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[mirror_ubuntu-hirsute-kernel.git] / drivers / net / vxlan.c
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/rculist.h>
20 #include <linux/netdevice.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/udp.h>
24 #include <linux/igmp.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/hash.h>
29 #include <linux/ethtool.h>
30 #include <net/arp.h>
31 #include <net/ndisc.h>
32 #include <net/ip.h>
33 #include <net/ip_tunnels.h>
34 #include <net/icmp.h>
35 #include <net/udp.h>
36 #include <net/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 int vxlan_sock_add(struct vxlan_dev *vxlan);
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 /* Forwarding table entry */
88 struct vxlan_fdb {
89 struct hlist_node hlist; /* linked list of entries */
90 struct rcu_head rcu;
91 unsigned long updated; /* jiffies */
92 unsigned long used;
93 struct list_head remotes;
94 u8 eth_addr[ETH_ALEN];
95 u16 state; /* see ndm_state */
96 u8 flags; /* see ndm_flags */
97 };
98
99 /* salt for hash table */
100 static u32 vxlan_salt __read_mostly;
101 static struct workqueue_struct *vxlan_wq;
102
103 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
104 {
105 return vs->flags & VXLAN_F_COLLECT_METADATA ||
106 ip_tunnel_collect_metadata();
107 }
108
109 #if IS_ENABLED(CONFIG_IPV6)
110 static inline
111 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
112 {
113 if (a->sa.sa_family != b->sa.sa_family)
114 return false;
115 if (a->sa.sa_family == AF_INET6)
116 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
117 else
118 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
119 }
120
121 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
122 {
123 if (ipa->sa.sa_family == AF_INET6)
124 return ipv6_addr_any(&ipa->sin6.sin6_addr);
125 else
126 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
127 }
128
129 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
130 {
131 if (ipa->sa.sa_family == AF_INET6)
132 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
133 else
134 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
135 }
136
137 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
138 {
139 if (nla_len(nla) >= sizeof(struct in6_addr)) {
140 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
141 ip->sa.sa_family = AF_INET6;
142 return 0;
143 } else if (nla_len(nla) >= sizeof(__be32)) {
144 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
145 ip->sa.sa_family = AF_INET;
146 return 0;
147 } else {
148 return -EAFNOSUPPORT;
149 }
150 }
151
152 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
153 const union vxlan_addr *ip)
154 {
155 if (ip->sa.sa_family == AF_INET6)
156 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
157 else
158 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
159 }
160
161 #else /* !CONFIG_IPV6 */
162
163 static inline
164 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
165 {
166 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
167 }
168
169 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
170 {
171 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
172 }
173
174 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
175 {
176 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
177 }
178
179 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
180 {
181 if (nla_len(nla) >= sizeof(struct in6_addr)) {
182 return -EAFNOSUPPORT;
183 } else if (nla_len(nla) >= sizeof(__be32)) {
184 ip->sin.sin_addr.s_addr = nla_get_in_addr(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 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
196 }
197 #endif
198
199 /* Virtual Network hash table head */
200 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
201 {
202 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
203 }
204
205 /* Socket hash table head */
206 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
207 {
208 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
209
210 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
211 }
212
213 /* First remote destination for a forwarding entry.
214 * Guaranteed to be non-NULL because remotes are never deleted.
215 */
216 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
217 {
218 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
219 }
220
221 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
222 {
223 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
224 }
225
226 /* Find VXLAN socket based on network namespace, address family and UDP port
227 * and enabled unshareable flags.
228 */
229 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
230 __be16 port, u32 flags)
231 {
232 struct vxlan_sock *vs;
233
234 flags &= VXLAN_F_RCV_FLAGS;
235
236 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
237 if (inet_sk(vs->sock->sk)->inet_sport == port &&
238 vxlan_get_sk_family(vs) == family &&
239 vs->flags == flags)
240 return vs;
241 }
242 return NULL;
243 }
244
245 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
246 {
247 struct vxlan_dev *vxlan;
248
249 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
250 if (vxlan->default_dst.remote_vni == id)
251 return vxlan;
252 }
253
254 return NULL;
255 }
256
257 /* Look up VNI in a per net namespace table */
258 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
259 sa_family_t family, __be16 port,
260 u32 flags)
261 {
262 struct vxlan_sock *vs;
263
264 vs = vxlan_find_sock(net, family, port, flags);
265 if (!vs)
266 return NULL;
267
268 return vxlan_vs_find_vni(vs, id);
269 }
270
271 /* Fill in neighbour message in skbuff. */
272 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
273 const struct vxlan_fdb *fdb,
274 u32 portid, u32 seq, int type, unsigned int flags,
275 const struct vxlan_rdst *rdst)
276 {
277 unsigned long now = jiffies;
278 struct nda_cacheinfo ci;
279 struct nlmsghdr *nlh;
280 struct ndmsg *ndm;
281 bool send_ip, send_eth;
282
283 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
284 if (nlh == NULL)
285 return -EMSGSIZE;
286
287 ndm = nlmsg_data(nlh);
288 memset(ndm, 0, sizeof(*ndm));
289
290 send_eth = send_ip = true;
291
292 if (type == RTM_GETNEIGH) {
293 ndm->ndm_family = AF_INET;
294 send_ip = !vxlan_addr_any(&rdst->remote_ip);
295 send_eth = !is_zero_ether_addr(fdb->eth_addr);
296 } else
297 ndm->ndm_family = AF_BRIDGE;
298 ndm->ndm_state = fdb->state;
299 ndm->ndm_ifindex = vxlan->dev->ifindex;
300 ndm->ndm_flags = fdb->flags;
301 ndm->ndm_type = RTN_UNICAST;
302
303 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
304 nla_put_s32(skb, NDA_LINK_NETNSID,
305 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
306 goto nla_put_failure;
307
308 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
309 goto nla_put_failure;
310
311 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
312 goto nla_put_failure;
313
314 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
315 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
316 goto nla_put_failure;
317 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
318 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
319 goto nla_put_failure;
320 if (rdst->remote_ifindex &&
321 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
322 goto nla_put_failure;
323
324 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
325 ci.ndm_confirmed = 0;
326 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
327 ci.ndm_refcnt = 0;
328
329 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
330 goto nla_put_failure;
331
332 nlmsg_end(skb, nlh);
333 return 0;
334
335 nla_put_failure:
336 nlmsg_cancel(skb, nlh);
337 return -EMSGSIZE;
338 }
339
340 static inline size_t vxlan_nlmsg_size(void)
341 {
342 return NLMSG_ALIGN(sizeof(struct ndmsg))
343 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
344 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
345 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
346 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
347 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
348 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
349 + nla_total_size(sizeof(struct nda_cacheinfo));
350 }
351
352 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
353 struct vxlan_rdst *rd, int type)
354 {
355 struct net *net = dev_net(vxlan->dev);
356 struct sk_buff *skb;
357 int err = -ENOBUFS;
358
359 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
360 if (skb == NULL)
361 goto errout;
362
363 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
364 if (err < 0) {
365 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
366 WARN_ON(err == -EMSGSIZE);
367 kfree_skb(skb);
368 goto errout;
369 }
370
371 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
372 return;
373 errout:
374 if (err < 0)
375 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
376 }
377
378 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
379 {
380 struct vxlan_dev *vxlan = netdev_priv(dev);
381 struct vxlan_fdb f = {
382 .state = NUD_STALE,
383 };
384 struct vxlan_rdst remote = {
385 .remote_ip = *ipa, /* goes to NDA_DST */
386 .remote_vni = VXLAN_N_VID,
387 };
388
389 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
390 }
391
392 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
393 {
394 struct vxlan_fdb f = {
395 .state = NUD_STALE,
396 };
397 struct vxlan_rdst remote = { };
398
399 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
400
401 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
402 }
403
404 /* Hash Ethernet address */
405 static u32 eth_hash(const unsigned char *addr)
406 {
407 u64 value = get_unaligned((u64 *)addr);
408
409 /* only want 6 bytes */
410 #ifdef __BIG_ENDIAN
411 value >>= 16;
412 #else
413 value <<= 16;
414 #endif
415 return hash_64(value, FDB_HASH_BITS);
416 }
417
418 /* Hash chain to use given mac address */
419 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
420 const u8 *mac)
421 {
422 return &vxlan->fdb_head[eth_hash(mac)];
423 }
424
425 /* Look up Ethernet address in forwarding table */
426 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
427 const u8 *mac)
428 {
429 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
430 struct vxlan_fdb *f;
431
432 hlist_for_each_entry_rcu(f, head, hlist) {
433 if (ether_addr_equal(mac, f->eth_addr))
434 return f;
435 }
436
437 return NULL;
438 }
439
440 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
441 const u8 *mac)
442 {
443 struct vxlan_fdb *f;
444
445 f = __vxlan_find_mac(vxlan, mac);
446 if (f)
447 f->used = jiffies;
448
449 return f;
450 }
451
452 /* caller should hold vxlan->hash_lock */
453 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
454 union vxlan_addr *ip, __be16 port,
455 __u32 vni, __u32 ifindex)
456 {
457 struct vxlan_rdst *rd;
458
459 list_for_each_entry(rd, &f->remotes, list) {
460 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
461 rd->remote_port == port &&
462 rd->remote_vni == vni &&
463 rd->remote_ifindex == ifindex)
464 return rd;
465 }
466
467 return NULL;
468 }
469
470 /* Replace destination of unicast mac */
471 static int vxlan_fdb_replace(struct vxlan_fdb *f,
472 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
473 {
474 struct vxlan_rdst *rd;
475
476 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
477 if (rd)
478 return 0;
479
480 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
481 if (!rd)
482 return 0;
483 rd->remote_ip = *ip;
484 rd->remote_port = port;
485 rd->remote_vni = vni;
486 rd->remote_ifindex = ifindex;
487 return 1;
488 }
489
490 /* Add/update destinations for multicast */
491 static int vxlan_fdb_append(struct vxlan_fdb *f,
492 union vxlan_addr *ip, __be16 port, __u32 vni,
493 __u32 ifindex, struct vxlan_rdst **rdp)
494 {
495 struct vxlan_rdst *rd;
496
497 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
498 if (rd)
499 return 0;
500
501 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
502 if (rd == NULL)
503 return -ENOBUFS;
504 rd->remote_ip = *ip;
505 rd->remote_port = port;
506 rd->remote_vni = vni;
507 rd->remote_ifindex = ifindex;
508
509 list_add_tail_rcu(&rd->list, &f->remotes);
510
511 *rdp = rd;
512 return 1;
513 }
514
515 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
516 unsigned int off,
517 struct vxlanhdr *vh, size_t hdrlen,
518 u32 data, struct gro_remcsum *grc,
519 bool nopartial)
520 {
521 size_t start, offset;
522
523 if (skb->remcsum_offload)
524 return vh;
525
526 if (!NAPI_GRO_CB(skb)->csum_valid)
527 return NULL;
528
529 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
530 offset = start + ((data & VXLAN_RCO_UDP) ?
