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cxgb3: re-use native hex2bin()
[deliverable/linux.git] / drivers / net / vxlan.c
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/rculist.h>
20 #include <linux/netdevice.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/udp.h>
24 #include <linux/igmp.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/hash.h>
29 #include <linux/ethtool.h>
30 #include <net/arp.h>
31 #include <net/ndisc.h>
32 #include <net/ip.h>
33 #include <net/ip_tunnels.h>
34 #include <net/icmp.h>
35 #include <net/udp.h>
36 #include <net/udp_tunnel.h>
37 #include <net/rtnetlink.h>
38 #include <net/route.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/vxlan.h>
44 #include <net/protocol.h>
45 #include <net/udp_tunnel.h>
46 #if IS_ENABLED(CONFIG_IPV6)
47 #include <net/ipv6.h>
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/ip6_checksum.h>
51 #endif
52
53 #define VXLAN_VERSION "0.1"
54
55 #define PORT_HASH_BITS 8
56 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
57 #define VNI_HASH_BITS 10
58 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
59 #define FDB_HASH_BITS 8
60 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
61 #define FDB_AGE_DEFAULT 300 /* 5 min */
62 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
63
64 /* UDP port for VXLAN traffic.
65 * The IANA assigned port is 4789, but the Linux default is 8472
66 * for compatibility with early adopters.
67 */
68 static unsigned short vxlan_port __read_mostly = 8472;
69 module_param_named(udp_port, vxlan_port, ushort, 0444);
70 MODULE_PARM_DESC(udp_port, "Destination UDP port");
71
72 static bool log_ecn_error = true;
73 module_param(log_ecn_error, bool, 0644);
74 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
75
76 static int vxlan_net_id;
77
78 static const u8 all_zeros_mac[ETH_ALEN];
79
80 /* per-network namespace private data for this module */
81 struct vxlan_net {
82 struct list_head vxlan_list;
83 struct hlist_head sock_list[PORT_HASH_SIZE];
84 spinlock_t sock_lock;
85 };
86
87 union vxlan_addr {
88 struct sockaddr_in sin;
89 struct sockaddr_in6 sin6;
90 struct sockaddr sa;
91 };
92
93 struct vxlan_rdst {
94 union vxlan_addr remote_ip;
95 __be16 remote_port;
96 u32 remote_vni;
97 u32 remote_ifindex;
98 struct list_head list;
99 struct rcu_head rcu;
100 };
101
102 /* Forwarding table entry */
103 struct vxlan_fdb {
104 struct hlist_node hlist; /* linked list of entries */
105 struct rcu_head rcu;
106 unsigned long updated; /* jiffies */
107 unsigned long used;
108 struct list_head remotes;
109 u16 state; /* see ndm_state */
110 u8 flags; /* see ndm_flags */
111 u8 eth_addr[ETH_ALEN];
112 };
113
114 /* Pseudo network device */
115 struct vxlan_dev {
116 struct hlist_node hlist; /* vni hash table */
117 struct list_head next; /* vxlan's per namespace list */
118 struct vxlan_sock *vn_sock; /* listening socket */
119 struct net_device *dev;
120 struct net *net; /* netns for packet i/o */
121 struct vxlan_rdst default_dst; /* default destination */
122 union vxlan_addr saddr; /* source address */
123 __be16 dst_port;
124 __u16 port_min; /* source port range */
125 __u16 port_max;
126 __u8 tos; /* TOS override */
127 __u8 ttl;
128 u32 flags; /* VXLAN_F_* in vxlan.h */
129
130 struct work_struct sock_work;
131 struct work_struct igmp_join;
132 struct work_struct igmp_leave;
133
134 unsigned long age_interval;
135 struct timer_list age_timer;
136 spinlock_t hash_lock;
137 unsigned int addrcnt;
138 unsigned int addrmax;
139
140 struct hlist_head fdb_head[FDB_HASH_SIZE];
141 };
142
143 /* salt for hash table */
144 static u32 vxlan_salt __read_mostly;
145 static struct workqueue_struct *vxlan_wq;
146
147 static void vxlan_sock_work(struct work_struct *work);
148
149 #if IS_ENABLED(CONFIG_IPV6)
150 static inline
151 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
152 {
153 if (a->sa.sa_family != b->sa.sa_family)
154 return false;
155 if (a->sa.sa_family == AF_INET6)
156 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
157 else
158 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
159 }
160
161 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
162 {
163 if (ipa->sa.sa_family == AF_INET6)
164 return ipv6_addr_any(&ipa->sin6.sin6_addr);
165 else
166 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
167 }
168
169 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
170 {
171 if (ipa->sa.sa_family == AF_INET6)
172 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
173 else
174 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
175 }
176
177 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
178 {
179 if (nla_len(nla) >= sizeof(struct in6_addr)) {
180 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
181 ip->sa.sa_family = AF_INET6;
182 return 0;
183 } else if (nla_len(nla) >= sizeof(__be32)) {
184 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
185 ip->sa.sa_family = AF_INET;
186 return 0;
187 } else {
188 return -EAFNOSUPPORT;
189 }
190 }
191
192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
193 const union vxlan_addr *ip)
194 {
195 if (ip->sa.sa_family == AF_INET6)
196 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
197 else
198 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
199 }
200
201 #else /* !CONFIG_IPV6 */
202
203 static inline
204 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
205 {
206 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
207 }
208
209 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
210 {
211 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
212 }
213
214 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
215 {
216 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
217 }
218
219 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
220 {
221 if (nla_len(nla) >= sizeof(struct in6_addr)) {
222 return -EAFNOSUPPORT;
223 } else if (nla_len(nla) >= sizeof(__be32)) {
224 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
225 ip->sa.sa_family = AF_INET;
226 return 0;
227 } else {
228 return -EAFNOSUPPORT;
229 }
230 }
231
232 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
233 const union vxlan_addr *ip)
234 {
235 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
236 }
237 #endif
238
239 /* Virtual Network hash table head */
240 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
241 {
242 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
243 }
244
245 /* Socket hash table head */
246 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
247 {
248 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
249
250 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
251 }
252
253 /* First remote destination for a forwarding entry.
254 * Guaranteed to be non-NULL because remotes are never deleted.
255 */
256 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
257 {
258 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
259 }
260
261 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
262 {
263 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
264 }
265
266 /* Find VXLAN socket based on network namespace, address family and UDP port
267 * and enabled unshareable flags.
268 */
269 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
270 __be16 port, u32 flags)
271 {
272 struct vxlan_sock *vs;
273
274 flags &= VXLAN_F_RCV_FLAGS;
275
276 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
277 if (inet_sk(vs->sock->sk)->inet_sport == port &&
278 inet_sk(vs->sock->sk)->sk.sk_family == family &&
279 vs->flags == flags)
280 return vs;
281 }
282 return NULL;
283 }
284
285 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
286 {
287 struct vxlan_dev *vxlan;
288
289 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
290 if (vxlan->default_dst.remote_vni == id)
291 return vxlan;
292 }
293
294 return NULL;
295 }
296
297 /* Look up VNI in a per net namespace table */
298 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
299 sa_family_t family, __be16 port,
300 u32 flags)
301 {
302 struct vxlan_sock *vs;
303
304 vs = vxlan_find_sock(net, family, port, flags);
305 if (!vs)
306 return NULL;
307
308 return vxlan_vs_find_vni(vs, id);
309 }
310
311 /* Fill in neighbour message in skbuff. */
312 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
313 const struct vxlan_fdb *fdb,
314 u32 portid, u32 seq, int type, unsigned int flags,
315 const struct vxlan_rdst *rdst)
316 {
317 unsigned long now = jiffies;
318 struct nda_cacheinfo ci;
319 struct nlmsghdr *nlh;
320 struct ndmsg *ndm;
321 bool send_ip, send_eth;
322
323 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
324 if (nlh == NULL)
325 return -EMSGSIZE;
326
327 ndm = nlmsg_data(nlh);
328 memset(ndm, 0, sizeof(*ndm));
329
330 send_eth = send_ip = true;
331
332 if (type == RTM_GETNEIGH) {
333 ndm->ndm_family = AF_INET;
334 send_ip = !vxlan_addr_any(&rdst->remote_ip);
335 send_eth = !is_zero_ether_addr(fdb->eth_addr);
336 } else
337 ndm->ndm_family = AF_BRIDGE;
338 ndm->ndm_state = fdb->state;
339 ndm->ndm_ifindex = vxlan->dev->ifindex;
340 ndm->ndm_flags = fdb->flags;
341 ndm->ndm_type = RTN_UNICAST;
342
343 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
344 nla_put_s32(skb, NDA_NDM_IFINDEX_NETNSID,
345 peernet2id(vxlan->net, dev_net(vxlan->dev))))
346 goto nla_put_failure;
347
348 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
349 goto nla_put_failure;
350
351 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
352 goto nla_put_failure;
353
354 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
355 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
356 goto nla_put_failure;
357 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
358 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
359 goto nla_put_failure;
360 if (rdst->remote_ifindex &&
361 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
362 goto nla_put_failure;
363
364 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
365 ci.ndm_confirmed = 0;
366 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
367 ci.ndm_refcnt = 0;
368
369 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
370 goto nla_put_failure;
371
372 nlmsg_end(skb, nlh);
373 return 0;
374
375 nla_put_failure:
376 nlmsg_cancel(skb, nlh);
377 return -EMSGSIZE;
378 }
379
380 static inline size_t vxlan_nlmsg_size(void)
381 {
382 return NLMSG_ALIGN(sizeof(struct ndmsg))
383 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
384 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
385 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
386 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
387 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
388 + nla_total_size(sizeof(struct nda_cacheinfo));
389 }
390
391 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
392 struct vxlan_rdst *rd, int type)
393 {
394 struct net *net = dev_net(vxlan->dev);
395 struct sk_buff *skb;
396 int err = -ENOBUFS;
397
398 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
399 if (skb == NULL)
400 goto errout;
401
402 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
403 if (err < 0) {
404 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
405 WARN_ON(err == -EMSGSIZE);
406 kfree_skb(skb);
407 goto errout;
408 }
409
410 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
411 return;
412 errout:
413 if (err < 0)
414 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
415 }
416
417 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
418 {
419 struct vxlan_dev *vxlan = netdev_priv(dev);
420 struct vxlan_fdb f = {
421 .state = NUD_STALE,
422 };
423 struct vxlan_rdst remote = {
424 .remote_ip = *ipa, /* goes to NDA_DST */
425 .remote_vni = VXLAN_N_VID,
426 };
427
428 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
429 }
430
431 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
432 {
433 struct vxlan_fdb f = {
434 .state = NUD_STALE,
435 };
436 struct vxlan_rdst remote = { };
437
438 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
439
440 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
441 }
442
443 /* Hash Ethernet address */
444 static u32 eth_hash(const unsigned char *addr)
445 {
446 u64 value = get_unaligned((u64 *)addr);
447
448 /* only want 6 bytes */
449 #ifdef __BIG_ENDIAN
450 value >>= 16;
451 #else
452 value <<= 16;
453 #endif
454 return hash_64(value, FDB_HASH_BITS);
455 }
456
457 /* Hash chain to use given mac address */
458 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
459 const u8 *mac)
460 {
461 return &vxlan->fdb_head[eth_hash(mac)];
462 }
463
464 /* Look up Ethernet address in forwarding table */
465 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
466 const u8 *mac)
467 {
468 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
469 struct vxlan_fdb *f;
470
471 hlist_for_each_entry_rcu(f, head, hlist) {
472 if (ether_addr_equal(mac, f->eth_addr))
473 return f;
474 }
475
476 return NULL;
477 }
478
479 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
480 const u8 *mac)
481 {
482 struct vxlan_fdb *f;
483
484 f = __vxlan_find_mac(vxlan, mac);
485 if (f)
486 f->used = jiffies;
487
488 return f;
489 }
490
491 /* caller should hold vxlan->hash_lock */
492 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
493 union vxlan_addr *ip, __be16 port,
494 __u32 vni, __u32 ifindex)
495 {
496 struct vxlan_rdst *rd;
497
498 list_for_each_entry(rd, &f->remotes, list) {
499 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
500 rd->remote_port == port &&
501 rd->remote_vni == vni &&
502 rd->remote_ifindex == ifindex)
503 return rd;
504 }
505
506 return NULL;
507 }
508
509 /* Replace destination of unicast mac */
510 static int vxlan_fdb_replace(struct vxlan_fdb *f,
511 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
512 {
513 struct vxlan_rdst *rd;
514
515 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
516 if (rd)
517 return 0;
518
519 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
520 if (!rd)
521 return 0;
522 rd->remote_ip = *ip;
523 rd->remote_port = port;
524 rd->remote_vni = vni;
525 rd->remote_ifindex = ifindex;
526 return 1;
527 }
528
529 /* Add/update destinations for multicast */
530 static int vxlan_fdb_append(struct vxlan_fdb *f,
531 union vxlan_addr *ip, __be16 port, __u32 vni,
532 __u32 ifindex, struct vxlan_rdst **rdp)
533 {
534 struct vxlan_rdst *rd;
535
536 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
537 if (rd)
538 return 0;
539
540 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
541 if (rd == NULL)
542 return -ENOBUFS;
543 rd->remote_ip = *ip;
544 rd->remote_port = port;
545 rd->remote_vni = vni;
546 rd->remote_ifindex = ifindex;
547
548 list_add_tail_rcu(&rd->list, &f->remotes);
549
550 *rdp = rd;
551 return 1;
552 }
553
554 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
555 unsigned int off,
556 struct vxlanhdr *vh, size_t hdrlen,
557 u32 data)
558 {
559 size_t start, offset, plen;
560 __wsum delta;
561
562 if (skb->remcsum_offload)
563 return vh;
564
565 if (!NAPI_GRO_CB(skb)->csum_valid)
566 return NULL;
567
568 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
569 offset = start + ((data & VXLAN_RCO_UDP) ?
