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Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[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 #include <net/dst_metadata.h>
53
54 #define VXLAN_VERSION "0.1"
55
56 #define PORT_HASH_BITS 8
57 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
58 #define FDB_AGE_DEFAULT 300 /* 5 min */
59 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
60
61 /* UDP port for VXLAN traffic.
62 * The IANA assigned port is 4789, but the Linux default is 8472
63 * for compatibility with early adopters.
64 */
65 static unsigned short vxlan_port __read_mostly = 8472;
66 module_param_named(udp_port, vxlan_port, ushort, 0444);
67 MODULE_PARM_DESC(udp_port, "Destination UDP port");
68
69 static bool log_ecn_error = true;
70 module_param(log_ecn_error, bool, 0644);
71 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
72
73 static int vxlan_net_id;
74 static struct rtnl_link_ops vxlan_link_ops;
75
76 static const u8 all_zeros_mac[ETH_ALEN];
77
78 static struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
79 bool no_share, u32 flags);
80
81 /* per-network namespace private data for this module */
82 struct vxlan_net {
83 struct list_head vxlan_list;
84 struct hlist_head sock_list[PORT_HASH_SIZE];
85 spinlock_t sock_lock;
86 };
87
88 /* Forwarding table entry */
89 struct vxlan_fdb {
90 struct hlist_node hlist; /* linked list of entries */
91 struct rcu_head rcu;
92 unsigned long updated; /* jiffies */
93 unsigned long used;
94 struct list_head remotes;
95 u8 eth_addr[ETH_ALEN];
96 u16 state; /* see ndm_state */
97 u8 flags; /* see ndm_flags */
98 };
99
100 /* salt for hash table */
101 static u32 vxlan_salt __read_mostly;
102 static struct workqueue_struct *vxlan_wq;
103
104 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
105 {
106 return vs->flags & VXLAN_F_COLLECT_METADATA ||
107 ip_tunnel_collect_metadata();
108 }
109
110 #if IS_ENABLED(CONFIG_IPV6)
111 static inline
112 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
113 {
114 if (a->sa.sa_family != b->sa.sa_family)
115 return false;
116 if (a->sa.sa_family == AF_INET6)
117 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
118 else
119 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
120 }
121
122 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
123 {
124 if (ipa->sa.sa_family == AF_INET6)
125 return ipv6_addr_any(&ipa->sin6.sin6_addr);
126 else
127 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
128 }
129
130 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
131 {
132 if (ipa->sa.sa_family == AF_INET6)
133 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
134 else
135 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
136 }
137
138 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
139 {
140 if (nla_len(nla) >= sizeof(struct in6_addr)) {
141 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
142 ip->sa.sa_family = AF_INET6;
143 return 0;
144 } else if (nla_len(nla) >= sizeof(__be32)) {
145 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
146 ip->sa.sa_family = AF_INET;
147 return 0;
148 } else {
149 return -EAFNOSUPPORT;
150 }
151 }
152
153 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
154 const union vxlan_addr *ip)
155 {
156 if (ip->sa.sa_family == AF_INET6)
157 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
158 else
159 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
160 }
161
162 #else /* !CONFIG_IPV6 */
163
164 static inline
165 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
166 {
167 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
168 }
169
170 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
171 {
172 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
173 }
174
175 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
176 {
177 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
178 }
179
180 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
181 {
182 if (nla_len(nla) >= sizeof(struct in6_addr)) {
183 return -EAFNOSUPPORT;
184 } else if (nla_len(nla) >= sizeof(__be32)) {
185 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
186 ip->sa.sa_family = AF_INET;
187 return 0;
188 } else {
189 return -EAFNOSUPPORT;
190 }
191 }
192
193 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
194 const union vxlan_addr *ip)
195 {
196 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
197 }
198 #endif
199
200 /* Virtual Network hash table head */
201 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
202 {
203 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
204 }
205
206 /* Socket hash table head */
207 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
208 {
209 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
210
211 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
212 }
213
214 /* First remote destination for a forwarding entry.
215 * Guaranteed to be non-NULL because remotes are never deleted.
216 */
217 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
218 {
219 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
220 }
221
222 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
223 {
224 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
225 }
226
227 /* Find VXLAN socket based on network namespace, address family and UDP port
228 * and enabled unshareable flags.
229 */
230 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
231 __be16 port, u32 flags)
232 {
233 struct vxlan_sock *vs;
234
235 flags &= VXLAN_F_RCV_FLAGS;
236
237 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
238 if (inet_sk(vs->sock->sk)->inet_sport == port &&
239 vxlan_get_sk_family(vs) == family &&
240 vs->flags == flags)
241 return vs;
242 }
243 return NULL;
244 }
245
246 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
247 {
248 struct vxlan_dev *vxlan;
249
250 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
251 if (vxlan->default_dst.remote_vni == id)
252 return vxlan;
253 }
254
255 return NULL;
256 }
257
258 /* Look up VNI in a per net namespace table */
259 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
260 sa_family_t family, __be16 port,
261 u32 flags)
262 {
263 struct vxlan_sock *vs;
264
265 vs = vxlan_find_sock(net, family, port, flags);
266 if (!vs)
267 return NULL;
268
269 return vxlan_vs_find_vni(vs, id);
270 }
271
272 /* Fill in neighbour message in skbuff. */
273 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
274 const struct vxlan_fdb *fdb,
275 u32 portid, u32 seq, int type, unsigned int flags,
276 const struct vxlan_rdst *rdst)
277 {
278 unsigned long now = jiffies;
279 struct nda_cacheinfo ci;
280 struct nlmsghdr *nlh;
281 struct ndmsg *ndm;
282 bool send_ip, send_eth;
283
284 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
285 if (nlh == NULL)
286 return -EMSGSIZE;
287
288 ndm = nlmsg_data(nlh);
289 memset(ndm, 0, sizeof(*ndm));
290
291 send_eth = send_ip = true;
292
293 if (type == RTM_GETNEIGH) {
294 ndm->ndm_family = AF_INET;
295 send_ip = !vxlan_addr_any(&rdst->remote_ip);
296 send_eth = !is_zero_ether_addr(fdb->eth_addr);
297 } else
298 ndm->ndm_family = AF_BRIDGE;
299 ndm->ndm_state = fdb->state;
300 ndm->ndm_ifindex = vxlan->dev->ifindex;
301 ndm->ndm_flags = fdb->flags;
302 ndm->ndm_type = RTN_UNICAST;
303
304 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
305 nla_put_s32(skb, NDA_LINK_NETNSID,
306 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
307 goto nla_put_failure;
308
309 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
310 goto nla_put_failure;
311
312 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
313 goto nla_put_failure;
314
315 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
316 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
317 goto nla_put_failure;
318 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
319 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
320 goto nla_put_failure;
321 if (rdst->remote_ifindex &&
322 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
323 goto nla_put_failure;
324
325 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
326 ci.ndm_confirmed = 0;
327 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
328 ci.ndm_refcnt = 0;
329
330 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
331 goto nla_put_failure;
332
333 nlmsg_end(skb, nlh);
334 return 0;
335
336 nla_put_failure:
337 nlmsg_cancel(skb, nlh);
338 return -EMSGSIZE;
339 }
340
341 static inline size_t vxlan_nlmsg_size(void)
342 {
343 return NLMSG_ALIGN(sizeof(struct ndmsg))
344 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
345 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
346 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
347 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
348 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
349 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
350 + nla_total_size(sizeof(struct nda_cacheinfo));
351 }
352
353 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
354 struct vxlan_rdst *rd, int type)
355 {
356 struct net *net = dev_net(vxlan->dev);
357 struct sk_buff *skb;
358 int err = -ENOBUFS;
359
360 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
361 if (skb == NULL)
362 goto errout;
363
364 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
365 if (err < 0) {
366 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
367 WARN_ON(err == -EMSGSIZE);
368 kfree_skb(skb);
369 goto errout;
370 }
371
372 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
373 return;
374 errout:
375 if (err < 0)
376 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
377 }
378
379 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
380 {
381 struct vxlan_dev *vxlan = netdev_priv(dev);
382 struct vxlan_fdb f = {
383 .state = NUD_STALE,
384 };
385 struct vxlan_rdst remote = {
386 .remote_ip = *ipa, /* goes to NDA_DST */
387 .remote_vni = VXLAN_N_VID,
388 };
389
390 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
391 }
392
393 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
394 {
395 struct vxlan_fdb f = {
396 .state = NUD_STALE,
397 };
398 struct vxlan_rdst remote = { };
399
400 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
401
402 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
403 }
404
405 /* Hash Ethernet address */
406 static u32 eth_hash(const unsigned char *addr)
407 {
408 u64 value = get_unaligned((u64 *)addr);
409
410 /* only want 6 bytes */
411 #ifdef __BIG_ENDIAN
412 value >>= 16;
413 #else
414 value <<= 16;
415 #endif
416 return hash_64(value, FDB_HASH_BITS);
417 }
418
419 /* Hash chain to use given mac address */
420 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
421 const u8 *mac)
422 {
423 return &vxlan->fdb_head[eth_hash(mac)];
424 }
425
426 /* Look up Ethernet address in forwarding table */
427 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
428 const u8 *mac)
429 {
430 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
431 struct vxlan_fdb *f;
432
433 hlist_for_each_entry_rcu(f, head, hlist) {
434 if (ether_addr_equal(mac, f->eth_addr))
435 return f;
436 }
437
438 return NULL;
439 }
440
441 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
442 const u8 *mac)
443 {
444 struct vxlan_fdb *f;
445
446 f = __vxlan_find_mac(vxlan, mac);
447 if (f)
448 f->used = jiffies;
449
450 return f;
451 }
452
453 /* caller should hold vxlan->hash_lock */
454 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
455 union vxlan_addr *ip, __be16 port,
456 __u32 vni, __u32 ifindex)
457 {
458 struct vxlan_rdst *rd;
459
460 list_for_each_entry(rd, &f->remotes, list) {
461 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
462 rd->remote_port == port &&
463 rd->remote_vni == vni &&
464 rd->remote_ifindex == ifindex)
465 return rd;
466 }
467
468 return NULL;
469 }
470
471 /* Replace destination of unicast mac */
472 static int vxlan_fdb_replace(struct vxlan_fdb *f,
473 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
474 {
475 struct vxlan_rdst *rd;
476
477 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
478 if (rd)
479 return 0;
480
481 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
482 if (!rd)
483 return 0;
484 rd->remote_ip = *ip;
485 rd->remote_port = port;
486 rd->remote_vni = vni;
487 rd->remote_ifindex = ifindex;
488 return 1;
489 }
490
491 /* Add/update destinations for multicast */
492 static int vxlan_fdb_append(struct vxlan_fdb *f,
493 union vxlan_addr *ip, __be16 port, __u32 vni,
494 __u32 ifindex, struct vxlan_rdst **rdp)
495 {
496 struct vxlan_rdst *rd;
497
498 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
499 if (rd)
500 return 0;
501
502 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
503 if (rd == NULL)
504 return -ENOBUFS;
505 rd->remote_ip = *ip;
506 rd->remote_port = port;
507 rd->remote_vni = vni;
508 rd->remote_ifindex = ifindex;
509
510 list_add_tail_rcu(&rd->list, &f->remotes);
511
512 *rdp = rd;
513 return 1;
514 }
515
516 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
517 unsigned int off,
518 struct vxlanhdr *vh, size_t hdrlen,
519 u32 data, struct gro_remcsum *grc,
520 bool nopartial)
521 {
522 size_t start, offset;
523
524 if (skb->remcsum_offload)
525 return vh;
526
527 if (!NAPI_GRO_CB(skb)->csum_valid)
528 return NULL;
529
530 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
531 offset = start + ((data & VXLAN_RCO_UDP) ?
