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Merge tag 'mfd-for-linus-3.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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, struct vxlan_fdb *fdb,
393 struct vxlan_rdst *rd, 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, rd);
404 if (err < 0) {
405 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
406 WARN_ON(err == -EMSGSIZE);
407 kfree_skb(skb);
408 goto errout;
409 }
410
411 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
412 return;
413 errout:
414 if (err < 0)
415 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
416 }
417
418 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
419 {
420 struct vxlan_dev *vxlan = netdev_priv(dev);
421 struct vxlan_fdb f = {
422 .state = NUD_STALE,
423 };
424 struct vxlan_rdst remote = {
425 .remote_ip = *ipa, /* goes to NDA_DST */
426 .remote_vni = VXLAN_N_VID,
427 };
428
429 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
430 }
431
432 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
433 {
434 struct vxlan_fdb f = {
435 .state = NUD_STALE,
436 };
437 struct vxlan_rdst remote = { };
438
439 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
440
441 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
442 }
443
444 /* Hash Ethernet address */
445 static u32 eth_hash(const unsigned char *addr)
446 {
447 u64 value = get_unaligned((u64 *)addr);
448
449 /* only want 6 bytes */
450 #ifdef __BIG_ENDIAN
451 value >>= 16;
452 #else
453 value <<= 16;
454 #endif
455 return hash_64(value, FDB_HASH_BITS);
456 }
457
458 /* Hash chain to use given mac address */
459 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
460 const u8 *mac)
461 {
462 return &vxlan->fdb_head[eth_hash(mac)];
463 }
464
465 /* Look up Ethernet address in forwarding table */
466 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
467 const u8 *mac)
468 {
469 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
470 struct vxlan_fdb *f;
471
472 hlist_for_each_entry_rcu(f, head, hlist) {
473 if (ether_addr_equal(mac, f->eth_addr))
474 return f;
475 }
476
477 return NULL;
478 }
479
480 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
481 const u8 *mac)
482 {
483 struct vxlan_fdb *f;
484
485 f = __vxlan_find_mac(vxlan, mac);
486 if (f)
487 f->used = jiffies;
488
489 return f;
490 }
491
492 /* caller should hold vxlan->hash_lock */
493 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
494 union vxlan_addr *ip, __be16 port,
495 __u32 vni, __u32 ifindex)
496 {
497 struct vxlan_rdst *rd;
498
499 list_for_each_entry(rd, &f->remotes, list) {
500 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
501 rd->remote_port == port &&
502 rd->remote_vni == vni &&
503 rd->remote_ifindex == ifindex)
504 return rd;
505 }
506
507 return NULL;
508 }
509
510 /* Replace destination of unicast mac */
511 static int vxlan_fdb_replace(struct vxlan_fdb *f,
512 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
513 {
514 struct vxlan_rdst *rd;
515
516 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
517 if (rd)
518 return 0;
519
520 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
521 if (!rd)
522 return 0;
523 rd->remote_ip = *ip;
524 rd->remote_port = port;
525 rd->remote_vni = vni;
526 rd->remote_ifindex = ifindex;
527 return 1;
528 }
529
530 /* Add/update destinations for multicast */
531 static int vxlan_fdb_append(struct vxlan_fdb *f,
532 union vxlan_addr *ip, __be16 port, __u32 vni,
533 __u32 ifindex, struct vxlan_rdst **rdp)
534 {
535 struct vxlan_rdst *rd;
536
537 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
538 if (rd)
539 return 0;
540
541 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
542 if (rd == NULL)
543 return -ENOBUFS;
544 rd->remote_ip = *ip;
545 rd->remote_port = port;
546 rd->remote_vni = vni;
547 rd->remote_ifindex = ifindex;
548
549 list_add_tail_rcu(&rd->list, &f->remotes);
550
551 *rdp = rd;
552 return 1;
553 }
554
555 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
556 {
557 struct sk_buff *p, **pp = NULL;
558 struct vxlanhdr *vh, *vh2;
559 struct ethhdr *eh, *eh2;
560 unsigned int hlen, off_vx, off_eth;
561 const struct packet_offload *ptype;
562 __be16 type;
563 int flush = 1;
564
565 off_vx = skb_gro_offset(skb);
566 hlen = off_vx + sizeof(*vh);
567 vh = skb_gro_header_fast(skb, off_vx);
568 if (skb_gro_header_hard(skb, hlen)) {
569 vh = skb_gro_header_slow(skb, hlen, off_vx);
570 if (unlikely(!vh))
571 goto out;
572 }
573 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
574
575 off_eth = skb_gro_offset(skb);
576 hlen = off_eth + sizeof(*eh);
577 eh = skb_gro_header_fast(skb, off_eth);
578 if (skb_gro_header_hard(skb, hlen)) {
579 eh = skb_gro_header_slow(skb, hlen, off_eth);
580 if (unlikely(!eh))
581 goto out;
582 }
583
584 flush = 0;
585
586 for (p = *head; p; p = p->next) {
587 if (!NAPI_GRO_CB(p)->same_flow)
588 continue;
589
590 vh2 = (struct vxlanhdr *)(p->data + off_vx);
591 eh2 = (struct ethhdr *)(p->data + off_eth);
592 if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
593 NAPI_GRO_CB(p)->same_flow = 0;
594 continue;
595 }
596 }
597
598 type = eh->h_proto;
599
600 rcu_read_lock();
601 ptype = gro_find_receive_by_type(type);
602 if (ptype == NULL) {
603 flush = 1;
604 goto out_unlock;
605 }
606
607 skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
608 pp = ptype->callbacks.gro_receive(head, skb);
609
610 out_unlock:
611 rcu_read_unlock();
612 out:
613 NAPI_GRO_CB(skb)->flush |= flush;
614
615 return pp;
616 }
617
618 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
619 {
620 struct ethhdr *eh;
621 struct packet_offload *ptype;
622 __be16 type;
623 int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
624 int err = -ENOSYS;
625
626 eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));
627 type = eh->h_proto;
628
629 rcu_read_lock();
630 ptype = gro_find_complete_by_type(type);
631 if (ptype != NULL)
632 err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len);
633
634 rcu_read_unlock();
635 return err;
636 }
637
638 /* Notify netdevs that UDP port started listening */
639 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
640 {
641 struct net_device *dev;
642 struct sock *sk = vs->sock->sk;
643 struct net *net = sock_net(sk);
644 sa_family_t sa_family = sk->sk_family;
645 __be16 port = inet_sk(sk)->inet_sport;
646 int err;
647
648 if (sa_family == AF_INET) {
649 err = udp_add_offload(&vs->udp_offloads);
650 if (err)
651 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
652 }
653
654 rcu_read_lock();
655 for_each_netdev_rcu(net, dev) {
656 if (dev->netdev_ops->ndo_add_vxlan_port)
657 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
658 port);
659 }
660 rcu_read_unlock();
661 }
662
663 /* Notify netdevs that UDP port is no more listening */
664 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
665 {
666 struct net_device *dev;
667 struct sock *sk = vs->sock->sk;
668 struct net *net = sock_net(sk);
669 sa_family_t sa_family = sk->sk_family;
670 __be16 port = inet_sk(sk)->inet_sport;
671
672 rcu_read_lock();
673 for_each_netdev_rcu(net, dev) {
674 if (dev->netdev_ops->ndo_del_vxlan_port)
675 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
676 port);
677 }
678 rcu_read_unlock();
679
680 if (sa_family == AF_INET)
681 udp_del_offload(&vs->udp_offloads);
682 }
683
684 /* Add new entry to forwarding table -- assumes lock held */
685 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
686 const u8 *mac, union vxlan_addr *ip,
687 __u16 state, __u16 flags,
688 __be16 port, __u32 vni, __u32 ifindex,
689 __u8 ndm_flags)
690 {
691 struct vxlan_rdst *rd = NULL;
692 struct vxlan_fdb *f;
693 int notify = 0;
694
695 f = __vxlan_find_mac(vxlan, mac);
696 if (f) {
697 if (flags & NLM_F_EXCL) {
698 netdev_dbg(vxlan->dev,
699 "lost race to create %pM\n", mac);
700 return -EEXIST;
701 }
702 if (f->state != state) {
703 f->state = state;
704 f->updated = jiffies;
705 notify = 1;
706 }
707 if (f->flags != ndm_flags) {
708 f->flags = ndm_flags;
709 f->updated = jiffies;
710 notify = 1;
711 }
712 if ((flags & NLM_F_REPLACE)) {
713 /* Only change unicasts */
714 if (!(is_multicast_ether_addr(f->eth_addr) ||
715 is_zero_ether_addr(f->eth_addr))) {
716 int rc = vxlan_fdb_replace(f, ip, port, vni,
717 ifindex);
718
719 if (rc < 0)
720 return rc;
721 notify |= rc;
722 } else
723 return -EOPNOTSUPP;
724 }
725 if ((flags & NLM_F_APPEND) &&
726 (is_multicast_ether_addr(f->eth_addr) ||
727 is_zero_ether_addr(f->eth_addr))) {
728 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
729 &rd);
730
731 if (rc < 0)
732 return rc;
733 notify |= rc;
734 }
735 } else {
736 if (!(flags & NLM_F_CREATE))
737 return -ENOENT;
738
739 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
