projects / deliverable / linux.git / blob
? search:


909f7931c297adb73e794c5e5d660f96d16dd11f
[deliverable/linux.git] / drivers / net / vxlan.c
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/rculist.h>
20 #include <linux/netdevice.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/udp.h>
24 #include <linux/igmp.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/hash.h>
29 #include <linux/ethtool.h>
30 #include <net/arp.h>
31 #include <net/ndisc.h>
32 #include <net/ip.h>
33 #include <net/ip_tunnels.h>
34 #include <net/icmp.h>
35 #include <net/udp.h>
36 #include <net/udp_tunnel.h>
37 #include <net/rtnetlink.h>
38 #include <net/route.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/vxlan.h>
44 #include <net/protocol.h>
45
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 + 2];
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, __be32 vni)
201 {
202 return &vs->vni_list[hash_32((__force u32)vni, 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, __be32 vni)
246 {
247 struct vxlan_dev *vxlan;
248
249 /* For flow based devices, map all packets to VNI 0 */
250 if (vs->flags & VXLAN_F_COLLECT_METADATA)
251 vni = 0;
252
253 hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
254 if (vxlan->default_dst.remote_vni == vni)
255 return vxlan;
256 }
257
258 return NULL;
259 }
260
261 /* Look up VNI in a per net namespace table */
262 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
263 sa_family_t family, __be16 port,
264 u32 flags)
265 {
266 struct vxlan_sock *vs;
267
268 vs = vxlan_find_sock(net, family, port, flags);
269 if (!vs)
270 return NULL;
271
272 return vxlan_vs_find_vni(vs, vni);
273 }
274
275 /* Fill in neighbour message in skbuff. */
276 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
277 const struct vxlan_fdb *fdb,
278 u32 portid, u32 seq, int type, unsigned int flags,
279 const struct vxlan_rdst *rdst)
280 {
281 unsigned long now = jiffies;
282 struct nda_cacheinfo ci;
283 struct nlmsghdr *nlh;
284 struct ndmsg *ndm;
285 bool send_ip, send_eth;
286
287 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
288 if (nlh == NULL)
289 return -EMSGSIZE;
290
291 ndm = nlmsg_data(nlh);
292 memset(ndm, 0, sizeof(*ndm));
293
294 send_eth = send_ip = true;
295
296 if (type == RTM_GETNEIGH) {
297 ndm->ndm_family = AF_INET;
298 send_ip = !vxlan_addr_any(&rdst->remote_ip);
299 send_eth = !is_zero_ether_addr(fdb->eth_addr);
300 } else
301 ndm->ndm_family = AF_BRIDGE;
302 ndm->ndm_state = fdb->state;
303 ndm->ndm_ifindex = vxlan->dev->ifindex;
304 ndm->ndm_flags = fdb->flags;
305 ndm->ndm_type = RTN_UNICAST;
306
307 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
308 nla_put_s32(skb, NDA_LINK_NETNSID,
309 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
310 goto nla_put_failure;
311
312 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
313 goto nla_put_failure;
314
315 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
316 goto nla_put_failure;
317
318 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
319 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
320 goto nla_put_failure;
321 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
322 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
323 goto nla_put_failure;
324 if (rdst->remote_ifindex &&
325 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
326 goto nla_put_failure;
327
328 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
329 ci.ndm_confirmed = 0;
330 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
331 ci.ndm_refcnt = 0;
332
333 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
334 goto nla_put_failure;
335
336 nlmsg_end(skb, nlh);
337 return 0;
338
339 nla_put_failure:
340 nlmsg_cancel(skb, nlh);
341 return -EMSGSIZE;
342 }
343
344 static inline size_t vxlan_nlmsg_size(void)
345 {
346 return NLMSG_ALIGN(sizeof(struct ndmsg))
347 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
348 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
349 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
350 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
351 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
352 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
353 + nla_total_size(sizeof(struct nda_cacheinfo));
354 }
355
356 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
357 struct vxlan_rdst *rd, int type)
358 {
359 struct net *net = dev_net(vxlan->dev);
360 struct sk_buff *skb;
361 int err = -ENOBUFS;
362
363 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
364 if (skb == NULL)
365 goto errout;
366
367 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
368 if (err < 0) {
369 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
370 WARN_ON(err == -EMSGSIZE);
371 kfree_skb(skb);
372 goto errout;
373 }
374
375 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
376 return;
377 errout:
378 if (err < 0)
379 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
380 }
381
382 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
383 {
384 struct vxlan_dev *vxlan = netdev_priv(dev);
385 struct vxlan_fdb f = {
386 .state = NUD_STALE,
387 };
388 struct vxlan_rdst remote = {
389 .remote_ip = *ipa, /* goes to NDA_DST */
390 .remote_vni = cpu_to_be32(VXLAN_N_VID),
391 };
392
393 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
394 }
395
396 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
397 {
398 struct vxlan_fdb f = {
399 .state = NUD_STALE,
400 };
401 struct vxlan_rdst remote = { };
402
403 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
404
405 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
406 }
407
408 /* Hash Ethernet address */
409 static u32 eth_hash(const unsigned char *addr)
410 {
411 u64 value = get_unaligned((u64 *)addr);
412
413 /* only want 6 bytes */
414 #ifdef __BIG_ENDIAN
415 value >>= 16;
416 #else
417 value <<= 16;
418 #endif
419 return hash_64(value, FDB_HASH_BITS);
420 }
421
422 /* Hash chain to use given mac address */
423 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
424 const u8 *mac)
425 {
426 return &vxlan->fdb_head[eth_hash(mac)];
427 }
428
429 /* Look up Ethernet address in forwarding table */
430 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
431 const u8 *mac)
432 {
433 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
434 struct vxlan_fdb *f;
435
436 hlist_for_each_entry_rcu(f, head, hlist) {
437 if (ether_addr_equal(mac, f->eth_addr))
438 return f;
439 }
440
441 return NULL;
442 }
443
444 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
445 const u8 *mac)
446 {
447 struct vxlan_fdb *f;
448
449 f = __vxlan_find_mac(vxlan, mac);
450 if (f)
451 f->used = jiffies;
452
453 return f;
454 }
455
456 /* caller should hold vxlan->hash_lock */
457 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
458 union vxlan_addr *ip, __be16 port,
459 __be32 vni, __u32 ifindex)
460 {
461 struct vxlan_rdst *rd;
462
463 list_for_each_entry(rd, &f->remotes, list) {
464 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
465 rd->remote_port == port &&
466 rd->remote_vni == vni &&
467 rd->remote_ifindex == ifindex)
468 return rd;
469 }
470
471 return NULL;
472 }
473
474 /* Replace destination of unicast mac */
475 static int vxlan_fdb_replace(struct vxlan_fdb *f,
476 union vxlan_addr *ip, __be16 port, __be32 vni,
477 __u32 ifindex)
478 {
479 struct vxlan_rdst *rd;
480
481 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
482 if (rd)
483 return 0;
484
485 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
486 if (!rd)
487 return 0;
488
489 dst_cache_reset(&rd->dst_cache);
490 rd->remote_ip = *ip;
491 rd->remote_port = port;
492 rd->remote_vni = vni;
493 rd->remote_ifindex = ifindex;
494 return 1;
495 }
496
497 /* Add/update destinations for multicast */
498 static int vxlan_fdb_append(struct vxlan_fdb *f,
499 union vxlan_addr *ip, __be16 port, __be32 vni,
500 __u32 ifindex, struct vxlan_rdst **rdp)
501 {
502 struct vxlan_rdst *rd;
503
504 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
505 if (rd)
506 return 0;
507
508 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
509 if (rd == NULL)
510 return -ENOBUFS;
511
512 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
513 kfree(rd);
514 return -ENOBUFS;
515 }
516
517 rd->remote_ip = *ip;
518 rd->remote_port = port;
519 rd->remote_vni = vni;
520 rd->remote_ifindex = ifindex;
521
522 list_add_tail_rcu(&rd->list, &f->remotes);
523
524 *rdp = rd;
525 return 1;
526 }
527
528 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
529 unsigned int off,
530 struct vxlanhdr *vh, size_t hdrlen,
531 __be32 vni_field,
532 struct gro_remcsum *grc,
533 bool nopartial)
534 {
535 size_t start, offset;
536
537 if (skb->remcsum_offload)
538 return vh;
539
540 if (!NAPI_GRO_CB(skb)->csum_valid)
541 return NULL;
542
543 start = vxlan_rco_start(vni_field);
544 offset = start + vxlan_rco_offset(vni_field);
545
546 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
547 start, offset, grc, nopartial);
548
549 skb->remcsum_offload = 1;
550
551 return vh;
552 }
553
554 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
555 struct sk_buff *skb,
556 struct udp_offload *uoff)
557 {
558 struct sk_buff *p, **pp = NULL;
559 struct vxlanhdr *vh, *vh2;
560 unsigned int hlen, off_vx;
561 int flush = 1;
562 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
563 udp_offloads);
564 __be32 flags;
565 struct gro_remcsum grc;
566
567 skb_gro_remcsum_init(&grc);
568
569 off_vx = skb_gro_offset(skb);
570 hlen = off_vx + sizeof(*vh);
571 vh = skb_gro_header_fast(skb, off_vx);
572 if (skb_gro_header_hard(skb, hlen)) {
573 vh = skb_gro_header_slow(skb, hlen, off_vx);
574 if (unlikely(!vh))
575 goto out;
576 }
577
578 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
579
580 flags = vh->vx_flags;
581
582 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
583 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
584 vh->vx_vni, &grc,
585 !!(vs->flags &
586 VXLAN_F_REMCSUM_NOPARTIAL));
587
588 if (!vh)
589 goto out;
590 }
591
592 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
593
594 flush = 0;
595
596 for (p = *head; p; p = p->next) {
597 if (!NAPI_GRO_CB(p)->same_flow)
598 continue;
599
600 vh2 = (struct vxlanhdr *)(p->data + off_vx);
601 if (vh->vx_flags != vh2->vx_flags ||
602 vh->vx_vni != vh2->vx_vni) {
603 NAPI_GRO_CB(p)->same_flow = 0;
604 continue;
605 }
606 }
607
608 pp = eth_gro_receive(head, skb);
609
610 out:
