remote_ip = *ip;
684 rd->remote_port = port;
685 rd->offloaded = false;
686 rd->remote_vni = vni;
687 rd->remote_ifindex = ifindex;
688
689 list_add_tail_rcu(&rd->list, &f->remotes);
690
691 *rdp = rd;
692 return 1;
693}
694
695static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
696 unsigned int off,
697 struct vxlanhdr *vh, size_t hdrlen,
698 __be32 vni_field,
699 struct gro_remcsum *grc,
700 bool nopartial)
701{
702 size_t start, offset;
703
704 if (skb->remcsum_offload)
705 return vh;
706
707 if (!NAPI_GRO_CB(skb)->csum_valid)
708 return NULL;
709
710 start = vxlan_rco_start(vni_field);
711 offset = start + vxlan_rco_offset(vni_field);
712
713 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
714 start, offset, grc, nopartial);
715
716 skb->remcsum_offload = 1;
717
718 return vh;
719}
720
721static struct sk_buff *vxlan_gro_receive(struct sock *sk,
722 struct list_head *head,
723 struct sk_buff *skb)
724{
725 struct sk_buff *pp = NULL;
726 struct sk_buff *p;
727 struct vxlanhdr *vh, *vh2;
728 unsigned int hlen, off_vx;
729 int flush = 1;
730 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
731 __be32 flags;
732 struct gro_remcsum grc;
733
734 skb_gro_remcsum_init(&grc);
735
736 off_vx = skb_gro_offset(skb);
737 hlen = off_vx + sizeof(*vh);
738 vh = skb_gro_header_fast(skb, off_vx);
739 if (skb_gro_header_hard(skb, hlen)) {
740 vh = skb_gro_header_slow(skb, hlen, off_vx);
741 if (unlikely(!vh))
742 goto out;
743 }
744
745 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
746
747 flags = vh->vx_flags;
748
749 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
750 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
751 vh->vx_vni, &grc,
752 !!(vs->flags &
753 VXLAN_F_REMCSUM_NOPARTIAL));
754
755 if (!vh)
756 goto out;
757 }
758
759 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
760
761 list_for_each_entry(p, head, list) {
762 if (!NAPI_GRO_CB(p)->same_flow)
763 continue;
764
765 vh2 = (struct vxlanhdr *)(p->data + off_vx);
766 if (vh->vx_flags != vh2->vx_flags ||
767 vh->vx_vni != vh2->vx_vni) {
768 NAPI_GRO_CB(p)->same_flow = 0;
769 continue;
770 }
771 }
772
773 pp = call_gro_receive(eth_gro_receive, head, skb);
774 flush = 0;
775
776out:
777 skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
778
779 return pp;
780}
781
782static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
783{
784 /* Sets 'skb->inner_mac_header' since we are always called with
785 * 'skb->encapsulation' set.
786 */
787 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
788}
789
790static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan,
791 const u8 *mac, __u16 state,
792 __be32 src_vni, __u16 ndm_flags)
793{
794 struct vxlan_fdb *f;
795
796 f = kmalloc(sizeof(*f), GFP_ATOMIC);
797 if (!f)
798 return NULL;
799 f->state = state;
800 f->flags = ndm_flags;
801 f->updated = f->used = jiffies;
802 f->vni = src_vni;
803 INIT_LIST_HEAD(&f->remotes);
804 memcpy(f->eth_addr, mac, ETH_ALEN);
805
806 return f;
807}
808
809static int vxlan_fdb_create(struct vxlan_dev *vxlan,
810 const u8 *mac, union vxlan_addr *ip,
811 __u16 state, __be16 port, __be32 src_vni,
812 __be32 vni, __u32 ifindex, __u16 ndm_flags,
813 struct vxlan_fdb **fdb)
814{
815 struct vxlan_rdst *rd = NULL;
816 struct vxlan_fdb *f;
817 int rc;
818
819 if (vxlan->cfg.addrmax &&
820 vxlan->addrcnt >= vxlan->cfg.addrmax)
821 return -ENOSPC;
822
823 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
824 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
825 if (!f)
826 return -ENOMEM;
827
828 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
829 if (rc < 0) {
830 kfree(f);
831 return rc;
832 }
833
834 ++vxlan->addrcnt;
835 hlist_add_head_rcu(&f->hlist,
836 vxlan_fdb_head(vxlan, mac, src_vni));
837
838 *fdb = f;
839
840 return 0;
841}
842
843static void vxlan_fdb_free(struct rcu_head *head)
844{
845 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
846 struct vxlan_rdst *rd, *nd;
847
848 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
849 dst_cache_destroy(&rd->dst_cache);
850 kfree(rd);
851 }
852 kfree(f);
853}
854
855static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
856 bool do_notify, bool swdev_notify)
857{
858 struct vxlan_rdst *rd;
859
860 netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
861
862 --vxlan->addrcnt;
863 if (do_notify)
864 list_for_each_entry(rd, &f->remotes, list)
865 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
866 swdev_notify, NULL);
867
868 hlist_del_rcu(&f->hlist);
869 call_rcu(&f->rcu, vxlan_fdb_free);
870}
871
872static void vxlan_dst_free(struct rcu_head *head)
873{
874 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
875
876 dst_cache_destroy(&rd->dst_cache);
877 kfree(rd);
878}
879
880static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
881 union vxlan_addr *ip,
882 __u16 state, __u16 flags,
883 __be16 port, __be32 vni,
884 __u32 ifindex, __u16 ndm_flags,
885 struct vxlan_fdb *f,
886 bool swdev_notify,
887 struct netlink_ext_ack *extack)
888{
889 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
890 struct vxlan_rdst *rd = NULL;
891 struct vxlan_rdst oldrd;
892 int notify = 0;
893 int rc = 0;
894 int err;
895
896 /* Do not allow an externally learned entry to take over an entry added
897 * by the user.