740 return -ENOSPC;
741
742 /* Disallow replace to add a multicast entry */
743 if ((flags & NLM_F_REPLACE) &&
744 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
745 return -EOPNOTSUPP;
746
747 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
748 f = kmalloc(sizeof(*f), GFP_ATOMIC);
749 if (!f)
750 return -ENOMEM;
751
752 notify = 1;
753 f->state = state;
754 f->flags = ndm_flags;
755 f->updated = f->used = jiffies;
756 INIT_LIST_HEAD(&f->remotes);
757 memcpy(f->eth_addr, mac, ETH_ALEN);
758
759 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
760
761 ++vxlan->addrcnt;
762 hlist_add_head_rcu(&f->hlist,
763 vxlan_fdb_head(vxlan, mac));
764 }
765
766 if (notify) {
767 if (rd == NULL)
768 rd = first_remote_rtnl(f);
769 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
770 }
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, first_remote_rtnl(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 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
878 return -EAFNOSUPPORT;
879
880 spin_lock_bh(&vxlan->hash_lock);
881 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
882 port, vni, ifindex, ndm->ndm_flags);
883 spin_unlock_bh(&vxlan->hash_lock);
884
885 return err;
886 }
887
888 /* Delete entry (via netlink) */
889 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
890 struct net_device *dev,
891 const unsigned char *addr)
892 {
893 struct vxlan_dev *vxlan = netdev_priv(dev);
894 struct vxlan_fdb *f;
895 struct vxlan_rdst *rd = NULL;
896 union vxlan_addr ip;
897 __be16 port;
898 u32 vni, ifindex;
899 int err;
900
901 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
902 if (err)
903 return err;
904
905 err = -ENOENT;
906
907 spin_lock_bh(&vxlan->hash_lock);
908 f = vxlan_find_mac(vxlan, addr);
909 if (!f)
910 goto out;
911
912 if (!vxlan_addr_any(&ip)) {
913 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
914 if (!rd)
915 goto out;
916 }
917
918 err = 0;
919
920 /* remove a destination if it's not the only one on the list,
921 * otherwise destroy the fdb entry
922 */
923 if (rd && !list_is_singular(&f->remotes)) {
924 list_del_rcu(&rd->list);
925 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
926 kfree_rcu(rd, rcu);
927 goto out;
928 }
929
930 vxlan_fdb_destroy(vxlan, f);
931
932 out:
933 spin_unlock_bh(&vxlan->hash_lock);
934
935 return err;
936 }
937
938 /* Dump forwarding table */
939 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
940 struct net_device *dev, int idx)
941 {
942 struct vxlan_dev *vxlan = netdev_priv(dev);
943 unsigned int h;
944
945 for (h = 0; h < FDB_HASH_SIZE; ++h) {
946 struct vxlan_fdb *f;
947 int err;
948
949 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
950 struct vxlan_rdst *rd;
951
952 if (idx < cb->args[0])
953 goto skip;
954
955 list_for_each_entry_rcu(rd, &f->remotes, list) {
956 err = vxlan_fdb_info(skb, vxlan, f,
957 NETLINK_CB(cb->skb).portid,
958 cb->nlh->nlmsg_seq,
959 RTM_NEWNEIGH,
960 NLM_F_MULTI, rd);
961 if (err < 0)
962 goto out;
963 }
964 skip:
965 ++idx;
966 }
967 }
968 out:
969 return idx;
970 }
971
972 /* Watch incoming packets to learn mapping between Ethernet address
973 * and Tunnel endpoint.
974 * Return true if packet is bogus and should be droppped.
975 */
976 static bool vxlan_snoop(struct net_device *dev,
977 union vxlan_addr *src_ip, const u8 *src_mac)
978 {
979 struct vxlan_dev *vxlan = netdev_priv(dev);
980 struct vxlan_fdb *f;
981
982 f = vxlan_find_mac(vxlan, src_mac);
983 if (likely(f)) {
984 struct vxlan_rdst *rdst = first_remote_rcu(f);
985
986 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
987 return false;
988
989 /* Don't migrate static entries, drop packets */
990 if (f->state & NUD_NOARP)
991 return true;
992
993 if (net_ratelimit())
994 netdev_info(dev,
995 "%pM migrated from %pIS to %pIS\n",
996 src_mac, &rdst->remote_ip, &src_ip);
997
998 rdst->remote_ip = *src_ip;
999 f->updated = jiffies;
1000 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1001 } else {
1002 /* learned new entry */
1003 spin_lock(&vxlan->hash_lock);
1004
1005 /* close off race between vxlan_flush and incoming packets */
1006 if (netif_running(dev))
1007 vxlan_fdb_create(vxlan, src_mac, src_ip,
1008 NUD_REACHABLE,
1009 NLM_F_EXCL|NLM_F_CREATE,
1010 vxlan->dst_port,
1011 vxlan->default_dst.remote_vni,
1012 0, NTF_SELF);
1013 spin_unlock(&vxlan->hash_lock);
1014 }
1015
1016 return false;
1017 }
1018
1019 /* See if multicast group is already in use by other ID */
1020 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1021 {
1022 struct vxlan_dev *vxlan;
1023
1024 /* The vxlan_sock is only used by dev, leaving group has
1025 * no effect on other vxlan devices.
1026 */
1027 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1028 return false;
1029
1030 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1031 if (!netif_running(vxlan->dev) || vxlan == dev)
1032 continue;
1033
1034 if (vxlan->vn_sock != dev->vn_sock)
1035 continue;
1036
1037 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1038 &dev->default_dst.remote_ip))
1039 continue;
1040
1041 if (vxlan->default_dst.remote_ifindex !=
1042 dev->default_dst.remote_ifindex)
1043 continue;
1044
1045 return true;
1046 }
1047
1048 return false;
1049 }
1050
1051 static void vxlan_sock_hold(struct vxlan_sock *vs)
1052 {
1053 atomic_inc(&vs->refcnt);
1054 }
1055
1056 void vxlan_sock_release(struct vxlan_sock *vs)
1057 {
1058 struct sock *sk = vs->sock->sk;
1059 struct net *net = sock_net(sk);
1060 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1061
1062 if (!atomic_dec_and_test(&vs->refcnt))
1063 return;
1064
1065 spin_lock(&vn->sock_lock);
1066 hlist_del_rcu(&vs->hlist);
1067 rcu_assign_sk_user_data(vs->sock->sk, NULL);
1068 vxlan_notify_del_rx_port(vs);
1069 spin_unlock(&vn->sock_lock);
1070
1071 queue_work(vxlan_wq, &vs->del_work);
1072 }
1073 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1074
1075 /* Callback to update multicast group membership when first VNI on
1076 * multicast asddress is brought up
1077 * Done as workqueue because ip_mc_join_group acquires RTNL.
1078 */
1079 static void vxlan_igmp_join(struct work_struct *work)
1080 {
1081 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1082 struct vxlan_sock *vs = vxlan->vn_sock;
1083 struct sock *sk = vs->sock->sk;
1084 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1085 int ifindex = vxlan->default_dst.remote_ifindex;
1086
1087 lock_sock(sk);
1088 if (ip->sa.sa_family == AF_INET) {
1089 struct ip_mreqn mreq = {
1090 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1091 .imr_ifindex = ifindex,
1092 };
1093
1094 ip_mc_join_group(sk, &mreq);
1095 #if IS_ENABLED(CONFIG_IPV6)
1096 } else {
1097 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1098 &ip->sin6.sin6_addr);
1099 #endif
1100 }
1101 release_sock(sk);
1102
1103 vxlan_sock_release(vs);
1104 dev_put(vxlan->dev);
1105 }
1106
1107 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1108 static void vxlan_igmp_leave(struct work_struct *work)
1109 {
1110 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1111 struct vxlan_sock *vs = vxlan->vn_sock;
1112 struct sock *sk = vs->sock->sk;
1113 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1114 int ifindex = vxlan->default_dst.remote_ifindex;
1115
1116 lock_sock(sk);
1117 if (ip->sa.sa_family == AF_INET) {
1118 struct ip_mreqn mreq = {
1119 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1120 .imr_ifindex = ifindex,
1121 };
1122
1123 ip_mc_leave_group(sk, &mreq);
1124 #if IS_ENABLED(CONFIG_IPV6)
1125 } else {
1126 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1127 &ip->sin6.sin6_addr);
1128 #endif
1129 }
1130
1131 release_sock(sk);
1132
1133 vxlan_sock_release(vs);
1134 dev_put(vxlan->dev);
1135 }
1136
1137 /* Callback from net/ipv4/udp.c to receive packets */
1138 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1139 {
1140 struct vxlan_sock *vs;
1141 struct vxlanhdr *vxh;
1142
1143 /* Need Vxlan and inner Ethernet header to be present */
1144 if (!pskb_may_pull(skb, VXLAN_HLEN))
1145 goto error;
1146
1147 /* Return packets with reserved bits set */
1148 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1149 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1150 (vxh->vx_vni & htonl(0xff))) {
1151 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1152 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1153 goto error;
1154 }
1155
1156 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1157 goto drop;
1158
1159 vs = rcu_dereference_sk_user_data(sk);
1160 if (!vs)
1161 goto drop;
1162
1163 /* If the NIC driver gave us an encapsulated packet
1164 * with the encapsulation mark, the device checksummed it
1165 * for us. Otherwise force the upper layers to verify it.