611 skb_gro_remcsum_cleanup(skb, &grc);
612 NAPI_GRO_CB(skb)->flush |= flush;
613
614 return pp;
615 }
616
617 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
618 struct udp_offload *uoff)
619 {
620 udp_tunnel_gro_complete(skb, nhoff);
621
622 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
623 }
624
625 /* Notify netdevs that UDP port started listening */
626 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
627 {
628 struct net_device *dev;
629 struct sock *sk = vs->sock->sk;
630 struct net *net = sock_net(sk);
631 sa_family_t sa_family = vxlan_get_sk_family(vs);
632 __be16 port = inet_sk(sk)->inet_sport;
633 int err;
634
635 if (sa_family == AF_INET) {
636 err = udp_add_offload(net, &vs->udp_offloads);
637 if (err)
638 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
639 }
640
641 rcu_read_lock();
642 for_each_netdev_rcu(net, dev) {
643 if (dev->netdev_ops->ndo_add_vxlan_port)
644 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
645 port);
646 }
647 rcu_read_unlock();
648 }
649
650 /* Notify netdevs that UDP port is no more listening */
651 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
652 {
653 struct net_device *dev;
654 struct sock *sk = vs->sock->sk;
655 struct net *net = sock_net(sk);
656 sa_family_t sa_family = vxlan_get_sk_family(vs);
657 __be16 port = inet_sk(sk)->inet_sport;
658
659 rcu_read_lock();
660 for_each_netdev_rcu(net, dev) {
661 if (dev->netdev_ops->ndo_del_vxlan_port)
662 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
663 port);
664 }
665 rcu_read_unlock();
666
667 if (sa_family == AF_INET)
668 udp_del_offload(&vs->udp_offloads);
669 }
670
671 /* Add new entry to forwarding table -- assumes lock held */
672 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
673 const u8 *mac, union vxlan_addr *ip,
674 __u16 state, __u16 flags,
675 __be16 port, __be32 vni, __u32 ifindex,
676 __u8 ndm_flags)
677 {
678 struct vxlan_rdst *rd = NULL;
679 struct vxlan_fdb *f;
680 int notify = 0;
681
682 f = __vxlan_find_mac(vxlan, mac);
683 if (f) {
684 if (flags & NLM_F_EXCL) {
685 netdev_dbg(vxlan->dev,
686 "lost race to create %pM\n", mac);
687 return -EEXIST;
688 }
689 if (f->state != state) {
690 f->state = state;
691 f->updated = jiffies;
692 notify = 1;
693 }
694 if (f->flags != ndm_flags) {
695 f->flags = ndm_flags;
696 f->updated = jiffies;
697 notify = 1;
698 }
699 if ((flags & NLM_F_REPLACE)) {
700 /* Only change unicasts */
701 if (!(is_multicast_ether_addr(f->eth_addr) ||
702 is_zero_ether_addr(f->eth_addr))) {
703 notify |= vxlan_fdb_replace(f, ip, port, vni,
704 ifindex);
705 } else
706 return -EOPNOTSUPP;
707 }
708 if ((flags & NLM_F_APPEND) &&
709 (is_multicast_ether_addr(f->eth_addr) ||
710 is_zero_ether_addr(f->eth_addr))) {
711 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
712 &rd);
713
714 if (rc < 0)
715 return rc;
716 notify |= rc;
717 }
718 } else {
719 if (!(flags & NLM_F_CREATE))
720 return -ENOENT;
721
722 if (vxlan->cfg.addrmax &&
723 vxlan->addrcnt >= vxlan->cfg.addrmax)
724 return -ENOSPC;
725
726 /* Disallow replace to add a multicast entry */
727 if ((flags & NLM_F_REPLACE) &&
728 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
729 return -EOPNOTSUPP;
730
731 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
732 f = kmalloc(sizeof(*f), GFP_ATOMIC);
733 if (!f)
734 return -ENOMEM;
735
736 notify = 1;
737 f->state = state;
738 f->flags = ndm_flags;
739 f->updated = f->used = jiffies;
740 INIT_LIST_HEAD(&f->remotes);
741 memcpy(f->eth_addr, mac, ETH_ALEN);
742
743 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
744
745 ++vxlan->addrcnt;
746 hlist_add_head_rcu(&f->hlist,
747 vxlan_fdb_head(vxlan, mac));
748 }
749
750 if (notify) {
751 if (rd == NULL)
752 rd = first_remote_rtnl(f);
753 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
754 }
755
756 return 0;
757 }
758
759 static void vxlan_fdb_free(struct rcu_head *head)
760 {
761 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
762 struct vxlan_rdst *rd, *nd;
763
764 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
765 dst_cache_destroy(&rd->dst_cache);
766 kfree(rd);
767 }
768 kfree(f);
769 }
770
771 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
772 {
773 netdev_dbg(vxlan->dev,
774 "delete %pM\n", f->eth_addr);
775
776 --vxlan->addrcnt;
777 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
778
779 hlist_del_rcu(&f->hlist);
780 call_rcu(&f->rcu, vxlan_fdb_free);
781 }
782
783 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
784 union vxlan_addr *ip, __be16 *port, __be32 *vni,
785 u32 *ifindex)
786 {
787 struct net *net = dev_net(vxlan->dev);
788 int err;
789
790 if (tb[NDA_DST]) {
791 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
792 if (err)
793 return err;
794 } else {
795 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
796 if (remote->sa.sa_family == AF_INET) {
797 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
798 ip->sa.sa_family = AF_INET;
799 #if IS_ENABLED(CONFIG_IPV6)
800 } else {
801 ip->sin6.sin6_addr = in6addr_any;
802 ip->sa.sa_family = AF_INET6;
803 #endif
804 }
805 }
806
807 if (tb[NDA_PORT]) {
808 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
809 return -EINVAL;
810 *port = nla_get_be16(tb[NDA_PORT]);
811 } else {
812 *port = vxlan->cfg.dst_port;
813 }
814
815 if (tb[NDA_VNI]) {
816 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
817 return -EINVAL;
818 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
819 } else {
820 *vni = vxlan->default_dst.remote_vni;
821 }
822
823 if (tb[NDA_IFINDEX]) {
824 struct net_device *tdev;
825
826 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
827 return -EINVAL;
828 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
829 tdev = __dev_get_by_index(net, *ifindex);
830 if (!tdev)
831 return -EADDRNOTAVAIL;
832 } else {
833 *ifindex = 0;
834 }
835
836 return 0;
837 }
838
839 /* Add static entry (via netlink) */
840 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
841 struct net_device *dev,
842 const unsigned char *addr, u16 vid, u16 flags)
843 {
844 struct vxlan_dev *vxlan = netdev_priv(dev);
845 /* struct net *net = dev_net(vxlan->dev); */
846 union vxlan_addr ip;
847 __be16 port;
848 __be32 vni;
849 u32 ifindex;
850 int err;
851
852 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
853 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
854 ndm->ndm_state);
855 return -EINVAL;
856 }
857
858 if (tb[NDA_DST] == NULL)
859 return -EINVAL;
860
861 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
862 if (err)
863 return err;
864
865 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
866 return -EAFNOSUPPORT;
867
868 spin_lock_bh(&vxlan->hash_lock);
869 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
870 port, vni, ifindex, ndm->ndm_flags);
871 spin_unlock_bh(&vxlan->hash_lock);
872
873 return err;
874 }
875
876 /* Delete entry (via netlink) */
877 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
878 struct net_device *dev,
879 const unsigned char *addr, u16 vid)
880 {
881 struct vxlan_dev *vxlan = netdev_priv(dev);
882 struct vxlan_fdb *f;
883 struct vxlan_rdst *rd = NULL;
884 union vxlan_addr ip;
885 __be16 port;
886 __be32 vni;
887 u32 ifindex;
888 int err;
889
890 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
891 if (err)
892 return err;
893
894 err = -ENOENT;
895
896 spin_lock_bh(&vxlan->hash_lock);
897 f = vxlan_find_mac(vxlan, addr);
898 if (!f)
899 goto out;
900
901 if (!vxlan_addr_any(&ip)) {
902 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
903 if (!rd)
904 goto out;
905 }
906
907 err = 0;
908
909 /* remove a destination if it's not the only one on the list,
910 * otherwise destroy the fdb entry
911 */
912 if (rd && !list_is_singular(&f->remotes)) {
913 list_del_rcu(&rd->list);
914 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
915 kfree_rcu(rd, rcu);
916 goto out;
917 }
918
919 vxlan_fdb_destroy(vxlan, f);
920
921 out:
922 spin_unlock_bh(&vxlan->hash_lock);
923
924 return err;
925 }
926
927 /* Dump forwarding table */
928 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
929 struct net_device *dev,
930 struct net_device *filter_dev, int idx)
931 {
932 struct vxlan_dev *vxlan = netdev_priv(dev);
933 unsigned int h;
934
935 for (h = 0; h < FDB_HASH_SIZE; ++h) {
936 struct vxlan_fdb *f;
937 int err;
938
939 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
940 struct vxlan_rdst *rd;
941
942 list_for_each_entry_rcu(rd, &f->remotes, list) {
943 if (idx < cb->args[0])
944 goto skip;
945
946 err = vxlan_fdb_info(skb, vxlan, f,
947 NETLINK_CB(cb->skb).portid,
948 cb->nlh->nlmsg_seq,
949 RTM_NEWNEIGH,
950 NLM_F_MULTI, rd);
951 if (err < 0)
952 goto out;
953 skip:
954 ++idx;
955 }
956 }
957 }
958 out:
959 return idx;
960 }
961
962 /* Watch incoming packets to learn mapping between Ethernet address
963 * and Tunnel endpoint.
964 * Return true if packet is bogus and should be dropped.
965 */
966 static bool vxlan_snoop(struct net_device *dev,
967 union vxlan_addr *src_ip, const u8 *src_mac)
968 {
969 struct vxlan_dev *vxlan = netdev_priv(dev);
970 struct vxlan_fdb *f;
971
972 f = vxlan_find_mac(vxlan, src_mac);
973 if (likely(f)) {
974 struct vxlan_rdst *rdst = first_remote_rcu(f);
975
976 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
977 return false;
978
979 /* Don't migrate static entries, drop packets */
980 if (f->state & NUD_NOARP)
981 return true;
982
983 if (net_ratelimit())
984 netdev_info(dev,
985 "%pM migrated from %pIS to %pIS\n",
986 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
987
988 rdst->remote_ip = *src_ip;
989 f->updated = jiffies;
990 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
991 } else {
992 /* learned new entry */
993 spin_lock(&vxlan->hash_lock);
994
995 /* close off race between vxlan_flush and incoming packets */
996 if (netif_running(dev))
997 vxlan_fdb_create(vxlan, src_mac, src_ip,
998 NUD_REACHABLE,
999 NLM_F_EXCL|NLM_F_CREATE,
1000 vxlan->cfg.dst_port,
1001 vxlan->default_dst.remote_vni,
1002 0, NTF_SELF);
1003 spin_unlock(&vxlan->hash_lock);
1004 }
1005
1006 return false;
1007 }
1008
1009 /* See if multicast group is already in use by other ID */
1010 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1011 {
1012 struct vxlan_dev *vxlan;
1013 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1014
1015 /* The vxlan_sock is only used by dev, leaving group has
1016 * no effect on other vxlan devices.