898 */
899 if (!(fdb_flags & NTF_EXT_LEARNED) ||
900 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
901 if (f->state != state) {
902 f->state = state;
903 f->updated = jiffies;
904 notify = 1;
905 }
906 if (f->flags != fdb_flags) {
907 f->flags = fdb_flags;
908 f->updated = jiffies;
909 notify = 1;
910 }
911 }
912
913 if ((flags & NLM_F_REPLACE)) {
914 /* Only change unicasts */
915 if (!(is_multicast_ether_addr(f->eth_addr) ||
916 is_zero_ether_addr(f->eth_addr))) {
917 rc = vxlan_fdb_replace(f, ip, port, vni,
918 ifindex, &oldrd);
919 notify |= rc;
920 } else {
921 return -EOPNOTSUPP;
922 }
923 }
924 if ((flags & NLM_F_APPEND) &&
925 (is_multicast_ether_addr(f->eth_addr) ||
926 is_zero_ether_addr(f->eth_addr))) {
927 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
928
929 if (rc < 0)
930 return rc;
931 notify |= rc;
932 }
933
934 if (ndm_flags & NTF_USE)
935 f->used = jiffies;
936
937 if (notify) {
938 if (rd == NULL)
939 rd = first_remote_rtnl(f);
940
941 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
942 swdev_notify, extack);
943 if (err)
944 goto err_notify;
945 }
946
947 return 0;
948
949err_notify:
950 if ((flags & NLM_F_REPLACE) && rc)
951 *rd = oldrd;
952 else if ((flags & NLM_F_APPEND) && rc) {
953 list_del_rcu(&rd->list);
954 call_rcu(&rd->rcu, vxlan_dst_free);
955 }
956 return err;
957}
958
959static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
960 const u8 *mac, union vxlan_addr *ip,
961 __u16 state, __u16 flags,
962 __be16 port, __be32 src_vni, __be32 vni,
963 __u32 ifindex, __u16 ndm_flags,
964 bool swdev_notify,
965 struct netlink_ext_ack *extack)
966{
967 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
968 struct vxlan_fdb *f;
969 int rc;
970
971 /* Disallow replace to add a multicast entry */
972 if ((flags & NLM_F_REPLACE) &&
973 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
974 return -EOPNOTSUPP;
975
976 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
977 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
978 vni, ifindex, fdb_flags, &f);
979 if (rc < 0)
980 return rc;
981
982 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
983 swdev_notify, extack);
984 if (rc)
985 goto err_notify;
986
987 return 0;
988
989err_notify:
990 vxlan_fdb_destroy(vxlan, f, false, false);
991 return rc;
992}
993
994/* Add new entry to forwarding table -- assumes lock held */
995static int vxlan_fdb_update(struct vxlan_dev *vxlan,
996 const u8 *mac, union vxlan_addr *ip,
997 __u16 state, __u16 flags,
998 __be16 port, __be32 src_vni, __be32 vni,
999 __u32 ifindex, __u16 ndm_flags,
1000 bool swdev_notify,
1001 struct netlink_ext_ack *extack)
1002{
1003 struct vxlan_fdb *f;
1004
1005 f = __vxlan_find_mac(vxlan, mac, src_vni);
1006 if (f) {
1007 if (flags & NLM_F_EXCL) {
1008 netdev_dbg(vxlan->dev,
1009 "lost race to create %pM\n", mac);
1010 return -EEXIST;
1011 }
1012
1013 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1014 vni, ifindex, ndm_flags, f,
1015 swdev_notify, extack);
1016 } else {
1017 if (!(flags & NLM_F_CREATE))
1018 return -ENOENT;
1019
1020 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1021 port, src_vni, vni, ifindex,
1022 ndm_flags, swdev_notify, extack);
1023 }
1024}
1025
1026static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1027 struct vxlan_rdst *rd, bool swdev_notify)
1028{
1029 list_del_rcu(&rd->list);
1030 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1031 call_rcu(&rd->rcu, vxlan_dst_free);
1032}
1033
1034static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1035 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1036 __be32 *vni, u32 *ifindex)
1037{
1038 struct net *net = dev_net(vxlan->dev);
1039 int err;
1040
1041 if (tb[NDA_DST]) {
1042 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1043 if (err)
1044 return err;
1045 } else {
1046 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1047 if (remote->sa.sa_family == AF_INET) {
1048 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1049 ip->sa.sa_family = AF_INET;
1050#if IS_ENABLED(CONFIG_IPV6)
1051 } else {
1052 ip->sin6.sin6_addr = in6addr_any;
1053 ip->sa.sa_family = AF_INET6;
1054#endif
1055 }
1056 }
1057
1058 if (tb[NDA_PORT]) {
1059 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
1060 return -EINVAL;
1061 *port = nla_get_be16(tb[NDA_PORT]);
1062 } else {
1063 *port = vxlan->cfg.dst_port;
1064 }
1065
1066 if (tb[NDA_VNI]) {
1067 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
1068 return -EINVAL;
1069 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1070 } else {
1071 *vni = vxlan->default_dst.remote_vni;
1072 }
1073
1074 if (tb[NDA_SRC_VNI]) {
1075 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
1076 return -EINVAL;
1077 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1078 } else {
1079 *src_vni = vxlan->default_dst.remote_vni;
1080 }
1081
1082 if (tb[NDA_IFINDEX]) {
1083 struct net_device *tdev;
1084
1085 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
1086 return -EINVAL;
1087 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1088 tdev = __dev_get_by_index(net, *ifindex);
1089 if (!tdev)
1090 return -EADDRNOTAVAIL;
1091 } else {
1092 *ifindex = 0;
1093 }
1094
1095 return 0;
1096}
1097
1098/* Add static entry (via netlink) */
1099static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1100 struct net_device *dev,
1101 const unsigned char *addr, u16 vid, u16 flags,
1102 struct netlink_ext_ack *extack)
1103{
1104 struct vxlan_dev *vxlan = netdev_priv(dev);
1105 /* struct net *net = dev_net(vxlan->dev); */
1106 union vxlan_addr ip;
1107 __be16 port;
1108 __be32 src_vni, vni;
1109 u32 ifindex;
1110 int err;
1111
1112 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1113 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1114 ndm->ndm_state);
1115 return -EINVAL;
1116 }
1117
1118 if (tb[NDA_DST] == NULL)
1119 return -EINVAL;
1120
1121 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1122 if (err)
1123 return err;
1124
1125 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1126 return -EAFNOSUPPORT;
1127
1128 spin_lock_bh(&vxlan->hash_lock);
1129 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1130 port, src_vni, vni, ifindex,
1131 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1132 true, extack);
1133 spin_unlock_bh(&vxlan->hash_lock);
1134
1135 return err;
1136}
1137
1138static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1139 const unsigned char *addr, union vxlan_addr ip,
1140 __be16 port, __be32 src_vni, __be32 vni,
1141 u32 ifindex, bool swdev_notify)
1142{
1143 struct vxlan_fdb *f;
1144 struct vxlan_rdst *rd = NULL;
1145 int err = -ENOENT;
1146
1147 f = vxlan_find_mac(vxlan, addr, src_vni);
1148 if (!f)
1149 return err;
1150
1151 if (!vxlan_addr_any(&ip)) {
1152 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1153 if (!rd)
1154 goto out;
1155 }
1156
1157 /* remove a destination if it's not the only one on the list,
1158 * otherwise destroy the fdb entry
1159 */
1160 if (rd && !list_is_singular(&f->remotes)) {
1161 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1162 goto out;
1163 }
1164
1165 vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1166
1167out:
1168 return 0;
1169}
1170
1171/* Delete entry (via netlink) */
1172static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1173 struct net_device *dev,
1174 const unsigned char *addr, u16 vid)
1175{
1176 struct vxlan_dev *vxlan = netdev_priv(dev);
1177 union vxlan_addr ip;
1178 __be32 src_vni, vni;
1179 __be16 port;
1180 u32 ifindex;
1181 int err;
1182
1183 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1184 if (err)
1185 return err;
1186
1187 spin_lock_bh(&vxlan->hash_lock);
1188 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1189 true);
1190 spin_unlock_bh(&vxlan->hash_lock);
1191
1192 return err;
1193}
1194
1195/* Dump forwarding table */
1196static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1197 struct net_device *dev,
1198 struct net_device *filter_dev, int *idx)
1199{
1200 struct vxlan_dev *vxlan = netdev_priv(dev);
1201 unsigned int h;
1202 int err = 0;
1203
1204 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1205 struct vxlan_fdb *f;
1206
1207 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1208 struct vxlan_rdst *rd;
1209
1210 list_for_each_entry_rcu(rd, &f->remotes, list) {
1211 if (*idx < cb->args[2])
1212 goto skip;
1213
1214 err = vxlan_fdb_info(skb, vxlan, f,
1215 NETLINK_CB(cb->skb).portid,
1216 cb->nlh->nlmsg_seq,
1217 RTM_NEWNEIGH,
1218 NLM_F_MULTI, rd);
1219 if (err < 0)
1220 goto out;
1221skip:
1222 *idx += 1;
1223 }
1224 }
1225 }
1226out:
1227 return err;
1228}
1229
1230static int vxlan_fdb_get(struct sk_buff *skb,
1231 struct nlattr *tb[],
1232 struct net_device *dev,
1233 const unsigned char *addr,
1234 u16 vid, u32 portid, u32 seq,
1235 struct netlink_ext_ack *extack)
1236{
1237 struct vxlan_dev *vxlan = netdev_priv(dev);
1238 struct vxlan_fdb *f;
1239 __be32 vni;
1240 int err;
1241
1242 if (tb[NDA_VNI])
1243 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1244 else
1245 vni = vxlan->default_dst.remote_vni;
1246
1247 rcu_read_lock();
1248
1249 f = __vxlan_find_mac(vxlan, addr, vni);
1250 if (!f) {
1251 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1252 err = -ENOENT;
1253 goto errout;
1254 }
1255
1256 err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1257 RTM_NEWNEIGH, 0, first_remote_rcu(f));
1258errout:
1259 rcu_read_unlock();
1260 return err;
1261}
1262
1263/* Watch incoming packets to learn mapping between Ethernet address
1264 * and Tunnel endpoint.