570 offsetof(struct udphdr, check) :
571 offsetof(struct tcphdr, check));
572
573 plen = hdrlen + offset + sizeof(u16);
574
575 /* Pull checksum that will be written */
576 if (skb_gro_header_hard(skb, off + plen)) {
577 vh = skb_gro_header_slow(skb, off + plen, off);
578 if (!vh)
579 return NULL;
580 }
581
582 delta = remcsum_adjust((void *)vh + hdrlen,
583 NAPI_GRO_CB(skb)->csum, start, offset);
584
585 /* Adjust skb->csum since we changed the packet */
586 skb->csum = csum_add(skb->csum, delta);
587 NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta);
588
589 skb->remcsum_offload = 1;
590
591 return vh;
592 }
593
594 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
595 struct sk_buff *skb,
596 struct udp_offload *uoff)
597 {
598 struct sk_buff *p, **pp = NULL;
599 struct vxlanhdr *vh, *vh2;
600 unsigned int hlen, off_vx;
601 int flush = 1;
602 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
603 udp_offloads);
604 u32 flags;
605
606 off_vx = skb_gro_offset(skb);
607 hlen = off_vx + sizeof(*vh);
608 vh = skb_gro_header_fast(skb, off_vx);
609 if (skb_gro_header_hard(skb, hlen)) {
610 vh = skb_gro_header_slow(skb, hlen, off_vx);
611 if (unlikely(!vh))
612 goto out;
613 }
614
615 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
616 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
617
618 flags = ntohl(vh->vx_flags);
619
620 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
621 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
622 ntohl(vh->vx_vni));
623
624 if (!vh)
625 goto out;
626 }
627
628 flush = 0;
629
630 for (p = *head; p; p = p->next) {
631 if (!NAPI_GRO_CB(p)->same_flow)
632 continue;
633
634 vh2 = (struct vxlanhdr *)(p->data + off_vx);
635 if (vh->vx_flags != vh2->vx_flags ||
636 vh->vx_vni != vh2->vx_vni) {
637 NAPI_GRO_CB(p)->same_flow = 0;
638 continue;
639 }
640 }
641
642 pp = eth_gro_receive(head, skb);
643
644 out:
645 NAPI_GRO_CB(skb)->flush |= flush;
646
647 return pp;
648 }
649
650 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
651 struct udp_offload *uoff)
652 {
653 udp_tunnel_gro_complete(skb, nhoff);
654
655 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
656 }
657
658 /* Notify netdevs that UDP port started listening */
659 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
660 {
661 struct net_device *dev;
662 struct sock *sk = vs->sock->sk;
663 struct net *net = sock_net(sk);
664 sa_family_t sa_family = sk->sk_family;
665 __be16 port = inet_sk(sk)->inet_sport;
666 int err;
667
668 if (sa_family == AF_INET) {
669 err = udp_add_offload(&vs->udp_offloads);
670 if (err)
671 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
672 }
673
674 rcu_read_lock();
675 for_each_netdev_rcu(net, dev) {
676 if (dev->netdev_ops->ndo_add_vxlan_port)
677 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
678 port);
679 }
680 rcu_read_unlock();
681 }
682
683 /* Notify netdevs that UDP port is no more listening */
684 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
685 {
686 struct net_device *dev;
687 struct sock *sk = vs->sock->sk;
688 struct net *net = sock_net(sk);
689 sa_family_t sa_family = sk->sk_family;
690 __be16 port = inet_sk(sk)->inet_sport;
691
692 rcu_read_lock();
693 for_each_netdev_rcu(net, dev) {
694 if (dev->netdev_ops->ndo_del_vxlan_port)
695 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
696 port);
697 }
698 rcu_read_unlock();
699
700 if (sa_family == AF_INET)
701 udp_del_offload(&vs->udp_offloads);
702 }
703
704 /* Add new entry to forwarding table -- assumes lock held */
705 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
706 const u8 *mac, union vxlan_addr *ip,
707 __u16 state, __u16 flags,
708 __be16 port, __u32 vni, __u32 ifindex,
709 __u8 ndm_flags)
710 {
711 struct vxlan_rdst *rd = NULL;
712 struct vxlan_fdb *f;
713 int notify = 0;
714
715 f = __vxlan_find_mac(vxlan, mac);
716 if (f) {
717 if (flags & NLM_F_EXCL) {
718 netdev_dbg(vxlan->dev,
719 "lost race to create %pM\n", mac);
720 return -EEXIST;
721 }
722 if (f->state != state) {
723 f->state = state;
724 f->updated = jiffies;
725 notify = 1;
726 }
727 if (f->flags != ndm_flags) {
728 f->flags = ndm_flags;
729 f->updated = jiffies;
730 notify = 1;
731 }
732 if ((flags & NLM_F_REPLACE)) {
733 /* Only change unicasts */
734 if (!(is_multicast_ether_addr(f->eth_addr) ||
735 is_zero_ether_addr(f->eth_addr))) {
736 int rc = vxlan_fdb_replace(f, ip, port, vni,
737 ifindex);
738
739 if (rc < 0)
740 return rc;
741 notify |= rc;
742 } else
743 return -EOPNOTSUPP;
744 }
745 if ((flags & NLM_F_APPEND) &&
746 (is_multicast_ether_addr(f->eth_addr) ||
747 is_zero_ether_addr(f->eth_addr))) {
748 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
749 &rd);
750
751 if (rc < 0)
752 return rc;
753 notify |= rc;
754 }
755 } else {
756 if (!(flags & NLM_F_CREATE))
757 return -ENOENT;
758
759 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
760 return -ENOSPC;
761
762 /* Disallow replace to add a multicast entry */
763 if ((flags & NLM_F_REPLACE) &&
764 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
765 return -EOPNOTSUPP;
766
767 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
768 f = kmalloc(sizeof(*f), GFP_ATOMIC);
769 if (!f)
770 return -ENOMEM;
771
772 notify = 1;
773 f->state = state;
774 f->flags = ndm_flags;
775 f->updated = f->used = jiffies;
776 INIT_LIST_HEAD(&f->remotes);
777 memcpy(f->eth_addr, mac, ETH_ALEN);
778
779 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
780
781 ++vxlan->addrcnt;
782 hlist_add_head_rcu(&f->hlist,
783 vxlan_fdb_head(vxlan, mac));
784 }
785
786 if (notify) {
787 if (rd == NULL)
788 rd = first_remote_rtnl(f);
789 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
790 }
791
792 return 0;
793 }
794
795 static void vxlan_fdb_free(struct rcu_head *head)
796 {
797 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
798 struct vxlan_rdst *rd, *nd;
799
800 list_for_each_entry_safe(rd, nd, &f->remotes, list)
801 kfree(rd);
802 kfree(f);
803 }
804
805 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
806 {
807 netdev_dbg(vxlan->dev,
808 "delete %pM\n", f->eth_addr);
809
810 --vxlan->addrcnt;
811 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
812
813 hlist_del_rcu(&f->hlist);
814 call_rcu(&f->rcu, vxlan_fdb_free);
815 }
816
817 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
818 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
819 {
820 struct net *net = dev_net(vxlan->dev);
821 int err;
822
823 if (tb[NDA_DST]) {
824 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
825 if (err)
826 return err;
827 } else {
828 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
829 if (remote->sa.sa_family == AF_INET) {
830 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
831 ip->sa.sa_family = AF_INET;
832 #if IS_ENABLED(CONFIG_IPV6)
833 } else {
834 ip->sin6.sin6_addr = in6addr_any;
835 ip->sa.sa_family = AF_INET6;
836 #endif
837 }
838 }
839
840 if (tb[NDA_PORT]) {
841 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
842 return -EINVAL;
843 *port = nla_get_be16(tb[NDA_PORT]);
844 } else {
845 *port = vxlan->dst_port;
846 }
847
848 if (tb[NDA_VNI]) {
849 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
850 return -EINVAL;
851 *vni = nla_get_u32(tb[NDA_VNI]);
852 } else {
853 *vni = vxlan->default_dst.remote_vni;
854 }
855
856 if (tb[NDA_IFINDEX]) {
857 struct net_device *tdev;
858
859 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
860 return -EINVAL;
861 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
862 tdev = __dev_get_by_index(net, *ifindex);
863 if (!tdev)
864 return -EADDRNOTAVAIL;
865 } else {
866 *ifindex = 0;
867 }
868
869 return 0;
870 }
871
872 /* Add static entry (via netlink) */
873 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
874 struct net_device *dev,
875 const unsigned char *addr, u16 vid, u16 flags)
876 {
877 struct vxlan_dev *vxlan = netdev_priv(dev);
878 /* struct net *net = dev_net(vxlan->dev); */
879 union vxlan_addr ip;
880 __be16 port;
881 u32 vni, ifindex;
882 int err;
883
884 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
885 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
886 ndm->ndm_state);
887 return -EINVAL;
888 }
889
890 if (tb[NDA_DST] == NULL)
891 return -EINVAL;
892
893 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
894 if (err)
895 return err;
896
897 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
898 return -EAFNOSUPPORT;
899
900 spin_lock_bh(&vxlan->hash_lock);
901 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
902 port, vni, ifindex, ndm->ndm_flags);
903 spin_unlock_bh(&vxlan->hash_lock);
904
905 return err;
906 }
907
908 /* Delete entry (via netlink) */
909 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
910 struct net_device *dev,
911 const unsigned char *addr, u16 vid)
912 {
913 struct vxlan_dev *vxlan = netdev_priv(dev);
914 struct vxlan_fdb *f;
915 struct vxlan_rdst *rd = NULL;
916 union vxlan_addr ip;
917 __be16 port;
918 u32 vni, ifindex;
919 int err;
920
921 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
922 if (err)
923 return err;
924
925 err = -ENOENT;
926
927 spin_lock_bh(&vxlan->hash_lock);
928 f = vxlan_find_mac(vxlan, addr);
929 if (!f)
930 goto out;
931
932 if (!vxlan_addr_any(&ip)) {
933 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
934 if (!rd)
935 goto out;
936 }
937
938 err = 0;
939
940 /* remove a destination if it's not the only one on the list,
941 * otherwise destroy the fdb entry
942 */
943 if (rd && !list_is_singular(&f->remotes)) {
944 list_del_rcu(&rd->list);
945 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
946 kfree_rcu(rd, rcu);
947 goto out;
948 }
949
950 vxlan_fdb_destroy(vxlan, f);
951
952 out:
953 spin_unlock_bh(&vxlan->hash_lock);
954
955 return err;
956 }
957
958 /* Dump forwarding table */
959 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
960 struct net_device *dev,
961 struct net_device *filter_dev, int idx)
962 {
963 struct vxlan_dev *vxlan = netdev_priv(dev);
964 unsigned int h;
965
966 for (h = 0; h < FDB_HASH_SIZE; ++h) {
967 struct vxlan_fdb *f;
968 int err;
969
970 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
971 struct vxlan_rdst *rd;
972
973 if (idx < cb->args[0])
974 goto skip;
975
976 list_for_each_entry_rcu(rd, &f->remotes, list) {
977 err = vxlan_fdb_info(skb, vxlan, f,
978 NETLINK_CB(cb->skb).portid,
979 cb->nlh->nlmsg_seq,
980 RTM_NEWNEIGH,
981 NLM_F_MULTI, rd);
982 if (err < 0)
983 goto out;
984 }
985 skip:
986 ++idx;
987 }
988 }
989 out:
990 return idx;
991 }
992
993 /* Watch incoming packets to learn mapping between Ethernet address
994 * and Tunnel endpoint.