1017 */
1018 if (family == AF_INET && dev->vn4_sock &&
1019 atomic_read(&dev->vn4_sock->refcnt) == 1)
1020 return false;
1021 #if IS_ENABLED(CONFIG_IPV6)
1022 if (family == AF_INET6 && dev->vn6_sock &&
1023 atomic_read(&dev->vn6_sock->refcnt) == 1)
1024 return false;
1025 #endif
1026
1027 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1028 if (!netif_running(vxlan->dev) || vxlan == dev)
1029 continue;
1030
1031 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1032 continue;
1033 #if IS_ENABLED(CONFIG_IPV6)
1034 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1035 continue;
1036 #endif
1037
1038 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1039 &dev->default_dst.remote_ip))
1040 continue;
1041
1042 if (vxlan->default_dst.remote_ifindex !=
1043 dev->default_dst.remote_ifindex)
1044 continue;
1045
1046 return true;
1047 }
1048
1049 return false;
1050 }
1051
1052 static void __vxlan_sock_release(struct vxlan_sock *vs)
1053 {
1054 struct vxlan_net *vn;
1055
1056 if (!vs)
1057 return;
1058 if (!atomic_dec_and_test(&vs->refcnt))
1059 return;
1060
1061 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1062 spin_lock(&vn->sock_lock);
1063 hlist_del_rcu(&vs->hlist);
1064 vxlan_notify_del_rx_port(vs);
1065 spin_unlock(&vn->sock_lock);
1066
1067 queue_work(vxlan_wq, &vs->del_work);
1068 }
1069
1070 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1071 {
1072 __vxlan_sock_release(vxlan->vn4_sock);
1073 #if IS_ENABLED(CONFIG_IPV6)
1074 __vxlan_sock_release(vxlan->vn6_sock);
1075 #endif
1076 }
1077
1078 /* Update multicast group membership when first VNI on
1079 * multicast address is brought up
1080 */
1081 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1082 {
1083 struct sock *sk;
1084 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1085 int ifindex = vxlan->default_dst.remote_ifindex;
1086 int ret = -EINVAL;
1087
1088 if (ip->sa.sa_family == AF_INET) {
1089 struct ip_mreqn mreq = {
1090 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1091 .imr_ifindex = ifindex,
1092 };
1093
1094 sk = vxlan->vn4_sock->sock->sk;
1095 lock_sock(sk);
1096 ret = ip_mc_join_group(sk, &mreq);
1097 release_sock(sk);
1098 #if IS_ENABLED(CONFIG_IPV6)
1099 } else {
1100 sk = vxlan->vn6_sock->sock->sk;
1101 lock_sock(sk);
1102 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1103 &ip->sin6.sin6_addr);
1104 release_sock(sk);
1105 #endif
1106 }
1107
1108 return ret;
1109 }
1110
1111 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1112 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1113 {
1114 struct sock *sk;
1115 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1116 int ifindex = vxlan->default_dst.remote_ifindex;
1117 int ret = -EINVAL;
1118
1119 if (ip->sa.sa_family == AF_INET) {
1120 struct ip_mreqn mreq = {
1121 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1122 .imr_ifindex = ifindex,
1123 };
1124
1125 sk = vxlan->vn4_sock->sock->sk;
1126 lock_sock(sk);
1127 ret = ip_mc_leave_group(sk, &mreq);
1128 release_sock(sk);
1129 #if IS_ENABLED(CONFIG_IPV6)
1130 } else {
1131 sk = vxlan->vn6_sock->sock->sk;
1132 lock_sock(sk);
1133 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1134 &ip->sin6.sin6_addr);
1135 release_sock(sk);
1136 #endif
1137 }
1138
1139 return ret;
1140 }
1141
1142 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1143 struct sk_buff *skb, u32 vxflags)
1144 {
1145 size_t start, offset, plen;
1146
1147 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1148 goto out;
1149
1150 start = vxlan_rco_start(unparsed->vx_vni);
1151 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1152
1153 plen = sizeof(struct vxlanhdr) + offset + sizeof(u16);
1154
1155 if (!pskb_may_pull(skb, plen))
1156 return false;
1157
1158 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1159 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1160 out:
1161 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1162 unparsed->vx_vni &= VXLAN_VNI_MASK;
1163 return true;
1164 }
1165
1166 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1167 struct vxlan_metadata *md,
1168 struct metadata_dst *tun_dst)
1169 {
1170 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1171
1172 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1173 goto out;
1174
1175 md->gbp = ntohs(gbp->policy_id);
1176
1177 if (tun_dst)
1178 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1179
1180 if (gbp->dont_learn)
1181 md->gbp |= VXLAN_GBP_DONT_LEARN;
1182
1183 if (gbp->policy_applied)
1184 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1185
1186 out:
1187 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1188 }
1189
1190 static void vxlan_rcv(struct vxlan_dev *vxlan, struct vxlan_sock *vs,
1191 struct sk_buff *skb, struct vxlan_metadata *md,
1192 struct metadata_dst *tun_dst)
1193 {
1194 struct iphdr *oip = NULL;
1195 struct ipv6hdr *oip6 = NULL;
1196 struct pcpu_sw_netstats *stats;
1197 union vxlan_addr saddr;
1198 int err = 0;
1199
1200 skb_reset_mac_header(skb);
1201 skb->protocol = eth_type_trans(skb, vxlan->dev);
1202 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1203
1204 /* Ignore packet loops (and multicast echo) */
1205 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1206 goto drop;
1207
1208 /* Get data from the outer IP header */
1209 if (vxlan_get_sk_family(vs) == AF_INET) {
1210 oip = ip_hdr(skb);
1211 saddr.sin.sin_addr.s_addr = oip->saddr;
1212 saddr.sa.sa_family = AF_INET;
1213 #if IS_ENABLED(CONFIG_IPV6)
1214 } else {
1215 oip6 = ipv6_hdr(skb);
1216 saddr.sin6.sin6_addr = oip6->saddr;
1217 saddr.sa.sa_family = AF_INET6;
1218 #endif
1219 }
1220
1221 if (tun_dst) {
1222 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1223 tun_dst = NULL;
1224 }
1225
1226 if ((vxlan->flags & VXLAN_F_LEARN) &&
1227 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1228 goto drop;
1229
1230 skb_reset_network_header(skb);
1231 /* In flow-based mode, GBP is carried in dst_metadata */
1232 if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1233 skb->mark = md->gbp;
1234
1235 if (oip6)
1236 err = IP6_ECN_decapsulate(oip6, skb);
1237 if (oip)
1238 err = IP_ECN_decapsulate(oip, skb);
1239
1240 if (unlikely(err)) {
1241 if (log_ecn_error) {
1242 if (oip6)
1243 net_info_ratelimited("non-ECT from %pI6\n",
1244 &oip6->saddr);
1245 if (oip)
1246 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1247 &oip->saddr, oip->tos);
1248 }
1249 if (err > 1) {
1250 ++vxlan->dev->stats.rx_frame_errors;
1251 ++vxlan->dev->stats.rx_errors;
1252 goto drop;
1253 }
1254 }
1255
1256 stats = this_cpu_ptr(vxlan->dev->tstats);
1257 u64_stats_update_begin(&stats->syncp);
1258 stats->rx_packets++;
1259 stats->rx_bytes += skb->len;
1260 u64_stats_update_end(&stats->syncp);
1261
1262 gro_cells_receive(&vxlan->gro_cells, skb);
1263
1264 return;
1265 drop:
1266 if (tun_dst)
1267 dst_release((struct dst_entry *)tun_dst);
1268
1269 /* Consume bad packet */
1270 kfree_skb(skb);
1271 }
1272
1273 /* Callback from net/ipv4/udp.c to receive packets */
1274 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1275 {
1276 struct metadata_dst *tun_dst = NULL;
1277 struct vxlan_dev *vxlan;
1278 struct vxlan_sock *vs;
1279 struct vxlanhdr unparsed;
1280 struct vxlan_metadata _md;
1281 struct vxlan_metadata *md = &_md;
1282
1283 /* Need Vxlan and inner Ethernet header to be present */
1284 if (!pskb_may_pull(skb, VXLAN_HLEN))
1285 return 1;
1286
1287 unparsed = *vxlan_hdr(skb);
1288 /* VNI flag always required to be set */
1289 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1290 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1291 ntohl(vxlan_hdr(skb)->vx_flags),
1292 ntohl(vxlan_hdr(skb)->vx_vni));
1293 /* Return non vxlan pkt */
1294 return 1;
1295 }
1296 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1297 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1298
1299 vs = rcu_dereference_sk_user_data(sk);
1300 if (!vs)
1301 goto drop;
1302
1303 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1304 if (!vxlan)
1305 goto drop;
1306
1307 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB),
1308 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1309 goto drop;
1310
1311 if (vxlan_collect_metadata(vs)) {
1312 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1313
1314 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1315 vxlan_vni_to_tun_id(vni), sizeof(*md));
1316
1317 if (!tun_dst)
1318 goto drop;
1319
1320 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1321 } else {
1322 memset(md, 0, sizeof(*md));
1323 }
1324
1325 /* For backwards compatibility, only allow reserved fields to be
1326 * used by VXLAN extensions if explicitly requested.
1327 */
1328 if (vs->flags & VXLAN_F_REMCSUM_RX)
1329 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1330 goto drop;
1331 if (vs->flags & VXLAN_F_GBP)
1332 vxlan_parse_gbp_hdr(&unparsed, md, tun_dst);
1333
1334 if (unparsed.vx_flags || unparsed.vx_vni) {
1335 /* If there are any unprocessed flags remaining treat
1336 * this as a malformed packet. This behavior diverges from
1337 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1338 * in reserved fields are to be ignored. The approach here
1339 * maintains compatibility with previous stack code, and also
1340 * is more robust and provides a little more security in
1341 * adding extensions to VXLAN.