531 offsetof(struct udphdr, check) :
532 offsetof(struct tcphdr, check));
533
534 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
535 start, offset, grc, nopartial);
536
537 skb->remcsum_offload = 1;
538
539 return vh;
540 }
541
542 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
543 struct sk_buff *skb,
544 struct udp_offload *uoff)
545 {
546 struct sk_buff *p, **pp = NULL;
547 struct vxlanhdr *vh, *vh2;
548 unsigned int hlen, off_vx;
549 int flush = 1;
550 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
551 udp_offloads);
552 u32 flags;
553 struct gro_remcsum grc;
554
555 skb_gro_remcsum_init(&grc);
556
557 off_vx = skb_gro_offset(skb);
558 hlen = off_vx + sizeof(*vh);
559 vh = skb_gro_header_fast(skb, off_vx);
560 if (skb_gro_header_hard(skb, hlen)) {
561 vh = skb_gro_header_slow(skb, hlen, off_vx);
562 if (unlikely(!vh))
563 goto out;
564 }
565
566 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
567
568 flags = ntohl(vh->vx_flags);
569
570 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
571 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
572 ntohl(vh->vx_vni), &grc,
573 !!(vs->flags &
574 VXLAN_F_REMCSUM_NOPARTIAL));
575
576 if (!vh)
577 goto out;
578 }
579
580 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
581
582 flush = 0;
583
584 for (p = *head; p; p = p->next) {
585 if (!NAPI_GRO_CB(p)->same_flow)
586 continue;
587
588 vh2 = (struct vxlanhdr *)(p->data + off_vx);
589 if (vh->vx_flags != vh2->vx_flags ||
590 vh->vx_vni != vh2->vx_vni) {
591 NAPI_GRO_CB(p)->same_flow = 0;
592 continue;
593 }
594 }
595
596 pp = eth_gro_receive(head, skb);
597
598 out:
599 skb_gro_remcsum_cleanup(skb, &grc);
600 NAPI_GRO_CB(skb)->flush |= flush;
601
602 return pp;
603 }
604
605 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
606 struct udp_offload *uoff)
607 {
608 udp_tunnel_gro_complete(skb, nhoff);
609
610 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
611 }
612
613 /* Notify netdevs that UDP port started listening */
614 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
615 {
616 struct net_device *dev;
617 struct sock *sk = vs->sock->sk;
618 struct net *net = sock_net(sk);
619 sa_family_t sa_family = vxlan_get_sk_family(vs);
620 __be16 port = inet_sk(sk)->inet_sport;
621 int err;
622
623 if (sa_family == AF_INET) {
624 err = udp_add_offload(&vs->udp_offloads);
625 if (err)
626 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
627 }
628
629 rcu_read_lock();
630 for_each_netdev_rcu(net, dev) {
631 if (dev->netdev_ops->ndo_add_vxlan_port)
632 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
633 port);
634 }
635 rcu_read_unlock();
636 }
637
638 /* Notify netdevs that UDP port is no more listening */
639 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
640 {
641 struct net_device *dev;
642 struct sock *sk = vs->sock->sk;
643 struct net *net = sock_net(sk);
644 sa_family_t sa_family = vxlan_get_sk_family(vs);
645 __be16 port = inet_sk(sk)->inet_sport;
646
647 rcu_read_lock();
648 for_each_netdev_rcu(net, dev) {
649 if (dev->netdev_ops->ndo_del_vxlan_port)
650 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
651 port);
652 }
653 rcu_read_unlock();
654
655 if (sa_family == AF_INET)
656 udp_del_offload(&vs->udp_offloads);
657 }
658
659 /* Add new entry to forwarding table -- assumes lock held */
660 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
661 const u8 *mac, union vxlan_addr *ip,
662 __u16 state, __u16 flags,
663 __be16 port, __u32 vni, __u32 ifindex,
664 __u8 ndm_flags)
665 {
666 struct vxlan_rdst *rd = NULL;
667 struct vxlan_fdb *f;
668 int notify = 0;
669
670 f = __vxlan_find_mac(vxlan, mac);
671 if (f) {
672 if (flags & NLM_F_EXCL) {
673 netdev_dbg(vxlan->dev,
674 "lost race to create %pM\n", mac);
675 return -EEXIST;
676 }
677 if (f->state != state) {
678 f->state = state;
679 f->updated = jiffies;
680 notify = 1;
681 }
682 if (f->flags != ndm_flags) {
683 f->flags = ndm_flags;
684 f->updated = jiffies;
685 notify = 1;
686 }
687 if ((flags & NLM_F_REPLACE)) {
688 /* Only change unicasts */
689 if (!(is_multicast_ether_addr(f->eth_addr) ||
690 is_zero_ether_addr(f->eth_addr))) {
691 notify |= vxlan_fdb_replace(f, ip, port, vni,
692 ifindex);
693 } else
694 return -EOPNOTSUPP;
695 }
696 if ((flags & NLM_F_APPEND) &&
697 (is_multicast_ether_addr(f->eth_addr) ||
698 is_zero_ether_addr(f->eth_addr))) {
699 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
700 &rd);
701
702 if (rc < 0)
703 return rc;
704 notify |= rc;
705 }
706 } else {
707 if (!(flags & NLM_F_CREATE))
708 return -ENOENT;
709
710 if (vxlan->cfg.addrmax &&
711 vxlan->addrcnt >= vxlan->cfg.addrmax)
712 return -ENOSPC;
713
714 /* Disallow replace to add a multicast entry */
715 if ((flags & NLM_F_REPLACE) &&
716 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
717 return -EOPNOTSUPP;
718
719 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
720 f = kmalloc(sizeof(*f), GFP_ATOMIC);
721 if (!f)
722 return -ENOMEM;
723
724 notify = 1;
725 f->state = state;
726 f->flags = ndm_flags;
727 f->updated = f->used = jiffies;
728 INIT_LIST_HEAD(&f->remotes);
729 memcpy(f->eth_addr, mac, ETH_ALEN);
730
731 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
732
733 ++vxlan->addrcnt;
734 hlist_add_head_rcu(&f->hlist,
735 vxlan_fdb_head(vxlan, mac));
736 }
737
738 if (notify) {
739 if (rd == NULL)
740 rd = first_remote_rtnl(f);
741 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
742 }
743
744 return 0;
745 }
746
747 static void vxlan_fdb_free(struct rcu_head *head)
748 {
749 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
750 struct vxlan_rdst *rd, *nd;
751
752 list_for_each_entry_safe(rd, nd, &f->remotes, list)
753 kfree(rd);
754 kfree(f);
755 }
756
757 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
758 {
759 netdev_dbg(vxlan->dev,
760 "delete %pM\n", f->eth_addr);
761
762 --vxlan->addrcnt;
763 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
764
765 hlist_del_rcu(&f->hlist);
766 call_rcu(&f->rcu, vxlan_fdb_free);
767 }
768
769 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
770 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
771 {
772 struct net *net = dev_net(vxlan->dev);
773 int err;
774
775 if (tb[NDA_DST]) {
776 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
777 if (err)
778 return err;
779 } else {
780 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
781 if (remote->sa.sa_family == AF_INET) {
782 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
783 ip->sa.sa_family = AF_INET;
784 #if IS_ENABLED(CONFIG_IPV6)
785 } else {
786 ip->sin6.sin6_addr = in6addr_any;
787 ip->sa.sa_family = AF_INET6;
788 #endif
789 }
790 }
791
792 if (tb[NDA_PORT]) {
793 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
794 return -EINVAL;
795 *port = nla_get_be16(tb[NDA_PORT]);
796 } else {
797 *port = vxlan->cfg.dst_port;
798 }
799
800 if (tb[NDA_VNI]) {
801 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
802 return -EINVAL;
803 *vni = nla_get_u32(tb[NDA_VNI]);
804 } else {
805 *vni = vxlan->default_dst.remote_vni;
806 }
807
808 if (tb[NDA_IFINDEX]) {
809 struct net_device *tdev;
810
811 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
812 return -EINVAL;
813 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
814 tdev = __dev_get_by_index(net, *ifindex);
815 if (!tdev)
816 return -EADDRNOTAVAIL;
817 } else {
818 *ifindex = 0;
819 }
820
821 return 0;
822 }
823
824 /* Add static entry (via netlink) */
825 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
826 struct net_device *dev,
827 const unsigned char *addr, u16 vid, u16 flags)
828 {
829 struct vxlan_dev *vxlan = netdev_priv(dev);
830 /* struct net *net = dev_net(vxlan->dev); */
831 union vxlan_addr ip;
832 __be16 port;
833 u32 vni, ifindex;
834 int err;
835
836 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
837 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
838 ndm->ndm_state);
839 return -EINVAL;
840 }
841
842 if (tb[NDA_DST] == NULL)
843 return -EINVAL;
844
845 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
846 if (err)
847 return err;
848
849 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
850 return -EAFNOSUPPORT;
851
852 spin_lock_bh(&vxlan->hash_lock);
853 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
854 port, vni, ifindex, ndm->ndm_flags);
855 spin_unlock_bh(&vxlan->hash_lock);
856
857 return err;
858 }
859
860 /* Delete entry (via netlink) */
861 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
862 struct net_device *dev,
863 const unsigned char *addr, u16 vid)
864 {
865 struct vxlan_dev *vxlan = netdev_priv(dev);
866 struct vxlan_fdb *f;
867 struct vxlan_rdst *rd = NULL;
868 union vxlan_addr ip;
869 __be16 port;
870 u32 vni, ifindex;
871 int err;
872
873 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
874 if (err)
875 return err;
876
877 err = -ENOENT;
878
879 spin_lock_bh(&vxlan->hash_lock);
880 f = vxlan_find_mac(vxlan, addr);
881 if (!f)
882 goto out;
883
884 if (!vxlan_addr_any(&ip)) {
885 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
886 if (!rd)
887 goto out;
888 }
889
890 err = 0;
891
892 /* remove a destination if it's not the only one on the list,
893 * otherwise destroy the fdb entry
894 */
895 if (rd && !list_is_singular(&f->remotes)) {
896 list_del_rcu(&rd->list);
897 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
898 kfree_rcu(rd, rcu);
899 goto out;
900 }
901
902 vxlan_fdb_destroy(vxlan, f);
903
904 out:
905 spin_unlock_bh(&vxlan->hash_lock);
906
907 return err;
908 }
909
910 /* Dump forwarding table */
911 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
912 struct net_device *dev,
913 struct net_device *filter_dev, int idx)
914 {
915 struct vxlan_dev *vxlan = netdev_priv(dev);
916 unsigned int h;
917
918 for (h = 0; h < FDB_HASH_SIZE; ++h) {
919 struct vxlan_fdb *f;
920 int err;
921
922 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
923 struct vxlan_rdst *rd;
924
925 list_for_each_entry_rcu(rd, &f->remotes, list) {
926 if (idx < cb->args[0])
927 goto skip;
928
929 err = vxlan_fdb_info(skb, vxlan, f,
930 NETLINK_CB(cb->skb).portid,
931 cb->nlh->nlmsg_seq,
932 RTM_NEWNEIGH,
933 NLM_F_MULTI, rd);
934 if (err < 0)
935 goto out;
936 skip:
937 ++idx;
938 }
939 }
940 }
941 out:
942 return idx;
943 }
944
945 /* Watch incoming packets to learn mapping between Ethernet address
946 * and Tunnel endpoint.
947 * Return true if packet is bogus and should be dropped.