995 * Return true if packet is bogus and should be droppped.
996 */
997 static bool vxlan_snoop(struct net_device *dev,
998 union vxlan_addr *src_ip, const u8 *src_mac)
999 {
1000 struct vxlan_dev *vxlan = netdev_priv(dev);
1001 struct vxlan_fdb *f;
1002
1003 f = vxlan_find_mac(vxlan, src_mac);
1004 if (likely(f)) {
1005 struct vxlan_rdst *rdst = first_remote_rcu(f);
1006
1007 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
1008 return false;
1009
1010 /* Don't migrate static entries, drop packets */
1011 if (f->state & NUD_NOARP)
1012 return true;
1013
1014 if (net_ratelimit())
1015 netdev_info(dev,
1016 "%pM migrated from %pIS to %pIS\n",
1017 src_mac, &rdst->remote_ip, &src_ip);
1018
1019 rdst->remote_ip = *src_ip;
1020 f->updated = jiffies;
1021 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1022 } else {
1023 /* learned new entry */
1024 spin_lock(&vxlan->hash_lock);
1025
1026 /* close off race between vxlan_flush and incoming packets */
1027 if (netif_running(dev))
1028 vxlan_fdb_create(vxlan, src_mac, src_ip,
1029 NUD_REACHABLE,
1030 NLM_F_EXCL|NLM_F_CREATE,
1031 vxlan->dst_port,
1032 vxlan->default_dst.remote_vni,
1033 0, NTF_SELF);
1034 spin_unlock(&vxlan->hash_lock);
1035 }
1036
1037 return false;
1038 }
1039
1040 /* See if multicast group is already in use by other ID */
1041 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1042 {
1043 struct vxlan_dev *vxlan;
1044
1045 /* The vxlan_sock is only used by dev, leaving group has
1046 * no effect on other vxlan devices.
1047 */
1048 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1049 return false;
1050
1051 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1052 if (!netif_running(vxlan->dev) || vxlan == dev)
1053 continue;
1054
1055 if (vxlan->vn_sock != dev->vn_sock)
1056 continue;
1057
1058 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1059 &dev->default_dst.remote_ip))
1060 continue;
1061
1062 if (vxlan->default_dst.remote_ifindex !=
1063 dev->default_dst.remote_ifindex)
1064 continue;
1065
1066 return true;
1067 }
1068
1069 return false;
1070 }
1071
1072 static void vxlan_sock_hold(struct vxlan_sock *vs)
1073 {
1074 atomic_inc(&vs->refcnt);
1075 }
1076
1077 void vxlan_sock_release(struct vxlan_sock *vs)
1078 {
1079 struct sock *sk = vs->sock->sk;
1080 struct net *net = sock_net(sk);
1081 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1082
1083 if (!atomic_dec_and_test(&vs->refcnt))
1084 return;
1085
1086 spin_lock(&vn->sock_lock);
1087 hlist_del_rcu(&vs->hlist);
1088 vxlan_notify_del_rx_port(vs);
1089 spin_unlock(&vn->sock_lock);
1090
1091 queue_work(vxlan_wq, &vs->del_work);
1092 }
1093 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1094
1095 /* Callback to update multicast group membership when first VNI on
1096 * multicast asddress is brought up
1097 * Done as workqueue because ip_mc_join_group acquires RTNL.
1098 */
1099 static void vxlan_igmp_join(struct work_struct *work)
1100 {
1101 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1102 struct vxlan_sock *vs = vxlan->vn_sock;
1103 struct sock *sk = vs->sock->sk;
1104 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1105 int ifindex = vxlan->default_dst.remote_ifindex;
1106
1107 lock_sock(sk);
1108 if (ip->sa.sa_family == AF_INET) {
1109 struct ip_mreqn mreq = {
1110 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1111 .imr_ifindex = ifindex,
1112 };
1113
1114 ip_mc_join_group(sk, &mreq);
1115 #if IS_ENABLED(CONFIG_IPV6)
1116 } else {
1117 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1118 &ip->sin6.sin6_addr);
1119 #endif
1120 }
1121 release_sock(sk);
1122
1123 vxlan_sock_release(vs);
1124 dev_put(vxlan->dev);
1125 }
1126
1127 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1128 static void vxlan_igmp_leave(struct work_struct *work)
1129 {
1130 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1131 struct vxlan_sock *vs = vxlan->vn_sock;
1132 struct sock *sk = vs->sock->sk;
1133 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1134 int ifindex = vxlan->default_dst.remote_ifindex;
1135
1136 lock_sock(sk);
1137 if (ip->sa.sa_family == AF_INET) {
1138 struct ip_mreqn mreq = {
1139 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1140 .imr_ifindex = ifindex,
1141 };
1142
1143 ip_mc_leave_group(sk, &mreq);
1144 #if IS_ENABLED(CONFIG_IPV6)
1145 } else {
1146 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1147 &ip->sin6.sin6_addr);
1148 #endif
1149 }
1150
1151 release_sock(sk);
1152
1153 vxlan_sock_release(vs);
1154 dev_put(vxlan->dev);
1155 }
1156
1157 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1158 size_t hdrlen, u32 data)
1159 {
1160 size_t start, offset, plen;
1161 __wsum delta;
1162
1163 if (skb->remcsum_offload) {
1164 /* Already processed in GRO path */
1165 skb->remcsum_offload = 0;
1166 return vh;
1167 }
1168
1169 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1170 offset = start + ((data & VXLAN_RCO_UDP) ?
1171 offsetof(struct udphdr, check) :
1172 offsetof(struct tcphdr, check));
1173
1174 plen = hdrlen + offset + sizeof(u16);
1175
1176 if (!pskb_may_pull(skb, plen))
1177 return NULL;
1178
1179 vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1180
1181 if (unlikely(skb->ip_summed != CHECKSUM_COMPLETE))
1182 __skb_checksum_complete(skb);
1183
1184 delta = remcsum_adjust((void *)vh + hdrlen,
1185 skb->csum, start, offset);
1186
1187 /* Adjust skb->csum since we changed the packet */
1188 skb->csum = csum_add(skb->csum, delta);
1189
1190 return vh;
1191 }
1192
1193 /* Callback from net/ipv4/udp.c to receive packets */
1194 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1195 {
1196 struct vxlan_sock *vs;
1197 struct vxlanhdr *vxh;
1198 u32 flags, vni;
1199 struct vxlan_metadata md = {0};
1200
1201 /* Need Vxlan and inner Ethernet header to be present */
1202 if (!pskb_may_pull(skb, VXLAN_HLEN))
1203 goto error;
1204
1205 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1206 flags = ntohl(vxh->vx_flags);
1207 vni = ntohl(vxh->vx_vni);
1208
1209 if (flags & VXLAN_HF_VNI) {
1210 flags &= ~VXLAN_HF_VNI;
1211 } else {
1212 /* VNI flag always required to be set */
1213 goto bad_flags;
1214 }
1215
1216 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1217 goto drop;
1218 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1219
1220 vs = rcu_dereference_sk_user_data(sk);
1221 if (!vs)
1222 goto drop;
1223
1224 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1225 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni);
1226 if (!vxh)
1227 goto drop;
1228
1229 flags &= ~VXLAN_HF_RCO;
1230 vni &= VXLAN_VID_MASK;
1231 }
1232
1233 /* For backwards compatibility, only allow reserved fields to be
1234 * used by VXLAN extensions if explicitly requested.
1235 */
1236 if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1237 struct vxlanhdr_gbp *gbp;
1238
1239 gbp = (struct vxlanhdr_gbp *)vxh;
1240 md.gbp = ntohs(gbp->policy_id);
1241
1242 if (gbp->dont_learn)
1243 md.gbp |= VXLAN_GBP_DONT_LEARN;
1244
1245 if (gbp->policy_applied)
1246 md.gbp |= VXLAN_GBP_POLICY_APPLIED;
1247
1248 flags &= ~VXLAN_GBP_USED_BITS;
1249 }
1250
1251 if (flags || (vni & ~VXLAN_VID_MASK)) {
1252 /* If there are any unprocessed flags remaining treat
1253 * this as a malformed packet. This behavior diverges from
1254 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1255 * in reserved fields are to be ignored. The approach here
1256 * maintains compatbility with previous stack code, and also
1257 * is more robust and provides a little more security in
1258 * adding extensions to VXLAN.