1342 */
1343 goto drop;
1344 }
1345
1346 vxlan_rcv(vxlan, vs, skb, md, tun_dst);
1347 return 0;
1348
1349 drop:
1350 if (tun_dst)
1351 dst_release((struct dst_entry *)tun_dst);
1352
1353 /* Consume bad packet */
1354 kfree_skb(skb);
1355 return 0;
1356 }
1357
1358 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1359 {
1360 struct vxlan_dev *vxlan = netdev_priv(dev);
1361 struct arphdr *parp;
1362 u8 *arpptr, *sha;
1363 __be32 sip, tip;
1364 struct neighbour *n;
1365
1366 if (dev->flags & IFF_NOARP)
1367 goto out;
1368
1369 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1370 dev->stats.tx_dropped++;
1371 goto out;
1372 }
1373 parp = arp_hdr(skb);
1374
1375 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1376 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1377 parp->ar_pro != htons(ETH_P_IP) ||
1378 parp->ar_op != htons(ARPOP_REQUEST) ||
1379 parp->ar_hln != dev->addr_len ||
1380 parp->ar_pln != 4)
1381 goto out;
1382 arpptr = (u8 *)parp + sizeof(struct arphdr);
1383 sha = arpptr;
1384 arpptr += dev->addr_len; /* sha */
1385 memcpy(&sip, arpptr, sizeof(sip));
1386 arpptr += sizeof(sip);
1387 arpptr += dev->addr_len; /* tha */
1388 memcpy(&tip, arpptr, sizeof(tip));
1389
1390 if (ipv4_is_loopback(tip) ||
1391 ipv4_is_multicast(tip))
1392 goto out;
1393
1394 n = neigh_lookup(&arp_tbl, &tip, dev);
1395
1396 if (n) {
1397 struct vxlan_fdb *f;
1398 struct sk_buff *reply;
1399
1400 if (!(n->nud_state & NUD_CONNECTED)) {
1401 neigh_release(n);
1402 goto out;
1403 }
1404
1405 f = vxlan_find_mac(vxlan, n->ha);
1406 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1407 /* bridge-local neighbor */
1408 neigh_release(n);
1409 goto out;
1410 }
1411
1412 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1413 n->ha, sha);
1414
1415 neigh_release(n);
1416
1417 if (reply == NULL)
1418 goto out;
1419
1420 skb_reset_mac_header(reply);
1421 __skb_pull(reply, skb_network_offset(reply));
1422 reply->ip_summed = CHECKSUM_UNNECESSARY;
1423 reply->pkt_type = PACKET_HOST;
1424
1425 if (netif_rx_ni(reply) == NET_RX_DROP)
1426 dev->stats.rx_dropped++;
1427 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1428 union vxlan_addr ipa = {
1429 .sin.sin_addr.s_addr = tip,
1430 .sin.sin_family = AF_INET,
1431 };
1432
1433 vxlan_ip_miss(dev, &ipa);
1434 }
1435 out:
1436 consume_skb(skb);
1437 return NETDEV_TX_OK;
1438 }
1439
1440 #if IS_ENABLED(CONFIG_IPV6)
1441 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1442 struct neighbour *n, bool isrouter)
1443 {
1444 struct net_device *dev = request->dev;
1445 struct sk_buff *reply;
1446 struct nd_msg *ns, *na;
1447 struct ipv6hdr *pip6;
1448 u8 *daddr;
1449 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1450 int ns_olen;
1451 int i, len;
1452
1453 if (dev == NULL)
1454 return NULL;
1455
1456 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1457 sizeof(*na) + na_olen + dev->needed_tailroom;
1458 reply = alloc_skb(len, GFP_ATOMIC);
1459 if (reply == NULL)
1460 return NULL;
1461
1462 reply->protocol = htons(ETH_P_IPV6);
1463 reply->dev = dev;
1464 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1465 skb_push(reply, sizeof(struct ethhdr));
1466 skb_set_mac_header(reply, 0);
1467
1468 ns = (struct nd_msg *)skb_transport_header(request);
1469
1470 daddr = eth_hdr(request)->h_source;
1471 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1472 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1473 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1474 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1475 break;
1476 }
1477 }
1478
1479 /* Ethernet header */
1480 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1481 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1482 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1483 reply->protocol = htons(ETH_P_IPV6);
1484
1485 skb_pull(reply, sizeof(struct ethhdr));
1486 skb_set_network_header(reply, 0);
1487 skb_put(reply, sizeof(struct ipv6hdr));
1488
1489 /* IPv6 header */
1490
1491 pip6 = ipv6_hdr(reply);
1492 memset(pip6, 0, sizeof(struct ipv6hdr));
1493 pip6->version = 6;
1494 pip6->priority = ipv6_hdr(request)->priority;
1495 pip6->nexthdr = IPPROTO_ICMPV6;
1496 pip6->hop_limit = 255;
1497 pip6->daddr = ipv6_hdr(request)->saddr;
1498 pip6->saddr = *(struct in6_addr *)n->primary_key;
1499
1500 skb_pull(reply, sizeof(struct ipv6hdr));
1501 skb_set_transport_header(reply, 0);
1502
1503 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1504
1505 /* Neighbor Advertisement */
1506 memset(na, 0, sizeof(*na)+na_olen);
1507 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1508 na->icmph.icmp6_router = isrouter;
1509 na->icmph.icmp6_override = 1;
1510 na->icmph.icmp6_solicited = 1;
1511 na->target = ns->target;
1512 ether_addr_copy(&na->opt[2], n->ha);
1513 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1514 na->opt[1] = na_olen >> 3;
1515
1516 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1517 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1518 csum_partial(na, sizeof(*na)+na_olen, 0));
1519
1520 pip6->payload_len = htons(sizeof(*na)+na_olen);
1521
1522 skb_push(reply, sizeof(struct ipv6hdr));
1523
1524 reply->ip_summed = CHECKSUM_UNNECESSARY;
1525
1526 return reply;
1527 }
1528
1529 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1530 {
1531 struct vxlan_dev *vxlan = netdev_priv(dev);
1532 struct nd_msg *msg;
1533 const struct ipv6hdr *iphdr;
1534 const struct in6_addr *saddr, *daddr;
1535 struct neighbour *n;
1536 struct inet6_dev *in6_dev;
1537
1538 in6_dev = __in6_dev_get(dev);
1539 if (!in6_dev)
1540 goto out;
1541
1542 iphdr = ipv6_hdr(skb);
1543 saddr = &iphdr->saddr;
1544 daddr = &iphdr->daddr;
1545
1546 msg = (struct nd_msg *)skb_transport_header(skb);
1547 if (msg->icmph.icmp6_code != 0 ||
1548 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1549 goto out;
1550
1551 if (ipv6_addr_loopback(daddr) ||
1552 ipv6_addr_is_multicast(&msg->target))
1553 goto out;
1554
1555 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1556
1557 if (n) {
1558 struct vxlan_fdb *f;
1559 struct sk_buff *reply;
1560
1561 if (!(n->nud_state & NUD_CONNECTED)) {
1562 neigh_release(n);
1563 goto out;
1564 }
1565
1566 f = vxlan_find_mac(vxlan, n->ha);
1567 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1568 /* bridge-local neighbor */
1569 neigh_release(n);
1570 goto out;
1571 }
1572
1573 reply = vxlan_na_create(skb, n,
1574 !!(f ? f->flags & NTF_ROUTER : 0));
1575
1576 neigh_release(n);
1577
1578 if (reply == NULL)
1579 goto out;
1580
1581 if (netif_rx_ni(reply) == NET_RX_DROP)
1582 dev->stats.rx_dropped++;
1583
1584 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1585 union vxlan_addr ipa = {
1586 .sin6.sin6_addr = msg->target,
1587 .sin6.sin6_family = AF_INET6,
1588 };
1589
1590 vxlan_ip_miss(dev, &ipa);
1591 }
1592
1593 out:
1594 consume_skb(skb);
1595 return NETDEV_TX_OK;
1596 }
1597 #endif
1598
1599 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1600 {
1601 struct vxlan_dev *vxlan = netdev_priv(dev);
1602 struct neighbour *n;
1603
1604 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1605 return false;
1606
1607 n = NULL;
1608 switch (ntohs(eth_hdr(skb)->h_proto)) {
1609 case ETH_P_IP:
1610 {
1611 struct iphdr *pip;
1612
1613 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1614 return false;
1615 pip = ip_hdr(skb);
1616 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1617 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1618 union vxlan_addr ipa = {
1619 .sin.sin_addr.s_addr = pip->daddr,
1620 .sin.sin_family = AF_INET,
1621 };
1622
1623 vxlan_ip_miss(dev, &ipa);
1624 return false;
1625 }
1626
1627 break;
1628 }
1629 #if IS_ENABLED(CONFIG_IPV6)
1630 case ETH_P_IPV6:
1631 {
1632 struct ipv6hdr *pip6;
1633
1634 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1635 return false;
1636 pip6 = ipv6_hdr(skb);
1637 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1638 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1639 union vxlan_addr ipa = {
1640 .sin6.sin6_addr = pip6->daddr,
1641 .sin6.sin6_family = AF_INET6,
1642 };
1643
1644 vxlan_ip_miss(dev, &ipa);
1645 return false;
1646 }
1647
1648 break;
1649 }
1650 #endif
1651 default:
1652 return false;
1653 }
1654
1655 if (n) {
1656 bool diff;
1657
1658 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1659 if (diff) {
1660 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1661 dev->addr_len);
1662 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1663 }
1664 neigh_release(n);
1665 return diff;
1666 }
1667
1668 return false;
1669 }
1670
1671 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1672 struct vxlan_metadata *md)
1673 {
1674 struct vxlanhdr_gbp *gbp;
1675
1676 if (!md->gbp)
1677 return;
1678
1679 gbp = (struct vxlanhdr_gbp *)vxh;
1680 vxh->vx_flags |= VXLAN_HF_GBP;
1681
1682 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1683 gbp->dont_learn = 1;
1684
1685 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1686 gbp->policy_applied = 1;
1687
1688 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1689 }
1690
1691 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1692 int iphdr_len, __be32 vni,
1693 struct vxlan_metadata *md, u32 vxflags,
1694 bool udp_sum)
1695 {
1696 struct vxlanhdr *vxh;
1697 int min_headroom;
1698 int err;
1699 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1700
1701 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1702 skb->ip_summed == CHECKSUM_PARTIAL) {
1703 int csum_start = skb_checksum_start_offset(skb);
1704
1705 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1706 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1707 (skb->csum_offset == offsetof(struct udphdr, check) ||
1708 skb->csum_offset == offsetof(struct tcphdr, check)))
1709 type |= SKB_GSO_TUNNEL_REMCSUM;
1710 }
1711
1712 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1713 + VXLAN_HLEN + iphdr_len
1714 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1715
1716 /* Need space for new headers (invalidates iph ptr) */
1717 err = skb_cow_head(skb, min_headroom);
1718 if (unlikely(err)) {
1719 kfree_skb(skb);
1720 return err;
1721 }
1722
1723 skb = vlan_hwaccel_push_inside(skb);
1724 if (WARN_ON(!skb))
