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Merge remote-tracking branch 'wireless-next/master' into mac80211-next
[mirror_ubuntu-bionic-kernel.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 #include <net/protocol.h>
44 #if IS_ENABLED(CONFIG_IPV6)
45 #include <net/ipv6.h>
46 #include <net/addrconf.h>
47 #include <net/ip6_tunnel.h>
48 #include <net/ip6_checksum.h>
49 #endif
50
51 #define VXLAN_VERSION "0.1"
52
53 #define PORT_HASH_BITS 8
54 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
55 #define VNI_HASH_BITS 10
56 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
57 #define FDB_HASH_BITS 8
58 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
59 #define FDB_AGE_DEFAULT 300 /* 5 min */
60 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
61
62 #define VXLAN_N_VID (1u << 24)
63 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
64 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
65
66 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
67
68 /* VXLAN protocol header */
69 struct vxlanhdr {
70 __be32 vx_flags;
71 __be32 vx_vni;
72 };
73
74 /* UDP port for VXLAN traffic.
75 * The IANA assigned port is 4789, but the Linux default is 8472
76 * for compatibility with early adopters.
77 */
78 static unsigned short vxlan_port __read_mostly = 8472;
79 module_param_named(udp_port, vxlan_port, ushort, 0444);
80 MODULE_PARM_DESC(udp_port, "Destination UDP port");
81
82 static bool log_ecn_error = true;
83 module_param(log_ecn_error, bool, 0644);
84 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
85
86 static int vxlan_net_id;
87
88 static const u8 all_zeros_mac[ETH_ALEN];
89
90 /* per-network namespace private data for this module */
91 struct vxlan_net {
92 struct list_head vxlan_list;
93 struct hlist_head sock_list[PORT_HASH_SIZE];
94 spinlock_t sock_lock;
95 };
96
97 union vxlan_addr {
98 struct sockaddr_in sin;
99 struct sockaddr_in6 sin6;
100 struct sockaddr sa;
101 };
102
103 struct vxlan_rdst {
104 union vxlan_addr remote_ip;
105 __be16 remote_port;
106 u32 remote_vni;
107 u32 remote_ifindex;
108 struct list_head list;
109 struct rcu_head rcu;
110 };
111
112 /* Forwarding table entry */
113 struct vxlan_fdb {
114 struct hlist_node hlist; /* linked list of entries */
115 struct rcu_head rcu;
116 unsigned long updated; /* jiffies */
117 unsigned long used;
118 struct list_head remotes;
119 u16 state; /* see ndm_state */
120 u8 flags; /* see ndm_flags */
121 u8 eth_addr[ETH_ALEN];
122 };
123
124 /* Pseudo network device */
125 struct vxlan_dev {
126 struct hlist_node hlist; /* vni hash table */
127 struct list_head next; /* vxlan's per namespace list */
128 struct vxlan_sock *vn_sock; /* listening socket */
129 struct net_device *dev;
130 struct vxlan_rdst default_dst; /* default destination */
131 union vxlan_addr saddr; /* source address */
132 __be16 dst_port;
133 __u16 port_min; /* source port range */
134 __u16 port_max;
135 __u8 tos; /* TOS override */
136 __u8 ttl;
137 u32 flags; /* VXLAN_F_* below */
138
139 struct work_struct sock_work;
140 struct work_struct igmp_join;
141 struct work_struct igmp_leave;
142
143 unsigned long age_interval;
144 struct timer_list age_timer;
145 spinlock_t hash_lock;
146 unsigned int addrcnt;
147 unsigned int addrmax;
148
149 struct hlist_head fdb_head[FDB_HASH_SIZE];
150 };
151
152 #define VXLAN_F_LEARN 0x01
153 #define VXLAN_F_PROXY 0x02
154 #define VXLAN_F_RSC 0x04
155 #define VXLAN_F_L2MISS 0x08
156 #define VXLAN_F_L3MISS 0x10
157 #define VXLAN_F_IPV6 0x20 /* internal flag */
158
159 /* salt for hash table */
160 static u32 vxlan_salt __read_mostly;
161 static struct workqueue_struct *vxlan_wq;
162
163 static void vxlan_sock_work(struct work_struct *work);
164
165 #if IS_ENABLED(CONFIG_IPV6)
166 static inline
167 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
168 {
169 if (a->sa.sa_family != b->sa.sa_family)
170 return false;
171 if (a->sa.sa_family == AF_INET6)
172 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
173 else
174 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
175 }
176
177 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
178 {
179 if (ipa->sa.sa_family == AF_INET6)
180 return ipv6_addr_any(&ipa->sin6.sin6_addr);
181 else
182 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
183 }
184
185 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
186 {
187 if (ipa->sa.sa_family == AF_INET6)
188 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
189 else
190 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
191 }
192
193 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
194 {
195 if (nla_len(nla) >= sizeof(struct in6_addr)) {
196 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
197 ip->sa.sa_family = AF_INET6;
198 return 0;
199 } else if (nla_len(nla) >= sizeof(__be32)) {
200 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
201 ip->sa.sa_family = AF_INET;
202 return 0;
203 } else {
204 return -EAFNOSUPPORT;
205 }
206 }
207
208 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
209 const union vxlan_addr *ip)
210 {
211 if (ip->sa.sa_family == AF_INET6)
212 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
213 else
214 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
215 }
216
217 #else /* !CONFIG_IPV6 */
218
219 static inline
220 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
221 {
222 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
223 }
224
225 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
226 {
227 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
228 }
229
230 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
231 {
232 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
233 }
234
235 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
236 {
237 if (nla_len(nla) >= sizeof(struct in6_addr)) {
238 return -EAFNOSUPPORT;
239 } else if (nla_len(nla) >= sizeof(__be32)) {
240 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
241 ip->sa.sa_family = AF_INET;
242 return 0;
243 } else {
244 return -EAFNOSUPPORT;
245 }
246 }
247
248 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
249 const union vxlan_addr *ip)
250 {
251 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
252 }
253 #endif
254
255 /* Virtual Network hash table head */
256 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
257 {
258 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
259 }
260
261 /* Socket hash table head */
262 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
263 {
264 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
265
266 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
267 }
268
269 /* First remote destination for a forwarding entry.
270 * Guaranteed to be non-NULL because remotes are never deleted.
271 */
272 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
273 {
274 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
275 }
276
277 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
278 {
279 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
280 }
281
282 /* Find VXLAN socket based on network namespace and UDP port */
283 static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
284 {
285 struct vxlan_sock *vs;
286
287 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
288 if (inet_sk(vs->sock->sk)->inet_sport == port)
289 return vs;
290 }
291 return NULL;
292 }
293
294 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
295 {
296 struct vxlan_dev *vxlan;
297
298 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
299 if (vxlan->default_dst.remote_vni == id)
300 return vxlan;
301 }
302
303 return NULL;
304 }
305
306 /* Look up VNI in a per net namespace table */
307 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
308 {
309 struct vxlan_sock *vs;
310
311 vs = vxlan_find_sock(net, port);
312 if (!vs)
313 return NULL;
314
315 return vxlan_vs_find_vni(vs, id);
316 }
317
318 /* Fill in neighbour message in skbuff. */
319 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
320 const struct vxlan_fdb *fdb,
321 u32 portid, u32 seq, int type, unsigned int flags,
322 const struct vxlan_rdst *rdst)
323 {
324 unsigned long now = jiffies;
325 struct nda_cacheinfo ci;
326 struct nlmsghdr *nlh;
327 struct ndmsg *ndm;
328 bool send_ip, send_eth;
329
330 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
331 if (nlh == NULL)
332 return -EMSGSIZE;
333
334 ndm = nlmsg_data(nlh);
335 memset(ndm, 0, sizeof(*ndm));
336
337 send_eth = send_ip = true;
338
339 if (type == RTM_GETNEIGH) {
340 ndm->ndm_family = AF_INET;
341 send_ip = !vxlan_addr_any(&rdst->remote_ip);
342 send_eth = !is_zero_ether_addr(fdb->eth_addr);
343 } else
344 ndm->ndm_family = AF_BRIDGE;
345 ndm->ndm_state = fdb->state;
346 ndm->ndm_ifindex = vxlan->dev->ifindex;
347 ndm->ndm_flags = fdb->flags;
348 ndm->ndm_type = NDA_DST;
349
350 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
351 goto nla_put_failure;
352
353 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
354 goto nla_put_failure;
355
356 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
357 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
358 goto nla_put_failure;
359 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
360 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
361 goto nla_put_failure;
362 if (rdst->remote_ifindex &&
363 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
364 goto nla_put_failure;
365
366 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
367 ci.ndm_confirmed = 0;
368 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
369 ci.ndm_refcnt = 0;
370
371 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
372 goto nla_put_failure;
373
374 return nlmsg_end(skb, nlh);
375
376 nla_put_failure:
377 nlmsg_cancel(skb, nlh);
378 return -EMSGSIZE;
379 }
380
381 static inline size_t vxlan_nlmsg_size(void)
382 {
383 return NLMSG_ALIGN(sizeof(struct ndmsg))
384 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
385 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
386 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
