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ASoC: cs35l35: Add additional delay for reset
[linux-2.6/btrfs-unstable.git] / drivers / net / vxlan.c
blob328b4712683c334bf1de66a3a3789d0a04d734c3
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/module.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/udp.h>
18 #include <linux/igmp.h>
19 #include <linux/if_ether.h>
20 #include <linux/ethtool.h>
21 #include <net/arp.h>
22 #include <net/ndisc.h>
23 #include <net/ip.h>
24 #include <net/icmp.h>
25 #include <net/rtnetlink.h>
26 #include <net/inet_ecn.h>
27 #include <net/net_namespace.h>
28 #include <net/netns/generic.h>
29 #include <net/vxlan.h>
30
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <net/ip6_tunnel.h>
33 #include <net/ip6_checksum.h>
34 #endif
35
36 #define VXLAN_VERSION "0.1"
37
38 #define PORT_HASH_BITS 8
39 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
40 #define FDB_AGE_DEFAULT 300 /* 5 min */
41 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
42
43 /* UDP port for VXLAN traffic.
44 * The IANA assigned port is 4789, but the Linux default is 8472
45 * for compatibility with early adopters.
46 */
47 static unsigned short vxlan_port __read_mostly = 8472;
48 module_param_named(udp_port, vxlan_port, ushort, 0444);
49 MODULE_PARM_DESC(udp_port, "Destination UDP port");
50
51 static bool log_ecn_error = true;
52 module_param(log_ecn_error, bool, 0644);
53 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
54
55 static unsigned int vxlan_net_id;
56 static struct rtnl_link_ops vxlan_link_ops;
57
58 static const u8 all_zeros_mac[ETH_ALEN + 2];
59
60 static int vxlan_sock_add(struct vxlan_dev *vxlan);
61
62 /* per-network namespace private data for this module */
63 struct vxlan_net {
64 struct list_head vxlan_list;
65 struct hlist_head sock_list[PORT_HASH_SIZE];
66 spinlock_t sock_lock;
67 };
68
69 /* Forwarding table entry */
70 struct vxlan_fdb {
71 struct hlist_node hlist; /* linked list of entries */
72 struct rcu_head rcu;
73 unsigned long updated; /* jiffies */
74 unsigned long used;
75 struct list_head remotes;
76 u8 eth_addr[ETH_ALEN];
77 u16 state; /* see ndm_state */
78 __be32 vni;
79 u8 flags; /* see ndm_flags */
80 };
81
82 /* salt for hash table */
83 static u32 vxlan_salt __read_mostly;
84
85 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
86 {
87 return vs->flags & VXLAN_F_COLLECT_METADATA ||
88 ip_tunnel_collect_metadata();
89 }
90
91 #if IS_ENABLED(CONFIG_IPV6)
92 static inline
93 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
94 {
95 if (a->sa.sa_family != b->sa.sa_family)
96 return false;
97 if (a->sa.sa_family == AF_INET6)
98 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
99 else
100 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
101 }
102
103 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
104 {
105 if (ipa->sa.sa_family == AF_INET6)
106 return ipv6_addr_any(&ipa->sin6.sin6_addr);
107 else
108 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
109 }
110
111 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
112 {
113 if (ipa->sa.sa_family == AF_INET6)
114 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
115 else
116 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
117 }
118
119 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
120 {
121 if (nla_len(nla) >= sizeof(struct in6_addr)) {
122 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
123 ip->sa.sa_family = AF_INET6;
124 return 0;
125 } else if (nla_len(nla) >= sizeof(__be32)) {
126 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
127 ip->sa.sa_family = AF_INET;
128 return 0;
129 } else {
130 return -EAFNOSUPPORT;
131 }
132 }
133
134 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
135 const union vxlan_addr *ip)
136 {
137 if (ip->sa.sa_family == AF_INET6)
138 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
139 else
140 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
141 }
142
143 #else /* !CONFIG_IPV6 */
144
145 static inline
146 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
147 {
148 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
149 }
150
151 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
152 {
153 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
154 }
155
156 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
157 {
158 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
159 }
160
161 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
162 {
163 if (nla_len(nla) >= sizeof(struct in6_addr)) {
164 return -EAFNOSUPPORT;
165 } else if (nla_len(nla) >= sizeof(__be32)) {
166 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
167 ip->sa.sa_family = AF_INET;
168 return 0;
169 } else {
170 return -EAFNOSUPPORT;
171 }
172 }
173
174 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
175 const union vxlan_addr *ip)
176 {
177 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
178 }
179 #endif
180
181 /* Virtual Network hash table head */
182 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
183 {
184 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
185 }
186
187 /* Socket hash table head */
188 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
189 {
190 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
191
192 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
193 }
194
195 /* First remote destination for a forwarding entry.
196 * Guaranteed to be non-NULL because remotes are never deleted.
197 */
198 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
199 {
200 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
201 }
202
203 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
204 {
205 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
206 }
207
208 /* Find VXLAN socket based on network namespace, address family and UDP port
209 * and enabled unshareable flags.
210 */
211 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
212 __be16 port, u32 flags)
213 {
214 struct vxlan_sock *vs;
215
216 flags &= VXLAN_F_RCV_FLAGS;
217
218 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
219 if (inet_sk(vs->sock->sk)->inet_sport == port &&
220 vxlan_get_sk_family(vs) == family &&
221 vs->flags == flags)
222 return vs;
223 }
224 return NULL;
225 }
226
227 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
228 {
229 struct vxlan_dev *vxlan;
230
231 /* For flow based devices, map all packets to VNI 0 */
232 if (vs->flags & VXLAN_F_COLLECT_METADATA)
233 vni = 0;
234
235 hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
236 if (vxlan->default_dst.remote_vni == vni)
237 return vxlan;
238 }
239
240 return NULL;
241 }
242
243 /* Look up VNI in a per net namespace table */
244 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
245 sa_family_t family, __be16 port,
246 u32 flags)
247 {
248 struct vxlan_sock *vs;
249
250 vs = vxlan_find_sock(net, family, port, flags);
251 if (!vs)
252 return NULL;
253
254 return vxlan_vs_find_vni(vs, vni);
255 }
256
257 /* Fill in neighbour message in skbuff. */
258 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
259 const struct vxlan_fdb *fdb,
260 u32 portid, u32 seq, int type, unsigned int flags,
261 const struct vxlan_rdst *rdst)
262 {
263 unsigned long now = jiffies;
264 struct nda_cacheinfo ci;
265 struct nlmsghdr *nlh;
266 struct ndmsg *ndm;
267 bool send_ip, send_eth;
268
269 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
270 if (nlh == NULL)
271 return -EMSGSIZE;
272
273 ndm = nlmsg_data(nlh);
274 memset(ndm, 0, sizeof(*ndm));
275
276 send_eth = send_ip = true;
277
278 if (type == RTM_GETNEIGH) {
279 send_ip = !vxlan_addr_any(&rdst->remote_ip);
280 send_eth = !is_zero_ether_addr(fdb->eth_addr);
281 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
282 } else
283 ndm->ndm_family = AF_BRIDGE;
284 ndm->ndm_state = fdb->state;
285 ndm->ndm_ifindex = vxlan->dev->ifindex;
286 ndm->ndm_flags = fdb->flags;
287 ndm->ndm_type = RTN_UNICAST;
288
289 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
290 nla_put_s32(skb, NDA_LINK_NETNSID,
291 peernet2id(dev_net(vxlan->dev), vxlan->net)))
292 goto nla_put_failure;
293
294 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
295 goto nla_put_failure;
296
297 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
298 goto nla_put_failure;
299
300 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
301 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
302 goto nla_put_failure;
303 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
304 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
305 goto nla_put_failure;
306 if ((vxlan->flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
307 nla_put_u32(skb, NDA_SRC_VNI,
308 be32_to_cpu(fdb->vni)))
309 goto nla_put_failure;
310 if (rdst->remote_ifindex &&
311 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
312 goto nla_put_failure;
313
314 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
315 ci.ndm_confirmed = 0;
316 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
317 ci.ndm_refcnt = 0;
318
319 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
320 goto nla_put_failure;
321
322 nlmsg_end(skb, nlh);
323 return 0;
324
325 nla_put_failure:
326 nlmsg_cancel(skb, nlh);
327 return -EMSGSIZE;
328 }
329
330 static inline size_t vxlan_nlmsg_size(void)
331 {
332 return NLMSG_ALIGN(sizeof(struct ndmsg))
333 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
334 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
335 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
336 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
337 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
338 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
339 + nla_total_size(sizeof(struct nda_cacheinfo));
340 }
341
342 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
343 struct vxlan_rdst *rd, int type)
344 {
345 struct net *net = dev_net(vxlan->dev);
346 struct sk_buff *skb;
347 int err = -ENOBUFS;
348
349 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
350 if (skb == NULL)
351 goto errout;
352
353 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
354 if (err < 0) {
355 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
356 WARN_ON(err == -EMSGSIZE);
357 kfree_skb(skb);
358 goto errout;
359 }
360
361 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
362 return;
363 errout:
364 if (err < 0)
365 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
366 }
367
368 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
369 {
370 struct vxlan_dev *vxlan = netdev_priv(dev);
371 struct vxlan_fdb f = {
372 .state = NUD_STALE,
373 };
374 struct vxlan_rdst remote = {
375 .remote_ip = *ipa, /* goes to NDA_DST */
376 .remote_vni = cpu_to_be32(VXLAN_N_VID),
377 };
378
379 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
380 }
381
382 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
383 {
384 struct vxlan_fdb f = {
385 .state = NUD_STALE,
386 };
387 struct vxlan_rdst remote = { };
388
389 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
390
391 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
392 }
393
394 /* Hash Ethernet address */
395 static u32 eth_hash(const unsigned char *addr)
396 {
397 u64 value = get_unaligned((u64 *)addr);
398
399 /* only want 6 bytes */
400 #ifdef __BIG_ENDIAN
401 value >>= 16;
402 #else
403 value <<= 16;
404 #endif
405 return hash_64(value, FDB_HASH_BITS);
406 }
407
408 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
409 {
410 /* use 1 byte of OUI and 3 bytes of NIC */
411 u32 key = get_unaligned((u32 *)(addr + 2));
412
413 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
414 }
415
416 /* Hash chain to use given mac address */
417 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
418 const u8 *mac, __be32 vni)
419 {
420 if (vxlan->flags & VXLAN_F_COLLECT_METADATA)
421 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
422 else
423 return &vxlan->fdb_head[eth_hash(mac)];
424 }
425
426 /* Look up Ethernet address in forwarding table */
427 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
428 const u8 *mac, __be32 vni)
429 {
430 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
431 struct vxlan_fdb *f;
432
433 hlist_for_each_entry_rcu(f, head, hlist) {
434 if (ether_addr_equal(mac, f->eth_addr)) {
435 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
436 if (vni == f->vni)
437 return f;
438 } else {
439 return f;
440 }
441 }
442 }
443
444 return NULL;
445 }
446
447 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
448 const u8 *mac, __be32 vni)
449 {
450 struct vxlan_fdb *f;
451
452 f = __vxlan_find_mac(vxlan, mac, vni);
453 if (f)
454 f->used = jiffies;
455
456 return f;
457 }
458
459 /* caller should hold vxlan->hash_lock */
460 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
461 union vxlan_addr *ip, __be16 port,
462 __be32 vni, __u32 ifindex)
463 {
464 struct vxlan_rdst *rd;
465
466 list_for_each_entry(rd, &f->remotes, list) {
467 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
468 rd->remote_port == port &&
469 rd->remote_vni == vni &&
470 rd->remote_ifindex == ifindex)
471 return rd;
472 }
473
474 return NULL;
475 }
476
477 /* Replace destination of unicast mac */
478 static int vxlan_fdb_replace(struct vxlan_fdb *f,
479 union vxlan_addr *ip, __be16 port, __be32 vni,
480 __u32 ifindex)
481 {
482 struct vxlan_rdst *rd;
483
484 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
485 if (rd)
486 return 0;
487
488 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
489 if (!rd)
490 return 0;
491
492 dst_cache_reset(&rd->dst_cache);
493 rd->remote_ip = *ip;
494 rd->remote_port = port;
495 rd->remote_vni = vni;
496 rd->remote_ifindex = ifindex;
497 return 1;
498 }
499
500 /* Add/update destinations for multicast */
501 static int vxlan_fdb_append(struct vxlan_fdb *f,
502 union vxlan_addr *ip, __be16 port, __be32 vni,
503 __u32 ifindex, struct vxlan_rdst **rdp)
504 {
505 struct vxlan_rdst *rd;
506
507 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
508 if (rd)
509 return 0;
510
511 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
512 if (rd == NULL)
513 return -ENOBUFS;
514
515 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
516 kfree(rd);
517 return -ENOBUFS;
518 }
519
520 rd->remote_ip = *ip;
521 rd->remote_port = port;
522 rd->remote_vni = vni;
523 rd->remote_ifindex = ifindex;
524
525 list_add_tail_rcu(&rd->list, &f->remotes);
526
527 *rdp = rd;
528 return 1;
529 }
530
531 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
532 unsigned int off,
533 struct vxlanhdr *vh, size_t hdrlen,
534 __be32 vni_field,
535 struct gro_remcsum *grc,
536 bool nopartial)
537 {
538 size_t start, offset;
539
540 if (skb->remcsum_offload)
541 return vh;
542
543 if (!NAPI_GRO_CB(skb)->csum_valid)
544 return NULL;
545
546 start = vxlan_rco_start(vni_field);
547 offset = start + vxlan_rco_offset(vni_field);
548
549 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
550 start, offset, grc, nopartial);
551
552 skb->remcsum_offload = 1;
553
554 return vh;
555 }
556
557 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
558 struct sk_buff **head,
559 struct sk_buff *skb)
560 {
561 struct sk_buff *p, **pp = NULL;
562 struct vxlanhdr *vh, *vh2;
563 unsigned int hlen, off_vx;
564 int flush = 1;
565 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
566 __be32 flags;
567 struct gro_remcsum grc;
568
569 skb_gro_remcsum_init(&grc);
570
571 off_vx = skb_gro_offset(skb);
572 hlen = off_vx + sizeof(*vh);
573 vh = skb_gro_header_fast(skb, off_vx);
574 if (skb_gro_header_hard(skb, hlen)) {
575 vh = skb_gro_header_slow(skb, hlen, off_vx);
576 if (unlikely(!vh))
577 goto out;
578 }
579
580 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
581
582 flags = vh->vx_flags;
583
584 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
585 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
586 vh->vx_vni, &grc,
587 !!(vs->flags &
588 VXLAN_F_REMCSUM_NOPARTIAL));
589
590 if (!vh)
591 goto out;
592 }
593
594 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
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 = call_gro_receive(eth_gro_receive, head, skb);
609 flush = 0;
610
611 out:
612 skb_gro_remcsum_cleanup(skb, &grc);
613 NAPI_GRO_CB(skb)->flush |= flush;
614
615 return pp;
616 }
617
618 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
619 {
620 /* Sets 'skb->inner_mac_header' since we are always called with
621 * 'skb->encapsulation' set.