1725 return -ENOMEM;
1726
1727 skb = iptunnel_handle_offloads(skb, type);
1728 if (IS_ERR(skb))
1729 return PTR_ERR(skb);
1730
1731 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1732 vxh->vx_flags = VXLAN_HF_VNI;
1733 vxh->vx_vni = vxlan_vni_field(vni);
1734
1735 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1736 unsigned int start;
1737
1738 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1739 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1740 vxh->vx_flags |= VXLAN_HF_RCO;
1741
1742 if (!skb_is_gso(skb)) {
1743 skb->ip_summed = CHECKSUM_NONE;
1744 skb->encapsulation = 0;
1745 }
1746 }
1747
1748 if (vxflags & VXLAN_F_GBP)
1749 vxlan_build_gbp_hdr(vxh, vxflags, md);
1750
1751 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1752 return 0;
1753 }
1754
1755 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1756 struct sk_buff *skb, int oif, u8 tos,
1757 __be32 daddr, __be32 *saddr,
1758 struct dst_cache *dst_cache,
1759 struct ip_tunnel_info *info)
1760 {
1761 struct rtable *rt = NULL;
1762 bool use_cache = false;
1763 struct flowi4 fl4;
1764
1765 /* when the ip_tunnel_info is availble, the tos used for lookup is
1766 * packet independent, so we can use the cache
1767 */
1768 if (!skb->mark && (!tos || info)) {
1769 use_cache = true;
1770 rt = dst_cache_get_ip4(dst_cache, saddr);
1771 if (rt)
1772 return rt;
1773 }
1774
1775 memset(&fl4, 0, sizeof(fl4));
1776 fl4.flowi4_oif = oif;
1777 fl4.flowi4_tos = RT_TOS(tos);
1778 fl4.flowi4_mark = skb->mark;
1779 fl4.flowi4_proto = IPPROTO_UDP;
1780 fl4.daddr = daddr;
1781 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1782
1783 rt = ip_route_output_key(vxlan->net, &fl4);
1784 if (!IS_ERR(rt)) {
1785 *saddr = fl4.saddr;
1786 if (use_cache)
1787 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1788 }
1789 return rt;
1790 }
1791
1792 #if IS_ENABLED(CONFIG_IPV6)
1793 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1794 struct sk_buff *skb, int oif,
1795 const struct in6_addr *daddr,
1796 struct in6_addr *saddr,
1797 struct dst_cache *dst_cache)
1798 {
1799 struct dst_entry *ndst;
1800 struct flowi6 fl6;
1801 int err;
1802
1803 if (!skb->mark) {
1804 ndst = dst_cache_get_ip6(dst_cache, saddr);
1805 if (ndst)
1806 return ndst;
1807 }
1808
1809 memset(&fl6, 0, sizeof(fl6));
1810 fl6.flowi6_oif = oif;
1811 fl6.daddr = *daddr;
1812 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1813 fl6.flowi6_mark = skb->mark;
1814 fl6.flowi6_proto = IPPROTO_UDP;
1815
1816 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1817 vxlan->vn6_sock->sock->sk,
1818 &ndst, &fl6);
1819 if (err < 0)
1820 return ERR_PTR(err);
1821
1822 *saddr = fl6.saddr;
1823 if (!skb->mark)
1824 dst_cache_set_ip6(dst_cache, ndst, saddr);
1825 return ndst;
1826 }
1827 #endif
1828
1829 /* Bypass encapsulation if the destination is local */
1830 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1831 struct vxlan_dev *dst_vxlan)
1832 {
1833 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1834 union vxlan_addr loopback;
1835 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1836 struct net_device *dev = skb->dev;
1837 int len = skb->len;
1838
1839 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1840 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1841 skb->pkt_type = PACKET_HOST;
1842 skb->encapsulation = 0;
1843 skb->dev = dst_vxlan->dev;
1844 __skb_pull(skb, skb_network_offset(skb));
1845
1846 if (remote_ip->sa.sa_family == AF_INET) {
1847 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1848 loopback.sa.sa_family = AF_INET;
1849 #if IS_ENABLED(CONFIG_IPV6)
1850 } else {
1851 loopback.sin6.sin6_addr = in6addr_loopback;
1852 loopback.sa.sa_family = AF_INET6;
1853 #endif
1854 }
1855
1856 if (dst_vxlan->flags & VXLAN_F_LEARN)
1857 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1858
1859 u64_stats_update_begin(&tx_stats->syncp);
1860 tx_stats->tx_packets++;
1861 tx_stats->tx_bytes += len;
1862 u64_stats_update_end(&tx_stats->syncp);
1863
1864 if (netif_rx(skb) == NET_RX_SUCCESS) {
1865 u64_stats_update_begin(&rx_stats->syncp);
1866 rx_stats->rx_packets++;
1867 rx_stats->rx_bytes += len;
1868 u64_stats_update_end(&rx_stats->syncp);
1869 } else {
1870 dev->stats.rx_dropped++;
1871 }
1872 }
1873
1874 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1875 struct vxlan_rdst *rdst, bool did_rsc)
1876 {
1877 struct dst_cache *dst_cache;
1878 struct ip_tunnel_info *info;
1879 struct vxlan_dev *vxlan = netdev_priv(dev);
1880 struct sock *sk;
1881 struct rtable *rt = NULL;
1882 const struct iphdr *old_iph;
1883 union vxlan_addr *dst;
1884 union vxlan_addr remote_ip;
1885 struct vxlan_metadata _md;
1886 struct vxlan_metadata *md = &_md;
1887 __be16 src_port = 0, dst_port;
1888 __be32 vni;
1889 __be16 df = 0;
1890 __u8 tos, ttl;
1891 int err;
1892 u32 flags = vxlan->flags;
1893 bool udp_sum = false;
1894 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1895
1896 info = skb_tunnel_info(skb);
1897
1898 if (rdst) {
1899 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1900 vni = rdst->remote_vni;
1901 dst = &rdst->remote_ip;
1902 dst_cache = &rdst->dst_cache;
1903 } else {
1904 if (!info) {
1905 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1906 dev->name);
1907 goto drop;
1908 }
1909 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1910 vni = vxlan_tun_id_to_vni(info->key.tun_id);
1911 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1912 if (remote_ip.sa.sa_family == AF_INET)
1913 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1914 else
1915 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1916 dst = &remote_ip;
1917 dst_cache = &info->dst_cache;
1918 }
1919
1920 if (vxlan_addr_any(dst)) {
1921 if (did_rsc) {
1922 /* short-circuited back to local bridge */
1923 vxlan_encap_bypass(skb, vxlan, vxlan);
1924 return;
1925 }
1926 goto drop;
1927 }
1928
1929 old_iph = ip_hdr(skb);
1930
1931 ttl = vxlan->cfg.ttl;
1932 if (!ttl && vxlan_addr_multicast(dst))
1933 ttl = 1;
1934
1935 tos = vxlan->cfg.tos;
1936 if (tos == 1)
1937 tos = ip_tunnel_get_dsfield(old_iph, skb);
1938
1939 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1940 vxlan->cfg.port_max, true);
1941
1942 if (info) {
1943 ttl = info->key.ttl;
1944 tos = info->key.tos;
1945 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
1946
1947 if (info->options_len)
1948 md = ip_tunnel_info_opts(info);
1949 } else {
1950 md->gbp = skb->mark;
1951 }
1952
1953 if (dst->sa.sa_family == AF_INET) {
1954 __be32 saddr;
1955
1956 if (!vxlan->vn4_sock)
1957 goto drop;
1958 sk = vxlan->vn4_sock->sock->sk;
1959
1960 rt = vxlan_get_route(vxlan, skb,
1961 rdst ? rdst->remote_ifindex : 0, tos,
1962 dst->sin.sin_addr.s_addr, &saddr,
1963 dst_cache, info);
1964 if (IS_ERR(rt)) {
1965 netdev_dbg(dev, "no route to %pI4\n",
1966 &dst->sin.sin_addr.s_addr);
1967 dev->stats.tx_carrier_errors++;
1968 goto tx_error;
1969 }
1970
1971 if (rt->dst.dev == dev) {
1972 netdev_dbg(dev, "circular route to %pI4\n",
1973 &dst->sin.sin_addr.s_addr);
1974 dev->stats.collisions++;
1975 goto rt_tx_error;
1976 }
1977
1978 /* Bypass encapsulation if the destination is local */
1979 if (rt->rt_flags & RTCF_LOCAL &&
1980 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1981 struct vxlan_dev *dst_vxlan;
1982
1983 ip_rt_put(rt);
1984 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1985 dst->sa.sa_family, dst_port,
1986 vxlan->flags);
1987 if (!dst_vxlan)
1988 goto tx_error;
1989 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1990 return;
1991 }
1992
1993 if (!info)
1994 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
1995 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
1996 df = htons(IP_DF);
1997
1998 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1999 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2000 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2001 vni, md, flags, udp_sum);
2002 if (err < 0)
2003 goto xmit_tx_error;
2004
2005 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2006 dst->sin.sin_addr.s_addr, tos, ttl, df,
2007 src_port, dst_port, xnet, !udp_sum);
2008 #if IS_ENABLED(CONFIG_IPV6)
2009 } else {
2010 struct dst_entry *ndst;
2011 struct in6_addr saddr;
2012 u32 rt6i_flags;
2013
2014 if (!vxlan->vn6_sock)
2015 goto drop;
2016 sk = vxlan->vn6_sock->sock->sk;
2017
2018 ndst = vxlan6_get_route(vxlan, skb,
2019 rdst ? rdst->remote_ifindex : 0,
2020 &dst->sin6.sin6_addr, &saddr,
2021 dst_cache);
2022 if (IS_ERR(ndst)) {
2023 netdev_dbg(dev, "no route to %pI6\n",
2024 &dst->sin6.sin6_addr);
2025 dev->stats.tx_carrier_errors++;
2026 goto tx_error;
2027 }
2028
2029 if (ndst->dev == dev) {
2030 netdev_dbg(dev, "circular route to %pI6\n",
2031 &dst->sin6.sin6_addr);
2032 dst_release(ndst);
2033 dev->stats.collisions++;
2034 goto tx_error;
2035 }
2036
2037 /* Bypass encapsulation if the destination is local */
2038 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2039 if (rt6i_flags & RTF_LOCAL &&
2040 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2041 struct vxlan_dev *dst_vxlan;
2042
2043 dst_release(ndst);
2044 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2045 dst->sa.sa_family, dst_port,
2046 vxlan->flags);
2047 if (!dst_vxlan)
2048 goto tx_error;
2049 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2050 return;
2051 }
2052
2053 if (!info)
2054 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2055
2056 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2057 skb_scrub_packet(skb, xnet);
2058 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2059 vni, md, flags, udp_sum);
2060 if (err < 0) {
2061 dst_release(ndst);
2062 return;
2063 }
2064 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2065 &saddr, &dst->sin6.sin6_addr,
2066 0, ttl, src_port, dst_port, !udp_sum);
2067 #endif
2068 }
2069
2070 return;
2071
2072 drop:
2073 dev->stats.tx_dropped++;
2074 goto tx_free;
2075
2076 xmit_tx_error:
2077 /* skb is already freed. */
2078 skb = NULL;
2079 rt_tx_error:
2080 ip_rt_put(rt);
2081 tx_error:
2082 dev->stats.tx_errors++;
2083 tx_free:
2084 dev_kfree_skb(skb);
2085 }
2086
2087 /* Transmit local packets over Vxlan
2088 *
2089 * Outer IP header inherits ECN and DF from inner header.
