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vxlan: silence one build warning
[deliverable/linux.git] / drivers / net / vxlan.c
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/rculist.h>
20 #include <linux/netdevice.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/udp.h>
24 #include <linux/igmp.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/hash.h>
29 #include <linux/ethtool.h>
30 #include <net/arp.h>
31 #include <net/ndisc.h>
32 #include <net/ip.h>
33 #include <net/ip_tunnels.h>
34 #include <net/icmp.h>
35 #include <net/udp.h>
36 #include <net/rtnetlink.h>
37 #include <net/route.h>
38 #include <net/dsfield.h>
39 #include <net/inet_ecn.h>
40 #include <net/net_namespace.h>
41 #include <net/netns/generic.h>
42 #include <net/vxlan.h>
43 #if IS_ENABLED(CONFIG_IPV6)
44 #include <net/ipv6.h>
45 #include <net/addrconf.h>
46 #include <net/ip6_tunnel.h>
47 #include <net/ip6_checksum.h>
48 #endif
49
50 #define VXLAN_VERSION "0.1"
51
52 #define PORT_HASH_BITS 8
53 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
54 #define VNI_HASH_BITS 10
55 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
56 #define FDB_HASH_BITS 8
57 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
58 #define FDB_AGE_DEFAULT 300 /* 5 min */
59 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
60
61 #define VXLAN_N_VID (1u << 24)
62 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
63 /* IP header + UDP + VXLAN + Ethernet header */
64 #define VXLAN_HEADROOM (20 + 8 + 8 + 14)
65 /* IPv6 header + UDP + VXLAN + Ethernet header */
66 #define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
67 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
68
69 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
70
71 /* VXLAN protocol header */
72 struct vxlanhdr {
73 __be32 vx_flags;
74 __be32 vx_vni;
75 };
76
77 /* UDP port for VXLAN traffic.
78 * The IANA assigned port is 4789, but the Linux default is 8472
79 * for compatibility with early adopters.
80 */
81 static unsigned short vxlan_port __read_mostly = 8472;
82 module_param_named(udp_port, vxlan_port, ushort, 0444);
83 MODULE_PARM_DESC(udp_port, "Destination UDP port");
84
85 static bool log_ecn_error = true;
86 module_param(log_ecn_error, bool, 0644);
87 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
88
89 static int vxlan_net_id;
90
91 static const u8 all_zeros_mac[ETH_ALEN];
92
93 /* per-network namespace private data for this module */
94 struct vxlan_net {
95 struct list_head vxlan_list;
96 struct hlist_head sock_list[PORT_HASH_SIZE];
97 spinlock_t sock_lock;
98 };
99
100 union vxlan_addr {
101 struct sockaddr_in sin;
102 struct sockaddr_in6 sin6;
103 struct sockaddr sa;
104 };
105
106 struct vxlan_rdst {
107 union vxlan_addr remote_ip;
108 __be16 remote_port;
109 u32 remote_vni;
110 u32 remote_ifindex;
111 struct list_head list;
112 struct rcu_head rcu;
113 };
114
115 /* Forwarding table entry */
116 struct vxlan_fdb {
117 struct hlist_node hlist; /* linked list of entries */
118 struct rcu_head rcu;
119 unsigned long updated; /* jiffies */
120 unsigned long used;
121 struct list_head remotes;
122 u16 state; /* see ndm_state */
123 u8 flags; /* see ndm_flags */
124 u8 eth_addr[ETH_ALEN];
125 };
126
127 /* Pseudo network device */
128 struct vxlan_dev {
129 struct hlist_node hlist; /* vni hash table */
130 struct list_head next; /* vxlan's per namespace list */
131 struct vxlan_sock *vn_sock; /* listening socket */
132 struct net_device *dev;
133 struct vxlan_rdst default_dst; /* default destination */
134 union vxlan_addr saddr; /* source address */
135 __be16 dst_port;
136 __u16 port_min; /* source port range */
137 __u16 port_max;
138 __u8 tos; /* TOS override */
139 __u8 ttl;
140 u32 flags; /* VXLAN_F_* below */
141
142 struct work_struct sock_work;
143 struct work_struct igmp_join;
144 struct work_struct igmp_leave;
145
146 unsigned long age_interval;
147 struct timer_list age_timer;
148 spinlock_t hash_lock;
149 unsigned int addrcnt;
150 unsigned int addrmax;
151
152 struct hlist_head fdb_head[FDB_HASH_SIZE];
153 };
154
155 #define VXLAN_F_LEARN 0x01
156 #define VXLAN_F_PROXY 0x02
157 #define VXLAN_F_RSC 0x04
158 #define VXLAN_F_L2MISS 0x08
159 #define VXLAN_F_L3MISS 0x10
160 #define VXLAN_F_IPV6 0x20 /* internal flag */
161
162 /* salt for hash table */
163 static u32 vxlan_salt __read_mostly;
164 static struct workqueue_struct *vxlan_wq;
165
166 static void vxlan_sock_work(struct work_struct *work);
167
168 #if IS_ENABLED(CONFIG_IPV6)
169 static inline
170 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
171 {
172 if (a->sa.sa_family != b->sa.sa_family)
173 return false;
174 if (a->sa.sa_family == AF_INET6)
175 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
176 else
177 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
178 }
179
180 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
181 {
182 if (ipa->sa.sa_family == AF_INET6)
183 return ipv6_addr_any(&ipa->sin6.sin6_addr);
184 else
185 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
186 }
187
188 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
189 {
190 if (ipa->sa.sa_family == AF_INET6)
191 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
192 else
193 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
194 }
195
196 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
197 {
198 if (nla_len(nla) >= sizeof(struct in6_addr)) {
199 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
200 ip->sa.sa_family = AF_INET6;
201 return 0;
202 } else if (nla_len(nla) >= sizeof(__be32)) {
203 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
204 ip->sa.sa_family = AF_INET;
205 return 0;
206 } else {
207 return -EAFNOSUPPORT;
208 }
209 }
210
211 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
212 const union vxlan_addr *ip)
213 {
214 if (ip->sa.sa_family == AF_INET6)
215 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
216 else
217 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
218 }
219
220 #else /* !CONFIG_IPV6 */
221
222 static inline
223 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
224 {
225 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
226 }
227
228 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
229 {
230 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
231 }
232
233 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
234 {
235 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
236 }
237
238 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
239 {
240 if (nla_len(nla) >= sizeof(struct in6_addr)) {
241 return -EAFNOSUPPORT;
242 } else if (nla_len(nla) >= sizeof(__be32)) {
243 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
244 ip->sa.sa_family = AF_INET;
245 return 0;
246 } else {
247 return -EAFNOSUPPORT;
248 }
249 }
250
251 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
252 const union vxlan_addr *ip)
253 {
254 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
255 }
256 #endif
257
258 /* Virtual Network hash table head */
259 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
260 {
261 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
262 }
263
264 /* Socket hash table head */
265 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
266 {
267 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
268
269 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
270 }
271
272 /* First remote destination for a forwarding entry.
273 * Guaranteed to be non-NULL because remotes are never deleted.