1166 */
1167 if ((skb->ip_summed != CHECKSUM_UNNECESSARY && skb->ip_summed != CHECKSUM_PARTIAL) ||
1168 !skb->encapsulation)
1169 skb->ip_summed = CHECKSUM_NONE;
1170
1171 skb->encapsulation = 0;
1172
1173 vs->rcv(vs, skb, vxh->vx_vni);
1174 return 0;
1175
1176 drop:
1177 /* Consume bad packet */
1178 kfree_skb(skb);
1179 return 0;
1180
1181 error:
1182 /* Return non vxlan pkt */
1183 return 1;
1184 }
1185
1186 static void vxlan_rcv(struct vxlan_sock *vs,
1187 struct sk_buff *skb, __be32 vx_vni)
1188 {
1189 struct iphdr *oip = NULL;
1190 struct ipv6hdr *oip6 = NULL;
1191 struct vxlan_dev *vxlan;
1192 struct pcpu_sw_netstats *stats;
1193 union vxlan_addr saddr;
1194 __u32 vni;
1195 int err = 0;
1196 union vxlan_addr *remote_ip;
1197
1198 vni = ntohl(vx_vni) >> 8;
1199 /* Is this VNI defined? */
1200 vxlan = vxlan_vs_find_vni(vs, vni);
1201 if (!vxlan)
1202 goto drop;
1203
1204 remote_ip = &vxlan->default_dst.remote_ip;
1205 skb_reset_mac_header(skb);
1206 skb->protocol = eth_type_trans(skb, vxlan->dev);
1207
1208 /* Ignore packet loops (and multicast echo) */
1209 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1210 goto drop;
1211
1212 /* Re-examine inner Ethernet packet */
1213 if (remote_ip->sa.sa_family == AF_INET) {
1214 oip = ip_hdr(skb);
1215 saddr.sin.sin_addr.s_addr = oip->saddr;
1216 saddr.sa.sa_family = AF_INET;
1217 #if IS_ENABLED(CONFIG_IPV6)
1218 } else {
1219 oip6 = ipv6_hdr(skb);
1220 saddr.sin6.sin6_addr = oip6->saddr;
1221 saddr.sa.sa_family = AF_INET6;
1222 #endif
1223 }
1224
1225 if ((vxlan->flags & VXLAN_F_LEARN) &&
1226 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1227 goto drop;
1228
1229 skb_reset_network_header(skb);
1230
1231 if (oip6)
1232 err = IP6_ECN_decapsulate(oip6, skb);
1233 if (oip)
1234 err = IP_ECN_decapsulate(oip, skb);
1235
1236 if (unlikely(err)) {
1237 if (log_ecn_error) {
1238 if (oip6)
1239 net_info_ratelimited("non-ECT from %pI6\n",
1240 &oip6->saddr);
1241 if (oip)
1242 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1243 &oip->saddr, oip->tos);
1244 }
1245 if (err > 1) {
1246 ++vxlan->dev->stats.rx_frame_errors;
1247 ++vxlan->dev->stats.rx_errors;
1248 goto drop;
1249 }
1250 }
1251
1252 stats = this_cpu_ptr(vxlan->dev->tstats);
1253 u64_stats_update_begin(&stats->syncp);
1254 stats->rx_packets++;
1255 stats->rx_bytes += skb->len;
1256 u64_stats_update_end(&stats->syncp);
1257
1258 netif_rx(skb);
1259
1260 return;
1261 drop:
1262 /* Consume bad packet */
1263 kfree_skb(skb);
1264 }
1265
1266 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1267 {
1268 struct vxlan_dev *vxlan = netdev_priv(dev);
1269 struct arphdr *parp;
1270 u8 *arpptr, *sha;
1271 __be32 sip, tip;
1272 struct neighbour *n;
1273
1274 if (dev->flags & IFF_NOARP)
1275 goto out;
1276
1277 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1278 dev->stats.tx_dropped++;
1279 goto out;
1280 }
1281 parp = arp_hdr(skb);
1282
1283 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1284 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1285 parp->ar_pro != htons(ETH_P_IP) ||
1286 parp->ar_op != htons(ARPOP_REQUEST) ||
1287 parp->ar_hln != dev->addr_len ||
1288 parp->ar_pln != 4)
1289 goto out;
1290 arpptr = (u8 *)parp + sizeof(struct arphdr);
1291 sha = arpptr;
1292 arpptr += dev->addr_len; /* sha */
1293 memcpy(&sip, arpptr, sizeof(sip));
1294 arpptr += sizeof(sip);
1295 arpptr += dev->addr_len; /* tha */
1296 memcpy(&tip, arpptr, sizeof(tip));
1297
1298 if (ipv4_is_loopback(tip) ||
1299 ipv4_is_multicast(tip))
1300 goto out;
1301
1302 n = neigh_lookup(&arp_tbl, &tip, dev);
1303
1304 if (n) {
1305 struct vxlan_fdb *f;
1306 struct sk_buff *reply;
1307
1308 if (!(n->nud_state & NUD_CONNECTED)) {
1309 neigh_release(n);
1310 goto out;
1311 }
1312
1313 f = vxlan_find_mac(vxlan, n->ha);
1314 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1315 /* bridge-local neighbor */
1316 neigh_release(n);
1317 goto out;
1318 }
1319
1320 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1321 n->ha, sha);
1322
1323 neigh_release(n);
1324
1325 if (reply == NULL)
1326 goto out;
1327
1328 skb_reset_mac_header(reply);
1329 __skb_pull(reply, skb_network_offset(reply));
1330 reply->ip_summed = CHECKSUM_UNNECESSARY;
1331 reply->pkt_type = PACKET_HOST;
1332
1333 if (netif_rx_ni(reply) == NET_RX_DROP)
1334 dev->stats.rx_dropped++;
1335 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1336 union vxlan_addr ipa = {
1337 .sin.sin_addr.s_addr = tip,
1338 .sa.sa_family = AF_INET,
1339 };
1340
1341 vxlan_ip_miss(dev, &ipa);
1342 }
1343 out:
1344 consume_skb(skb);
1345 return NETDEV_TX_OK;
1346 }
1347
1348 #if IS_ENABLED(CONFIG_IPV6)
1349
1350 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1351 struct neighbour *n, bool isrouter)
1352 {
1353 struct net_device *dev = request->dev;
1354 struct sk_buff *reply;
1355 struct nd_msg *ns, *na;
1356 struct ipv6hdr *pip6;
1357 u8 *daddr;
1358 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1359 int ns_olen;
1360 int i, len;
1361
1362 if (dev == NULL)
1363 return NULL;
1364
1365 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1366 sizeof(*na) + na_olen + dev->needed_tailroom;
1367 reply = alloc_skb(len, GFP_ATOMIC);
1368 if (reply == NULL)
1369 return NULL;
1370
1371 reply->protocol = htons(ETH_P_IPV6);
1372 reply->dev = dev;
1373 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1374 skb_push(reply, sizeof(struct ethhdr));
1375 skb_set_mac_header(reply, 0);
1376
1377 ns = (struct nd_msg *)skb_transport_header(request);
1378
1379 daddr = eth_hdr(request)->h_source;
1380 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1381 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1382 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1383 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1384 break;
1385 }
1386 }
1387
1388 /* Ethernet header */
1389 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1390 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1391 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1392 reply->protocol = htons(ETH_P_IPV6);
1393
1394 skb_pull(reply, sizeof(struct ethhdr));
1395 skb_set_network_header(reply, 0);
1396 skb_put(reply, sizeof(struct ipv6hdr));
1397
1398 /* IPv6 header */
1399
1400 pip6 = ipv6_hdr(reply);
1401 memset(pip6, 0, sizeof(struct ipv6hdr));
1402 pip6->version = 6;
1403 pip6->priority = ipv6_hdr(request)->priority;
1404 pip6->nexthdr = IPPROTO_ICMPV6;
1405 pip6->hop_limit = 255;
1406 pip6->daddr = ipv6_hdr(request)->saddr;
1407 pip6->saddr = *(struct in6_addr *)n->primary_key;
1408
1409 skb_pull(reply, sizeof(struct ipv6hdr));
1410 skb_set_transport_header(reply, 0);
1411
1412 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1413
1414 /* Neighbor Advertisement */
1415 memset(na, 0, sizeof(*na)+na_olen);
1416 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1417 na->icmph.icmp6_router = isrouter;
1418 na->icmph.icmp6_override = 1;
1419 na->icmph.icmp6_solicited = 1;
1420 na->target = ns->target;
1421 ether_addr_copy(&na->opt[2], n->ha);
1422 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1423 na->opt[1] = na_olen >> 3;
1424
1425 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1426 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1427 csum_partial(na, sizeof(*na)+na_olen, 0));