2090 * Outer UDP destination is the VXLAN assigned port.
2091 * source port is based on hash of flow
2092 */
2093 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2094 {
2095 struct vxlan_dev *vxlan = netdev_priv(dev);
2096 const struct ip_tunnel_info *info;
2097 struct ethhdr *eth;
2098 bool did_rsc = false;
2099 struct vxlan_rdst *rdst, *fdst = NULL;
2100 struct vxlan_fdb *f;
2101
2102 info = skb_tunnel_info(skb);
2103
2104 skb_reset_mac_header(skb);
2105 eth = eth_hdr(skb);
2106
2107 if ((vxlan->flags & VXLAN_F_PROXY)) {
2108 if (ntohs(eth->h_proto) == ETH_P_ARP)
2109 return arp_reduce(dev, skb);
2110 #if IS_ENABLED(CONFIG_IPV6)
2111 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2112 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2113 + sizeof(struct nd_msg)) &&
2114 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2115 struct nd_msg *msg;
2116
2117 msg = (struct nd_msg *)skb_transport_header(skb);
2118 if (msg->icmph.icmp6_code == 0 &&
2119 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2120 return neigh_reduce(dev, skb);
2121 }
2122 eth = eth_hdr(skb);
2123 #endif
2124 }
2125
2126 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2127 if (info && info->mode & IP_TUNNEL_INFO_TX)
2128 vxlan_xmit_one(skb, dev, NULL, false);
2129 else
2130 kfree_skb(skb);
2131 return NETDEV_TX_OK;
2132 }
2133
2134 f = vxlan_find_mac(vxlan, eth->h_dest);
2135 did_rsc = false;
2136
2137 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2138 (ntohs(eth->h_proto) == ETH_P_IP ||
2139 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2140 did_rsc = route_shortcircuit(dev, skb);
2141 if (did_rsc)
2142 f = vxlan_find_mac(vxlan, eth->h_dest);
2143 }
2144
2145 if (f == NULL) {
2146 f = vxlan_find_mac(vxlan, all_zeros_mac);
2147 if (f == NULL) {
2148 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2149 !is_multicast_ether_addr(eth->h_dest))
2150 vxlan_fdb_miss(vxlan, eth->h_dest);
2151
2152 dev->stats.tx_dropped++;
2153 kfree_skb(skb);
2154 return NETDEV_TX_OK;
2155 }
2156 }
2157
2158 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2159 struct sk_buff *skb1;
2160
2161 if (!fdst) {
2162 fdst = rdst;
2163 continue;
2164 }
2165 skb1 = skb_clone(skb, GFP_ATOMIC);
2166 if (skb1)
2167 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2168 }
2169
2170 if (fdst)
2171 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2172 else
2173 kfree_skb(skb);
2174 return NETDEV_TX_OK;
2175 }
2176
2177 /* Walk the forwarding table and purge stale entries */
2178 static void vxlan_cleanup(unsigned long arg)
2179 {
2180 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2181 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2182 unsigned int h;
2183
2184 if (!netif_running(vxlan->dev))
2185 return;
2186
2187 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2188 struct hlist_node *p, *n;
2189
2190 spin_lock_bh(&vxlan->hash_lock);
2191 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2192 struct vxlan_fdb *f
2193 = container_of(p, struct vxlan_fdb, hlist);
2194 unsigned long timeout;
2195
2196 if (f->state & NUD_PERMANENT)
2197 continue;
2198
2199 timeout = f->used + vxlan->cfg.age_interval * HZ;
2200 if (time_before_eq(timeout, jiffies)) {
2201 netdev_dbg(vxlan->dev,
2202 "garbage collect %pM\n",
2203 f->eth_addr);
2204 f->state = NUD_STALE;
2205 vxlan_fdb_destroy(vxlan, f);
2206 } else if (time_before(timeout, next_timer))
2207 next_timer = timeout;
2208 }
2209 spin_unlock_bh(&vxlan->hash_lock);
2210 }
2211
2212 mod_timer(&vxlan->age_timer, next_timer);
2213 }
2214
2215 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2216 {
2217 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2218 __be32 vni = vxlan->default_dst.remote_vni;
2219
2220 spin_lock(&vn->sock_lock);
2221 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2222 spin_unlock(&vn->sock_lock);
2223 }
2224
2225 /* Setup stats when device is created */
2226 static int vxlan_init(struct net_device *dev)
2227 {
2228 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2229 if (!dev->tstats)
2230 return -ENOMEM;
2231
2232 return 0;
2233 }
2234
2235 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2236 {
2237 struct vxlan_fdb *f;
2238
2239 spin_lock_bh(&vxlan->hash_lock);
2240 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2241 if (f)
2242 vxlan_fdb_destroy(vxlan, f);
2243 spin_unlock_bh(&vxlan->hash_lock);
2244 }
2245
2246 static void vxlan_uninit(struct net_device *dev)
2247 {
2248 struct vxlan_dev *vxlan = netdev_priv(dev);
2249
2250 vxlan_fdb_delete_default(vxlan);
2251
2252 free_percpu(dev->tstats);
2253 }
2254
2255 /* Start ageing timer and join group when device is brought up */
2256 static int vxlan_open(struct net_device *dev)
2257 {
2258 struct vxlan_dev *vxlan = netdev_priv(dev);
2259 int ret;
2260
2261 ret = vxlan_sock_add(vxlan);
2262 if (ret < 0)
2263 return ret;
2264
2265 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2266 ret = vxlan_igmp_join(vxlan);
2267 if (ret == -EADDRINUSE)
2268 ret = 0;
2269 if (ret) {
2270 vxlan_sock_release(vxlan);
2271 return ret;
2272 }
2273 }
2274
2275 if (vxlan->cfg.age_interval)
2276 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2277
2278 return ret;
2279 }
2280
2281 /* Purge the forwarding table */
2282 static void vxlan_flush(struct vxlan_dev *vxlan)
2283 {
2284 unsigned int h;
2285
2286 spin_lock_bh(&vxlan->hash_lock);
2287 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2288 struct hlist_node *p, *n;
2289 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2290 struct vxlan_fdb *f
2291 = container_of(p, struct vxlan_fdb, hlist);
2292 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2293 if (!is_zero_ether_addr(f->eth_addr))
2294 vxlan_fdb_destroy(vxlan, f);
2295 }
2296 }
2297 spin_unlock_bh(&vxlan->hash_lock);
2298 }
2299
2300 /* Cleanup timer and forwarding table on shutdown */
2301 static int vxlan_stop(struct net_device *dev)
2302 {
2303 struct vxlan_dev *vxlan = netdev_priv(dev);
2304 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2305 int ret = 0;
2306
2307 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2308 !vxlan_group_used(vn, vxlan))
2309 ret = vxlan_igmp_leave(vxlan);
2310
2311 del_timer_sync(&vxlan->age_timer);
2312
2313 vxlan_flush(vxlan);
2314 vxlan_sock_release(vxlan);
2315
2316 return ret;
2317 }
2318
2319 /* Stub, nothing needs to be done. */
2320 static void vxlan_set_multicast_list(struct net_device *dev)
2321 {
2322 }
2323
2324 static int __vxlan_change_mtu(struct net_device *dev,
2325 struct net_device *lowerdev,
2326 struct vxlan_rdst *dst, int new_mtu, bool strict)
2327 {
2328 int max_mtu = IP_MAX_MTU;
2329
2330 if (lowerdev)
2331 max_mtu = lowerdev->mtu;
2332
2333 if (dst->remote_ip.sa.sa_family == AF_INET6)
2334 max_mtu -= VXLAN6_HEADROOM;
2335 else
2336 max_mtu -= VXLAN_HEADROOM;
2337
2338 if (new_mtu < 68)
2339 return -EINVAL;
2340
2341 if (new_mtu > max_mtu) {
2342 if (strict)
2343 return -EINVAL;
2344
2345 new_mtu = max_mtu;
2346 }
2347
2348 dev->mtu = new_mtu;
2349 return 0;
2350 }
2351
2352 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2353 {
2354 struct vxlan_dev *vxlan = netdev_priv(dev);
2355 struct vxlan_rdst *dst = &vxlan->default_dst;
2356 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2357 dst->remote_ifindex);
2358 return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2359 }
2360
2361 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2362 {
2363 struct vxlan_dev *vxlan = netdev_priv(dev);
2364 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2365 __be16 sport, dport;
2366
2367 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2368 vxlan->cfg.port_max, true);
2369 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2370
2371 if (ip_tunnel_info_af(info) == AF_INET) {
2372 struct rtable *rt;
2373
2374 if (!vxlan->vn4_sock)
2375 return -EINVAL;
2376 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2377 info->key.u.ipv4.dst,
2378 &info->key.u.ipv4.src, NULL, info);
2379 if (IS_ERR(rt))
2380 return PTR_ERR(rt);
2381 ip_rt_put(rt);
2382 } else {
2383 #if IS_ENABLED(CONFIG_IPV6)
2384 struct dst_entry *ndst;
2385
2386 if (!vxlan->vn6_sock)
2387 return -EINVAL;
2388 ndst = vxlan6_get_route(vxlan, skb, 0,
2389 &info->key.u.ipv6.dst,
2390 &info->key.u.ipv6.src, NULL);
2391 if (IS_ERR(ndst))
2392 return PTR_ERR(ndst);
2393 dst_release(ndst);
2394 #else /* !CONFIG_IPV6 */
2395 return -EPFNOSUPPORT;
2396 #endif
2397 }
2398 info->key.tp_src = sport;
2399 info->key.tp_dst = dport;
2400 return 0;
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_TX_SKB_SHARING;
2476 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2477
2478 INIT_LIST_HEAD(&vxlan->next);
2479 spin_lock_init(&vxlan->hash_lock);
2480
2481 init_timer_deferrable(&vxlan->age_timer);
2482 vxlan->age_timer.function = vxlan_cleanup;
2483 vxlan->age_timer.data = (unsigned long) vxlan;
2484
2485 vxlan->cfg.dst_port = htons(vxlan_port);
2486
2487 vxlan->dev = dev;
2488
2489 gro_cells_init(&vxlan->gro_cells, dev);
2490
2491 for (h = 0; h < FDB_HASH_SIZE; ++h)
2492 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2493 }
2494
2495 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2496 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2497 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2498 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2499 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2500 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2501 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2502 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2503 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2504 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2505 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2506 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2507 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2508 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2509 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2510 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2511 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2512 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2513 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2514 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2515 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2516 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2517 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2518 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2519 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2520 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2521 };
2522
2523 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2524 {
2525 if (tb[IFLA_ADDRESS]) {
2526 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2527 pr_debug("invalid link address (not ethernet)\n");
2528 return -EINVAL;
2529 }
2530