948 */
949 static bool vxlan_snoop(struct net_device *dev,
950 union vxlan_addr *src_ip, const u8 *src_mac)
951 {
952 struct vxlan_dev *vxlan = netdev_priv(dev);
953 struct vxlan_fdb *f;
954
955 f = vxlan_find_mac(vxlan, src_mac);
956 if (likely(f)) {
957 struct vxlan_rdst *rdst = first_remote_rcu(f);
958
959 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
960 return false;
961
962 /* Don't migrate static entries, drop packets */
963 if (f->state & NUD_NOARP)
964 return true;
965
966 if (net_ratelimit())
967 netdev_info(dev,
968 "%pM migrated from %pIS to %pIS\n",
969 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
970
971 rdst->remote_ip = *src_ip;
972 f->updated = jiffies;
973 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
974 } else {
975 /* learned new entry */
976 spin_lock(&vxlan->hash_lock);
977
978 /* close off race between vxlan_flush and incoming packets */
979 if (netif_running(dev))
980 vxlan_fdb_create(vxlan, src_mac, src_ip,
981 NUD_REACHABLE,
982 NLM_F_EXCL|NLM_F_CREATE,
983 vxlan->cfg.dst_port,
984 vxlan->default_dst.remote_vni,
985 0, NTF_SELF);
986 spin_unlock(&vxlan->hash_lock);
987 }
988
989 return false;
990 }
991
992 /* See if multicast group is already in use by other ID */
993 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
994 {
995 struct vxlan_dev *vxlan;
996 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
997
998 /* The vxlan_sock is only used by dev, leaving group has
999 * no effect on other vxlan devices.
1000 */
1001 if (family == AF_INET && dev->vn4_sock &&
1002 atomic_read(&dev->vn4_sock->refcnt) == 1)
1003 return false;
1004 #if IS_ENABLED(CONFIG_IPV6)
1005 if (family == AF_INET6 && dev->vn6_sock &&
1006 atomic_read(&dev->vn6_sock->refcnt) == 1)
1007 return false;
1008 #endif
1009
1010 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1011 if (!netif_running(vxlan->dev) || vxlan == dev)
1012 continue;
1013
1014 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1015 continue;
1016 #if IS_ENABLED(CONFIG_IPV6)
1017 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1018 continue;
1019 #endif
1020
1021 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1022 &dev->default_dst.remote_ip))
1023 continue;
1024
1025 if (vxlan->default_dst.remote_ifindex !=
1026 dev->default_dst.remote_ifindex)
1027 continue;
1028
1029 return true;
1030 }
1031
1032 return false;
1033 }
1034
1035 static void __vxlan_sock_release(struct vxlan_sock *vs)
1036 {
1037 struct vxlan_net *vn;
1038
1039 if (!vs)
1040 return;
1041 if (!atomic_dec_and_test(&vs->refcnt))
1042 return;
1043
1044 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1045 spin_lock(&vn->sock_lock);
1046 hlist_del_rcu(&vs->hlist);
1047 vxlan_notify_del_rx_port(vs);
1048 spin_unlock(&vn->sock_lock);
1049
1050 queue_work(vxlan_wq, &vs->del_work);
1051 }
1052
1053 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1054 {
1055 __vxlan_sock_release(vxlan->vn4_sock);
1056 #if IS_ENABLED(CONFIG_IPV6)
1057 __vxlan_sock_release(vxlan->vn6_sock);
1058 #endif
1059 }
1060
1061 /* Update multicast group membership when first VNI on
1062 * multicast address is brought up
1063 */
1064 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1065 {
1066 struct sock *sk;
1067 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1068 int ifindex = vxlan->default_dst.remote_ifindex;
1069 int ret = -EINVAL;
1070
1071 if (ip->sa.sa_family == AF_INET) {
1072 struct ip_mreqn mreq = {
1073 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1074 .imr_ifindex = ifindex,
1075 };
1076
1077 sk = vxlan->vn4_sock->sock->sk;
1078 lock_sock(sk);
1079 ret = ip_mc_join_group(sk, &mreq);
1080 release_sock(sk);
1081 #if IS_ENABLED(CONFIG_IPV6)
1082 } else {
1083 sk = vxlan->vn6_sock->sock->sk;
1084 lock_sock(sk);
1085 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1086 &ip->sin6.sin6_addr);
1087 release_sock(sk);
1088 #endif
1089 }
1090
1091 return ret;
1092 }
1093
1094 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1095 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1096 {
1097 struct sock *sk;
1098 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1099 int ifindex = vxlan->default_dst.remote_ifindex;
1100 int ret = -EINVAL;
1101
1102 if (ip->sa.sa_family == AF_INET) {
1103 struct ip_mreqn mreq = {
1104 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1105 .imr_ifindex = ifindex,
1106 };
1107
1108 sk = vxlan->vn4_sock->sock->sk;
1109 lock_sock(sk);
1110 ret = ip_mc_leave_group(sk, &mreq);
1111 release_sock(sk);
1112 #if IS_ENABLED(CONFIG_IPV6)
1113 } else {
1114 sk = vxlan->vn6_sock->sock->sk;
1115 lock_sock(sk);
1116 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1117 &ip->sin6.sin6_addr);
1118 release_sock(sk);
1119 #endif
1120 }
1121
1122 return ret;
1123 }
1124
1125 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1126 size_t hdrlen, u32 data, bool nopartial)
1127 {
1128 size_t start, offset, plen;
1129
1130 if (skb->remcsum_offload)
1131 return vh;
1132
1133 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1134 offset = start + ((data & VXLAN_RCO_UDP) ?
1135 offsetof(struct udphdr, check) :
1136 offsetof(struct tcphdr, check));
1137
1138 plen = hdrlen + offset + sizeof(u16);
1139
1140 if (!pskb_may_pull(skb, plen))
1141 return NULL;
1142
1143 vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1144
1145 skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1146 nopartial);
1147
1148 return vh;
1149 }
1150
1151 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1152 struct vxlan_metadata *md, u32 vni,
1153 struct metadata_dst *tun_dst)
1154 {
1155 struct iphdr *oip = NULL;
1156 struct ipv6hdr *oip6 = NULL;
1157 struct vxlan_dev *vxlan;
1158 struct pcpu_sw_netstats *stats;
1159 union vxlan_addr saddr;
1160 int err = 0;
1161 union vxlan_addr *remote_ip;
1162
1163 /* For flow based devices, map all packets to VNI 0 */
1164 if (vs->flags & VXLAN_F_COLLECT_METADATA)
1165 vni = 0;
1166
1167 /* Is this VNI defined? */
1168 vxlan = vxlan_vs_find_vni(vs, vni);
1169 if (!vxlan)
1170 goto drop;
1171
1172 remote_ip = &vxlan->default_dst.remote_ip;
1173 skb_reset_mac_header(skb);
1174 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1175 skb->protocol = eth_type_trans(skb, vxlan->dev);
1176 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1177
1178 /* Ignore packet loops (and multicast echo) */
1179 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1180 goto drop;
1181
1182 /* Re-examine inner Ethernet packet */
1183 if (remote_ip->sa.sa_family == AF_INET) {
1184 oip = ip_hdr(skb);
1185 saddr.sin.sin_addr.s_addr = oip->saddr;
1186 saddr.sa.sa_family = AF_INET;
1187 #if IS_ENABLED(CONFIG_IPV6)
1188 } else {
1189 oip6 = ipv6_hdr(skb);
1190 saddr.sin6.sin6_addr = oip6->saddr;
1191 saddr.sa.sa_family = AF_INET6;
1192 #endif
1193 }
1194
1195 if (tun_dst) {
1196 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1197 tun_dst = NULL;
1198 }
1199
1200 if ((vxlan->flags & VXLAN_F_LEARN) &&
1201 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1202 goto drop;
1203
1204 skb_reset_network_header(skb);
1205 /* In flow-based mode, GBP is carried in dst_metadata */
1206 if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1207 skb->mark = md->gbp;
1208
1209 if (oip6)
1210 err = IP6_ECN_decapsulate(oip6, skb);
1211 if (oip)
1212 err = IP_ECN_decapsulate(oip, skb);
1213
1214 if (unlikely(err)) {
1215 if (log_ecn_error) {
1216 if (oip6)
1217 net_info_ratelimited("non-ECT from %pI6\n",
1218 &oip6->saddr);
1219 if (oip)
1220 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1221 &oip->saddr, oip->tos);
1222 }
1223 if (err > 1) {
1224 ++vxlan->dev->stats.rx_frame_errors;
1225 ++vxlan->dev->stats.rx_errors;
1226 goto drop;
1227 }
1228 }
1229
1230 stats = this_cpu_ptr(vxlan->dev->tstats);
1231 u64_stats_update_begin(&stats->syncp);
1232 stats->rx_packets++;
1233 stats->rx_bytes += skb->len;
1234 u64_stats_update_end(&stats->syncp);
1235
1236 gro_cells_receive(&vxlan->gro_cells, skb);
1237
1238 return;
1239 drop:
1240 if (tun_dst)
1241 dst_release((struct dst_entry *)tun_dst);
1242
1243 /* Consume bad packet */
1244 kfree_skb(skb);
1245 }
1246
1247 /* Callback from net/ipv4/udp.c to receive packets */
1248 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1249 {
1250 struct metadata_dst *tun_dst = NULL;
1251 struct vxlan_sock *vs;
1252 struct vxlanhdr *vxh;
1253 u32 flags, vni;
1254 struct vxlan_metadata _md;
1255 struct vxlan_metadata *md = &_md;
1256
1257 /* Need Vxlan and inner Ethernet header to be present */
1258 if (!pskb_may_pull(skb, VXLAN_HLEN))
1259 goto error;
1260
1261 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1262 flags = ntohl(vxh->vx_flags);
1263 vni = ntohl(vxh->vx_vni);
1264
1265 if (flags & VXLAN_HF_VNI) {
1266 flags &= ~VXLAN_HF_VNI;
1267 } else {
1268 /* VNI flag always required to be set */
1269 goto bad_flags;
1270 }
1271
1272 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1273 goto drop;
1274 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1275
1276 vs = rcu_dereference_sk_user_data(sk);
1277 if (!vs)
1278 goto drop;
1279
1280 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1281 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1282 !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1283 if (!vxh)
1284 goto drop;
1285
1286 flags &= ~VXLAN_HF_RCO;
1287 vni &= VXLAN_VNI_MASK;
1288 }
1289
1290 if (vxlan_collect_metadata(vs)) {
1291 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1292 cpu_to_be64(vni >> 8), sizeof(*md));
1293
1294 if (!tun_dst)
1295 goto drop;
1296
1297 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1298 } else {
1299 memset(md, 0, sizeof(*md));
1300 }
1301
1302 /* For backwards compatibility, only allow reserved fields to be
1303 * used by VXLAN extensions if explicitly requested.
1304 */
1305 if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1306 struct vxlanhdr_gbp *gbp;
1307
1308 gbp = (struct vxlanhdr_gbp *)vxh;
1309 md->gbp = ntohs(gbp->policy_id);
1310
1311 if (tun_dst)
1312 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1313
1314 if (gbp->dont_learn)
1315 md->gbp |= VXLAN_GBP_DONT_LEARN;
1316
1317 if (gbp->policy_applied)
1318 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1319
1320 flags &= ~VXLAN_GBP_USED_BITS;
1321 }
1322
1323 if (flags || vni & ~VXLAN_VNI_MASK) {
1324 /* If there are any unprocessed flags remaining treat
1325 * this as a malformed packet. This behavior diverges from
1326 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1327 * in reserved fields are to be ignored. The approach here
1328 * maintains compatibility with previous stack code, and also
1329 * is more robust and provides a little more security in
1330 * adding extensions to VXLAN.