274 */
275 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
276 {
277 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
278 }
279
280 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
281 {
282 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
283 }
284
285 /* Find VXLAN socket based on network namespace and UDP port */
286 static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
287 {
288 struct vxlan_sock *vs;
289
290 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
291 if (inet_sk(vs->sock->sk)->inet_sport == port)
292 return vs;
293 }
294 return NULL;
295 }
296
297 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
298 {
299 struct vxlan_dev *vxlan;
300
301 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
302 if (vxlan->default_dst.remote_vni == id)
303 return vxlan;
304 }
305
306 return NULL;
307 }
308
309 /* Look up VNI in a per net namespace table */
310 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
311 {
312 struct vxlan_sock *vs;
313
314 vs = vxlan_find_sock(net, port);
315 if (!vs)
316 return NULL;
317
318 return vxlan_vs_find_vni(vs, id);
319 }
320
321 /* Fill in neighbour message in skbuff. */
322 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
323 const struct vxlan_fdb *fdb,
324 u32 portid, u32 seq, int type, unsigned int flags,
325 const struct vxlan_rdst *rdst)
326 {
327 unsigned long now = jiffies;
328 struct nda_cacheinfo ci;
329 struct nlmsghdr *nlh;
330 struct ndmsg *ndm;
331 bool send_ip, send_eth;
332
333 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
334 if (nlh == NULL)
335 return -EMSGSIZE;
336
337 ndm = nlmsg_data(nlh);
338 memset(ndm, 0, sizeof(*ndm));
339
340 send_eth = send_ip = true;
341
342 if (type == RTM_GETNEIGH) {
343 ndm->ndm_family = AF_INET;
344 send_ip = !vxlan_addr_any(&rdst->remote_ip);
345 send_eth = !is_zero_ether_addr(fdb->eth_addr);
346 } else
347 ndm->ndm_family = AF_BRIDGE;
348 ndm->ndm_state = fdb->state;
349 ndm->ndm_ifindex = vxlan->dev->ifindex;
350 ndm->ndm_flags = fdb->flags;
351 ndm->ndm_type = NDA_DST;
352
353 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
354 goto nla_put_failure;
355
356 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
357 goto nla_put_failure;
358
359 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
360 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
361 goto nla_put_failure;
362 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
363 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
364 goto nla_put_failure;
365 if (rdst->remote_ifindex &&
366 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
367 goto nla_put_failure;
368
369 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
370 ci.ndm_confirmed = 0;
371 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
372 ci.ndm_refcnt = 0;
373
374 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
375 goto nla_put_failure;
376
377 return nlmsg_end(skb, nlh);
378
379 nla_put_failure:
380 nlmsg_cancel(skb, nlh);
381 return -EMSGSIZE;
382 }
383
384 static inline size_t vxlan_nlmsg_size(void)
385 {
386 return NLMSG_ALIGN(sizeof(struct ndmsg))
387 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
388 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
389 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
390 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
391 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
392 + nla_total_size(sizeof(struct nda_cacheinfo));
393 }
394
395 static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
396 struct vxlan_fdb *fdb, int type)
397 {
398 struct net *net = dev_net(vxlan->dev);
399 struct sk_buff *skb;
400 int err = -ENOBUFS;
401
402 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
403 if (skb == NULL)
404 goto errout;
405
406 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0,
407 first_remote_rtnl(fdb));
408 if (err < 0) {
409 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
410 WARN_ON(err == -EMSGSIZE);
411 kfree_skb(skb);
412 goto errout;
413 }
414
415 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
416 return;
417 errout:
418 if (err < 0)
419 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
420 }
421
422 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
423 {
424 struct vxlan_dev *vxlan = netdev_priv(dev);
425 struct vxlan_fdb f = {
426 .state = NUD_STALE,
427 };
428 struct vxlan_rdst remote = {
429 .remote_ip = *ipa, /* goes to NDA_DST */
430 .remote_vni = VXLAN_N_VID,
431 };
432
433 INIT_LIST_HEAD(&f.remotes);
434 list_add_rcu(&remote.list, &f.remotes);
435
436 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
437 }
438
439 static 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
445 INIT_LIST_HEAD(&f.remotes);
446 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
447
448 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
449 }
450
451 /* Hash Ethernet address */
452 static 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
465 /* Hash chain to use given mac address */
466 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
467 const u8 *mac)
468 {
469 return &vxlan->fdb_head[eth_hash(mac)];
470 }
471
472 /* Look up Ethernet address in forwarding table */
473 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
474 const u8 *mac)
475
476 {
477 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
478 struct vxlan_fdb *f;
479
480 hlist_for_each_entry_rcu(f, head, hlist) {
481 if (ether_addr_equal(mac, f->eth_addr))
482 return f;
483 }
484
485 return NULL;
486 }
487
488 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
489 const u8 *mac)
490 {
491 struct vxlan_fdb *f;
492
493 f = __vxlan_find_mac(vxlan, mac);
494 if (f)
495 f->used = jiffies;
496
497 return f;
498 }
499
500 /* caller should hold vxlan->hash_lock */
501 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
502 union vxlan_addr *ip, __be16 port,
503 __u32 vni, __u32 ifindex)
504 {
505 struct vxlan_rdst *rd;
506
507 list_for_each_entry(rd, &f->remotes, list) {
508 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
509 rd->remote_port == port &&
510 rd->remote_vni == vni &&
511 rd->remote_ifindex == ifindex)
512 return rd;
513 }
514
515 return NULL;
516 }
517
518 /* Replace destination of unicast mac */
519 static int vxlan_fdb_replace(struct vxlan_fdb *f,
520 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
521 {
522 struct vxlan_rdst *rd;
523
524 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
525 if (rd)
526 return 0;
527
528 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
529 if (!rd)
530 return 0;
531 rd->remote_ip = *ip;
532 rd->remote_port = port;
533 rd->remote_vni = vni;
534 rd->remote_ifindex = ifindex;
535 return 1;
536 }
537
538 /* Add/update destinations for multicast */
539 static int vxlan_fdb_append(struct vxlan_fdb *f,
540 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
541 {
542 struct vxlan_rdst *rd;
543
544 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
545 if (rd)
546 return 0;
547
548 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
549 if (rd == NULL)
550 return -ENOBUFS;
551 rd->remote_ip = *ip;
552 rd->remote_port = port;
553 rd->remote_vni = vni;
554 rd->remote_ifindex = ifindex;
555
556 list_add_tail_rcu(&rd->list, &f->remotes);
557
558 return 1;
559 }
560
561 /* Notify netdevs that UDP port started listening */
562 static void vxlan_notify_add_rx_port(struct sock *sk)
563 {
564 struct net_device *dev;
565 struct net *net = sock_net(sk);
566 sa_family_t sa_family = sk->sk_family;
567 __be16 port = inet_sk(sk)->inet_sport;
568
569 rcu_read_lock();
570 for_each_netdev_rcu(net, dev) {
571 if (dev->netdev_ops->ndo_add_vxlan_port)
572 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
573 port);
574 }
575 rcu_read_unlock();
576 }
577
578 /* Notify netdevs that UDP port is no more listening */
579 static void vxlan_notify_del_rx_port(struct sock *sk)
580 {
581 struct net_device *dev;
582 struct net *net = sock_net(sk);
583 sa_family_t sa_family = sk->sk_family;
584 __be16 port = inet_sk(sk)->inet_sport;
585
586 rcu_read_lock();
587 for_each_netdev_rcu(net, dev) {
588 if (dev->netdev_ops->ndo_del_vxlan_port)
589 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
590 port);
591 }
592 rcu_read_unlock();
593 }
594
595 /* Add new entry to forwarding table -- assumes lock held */
596 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
597 const u8 *mac, union vxlan_addr *ip,
598 __u16 state, __u16 flags,
599 __be16 port, __u32 vni, __u32 ifindex,
600 __u8 ndm_flags)
601 {
602 struct vxlan_fdb *f;
603 int notify = 0;
604
605 f = __vxlan_find_mac(vxlan, mac);
606 if (f) {
607 if (flags & NLM_F_EXCL) {
608 netdev_dbg(vxlan->dev,
609 "lost race to create %pM\n", mac);
610 return -EEXIST;
611 }
612 if (f->state != state) {
613 f->state = state;
614 f->updated = jiffies;
615 notify = 1;
616 }
617 if (f->flags != ndm_flags) {
618 f->flags = ndm_flags;
619 f->updated = jiffies;
620 notify = 1;
621 }
622 if ((flags & NLM_F_REPLACE)) {
623 /* Only change unicasts */
624 if (!(is_multicast_ether_addr(f->eth_addr) ||
625 is_zero_ether_addr(f->eth_addr))) {
626 int rc = vxlan_fdb_replace(f, ip, port, vni,
627 ifindex);
628
629 if (rc < 0)
630 return rc;
631 notify |= rc;
632 } else
633 return -EOPNOTSUPP;
634 }
635 if ((flags & NLM_F_APPEND) &&
636 (is_multicast_ether_addr(f->eth_addr) ||
637 is_zero_ether_addr(f->eth_addr))) {
638 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex);
639
640 if (rc < 0)
641 return rc;
642 notify |= rc;
643 }
644 } else {
645 if (!(flags & NLM_F_CREATE))
646 return -ENOENT;
647
648 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
649 return -ENOSPC;
650
651 /* Disallow replace to add a multicast entry */
652 if ((flags & NLM_F_REPLACE) &&
653 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
654 return -EOPNOTSUPP;
655
656 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
657 f = kmalloc(sizeof(*f), GFP_ATOMIC);
658 if (!f)
659 return -ENOMEM;
660
661 notify = 1;
662 f->state = state;
663 f->flags = ndm_flags;
664 f->updated = f->used = jiffies;
665 INIT_LIST_HEAD(&f->remotes);
666 memcpy(f->eth_addr, mac, ETH_ALEN);
667
668 vxlan_fdb_append(f, ip, port, vni, ifindex);
669
670 ++vxlan->addrcnt;
671 hlist_add_head_rcu(&f->hlist,
672 vxlan_fdb_head(vxlan, mac));
673 }
674
675 if (notify)
676 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
677
678 return 0;
679 }
680
681 static void vxlan_fdb_free(struct rcu_head *head)
682 {
683 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
684 struct vxlan_rdst *rd, *nd;
685
686 list_for_each_entry_safe(rd, nd, &f->remotes, list)
687 kfree(rd);
688 kfree(f);
689 }
690
691 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
692 {
693 netdev_dbg(vxlan->dev,
694 "delete %pM\n", f->eth_addr);
695
696 --vxlan->addrcnt;
697 vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
698
699 hlist_del_rcu(&f->hlist);
700 call_rcu(&f->rcu, vxlan_fdb_free);
701 }
702
703 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
704 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
705 {
706 struct net *net = dev_net(vxlan->dev);
707 int err;
708
709 if (tb[NDA_DST]) {
710 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
711 if (err)
712 return err;
713 } else {
714 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
715 if (remote->sa.sa_family == AF_INET) {
716 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
717 ip->sa.sa_family = AF_INET;
718 #if IS_ENABLED(CONFIG_IPV6)
719 } else {
720 ip->sin6.sin6_addr = in6addr_any;
721 ip->sa.sa_family = AF_INET6;
722 #endif
723 }
724 }
725
726 if (tb[NDA_PORT]) {
727 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
728 return -EINVAL;
729 *port = nla_get_be16(tb[NDA_PORT]);
730 } else {
731 *port = vxlan->dst_port;
732 }
733
734 if (tb[NDA_VNI]) {
735 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
736 return -EINVAL;
737 *vni = nla_get_u32(tb[NDA_VNI]);
738 } else {
739 *vni = vxlan->default_dst.remote_vni;
740 }
741
742 if (tb[NDA_IFINDEX]) {
743 struct net_device *tdev;
744
745 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
746 return -EINVAL;
747 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
748 tdev = dev_get_by_index(net, *ifindex);
749 if (!tdev)
750 return -EADDRNOTAVAIL;
751 dev_put(tdev);
752 } else {
753 *ifindex = 0;
754 }
755
756 return 0;
757 }
758
759 /* Add static entry (via netlink) */
760 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
761 struct net_device *dev,
762 const unsigned char *addr, u16 flags)
763 {
764 struct vxlan_dev *vxlan = netdev_priv(dev);
765 /* struct net *net = dev_net(vxlan->dev); */
766 union vxlan_addr ip;
767 __be16 port;
768 u32 vni, ifindex;
769 int err;
770
771 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
772 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
773 ndm->ndm_state);
774 return -EINVAL;
775 }
776
777 if (tb[NDA_DST] == NULL)
778 return -EINVAL;
779
780 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
781 if (err)
782 return err;
783
784 spin_lock_bh(&vxlan->hash_lock);
785 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
786 port, vni, ifindex, ndm->ndm_flags);
787 spin_unlock_bh(&vxlan->hash_lock);
788
789 return err;
790 }
791
792 /* Delete entry (via netlink) */
793 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
794 struct net_device *dev,
795 const unsigned char *addr)
796 {
797 struct vxlan_dev *vxlan = netdev_priv(dev);
798 struct vxlan_fdb *f;
799 struct vxlan_rdst *rd = NULL;
800 union vxlan_addr ip;
801 __be16 port;
802 u32 vni, ifindex;
803 int err;
804
805 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
806 if (err)
807 return err;
808
809 err = -ENOENT;
810
811 spin_lock_bh(&vxlan->hash_lock);
812 f = vxlan_find_mac(vxlan, addr);
813 if (!f)
814 goto out;
815
816 if (!vxlan_addr_any(&ip)) {
817 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
818 if (!rd)
819 goto out;
820 }
821
822 err = 0;
823
824 /* remove a destination if it's not the only one on the list,
825 * otherwise destroy the fdb entry
826 */
827 if (rd && !list_is_singular(&f->remotes)) {
828 list_del_rcu(&rd->list);
829 kfree_rcu(rd, rcu);
830 goto out;
831 }
832
833 vxlan_fdb_destroy(vxlan, f);
834
835 out:
836 spin_unlock_bh(&vxlan->hash_lock);
837
838 return err;
839 }
840
841 /* Dump forwarding table */
842 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
843 struct net_device *dev, int idx)
844 {
845 struct vxlan_dev *vxlan = netdev_priv(dev);
846 unsigned int h;
847
848 for (h = 0; h < FDB_HASH_SIZE; ++h) {
849 struct vxlan_fdb *f;
850 int err;
851
852 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
853 struct vxlan_rdst *rd;
854
855 if (idx < cb->args[0])
856 goto skip;
857
858 list_for_each_entry_rcu(rd, &f->remotes, list) {
859 err = vxlan_fdb_info(skb, vxlan, f,
860 NETLINK_CB(cb->skb).portid,
861 cb->nlh->nlmsg_seq,
862 RTM_NEWNEIGH,
863 NLM_F_MULTI, rd);
864 if (err < 0)
865 goto out;
866 }
867 skip:
868 ++idx;
869 }
870 }
871 out:
872 return idx;
873 }
874
875 /* Watch incoming packets to learn mapping between Ethernet address
876 * and Tunnel endpoint.