1259 */
1260
1261 goto bad_flags;
1262 }
1263
1264 md.vni = vxh->vx_vni;
1265 vs->rcv(vs, skb, &md);
1266 return 0;
1267
1268 drop:
1269 /* Consume bad packet */
1270 kfree_skb(skb);
1271 return 0;
1272
1273 bad_flags:
1274 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1275 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1276
1277 error:
1278 /* Return non vxlan pkt */
1279 return 1;
1280 }
1281
1282 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1283 struct vxlan_metadata *md)
1284 {
1285 struct iphdr *oip = NULL;
1286 struct ipv6hdr *oip6 = NULL;
1287 struct vxlan_dev *vxlan;
1288 struct pcpu_sw_netstats *stats;
1289 union vxlan_addr saddr;
1290 __u32 vni;
1291 int err = 0;
1292 union vxlan_addr *remote_ip;
1293
1294 vni = ntohl(md->vni) >> 8;
1295 /* Is this VNI defined? */
1296 vxlan = vxlan_vs_find_vni(vs, vni);
1297 if (!vxlan)
1298 goto drop;
1299
1300 remote_ip = &vxlan->default_dst.remote_ip;
1301 skb_reset_mac_header(skb);
1302 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1303 skb->protocol = eth_type_trans(skb, vxlan->dev);
1304 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1305
1306 /* Ignore packet loops (and multicast echo) */
1307 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1308 goto drop;
1309
1310 /* Re-examine inner Ethernet packet */
1311 if (remote_ip->sa.sa_family == AF_INET) {
1312 oip = ip_hdr(skb);
1313 saddr.sin.sin_addr.s_addr = oip->saddr;
1314 saddr.sa.sa_family = AF_INET;
1315 #if IS_ENABLED(CONFIG_IPV6)
1316 } else {
1317 oip6 = ipv6_hdr(skb);
1318 saddr.sin6.sin6_addr = oip6->saddr;
1319 saddr.sa.sa_family = AF_INET6;
1320 #endif
1321 }
1322
1323 if ((vxlan->flags & VXLAN_F_LEARN) &&
1324 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1325 goto drop;
1326
1327 skb_reset_network_header(skb);
1328 skb->mark = md->gbp;
1329
1330 if (oip6)
1331 err = IP6_ECN_decapsulate(oip6, skb);
1332 if (oip)
1333 err = IP_ECN_decapsulate(oip, skb);
1334
1335 if (unlikely(err)) {
1336 if (log_ecn_error) {
1337 if (oip6)
1338 net_info_ratelimited("non-ECT from %pI6\n",
1339 &oip6->saddr);
1340 if (oip)
1341 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1342 &oip->saddr, oip->tos);
1343 }
1344 if (err > 1) {
1345 ++vxlan->dev->stats.rx_frame_errors;
1346 ++vxlan->dev->stats.rx_errors;
1347 goto drop;
1348 }
1349 }
1350
1351 stats = this_cpu_ptr(vxlan->dev->tstats);
1352 u64_stats_update_begin(&stats->syncp);
1353 stats->rx_packets++;
1354 stats->rx_bytes += skb->len;
1355 u64_stats_update_end(&stats->syncp);
1356
1357 netif_rx(skb);
1358
1359 return;
1360 drop:
1361 /* Consume bad packet */
1362 kfree_skb(skb);
1363 }
1364
1365 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1366 {
1367 struct vxlan_dev *vxlan = netdev_priv(dev);
1368 struct arphdr *parp;
1369 u8 *arpptr, *sha;
1370 __be32 sip, tip;
1371 struct neighbour *n;
1372
1373 if (dev->flags & IFF_NOARP)
1374 goto out;
1375
1376 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1377 dev->stats.tx_dropped++;
1378 goto out;
1379 }
1380 parp = arp_hdr(skb);
1381
1382 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1383 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1384 parp->ar_pro != htons(ETH_P_IP) ||
1385 parp->ar_op != htons(ARPOP_REQUEST) ||
1386 parp->ar_hln != dev->addr_len ||
1387 parp->ar_pln != 4)
1388 goto out;
1389 arpptr = (u8 *)parp + sizeof(struct arphdr);
1390 sha = arpptr;
1391 arpptr += dev->addr_len; /* sha */
1392 memcpy(&sip, arpptr, sizeof(sip));
1393 arpptr += sizeof(sip);
1394 arpptr += dev->addr_len; /* tha */
1395 memcpy(&tip, arpptr, sizeof(tip));
1396
1397 if (ipv4_is_loopback(tip) ||
1398 ipv4_is_multicast(tip))
1399 goto out;
1400
1401 n = neigh_lookup(&arp_tbl, &tip, dev);
1402
1403 if (n) {
1404 struct vxlan_fdb *f;
1405 struct sk_buff *reply;
1406
1407 if (!(n->nud_state & NUD_CONNECTED)) {
1408 neigh_release(n);
1409 goto out;
1410 }
1411
1412 f = vxlan_find_mac(vxlan, n->ha);
1413 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1414 /* bridge-local neighbor */
1415 neigh_release(n);
1416 goto out;
1417 }
1418
1419 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1420 n->ha, sha);
1421
1422 neigh_release(n);
1423
1424 if (reply == NULL)
1425 goto out;
1426
1427 skb_reset_mac_header(reply);
1428 __skb_pull(reply, skb_network_offset(reply));
1429 reply->ip_summed = CHECKSUM_UNNECESSARY;
1430 reply->pkt_type = PACKET_HOST;
1431
1432 if (netif_rx_ni(reply) == NET_RX_DROP)
1433 dev->stats.rx_dropped++;
1434 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1435 union vxlan_addr ipa = {
1436 .sin.sin_addr.s_addr = tip,
1437 .sin.sin_family = AF_INET,
1438 };
1439
1440 vxlan_ip_miss(dev, &ipa);
1441 }
1442 out:
1443 consume_skb(skb);
1444 return NETDEV_TX_OK;
1445 }
1446
1447 #if IS_ENABLED(CONFIG_IPV6)
1448 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1449 struct neighbour *n, bool isrouter)
1450 {
1451 struct net_device *dev = request->dev;
1452 struct sk_buff *reply;
1453 struct nd_msg *ns, *na;
1454 struct ipv6hdr *pip6;
1455 u8 *daddr;
1456 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1457 int ns_olen;
1458 int i, len;
1459
1460 if (dev == NULL)
1461 return NULL;
1462
1463 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1464 sizeof(*na) + na_olen + dev->needed_tailroom;
1465 reply = alloc_skb(len, GFP_ATOMIC);
1466 if (reply == NULL)
1467 return NULL;
1468
1469 reply->protocol = htons(ETH_P_IPV6);
1470 reply->dev = dev;
1471 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1472 skb_push(reply, sizeof(struct ethhdr));
1473 skb_set_mac_header(reply, 0);
1474
1475 ns = (struct nd_msg *)skb_transport_header(request);
1476
1477 daddr = eth_hdr(request)->h_source;
1478 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1479 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1480 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1481 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1482 break;
1483 }
1484 }
1485
1486 /* Ethernet header */
1487 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1488 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1489 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1490 reply->protocol = htons(ETH_P_IPV6);
1491
1492 skb_pull(reply, sizeof(struct ethhdr));
1493 skb_set_network_header(reply, 0);
1494 skb_put(reply, sizeof(struct ipv6hdr));
1495
1496 /* IPv6 header */
1497
1498 pip6 = ipv6_hdr(reply);
1499 memset(pip6, 0, sizeof(struct ipv6hdr));
1500 pip6->version = 6;
1501 pip6->priority = ipv6_hdr(request)->priority;
1502 pip6->nexthdr = IPPROTO_ICMPV6;
1503 pip6->hop_limit = 255;
1504 pip6->daddr = ipv6_hdr(request)->saddr;
1505 pip6->saddr = *(struct in6_addr *)n->primary_key;
1506
1507 skb_pull(reply, sizeof(struct ipv6hdr));
1508 skb_set_transport_header(reply, 0);
1509
1510 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1511
1512 /* Neighbor Advertisement */
1513 memset(na, 0, sizeof(*na)+na_olen);
1514 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1515 na->icmph.icmp6_router = isrouter;
1516 na->icmph.icmp6_override = 1;
1517 na->icmph.icmp6_solicited = 1;
1518 na->target = ns->target;
1519 ether_addr_copy(&na->opt[2], n->ha);
1520 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1521 na->opt[1] = na_olen >> 3;
1522
1523 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1524 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1525 csum_partial(na, sizeof(*na)+na_olen, 0));
1526
1527 pip6->payload_len = htons(sizeof(*na)+na_olen);
1528
1529 skb_push(reply, sizeof(struct ipv6hdr));
1530
1531 reply->ip_summed = CHECKSUM_UNNECESSARY;
1532
1533 return reply;
1534 }
1535
1536 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1537 {
1538 struct vxlan_dev *vxlan = netdev_priv(dev);
1539 struct nd_msg *msg;
1540 const struct ipv6hdr *iphdr;
1541 const struct in6_addr *saddr, *daddr;
1542 struct neighbour *n;
1543 struct inet6_dev *in6_dev;
1544
1545 in6_dev = __in6_dev_get(dev);
1546 if (!in6_dev)
1547 goto out;
1548
1549 iphdr = ipv6_hdr(skb);
1550 saddr = &iphdr->saddr;
1551 daddr = &iphdr->daddr;
1552
1553 msg = (struct nd_msg *)skb_transport_header(skb);
1554 if (msg->icmph.icmp6_code != 0 ||
1555 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1556 goto out;
1557
1558 if (ipv6_addr_loopback(daddr) ||
1559 ipv6_addr_is_multicast(&msg->target))
1560 goto out;
1561
1562 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1563
1564 if (n) {
1565 struct vxlan_fdb *f;
1566 struct sk_buff *reply;
1567
1568 if (!(n->nud_state & NUD_CONNECTED)) {
1569 neigh_release(n);
1570 goto out;
1571 }
1572
1573 f = vxlan_find_mac(vxlan, n->ha);
1574 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1575 /* bridge-local neighbor */
1576 neigh_release(n);
1577 goto out;
1578 }
1579
1580 reply = vxlan_na_create(skb, n,
1581 !!(f ? f->flags & NTF_ROUTER : 0));
1582
1583 neigh_release(n);
1584
1585 if (reply == NULL)
1586 goto out;
1587
1588 if (netif_rx_ni(reply) == NET_RX_DROP)
1589 dev->stats.rx_dropped++;
1590
1591 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1592 union vxlan_addr ipa = {
1593 .sin6.sin6_addr = msg->target,
1594 .sin6.sin6_family = AF_INET6,
1595 };
1596
1597 vxlan_ip_miss(dev, &ipa);
1598 }
1599
1600 out:
1601 consume_skb(skb);
1602 return NETDEV_TX_OK;
1603 }
1604 #endif
1605
1606 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1607 {
1608 struct vxlan_dev *vxlan = netdev_priv(dev);
1609 struct neighbour *n;
1610
1611 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1612 return false;
1613
1614 n = NULL;
1615 switch (ntohs(eth_hdr(skb)->h_proto)) {
1616 case ETH_P_IP:
1617 {
1618 struct iphdr *pip;
1619
1620 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1621 return false;
1622 pip = ip_hdr(skb);
1623 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1624 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1625 union vxlan_addr ipa = {
1626 .sin.sin_addr.s_addr = pip->daddr,
1627 .sin.sin_family = AF_INET,
1628 };
1629
1630 vxlan_ip_miss(dev, &ipa);
1631 return false;
1632 }
1633
1634 break;
1635 }
1636 #if IS_ENABLED(CONFIG_IPV6)
1637 case ETH_P_IPV6:
1638 {
1639 struct ipv6hdr *pip6;
1640
1641 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1642 return false;
1643 pip6 = ipv6_hdr(skb);
1644 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1645 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1646 union vxlan_addr ipa = {
1647 .sin6.sin6_addr = pip6->daddr,
1648 .sin6.sin6_family = AF_INET6,
1649 };
1650
1651 vxlan_ip_miss(dev, &ipa);
1652 return false;
1653 }
1654
1655 break;
1656 }
1657 #endif
1658 default:
1659 return false;
1660 }
1661
1662 if (n) {
1663 bool diff;
1664
1665 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1666 if (diff) {
1667 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1668 dev->addr_len);
1669 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1670 }
1671 neigh_release(n);
1672 return diff;
1673 }
1674
1675 return false;
1676 }
1677
1678 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1679 struct vxlan_metadata *md)
1680 {
1681 struct vxlanhdr_gbp *gbp;
1682
1683 gbp = (struct vxlanhdr_gbp *)vxh;
1684 vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1685
1686 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1687 gbp->dont_learn = 1;
1688