2531 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2532 pr_debug("invalid all zero ethernet address\n");
2533 return -EADDRNOTAVAIL;
2534 }
2535 }
2536
2537 if (!data)
2538 return -EINVAL;
2539
2540 if (data[IFLA_VXLAN_ID]) {
2541 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2542 if (id >= VXLAN_VID_MASK)
2543 return -ERANGE;
2544 }
2545
2546 if (data[IFLA_VXLAN_PORT_RANGE]) {
2547 const struct ifla_vxlan_port_range *p
2548 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2549
2550 if (ntohs(p->high) < ntohs(p->low)) {
2551 pr_debug("port range %u .. %u not valid\n",
2552 ntohs(p->low), ntohs(p->high));
2553 return -EINVAL;
2554 }
2555 }
2556
2557 return 0;
2558 }
2559
2560 static void vxlan_get_drvinfo(struct net_device *netdev,
2561 struct ethtool_drvinfo *drvinfo)
2562 {
2563 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2564 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2565 }
2566
2567 static const struct ethtool_ops vxlan_ethtool_ops = {
2568 .get_drvinfo = vxlan_get_drvinfo,
2569 .get_link = ethtool_op_get_link,
2570 };
2571
2572 static void vxlan_del_work(struct work_struct *work)
2573 {
2574 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2575 udp_tunnel_sock_release(vs->sock);
2576 kfree_rcu(vs, rcu);
2577 }
2578
2579 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2580 __be16 port, u32 flags)
2581 {
2582 struct socket *sock;
2583 struct udp_port_cfg udp_conf;
2584 int err;
2585
2586 memset(&udp_conf, 0, sizeof(udp_conf));
2587
2588 if (ipv6) {
2589 udp_conf.family = AF_INET6;
2590 udp_conf.use_udp6_rx_checksums =
2591 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2592 udp_conf.ipv6_v6only = 1;
2593 } else {
2594 udp_conf.family = AF_INET;
2595 }
2596
2597 udp_conf.local_udp_port = port;
2598
2599 /* Open UDP socket */
2600 err = udp_sock_create(net, &udp_conf, &sock);
2601 if (err < 0)
2602 return ERR_PTR(err);
2603
2604 return sock;
2605 }
2606
2607 /* Create new listen socket if needed */
2608 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2609 __be16 port, u32 flags)
2610 {
2611 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2612 struct vxlan_sock *vs;
2613 struct socket *sock;
2614 unsigned int h;
2615 struct udp_tunnel_sock_cfg tunnel_cfg;
2616
2617 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2618 if (!vs)
2619 return ERR_PTR(-ENOMEM);
2620
2621 for (h = 0; h < VNI_HASH_SIZE; ++h)
2622 INIT_HLIST_HEAD(&vs->vni_list[h]);
2623
2624 INIT_WORK(&vs->del_work, vxlan_del_work);
2625
2626 sock = vxlan_create_sock(net, ipv6, port, flags);
2627 if (IS_ERR(sock)) {
2628 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2629 PTR_ERR(sock));
2630 kfree(vs);
2631 return ERR_CAST(sock);
2632 }
2633
2634 vs->sock = sock;
2635 atomic_set(&vs->refcnt, 1);
2636 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2637
2638 /* Initialize the vxlan udp offloads structure */
2639 vs->udp_offloads.port = port;
2640 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2641 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2642
2643 spin_lock(&vn->sock_lock);
2644 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2645 vxlan_notify_add_rx_port(vs);
2646 spin_unlock(&vn->sock_lock);
2647
2648 /* Mark socket as an encapsulation socket. */
2649 tunnel_cfg.sk_user_data = vs;
2650 tunnel_cfg.encap_type = 1;
2651 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2652 tunnel_cfg.encap_destroy = NULL;
2653
2654 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2655
2656 return vs;
2657 }
2658
2659 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2660 {
2661 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2662 struct vxlan_sock *vs = NULL;
2663
2664 if (!vxlan->cfg.no_share) {
2665 spin_lock(&vn->sock_lock);
2666 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2667 vxlan->cfg.dst_port, vxlan->flags);
2668 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2669 spin_unlock(&vn->sock_lock);
2670 return -EBUSY;
2671 }
2672 spin_unlock(&vn->sock_lock);
2673 }
2674 if (!vs)
2675 vs = vxlan_socket_create(vxlan->net, ipv6,
2676 vxlan->cfg.dst_port, vxlan->flags);
2677 if (IS_ERR(vs))
2678 return PTR_ERR(vs);
2679 #if IS_ENABLED(CONFIG_IPV6)
2680 if (ipv6)
2681 vxlan->vn6_sock = vs;
2682 else
2683 #endif
2684 vxlan->vn4_sock = vs;
2685 vxlan_vs_add_dev(vs, vxlan);
2686 return 0;
2687 }
2688
2689 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2690 {
2691 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2692 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2693 int ret = 0;
2694
2695 vxlan->vn4_sock = NULL;
2696 #if IS_ENABLED(CONFIG_IPV6)
2697 vxlan->vn6_sock = NULL;
2698 if (ipv6 || metadata)
2699 ret = __vxlan_sock_add(vxlan, true);
2700 #endif
2701 if (!ret && (!ipv6 || metadata))
2702 ret = __vxlan_sock_add(vxlan, false);
2703 if (ret < 0)
2704 vxlan_sock_release(vxlan);
2705 return ret;
2706 }
2707
2708 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2709 struct vxlan_config *conf)
2710 {
2711 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2712 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2713 struct vxlan_rdst *dst = &vxlan->default_dst;
2714 unsigned short needed_headroom = ETH_HLEN;
2715 int err;
2716 bool use_ipv6 = false;
2717 __be16 default_port = vxlan->cfg.dst_port;
2718 struct net_device *lowerdev = NULL;
2719
2720 vxlan->net = src_net;
2721
2722 dst->remote_vni = conf->vni;
2723
2724 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2725
2726 /* Unless IPv6 is explicitly requested, assume IPv4 */
2727 if (!dst->remote_ip.sa.sa_family)
2728 dst->remote_ip.sa.sa_family = AF_INET;
2729
2730 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2731 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2732 if (!IS_ENABLED(CONFIG_IPV6))
2733 return -EPFNOSUPPORT;
2734 use_ipv6 = true;
2735 vxlan->flags |= VXLAN_F_IPV6;
2736 }
2737
2738 if (conf->remote_ifindex) {
2739 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
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 (conf->mtu) {
2764 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2765 if (err)
2766 return err;
2767 }
2768
2769 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2770 needed_headroom += VXLAN6_HEADROOM;
2771 else
2772 needed_headroom += VXLAN_HEADROOM;
2773 dev->needed_headroom = needed_headroom;
2774
2775 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2776 if (!vxlan->cfg.dst_port)
2777 vxlan->cfg.dst_port = default_port;
2778 vxlan->flags |= conf->flags;
2779
2780 if (!vxlan->cfg.age_interval)
2781 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2782
2783 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2784 if (tmp->cfg.vni == conf->vni &&
2785 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2786 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2787 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2788 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2789 (vxlan->flags & VXLAN_F_RCV_FLAGS))
2790 return -EEXIST;
2791 }
2792
2793 dev->ethtool_ops = &vxlan_ethtool_ops;
2794
2795 /* create an fdb entry for a valid default destination */
2796 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2797 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2798 &vxlan->default_dst.remote_ip,
2799 NUD_REACHABLE|NUD_PERMANENT,
2800 NLM_F_EXCL|NLM_F_CREATE,
2801 vxlan->cfg.dst_port,
2802 vxlan->default_dst.remote_vni,
2803 vxlan->default_dst.remote_ifindex,
2804 NTF_SELF);
2805 if (err)
2806 return err;
2807 }
2808
2809 err = register_netdevice(dev);
2810 if (err) {
2811 vxlan_fdb_delete_default(vxlan);
2812 return err;
2813 }
2814
2815 list_add(&vxlan->next, &vn->vxlan_list);
2816
2817 return 0;
2818 }
2819
2820 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2821 u8 name_assign_type, struct vxlan_config *conf)
2822 {
2823 struct nlattr *tb[IFLA_MAX+1];
2824 struct net_device *dev;
2825 int err;
2826
2827 memset(&tb, 0, sizeof(tb));
2828
2829 dev = rtnl_create_link(net, name, name_assign_type,
2830 &vxlan_link_ops, tb);
2831 if (IS_ERR(dev))
2832 return dev;
2833
2834 err = vxlan_dev_configure(net, dev, conf);
2835 if (err < 0) {
2836 free_netdev(dev);
2837 return ERR_PTR(err);
2838 }
2839
2840 return dev;
2841 }
2842 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2843
2844 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2845 struct nlattr *tb[], struct nlattr *data[])
2846 {
2847 struct vxlan_config conf;
2848 int err;
2849
2850 memset(&conf, 0, sizeof(conf));
2851
2852 if (data[IFLA_VXLAN_ID])
2853 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2854
2855 if (data[IFLA_VXLAN_GROUP]) {
2856 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2857 } else if (data[IFLA_VXLAN_GROUP6]) {
2858 if (!IS_ENABLED(CONFIG_IPV6))
2859 return -EPFNOSUPPORT;
2860
2861 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2862 conf.remote_ip.sa.sa_family = AF_INET6;
2863 }
2864
2865 if (data[IFLA_VXLAN_LOCAL]) {
2866 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2867 conf.saddr.sa.sa_family = AF_INET;
2868 } else if (data[IFLA_VXLAN_LOCAL6]) {
2869 if (!IS_ENABLED(CONFIG_IPV6))
2870 return -EPFNOSUPPORT;
2871
2872 /* TODO: respect scope id */
2873 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2874 conf.saddr.sa.sa_family = AF_INET6;
2875 }
2876
2877 if (data[IFLA_VXLAN_LINK])
2878 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2879
2880 if (data[IFLA_VXLAN_TOS])
2881 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2882
2883 if (data[IFLA_VXLAN_TTL])
2884 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2885
2886 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2887 conf.flags |= VXLAN_F_LEARN;
2888
2889 if (data[IFLA_VXLAN_AGEING])
2890 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2891
2892 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2893 conf.flags |= VXLAN_F_PROXY;
2894
2895 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2896 conf.flags |= VXLAN_F_RSC;
2897
2898 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2899 conf.flags |= VXLAN_F_L2MISS;
2900
2901 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2902 conf.flags |= VXLAN_F_L3MISS;
2903
2904 if (data[IFLA_VXLAN_LIMIT])
2905 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2906
2907 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2908 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2909 conf.flags |= VXLAN_F_COLLECT_METADATA;
2910
2911 if (data[IFLA_VXLAN_PORT_RANGE]) {
2912 const struct ifla_vxlan_port_range *p
2913 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2914 conf.port_min = ntohs(p->low);
2915 conf.port_max = ntohs(p->high);
2916 }
2917
2918 if (data[IFLA_VXLAN_PORT])
2919 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2920
2921 if (data[IFLA_VXLAN_UDP_CSUM] &&
2922 !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2923 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
2924