877 * Return true if packet is bogus and should be droppped.
878 */
879 static bool vxlan_snoop(struct net_device *dev,
880 union vxlan_addr *src_ip, const u8 *src_mac)
881 {
882 struct vxlan_dev *vxlan = netdev_priv(dev);
883 struct vxlan_fdb *f;
884
885 f = vxlan_find_mac(vxlan, src_mac);
886 if (likely(f)) {
887 struct vxlan_rdst *rdst = first_remote_rcu(f);
888
889 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
890 return false;
891
892 /* Don't migrate static entries, drop packets */
893 if (f->state & NUD_NOARP)
894 return true;
895
896 if (net_ratelimit())
897 netdev_info(dev,
898 "%pM migrated from %pIS to %pIS\n",
899 src_mac, &rdst->remote_ip, &src_ip);
900
901 rdst->remote_ip = *src_ip;
902 f->updated = jiffies;
903 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
904 } else {
905 /* learned new entry */
906 spin_lock(&vxlan->hash_lock);
907
908 /* close off race between vxlan_flush and incoming packets */
909 if (netif_running(dev))
910 vxlan_fdb_create(vxlan, src_mac, src_ip,
911 NUD_REACHABLE,
912 NLM_F_EXCL|NLM_F_CREATE,
913 vxlan->dst_port,
914 vxlan->default_dst.remote_vni,
915 0, NTF_SELF);
916 spin_unlock(&vxlan->hash_lock);
917 }
918
919 return false;
920 }
921
922 /* See if multicast group is already in use by other ID */
923 static bool vxlan_group_used(struct vxlan_net *vn, union vxlan_addr *remote_ip)
924 {
925 struct vxlan_dev *vxlan;
926
927 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
928 if (!netif_running(vxlan->dev))
929 continue;
930
931 if (vxlan_addr_equal(&vxlan->default_dst.remote_ip,
932 remote_ip))
933 return true;
934 }
935
936 return false;
937 }
938
939 static void vxlan_sock_hold(struct vxlan_sock *vs)
940 {
941 atomic_inc(&vs->refcnt);
942 }
943
944 void vxlan_sock_release(struct vxlan_sock *vs)
945 {
946 struct sock *sk = vs->sock->sk;
947 struct net *net = sock_net(sk);
948 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
949
950 if (!atomic_dec_and_test(&vs->refcnt))
951 return;
952
953 spin_lock(&vn->sock_lock);
954 hlist_del_rcu(&vs->hlist);
955 rcu_assign_sk_user_data(vs->sock->sk, NULL);
956 vxlan_notify_del_rx_port(sk);
957 spin_unlock(&vn->sock_lock);
958
959 queue_work(vxlan_wq, &vs->del_work);
960 }
961 EXPORT_SYMBOL_GPL(vxlan_sock_release);
962
963 /* Callback to update multicast group membership when first VNI on
964 * multicast asddress is brought up
965 * Done as workqueue because ip_mc_join_group acquires RTNL.
966 */
967 static void vxlan_igmp_join(struct work_struct *work)
968 {
969 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
970 struct vxlan_sock *vs = vxlan->vn_sock;
971 struct sock *sk = vs->sock->sk;
972 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
973 int ifindex = vxlan->default_dst.remote_ifindex;
974
975 lock_sock(sk);
976 if (ip->sa.sa_family == AF_INET) {
977 struct ip_mreqn mreq = {
978 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
979 .imr_ifindex = ifindex,
980 };
981
982 ip_mc_join_group(sk, &mreq);
983 #if IS_ENABLED(CONFIG_IPV6)
984 } else {
985 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
986 &ip->sin6.sin6_addr);
987 #endif
988 }
989 release_sock(sk);
990
991 vxlan_sock_release(vs);
992 dev_put(vxlan->dev);
993 }
994
995 /* Inverse of vxlan_igmp_join when last VNI is brought down */
996 static void vxlan_igmp_leave(struct work_struct *work)
997 {
998 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
999 struct vxlan_sock *vs = vxlan->vn_sock;
1000 struct sock *sk = vs->sock->sk;
1001 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1002 int ifindex = vxlan->default_dst.remote_ifindex;
1003
1004 lock_sock(sk);
1005 if (ip->sa.sa_family == AF_INET) {
1006 struct ip_mreqn mreq = {
1007 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1008 .imr_ifindex = ifindex,
1009 };
1010
1011 ip_mc_leave_group(sk, &mreq);
1012 #if IS_ENABLED(CONFIG_IPV6)
1013 } else {
1014 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1015 &ip->sin6.sin6_addr);
1016 #endif
1017 }
1018
1019 release_sock(sk);
1020
1021 vxlan_sock_release(vs);
1022 dev_put(vxlan->dev);
1023 }
1024
1025 /* Callback from net/ipv4/udp.c to receive packets */
1026 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1027 {
1028 struct vxlan_sock *vs;
1029 struct vxlanhdr *vxh;
1030 __be16 port;
1031
1032 /* Need Vxlan and inner Ethernet header to be present */
1033 if (!pskb_may_pull(skb, VXLAN_HLEN))
1034 goto error;
1035
1036 /* Return packets with reserved bits set */
1037 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1038 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1039 (vxh->vx_vni & htonl(0xff))) {
1040 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1041 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1042 goto error;
1043 }
1044
1045 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1046 goto drop;
1047
1048 port = inet_sk(sk)->inet_sport;
1049
1050 vs = rcu_dereference_sk_user_data(sk);
1051 if (!vs)
1052 goto drop;
1053
1054 vs->rcv(vs, skb, vxh->vx_vni);
1055 return 0;
1056
1057 drop:
1058 /* Consume bad packet */
1059 kfree_skb(skb);
1060 return 0;
1061
1062 error:
1063 /* Return non vxlan pkt */
1064 return 1;
1065 }
1066
1067 static void vxlan_rcv(struct vxlan_sock *vs,
1068 struct sk_buff *skb, __be32 vx_vni)
1069 {
1070 struct iphdr *oip = NULL;
1071 struct ipv6hdr *oip6 = NULL;
1072 struct vxlan_dev *vxlan;
1073 struct pcpu_tstats *stats;
1074 union vxlan_addr saddr;
1075 __u32 vni;
1076 int err = 0;
1077 union vxlan_addr *remote_ip;
1078
1079 vni = ntohl(vx_vni) >> 8;
1080 /* Is this VNI defined? */
1081 vxlan = vxlan_vs_find_vni(vs, vni);
1082 if (!vxlan)
1083 goto drop;
1084
1085 remote_ip = &vxlan->default_dst.remote_ip;
1086 skb_reset_mac_header(skb);
1087 skb->protocol = eth_type_trans(skb, vxlan->dev);
1088
1089 /* Ignore packet loops (and multicast echo) */
1090 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1091 goto drop;
1092
1093 /* Re-examine inner Ethernet packet */
1094 if (remote_ip->sa.sa_family == AF_INET) {
1095 oip = ip_hdr(skb);
1096 saddr.sin.sin_addr.s_addr = oip->saddr;
1097 saddr.sa.sa_family = AF_INET;
1098 #if IS_ENABLED(CONFIG_IPV6)
1099 } else {
1100 oip6 = ipv6_hdr(skb);
1101 saddr.sin6.sin6_addr = oip6->saddr;
1102 saddr.sa.sa_family = AF_INET6;
1103 #endif
1104 }
1105
1106 if ((vxlan->flags & VXLAN_F_LEARN) &&
1107 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1108 goto drop;
1109
1110 skb_reset_network_header(skb);
1111
1112 /* If the NIC driver gave us an encapsulated packet with
1113 * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled,
1114 * leave the CHECKSUM_UNNECESSARY, the device checksummed it
1115 * for us. Otherwise force the upper layers to verify it.