532 offsetof(struct udphdr, check) :
533 offsetof(struct tcphdr, check));
534
535 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
536 start, offset, grc, nopartial);
537
538 skb->remcsum_offload = 1;
539
540 return vh;
541 }
542
543 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
544 struct sk_buff *skb,
545 struct udp_offload *uoff)
546 {
547 struct sk_buff *p, **pp = NULL;
548 struct vxlanhdr *vh, *vh2;
549 unsigned int hlen, off_vx;
550 int flush = 1;
551 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
552 udp_offloads);
553 u32 flags;
554 struct gro_remcsum grc;
555
556 skb_gro_remcsum_init(&grc);
557
558 off_vx = skb_gro_offset(skb);
559 hlen = off_vx + sizeof(*vh);
560 vh = skb_gro_header_fast(skb, off_vx);
561 if (skb_gro_header_hard(skb, hlen)) {
562 vh = skb_gro_header_slow(skb, hlen, off_vx);
563 if (unlikely(!vh))
564 goto out;
565 }
566
567 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
568
569 flags = ntohl(vh->vx_flags);
570
571 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
572 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
573 ntohl(vh->vx_vni), &grc,
574 !!(vs->flags &
575 VXLAN_F_REMCSUM_NOPARTIAL));
576
577 if (!vh)
578 goto out;
579 }
580
581 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
582
583 flush = 0;
584
585 for (p = *head; p; p = p->next) {
586 if (!NAPI_GRO_CB(p)->same_flow)
587 continue;
588
589 vh2 = (struct vxlanhdr *)(p->data + off_vx);
590 if (vh->vx_flags != vh2->vx_flags ||
591 vh->vx_vni != vh2->vx_vni) {
592 NAPI_GRO_CB(p)->same_flow = 0;
593 continue;
594 }
595 }
596
597 pp = eth_gro_receive(head, skb);
598
599 out:
600 skb_gro_remcsum_cleanup(skb, &grc);
601 NAPI_GRO_CB(skb)->flush |= flush;
602
603 return pp;
604 }
605
606 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
607 struct udp_offload *uoff)
608 {
609 udp_tunnel_gro_complete(skb, nhoff);
610
611 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
612 }
613
614 /* Notify netdevs that UDP port started listening */
615 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
616 {
617 struct net_device *dev;
618 struct sock *sk = vs->sock->sk;
619 struct net *net = sock_net(sk);
620 sa_family_t sa_family = vxlan_get_sk_family(vs);
621 __be16 port = inet_sk(sk)->inet_sport;
622 int err;
623
624 if (sa_family == AF_INET) {
625 err = udp_add_offload(&vs->udp_offloads);
626 if (err)
627 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
628 }
629
630 rcu_read_lock();
631 for_each_netdev_rcu(net, dev) {
632 if (dev->netdev_ops->ndo_add_vxlan_port)
633 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
634 port);
635 }
636 rcu_read_unlock();
637 }
638
639 /* Notify netdevs that UDP port is no more listening */
640 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
641 {
642 struct net_device *dev;
643 struct sock *sk = vs->sock->sk;
644 struct net *net = sock_net(sk);
645 sa_family_t sa_family = vxlan_get_sk_family(vs);
646 __be16 port = inet_sk(sk)->inet_sport;
647
648 rcu_read_lock();
649 for_each_netdev_rcu(net, dev) {
650 if (dev->netdev_ops->ndo_del_vxlan_port)
651 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
652 port);
653 }
654 rcu_read_unlock();
655
656 if (sa_family == AF_INET)
657 udp_del_offload(&vs->udp_offloads);
658 }
659
660 /* Add new entry to forwarding table -- assumes lock held */
661 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
662 const u8 *mac, union vxlan_addr *ip,
663 __u16 state, __u16 flags,
664 __be16 port, __u32 vni, __u32 ifindex,
665 __u8 ndm_flags)
666 {
667 struct vxlan_rdst *rd = NULL;
668 struct vxlan_fdb *f;
669 int notify = 0;
670
671 f = __vxlan_find_mac(vxlan, mac);
672 if (f) {
673 if (flags & NLM_F_EXCL) {
674 netdev_dbg(vxlan->dev,
675 "lost race to create %pM\n", mac);
676 return -EEXIST;
677 }
678 if (f->state != state) {
679 f->state = state;
680 f->updated = jiffies;
681 notify = 1;
682 }
683 if (f->flags != ndm_flags) {
684 f->flags = ndm_flags;
685 f->updated = jiffies;
686 notify = 1;
687 }
688 if ((flags & NLM_F_REPLACE)) {
689 /* Only change unicasts */
690 if (!(is_multicast_ether_addr(f->eth_addr) ||
691 is_zero_ether_addr(f->eth_addr))) {
692 notify |= vxlan_fdb_replace(f, ip, port, vni,
693 ifindex);
694 } else
695 return -EOPNOTSUPP;
696 }
697 if ((flags & NLM_F_APPEND) &&
698 (is_multicast_ether_addr(f->eth_addr) ||
699 is_zero_ether_addr(f->eth_addr))) {
700 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
701 &rd);
702
703 if (rc < 0)
704 return rc;
705 notify |= rc;
706 }
707 } else {
708 if (!(flags & NLM_F_CREATE))
709 return -ENOENT;
710
711 if (vxlan->cfg.addrmax &&
712 vxlan->addrcnt >= vxlan->cfg.addrmax)
713 return -ENOSPC;
714
715 /* Disallow replace to add a multicast entry */
716 if ((flags & NLM_F_REPLACE) &&
717 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
718 return -EOPNOTSUPP;
719
720 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
721 f = kmalloc(sizeof(*f), GFP_ATOMIC);
722 if (!f)
723 return -ENOMEM;
724
725 notify = 1;
726 f->state = state;
727 f->flags = ndm_flags;
728 f->updated = f->used = jiffies;
729 INIT_LIST_HEAD(&f->remotes);
730 memcpy(f->eth_addr, mac, ETH_ALEN);
731
732 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
733
734 ++vxlan->addrcnt;
735 hlist_add_head_rcu(&f->hlist,
736 vxlan_fdb_head(vxlan, mac));
737 }
738
739 if (notify) {
740 if (rd == NULL)
741 rd = first_remote_rtnl(f);
742 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
743 }
744
745 return 0;
746 }
747
748 static void vxlan_fdb_free(struct rcu_head *head)
749 {
750 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
751 struct vxlan_rdst *rd, *nd;
752
753 list_for_each_entry_safe(rd, nd, &f->remotes, list)
754 kfree(rd);
755 kfree(f);
756 }
757
758 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
759 {
760 netdev_dbg(vxlan->dev,
761 "delete %pM\n", f->eth_addr);
762
763 --vxlan->addrcnt;
764 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
765
766 hlist_del_rcu(&f->hlist);
767 call_rcu(&f->rcu, vxlan_fdb_free);
768 }
769
770 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
771 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
772 {
773 struct net *net = dev_net(vxlan->dev);
774 int err;
775
776 if (tb[NDA_DST]) {
777 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
778 if (err)
779 return err;
780 } else {
781 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
782 if (remote->sa.sa_family == AF_INET) {
783 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
784 ip->sa.sa_family = AF_INET;
785 #if IS_ENABLED(CONFIG_IPV6)
786 } else {
787 ip->sin6.sin6_addr = in6addr_any;
788 ip->sa.sa_family = AF_INET6;
789 #endif
790 }
791 }
792
793 if (tb[NDA_PORT]) {
794 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
795 return -EINVAL;
796 *port = nla_get_be16(tb[NDA_PORT]);
797 } else {
798 *port = vxlan->cfg.dst_port;
799 }
800
801 if (tb[NDA_VNI]) {
802 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
803 return -EINVAL;
804 *vni = nla_get_u32(tb[NDA_VNI]);
805 } else {
806 *vni = vxlan->default_dst.remote_vni;
807 }
808
809 if (tb[NDA_IFINDEX]) {
810 struct net_device *tdev;
811
812 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
813 return -EINVAL;
814 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
815 tdev = __dev_get_by_index(net, *ifindex);
816 if (!tdev)
817 return -EADDRNOTAVAIL;
818 } else {
819 *ifindex = 0;
820 }
821
822 return 0;
823 }
824
825 /* Add static entry (via netlink) */
826 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
827 struct net_device *dev,
828 const unsigned char *addr, u16 vid, u16 flags)
829 {
830 struct vxlan_dev *vxlan = netdev_priv(dev);
831 /* struct net *net = dev_net(vxlan->dev); */
832 union vxlan_addr ip;
833 __be16 port;
834 u32 vni, ifindex;
835 int err;
836
837 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
838 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
839 ndm->ndm_state);
840 return -EINVAL;
841 }
842
843 if (tb[NDA_DST] == NULL)
844 return -EINVAL;
845
846 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
847 if (err)
848 return err;
849
850 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
851 return -EAFNOSUPPORT;
852
853 spin_lock_bh(&vxlan->hash_lock);
854 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
855 port, vni, ifindex, ndm->ndm_flags);
856 spin_unlock_bh(&vxlan->hash_lock);
857
858 return err;
859 }
860
861 /* Delete entry (via netlink) */
862 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
863 struct net_device *dev,
864 const unsigned char *addr, u16 vid)
865 {
866 struct vxlan_dev *vxlan = netdev_priv(dev);
867 struct vxlan_fdb *f;
868 struct vxlan_rdst *rd = NULL;
869 union vxlan_addr ip;
870 __be16 port;
871 u32 vni, ifindex;
872 int err;
873
874 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
875 if (err)
876 return err;
877
878 err = -ENOENT;
879
880 spin_lock_bh(&vxlan->hash_lock);
881 f = vxlan_find_mac(vxlan, addr);
882 if (!f)
883 goto out;
884
885 if (!vxlan_addr_any(&ip)) {
886 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
887 if (!rd)
888 goto out;
889 }
890
891 err = 0;
892
893 /* remove a destination if it's not the only one on the list,
894 * otherwise destroy the fdb entry
895 */
896 if (rd && !list_is_singular(&f->remotes)) {
897 list_del_rcu(&rd->list);
898 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
899 kfree_rcu(rd, rcu);
900 goto out;
901 }
902
903 vxlan_fdb_destroy(vxlan, f);
904
905 out:
906 spin_unlock_bh(&vxlan->hash_lock);
907
908 return err;
909 }
910
911 /* Dump forwarding table */
912 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
913 struct net_device *dev,
914 struct net_device *filter_dev, int idx)
915 {
916 struct vxlan_dev *vxlan = netdev_priv(dev);
917 unsigned int h;
918
919 for (h = 0; h < FDB_HASH_SIZE; ++h) {
920 struct vxlan_fdb *f;
921 int err;
922
923 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
924 struct vxlan_rdst *rd;
925
926 list_for_each_entry_rcu(rd, &f->remotes, list) {
927 if (idx < cb->args[0])
928 goto skip;
929
930 err = vxlan_fdb_info(skb, vxlan, f,
931 NETLINK_CB(cb->skb).portid,
932 cb->nlh->nlmsg_seq,
933 RTM_NEWNEIGH,
934 NLM_F_MULTI, rd);
935 if (err < 0)
936 goto out;
937 skip:
938 ++idx;
939 }
940 }
941 }
942 out:
943 return idx;
944 }
945
946 /* Watch incoming packets to learn mapping between Ethernet address
947 * and Tunnel endpoint.