387 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
388 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
389 + nla_total_size(sizeof(struct nda_cacheinfo));
390 }
391
392 static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
393 struct vxlan_fdb *fdb, int type)
394 {
395 struct net *net = dev_net(vxlan->dev);
396 struct sk_buff *skb;
397 int err = -ENOBUFS;
398
399 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
400 if (skb == NULL)
401 goto errout;
402
403 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0,
404 first_remote_rtnl(fdb));
405 if (err < 0) {
406 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
407 WARN_ON(err == -EMSGSIZE);
408 kfree_skb(skb);
409 goto errout;
410 }
411
412 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
413 return;
414 errout:
415 if (err < 0)
416 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
417 }
418
419 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
420 {
421 struct vxlan_dev *vxlan = netdev_priv(dev);
422 struct vxlan_fdb f = {
423 .state = NUD_STALE,
424 };
425 struct vxlan_rdst remote = {
426 .remote_ip = *ipa, /* goes to NDA_DST */
427 .remote_vni = VXLAN_N_VID,
428 };
429
430 INIT_LIST_HEAD(&f.remotes);
431 list_add_rcu(&remote.list, &f.remotes);
432
433 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
434 }
435
436 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
437 {
438 struct vxlan_fdb f = {
439 .state = NUD_STALE,
440 };
441
442 INIT_LIST_HEAD(&f.remotes);
443 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
444
445 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
446 }
447
448 /* Hash Ethernet address */
449 static u32 eth_hash(const unsigned char *addr)
450 {
451 u64 value = get_unaligned((u64 *)addr);
452
453 /* only want 6 bytes */
454 #ifdef __BIG_ENDIAN
455 value >>= 16;
456 #else
457 value <<= 16;
458 #endif
459 return hash_64(value, FDB_HASH_BITS);
460 }
461
462 /* Hash chain to use given mac address */
463 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
464 const u8 *mac)
465 {
466 return &vxlan->fdb_head[eth_hash(mac)];
467 }
468
469 /* Look up Ethernet address in forwarding table */
470 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
471 const u8 *mac)
472
473 {
474 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
475 struct vxlan_fdb *f;
476
477 hlist_for_each_entry_rcu(f, head, hlist) {
478 if (ether_addr_equal(mac, f->eth_addr))
479 return f;
480 }
481
482 return NULL;
483 }
484
485 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
486 const u8 *mac)
487 {
488 struct vxlan_fdb *f;
489
490 f = __vxlan_find_mac(vxlan, mac);
491 if (f)
492 f->used = jiffies;
493
494 return f;
495 }
496
497 /* caller should hold vxlan->hash_lock */
498 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
499 union vxlan_addr *ip, __be16 port,
500 __u32 vni, __u32 ifindex)
501 {
502 struct vxlan_rdst *rd;
503
504 list_for_each_entry(rd, &f->remotes, list) {
505 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
506 rd->remote_port == port &&
507 rd->remote_vni == vni &&
508 rd->remote_ifindex == ifindex)
509 return rd;
510 }
511
512 return NULL;
513 }
514
515 /* Replace destination of unicast mac */
516 static int vxlan_fdb_replace(struct vxlan_fdb *f,
517 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
518 {
519 struct vxlan_rdst *rd;
520
521 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
522 if (rd)
523 return 0;
524
525 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
526 if (!rd)
527 return 0;
528 rd->remote_ip = *ip;
529 rd->remote_port = port;
530 rd->remote_vni = vni;
531 rd->remote_ifindex = ifindex;
532 return 1;
533 }
534
535 /* Add/update destinations for multicast */
536 static int vxlan_fdb_append(struct vxlan_fdb *f,
537 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
538 {
539 struct vxlan_rdst *rd;
540
541 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
542 if (rd)
543 return 0;
544
545 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
546 if (rd == NULL)
547 return -ENOBUFS;
548 rd->remote_ip = *ip;
549 rd->remote_port = port;
550 rd->remote_vni = vni;
551 rd->remote_ifindex = ifindex;
552
553 list_add_tail_rcu(&rd->list, &f->remotes);
554
555 return 1;
556 }
557
558 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
559 {
560 struct sk_buff *p, **pp = NULL;
561 struct vxlanhdr *vh, *vh2;
562 struct ethhdr *eh, *eh2;
563 unsigned int hlen, off_vx, off_eth;
564 const struct packet_offload *ptype;
565 __be16 type;
566 int flush = 1;
567
568 off_vx = skb_gro_offset(skb);
569 hlen = off_vx + sizeof(*vh);
570 vh = skb_gro_header_fast(skb, off_vx);
571 if (skb_gro_header_hard(skb, hlen)) {
572 vh = skb_gro_header_slow(skb, hlen, off_vx);
573 if (unlikely(!vh))
574 goto out;
575 }
576 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
577
578 off_eth = skb_gro_offset(skb);
579 hlen = off_eth + sizeof(*eh);
580 eh = skb_gro_header_fast(skb, off_eth);
581 if (skb_gro_header_hard(skb, hlen)) {
582 eh = skb_gro_header_slow(skb, hlen, off_eth);
583 if (unlikely(!eh))
584 goto out;
585 }
586
587 flush = 0;
588
589 for (p = *head; p; p = p->next) {
590 if (!NAPI_GRO_CB(p)->same_flow)
591 continue;
592
593 vh2 = (struct vxlanhdr *)(p->data + off_vx);
594 eh2 = (struct ethhdr *)(p->data + off_eth);
595 if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
596 NAPI_GRO_CB(p)->same_flow = 0;
597 continue;
598 }
599 goto found;
600 }
601
602 found:
603 type = eh->h_proto;
604
605 rcu_read_lock();
606 ptype = gro_find_receive_by_type(type);
607 if (ptype == NULL) {
608 flush = 1;
609 goto out_unlock;
610 }
611
612 skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
613 pp = ptype->callbacks.gro_receive(head, skb);
614
615 out_unlock:
616 rcu_read_unlock();
617 out:
618 NAPI_GRO_CB(skb)->flush |= flush;
619
620 return pp;
621 }
622
623 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
624 {
625 struct ethhdr *eh;
626 struct packet_offload *ptype;
627 __be16 type;
628 int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
629 int err = -ENOSYS;
630
631 eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));
632 type = eh->h_proto;
633
634 rcu_read_lock();
635 ptype = gro_find_complete_by_type(type);
636 if (ptype != NULL)
637 err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len);
638
639 rcu_read_unlock();
640 return err;
641 }
642
643 /* Notify netdevs that UDP port started listening */
644 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
645 {
646 struct net_device *dev;
647 struct sock *sk = vs->sock->sk;
648 struct net *net = sock_net(sk);
649 sa_family_t sa_family = sk->sk_family;
650 __be16 port = inet_sk(sk)->inet_sport;
651 int err;
652
653 if (sa_family == AF_INET) {
654 err = udp_add_offload(&vs->udp_offloads);
655 if (err)
656 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
657 }
658
659 rcu_read_lock();
660 for_each_netdev_rcu(net, dev) {
661 if (dev->netdev_ops->ndo_add_vxlan_port)
662 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
663 port);
664 }
665 rcu_read_unlock();
666 }
667
668 /* Notify netdevs that UDP port is no more listening */
669 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
670 {
671 struct net_device *dev;
672 struct sock *sk = vs->sock->sk;
673 struct net *net = sock_net(sk);
674 sa_family_t sa_family = sk->sk_family;
675 __be16 port = inet_sk(sk)->inet_sport;
676
677 rcu_read_lock();
678 for_each_netdev_rcu(net, dev) {
679 if (dev->netdev_ops->ndo_del_vxlan_port)
680 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
681 port);
682 }
683 rcu_read_unlock();
684
685 if (sa_family == AF_INET)
686 udp_del_offload(&vs->udp_offloads);
687 }
688
689 /* Add new entry to forwarding table -- assumes lock held */
690 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
691 const u8 *mac, union vxlan_addr *ip,
692 __u16 state, __u16 flags,
693 __be16 port, __u32 vni, __u32 ifindex,
694 __u8 ndm_flags)
695 {
696 struct vxlan_fdb *f;
697 int notify = 0;
698
699 f = __vxlan_find_mac(vxlan, mac);
700 if (f) {
701 if (flags & NLM_F_EXCL) {
702 netdev_dbg(vxlan->dev,
703 "lost race to create %pM\n", mac);
704 return -EEXIST;
705 }
706 if (f->state != state) {
707 f->state = state;
708 f->updated = jiffies;
709 notify = 1;
710 }
711 if (f->flags != ndm_flags) {
712 f->flags = ndm_flags;
713 f->updated = jiffies;
714 notify = 1;
715 }
716 if ((flags & NLM_F_REPLACE)) {
717 /* Only change unicasts */
718 if (!(is_multicast_ether_addr(f->eth_addr) ||
719 is_zero_ether_addr(f->eth_addr))) {
720 int rc = vxlan_fdb_replace(f, ip, port, vni,
721 ifindex);
722
723 if (rc < 0)
724 return rc;
725 notify |= rc;
726 } else
727 return -EOPNOTSUPP;
728 }
729 if ((flags & NLM_F_APPEND) &&
730 (is_multicast_ether_addr(f->eth_addr) ||
731 is_zero_ether_addr(f->eth_addr))) {
732 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex);
733
734 if (rc < 0)
735 return rc;
736 notify |= rc;
737 }
738 } else {
739 if (!(flags & NLM_F_CREATE))
740 return -ENOENT;
741
742 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
743 return -ENOSPC;
744
745 /* Disallow replace to add a multicast entry */
746 if ((flags & NLM_F_REPLACE) &&
747 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
748 return -EOPNOTSUPP;
749
750 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
751 f = kmalloc(sizeof(*f), GFP_ATOMIC);
752 if (!f)
753 return -ENOMEM;
754
755 notify = 1;
756 f->state = state;
757 f->flags = ndm_flags;
758 f->updated = f->used = jiffies;
759 INIT_LIST_HEAD(&f->remotes);
760 memcpy(f->eth_addr, mac, ETH_ALEN);
761
762 vxlan_fdb_append(f, ip, port, vni, ifindex);
763
764 ++vxlan->addrcnt;
765 hlist_add_head_rcu(&f->hlist,
766 vxlan_fdb_head(vxlan, mac));
767 }
768
769 if (notify)
770 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
771
772 return 0;
773 }
774
775 static void vxlan_fdb_free(struct rcu_head *head)
776 {
777 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
778 struct vxlan_rdst *rd, *nd;
779
780 list_for_each_entry_safe(rd, nd, &f->remotes, list)
781 kfree(rd);
782 kfree(f);
783 }
784