1265 * Return true if packet is bogus and should be dropped.
1266 */
1267static bool vxlan_snoop(struct net_device *dev,
1268 union vxlan_addr *src_ip, const u8 *src_mac,
1269 u32 src_ifindex, __be32 vni)
1270{
1271 struct vxlan_dev *vxlan = netdev_priv(dev);
1272 struct vxlan_fdb *f;
1273 u32 ifindex = 0;
1274
1275#if IS_ENABLED(CONFIG_IPV6)
1276 if (src_ip->sa.sa_family == AF_INET6 &&
1277 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1278 ifindex = src_ifindex;
1279#endif
1280
1281 f = vxlan_find_mac(vxlan, src_mac, vni);
1282 if (likely(f)) {
1283 struct vxlan_rdst *rdst = first_remote_rcu(f);
1284
1285 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1286 rdst->remote_ifindex == ifindex))
1287 return false;
1288
1289 /* Don't migrate static entries, drop packets */
1290 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1291 return true;
1292
1293 if (net_ratelimit())
1294 netdev_info(dev,
1295 "%pM migrated from %pIS to %pIS\n",
1296 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1297
1298 rdst->remote_ip = *src_ip;
1299 f->updated = jiffies;
1300 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1301 } else {
1302 /* learned new entry */
1303 spin_lock(&vxlan->hash_lock);
1304
1305 /* close off race between vxlan_flush and incoming packets */
1306 if (netif_running(dev))
1307 vxlan_fdb_update(vxlan, src_mac, src_ip,
1308 NUD_REACHABLE,
1309 NLM_F_EXCL|NLM_F_CREATE,
1310 vxlan->cfg.dst_port,
1311 vni,
1312 vxlan->default_dst.remote_vni,
1313 ifindex, NTF_SELF, true, NULL);
1314 spin_unlock(&vxlan->hash_lock);
1315 }
1316
1317 return false;
1318}
1319
1320/* See if multicast group is already in use by other ID */
1321static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1322{
1323 struct vxlan_dev *vxlan;
1324 struct vxlan_sock *sock4;
1325#if IS_ENABLED(CONFIG_IPV6)
1326 struct vxlan_sock *sock6;
1327#endif
1328 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1329
1330 sock4 = rtnl_dereference(dev->vn4_sock);
1331
1332 /* The vxlan_sock is only used by dev, leaving group has
1333 * no effect on other vxlan devices.
1334 */
1335 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1336 return false;
1337#if IS_ENABLED(CONFIG_IPV6)
1338 sock6 = rtnl_dereference(dev->vn6_sock);
1339 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1340 return false;
1341#endif
1342
1343 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1344 if (!netif_running(vxlan->dev) || vxlan == dev)
1345 continue;
1346
1347 if (family == AF_INET &&
1348 rtnl_dereference(vxlan->vn4_sock) != sock4)
1349 continue;
1350#if IS_ENABLED(CONFIG_IPV6)
1351 if (family == AF_INET6 &&
1352 rtnl_dereference(vxlan->vn6_sock) != sock6)
1353 continue;
1354#endif
1355
1356 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1357 &dev->default_dst.remote_ip))
1358 continue;
1359
1360 if (vxlan->default_dst.remote_ifindex !=
1361 dev->default_dst.remote_ifindex)
1362 continue;
1363
1364 return true;
1365 }
1366
1367 return false;
1368}
1369
1370static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1371{
1372 struct vxlan_net *vn;
1373
1374 if (!vs)
1375 return false;
1376 if (!refcount_dec_and_test(&vs->refcnt))
1377 return false;
1378
1379 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1380 spin_lock(&vn->sock_lock);
1381 hlist_del_rcu(&vs->hlist);
1382 udp_tunnel_notify_del_rx_port(vs->sock,
1383 (vs->flags & VXLAN_F_GPE) ?
1384 UDP_TUNNEL_TYPE_VXLAN_GPE :
1385 UDP_TUNNEL_TYPE_VXLAN);
1386 spin_unlock(&vn->sock_lock);
1387
1388 return true;
1389}
1390
1391static void vxlan_sock_release(struct vxlan_dev *vxlan)
1392{
1393 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1394#if IS_ENABLED(CONFIG_IPV6)
1395 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1396
1397 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1398#endif
1399
1400 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1401 synchronize_net();
1402
1403 vxlan_vs_del_dev(vxlan);
1404
1405 if (__vxlan_sock_release_prep(sock4)) {
1406 udp_tunnel_sock_release(sock4->sock);
1407 kfree(sock4);
1408 }
1409
1410#if IS_ENABLED(CONFIG_IPV6)
1411 if (__vxlan_sock_release_prep(sock6)) {
1412 udp_tunnel_sock_release(sock6->sock);
1413 kfree(sock6);
1414 }
1415#endif
1416}
1417
1418/* Update multicast group membership when first VNI on
1419 * multicast address is brought up
1420 */
1421static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1422{
1423 struct sock *sk;
1424 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1425 int ifindex = vxlan->default_dst.remote_ifindex;
1426 int ret = -EINVAL;
1427
1428 if (ip->sa.sa_family == AF_INET) {
1429 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1430 struct ip_mreqn mreq = {
1431 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1432 .imr_ifindex = ifindex,
1433 };
1434
1435 sk = sock4->sock->sk;
1436 lock_sock(sk);
1437 ret = ip_mc_join_group(sk, &mreq);
1438 release_sock(sk);
1439#if IS_ENABLED(CONFIG_IPV6)
1440 } else {
1441 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1442
1443 sk = sock6->sock->sk;
1444 lock_sock(sk);
1445 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1446 &ip->sin6.sin6_addr);
1447 release_sock(sk);
1448#endif
1449 }
1450
1451 return ret;
1452}
1453
1454/* Inverse of vxlan_igmp_join when last VNI is brought down */
1455static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1456{
1457 struct sock *sk;
1458 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1459 int ifindex = vxlan->default_dst.remote_ifindex;
1460 int ret = -EINVAL;
1461
1462 if (ip->sa.sa_family == AF_INET) {
1463 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1464 struct ip_mreqn mreq = {
1465 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1466 .imr_ifindex = ifindex,
1467 };
1468
1469 sk = sock4->sock->sk;
1470 lock_sock(sk);
1471 ret = ip_mc_leave_group(sk, &mreq);
1472 release_sock(sk);
1473#if IS_ENABLED(CONFIG_IPV6)
1474 } else {
1475 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1476
1477 sk = sock6->sock->sk;
1478 lock_sock(sk);
1479 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1480 &ip->sin6.sin6_addr);
1481 release_sock(sk);
1482#endif
1483 }
1484
1485 return ret;
1486}
1487
1488static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1489 struct sk_buff *skb, u32 vxflags)
1490{
1491 size_t start, offset;
1492
1493 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1494 goto out;
1495
1496 start = vxlan_rco_start(unparsed->vx_vni);
1497 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1498
1499 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1500 return false;
1501
1502 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1503 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1504out:
1505 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1506 unparsed->vx_vni &= VXLAN_VNI_MASK;
1507 return true;
1508}
1509
1510static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1511 struct sk_buff *skb, u32 vxflags,
1512 struct vxlan_metadata *md)
1513{
1514 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1515 struct metadata_dst *tun_dst;
1516
1517 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1518 goto out;
1519
1520 md->gbp = ntohs(gbp->policy_id);
1521
1522 tun_dst = (struct metadata_dst *)skb_dst(skb);
1523 if (tun_dst) {
1524 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1525 tun_dst->u.tun_info.options_len = sizeof(*md);
1526 }
1527 if (gbp->dont_learn)
1528 md->gbp |= VXLAN_GBP_DONT_LEARN;
1529
1530 if (gbp->policy_applied)
1531 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1532
1533 /* In flow-based mode, GBP is carried in dst_metadata */
1534 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1535 skb->mark = md->gbp;
1536out:
1537 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1538}
1539
1540static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1541 __be16 *protocol,
1542 struct sk_buff *skb, u32 vxflags)
1543{
1544 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1545
1546 /* Need to have Next Protocol set for interfaces in GPE mode. */
1547 if (!gpe->np_applied)
1548 return false;
1549 /* "The initial version is 0. If a receiver does not support the
1550 * version indicated it MUST drop the packet.