622 */
623 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
624 }
625
626 /* Add new entry to forwarding table -- assumes lock held */
627 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
628 const u8 *mac, union vxlan_addr *ip,
629 __u16 state, __u16 flags,
630 __be16 port, __be32 src_vni, __be32 vni,
631 __u32 ifindex, __u8 ndm_flags)
632 {
633 struct vxlan_rdst *rd = NULL;
634 struct vxlan_fdb *f;
635 int notify = 0;
636 int rc;
637
638 f = __vxlan_find_mac(vxlan, mac, src_vni);
639 if (f) {
640 if (flags & NLM_F_EXCL) {
641 netdev_dbg(vxlan->dev,
642 "lost race to create %pM\n", mac);
643 return -EEXIST;
644 }
645 if (f->state != state) {
646 f->state = state;
647 f->updated = jiffies;
648 notify = 1;
649 }
650 if (f->flags != ndm_flags) {
651 f->flags = ndm_flags;
652 f->updated = jiffies;
653 notify = 1;
654 }
655 if ((flags & NLM_F_REPLACE)) {
656 /* Only change unicasts */
657 if (!(is_multicast_ether_addr(f->eth_addr) ||
658 is_zero_ether_addr(f->eth_addr))) {
659 notify |= vxlan_fdb_replace(f, ip, port, vni,
660 ifindex);
661 } else
662 return -EOPNOTSUPP;
663 }
664 if ((flags & NLM_F_APPEND) &&
665 (is_multicast_ether_addr(f->eth_addr) ||
666 is_zero_ether_addr(f->eth_addr))) {
667 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
668
669 if (rc < 0)
670 return rc;
671 notify |= rc;
672 }
673 } else {
674 if (!(flags & NLM_F_CREATE))
675 return -ENOENT;
676
677 if (vxlan->cfg.addrmax &&
678 vxlan->addrcnt >= vxlan->cfg.addrmax)
679 return -ENOSPC;
680
681 /* Disallow replace to add a multicast entry */
682 if ((flags & NLM_F_REPLACE) &&
683 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
684 return -EOPNOTSUPP;
685
686 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
687 f = kmalloc(sizeof(*f), GFP_ATOMIC);
688 if (!f)
689 return -ENOMEM;
690
691 notify = 1;
692 f->state = state;
693 f->flags = ndm_flags;
694 f->updated = f->used = jiffies;
695 f->vni = src_vni;
696 INIT_LIST_HEAD(&f->remotes);
697 memcpy(f->eth_addr, mac, ETH_ALEN);
698
699 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
700 if (rc < 0) {
701 kfree(f);
702 return rc;
703 }
704
705 ++vxlan->addrcnt;
706 hlist_add_head_rcu(&f->hlist,
707 vxlan_fdb_head(vxlan, mac, src_vni));
708 }
709
710 if (notify) {
711 if (rd == NULL)
712 rd = first_remote_rtnl(f);
713 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
714 }
715
716 return 0;
717 }
718
719 static void vxlan_fdb_free(struct rcu_head *head)
720 {
721 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
722 struct vxlan_rdst *rd, *nd;
723
724 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
725 dst_cache_destroy(&rd->dst_cache);
726 kfree(rd);
727 }
728 kfree(f);
729 }
730
731 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
732 {
733 netdev_dbg(vxlan->dev,
734 "delete %pM\n", f->eth_addr);
735
736 --vxlan->addrcnt;
737 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
738
739 hlist_del_rcu(&f->hlist);
740 call_rcu(&f->rcu, vxlan_fdb_free);
741 }
742
743 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
744 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
745 __be32 *vni, u32 *ifindex)
746 {
747 struct net *net = dev_net(vxlan->dev);
748 int err;
749
750 if (tb[NDA_DST]) {
751 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
752 if (err)
753 return err;
754 } else {
755 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
756 if (remote->sa.sa_family == AF_INET) {
757 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
758 ip->sa.sa_family = AF_INET;
759 #if IS_ENABLED(CONFIG_IPV6)
760 } else {
761 ip->sin6.sin6_addr = in6addr_any;
762 ip->sa.sa_family = AF_INET6;
763 #endif
764 }
765 }
766
767 if (tb[NDA_PORT]) {
768 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
769 return -EINVAL;
770 *port = nla_get_be16(tb[NDA_PORT]);
771 } else {
772 *port = vxlan->cfg.dst_port;
773 }
774
775 if (tb[NDA_VNI]) {
776 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
777 return -EINVAL;
778 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
779 } else {
780 *vni = vxlan->default_dst.remote_vni;
781 }
782
783 if (tb[NDA_SRC_VNI]) {
784 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
785 return -EINVAL;
786 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
787 } else {
788 *src_vni = vxlan->default_dst.remote_vni;
789 }
790
791 if (tb[NDA_IFINDEX]) {
792 struct net_device *tdev;
793
794 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
795 return -EINVAL;
796 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
797 tdev = __dev_get_by_index(net, *ifindex);
798 if (!tdev)
799 return -EADDRNOTAVAIL;
800 } else {
801 *ifindex = 0;
802 }
803
804 return 0;
805 }
806
807 /* Add static entry (via netlink) */
808 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
809 struct net_device *dev,
810 const unsigned char *addr, u16 vid, u16 flags)
811 {
812 struct vxlan_dev *vxlan = netdev_priv(dev);
813 /* struct net *net = dev_net(vxlan->dev); */
814 union vxlan_addr ip;
815 __be16 port;
816 __be32 src_vni, vni;
817 u32 ifindex;
818 int err;
819
820 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
821 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
822 ndm->ndm_state);
823 return -EINVAL;
824 }
825
826 if (tb[NDA_DST] == NULL)
827 return -EINVAL;
828
829 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
830 if (err)
831 return err;
832
833 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
834 return -EAFNOSUPPORT;
835
836 spin_lock_bh(&vxlan->hash_lock);
837 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
838 port, src_vni, vni, ifindex, ndm->ndm_flags);
839 spin_unlock_bh(&vxlan->hash_lock);
840
841 return err;
842 }
843
844 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
845 const unsigned char *addr, union vxlan_addr ip,
846 __be16 port, __be32 src_vni, u32 vni, u32 ifindex,
847 u16 vid)
848 {
849 struct vxlan_fdb *f;
850 struct vxlan_rdst *rd = NULL;
851 int err = -ENOENT;
852
853 f = vxlan_find_mac(vxlan, addr, src_vni);
854 if (!f)
855 return err;
856
857 if (!vxlan_addr_any(&ip)) {
858 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
859 if (!rd)
860 goto out;
861 }
862
863 /* remove a destination if it's not the only one on the list,
864 * otherwise destroy the fdb entry
865 */
866 if (rd && !list_is_singular(&f->remotes)) {
867 list_del_rcu(&rd->list);
868 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
869 kfree_rcu(rd, rcu);
870 goto out;
871 }
872
873 vxlan_fdb_destroy(vxlan, f);
874
875 out:
876 return 0;
877 }
878
879 /* Delete entry (via netlink) */
880 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
881 struct net_device *dev,
882 const unsigned char *addr, u16 vid)
883 {
884 struct vxlan_dev *vxlan = netdev_priv(dev);
885 union vxlan_addr ip;
886 __be32 src_vni, vni;
887 __be16 port;
888 u32 ifindex;
889 int err;
890
891 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
892 if (err)
893 return err;
894
895 spin_lock_bh(&vxlan->hash_lock);
896 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
897 vid);
898 spin_unlock_bh(&vxlan->hash_lock);
899
900 return err;
901 }
902
903 /* Dump forwarding table */
904 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
905 struct net_device *dev,
906 struct net_device *filter_dev, int *idx)
907 {
908 struct vxlan_dev *vxlan = netdev_priv(dev);
909 unsigned int h;
910 int err = 0;
911
912 for (h = 0; h < FDB_HASH_SIZE; ++h) {
913 struct vxlan_fdb *f;
914
915 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
916 struct vxlan_rdst *rd;
917
918 list_for_each_entry_rcu(rd, &f->remotes, list) {
919 if (*idx < cb->args[2])
920 goto skip;
921
922 err = vxlan_fdb_info(skb, vxlan, f,
923 NETLINK_CB(cb->skb).portid,
924 cb->nlh->nlmsg_seq,
925 RTM_NEWNEIGH,
926 NLM_F_MULTI, rd);
927 if (err < 0)
928 goto out;
929 skip:
930 *idx += 1;
931 }
932 }
933 }
934 out:
935 return err;
936 }
937
938 /* Watch incoming packets to learn mapping between Ethernet address
939 * and Tunnel endpoint.
940 * Return true if packet is bogus and should be dropped.
941 */
942 static bool vxlan_snoop(struct net_device *dev,
943 union vxlan_addr *src_ip, const u8 *src_mac,
944 __be32 vni)
945 {
946 struct vxlan_dev *vxlan = netdev_priv(dev);
947 struct vxlan_fdb *f;
948
949 f = vxlan_find_mac(vxlan, src_mac, vni);
950 if (likely(f)) {
951 struct vxlan_rdst *rdst = first_remote_rcu(f);
952
953 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
954 return false;
955
956 /* Don't migrate static entries, drop packets */
957 if (f->state & NUD_NOARP)
958 return true;
959
960 if (net_ratelimit())
961 netdev_info(dev,
962 "%pM migrated from %pIS to %pIS\n",
963 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
964
965 rdst->remote_ip = *src_ip;
966 f->updated = jiffies;
967 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
968 } else {
969 /* learned new entry */
970 spin_lock(&vxlan->hash_lock);
971
972 /* close off race between vxlan_flush and incoming packets */
973 if (netif_running(dev))
974 vxlan_fdb_create(vxlan, src_mac, src_ip,
975 NUD_REACHABLE,
976 NLM_F_EXCL|NLM_F_CREATE,
977 vxlan->cfg.dst_port,
978 vni,
979 vxlan->default_dst.remote_vni,
980 0, NTF_SELF);
981 spin_unlock(&vxlan->hash_lock);
982 }
983
984 return false;
985 }
986
987 /* See if multicast group is already in use by other ID */
988 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
989 {
990 struct vxlan_dev *vxlan;
991 struct vxlan_sock *sock4;
992 #if IS_ENABLED(CONFIG_IPV6)
993 struct vxlan_sock *sock6;
994 #endif
995 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
996
997 sock4 = rtnl_dereference(dev->vn4_sock);
998
999 /* The vxlan_sock is only used by dev, leaving group has
1000 * no effect on other vxlan devices.