785 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
786 {
787 netdev_dbg(vxlan->dev,
788 "delete %pM\n", f->eth_addr);
789
790 --vxlan->addrcnt;
791 vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
792
793 hlist_del_rcu(&f->hlist);
794 call_rcu(&f->rcu, vxlan_fdb_free);
795 }
796
797 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
798 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
799 {
800 struct net *net = dev_net(vxlan->dev);
801 int err;
802
803 if (tb[NDA_DST]) {
804 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
805 if (err)
806 return err;
807 } else {
808 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
809 if (remote->sa.sa_family == AF_INET) {
810 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
811 ip->sa.sa_family = AF_INET;
812 #if IS_ENABLED(CONFIG_IPV6)
813 } else {
814 ip->sin6.sin6_addr = in6addr_any;
815 ip->sa.sa_family = AF_INET6;
816 #endif
817 }
818 }
819
820 if (tb[NDA_PORT]) {
821 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
822 return -EINVAL;
823 *port = nla_get_be16(tb[NDA_PORT]);
824 } else {
825 *port = vxlan->dst_port;
826 }
827
828 if (tb[NDA_VNI]) {
829 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
830 return -EINVAL;
831 *vni = nla_get_u32(tb[NDA_VNI]);
832 } else {
833 *vni = vxlan->default_dst.remote_vni;
834 }
835
836 if (tb[NDA_IFINDEX]) {
837 struct net_device *tdev;
838
839 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
840 return -EINVAL;
841 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
842 tdev = __dev_get_by_index(net, *ifindex);
843 if (!tdev)
844 return -EADDRNOTAVAIL;
845 } else {
846 *ifindex = 0;
847 }
848
849 return 0;
850 }
851
852 /* Add static entry (via netlink) */
853 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
854 struct net_device *dev,
855 const unsigned char *addr, u16 flags)
856 {
857 struct vxlan_dev *vxlan = netdev_priv(dev);
858 /* struct net *net = dev_net(vxlan->dev); */
859 union vxlan_addr ip;
860 __be16 port;
861 u32 vni, ifindex;
862 int err;
863
864 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
865 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
866 ndm->ndm_state);
867 return -EINVAL;
868 }
869
870 if (tb[NDA_DST] == NULL)
871 return -EINVAL;
872
873 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
874 if (err)
875 return err;
876
877 spin_lock_bh(&vxlan->hash_lock);
878 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
879 port, vni, ifindex, ndm->ndm_flags);
880 spin_unlock_bh(&vxlan->hash_lock);
881
882 return err;
883 }
884
885 /* Delete entry (via netlink) */
886 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
887 struct net_device *dev,
888 const unsigned char *addr)
889 {
890 struct vxlan_dev *vxlan = netdev_priv(dev);
891 struct vxlan_fdb *f;
892 struct vxlan_rdst *rd = NULL;
893 union vxlan_addr ip;
894 __be16 port;
895 u32 vni, ifindex;
896 int err;
897
898 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
899 if (err)
900 return err;
901
902 err = -ENOENT;
903
904 spin_lock_bh(&vxlan->hash_lock);
905 f = vxlan_find_mac(vxlan, addr);
906 if (!f)
907 goto out;
908
909 if (!vxlan_addr_any(&ip)) {
910 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
911 if (!rd)
912 goto out;
913 }
914
915 err = 0;
916
917 /* remove a destination if it's not the only one on the list,
918 * otherwise destroy the fdb entry
919 */
920 if (rd && !list_is_singular(&f->remotes)) {
921 list_del_rcu(&rd->list);
922 kfree_rcu(rd, rcu);
923 goto out;
924 }
925
926 vxlan_fdb_destroy(vxlan, f);
927
928 out:
929 spin_unlock_bh(&vxlan->hash_lock);
930
931 return err;
932 }
933
934 /* Dump forwarding table */
935 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
936 struct net_device *dev, int idx)
937 {
938 struct vxlan_dev *vxlan = netdev_priv(dev);
939 unsigned int h;
940
941 for (h = 0; h < FDB_HASH_SIZE; ++h) {
942 struct vxlan_fdb *f;
943 int err;
944
945 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
946 struct vxlan_rdst *rd;
947
948 if (idx < cb->args[0])
949 goto skip;
950
951 list_for_each_entry_rcu(rd, &f->remotes, list) {
952 err = vxlan_fdb_info(skb, vxlan, f,
953 NETLINK_CB(cb->skb).portid,
954 cb->nlh->nlmsg_seq,
955 RTM_NEWNEIGH,
956 NLM_F_MULTI, rd);
957 if (err < 0)
958 goto out;
959 }
960 skip:
961 ++idx;
962 }
963 }
964 out:
965 return idx;
966 }
967
968 /* Watch incoming packets to learn mapping between Ethernet address
969 * and Tunnel endpoint.
970 * Return true if packet is bogus and should be droppped.
971 */
972 static bool vxlan_snoop(struct net_device *dev,
973 union vxlan_addr *src_ip, const u8 *src_mac)
974 {
975 struct vxlan_dev *vxlan = netdev_priv(dev);
976 struct vxlan_fdb *f;
977
978 f = vxlan_find_mac(vxlan, src_mac);
979 if (likely(f)) {
980 struct vxlan_rdst *rdst = first_remote_rcu(f);
981
982 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
983 return false;
984
985 /* Don't migrate static entries, drop packets */
986 if (f->state & NUD_NOARP)
987 return true;
988
989 if (net_ratelimit())
990 netdev_info(dev,
991 "%pM migrated from %pIS to %pIS\n",
992 src_mac, &rdst->remote_ip, &src_ip);
993
994 rdst->remote_ip = *src_ip;
995 f->updated = jiffies;
996 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
997 } else {
998 /* learned new entry */
999 spin_lock(&vxlan->hash_lock);
1000
1001 /* close off race between vxlan_flush and incoming packets */
1002 if (netif_running(dev))
1003 vxlan_fdb_create(vxlan, src_mac, src_ip,
1004 NUD_REACHABLE,
1005 NLM_F_EXCL|NLM_F_CREATE,
1006 vxlan->dst_port,
1007 vxlan->default_dst.remote_vni,
1008 0, NTF_SELF);
1009 spin_unlock(&vxlan->hash_lock);
1010 }
1011
1012 return false;
1013 }
1014
1015 /* See if multicast group is already in use by other ID */
1016 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1017 {
1018 struct vxlan_dev *vxlan;
1019
1020 /* The vxlan_sock is only used by dev, leaving group has
1021 * no effect on other vxlan devices.
1022 */
1023 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1024 return false;
1025
1026 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1027 if (!netif_running(vxlan->dev) || vxlan == dev)
1028 continue;
1029
1030 if (vxlan->vn_sock != dev->vn_sock)
1031 continue;
1032
1033 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1034 &dev->default_dst.remote_ip))
1035 continue;
1036
1037 if (vxlan->default_dst.remote_ifindex !=
1038 dev->default_dst.remote_ifindex)
1039 continue;
1040
1041 return true;
1042 }
1043
1044 return false;
1045 }
1046
1047 static void vxlan_sock_hold(struct vxlan_sock *vs)
1048 {
1049 atomic_inc(&vs->refcnt);
1050 }
1051
1052 void vxlan_sock_release(struct vxlan_sock *vs)
1053 {
1054 struct sock *sk = vs->sock->sk;
1055 struct net *net = sock_net(sk);
1056 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1057
1058 if (!atomic_dec_and_test(&vs->refcnt))
1059 return;
1060
1061 spin_lock(&vn->sock_lock);
1062 hlist_del_rcu(&vs->hlist);
1063 rcu_assign_sk_user_data(vs->sock->sk, NULL);
1064 vxlan_notify_del_rx_port(vs);
1065 spin_unlock(&vn->sock_lock);
1066
1067 queue_work(vxlan_wq, &vs->del_work);
1068 }
1069 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1070
1071 /* Callback to update multicast group membership when first VNI on
1072 * multicast asddress is brought up
1073 * Done as workqueue because ip_mc_join_group acquires RTNL.
1074 */
1075 static void vxlan_igmp_join(struct work_struct *work)
1076 {
1077 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1078 struct vxlan_sock *vs = vxlan->vn_sock;
1079 struct sock *sk = vs->sock->sk;
1080 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1081 int ifindex = vxlan->default_dst.remote_ifindex;
1082
1083 lock_sock(sk);
1084 if (ip->sa.sa_family == AF_INET) {
1085 struct ip_mreqn mreq = {
1086 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1087 .imr_ifindex = ifindex,
1088 };
1089
1090 ip_mc_join_group(sk, &mreq);
1091 #if IS_ENABLED(CONFIG_IPV6)
1092 } else {
1093 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1094 &ip->sin6.sin6_addr);
1095 #endif
1096 }
1097 release_sock(sk);
1098
1099 vxlan_sock_release(vs);
1100 dev_put(vxlan->dev);
1101 }
1102
1103 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1104 static void vxlan_igmp_leave(struct work_struct *work)
1105 {
1106 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1107 struct vxlan_sock *vs = vxlan->vn_sock;
1108 struct sock *sk = vs->sock->sk;
1109 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1110 int ifindex = vxlan->default_dst.remote_ifindex;
1111
1112 lock_sock(sk);
1113 if (ip->sa.sa_family == AF_INET) {
1114 struct ip_mreqn mreq = {
1115 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1116 .imr_ifindex = ifindex,
1117 };
1118
1119 ip_mc_leave_group(sk, &mreq);
1120 #if IS_ENABLED(CONFIG_IPV6)
1121 } else {
1122 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1123 &ip->sin6.sin6_addr);
1124 #endif
1125 }
1126
1127 release_sock(sk);
1128
1129 vxlan_sock_release(vs);
1130 dev_put(vxlan->dev);
1131 }
1132
1133 /* Callback from net/ipv4/udp.c to receive packets */
1134 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1135 {
1136 struct vxlan_sock *vs;
1137 struct vxlanhdr *vxh;
1138 __be16 port;
1139
1140 /* Need Vxlan and inner Ethernet header to be present */
1141 if (!pskb_may_pull(skb, VXLAN_HLEN))
1142 goto error;
1143
1144 /* Return packets with reserved bits set */
1145 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1146 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1147 (vxh->vx_vni & htonl(0xff))) {
1148 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1149 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1150 goto error;
1151 }
1152
1153 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1154 goto drop;
1155
1156 port = inet_sk(sk)->inet_sport;
1157
1158 vs = rcu_dereference_sk_user_data(sk);
1159 if (!vs)
1160 goto drop;
1161
1162 /* If the NIC driver gave us an encapsulated packet
1163 * with the encapsulation mark, the device checksummed it
1164 * for us. Otherwise force the upper layers to verify it.
