Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/drivers/net/vxlan.c

  1 /*
  2  * VXLAN: Virtual eXtensible Local Area Network
  3  *
  4  * Copyright (c) 2012-2013 Vyatta Inc.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 
 11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 12 
 13 #include <linux/kernel.h>
 14 #include <linux/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         u8                flags;        /* see ndm_flags */
 79 };
 80 
 81 /* salt for hash table */
 82 static u32 vxlan_salt __read_mostly;
 83 
 84 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
 85 {
 86         return vs->flags & VXLAN_F_COLLECT_METADATA ||
 87                ip_tunnel_collect_metadata();
 88 }
 89 
 90 #if IS_ENABLED(CONFIG_IPV6)
 91 static inline
 92 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 93 {
 94         if (a->sa.sa_family != b->sa.sa_family)
 95                 return false;
 96         if (a->sa.sa_family == AF_INET6)
 97                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 98         else
 99                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
100 }
101 
102 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
103 {
104         if (ipa->sa.sa_family == AF_INET6)
105                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
106         else
107                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
108 }
109 
110 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
111 {
112         if (ipa->sa.sa_family == AF_INET6)
113                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
114         else
115                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
116 }
117 
118 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
119 {
120         if (nla_len(nla) >= sizeof(struct in6_addr)) {
121                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
122                 ip->sa.sa_family = AF_INET6;
123                 return 0;
124         } else if (nla_len(nla) >= sizeof(__be32)) {
125                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
126                 ip->sa.sa_family = AF_INET;
127                 return 0;
128         } else {
129                 return -EAFNOSUPPORT;
130         }
131 }
132 
133 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
134                               const union vxlan_addr *ip)
135 {
136         if (ip->sa.sa_family == AF_INET6)
137                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
138         else
139                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
140 }
141 
142 #else /* !CONFIG_IPV6 */
143 
144 static inline
145 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
146 {
147         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
148 }
149 
150 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
151 {
152         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
153 }
154 
155 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
156 {
157         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
158 }
159 
160 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
161 {
162         if (nla_len(nla) >= sizeof(struct in6_addr)) {
163                 return -EAFNOSUPPORT;
164         } else if (nla_len(nla) >= sizeof(__be32)) {
165                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
166                 ip->sa.sa_family = AF_INET;
167                 return 0;
168         } else {
169                 return -EAFNOSUPPORT;
170         }
171 }
172 
173 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
174                               const union vxlan_addr *ip)
175 {
176         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
177 }
178 #endif
179 
180 /* Virtual Network hash table head */
181 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
182 {
183         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
184 }
185 
186 /* Socket hash table head */
187 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
188 {
189         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
190 
191         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
192 }
193 
194 /* First remote destination for a forwarding entry.
195  * Guaranteed to be non-NULL because remotes are never deleted.
196  */
197 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
198 {
199         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
200 }
201 
202 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
203 {
204         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
205 }
206 
207 /* Find VXLAN socket based on network namespace, address family and UDP port
208  * and enabled unshareable flags.