1428
1429 pip6->payload_len = htons(sizeof(*na)+na_olen);
1430
1431 skb_push(reply, sizeof(struct ipv6hdr));
1432
1433 reply->ip_summed = CHECKSUM_UNNECESSARY;
1434
1435 return reply;
1436 }
1437
1438 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1439 {
1440 struct vxlan_dev *vxlan = netdev_priv(dev);
1441 struct nd_msg *msg;
1442 const struct ipv6hdr *iphdr;
1443 const struct in6_addr *saddr, *daddr;
1444 struct neighbour *n;
1445 struct inet6_dev *in6_dev;
1446
1447 in6_dev = __in6_dev_get(dev);
1448 if (!in6_dev)
1449 goto out;
1450
1451 if (!pskb_may_pull(skb, skb->len))
1452 goto out;
1453
1454 iphdr = ipv6_hdr(skb);
1455 saddr = &iphdr->saddr;
1456 daddr = &iphdr->daddr;
1457
1458 msg = (struct nd_msg *)skb_transport_header(skb);
1459 if (msg->icmph.icmp6_code != 0 ||
1460 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1461 goto out;
1462
1463 if (ipv6_addr_loopback(daddr) ||
1464 ipv6_addr_is_multicast(&msg->target))
1465 goto out;
1466
1467 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1468
1469 if (n) {
1470 struct vxlan_fdb *f;
1471 struct sk_buff *reply;
1472
1473 if (!(n->nud_state & NUD_CONNECTED)) {
1474 neigh_release(n);
1475 goto out;
1476 }
1477
1478 f = vxlan_find_mac(vxlan, n->ha);
1479 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1480 /* bridge-local neighbor */
1481 neigh_release(n);
1482 goto out;
1483 }
1484
1485 reply = vxlan_na_create(skb, n,
1486 !!(f ? f->flags & NTF_ROUTER : 0));
1487
1488 neigh_release(n);
1489
1490 if (reply == NULL)
1491 goto out;
1492
1493 if (netif_rx_ni(reply) == NET_RX_DROP)
1494 dev->stats.rx_dropped++;
1495
1496 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1497 union vxlan_addr ipa = {
1498 .sin6.sin6_addr = msg->target,
1499 .sa.sa_family = AF_INET6,
1500 };
1501
1502 vxlan_ip_miss(dev, &ipa);
1503 }
1504
1505 out:
1506 consume_skb(skb);
1507 return NETDEV_TX_OK;
1508 }
1509 #endif
1510
1511 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1512 {
1513 struct vxlan_dev *vxlan = netdev_priv(dev);
1514 struct neighbour *n;
1515
1516 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1517 return false;
1518
1519 n = NULL;
1520 switch (ntohs(eth_hdr(skb)->h_proto)) {
1521 case ETH_P_IP:
1522 {
1523 struct iphdr *pip;
1524
1525 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1526 return false;
1527 pip = ip_hdr(skb);
1528 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1529 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1530 union vxlan_addr ipa = {
1531 .sin.sin_addr.s_addr = pip->daddr,
1532 .sa.sa_family = AF_INET,
1533 };
1534
1535 vxlan_ip_miss(dev, &ipa);
1536 return false;
1537 }
1538
1539 break;
1540 }
1541 #if IS_ENABLED(CONFIG_IPV6)
1542 case ETH_P_IPV6:
1543 {
1544 struct ipv6hdr *pip6;
1545
1546 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1547 return false;
1548 pip6 = ipv6_hdr(skb);
1549 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1550 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1551 union vxlan_addr ipa = {
1552 .sin6.sin6_addr = pip6->daddr,
1553 .sa.sa_family = AF_INET6,
1554 };
1555
1556 vxlan_ip_miss(dev, &ipa);
1557 return false;
1558 }
1559
1560 break;
1561 }
1562 #endif
1563 default:
1564 return false;
1565 }
1566
1567 if (n) {
1568 bool diff;
1569
1570 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1571 if (diff) {
1572 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1573 dev->addr_len);
1574 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1575 }
1576 neigh_release(n);
1577 return diff;
1578 }
1579
1580 return false;
1581 }
1582
1583 /* Compute source port for outgoing packet
1584 * first choice to use L4 flow hash since it will spread
1585 * better and maybe available from hardware
1586 * secondary choice is to use jhash on the Ethernet header
1587 */
1588 __be16 vxlan_src_port(__u16 port_min, __u16 port_max, struct sk_buff *skb)
1589 {
1590 unsigned int range = (port_max - port_min) + 1;
1591 u32 hash;
1592
1593 hash = skb_get_hash(skb);
1594 if (!hash)
1595 hash = jhash(skb->data, 2 * ETH_ALEN,
1596 (__force u32) skb->protocol);
1597
1598 return htons((((u64) hash * range) >> 32) + port_min);
1599 }
1600 EXPORT_SYMBOL_GPL(vxlan_src_port);
1601
1602 static int handle_offloads(struct sk_buff *skb)
1603 {
1604 if (skb_is_gso(skb)) {
1605 int err = skb_unclone(skb, GFP_ATOMIC);
1606 if (unlikely(err))
1607 return err;
1608
1609 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
1610 } else if (skb->ip_summed != CHECKSUM_PARTIAL)
1611 skb->ip_summed = CHECKSUM_NONE;
1612
1613 return 0;
1614 }
1615
1616 #if IS_ENABLED(CONFIG_IPV6)
1617 static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1618 struct dst_entry *dst, struct sk_buff *skb,
1619 struct net_device *dev, struct in6_addr *saddr,
1620 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1621 __be16 src_port, __be16 dst_port, __be32 vni)
1622 {
1623 struct ipv6hdr *ip6h;
1624 struct vxlanhdr *vxh;
1625 struct udphdr *uh;
1626 int min_headroom;
1627 int err;
1628
1629 if (!skb->encapsulation) {
1630 skb_reset_inner_headers(skb);
1631 skb->encapsulation = 1;
1632 }
1633
1634 skb_scrub_packet(skb, false);
1635
1636 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1637 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1638 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1639
1640 /* Need space for new headers (invalidates iph ptr) */
1641 err = skb_cow_head(skb, min_headroom);
1642 if (unlikely(err))
1643 return err;
1644
1645 if (vlan_tx_tag_present(skb)) {
1646 if (WARN_ON(!__vlan_put_tag(skb,
1647 skb->vlan_proto,
1648 vlan_tx_tag_get(skb))))
1649 return -ENOMEM;
1650
1651 skb->vlan_tci = 0;
1652 }
1653
1654 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1655 vxh->vx_flags = htonl(VXLAN_FLAGS);
1656 vxh->vx_vni = vni;
1657
1658 __skb_push(skb, sizeof(*uh));
1659 skb_reset_transport_header(skb);
1660 uh = udp_hdr(skb);
1661
1662 uh->dest = dst_port;
1663 uh->source = src_port;
1664
1665 uh->len = htons(skb->len);
1666 uh->check = 0;
1667
1668 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1669 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
1670 IPSKB_REROUTED);
1671 skb_dst_set(skb, dst);
1672
1673 if (!skb_is_gso(skb) && !(dst->dev->features & NETIF_F_IPV6_CSUM)) {
1674 __wsum csum = skb_checksum(skb, 0, skb->len, 0);
1675 skb->ip_summed = CHECKSUM_UNNECESSARY;
1676 uh->check = csum_ipv6_magic(saddr, daddr, skb->len,
1677 IPPROTO_UDP, csum);
1678 if (uh->check == 0)
1679 uh->check = CSUM_MANGLED_0;
1680 } else {
1681 skb->ip_summed = CHECKSUM_PARTIAL;
1682 skb->csum_start = skb_transport_header(skb) - skb->head;
1683 skb->csum_offset = offsetof(struct udphdr, check);
1684 uh->check = ~csum_ipv6_magic(saddr, daddr,
1685 skb->len, IPPROTO_UDP, 0);
1686 }
1687
1688 __skb_push(skb, sizeof(*ip6h));
1689 skb_reset_network_header(skb);
1690 ip6h = ipv6_hdr(skb);
1691 ip6h->version = 6;
1692 ip6h->priority = prio;
1693 ip6h->flow_lbl[0] = 0;
1694 ip6h->flow_lbl[1] = 0;
1695 ip6h->flow_lbl[2] = 0;
1696 ip6h->payload_len = htons(skb->len);
1697 ip6h->nexthdr = IPPROTO_UDP;
1698 ip6h->hop_limit = ttl;
1699 ip6h->daddr = *daddr;
1700 ip6h->saddr = *saddr;
1701
1702 err = handle_offloads(skb);
1703 if (err)
1704 return err;
1705
1706 ip6tunnel_xmit(skb, dev);