1165 */
1166 if ((skb->ip_summed != CHECKSUM_UNNECESSARY && skb->ip_summed != CHECKSUM_PARTIAL) ||
1167 !skb->encapsulation)
1168 skb->ip_summed = CHECKSUM_NONE;
1169
1170 skb->encapsulation = 0;
1171
1172 vs->rcv(vs, skb, vxh->vx_vni);
1173 return 0;
1174
1175 drop:
1176 /* Consume bad packet */
1177 kfree_skb(skb);
1178 return 0;
1179
1180 error:
1181 /* Return non vxlan pkt */
1182 return 1;
1183 }
1184
1185 static void vxlan_rcv(struct vxlan_sock *vs,
1186 struct sk_buff *skb, __be32 vx_vni)
1187 {
1188 struct iphdr *oip = NULL;
1189 struct ipv6hdr *oip6 = NULL;
1190 struct vxlan_dev *vxlan;
1191 struct pcpu_sw_netstats *stats;
1192 union vxlan_addr saddr;
1193 __u32 vni;
1194 int err = 0;
1195 union vxlan_addr *remote_ip;
1196
1197 vni = ntohl(vx_vni) >> 8;
1198 /* Is this VNI defined? */
1199 vxlan = vxlan_vs_find_vni(vs, vni);
1200 if (!vxlan)
1201 goto drop;
1202
1203 remote_ip = &vxlan->default_dst.remote_ip;
1204 skb_reset_mac_header(skb);
1205 skb->protocol = eth_type_trans(skb, vxlan->dev);
1206
1207 /* Ignore packet loops (and multicast echo) */
1208 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1209 goto drop;
1210
1211 /* Re-examine inner Ethernet packet */
1212 if (remote_ip->sa.sa_family == AF_INET) {
1213 oip = ip_hdr(skb);
1214 saddr.sin.sin_addr.s_addr = oip->saddr;
1215 saddr.sa.sa_family = AF_INET;
1216 #if IS_ENABLED(CONFIG_IPV6)
1217 } else {
1218 oip6 = ipv6_hdr(skb);
1219 saddr.sin6.sin6_addr = oip6->saddr;
1220 saddr.sa.sa_family = AF_INET6;
1221 #endif
1222 }
1223
1224 if ((vxlan->flags & VXLAN_F_LEARN) &&
1225 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1226 goto drop;
1227
1228 skb_reset_network_header(skb);
1229
1230 if (oip6)
1231 err = IP6_ECN_decapsulate(oip6, skb);
1232 if (oip)
1233 err = IP_ECN_decapsulate(oip, skb);
1234
1235 if (unlikely(err)) {
1236 if (log_ecn_error) {
1237 if (oip6)
1238 net_info_ratelimited("non-ECT from %pI6\n",
1239 &oip6->saddr);
1240 if (oip)
1241 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1242 &oip->saddr, oip->tos);
1243 }
1244 if (err > 1) {
1245 ++vxlan->dev->stats.rx_frame_errors;
1246 ++vxlan->dev->stats.rx_errors;
1247 goto drop;
1248 }
1249 }
1250
1251 stats = this_cpu_ptr(vxlan->dev->tstats);
1252 u64_stats_update_begin(&stats->syncp);
1253 stats->rx_packets++;
1254 stats->rx_bytes += skb->len;
1255 u64_stats_update_end(&stats->syncp);
1256
1257 netif_rx(skb);
1258
1259 return;
1260 drop:
1261 /* Consume bad packet */
1262 kfree_skb(skb);
1263 }
1264
1265 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1266 {
1267 struct vxlan_dev *vxlan = netdev_priv(dev);
1268 struct arphdr *parp;
1269 u8 *arpptr, *sha;
1270 __be32 sip, tip;
1271 struct neighbour *n;
1272
1273 if (dev->flags & IFF_NOARP)
1274 goto out;
1275
1276 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1277 dev->stats.tx_dropped++;
1278 goto out;
1279 }
1280 parp = arp_hdr(skb);
1281
1282 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1283 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1284 parp->ar_pro != htons(ETH_P_IP) ||
1285 parp->ar_op != htons(ARPOP_REQUEST) ||
1286 parp->ar_hln != dev->addr_len ||
1287 parp->ar_pln != 4)
1288 goto out;
1289 arpptr = (u8 *)parp + sizeof(struct arphdr);
1290 sha = arpptr;
1291 arpptr += dev->addr_len; /* sha */
1292 memcpy(&sip, arpptr, sizeof(sip));
1293 arpptr += sizeof(sip);
1294 arpptr += dev->addr_len; /* tha */
1295 memcpy(&tip, arpptr, sizeof(tip));
1296
1297 if (ipv4_is_loopback(tip) ||
1298 ipv4_is_multicast(tip))
1299 goto out;
1300
1301 n = neigh_lookup(&arp_tbl, &tip, dev);
1302
1303 if (n) {
1304 struct vxlan_fdb *f;
1305 struct sk_buff *reply;
1306
1307 if (!(n->nud_state & NUD_CONNECTED)) {
1308 neigh_release(n);
1309 goto out;
1310 }
1311
1312 f = vxlan_find_mac(vxlan, n->ha);
1313 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1314 /* bridge-local neighbor */
1315 neigh_release(n);
1316 goto out;
1317 }
1318
1319 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1320 n->ha, sha);
1321
1322 neigh_release(n);
1323
1324 skb_reset_mac_header(reply);
1325 __skb_pull(reply, skb_network_offset(reply));
1326 reply->ip_summed = CHECKSUM_UNNECESSARY;
1327 reply->pkt_type = PACKET_HOST;
1328
1329 if (netif_rx_ni(reply) == NET_RX_DROP)
1330 dev->stats.rx_dropped++;
1331 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1332 union vxlan_addr ipa = {
1333 .sin.sin_addr.s_addr = tip,
1334 .sa.sa_family = AF_INET,
1335 };
1336
1337 vxlan_ip_miss(dev, &ipa);
1338 }
1339 out:
1340 consume_skb(skb);
1341 return NETDEV_TX_OK;
1342 }
1343
1344 #if IS_ENABLED(CONFIG_IPV6)
1345 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1346 {
1347 struct vxlan_dev *vxlan = netdev_priv(dev);
1348 struct neighbour *n;
1349 union vxlan_addr ipa;
1350 const struct ipv6hdr *iphdr;
1351 const struct in6_addr *saddr, *daddr;
1352 struct nd_msg *msg;
1353 struct inet6_dev *in6_dev = NULL;
1354
1355 in6_dev = __in6_dev_get(dev);
1356 if (!in6_dev)
1357 goto out;
1358
1359 if (!pskb_may_pull(skb, skb->len))
1360 goto out;
1361
1362 iphdr = ipv6_hdr(skb);
1363 saddr = &iphdr->saddr;
1364 daddr = &iphdr->daddr;
1365
1366 if (ipv6_addr_loopback(daddr) ||
1367 ipv6_addr_is_multicast(daddr))
1368 goto out;
1369
1370 msg = (struct nd_msg *)skb_transport_header(skb);
1371 if (msg->icmph.icmp6_code != 0 ||
1372 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1373 goto out;
1374
1375 n = neigh_lookup(ipv6_stub->nd_tbl, daddr, dev);
1376
1377 if (n) {
1378 struct vxlan_fdb *f;
1379
1380 if (!(n->nud_state & NUD_CONNECTED)) {
1381 neigh_release(n);
1382 goto out;
1383 }
1384
1385 f = vxlan_find_mac(vxlan, n->ha);
1386 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1387 /* bridge-local neighbor */
1388 neigh_release(n);
1389 goto out;
1390 }
1391
1392 ipv6_stub->ndisc_send_na(dev, n, saddr, &msg->target,
1393 !!in6_dev->cnf.forwarding,
1394 true, false, false);
1395 neigh_release(n);
1396 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1397 ipa.sin6.sin6_addr = *daddr;
1398 ipa.sa.sa_family = AF_INET6;
1399 vxlan_ip_miss(dev, &ipa);
1400 }
1401
1402 out:
1403 consume_skb(skb);
1404 return NETDEV_TX_OK;
1405 }
1406 #endif
1407
1408 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1409 {
1410 struct vxlan_dev *vxlan = netdev_priv(dev);
1411 struct neighbour *n;
1412
1413 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1414 return false;
1415
1416 n = NULL;
1417 switch (ntohs(eth_hdr(skb)->h_proto)) {
1418 case ETH_P_IP:
1419 {
1420 struct iphdr *pip;
1421
1422 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1423 return false;
1424 pip = ip_hdr(skb);
1425 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1426 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1427 union vxlan_addr ipa = {
1428 .sin.sin_addr.s_addr = pip->daddr,
1429 .sa.sa_family = AF_INET,
1430 };
1431
1432 vxlan_ip_miss(dev, &ipa);
1433 return false;
1434 }
1435
1436 break;
1437 }
1438 #if IS_ENABLED(CONFIG_IPV6)
1439 case ETH_P_IPV6:
1440 {
1441 struct ipv6hdr *pip6;
1442
1443 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1444 return false;
1445 pip6 = ipv6_hdr(skb);
1446 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1447 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1448 union vxlan_addr ipa = {
1449 .sin6.sin6_addr = pip6->daddr,
1450 .sa.sa_family = AF_INET6,
1451 };
1452
1453 vxlan_ip_miss(dev, &ipa);
1454 return false;
1455 }
1456
1457 break;
1458 }
1459 #endif
1460 default:
1461 return false;
1462 }
1463
1464 if (n) {
1465 bool diff;
1466
1467 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1468 if (diff) {
1469 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1470 dev->addr_len);
1471 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1472 }
1473 neigh_release(n);
1474 return diff;
1475 }
1476
1477 return false;
1478 }
1479
1480 /* Compute source port for outgoing packet
1481 * first choice to use L4 flow hash since it will spread
1482 * better and maybe available from hardware
1483 * secondary choice is to use jhash on the Ethernet header
1484 */
1485 __be16 vxlan_src_port(__u16 port_min, __u16 port_max, struct sk_buff *skb)
1486 {
1487 unsigned int range = (port_max - port_min) + 1;
1488 u32 hash;
1489
1490 hash = skb_get_hash(skb);
1491 if (!hash)
1492 hash = jhash(skb->data, 2 * ETH_ALEN,
1493 (__force u32) skb->protocol);
1494
1495 return htons((((u64) hash * range) >> 32) + port_min);
1496 }
1497 EXPORT_SYMBOL_GPL(vxlan_src_port);
1498
1499 static int handle_offloads(struct sk_buff *skb)
1500 {
1501 if (skb_is_gso(skb)) {
1502 int err = skb_unclone(skb, GFP_ATOMIC);
1503 if (unlikely(err))
1504 return err;
1505
1506 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
1507 } else if (skb->ip_summed != CHECKSUM_PARTIAL)
1508 skb->ip_summed = CHECKSUM_NONE;
1509
1510 return 0;
1511 }
1512
1513 #if IS_ENABLED(CONFIG_IPV6)
1514 static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1515 struct dst_entry *dst, struct sk_buff *skb,
1516 struct net_device *dev, struct in6_addr *saddr,
1517 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1518 __be16 src_port, __be16 dst_port, __be32 vni)
1519 {
1520 struct ipv6hdr *ip6h;
1521 struct vxlanhdr *vxh;
1522 struct udphdr *uh;
1523 int min_headroom;
1524 int err;
1525
1526 if (!skb->encapsulation) {
1527 skb_reset_inner_headers(skb);
1528 skb->encapsulation = 1;
1529 }