948 * Return true if packet is bogus and should be dropped.
949 */
950 static bool vxlan_snoop(struct net_device *dev,
951 union vxlan_addr *src_ip, const u8 *src_mac)
952 {
953 struct vxlan_dev *vxlan = netdev_priv(dev);
954 struct vxlan_fdb *f;
955
956 f = vxlan_find_mac(vxlan, src_mac);
957 if (likely(f)) {
958 struct vxlan_rdst *rdst = first_remote_rcu(f);
959
960 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
961 return false;
962
963 /* Don't migrate static entries, drop packets */
964 if (f->state & NUD_NOARP)
965 return true;
966
967 if (net_ratelimit())
968 netdev_info(dev,
969 "%pM migrated from %pIS to %pIS\n",
970 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
971
972 rdst->remote_ip = *src_ip;
973 f->updated = jiffies;
974 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
975 } else {
976 /* learned new entry */
977 spin_lock(&vxlan->hash_lock);
978
979 /* close off race between vxlan_flush and incoming packets */
980 if (netif_running(dev))
981 vxlan_fdb_create(vxlan, src_mac, src_ip,
982 NUD_REACHABLE,
983 NLM_F_EXCL|NLM_F_CREATE,
984 vxlan->cfg.dst_port,
985 vxlan->default_dst.remote_vni,
986 0, NTF_SELF);
987 spin_unlock(&vxlan->hash_lock);
988 }
989
990 return false;
991 }
992
993 /* See if multicast group is already in use by other ID */
994 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
995 {
996 struct vxlan_dev *vxlan;
997
998 /* The vxlan_sock is only used by dev, leaving group has
999 * no effect on other vxlan devices.
1000 */
1001 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1002 return false;
1003
1004 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1005 if (!netif_running(vxlan->dev) || vxlan == dev)
1006 continue;
1007
1008 if (vxlan->vn_sock != dev->vn_sock)
1009 continue;
1010
1011 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1012 &dev->default_dst.remote_ip))
1013 continue;
1014
1015 if (vxlan->default_dst.remote_ifindex !=
1016 dev->default_dst.remote_ifindex)
1017 continue;
1018
1019 return true;
1020 }
1021
1022 return false;
1023 }
1024
1025 static void vxlan_sock_release(struct vxlan_sock *vs)
1026 {
1027 struct sock *sk = vs->sock->sk;
1028 struct net *net = sock_net(sk);
1029 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1030
1031 if (!atomic_dec_and_test(&vs->refcnt))
1032 return;
1033
1034 spin_lock(&vn->sock_lock);
1035 hlist_del_rcu(&vs->hlist);
1036 vxlan_notify_del_rx_port(vs);
1037 spin_unlock(&vn->sock_lock);
1038
1039 queue_work(vxlan_wq, &vs->del_work);
1040 }
1041
1042 /* Update multicast group membership when first VNI on
1043 * multicast address is brought up
1044 */
1045 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1046 {
1047 struct vxlan_sock *vs = vxlan->vn_sock;
1048 struct sock *sk = vs->sock->sk;
1049 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1050 int ifindex = vxlan->default_dst.remote_ifindex;
1051 int ret = -EINVAL;
1052
1053 lock_sock(sk);
1054 if (ip->sa.sa_family == AF_INET) {
1055 struct ip_mreqn mreq = {
1056 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1057 .imr_ifindex = ifindex,
1058 };
1059
1060 ret = ip_mc_join_group(sk, &mreq);
1061 #if IS_ENABLED(CONFIG_IPV6)
1062 } else {
1063 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1064 &ip->sin6.sin6_addr);
1065 #endif
1066 }
1067 release_sock(sk);
1068
1069 return ret;
1070 }
1071
1072 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1073 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1074 {
1075 struct vxlan_sock *vs = vxlan->vn_sock;
1076 struct sock *sk = vs->sock->sk;
1077 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1078 int ifindex = vxlan->default_dst.remote_ifindex;
1079 int ret = -EINVAL;
1080
1081 lock_sock(sk);
1082 if (ip->sa.sa_family == AF_INET) {
1083 struct ip_mreqn mreq = {
1084 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1085 .imr_ifindex = ifindex,
1086 };
1087
1088 ret = ip_mc_leave_group(sk, &mreq);
1089 #if IS_ENABLED(CONFIG_IPV6)
1090 } else {
1091 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1092 &ip->sin6.sin6_addr);
1093 #endif
1094 }
1095 release_sock(sk);
1096
1097 return ret;
1098 }
1099
1100 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1101 size_t hdrlen, u32 data, bool nopartial)
1102 {
1103 size_t start, offset, plen;
1104
1105 if (skb->remcsum_offload)
1106 return vh;
1107
1108 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1109 offset = start + ((data & VXLAN_RCO_UDP) ?
1110 offsetof(struct udphdr, check) :
1111 offsetof(struct tcphdr, check));
1112
1113 plen = hdrlen + offset + sizeof(u16);
1114
1115 if (!pskb_may_pull(skb, plen))
1116 return NULL;
1117
1118 vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1119
1120 skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1121 nopartial);
1122
1123 return vh;
1124 }
1125
1126 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1127 struct vxlan_metadata *md, u32 vni,
1128 struct metadata_dst *tun_dst)
1129 {
1130 struct iphdr *oip = NULL;
1131 struct ipv6hdr *oip6 = NULL;
1132 struct vxlan_dev *vxlan;
1133 struct pcpu_sw_netstats *stats;
1134 union vxlan_addr saddr;
1135 int err = 0;
1136 union vxlan_addr *remote_ip;
1137
1138 /* For flow based devices, map all packets to VNI 0 */
1139 if (vs->flags & VXLAN_F_COLLECT_METADATA)
1140 vni = 0;
1141
1142 /* Is this VNI defined? */
1143 vxlan = vxlan_vs_find_vni(vs, vni);
1144 if (!vxlan)
1145 goto drop;
1146
1147 remote_ip = &vxlan->default_dst.remote_ip;
1148 skb_reset_mac_header(skb);
1149 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1150 skb->protocol = eth_type_trans(skb, vxlan->dev);
1151 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1152
1153 /* Ignore packet loops (and multicast echo) */
1154 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1155 goto drop;
1156
1157 /* Re-examine inner Ethernet packet */
1158 if (remote_ip->sa.sa_family == AF_INET) {
1159 oip = ip_hdr(skb);
1160 saddr.sin.sin_addr.s_addr = oip->saddr;
1161 saddr.sa.sa_family = AF_INET;
1162 #if IS_ENABLED(CONFIG_IPV6)
1163 } else {
1164 oip6 = ipv6_hdr(skb);
1165 saddr.sin6.sin6_addr = oip6->saddr;
1166 saddr.sa.sa_family = AF_INET6;
1167 #endif
1168 }
1169
1170 if (tun_dst) {
1171 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1172 tun_dst = NULL;
1173 }
1174
1175 if ((vxlan->flags & VXLAN_F_LEARN) &&
1176 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1177 goto drop;
1178
1179 skb_reset_network_header(skb);
1180 /* In flow-based mode, GBP is carried in dst_metadata */
1181 if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1182 skb->mark = md->gbp;
1183
1184 if (oip6)
1185 err = IP6_ECN_decapsulate(oip6, skb);
1186 if (oip)
1187 err = IP_ECN_decapsulate(oip, skb);
1188
1189 if (unlikely(err)) {
1190 if (log_ecn_error) {
1191 if (oip6)
1192 net_info_ratelimited("non-ECT from %pI6\n",
1193 &oip6->saddr);
1194 if (oip)
1195 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1196 &oip->saddr, oip->tos);
1197 }
1198 if (err > 1) {
1199 ++vxlan->dev->stats.rx_frame_errors;
1200 ++vxlan->dev->stats.rx_errors;
1201 goto drop;
1202 }
1203 }
1204
1205 stats = this_cpu_ptr(vxlan->dev->tstats);
1206 u64_stats_update_begin(&stats->syncp);
1207 stats->rx_packets++;
1208 stats->rx_bytes += skb->len;
1209 u64_stats_update_end(&stats->syncp);
1210
1211 gro_cells_receive(&vxlan->gro_cells, skb);
1212
1213 return;
1214 drop:
1215 if (tun_dst)
1216 dst_release((struct dst_entry *)tun_dst);
1217
1218 /* Consume bad packet */
1219 kfree_skb(skb);
1220 }
1221
1222 /* Callback from net/ipv4/udp.c to receive packets */
1223 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1224 {
1225 struct metadata_dst *tun_dst = NULL;
1226 struct vxlan_sock *vs;
1227 struct vxlanhdr *vxh;
1228 u32 flags, vni;
1229 struct vxlan_metadata _md;
1230 struct vxlan_metadata *md = &_md;
1231
1232 /* Need Vxlan and inner Ethernet header to be present */
1233 if (!pskb_may_pull(skb, VXLAN_HLEN))
1234 goto error;
1235
1236 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1237 flags = ntohl(vxh->vx_flags);
1238 vni = ntohl(vxh->vx_vni);
1239
1240 if (flags & VXLAN_HF_VNI) {
1241 flags &= ~VXLAN_HF_VNI;
1242 } else {
1243 /* VNI flag always required to be set */
1244 goto bad_flags;
1245 }
1246
1247 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1248 goto drop;
1249 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1250
1251 vs = rcu_dereference_sk_user_data(sk);
1252 if (!vs)
1253 goto drop;
1254
1255 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1256 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1257 !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1258 if (!vxh)
1259 goto drop;
1260
1261 flags &= ~VXLAN_HF_RCO;
1262 vni &= VXLAN_VNI_MASK;
1263 }
1264
1265 if (vxlan_collect_metadata(vs)) {
1266 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1267 cpu_to_be64(vni >> 8), sizeof(*md));
1268
1269 if (!tun_dst)
1270 goto drop;
1271
1272 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1273 } else {
1274 memset(md, 0, sizeof(*md));
1275 }
1276
1277 /* For backwards compatibility, only allow reserved fields to be
1278 * used by VXLAN extensions if explicitly requested.