1116 */
1117 if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation ||
1118 !(vxlan->dev->features & NETIF_F_RXCSUM))
1119 skb->ip_summed = CHECKSUM_NONE;
1120
1121 skb->encapsulation = 0;
1122
1123 if (oip6)
1124 err = IP6_ECN_decapsulate(oip6, skb);
1125 if (oip)
1126 err = IP_ECN_decapsulate(oip, skb);
1127
1128 if (unlikely(err)) {
1129 if (log_ecn_error) {
1130 if (oip6)
1131 net_info_ratelimited("non-ECT from %pI6\n",
1132 &oip6->saddr);
1133 if (oip)
1134 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1135 &oip->saddr, oip->tos);
1136 }
1137 if (err > 1) {
1138 ++vxlan->dev->stats.rx_frame_errors;
1139 ++vxlan->dev->stats.rx_errors;
1140 goto drop;
1141 }
1142 }
1143
1144 stats = this_cpu_ptr(vxlan->dev->tstats);
1145 u64_stats_update_begin(&stats->syncp);
1146 stats->rx_packets++;
1147 stats->rx_bytes += skb->len;
1148 u64_stats_update_end(&stats->syncp);
1149
1150 netif_rx(skb);
1151
1152 return;
1153 drop:
1154 /* Consume bad packet */
1155 kfree_skb(skb);
1156 }
1157
1158 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1159 {
1160 struct vxlan_dev *vxlan = netdev_priv(dev);
1161 struct arphdr *parp;
1162 u8 *arpptr, *sha;
1163 __be32 sip, tip;
1164 struct neighbour *n;
1165
1166 if (dev->flags & IFF_NOARP)
1167 goto out;
1168
1169 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1170 dev->stats.tx_dropped++;
1171 goto out;
1172 }
1173 parp = arp_hdr(skb);
1174
1175 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1176 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1177 parp->ar_pro != htons(ETH_P_IP) ||
1178 parp->ar_op != htons(ARPOP_REQUEST) ||
1179 parp->ar_hln != dev->addr_len ||
1180 parp->ar_pln != 4)
1181 goto out;
1182 arpptr = (u8 *)parp + sizeof(struct arphdr);
1183 sha = arpptr;
1184 arpptr += dev->addr_len; /* sha */
1185 memcpy(&sip, arpptr, sizeof(sip));
1186 arpptr += sizeof(sip);
1187 arpptr += dev->addr_len; /* tha */
1188 memcpy(&tip, arpptr, sizeof(tip));
1189
1190 if (ipv4_is_loopback(tip) ||
1191 ipv4_is_multicast(tip))
1192 goto out;
1193
1194 n = neigh_lookup(&arp_tbl, &tip, dev);
1195
1196 if (n) {
1197 struct vxlan_fdb *f;
1198 struct sk_buff *reply;
1199
1200 if (!(n->nud_state & NUD_CONNECTED)) {
1201 neigh_release(n);
1202 goto out;
1203 }
1204
1205 f = vxlan_find_mac(vxlan, n->ha);
1206 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1207 /* bridge-local neighbor */
1208 neigh_release(n);
1209 goto out;
1210 }
1211
1212 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1213 n->ha, sha);
1214
1215 neigh_release(n);
1216
1217 skb_reset_mac_header(reply);
1218 __skb_pull(reply, skb_network_offset(reply));
1219 reply->ip_summed = CHECKSUM_UNNECESSARY;
1220 reply->pkt_type = PACKET_HOST;
1221
1222 if (netif_rx_ni(reply) == NET_RX_DROP)
1223 dev->stats.rx_dropped++;
1224 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1225 union vxlan_addr ipa = {
1226 .sin.sin_addr.s_addr = tip,
1227 .sa.sa_family = AF_INET,
1228 };
1229
1230 vxlan_ip_miss(dev, &ipa);
1231 }
1232 out:
1233 consume_skb(skb);
1234 return NETDEV_TX_OK;
1235 }
1236
1237 #if IS_ENABLED(CONFIG_IPV6)
1238 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1239 {
1240 struct vxlan_dev *vxlan = netdev_priv(dev);
1241 struct neighbour *n;
1242 union vxlan_addr ipa;
1243 const struct ipv6hdr *iphdr;
1244 const struct in6_addr *saddr, *daddr;
1245 struct nd_msg *msg;
1246 struct inet6_dev *in6_dev = NULL;
1247
1248 in6_dev = __in6_dev_get(dev);
1249 if (!in6_dev)
1250 goto out;
1251
1252 if (!pskb_may_pull(skb, skb->len))
1253 goto out;
1254
1255 iphdr = ipv6_hdr(skb);
1256 saddr = &iphdr->saddr;
1257 daddr = &iphdr->daddr;
1258
1259 if (ipv6_addr_loopback(daddr) ||
1260 ipv6_addr_is_multicast(daddr))
1261 goto out;
1262
1263 msg = (struct nd_msg *)skb_transport_header(skb);
1264 if (msg->icmph.icmp6_code != 0 ||
1265 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1266 goto out;
1267
1268 n = neigh_lookup(ipv6_stub->nd_tbl, daddr, dev);
1269
1270 if (n) {
1271 struct vxlan_fdb *f;
1272
1273 if (!(n->nud_state & NUD_CONNECTED)) {
1274 neigh_release(n);
1275 goto out;
1276 }
1277
1278 f = vxlan_find_mac(vxlan, n->ha);
1279 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1280 /* bridge-local neighbor */
1281 neigh_release(n);
1282 goto out;
1283 }
1284
1285 ipv6_stub->ndisc_send_na(dev, n, saddr, &msg->target,
1286 !!in6_dev->cnf.forwarding,
1287 true, false, false);
1288 neigh_release(n);
1289 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1290 ipa.sin6.sin6_addr = *daddr;
1291 ipa.sa.sa_family = AF_INET6;
1292 vxlan_ip_miss(dev, &ipa);
1293 }
1294
1295 out:
1296 consume_skb(skb);
1297 return NETDEV_TX_OK;
1298 }
1299 #endif
1300
1301 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1302 {
1303 struct vxlan_dev *vxlan = netdev_priv(dev);
1304 struct neighbour *n;
1305
1306 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1307 return false;
1308
1309 n = NULL;
1310 switch (ntohs(eth_hdr(skb)->h_proto)) {
1311 case ETH_P_IP:
1312 {
1313 struct iphdr *pip;
1314
1315 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1316 return false;
1317 pip = ip_hdr(skb);
1318 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1319 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1320 union vxlan_addr ipa = {
1321 .sin.sin_addr.s_addr = pip->daddr,
1322 .sa.sa_family = AF_INET,
1323 };
1324
1325 vxlan_ip_miss(dev, &ipa);
1326 return false;
1327 }
1328
1329 break;
1330 }
1331 #if IS_ENABLED(CONFIG_IPV6)
1332 case ETH_P_IPV6:
1333 {
1334 struct ipv6hdr *pip6;
1335
1336 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1337 return false;
1338 pip6 = ipv6_hdr(skb);
1339 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1340 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1341 union vxlan_addr ipa = {
1342 .sin6.sin6_addr = pip6->daddr,
1343 .sa.sa_family = AF_INET6,
1344 };
1345
1346 vxlan_ip_miss(dev, &ipa);
1347 return false;
1348 }
1349
1350 break;
1351 }
1352 #endif
1353 default:
1354 return false;
1355 }
1356
1357 if (n) {
1358 bool diff;
1359
1360 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1361 if (diff) {
1362 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1363 dev->addr_len);
1364 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1365 }
1366 neigh_release(n);
1367 return diff;
1368 }
1369
1370 return false;
1371 }
1372
1373 static void vxlan_sock_put(struct sk_buff *skb)
1374 {
1375 sock_put(skb->sk);
1376 }
1377
1378 /* On transmit, associate with the tunnel socket */
1379 static void vxlan_set_owner(struct sock *sk, struct sk_buff *skb)
1380 {
1381 skb_orphan(skb);
1382 sock_hold(sk);
1383 skb->sk = sk;
1384 skb->destructor = vxlan_sock_put;
1385 }
1386
1387 /* Compute source port for outgoing packet
1388 * first choice to use L4 flow hash since it will spread
1389 * better and maybe available from hardware
1390 * secondary choice is to use jhash on the Ethernet header
1391 */
1392 __be16 vxlan_src_port(__u16 port_min, __u16 port_max, struct sk_buff *skb)
1393 {
1394 unsigned int range = (port_max - port_min) + 1;
1395 u32 hash;
1396
1397 hash = skb_get_rxhash(skb);
1398 if (!hash)
1399 hash = jhash(skb->data, 2 * ETH_ALEN,
1400 (__force u32) skb->protocol);
1401
1402 return htons((((u64) hash * range) >> 32) + port_min);
1403 }
1404 EXPORT_SYMBOL_GPL(vxlan_src_port);
1405
1406 static int handle_offloads(struct sk_buff *skb)
1407 {
1408 if (skb_is_gso(skb)) {
1409 int err = skb_unclone(skb, GFP_ATOMIC);
1410 if (unlikely(err))
1411 return err;
1412
1413 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
1414 } else if (skb->ip_summed != CHECKSUM_PARTIAL)
1415 skb->ip_summed = CHECKSUM_NONE;
1416
1417 return 0;
1418 }
1419
1420 #if IS_ENABLED(CONFIG_IPV6)
1421 static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1422 struct dst_entry *dst, struct sk_buff *skb,
1423 struct net_device *dev, struct in6_addr *saddr,
1424 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1425 __be16 src_port, __be16 dst_port, __be32 vni)
1426 {
1427 struct ipv6hdr *ip6h;
1428 struct vxlanhdr *vxh;
1429 struct udphdr *uh;
1430 int min_headroom;
1431 int err;
1432
1433 if (!skb->encapsulation) {
1434 skb_reset_inner_headers(skb);
1435 skb->encapsulation = 1;
1436 }
1437
1438 skb_scrub_packet(skb, false);
1439
1440 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1441 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1442 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1443
1444 /* Need space for new headers (invalidates iph ptr) */
1445 err = skb_cow_head(skb, min_headroom);
1446 if (unlikely(err))
1447 return err;
1448
1449 if (vlan_tx_tag_present(skb)) {
1450 if (WARN_ON(!__vlan_put_tag(skb,
1451 skb->vlan_proto,
1452 vlan_tx_tag_get(skb))))
1453 return -ENOMEM;
1454
1455 skb->vlan_tci = 0;
1456 }
1457