1551 */
1552 if (gpe->version != 0)
1553 return false;
1554 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1555 * processing MUST occur." However, we don't implement OAM
1556 * processing, thus drop the packet.
1557 */
1558 if (gpe->oam_flag)
1559 return false;
1560
1561 *protocol = tun_p_to_eth_p(gpe->next_protocol);
1562 if (!*protocol)
1563 return false;
1564
1565 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1566 return true;
1567}
1568
1569static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1570 struct vxlan_sock *vs,
1571 struct sk_buff *skb, __be32 vni)
1572{
1573 union vxlan_addr saddr;
1574 u32 ifindex = skb->dev->ifindex;
1575
1576 skb_reset_mac_header(skb);
1577 skb->protocol = eth_type_trans(skb, vxlan->dev);
1578 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1579
1580 /* Ignore packet loops (and multicast echo) */
1581 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1582 return false;
1583
1584 /* Get address from the outer IP header */
1585 if (vxlan_get_sk_family(vs) == AF_INET) {
1586 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1587 saddr.sa.sa_family = AF_INET;
1588#if IS_ENABLED(CONFIG_IPV6)
1589 } else {
1590 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1591 saddr.sa.sa_family = AF_INET6;
1592#endif
1593 }
1594
1595 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1596 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1597 return false;
1598
1599 return true;
1600}
1601
1602static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1603 struct sk_buff *skb)
1604{
1605 int err = 0;
1606
1607 if (vxlan_get_sk_family(vs) == AF_INET)
1608 err = IP_ECN_decapsulate(oiph, skb);
1609#if IS_ENABLED(CONFIG_IPV6)
1610 else
1611 err = IP6_ECN_decapsulate(oiph, skb);
1612#endif
1613
1614 if (unlikely(err) && log_ecn_error) {
1615 if (vxlan_get_sk_family(vs) == AF_INET)
1616 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1617 &((struct iphdr *)oiph)->saddr,
1618 ((struct iphdr *)oiph)->tos);
1619 else
1620 net_info_ratelimited("non-ECT from %pI6\n",
1621 &((struct ipv6hdr *)oiph)->saddr);
1622 }
1623 return err <= 1;
1624}
1625
1626/* Callback from net/ipv4/udp.c to receive packets */
1627static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1628{
1629 struct pcpu_sw_netstats *stats;
1630 struct vxlan_dev *vxlan;
1631 struct vxlan_sock *vs;
1632 struct vxlanhdr unparsed;
1633 struct vxlan_metadata _md;
1634 struct vxlan_metadata *md = &_md;
1635 __be16 protocol = htons(ETH_P_TEB);
1636 bool raw_proto = false;
1637 void *oiph;
1638 __be32 vni = 0;
1639
1640 /* Need UDP and VXLAN header to be present */
1641 if (!pskb_may_pull(skb, VXLAN_HLEN))
1642 goto drop;
1643
1644 unparsed = *vxlan_hdr(skb);
1645 /* VNI flag always required to be set */
1646 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1647 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1648 ntohl(vxlan_hdr(skb)->vx_flags),
1649 ntohl(vxlan_hdr(skb)->vx_vni));
1650 /* Return non vxlan pkt */
1651 goto drop;
1652 }
1653 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1654 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1655
1656 vs = rcu_dereference_sk_user_data(sk);
1657 if (!vs)
1658 goto drop;
1659
1660 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1661
1662 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1663 if (!vxlan)
1664 goto drop;
1665
1666 /* For backwards compatibility, only allow reserved fields to be
1667 * used by VXLAN extensions if explicitly requested.
1668 */
1669 if (vs->flags & VXLAN_F_GPE) {
1670 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1671 goto drop;
1672 raw_proto = true;
1673 }
1674
1675 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1676 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1677 goto drop;
1678
1679 if (vxlan_collect_metadata(vs)) {
1680 struct metadata_dst *tun_dst;
1681
1682 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1683 key32_to_tunnel_id(vni), sizeof(*md));
1684
1685 if (!tun_dst)
1686 goto drop;
1687
1688 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1689
1690 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1691 } else {
1692 memset(md, 0, sizeof(*md));
1693 }
1694
1695 if (vs->flags & VXLAN_F_REMCSUM_RX)
1696 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1697 goto drop;
1698 if (vs->flags & VXLAN_F_GBP)
1699 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1700 /* Note that GBP and GPE can never be active together. This is
1701 * ensured in vxlan_dev_configure.
1702 */
1703
1704 if (unparsed.vx_flags || unparsed.vx_vni) {
1705 /* If there are any unprocessed flags remaining treat
1706 * this as a malformed packet. This behavior diverges from
1707 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1708 * in reserved fields are to be ignored. The approach here
1709 * maintains compatibility with previous stack code, and also
1710 * is more robust and provides a little more security in
1711 * adding extensions to VXLAN.
1712 */
1713 goto drop;
1714 }
1715
1716 if (!raw_proto) {
1717 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1718 goto drop;
1719 } else {
1720 skb_reset_mac_header(skb);
1721 skb->dev = vxlan->dev;
1722 skb->pkt_type = PACKET_HOST;
1723 }
1724
1725 oiph = skb_network_header(skb);
1726 skb_reset_network_header(skb);
1727
1728 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1729 ++vxlan->dev->stats.rx_frame_errors;
1730 ++vxlan->dev->stats.rx_errors;
1731 goto drop;
1732 }
1733
1734 rcu_read_lock();
1735
1736 if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1737 rcu_read_unlock();
1738 atomic_long_inc(&vxlan->dev->rx_dropped);
1739 goto drop;
1740 }
1741
1742 stats = this_cpu_ptr(vxlan->dev->tstats);
1743 u64_stats_update_begin(&stats->syncp);
1744 stats->rx_packets++;
1745 stats->rx_bytes += skb->len;
1746 u64_stats_update_end(&stats->syncp);
1747
1748 gro_cells_receive(&vxlan->gro_cells, skb);
1749
1750 rcu_read_unlock();
1751
1752 return 0;
1753
1754drop:
1755 /* Consume bad packet */
1756 kfree_skb(skb);
1757 return 0;
1758}
1759
1760/* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1761static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1762{
1763 struct vxlan_dev *vxlan;
1764 struct vxlan_sock *vs;
1765 struct vxlanhdr *hdr;
1766 __be32 vni;
1767
1768 if (skb->len < VXLAN_HLEN)
1769 return -EINVAL;
1770
1771 hdr = vxlan_hdr(skb);
1772
1773 if (!(hdr->vx_flags & VXLAN_HF_VNI))
1774 return -EINVAL;
1775
1776 vs = rcu_dereference_sk_user_data(sk);
1777 if (!vs)
1778 return -ENOENT;
1779
1780 vni = vxlan_vni(hdr->vx_vni);
1781 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1782 if (!vxlan)
1783 return -ENOENT;
1784
1785 return 0;
1786}
1787
1788static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1789{
1790 struct vxlan_dev *vxlan = netdev_priv(dev);
1791 struct arphdr *parp;
1792 u8 *arpptr, *sha;
1793 __be32 sip, tip;
1794 struct neighbour *n;
1795
1796 if (dev->flags & IFF_NOARP)
1797 goto out;
1798
1799 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1800 dev->stats.tx_dropped++;
1801 goto out;
1802 }
1803 parp = arp_hdr(skb);
1804
1805 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1806 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1807 parp->ar_pro != htons(ETH_P_IP) ||
1808 parp->ar_op != htons(ARPOP_REQUEST) ||
1809 parp->ar_hln != dev->addr_len ||