1279 */
1280 if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1281 struct vxlanhdr_gbp *gbp;
1282
1283 gbp = (struct vxlanhdr_gbp *)vxh;
1284 md->gbp = ntohs(gbp->policy_id);
1285
1286 if (tun_dst)
1287 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1288
1289 if (gbp->dont_learn)
1290 md->gbp |= VXLAN_GBP_DONT_LEARN;
1291
1292 if (gbp->policy_applied)
1293 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1294
1295 flags &= ~VXLAN_GBP_USED_BITS;
1296 }
1297
1298 if (flags || vni & ~VXLAN_VNI_MASK) {
1299 /* If there are any unprocessed flags remaining treat
1300 * this as a malformed packet. This behavior diverges from
1301 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1302 * in reserved fields are to be ignored. The approach here
1303 * maintains compatibility with previous stack code, and also
1304 * is more robust and provides a little more security in
1305 * adding extensions to VXLAN.
1306 */
1307
1308 goto bad_flags;
1309 }
1310
1311 vxlan_rcv(vs, skb, md, vni >> 8, tun_dst);
1312 return 0;
1313
1314 drop:
1315 /* Consume bad packet */
1316 kfree_skb(skb);
1317 return 0;
1318
1319 bad_flags:
1320 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1321 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1322
1323 error:
1324 if (tun_dst)
1325 dst_release((struct dst_entry *)tun_dst);
1326
1327 /* Return non vxlan pkt */
1328 return 1;
1329 }
1330
1331 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1332 {
1333 struct vxlan_dev *vxlan = netdev_priv(dev);
1334 struct arphdr *parp;
1335 u8 *arpptr, *sha;
1336 __be32 sip, tip;
1337 struct neighbour *n;
1338
1339 if (dev->flags & IFF_NOARP)
1340 goto out;
1341
1342 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1343 dev->stats.tx_dropped++;
1344 goto out;
1345 }
1346 parp = arp_hdr(skb);
1347
1348 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1349 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1350 parp->ar_pro != htons(ETH_P_IP) ||
1351 parp->ar_op != htons(ARPOP_REQUEST) ||
1352 parp->ar_hln != dev->addr_len ||
1353 parp->ar_pln != 4)
1354 goto out;
1355 arpptr = (u8 *)parp + sizeof(struct arphdr);
1356 sha = arpptr;
1357 arpptr += dev->addr_len; /* sha */
1358 memcpy(&sip, arpptr, sizeof(sip));
1359 arpptr += sizeof(sip);
1360 arpptr += dev->addr_len; /* tha */
1361 memcpy(&tip, arpptr, sizeof(tip));
1362
1363 if (ipv4_is_loopback(tip) ||
1364 ipv4_is_multicast(tip))
1365 goto out;
1366
1367 n = neigh_lookup(&arp_tbl, &tip, dev);
1368
1369 if (n) {
1370 struct vxlan_fdb *f;
1371 struct sk_buff *reply;
1372
1373 if (!(n->nud_state & NUD_CONNECTED)) {
1374 neigh_release(n);
1375 goto out;
1376 }
1377
1378 f = vxlan_find_mac(vxlan, n->ha);
1379 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1380 /* bridge-local neighbor */
1381 neigh_release(n);
1382 goto out;
1383 }
1384
1385 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1386 n->ha, sha);
1387
1388 neigh_release(n);
1389
1390 if (reply == NULL)
1391 goto out;
1392
1393 skb_reset_mac_header(reply);
1394 __skb_pull(reply, skb_network_offset(reply));
1395 reply->ip_summed = CHECKSUM_UNNECESSARY;
1396 reply->pkt_type = PACKET_HOST;
1397
1398 if (netif_rx_ni(reply) == NET_RX_DROP)
1399 dev->stats.rx_dropped++;
1400 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1401 union vxlan_addr ipa = {
1402 .sin.sin_addr.s_addr = tip,
1403 .sin.sin_family = AF_INET,
1404 };
1405
1406 vxlan_ip_miss(dev, &ipa);
1407 }
1408 out:
1409 consume_skb(skb);
1410 return NETDEV_TX_OK;
1411 }
1412
1413 #if IS_ENABLED(CONFIG_IPV6)
1414 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1415 struct neighbour *n, bool isrouter)
1416 {
1417 struct net_device *dev = request->dev;
1418 struct sk_buff *reply;
1419 struct nd_msg *ns, *na;
1420 struct ipv6hdr *pip6;
1421 u8 *daddr;
1422 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1423 int ns_olen;
1424 int i, len;
1425
1426 if (dev == NULL)
1427 return NULL;
1428
1429 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1430 sizeof(*na) + na_olen + dev->needed_tailroom;
1431 reply = alloc_skb(len, GFP_ATOMIC);
1432 if (reply == NULL)
1433 return NULL;
1434
1435 reply->protocol = htons(ETH_P_IPV6);
1436 reply->dev = dev;
1437 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1438 skb_push(reply, sizeof(struct ethhdr));
1439 skb_set_mac_header(reply, 0);
1440
1441 ns = (struct nd_msg *)skb_transport_header(request);
1442
1443 daddr = eth_hdr(request)->h_source;
1444 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1445 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1446 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1447 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1448 break;
1449 }
1450 }
1451
1452 /* Ethernet header */
1453 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1454 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1455 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1456 reply->protocol = htons(ETH_P_IPV6);
1457
1458 skb_pull(reply, sizeof(struct ethhdr));
1459 skb_set_network_header(reply, 0);
1460 skb_put(reply, sizeof(struct ipv6hdr));
1461
1462 /* IPv6 header */
1463
1464 pip6 = ipv6_hdr(reply);
1465 memset(pip6, 0, sizeof(struct ipv6hdr));
1466 pip6->version = 6;
1467 pip6->priority = ipv6_hdr(request)->priority;
1468 pip6->nexthdr = IPPROTO_ICMPV6;
1469 pip6->hop_limit = 255;
1470 pip6->daddr = ipv6_hdr(request)->saddr;
1471 pip6->saddr = *(struct in6_addr *)n->primary_key;
1472
1473 skb_pull(reply, sizeof(struct ipv6hdr));
1474 skb_set_transport_header(reply, 0);
1475
1476 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1477
1478 /* Neighbor Advertisement */
1479 memset(na, 0, sizeof(*na)+na_olen);
1480 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1481 na->icmph.icmp6_router = isrouter;
1482 na->icmph.icmp6_override = 1;
1483 na->icmph.icmp6_solicited = 1;
1484 na->target = ns->target;
1485 ether_addr_copy(&na->opt[2], n->ha);
1486 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1487 na->opt[1] = na_olen >> 3;
1488
1489 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1490 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1491 csum_partial(na, sizeof(*na)+na_olen, 0));
1492
1493 pip6->payload_len = htons(sizeof(*na)+na_olen);
1494
1495 skb_push(reply, sizeof(struct ipv6hdr));
1496
1497 reply->ip_summed = CHECKSUM_UNNECESSARY;
1498
1499 return reply;
1500 }
1501
1502 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1503 {
1504 struct vxlan_dev *vxlan = netdev_priv(dev);
1505 struct nd_msg *msg;
1506 const struct ipv6hdr *iphdr;
1507 const struct in6_addr *saddr, *daddr;
1508 struct neighbour *n;
1509 struct inet6_dev *in6_dev;
1510
1511 in6_dev = __in6_dev_get(dev);
1512 if (!in6_dev)
1513 goto out;
1514
1515 iphdr = ipv6_hdr(skb);
1516 saddr = &iphdr->saddr;
1517 daddr = &iphdr->daddr;
1518
1519 msg = (struct nd_msg *)skb_transport_header(skb);
1520 if (msg->icmph.icmp6_code != 0 ||
1521 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1522 goto out;
1523
1524 if (ipv6_addr_loopback(daddr) ||
1525 ipv6_addr_is_multicast(&msg->target))
1526 goto out;
1527
1528 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1529
1530 if (n) {
1531 struct vxlan_fdb *f;
1532 struct sk_buff *reply;
1533
1534 if (!(n->nud_state & NUD_CONNECTED)) {
1535 neigh_release(n);
1536 goto out;
1537 }
1538
1539 f = vxlan_find_mac(vxlan, n->ha);
1540 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1541 /* bridge-local neighbor */
1542 neigh_release(n);
1543 goto out;
1544 }
1545
1546 reply = vxlan_na_create(skb, n,
1547 !!(f ? f->flags & NTF_ROUTER : 0));
1548
1549 neigh_release(n);
1550
1551 if (reply == NULL)
1552 goto out;
1553
1554 if (netif_rx_ni(reply) == NET_RX_DROP)
1555 dev->stats.rx_dropped++;
1556
1557 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1558 union vxlan_addr ipa = {
1559 .sin6.sin6_addr = msg->target,
1560 .sin6.sin6_family = AF_INET6,
1561 };
1562
1563 vxlan_ip_miss(dev, &ipa);
1564 }
1565
1566 out:
1567 consume_skb(skb);
1568 return NETDEV_TX_OK;
1569 }
1570 #endif
1571
1572 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1573 {
1574 struct vxlan_dev *vxlan = netdev_priv(dev);
1575 struct neighbour *n;
1576
1577 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1578 return false;
1579
1580 n = NULL;
1581 switch (ntohs(eth_hdr(skb)->h_proto)) {
1582 case ETH_P_IP:
1583 {
1584 struct iphdr *pip;
1585
1586 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1587 return false;
1588 pip = ip_hdr(skb);
1589 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1590 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1591 union vxlan_addr ipa = {
1592 .sin.sin_addr.s_addr = pip->daddr,
1593 .sin.sin_family = AF_INET,
1594 };
1595
1596 vxlan_ip_miss(dev, &ipa);
1597 return false;
1598 }
1599
1600 break;
1601 }
1602 #if IS_ENABLED(CONFIG_IPV6)
1603 case ETH_P_IPV6:
1604 {
1605 struct ipv6hdr *pip6;
1606
1607 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1608 return false;
1609 pip6 = ipv6_hdr(skb);
1610 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1611 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1612 union vxlan_addr ipa = {
1613 .sin6.sin6_addr = pip6->daddr,
1614 .sin6.sin6_family = AF_INET6,
1615 };
1616
1617 vxlan_ip_miss(dev, &ipa);
1618 return false;
1619 }
1620
1621 break;
1622 }
1623 #endif
1624 default:
1625 return false;
1626 }
1627
1628 if (n) {
1629 bool diff;
1630
1631 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1632 if (diff) {
1633 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1634 dev->addr_len);
1635 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1636 }
1637 neigh_release(n);
1638 return diff;
1639 }
1640
1641 return false;
1642 }
1643
1644 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1645 struct vxlan_metadata *md)
1646 {
1647 struct vxlanhdr_gbp *gbp;
1648
1649 if (!md->gbp)
1650 return;
1651
1652 gbp = (struct vxlanhdr_gbp *)vxh;
1653 vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1654
1655 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1656 gbp->dont_learn = 1;
1657
1658 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1659 gbp->policy_applied = 1;
1660
1661 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1662 }
1663
1664 #if IS_ENABLED(CONFIG_IPV6)
1665 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1666 struct sk_buff *skb,
1667 struct net_device *dev, struct in6_addr *saddr,
1668 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1669 __be16 src_port, __be16 dst_port, __be32 vni,
1670 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1671 {
1672 struct vxlanhdr *vxh;
1673 int min_headroom;
1674 int err;
1675 bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1676 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1677 u16 hdrlen = sizeof(struct vxlanhdr);
1678
1679 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1680 skb->ip_summed == CHECKSUM_PARTIAL) {
1681 int csum_start = skb_checksum_start_offset(skb);
1682
1683 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1684 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1685 (skb->csum_offset == offsetof(struct udphdr, check) ||
1686 skb->csum_offset == offsetof(struct tcphdr, check))) {
1687 udp_sum = false;
1688 type |= SKB_GSO_TUNNEL_REMCSUM;
1689 }
1690 }
1691
1692 skb_scrub_packet(skb, xnet);
1693