1001 */
1002 if (family == AF_INET && sock4 && atomic_read(&sock4->refcnt) == 1)
1003 return false;
1004 #if IS_ENABLED(CONFIG_IPV6)
1005 sock6 = rtnl_dereference(dev->vn6_sock);
1006 if (family == AF_INET6 && sock6 && atomic_read(&sock6->refcnt) == 1)
1007 return false;
1008 #endif
1009
1010 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1011 if (!netif_running(vxlan->dev) || vxlan == dev)
1012 continue;
1013
1014 if (family == AF_INET &&
1015 rtnl_dereference(vxlan->vn4_sock) != sock4)
1016 continue;
1017 #if IS_ENABLED(CONFIG_IPV6)
1018 if (family == AF_INET6 &&
1019 rtnl_dereference(vxlan->vn6_sock) != sock6)
1020 continue;
1021 #endif
1022
1023 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1024 &dev->default_dst.remote_ip))
1025 continue;
1026
1027 if (vxlan->default_dst.remote_ifindex !=
1028 dev->default_dst.remote_ifindex)
1029 continue;
1030
1031 return true;
1032 }
1033
1034 return false;
1035 }
1036
1037 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1038 {
1039 struct vxlan_net *vn;
1040
1041 if (!vs)
1042 return false;
1043 if (!atomic_dec_and_test(&vs->refcnt))
1044 return false;
1045
1046 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1047 spin_lock(&vn->sock_lock);
1048 hlist_del_rcu(&vs->hlist);
1049 udp_tunnel_notify_del_rx_port(vs->sock,
1050 (vs->flags & VXLAN_F_GPE) ?
1051 UDP_TUNNEL_TYPE_VXLAN_GPE :
1052 UDP_TUNNEL_TYPE_VXLAN);
1053 spin_unlock(&vn->sock_lock);
1054
1055 return true;
1056 }
1057
1058 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1059 {
1060 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1061 #if IS_ENABLED(CONFIG_IPV6)
1062 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1063
1064 rcu_assign_pointer(vxlan->vn6_sock, NULL);
1065 #endif
1066
1067 rcu_assign_pointer(vxlan->vn4_sock, NULL);
1068 synchronize_net();
1069
1070 if (__vxlan_sock_release_prep(sock4)) {
1071 udp_tunnel_sock_release(sock4->sock);
1072 kfree(sock4);
1073 }
1074
1075 #if IS_ENABLED(CONFIG_IPV6)
1076 if (__vxlan_sock_release_prep(sock6)) {
1077 udp_tunnel_sock_release(sock6->sock);
1078 kfree(sock6);
1079 }
1080 #endif
1081 }
1082
1083 /* Update multicast group membership when first VNI on
1084 * multicast address is brought up
1085 */
1086 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1087 {
1088 struct sock *sk;
1089 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1090 int ifindex = vxlan->default_dst.remote_ifindex;
1091 int ret = -EINVAL;
1092
1093 if (ip->sa.sa_family == AF_INET) {
1094 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1095 struct ip_mreqn mreq = {
1096 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1097 .imr_ifindex = ifindex,
1098 };
1099
1100 sk = sock4->sock->sk;
1101 lock_sock(sk);
1102 ret = ip_mc_join_group(sk, &mreq);
1103 release_sock(sk);
1104 #if IS_ENABLED(CONFIG_IPV6)
1105 } else {
1106 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1107
1108 sk = sock6->sock->sk;
1109 lock_sock(sk);
1110 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1111 &ip->sin6.sin6_addr);
1112 release_sock(sk);
1113 #endif
1114 }
1115
1116 return ret;
1117 }
1118
1119 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1120 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1121 {
1122 struct sock *sk;
1123 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1124 int ifindex = vxlan->default_dst.remote_ifindex;
1125 int ret = -EINVAL;
1126
1127 if (ip->sa.sa_family == AF_INET) {
1128 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1129 struct ip_mreqn mreq = {
1130 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1131 .imr_ifindex = ifindex,
1132 };
1133
1134 sk = sock4->sock->sk;
1135 lock_sock(sk);
1136 ret = ip_mc_leave_group(sk, &mreq);
1137 release_sock(sk);
1138 #if IS_ENABLED(CONFIG_IPV6)
1139 } else {
1140 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1141
1142 sk = sock6->sock->sk;
1143 lock_sock(sk);
1144 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1145 &ip->sin6.sin6_addr);
1146 release_sock(sk);
1147 #endif
1148 }
1149
1150 return ret;
1151 }
1152
1153 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1154 struct sk_buff *skb, u32 vxflags)
1155 {
1156 size_t start, offset;
1157
1158 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1159 goto out;
1160
1161 start = vxlan_rco_start(unparsed->vx_vni);
1162 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1163
1164 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1165 return false;
1166
1167 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1168 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1169 out:
1170 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1171 unparsed->vx_vni &= VXLAN_VNI_MASK;
1172 return true;
1173 }
1174
1175 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1176 struct sk_buff *skb, u32 vxflags,
1177 struct vxlan_metadata *md)
1178 {
1179 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1180 struct metadata_dst *tun_dst;
1181
1182 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1183 goto out;
1184
1185 md->gbp = ntohs(gbp->policy_id);
1186
1187 tun_dst = (struct metadata_dst *)skb_dst(skb);
1188 if (tun_dst) {
1189 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1190 tun_dst->u.tun_info.options_len = sizeof(*md);
1191 }
1192 if (gbp->dont_learn)
1193 md->gbp |= VXLAN_GBP_DONT_LEARN;
1194
1195 if (gbp->policy_applied)
1196 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1197
1198 /* In flow-based mode, GBP is carried in dst_metadata */
1199 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1200 skb->mark = md->gbp;
1201 out:
1202 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1203 }
1204
1205 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1206 __be16 *protocol,
1207 struct sk_buff *skb, u32 vxflags)
1208 {
1209 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1210
1211 /* Need to have Next Protocol set for interfaces in GPE mode. */
1212 if (!gpe->np_applied)
1213 return false;
1214 /* "The initial version is 0. If a receiver does not support the
1215 * version indicated it MUST drop the packet.
1216 */
1217 if (gpe->version != 0)
1218 return false;
1219 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1220 * processing MUST occur." However, we don't implement OAM
1221 * processing, thus drop the packet.
1222 */
1223 if (gpe->oam_flag)
1224 return false;
1225
1226 switch (gpe->next_protocol) {
1227 case VXLAN_GPE_NP_IPV4:
1228 *protocol = htons(ETH_P_IP);
1229 break;
1230 case VXLAN_GPE_NP_IPV6:
1231 *protocol = htons(ETH_P_IPV6);
1232 break;
1233 case VXLAN_GPE_NP_ETHERNET:
1234 *protocol = htons(ETH_P_TEB);
1235 break;
1236 default:
1237 return false;
1238 }
1239
1240 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1241 return true;
1242 }
1243
1244 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1245 struct vxlan_sock *vs,
1246 struct sk_buff *skb, __be32 vni)
1247 {
1248 union vxlan_addr saddr;
1249
1250 skb_reset_mac_header(skb);
1251 skb->protocol = eth_type_trans(skb, vxlan->dev);
1252 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1253
1254 /* Ignore packet loops (and multicast echo) */
1255 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1256 return false;
1257
1258 /* Get address from the outer IP header */
1259 if (vxlan_get_sk_family(vs) == AF_INET) {
1260 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1261 saddr.sa.sa_family = AF_INET;
1262 #if IS_ENABLED(CONFIG_IPV6)
1263 } else {
1264 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1265 saddr.sa.sa_family = AF_INET6;
1266 #endif
1267 }
1268
1269 if ((vxlan->flags & VXLAN_F_LEARN) &&
1270 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, vni))
1271 return false;
1272
1273 return true;
1274 }
1275
1276 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1277 struct sk_buff *skb)
1278 {
1279 int err = 0;
1280
1281 if (vxlan_get_sk_family(vs) == AF_INET)
1282 err = IP_ECN_decapsulate(oiph, skb);
1283 #if IS_ENABLED(CONFIG_IPV6)
1284 else
1285 err = IP6_ECN_decapsulate(oiph, skb);
1286 #endif
1287
1288 if (unlikely(err) && log_ecn_error) {
1289 if (vxlan_get_sk_family(vs) == AF_INET)
1290 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1291 &((struct iphdr *)oiph)->saddr,
1292 ((struct iphdr *)oiph)->tos);
1293 else
1294 net_info_ratelimited("non-ECT from %pI6\n",
1295 &((struct ipv6hdr *)oiph)->saddr);
1296 }
1297 return err <= 1;
1298 }
1299
1300 /* Callback from net/ipv4/udp.c to receive packets */
1301 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1302 {
1303 struct pcpu_sw_netstats *stats;
1304 struct vxlan_dev *vxlan;
1305 struct vxlan_sock *vs;
1306 struct vxlanhdr unparsed;
1307 struct vxlan_metadata _md;
1308 struct vxlan_metadata *md = &_md;
1309 __be16 protocol = htons(ETH_P_TEB);
1310 bool raw_proto = false;
1311 void *oiph;
1312 __be32 vni = 0;
1313
1314 /* Need UDP and VXLAN header to be present */
1315 if (!pskb_may_pull(skb, VXLAN_HLEN))
1316 goto drop;
1317
1318 unparsed = *vxlan_hdr(skb);
1319 /* VNI flag always required to be set */
1320 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1321 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1322 ntohl(vxlan_hdr(skb)->vx_flags),
1323 ntohl(vxlan_hdr(skb)->vx_vni));
1324 /* Return non vxlan pkt */
1325 goto drop;
1326 }
1327 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1328 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1329
1330 vs = rcu_dereference_sk_user_data(sk);
1331 if (!vs)
1332 goto drop;
1333
1334 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1335
1336 vxlan = vxlan_vs_find_vni(vs, vni);
1337 if (!vxlan)
1338 goto drop;
1339
1340 /* For backwards compatibility, only allow reserved fields to be
1341 * used by VXLAN extensions if explicitly requested.
1342 */
1343 if (vs->flags & VXLAN_F_GPE) {
1344 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1345 goto drop;
1346 raw_proto = true;
1347 }
1348
1349 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1350 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1351 goto drop;
1352
1353 if (vxlan_collect_metadata(vs)) {
1354 struct metadata_dst *tun_dst;
1355
1356 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1357 key32_to_tunnel_id(vni), sizeof(*md));
1358
1359 if (!tun_dst)
1360 goto drop;
1361
1362 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1363
1364 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1365 } else {
1366 memset(md, 0, sizeof(*md));
1367 }
1368
1369 if (vs->flags & VXLAN_F_REMCSUM_RX)
1370 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1371 goto drop;
1372 if (vs->flags & VXLAN_F_GBP)
1373 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1374 /* Note that GBP and GPE can never be active together. This is
1375 * ensured in vxlan_dev_configure.
1376 */
1377
1378 if (unparsed.vx_flags || unparsed.vx_vni) {
1379 /* If there are any unprocessed flags remaining treat
1380 * this as a malformed packet. This behavior diverges from
1381 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1382 * in reserved fields are to be ignored. The approach here
1383 * maintains compatibility with previous stack code, and also
1384 * is more robust and provides a little more security in
1385 * adding extensions to VXLAN.