1331 */
1332
1333 goto bad_flags;
1334 }
1335
1336 vxlan_rcv(vs, skb, md, vni >> 8, tun_dst);
1337 return 0;
1338
1339 drop:
1340 /* Consume bad packet */
1341 kfree_skb(skb);
1342 return 0;
1343
1344 bad_flags:
1345 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1346 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1347
1348 error:
1349 if (tun_dst)
1350 dst_release((struct dst_entry *)tun_dst);
1351
1352 /* Return non vxlan pkt */
1353 return 1;
1354 }
1355
1356 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1357 {
1358 struct vxlan_dev *vxlan = netdev_priv(dev);
1359 struct arphdr *parp;
1360 u8 *arpptr, *sha;
1361 __be32 sip, tip;
1362 struct neighbour *n;
1363
1364 if (dev->flags & IFF_NOARP)
1365 goto out;
1366
1367 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1368 dev->stats.tx_dropped++;
1369 goto out;
1370 }
1371 parp = arp_hdr(skb);
1372
1373 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1374 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1375 parp->ar_pro != htons(ETH_P_IP) ||
1376 parp->ar_op != htons(ARPOP_REQUEST) ||
1377 parp->ar_hln != dev->addr_len ||
1378 parp->ar_pln != 4)
1379 goto out;
1380 arpptr = (u8 *)parp + sizeof(struct arphdr);
1381 sha = arpptr;
1382 arpptr += dev->addr_len; /* sha */
1383 memcpy(&sip, arpptr, sizeof(sip));
1384 arpptr += sizeof(sip);
1385 arpptr += dev->addr_len; /* tha */
1386 memcpy(&tip, arpptr, sizeof(tip));
1387
1388 if (ipv4_is_loopback(tip) ||
1389 ipv4_is_multicast(tip))
1390 goto out;
1391
1392 n = neigh_lookup(&arp_tbl, &tip, dev);
1393
1394 if (n) {
1395 struct vxlan_fdb *f;
1396 struct sk_buff *reply;
1397
1398 if (!(n->nud_state & NUD_CONNECTED)) {
1399 neigh_release(n);
1400 goto out;
1401 }
1402
1403 f = vxlan_find_mac(vxlan, n->ha);
1404 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1405 /* bridge-local neighbor */
1406 neigh_release(n);
1407 goto out;
1408 }
1409
1410 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1411 n->ha, sha);
1412
1413 neigh_release(n);
1414
1415 if (reply == NULL)
1416 goto out;
1417
1418 skb_reset_mac_header(reply);
1419 __skb_pull(reply, skb_network_offset(reply));
1420 reply->ip_summed = CHECKSUM_UNNECESSARY;
1421 reply->pkt_type = PACKET_HOST;
1422
1423 if (netif_rx_ni(reply) == NET_RX_DROP)
1424 dev->stats.rx_dropped++;
1425 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1426 union vxlan_addr ipa = {
1427 .sin.sin_addr.s_addr = tip,
1428 .sin.sin_family = AF_INET,
1429 };
1430
1431 vxlan_ip_miss(dev, &ipa);
1432 }
1433 out:
1434 consume_skb(skb);
1435 return NETDEV_TX_OK;
1436 }
1437
1438 #if IS_ENABLED(CONFIG_IPV6)
1439 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1440 struct neighbour *n, bool isrouter)
1441 {
1442 struct net_device *dev = request->dev;
1443 struct sk_buff *reply;
1444 struct nd_msg *ns, *na;
1445 struct ipv6hdr *pip6;
1446 u8 *daddr;
1447 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1448 int ns_olen;
1449 int i, len;
1450
1451 if (dev == NULL)
1452 return NULL;
1453
1454 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1455 sizeof(*na) + na_olen + dev->needed_tailroom;
1456 reply = alloc_skb(len, GFP_ATOMIC);
1457 if (reply == NULL)
1458 return NULL;
1459
1460 reply->protocol = htons(ETH_P_IPV6);
1461 reply->dev = dev;
1462 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1463 skb_push(reply, sizeof(struct ethhdr));
1464 skb_set_mac_header(reply, 0);
1465
1466 ns = (struct nd_msg *)skb_transport_header(request);
1467
1468 daddr = eth_hdr(request)->h_source;
1469 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1470 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1471 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1472 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1473 break;
1474 }
1475 }
1476
1477 /* Ethernet header */
1478 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1479 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1480 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1481 reply->protocol = htons(ETH_P_IPV6);
1482
1483 skb_pull(reply, sizeof(struct ethhdr));
1484 skb_set_network_header(reply, 0);
1485 skb_put(reply, sizeof(struct ipv6hdr));
1486
1487 /* IPv6 header */
1488
1489 pip6 = ipv6_hdr(reply);
1490 memset(pip6, 0, sizeof(struct ipv6hdr));
1491 pip6->version = 6;
1492 pip6->priority = ipv6_hdr(request)->priority;
1493 pip6->nexthdr = IPPROTO_ICMPV6;
1494 pip6->hop_limit = 255;
1495 pip6->daddr = ipv6_hdr(request)->saddr;
1496 pip6->saddr = *(struct in6_addr *)n->primary_key;
1497
1498 skb_pull(reply, sizeof(struct ipv6hdr));
1499 skb_set_transport_header(reply, 0);
1500
1501 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1502
1503 /* Neighbor Advertisement */
1504 memset(na, 0, sizeof(*na)+na_olen);
1505 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1506 na->icmph.icmp6_router = isrouter;
1507 na->icmph.icmp6_override = 1;
1508 na->icmph.icmp6_solicited = 1;
1509 na->target = ns->target;
1510 ether_addr_copy(&na->opt[2], n->ha);
1511 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1512 na->opt[1] = na_olen >> 3;
1513
1514 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1515 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1516 csum_partial(na, sizeof(*na)+na_olen, 0));
1517
1518 pip6->payload_len = htons(sizeof(*na)+na_olen);
1519
1520 skb_push(reply, sizeof(struct ipv6hdr));
1521
1522 reply->ip_summed = CHECKSUM_UNNECESSARY;
1523
1524 return reply;
1525 }
1526
1527 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1528 {
1529 struct vxlan_dev *vxlan = netdev_priv(dev);
1530 struct nd_msg *msg;
1531 const struct ipv6hdr *iphdr;
1532 const struct in6_addr *saddr, *daddr;
1533 struct neighbour *n;
1534 struct inet6_dev *in6_dev;
1535
1536 in6_dev = __in6_dev_get(dev);
1537 if (!in6_dev)
1538 goto out;
1539
1540 iphdr = ipv6_hdr(skb);
1541 saddr = &iphdr->saddr;
1542 daddr = &iphdr->daddr;
1543
1544 msg = (struct nd_msg *)skb_transport_header(skb);
1545 if (msg->icmph.icmp6_code != 0 ||
1546 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1547 goto out;
1548
1549 if (ipv6_addr_loopback(daddr) ||
1550 ipv6_addr_is_multicast(&msg->target))
1551 goto out;
1552
1553 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1554
1555 if (n) {
1556 struct vxlan_fdb *f;
1557 struct sk_buff *reply;
1558
1559 if (!(n->nud_state & NUD_CONNECTED)) {
1560 neigh_release(n);
1561 goto out;
1562 }
1563
1564 f = vxlan_find_mac(vxlan, n->ha);
1565 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1566 /* bridge-local neighbor */
1567 neigh_release(n);
1568 goto out;
1569 }
1570
1571 reply = vxlan_na_create(skb, n,
1572 !!(f ? f->flags & NTF_ROUTER : 0));
1573
1574 neigh_release(n);
1575
1576 if (reply == NULL)
1577 goto out;
1578
1579 if (netif_rx_ni(reply) == NET_RX_DROP)
1580 dev->stats.rx_dropped++;
1581
1582 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1583 union vxlan_addr ipa = {
1584 .sin6.sin6_addr = msg->target,
1585 .sin6.sin6_family = AF_INET6,
1586 };
1587
1588 vxlan_ip_miss(dev, &ipa);
1589 }
1590
1591 out:
1592 consume_skb(skb);
1593 return NETDEV_TX_OK;
1594 }
1595 #endif
1596
1597 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1598 {
1599 struct vxlan_dev *vxlan = netdev_priv(dev);
1600 struct neighbour *n;
1601
1602 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1603 return false;
1604
1605 n = NULL;
1606 switch (ntohs(eth_hdr(skb)->h_proto)) {
1607 case ETH_P_IP:
1608 {
1609 struct iphdr *pip;
1610
1611 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1612 return false;
1613 pip = ip_hdr(skb);
1614 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1615 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1616 union vxlan_addr ipa = {
1617 .sin.sin_addr.s_addr = pip->daddr,
1618 .sin.sin_family = AF_INET,
1619 };
1620
1621 vxlan_ip_miss(dev, &ipa);
1622 return false;
1623 }
1624
1625 break;
1626 }
1627 #if IS_ENABLED(CONFIG_IPV6)
1628 case ETH_P_IPV6:
1629 {
1630 struct ipv6hdr *pip6;
1631
1632 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1633 return false;
1634 pip6 = ipv6_hdr(skb);
1635 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1636 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1637 union vxlan_addr ipa = {
1638 .sin6.sin6_addr = pip6->daddr,
1639 .sin6.sin6_family = AF_INET6,
1640 };
1641
1642 vxlan_ip_miss(dev, &ipa);
1643 return false;
1644 }
1645
1646 break;
1647 }
1648 #endif
1649 default:
1650 return false;
1651 }
1652
1653 if (n) {
1654 bool diff;
1655
1656 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1657 if (diff) {
1658 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1659 dev->addr_len);
1660 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1661 }
1662 neigh_release(n);
1663 return diff;
1664 }
1665
1666 return false;
1667 }
1668
1669 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1670 struct vxlan_metadata *md)
1671 {
1672 struct vxlanhdr_gbp *gbp;
1673
1674 if (!md->gbp)
1675 return;
1676
1677 gbp = (struct vxlanhdr_gbp *)vxh;
1678 vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1679
1680 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1681 gbp->dont_learn = 1;
1682
1683 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1684 gbp->policy_applied = 1;
1685
1686 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1687 }
1688
1689 #if IS_ENABLED(CONFIG_IPV6)
1690 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1691 struct sk_buff *skb,
1692 struct net_device *dev, struct in6_addr *saddr,
1693 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1694 __be16 src_port, __be16 dst_port, __be32 vni,
1695 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1696 {
1697 struct vxlanhdr *vxh;
1698 int min_headroom;
1699 int err;
1700 bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1701 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1702 u16 hdrlen = sizeof(struct vxlanhdr);
1703
1704 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1705 skb->ip_summed == CHECKSUM_PARTIAL) {
1706 int csum_start = skb_checksum_start_offset(skb);
1707
1708 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1709 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1710 (skb->csum_offset == offsetof(struct udphdr, check) ||
1711 skb->csum_offset == offsetof(struct tcphdr, check))) {
1712 udp_sum = false;
1713 type |= SKB_GSO_TUNNEL_REMCSUM;
1714 }
1715 }
1716
1717 skb_scrub_packet(skb, xnet);
1718
1719 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1720 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1721 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1722
1723 /* Need space for new headers (invalidates iph ptr) */
1724 err = skb_cow_head(skb, min_headroom);
1725 if (unlikely(err)) {
1726 kfree_skb(skb);
1727 goto err;
1728 }
1729
1730 skb = vlan_hwaccel_push_inside(skb);
1731 if (WARN_ON(!skb)) {
1732 err = -ENOMEM;
1733 goto err;
1734 }
1735