1694 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1695 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1696 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1697
1698 /* Need space for new headers (invalidates iph ptr) */
1699 err = skb_cow_head(skb, min_headroom);
1700 if (unlikely(err)) {
1701 kfree_skb(skb);
1702 goto err;
1703 }
1704
1705 skb = vlan_hwaccel_push_inside(skb);
1706 if (WARN_ON(!skb)) {
1707 err = -ENOMEM;
1708 goto err;
1709 }
1710
1711 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1712 if (IS_ERR(skb)) {
1713 err = -EINVAL;
1714 goto err;
1715 }
1716
1717 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1718 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1719 vxh->vx_vni = vni;
1720
1721 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1722 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1723 VXLAN_RCO_SHIFT;
1724
1725 if (skb->csum_offset == offsetof(struct udphdr, check))
1726 data |= VXLAN_RCO_UDP;
1727
1728 vxh->vx_vni |= htonl(data);
1729 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1730
1731 if (!skb_is_gso(skb)) {
1732 skb->ip_summed = CHECKSUM_NONE;
1733 skb->encapsulation = 0;
1734 }
1735 }
1736
1737 if (vxflags & VXLAN_F_GBP)
1738 vxlan_build_gbp_hdr(vxh, vxflags, md);
1739
1740 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1741
1742 udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1743 ttl, src_port, dst_port,
1744 !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1745 return 0;
1746 err:
1747 dst_release(dst);
1748 return err;
1749 }
1750 #endif
1751
1752 static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
1753 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1754 __be16 src_port, __be16 dst_port, __be32 vni,
1755 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1756 {
1757 struct vxlanhdr *vxh;
1758 int min_headroom;
1759 int err;
1760 bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1761 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1762 u16 hdrlen = sizeof(struct vxlanhdr);
1763
1764 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1765 skb->ip_summed == CHECKSUM_PARTIAL) {
1766 int csum_start = skb_checksum_start_offset(skb);
1767
1768 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1769 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1770 (skb->csum_offset == offsetof(struct udphdr, check) ||
1771 skb->csum_offset == offsetof(struct tcphdr, check))) {
1772 udp_sum = false;
1773 type |= SKB_GSO_TUNNEL_REMCSUM;
1774 }
1775 }
1776
1777 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1778 + VXLAN_HLEN + sizeof(struct iphdr)
1779 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1780
1781 /* Need space for new headers (invalidates iph ptr) */
1782 err = skb_cow_head(skb, min_headroom);
1783 if (unlikely(err)) {
1784 kfree_skb(skb);
1785 return err;
1786 }
1787
1788 skb = vlan_hwaccel_push_inside(skb);
1789 if (WARN_ON(!skb))
1790 return -ENOMEM;
1791
1792 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1793 if (IS_ERR(skb))
1794 return PTR_ERR(skb);
1795
1796 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1797 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1798 vxh->vx_vni = vni;
1799
1800 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1801 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1802 VXLAN_RCO_SHIFT;
1803
1804 if (skb->csum_offset == offsetof(struct udphdr, check))
1805 data |= VXLAN_RCO_UDP;
1806
1807 vxh->vx_vni |= htonl(data);
1808 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1809
1810 if (!skb_is_gso(skb)) {
1811 skb->ip_summed = CHECKSUM_NONE;
1812 skb->encapsulation = 0;
1813 }
1814 }
1815
1816 if (vxflags & VXLAN_F_GBP)
1817 vxlan_build_gbp_hdr(vxh, vxflags, md);
1818
1819 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1820
1821 return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
1822 ttl, df, src_port, dst_port, xnet,
1823 !(vxflags & VXLAN_F_UDP_CSUM));
1824 }
1825
1826 /* Bypass encapsulation if the destination is local */
1827 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1828 struct vxlan_dev *dst_vxlan)
1829 {
1830 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1831 union vxlan_addr loopback;
1832 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1833 struct net_device *dev = skb->dev;
1834 int len = skb->len;
1835
1836 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1837 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1838 skb->pkt_type = PACKET_HOST;
1839 skb->encapsulation = 0;
1840 skb->dev = dst_vxlan->dev;
1841 __skb_pull(skb, skb_network_offset(skb));
1842
1843 if (remote_ip->sa.sa_family == AF_INET) {
1844 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1845 loopback.sa.sa_family = AF_INET;
1846 #if IS_ENABLED(CONFIG_IPV6)
1847 } else {
1848 loopback.sin6.sin6_addr = in6addr_loopback;
1849 loopback.sa.sa_family = AF_INET6;
1850 #endif
1851 }
1852
1853 if (dst_vxlan->flags & VXLAN_F_LEARN)
1854 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1855
1856 u64_stats_update_begin(&tx_stats->syncp);
1857 tx_stats->tx_packets++;
1858 tx_stats->tx_bytes += len;
1859 u64_stats_update_end(&tx_stats->syncp);
1860
1861 if (netif_rx(skb) == NET_RX_SUCCESS) {
1862 u64_stats_update_begin(&rx_stats->syncp);
1863 rx_stats->rx_packets++;
1864 rx_stats->rx_bytes += len;
1865 u64_stats_update_end(&rx_stats->syncp);
1866 } else {
1867 dev->stats.rx_dropped++;
1868 }
1869 }
1870
1871 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1872 struct vxlan_rdst *rdst, bool did_rsc)
1873 {
1874 struct ip_tunnel_info *info;
1875 struct vxlan_dev *vxlan = netdev_priv(dev);
1876 struct sock *sk = vxlan->vn_sock->sock->sk;
1877 unsigned short family = vxlan_get_sk_family(vxlan->vn_sock);
1878 struct rtable *rt = NULL;
1879 const struct iphdr *old_iph;
1880 struct flowi4 fl4;
1881 union vxlan_addr *dst;
1882 union vxlan_addr remote_ip;
1883 struct vxlan_metadata _md;
1884 struct vxlan_metadata *md = &_md;
1885 __be16 src_port = 0, dst_port;
1886 u32 vni;
1887 __be16 df = 0;
1888 __u8 tos, ttl;
1889 int err;
1890 u32 flags = vxlan->flags;
1891
1892 info = skb_tunnel_info(skb);
1893
1894 if (rdst) {
1895 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1896 vni = rdst->remote_vni;
1897 dst = &rdst->remote_ip;
1898 } else {
1899 if (!info) {
1900 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1901 dev->name);
1902 goto drop;
1903 }
1904 if (family != ip_tunnel_info_af(info))
1905 goto drop;
1906
1907 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1908 vni = be64_to_cpu(info->key.tun_id);
1909 remote_ip.sa.sa_family = family;
1910 if (family == AF_INET)
1911 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1912 else
1913 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1914 dst = &remote_ip;
1915 }
1916
1917 if (vxlan_addr_any(dst)) {
1918 if (did_rsc) {
1919 /* short-circuited back to local bridge */
1920 vxlan_encap_bypass(skb, vxlan, vxlan);
1921 return;
1922 }
1923 goto drop;
1924 }
1925
1926 old_iph = ip_hdr(skb);
1927
1928 ttl = vxlan->cfg.ttl;
1929 if (!ttl && vxlan_addr_multicast(dst))
1930 ttl = 1;
1931
1932 tos = vxlan->cfg.tos;
1933 if (tos == 1)
1934 tos = ip_tunnel_get_dsfield(old_iph, skb);
1935
1936 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1937 vxlan->cfg.port_max, true);
1938
1939 if (info) {
1940 if (info->key.tun_flags & TUNNEL_CSUM)
1941 flags |= VXLAN_F_UDP_CSUM;
1942 else
1943 flags &= ~VXLAN_F_UDP_CSUM;
1944
1945 ttl = info->key.ttl;
1946 tos = info->key.tos;
1947
1948 if (info->options_len)
1949 md = ip_tunnel_info_opts(info);
1950 } else {
1951 md->gbp = skb->mark;
1952 }
1953
1954 if (dst->sa.sa_family == AF_INET) {
1955 if (info && (info->key.tun_flags & TUNNEL_DONT_FRAGMENT))
1956 df = htons(IP_DF);
1957
1958 memset(&fl4, 0, sizeof(fl4));
1959 fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
1960 fl4.flowi4_tos = RT_TOS(tos);
1961 fl4.flowi4_mark = skb->mark;
1962 fl4.flowi4_proto = IPPROTO_UDP;
1963 fl4.daddr = dst->sin.sin_addr.s_addr;
1964 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1965
1966 rt = ip_route_output_key(vxlan->net, &fl4);
1967 if (IS_ERR(rt)) {
1968 netdev_dbg(dev, "no route to %pI4\n",
1969 &dst->sin.sin_addr.s_addr);
1970 dev->stats.tx_carrier_errors++;
1971 goto tx_error;
1972 }
1973
1974 if (rt->dst.dev == dev) {
1975 netdev_dbg(dev, "circular route to %pI4\n",
1976 &dst->sin.sin_addr.s_addr);
1977 dev->stats.collisions++;
1978 goto rt_tx_error;
1979 }
1980
1981 /* Bypass encapsulation if the destination is local */
1982 if (rt->rt_flags & RTCF_LOCAL &&
1983 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1984 struct vxlan_dev *dst_vxlan;
1985
1986 ip_rt_put(rt);
1987 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1988 dst->sa.sa_family, dst_port,
1989 vxlan->flags);
1990 if (!dst_vxlan)
1991 goto tx_error;
1992 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1993 return;
1994 }
1995
1996 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1997 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1998 err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
1999 dst->sin.sin_addr.s_addr, tos, ttl, df,
2000 src_port, dst_port, htonl(vni << 8), md,
2001 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2002 flags);
2003 if (err < 0) {
2004 /* skb is already freed. */
2005 skb = NULL;
2006 goto rt_tx_error;
2007 }
2008
2009 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
2010 #if IS_ENABLED(CONFIG_IPV6)
2011 } else {
2012 struct dst_entry *ndst;
2013 struct flowi6 fl6;
2014 u32 rt6i_flags;
2015
2016 memset(&fl6, 0, sizeof(fl6));
2017 fl6.flowi6_oif = rdst ? rdst->remote_ifindex : 0;
2018 fl6.daddr = dst->sin6.sin6_addr;
2019 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
2020 fl6.flowi6_mark = skb->mark;
2021 fl6.flowi6_proto = IPPROTO_UDP;
2022
2023 if (ipv6_stub->ipv6_dst_lookup(vxlan->net, sk, &ndst, &fl6)) {
2024 netdev_dbg(dev, "no route to %pI6\n",
2025 &dst->sin6.sin6_addr);
2026 dev->stats.tx_carrier_errors++;
2027 goto tx_error;
2028 }
2029
2030 if (ndst->dev == dev) {
2031 netdev_dbg(dev, "circular route to %pI6\n",
2032 &dst->sin6.sin6_addr);
2033 dst_release(ndst);
2034 dev->stats.collisions++;
2035 goto tx_error;
2036 }
2037
2038 /* Bypass encapsulation if the destination is local */
2039 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2040 if (rt6i_flags & RTF_LOCAL &&
2041 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2042 struct vxlan_dev *dst_vxlan;
2043
2044 dst_release(ndst);
2045 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2046 dst->sa.sa_family, dst_port,
2047 vxlan->flags);
2048 if (!dst_vxlan)
2049 goto tx_error;
2050 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2051 return;
2052 }
2053
2054 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2055 err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
2056 0, ttl, src_port, dst_port, htonl(vni << 8), md,
2057 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2058 flags);
2059 #endif
2060 }
2061
2062 return;
2063
2064 drop:
2065 dev->stats.tx_dropped++;
2066 goto tx_free;
2067
2068 rt_tx_error:
2069 ip_rt_put(rt);
2070 tx_error:
2071 dev->stats.tx_errors++;
2072 tx_free:
2073 dev_kfree_skb(skb);
2074 }
2075
2076 /* Transmit local packets over Vxlan
2077 *
2078 * Outer IP header inherits ECN and DF from inner header.