1707 return 0;
1708 }
1709 #endif
1710
1711 int vxlan_xmit_skb(struct vxlan_sock *vs,
1712 struct rtable *rt, struct sk_buff *skb,
1713 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1714 __be16 src_port, __be16 dst_port, __be32 vni)
1715 {
1716 struct vxlanhdr *vxh;
1717 struct udphdr *uh;
1718 int min_headroom;
1719 int err;
1720
1721 if (!skb->encapsulation) {
1722 skb_reset_inner_headers(skb);
1723 skb->encapsulation = 1;
1724 }
1725
1726 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1727 + VXLAN_HLEN + sizeof(struct iphdr)
1728 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1729
1730 /* Need space for new headers (invalidates iph ptr) */
1731 err = skb_cow_head(skb, min_headroom);
1732 if (unlikely(err))
1733 return err;
1734
1735 if (vlan_tx_tag_present(skb)) {
1736 if (WARN_ON(!__vlan_put_tag(skb,
1737 skb->vlan_proto,
1738 vlan_tx_tag_get(skb))))
1739 return -ENOMEM;
1740
1741 skb->vlan_tci = 0;
1742 }
1743
1744 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1745 vxh->vx_flags = htonl(VXLAN_FLAGS);
1746 vxh->vx_vni = vni;
1747
1748 __skb_push(skb, sizeof(*uh));
1749 skb_reset_transport_header(skb);
1750 uh = udp_hdr(skb);
1751
1752 uh->dest = dst_port;
1753 uh->source = src_port;
1754
1755 uh->len = htons(skb->len);
1756 uh->check = 0;
1757
1758 err = handle_offloads(skb);
1759 if (err)
1760 return err;
1761
1762 return iptunnel_xmit(vs->sock->sk, rt, skb, src, dst, IPPROTO_UDP,
1763 tos, ttl, df, false);
1764 }
1765 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1766
1767 /* Bypass encapsulation if the destination is local */
1768 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1769 struct vxlan_dev *dst_vxlan)
1770 {
1771 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1772 union vxlan_addr loopback;
1773 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1774
1775 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1776 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1777 skb->pkt_type = PACKET_HOST;
1778 skb->encapsulation = 0;
1779 skb->dev = dst_vxlan->dev;
1780 __skb_pull(skb, skb_network_offset(skb));
1781
1782 if (remote_ip->sa.sa_family == AF_INET) {
1783 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1784 loopback.sa.sa_family = AF_INET;
1785 #if IS_ENABLED(CONFIG_IPV6)
1786 } else {
1787 loopback.sin6.sin6_addr = in6addr_loopback;
1788 loopback.sa.sa_family = AF_INET6;
1789 #endif
1790 }
1791
1792 if (dst_vxlan->flags & VXLAN_F_LEARN)
1793 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1794
1795 u64_stats_update_begin(&tx_stats->syncp);
1796 tx_stats->tx_packets++;
1797 tx_stats->tx_bytes += skb->len;
1798 u64_stats_update_end(&tx_stats->syncp);
1799
1800 if (netif_rx(skb) == NET_RX_SUCCESS) {
1801 u64_stats_update_begin(&rx_stats->syncp);
1802 rx_stats->rx_packets++;
1803 rx_stats->rx_bytes += skb->len;
1804 u64_stats_update_end(&rx_stats->syncp);
1805 } else {
1806 skb->dev->stats.rx_dropped++;
1807 }
1808 }
1809
1810 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1811 struct vxlan_rdst *rdst, bool did_rsc)
1812 {
1813 struct vxlan_dev *vxlan = netdev_priv(dev);
1814 struct rtable *rt = NULL;
1815 const struct iphdr *old_iph;
1816 struct flowi4 fl4;
1817 union vxlan_addr *dst;
1818 __be16 src_port = 0, dst_port;
1819 u32 vni;
1820 __be16 df = 0;
1821 __u8 tos, ttl;
1822 int err;
1823
1824 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1825 vni = rdst->remote_vni;
1826 dst = &rdst->remote_ip;
1827
1828 if (vxlan_addr_any(dst)) {
1829 if (did_rsc) {
1830 /* short-circuited back to local bridge */
1831 vxlan_encap_bypass(skb, vxlan, vxlan);
1832 return;
1833 }
1834 goto drop;
1835 }
1836
1837 old_iph = ip_hdr(skb);
1838
1839 ttl = vxlan->ttl;
1840 if (!ttl && vxlan_addr_multicast(dst))
1841 ttl = 1;
1842
1843 tos = vxlan->tos;
1844 if (tos == 1)
1845 tos = ip_tunnel_get_dsfield(old_iph, skb);
1846
1847 src_port = vxlan_src_port(vxlan->port_min, vxlan->port_max, skb);
1848
1849 if (dst->sa.sa_family == AF_INET) {
1850 memset(&fl4, 0, sizeof(fl4));
1851 fl4.flowi4_oif = rdst->remote_ifindex;
1852 fl4.flowi4_tos = RT_TOS(tos);
1853 fl4.daddr = dst->sin.sin_addr.s_addr;
1854 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1855
1856 rt = ip_route_output_key(dev_net(dev), &fl4);
1857 if (IS_ERR(rt)) {
1858 netdev_dbg(dev, "no route to %pI4\n",
1859 &dst->sin.sin_addr.s_addr);
1860 dev->stats.tx_carrier_errors++;
1861 goto tx_error;
1862 }
1863
1864 if (rt->dst.dev == dev) {
1865 netdev_dbg(dev, "circular route to %pI4\n",
1866 &dst->sin.sin_addr.s_addr);
1867 dev->stats.collisions++;
1868 goto rt_tx_error;
1869 }
1870
1871 /* Bypass encapsulation if the destination is local */
1872 if (rt->rt_flags & RTCF_LOCAL &&
1873 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1874 struct vxlan_dev *dst_vxlan;
1875
1876 ip_rt_put(rt);
1877 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1878 if (!dst_vxlan)
1879 goto tx_error;
1880 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1881 return;
1882 }
1883
1884 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1885 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1886
1887 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1888 fl4.saddr, dst->sin.sin_addr.s_addr,
1889 tos, ttl, df, src_port, dst_port,
1890 htonl(vni << 8));
1891
1892 if (err < 0)
1893 goto rt_tx_error;
1894 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1895 #if IS_ENABLED(CONFIG_IPV6)
1896 } else {
1897 struct sock *sk = vxlan->vn_sock->sock->sk;
1898 struct dst_entry *ndst;
1899 struct flowi6 fl6;
1900 u32 flags;
1901
1902 memset(&fl6, 0, sizeof(fl6));
1903 fl6.flowi6_oif = rdst->remote_ifindex;
1904 fl6.daddr = dst->sin6.sin6_addr;
1905 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1906 fl6.flowi6_proto = IPPROTO_UDP;
1907
1908 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1909 netdev_dbg(dev, "no route to %pI6\n",
1910 &dst->sin6.sin6_addr);
1911 dev->stats.tx_carrier_errors++;
1912 goto tx_error;
1913 }
1914
1915 if (ndst->dev == dev) {
1916 netdev_dbg(dev, "circular route to %pI6\n",
1917 &dst->sin6.sin6_addr);
1918 dst_release(ndst);
1919 dev->stats.collisions++;
1920 goto tx_error;
1921 }
1922
1923 /* Bypass encapsulation if the destination is local */
1924 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1925 if (flags & RTF_LOCAL &&
1926 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1927 struct vxlan_dev *dst_vxlan;
1928
1929 dst_release(ndst);
1930 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1931 if (!dst_vxlan)
1932 goto tx_error;
1933 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1934 return;
1935 }
1936
1937 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1938
1939 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
1940 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1941 src_port, dst_port, htonl(vni << 8));
1942 #endif
1943 }
1944
1945 return;
1946
1947 drop:
1948 dev->stats.tx_dropped++;
1949 goto tx_free;
1950
1951 rt_tx_error:
1952 ip_rt_put(rt);
1953 tx_error:
1954 dev->stats.tx_errors++;
1955 tx_free:
1956 dev_kfree_skb(skb);
1957 }
1958
1959 /* Transmit local packets over Vxlan
1960 *
1961 * Outer IP header inherits ECN and DF from inner header.
1962 * Outer UDP destination is the VXLAN assigned port.