1458 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1459 vxh->vx_flags = htonl(VXLAN_FLAGS);
1460 vxh->vx_vni = vni;
1461
1462 __skb_push(skb, sizeof(*uh));
1463 skb_reset_transport_header(skb);
1464 uh = udp_hdr(skb);
1465
1466 uh->dest = dst_port;
1467 uh->source = src_port;
1468
1469 uh->len = htons(skb->len);
1470 uh->check = 0;
1471
1472 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1473 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
1474 IPSKB_REROUTED);
1475 skb_dst_set(skb, dst);
1476
1477 if (!skb_is_gso(skb) && !(dst->dev->features & NETIF_F_IPV6_CSUM)) {
1478 __wsum csum = skb_checksum(skb, 0, skb->len, 0);
1479 skb->ip_summed = CHECKSUM_UNNECESSARY;
1480 uh->check = csum_ipv6_magic(saddr, daddr, skb->len,
1481 IPPROTO_UDP, csum);
1482 if (uh->check == 0)
1483 uh->check = CSUM_MANGLED_0;
1484 } else {
1485 skb->ip_summed = CHECKSUM_PARTIAL;
1486 skb->csum_start = skb_transport_header(skb) - skb->head;
1487 skb->csum_offset = offsetof(struct udphdr, check);
1488 uh->check = ~csum_ipv6_magic(saddr, daddr,
1489 skb->len, IPPROTO_UDP, 0);
1490 }
1491
1492 __skb_push(skb, sizeof(*ip6h));
1493 skb_reset_network_header(skb);
1494 ip6h = ipv6_hdr(skb);
1495 ip6h->version = 6;
1496 ip6h->priority = prio;
1497 ip6h->flow_lbl[0] = 0;
1498 ip6h->flow_lbl[1] = 0;
1499 ip6h->flow_lbl[2] = 0;
1500 ip6h->payload_len = htons(skb->len);
1501 ip6h->nexthdr = IPPROTO_UDP;
1502 ip6h->hop_limit = ttl;
1503 ip6h->daddr = *daddr;
1504 ip6h->saddr = *saddr;
1505
1506 vxlan_set_owner(vs->sock->sk, skb);
1507
1508 err = handle_offloads(skb);
1509 if (err)
1510 return err;
1511
1512 ip6tunnel_xmit(skb, dev);
1513 return 0;
1514 }
1515 #endif
1516
1517 int vxlan_xmit_skb(struct vxlan_sock *vs,
1518 struct rtable *rt, struct sk_buff *skb,
1519 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1520 __be16 src_port, __be16 dst_port, __be32 vni)
1521 {
1522 struct vxlanhdr *vxh;
1523 struct udphdr *uh;
1524 int min_headroom;
1525 int err;
1526
1527 if (!skb->encapsulation) {
1528 skb_reset_inner_headers(skb);
1529 skb->encapsulation = 1;
1530 }
1531
1532 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1533 + VXLAN_HLEN + sizeof(struct iphdr)
1534 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1535
1536 /* Need space for new headers (invalidates iph ptr) */
1537 err = skb_cow_head(skb, min_headroom);
1538 if (unlikely(err))
1539 return err;
1540
1541 if (vlan_tx_tag_present(skb)) {
1542 if (WARN_ON(!__vlan_put_tag(skb,
1543 skb->vlan_proto,
1544 vlan_tx_tag_get(skb))))
1545 return -ENOMEM;
1546
1547 skb->vlan_tci = 0;
1548 }
1549
1550 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1551 vxh->vx_flags = htonl(VXLAN_FLAGS);
1552 vxh->vx_vni = vni;
1553
1554 __skb_push(skb, sizeof(*uh));
1555 skb_reset_transport_header(skb);
1556 uh = udp_hdr(skb);
1557
1558 uh->dest = dst_port;
1559 uh->source = src_port;
1560
1561 uh->len = htons(skb->len);
1562 uh->check = 0;
1563
1564 vxlan_set_owner(vs->sock->sk, skb);
1565
1566 err = handle_offloads(skb);
1567 if (err)
1568 return err;
1569
1570 return iptunnel_xmit(rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df,
1571 false);
1572 }
1573 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1574
1575 /* Bypass encapsulation if the destination is local */
1576 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1577 struct vxlan_dev *dst_vxlan)
1578 {
1579 struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1580 struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1581 union vxlan_addr loopback;
1582 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1583
1584 skb->pkt_type = PACKET_HOST;
1585 skb->encapsulation = 0;
1586 skb->dev = dst_vxlan->dev;
1587 __skb_pull(skb, skb_network_offset(skb));
1588
1589 if (remote_ip->sa.sa_family == AF_INET) {
1590 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1591 loopback.sa.sa_family = AF_INET;
1592 #if IS_ENABLED(CONFIG_IPV6)
1593 } else {
1594 loopback.sin6.sin6_addr = in6addr_loopback;
1595 loopback.sa.sa_family = AF_INET6;
1596 #endif
1597 }
1598
1599 if (dst_vxlan->flags & VXLAN_F_LEARN)
1600 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1601
1602 u64_stats_update_begin(&tx_stats->syncp);
1603 tx_stats->tx_packets++;
1604 tx_stats->tx_bytes += skb->len;
1605 u64_stats_update_end(&tx_stats->syncp);
1606
1607 if (netif_rx(skb) == NET_RX_SUCCESS) {
1608 u64_stats_update_begin(&rx_stats->syncp);
1609 rx_stats->rx_packets++;
1610 rx_stats->rx_bytes += skb->len;
1611 u64_stats_update_end(&rx_stats->syncp);
1612 } else {
1613 skb->dev->stats.rx_dropped++;
1614 }
1615 }
1616
1617 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1618 struct vxlan_rdst *rdst, bool did_rsc)
1619 {
1620 struct vxlan_dev *vxlan = netdev_priv(dev);
1621 struct rtable *rt = NULL;
1622 const struct iphdr *old_iph;
1623 struct flowi4 fl4;
1624 union vxlan_addr *dst;
1625 __be16 src_port = 0, dst_port;
1626 u32 vni;
1627 __be16 df = 0;
1628 __u8 tos, ttl;
1629 int err;
1630
1631 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1632 vni = rdst->remote_vni;
1633 dst = &rdst->remote_ip;
1634
1635 if (vxlan_addr_any(dst)) {
1636 if (did_rsc) {
1637 /* short-circuited back to local bridge */
1638 vxlan_encap_bypass(skb, vxlan, vxlan);
1639 return;
1640 }
1641 goto drop;
1642 }
1643
1644 old_iph = ip_hdr(skb);
1645
1646 ttl = vxlan->ttl;
1647 if (!ttl && vxlan_addr_multicast(dst))
1648 ttl = 1;
1649
1650 tos = vxlan->tos;
1651 if (tos == 1)
1652 tos = ip_tunnel_get_dsfield(old_iph, skb);
1653
1654 src_port = vxlan_src_port(vxlan->port_min, vxlan->port_max, skb);
1655
1656 if (dst->sa.sa_family == AF_INET) {
1657 memset(&fl4, 0, sizeof(fl4));
1658 fl4.flowi4_oif = rdst->remote_ifindex;
1659 fl4.flowi4_tos = RT_TOS(tos);
1660 fl4.daddr = dst->sin.sin_addr.s_addr;
1661 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1662
1663 rt = ip_route_output_key(dev_net(dev), &fl4);
1664 if (IS_ERR(rt)) {
1665 netdev_dbg(dev, "no route to %pI4\n",
1666 &dst->sin.sin_addr.s_addr);
1667 dev->stats.tx_carrier_errors++;
1668 goto tx_error;
1669 }
1670
1671 if (rt->dst.dev == dev) {
1672 netdev_dbg(dev, "circular route to %pI4\n",
1673 &dst->sin.sin_addr.s_addr);
1674 dev->stats.collisions++;
1675 goto tx_error;
1676 }
1677
1678 /* Bypass encapsulation if the destination is local */
1679 if (rt->rt_flags & RTCF_LOCAL &&
1680 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1681 struct vxlan_dev *dst_vxlan;
1682
1683 ip_rt_put(rt);
1684 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1685 if (!dst_vxlan)
1686 goto tx_error;
1687 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1688 return;
1689 }
1690
1691 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1692 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1693
1694 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1695 fl4.saddr, dst->sin.sin_addr.s_addr,
1696 tos, ttl, df, src_port, dst_port,
1697 htonl(vni << 8));
1698
1699 if (err < 0)
1700 goto rt_tx_error;
1701 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1702 #if IS_ENABLED(CONFIG_IPV6)
1703 } else {
1704 struct sock *sk = vxlan->vn_sock->sock->sk;
1705 struct dst_entry *ndst;
1706 struct flowi6 fl6;
1707 u32 flags;
1708
1709 memset(&fl6, 0, sizeof(fl6));
1710 fl6.flowi6_oif = rdst->remote_ifindex;
1711 fl6.daddr = dst->sin6.sin6_addr;
1712 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1713 fl6.flowi6_proto = IPPROTO_UDP;
1714
1715 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1716 netdev_dbg(dev, "no route to %pI6\n",
1717 &dst->sin6.sin6_addr);
1718 dev->stats.tx_carrier_errors++;
1719 goto tx_error;
1720 }
1721
1722 if (ndst->dev == dev) {
1723 netdev_dbg(dev, "circular route to %pI6\n",
1724 &dst->sin6.sin6_addr);
1725 dst_release(ndst);
1726 dev->stats.collisions++;
1727 goto tx_error;
1728 }
1729
1730 /* Bypass encapsulation if the destination is local */
1731 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1732 if (flags & RTF_LOCAL &&
1733 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1734 struct vxlan_dev *dst_vxlan;
1735
1736 dst_release(ndst);
1737 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1738 if (!dst_vxlan)
1739 goto tx_error;
1740 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1741 return;
1742 }
1743
1744 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1745
1746 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
1747 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1748 src_port, dst_port, htonl(vni << 8));
1749 #endif
1750 }
1751
1752 return;
1753
1754 drop:
1755 dev->stats.tx_dropped++;
1756 goto tx_free;
1757
1758 rt_tx_error:
1759 ip_rt_put(rt);
1760 tx_error:
1761 dev->stats.tx_errors++;
1762 tx_free:
1763 dev_kfree_skb(skb);
1764 }
1765
1766 /* Transmit local packets over Vxlan
1767 *
1768 * Outer IP header inherits ECN and DF from inner header.