1810 parp->ar_pln != 4)
1811 goto out;
1812 arpptr = (u8 *)parp + sizeof(struct arphdr);
1813 sha = arpptr;
1814 arpptr += dev->addr_len; /* sha */
1815 memcpy(&sip, arpptr, sizeof(sip));
1816 arpptr += sizeof(sip);
1817 arpptr += dev->addr_len; /* tha */
1818 memcpy(&tip, arpptr, sizeof(tip));
1819
1820 if (ipv4_is_loopback(tip) ||
1821 ipv4_is_multicast(tip))
1822 goto out;
1823
1824 n = neigh_lookup(&arp_tbl, &tip, dev);
1825
1826 if (n) {
1827 struct vxlan_fdb *f;
1828 struct sk_buff *reply;
1829
1830 if (!(n->nud_state & NUD_CONNECTED)) {
1831 neigh_release(n);
1832 goto out;
1833 }
1834
1835 f = vxlan_find_mac(vxlan, n->ha, vni);
1836 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1837 /* bridge-local neighbor */
1838 neigh_release(n);
1839 goto out;
1840 }
1841
1842 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1843 n->ha, sha);
1844
1845 neigh_release(n);
1846
1847 if (reply == NULL)
1848 goto out;
1849
1850 skb_reset_mac_header(reply);
1851 __skb_pull(reply, skb_network_offset(reply));
1852 reply->ip_summed = CHECKSUM_UNNECESSARY;
1853 reply->pkt_type = PACKET_HOST;
1854
1855 if (netif_rx_ni(reply) == NET_RX_DROP)
1856 dev->stats.rx_dropped++;
1857 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1858 union vxlan_addr ipa = {
1859 .sin.sin_addr.s_addr = tip,
1860 .sin.sin_family = AF_INET,
1861 };
1862
1863 vxlan_ip_miss(dev, &ipa);
1864 }
1865out:
1866 consume_skb(skb);
1867 return NETDEV_TX_OK;
1868}
1869
1870#if IS_ENABLED(CONFIG_IPV6)
1871static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1872 struct neighbour *n, bool isrouter)
1873{
1874 struct net_device *dev = request->dev;
1875 struct sk_buff *reply;
1876 struct nd_msg *ns, *na;
1877 struct ipv6hdr *pip6;
1878 u8 *daddr;
1879 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1880 int ns_olen;
1881 int i, len;
1882
1883 if (dev == NULL || !pskb_may_pull(request, request->len))
1884 return NULL;
1885
1886 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1887 sizeof(*na) + na_olen + dev->needed_tailroom;
1888 reply = alloc_skb(len, GFP_ATOMIC);
1889 if (reply == NULL)
1890 return NULL;
1891
1892 reply->protocol = htons(ETH_P_IPV6);
1893 reply->dev = dev;
1894 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1895 skb_push(reply, sizeof(struct ethhdr));
1896 skb_reset_mac_header(reply);
1897
1898 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1899
1900 daddr = eth_hdr(request)->h_source;
1901 ns_olen = request->len - skb_network_offset(request) -
1902 sizeof(struct ipv6hdr) - sizeof(*ns);
1903 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1904 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1905 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1906 break;
1907 }
1908 }
1909
1910 /* Ethernet header */
1911 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1912 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1913 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1914 reply->protocol = htons(ETH_P_IPV6);
1915
1916 skb_pull(reply, sizeof(struct ethhdr));
1917 skb_reset_network_header(reply);
1918 skb_put(reply, sizeof(struct ipv6hdr));
1919
1920 /* IPv6 header */
1921
1922 pip6 = ipv6_hdr(reply);
1923 memset(pip6, 0, sizeof(struct ipv6hdr));
1924 pip6->version = 6;
1925 pip6->priority = ipv6_hdr(request)->priority;
1926 pip6->nexthdr = IPPROTO_ICMPV6;
1927 pip6->hop_limit = 255;
1928 pip6->daddr = ipv6_hdr(request)->saddr;
1929 pip6->saddr = *(struct in6_addr *)n->primary_key;
1930
1931 skb_pull(reply, sizeof(struct ipv6hdr));
1932 skb_reset_transport_header(reply);
1933
1934 /* Neighbor Advertisement */
1935 na = skb_put_zero(reply, sizeof(*na) + na_olen);
1936 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1937 na->icmph.icmp6_router = isrouter;
1938 na->icmph.icmp6_override = 1;
1939 na->icmph.icmp6_solicited = 1;
1940 na->target = ns->target;
1941 ether_addr_copy(&na->opt[2], n->ha);
1942 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1943 na->opt[1] = na_olen >> 3;
1944
1945 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1946 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1947 csum_partial(na, sizeof(*na)+na_olen, 0));
1948
1949 pip6->payload_len = htons(sizeof(*na)+na_olen);
1950
1951 skb_push(reply, sizeof(struct ipv6hdr));
1952
1953 reply->ip_summed = CHECKSUM_UNNECESSARY;
1954
1955 return reply;
1956}
1957
1958static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1959{
1960 struct vxlan_dev *vxlan = netdev_priv(dev);
1961 const struct in6_addr *daddr;
1962 const struct ipv6hdr *iphdr;
1963 struct inet6_dev *in6_dev;
1964 struct neighbour *n;
1965 struct nd_msg *msg;
1966
1967 in6_dev = __in6_dev_get(dev);
1968 if (!in6_dev)
1969 goto out;
1970
1971 iphdr = ipv6_hdr(skb);
1972 daddr = &iphdr->daddr;
1973 msg = (struct nd_msg *)(iphdr + 1);
1974
1975 if (ipv6_addr_loopback(daddr) ||
1976 ipv6_addr_is_multicast(&msg->target))
1977 goto out;
1978
1979 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1980
1981 if (n) {
1982 struct vxlan_fdb *f;
1983 struct sk_buff *reply;
1984
1985 if (!(n->nud_state & NUD_CONNECTED)) {
1986 neigh_release(n);
1987 goto out;
1988 }
1989
1990 f = vxlan_find_mac(vxlan, n->ha, vni);
1991 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1992 /* bridge-local neighbor */
1993 neigh_release(n);
1994 goto out;
1995 }
1996
1997 reply = vxlan_na_create(skb, n,
1998 !!(f ? f->flags & NTF_ROUTER : 0));
1999
2000 neigh_release(n);
2001
2002 if (reply == NULL)
2003 goto out;
2004
2005 if (netif_rx_ni(reply) == NET_RX_DROP)
2006 dev->stats.rx_dropped++;
2007
2008 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2009 union vxlan_addr ipa = {
2010 .sin6.sin6_addr = msg->target,
2011 .sin6.sin6_family = AF_INET6,
2012 };
2013
2014 vxlan_ip_miss(dev, &ipa);
2015 }
2016
2017out:
2018 consume_skb(skb);
2019 return NETDEV_TX_OK;
2020}
2021#endif
2022
2023static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2024{
2025 struct vxlan_dev *vxlan = netdev_priv(dev);
2026 struct neighbour *n;
2027
2028 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2029 return false;
2030
2031 n = NULL;
2032 switch (ntohs(eth_hdr(skb)->h_proto)) {
2033 case ETH_P_IP:
2034 {
2035 struct iphdr *pip;
2036
2037 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2038 return false;
2039 pip = ip_hdr(skb);
2040 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2041 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2042 union vxlan_addr ipa = {
2043 .sin.sin_addr.s_addr = pip->daddr,
2044 .sin.sin_family = AF_INET,
2045 };
2046
2047 vxlan_ip_miss(dev, &ipa);
2048 return false;
2049 }
2050
2051 break;
2052 }
2053#if IS_ENABLED(CONFIG_IPV6)
2054 case ETH_P_IPV6:
2055 {
2056 struct ipv6hdr *pip6;
2057
2058 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2059 return false;
2060 pip6 = ipv6_hdr(skb);
2061 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2062 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2063 union vxlan_addr ipa = {
2064 .sin6.sin6_addr = pip6->daddr,
2065 .sin6.sin6_family = AF_INET6,
2066 };
2067
2068 vxlan_ip_miss(dev, &ipa);
2069 return false;
2070 }
2071
2072 break;
2073 }
2074#endif
2075 default:
2076 return false;
2077 }
2078
2079 if (n) {
2080 bool diff;
2081
2082 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2083 if (diff) {
2084 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2085 dev->addr_len);