1963 * source port is based on hash of flow
1964 */
1965 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1966 {
1967 struct vxlan_dev *vxlan = netdev_priv(dev);
1968 struct ethhdr *eth;
1969 bool did_rsc = false;
1970 struct vxlan_rdst *rdst, *fdst = NULL;
1971 struct vxlan_fdb *f;
1972
1973 skb_reset_mac_header(skb);
1974 eth = eth_hdr(skb);
1975
1976 if ((vxlan->flags & VXLAN_F_PROXY)) {
1977 if (ntohs(eth->h_proto) == ETH_P_ARP)
1978 return arp_reduce(dev, skb);
1979 #if IS_ENABLED(CONFIG_IPV6)
1980 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1981 skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
1982 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1983 struct nd_msg *msg;
1984
1985 msg = (struct nd_msg *)skb_transport_header(skb);
1986 if (msg->icmph.icmp6_code == 0 &&
1987 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1988 return neigh_reduce(dev, skb);
1989 }
1990 #endif
1991 }
1992
1993 f = vxlan_find_mac(vxlan, eth->h_dest);
1994 did_rsc = false;
1995
1996 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1997 (ntohs(eth->h_proto) == ETH_P_IP ||
1998 ntohs(eth->h_proto) == ETH_P_IPV6)) {
1999 did_rsc = route_shortcircuit(dev, skb);
2000 if (did_rsc)
2001 f = vxlan_find_mac(vxlan, eth->h_dest);
2002 }
2003
2004 if (f == NULL) {
2005 f = vxlan_find_mac(vxlan, all_zeros_mac);
2006 if (f == NULL) {
2007 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2008 !is_multicast_ether_addr(eth->h_dest))
2009 vxlan_fdb_miss(vxlan, eth->h_dest);
2010
2011 dev->stats.tx_dropped++;
2012 kfree_skb(skb);
2013 return NETDEV_TX_OK;
2014 }
2015 }
2016
2017 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2018 struct sk_buff *skb1;
2019
2020 if (!fdst) {
2021 fdst = rdst;
2022 continue;
2023 }
2024 skb1 = skb_clone(skb, GFP_ATOMIC);
2025 if (skb1)
2026 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2027 }
2028
2029 if (fdst)
2030 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2031 else
2032 kfree_skb(skb);
2033 return NETDEV_TX_OK;
2034 }
2035
2036 /* Walk the forwarding table and purge stale entries */
2037 static void vxlan_cleanup(unsigned long arg)
2038 {
2039 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2040 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2041 unsigned int h;
2042
2043 if (!netif_running(vxlan->dev))
2044 return;
2045
2046 spin_lock_bh(&vxlan->hash_lock);
2047 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2048 struct hlist_node *p, *n;
2049 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2050 struct vxlan_fdb *f
2051 = container_of(p, struct vxlan_fdb, hlist);
2052 unsigned long timeout;
2053
2054 if (f->state & NUD_PERMANENT)
2055 continue;
2056
2057 timeout = f->used + vxlan->age_interval * HZ;
2058 if (time_before_eq(timeout, jiffies)) {
2059 netdev_dbg(vxlan->dev,
2060 "garbage collect %pM\n",
2061 f->eth_addr);
2062 f->state = NUD_STALE;
2063 vxlan_fdb_destroy(vxlan, f);
2064 } else if (time_before(timeout, next_timer))
2065 next_timer = timeout;
2066 }
2067 }
2068 spin_unlock_bh(&vxlan->hash_lock);
2069
2070 mod_timer(&vxlan->age_timer, next_timer);
2071 }
2072
2073 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2074 {
2075 __u32 vni = vxlan->default_dst.remote_vni;
2076
2077 vxlan->vn_sock = vs;
2078 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2079 }
2080
2081 /* Setup stats when device is created */
2082 static int vxlan_init(struct net_device *dev)
2083 {
2084 struct vxlan_dev *vxlan = netdev_priv(dev);
2085 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2086 struct vxlan_sock *vs;
2087
2088 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2089 if (!dev->tstats)
2090 return -ENOMEM;
2091
2092 spin_lock(&vn->sock_lock);
2093 vs = vxlan_find_sock(dev_net(dev), vxlan->dst_port);
2094 if (vs) {
2095 /* If we have a socket with same port already, reuse it */
2096 atomic_inc(&vs->refcnt);
2097 vxlan_vs_add_dev(vs, vxlan);
2098 } else {
2099 /* otherwise make new socket outside of RTNL */
2100 dev_hold(dev);
2101 queue_work(vxlan_wq, &vxlan->sock_work);
2102 }
2103 spin_unlock(&vn->sock_lock);
2104
2105 return 0;
2106 }
2107
2108 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2109 {
2110 struct vxlan_fdb *f;
2111
2112 spin_lock_bh(&vxlan->hash_lock);
2113 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2114 if (f)
2115 vxlan_fdb_destroy(vxlan, f);
2116 spin_unlock_bh(&vxlan->hash_lock);
2117 }
2118
2119 static void vxlan_uninit(struct net_device *dev)
2120 {
2121 struct vxlan_dev *vxlan = netdev_priv(dev);
2122 struct vxlan_sock *vs = vxlan->vn_sock;
2123
2124 vxlan_fdb_delete_default(vxlan);
2125
2126 if (vs)
2127 vxlan_sock_release(vs);
2128 free_percpu(dev->tstats);
2129 }
2130
2131 /* Start ageing timer and join group when device is brought up */
2132 static int vxlan_open(struct net_device *dev)
2133 {
2134 struct vxlan_dev *vxlan = netdev_priv(dev);
2135 struct vxlan_sock *vs = vxlan->vn_sock;
2136
2137 /* socket hasn't been created */
2138 if (!vs)
2139 return -ENOTCONN;
2140
2141 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2142 vxlan_sock_hold(vs);
2143 dev_hold(dev);
2144 queue_work(vxlan_wq, &vxlan->igmp_join);
2145 }
2146
2147 if (vxlan->age_interval)
2148 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2149
2150 return 0;
2151 }
2152
2153 /* Purge the forwarding table */
2154 static void vxlan_flush(struct vxlan_dev *vxlan)
2155 {
2156 unsigned int h;
2157
2158 spin_lock_bh(&vxlan->hash_lock);
2159 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2160 struct hlist_node *p, *n;
2161 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2162 struct vxlan_fdb *f
2163 = container_of(p, struct vxlan_fdb, hlist);
2164 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2165 if (!is_zero_ether_addr(f->eth_addr))
2166 vxlan_fdb_destroy(vxlan, f);
2167 }
2168 }
2169 spin_unlock_bh(&vxlan->hash_lock);
2170 }
2171
2172 /* Cleanup timer and forwarding table on shutdown */
2173 static int vxlan_stop(struct net_device *dev)
2174 {
2175 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2176 struct vxlan_dev *vxlan = netdev_priv(dev);
2177 struct vxlan_sock *vs = vxlan->vn_sock;
2178
2179 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2180 !vxlan_group_used(vn, vxlan)) {
2181 vxlan_sock_hold(vs);
2182 dev_hold(dev);
2183 queue_work(vxlan_wq, &vxlan->igmp_leave);
2184 }
2185
2186 del_timer_sync(&vxlan->age_timer);
2187
2188 vxlan_flush(vxlan);
2189
2190 return 0;
2191 }
2192
2193 /* Stub, nothing needs to be done. */
2194 static void vxlan_set_multicast_list(struct net_device *dev)
2195 {
2196 }
2197
2198 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2199 {
2200 struct vxlan_dev *vxlan = netdev_priv(dev);
2201 struct vxlan_rdst *dst = &vxlan->default_dst;
2202 struct net_device *lowerdev;
2203 int max_mtu;
2204
2205 lowerdev = __dev_get_by_index(dev_net(dev), dst->remote_ifindex);
2206 if (lowerdev == NULL)
2207 return eth_change_mtu(dev, new_mtu);
2208
2209 if (dst->remote_ip.sa.sa_family == AF_INET6)
2210 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2211 else
2212 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2213
2214 if (new_mtu < 68 || new_mtu > max_mtu)
2215 return -EINVAL;
2216
2217 dev->mtu = new_mtu;
2218 return 0;
2219 }
2220
2221 static const struct net_device_ops vxlan_netdev_ops = {
2222 .ndo_init = vxlan_init,
2223 .ndo_uninit = vxlan_uninit,
2224 .ndo_open = vxlan_open,
2225 .ndo_stop = vxlan_stop,
2226 .ndo_start_xmit = vxlan_xmit,
2227 .ndo_get_stats64 = ip_tunnel_get_stats64,
2228 .ndo_set_rx_mode = vxlan_set_multicast_list,
2229 .ndo_change_mtu = vxlan_change_mtu,
2230 .ndo_validate_addr = eth_validate_addr,
2231 .ndo_set_mac_address = eth_mac_addr,
2232 .ndo_fdb_add = vxlan_fdb_add,
2233 .ndo_fdb_del = vxlan_fdb_delete,
2234 .ndo_fdb_dump = vxlan_fdb_dump,
2235 };
2236
2237 /* Info for udev, that this is a virtual tunnel endpoint */
2238 static struct device_type vxlan_type = {
2239 .name = "vxlan",
2240 };
2241
2242 /* Calls the ndo_add_vxlan_port of the caller in order to
2243 * supply the listening VXLAN udp ports. Callers are expected
2244 * to implement the ndo_add_vxlan_port.
2245 */
2246 void vxlan_get_rx_port(struct net_device *dev)
2247 {
2248 struct vxlan_sock *vs;
2249 struct net *net = dev_net(dev);
2250 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2251 sa_family_t sa_family;
2252 __be16 port;
2253 unsigned int i;
2254
2255 spin_lock(&vn->sock_lock);
2256 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2257 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2258 port = inet_sk(vs->sock->sk)->inet_sport;
2259 sa_family = vs->sock->sk->sk_family;
2260 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2261 port);
2262 }
2263 }
2264 spin_unlock(&vn->sock_lock);
2265 }
2266 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2267
2268 /* Initialize the device structure. */
2269 static void vxlan_setup(struct net_device *dev)
2270 {
2271 struct vxlan_dev *vxlan = netdev_priv(dev);
2272 unsigned int h;
2273 int low, high;
2274
2275 eth_hw_addr_random(dev);
2276 ether_setup(dev);
2277 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2278 dev->hard_header_len = ETH_HLEN + VXLAN6_HEADROOM;
2279 else
2280 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
2281
2282 dev->netdev_ops = &vxlan_netdev_ops;
2283 dev->destructor = free_netdev;
2284 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2285
2286 dev->tx_queue_len = 0;
2287 dev->features |= NETIF_F_LLTX;
2288 dev->features |= NETIF_F_NETNS_LOCAL;
2289 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2290 dev->features |= NETIF_F_RXCSUM;
2291 dev->features |= NETIF_F_GSO_SOFTWARE;
2292
2293 dev->vlan_features = dev->features;
2294 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2295 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2296 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2297 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2298 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
2299 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2300
2301 INIT_LIST_HEAD(&vxlan->next);
2302 spin_lock_init(&vxlan->hash_lock);
2303 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2304 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2305 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2306
2307 init_timer_deferrable(&vxlan->age_timer);
2308 vxlan->age_timer.function = vxlan_cleanup;
2309 vxlan->age_timer.data = (unsigned long) vxlan;
2310
2311 inet_get_local_port_range(dev_net(dev), &low, &high);
2312 vxlan->port_min = low;
2313 vxlan->port_max = high;
2314 vxlan->dst_port = htons(vxlan_port);
2315
2316 vxlan->dev = dev;
2317
2318 for (h = 0; h < FDB_HASH_SIZE; ++h)
2319 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2320 }
2321
2322 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2323 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2324 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2325 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2326 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2327 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2328 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2329 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2330 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2331 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2332 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2333 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2334 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2335 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2336 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2337 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2338 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2339 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2340 };
2341
2342 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2343 {
2344 if (tb[IFLA_ADDRESS]) {
2345 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2346 pr_debug("invalid link address (not ethernet)\n");
2347 return -EINVAL;
2348 }
2349
2350 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2351 pr_debug("invalid all zero ethernet address\n");
2352 return -EADDRNOTAVAIL;
2353 }
2354 }
2355
2356 if (!data)
2357 return -EINVAL;
2358
2359 if (data[IFLA_VXLAN_ID]) {
2360 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2361 if (id >= VXLAN_VID_MASK)
2362 return -ERANGE;
2363 }
2364
2365 if (data[IFLA_VXLAN_PORT_RANGE]) {
2366 const struct ifla_vxlan_port_range *p
2367 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2368
2369 if (ntohs(p->high) < ntohs(p->low)) {
2370 pr_debug("port range %u .. %u not valid\n",
2371 ntohs(p->low), ntohs(p->high));
2372 return -EINVAL;
2373 }
2374 }
2375
2376 return 0;
2377 }
2378
2379 static void vxlan_get_drvinfo(struct net_device *netdev,
2380 struct ethtool_drvinfo *drvinfo)
2381 {
2382 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2383 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2384 }
2385
2386 static const struct ethtool_ops vxlan_ethtool_ops = {
2387 .get_drvinfo = vxlan_get_drvinfo,
2388 .get_link = ethtool_op_get_link,
2389 };
2390
2391 static void vxlan_del_work(struct work_struct *work)
2392 {
2393 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2394
2395 sk_release_kernel(vs->sock->sk);
2396 kfree_rcu(vs, rcu);
2397 }
2398
2399 #if IS_ENABLED(CONFIG_IPV6)
2400 /* Create UDP socket for encapsulation receive. AF_INET6 socket
2401 * could be used for both IPv4 and IPv6 communications, but
2402 * users may set bindv6only=1.