1736 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1737 if (IS_ERR(skb)) {
1738 err = -EINVAL;
1739 goto err;
1740 }
1741
1742 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1743 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1744 vxh->vx_vni = vni;
1745
1746 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1747 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1748 VXLAN_RCO_SHIFT;
1749
1750 if (skb->csum_offset == offsetof(struct udphdr, check))
1751 data |= VXLAN_RCO_UDP;
1752
1753 vxh->vx_vni |= htonl(data);
1754 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1755
1756 if (!skb_is_gso(skb)) {
1757 skb->ip_summed = CHECKSUM_NONE;
1758 skb->encapsulation = 0;
1759 }
1760 }
1761
1762 if (vxflags & VXLAN_F_GBP)
1763 vxlan_build_gbp_hdr(vxh, vxflags, md);
1764
1765 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1766
1767 udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1768 ttl, src_port, dst_port,
1769 !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1770 return 0;
1771 err:
1772 dst_release(dst);
1773 return err;
1774 }
1775 #endif
1776
1777 static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
1778 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1779 __be16 src_port, __be16 dst_port, __be32 vni,
1780 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1781 {
1782 struct vxlanhdr *vxh;
1783 int min_headroom;
1784 int err;
1785 bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1786 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1787 u16 hdrlen = sizeof(struct vxlanhdr);
1788
1789 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1790 skb->ip_summed == CHECKSUM_PARTIAL) {
1791 int csum_start = skb_checksum_start_offset(skb);
1792
1793 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1794 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1795 (skb->csum_offset == offsetof(struct udphdr, check) ||
1796 skb->csum_offset == offsetof(struct tcphdr, check))) {
1797 udp_sum = false;
1798 type |= SKB_GSO_TUNNEL_REMCSUM;
1799 }
1800 }
1801
1802 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1803 + VXLAN_HLEN + sizeof(struct iphdr)
1804 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1805
1806 /* Need space for new headers (invalidates iph ptr) */
1807 err = skb_cow_head(skb, min_headroom);
1808 if (unlikely(err)) {
1809 kfree_skb(skb);
1810 return err;
1811 }
1812
1813 skb = vlan_hwaccel_push_inside(skb);
1814 if (WARN_ON(!skb))
1815 return -ENOMEM;
1816
1817 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1818 if (IS_ERR(skb))
1819 return PTR_ERR(skb);
1820
1821 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1822 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1823 vxh->vx_vni = vni;
1824
1825 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1826 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1827 VXLAN_RCO_SHIFT;
1828
1829 if (skb->csum_offset == offsetof(struct udphdr, check))
1830 data |= VXLAN_RCO_UDP;
1831
1832 vxh->vx_vni |= htonl(data);
1833 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1834
1835 if (!skb_is_gso(skb)) {
1836 skb->ip_summed = CHECKSUM_NONE;
1837 skb->encapsulation = 0;
1838 }
1839 }
1840
1841 if (vxflags & VXLAN_F_GBP)
1842 vxlan_build_gbp_hdr(vxh, vxflags, md);
1843
1844 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1845
1846 return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
1847 ttl, df, src_port, dst_port, xnet,
1848 !(vxflags & VXLAN_F_UDP_CSUM));
1849 }
1850
1851 /* Bypass encapsulation if the destination is local */
1852 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1853 struct vxlan_dev *dst_vxlan)
1854 {
1855 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1856 union vxlan_addr loopback;
1857 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1858 struct net_device *dev = skb->dev;
1859 int len = skb->len;
1860
1861 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1862 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1863 skb->pkt_type = PACKET_HOST;
1864 skb->encapsulation = 0;
1865 skb->dev = dst_vxlan->dev;
1866 __skb_pull(skb, skb_network_offset(skb));
1867
1868 if (remote_ip->sa.sa_family == AF_INET) {
1869 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1870 loopback.sa.sa_family = AF_INET;
1871 #if IS_ENABLED(CONFIG_IPV6)
1872 } else {
1873 loopback.sin6.sin6_addr = in6addr_loopback;
1874 loopback.sa.sa_family = AF_INET6;
1875 #endif
1876 }
1877
1878 if (dst_vxlan->flags & VXLAN_F_LEARN)
1879 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1880
1881 u64_stats_update_begin(&tx_stats->syncp);
1882 tx_stats->tx_packets++;
1883 tx_stats->tx_bytes += len;
1884 u64_stats_update_end(&tx_stats->syncp);
1885
1886 if (netif_rx(skb) == NET_RX_SUCCESS) {
1887 u64_stats_update_begin(&rx_stats->syncp);
1888 rx_stats->rx_packets++;
1889 rx_stats->rx_bytes += len;
1890 u64_stats_update_end(&rx_stats->syncp);
1891 } else {
1892 dev->stats.rx_dropped++;
1893 }
1894 }
1895
1896 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1897 struct vxlan_rdst *rdst, bool did_rsc)
1898 {
1899 struct ip_tunnel_info *info;
1900 struct vxlan_dev *vxlan = netdev_priv(dev);
1901 struct sock *sk;
1902 struct rtable *rt = NULL;
1903 const struct iphdr *old_iph;
1904 struct flowi4 fl4;
1905 union vxlan_addr *dst;
1906 union vxlan_addr remote_ip;
1907 struct vxlan_metadata _md;
1908 struct vxlan_metadata *md = &_md;
1909 __be16 src_port = 0, dst_port;
1910 u32 vni;
1911 __be16 df = 0;
1912 __u8 tos, ttl;
1913 int err;
1914 u32 flags = vxlan->flags;
1915
1916 info = skb_tunnel_info(skb);
1917
1918 if (rdst) {
1919 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1920 vni = rdst->remote_vni;
1921 dst = &rdst->remote_ip;
1922 } else {
1923 if (!info) {
1924 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1925 dev->name);
1926 goto drop;
1927 }
1928 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1929 vni = be64_to_cpu(info->key.tun_id);
1930 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1931 if (remote_ip.sa.sa_family == AF_INET)
1932 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1933 else
1934 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1935 dst = &remote_ip;
1936 }
1937
1938 if (vxlan_addr_any(dst)) {
1939 if (did_rsc) {
1940 /* short-circuited back to local bridge */
1941 vxlan_encap_bypass(skb, vxlan, vxlan);
1942 return;
1943 }
1944 goto drop;
1945 }
1946
1947 old_iph = ip_hdr(skb);
1948
1949 ttl = vxlan->cfg.ttl;
1950 if (!ttl && vxlan_addr_multicast(dst))
1951 ttl = 1;
1952
1953 tos = vxlan->cfg.tos;
1954 if (tos == 1)
1955 tos = ip_tunnel_get_dsfield(old_iph, skb);
1956
1957 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1958 vxlan->cfg.port_max, true);
1959
1960 if (info) {
1961 if (info->key.tun_flags & TUNNEL_CSUM)
1962 flags |= VXLAN_F_UDP_CSUM;
1963 else
1964 flags &= ~VXLAN_F_UDP_CSUM;
1965
1966 ttl = info->key.ttl;
1967 tos = info->key.tos;
1968
1969 if (info->options_len)
1970 md = ip_tunnel_info_opts(info);
1971 } else {
1972 md->gbp = skb->mark;
1973 }
1974
1975 if (dst->sa.sa_family == AF_INET) {
1976 if (!vxlan->vn4_sock)
1977 goto drop;
1978 sk = vxlan->vn4_sock->sock->sk;
1979
1980 if (info && (info->key.tun_flags & TUNNEL_DONT_FRAGMENT))
1981 df = htons(IP_DF);
1982
1983 memset(&fl4, 0, sizeof(fl4));
1984 fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
1985 fl4.flowi4_tos = RT_TOS(tos);
1986 fl4.flowi4_mark = skb->mark;
1987 fl4.flowi4_proto = IPPROTO_UDP;
1988 fl4.daddr = dst->sin.sin_addr.s_addr;
1989 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1990
1991 rt = ip_route_output_key(vxlan->net, &fl4);
1992 if (IS_ERR(rt)) {
1993 netdev_dbg(dev, "no route to %pI4\n",
1994 &dst->sin.sin_addr.s_addr);
1995 dev->stats.tx_carrier_errors++;
1996 goto tx_error;
1997 }
1998
1999 if (rt->dst.dev == dev) {
2000 netdev_dbg(dev, "circular route to %pI4\n",
2001 &dst->sin.sin_addr.s_addr);
2002 dev->stats.collisions++;
2003 goto rt_tx_error;
2004 }
2005
2006 /* Bypass encapsulation if the destination is local */
2007 if (rt->rt_flags & RTCF_LOCAL &&
2008 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2009 struct vxlan_dev *dst_vxlan;
2010
2011 ip_rt_put(rt);
2012 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2013 dst->sa.sa_family, dst_port,
2014 vxlan->flags);
2015 if (!dst_vxlan)
2016 goto tx_error;
2017 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2018 return;
2019 }
2020
2021 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2022 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2023 err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
2024 dst->sin.sin_addr.s_addr, tos, ttl, df,
2025 src_port, dst_port, htonl(vni << 8), md,
2026 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2027 flags);
2028 if (err < 0) {
2029 /* skb is already freed. */
2030 skb = NULL;
2031 goto rt_tx_error;
2032 }
2033
2034 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
2035 #if IS_ENABLED(CONFIG_IPV6)
2036 } else {
2037 struct dst_entry *ndst;
2038 struct flowi6 fl6;
2039 u32 rt6i_flags;
2040
2041 if (!vxlan->vn6_sock)
2042 goto drop;
2043 sk = vxlan->vn6_sock->sock->sk;
2044
2045 memset(&fl6, 0, sizeof(fl6));
2046 fl6.flowi6_oif = rdst ? rdst->remote_ifindex : 0;
2047 fl6.daddr = dst->sin6.sin6_addr;
2048 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
2049 fl6.flowi6_mark = skb->mark;
2050 fl6.flowi6_proto = IPPROTO_UDP;
2051
2052 if (ipv6_stub->ipv6_dst_lookup(vxlan->net, sk, &ndst, &fl6)) {
2053 netdev_dbg(dev, "no route to %pI6\n",
2054 &dst->sin6.sin6_addr);
2055 dev->stats.tx_carrier_errors++;
2056 goto tx_error;
2057 }
2058
2059 if (ndst->dev == dev) {
2060 netdev_dbg(dev, "circular route to %pI6\n",
2061 &dst->sin6.sin6_addr);
2062 dst_release(ndst);
2063 dev->stats.collisions++;
2064 goto tx_error;
2065 }
2066
2067 /* Bypass encapsulation if the destination is local */
2068 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2069 if (rt6i_flags & RTF_LOCAL &&
2070 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2071 struct vxlan_dev *dst_vxlan;
2072
2073 dst_release(ndst);
2074 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2075 dst->sa.sa_family, dst_port,
2076 vxlan->flags);
2077 if (!dst_vxlan)
2078 goto tx_error;
2079 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2080 return;
2081 }
2082
2083 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2084 err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
2085 0, ttl, src_port, dst_port, htonl(vni << 8), md,
2086 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2087 flags);
2088 #endif
2089 }
2090
2091 return;
2092
2093 drop:
2094 dev->stats.tx_dropped++;
2095 goto tx_free;
2096
2097 rt_tx_error:
2098 ip_rt_put(rt);
2099 tx_error:
2100 dev->stats.tx_errors++;
2101 tx_free:
2102 dev_kfree_skb(skb);
2103 }
2104
2105 /* Transmit local packets over Vxlan
2106 *
2107 * Outer IP header inherits ECN and DF from inner header.