2086 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2087 }
2088 neigh_release(n);
2089 return diff;
2090 }
2091
2092 return false;
2093}
2094
2095static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
2096 struct vxlan_metadata *md)
2097{
2098 struct vxlanhdr_gbp *gbp;
2099
2100 if (!md->gbp)
2101 return;
2102
2103 gbp = (struct vxlanhdr_gbp *)vxh;
2104 vxh->vx_flags |= VXLAN_HF_GBP;
2105
2106 if (md->gbp & VXLAN_GBP_DONT_LEARN)
2107 gbp->dont_learn = 1;
2108
2109 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
2110 gbp->policy_applied = 1;
2111
2112 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
2113}
2114
2115static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
2116 __be16 protocol)
2117{
2118 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2119
2120 gpe->np_applied = 1;
2121 gpe->next_protocol = tun_p_from_eth_p(protocol);
2122 if (!gpe->next_protocol)
2123 return -EPFNOSUPPORT;
2124 return 0;
2125}
2126
2127static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2128 int iphdr_len, __be32 vni,
2129 struct vxlan_metadata *md, u32 vxflags,
2130 bool udp_sum)
2131{
2132 struct vxlanhdr *vxh;
2133 int min_headroom;
2134 int err;
2135 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2136 __be16 inner_protocol = htons(ETH_P_TEB);
2137
2138 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2139 skb->ip_summed == CHECKSUM_PARTIAL) {
2140 int csum_start = skb_checksum_start_offset(skb);
2141
2142 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2143 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2144 (skb->csum_offset == offsetof(struct udphdr, check) ||
2145 skb->csum_offset == offsetof(struct tcphdr, check)))
2146 type |= SKB_GSO_TUNNEL_REMCSUM;
2147 }
2148
2149 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2150 + VXLAN_HLEN + iphdr_len;
2151
2152 /* Need space for new headers (invalidates iph ptr) */
2153 err = skb_cow_head(skb, min_headroom);
2154 if (unlikely(err))
2155 return err;
2156
2157 err = iptunnel_handle_offloads(skb, type);
2158 if (err)
2159 return err;
2160
2161 vxh = __skb_push(skb, sizeof(*vxh));
2162 vxh->vx_flags = VXLAN_HF_VNI;
2163 vxh->vx_vni = vxlan_vni_field(vni);
2164
2165 if (type & SKB_GSO_TUNNEL_REMCSUM) {
2166 unsigned int start;
2167
2168 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2169 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2170 vxh->vx_flags |= VXLAN_HF_RCO;
2171
2172 if (!skb_is_gso(skb)) {
2173 skb->ip_summed = CHECKSUM_NONE;
2174 skb->encapsulation = 0;
2175 }
2176 }
2177
2178 if (vxflags & VXLAN_F_GBP)
2179 vxlan_build_gbp_hdr(vxh, vxflags, md);
2180 if (vxflags & VXLAN_F_GPE) {
2181 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
2182 if (err < 0)
2183 return err;
2184 inner_protocol = skb->protocol;
2185 }
2186
2187 skb_set_inner_protocol(skb, inner_protocol);
2188 return 0;
2189}
2190
2191static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2192 struct vxlan_sock *sock4,
2193 struct sk_buff *skb, int oif, u8 tos,
2194 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2195 struct dst_cache *dst_cache,
2196 const struct ip_tunnel_info *info)
2197{
2198 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2199 struct rtable *rt = NULL;
2200 struct flowi4 fl4;
2201
2202 if (!sock4)
2203 return ERR_PTR(-EIO);
2204
2205 if (tos && !info)
2206 use_cache = false;
2207 if (use_cache) {
2208 rt = dst_cache_get_ip4(dst_cache, saddr);
2209 if (rt)
2210 return rt;
2211 }
2212
2213 memset(&fl4, 0, sizeof(fl4));
2214 fl4.flowi4_oif = oif;
2215 fl4.flowi4_tos = RT_TOS(tos);
2216 fl4.flowi4_mark = skb->mark;
2217 fl4.flowi4_proto = IPPROTO_UDP;
2218 fl4.daddr = daddr;
2219 fl4.saddr = *saddr;
2220 fl4.fl4_dport = dport;
2221 fl4.fl4_sport = sport;
2222
2223 rt = ip_route_output_key(vxlan->net, &fl4);
2224 if (likely(!IS_ERR(rt))) {
2225 if (rt->dst.dev == dev) {
2226 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2227 ip_rt_put(rt);
2228 return ERR_PTR(-ELOOP);
2229 }
2230
2231 *saddr = fl4.saddr;
2232 if (use_cache)
2233 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2234 } else {
2235 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2236 return ERR_PTR(-ENETUNREACH);
2237 }
2238 return rt;
2239}
2240
2241#if IS_ENABLED(CONFIG_IPV6)
2242static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2243 struct net_device *dev,
2244 struct vxlan_sock *sock6,
2245 struct sk_buff *skb, int oif, u8 tos,
2246 __be32 label,
2247 const struct in6_addr *daddr,
2248 struct in6_addr *saddr,
2249 __be16 dport, __be16 sport,
2250 struct dst_cache *dst_cache,
2251 const struct ip_tunnel_info *info)
2252{
2253 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2254 struct dst_entry *ndst;
2255 struct flowi6 fl6;
2256 int err;
2257
2258 if (!sock6)
2259 return ERR_PTR(-EIO);
2260
2261 if (tos && !info)
2262 use_cache = false;
2263 if (use_cache) {
2264 ndst = dst_cache_get_ip6(dst_cache, saddr);
2265 if (ndst)
2266 return ndst;
2267 }
2268
2269 memset(&fl6, 0, sizeof(fl6));
2270 fl6.flowi6_oif = oif;
2271 fl6.daddr = *daddr;
2272 fl6.saddr = *saddr;
2273 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2274 fl6.flowi6_mark = skb->mark;
2275 fl6.flowi6_proto = IPPROTO_UDP;
2276 fl6.fl6_dport = dport;
2277 fl6.fl6_sport = sport;
2278
2279 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
2280 sock6->sock->sk,
2281 &ndst, &fl6);
2282 if (unlikely(err < 0)) {
2283 netdev_dbg(dev, "no route to %pI6\n", daddr);
2284 return ERR_PTR(-ENETUNREACH);
2285 }
2286
2287 if (unlikely(ndst->dev == dev)) {
2288 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2289 dst_release(ndst);
2290 return ERR_PTR(-ELOOP);
2291 }
2292
2293 *saddr = fl6.saddr;
2294 if (use_cache)
2295 dst_cache_set_ip6(dst_cache, ndst, saddr);
2296 return ndst;
2297}
2298#endif
2299
2300/* Bypass encapsulation if the destination is local */
2301static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2302 struct vxlan_dev *dst_vxlan, __be32 vni)
2303{
2304 struct pcpu_sw_netstats *tx_stats, *rx_stats;
2305 union vxlan_addr loopback;
2306 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2307 struct net_device *dev;
2308 int len = skb->len;
2309
2310 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2311 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2312 skb->pkt_type = PACKET_HOST;
2313 skb->encapsulation = 0;
2314 skb->dev = dst_vxlan->dev;
2315 __skb_pull(skb, skb_network_offset(skb));
2316
2317 if (remote_ip->sa.sa_family == AF_INET) {
2318 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2319 loopback.sa.sa_family = AF_INET;
2320#if IS_ENABLED(CONFIG_IPV6)
2321 } else {
2322 loopback.sin6.sin6_addr = in6addr_loopback;
2323 loopback.sa.sa_family = AF_INET6;
2324#endif
2325 }
2326
2327 rcu_read_lock();
2328 dev = skb->dev;
2329 if (unlikely(!(dev->flags & IFF_UP))) {
2330 kfree_skb(skb);
2331 goto drop;
2332 }
2333
2334 if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2335 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2336
2337 u64_stats_update_begin(&tx_stats->syncp);
2338 tx_stats->tx_packets++;
2339 tx_stats->tx_bytes += len;
2340 u64_stats_update_end(&tx_stats->syncp);
2341
2342 if (netif_rx(skb) == NET_RX_SUCCESS) {
2343 u64_stats_update_begin(&rx_stats->syncp);
2344 rx_stats->rx_packets++;
2345 rx_stats->rx_bytes += len;
2346 u64_stats_update_end(&rx_stats->syncp);
2347 } else {