2403 */
2404 static struct socket *create_v6_sock(struct net *net, __be16 port)
2405 {
2406 struct sock *sk;
2407 struct socket *sock;
2408 struct sockaddr_in6 vxlan_addr = {
2409 .sin6_family = AF_INET6,
2410 .sin6_port = port,
2411 };
2412 int rc, val = 1;
2413
2414 rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
2415 if (rc < 0) {
2416 pr_debug("UDPv6 socket create failed\n");
2417 return ERR_PTR(rc);
2418 }
2419
2420 /* Put in proper namespace */
2421 sk = sock->sk;
2422 sk_change_net(sk, net);
2423
2424 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
2425 (char *)&val, sizeof(val));
2426 rc = kernel_bind(sock, (struct sockaddr *)&vxlan_addr,
2427 sizeof(struct sockaddr_in6));
2428 if (rc < 0) {
2429 pr_debug("bind for UDPv6 socket %pI6:%u (%d)\n",
2430 &vxlan_addr.sin6_addr, ntohs(vxlan_addr.sin6_port), rc);
2431 sk_release_kernel(sk);
2432 return ERR_PTR(rc);
2433 }
2434 /* At this point, IPv6 module should have been loaded in
2435 * sock_create_kern().
2436 */
2437 BUG_ON(!ipv6_stub);
2438
2439 /* Disable multicast loopback */
2440 inet_sk(sk)->mc_loop = 0;
2441 return sock;
2442 }
2443
2444 #else
2445
2446 static struct socket *create_v6_sock(struct net *net, __be16 port)
2447 {
2448 return ERR_PTR(-EPFNOSUPPORT);
2449 }
2450 #endif
2451
2452 static struct socket *create_v4_sock(struct net *net, __be16 port)
2453 {
2454 struct sock *sk;
2455 struct socket *sock;
2456 struct sockaddr_in vxlan_addr = {
2457 .sin_family = AF_INET,
2458 .sin_addr.s_addr = htonl(INADDR_ANY),
2459 .sin_port = port,
2460 };
2461 int rc;
2462
2463 /* Create UDP socket for encapsulation receive. */
2464 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
2465 if (rc < 0) {
2466 pr_debug("UDP socket create failed\n");
2467 return ERR_PTR(rc);
2468 }
2469
2470 /* Put in proper namespace */
2471 sk = sock->sk;
2472 sk_change_net(sk, net);
2473
2474 rc = kernel_bind(sock, (struct sockaddr *) &vxlan_addr,
2475 sizeof(vxlan_addr));
2476 if (rc < 0) {
2477 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
2478 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
2479 sk_release_kernel(sk);
2480 return ERR_PTR(rc);
2481 }
2482
2483 /* Disable multicast loopback */
2484 inet_sk(sk)->mc_loop = 0;
2485 return sock;
2486 }
2487
2488 /* Create new listen socket if needed */
2489 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2490 vxlan_rcv_t *rcv, void *data, bool ipv6)
2491 {
2492 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2493 struct vxlan_sock *vs;
2494 struct socket *sock;
2495 struct sock *sk;
2496 unsigned int h;
2497
2498 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2499 if (!vs)
2500 return ERR_PTR(-ENOMEM);
2501
2502 for (h = 0; h < VNI_HASH_SIZE; ++h)
2503 INIT_HLIST_HEAD(&vs->vni_list[h]);
2504
2505 INIT_WORK(&vs->del_work, vxlan_del_work);
2506
2507 if (ipv6)
2508 sock = create_v6_sock(net, port);
2509 else
2510 sock = create_v4_sock(net, port);
2511 if (IS_ERR(sock)) {
2512 kfree(vs);
2513 return ERR_CAST(sock);
2514 }
2515
2516 vs->sock = sock;
2517 sk = sock->sk;
2518 atomic_set(&vs->refcnt, 1);
2519 vs->rcv = rcv;
2520 vs->data = data;
2521 rcu_assign_sk_user_data(vs->sock->sk, vs);
2522
2523 /* Initialize the vxlan udp offloads structure */
2524 vs->udp_offloads.port = port;
2525 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2526 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2527
2528 spin_lock(&vn->sock_lock);
2529 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2530 vxlan_notify_add_rx_port(vs);
2531 spin_unlock(&vn->sock_lock);
2532
2533 /* Mark socket as an encapsulation socket. */
2534 udp_sk(sk)->encap_type = 1;
2535 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
2536 #if IS_ENABLED(CONFIG_IPV6)
2537 if (ipv6)
2538 ipv6_stub->udpv6_encap_enable();
2539 else
2540 #endif
2541 udp_encap_enable();
2542
2543 return vs;
2544 }
2545
2546 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2547 vxlan_rcv_t *rcv, void *data,
2548 bool no_share, bool ipv6)
2549 {
2550 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2551 struct vxlan_sock *vs;
2552
2553 vs = vxlan_socket_create(net, port, rcv, data, ipv6);
2554 if (!IS_ERR(vs))
2555 return vs;
2556
2557 if (no_share) /* Return error if sharing is not allowed. */
2558 return vs;
2559
2560 spin_lock(&vn->sock_lock);
2561 vs = vxlan_find_sock(net, port);
2562 if (vs) {
2563 if (vs->rcv == rcv)
2564 atomic_inc(&vs->refcnt);
2565 else
2566 vs = ERR_PTR(-EBUSY);
2567 }
2568 spin_unlock(&vn->sock_lock);
2569
2570 if (!vs)
2571 vs = ERR_PTR(-EINVAL);
2572
2573 return vs;
2574 }
2575 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2576
2577 /* Scheduled at device creation to bind to a socket */
2578 static void vxlan_sock_work(struct work_struct *work)
2579 {
2580 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2581 struct net *net = dev_net(vxlan->dev);
2582 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2583 __be16 port = vxlan->dst_port;
2584 struct vxlan_sock *nvs;
2585
2586 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags & VXLAN_F_IPV6);
2587 spin_lock(&vn->sock_lock);
2588 if (!IS_ERR(nvs))
2589 vxlan_vs_add_dev(nvs, vxlan);
2590 spin_unlock(&vn->sock_lock);
2591
2592 dev_put(vxlan->dev);
2593 }
2594
2595 static int vxlan_newlink(struct net *net, struct net_device *dev,
2596 struct nlattr *tb[], struct nlattr *data[])
2597 {
2598 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2599 struct vxlan_dev *vxlan = netdev_priv(dev);
2600 struct vxlan_rdst *dst = &vxlan->default_dst;
2601 __u32 vni;
2602 int err;
2603 bool use_ipv6 = false;
2604
2605 if (!data[IFLA_VXLAN_ID])
2606 return -EINVAL;
2607
2608 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2609 dst->remote_vni = vni;
2610
2611 /* Unless IPv6 is explicitly requested, assume IPv4 */
2612 dst->remote_ip.sa.sa_family = AF_INET;
2613 if (data[IFLA_VXLAN_GROUP]) {
2614 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2615 } else if (data[IFLA_VXLAN_GROUP6]) {
2616 if (!IS_ENABLED(CONFIG_IPV6))
2617 return -EPFNOSUPPORT;
2618
2619 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2620 sizeof(struct in6_addr));
2621 dst->remote_ip.sa.sa_family = AF_INET6;
2622 use_ipv6 = true;
2623 }
2624
2625 if (data[IFLA_VXLAN_LOCAL]) {
2626 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2627 vxlan->saddr.sa.sa_family = AF_INET;
2628 } else if (data[IFLA_VXLAN_LOCAL6]) {
2629 if (!IS_ENABLED(CONFIG_IPV6))
2630 return -EPFNOSUPPORT;
2631
2632 /* TODO: respect scope id */
2633 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2634 sizeof(struct in6_addr));
2635 vxlan->saddr.sa.sa_family = AF_INET6;
2636 use_ipv6 = true;
2637 }
2638
2639 if (data[IFLA_VXLAN_LINK] &&
2640 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2641 struct net_device *lowerdev
2642 = __dev_get_by_index(net, dst->remote_ifindex);
2643
2644 if (!lowerdev) {
2645 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2646 return -ENODEV;
2647 }
2648
2649 #if IS_ENABLED(CONFIG_IPV6)
2650 if (use_ipv6) {
2651 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2652 if (idev && idev->cnf.disable_ipv6) {
2653 pr_info("IPv6 is disabled via sysctl\n");
2654 return -EPERM;
2655 }
2656 vxlan->flags |= VXLAN_F_IPV6;
2657 }
2658 #endif
2659
2660 if (!tb[IFLA_MTU])
2661 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2662
2663 /* update header length based on lower device */
2664 dev->hard_header_len = lowerdev->hard_header_len +
2665 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2666 } else if (use_ipv6)
2667 vxlan->flags |= VXLAN_F_IPV6;
2668
2669 if (data[IFLA_VXLAN_TOS])
2670 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2671
2672 if (data[IFLA_VXLAN_TTL])
2673 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2674
2675 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2676 vxlan->flags |= VXLAN_F_LEARN;
2677
2678 if (data[IFLA_VXLAN_AGEING])
2679 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2680 else
2681 vxlan->age_interval = FDB_AGE_DEFAULT;
2682
2683 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2684 vxlan->flags |= VXLAN_F_PROXY;
2685
2686 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2687 vxlan->flags |= VXLAN_F_RSC;
2688
2689 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2690 vxlan->flags |= VXLAN_F_L2MISS;
2691
2692 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2693 vxlan->flags |= VXLAN_F_L3MISS;
2694