209  */
210 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
211                                           __be16 port, u32 flags)
212 {
213         struct vxlan_sock *vs;
214 
215         flags &= VXLAN_F_RCV_FLAGS;
216 
217         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
218                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
219                     vxlan_get_sk_family(vs) == family &&
220                     vs->flags == flags)
221                         return vs;
222         }
223         return NULL;
224 }
225 
226 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
227 {
228         struct vxlan_dev *vxlan;
229 
230         /* For flow based devices, map all packets to VNI 0 */
231         if (vs->flags & VXLAN_F_COLLECT_METADATA)
232                 vni = 0;
233 
234         hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
235                 if (vxlan->default_dst.remote_vni == vni)
236                         return vxlan;
237         }
238 
239         return NULL;
240 }
241 
242 /* Look up VNI in a per net namespace table */
243 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
244                                         sa_family_t family, __be16 port,
245                                         u32 flags)
246 {
247         struct vxlan_sock *vs;
248 
249         vs = vxlan_find_sock(net, family, port, flags);
250         if (!vs)
251                 return NULL;
252 
253         return vxlan_vs_find_vni(vs, vni);
254 }
255 
256 /* Fill in neighbour message in skbuff. */
257 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
258                           const struct vxlan_fdb *fdb,
259                           u32 portid, u32 seq, int type, unsigned int flags,
260                           const struct vxlan_rdst *rdst)
261 {
262         unsigned long now = jiffies;
263         struct nda_cacheinfo ci;
264         struct nlmsghdr *nlh;
265         struct ndmsg *ndm;
266         bool send_ip, send_eth;
267 
268         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
269         if (nlh == NULL)
270                 return -EMSGSIZE;
271 
272         ndm = nlmsg_data(nlh);
273         memset(ndm, 0, sizeof(*ndm));
274 
275         send_eth = send_ip = true;
276 
277         if (type == RTM_GETNEIGH) {
278                 ndm->ndm_family = AF_INET;
279                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
280                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
281         } else
282                 ndm->ndm_family = AF_BRIDGE;
283         ndm->ndm_state = fdb->state;
284         ndm->ndm_ifindex = vxlan->dev->ifindex;
285         ndm->ndm_flags = fdb->flags;
286         ndm->ndm_type = RTN_UNICAST;
287 
288         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
289             nla_put_s32(skb, NDA_LINK_NETNSID,
290                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
291                 goto nla_put_failure;
292 
293         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
294                 goto nla_put_failure;
295 
296         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
297                 goto nla_put_failure;
298 
299         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
300             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
301                 goto nla_put_failure;
302         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
303             nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
304                 goto nla_put_failure;
305         if (rdst->remote_ifindex &&
306             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
307                 goto nla_put_failure;
308 
309         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
310         ci.ndm_confirmed = 0;
311         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
312         ci.ndm_refcnt    = 0;
313 
314         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
315                 goto nla_put_failure;
316 
317         nlmsg_end(skb, nlh);
318         return 0;
319 
320 nla_put_failure:
321         nlmsg_cancel(skb, nlh);
322         return -EMSGSIZE;
323 }
324 
325 static inline size_t vxlan_nlmsg_size(void)
326 {
327         return NLMSG_ALIGN(sizeof(struct ndmsg))
328                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
329                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
330                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
331                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
332                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
333                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
334                 + nla_total_size(sizeof(struct nda_cacheinfo));
335 }
336 
337 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
338                              struct vxlan_rdst *rd, int type)
339 {
340         struct net *net = dev_net(vxlan->dev);
341         struct sk_buff *skb;
342         int err = -ENOBUFS;
343 
344         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
345         if (skb == NULL)
346                 goto errout;
347 
348         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
349         if (err < 0) {
350                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
351                 WARN_ON(err == -EMSGSIZE);