2925 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2926 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2927 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2928
2929 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2930 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2931 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2932
2933 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2934 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2935 conf.flags |= VXLAN_F_REMCSUM_TX;
2936
2937 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2938 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2939 conf.flags |= VXLAN_F_REMCSUM_RX;
2940
2941 if (data[IFLA_VXLAN_GBP])
2942 conf.flags |= VXLAN_F_GBP;
2943
2944 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2945 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2946
2947 err = vxlan_dev_configure(src_net, dev, &conf);
2948 switch (err) {
2949 case -ENODEV:
2950 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2951 break;
2952
2953 case -EPERM:
2954 pr_info("IPv6 is disabled via sysctl\n");
2955 break;
2956
2957 case -EEXIST:
2958 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
2959 break;
2960 }
2961
2962 return err;
2963 }
2964
2965 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2966 {
2967 struct vxlan_dev *vxlan = netdev_priv(dev);
2968 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2969
2970 spin_lock(&vn->sock_lock);
2971 if (!hlist_unhashed(&vxlan->hlist))
2972 hlist_del_rcu(&vxlan->hlist);
2973 spin_unlock(&vn->sock_lock);
2974
2975 gro_cells_destroy(&vxlan->gro_cells);
2976 list_del(&vxlan->next);
2977 unregister_netdevice_queue(dev, head);
2978 }
2979
2980 static size_t vxlan_get_size(const struct net_device *dev)
2981 {
2982
2983 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2984 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2985 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2986 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2987 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2988 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2989 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2990 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2991 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2992 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2993 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2994 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
2995 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2996 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2997 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2998 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2999 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3000 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3001 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3002 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3003 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3004 0;
3005 }
3006
3007 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3008 {
3009 const struct vxlan_dev *vxlan = netdev_priv(dev);
3010 const struct vxlan_rdst *dst = &vxlan->default_dst;
3011 struct ifla_vxlan_port_range ports = {
3012 .low = htons(vxlan->cfg.port_min),
3013 .high = htons(vxlan->cfg.port_max),
3014 };
3015
3016 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3017 goto nla_put_failure;
3018
3019 if (!vxlan_addr_any(&dst->remote_ip)) {
3020 if (dst->remote_ip.sa.sa_family == AF_INET) {
3021 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3022 dst->remote_ip.sin.sin_addr.s_addr))
3023 goto nla_put_failure;
3024 #if IS_ENABLED(CONFIG_IPV6)
3025 } else {
3026 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3027 &dst->remote_ip.sin6.sin6_addr))
3028 goto nla_put_failure;
3029 #endif
3030 }
3031 }
3032
3033 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3034 goto nla_put_failure;
3035
3036 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3037 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3038 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3039 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3040 goto nla_put_failure;
3041 #if IS_ENABLED(CONFIG_IPV6)
3042 } else {
3043 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3044 &vxlan->cfg.saddr.sin6.sin6_addr))
3045 goto nla_put_failure;
3046 #endif
3047 }
3048 }
3049
3050 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3051 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3052 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3053 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3054 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3055 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3056 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3057 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3058 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3059 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3060 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3061 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3062 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3063 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3064 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3065 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3066 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3067 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3068 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3069 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3070 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3071 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3072 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3073 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3074 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3075 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3076 goto nla_put_failure;
3077
3078 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3079 goto nla_put_failure;
3080
3081 if (vxlan->flags & VXLAN_F_GBP &&
3082 nla_put_flag(skb, IFLA_VXLAN_GBP))
3083 goto nla_put_failure;
3084
3085 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3086 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3087 goto nla_put_failure;
3088
3089 return 0;
3090
3091 nla_put_failure:
3092 return -EMSGSIZE;
3093 }
3094
3095 static struct net *vxlan_get_link_net(const struct net_device *dev)
3096 {
3097 struct vxlan_dev *vxlan = netdev_priv(dev);
3098
3099 return vxlan->net;
3100 }
3101
3102 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3103 .kind = "vxlan",
3104 .maxtype = IFLA_VXLAN_MAX,
3105 .policy = vxlan_policy,
3106 .priv_size = sizeof(struct vxlan_dev),
3107 .setup = vxlan_setup,
3108 .validate = vxlan_validate,
3109 .newlink = vxlan_newlink,
3110 .dellink = vxlan_dellink,
3111 .get_size = vxlan_get_size,
3112 .fill_info = vxlan_fill_info,
3113 .get_link_net = vxlan_get_link_net,
3114 };
3115
3116 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3117 struct net_device *dev)
3118 {
3119 struct vxlan_dev *vxlan, *next;
3120 LIST_HEAD(list_kill);
3121
3122 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3123 struct vxlan_rdst *dst = &vxlan->default_dst;
3124
3125 /* In case we created vxlan device with carrier
3126 * and we loose the carrier due to module unload
3127 * we also need to remove vxlan device. In other
3128 * cases, it's not necessary and remote_ifindex
3129 * is 0 here, so no matches.
3130 */
3131 if (dst->remote_ifindex == dev->ifindex)
3132 vxlan_dellink(vxlan->dev, &list_kill);
3133 }
3134
3135 unregister_netdevice_many(&list_kill);
3136 }
3137
3138 static int vxlan_lowerdev_event(struct notifier_block *unused,
3139 unsigned long event, void *ptr)
3140 {
3141 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3142 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3143
3144 if (event == NETDEV_UNREGISTER)
3145 vxlan_handle_lowerdev_unregister(vn, dev);
3146
3147 return NOTIFY_DONE;
3148 }
3149
3150 static struct notifier_block vxlan_notifier_block __read_mostly = {
3151 .notifier_call = vxlan_lowerdev_event,
3152 };
3153
3154 static __net_init int vxlan_init_net(struct net *net)
3155 {
3156 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3157 unsigned int h;
3158
3159 INIT_LIST_HEAD(&vn->vxlan_list);
3160 spin_lock_init(&vn->sock_lock);
3161
3162 for (h = 0; h < PORT_HASH_SIZE; ++h)
3163 INIT_HLIST_HEAD(&vn->sock_list[h]);
3164
3165 return 0;
3166 }
3167
3168 static void __net_exit vxlan_exit_net(struct net *net)
3169 {
3170 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3171 struct vxlan_dev *vxlan, *next;
3172 struct net_device *dev, *aux;
3173 LIST_HEAD(list);
3174
3175 rtnl_lock();
3176 for_each_netdev_safe(net, dev, aux)
3177 if (dev->rtnl_link_ops == &vxlan_link_ops)
3178 unregister_netdevice_queue(dev, &list);
3179
3180 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3181 /* If vxlan->dev is in the same netns, it has already been added
3182 * to the list by the previous loop.
3183 */
3184 if (!net_eq(dev_net(vxlan->dev), net)) {
3185 gro_cells_destroy(&vxlan->gro_cells);
3186 unregister_netdevice_queue(vxlan->dev, &list);
3187 }
3188 }
3189
3190 unregister_netdevice_many(&list);
3191 rtnl_unlock();
3192 }
3193
3194 static struct pernet_operations vxlan_net_ops = {
3195 .init = vxlan_init_net,
3196 .exit = vxlan_exit_net,
3197 .id = &vxlan_net_id,
3198 .size = sizeof(struct vxlan_net),
3199 };
3200
3201 static int __init vxlan_init_module(void)
3202 {
3203 int rc;
3204
3205 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3206 if (!vxlan_wq)
3207 return -ENOMEM;
3208
3209 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3210
3211 rc = register_pernet_subsys(&vxlan_net_ops);
3212 if (rc)
3213 goto out1;
3214
3215 rc = register_netdevice_notifier(&vxlan_notifier_block);
3216 if (rc)
3217 goto out2;
3218
3219 rc = rtnl_link_register(&vxlan_link_ops);
3220 if (rc)
3221 goto out3;
3222
3223 return 0;
3224 out3:
3225 unregister_netdevice_notifier(&vxlan_notifier_block);
3226 out2:
3227 unregister_pernet_subsys(&vxlan_net_ops);
3228 out1:
3229 destroy_workqueue(vxlan_wq);
3230 return rc;
3231 }
3232 late_initcall(vxlan_init_module);
3233
3234 static void __exit vxlan_cleanup_module(void)
3235 {
3236 rtnl_link_unregister(&vxlan_link_ops);
3237 unregister_netdevice_notifier(&vxlan_notifier_block);
3238 destroy_workqueue(vxlan_wq);
3239 unregister_pernet_subsys(&vxlan_net_ops);
3240 /* rcu_barrier() is called by netns */
3241 }
3242 module_exit(vxlan_cleanup_module);
3243
3244 MODULE_LICENSE("GPL");
3245 MODULE_VERSION(VXLAN_VERSION);
3246 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3247 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3248 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux kernel - Deliverables
This page took 0.091433 seconds and 4 git commands to generate.