2108 * Outer UDP destination is the VXLAN assigned port.
2109 * source port is based on hash of flow
2110 */
2111 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2112 {
2113 struct vxlan_dev *vxlan = netdev_priv(dev);
2114 const struct ip_tunnel_info *info;
2115 struct ethhdr *eth;
2116 bool did_rsc = false;
2117 struct vxlan_rdst *rdst, *fdst = NULL;
2118 struct vxlan_fdb *f;
2119
2120 info = skb_tunnel_info(skb);
2121
2122 skb_reset_mac_header(skb);
2123 eth = eth_hdr(skb);
2124
2125 if ((vxlan->flags & VXLAN_F_PROXY)) {
2126 if (ntohs(eth->h_proto) == ETH_P_ARP)
2127 return arp_reduce(dev, skb);
2128 #if IS_ENABLED(CONFIG_IPV6)
2129 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2130 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2131 + sizeof(struct nd_msg)) &&
2132 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2133 struct nd_msg *msg;
2134
2135 msg = (struct nd_msg *)skb_transport_header(skb);
2136 if (msg->icmph.icmp6_code == 0 &&
2137 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2138 return neigh_reduce(dev, skb);
2139 }
2140 eth = eth_hdr(skb);
2141 #endif
2142 }
2143
2144 if (vxlan->flags & VXLAN_F_COLLECT_METADATA &&
2145 info && info->mode & IP_TUNNEL_INFO_TX) {
2146 vxlan_xmit_one(skb, dev, NULL, false);
2147 return NETDEV_TX_OK;
2148 }
2149
2150 f = vxlan_find_mac(vxlan, eth->h_dest);
2151 did_rsc = false;
2152
2153 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2154 (ntohs(eth->h_proto) == ETH_P_IP ||
2155 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2156 did_rsc = route_shortcircuit(dev, skb);
2157 if (did_rsc)
2158 f = vxlan_find_mac(vxlan, eth->h_dest);
2159 }
2160
2161 if (f == NULL) {
2162 f = vxlan_find_mac(vxlan, all_zeros_mac);
2163 if (f == NULL) {
2164 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2165 !is_multicast_ether_addr(eth->h_dest))
2166 vxlan_fdb_miss(vxlan, eth->h_dest);
2167
2168 dev->stats.tx_dropped++;
2169 kfree_skb(skb);
2170 return NETDEV_TX_OK;
2171 }
2172 }
2173
2174 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2175 struct sk_buff *skb1;
2176
2177 if (!fdst) {
2178 fdst = rdst;
2179 continue;
2180 }
2181 skb1 = skb_clone(skb, GFP_ATOMIC);
2182 if (skb1)
2183 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2184 }
2185
2186 if (fdst)
2187 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2188 else
2189 kfree_skb(skb);
2190 return NETDEV_TX_OK;
2191 }
2192
2193 /* Walk the forwarding table and purge stale entries */
2194 static void vxlan_cleanup(unsigned long arg)
2195 {
2196 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2197 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2198 unsigned int h;
2199
2200 if (!netif_running(vxlan->dev))
2201 return;
2202
2203 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2204 struct hlist_node *p, *n;
2205
2206 spin_lock_bh(&vxlan->hash_lock);
2207 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2208 struct vxlan_fdb *f
2209 = container_of(p, struct vxlan_fdb, hlist);
2210 unsigned long timeout;
2211
2212 if (f->state & NUD_PERMANENT)
2213 continue;
2214
2215 timeout = f->used + vxlan->cfg.age_interval * HZ;
2216 if (time_before_eq(timeout, jiffies)) {
2217 netdev_dbg(vxlan->dev,
2218 "garbage collect %pM\n",
2219 f->eth_addr);
2220 f->state = NUD_STALE;
2221 vxlan_fdb_destroy(vxlan, f);
2222 } else if (time_before(timeout, next_timer))
2223 next_timer = timeout;
2224 }
2225 spin_unlock_bh(&vxlan->hash_lock);
2226 }
2227
2228 mod_timer(&vxlan->age_timer, next_timer);
2229 }
2230
2231 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2232 {
2233 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2234 __u32 vni = vxlan->default_dst.remote_vni;
2235
2236 spin_lock(&vn->sock_lock);
2237 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2238 spin_unlock(&vn->sock_lock);
2239 }
2240
2241 /* Setup stats when device is created */
2242 static int vxlan_init(struct net_device *dev)
2243 {
2244 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2245 if (!dev->tstats)
2246 return -ENOMEM;
2247
2248 return 0;
2249 }
2250
2251 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2252 {
2253 struct vxlan_fdb *f;
2254
2255 spin_lock_bh(&vxlan->hash_lock);
2256 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2257 if (f)
2258 vxlan_fdb_destroy(vxlan, f);
2259 spin_unlock_bh(&vxlan->hash_lock);
2260 }
2261
2262 static void vxlan_uninit(struct net_device *dev)
2263 {
2264 struct vxlan_dev *vxlan = netdev_priv(dev);
2265
2266 vxlan_fdb_delete_default(vxlan);
2267
2268 free_percpu(dev->tstats);
2269 }
2270
2271 /* Start ageing timer and join group when device is brought up */
2272 static int vxlan_open(struct net_device *dev)
2273 {
2274 struct vxlan_dev *vxlan = netdev_priv(dev);
2275 int ret;
2276
2277 ret = vxlan_sock_add(vxlan);
2278 if (ret < 0)
2279 return ret;
2280
2281 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2282 ret = vxlan_igmp_join(vxlan);
2283 if (ret == -EADDRINUSE)
2284 ret = 0;
2285 if (ret) {
2286 vxlan_sock_release(vxlan);
2287 return ret;
2288 }
2289 }
2290
2291 if (vxlan->cfg.age_interval)
2292 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2293
2294 return ret;
2295 }
2296
2297 /* Purge the forwarding table */
2298 static void vxlan_flush(struct vxlan_dev *vxlan)
2299 {
2300 unsigned int h;
2301
2302 spin_lock_bh(&vxlan->hash_lock);
2303 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2304 struct hlist_node *p, *n;
2305 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2306 struct vxlan_fdb *f
2307 = container_of(p, struct vxlan_fdb, hlist);
2308 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2309 if (!is_zero_ether_addr(f->eth_addr))
2310 vxlan_fdb_destroy(vxlan, f);
2311 }
2312 }
2313 spin_unlock_bh(&vxlan->hash_lock);
2314 }
2315
2316 /* Cleanup timer and forwarding table on shutdown */
2317 static int vxlan_stop(struct net_device *dev)
2318 {
2319 struct vxlan_dev *vxlan = netdev_priv(dev);
2320 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2321 int ret = 0;
2322
2323 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2324 !vxlan_group_used(vn, vxlan))
2325 ret = vxlan_igmp_leave(vxlan);
2326
2327 del_timer_sync(&vxlan->age_timer);
2328
2329 vxlan_flush(vxlan);
2330 vxlan_sock_release(vxlan);
2331
2332 return ret;
2333 }
2334
2335 /* Stub, nothing needs to be done. */
2336 static void vxlan_set_multicast_list(struct net_device *dev)
2337 {
2338 }
2339
2340 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2341 {
2342 struct vxlan_dev *vxlan = netdev_priv(dev);
2343 struct vxlan_rdst *dst = &vxlan->default_dst;
2344 struct net_device *lowerdev;
2345 int max_mtu;
2346
2347 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2348 if (lowerdev == NULL)
2349 return eth_change_mtu(dev, new_mtu);
2350
2351 if (dst->remote_ip.sa.sa_family == AF_INET6)
2352 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2353 else
2354 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2355
2356 if (new_mtu < 68 || new_mtu > max_mtu)
2357 return -EINVAL;
2358
2359 dev->mtu = new_mtu;
2360 return 0;
2361 }
2362
2363 static int egress_ipv4_tun_info(struct net_device *dev, struct sk_buff *skb,
2364 struct ip_tunnel_info *info,
2365 __be16 sport, __be16 dport)
2366 {
2367 struct vxlan_dev *vxlan = netdev_priv(dev);
2368 struct rtable *rt;
2369 struct flowi4 fl4;
2370
2371 memset(&fl4, 0, sizeof(fl4));
2372 fl4.flowi4_tos = RT_TOS(info->key.tos);
2373 fl4.flowi4_mark = skb->mark;
2374 fl4.flowi4_proto = IPPROTO_UDP;
2375 fl4.daddr = info->key.u.ipv4.dst;
2376
2377 rt = ip_route_output_key(vxlan->net, &fl4);
2378 if (IS_ERR(rt))
2379 return PTR_ERR(rt);
2380 ip_rt_put(rt);
2381
2382 info->key.u.ipv4.src = fl4.saddr;
2383 info->key.tp_src = sport;
2384 info->key.tp_dst = dport;
2385 return 0;
2386 }
2387
2388 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2389 {
2390 struct vxlan_dev *vxlan = netdev_priv(dev);
2391 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2392 __be16 sport, dport;
2393
2394 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2395 vxlan->cfg.port_max, true);
2396 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2397
2398 if (ip_tunnel_info_af(info) == AF_INET)
2399 return egress_ipv4_tun_info(dev, skb, info, sport, dport);
2400 return -EINVAL;
2401 }
2402
2403 static const struct net_device_ops vxlan_netdev_ops = {
2404 .ndo_init = vxlan_init,
2405 .ndo_uninit = vxlan_uninit,
2406 .ndo_open = vxlan_open,
2407 .ndo_stop = vxlan_stop,
2408 .ndo_start_xmit = vxlan_xmit,
2409 .ndo_get_stats64 = ip_tunnel_get_stats64,
2410 .ndo_set_rx_mode = vxlan_set_multicast_list,
2411 .ndo_change_mtu = vxlan_change_mtu,
2412 .ndo_validate_addr = eth_validate_addr,
2413 .ndo_set_mac_address = eth_mac_addr,
2414 .ndo_fdb_add = vxlan_fdb_add,
2415 .ndo_fdb_del = vxlan_fdb_delete,
2416 .ndo_fdb_dump = vxlan_fdb_dump,
2417 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2418 };
2419
2420 /* Info for udev, that this is a virtual tunnel endpoint */
2421 static struct device_type vxlan_type = {
2422 .name = "vxlan",
2423 };
2424
2425 /* Calls the ndo_add_vxlan_port of the caller in order to
2426 * supply the listening VXLAN udp ports. Callers are expected
2427 * to implement the ndo_add_vxlan_port.