1689 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1690 gbp->policy_applied = 1;
1691
1692 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1693 }
1694
1695 #if IS_ENABLED(CONFIG_IPV6)
1696 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sk_buff *skb,
1697 struct net_device *dev, struct in6_addr *saddr,
1698 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1699 __be16 src_port, __be16 dst_port,
1700 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1701 {
1702 struct vxlanhdr *vxh;
1703 int min_headroom;
1704 int err;
1705 bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1706 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1707 u16 hdrlen = sizeof(struct vxlanhdr);
1708
1709 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1710 skb->ip_summed == CHECKSUM_PARTIAL) {
1711 int csum_start = skb_checksum_start_offset(skb);
1712
1713 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1714 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1715 (skb->csum_offset == offsetof(struct udphdr, check) ||
1716 skb->csum_offset == offsetof(struct tcphdr, check))) {
1717 udp_sum = false;
1718 type |= SKB_GSO_TUNNEL_REMCSUM;
1719 }
1720 }
1721
1722 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1723 if (IS_ERR(skb)) {
1724 err = -EINVAL;
1725 goto err;
1726 }
1727
1728 skb_scrub_packet(skb, xnet);
1729
1730 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1731 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1732 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1733
1734 /* Need space for new headers (invalidates iph ptr) */
1735 err = skb_cow_head(skb, min_headroom);
1736 if (unlikely(err)) {
1737 kfree_skb(skb);
1738 goto err;
1739 }
1740
1741 skb = vlan_hwaccel_push_inside(skb);
1742 if (WARN_ON(!skb)) {
1743 err = -ENOMEM;
1744 goto err;
1745 }
1746
1747 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1748 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1749 vxh->vx_vni = md->vni;
1750
1751 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1752 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1753 VXLAN_RCO_SHIFT;
1754
1755 if (skb->csum_offset == offsetof(struct udphdr, check))
1756 data |= VXLAN_RCO_UDP;
1757
1758 vxh->vx_vni |= htonl(data);
1759 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1760
1761 if (!skb_is_gso(skb)) {
1762 skb->ip_summed = CHECKSUM_NONE;
1763 skb->encapsulation = 0;
1764 }
1765 }
1766
1767 if (vxflags & VXLAN_F_GBP)
1768 vxlan_build_gbp_hdr(vxh, vxflags, md);
1769
1770 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1771
1772 udp_tunnel6_xmit_skb(dst, skb, dev, saddr, daddr, prio,
1773 ttl, src_port, dst_port,
1774 !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1775 return 0;
1776 err:
1777 dst_release(dst);
1778 return err;
1779 }
1780 #endif
1781
1782 int vxlan_xmit_skb(struct rtable *rt, struct sk_buff *skb,
1783 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1784 __be16 src_port, __be16 dst_port,
1785 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1786 {
1787 struct vxlanhdr *vxh;
1788 int min_headroom;
1789 int err;
1790 bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1791 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1792 u16 hdrlen = sizeof(struct vxlanhdr);
1793
1794 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1795 skb->ip_summed == CHECKSUM_PARTIAL) {
1796 int csum_start = skb_checksum_start_offset(skb);
1797
1798 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1799 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1800 (skb->csum_offset == offsetof(struct udphdr, check) ||
1801 skb->csum_offset == offsetof(struct tcphdr, check))) {
1802 udp_sum = false;
1803 type |= SKB_GSO_TUNNEL_REMCSUM;
1804 }
1805 }
1806
1807 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1808 if (IS_ERR(skb))
1809 return PTR_ERR(skb);
1810
1811 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1812 + VXLAN_HLEN + sizeof(struct iphdr)
1813 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1814
1815 /* Need space for new headers (invalidates iph ptr) */
1816 err = skb_cow_head(skb, min_headroom);
1817 if (unlikely(err)) {
1818 kfree_skb(skb);
1819 return err;
1820 }
1821
1822 skb = vlan_hwaccel_push_inside(skb);
1823 if (WARN_ON(!skb))
1824 return -ENOMEM;
1825
1826 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1827 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1828 vxh->vx_vni = md->vni;
1829
1830 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1831 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1832 VXLAN_RCO_SHIFT;
1833
1834 if (skb->csum_offset == offsetof(struct udphdr, check))
1835 data |= VXLAN_RCO_UDP;
1836
1837 vxh->vx_vni |= htonl(data);
1838 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1839
1840 if (!skb_is_gso(skb)) {
1841 skb->ip_summed = CHECKSUM_NONE;
1842 skb->encapsulation = 0;
1843 }
1844 }
1845
1846 if (vxflags & VXLAN_F_GBP)
1847 vxlan_build_gbp_hdr(vxh, vxflags, md);
1848
1849 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1850
1851 return udp_tunnel_xmit_skb(rt, skb, src, dst, tos,
1852 ttl, df, src_port, dst_port, xnet,
1853 !(vxflags & VXLAN_F_UDP_CSUM));
1854 }
1855 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1856
1857 /* Bypass encapsulation if the destination is local */
1858 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1859 struct vxlan_dev *dst_vxlan)
1860 {
1861 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1862 union vxlan_addr loopback;
1863 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1864 struct net_device *dev = skb->dev;
1865 int len = skb->len;
1866
1867 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1868 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1869 skb->pkt_type = PACKET_HOST;
1870 skb->encapsulation = 0;
1871 skb->dev = dst_vxlan->dev;
1872 __skb_pull(skb, skb_network_offset(skb));
1873
1874 if (remote_ip->sa.sa_family == AF_INET) {
1875 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1876 loopback.sa.sa_family = AF_INET;
1877 #if IS_ENABLED(CONFIG_IPV6)
1878 } else {
1879 loopback.sin6.sin6_addr = in6addr_loopback;
1880 loopback.sa.sa_family = AF_INET6;
1881 #endif
1882 }
1883
1884 if (dst_vxlan->flags & VXLAN_F_LEARN)
1885 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1886
1887 u64_stats_update_begin(&tx_stats->syncp);
1888 tx_stats->tx_packets++;
1889 tx_stats->tx_bytes += len;
1890 u64_stats_update_end(&tx_stats->syncp);
1891
1892 if (netif_rx(skb) == NET_RX_SUCCESS) {
1893 u64_stats_update_begin(&rx_stats->syncp);
1894 rx_stats->rx_packets++;
1895 rx_stats->rx_bytes += len;
1896 u64_stats_update_end(&rx_stats->syncp);
1897 } else {
1898 dev->stats.rx_dropped++;
1899 }
1900 }
1901
1902 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1903 struct vxlan_rdst *rdst, bool did_rsc)
1904 {
1905 struct vxlan_dev *vxlan = netdev_priv(dev);
1906 struct rtable *rt = NULL;
1907 const struct iphdr *old_iph;
1908 struct flowi4 fl4;
1909 union vxlan_addr *dst;
1910 struct vxlan_metadata md;
1911 __be16 src_port = 0, dst_port;
1912 u32 vni;
1913 __be16 df = 0;
1914 __u8 tos, ttl;
1915 int err;
1916
1917 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1918 vni = rdst->remote_vni;
1919 dst = &rdst->remote_ip;
1920
1921 if (vxlan_addr_any(dst)) {
1922 if (did_rsc) {
1923 /* short-circuited back to local bridge */
1924 vxlan_encap_bypass(skb, vxlan, vxlan);
1925 return;
1926 }
1927 goto drop;
1928 }
1929
1930 old_iph = ip_hdr(skb);
1931
1932 ttl = vxlan->ttl;
1933 if (!ttl && vxlan_addr_multicast(dst))
1934 ttl = 1;
1935
1936 tos = vxlan->tos;
1937 if (tos == 1)
1938 tos = ip_tunnel_get_dsfield(old_iph, skb);
1939
1940 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1941 vxlan->port_max, true);
1942
1943 if (dst->sa.sa_family == AF_INET) {
1944 memset(&fl4, 0, sizeof(fl4));
1945 fl4.flowi4_oif = rdst->remote_ifindex;
1946 fl4.flowi4_tos = RT_TOS(tos);
1947 fl4.daddr = dst->sin.sin_addr.s_addr;
1948 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1949
1950 rt = ip_route_output_key(vxlan->net, &fl4);
1951 if (IS_ERR(rt)) {
1952 netdev_dbg(dev, "no route to %pI4\n",
1953 &dst->sin.sin_addr.s_addr);
1954 dev->stats.tx_carrier_errors++;
1955 goto tx_error;
1956 }
1957
1958 if (rt->dst.dev == dev) {
1959 netdev_dbg(dev, "circular route to %pI4\n",
1960 &dst->sin.sin_addr.s_addr);
1961 dev->stats.collisions++;
1962 goto rt_tx_error;
1963 }
1964
1965 /* Bypass encapsulation if the destination is local */
1966 if (rt->rt_flags & RTCF_LOCAL &&
1967 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1968 struct vxlan_dev *dst_vxlan;
1969
1970 ip_rt_put(rt);
1971 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1972 dst->sa.sa_family, dst_port,
1973 vxlan->flags);
1974 if (!dst_vxlan)
1975 goto tx_error;
1976 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1977 return;
1978 }
1979
1980 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1981 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1982 md.vni = htonl(vni << 8);
1983 md.gbp = skb->mark;
1984
1985 err = vxlan_xmit_skb(rt, skb, fl4.saddr,
1986 dst->sin.sin_addr.s_addr, tos, ttl, df,
1987 src_port, dst_port, &md,
1988 !net_eq(vxlan->net, dev_net(vxlan->dev)),
1989 vxlan->flags);
1990 if (err < 0) {
1991 /* skb is already freed. */
1992 skb = NULL;
1993 goto rt_tx_error;
1994 }
1995
1996 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1997 #if IS_ENABLED(CONFIG_IPV6)
1998 } else {
1999 struct sock *sk = vxlan->vn_sock->sock->sk;
2000 struct dst_entry *ndst;
2001 struct flowi6 fl6;
2002 u32 flags;
2003
2004 memset(&fl6, 0, sizeof(fl6));
2005 fl6.flowi6_oif = rdst->remote_ifindex;
2006 fl6.daddr = dst->sin6.sin6_addr;
2007 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
2008 fl6.flowi6_proto = IPPROTO_UDP;
2009
2010 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
2011 netdev_dbg(dev, "no route to %pI6\n",
2012 &dst->sin6.sin6_addr);
2013 dev->stats.tx_carrier_errors++;
2014 goto tx_error;
2015 }
2016
2017 if (ndst->dev == dev) {
2018 netdev_dbg(dev, "circular route to %pI6\n",
2019 &dst->sin6.sin6_addr);
2020 dst_release(ndst);
2021 dev->stats.collisions++;
2022 goto tx_error;
2023 }
2024
2025 /* Bypass encapsulation if the destination is local */
2026 flags = ((struct rt6_info *)ndst)->rt6i_flags;
2027 if (flags & RTF_LOCAL &&
2028 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2029 struct vxlan_dev *dst_vxlan;
2030
2031 dst_release(ndst);
2032 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2033 dst->sa.sa_family, dst_port,
2034 vxlan->flags);
2035 if (!dst_vxlan)
2036 goto tx_error;
2037 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2038 return;
2039 }
2040
2041 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2042 md.vni = htonl(vni << 8);
2043 md.gbp = skb->mark;
2044
2045 err = vxlan6_xmit_skb(ndst, skb, dev, &fl6.saddr, &fl6.daddr,
2046 0, ttl, src_port, dst_port, &md,
2047 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2048 vxlan->flags);
2049 #endif
2050 }
2051
2052 return;
2053
2054 drop:
2055 dev->stats.tx_dropped++;
2056 goto tx_free;
2057
2058 rt_tx_error:
2059 ip_rt_put(rt);
2060 tx_error:
2061 dev->stats.tx_errors++;
2062 tx_free:
2063 dev_kfree_skb(skb);
2064 }
2065
2066 /* Transmit local packets over Vxlan
2067 *
2068 * Outer IP header inherits ECN and DF from inner header.