1386 */
1387 goto drop;
1388 }
1389
1390 if (!raw_proto) {
1391 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1392 goto drop;
1393 } else {
1394 skb_reset_mac_header(skb);
1395 skb->dev = vxlan->dev;
1396 skb->pkt_type = PACKET_HOST;
1397 }
1398
1399 oiph = skb_network_header(skb);
1400 skb_reset_network_header(skb);
1401
1402 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1403 ++vxlan->dev->stats.rx_frame_errors;
1404 ++vxlan->dev->stats.rx_errors;
1405 goto drop;
1406 }
1407
1408 stats = this_cpu_ptr(vxlan->dev->tstats);
1409 u64_stats_update_begin(&stats->syncp);
1410 stats->rx_packets++;
1411 stats->rx_bytes += skb->len;
1412 u64_stats_update_end(&stats->syncp);
1413
1414 gro_cells_receive(&vxlan->gro_cells, skb);
1415 return 0;
1416
1417 drop:
1418 /* Consume bad packet */
1419 kfree_skb(skb);
1420 return 0;
1421 }
1422
1423 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1424 {
1425 struct vxlan_dev *vxlan = netdev_priv(dev);
1426 struct arphdr *parp;
1427 u8 *arpptr, *sha;
1428 __be32 sip, tip;
1429 struct neighbour *n;
1430
1431 if (dev->flags & IFF_NOARP)
1432 goto out;
1433
1434 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1435 dev->stats.tx_dropped++;
1436 goto out;
1437 }
1438 parp = arp_hdr(skb);
1439
1440 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1441 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1442 parp->ar_pro != htons(ETH_P_IP) ||
1443 parp->ar_op != htons(ARPOP_REQUEST) ||
1444 parp->ar_hln != dev->addr_len ||
1445 parp->ar_pln != 4)
1446 goto out;
1447 arpptr = (u8 *)parp + sizeof(struct arphdr);
1448 sha = arpptr;
1449 arpptr += dev->addr_len; /* sha */
1450 memcpy(&sip, arpptr, sizeof(sip));
1451 arpptr += sizeof(sip);
1452 arpptr += dev->addr_len; /* tha */
1453 memcpy(&tip, arpptr, sizeof(tip));
1454
1455 if (ipv4_is_loopback(tip) ||
1456 ipv4_is_multicast(tip))
1457 goto out;
1458
1459 n = neigh_lookup(&arp_tbl, &tip, dev);
1460
1461 if (n) {
1462 struct vxlan_fdb *f;
1463 struct sk_buff *reply;
1464
1465 if (!(n->nud_state & NUD_CONNECTED)) {
1466 neigh_release(n);
1467 goto out;
1468 }
1469
1470 f = vxlan_find_mac(vxlan, n->ha, vni);
1471 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1472 /* bridge-local neighbor */
1473 neigh_release(n);
1474 goto out;
1475 }
1476
1477 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1478 n->ha, sha);
1479
1480 neigh_release(n);
1481
1482 if (reply == NULL)
1483 goto out;
1484
1485 skb_reset_mac_header(reply);
1486 __skb_pull(reply, skb_network_offset(reply));
1487 reply->ip_summed = CHECKSUM_UNNECESSARY;
1488 reply->pkt_type = PACKET_HOST;
1489
1490 if (netif_rx_ni(reply) == NET_RX_DROP)
1491 dev->stats.rx_dropped++;
1492 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1493 union vxlan_addr ipa = {
1494 .sin.sin_addr.s_addr = tip,
1495 .sin.sin_family = AF_INET,
1496 };
1497
1498 vxlan_ip_miss(dev, &ipa);
1499 }
1500 out:
1501 consume_skb(skb);
1502 return NETDEV_TX_OK;
1503 }
1504
1505 #if IS_ENABLED(CONFIG_IPV6)
1506 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1507 struct neighbour *n, bool isrouter)
1508 {
1509 struct net_device *dev = request->dev;
1510 struct sk_buff *reply;
1511 struct nd_msg *ns, *na;
1512 struct ipv6hdr *pip6;
1513 u8 *daddr;
1514 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1515 int ns_olen;
1516 int i, len;
1517
1518 if (dev == NULL || !pskb_may_pull(request, request->len))
1519 return NULL;
1520
1521 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1522 sizeof(*na) + na_olen + dev->needed_tailroom;
1523 reply = alloc_skb(len, GFP_ATOMIC);
1524 if (reply == NULL)
1525 return NULL;
1526
1527 reply->protocol = htons(ETH_P_IPV6);
1528 reply->dev = dev;
1529 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1530 skb_push(reply, sizeof(struct ethhdr));
1531 skb_reset_mac_header(reply);
1532
1533 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1534
1535 daddr = eth_hdr(request)->h_source;
1536 ns_olen = request->len - skb_network_offset(request) -
1537 sizeof(struct ipv6hdr) - sizeof(*ns);
1538 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1539 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1540 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1541 break;
1542 }
1543 }
1544
1545 /* Ethernet header */
1546 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1547 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1548 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1549 reply->protocol = htons(ETH_P_IPV6);
1550
1551 skb_pull(reply, sizeof(struct ethhdr));
1552 skb_reset_network_header(reply);
1553 skb_put(reply, sizeof(struct ipv6hdr));
1554
1555 /* IPv6 header */
1556
1557 pip6 = ipv6_hdr(reply);
1558 memset(pip6, 0, sizeof(struct ipv6hdr));
1559 pip6->version = 6;
1560 pip6->priority = ipv6_hdr(request)->priority;
1561 pip6->nexthdr = IPPROTO_ICMPV6;
1562 pip6->hop_limit = 255;
1563 pip6->daddr = ipv6_hdr(request)->saddr;
1564 pip6->saddr = *(struct in6_addr *)n->primary_key;
1565
1566 skb_pull(reply, sizeof(struct ipv6hdr));
1567 skb_reset_transport_header(reply);
1568
1569 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1570
1571 /* Neighbor Advertisement */
1572 memset(na, 0, sizeof(*na)+na_olen);
1573 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1574 na->icmph.icmp6_router = isrouter;
1575 na->icmph.icmp6_override = 1;
1576 na->icmph.icmp6_solicited = 1;
1577 na->target = ns->target;
1578 ether_addr_copy(&na->opt[2], n->ha);
1579 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1580 na->opt[1] = na_olen >> 3;
1581
1582 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1583 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1584 csum_partial(na, sizeof(*na)+na_olen, 0));
1585
1586 pip6->payload_len = htons(sizeof(*na)+na_olen);
1587
1588 skb_push(reply, sizeof(struct ipv6hdr));
1589
1590 reply->ip_summed = CHECKSUM_UNNECESSARY;
1591
1592 return reply;
1593 }
1594
1595 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1596 {
1597 struct vxlan_dev *vxlan = netdev_priv(dev);
1598 struct nd_msg *msg;
1599 const struct ipv6hdr *iphdr;
1600 const struct in6_addr *daddr;
1601 struct neighbour *n;
1602 struct inet6_dev *in6_dev;
1603
1604 in6_dev = __in6_dev_get(dev);
1605 if (!in6_dev)
1606 goto out;
1607
1608 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + sizeof(struct nd_msg)))
1609 goto out;
1610
1611 iphdr = ipv6_hdr(skb);
1612 daddr = &iphdr->daddr;
1613
1614 msg = (struct nd_msg *)(iphdr + 1);
1615 if (msg->icmph.icmp6_code != 0 ||
1616 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1617 goto out;
1618
1619 if (ipv6_addr_loopback(daddr) ||
1620 ipv6_addr_is_multicast(&msg->target))
1621 goto out;
1622
1623 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1624
1625 if (n) {
1626 struct vxlan_fdb *f;
1627 struct sk_buff *reply;
1628
1629 if (!(n->nud_state & NUD_CONNECTED)) {
1630 neigh_release(n);
1631 goto out;
1632 }
1633
1634 f = vxlan_find_mac(vxlan, n->ha, vni);
1635 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1636 /* bridge-local neighbor */
1637 neigh_release(n);
1638 goto out;
1639 }
1640
1641 reply = vxlan_na_create(skb, n,
1642 !!(f ? f->flags & NTF_ROUTER : 0));
1643
1644 neigh_release(n);
1645
1646 if (reply == NULL)
1647 goto out;
1648
1649 if (netif_rx_ni(reply) == NET_RX_DROP)
1650 dev->stats.rx_dropped++;
1651
1652 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1653 union vxlan_addr ipa = {
1654 .sin6.sin6_addr = msg->target,
1655 .sin6.sin6_family = AF_INET6,
1656 };
1657
1658 vxlan_ip_miss(dev, &ipa);
1659 }
1660
1661 out:
1662 consume_skb(skb);
1663 return NETDEV_TX_OK;
1664 }
1665 #endif
1666
1667 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1668 {
1669 struct vxlan_dev *vxlan = netdev_priv(dev);
1670 struct neighbour *n;
1671
1672 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1673 return false;
1674
1675 n = NULL;
1676 switch (ntohs(eth_hdr(skb)->h_proto)) {
1677 case ETH_P_IP:
1678 {
1679 struct iphdr *pip;
1680
1681 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1682 return false;
1683 pip = ip_hdr(skb);
1684 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1685 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1686 union vxlan_addr ipa = {
1687 .sin.sin_addr.s_addr = pip->daddr,
1688 .sin.sin_family = AF_INET,
1689 };
1690
1691 vxlan_ip_miss(dev, &ipa);
1692 return false;
1693 }
1694
1695 break;
1696 }
1697 #if IS_ENABLED(CONFIG_IPV6)
1698 case ETH_P_IPV6:
1699 {
1700 struct ipv6hdr *pip6;
1701
1702 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1703 return false;
1704 pip6 = ipv6_hdr(skb);
1705 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1706 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1707 union vxlan_addr ipa = {
1708 .sin6.sin6_addr = pip6->daddr,
1709 .sin6.sin6_family = AF_INET6,
1710 };
1711
1712 vxlan_ip_miss(dev, &ipa);
1713 return false;
1714 }
1715
1716 break;
1717 }
1718 #endif
1719 default:
1720 return false;
1721 }
1722
1723 if (n) {
1724 bool diff;
1725
1726 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1727 if (diff) {
1728 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1729 dev->addr_len);
1730 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1731 }
1732 neigh_release(n);
1733 return diff;
1734 }
1735
1736 return false;
1737 }
1738
1739 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1740 struct vxlan_metadata *md)
1741 {
1742 struct vxlanhdr_gbp *gbp;
1743
1744 if (!md->gbp)
1745 return;
1746
1747 gbp = (struct vxlanhdr_gbp *)vxh;
1748 vxh->vx_flags |= VXLAN_HF_GBP;
1749
1750 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1751 gbp->dont_learn = 1;
1752
1753 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1754 gbp->policy_applied = 1;
1755
1756 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1757 }
1758
1759 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1760 __be16 protocol)
1761 {
1762 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1763
1764 gpe->np_applied = 1;
1765
1766 switch (protocol) {
1767 case htons(ETH_P_IP):
1768 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1769 return 0;
1770 case htons(ETH_P_IPV6):
1771 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1772 return 0;
1773 case htons(ETH_P_TEB):
1774 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1775 return 0;
1776 }
1777 return -EPFNOSUPPORT;
1778 }
1779
1780 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1781 int iphdr_len, __be32 vni,
1782 struct vxlan_metadata *md, u32 vxflags,
1783 bool udp_sum)
1784 {
1785 struct vxlanhdr *vxh;
1786 int min_headroom;
1787 int err;
1788 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1789 __be16 inner_protocol = htons(ETH_P_TEB);
1790
1791 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1792 skb->ip_summed == CHECKSUM_PARTIAL) {
1793 int csum_start = skb_checksum_start_offset(skb);
1794
1795 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1796 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1797 (skb->csum_offset == offsetof(struct udphdr, check) ||
1798 skb->csum_offset == offsetof(struct tcphdr, check)))
1799 type |= SKB_GSO_TUNNEL_REMCSUM;
1800 }
1801
1802 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1803 + VXLAN_HLEN + iphdr_len;
1804
1805 /* Need space for new headers (invalidates iph ptr) */
1806 err = skb_cow_head(skb, min_headroom);
1807 if (unlikely(err))
1808 return err;
1809
1810 err = iptunnel_handle_offloads(skb, type);
1811 if (err)
1812 return err;
1813
1814 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1815 vxh->vx_flags = VXLAN_HF_VNI;