1530
1531 skb_scrub_packet(skb, false);
1532
1533 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1534 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1535 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1536
1537 /* Need space for new headers (invalidates iph ptr) */
1538 err = skb_cow_head(skb, min_headroom);
1539 if (unlikely(err))
1540 return err;
1541
1542 if (vlan_tx_tag_present(skb)) {
1543 if (WARN_ON(!__vlan_put_tag(skb,
1544 skb->vlan_proto,
1545 vlan_tx_tag_get(skb))))
1546 return -ENOMEM;
1547
1548 skb->vlan_tci = 0;
1549 }
1550
1551 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1552 vxh->vx_flags = htonl(VXLAN_FLAGS);
1553 vxh->vx_vni = vni;
1554
1555 __skb_push(skb, sizeof(*uh));
1556 skb_reset_transport_header(skb);
1557 uh = udp_hdr(skb);
1558
1559 uh->dest = dst_port;
1560 uh->source = src_port;
1561
1562 uh->len = htons(skb->len);
1563 uh->check = 0;
1564
1565 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1566 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
1567 IPSKB_REROUTED);
1568 skb_dst_set(skb, dst);
1569
1570 if (!skb_is_gso(skb) && !(dst->dev->features & NETIF_F_IPV6_CSUM)) {
1571 __wsum csum = skb_checksum(skb, 0, skb->len, 0);
1572 skb->ip_summed = CHECKSUM_UNNECESSARY;
1573 uh->check = csum_ipv6_magic(saddr, daddr, skb->len,
1574 IPPROTO_UDP, csum);
1575 if (uh->check == 0)
1576 uh->check = CSUM_MANGLED_0;
1577 } else {
1578 skb->ip_summed = CHECKSUM_PARTIAL;
1579 skb->csum_start = skb_transport_header(skb) - skb->head;
1580 skb->csum_offset = offsetof(struct udphdr, check);
1581 uh->check = ~csum_ipv6_magic(saddr, daddr,
1582 skb->len, IPPROTO_UDP, 0);
1583 }
1584
1585 __skb_push(skb, sizeof(*ip6h));
1586 skb_reset_network_header(skb);
1587 ip6h = ipv6_hdr(skb);
1588 ip6h->version = 6;
1589 ip6h->priority = prio;
1590 ip6h->flow_lbl[0] = 0;
1591 ip6h->flow_lbl[1] = 0;
1592 ip6h->flow_lbl[2] = 0;
1593 ip6h->payload_len = htons(skb->len);
1594 ip6h->nexthdr = IPPROTO_UDP;
1595 ip6h->hop_limit = ttl;
1596 ip6h->daddr = *daddr;
1597 ip6h->saddr = *saddr;
1598
1599 err = handle_offloads(skb);
1600 if (err)
1601 return err;
1602
1603 ip6tunnel_xmit(skb, dev);
1604 return 0;
1605 }
1606 #endif
1607
1608 int vxlan_xmit_skb(struct vxlan_sock *vs,
1609 struct rtable *rt, struct sk_buff *skb,
1610 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1611 __be16 src_port, __be16 dst_port, __be32 vni)
1612 {
1613 struct vxlanhdr *vxh;
1614 struct udphdr *uh;
1615 int min_headroom;
1616 int err;
1617
1618 if (!skb->encapsulation) {
1619 skb_reset_inner_headers(skb);
1620 skb->encapsulation = 1;
1621 }
1622
1623 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1624 + VXLAN_HLEN + sizeof(struct iphdr)
1625 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1626
1627 /* Need space for new headers (invalidates iph ptr) */
1628 err = skb_cow_head(skb, min_headroom);
1629 if (unlikely(err))
1630 return err;
1631
1632 if (vlan_tx_tag_present(skb)) {
1633 if (WARN_ON(!__vlan_put_tag(skb,
1634 skb->vlan_proto,
1635 vlan_tx_tag_get(skb))))
1636 return -ENOMEM;
1637
1638 skb->vlan_tci = 0;
1639 }
1640
1641 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1642 vxh->vx_flags = htonl(VXLAN_FLAGS);
1643 vxh->vx_vni = vni;
1644
1645 __skb_push(skb, sizeof(*uh));
1646 skb_reset_transport_header(skb);
1647 uh = udp_hdr(skb);
1648
1649 uh->dest = dst_port;
1650 uh->source = src_port;
1651
1652 uh->len = htons(skb->len);
1653 uh->check = 0;
1654
1655 err = handle_offloads(skb);
1656 if (err)
1657 return err;
1658
1659 return iptunnel_xmit(rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df,
1660 false);
1661 }
1662 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1663
1664 /* Bypass encapsulation if the destination is local */
1665 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1666 struct vxlan_dev *dst_vxlan)
1667 {
1668 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1669 union vxlan_addr loopback;
1670 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1671
1672 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1673 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1674 skb->pkt_type = PACKET_HOST;
1675 skb->encapsulation = 0;
1676 skb->dev = dst_vxlan->dev;
1677 __skb_pull(skb, skb_network_offset(skb));
1678
1679 if (remote_ip->sa.sa_family == AF_INET) {
1680 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1681 loopback.sa.sa_family = AF_INET;
1682 #if IS_ENABLED(CONFIG_IPV6)
1683 } else {
1684 loopback.sin6.sin6_addr = in6addr_loopback;
1685 loopback.sa.sa_family = AF_INET6;
1686 #endif
1687 }
1688
1689 if (dst_vxlan->flags & VXLAN_F_LEARN)
1690 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1691
1692 u64_stats_update_begin(&tx_stats->syncp);
1693 tx_stats->tx_packets++;
1694 tx_stats->tx_bytes += skb->len;
1695 u64_stats_update_end(&tx_stats->syncp);
1696
1697 if (netif_rx(skb) == NET_RX_SUCCESS) {
1698 u64_stats_update_begin(&rx_stats->syncp);
1699 rx_stats->rx_packets++;
1700 rx_stats->rx_bytes += skb->len;
1701 u64_stats_update_end(&rx_stats->syncp);
1702 } else {
1703 skb->dev->stats.rx_dropped++;
1704 }
1705 }
1706
1707 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1708 struct vxlan_rdst *rdst, bool did_rsc)
1709 {
1710 struct vxlan_dev *vxlan = netdev_priv(dev);
1711 struct rtable *rt = NULL;
1712 const struct iphdr *old_iph;
1713 struct flowi4 fl4;
1714 union vxlan_addr *dst;
1715 __be16 src_port = 0, dst_port;
1716 u32 vni;
1717 __be16 df = 0;
1718 __u8 tos, ttl;
1719 int err;
1720
1721 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1722 vni = rdst->remote_vni;
1723 dst = &rdst->remote_ip;
1724
1725 if (vxlan_addr_any(dst)) {
1726 if (did_rsc) {
1727 /* short-circuited back to local bridge */
1728 vxlan_encap_bypass(skb, vxlan, vxlan);
1729 return;
1730 }
1731 goto drop;
1732 }
1733
1734 old_iph = ip_hdr(skb);
1735
1736 ttl = vxlan->ttl;
1737 if (!ttl && vxlan_addr_multicast(dst))
1738 ttl = 1;
1739
1740 tos = vxlan->tos;
1741 if (tos == 1)
1742 tos = ip_tunnel_get_dsfield(old_iph, skb);
1743
1744 src_port = vxlan_src_port(vxlan->port_min, vxlan->port_max, skb);
1745
1746 if (dst->sa.sa_family == AF_INET) {
1747 memset(&fl4, 0, sizeof(fl4));
1748 fl4.flowi4_oif = rdst->remote_ifindex;
1749 fl4.flowi4_tos = RT_TOS(tos);
1750 fl4.daddr = dst->sin.sin_addr.s_addr;
1751 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1752
1753 rt = ip_route_output_key(dev_net(dev), &fl4);
1754 if (IS_ERR(rt)) {
1755 netdev_dbg(dev, "no route to %pI4\n",
1756 &dst->sin.sin_addr.s_addr);
1757 dev->stats.tx_carrier_errors++;
1758 goto tx_error;
1759 }
1760
1761 if (rt->dst.dev == dev) {
1762 netdev_dbg(dev, "circular route to %pI4\n",
1763 &dst->sin.sin_addr.s_addr);
1764 dev->stats.collisions++;
1765 goto rt_tx_error;
1766 }
1767
1768 /* Bypass encapsulation if the destination is local */
1769 if (rt->rt_flags & RTCF_LOCAL &&
1770 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1771 struct vxlan_dev *dst_vxlan;
1772
1773 ip_rt_put(rt);
1774 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1775 if (!dst_vxlan)
1776 goto tx_error;
1777 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1778 return;
1779 }
1780
1781 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1782 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1783
1784 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1785 fl4.saddr, dst->sin.sin_addr.s_addr,
1786 tos, ttl, df, src_port, dst_port,
1787 htonl(vni << 8));
1788
1789 if (err < 0)
1790 goto rt_tx_error;
1791 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1792 #if IS_ENABLED(CONFIG_IPV6)
1793 } else {
1794 struct sock *sk = vxlan->vn_sock->sock->sk;
1795 struct dst_entry *ndst;
1796 struct flowi6 fl6;
1797 u32 flags;
1798
1799 memset(&fl6, 0, sizeof(fl6));
1800 fl6.flowi6_oif = rdst->remote_ifindex;
1801 fl6.daddr = dst->sin6.sin6_addr;
1802 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1803 fl6.flowi6_proto = IPPROTO_UDP;
1804
1805 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1806 netdev_dbg(dev, "no route to %pI6\n",
1807 &dst->sin6.sin6_addr);
1808 dev->stats.tx_carrier_errors++;
1809 goto tx_error;
1810 }
1811
1812 if (ndst->dev == dev) {
1813 netdev_dbg(dev, "circular route to %pI6\n",
1814 &dst->sin6.sin6_addr);
1815 dst_release(ndst);
1816 dev->stats.collisions++;
1817 goto tx_error;
1818 }
1819
1820 /* Bypass encapsulation if the destination is local */
1821 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1822 if (flags & RTF_LOCAL &&
1823 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1824 struct vxlan_dev *dst_vxlan;
1825
1826 dst_release(ndst);
1827 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1828 if (!dst_vxlan)
1829 goto tx_error;
1830 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1831 return;
1832 }
1833
1834 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1835
1836 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
1837 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1838 src_port, dst_port, htonl(vni << 8));
1839 #endif
1840 }
1841
1842 return;
1843
1844 drop:
1845 dev->stats.tx_dropped++;
1846 goto tx_free;
1847
1848 rt_tx_error:
1849 ip_rt_put(rt);
1850 tx_error:
1851 dev->stats.tx_errors++;
1852 tx_free:
1853 dev_kfree_skb(skb);
1854 }
1855
1856 /* Transmit local packets over Vxlan
1857 *
1858 * Outer IP header inherits ECN and DF from inner header.