2348drop:
2349 dev->stats.rx_dropped++;
2350 }
2351 rcu_read_unlock();
2352}
2353
2354static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2355 struct vxlan_dev *vxlan,
2356 union vxlan_addr *daddr,
2357 __be16 dst_port, int dst_ifindex, __be32 vni,
2358 struct dst_entry *dst,
2359 u32 rt_flags)
2360{
2361#if IS_ENABLED(CONFIG_IPV6)
2362 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2363 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2364 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2365 */
2366 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2367#endif
2368 /* Bypass encapsulation if the destination is local */
2369 if (rt_flags & RTCF_LOCAL &&
2370 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2371 struct vxlan_dev *dst_vxlan;
2372
2373 dst_release(dst);
2374 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2375 daddr->sa.sa_family, dst_port,
2376 vxlan->cfg.flags);
2377 if (!dst_vxlan) {
2378 dev->stats.tx_errors++;
2379 kfree_skb(skb);
2380
2381 return -ENOENT;
2382 }
2383 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2384 return 1;
2385 }
2386
2387 return 0;
2388}
2389
2390static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2391 __be32 default_vni, struct vxlan_rdst *rdst,
2392 bool did_rsc)
2393{
2394 struct dst_cache *dst_cache;
2395 struct ip_tunnel_info *info;
2396 struct vxlan_dev *vxlan = netdev_priv(dev);
2397 const struct iphdr *old_iph = ip_hdr(skb);
2398 union vxlan_addr *dst;
2399 union vxlan_addr remote_ip, local_ip;
2400 struct vxlan_metadata _md;
2401 struct vxlan_metadata *md = &_md;
2402 __be16 src_port = 0, dst_port;
2403 struct dst_entry *ndst = NULL;
2404 __be32 vni, label;
2405 __u8 tos, ttl;
2406 int ifindex;
2407 int err;
2408 u32 flags = vxlan->cfg.flags;
2409 bool udp_sum = false;
2410 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2411
2412 info = skb_tunnel_info(skb);
2413
2414 if (rdst) {
2415 dst = &rdst->remote_ip;
2416 if (vxlan_addr_any(dst)) {
2417 if (did_rsc) {
2418 /* short-circuited back to local bridge */
2419 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2420 return;
2421 }
2422 goto drop;
2423 }
2424
2425 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2426 vni = (rdst->remote_vni) ? : default_vni;
2427 ifindex = rdst->remote_ifindex;
2428 local_ip = vxlan->cfg.saddr;
2429 dst_cache = &rdst->dst_cache;
2430 md->gbp = skb->mark;
2431 if (flags & VXLAN_F_TTL_INHERIT) {
2432 ttl = ip_tunnel_get_ttl(old_iph, skb);
2433 } else {
2434 ttl = vxlan->cfg.ttl;
2435 if (!ttl && vxlan_addr_multicast(dst))
2436 ttl = 1;
2437 }
2438
2439 tos = vxlan->cfg.tos;
2440 if (tos == 1)
2441 tos = ip_tunnel_get_dsfield(old_iph, skb);
2442
2443 if (dst->sa.sa_family == AF_INET)
2444 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2445 else
2446 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2447 label = vxlan->cfg.label;
2448 } else {
2449 if (!info) {
2450 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2451 dev->name);
2452 goto drop;
2453 }
2454 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2455 if (remote_ip.sa.sa_family == AF_INET) {
2456 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2457 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2458 } else {
2459 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2460 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2461 }
2462 dst = &remote_ip;
2463 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2464 vni = tunnel_id_to_key32(info->key.tun_id);
2465 ifindex = 0;
2466 dst_cache = &info->dst_cache;
2467 if (info->options_len &&
2468 info->key.tun_flags & TUNNEL_VXLAN_OPT)
2469 md = ip_tunnel_info_opts(info);
2470 ttl = info->key.ttl;
2471 tos = info->key.tos;
2472 label = info->key.label;
2473 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2474 }
2475 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2476 vxlan->cfg.port_max, true);
2477
2478 rcu_read_lock();
2479 if (dst->sa.sa_family == AF_INET) {
2480 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2481 struct rtable *rt;
2482 __be16 df = 0;
2483
2484 if (!ifindex)
2485 ifindex = sock4->sock->sk->sk_bound_dev_if;
2486
2487 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2488 dst->sin.sin_addr.s_addr,
2489 &local_ip.sin.sin_addr.s_addr,
2490 dst_port, src_port,
2491 dst_cache, info);
2492 if (IS_ERR(rt)) {
2493 err = PTR_ERR(rt);
2494 goto tx_error;
2495 }
2496
2497 if (!info) {
2498 /* Bypass encapsulation if the destination is local */
2499 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2500 dst_port, ifindex, vni,
2501 &rt->dst, rt->rt_flags);
2502 if (err)
2503 goto out_unlock;
2504
2505 if (vxlan->cfg.df == VXLAN_DF_SET) {
2506 df = htons(IP_DF);
2507 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2508 struct ethhdr *eth = eth_hdr(skb);
2509
2510 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2511 (ntohs(eth->h_proto) == ETH_P_IP &&
2512 old_iph->frag_off & htons(IP_DF)))
2513 df = htons(IP_DF);
2514 }
2515 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2516 df = htons(IP_DF);
2517 }
2518
2519 ndst = &rt->dst;
2520 skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
2521
2522 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2523 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2524 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2525 vni, md, flags, udp_sum);
2526 if (err < 0)
2527 goto tx_error;
2528
2529 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2530 dst->sin.sin_addr.s_addr, tos, ttl, df,
2531 src_port, dst_port, xnet, !udp_sum);
2532#if IS_ENABLED(CONFIG_IPV6)
2533 } else {
2534 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2535
2536 if (!ifindex)
2537 ifindex = sock6->sock->sk->sk_bound_dev_if;
2538
2539 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2540 label, &dst->sin6.sin6_addr,
2541 &local_ip.sin6.sin6_addr,
2542 dst_port, src_port,
2543 dst_cache, info);
2544 if (IS_ERR(ndst)) {
2545 err = PTR_ERR(ndst);
2546 ndst = NULL;
2547 goto tx_error;
2548 }
2549
2550 if (!info) {
2551 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2552
2553 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2554 dst_port, ifindex, vni,
2555 ndst, rt6i_flags);
2556 if (err)
2557 goto out_unlock;
2558 }
2559
2560 skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
2561
2562 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2563 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2564 skb_scrub_packet(skb, xnet);
2565 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2566 vni, md, flags, udp_sum);
2567 if (err < 0)
2568 goto tx_error;
2569
2570 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2571 &local_ip.sin6.sin6_addr,
2572 &dst->sin6.sin6_addr, tos, ttl,
2573 label, src_port, dst_port, !udp_sum);
2574#endif
2575 }
2576out_unlock:
2577 rcu_read_unlock();
2578 return;
2579
2580drop:
2581 dev->stats.tx_dropped++;
2582 dev_kfree_skb(skb);
2583 return;
2584
2585tx_error:
2586 rcu_read_unlock();
2587 if (err == -ELOOP)
2588 dev->stats.collisions++;
2589 else if (err == -ENETUNREACH)
2590 dev->stats.tx_carrier_errors++;
2591 dst_release(ndst);
2592 dev->stats.tx_errors++;
2593 kfree_skb(skb);
2594}
2595
2596/* Transmit local packets over Vxlan
2597 *
2598 * Outer IP header inherits ECN and DF from inner header.
2599 * Outer UDP destination is the VXLAN assigned port.