2069 * Outer UDP destination is the VXLAN assigned port.
2070 * source port is based on hash of flow
2071 */
2072 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2073 {
2074 struct vxlan_dev *vxlan = netdev_priv(dev);
2075 struct ethhdr *eth;
2076 bool did_rsc = false;
2077 struct vxlan_rdst *rdst, *fdst = NULL;
2078 struct vxlan_fdb *f;
2079
2080 skb_reset_mac_header(skb);
2081 eth = eth_hdr(skb);
2082
2083 if ((vxlan->flags & VXLAN_F_PROXY)) {
2084 if (ntohs(eth->h_proto) == ETH_P_ARP)
2085 return arp_reduce(dev, skb);
2086 #if IS_ENABLED(CONFIG_IPV6)
2087 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2088 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2089 + sizeof(struct nd_msg)) &&
2090 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2091 struct nd_msg *msg;
2092
2093 msg = (struct nd_msg *)skb_transport_header(skb);
2094 if (msg->icmph.icmp6_code == 0 &&
2095 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2096 return neigh_reduce(dev, skb);
2097 }
2098 eth = eth_hdr(skb);
2099 #endif
2100 }
2101
2102 f = vxlan_find_mac(vxlan, eth->h_dest);
2103 did_rsc = false;
2104
2105 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2106 (ntohs(eth->h_proto) == ETH_P_IP ||
2107 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2108 did_rsc = route_shortcircuit(dev, skb);
2109 if (did_rsc)
2110 f = vxlan_find_mac(vxlan, eth->h_dest);
2111 }
2112
2113 if (f == NULL) {
2114 f = vxlan_find_mac(vxlan, all_zeros_mac);
2115 if (f == NULL) {
2116 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2117 !is_multicast_ether_addr(eth->h_dest))
2118 vxlan_fdb_miss(vxlan, eth->h_dest);
2119
2120 dev->stats.tx_dropped++;
2121 kfree_skb(skb);
2122 return NETDEV_TX_OK;
2123 }
2124 }
2125
2126 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2127 struct sk_buff *skb1;
2128
2129 if (!fdst) {
2130 fdst = rdst;
2131 continue;
2132 }
2133 skb1 = skb_clone(skb, GFP_ATOMIC);
2134 if (skb1)
2135 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2136 }
2137
2138 if (fdst)
2139 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2140 else
2141 kfree_skb(skb);
2142 return NETDEV_TX_OK;
2143 }
2144
2145 /* Walk the forwarding table and purge stale entries */
2146 static void vxlan_cleanup(unsigned long arg)
2147 {
2148 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2149 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2150 unsigned int h;
2151
2152 if (!netif_running(vxlan->dev))
2153 return;
2154
2155 spin_lock_bh(&vxlan->hash_lock);
2156 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2157 struct hlist_node *p, *n;
2158 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2159 struct vxlan_fdb *f
2160 = container_of(p, struct vxlan_fdb, hlist);
2161 unsigned long timeout;
2162
2163 if (f->state & NUD_PERMANENT)
2164 continue;
2165
2166 timeout = f->used + vxlan->age_interval * HZ;
2167 if (time_before_eq(timeout, jiffies)) {
2168 netdev_dbg(vxlan->dev,
2169 "garbage collect %pM\n",
2170 f->eth_addr);
2171 f->state = NUD_STALE;
2172 vxlan_fdb_destroy(vxlan, f);
2173 } else if (time_before(timeout, next_timer))
2174 next_timer = timeout;
2175 }
2176 }
2177 spin_unlock_bh(&vxlan->hash_lock);
2178
2179 mod_timer(&vxlan->age_timer, next_timer);
2180 }
2181
2182 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2183 {
2184 __u32 vni = vxlan->default_dst.remote_vni;
2185
2186 vxlan->vn_sock = vs;
2187 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2188 }
2189
2190 /* Setup stats when device is created */
2191 static int vxlan_init(struct net_device *dev)
2192 {
2193 struct vxlan_dev *vxlan = netdev_priv(dev);
2194 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2195 struct vxlan_sock *vs;
2196 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2197
2198 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2199 if (!dev->tstats)
2200 return -ENOMEM;
2201
2202 spin_lock(&vn->sock_lock);
2203 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2204 vxlan->dst_port, vxlan->flags);
2205 if (vs && atomic_add_unless(&vs->refcnt, 1, 0)) {
2206 /* If we have a socket with same port already, reuse it */
2207 vxlan_vs_add_dev(vs, vxlan);
2208 } else {
2209 /* otherwise make new socket outside of RTNL */
2210 dev_hold(dev);
2211 queue_work(vxlan_wq, &vxlan->sock_work);
2212 }
2213 spin_unlock(&vn->sock_lock);
2214
2215 return 0;
2216 }
2217
2218 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2219 {
2220 struct vxlan_fdb *f;
2221
2222 spin_lock_bh(&vxlan->hash_lock);
2223 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2224 if (f)
2225 vxlan_fdb_destroy(vxlan, f);
2226 spin_unlock_bh(&vxlan->hash_lock);
2227 }
2228
2229 static void vxlan_uninit(struct net_device *dev)
2230 {
2231 struct vxlan_dev *vxlan = netdev_priv(dev);
2232 struct vxlan_sock *vs = vxlan->vn_sock;
2233
2234 vxlan_fdb_delete_default(vxlan);
2235
2236 if (vs)
2237 vxlan_sock_release(vs);
2238 free_percpu(dev->tstats);
2239 }
2240
2241 /* Start ageing timer and join group when device is brought up */
2242 static int vxlan_open(struct net_device *dev)
2243 {
2244 struct vxlan_dev *vxlan = netdev_priv(dev);
2245 struct vxlan_sock *vs = vxlan->vn_sock;
2246
2247 /* socket hasn't been created */
2248 if (!vs)
2249 return -ENOTCONN;
2250
2251 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2252 vxlan_sock_hold(vs);
2253 dev_hold(dev);
2254 queue_work(vxlan_wq, &vxlan->igmp_join);
2255 }
2256
2257 if (vxlan->age_interval)
2258 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2259
2260 return 0;
2261 }
2262
2263 /* Purge the forwarding table */
2264 static void vxlan_flush(struct vxlan_dev *vxlan)
2265 {
2266 unsigned int h;
2267
2268 spin_lock_bh(&vxlan->hash_lock);
2269 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2270 struct hlist_node *p, *n;
2271 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2272 struct vxlan_fdb *f
2273 = container_of(p, struct vxlan_fdb, hlist);
2274 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2275 if (!is_zero_ether_addr(f->eth_addr))
2276 vxlan_fdb_destroy(vxlan, f);
2277 }
2278 }
2279 spin_unlock_bh(&vxlan->hash_lock);
2280 }
2281
2282 /* Cleanup timer and forwarding table on shutdown */
2283 static int vxlan_stop(struct net_device *dev)
2284 {
2285 struct vxlan_dev *vxlan = netdev_priv(dev);
2286 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2287 struct vxlan_sock *vs = vxlan->vn_sock;
2288
2289 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2290 !vxlan_group_used(vn, vxlan)) {
2291 vxlan_sock_hold(vs);
2292 dev_hold(dev);
2293 queue_work(vxlan_wq, &vxlan->igmp_leave);
2294 }
2295
2296 del_timer_sync(&vxlan->age_timer);
2297
2298 vxlan_flush(vxlan);
2299
2300 return 0;
2301 }
2302
2303 /* Stub, nothing needs to be done. */
2304 static void vxlan_set_multicast_list(struct net_device *dev)
2305 {
2306 }
2307
2308 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2309 {
2310 struct vxlan_dev *vxlan = netdev_priv(dev);
2311 struct vxlan_rdst *dst = &vxlan->default_dst;
2312 struct net_device *lowerdev;
2313 int max_mtu;
2314
2315 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2316 if (lowerdev == NULL)
2317 return eth_change_mtu(dev, new_mtu);
2318
2319 if (dst->remote_ip.sa.sa_family == AF_INET6)
2320 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2321 else
2322 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2323
2324 if (new_mtu < 68 || new_mtu > max_mtu)
2325 return -EINVAL;
2326
2327 dev->mtu = new_mtu;
2328 return 0;
2329 }
2330
2331 static const struct net_device_ops vxlan_netdev_ops = {
2332 .ndo_init = vxlan_init,
2333 .ndo_uninit = vxlan_uninit,
2334 .ndo_open = vxlan_open,
2335 .ndo_stop = vxlan_stop,
2336 .ndo_start_xmit = vxlan_xmit,
2337 .ndo_get_stats64 = ip_tunnel_get_stats64,
2338 .ndo_set_rx_mode = vxlan_set_multicast_list,
2339 .ndo_change_mtu = vxlan_change_mtu,
2340 .ndo_validate_addr = eth_validate_addr,
2341 .ndo_set_mac_address = eth_mac_addr,
2342 .ndo_fdb_add = vxlan_fdb_add,
2343 .ndo_fdb_del = vxlan_fdb_delete,
2344 .ndo_fdb_dump = vxlan_fdb_dump,
2345 };
2346
2347 /* Info for udev, that this is a virtual tunnel endpoint */
2348 static struct device_type vxlan_type = {
2349 .name = "vxlan",
2350 };
2351
2352 /* Calls the ndo_add_vxlan_port of the caller in order to
2353 * supply the listening VXLAN udp ports. Callers are expected
2354 * to implement the ndo_add_vxlan_port.