1859 * Outer UDP destination is the VXLAN assigned port.
1860 * source port is based on hash of flow
1861 */
1862 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1863 {
1864 struct vxlan_dev *vxlan = netdev_priv(dev);
1865 struct ethhdr *eth;
1866 bool did_rsc = false;
1867 struct vxlan_rdst *rdst, *fdst = NULL;
1868 struct vxlan_fdb *f;
1869
1870 skb_reset_mac_header(skb);
1871 eth = eth_hdr(skb);
1872
1873 if ((vxlan->flags & VXLAN_F_PROXY)) {
1874 if (ntohs(eth->h_proto) == ETH_P_ARP)
1875 return arp_reduce(dev, skb);
1876 #if IS_ENABLED(CONFIG_IPV6)
1877 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1878 skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
1879 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1880 struct nd_msg *msg;
1881
1882 msg = (struct nd_msg *)skb_transport_header(skb);
1883 if (msg->icmph.icmp6_code == 0 &&
1884 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1885 return neigh_reduce(dev, skb);
1886 }
1887 #endif
1888 }
1889
1890 f = vxlan_find_mac(vxlan, eth->h_dest);
1891 did_rsc = false;
1892
1893 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1894 (ntohs(eth->h_proto) == ETH_P_IP ||
1895 ntohs(eth->h_proto) == ETH_P_IPV6)) {
1896 did_rsc = route_shortcircuit(dev, skb);
1897 if (did_rsc)
1898 f = vxlan_find_mac(vxlan, eth->h_dest);
1899 }
1900
1901 if (f == NULL) {
1902 f = vxlan_find_mac(vxlan, all_zeros_mac);
1903 if (f == NULL) {
1904 if ((vxlan->flags & VXLAN_F_L2MISS) &&
1905 !is_multicast_ether_addr(eth->h_dest))
1906 vxlan_fdb_miss(vxlan, eth->h_dest);
1907
1908 dev->stats.tx_dropped++;
1909 kfree_skb(skb);
1910 return NETDEV_TX_OK;
1911 }
1912 }
1913
1914 list_for_each_entry_rcu(rdst, &f->remotes, list) {
1915 struct sk_buff *skb1;
1916
1917 if (!fdst) {
1918 fdst = rdst;
1919 continue;
1920 }
1921 skb1 = skb_clone(skb, GFP_ATOMIC);
1922 if (skb1)
1923 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1924 }
1925
1926 if (fdst)
1927 vxlan_xmit_one(skb, dev, fdst, did_rsc);
1928 else
1929 kfree_skb(skb);
1930 return NETDEV_TX_OK;
1931 }
1932
1933 /* Walk the forwarding table and purge stale entries */
1934 static void vxlan_cleanup(unsigned long arg)
1935 {
1936 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1937 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1938 unsigned int h;
1939
1940 if (!netif_running(vxlan->dev))
1941 return;
1942
1943 spin_lock_bh(&vxlan->hash_lock);
1944 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1945 struct hlist_node *p, *n;
1946 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1947 struct vxlan_fdb *f
1948 = container_of(p, struct vxlan_fdb, hlist);
1949 unsigned long timeout;
1950
1951 if (f->state & NUD_PERMANENT)
1952 continue;
1953
1954 timeout = f->used + vxlan->age_interval * HZ;
1955 if (time_before_eq(timeout, jiffies)) {
1956 netdev_dbg(vxlan->dev,
1957 "garbage collect %pM\n",
1958 f->eth_addr);
1959 f->state = NUD_STALE;
1960 vxlan_fdb_destroy(vxlan, f);
1961 } else if (time_before(timeout, next_timer))
1962 next_timer = timeout;
1963 }
1964 }
1965 spin_unlock_bh(&vxlan->hash_lock);
1966
1967 mod_timer(&vxlan->age_timer, next_timer);
1968 }
1969
1970 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
1971 {
1972 __u32 vni = vxlan->default_dst.remote_vni;
1973
1974 vxlan->vn_sock = vs;
1975 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1976 }
1977
1978 /* Setup stats when device is created */
1979 static int vxlan_init(struct net_device *dev)
1980 {
1981 struct vxlan_dev *vxlan = netdev_priv(dev);
1982 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1983 struct vxlan_sock *vs;
1984 int i;
1985
1986 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
1987 if (!dev->tstats)
1988 return -ENOMEM;
1989
1990 for_each_possible_cpu(i) {
1991 struct pcpu_sw_netstats *vxlan_stats;
1992 vxlan_stats = per_cpu_ptr(dev->tstats, i);
1993 u64_stats_init(&vxlan_stats->syncp);
1994 }
1995
1996
1997 spin_lock(&vn->sock_lock);
1998 vs = vxlan_find_sock(dev_net(dev), vxlan->dst_port);
1999 if (vs) {
2000 /* If we have a socket with same port already, reuse it */
2001 atomic_inc(&vs->refcnt);
2002 vxlan_vs_add_dev(vs, vxlan);
2003 } else {
2004 /* otherwise make new socket outside of RTNL */
2005 dev_hold(dev);
2006 queue_work(vxlan_wq, &vxlan->sock_work);
2007 }
2008 spin_unlock(&vn->sock_lock);
2009
2010 return 0;
2011 }
2012
2013 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2014 {
2015 struct vxlan_fdb *f;
2016
2017 spin_lock_bh(&vxlan->hash_lock);
2018 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2019 if (f)
2020 vxlan_fdb_destroy(vxlan, f);
2021 spin_unlock_bh(&vxlan->hash_lock);
2022 }
2023
2024 static void vxlan_uninit(struct net_device *dev)
2025 {
2026 struct vxlan_dev *vxlan = netdev_priv(dev);
2027 struct vxlan_sock *vs = vxlan->vn_sock;
2028
2029 vxlan_fdb_delete_default(vxlan);
2030
2031 if (vs)
2032 vxlan_sock_release(vs);
2033 free_percpu(dev->tstats);
2034 }
2035
2036 /* Start ageing timer and join group when device is brought up */
2037 static int vxlan_open(struct net_device *dev)
2038 {
2039 struct vxlan_dev *vxlan = netdev_priv(dev);
2040 struct vxlan_sock *vs = vxlan->vn_sock;
2041
2042 /* socket hasn't been created */
2043 if (!vs)
2044 return -ENOTCONN;
2045
2046 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2047 vxlan_sock_hold(vs);
2048 dev_hold(dev);
2049 queue_work(vxlan_wq, &vxlan->igmp_join);
2050 }
2051
2052 if (vxlan->age_interval)
2053 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2054
2055 return 0;
2056 }
2057
2058 /* Purge the forwarding table */
2059 static void vxlan_flush(struct vxlan_dev *vxlan)
2060 {
2061 unsigned int h;
2062
2063 spin_lock_bh(&vxlan->hash_lock);
2064 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2065 struct hlist_node *p, *n;
2066 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2067 struct vxlan_fdb *f
2068 = container_of(p, struct vxlan_fdb, hlist);
2069 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2070 if (!is_zero_ether_addr(f->eth_addr))
2071 vxlan_fdb_destroy(vxlan, f);
2072 }
2073 }
2074 spin_unlock_bh(&vxlan->hash_lock);
2075 }
2076
2077 /* Cleanup timer and forwarding table on shutdown */
2078 static int vxlan_stop(struct net_device *dev)
2079 {
2080 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2081 struct vxlan_dev *vxlan = netdev_priv(dev);
2082 struct vxlan_sock *vs = vxlan->vn_sock;
2083
2084 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2085 !vxlan_group_used(vn, vxlan)) {
2086 vxlan_sock_hold(vs);
2087 dev_hold(dev);
2088 queue_work(vxlan_wq, &vxlan->igmp_leave);
2089 }
2090
2091 del_timer_sync(&vxlan->age_timer);
2092
2093 vxlan_flush(vxlan);
2094
2095 return 0;
2096 }
2097
2098 /* Stub, nothing needs to be done. */
2099 static void vxlan_set_multicast_list(struct net_device *dev)
2100 {
2101 }
2102
2103 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2104 {
2105 struct vxlan_dev *vxlan = netdev_priv(dev);
2106 struct vxlan_rdst *dst = &vxlan->default_dst;
2107 struct net_device *lowerdev;
2108 int max_mtu;
2109
2110 lowerdev = __dev_get_by_index(dev_net(dev), dst->remote_ifindex);
2111 if (lowerdev == NULL)
2112 return eth_change_mtu(dev, new_mtu);
2113
2114 if (dst->remote_ip.sa.sa_family == AF_INET6)
2115 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2116 else
2117 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2118
2119 if (new_mtu < 68 || new_mtu > max_mtu)
2120 return -EINVAL;
2121
2122 dev->mtu = new_mtu;
2123 return 0;
2124 }
2125
2126 static const struct net_device_ops vxlan_netdev_ops = {
2127 .ndo_init = vxlan_init,
2128 .ndo_uninit = vxlan_uninit,
2129 .ndo_open = vxlan_open,
2130 .ndo_stop = vxlan_stop,
2131 .ndo_start_xmit = vxlan_xmit,
2132 .ndo_get_stats64 = ip_tunnel_get_stats64,
2133 .ndo_set_rx_mode = vxlan_set_multicast_list,
2134 .ndo_change_mtu = vxlan_change_mtu,
2135 .ndo_validate_addr = eth_validate_addr,
2136 .ndo_set_mac_address = eth_mac_addr,
2137 .ndo_fdb_add = vxlan_fdb_add,
2138 .ndo_fdb_del = vxlan_fdb_delete,
2139 .ndo_fdb_dump = vxlan_fdb_dump,
2140 };
2141
2142 /* Info for udev, that this is a virtual tunnel endpoint */
2143 static struct device_type vxlan_type = {
2144 .name = "vxlan",
2145 };
2146
2147 /* Calls the ndo_add_vxlan_port of the caller in order to
2148 * supply the listening VXLAN udp ports. Callers are expected
2149 * to implement the ndo_add_vxlan_port.