2600 * source port is based on hash of flow
2601 */
2602static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2603{
2604 struct vxlan_dev *vxlan = netdev_priv(dev);
2605 struct vxlan_rdst *rdst, *fdst = NULL;
2606 const struct ip_tunnel_info *info;
2607 bool did_rsc = false;
2608 struct vxlan_fdb *f;
2609 struct ethhdr *eth;
2610 __be32 vni = 0;
2611
2612 info = skb_tunnel_info(skb);
2613
2614 skb_reset_mac_header(skb);
2615
2616 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2617 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2618 info->mode & IP_TUNNEL_INFO_TX) {
2619 vni = tunnel_id_to_key32(info->key.tun_id);
2620 } else {
2621 if (info && info->mode & IP_TUNNEL_INFO_TX)
2622 vxlan_xmit_one(skb, dev, vni, NULL, false);
2623 else
2624 kfree_skb(skb);
2625 return NETDEV_TX_OK;
2626 }
2627 }
2628
2629 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2630 eth = eth_hdr(skb);
2631 if (ntohs(eth->h_proto) == ETH_P_ARP)
2632 return arp_reduce(dev, skb, vni);
2633#if IS_ENABLED(CONFIG_IPV6)
2634 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2635 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2636 sizeof(struct nd_msg)) &&
2637 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2638 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2639
2640 if (m->icmph.icmp6_code == 0 &&
2641 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2642 return neigh_reduce(dev, skb, vni);
2643 }
2644#endif
2645 }
2646
2647 eth = eth_hdr(skb);
2648 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2649 did_rsc = false;
2650
2651 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2652 (ntohs(eth->h_proto) == ETH_P_IP ||
2653 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2654 did_rsc = route_shortcircuit(dev, skb);
2655 if (did_rsc)
2656 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2657 }
2658
2659 if (f == NULL) {
2660 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2661 if (f == NULL) {
2662 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2663 !is_multicast_ether_addr(eth->h_dest))
2664 vxlan_fdb_miss(vxlan, eth->h_dest);
2665
2666 dev->stats.tx_dropped++;
2667 kfree_skb(skb);
2668 return NETDEV_TX_OK;
2669 }
2670 }
2671
2672 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2673 struct sk_buff *skb1;
2674
2675 if (!fdst) {
2676 fdst = rdst;
2677 continue;
2678 }
2679 skb1 = skb_clone(skb, GFP_ATOMIC);
2680 if (skb1)
2681 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2682 }
2683
2684 if (fdst)
2685 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2686 else
2687 kfree_skb(skb);
2688 return NETDEV_TX_OK;
2689}
2690
2691/* Walk the forwarding table and purge stale entries */
2692static void vxlan_cleanup(struct timer_list *t)
2693{
2694 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2695 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2696 unsigned int h;
2697
2698 if (!netif_running(vxlan->dev))
2699 return;
2700
2701 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2702 struct hlist_node *p, *n;
2703
2704 spin_lock(&vxlan->hash_lock);
2705 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2706 struct vxlan_fdb *f
2707 = container_of(p, struct vxlan_fdb, hlist);
2708 unsigned long timeout;
2709
2710 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2711 continue;
2712
2713 if (f->flags & NTF_EXT_LEARNED)
2714 continue;
2715
2716 timeout = f->used + vxlan->cfg.age_interval * HZ;
2717 if (time_before_eq(timeout, jiffies)) {
2718 netdev_dbg(vxlan->dev,
2719 "garbage collect %pM\n",
2720 f->eth_addr);
2721 f->state = NUD_STALE;
2722 vxlan_fdb_destroy(vxlan, f, true, true);
2723 } else if (time_before(timeout, next_timer))
2724 next_timer = timeout;
2725 }
2726 spin_unlock(&vxlan->hash_lock);
2727 }
2728
2729 mod_timer(&vxlan->age_timer, next_timer);
2730}
2731
2732static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2733{
2734 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2735
2736 spin_lock(&vn->sock_lock);
2737 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2738#if IS_ENABLED(CONFIG_IPV6)
2739 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2740#endif
2741 spin_unlock(&vn->sock_lock);
2742}
2743
2744static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2745 struct vxlan_dev_node *node)
2746{
2747 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2748 __be32 vni = vxlan->default_dst.remote_vni;
2749
2750 node->vxlan = vxlan;
2751 spin_lock(&vn->sock_lock);
2752 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2753 spin_unlock(&vn->sock_lock);
2754}
2755
2756/* Setup stats when device is created */
2757static int vxlan_init(struct net_device *dev)
2758{
2759 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2760 if (!dev->tstats)
2761 return -ENOMEM;
2762
2763 return 0;
2764}
2765
2766static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2767{
2768 struct vxlan_fdb *f;
2769
2770 spin_lock_bh(&vxlan->hash_lock);
2771 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2772 if (f)
2773 vxlan_fdb_destroy(vxlan, f, true, true);
2774 spin_unlock_bh(&vxlan->hash_lock);
2775}
2776
2777static void vxlan_uninit(struct net_device *dev)
2778{
2779 struct vxlan_dev *vxlan = netdev_priv(dev);
2780
2781 gro_cells_destroy(&vxlan->gro_cells);
2782
2783 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2784
2785 free_percpu(dev->tstats);
2786}
2787
2788/* Start ageing timer and join group when device is brought up */
2789static int vxlan_open(struct net_device *dev)
2790{
2791 struct vxlan_dev *vxlan = netdev_priv(dev);
2792 int ret;
2793
2794 ret = vxlan_sock_add(vxlan);
2795 if (ret < 0)
2796 return ret;
2797
2798 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2799 ret = vxlan_igmp_join(vxlan);
2800 if (ret == -EADDRINUSE)
2801 ret = 0;
2802 if (ret) {
2803 vxlan_sock_release(vxlan);
2804 return ret;
2805 }
2806 }
2807
2808 if (vxlan->cfg.age_interval)
2809 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2810
2811 return ret;
2812}
2813
2814/* Purge the forwarding table */
2815static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2816{
2817 unsigned int h;
2818
2819 spin_lock_bh(&vxlan->hash_lock);
2820 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2821 struct hlist_node *p, *n;
2822 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2823 struct vxlan_fdb *f
2824 = container_of(p, struct vxlan_fdb, hlist);
2825 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2826 continue;
2827 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2828 if (!is_zero_ether_addr(f->eth_addr))
2829 vxlan_fdb_destroy(vxlan, f, true, true);
2830 }
2831 }
2832 spin_unlock_bh(&vxlan->hash_lock);
2833}
2834
2835/* Cleanup timer and forwarding table on shutdown */
2836static int vxlan_stop(struct net_device *dev)
2837{
2838 struct vxlan_dev *vxlan = netdev_priv(dev);
2839 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2840 int ret = 0;
2841
2842 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2843 !vxlan_group_used(vn, vxlan))
2844 ret = vxlan_igmp_leave(vxlan);
2845
2846 del_timer_sync(&vxlan->age_timer);
2847
2848 vxlan_flush(vxlan, false);
2849 vxlan_sock_release(vxlan);
2850
2851 return ret;
2852}
2853
2854/* Stub, nothing needs to be done. */
2855static void vxlan_set_multicast_list(struct net_device *dev)
2856{
2857}
2858
2859static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2860{
2861 struct vxlan_dev *vxlan = netdev_priv(dev);
2862 struct vxlan_rdst *dst = &vxlan->default_dst;
2863 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2864 dst->remote_ifindex);
2865 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2866
2867 /* This check is different than dev->max_mtu, because it looks at
2868 * the lowerdev->mtu, rather than the static dev->max_mtu
2869 */
2870 if (lowerdev) {
2871 int max_mtu = lowerdev->mtu -
2872 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2873 if (new_mtu > max_mtu)
2874 return -EINVAL;
2875 }
2876
2877 dev->mtu = new_mtu;
2878 return 0;
2879}
2880
2881static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2882{
2883 struct vxlan_dev *vxlan = netdev_priv(dev);
2884 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2885 __be16 sport, dport;
2886
2887 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2888 vxlan->cfg.port_max, true);
2889 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2890
2891 if (ip_tunnel_info_af(info) == AF_INET) {
2892 struct vxlan_sock *sock4 = rcu_dereference(