1816 vxh->vx_vni = vxlan_vni_field(vni);
1817
1818 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1819 unsigned int start;
1820
1821 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1822 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1823 vxh->vx_flags |= VXLAN_HF_RCO;
1824
1825 if (!skb_is_gso(skb)) {
1826 skb->ip_summed = CHECKSUM_NONE;
1827 skb->encapsulation = 0;
1828 }
1829 }
1830
1831 if (vxflags & VXLAN_F_GBP)
1832 vxlan_build_gbp_hdr(vxh, vxflags, md);
1833 if (vxflags & VXLAN_F_GPE) {
1834 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1835 if (err < 0)
1836 return err;
1837 inner_protocol = skb->protocol;
1838 }
1839
1840 skb_set_inner_protocol(skb, inner_protocol);
1841 return 0;
1842 }
1843
1844 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1845 struct vxlan_sock *sock4,
1846 struct sk_buff *skb, int oif, u8 tos,
1847 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1848 struct dst_cache *dst_cache,
1849 const struct ip_tunnel_info *info)
1850 {
1851 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1852 struct rtable *rt = NULL;
1853 struct flowi4 fl4;
1854
1855 if (!sock4)
1856 return ERR_PTR(-EIO);
1857
1858 if (tos && !info)
1859 use_cache = false;
1860 if (use_cache) {
1861 rt = dst_cache_get_ip4(dst_cache, saddr);
1862 if (rt)
1863 return rt;
1864 }
1865
1866 memset(&fl4, 0, sizeof(fl4));
1867 fl4.flowi4_oif = oif;
1868 fl4.flowi4_tos = RT_TOS(tos);
1869 fl4.flowi4_mark = skb->mark;
1870 fl4.flowi4_proto = IPPROTO_UDP;
1871 fl4.daddr = daddr;
1872 fl4.saddr = *saddr;
1873 fl4.fl4_dport = dport;
1874 fl4.fl4_sport = sport;
1875
1876 rt = ip_route_output_key(vxlan->net, &fl4);
1877 if (likely(!IS_ERR(rt))) {
1878 if (rt->dst.dev == dev) {
1879 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1880 ip_rt_put(rt);
1881 return ERR_PTR(-ELOOP);
1882 }
1883
1884 *saddr = fl4.saddr;
1885 if (use_cache)
1886 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1887 } else {
1888 netdev_dbg(dev, "no route to %pI4\n", &daddr);
1889 return ERR_PTR(-ENETUNREACH);
1890 }
1891 return rt;
1892 }
1893
1894 #if IS_ENABLED(CONFIG_IPV6)
1895 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1896 struct net_device *dev,
1897 struct vxlan_sock *sock6,
1898 struct sk_buff *skb, int oif, u8 tos,
1899 __be32 label,
1900 const struct in6_addr *daddr,
1901 struct in6_addr *saddr,
1902 __be16 dport, __be16 sport,
1903 struct dst_cache *dst_cache,
1904 const struct ip_tunnel_info *info)
1905 {
1906 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1907 struct dst_entry *ndst;
1908 struct flowi6 fl6;
1909 int err;
1910
1911 if (!sock6)
1912 return ERR_PTR(-EIO);
1913
1914 if (tos && !info)
1915 use_cache = false;
1916 if (use_cache) {
1917 ndst = dst_cache_get_ip6(dst_cache, saddr);
1918 if (ndst)
1919 return ndst;
1920 }
1921
1922 memset(&fl6, 0, sizeof(fl6));
1923 fl6.flowi6_oif = oif;
1924 fl6.daddr = *daddr;
1925 fl6.saddr = *saddr;
1926 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1927 fl6.flowi6_mark = skb->mark;
1928 fl6.flowi6_proto = IPPROTO_UDP;
1929 fl6.fl6_dport = dport;
1930 fl6.fl6_sport = sport;
1931
1932 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1933 sock6->sock->sk,
1934 &ndst, &fl6);
1935 if (unlikely(err < 0)) {
1936 netdev_dbg(dev, "no route to %pI6\n", daddr);
1937 return ERR_PTR(-ENETUNREACH);
1938 }
1939
1940 if (unlikely(ndst->dev == dev)) {
1941 netdev_dbg(dev, "circular route to %pI6\n", daddr);
1942 dst_release(ndst);
1943 return ERR_PTR(-ELOOP);
1944 }
1945
1946 *saddr = fl6.saddr;
1947 if (use_cache)
1948 dst_cache_set_ip6(dst_cache, ndst, saddr);
1949 return ndst;
1950 }
1951 #endif
1952
1953 /* Bypass encapsulation if the destination is local */
1954 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1955 struct vxlan_dev *dst_vxlan, __be32 vni)
1956 {
1957 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1958 union vxlan_addr loopback;
1959 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1960 struct net_device *dev = skb->dev;
1961 int len = skb->len;
1962
1963 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1964 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1965 skb->pkt_type = PACKET_HOST;
1966 skb->encapsulation = 0;
1967 skb->dev = dst_vxlan->dev;
1968 __skb_pull(skb, skb_network_offset(skb));
1969
1970 if (remote_ip->sa.sa_family == AF_INET) {
1971 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1972 loopback.sa.sa_family = AF_INET;
1973 #if IS_ENABLED(CONFIG_IPV6)
1974 } else {
1975 loopback.sin6.sin6_addr = in6addr_loopback;
1976 loopback.sa.sa_family = AF_INET6;
1977 #endif
1978 }
1979
1980 if (dst_vxlan->flags & VXLAN_F_LEARN)
1981 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source, vni);
1982
1983 u64_stats_update_begin(&tx_stats->syncp);
1984 tx_stats->tx_packets++;
1985 tx_stats->tx_bytes += len;
1986 u64_stats_update_end(&tx_stats->syncp);
1987
1988 if (netif_rx(skb) == NET_RX_SUCCESS) {
1989 u64_stats_update_begin(&rx_stats->syncp);
1990 rx_stats->rx_packets++;
1991 rx_stats->rx_bytes += len;
1992 u64_stats_update_end(&rx_stats->syncp);
1993 } else {
1994 dev->stats.rx_dropped++;
1995 }
1996 }
1997
1998 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
1999 struct vxlan_dev *vxlan, union vxlan_addr *daddr,
2000 __be16 dst_port, __be32 vni, struct dst_entry *dst,
2001 u32 rt_flags)
2002 {
2003 #if IS_ENABLED(CONFIG_IPV6)
2004 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2005 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2006 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2007 */
2008 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2009 #endif
2010 /* Bypass encapsulation if the destination is local */
2011 if (rt_flags & RTCF_LOCAL &&
2012 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2013 struct vxlan_dev *dst_vxlan;
2014
2015 dst_release(dst);
2016 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2017 daddr->sa.sa_family, dst_port,
2018 vxlan->flags);
2019 if (!dst_vxlan) {
2020 dev->stats.tx_errors++;
2021 kfree_skb(skb);
2022
2023 return -ENOENT;
2024 }
2025 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2026 return 1;
2027 }
2028
2029 return 0;
2030 }
2031
2032 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2033 __be32 default_vni, struct vxlan_rdst *rdst,
2034 bool did_rsc)
2035 {
2036 struct dst_cache *dst_cache;
2037 struct ip_tunnel_info *info;
2038 struct vxlan_dev *vxlan = netdev_priv(dev);
2039 const struct iphdr *old_iph = ip_hdr(skb);
2040 union vxlan_addr *dst;
2041 union vxlan_addr remote_ip, local_ip;
2042 struct vxlan_metadata _md;
2043 struct vxlan_metadata *md = &_md;
2044 __be16 src_port = 0, dst_port;
2045 struct dst_entry *ndst = NULL;
2046 __be32 vni, label;
2047 __u8 tos, ttl;
2048 int err;
2049 u32 flags = vxlan->flags;
2050 bool udp_sum = false;
2051 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2052
2053 info = skb_tunnel_info(skb);
2054
2055 if (rdst) {
2056 dst = &rdst->remote_ip;
2057 if (vxlan_addr_any(dst)) {
2058 if (did_rsc) {
2059 /* short-circuited back to local bridge */
2060 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2061 return;
2062 }
2063 goto drop;
2064 }
2065
2066 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2067 vni = (rdst->remote_vni) ? : default_vni;
2068 local_ip = vxlan->cfg.saddr;
2069 dst_cache = &rdst->dst_cache;
2070 md->gbp = skb->mark;
2071 ttl = vxlan->cfg.ttl;
2072 if (!ttl && vxlan_addr_multicast(dst))
2073 ttl = 1;
2074
2075 tos = vxlan->cfg.tos;
2076 if (tos == 1)
2077 tos = ip_tunnel_get_dsfield(old_iph, skb);
2078
2079 if (dst->sa.sa_family == AF_INET)
2080 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2081 else
2082 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2083 label = vxlan->cfg.label;
2084 } else {
2085 if (!info) {
2086 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2087 dev->name);
2088 goto drop;
2089 }
2090 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2091 if (remote_ip.sa.sa_family == AF_INET) {
2092 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2093 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2094 } else {
2095 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2096 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2097 }
2098 dst = &remote_ip;
2099 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2100 vni = tunnel_id_to_key32(info->key.tun_id);
2101 dst_cache = &info->dst_cache;
2102 if (info->options_len)
2103 md = ip_tunnel_info_opts(info);
2104 ttl = info->key.ttl;
2105 tos = info->key.tos;
2106 label = info->key.label;
2107 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2108 }
2109 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2110 vxlan->cfg.port_max, true);
2111
2112 rcu_read_lock();
2113 if (dst->sa.sa_family == AF_INET) {
2114 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2115 struct rtable *rt;
2116 __be16 df = 0;
2117
2118 rt = vxlan_get_route(vxlan, dev, sock4, skb,
2119 rdst ? rdst->remote_ifindex : 0, tos,
2120 dst->sin.sin_addr.s_addr,
2121 &local_ip.sin.sin_addr.s_addr,
2122 dst_port, src_port,
2123 dst_cache, info);
2124 if (IS_ERR(rt)) {
2125 err = PTR_ERR(rt);
2126 goto tx_error;
2127 }
2128
2129 /* Bypass encapsulation if the destination is local */
2130 if (!info) {
2131 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2132 dst_port, vni, &rt->dst,
2133 rt->rt_flags);
2134 if (err)
2135 goto out_unlock;
2136 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2137 df = htons(IP_DF);
2138 }
2139
2140 ndst = &rt->dst;
2141 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2142 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2143 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2144 vni, md, flags, udp_sum);
2145 if (err < 0)
2146 goto tx_error;
2147
2148 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2149 dst->sin.sin_addr.s_addr, tos, ttl, df,
2150 src_port, dst_port, xnet, !udp_sum);
2151 #if IS_ENABLED(CONFIG_IPV6)
2152 } else {
2153 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2154
2155 ndst = vxlan6_get_route(vxlan, dev, sock6, skb,
2156 rdst ? rdst->remote_ifindex : 0, tos,
2157 label, &dst->sin6.sin6_addr,
2158 &local_ip.sin6.sin6_addr,
2159 dst_port, src_port,
2160 dst_cache, info);
2161 if (IS_ERR(ndst)) {
2162 err = PTR_ERR(ndst);
2163 ndst = NULL;
2164 goto tx_error;
2165 }
2166
2167 if (!info) {
2168 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2169
2170 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2171 dst_port, vni, ndst,
2172 rt6i_flags);
2173 if (err)
2174 goto out_unlock;
2175 }
2176
2177 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2178 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2179 skb_scrub_packet(skb, xnet);
2180 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2181 vni, md, flags, udp_sum);
2182 if (err < 0)
2183 goto tx_error;
2184
2185 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2186 &local_ip.sin6.sin6_addr,
2187 &dst->sin6.sin6_addr, tos, ttl,
2188 label, src_port, dst_port, !udp_sum);
2189 #endif
2190 }
2191 out_unlock:
2192 rcu_read_unlock();
2193 return;
2194
2195 drop:
2196 dev->stats.tx_dropped++;
2197 dev_kfree_skb(skb);
2198 return;
2199
2200 tx_error:
2201 rcu_read_unlock();
2202 if (err == -ELOOP)
2203 dev->stats.collisions++;
2204 else if (err == -ENETUNREACH)
2205 dev->stats.tx_carrier_errors++;
2206 dst_release(ndst);
2207 dev->stats.tx_errors++;
2208 kfree_skb(skb);
2209 }
2210
2211 /* Transmit local packets over Vxlan
2212 *
2213 * Outer IP header inherits ECN and DF from inner header.
2214 * Outer UDP destination is the VXLAN assigned port.