352                 kfree_skb(skb);
353                 goto errout;
354         }
355 
356         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
357         return;
358 errout:
359         if (err < 0)
360                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
361 }
362 
363 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
364 {
365         struct vxlan_dev *vxlan = netdev_priv(dev);
366         struct vxlan_fdb f = {
367                 .state = NUD_STALE,
368         };
369         struct vxlan_rdst remote = {
370                 .remote_ip = *ipa, /* goes to NDA_DST */
371                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
372         };
373 
374         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
375 }
376 
377 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
378 {
379         struct vxlan_fdb f = {
380                 .state = NUD_STALE,
381         };
382         struct vxlan_rdst remote = { };
383 
384         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
385 
386         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
387 }
388 
389 /* Hash Ethernet address */
390 static u32 eth_hash(const unsigned char *addr)
391 {
392         u64 value = get_unaligned((u64 *)addr);
393 
394         /* only want 6 bytes */
395 #ifdef __BIG_ENDIAN
396         value >>= 16;
397 #else
398         value <<= 16;
399 #endif
400         return hash_64(value, FDB_HASH_BITS);
401 }
402 
403 /* Hash chain to use given mac address */
404 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
405                                                 const u8 *mac)
406 {
407         return &vxlan->fdb_head[eth_hash(mac)];
408 }
409 
410 /* Look up Ethernet address in forwarding table */
411 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
412                                         const u8 *mac)
413 {
414         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
415         struct vxlan_fdb *f;
416 
417         hlist_for_each_entry_rcu(f, head, hlist) {
418                 if (ether_addr_equal(mac, f->eth_addr))
419                         return f;
420         }
421 
422         return NULL;
423 }
424 
425 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
426                                         const u8 *mac)
427 {
428         struct vxlan_fdb *f;
429 
430         f = __vxlan_find_mac(vxlan, mac);
431         if (f)
432                 f->used = jiffies;
433 
434         return f;
435 }
436 
437 /* caller should hold vxlan->hash_lock */
438 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
439                                               union vxlan_addr *ip, __be16 port,
440                                               __be32 vni, __u32 ifindex)
441 {
442         struct vxlan_rdst *rd;
443 
444         list_for_each_entry(rd, &f->remotes, list) {
445                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
446                     rd->remote_port == port &&
447                     rd->remote_vni == vni &&
448                     rd->remote_ifindex == ifindex)
449                         return rd;
450         }
451 
452         return NULL;
453 }
454 
455 /* Replace destination of unicast mac */
456 static int vxlan_fdb_replace(struct vxlan_fdb *f,
457                              union vxlan_addr *ip, __be16 port, __be32 vni,
458                              __u32 ifindex)
459 {
460         struct vxlan_rdst *rd;
461 
462         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
463         if (rd)
464                 return 0;
465 
466         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
467         if (!rd)
468                 return 0;
469 
470         dst_cache_reset(&rd->dst_cache);
471         rd->remote_ip = *ip;
472         rd->remote_port = port;
473         rd->remote_vni = vni;
474         rd->remote_ifindex = ifindex;
475         return 1;
476 }
477 
478 /* Add/update destinations for multicast */
479 static int vxlan_fdb_append(struct vxlan_fdb *f,
480                             union vxlan_addr *ip, __be16 port, __be32 vni,
481                             __u32 ifindex, struct vxlan_rdst **rdp)
482 {
483         struct vxlan_rdst *rd;
484 
485         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
486         if (rd)
487                 return 0;
488 
489         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
490         if (rd == NULL)
491                 return -ENOBUFS;
492 
493         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
494                 kfree(rd);
495                 return -ENOBUFS;
496         }
497 
498         rd->remote_ip = *ip;
499         rd->remote_port = port;
500         rd->remote_vni = vni;
501         rd->remote_ifindex = ifindex;
502 
503         list_add_tail_rcu(&rd->list, &f->remotes);
504 
505         *rdp = rd;
506         return 1;
507 }
508 
509 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
510                                           unsigned int off,
511                                           struct vxlanhdr *vh, size_t hdrlen,
512                                           __be32 vni_field,
513                                           struct gro_remcsum *grc,
514                                           bool nopartial)
515 {
516         size_t start, offset;
517 
518         if (skb->remcsum_offload)
519                 return vh;