1769 * Outer UDP destination is the VXLAN assigned port.
1770 * source port is based on hash of flow
1771 */
1772 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1773 {
1774 struct vxlan_dev *vxlan = netdev_priv(dev);
1775 struct ethhdr *eth;
1776 bool did_rsc = false;
1777 struct vxlan_rdst *rdst;
1778 struct vxlan_fdb *f;
1779
1780 skb_reset_mac_header(skb);
1781 eth = eth_hdr(skb);
1782
1783 if ((vxlan->flags & VXLAN_F_PROXY)) {
1784 if (ntohs(eth->h_proto) == ETH_P_ARP)
1785 return arp_reduce(dev, skb);
1786 #if IS_ENABLED(CONFIG_IPV6)
1787 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1788 skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
1789 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1790 struct nd_msg *msg;
1791
1792 msg = (struct nd_msg *)skb_transport_header(skb);
1793 if (msg->icmph.icmp6_code == 0 &&
1794 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1795 return neigh_reduce(dev, skb);
1796 }
1797 #endif
1798 }
1799
1800 f = vxlan_find_mac(vxlan, eth->h_dest);
1801 did_rsc = false;
1802
1803 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1804 (ntohs(eth->h_proto) == ETH_P_IP ||
1805 ntohs(eth->h_proto) == ETH_P_IPV6)) {
1806 did_rsc = route_shortcircuit(dev, skb);
1807 if (did_rsc)
1808 f = vxlan_find_mac(vxlan, eth->h_dest);
1809 }
1810
1811 if (f == NULL) {
1812 f = vxlan_find_mac(vxlan, all_zeros_mac);
1813 if (f == NULL) {
1814 if ((vxlan->flags & VXLAN_F_L2MISS) &&
1815 !is_multicast_ether_addr(eth->h_dest))
1816 vxlan_fdb_miss(vxlan, eth->h_dest);
1817
1818 dev->stats.tx_dropped++;
1819 dev_kfree_skb(skb);
1820 return NETDEV_TX_OK;
1821 }
1822 }
1823
1824 list_for_each_entry_rcu(rdst, &f->remotes, list) {
1825 struct sk_buff *skb1;
1826
1827 skb1 = skb_clone(skb, GFP_ATOMIC);
1828 if (skb1)
1829 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1830 }
1831
1832 dev_kfree_skb(skb);
1833 return NETDEV_TX_OK;
1834 }
1835
1836 /* Walk the forwarding table and purge stale entries */
1837 static void vxlan_cleanup(unsigned long arg)
1838 {
1839 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1840 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1841 unsigned int h;
1842
1843 if (!netif_running(vxlan->dev))
1844 return;
1845
1846 spin_lock_bh(&vxlan->hash_lock);
1847 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1848 struct hlist_node *p, *n;
1849 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1850 struct vxlan_fdb *f
1851 = container_of(p, struct vxlan_fdb, hlist);
1852 unsigned long timeout;
1853
1854 if (f->state & NUD_PERMANENT)
1855 continue;
1856
1857 timeout = f->used + vxlan->age_interval * HZ;
1858 if (time_before_eq(timeout, jiffies)) {
1859 netdev_dbg(vxlan->dev,
1860 "garbage collect %pM\n",
1861 f->eth_addr);
1862 f->state = NUD_STALE;
1863 vxlan_fdb_destroy(vxlan, f);
1864 } else if (time_before(timeout, next_timer))
1865 next_timer = timeout;
1866 }
1867 }
1868 spin_unlock_bh(&vxlan->hash_lock);
1869
1870 mod_timer(&vxlan->age_timer, next_timer);
1871 }
1872
1873 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
1874 {
1875 __u32 vni = vxlan->default_dst.remote_vni;
1876
1877 vxlan->vn_sock = vs;
1878 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1879 }
1880
1881 /* Setup stats when device is created */
1882 static int vxlan_init(struct net_device *dev)
1883 {
1884 struct vxlan_dev *vxlan = netdev_priv(dev);
1885 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1886 struct vxlan_sock *vs;
1887
1888 dev->tstats = alloc_percpu(struct pcpu_tstats);
1889 if (!dev->tstats)
1890 return -ENOMEM;
1891
1892 spin_lock(&vn->sock_lock);
1893 vs = vxlan_find_sock(dev_net(dev), vxlan->dst_port);
1894 if (vs) {
1895 /* If we have a socket with same port already, reuse it */
1896 atomic_inc(&vs->refcnt);
1897 vxlan_vs_add_dev(vs, vxlan);
1898 } else {
1899 /* otherwise make new socket outside of RTNL */
1900 dev_hold(dev);
1901 queue_work(vxlan_wq, &vxlan->sock_work);
1902 }
1903 spin_unlock(&vn->sock_lock);
1904
1905 return 0;
1906 }
1907
1908 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
1909 {
1910 struct vxlan_fdb *f;
1911
1912 spin_lock_bh(&vxlan->hash_lock);
1913 f = __vxlan_find_mac(vxlan, all_zeros_mac);
1914 if (f)
1915 vxlan_fdb_destroy(vxlan, f);
1916 spin_unlock_bh(&vxlan->hash_lock);
1917 }
1918
1919 static void vxlan_uninit(struct net_device *dev)
1920 {
1921 struct vxlan_dev *vxlan = netdev_priv(dev);
1922 struct vxlan_sock *vs = vxlan->vn_sock;
1923
1924 vxlan_fdb_delete_default(vxlan);
1925
1926 if (vs)
1927 vxlan_sock_release(vs);
1928 free_percpu(dev->tstats);
1929 }
1930
1931 /* Start ageing timer and join group when device is brought up */
1932 static int vxlan_open(struct net_device *dev)
1933 {
1934 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1935 struct vxlan_dev *vxlan = netdev_priv(dev);
1936 struct vxlan_sock *vs = vxlan->vn_sock;
1937
1938 /* socket hasn't been created */
1939 if (!vs)
1940 return -ENOTCONN;
1941
1942 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
1943 vxlan_group_used(vn, &vxlan->default_dst.remote_ip)) {
1944 vxlan_sock_hold(vs);
1945 dev_hold(dev);
1946 queue_work(vxlan_wq, &vxlan->igmp_join);
1947 }
1948
1949 if (vxlan->age_interval)
1950 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
1951
1952 return 0;
1953 }
1954
1955 /* Purge the forwarding table */
1956 static void vxlan_flush(struct vxlan_dev *vxlan)
1957 {
1958 unsigned int h;
1959
1960 spin_lock_bh(&vxlan->hash_lock);
1961 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1962 struct hlist_node *p, *n;
1963 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1964 struct vxlan_fdb *f
1965 = container_of(p, struct vxlan_fdb, hlist);
1966 /* the all_zeros_mac entry is deleted at vxlan_uninit */
1967 if (!is_zero_ether_addr(f->eth_addr))
1968 vxlan_fdb_destroy(vxlan, f);
1969 }
1970 }
1971 spin_unlock_bh(&vxlan->hash_lock);
1972 }
1973
1974 /* Cleanup timer and forwarding table on shutdown */
1975 static int vxlan_stop(struct net_device *dev)
1976 {
1977 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1978 struct vxlan_dev *vxlan = netdev_priv(dev);
1979 struct vxlan_sock *vs = vxlan->vn_sock;
1980
1981 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
1982 ! vxlan_group_used(vn, &vxlan->default_dst.remote_ip)) {
1983 vxlan_sock_hold(vs);
1984 dev_hold(dev);
1985 queue_work(vxlan_wq, &vxlan->igmp_leave);
1986 }
1987
1988 del_timer_sync(&vxlan->age_timer);
1989
1990 vxlan_flush(vxlan);
1991
1992 return 0;
1993 }
1994
1995 /* Stub, nothing needs to be done. */
1996 static void vxlan_set_multicast_list(struct net_device *dev)
1997 {
1998 }
1999
2000 static const struct net_device_ops vxlan_netdev_ops = {
2001 .ndo_init = vxlan_init,
2002 .ndo_uninit = vxlan_uninit,
2003 .ndo_open = vxlan_open,
2004 .ndo_stop = vxlan_stop,
2005 .ndo_start_xmit = vxlan_xmit,
2006 .ndo_get_stats64 = ip_tunnel_get_stats64,
2007 .ndo_set_rx_mode = vxlan_set_multicast_list,
2008 .ndo_change_mtu = eth_change_mtu,
2009 .ndo_validate_addr = eth_validate_addr,
2010 .ndo_set_mac_address = eth_mac_addr,
2011 .ndo_fdb_add = vxlan_fdb_add,
2012 .ndo_fdb_del = vxlan_fdb_delete,
2013 .ndo_fdb_dump = vxlan_fdb_dump,
2014 };
2015
2016 /* Info for udev, that this is a virtual tunnel endpoint */
2017 static struct device_type vxlan_type = {
2018 .name = "vxlan",
2019 };
2020
2021 /* Calls the ndo_add_vxlan_port of the caller in order to
2022 * supply the listening VXLAN udp ports. Callers are expected
2023 * to implement the ndo_add_vxlan_port.