2355 */
2356 void vxlan_get_rx_port(struct net_device *dev)
2357 {
2358 struct vxlan_sock *vs;
2359 struct net *net = dev_net(dev);
2360 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2361 sa_family_t sa_family;
2362 __be16 port;
2363 unsigned int i;
2364
2365 spin_lock(&vn->sock_lock);
2366 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2367 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2368 port = inet_sk(vs->sock->sk)->inet_sport;
2369 sa_family = vs->sock->sk->sk_family;
2370 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2371 port);
2372 }
2373 }
2374 spin_unlock(&vn->sock_lock);
2375 }
2376 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2377
2378 /* Initialize the device structure. */
2379 static void vxlan_setup(struct net_device *dev)
2380 {
2381 struct vxlan_dev *vxlan = netdev_priv(dev);
2382 unsigned int h;
2383
2384 eth_hw_addr_random(dev);
2385 ether_setup(dev);
2386 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2387 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2388 else
2389 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2390
2391 dev->netdev_ops = &vxlan_netdev_ops;
2392 dev->destructor = free_netdev;
2393 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2394
2395 dev->tx_queue_len = 0;
2396 dev->features |= NETIF_F_LLTX;
2397 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2398 dev->features |= NETIF_F_RXCSUM;
2399 dev->features |= NETIF_F_GSO_SOFTWARE;
2400
2401 dev->vlan_features = dev->features;
2402 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2403 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2404 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2405 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2406 netif_keep_dst(dev);
2407 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2408
2409 INIT_LIST_HEAD(&vxlan->next);
2410 spin_lock_init(&vxlan->hash_lock);
2411 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2412 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2413 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2414
2415 init_timer_deferrable(&vxlan->age_timer);
2416 vxlan->age_timer.function = vxlan_cleanup;
2417 vxlan->age_timer.data = (unsigned long) vxlan;
2418
2419 vxlan->dst_port = htons(vxlan_port);
2420
2421 vxlan->dev = dev;
2422
2423 for (h = 0; h < FDB_HASH_SIZE; ++h)
2424 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2425 }
2426
2427 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2428 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2429 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2430 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2431 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2432 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2433 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2434 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2435 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2436 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2437 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2438 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2439 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2440 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2441 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2442 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2443 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2444 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2445 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2446 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2447 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2448 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2449 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2450 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2451 };
2452
2453 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2454 {
2455 if (tb[IFLA_ADDRESS]) {
2456 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2457 pr_debug("invalid link address (not ethernet)\n");
2458 return -EINVAL;
2459 }
2460
2461 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2462 pr_debug("invalid all zero ethernet address\n");
2463 return -EADDRNOTAVAIL;
2464 }
2465 }
2466
2467 if (!data)
2468 return -EINVAL;
2469
2470 if (data[IFLA_VXLAN_ID]) {
2471 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2472 if (id >= VXLAN_VID_MASK)
2473 return -ERANGE;
2474 }
2475
2476 if (data[IFLA_VXLAN_PORT_RANGE]) {
2477 const struct ifla_vxlan_port_range *p
2478 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2479
2480 if (ntohs(p->high) < ntohs(p->low)) {
2481 pr_debug("port range %u .. %u not valid\n",
2482 ntohs(p->low), ntohs(p->high));
2483 return -EINVAL;
2484 }
2485 }
2486
2487 return 0;
2488 }
2489
2490 static void vxlan_get_drvinfo(struct net_device *netdev,
2491 struct ethtool_drvinfo *drvinfo)
2492 {
2493 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2494 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2495 }
2496
2497 static const struct ethtool_ops vxlan_ethtool_ops = {
2498 .get_drvinfo = vxlan_get_drvinfo,
2499 .get_link = ethtool_op_get_link,
2500 };
2501
2502 static void vxlan_del_work(struct work_struct *work)
2503 {
2504 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2505 udp_tunnel_sock_release(vs->sock);
2506 kfree_rcu(vs, rcu);
2507 }
2508
2509 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2510 __be16 port, u32 flags)
2511 {
2512 struct socket *sock;
2513 struct udp_port_cfg udp_conf;
2514 int err;
2515
2516 memset(&udp_conf, 0, sizeof(udp_conf));
2517
2518 if (ipv6) {
2519 udp_conf.family = AF_INET6;
2520 udp_conf.use_udp6_rx_checksums =
2521 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2522 } else {
2523 udp_conf.family = AF_INET;
2524 udp_conf.local_ip.s_addr = INADDR_ANY;
2525 }
2526
2527 udp_conf.local_udp_port = port;
2528
2529 /* Open UDP socket */
2530 err = udp_sock_create(net, &udp_conf, &sock);
2531 if (err < 0)
2532 return ERR_PTR(err);
2533
2534 return sock;
2535 }
2536
2537 /* Create new listen socket if needed */
2538 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2539 vxlan_rcv_t *rcv, void *data,
2540 u32 flags)
2541 {
2542 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2543 struct vxlan_sock *vs;
2544 struct socket *sock;
2545 unsigned int h;
2546 bool ipv6 = !!(flags & VXLAN_F_IPV6);
2547 struct udp_tunnel_sock_cfg tunnel_cfg;
2548
2549 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2550 if (!vs)
2551 return ERR_PTR(-ENOMEM);
2552
2553 for (h = 0; h < VNI_HASH_SIZE; ++h)
2554 INIT_HLIST_HEAD(&vs->vni_list[h]);
2555
2556 INIT_WORK(&vs->del_work, vxlan_del_work);
2557
2558 sock = vxlan_create_sock(net, ipv6, port, flags);
2559 if (IS_ERR(sock)) {
2560 kfree(vs);
2561 return ERR_CAST(sock);
2562 }
2563
2564 vs->sock = sock;
2565 atomic_set(&vs->refcnt, 1);
2566 vs->rcv = rcv;
2567 vs->data = data;
2568 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2569
2570 /* Initialize the vxlan udp offloads structure */
2571 vs->udp_offloads.port = port;
2572 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2573 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2574
2575 spin_lock(&vn->sock_lock);
2576 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2577 vxlan_notify_add_rx_port(vs);
2578 spin_unlock(&vn->sock_lock);
2579
2580 /* Mark socket as an encapsulation socket. */
2581 tunnel_cfg.sk_user_data = vs;
2582 tunnel_cfg.encap_type = 1;
2583 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2584 tunnel_cfg.encap_destroy = NULL;
2585
2586 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2587
2588 return vs;
2589 }
2590
2591 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2592 vxlan_rcv_t *rcv, void *data,
2593 bool no_share, u32 flags)
2594 {
2595 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2596 struct vxlan_sock *vs;
2597 bool ipv6 = flags & VXLAN_F_IPV6;
2598
2599 vs = vxlan_socket_create(net, port, rcv, data, flags);
2600 if (!IS_ERR(vs))
2601 return vs;
2602
2603 if (no_share) /* Return error if sharing is not allowed. */
2604 return vs;
2605
2606 spin_lock(&vn->sock_lock);
2607 vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port, flags);
2608 if (vs && ((vs->rcv != rcv) ||
2609 !atomic_add_unless(&vs->refcnt, 1, 0)))
2610 vs = ERR_PTR(-EBUSY);
2611 spin_unlock(&vn->sock_lock);
2612
2613 if (!vs)
2614 vs = ERR_PTR(-EINVAL);
2615
2616 return vs;
2617 }
2618 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2619
2620 /* Scheduled at device creation to bind to a socket */
2621 static void vxlan_sock_work(struct work_struct *work)
2622 {
2623 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2624 struct net *net = vxlan->net;
2625 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2626 __be16 port = vxlan->dst_port;
2627 struct vxlan_sock *nvs;
2628
2629 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
2630 spin_lock(&vn->sock_lock);
2631 if (!IS_ERR(nvs))
2632 vxlan_vs_add_dev(nvs, vxlan);
2633 spin_unlock(&vn->sock_lock);
2634
2635 dev_put(vxlan->dev);
2636 }
2637
2638 static int vxlan_newlink(struct net *net, struct net_device *dev,
2639 struct nlattr *tb[], struct nlattr *data[])
2640 {
2641 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2642 struct vxlan_dev *vxlan = netdev_priv(dev);
2643 struct vxlan_rdst *dst = &vxlan->default_dst;
2644 __u32 vni;
2645 int err;
2646 bool use_ipv6 = false;
2647
2648 if (!data[IFLA_VXLAN_ID])
2649 return -EINVAL;
2650
2651 vxlan->net = dev_net(dev);
2652
2653 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2654 dst->remote_vni = vni;
2655
2656 /* Unless IPv6 is explicitly requested, assume IPv4 */
2657 dst->remote_ip.sa.sa_family = AF_INET;
2658 if (data[IFLA_VXLAN_GROUP]) {
2659 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2660 } else if (data[IFLA_VXLAN_GROUP6]) {
2661 if (!IS_ENABLED(CONFIG_IPV6))
2662 return -EPFNOSUPPORT;
2663
2664 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2665 sizeof(struct in6_addr));
2666 dst->remote_ip.sa.sa_family = AF_INET6;
2667 use_ipv6 = true;
2668 }
2669
2670 if (data[IFLA_VXLAN_LOCAL]) {
2671 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2672 vxlan->saddr.sa.sa_family = AF_INET;
2673 } else if (data[IFLA_VXLAN_LOCAL6]) {
2674 if (!IS_ENABLED(CONFIG_IPV6))
2675 return -EPFNOSUPPORT;
2676
2677 /* TODO: respect scope id */
2678 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2679 sizeof(struct in6_addr));
2680 vxlan->saddr.sa.sa_family = AF_INET6;
2681 use_ipv6 = true;
2682 }
2683
2684 if (data[IFLA_VXLAN_LINK] &&
2685 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2686 struct net_device *lowerdev
2687 = __dev_get_by_index(net, dst->remote_ifindex);
2688
2689 if (!lowerdev) {
2690 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2691 return -ENODEV;
2692 }
2693
2694 #if IS_ENABLED(CONFIG_IPV6)
2695 if (use_ipv6) {
2696 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2697 if (idev && idev->cnf.disable_ipv6) {
2698 pr_info("IPv6 is disabled via sysctl\n");
2699 return -EPERM;
2700 }
2701 vxlan->flags |= VXLAN_F_IPV6;
2702 }
2703 #endif
2704
2705 if (!tb[IFLA_MTU])
2706 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2707
2708 dev->needed_headroom = lowerdev->hard_header_len +
2709 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2710 } else if (use_ipv6)
2711 vxlan->flags |= VXLAN_F_IPV6;
2712
2713 if (data[IFLA_VXLAN_TOS])
2714 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2715
2716 if (data[IFLA_VXLAN_TTL])
2717 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2718
2719 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2720 vxlan->flags |= VXLAN_F_LEARN;
2721
2722 if (data[IFLA_VXLAN_AGEING])
2723 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2724 else