2079 * Outer UDP destination is the VXLAN assigned port.
2080 * source port is based on hash of flow
2081 */
2082 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2083 {
2084 struct vxlan_dev *vxlan = netdev_priv(dev);
2085 const struct ip_tunnel_info *info;
2086 struct ethhdr *eth;
2087 bool did_rsc = false;
2088 struct vxlan_rdst *rdst, *fdst = NULL;
2089 struct vxlan_fdb *f;
2090
2091 info = skb_tunnel_info(skb);
2092
2093 skb_reset_mac_header(skb);
2094 eth = eth_hdr(skb);
2095
2096 if ((vxlan->flags & VXLAN_F_PROXY)) {
2097 if (ntohs(eth->h_proto) == ETH_P_ARP)
2098 return arp_reduce(dev, skb);
2099 #if IS_ENABLED(CONFIG_IPV6)
2100 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2101 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2102 + sizeof(struct nd_msg)) &&
2103 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2104 struct nd_msg *msg;
2105
2106 msg = (struct nd_msg *)skb_transport_header(skb);
2107 if (msg->icmph.icmp6_code == 0 &&
2108 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2109 return neigh_reduce(dev, skb);
2110 }
2111 eth = eth_hdr(skb);
2112 #endif
2113 }
2114
2115 if (vxlan->flags & VXLAN_F_COLLECT_METADATA &&
2116 info && info->mode & IP_TUNNEL_INFO_TX) {
2117 vxlan_xmit_one(skb, dev, NULL, false);
2118 return NETDEV_TX_OK;
2119 }
2120
2121 f = vxlan_find_mac(vxlan, eth->h_dest);
2122 did_rsc = false;
2123
2124 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2125 (ntohs(eth->h_proto) == ETH_P_IP ||
2126 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2127 did_rsc = route_shortcircuit(dev, skb);
2128 if (did_rsc)
2129 f = vxlan_find_mac(vxlan, eth->h_dest);
2130 }
2131
2132 if (f == NULL) {
2133 f = vxlan_find_mac(vxlan, all_zeros_mac);
2134 if (f == NULL) {
2135 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2136 !is_multicast_ether_addr(eth->h_dest))
2137 vxlan_fdb_miss(vxlan, eth->h_dest);
2138
2139 dev->stats.tx_dropped++;
2140 kfree_skb(skb);
2141 return NETDEV_TX_OK;
2142 }
2143 }
2144
2145 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2146 struct sk_buff *skb1;
2147
2148 if (!fdst) {
2149 fdst = rdst;
2150 continue;
2151 }
2152 skb1 = skb_clone(skb, GFP_ATOMIC);
2153 if (skb1)
2154 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2155 }
2156
2157 if (fdst)
2158 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2159 else
2160 kfree_skb(skb);
2161 return NETDEV_TX_OK;
2162 }
2163
2164 /* Walk the forwarding table and purge stale entries */
2165 static void vxlan_cleanup(unsigned long arg)
2166 {
2167 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2168 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2169 unsigned int h;
2170
2171 if (!netif_running(vxlan->dev))
2172 return;
2173
2174 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2175 struct hlist_node *p, *n;
2176
2177 spin_lock_bh(&vxlan->hash_lock);
2178 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2179 struct vxlan_fdb *f
2180 = container_of(p, struct vxlan_fdb, hlist);
2181 unsigned long timeout;
2182
2183 if (f->state & NUD_PERMANENT)
2184 continue;
2185
2186 timeout = f->used + vxlan->cfg.age_interval * HZ;
2187 if (time_before_eq(timeout, jiffies)) {
2188 netdev_dbg(vxlan->dev,
2189 "garbage collect %pM\n",
2190 f->eth_addr);
2191 f->state = NUD_STALE;
2192 vxlan_fdb_destroy(vxlan, f);
2193 } else if (time_before(timeout, next_timer))
2194 next_timer = timeout;
2195 }
2196 spin_unlock_bh(&vxlan->hash_lock);
2197 }
2198
2199 mod_timer(&vxlan->age_timer, next_timer);
2200 }
2201
2202 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2203 {
2204 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2205 __u32 vni = vxlan->default_dst.remote_vni;
2206
2207 vxlan->vn_sock = vs;
2208 spin_lock(&vn->sock_lock);
2209 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2210 spin_unlock(&vn->sock_lock);
2211 }
2212
2213 /* Setup stats when device is created */
2214 static int vxlan_init(struct net_device *dev)
2215 {
2216 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2217 if (!dev->tstats)
2218 return -ENOMEM;
2219
2220 return 0;
2221 }
2222
2223 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2224 {
2225 struct vxlan_fdb *f;
2226
2227 spin_lock_bh(&vxlan->hash_lock);
2228 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2229 if (f)
2230 vxlan_fdb_destroy(vxlan, f);
2231 spin_unlock_bh(&vxlan->hash_lock);
2232 }
2233
2234 static void vxlan_uninit(struct net_device *dev)
2235 {
2236 struct vxlan_dev *vxlan = netdev_priv(dev);
2237
2238 vxlan_fdb_delete_default(vxlan);
2239
2240 free_percpu(dev->tstats);
2241 }
2242
2243 /* Start ageing timer and join group when device is brought up */
2244 static int vxlan_open(struct net_device *dev)
2245 {
2246 struct vxlan_dev *vxlan = netdev_priv(dev);
2247 struct vxlan_sock *vs;
2248 int ret = 0;
2249
2250 vs = vxlan_sock_add(vxlan->net, vxlan->cfg.dst_port,
2251 vxlan->cfg.no_share, vxlan->flags);
2252 if (IS_ERR(vs))
2253 return PTR_ERR(vs);
2254
2255 vxlan_vs_add_dev(vs, vxlan);
2256
2257 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2258 ret = vxlan_igmp_join(vxlan);
2259 if (ret == -EADDRINUSE)
2260 ret = 0;
2261 if (ret) {
2262 vxlan_sock_release(vs);
2263 return ret;
2264 }
2265 }
2266
2267 if (vxlan->cfg.age_interval)
2268 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2269
2270 return ret;
2271 }
2272
2273 /* Purge the forwarding table */
2274 static void vxlan_flush(struct vxlan_dev *vxlan)
2275 {
2276 unsigned int h;
2277
2278 spin_lock_bh(&vxlan->hash_lock);
2279 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2280 struct hlist_node *p, *n;
2281 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2282 struct vxlan_fdb *f
2283 = container_of(p, struct vxlan_fdb, hlist);
2284 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2285 if (!is_zero_ether_addr(f->eth_addr))
2286 vxlan_fdb_destroy(vxlan, f);
2287 }
2288 }
2289 spin_unlock_bh(&vxlan->hash_lock);
2290 }
2291
2292 /* Cleanup timer and forwarding table on shutdown */
2293 static int vxlan_stop(struct net_device *dev)
2294 {
2295 struct vxlan_dev *vxlan = netdev_priv(dev);
2296 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2297 struct vxlan_sock *vs = vxlan->vn_sock;
2298 int ret = 0;
2299
2300 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2301 !vxlan_group_used(vn, vxlan))
2302 ret = vxlan_igmp_leave(vxlan);
2303
2304 del_timer_sync(&vxlan->age_timer);
2305
2306 vxlan_flush(vxlan);
2307 vxlan_sock_release(vs);
2308
2309 return ret;
2310 }
2311
2312 /* Stub, nothing needs to be done. */
2313 static void vxlan_set_multicast_list(struct net_device *dev)
2314 {
2315 }
2316
2317 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2318 {
2319 struct vxlan_dev *vxlan = netdev_priv(dev);
2320 struct vxlan_rdst *dst = &vxlan->default_dst;
2321 struct net_device *lowerdev;
2322 int max_mtu;
2323
2324 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2325 if (lowerdev == NULL)
2326 return eth_change_mtu(dev, new_mtu);
2327
2328 if (dst->remote_ip.sa.sa_family == AF_INET6)
2329 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2330 else
2331 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2332
2333 if (new_mtu < 68 || new_mtu > max_mtu)
2334 return -EINVAL;
2335
2336 dev->mtu = new_mtu;
2337 return 0;
2338 }
2339
2340 static const struct net_device_ops vxlan_netdev_ops = {
2341 .ndo_init = vxlan_init,
2342 .ndo_uninit = vxlan_uninit,
2343 .ndo_open = vxlan_open,
2344 .ndo_stop = vxlan_stop,
2345 .ndo_start_xmit = vxlan_xmit,
2346 .ndo_get_stats64 = ip_tunnel_get_stats64,
2347 .ndo_set_rx_mode = vxlan_set_multicast_list,
2348 .ndo_change_mtu = vxlan_change_mtu,
2349 .ndo_validate_addr = eth_validate_addr,
2350 .ndo_set_mac_address = eth_mac_addr,
2351 .ndo_fdb_add = vxlan_fdb_add,
2352 .ndo_fdb_del = vxlan_fdb_delete,
2353 .ndo_fdb_dump = vxlan_fdb_dump,
2354 };
2355
2356 /* Info for udev, that this is a virtual tunnel endpoint */
2357 static struct device_type vxlan_type = {
2358 .name = "vxlan",
2359 };
2360
2361 /* Calls the ndo_add_vxlan_port of the caller in order to
2362 * supply the listening VXLAN udp ports. Callers are expected
2363 * to implement the ndo_add_vxlan_port.