520 
521         if (!NAPI_GRO_CB(skb)->csum_valid)
522                 return NULL;
523 
524         start = vxlan_rco_start(vni_field);
525         offset = start + vxlan_rco_offset(vni_field);
526 
527         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
528                                      start, offset, grc, nopartial);
529 
530         skb->remcsum_offload = 1;
531 
532         return vh;
533 }
534 
535 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
536                                           struct sk_buff **head,
537                                           struct sk_buff *skb)
538 {
539         struct sk_buff *p, **pp = NULL;
540         struct vxlanhdr *vh, *vh2;
541         unsigned int hlen, off_vx;
542         int flush = 1;
543         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
544         __be32 flags;
545         struct gro_remcsum grc;
546 
547         skb_gro_remcsum_init(&grc);
548 
549         off_vx = skb_gro_offset(skb);
550         hlen = off_vx + sizeof(*vh);
551         vh   = skb_gro_header_fast(skb, off_vx);
552         if (skb_gro_header_hard(skb, hlen)) {
553                 vh = skb_gro_header_slow(skb, hlen, off_vx);
554                 if (unlikely(!vh))
555                         goto out;
556         }
557 
558         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
559 
560         flags = vh->vx_flags;
561 
562         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
563                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
564                                        vh->vx_vni, &grc,
565                                        !!(vs->flags &
566                                           VXLAN_F_REMCSUM_NOPARTIAL));
567 
568                 if (!vh)
569                         goto out;
570         }
571 
572         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
573 
574         for (p = *head; p; p = p->next) {
575                 if (!NAPI_GRO_CB(p)->same_flow)
576                         continue;
577 
578                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
579                 if (vh->vx_flags != vh2->vx_flags ||
580                     vh->vx_vni != vh2->vx_vni) {
581                         NAPI_GRO_CB(p)->same_flow = 0;
582                         continue;
583                 }
584         }
585 
586         pp = call_gro_receive(eth_gro_receive, head, skb);
587         flush = 0;
588 
589 out:
590         skb_gro_remcsum_cleanup(skb, &grc);
591         NAPI_GRO_CB(skb)->flush |= flush;
592 
593         return pp;
594 }
595 
596 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
597 {
598         /* Sets 'skb->inner_mac_header' since we are always called with
599          * 'skb->encapsulation' set.
600          */
601         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
602 }
603 
604 /* Add new entry to forwarding table -- assumes lock held */
605 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
606                             const u8 *mac, union vxlan_addr *ip,
607                             __u16 state, __u16 flags,
608                             __be16 port, __be32 vni, __u32 ifindex,
609                             __u8 ndm_flags)
610 {
611         struct vxlan_rdst *rd = NULL;
612         struct vxlan_fdb *f;
613         int notify = 0;
614         int rc;
615 
616         f = __vxlan_find_mac(vxlan, mac);
617         if (f) {
618                 if (flags & NLM_F_EXCL) {
619                         netdev_dbg(vxlan->dev,
620                                    "lost race to create %pM\n", mac);
621                         return -EEXIST;
622                 }
623                 if (f->state != state) {
624                         f->state = state;
625                         f->updated = jiffies;
626                         notify = 1;
627                 }
628                 if (f->flags != ndm_flags) {
629                         f->flags = ndm_flags;
630                         f->updated = jiffies;
631                         notify = 1;
632                 }
633                 if ((flags & NLM_F_REPLACE)) {
634                         /* Only change unicasts */
635                         if (!(is_multicast_ether_addr(f->eth_addr) ||
636                              is_zero_ether_addr(f->eth_addr))) {
637                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
638                                                            ifindex);
639                         } else
640                                 return -EOPNOTSUPP;
641                 }
642                 if ((flags & NLM_F_APPEND) &&
643                     (is_multicast_ether_addr(f->eth_addr) ||
644                      is_zero_ether_addr(f->eth_addr))) {
645                         rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
646 
647                         if (rc < 0)
648                                 return rc;
649                         notify |= rc;
650                 }
651         } else {
652                 if (!(flags & NLM_F_CREATE))
653                         return -ENOENT;
654 
655                 if (vxlan->cfg.addrmax &&
656                     vxlan->addrcnt >= vxlan->cfg.addrmax)
657                         return -ENOSPC;
658 
659                 /* Disallow replace to add a multicast entry */
660                 if ((flags & NLM_F_REPLACE) &&