2150 */
2151 void vxlan_get_rx_port(struct net_device *dev)
2152 {
2153 struct vxlan_sock *vs;
2154 struct net *net = dev_net(dev);
2155 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2156 sa_family_t sa_family;
2157 __be16 port;
2158 unsigned int i;
2159
2160 spin_lock(&vn->sock_lock);
2161 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2162 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2163 port = inet_sk(vs->sock->sk)->inet_sport;
2164 sa_family = vs->sock->sk->sk_family;
2165 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2166 port);
2167 }
2168 }
2169 spin_unlock(&vn->sock_lock);
2170 }
2171 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2172
2173 /* Initialize the device structure. */
2174 static void vxlan_setup(struct net_device *dev)
2175 {
2176 struct vxlan_dev *vxlan = netdev_priv(dev);
2177 unsigned int h;
2178 int low, high;
2179
2180 eth_hw_addr_random(dev);
2181 ether_setup(dev);
2182 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2183 dev->hard_header_len = ETH_HLEN + VXLAN6_HEADROOM;
2184 else
2185 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
2186
2187 dev->netdev_ops = &vxlan_netdev_ops;
2188 dev->destructor = free_netdev;
2189 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2190
2191 dev->tx_queue_len = 0;
2192 dev->features |= NETIF_F_LLTX;
2193 dev->features |= NETIF_F_NETNS_LOCAL;
2194 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2195 dev->features |= NETIF_F_RXCSUM;
2196 dev->features |= NETIF_F_GSO_SOFTWARE;
2197
2198 dev->vlan_features = dev->features;
2199 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2200 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2201 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2202 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2203 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
2204 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2205
2206 INIT_LIST_HEAD(&vxlan->next);
2207 spin_lock_init(&vxlan->hash_lock);
2208 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2209 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2210 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2211
2212 init_timer_deferrable(&vxlan->age_timer);
2213 vxlan->age_timer.function = vxlan_cleanup;
2214 vxlan->age_timer.data = (unsigned long) vxlan;
2215
2216 inet_get_local_port_range(dev_net(dev), &low, &high);
2217 vxlan->port_min = low;
2218 vxlan->port_max = high;
2219 vxlan->dst_port = htons(vxlan_port);
2220
2221 vxlan->dev = dev;
2222
2223 for (h = 0; h < FDB_HASH_SIZE; ++h)
2224 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2225 }
2226
2227 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2228 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2229 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2230 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2231 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2232 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2233 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2234 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2235 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2236 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2237 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2238 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2239 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2240 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2241 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2242 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2243 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2244 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2245 };
2246
2247 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2248 {
2249 if (tb[IFLA_ADDRESS]) {
2250 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2251 pr_debug("invalid link address (not ethernet)\n");
2252 return -EINVAL;
2253 }
2254
2255 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2256 pr_debug("invalid all zero ethernet address\n");
2257 return -EADDRNOTAVAIL;
2258 }
2259 }
2260
2261 if (!data)
2262 return -EINVAL;
2263
2264 if (data[IFLA_VXLAN_ID]) {
2265 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2266 if (id >= VXLAN_VID_MASK)
2267 return -ERANGE;
2268 }
2269
2270 if (data[IFLA_VXLAN_PORT_RANGE]) {
2271 const struct ifla_vxlan_port_range *p
2272 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2273
2274 if (ntohs(p->high) < ntohs(p->low)) {
2275 pr_debug("port range %u .. %u not valid\n",
2276 ntohs(p->low), ntohs(p->high));
2277 return -EINVAL;
2278 }
2279 }
2280
2281 return 0;
2282 }
2283
2284 static void vxlan_get_drvinfo(struct net_device *netdev,
2285 struct ethtool_drvinfo *drvinfo)
2286 {
2287 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2288 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2289 }
2290
2291 static const struct ethtool_ops vxlan_ethtool_ops = {
2292 .get_drvinfo = vxlan_get_drvinfo,
2293 .get_link = ethtool_op_get_link,
2294 };
2295
2296 static void vxlan_del_work(struct work_struct *work)
2297 {
2298 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2299
2300 sk_release_kernel(vs->sock->sk);
2301 kfree_rcu(vs, rcu);
2302 }
2303
2304 #if IS_ENABLED(CONFIG_IPV6)
2305 /* Create UDP socket for encapsulation receive. AF_INET6 socket
2306 * could be used for both IPv4 and IPv6 communications, but
2307 * users may set bindv6only=1.
2308 */
2309 static struct socket *create_v6_sock(struct net *net, __be16 port)
2310 {
2311 struct sock *sk;
2312 struct socket *sock;
2313 struct sockaddr_in6 vxlan_addr = {
2314 .sin6_family = AF_INET6,
2315 .sin6_port = port,
2316 };
2317 int rc, val = 1;
2318
2319 rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
2320 if (rc < 0) {
2321 pr_debug("UDPv6 socket create failed\n");
2322 return ERR_PTR(rc);
2323 }
2324
2325 /* Put in proper namespace */
2326 sk = sock->sk;
2327 sk_change_net(sk, net);
2328
2329 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
2330 (char *)&val, sizeof(val));
2331 rc = kernel_bind(sock, (struct sockaddr *)&vxlan_addr,
2332 sizeof(struct sockaddr_in6));
2333 if (rc < 0) {
2334 pr_debug("bind for UDPv6 socket %pI6:%u (%d)\n",
2335 &vxlan_addr.sin6_addr, ntohs(vxlan_addr.sin6_port), rc);
2336 sk_release_kernel(sk);
2337 return ERR_PTR(rc);
2338 }
2339 /* At this point, IPv6 module should have been loaded in
2340 * sock_create_kern().
2341 */
2342 BUG_ON(!ipv6_stub);
2343
2344 /* Disable multicast loopback */
2345 inet_sk(sk)->mc_loop = 0;
2346 return sock;
2347 }
2348
2349 #else
2350
2351 static struct socket *create_v6_sock(struct net *net, __be16 port)
2352 {
2353 return ERR_PTR(-EPFNOSUPPORT);
2354 }
2355 #endif
2356
2357 static struct socket *create_v4_sock(struct net *net, __be16 port)
2358 {
2359 struct sock *sk;
2360 struct socket *sock;
2361 struct sockaddr_in vxlan_addr = {
2362 .sin_family = AF_INET,
2363 .sin_addr.s_addr = htonl(INADDR_ANY),
2364 .sin_port = port,
2365 };
2366 int rc;
2367
2368 /* Create UDP socket for encapsulation receive. */
2369 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
2370 if (rc < 0) {
2371 pr_debug("UDP socket create failed\n");
2372 return ERR_PTR(rc);
2373 }
2374
2375 /* Put in proper namespace */
2376 sk = sock->sk;
2377 sk_change_net(sk, net);
2378
2379 rc = kernel_bind(sock, (struct sockaddr *) &vxlan_addr,
2380 sizeof(vxlan_addr));
2381 if (rc < 0) {
2382 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
2383 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
2384 sk_release_kernel(sk);
2385 return ERR_PTR(rc);
2386 }
2387
2388 /* Disable multicast loopback */
2389 inet_sk(sk)->mc_loop = 0;
2390 return sock;
2391 }
2392
2393 /* Create new listen socket if needed */
2394 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2395 vxlan_rcv_t *rcv, void *data, bool ipv6)
2396 {
2397 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2398 struct vxlan_sock *vs;
2399 struct socket *sock;
2400 struct sock *sk;
2401 unsigned int h;
2402
2403 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2404 if (!vs)
2405 return ERR_PTR(-ENOMEM);
2406
2407 for (h = 0; h < VNI_HASH_SIZE; ++h)
2408 INIT_HLIST_HEAD(&vs->vni_list[h]);
2409
2410 INIT_WORK(&vs->del_work, vxlan_del_work);
2411
2412 if (ipv6)
2413 sock = create_v6_sock(net, port);
2414 else
2415 sock = create_v4_sock(net, port);
2416 if (IS_ERR(sock)) {
2417 kfree(vs);
2418 return ERR_CAST(sock);
2419 }
2420
2421 vs->sock = sock;
2422 sk = sock->sk;
2423 atomic_set(&vs->refcnt, 1);
2424 vs->rcv = rcv;
2425 vs->data = data;
2426 rcu_assign_sk_user_data(vs->sock->sk, vs);
2427
2428 /* Initialize the vxlan udp offloads structure */
2429 vs->udp_offloads.port = port;
2430 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2431 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2432
2433 spin_lock(&vn->sock_lock);
2434 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2435 vxlan_notify_add_rx_port(vs);
2436 spin_unlock(&vn->sock_lock);
2437
2438 /* Mark socket as an encapsulation socket. */
2439 udp_sk(sk)->encap_type = 1;
2440 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
2441 #if IS_ENABLED(CONFIG_IPV6)
2442 if (ipv6)
2443 ipv6_stub->udpv6_encap_enable();
2444 else
2445 #endif
2446 udp_encap_enable();
2447
2448 return vs;
2449 }
2450
2451 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2452 vxlan_rcv_t *rcv, void *data,
2453 bool no_share, bool ipv6)
2454 {
2455 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2456 struct vxlan_sock *vs;
2457
2458 vs = vxlan_socket_create(net, port, rcv, data, ipv6);
2459 if (!IS_ERR(vs))
2460 return vs;
2461
2462 if (no_share) /* Return error if sharing is not allowed. */
2463 return vs;
2464
2465 spin_lock(&vn->sock_lock);
2466 vs = vxlan_find_sock(net, port);
2467 if (vs) {
2468 if (vs->rcv == rcv)
2469 atomic_inc(&vs->refcnt);
2470 else
2471 vs = ERR_PTR(-EBUSY);
2472 }
2473 spin_unlock(&vn->sock_lock);
2474
2475 if (!vs)
2476 vs = ERR_PTR(-EINVAL);
2477
2478 return vs;
2479 }
2480 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2481
2482 /* Scheduled at device creation to bind to a socket */
2483 static void vxlan_sock_work(struct work_struct *work)
2484 {
2485 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2486 struct net *net = dev_net(vxlan->dev);
2487 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2488 __be16 port = vxlan->dst_port;
2489 struct vxlan_sock *nvs;
2490
2491 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags & VXLAN_F_IPV6);
2492 spin_lock(&vn->sock_lock);
2493 if (!IS_ERR(nvs))
2494 vxlan_vs_add_dev(nvs, vxlan);
2495 spin_unlock(&vn->sock_lock);
2496
2497 dev_put(vxlan->dev);
2498 }
2499
2500 static int vxlan_newlink(struct net *net, struct net_device *dev,
2501 struct nlattr *tb[], struct nlattr *data[])
2502 {
2503 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2504 struct vxlan_dev *vxlan = netdev_priv(dev);
2505 struct vxlan_rdst *dst = &vxlan->default_dst;
2506 __u32 vni;
2507 int err;
2508 bool use_ipv6 = false;
2509
2510 if (!data[IFLA_VXLAN_ID])
2511 return -EINVAL;
2512