2215 * source port is based on hash of flow
2216 */
2217 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2218 {
2219 struct vxlan_dev *vxlan = netdev_priv(dev);
2220 const struct ip_tunnel_info *info;
2221 struct ethhdr *eth;
2222 bool did_rsc = false;
2223 struct vxlan_rdst *rdst, *fdst = NULL;
2224 struct vxlan_fdb *f;
2225 __be32 vni = 0;
2226
2227 info = skb_tunnel_info(skb);
2228
2229 skb_reset_mac_header(skb);
2230
2231 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2232 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2233 info->mode & IP_TUNNEL_INFO_TX) {
2234 vni = tunnel_id_to_key32(info->key.tun_id);
2235 } else {
2236 if (info && info->mode & IP_TUNNEL_INFO_TX)
2237 vxlan_xmit_one(skb, dev, vni, NULL, false);
2238 else
2239 kfree_skb(skb);
2240 return NETDEV_TX_OK;
2241 }
2242 }
2243
2244 if (vxlan->flags & VXLAN_F_PROXY) {
2245 eth = eth_hdr(skb);
2246 if (ntohs(eth->h_proto) == ETH_P_ARP)
2247 return arp_reduce(dev, skb, vni);
2248 #if IS_ENABLED(CONFIG_IPV6)
2249 else if (ntohs(eth->h_proto) == ETH_P_IPV6) {
2250 struct ipv6hdr *hdr, _hdr;
2251 if ((hdr = skb_header_pointer(skb,
2252 skb_network_offset(skb),
2253 sizeof(_hdr), &_hdr)) &&
2254 hdr->nexthdr == IPPROTO_ICMPV6)
2255 return neigh_reduce(dev, skb, vni);
2256 }
2257 #endif
2258 }
2259
2260 eth = eth_hdr(skb);
2261 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2262 did_rsc = false;
2263
2264 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2265 (ntohs(eth->h_proto) == ETH_P_IP ||
2266 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2267 did_rsc = route_shortcircuit(dev, skb);
2268 if (did_rsc)
2269 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2270 }
2271
2272 if (f == NULL) {
2273 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2274 if (f == NULL) {
2275 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2276 !is_multicast_ether_addr(eth->h_dest))
2277 vxlan_fdb_miss(vxlan, eth->h_dest);
2278
2279 dev->stats.tx_dropped++;
2280 kfree_skb(skb);
2281 return NETDEV_TX_OK;
2282 }
2283 }
2284
2285 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2286 struct sk_buff *skb1;
2287
2288 if (!fdst) {
2289 fdst = rdst;
2290 continue;
2291 }
2292 skb1 = skb_clone(skb, GFP_ATOMIC);
2293 if (skb1)
2294 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2295 }
2296
2297 if (fdst)
2298 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2299 else
2300 kfree_skb(skb);
2301 return NETDEV_TX_OK;
2302 }
2303
2304 /* Walk the forwarding table and purge stale entries */
2305 static void vxlan_cleanup(unsigned long arg)
2306 {
2307 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2308 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2309 unsigned int h;
2310
2311 if (!netif_running(vxlan->dev))
2312 return;
2313
2314 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2315 struct hlist_node *p, *n;
2316
2317 spin_lock_bh(&vxlan->hash_lock);
2318 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2319 struct vxlan_fdb *f
2320 = container_of(p, struct vxlan_fdb, hlist);
2321 unsigned long timeout;
2322
2323 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2324 continue;
2325
2326 if (f->flags & NTF_EXT_LEARNED)
2327 continue;
2328
2329 timeout = f->used + vxlan->cfg.age_interval * HZ;
2330 if (time_before_eq(timeout, jiffies)) {
2331 netdev_dbg(vxlan->dev,
2332 "garbage collect %pM\n",
2333 f->eth_addr);
2334 f->state = NUD_STALE;
2335 vxlan_fdb_destroy(vxlan, f);
2336 } else if (time_before(timeout, next_timer))
2337 next_timer = timeout;
2338 }
2339 spin_unlock_bh(&vxlan->hash_lock);
2340 }
2341
2342 mod_timer(&vxlan->age_timer, next_timer);
2343 }
2344
2345 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2346 {
2347 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2348 __be32 vni = vxlan->default_dst.remote_vni;
2349
2350 spin_lock(&vn->sock_lock);
2351 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2352 spin_unlock(&vn->sock_lock);
2353 }
2354
2355 /* Setup stats when device is created */
2356 static int vxlan_init(struct net_device *dev)
2357 {
2358 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2359 if (!dev->tstats)
2360 return -ENOMEM;
2361
2362 return 0;
2363 }
2364
2365 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2366 {
2367 struct vxlan_fdb *f;
2368
2369 spin_lock_bh(&vxlan->hash_lock);
2370 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2371 if (f)
2372 vxlan_fdb_destroy(vxlan, f);
2373 spin_unlock_bh(&vxlan->hash_lock);
2374 }
2375
2376 static void vxlan_uninit(struct net_device *dev)
2377 {
2378 struct vxlan_dev *vxlan = netdev_priv(dev);
2379
2380 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2381
2382 free_percpu(dev->tstats);
2383 }
2384
2385 /* Start ageing timer and join group when device is brought up */
2386 static int vxlan_open(struct net_device *dev)
2387 {
2388 struct vxlan_dev *vxlan = netdev_priv(dev);
2389 int ret;
2390
2391 ret = vxlan_sock_add(vxlan);
2392 if (ret < 0)
2393 return ret;
2394
2395 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2396 ret = vxlan_igmp_join(vxlan);
2397 if (ret == -EADDRINUSE)
2398 ret = 0;
2399 if (ret) {
2400 vxlan_sock_release(vxlan);
2401 return ret;
2402 }
2403 }
2404
2405 if (vxlan->cfg.age_interval)
2406 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2407
2408 return ret;
2409 }
2410
2411 /* Purge the forwarding table */
2412 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2413 {
2414 unsigned int h;
2415
2416 spin_lock_bh(&vxlan->hash_lock);
2417 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2418 struct hlist_node *p, *n;
2419 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2420 struct vxlan_fdb *f
2421 = container_of(p, struct vxlan_fdb, hlist);
2422 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2423 continue;
2424 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2425 if (!is_zero_ether_addr(f->eth_addr))
2426 vxlan_fdb_destroy(vxlan, f);
2427 }
2428 }
2429 spin_unlock_bh(&vxlan->hash_lock);
2430 }
2431
2432 /* Cleanup timer and forwarding table on shutdown */
2433 static int vxlan_stop(struct net_device *dev)
2434 {
2435 struct vxlan_dev *vxlan = netdev_priv(dev);
2436 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2437 int ret = 0;
2438
2439 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2440 !vxlan_group_used(vn, vxlan))
2441 ret = vxlan_igmp_leave(vxlan);
2442
2443 del_timer_sync(&vxlan->age_timer);
2444
2445 vxlan_flush(vxlan, false);
2446 vxlan_sock_release(vxlan);
2447
2448 return ret;
2449 }
2450
2451 /* Stub, nothing needs to be done. */
2452 static void vxlan_set_multicast_list(struct net_device *dev)
2453 {
2454 }
2455
2456 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2457 {
2458 struct vxlan_dev *vxlan = netdev_priv(dev);
2459 struct vxlan_rdst *dst = &vxlan->default_dst;
2460 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2461 dst->remote_ifindex);
2462 bool use_ipv6 = false;
2463
2464 if (dst->remote_ip.sa.sa_family == AF_INET6)
2465 use_ipv6 = true;
2466
2467 /* This check is different than dev->max_mtu, because it looks at
2468 * the lowerdev->mtu, rather than the static dev->max_mtu
2469 */
2470 if (lowerdev) {
2471 int max_mtu = lowerdev->mtu -
2472 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2473 if (new_mtu > max_mtu)
2474 return -EINVAL;
2475 }
2476
2477 dev->mtu = new_mtu;
2478 return 0;
2479 }
2480
2481 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2482 {
2483 struct vxlan_dev *vxlan = netdev_priv(dev);
2484 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2485 __be16 sport, dport;
2486
2487 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2488 vxlan->cfg.port_max, true);
2489 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2490
2491 if (ip_tunnel_info_af(info) == AF_INET) {
2492 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2493 struct rtable *rt;
2494
2495 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2496 info->key.u.ipv4.dst,
2497 &info->key.u.ipv4.src, dport, sport,
2498 &info->dst_cache, info);
2499 if (IS_ERR(rt))
2500 return PTR_ERR(rt);
2501 ip_rt_put(rt);
2502 } else {
2503 #if IS_ENABLED(CONFIG_IPV6)
2504 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2505 struct dst_entry *ndst;
2506
2507 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2508 info->key.label, &info->key.u.ipv6.dst,
2509 &info->key.u.ipv6.src, dport, sport,
2510 &info->dst_cache, info);
2511 if (IS_ERR(ndst))
2512 return PTR_ERR(ndst);
2513 dst_release(ndst);
2514 #else /* !CONFIG_IPV6 */
2515 return -EPFNOSUPPORT;
2516 #endif
2517 }
2518 info->key.tp_src = sport;
2519 info->key.tp_dst = dport;
2520 return 0;
2521 }
2522
2523 static const struct net_device_ops vxlan_netdev_ether_ops = {
2524 .ndo_init = vxlan_init,
2525 .ndo_uninit = vxlan_uninit,
2526 .ndo_open = vxlan_open,
2527 .ndo_stop = vxlan_stop,
2528 .ndo_start_xmit = vxlan_xmit,
2529 .ndo_get_stats64 = ip_tunnel_get_stats64,
2530 .ndo_set_rx_mode = vxlan_set_multicast_list,
2531 .ndo_change_mtu = vxlan_change_mtu,
2532 .ndo_validate_addr = eth_validate_addr,
2533 .ndo_set_mac_address = eth_mac_addr,
2534 .ndo_fdb_add = vxlan_fdb_add,
2535 .ndo_fdb_del = vxlan_fdb_delete,
2536 .ndo_fdb_dump = vxlan_fdb_dump,
2537 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2538 };
2539
2540 static const struct net_device_ops vxlan_netdev_raw_ops = {
2541 .ndo_init = vxlan_init,
2542 .ndo_uninit = vxlan_uninit,
2543 .ndo_open = vxlan_open,
2544 .ndo_stop = vxlan_stop,
2545 .ndo_start_xmit = vxlan_xmit,
2546 .ndo_get_stats64 = ip_tunnel_get_stats64,
2547 .ndo_change_mtu = vxlan_change_mtu,
2548 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2549 };
2550
2551 /* Info for udev, that this is a virtual tunnel endpoint */
2552 static struct device_type vxlan_type = {
2553 .name = "vxlan",
2554 };
2555
2556 /* Calls the ndo_udp_tunnel_add of the caller in order to
2557 * supply the listening VXLAN udp ports. Callers are expected
2558 * to implement the ndo_udp_tunnel_add.
2559 */
2560 static void vxlan_push_rx_ports(struct net_device *dev)
2561 {
2562 struct vxlan_sock *vs;
2563 struct net *net = dev_net(dev);
2564 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2565 unsigned int i;
2566
2567 spin_lock(&vn->sock_lock);
2568 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2569 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist)
2570 udp_tunnel_push_rx_port(dev, vs->sock,
2571 (vs->flags & VXLAN_F_GPE) ?
2572 UDP_TUNNEL_TYPE_VXLAN_GPE :
2573 UDP_TUNNEL_TYPE_VXLAN);
2574 }
2575 spin_unlock(&vn->sock_lock);
2576 }
2577
2578 /* Initialize the device structure. */
2579 static void vxlan_setup(struct net_device *dev)
2580 {
2581 struct vxlan_dev *vxlan = netdev_priv(dev);
2582 unsigned int h;
2583
2584 eth_hw_addr_random(dev);
2585 ether_setup(dev);
2586
2587 dev->destructor = free_netdev;
2588 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2589
2590 dev->features |= NETIF_F_LLTX;
2591 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2592 dev->features |= NETIF_F_RXCSUM;
2593 dev->features |= NETIF_F_GSO_SOFTWARE;
2594
2595 dev->vlan_features = dev->features;
2596 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2597 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2598 netif_keep_dst(dev);
2599 dev->priv_flags |= IFF_NO_QUEUE;
2600
2601 INIT_LIST_HEAD(&vxlan->next);
2602 spin_lock_init(&vxlan->hash_lock);
2603
2604 init_timer_deferrable(&vxlan->age_timer);
2605 vxlan->age_timer.function = vxlan_cleanup;
2606 vxlan->age_timer.data = (unsigned long) vxlan;
2607
2608 vxlan->cfg.dst_port = htons(vxlan_port);
2609
2610 vxlan->dev = dev;
2611
2612 gro_cells_init(&vxlan->gro_cells, dev);
2613
2614 for (h = 0; h < FDB_HASH_SIZE; ++h)
2615 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2616 }
2617
2618 static void vxlan_ether_setup(struct net_device *dev)
2619 {
2620 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2621 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2622 dev->netdev_ops = &vxlan_netdev_ether_ops;
2623 }
2624
2625 static void vxlan_raw_setup(struct net_device *dev)
2626 {
2627 dev->header_ops = NULL;
2628 dev->type = ARPHRD_NONE;
2629 dev->hard_header_len = 0;
2630 dev->addr_len = 0;
2631 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2632 dev->netdev_ops = &vxlan_netdev_raw_ops;
2633 }
2634
2635 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2636 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2637 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2638 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2639 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2640 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2641 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2642 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2643 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2644 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2645 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2646 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2647 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2648 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2649 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2650 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2651 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2652 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2653 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2654 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2655 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2656 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2657 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2658 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2659 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2660 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2661 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2662 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2663 };
2664
2665 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2666 {
2667 if (tb[IFLA_ADDRESS]) {
2668 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2669 pr_debug("invalid link address (not ethernet)\n");
2670 return -EINVAL;
2671 }
2672
2673 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2674 pr_debug("invalid all zero ethernet address\n");
2675 return -EADDRNOTAVAIL;
2676 }
2677 }
2678
2679 if (!data)
2680 return -EINVAL;
2681
2682 if (data[IFLA_VXLAN_ID]) {
2683 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2684 if (id >= VXLAN_N_VID)
2685 return -ERANGE;
2686 }
2687
2688 if (data[IFLA_VXLAN_PORT_RANGE]) {
2689 const struct ifla_vxlan_port_range *p
2690 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2691
2692 if (ntohs(p->high) < ntohs(p->low)) {
2693 pr_debug("port range %u .. %u not valid\n",
2694 ntohs(p->low), ntohs(p->high));
2695 return -EINVAL;
2696 }
2697 }
2698
2699 return 0;
2700 }
2701
2702 static void vxlan_get_drvinfo(struct net_device *netdev,
2703 struct ethtool_drvinfo *drvinfo)
2704 {
2705 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2706 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2707 }
2708
2709 static const struct ethtool_ops vxlan_ethtool_ops = {
2710 .get_drvinfo = vxlan_get_drvinfo,
2711 .get_link = ethtool_op_get_link,
2712 };
2713
2714 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2715 __be16 port, u32 flags)
2716 {
2717 struct socket *sock;
2718 struct udp_port_cfg udp_conf;
2719 int err;
2720
2721 memset(&udp_conf, 0, sizeof(udp_conf));
2722
2723 if (ipv6) {
2724 udp_conf.family = AF_INET6;
2725 udp_conf.use_udp6_rx_checksums =
2726 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2727 udp_conf.ipv6_v6only = 1;
2728 } else {
2729 udp_conf.family = AF_INET;
2730 }
2731
2732 udp_conf.local_udp_port = port;
2733
2734 /* Open UDP socket */
2735 err = udp_sock_create(net, &udp_conf, &sock);
2736 if (err < 0)
2737 return ERR_PTR(err);
2738
2739 return sock;
2740 }
2741
2742 /* Create new listen socket if needed */
2743 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2744 __be16 port, u32 flags)
2745 {
2746 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2747 struct vxlan_sock *vs;
2748 struct socket *sock;
2749 unsigned int h;
2750 struct udp_tunnel_sock_cfg tunnel_cfg;
2751
2752 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2753 if (!vs)
2754 return ERR_PTR(-ENOMEM);
2755
2756 for (h = 0; h < VNI_HASH_SIZE; ++h)
2757 INIT_HLIST_HEAD(&vs->vni_list[h]);
2758
2759 sock = vxlan_create_sock(net, ipv6, port, flags);
2760 if (IS_ERR(sock)) {
2761 kfree(vs);
2762 return ERR_CAST(sock);
2763 }
2764
2765 vs->sock = sock;
2766 atomic_set(&vs->refcnt, 1);
2767 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2768
2769 spin_lock(&vn->sock_lock);
2770 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2771 udp_tunnel_notify_add_rx_port(sock,
2772 (vs->flags & VXLAN_F_GPE) ?