2364 */
2365 void vxlan_get_rx_port(struct net_device *dev)
2366 {
2367 struct vxlan_sock *vs;
2368 struct net *net = dev_net(dev);
2369 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2370 sa_family_t sa_family;
2371 __be16 port;
2372 unsigned int i;
2373
2374 spin_lock(&vn->sock_lock);
2375 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2376 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2377 port = inet_sk(vs->sock->sk)->inet_sport;
2378 sa_family = vxlan_get_sk_family(vs);
2379 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2380 port);
2381 }
2382 }
2383 spin_unlock(&vn->sock_lock);
2384 }
2385 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2386
2387 /* Initialize the device structure. */
2388 static void vxlan_setup(struct net_device *dev)
2389 {
2390 struct vxlan_dev *vxlan = netdev_priv(dev);
2391 unsigned int h;
2392
2393 eth_hw_addr_random(dev);
2394 ether_setup(dev);
2395
2396 dev->netdev_ops = &vxlan_netdev_ops;
2397 dev->destructor = free_netdev;
2398 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2399
2400 dev->features |= NETIF_F_LLTX;
2401 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2402 dev->features |= NETIF_F_RXCSUM;
2403 dev->features |= NETIF_F_GSO_SOFTWARE;
2404
2405 dev->vlan_features = dev->features;
2406 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2407 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2408 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2409 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2410 netif_keep_dst(dev);
2411 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2412
2413 INIT_LIST_HEAD(&vxlan->next);
2414 spin_lock_init(&vxlan->hash_lock);
2415
2416 init_timer_deferrable(&vxlan->age_timer);
2417 vxlan->age_timer.function = vxlan_cleanup;
2418 vxlan->age_timer.data = (unsigned long) vxlan;
2419
2420 vxlan->cfg.dst_port = htons(vxlan_port);
2421
2422 vxlan->dev = dev;
2423
2424 gro_cells_init(&vxlan->gro_cells, dev);
2425
2426 for (h = 0; h < FDB_HASH_SIZE; ++h)
2427 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2428 }
2429
2430 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2431 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2432 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2433 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2434 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2435 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2436 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2437 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2438 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2439 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2440 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2441 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2442 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2443 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2444 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2445 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2446 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2447 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2448 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2449 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2450 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2451 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2452 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2453 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2454 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2455 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2456 };
2457
2458 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2459 {
2460 if (tb[IFLA_ADDRESS]) {
2461 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2462 pr_debug("invalid link address (not ethernet)\n");
2463 return -EINVAL;
2464 }
2465
2466 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2467 pr_debug("invalid all zero ethernet address\n");
2468 return -EADDRNOTAVAIL;
2469 }
2470 }
2471
2472 if (!data)
2473 return -EINVAL;
2474
2475 if (data[IFLA_VXLAN_ID]) {
2476 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2477 if (id >= VXLAN_VID_MASK)
2478 return -ERANGE;
2479 }
2480
2481 if (data[IFLA_VXLAN_PORT_RANGE]) {
2482 const struct ifla_vxlan_port_range *p
2483 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2484
2485 if (ntohs(p->high) < ntohs(p->low)) {
2486 pr_debug("port range %u .. %u not valid\n",
2487 ntohs(p->low), ntohs(p->high));
2488 return -EINVAL;
2489 }
2490 }
2491
2492 return 0;
2493 }
2494
2495 static void vxlan_get_drvinfo(struct net_device *netdev,
2496 struct ethtool_drvinfo *drvinfo)
2497 {
2498 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2499 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2500 }
2501
2502 static const struct ethtool_ops vxlan_ethtool_ops = {
2503 .get_drvinfo = vxlan_get_drvinfo,
2504 .get_link = ethtool_op_get_link,
2505 };
2506
2507 static void vxlan_del_work(struct work_struct *work)
2508 {
2509 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2510 udp_tunnel_sock_release(vs->sock);
2511 kfree_rcu(vs, rcu);
2512 }
2513
2514 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2515 __be16 port, u32 flags)
2516 {
2517 struct socket *sock;
2518 struct udp_port_cfg udp_conf;
2519 int err;
2520
2521 memset(&udp_conf, 0, sizeof(udp_conf));
2522
2523 if (ipv6) {
2524 udp_conf.family = AF_INET6;
2525 udp_conf.use_udp6_rx_checksums =
2526 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2527 udp_conf.ipv6_v6only = 1;
2528 } else {
2529 udp_conf.family = AF_INET;
2530 }
2531
2532 udp_conf.local_udp_port = port;
2533
2534 /* Open UDP socket */
2535 err = udp_sock_create(net, &udp_conf, &sock);
2536 if (err < 0)
2537 return ERR_PTR(err);
2538
2539 return sock;
2540 }
2541
2542 /* Create new listen socket if needed */
2543 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2544 u32 flags)
2545 {
2546 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2547 struct vxlan_sock *vs;
2548 struct socket *sock;
2549 unsigned int h;
2550 bool ipv6 = !!(flags & VXLAN_F_IPV6);
2551 struct udp_tunnel_sock_cfg tunnel_cfg;
2552
2553 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2554 if (!vs)
2555 return ERR_PTR(-ENOMEM);
2556
2557 for (h = 0; h < VNI_HASH_SIZE; ++h)
2558 INIT_HLIST_HEAD(&vs->vni_list[h]);
2559
2560 INIT_WORK(&vs->del_work, vxlan_del_work);
2561
2562 sock = vxlan_create_sock(net, ipv6, port, flags);
2563 if (IS_ERR(sock)) {
2564 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2565 PTR_ERR(sock));
2566 kfree(vs);
2567 return ERR_CAST(sock);
2568 }
2569
2570 vs->sock = sock;
2571 atomic_set(&vs->refcnt, 1);
2572 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2573
2574 /* Initialize the vxlan udp offloads structure */
2575 vs->udp_offloads.port = port;
2576 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2577 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2578
2579 spin_lock(&vn->sock_lock);
2580 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2581 vxlan_notify_add_rx_port(vs);
2582 spin_unlock(&vn->sock_lock);
2583
2584 /* Mark socket as an encapsulation socket. */
2585 tunnel_cfg.sk_user_data = vs;
2586 tunnel_cfg.encap_type = 1;
2587 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2588 tunnel_cfg.encap_destroy = NULL;
2589
2590 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2591
2592 return vs;
2593 }
2594
2595 static struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2596 bool no_share, u32 flags)
2597 {
2598 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2599 struct vxlan_sock *vs;
2600 bool ipv6 = flags & VXLAN_F_IPV6;
2601
2602 if (!no_share) {
2603 spin_lock(&vn->sock_lock);
2604 vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port,
2605 flags);
2606 if (vs) {
2607 if (!atomic_add_unless(&vs->refcnt, 1, 0))
2608 vs = ERR_PTR(-EBUSY);
2609 spin_unlock(&vn->sock_lock);
2610 return vs;
2611 }
2612 spin_unlock(&vn->sock_lock);
2613 }
2614
2615 return vxlan_socket_create(net, port, flags);
2616 }
2617
2618 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2619 struct vxlan_config *conf)
2620 {
2621 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2622 struct vxlan_dev *vxlan = netdev_priv(dev);
2623 struct vxlan_rdst *dst = &vxlan->default_dst;
2624 int err;
2625 bool use_ipv6 = false;
2626 __be16 default_port = vxlan->cfg.dst_port;
2627
2628 vxlan->net = src_net;
2629
2630 dst->remote_vni = conf->vni;
2631
2632 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2633
2634 /* Unless IPv6 is explicitly requested, assume IPv4 */
2635 if (!dst->remote_ip.sa.sa_family)
2636 dst->remote_ip.sa.sa_family = AF_INET;
2637
2638 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2639 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2640 if (!IS_ENABLED(CONFIG_IPV6))
2641 return -EPFNOSUPPORT;
2642 use_ipv6 = true;
2643 }
2644
2645 if (conf->remote_ifindex) {
2646 struct net_device *lowerdev
2647 = __dev_get_by_index(src_net, conf->remote_ifindex);
2648
2649 dst->remote_ifindex = conf->remote_ifindex;
2650
2651 if (!lowerdev) {
2652 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2653 return -ENODEV;
2654 }
2655
2656 #if IS_ENABLED(CONFIG_IPV6)
2657 if (use_ipv6) {
2658 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2659 if (idev && idev->cnf.disable_ipv6) {
2660 pr_info("IPv6 is disabled via sysctl\n");
2661 return -EPERM;
2662 }
2663 vxlan->flags |= VXLAN_F_IPV6;
2664 }
2665 #endif
2666
2667 if (!conf->mtu)
2668 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2669
2670 dev->needed_headroom = lowerdev->hard_header_len +
2671 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2672 } else if (use_ipv6) {
2673 vxlan->flags |= VXLAN_F_IPV6;
2674 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2675 } else {
2676 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2677 }
2678
2679 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2680 if (!vxlan->cfg.dst_port)
2681 vxlan->cfg.dst_port = default_port;
2682 vxlan->flags |= conf->flags;
2683
2684 if (!vxlan->cfg.age_interval)
2685 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2686
2687 if (vxlan_find_vni(src_net, conf->vni, use_ipv6 ? AF_INET6 : AF_INET,
2688 vxlan->cfg.dst_port, vxlan->flags))
2689 return -EEXIST;
2690
2691 dev->ethtool_ops = &vxlan_ethtool_ops;
2692
2693 /* create an fdb entry for a valid default destination */
2694 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2695 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2696 &vxlan->default_dst.remote_ip,
2697 NUD_REACHABLE|NUD_PERMANENT,
2698 NLM_F_EXCL|NLM_F_CREATE,
2699 vxlan->cfg.dst_port,
2700 vxlan->default_dst.remote_vni,
2701 vxlan->default_dst.remote_ifindex,
2702 NTF_SELF);
2703 if (err)
2704 return err;
2705 }
2706
2707 err = register_netdevice(dev);
2708 if (err) {
2709 vxlan_fdb_delete_default(vxlan);
2710 return err;
2711 }
2712
2713 list_add(&vxlan->next, &vn->vxlan_list);
2714
2715 return 0;
2716 }
2717
2718 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2719 u8 name_assign_type, struct vxlan_config *conf)
2720 {
2721 struct nlattr *tb[IFLA_MAX+1];
2722 struct net_device *dev;
2723 int err;
2724
2725 memset(&tb, 0, sizeof(tb));
2726
2727 dev = rtnl_create_link(net, name, name_assign_type,
2728 &vxlan_link_ops, tb);
2729 if (IS_ERR(dev))
2730 return dev;
2731
2732 err = vxlan_dev_configure(net, dev, conf);
2733 if (err < 0) {
2734 free_netdev(dev);
2735 return ERR_PTR(err);
2736 }
2737
2738 return dev;
2739 }
2740 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2741
2742 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2743 struct nlattr *tb[], struct nlattr *data[])
2744 {
2745 struct vxlan_config conf;
2746 int err;
2747
2748 if (!data[IFLA_VXLAN_ID])
2749 return -EINVAL;
2750
2751 memset(&conf, 0, sizeof(conf));
2752 conf.vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2753
2754 if (data[IFLA_VXLAN_GROUP]) {
2755 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2756 } else if (data[IFLA_VXLAN_GROUP6]) {
2757 if (!IS_ENABLED(CONFIG_IPV6))
2758 return -EPFNOSUPPORT;
2759
2760 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2761 conf.remote_ip.sa.sa_family = AF_INET6;
2762 }
2763
2764 if (data[IFLA_VXLAN_LOCAL]) {
2765 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2766 conf.saddr.sa.sa_family = AF_INET;
2767 } else if (data[IFLA_VXLAN_LOCAL6]) {
2768 if (!IS_ENABLED(CONFIG_IPV6))
2769 return -EPFNOSUPPORT;
2770
2771 /* TODO: respect scope id */