2513 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2514 dst->remote_vni = vni;
2515
2516 if (data[IFLA_VXLAN_GROUP]) {
2517 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2518 dst->remote_ip.sa.sa_family = AF_INET;
2519 } else if (data[IFLA_VXLAN_GROUP6]) {
2520 if (!IS_ENABLED(CONFIG_IPV6))
2521 return -EPFNOSUPPORT;
2522
2523 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2524 sizeof(struct in6_addr));
2525 dst->remote_ip.sa.sa_family = AF_INET6;
2526 use_ipv6 = true;
2527 }
2528
2529 if (data[IFLA_VXLAN_LOCAL]) {
2530 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2531 vxlan->saddr.sa.sa_family = AF_INET;
2532 } else if (data[IFLA_VXLAN_LOCAL6]) {
2533 if (!IS_ENABLED(CONFIG_IPV6))
2534 return -EPFNOSUPPORT;
2535
2536 /* TODO: respect scope id */
2537 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2538 sizeof(struct in6_addr));
2539 vxlan->saddr.sa.sa_family = AF_INET6;
2540 use_ipv6 = true;
2541 }
2542
2543 if (data[IFLA_VXLAN_LINK] &&
2544 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2545 struct net_device *lowerdev
2546 = __dev_get_by_index(net, dst->remote_ifindex);
2547
2548 if (!lowerdev) {
2549 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2550 return -ENODEV;
2551 }
2552
2553 #if IS_ENABLED(CONFIG_IPV6)
2554 if (use_ipv6) {
2555 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2556 if (idev && idev->cnf.disable_ipv6) {
2557 pr_info("IPv6 is disabled via sysctl\n");
2558 return -EPERM;
2559 }
2560 vxlan->flags |= VXLAN_F_IPV6;
2561 }
2562 #endif
2563
2564 if (!tb[IFLA_MTU])
2565 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2566
2567 /* update header length based on lower device */
2568 dev->hard_header_len = lowerdev->hard_header_len +
2569 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2570 } else if (use_ipv6)
2571 vxlan->flags |= VXLAN_F_IPV6;
2572
2573 if (data[IFLA_VXLAN_TOS])
2574 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2575
2576 if (data[IFLA_VXLAN_TTL])
2577 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2578
2579 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2580 vxlan->flags |= VXLAN_F_LEARN;
2581
2582 if (data[IFLA_VXLAN_AGEING])
2583 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2584 else
2585 vxlan->age_interval = FDB_AGE_DEFAULT;
2586
2587 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2588 vxlan->flags |= VXLAN_F_PROXY;
2589
2590 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2591 vxlan->flags |= VXLAN_F_RSC;
2592
2593 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2594 vxlan->flags |= VXLAN_F_L2MISS;
2595
2596 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2597 vxlan->flags |= VXLAN_F_L3MISS;
2598
2599 if (data[IFLA_VXLAN_LIMIT])
2600 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2601
2602 if (data[IFLA_VXLAN_PORT_RANGE]) {
2603 const struct ifla_vxlan_port_range *p
2604 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2605 vxlan->port_min = ntohs(p->low);
2606 vxlan->port_max = ntohs(p->high);
2607 }
2608
2609 if (data[IFLA_VXLAN_PORT])
2610 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2611
2612 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
2613 pr_info("duplicate VNI %u\n", vni);
2614 return -EEXIST;
2615 }
2616
2617 SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
2618
2619 /* create an fdb entry for a valid default destination */
2620 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2621 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2622 &vxlan->default_dst.remote_ip,
2623 NUD_REACHABLE|NUD_PERMANENT,
2624 NLM_F_EXCL|NLM_F_CREATE,
2625 vxlan->dst_port,
2626 vxlan->default_dst.remote_vni,
2627 vxlan->default_dst.remote_ifindex,
2628 NTF_SELF);
2629 if (err)
2630 return err;
2631 }
2632
2633 err = register_netdevice(dev);
2634 if (err) {
2635 vxlan_fdb_delete_default(vxlan);
2636 return err;
2637 }
2638
2639 list_add(&vxlan->next, &vn->vxlan_list);
2640
2641 return 0;
2642 }
2643
2644 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2645 {
2646 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2647 struct vxlan_dev *vxlan = netdev_priv(dev);
2648
2649 spin_lock(&vn->sock_lock);
2650 if (!hlist_unhashed(&vxlan->hlist))
2651 hlist_del_rcu(&vxlan->hlist);
2652 spin_unlock(&vn->sock_lock);
2653
2654 list_del(&vxlan->next);
2655 unregister_netdevice_queue(dev, head);
2656 }
2657
2658 static size_t vxlan_get_size(const struct net_device *dev)
2659 {
2660
2661 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2662 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2663 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2664 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2665 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2666 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2667 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2668 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2669 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2670 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2671 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2672 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2673 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2674 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2675 nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
2676 0;
2677 }
2678
2679 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2680 {
2681 const struct vxlan_dev *vxlan = netdev_priv(dev);
2682 const struct vxlan_rdst *dst = &vxlan->default_dst;
2683 struct ifla_vxlan_port_range ports = {
2684 .low = htons(vxlan->port_min),
2685 .high = htons(vxlan->port_max),
2686 };
2687
2688 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2689 goto nla_put_failure;
2690
2691 if (!vxlan_addr_any(&dst->remote_ip)) {
2692 if (dst->remote_ip.sa.sa_family == AF_INET) {
2693 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2694 dst->remote_ip.sin.sin_addr.s_addr))
2695 goto nla_put_failure;
2696 #if IS_ENABLED(CONFIG_IPV6)
2697 } else {
2698 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2699 &dst->remote_ip.sin6.sin6_addr))
2700 goto nla_put_failure;
2701 #endif
2702 }
2703 }
2704
2705 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2706 goto nla_put_failure;
2707
2708 if (!vxlan_addr_any(&vxlan->saddr)) {
2709 if (vxlan->saddr.sa.sa_family == AF_INET) {
2710 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2711 vxlan->saddr.sin.sin_addr.s_addr))
2712 goto nla_put_failure;
2713 #if IS_ENABLED(CONFIG_IPV6)
2714 } else {
2715 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2716 &vxlan->saddr.sin6.sin6_addr))
2717 goto nla_put_failure;
2718 #endif
2719 }
2720 }
2721
2722 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2723 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2724 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2725 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2726 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2727 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2728 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2729 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2730 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2731 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2732 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2733 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2734 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2735 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
2736 goto nla_put_failure;
2737
2738 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2739 goto nla_put_failure;
2740
2741 return 0;
2742
2743 nla_put_failure:
2744 return -EMSGSIZE;
2745 }
2746
2747 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2748 .kind = "vxlan",
2749 .maxtype = IFLA_VXLAN_MAX,
2750 .policy = vxlan_policy,
2751 .priv_size = sizeof(struct vxlan_dev),
2752 .setup = vxlan_setup,
2753 .validate = vxlan_validate,
2754 .newlink = vxlan_newlink,
2755 .dellink = vxlan_dellink,
2756 .get_size = vxlan_get_size,
2757 .fill_info = vxlan_fill_info,
2758 };
2759
2760 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2761 struct net_device *dev)
2762 {
2763 struct vxlan_dev *vxlan, *next;
2764 LIST_HEAD(list_kill);
2765
2766 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2767 struct vxlan_rdst *dst = &vxlan->default_dst;
2768
2769 /* In case we created vxlan device with carrier
2770 * and we loose the carrier due to module unload
2771 * we also need to remove vxlan device. In other
2772 * cases, it's not necessary and remote_ifindex
2773 * is 0 here, so no matches.
2774 */
2775 if (dst->remote_ifindex == dev->ifindex)
2776 vxlan_dellink(vxlan->dev, &list_kill);
2777 }
2778
2779 unregister_netdevice_many(&list_kill);
2780 }
2781
2782 static int vxlan_lowerdev_event(struct notifier_block *unused,
2783 unsigned long event, void *ptr)
2784 {
2785 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2786 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2787
2788 if (event == NETDEV_UNREGISTER)
2789 vxlan_handle_lowerdev_unregister(vn, dev);
2790
2791 return NOTIFY_DONE;
2792 }
2793
2794 static struct notifier_block vxlan_notifier_block __read_mostly = {
2795 .notifier_call = vxlan_lowerdev_event,
2796 };
2797
2798 static __net_init int vxlan_init_net(struct net *net)
2799 {
2800 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2801 unsigned int h;
2802
2803 INIT_LIST_HEAD(&vn->vxlan_list);
2804 spin_lock_init(&vn->sock_lock);
2805
2806 for (h = 0; h < PORT_HASH_SIZE; ++h)
2807 INIT_HLIST_HEAD(&vn->sock_list[h]);
2808
2809 return 0;
2810 }
2811
2812 static struct pernet_operations vxlan_net_ops = {
2813 .init = vxlan_init_net,
2814 .id = &vxlan_net_id,
2815 .size = sizeof(struct vxlan_net),
2816 };
2817
2818 static int __init vxlan_init_module(void)
2819 {
2820 int rc;
2821
2822 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2823 if (!vxlan_wq)
2824 return -ENOMEM;
2825
2826 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2827
2828 rc = register_pernet_subsys(&vxlan_net_ops);
2829 if (rc)
2830 goto out1;
2831
2832 rc = register_netdevice_notifier(&vxlan_notifier_block);
2833 if (rc)
2834 goto out2;
2835
2836 rc = rtnl_link_register(&vxlan_link_ops);
2837 if (rc)
2838 goto out3;
2839
2840 return 0;
2841 out3:
2842 unregister_netdevice_notifier(&vxlan_notifier_block);
2843 out2:
2844 unregister_pernet_subsys(&vxlan_net_ops);
2845 out1:
2846 destroy_workqueue(vxlan_wq);
2847 return rc;
2848 }
2849 late_initcall(vxlan_init_module);
2850
2851 static void __exit vxlan_cleanup_module(void)
2852 {
2853 rtnl_link_unregister(&vxlan_link_ops);
2854 unregister_netdevice_notifier(&vxlan_notifier_block);
2855 destroy_workqueue(vxlan_wq);
2856 unregister_pernet_subsys(&vxlan_net_ops);
2857 /* rcu_barrier() is called by netns */
2858 }
2859 module_exit(vxlan_cleanup_module);
2860
2861 MODULE_LICENSE("GPL");
2862 MODULE_VERSION(VXLAN_VERSION);
2863 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
2864 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
2865 MODULE_ALIAS_RTNL_LINK("vxlan");
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