2024 */
2025 void vxlan_get_rx_port(struct net_device *dev)
2026 {
2027 struct vxlan_sock *vs;
2028 struct net *net = dev_net(dev);
2029 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2030 sa_family_t sa_family;
2031 __be16 port;
2032 unsigned int i;
2033
2034 spin_lock(&vn->sock_lock);
2035 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2036 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2037 port = inet_sk(vs->sock->sk)->inet_sport;
2038 sa_family = vs->sock->sk->sk_family;
2039 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2040 port);
2041 }
2042 }
2043 spin_unlock(&vn->sock_lock);
2044 }
2045 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2046
2047 /* Initialize the device structure. */
2048 static void vxlan_setup(struct net_device *dev)
2049 {
2050 struct vxlan_dev *vxlan = netdev_priv(dev);
2051 unsigned int h;
2052 int low, high;
2053
2054 eth_hw_addr_random(dev);
2055 ether_setup(dev);
2056 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2057 dev->hard_header_len = ETH_HLEN + VXLAN6_HEADROOM;
2058 else
2059 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
2060
2061 dev->netdev_ops = &vxlan_netdev_ops;
2062 dev->destructor = free_netdev;
2063 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2064
2065 dev->tx_queue_len = 0;
2066 dev->features |= NETIF_F_LLTX;
2067 dev->features |= NETIF_F_NETNS_LOCAL;
2068 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2069 dev->features |= NETIF_F_RXCSUM;
2070 dev->features |= NETIF_F_GSO_SOFTWARE;
2071
2072 dev->vlan_features = dev->features;
2073 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2074 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2075 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2076 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2077 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
2078 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2079
2080 INIT_LIST_HEAD(&vxlan->next);
2081 spin_lock_init(&vxlan->hash_lock);
2082 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2083 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2084 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2085
2086 init_timer_deferrable(&vxlan->age_timer);
2087 vxlan->age_timer.function = vxlan_cleanup;
2088 vxlan->age_timer.data = (unsigned long) vxlan;
2089
2090 inet_get_local_port_range(dev_net(dev), &low, &high);
2091 vxlan->port_min = low;
2092 vxlan->port_max = high;
2093 vxlan->dst_port = htons(vxlan_port);
2094
2095 vxlan->dev = dev;
2096
2097 for (h = 0; h < FDB_HASH_SIZE; ++h)
2098 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2099 }
2100
2101 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2102 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2103 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2104 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2105 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2106 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2107 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2108 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2109 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2110 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2111 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2112 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2113 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2114 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2115 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2116 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2117 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2118 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2119 };
2120
2121 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2122 {
2123 if (tb[IFLA_ADDRESS]) {
2124 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2125 pr_debug("invalid link address (not ethernet)\n");
2126 return -EINVAL;
2127 }
2128
2129 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2130 pr_debug("invalid all zero ethernet address\n");
2131 return -EADDRNOTAVAIL;
2132 }
2133 }
2134
2135 if (!data)
2136 return -EINVAL;
2137
2138 if (data[IFLA_VXLAN_ID]) {
2139 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2140 if (id >= VXLAN_VID_MASK)
2141 return -ERANGE;
2142 }
2143
2144 if (data[IFLA_VXLAN_PORT_RANGE]) {
2145 const struct ifla_vxlan_port_range *p
2146 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2147
2148 if (ntohs(p->high) < ntohs(p->low)) {
2149 pr_debug("port range %u .. %u not valid\n",
2150 ntohs(p->low), ntohs(p->high));
2151 return -EINVAL;
2152 }
2153 }
2154
2155 return 0;
2156 }
2157
2158 static void vxlan_get_drvinfo(struct net_device *netdev,
2159 struct ethtool_drvinfo *drvinfo)
2160 {
2161 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2162 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2163 }
2164
2165 static const struct ethtool_ops vxlan_ethtool_ops = {
2166 .get_drvinfo = vxlan_get_drvinfo,
2167 .get_link = ethtool_op_get_link,
2168 };
2169
2170 static void vxlan_del_work(struct work_struct *work)
2171 {
2172 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2173
2174 sk_release_kernel(vs->sock->sk);
2175 kfree_rcu(vs, rcu);
2176 }
2177
2178 #if IS_ENABLED(CONFIG_IPV6)
2179 /* Create UDP socket for encapsulation receive. AF_INET6 socket
2180 * could be used for both IPv4 and IPv6 communications, but
2181 * users may set bindv6only=1.
2182 */
2183 static struct socket *create_v6_sock(struct net *net, __be16 port)
2184 {
2185 struct sock *sk;
2186 struct socket *sock;
2187 struct sockaddr_in6 vxlan_addr = {
2188 .sin6_family = AF_INET6,
2189 .sin6_port = port,
2190 };
2191 int rc, val = 1;
2192
2193 rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
2194 if (rc < 0) {
2195 pr_debug("UDPv6 socket create failed\n");
2196 return ERR_PTR(rc);
2197 }
2198
2199 /* Put in proper namespace */
2200 sk = sock->sk;
2201 sk_change_net(sk, net);
2202
2203 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
2204 (char *)&val, sizeof(val));
2205 rc = kernel_bind(sock, (struct sockaddr *)&vxlan_addr,
2206 sizeof(struct sockaddr_in6));
2207 if (rc < 0) {
2208 pr_debug("bind for UDPv6 socket %pI6:%u (%d)\n",
2209 &vxlan_addr.sin6_addr, ntohs(vxlan_addr.sin6_port), rc);
2210 sk_release_kernel(sk);
2211 return ERR_PTR(rc);
2212 }
2213 /* At this point, IPv6 module should have been loaded in
2214 * sock_create_kern().
2215 */
2216 BUG_ON(!ipv6_stub);
2217
2218 /* Disable multicast loopback */
2219 inet_sk(sk)->mc_loop = 0;
2220 return sock;
2221 }
2222
2223 #else
2224
2225 static struct socket *create_v6_sock(struct net *net, __be16 port)
2226 {
2227 return ERR_PTR(-EPFNOSUPPORT);
2228 }
2229 #endif
2230
2231 static struct socket *create_v4_sock(struct net *net, __be16 port)
2232 {
2233 struct sock *sk;
2234 struct socket *sock;
2235 struct sockaddr_in vxlan_addr = {
2236 .sin_family = AF_INET,
2237 .sin_addr.s_addr = htonl(INADDR_ANY),
2238 .sin_port = port,
2239 };
2240 int rc;
2241
2242 /* Create UDP socket for encapsulation receive. */
2243 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
2244 if (rc < 0) {
2245 pr_debug("UDP socket create failed\n");
2246 return ERR_PTR(rc);
2247 }
2248
2249 /* Put in proper namespace */
2250 sk = sock->sk;
2251 sk_change_net(sk, net);
2252
2253 rc = kernel_bind(sock, (struct sockaddr *) &vxlan_addr,
2254 sizeof(vxlan_addr));
2255 if (rc < 0) {
2256 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
2257 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
2258 sk_release_kernel(sk);
2259 return ERR_PTR(rc);
2260 }
2261
2262 /* Disable multicast loopback */
2263 inet_sk(sk)->mc_loop = 0;
2264 return sock;
2265 }
2266
2267 /* Create new listen socket if needed */
2268 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2269 vxlan_rcv_t *rcv, void *data, bool ipv6)
2270 {
2271 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2272 struct vxlan_sock *vs;
2273 struct socket *sock;
2274 struct sock *sk;
2275 unsigned int h;
2276
2277 vs = kmalloc(sizeof(*vs), GFP_KERNEL);
2278 if (!vs)
2279 return ERR_PTR(-ENOMEM);
2280
2281 for (h = 0; h < VNI_HASH_SIZE; ++h)
2282 INIT_HLIST_HEAD(&vs->vni_list[h]);
2283
2284 INIT_WORK(&vs->del_work, vxlan_del_work);
2285
2286 if (ipv6)
2287 sock = create_v6_sock(net, port);
2288 else
2289 sock = create_v4_sock(net, port);
2290 if (IS_ERR(sock)) {
2291 kfree(vs);
2292 return ERR_PTR(PTR_ERR(sock));
2293 }
2294
2295 vs->sock = sock;
2296 sk = sock->sk;
2297 atomic_set(&vs->refcnt, 1);
2298 vs->rcv = rcv;
2299 vs->data = data;
2300 rcu_assign_sk_user_data(vs->sock->sk, vs);
2301
2302 spin_lock(&vn->sock_lock);
2303 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2304 vxlan_notify_add_rx_port(sk);
2305 spin_unlock(&vn->sock_lock);
2306
2307 /* Mark socket as an encapsulation socket. */
2308 udp_sk(sk)->encap_type = 1;
2309 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
2310 #if IS_ENABLED(CONFIG_IPV6)
2311 if (ipv6)
2312 ipv6_stub->udpv6_encap_enable();
2313 else
2314 #endif
2315 udp_encap_enable();
2316
2317 return vs;
2318 }
2319
2320 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2321 vxlan_rcv_t *rcv, void *data,
2322 bool no_share, bool ipv6)
2323 {
2324 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2325 struct vxlan_sock *vs;
2326
2327 vs = vxlan_socket_create(net, port, rcv, data, ipv6);
2328 if (!IS_ERR(vs))
2329 return vs;
2330
2331 if (no_share) /* Return error if sharing is not allowed. */
2332 return vs;
2333
2334 spin_lock(&vn->sock_lock);
2335 vs = vxlan_find_sock(net, port);
2336 if (vs) {
2337 if (vs->rcv == rcv)
2338 atomic_inc(&vs->refcnt);
2339 else
2340 vs = ERR_PTR(-EBUSY);
2341 }
2342 spin_unlock(&vn->sock_lock);
2343
2344 if (!vs)
2345 vs = ERR_PTR(-EINVAL);
2346
2347 return vs;
2348 }
2349 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2350
2351 /* Scheduled at device creation to bind to a socket */
2352 static void vxlan_sock_work(struct work_struct *work)
2353 {
2354 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2355 struct net *net = dev_net(vxlan->dev);
2356 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2357 __be16 port = vxlan->dst_port;
2358 struct vxlan_sock *nvs;
2359
2360 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags & VXLAN_F_IPV6);
2361 spin_lock(&vn->sock_lock);
2362 if (!IS_ERR(nvs))
2363 vxlan_vs_add_dev(nvs, vxlan);
2364 spin_unlock(&vn->sock_lock);
2365
2366 dev_put(vxlan->dev);