661                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
662                         return -EOPNOTSUPP;
663 
664                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
665                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
666                 if (!f)
667                         return -ENOMEM;
668 
669                 notify = 1;
670                 f->state = state;
671                 f->flags = ndm_flags;
672                 f->updated = f->used = jiffies;
673                 INIT_LIST_HEAD(&f->remotes);
674                 memcpy(f->eth_addr, mac, ETH_ALEN);
675 
676                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
677                 if (rc < 0) {
678                         kfree(f);
679                         return rc;
680                 }
681 
682                 ++vxlan->addrcnt;
683                 hlist_add_head_rcu(&f->hlist,
684                                    vxlan_fdb_head(vxlan, mac));
685         }
686 
687         if (notify) {
688                 if (rd == NULL)
689                         rd = first_remote_rtnl(f);
690                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
691         }
692 
693         return 0;
694 }
695 
696 static void vxlan_fdb_free(struct rcu_head *head)
697 {
698         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
699         struct vxlan_rdst *rd, *nd;
700 
701         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
702                 dst_cache_destroy(&rd->dst_cache);
703                 kfree(rd);
704         }
705         kfree(f);
706 }
707 
708 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
709 {
710         netdev_dbg(vxlan->dev,
711                     "delete %pM\n", f->eth_addr);
712 
713         --vxlan->addrcnt;
714         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
715 
716         hlist_del_rcu(&f->hlist);
717         call_rcu(&f->rcu, vxlan_fdb_free);
718 }
719 
720 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
721                            union vxlan_addr *ip, __be16 *port, __be32 *vni,
722                            u32 *ifindex)
723 {
724         struct net *net = dev_net(vxlan->dev);
725         int err;
726 
727         if (tb[NDA_DST]) {
728                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
729                 if (err)
730                         return err;
731         } else {
732                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
733                 if (remote->sa.sa_family == AF_INET) {
734                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
735                         ip->sa.sa_family = AF_INET;
736 #if IS_ENABLED(CONFIG_IPV6)
737                 } else {
738                         ip->sin6.sin6_addr = in6addr_any;
739                         ip->sa.sa_family = AF_INET6;
740 #endif
741                 }
742         }
743 
744         if (tb[NDA_PORT]) {
745                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
746                         return -EINVAL;
747                 *port = nla_get_be16(tb[NDA_PORT]);
748         } else {
749                 *port = vxlan->cfg.dst_port;
750         }
751 
752         if (tb[NDA_VNI]) {
753                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
754                         return -EINVAL;
755                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
756         } else {
757                 *vni = vxlan->default_dst.remote_vni;
758         }
759 
760         if (tb[NDA_IFINDEX]) {
761                 struct net_device *tdev;
762 
763                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
764                         return -EINVAL;
765                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
766                 tdev = __dev_get_by_index(net, *ifindex);
767                 if (!tdev)
768                         return -EADDRNOTAVAIL;
769         } else {
770                 *ifindex = 0;
771         }
772 
773         return 0;
774 }
775 
776 /* Add static entry (via netlink) */
777 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
778                          struct net_device *dev,
779                          const unsigned char *addr, u16 vid, u16 flags)
780 {
781         struct vxlan_dev *vxlan = netdev_priv(dev);
782         /* struct net *net = dev_net(vxlan->dev); */
783         union vxlan_addr ip;
784         __be16 port;
785         __be32 vni;
786         u32 ifindex;
787         int err;
788 
789         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
790                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
791                         ndm->ndm_state);
792                 return -EINVAL;
793         }
794 
795         if (tb[NDA_DST] == NULL)
796                 return -EINVAL;
797 
798         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
799         if (err)
800                 return err;
801 
802         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
803                 return -EAFNOSUPPORT;
804 
805         spin_lock_bh(&vxlan->hash_lock);
806         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
807                                port, vni, ifindex, ndm->ndm_flags);
808         spin_unlock_bh(&vxlan->hash_lock);
809 
810         return err;
811 }
812 
813 /* Delete entry (via netlink) */