2725 vxlan->age_interval = FDB_AGE_DEFAULT;
2726
2727 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2728 vxlan->flags |= VXLAN_F_PROXY;
2729
2730 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2731 vxlan->flags |= VXLAN_F_RSC;
2732
2733 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2734 vxlan->flags |= VXLAN_F_L2MISS;
2735
2736 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2737 vxlan->flags |= VXLAN_F_L3MISS;
2738
2739 if (data[IFLA_VXLAN_LIMIT])
2740 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2741
2742 if (data[IFLA_VXLAN_PORT_RANGE]) {
2743 const struct ifla_vxlan_port_range *p
2744 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2745 vxlan->port_min = ntohs(p->low);
2746 vxlan->port_max = ntohs(p->high);
2747 }
2748
2749 if (data[IFLA_VXLAN_PORT])
2750 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2751
2752 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2753 vxlan->flags |= VXLAN_F_UDP_CSUM;
2754
2755 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2756 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2757 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2758
2759 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2760 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2761 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2762
2763 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2764 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2765 vxlan->flags |= VXLAN_F_REMCSUM_TX;
2766
2767 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2768 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2769 vxlan->flags |= VXLAN_F_REMCSUM_RX;
2770
2771 if (data[IFLA_VXLAN_GBP])
2772 vxlan->flags |= VXLAN_F_GBP;
2773
2774 if (vxlan_find_vni(net, vni, use_ipv6 ? AF_INET6 : AF_INET,
2775 vxlan->dst_port, vxlan->flags)) {
2776 pr_info("duplicate VNI %u\n", vni);
2777 return -EEXIST;
2778 }
2779
2780 dev->ethtool_ops = &vxlan_ethtool_ops;
2781
2782 /* create an fdb entry for a valid default destination */
2783 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2784 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2785 &vxlan->default_dst.remote_ip,
2786 NUD_REACHABLE|NUD_PERMANENT,
2787 NLM_F_EXCL|NLM_F_CREATE,
2788 vxlan->dst_port,
2789 vxlan->default_dst.remote_vni,
2790 vxlan->default_dst.remote_ifindex,
2791 NTF_SELF);
2792 if (err)
2793 return err;
2794 }
2795
2796 err = register_netdevice(dev);
2797 if (err) {
2798 vxlan_fdb_delete_default(vxlan);
2799 return err;
2800 }
2801
2802 list_add(&vxlan->next, &vn->vxlan_list);
2803
2804 return 0;
2805 }
2806
2807 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2808 {
2809 struct vxlan_dev *vxlan = netdev_priv(dev);
2810 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2811
2812 spin_lock(&vn->sock_lock);
2813 if (!hlist_unhashed(&vxlan->hlist))
2814 hlist_del_rcu(&vxlan->hlist);
2815 spin_unlock(&vn->sock_lock);
2816
2817 list_del(&vxlan->next);
2818 unregister_netdevice_queue(dev, head);
2819 }
2820
2821 static size_t vxlan_get_size(const struct net_device *dev)
2822 {
2823
2824 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2825 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2826 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2827 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2828 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2829 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2830 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2831 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2832 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2833 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2834 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2835 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2836 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2837 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2838 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2839 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2840 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2841 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2842 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2843 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2844 0;
2845 }
2846
2847 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2848 {
2849 const struct vxlan_dev *vxlan = netdev_priv(dev);
2850 const struct vxlan_rdst *dst = &vxlan->default_dst;
2851 struct ifla_vxlan_port_range ports = {
2852 .low = htons(vxlan->port_min),
2853 .high = htons(vxlan->port_max),
2854 };
2855
2856 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2857 goto nla_put_failure;
2858
2859 if (!vxlan_addr_any(&dst->remote_ip)) {
2860 if (dst->remote_ip.sa.sa_family == AF_INET) {
2861 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2862 dst->remote_ip.sin.sin_addr.s_addr))
2863 goto nla_put_failure;
2864 #if IS_ENABLED(CONFIG_IPV6)
2865 } else {
2866 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2867 &dst->remote_ip.sin6.sin6_addr))
2868 goto nla_put_failure;
2869 #endif
2870 }
2871 }
2872
2873 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2874 goto nla_put_failure;
2875
2876 if (!vxlan_addr_any(&vxlan->saddr)) {
2877 if (vxlan->saddr.sa.sa_family == AF_INET) {
2878 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2879 vxlan->saddr.sin.sin_addr.s_addr))
2880 goto nla_put_failure;
2881 #if IS_ENABLED(CONFIG_IPV6)
2882 } else {
2883 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2884 &vxlan->saddr.sin6.sin6_addr))
2885 goto nla_put_failure;
2886 #endif
2887 }
2888 }
2889
2890 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2891 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2892 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2893 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2894 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2895 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2896 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2897 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2898 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2899 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2900 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2901 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2902 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2903 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2904 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2905 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2906 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2907 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2908 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2909 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
2910 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
2911 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
2912 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
2913 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
2914 goto nla_put_failure;
2915
2916 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2917 goto nla_put_failure;
2918
2919 if (vxlan->flags & VXLAN_F_GBP &&
2920 nla_put_flag(skb, IFLA_VXLAN_GBP))
2921 goto nla_put_failure;
2922
2923 return 0;
2924
2925 nla_put_failure:
2926 return -EMSGSIZE;
2927 }
2928
2929 static struct net *vxlan_get_link_net(const struct net_device *dev)
2930 {
2931 struct vxlan_dev *vxlan = netdev_priv(dev);
2932
2933 return vxlan->net;
2934 }
2935
2936 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2937 .kind = "vxlan",
2938 .maxtype = IFLA_VXLAN_MAX,
2939 .policy = vxlan_policy,
2940 .priv_size = sizeof(struct vxlan_dev),
2941 .setup = vxlan_setup,
2942 .validate = vxlan_validate,
2943 .newlink = vxlan_newlink,
2944 .dellink = vxlan_dellink,
2945 .get_size = vxlan_get_size,
2946 .fill_info = vxlan_fill_info,
2947 .get_link_net = vxlan_get_link_net,
2948 };
2949
2950 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2951 struct net_device *dev)
2952 {
2953 struct vxlan_dev *vxlan, *next;
2954 LIST_HEAD(list_kill);
2955
2956 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2957 struct vxlan_rdst *dst = &vxlan->default_dst;
2958
2959 /* In case we created vxlan device with carrier
2960 * and we loose the carrier due to module unload
2961 * we also need to remove vxlan device. In other
2962 * cases, it's not necessary and remote_ifindex
2963 * is 0 here, so no matches.
2964 */
2965 if (dst->remote_ifindex == dev->ifindex)
2966 vxlan_dellink(vxlan->dev, &list_kill);
2967 }
2968
2969 unregister_netdevice_many(&list_kill);
2970 }
2971
2972 static int vxlan_lowerdev_event(struct notifier_block *unused,
2973 unsigned long event, void *ptr)
2974 {
2975 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2976 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2977
2978 if (event == NETDEV_UNREGISTER)
2979 vxlan_handle_lowerdev_unregister(vn, dev);
2980
2981 return NOTIFY_DONE;
2982 }
2983
2984 static struct notifier_block vxlan_notifier_block __read_mostly = {
2985 .notifier_call = vxlan_lowerdev_event,
2986 };
2987
2988 static __net_init int vxlan_init_net(struct net *net)
2989 {
2990 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2991 unsigned int h;
2992
2993 INIT_LIST_HEAD(&vn->vxlan_list);
2994 spin_lock_init(&vn->sock_lock);
2995
2996 for (h = 0; h < PORT_HASH_SIZE; ++h)
2997 INIT_HLIST_HEAD(&vn->sock_list[h]);
2998
2999 return 0;
3000 }
3001
3002 static void __net_exit vxlan_exit_net(struct net *net)
3003 {
3004 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3005 struct vxlan_dev *vxlan, *next;
3006 struct net_device *dev, *aux;
3007 LIST_HEAD(list);
3008
3009 rtnl_lock();
3010 for_each_netdev_safe(net, dev, aux)
3011 if (dev->rtnl_link_ops == &vxlan_link_ops)
3012 unregister_netdevice_queue(dev, &list);
3013
3014 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3015 /* If vxlan->dev is in the same netns, it has already been added
3016 * to the list by the previous loop.
3017 */
3018 if (!net_eq(dev_net(vxlan->dev), net))
3019 unregister_netdevice_queue(dev, &list);
3020 }
3021
3022 unregister_netdevice_many(&list);
3023 rtnl_unlock();
3024 }
3025
3026 static struct pernet_operations vxlan_net_ops = {
3027 .init = vxlan_init_net,
3028 .exit = vxlan_exit_net,
3029 .id = &vxlan_net_id,
3030 .size = sizeof(struct vxlan_net),
3031 };
3032
3033 static int __init vxlan_init_module(void)
3034 {
3035 int rc;
3036
3037 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3038 if (!vxlan_wq)
3039 return -ENOMEM;
3040
3041 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3042
3043 rc = register_pernet_subsys(&vxlan_net_ops);
3044 if (rc)
3045 goto out1;
3046
3047 rc = register_netdevice_notifier(&vxlan_notifier_block);
3048 if (rc)
3049 goto out2;
3050
3051 rc = rtnl_link_register(&vxlan_link_ops);
3052 if (rc)
3053 goto out3;
3054
3055 return 0;
3056 out3:
3057 unregister_netdevice_notifier(&vxlan_notifier_block);
3058 out2:
3059 unregister_pernet_subsys(&vxlan_net_ops);
3060 out1:
3061 destroy_workqueue(vxlan_wq);
3062 return rc;
3063 }
3064 late_initcall(vxlan_init_module);
3065
3066 static void __exit vxlan_cleanup_module(void)
3067 {
3068 rtnl_link_unregister(&vxlan_link_ops);
3069 unregister_netdevice_notifier(&vxlan_notifier_block);
3070 destroy_workqueue(vxlan_wq);
3071 unregister_pernet_subsys(&vxlan_net_ops);
3072 /* rcu_barrier() is called by netns */
3073 }
3074 module_exit(vxlan_cleanup_module);
3075
3076 MODULE_LICENSE("GPL");
3077 MODULE_VERSION(VXLAN_VERSION);
3078 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3079 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3080 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
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