2367 }
2368
2369 static int vxlan_newlink(struct net *net, struct net_device *dev,
2370 struct nlattr *tb[], struct nlattr *data[])
2371 {
2372 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2373 struct vxlan_dev *vxlan = netdev_priv(dev);
2374 struct vxlan_rdst *dst = &vxlan->default_dst;
2375 __u32 vni;
2376 int err;
2377 bool use_ipv6 = false;
2378
2379 if (!data[IFLA_VXLAN_ID])
2380 return -EINVAL;
2381
2382 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2383 dst->remote_vni = vni;
2384
2385 if (data[IFLA_VXLAN_GROUP]) {
2386 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2387 dst->remote_ip.sa.sa_family = AF_INET;
2388 } else if (data[IFLA_VXLAN_GROUP6]) {
2389 if (!IS_ENABLED(CONFIG_IPV6))
2390 return -EPFNOSUPPORT;
2391
2392 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2393 sizeof(struct in6_addr));
2394 dst->remote_ip.sa.sa_family = AF_INET6;
2395 use_ipv6 = true;
2396 }
2397
2398 if (data[IFLA_VXLAN_LOCAL]) {
2399 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2400 vxlan->saddr.sa.sa_family = AF_INET;
2401 } else if (data[IFLA_VXLAN_LOCAL6]) {
2402 if (!IS_ENABLED(CONFIG_IPV6))
2403 return -EPFNOSUPPORT;
2404
2405 /* TODO: respect scope id */
2406 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2407 sizeof(struct in6_addr));
2408 vxlan->saddr.sa.sa_family = AF_INET6;
2409 use_ipv6 = true;
2410 }
2411
2412 if (data[IFLA_VXLAN_LINK] &&
2413 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2414 struct net_device *lowerdev
2415 = __dev_get_by_index(net, dst->remote_ifindex);
2416
2417 if (!lowerdev) {
2418 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2419 return -ENODEV;
2420 }
2421
2422 #if IS_ENABLED(CONFIG_IPV6)
2423 if (use_ipv6) {
2424 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2425 if (idev && idev->cnf.disable_ipv6) {
2426 pr_info("IPv6 is disabled via sysctl\n");
2427 return -EPERM;
2428 }
2429 vxlan->flags |= VXLAN_F_IPV6;
2430 }
2431 #endif
2432
2433 if (!tb[IFLA_MTU])
2434 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2435
2436 /* update header length based on lower device */
2437 dev->hard_header_len = lowerdev->hard_header_len +
2438 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2439 }
2440
2441 if (data[IFLA_VXLAN_TOS])
2442 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2443
2444 if (data[IFLA_VXLAN_TTL])
2445 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2446
2447 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2448 vxlan->flags |= VXLAN_F_LEARN;
2449
2450 if (data[IFLA_VXLAN_AGEING])
2451 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2452 else
2453 vxlan->age_interval = FDB_AGE_DEFAULT;
2454
2455 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2456 vxlan->flags |= VXLAN_F_PROXY;
2457
2458 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2459 vxlan->flags |= VXLAN_F_RSC;
2460
2461 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2462 vxlan->flags |= VXLAN_F_L2MISS;
2463
2464 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2465 vxlan->flags |= VXLAN_F_L3MISS;
2466
2467 if (data[IFLA_VXLAN_LIMIT])
2468 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2469
2470 if (data[IFLA_VXLAN_PORT_RANGE]) {
2471 const struct ifla_vxlan_port_range *p
2472 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2473 vxlan->port_min = ntohs(p->low);
2474 vxlan->port_max = ntohs(p->high);
2475 }
2476
2477 if (data[IFLA_VXLAN_PORT])
2478 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2479
2480 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
2481 pr_info("duplicate VNI %u\n", vni);
2482 return -EEXIST;
2483 }
2484
2485 SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
2486
2487 /* create an fdb entry for a valid default destination */
2488 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2489 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2490 &vxlan->default_dst.remote_ip,
2491 NUD_REACHABLE|NUD_PERMANENT,
2492 NLM_F_EXCL|NLM_F_CREATE,
2493 vxlan->dst_port,
2494 vxlan->default_dst.remote_vni,
2495 vxlan->default_dst.remote_ifindex,
2496 NTF_SELF);
2497 if (err)
2498 return err;
2499 }
2500
2501 err = register_netdevice(dev);
2502 if (err) {
2503 vxlan_fdb_delete_default(vxlan);
2504 return err;
2505 }
2506
2507 list_add(&vxlan->next, &vn->vxlan_list);
2508
2509 return 0;
2510 }
2511
2512 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2513 {
2514 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2515 struct vxlan_dev *vxlan = netdev_priv(dev);
2516
2517 spin_lock(&vn->sock_lock);
2518 if (!hlist_unhashed(&vxlan->hlist))
2519 hlist_del_rcu(&vxlan->hlist);
2520 spin_unlock(&vn->sock_lock);
2521
2522 list_del(&vxlan->next);
2523 unregister_netdevice_queue(dev, head);
2524 }
2525
2526 static size_t vxlan_get_size(const struct net_device *dev)
2527 {
2528
2529 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2530 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2531 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2532 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2533 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2534 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2535 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2536 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2537 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2538 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2539 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2540 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2541 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2542 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2543 nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
2544 0;
2545 }
2546
2547 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2548 {
2549 const struct vxlan_dev *vxlan = netdev_priv(dev);
2550 const struct vxlan_rdst *dst = &vxlan->default_dst;
2551 struct ifla_vxlan_port_range ports = {
2552 .low = htons(vxlan->port_min),
2553 .high = htons(vxlan->port_max),
2554 };
2555
2556 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2557 goto nla_put_failure;
2558
2559 if (!vxlan_addr_any(&dst->remote_ip)) {
2560 if (dst->remote_ip.sa.sa_family == AF_INET) {
2561 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2562 dst->remote_ip.sin.sin_addr.s_addr))
2563 goto nla_put_failure;
2564 #if IS_ENABLED(CONFIG_IPV6)
2565 } else {
2566 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2567 &dst->remote_ip.sin6.sin6_addr))
2568 goto nla_put_failure;
2569 #endif
2570 }
2571 }
2572
2573 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2574 goto nla_put_failure;
2575
2576 if (!vxlan_addr_any(&vxlan->saddr)) {
2577 if (vxlan->saddr.sa.sa_family == AF_INET) {
2578 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2579 vxlan->saddr.sin.sin_addr.s_addr))
2580 goto nla_put_failure;
2581 #if IS_ENABLED(CONFIG_IPV6)
2582 } else {
2583 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2584 &vxlan->saddr.sin6.sin6_addr))
2585 goto nla_put_failure;
2586 #endif
2587 }
2588 }
2589
2590 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2591 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2592 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2593 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2594 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2595 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2596 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2597 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2598 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2599 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2600 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2601 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2602 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2603 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
2604 goto nla_put_failure;
2605
2606 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2607 goto nla_put_failure;
2608
2609 return 0;
2610
2611 nla_put_failure:
2612 return -EMSGSIZE;
2613 }
2614
2615 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2616 .kind = "vxlan",
2617 .maxtype = IFLA_VXLAN_MAX,
2618 .policy = vxlan_policy,
2619 .priv_size = sizeof(struct vxlan_dev),
2620 .setup = vxlan_setup,
2621 .validate = vxlan_validate,
2622 .newlink = vxlan_newlink,
2623 .dellink = vxlan_dellink,
2624 .get_size = vxlan_get_size,
2625 .fill_info = vxlan_fill_info,
2626 };
2627
2628 static __net_init int vxlan_init_net(struct net *net)
2629 {
2630 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2631 unsigned int h;
2632
2633 INIT_LIST_HEAD(&vn->vxlan_list);
2634 spin_lock_init(&vn->sock_lock);
2635
2636 for (h = 0; h < PORT_HASH_SIZE; ++h)
2637 INIT_HLIST_HEAD(&vn->sock_list[h]);
2638
2639 return 0;
2640 }
2641
2642 static __net_exit void vxlan_exit_net(struct net *net)
2643 {
2644 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2645 struct vxlan_dev *vxlan;
2646 LIST_HEAD(list);
2647
2648 rtnl_lock();
2649 list_for_each_entry(vxlan, &vn->vxlan_list, next)
2650 unregister_netdevice_queue(vxlan->dev, &list);
2651 unregister_netdevice_many(&list);
2652 rtnl_unlock();
2653 }
2654
2655 static struct pernet_operations vxlan_net_ops = {
2656 .init = vxlan_init_net,
2657 .exit = vxlan_exit_net,
2658 .id = &vxlan_net_id,
2659 .size = sizeof(struct vxlan_net),
2660 };
2661
2662 static int __init vxlan_init_module(void)
2663 {
2664 int rc;
2665
2666 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2667 if (!vxlan_wq)
2668 return -ENOMEM;
2669
2670 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2671
2672 rc = register_pernet_device(&vxlan_net_ops);
2673 if (rc)
2674 goto out1;
2675
2676 rc = rtnl_link_register(&vxlan_link_ops);
2677 if (rc)
2678 goto out2;
2679
2680 return 0;
2681
2682 out2:
2683 unregister_pernet_device(&vxlan_net_ops);
2684 out1:
2685 destroy_workqueue(vxlan_wq);
2686 return rc;
2687 }
2688 late_initcall(vxlan_init_module);
2689
2690 static void __exit vxlan_cleanup_module(void)
2691 {
2692 rtnl_link_unregister(&vxlan_link_ops);
2693 destroy_workqueue(vxlan_wq);
2694 unregister_pernet_device(&vxlan_net_ops);
2695 rcu_barrier();
2696 }
2697 module_exit(vxlan_cleanup_module);
2698
2699 MODULE_LICENSE("GPL");
2700 MODULE_VERSION(VXLAN_VERSION);
2701 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
2702 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
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