2772 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2773 conf.saddr.sa.sa_family = AF_INET6;
2774 }
2775
2776 if (data[IFLA_VXLAN_LINK])
2777 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2778
2779 if (data[IFLA_VXLAN_TOS])
2780 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2781
2782 if (data[IFLA_VXLAN_TTL])
2783 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2784
2785 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2786 conf.flags |= VXLAN_F_LEARN;
2787
2788 if (data[IFLA_VXLAN_AGEING])
2789 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2790
2791 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2792 conf.flags |= VXLAN_F_PROXY;
2793
2794 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2795 conf.flags |= VXLAN_F_RSC;
2796
2797 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2798 conf.flags |= VXLAN_F_L2MISS;
2799
2800 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2801 conf.flags |= VXLAN_F_L3MISS;
2802
2803 if (data[IFLA_VXLAN_LIMIT])
2804 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2805
2806 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2807 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2808 conf.flags |= VXLAN_F_COLLECT_METADATA;
2809
2810 if (data[IFLA_VXLAN_PORT_RANGE]) {
2811 const struct ifla_vxlan_port_range *p
2812 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2813 conf.port_min = ntohs(p->low);
2814 conf.port_max = ntohs(p->high);
2815 }
2816
2817 if (data[IFLA_VXLAN_PORT])
2818 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2819
2820 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2821 conf.flags |= VXLAN_F_UDP_CSUM;
2822
2823 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2824 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2825 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2826
2827 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2828 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2829 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2830
2831 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2832 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2833 conf.flags |= VXLAN_F_REMCSUM_TX;
2834
2835 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2836 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2837 conf.flags |= VXLAN_F_REMCSUM_RX;
2838
2839 if (data[IFLA_VXLAN_GBP])
2840 conf.flags |= VXLAN_F_GBP;
2841
2842 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2843 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2844
2845 err = vxlan_dev_configure(src_net, dev, &conf);
2846 switch (err) {
2847 case -ENODEV:
2848 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2849 break;
2850
2851 case -EPERM:
2852 pr_info("IPv6 is disabled via sysctl\n");
2853 break;
2854
2855 case -EEXIST:
2856 pr_info("duplicate VNI %u\n", conf.vni);
2857 break;
2858 }
2859
2860 return err;
2861 }
2862
2863 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2864 {
2865 struct vxlan_dev *vxlan = netdev_priv(dev);
2866 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2867
2868 spin_lock(&vn->sock_lock);
2869 if (!hlist_unhashed(&vxlan->hlist))
2870 hlist_del_rcu(&vxlan->hlist);
2871 spin_unlock(&vn->sock_lock);
2872
2873 gro_cells_destroy(&vxlan->gro_cells);
2874 list_del(&vxlan->next);
2875 unregister_netdevice_queue(dev, head);
2876 }
2877
2878 static size_t vxlan_get_size(const struct net_device *dev)
2879 {
2880
2881 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2882 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2883 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2884 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2885 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2886 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2887 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2888 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2889 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2890 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2891 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2892 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
2893 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2894 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2895 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2896 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2897 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2898 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2899 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2900 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2901 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2902 0;
2903 }
2904
2905 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2906 {
2907 const struct vxlan_dev *vxlan = netdev_priv(dev);
2908 const struct vxlan_rdst *dst = &vxlan->default_dst;
2909 struct ifla_vxlan_port_range ports = {
2910 .low = htons(vxlan->cfg.port_min),
2911 .high = htons(vxlan->cfg.port_max),
2912 };
2913
2914 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2915 goto nla_put_failure;
2916
2917 if (!vxlan_addr_any(&dst->remote_ip)) {
2918 if (dst->remote_ip.sa.sa_family == AF_INET) {
2919 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
2920 dst->remote_ip.sin.sin_addr.s_addr))
2921 goto nla_put_failure;
2922 #if IS_ENABLED(CONFIG_IPV6)
2923 } else {
2924 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
2925 &dst->remote_ip.sin6.sin6_addr))
2926 goto nla_put_failure;
2927 #endif
2928 }
2929 }
2930
2931 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2932 goto nla_put_failure;
2933
2934 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
2935 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
2936 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
2937 vxlan->cfg.saddr.sin.sin_addr.s_addr))
2938 goto nla_put_failure;
2939 #if IS_ENABLED(CONFIG_IPV6)
2940 } else {
2941 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
2942 &vxlan->cfg.saddr.sin6.sin6_addr))
2943 goto nla_put_failure;
2944 #endif
2945 }
2946 }
2947
2948 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
2949 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
2950 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2951 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2952 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2953 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2954 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2955 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2956 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2957 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2958 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2959 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
2960 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
2961 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
2962 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
2963 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
2964 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2965 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2966 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2967 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2968 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2969 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
2970 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
2971 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
2972 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
2973 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
2974 goto nla_put_failure;
2975
2976 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2977 goto nla_put_failure;
2978
2979 if (vxlan->flags & VXLAN_F_GBP &&
2980 nla_put_flag(skb, IFLA_VXLAN_GBP))
2981 goto nla_put_failure;
2982
2983 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
2984 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
2985 goto nla_put_failure;
2986
2987 return 0;
2988
2989 nla_put_failure:
2990 return -EMSGSIZE;
2991 }
2992
2993 static struct net *vxlan_get_link_net(const struct net_device *dev)
2994 {
2995 struct vxlan_dev *vxlan = netdev_priv(dev);
2996
2997 return vxlan->net;
2998 }
2999
3000 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3001 .kind = "vxlan",
3002 .maxtype = IFLA_VXLAN_MAX,
3003 .policy = vxlan_policy,
3004 .priv_size = sizeof(struct vxlan_dev),
3005 .setup = vxlan_setup,
3006 .validate = vxlan_validate,
3007 .newlink = vxlan_newlink,
3008 .dellink = vxlan_dellink,
3009 .get_size = vxlan_get_size,
3010 .fill_info = vxlan_fill_info,
3011 .get_link_net = vxlan_get_link_net,
3012 };
3013
3014 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3015 struct net_device *dev)
3016 {
3017 struct vxlan_dev *vxlan, *next;
3018 LIST_HEAD(list_kill);
3019
3020 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3021 struct vxlan_rdst *dst = &vxlan->default_dst;
3022
3023 /* In case we created vxlan device with carrier
3024 * and we loose the carrier due to module unload
3025 * we also need to remove vxlan device. In other
3026 * cases, it's not necessary and remote_ifindex
3027 * is 0 here, so no matches.
3028 */
3029 if (dst->remote_ifindex == dev->ifindex)
3030 vxlan_dellink(vxlan->dev, &list_kill);
3031 }
3032
3033 unregister_netdevice_many(&list_kill);
3034 }
3035
3036 static int vxlan_lowerdev_event(struct notifier_block *unused,
3037 unsigned long event, void *ptr)
3038 {
3039 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3040 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3041
3042 if (event == NETDEV_UNREGISTER)
3043 vxlan_handle_lowerdev_unregister(vn, dev);
3044
3045 return NOTIFY_DONE;
3046 }
3047
3048 static struct notifier_block vxlan_notifier_block __read_mostly = {
3049 .notifier_call = vxlan_lowerdev_event,
3050 };
3051
3052 static __net_init int vxlan_init_net(struct net *net)
3053 {
3054 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3055 unsigned int h;
3056
3057 INIT_LIST_HEAD(&vn->vxlan_list);
3058 spin_lock_init(&vn->sock_lock);
3059
3060 for (h = 0; h < PORT_HASH_SIZE; ++h)
3061 INIT_HLIST_HEAD(&vn->sock_list[h]);
3062
3063 return 0;
3064 }
3065
3066 static void __net_exit vxlan_exit_net(struct net *net)
3067 {
3068 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3069 struct vxlan_dev *vxlan, *next;
3070 struct net_device *dev, *aux;
3071 LIST_HEAD(list);
3072
3073 rtnl_lock();
3074 for_each_netdev_safe(net, dev, aux)
3075 if (dev->rtnl_link_ops == &vxlan_link_ops)
3076 unregister_netdevice_queue(dev, &list);
3077
3078 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3079 /* If vxlan->dev is in the same netns, it has already been added
3080 * to the list by the previous loop.
3081 */
3082 if (!net_eq(dev_net(vxlan->dev), net)) {
3083 gro_cells_destroy(&vxlan->gro_cells);
3084 unregister_netdevice_queue(vxlan->dev, &list);
3085 }
3086 }
3087
3088 unregister_netdevice_many(&list);
3089 rtnl_unlock();
3090 }
3091
3092 static struct pernet_operations vxlan_net_ops = {
3093 .init = vxlan_init_net,
3094 .exit = vxlan_exit_net,
3095 .id = &vxlan_net_id,
3096 .size = sizeof(struct vxlan_net),
3097 };
3098
3099 static int __init vxlan_init_module(void)
3100 {
3101 int rc;
3102
3103 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3104 if (!vxlan_wq)
3105 return -ENOMEM;
3106
3107 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3108
3109 rc = register_pernet_subsys(&vxlan_net_ops);
3110 if (rc)
3111 goto out1;
3112
3113 rc = register_netdevice_notifier(&vxlan_notifier_block);
3114 if (rc)
3115 goto out2;
3116
3117 rc = rtnl_link_register(&vxlan_link_ops);
3118 if (rc)
3119 goto out3;
3120
3121 return 0;
3122 out3:
3123 unregister_netdevice_notifier(&vxlan_notifier_block);
3124 out2:
3125 unregister_pernet_subsys(&vxlan_net_ops);
3126 out1:
3127 destroy_workqueue(vxlan_wq);
3128 return rc;
3129 }
3130 late_initcall(vxlan_init_module);
3131
3132 static void __exit vxlan_cleanup_module(void)
3133 {
3134 rtnl_link_unregister(&vxlan_link_ops);
3135 unregister_netdevice_notifier(&vxlan_notifier_block);
3136 destroy_workqueue(vxlan_wq);
3137 unregister_pernet_subsys(&vxlan_net_ops);
3138 /* rcu_barrier() is called by netns */
3139 }
3140 module_exit(vxlan_cleanup_module);
3141
3142 MODULE_LICENSE("GPL");
3143 MODULE_VERSION(VXLAN_VERSION);
3144 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3145 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3146 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
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