2428 */
2429 void vxlan_get_rx_port(struct net_device *dev)
2430 {
2431 struct vxlan_sock *vs;
2432 struct net *net = dev_net(dev);
2433 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2434 sa_family_t sa_family;
2435 __be16 port;
2436 unsigned int i;
2437
2438 spin_lock(&vn->sock_lock);
2439 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2440 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2441 port = inet_sk(vs->sock->sk)->inet_sport;
2442 sa_family = vxlan_get_sk_family(vs);
2443 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2444 port);
2445 }
2446 }
2447 spin_unlock(&vn->sock_lock);
2448 }
2449 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2450
2451 /* Initialize the device structure. */
2452 static void vxlan_setup(struct net_device *dev)
2453 {
2454 struct vxlan_dev *vxlan = netdev_priv(dev);
2455 unsigned int h;
2456
2457 eth_hw_addr_random(dev);
2458 ether_setup(dev);
2459
2460 dev->netdev_ops = &vxlan_netdev_ops;
2461 dev->destructor = free_netdev;
2462 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2463
2464 dev->features |= NETIF_F_LLTX;
2465 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2466 dev->features |= NETIF_F_RXCSUM;
2467 dev->features |= NETIF_F_GSO_SOFTWARE;
2468
2469 dev->vlan_features = dev->features;
2470 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2471 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2472 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2473 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2474 netif_keep_dst(dev);
2475 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2476
2477 INIT_LIST_HEAD(&vxlan->next);
2478 spin_lock_init(&vxlan->hash_lock);
2479
2480 init_timer_deferrable(&vxlan->age_timer);
2481 vxlan->age_timer.function = vxlan_cleanup;
2482 vxlan->age_timer.data = (unsigned long) vxlan;
2483
2484 vxlan->cfg.dst_port = htons(vxlan_port);
2485
2486 vxlan->dev = dev;
2487
2488 gro_cells_init(&vxlan->gro_cells, dev);
2489
2490 for (h = 0; h < FDB_HASH_SIZE; ++h)
2491 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2492 }
2493
2494 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2495 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2496 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2497 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2498 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2499 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2500 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2501 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2502 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2503 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2504 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2505 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2506 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2507 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2508 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2509 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2510 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2511 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2512 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2513 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2514 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2515 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2516 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2517 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2518 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2519 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2520 };
2521
2522 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2523 {
2524 if (tb[IFLA_ADDRESS]) {
2525 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2526 pr_debug("invalid link address (not ethernet)\n");
2527 return -EINVAL;
2528 }
2529
2530 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2531 pr_debug("invalid all zero ethernet address\n");
2532 return -EADDRNOTAVAIL;
2533 }
2534 }
2535
2536 if (!data)
2537 return -EINVAL;
2538
2539 if (data[IFLA_VXLAN_ID]) {
2540 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2541 if (id >= VXLAN_VID_MASK)
2542 return -ERANGE;
2543 }
2544
2545 if (data[IFLA_VXLAN_PORT_RANGE]) {
2546 const struct ifla_vxlan_port_range *p
2547 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2548
2549 if (ntohs(p->high) < ntohs(p->low)) {
2550 pr_debug("port range %u .. %u not valid\n",
2551 ntohs(p->low), ntohs(p->high));
2552 return -EINVAL;
2553 }
2554 }
2555
2556 return 0;
2557 }
2558
2559 static void vxlan_get_drvinfo(struct net_device *netdev,
2560 struct ethtool_drvinfo *drvinfo)
2561 {
2562 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2563 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2564 }
2565
2566 static const struct ethtool_ops vxlan_ethtool_ops = {
2567 .get_drvinfo = vxlan_get_drvinfo,
2568 .get_link = ethtool_op_get_link,
2569 };
2570
2571 static void vxlan_del_work(struct work_struct *work)
2572 {
2573 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2574 udp_tunnel_sock_release(vs->sock);
2575 kfree_rcu(vs, rcu);
2576 }
2577
2578 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2579 __be16 port, u32 flags)
2580 {
2581 struct socket *sock;
2582 struct udp_port_cfg udp_conf;
2583 int err;
2584
2585 memset(&udp_conf, 0, sizeof(udp_conf));
2586
2587 if (ipv6) {
2588 udp_conf.family = AF_INET6;
2589 udp_conf.use_udp6_rx_checksums =
2590 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2591 udp_conf.ipv6_v6only = 1;
2592 } else {
2593 udp_conf.family = AF_INET;
2594 }
2595
2596 udp_conf.local_udp_port = port;
2597
2598 /* Open UDP socket */
2599 err = udp_sock_create(net, &udp_conf, &sock);
2600 if (err < 0)
2601 return ERR_PTR(err);
2602
2603 return sock;
2604 }
2605
2606 /* Create new listen socket if needed */
2607 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2608 __be16 port, u32 flags)
2609 {
2610 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2611 struct vxlan_sock *vs;
2612 struct socket *sock;
2613 unsigned int h;
2614 struct udp_tunnel_sock_cfg tunnel_cfg;
2615
2616 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2617 if (!vs)
2618 return ERR_PTR(-ENOMEM);
2619
2620 for (h = 0; h < VNI_HASH_SIZE; ++h)
2621 INIT_HLIST_HEAD(&vs->vni_list[h]);
2622
2623 INIT_WORK(&vs->del_work, vxlan_del_work);
2624
2625 sock = vxlan_create_sock(net, ipv6, port, flags);
2626 if (IS_ERR(sock)) {
2627 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2628 PTR_ERR(sock));
2629 kfree(vs);
2630 return ERR_CAST(sock);
2631 }
2632
2633 vs->sock = sock;
2634 atomic_set(&vs->refcnt, 1);
2635 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2636
2637 /* Initialize the vxlan udp offloads structure */
2638 vs->udp_offloads.port = port;
2639 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2640 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2641
2642 spin_lock(&vn->sock_lock);
2643 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2644 vxlan_notify_add_rx_port(vs);
2645 spin_unlock(&vn->sock_lock);
2646
2647 /* Mark socket as an encapsulation socket. */
2648 tunnel_cfg.sk_user_data = vs;
2649 tunnel_cfg.encap_type = 1;
2650 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2651 tunnel_cfg.encap_destroy = NULL;
2652
2653 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2654
2655 return vs;
2656 }
2657
2658 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2659 {
2660 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2661 struct vxlan_sock *vs = NULL;
2662
2663 if (!vxlan->cfg.no_share) {
2664 spin_lock(&vn->sock_lock);
2665 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2666 vxlan->cfg.dst_port, vxlan->flags);
2667 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2668 spin_unlock(&vn->sock_lock);
2669 return -EBUSY;
2670 }
2671 spin_unlock(&vn->sock_lock);
2672 }
2673 if (!vs)
2674 vs = vxlan_socket_create(vxlan->net, ipv6,
2675 vxlan->cfg.dst_port, vxlan->flags);
2676 if (IS_ERR(vs))
2677 return PTR_ERR(vs);
2678 #if IS_ENABLED(CONFIG_IPV6)
2679 if (ipv6)
2680 vxlan->vn6_sock = vs;
2681 else
2682 #endif
2683 vxlan->vn4_sock = vs;
2684 vxlan_vs_add_dev(vs, vxlan);
2685 return 0;
2686 }
2687
2688 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2689 {
2690 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2691 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2692 int ret = 0;
2693
2694 vxlan->vn4_sock = NULL;
2695 #if IS_ENABLED(CONFIG_IPV6)
2696 vxlan->vn6_sock = NULL;
2697 if (ipv6 || metadata)
2698 ret = __vxlan_sock_add(vxlan, true);
2699 #endif
2700 if (!ret && (!ipv6 || metadata))
2701 ret = __vxlan_sock_add(vxlan, false);
2702 if (ret < 0)
2703 vxlan_sock_release(vxlan);
2704 return ret;
2705 }
2706
2707 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2708 struct vxlan_config *conf)
2709 {
2710 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2711 struct vxlan_dev *vxlan = netdev_priv(dev);
2712 struct vxlan_rdst *dst = &vxlan->default_dst;
2713 unsigned short needed_headroom = ETH_HLEN;
2714 int err;
2715 bool use_ipv6 = false;
2716 __be16 default_port = vxlan->cfg.dst_port;
2717
2718 vxlan->net = src_net;
2719
2720 dst->remote_vni = conf->vni;
2721
2722 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2723
2724 /* Unless IPv6 is explicitly requested, assume IPv4 */
2725 if (!dst->remote_ip.sa.sa_family)
2726 dst->remote_ip.sa.sa_family = AF_INET;
2727
2728 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2729 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2730 if (!IS_ENABLED(CONFIG_IPV6))
2731 return -EPFNOSUPPORT;
2732 use_ipv6 = true;
2733 vxlan->flags |= VXLAN_F_IPV6;
2734 }
2735
2736 if (conf->remote_ifindex) {
2737 struct net_device *lowerdev
2738 = __dev_get_by_index(src_net, conf->remote_ifindex);
2739
2740 dst->remote_ifindex = conf->remote_ifindex;
2741
2742 if (!lowerdev) {
2743 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2744 return -ENODEV;
2745 }
2746
2747 #if IS_ENABLED(CONFIG_IPV6)
2748 if (use_ipv6) {
2749 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2750 if (idev && idev->cnf.disable_ipv6) {
2751 pr_info("IPv6 is disabled via sysctl\n");
2752 return -EPERM;
2753 }
2754 }
2755 #endif
2756
2757 if (!conf->mtu)
2758 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2759
2760 needed_headroom = lowerdev->hard_header_len;
2761 }
2762
2763 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2764 needed_headroom += VXLAN6_HEADROOM;
2765 else
2766 needed_headroom += VXLAN_HEADROOM;
2767 dev->needed_headroom = needed_headroom;
2768
2769 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2770 if (!vxlan->cfg.dst_port)
2771 vxlan->cfg.dst_port = default_port;
2772 vxlan->flags |= conf->flags;
2773
2774 if (!vxlan->cfg.age_interval)
2775 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2776
2777 if (vxlan_find_vni(src_net, conf->vni, use_ipv6 ? AF_INET6 : AF_INET,
2778 vxlan->cfg.dst_port, vxlan->flags))
2779 return -EEXIST;
2780
2781 dev->ethtool_ops = &vxlan_ethtool_ops;
2782
2783 /* create an fdb entry for a valid default destination */
2784 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2785 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2786 &vxlan->default_dst.remote_ip,
2787 NUD_REACHABLE|NUD_PERMANENT,
2788 NLM_F_EXCL|NLM_F_CREATE,
2789 vxlan->cfg.dst_port,
2790 vxlan->default_dst.remote_vni,
2791 vxlan->default_dst.remote_ifindex,
2792 NTF_SELF);
2793 if (err)
2794 return err;
2795 }
2796
2797 err = register_netdevice(dev);
2798 if (err) {
2799 vxlan_fdb_delete_default(vxlan);
2800 return err;
2801 }
2802
2803 list_add(&vxlan->next, &vn->vxlan_list);
2804
2805 return 0;
2806 }
2807
2808 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2809 u8 name_assign_type, struct vxlan_config *conf)
2810 {
2811 struct nlattr *tb[IFLA_MAX+1];
2812 struct net_device *dev;
2813 int err;
2814
2815 memset(&tb, 0, sizeof(tb));
2816
2817 dev = rtnl_create_link(net, name, name_assign_type,
2818 &vxlan_link_ops, tb);
2819 if (IS_ERR(dev))
2820 return dev;
2821
2822 err = vxlan_dev_configure(net, dev, conf);
2823 if (err < 0) {
2824 free_netdev(dev);
2825 return ERR_PTR(err);
2826 }
2827
2828 return dev;
2829 }
2830 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2831
2832 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2833 struct nlattr *tb[], struct nlattr *data[])
2834 {
2835 struct vxlan_config conf;
2836 int err;
2837
2838 memset(&conf, 0, sizeof(conf));
2839
2840 if (data[IFLA_VXLAN_ID])
2841 conf.vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2842
2843 if (data[IFLA_VXLAN_GROUP]) {
2844 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2845 } else if (data[IFLA_VXLAN_GROUP6]) {
2846 if (!IS_ENABLED(CONFIG_IPV6))
2847 return -EPFNOSUPPORT;
2848
2849 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2850 conf.remote_ip.sa.sa_family = AF_INET6;