2773 UDP_TUNNEL_TYPE_VXLAN_GPE :
2774 UDP_TUNNEL_TYPE_VXLAN);
2775 spin_unlock(&vn->sock_lock);
2776
2777 /* Mark socket as an encapsulation socket. */
2778 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2779 tunnel_cfg.sk_user_data = vs;
2780 tunnel_cfg.encap_type = 1;
2781 tunnel_cfg.encap_rcv = vxlan_rcv;
2782 tunnel_cfg.encap_destroy = NULL;
2783 tunnel_cfg.gro_receive = vxlan_gro_receive;
2784 tunnel_cfg.gro_complete = vxlan_gro_complete;
2785
2786 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2787
2788 return vs;
2789 }
2790
2791 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2792 {
2793 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2794 struct vxlan_sock *vs = NULL;
2795
2796 if (!vxlan->cfg.no_share) {
2797 spin_lock(&vn->sock_lock);
2798 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2799 vxlan->cfg.dst_port, vxlan->flags);
2800 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2801 spin_unlock(&vn->sock_lock);
2802 return -EBUSY;
2803 }
2804 spin_unlock(&vn->sock_lock);
2805 }
2806 if (!vs)
2807 vs = vxlan_socket_create(vxlan->net, ipv6,
2808 vxlan->cfg.dst_port, vxlan->flags);
2809 if (IS_ERR(vs))
2810 return PTR_ERR(vs);
2811 #if IS_ENABLED(CONFIG_IPV6)
2812 if (ipv6)
2813 rcu_assign_pointer(vxlan->vn6_sock, vs);
2814 else
2815 #endif
2816 rcu_assign_pointer(vxlan->vn4_sock, vs);
2817 vxlan_vs_add_dev(vs, vxlan);
2818 return 0;
2819 }
2820
2821 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2822 {
2823 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2824 bool ipv6 = vxlan->flags & VXLAN_F_IPV6 || metadata;
2825 bool ipv4 = !ipv6 || metadata;
2826 int ret = 0;
2827
2828 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2829 #if IS_ENABLED(CONFIG_IPV6)
2830 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2831 if (ipv6) {
2832 ret = __vxlan_sock_add(vxlan, true);
2833 if (ret < 0 && ret != -EAFNOSUPPORT)
2834 ipv4 = false;
2835 }
2836 #endif
2837 if (ipv4)
2838 ret = __vxlan_sock_add(vxlan, false);
2839 if (ret < 0)
2840 vxlan_sock_release(vxlan);
2841 return ret;
2842 }
2843
2844 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2845 struct vxlan_config *conf,
2846 bool changelink)
2847 {
2848 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2849 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2850 struct vxlan_rdst *dst = &vxlan->default_dst;
2851 unsigned short needed_headroom = ETH_HLEN;
2852 bool use_ipv6 = false;
2853 __be16 default_port = vxlan->cfg.dst_port;
2854 struct net_device *lowerdev = NULL;
2855
2856 if (!changelink) {
2857 if (conf->flags & VXLAN_F_GPE) {
2858 /* For now, allow GPE only together with
2859 * COLLECT_METADATA. This can be relaxed later; in such
2860 * case, the other side of the PtP link will have to be
2861 * provided.
2862 */
2863 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
2864 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2865 pr_info("unsupported combination of extensions\n");
2866 return -EINVAL;
2867 }
2868 vxlan_raw_setup(dev);
2869 } else {
2870 vxlan_ether_setup(dev);
2871 }
2872
2873 /* MTU range: 68 - 65535 */
2874 dev->min_mtu = ETH_MIN_MTU;
2875 dev->max_mtu = ETH_MAX_MTU;
2876 vxlan->net = src_net;
2877 }
2878
2879 dst->remote_vni = conf->vni;
2880
2881 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2882
2883 /* Unless IPv6 is explicitly requested, assume IPv4 */
2884 if (!dst->remote_ip.sa.sa_family)
2885 dst->remote_ip.sa.sa_family = AF_INET;
2886
2887 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2888 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2889 if (!IS_ENABLED(CONFIG_IPV6))
2890 return -EPFNOSUPPORT;
2891 use_ipv6 = true;
2892 vxlan->flags |= VXLAN_F_IPV6;
2893 }
2894
2895 if (conf->label && !use_ipv6) {
2896 pr_info("label only supported in use with IPv6\n");
2897 return -EINVAL;
2898 }
2899
2900 if (conf->remote_ifindex &&
2901 conf->remote_ifindex != vxlan->cfg.remote_ifindex) {
2902 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2903 dst->remote_ifindex = conf->remote_ifindex;
2904
2905 if (!lowerdev) {
2906 pr_info("ifindex %d does not exist\n",
2907 dst->remote_ifindex);
2908 return -ENODEV;
2909 }
2910
2911 #if IS_ENABLED(CONFIG_IPV6)
2912 if (use_ipv6) {
2913 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2914 if (idev && idev->cnf.disable_ipv6) {
2915 pr_info("IPv6 is disabled via sysctl\n");
2916 return -EPERM;
2917 }
2918 }
2919 #endif
2920
2921 if (!conf->mtu)
2922 dev->mtu = lowerdev->mtu -
2923 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2924
2925 needed_headroom = lowerdev->hard_header_len;
2926 } else if (!conf->remote_ifindex &&
2927 vxlan_addr_multicast(&dst->remote_ip)) {
2928 pr_info("multicast destination requires interface to be specified\n");
2929 return -EINVAL;
2930 }
2931
2932 if (lowerdev) {
2933 dev->gso_max_size = lowerdev->gso_max_size;
2934 dev->gso_max_segs = lowerdev->gso_max_segs;
2935 }
2936
2937 if (conf->mtu) {
2938 int max_mtu = ETH_MAX_MTU;
2939
2940 if (lowerdev)
2941 max_mtu = lowerdev->mtu;
2942
2943 max_mtu -= (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2944
2945 if (conf->mtu < dev->min_mtu || conf->mtu > dev->max_mtu)
2946 return -EINVAL;
2947
2948 dev->mtu = conf->mtu;
2949
2950 if (conf->mtu > max_mtu)
2951 dev->mtu = max_mtu;
2952 }
2953
2954 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2955 needed_headroom += VXLAN6_HEADROOM;
2956 else
2957 needed_headroom += VXLAN_HEADROOM;
2958 dev->needed_headroom = needed_headroom;
2959
2960 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2961 if (!vxlan->cfg.dst_port) {
2962 if (conf->flags & VXLAN_F_GPE)
2963 vxlan->cfg.dst_port = htons(4790); /* IANA VXLAN-GPE port */
2964 else
2965 vxlan->cfg.dst_port = default_port;
2966 }
2967 vxlan->flags |= conf->flags;
2968
2969 if (!vxlan->cfg.age_interval)
2970 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2971
2972 if (changelink)
2973 return 0;
2974
2975 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2976 if (tmp->cfg.vni == conf->vni &&
2977 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2978 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2979 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2980 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2981 (vxlan->flags & VXLAN_F_RCV_FLAGS)) {
2982 pr_info("duplicate VNI %u\n", be32_to_cpu(conf->vni));
2983 return -EEXIST;
2984 }
2985 }
2986
2987 return 0;
2988 }
2989
2990 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
2991 struct vxlan_config *conf)
2992 {
2993 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2994 struct vxlan_dev *vxlan = netdev_priv(dev);
2995 int err;
2996
2997 err = vxlan_dev_configure(net, dev, conf, false);
2998 if (err)
2999 return err;
3000
3001 dev->ethtool_ops = &vxlan_ethtool_ops;
3002
3003 /* create an fdb entry for a valid default destination */
3004 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3005 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3006 &vxlan->default_dst.remote_ip,
3007 NUD_REACHABLE | NUD_PERMANENT,
3008 NLM_F_EXCL | NLM_F_CREATE,
3009 vxlan->cfg.dst_port,
3010 vxlan->default_dst.remote_vni,
3011 vxlan->default_dst.remote_vni,
3012 vxlan->default_dst.remote_ifindex,
3013 NTF_SELF);
3014 if (err)
3015 return err;
3016 }
3017
3018 err = register_netdevice(dev);
3019 if (err) {
3020 vxlan_fdb_delete_default(vxlan, vxlan->default_dst.remote_vni);
3021 return err;
3022 }
3023
3024 list_add(&vxlan->next, &vn->vxlan_list);
3025 return 0;
3026 }
3027
3028 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3029 struct net_device *dev, struct vxlan_config *conf,
3030 bool changelink)
3031 {
3032 struct vxlan_dev *vxlan = netdev_priv(dev);
3033
3034 memset(conf, 0, sizeof(*conf));
3035
3036 /* if changelink operation, start with old existing cfg */
3037 if (changelink)
3038 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3039
3040 if (data[IFLA_VXLAN_ID]) {
3041 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3042
3043 if (changelink && (vni != conf->vni))
3044 return -EOPNOTSUPP;
3045 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3046 }
3047
3048 if (data[IFLA_VXLAN_GROUP]) {
3049 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3050 } else if (data[IFLA_VXLAN_GROUP6]) {
3051 if (!IS_ENABLED(CONFIG_IPV6))
3052 return -EPFNOSUPPORT;
3053
3054 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3055 conf->remote_ip.sa.sa_family = AF_INET6;
3056 }
3057
3058 if (data[IFLA_VXLAN_LOCAL]) {
3059 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3060 conf->saddr.sa.sa_family = AF_INET;
3061 } else if (data[IFLA_VXLAN_LOCAL6]) {
3062 if (!IS_ENABLED(CONFIG_IPV6))
3063 return -EPFNOSUPPORT;
3064
3065 /* TODO: respect scope id */
3066 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3067 conf->saddr.sa.sa_family = AF_INET6;
3068 }
3069
3070 if (data[IFLA_VXLAN_LINK])
3071 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3072
3073 if (data[IFLA_VXLAN_TOS])
3074 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3075
3076 if (data[IFLA_VXLAN_TTL])
3077 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3078
3079 if (data[IFLA_VXLAN_LABEL])
3080 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3081 IPV6_FLOWLABEL_MASK;
3082
3083 if (data[IFLA_VXLAN_LEARNING]) {
3084 if (nla_get_u8(data[IFLA_VXLAN_LEARNING])) {
3085 conf->flags |= VXLAN_F_LEARN;
3086 } else {
3087 conf->flags &= ~VXLAN_F_LEARN;
3088 vxlan->flags &= ~VXLAN_F_LEARN;
3089 }
3090 } else if (!changelink) {
3091 /* default to learn on a new device */
3092 conf->flags |= VXLAN_F_LEARN;
3093 }
3094
3095 if (data[IFLA_VXLAN_AGEING]) {
3096 if (changelink)
3097 return -EOPNOTSUPP;
3098 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3099 }
3100
3101 if (data[IFLA_VXLAN_PROXY]) {
3102 if (changelink)
3103 return -EOPNOTSUPP;
3104 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3105 conf->flags |= VXLAN_F_PROXY;
3106 }
3107
3108 if (data[IFLA_VXLAN_RSC]) {
3109 if (changelink)
3110 return -EOPNOTSUPP;
3111 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3112 conf->flags |= VXLAN_F_RSC;
3113 }
3114
3115 if (data[IFLA_VXLAN_L2MISS]) {
3116 if (changelink)
3117 return -EOPNOTSUPP;
3118 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3119 conf->flags |= VXLAN_F_L2MISS;
3120 }
3121
3122 if (data[IFLA_VXLAN_L3MISS]) {
3123 if (changelink)
3124 return -EOPNOTSUPP;
3125 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3126 conf->flags |= VXLAN_F_L3MISS;
3127 }
3128
3129 if (data[IFLA_VXLAN_LIMIT]) {
3130 if (changelink)
3131 return -EOPNOTSUPP;
3132 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3133 }
3134
3135 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3136 if (changelink)
3137 return -EOPNOTSUPP;
3138 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3139 conf->flags |= VXLAN_F_COLLECT_METADATA;
3140 }
3141
3142 if (data[IFLA_VXLAN_PORT_RANGE]) {
3143 if (!changelink) {
3144 const struct ifla_vxlan_port_range *p
3145 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3146 conf->port_min = ntohs(p->low);
3147 conf->port_max = ntohs(p->high);
3148 } else {
3149 return -EOPNOTSUPP;
3150 }
3151 }
3152
3153 if (data[IFLA_VXLAN_PORT]) {
3154 if (changelink)
3155 return -EOPNOTSUPP;
3156 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3157 }
3158
3159 if (data[IFLA_VXLAN_UDP_CSUM]) {
3160 if (changelink)
3161 return -EOPNOTSUPP;
3162 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3163 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3164 }
3165
3166 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3167 if (changelink)
3168 return -EOPNOTSUPP;
3169 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3170 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3171 }
3172
3173 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3174 if (changelink)
3175 return -EOPNOTSUPP;
3176 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3177 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3178 }
3179
3180 if (data[IFLA_VXLAN_REMCSUM_TX]) {
3181 if (changelink)
3182 return -EOPNOTSUPP;
3183 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3184 conf->flags |= VXLAN_F_REMCSUM_TX;
3185 }
3186
3187 if (data[IFLA_VXLAN_REMCSUM_RX]) {
3188 if (changelink)
3189 return -EOPNOTSUPP;
3190 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3191 conf->flags |= VXLAN_F_REMCSUM_RX;
3192 }
3193
3194 if (data[IFLA_VXLAN_GBP]) {
3195 if (changelink)
3196 return -EOPNOTSUPP;
3197 conf->flags |= VXLAN_F_GBP;
3198 }
3199
3200 if (data[IFLA_VXLAN_GPE]) {
3201 if (changelink)
3202 return -EOPNOTSUPP;
3203 conf->flags |= VXLAN_F_GPE;
3204 }
3205