814 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
815                             struct net_device *dev,
816                             const unsigned char *addr, u16 vid)
817 {
818         struct vxlan_dev *vxlan = netdev_priv(dev);
819         struct vxlan_fdb *f;
820         struct vxlan_rdst *rd = NULL;
821         union vxlan_addr ip;
822         __be16 port;
823         __be32 vni;
824         u32 ifindex;
825         int err;
826 
827         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
828         if (err)
829                 return err;
830 
831         err = -ENOENT;
832 
833         spin_lock_bh(&vxlan->hash_lock);
834         f = vxlan_find_mac(vxlan, addr);
835         if (!f)
836                 goto out;
837 
838         if (!vxlan_addr_any(&ip)) {
839                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
840                 if (!rd)
841                         goto out;
842         }
843 
844         err = 0;
845 
846         /* remove a destination if it's not the only one on the list,
847          * otherwise destroy the fdb entry
848          */
849         if (rd && !list_is_singular(&f->remotes)) {
850                 list_del_rcu(&rd->list);
851                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
852                 kfree_rcu(rd, rcu);
853                 goto out;
854         }
855 
856         vxlan_fdb_destroy(vxlan, f);
857 
858 out:
859         spin_unlock_bh(&vxlan->hash_lock);
860 
861         return err;
862 }
863 
864 /* Dump forwarding table */
865 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
866                           struct net_device *dev,
867                           struct net_device *filter_dev, int *idx)
868 {
869         struct vxlan_dev *vxlan = netdev_priv(dev);
870         unsigned int h;
871         int err = 0;
872 
873         for (h = 0; h < FDB_HASH_SIZE; ++h) {
874                 struct vxlan_fdb *f;
875 
876                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
877                         struct vxlan_rdst *rd;
878 
879                         list_for_each_entry_rcu(rd, &f->remotes, list) {
880                                 if (*idx < cb->args[2])
881                                         goto skip;
882 
883                                 err = vxlan_fdb_info(skb, vxlan, f,
884                                                      NETLINK_CB(cb->skb).portid,
885                                                      cb->nlh->nlmsg_seq,
886                                                      RTM_NEWNEIGH,
887                                                      NLM_F_MULTI, rd);
888                                 if (err < 0)
889                                         goto out;
890 skip:
891                                 *idx += 1;
892                         }
893                 }
894         }
895 out:
896         return err;
897 }
898 
899 /* Watch incoming packets to learn mapping between Ethernet address
900  * and Tunnel endpoint.
901  * Return true if packet is bogus and should be dropped.
902  */
903 static bool vxlan_snoop(struct net_device *dev,
904                         union vxlan_addr *src_ip, const u8 *src_mac)
905 {
906         struct vxlan_dev *vxlan = netdev_priv(dev);
907         struct vxlan_fdb *f;
908 
909         f = vxlan_find_mac(vxlan, src_mac);
910         if (likely(f)) {
911                 struct vxlan_rdst *rdst = first_remote_rcu(f);
912 
913                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
914                         return false;
915 
916                 /* Don't migrate static entries, drop packets */
917                 if (f->state & NUD_NOARP)
918                         return true;
919 
920                 if (net_ratelimit())
921                         netdev_info(dev,
922                                     "%pM migrated from %pIS to %pIS\n",
923                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
924 
925                 rdst->remote_ip = *src_ip;
926                 f->updated = jiffies;
927                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
928         } else {
929                 /* learned new entry */
930                 spin_lock(&vxlan->hash_lock);
931 
932                 /* close off race between vxlan_flush and incoming packets */
933                 if (netif_running(dev))
934                         vxlan_fdb_create(vxlan, src_mac, src_ip,
935                                          NUD_REACHABLE,
936                                          NLM_F_EXCL|NLM_F_CREATE,
937                                          vxlan->cfg.dst_port,
938                                          vxlan->default_dst.remote_vni,
939                                          0, NTF_SELF);
940                 spin_unlock(&vxlan->hash_lock);
941         }
942 
943         return false;
944 }
945 
946 /* See if multicast group is already in use by other ID */
947 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
948 {
949         struct vxlan_dev *vxlan;
950         struct vxlan_sock *sock4;
951 #if IS_ENABLED(CONFIG_IPV6)
952         struct vxlan_sock *sock6;
953 #endif
954         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
955 
956         sock4 = rtnl_dereference(dev->vn4_sock);
957 
958         /* The vxlan_sock is only used by dev, leaving group has
959          * no effect on other vxlan devices.