2695 if (data[IFLA_VXLAN_LIMIT])
2696 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2697
2698 if (data[IFLA_VXLAN_PORT_RANGE]) {
2699 const struct ifla_vxlan_port_range *p
2700 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2701 vxlan->port_min = ntohs(p->low);
2702 vxlan->port_max = ntohs(p->high);
2703 }
2704
2705 if (data[IFLA_VXLAN_PORT])
2706 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2707
2708 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
2709 pr_info("duplicate VNI %u\n", vni);
2710 return -EEXIST;
2711 }
2712
2713 SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
2714
2715 /* create an fdb entry for a valid default destination */
2716 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2717 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2718 &vxlan->default_dst.remote_ip,
2719 NUD_REACHABLE|NUD_PERMANENT,
2720 NLM_F_EXCL|NLM_F_CREATE,
2721 vxlan->dst_port,
2722 vxlan->default_dst.remote_vni,
2723 vxlan->default_dst.remote_ifindex,
2724 NTF_SELF);
2725 if (err)
2726 return err;
2727 }
2728
2729 err = register_netdevice(dev);
2730 if (err) {
2731 vxlan_fdb_delete_default(vxlan);
2732 return err;
2733 }
2734
2735 list_add(&vxlan->next, &vn->vxlan_list);
2736
2737 return 0;
2738 }
2739
2740 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2741 {
2742 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2743 struct vxlan_dev *vxlan = netdev_priv(dev);
2744
2745 spin_lock(&vn->sock_lock);
2746 if (!hlist_unhashed(&vxlan->hlist))
2747 hlist_del_rcu(&vxlan->hlist);
2748 spin_unlock(&vn->sock_lock);
2749
2750 list_del(&vxlan->next);
2751 unregister_netdevice_queue(dev, head);
2752 }
2753
2754 static size_t vxlan_get_size(const struct net_device *dev)
2755 {
2756
2757 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2758 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2759 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2760 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2761 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2762 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2763 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2764 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2765 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2766 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2767 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2768 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2769 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2770 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2771 nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
2772 0;
2773 }
2774
2775 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2776 {
2777 const struct vxlan_dev *vxlan = netdev_priv(dev);
2778 const struct vxlan_rdst *dst = &vxlan->default_dst;
2779 struct ifla_vxlan_port_range ports = {
2780 .low = htons(vxlan->port_min),
2781 .high = htons(vxlan->port_max),
2782 };
2783
2784 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2785 goto nla_put_failure;
2786
2787 if (!vxlan_addr_any(&dst->remote_ip)) {
2788 if (dst->remote_ip.sa.sa_family == AF_INET) {
2789 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2790 dst->remote_ip.sin.sin_addr.s_addr))
2791 goto nla_put_failure;
2792 #if IS_ENABLED(CONFIG_IPV6)
2793 } else {
2794 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2795 &dst->remote_ip.sin6.sin6_addr))
2796 goto nla_put_failure;
2797 #endif
2798 }
2799 }
2800
2801 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2802 goto nla_put_failure;
2803
2804 if (!vxlan_addr_any(&vxlan->saddr)) {
2805 if (vxlan->saddr.sa.sa_family == AF_INET) {
2806 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2807 vxlan->saddr.sin.sin_addr.s_addr))
2808 goto nla_put_failure;
2809 #if IS_ENABLED(CONFIG_IPV6)
2810 } else {
2811 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2812 &vxlan->saddr.sin6.sin6_addr))
2813 goto nla_put_failure;
2814 #endif
2815 }
2816 }
2817
2818 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2819 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2820 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2821 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2822 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2823 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2824 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2825 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2826 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2827 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2828 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2829 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2830 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2831 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
2832 goto nla_put_failure;
2833
2834 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2835 goto nla_put_failure;
2836
2837 return 0;
2838
2839 nla_put_failure:
2840 return -EMSGSIZE;
2841 }
2842
2843 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2844 .kind = "vxlan",
2845 .maxtype = IFLA_VXLAN_MAX,
2846 .policy = vxlan_policy,
2847 .priv_size = sizeof(struct vxlan_dev),
2848 .setup = vxlan_setup,
2849 .validate = vxlan_validate,
2850 .newlink = vxlan_newlink,
2851 .dellink = vxlan_dellink,
2852 .get_size = vxlan_get_size,
2853 .fill_info = vxlan_fill_info,
2854 };
2855
2856 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2857 struct net_device *dev)
2858 {
2859 struct vxlan_dev *vxlan, *next;
2860 LIST_HEAD(list_kill);
2861
2862 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2863 struct vxlan_rdst *dst = &vxlan->default_dst;
2864
2865 /* In case we created vxlan device with carrier
2866 * and we loose the carrier due to module unload
2867 * we also need to remove vxlan device. In other
2868 * cases, it's not necessary and remote_ifindex
2869 * is 0 here, so no matches.
2870 */
2871 if (dst->remote_ifindex == dev->ifindex)
2872 vxlan_dellink(vxlan->dev, &list_kill);
2873 }
2874
2875 unregister_netdevice_many(&list_kill);
2876 }
2877
2878 static int vxlan_lowerdev_event(struct notifier_block *unused,
2879 unsigned long event, void *ptr)
2880 {
2881 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2882 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2883
2884 if (event == NETDEV_UNREGISTER)
2885 vxlan_handle_lowerdev_unregister(vn, dev);
2886
2887 return NOTIFY_DONE;
2888 }
2889
2890 static struct notifier_block vxlan_notifier_block __read_mostly = {
2891 .notifier_call = vxlan_lowerdev_event,
2892 };
2893
2894 static __net_init int vxlan_init_net(struct net *net)
2895 {
2896 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2897 unsigned int h;
2898
2899 INIT_LIST_HEAD(&vn->vxlan_list);
2900 spin_lock_init(&vn->sock_lock);
2901
2902 for (h = 0; h < PORT_HASH_SIZE; ++h)
2903 INIT_HLIST_HEAD(&vn->sock_list[h]);
2904
2905 return 0;
2906 }
2907
2908 static struct pernet_operations vxlan_net_ops = {
2909 .init = vxlan_init_net,
2910 .id = &vxlan_net_id,
2911 .size = sizeof(struct vxlan_net),
2912 };
2913
2914 static int __init vxlan_init_module(void)
2915 {
2916 int rc;
2917
2918 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2919 if (!vxlan_wq)
2920 return -ENOMEM;
2921
2922 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2923
2924 rc = register_pernet_subsys(&vxlan_net_ops);
2925 if (rc)
2926 goto out1;
2927
2928 rc = register_netdevice_notifier(&vxlan_notifier_block);
2929 if (rc)
2930 goto out2;
2931
2932 rc = rtnl_link_register(&vxlan_link_ops);
2933 if (rc)
2934 goto out3;
2935
2936 return 0;
2937 out3:
2938 unregister_netdevice_notifier(&vxlan_notifier_block);
2939 out2:
2940 unregister_pernet_subsys(&vxlan_net_ops);
2941 out1:
2942 destroy_workqueue(vxlan_wq);
2943 return rc;
2944 }
2945 late_initcall(vxlan_init_module);
2946
2947 static void __exit vxlan_cleanup_module(void)
2948 {
2949 rtnl_link_unregister(&vxlan_link_ops);
2950 unregister_netdevice_notifier(&vxlan_notifier_block);
2951 destroy_workqueue(vxlan_wq);
2952 unregister_pernet_subsys(&vxlan_net_ops);
2953 /* rcu_barrier() is called by netns */
2954 }
2955 module_exit(vxlan_cleanup_module);
2956
2957 MODULE_LICENSE("GPL");
2958 MODULE_VERSION(VXLAN_VERSION);
2959 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
2960 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
2961 MODULE_ALIAS_RTNL_LINK("vxlan");
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