2851 }
2852
2853 if (data[IFLA_VXLAN_LOCAL]) {
2854 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2855 conf.saddr.sa.sa_family = AF_INET;
2856 } else if (data[IFLA_VXLAN_LOCAL6]) {
2857 if (!IS_ENABLED(CONFIG_IPV6))
2858 return -EPFNOSUPPORT;
2859
2860 /* TODO: respect scope id */
2861 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2862 conf.saddr.sa.sa_family = AF_INET6;
2863 }
2864
2865 if (data[IFLA_VXLAN_LINK])
2866 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2867
2868 if (data[IFLA_VXLAN_TOS])
2869 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2870
2871 if (data[IFLA_VXLAN_TTL])
2872 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2873
2874 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2875 conf.flags |= VXLAN_F_LEARN;
2876
2877 if (data[IFLA_VXLAN_AGEING])
2878 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2879
2880 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2881 conf.flags |= VXLAN_F_PROXY;
2882
2883 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2884 conf.flags |= VXLAN_F_RSC;
2885
2886 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2887 conf.flags |= VXLAN_F_L2MISS;
2888
2889 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2890 conf.flags |= VXLAN_F_L3MISS;
2891
2892 if (data[IFLA_VXLAN_LIMIT])
2893 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2894
2895 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2896 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2897 conf.flags |= VXLAN_F_COLLECT_METADATA;
2898
2899 if (data[IFLA_VXLAN_PORT_RANGE]) {
2900 const struct ifla_vxlan_port_range *p
2901 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2902 conf.port_min = ntohs(p->low);
2903 conf.port_max = ntohs(p->high);
2904 }
2905
2906 if (data[IFLA_VXLAN_PORT])
2907 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2908
2909 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2910 conf.flags |= VXLAN_F_UDP_CSUM;
2911
2912 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2913 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2914 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2915
2916 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2917 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2918 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2919
2920 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2921 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2922 conf.flags |= VXLAN_F_REMCSUM_TX;
2923
2924 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2925 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2926 conf.flags |= VXLAN_F_REMCSUM_RX;
2927
2928 if (data[IFLA_VXLAN_GBP])
2929 conf.flags |= VXLAN_F_GBP;
2930
2931 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2932 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2933
2934 err = vxlan_dev_configure(src_net, dev, &conf);
2935 switch (err) {
2936 case -ENODEV:
2937 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2938 break;
2939
2940 case -EPERM:
2941 pr_info("IPv6 is disabled via sysctl\n");
2942 break;
2943
2944 case -EEXIST:
2945 pr_info("duplicate VNI %u\n", conf.vni);
2946 break;
2947 }
2948
2949 return err;
2950 }
2951
2952 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2953 {
2954 struct vxlan_dev *vxlan = netdev_priv(dev);
2955 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2956
2957 spin_lock(&vn->sock_lock);
2958 if (!hlist_unhashed(&vxlan->hlist))
2959 hlist_del_rcu(&vxlan->hlist);
2960 spin_unlock(&vn->sock_lock);
2961
2962 gro_cells_destroy(&vxlan->gro_cells);
2963 list_del(&vxlan->next);
2964 unregister_netdevice_queue(dev, head);
2965 }
2966
2967 static size_t vxlan_get_size(const struct net_device *dev)
2968 {
2969
2970 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2971 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2972 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2973 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2974 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2975 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2976 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2977 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2978 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2979 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2980 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2981 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
2982 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2983 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2984 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2985 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2986 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2987 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2988 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2989 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2990 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2991 0;
2992 }
2993
2994 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2995 {
2996 const struct vxlan_dev *vxlan = netdev_priv(dev);
2997 const struct vxlan_rdst *dst = &vxlan->default_dst;
2998 struct ifla_vxlan_port_range ports = {
2999 .low = htons(vxlan->cfg.port_min),
3000 .high = htons(vxlan->cfg.port_max),
3001 };
3002
3003 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
3004 goto nla_put_failure;
3005
3006 if (!vxlan_addr_any(&dst->remote_ip)) {
3007 if (dst->remote_ip.sa.sa_family == AF_INET) {
3008 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3009 dst->remote_ip.sin.sin_addr.s_addr))
3010 goto nla_put_failure;
3011 #if IS_ENABLED(CONFIG_IPV6)
3012 } else {
3013 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3014 &dst->remote_ip.sin6.sin6_addr))
3015 goto nla_put_failure;
3016 #endif
3017 }
3018 }
3019
3020 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3021 goto nla_put_failure;
3022
3023 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3024 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3025 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3026 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3027 goto nla_put_failure;
3028 #if IS_ENABLED(CONFIG_IPV6)
3029 } else {
3030 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3031 &vxlan->cfg.saddr.sin6.sin6_addr))
3032 goto nla_put_failure;
3033 #endif
3034 }
3035 }
3036
3037 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3038 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3039 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3040 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3041 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3042 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3043 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3044 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3045 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3046 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3047 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3048 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3049 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3050 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3051 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3052 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3053 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3054 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
3055 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3056 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3057 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3058 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3059 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3060 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3061 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3062 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3063 goto nla_put_failure;
3064
3065 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3066 goto nla_put_failure;
3067
3068 if (vxlan->flags & VXLAN_F_GBP &&
3069 nla_put_flag(skb, IFLA_VXLAN_GBP))
3070 goto nla_put_failure;
3071
3072 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3073 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3074 goto nla_put_failure;
3075
3076 return 0;
3077
3078 nla_put_failure:
3079 return -EMSGSIZE;
3080 }
3081
3082 static struct net *vxlan_get_link_net(const struct net_device *dev)
3083 {
3084 struct vxlan_dev *vxlan = netdev_priv(dev);
3085
3086 return vxlan->net;
3087 }
3088
3089 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3090 .kind = "vxlan",
3091 .maxtype = IFLA_VXLAN_MAX,
3092 .policy = vxlan_policy,
3093 .priv_size = sizeof(struct vxlan_dev),
3094 .setup = vxlan_setup,
3095 .validate = vxlan_validate,
3096 .newlink = vxlan_newlink,
3097 .dellink = vxlan_dellink,
3098 .get_size = vxlan_get_size,
3099 .fill_info = vxlan_fill_info,
3100 .get_link_net = vxlan_get_link_net,
3101 };
3102
3103 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3104 struct net_device *dev)
3105 {
3106 struct vxlan_dev *vxlan, *next;
3107 LIST_HEAD(list_kill);
3108
3109 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3110 struct vxlan_rdst *dst = &vxlan->default_dst;
3111
3112 /* In case we created vxlan device with carrier
3113 * and we loose the carrier due to module unload
3114 * we also need to remove vxlan device. In other
3115 * cases, it's not necessary and remote_ifindex
3116 * is 0 here, so no matches.
3117 */
3118 if (dst->remote_ifindex == dev->ifindex)
3119 vxlan_dellink(vxlan->dev, &list_kill);
3120 }
3121
3122 unregister_netdevice_many(&list_kill);
3123 }
3124
3125 static int vxlan_lowerdev_event(struct notifier_block *unused,
3126 unsigned long event, void *ptr)
3127 {
3128 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3129 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3130
3131 if (event == NETDEV_UNREGISTER)
3132 vxlan_handle_lowerdev_unregister(vn, dev);
3133
3134 return NOTIFY_DONE;
3135 }
3136
3137 static struct notifier_block vxlan_notifier_block __read_mostly = {
3138 .notifier_call = vxlan_lowerdev_event,
3139 };
3140
3141 static __net_init int vxlan_init_net(struct net *net)
3142 {
3143 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3144 unsigned int h;
3145
3146 INIT_LIST_HEAD(&vn->vxlan_list);
3147 spin_lock_init(&vn->sock_lock);
3148
3149 for (h = 0; h < PORT_HASH_SIZE; ++h)
3150 INIT_HLIST_HEAD(&vn->sock_list[h]);
3151
3152 return 0;
3153 }
3154
3155 static void __net_exit vxlan_exit_net(struct net *net)
3156 {
3157 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3158 struct vxlan_dev *vxlan, *next;
3159 struct net_device *dev, *aux;
3160 LIST_HEAD(list);
3161
3162 rtnl_lock();
3163 for_each_netdev_safe(net, dev, aux)
3164 if (dev->rtnl_link_ops == &vxlan_link_ops)
3165 unregister_netdevice_queue(dev, &list);
3166
3167 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3168 /* If vxlan->dev is in the same netns, it has already been added
3169 * to the list by the previous loop.
3170 */
3171 if (!net_eq(dev_net(vxlan->dev), net)) {
3172 gro_cells_destroy(&vxlan->gro_cells);
3173 unregister_netdevice_queue(vxlan->dev, &list);
3174 }
3175 }
3176
3177 unregister_netdevice_many(&list);
3178 rtnl_unlock();
3179 }
3180
3181 static struct pernet_operations vxlan_net_ops = {
3182 .init = vxlan_init_net,
3183 .exit = vxlan_exit_net,
3184 .id = &vxlan_net_id,
3185 .size = sizeof(struct vxlan_net),
3186 };
3187
3188 static int __init vxlan_init_module(void)
3189 {
3190 int rc;
3191
3192 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3193 if (!vxlan_wq)
3194 return -ENOMEM;
3195
3196 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3197
3198 rc = register_pernet_subsys(&vxlan_net_ops);
3199 if (rc)
3200 goto out1;
3201
3202 rc = register_netdevice_notifier(&vxlan_notifier_block);
3203 if (rc)
3204 goto out2;
3205
3206 rc = rtnl_link_register(&vxlan_link_ops);
3207 if (rc)
3208 goto out3;
3209
3210 return 0;
3211 out3:
3212 unregister_netdevice_notifier(&vxlan_notifier_block);
3213 out2:
3214 unregister_pernet_subsys(&vxlan_net_ops);
3215 out1:
3216 destroy_workqueue(vxlan_wq);
3217 return rc;
3218 }
3219 late_initcall(vxlan_init_module);
3220
3221 static void __exit vxlan_cleanup_module(void)
3222 {
3223 rtnl_link_unregister(&vxlan_link_ops);
3224 unregister_netdevice_notifier(&vxlan_notifier_block);
3225 destroy_workqueue(vxlan_wq);
3226 unregister_pernet_subsys(&vxlan_net_ops);
3227 /* rcu_barrier() is called by netns */
3228 }
3229 module_exit(vxlan_cleanup_module);
3230
3231 MODULE_LICENSE("GPL");
3232 MODULE_VERSION(VXLAN_VERSION);
3233 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3234 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3235 MODULE_ALIAS_RTNL_LINK("vxlan");
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