960          */
961         if (family == AF_INET && sock4 && atomic_read(&sock4->refcnt) == 1)
962                 return false;
963 #if IS_ENABLED(CONFIG_IPV6)
964         sock6 = rtnl_dereference(dev->vn6_sock);
965         if (family == AF_INET6 && sock6 && atomic_read(&sock6->refcnt) == 1)
966                 return false;
967 #endif
968 
969         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
970                 if (!netif_running(vxlan->dev) || vxlan == dev)
971                         continue;
972 
973                 if (family == AF_INET &&
974                     rtnl_dereference(vxlan->vn4_sock) != sock4)
975                         continue;
976 #if IS_ENABLED(CONFIG_IPV6)
977                 if (family == AF_INET6 &&
978                     rtnl_dereference(vxlan->vn6_sock) != sock6)
979                         continue;
980 #endif
981 
982                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
983                                       &dev->default_dst.remote_ip))
984                         continue;
985 
986                 if (vxlan->default_dst.remote_ifindex !=
987                     dev->default_dst.remote_ifindex)
988                         continue;
989 
990                 return true;
991         }
992 
993         return false;
994 }
995 
996 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
997 {
998         struct vxlan_net *vn;
999 
1000         if (!vs)
1001                 return false;
1002         if (!atomic_dec_and_test(&vs->refcnt))
1003                 return false;
1004 
1005         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1006         spin_lock(&vn->sock_lock);
1007         hlist_del_rcu(&vs->hlist);
1008         udp_tunnel_notify_del_rx_port(vs->sock,
1009                                       (vs->flags & VXLAN_F_GPE) ?
1010                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
1011                                       UDP_TUNNEL_TYPE_VXLAN);
1012         spin_unlock(&vn->sock_lock);
1013 
1014         return true;
1015 }
1016 
1017 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1018 {
1019         struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1020 #if IS_ENABLED(CONFIG_IPV6)
1021         struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1022 
1023         rcu_assign_pointer(vxlan->vn6_sock, NULL);
1024 #endif
1025 
1026         rcu_assign_pointer(vxlan->vn4_sock, NULL);
1027         synchronize_net();
1028 
1029         if (__vxlan_sock_release_prep(sock4)) {
1030                 udp_tunnel_sock_release(sock4->sock);
1031                 kfree(sock4);
1032         }
1033 
1034 #if IS_ENABLED(CONFIG_IPV6)
1035         if (__vxlan_sock_release_prep(sock6)) {
1036                 udp_tunnel_sock_release(sock6->sock);
1037                 kfree(sock6);
1038         }
1039 #endif
1040 }
1041 
1042 /* Update multicast group membership when first VNI on
1043  * multicast address is brought up
1044  */
1045 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1046 {
1047         struct sock *sk;
1048         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1049         int ifindex = vxlan->default_dst.remote_ifindex;
1050         int ret = -EINVAL;
1051 
1052         if (ip->sa.sa_family == AF_INET) {
1053                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1054                 struct ip_mreqn mreq = {
1055                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1056                         .imr_ifindex            = ifindex,
1057                 };
1058 
1059                 sk = sock4->sock->sk;
1060                 lock_sock(sk);
1061                 ret = ip_mc_join_group(sk, &mreq);
1062                 release_sock(sk);
1063 #if IS_ENABLED(CONFIG_IPV6)
1064         } else {
1065                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1066 
1067                 sk = sock6->sock->sk;
1068                 lock_sock(sk);
1069                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1070                                                    &ip->sin6.sin6_addr);
1071                 release_sock(sk);
1072 #endif
1073         }
1074 
1075         return ret;
1076 }
1077 
1078 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1079 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1080 {
1081         struct sock *sk;
1082         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1083         int ifindex = vxlan->default_dst.remote_ifindex;
1084         int ret = -EINVAL;
1085 
1086         if (ip->sa.sa_family == AF_INET) {
1087                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1088                 struct ip_mreqn mreq = {
1089                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1090                         .imr_ifindex            = ifindex,
1091                 };
1092 
1093                 sk = sock4->sock->sk;
1094                 lock_sock(sk);
1095                 ret = ip_mc_leave_group(sk, &mreq);
1096                 release_sock(sk);
1097 #if IS_ENABLED(CONFIG_IPV6)
1098         } else {
1099                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1100 
1101                 sk = sock6->sock->sk;
1102                 lock_sock(sk);