3206 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3207 if (changelink)
3208 return -EOPNOTSUPP;
3209 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3210 }
3211
3212 if (tb[IFLA_MTU]) {
3213 if (changelink)
3214 return -EOPNOTSUPP;
3215 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3216 }
3217
3218 return 0;
3219 }
3220
3221 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3222 struct nlattr *tb[], struct nlattr *data[])
3223 {
3224 struct vxlan_config conf;
3225 int err;
3226
3227 err = vxlan_nl2conf(tb, data, dev, &conf, false);
3228 if (err)
3229 return err;
3230
3231 return __vxlan_dev_create(src_net, dev, &conf);
3232 }
3233
3234 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3235 struct nlattr *data[])
3236 {
3237 struct vxlan_dev *vxlan = netdev_priv(dev);
3238 struct vxlan_rdst *dst = &vxlan->default_dst;
3239 struct vxlan_rdst old_dst;
3240 struct vxlan_config conf;
3241 int err;
3242
3243 err = vxlan_nl2conf(tb, data,
3244 dev, &conf, true);
3245 if (err)
3246 return err;
3247
3248 memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3249
3250 err = vxlan_dev_configure(vxlan->net, dev, &conf, true);
3251 if (err)
3252 return err;
3253
3254 /* handle default dst entry */
3255 if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3256 spin_lock_bh(&vxlan->hash_lock);
3257 if (!vxlan_addr_any(&old_dst.remote_ip))
3258 __vxlan_fdb_delete(vxlan, all_zeros_mac,
3259 old_dst.remote_ip,
3260 vxlan->cfg.dst_port,
3261 old_dst.remote_vni,
3262 old_dst.remote_vni,
3263 old_dst.remote_ifindex, 0);
3264
3265 if (!vxlan_addr_any(&dst->remote_ip)) {
3266 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3267 &dst->remote_ip,
3268 NUD_REACHABLE | NUD_PERMANENT,
3269 NLM_F_CREATE | NLM_F_APPEND,
3270 vxlan->cfg.dst_port,
3271 dst->remote_vni,
3272 dst->remote_vni,
3273 dst->remote_ifindex,
3274 NTF_SELF);
3275 if (err) {
3276 spin_unlock_bh(&vxlan->hash_lock);
3277 return err;
3278 }
3279 }
3280 spin_unlock_bh(&vxlan->hash_lock);
3281 }
3282
3283 return 0;
3284 }
3285
3286 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3287 {
3288 struct vxlan_dev *vxlan = netdev_priv(dev);
3289 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3290
3291 vxlan_flush(vxlan, true);
3292
3293 spin_lock(&vn->sock_lock);
3294 if (!hlist_unhashed(&vxlan->hlist))
3295 hlist_del_rcu(&vxlan->hlist);
3296 spin_unlock(&vn->sock_lock);
3297
3298 gro_cells_destroy(&vxlan->gro_cells);
3299 list_del(&vxlan->next);
3300 unregister_netdevice_queue(dev, head);
3301 }
3302
3303 static size_t vxlan_get_size(const struct net_device *dev)
3304 {
3305
3306 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3307 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3308 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3309 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3310 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3311 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3312 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3313 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3314 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3315 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3316 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3317 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3318 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3319 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3320 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3321 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3322 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3323 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3324 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3325 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3326 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3327 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3328 0;
3329 }
3330
3331 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3332 {
3333 const struct vxlan_dev *vxlan = netdev_priv(dev);
3334 const struct vxlan_rdst *dst = &vxlan->default_dst;
3335 struct ifla_vxlan_port_range ports = {
3336 .low = htons(vxlan->cfg.port_min),
3337 .high = htons(vxlan->cfg.port_max),
3338 };
3339
3340 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3341 goto nla_put_failure;
3342
3343 if (!vxlan_addr_any(&dst->remote_ip)) {
3344 if (dst->remote_ip.sa.sa_family == AF_INET) {
3345 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3346 dst->remote_ip.sin.sin_addr.s_addr))
3347 goto nla_put_failure;
3348 #if IS_ENABLED(CONFIG_IPV6)
3349 } else {
3350 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3351 &dst->remote_ip.sin6.sin6_addr))
3352 goto nla_put_failure;
3353 #endif
3354 }
3355 }
3356
3357 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3358 goto nla_put_failure;
3359
3360 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3361 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3362 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3363 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3364 goto nla_put_failure;
3365 #if IS_ENABLED(CONFIG_IPV6)
3366 } else {
3367 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3368 &vxlan->cfg.saddr.sin6.sin6_addr))
3369 goto nla_put_failure;
3370 #endif
3371 }
3372 }
3373
3374 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3375 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3376 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3377 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3378 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3379 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3380 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3381 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3382 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3383 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3384 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3385 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3386 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3387 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3388 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3389 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3390 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3391 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3392 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3393 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3394 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3395 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3396 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3397 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3398 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3399 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3400 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3401 goto nla_put_failure;
3402
3403 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3404 goto nla_put_failure;
3405
3406 if (vxlan->flags & VXLAN_F_GBP &&
3407 nla_put_flag(skb, IFLA_VXLAN_GBP))
3408 goto nla_put_failure;
3409
3410 if (vxlan->flags & VXLAN_F_GPE &&
3411 nla_put_flag(skb, IFLA_VXLAN_GPE))
3412 goto nla_put_failure;
3413
3414 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3415 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3416 goto nla_put_failure;
3417
3418 return 0;
3419
3420 nla_put_failure:
3421 return -EMSGSIZE;
3422 }
3423
3424 static struct net *vxlan_get_link_net(const struct net_device *dev)
3425 {
3426 struct vxlan_dev *vxlan = netdev_priv(dev);
3427
3428 return vxlan->net;
3429 }
3430
3431 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3432 .kind = "vxlan",
3433 .maxtype = IFLA_VXLAN_MAX,
3434 .policy = vxlan_policy,
3435 .priv_size = sizeof(struct vxlan_dev),
3436 .setup = vxlan_setup,
3437 .validate = vxlan_validate,
3438 .newlink = vxlan_newlink,
3439 .changelink = vxlan_changelink,
3440 .dellink = vxlan_dellink,
3441 .get_size = vxlan_get_size,
3442 .fill_info = vxlan_fill_info,
3443 .get_link_net = vxlan_get_link_net,
3444 };
3445
3446 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3447 u8 name_assign_type,
3448 struct vxlan_config *conf)
3449 {
3450 struct nlattr *tb[IFLA_MAX + 1];
3451 struct net_device *dev;
3452 int err;
3453
3454 memset(&tb, 0, sizeof(tb));
3455
3456 dev = rtnl_create_link(net, name, name_assign_type,
3457 &vxlan_link_ops, tb);
3458 if (IS_ERR(dev))
3459 return dev;
3460
3461 err = __vxlan_dev_create(net, dev, conf);
3462 if (err < 0) {
3463 free_netdev(dev);
3464 return ERR_PTR(err);
3465 }
3466
3467 err = rtnl_configure_link(dev, NULL);
3468 if (err < 0) {
3469 LIST_HEAD(list_kill);
3470
3471 vxlan_dellink(dev, &list_kill);
3472 unregister_netdevice_many(&list_kill);
3473 return ERR_PTR(err);
3474 }
3475
3476 return dev;
3477 }
3478 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3479
3480 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3481 struct net_device *dev)
3482 {
3483 struct vxlan_dev *vxlan, *next;
3484 LIST_HEAD(list_kill);
3485
3486 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3487 struct vxlan_rdst *dst = &vxlan->default_dst;
3488
3489 /* In case we created vxlan device with carrier
3490 * and we loose the carrier due to module unload
3491 * we also need to remove vxlan device. In other
3492 * cases, it's not necessary and remote_ifindex
3493 * is 0 here, so no matches.
3494 */
3495 if (dst->remote_ifindex == dev->ifindex)
3496 vxlan_dellink(vxlan->dev, &list_kill);
3497 }
3498
3499 unregister_netdevice_many(&list_kill);
3500 }
3501
3502 static int vxlan_netdevice_event(struct notifier_block *unused,
3503 unsigned long event, void *ptr)
3504 {
3505 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3506 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3507
3508 if (event == NETDEV_UNREGISTER)
3509 vxlan_handle_lowerdev_unregister(vn, dev);
3510 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
3511 vxlan_push_rx_ports(dev);
3512
3513 return NOTIFY_DONE;
3514 }
3515
3516 static struct notifier_block vxlan_notifier_block __read_mostly = {
3517 .notifier_call = vxlan_netdevice_event,
3518 };
3519
3520 static __net_init int vxlan_init_net(struct net *net)
3521 {
3522 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3523 unsigned int h;
3524
3525 INIT_LIST_HEAD(&vn->vxlan_list);
3526 spin_lock_init(&vn->sock_lock);
3527
3528 for (h = 0; h < PORT_HASH_SIZE; ++h)
3529 INIT_HLIST_HEAD(&vn->sock_list[h]);
3530
3531 return 0;
3532 }
3533
3534 static void __net_exit vxlan_exit_net(struct net *net)
3535 {
3536 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3537 struct vxlan_dev *vxlan, *next;
3538 struct net_device *dev, *aux;
3539 LIST_HEAD(list);
3540
3541 rtnl_lock();
3542 for_each_netdev_safe(net, dev, aux)
3543 if (dev->rtnl_link_ops == &vxlan_link_ops)
3544 unregister_netdevice_queue(dev, &list);
3545
3546 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3547 /* If vxlan->dev is in the same netns, it has already been added
3548 * to the list by the previous loop.
3549 */
3550 if (!net_eq(dev_net(vxlan->dev), net)) {
3551 gro_cells_destroy(&vxlan->gro_cells);
3552 unregister_netdevice_queue(vxlan->dev, &list);
3553 }
3554 }
3555
3556 unregister_netdevice_many(&list);
3557 rtnl_unlock();
3558 }
3559
3560 static struct pernet_operations vxlan_net_ops = {
3561 .init = vxlan_init_net,
3562 .exit = vxlan_exit_net,
3563 .id = &vxlan_net_id,
3564 .size = sizeof(struct vxlan_net),
3565 };
3566
3567 static int __init vxlan_init_module(void)
3568 {
3569 int rc;
3570
3571 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3572
3573 rc = register_pernet_subsys(&vxlan_net_ops);
3574 if (rc)
3575 goto out1;
3576
3577 rc = register_netdevice_notifier(&vxlan_notifier_block);
3578 if (rc)
3579 goto out2;
3580
3581 rc = rtnl_link_register(&vxlan_link_ops);
3582 if (rc)
3583 goto out3;
3584
3585 return 0;
3586 out3:
3587 unregister_netdevice_notifier(&vxlan_notifier_block);
3588 out2:
3589 unregister_pernet_subsys(&vxlan_net_ops);
3590 out1:
3591 return rc;
3592 }
3593 late_initcall(vxlan_init_module);
3594
3595 static void __exit vxlan_cleanup_module(void)
3596 {
3597 rtnl_link_unregister(&vxlan_link_ops);
3598 unregister_netdevice_notifier(&vxlan_notifier_block);
3599 unregister_pernet_subsys(&vxlan_net_ops);
3600 /* rcu_barrier() is called by netns */
3601 }
3602 module_exit(vxlan_cleanup_module);
3603
3604 MODULE_LICENSE("GPL");
3605 MODULE_VERSION(VXLAN_VERSION);
3606 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3607 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3608 MODULE_ALIAS_RTNL_LINK("vxlan");
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