1103                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1104                                                    &ip->sin6.sin6_addr);
1105                 release_sock(sk);
1106 #endif
1107         }
1108 
1109         return ret;
1110 }
1111 
1112 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1113                           struct sk_buff *skb, u32 vxflags)
1114 {
1115         size_t start, offset;
1116 
1117         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1118                 goto out;
1119 
1120         start = vxlan_rco_start(unparsed->vx_vni);
1121         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1122 
1123         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1124                 return false;
1125 
1126         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1127                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1128 out:
1129         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1130         unparsed->vx_vni &= VXLAN_VNI_MASK;
1131         return true;
1132 }
1133 
1134 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1135                                 struct sk_buff *skb, u32 vxflags,
1136                                 struct vxlan_metadata *md)
1137 {
1138         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1139         struct metadata_dst *tun_dst;
1140 
1141         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1142                 goto out;
1143 
1144         md->gbp = ntohs(gbp->policy_id);
1145 
1146         tun_dst = (struct metadata_dst *)skb_dst(skb);
1147         if (tun_dst) {
1148                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1149                 tun_dst->u.tun_info.options_len = sizeof(*md);
1150         }
1151         if (gbp->dont_learn)
1152                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1153 
1154         if (gbp->policy_applied)
1155                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1156 
1157         /* In flow-based mode, GBP is carried in dst_metadata */
1158         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1159                 skb->mark = md->gbp;
1160 out:
1161         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1162 }
1163 
1164 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1165                                 __be16 *protocol,
1166                                 struct sk_buff *skb, u32 vxflags)
1167 {
1168         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1169 
1170         /* Need to have Next Protocol set for interfaces in GPE mode. */
1171         if (!gpe->np_applied)
1172                 return false;
1173         /* "The initial version is 0. If a receiver does not support the
1174          * version indicated it MUST drop the packet.
1175          */
1176         if (gpe->version != 0)
1177                 return false;
1178         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1179          * processing MUST occur." However, we don't implement OAM
1180          * processing, thus drop the packet.
1181          */
1182         if (gpe->oam_flag)
1183                 return false;
1184 
1185         switch (gpe->next_protocol) {
1186         case VXLAN_GPE_NP_IPV4:
1187                 *protocol = htons(ETH_P_IP);
1188                 break;
1189         case VXLAN_GPE_NP_IPV6:
1190                 *protocol = htons(ETH_P_IPV6);
1191                 break;
1192         case VXLAN_GPE_NP_ETHERNET:
1193                 *protocol = htons(ETH_P_TEB);
1194                 break;
1195         default:
1196                 return false;
1197         }
1198 
1199         unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1200         return true;
1201 }
1202 
1203 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1204                           struct vxlan_sock *vs,
1205                           struct sk_buff *skb)
1206 {
1207         union vxlan_addr saddr;
1208 
1209         skb_reset_mac_header(skb);
1210         skb->protocol = eth_type_trans(skb, vxlan->dev);
1211         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1212 
1213         /* Ignore packet loops (and multicast echo) */
1214         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1215                 return false;
1216 
1217         /* Get address from the outer IP header */
1218         if (vxlan_get_sk_family(vs) == AF_INET) {
1219                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1220                 saddr.sa.sa_family = AF_INET;
1221 #if IS_ENABLED(CONFIG_IPV6)
1222         } else {
1223                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1224                 saddr.sa.sa_family = AF_INET6;
1225 #endif
1226         }
1227 
1228         if ((vxlan->flags & VXLAN_F_LEARN) &&
1229             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1230                 return false;
1231 
1232         return true;
1233 }
1234 
1235 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1236                                   struct sk_buff *skb)
1237 {
1238         int err = 0;
1239 
1240         if (vxlan_get_sk_family(vs) == AF_INET)
1241                 err = IP_ECN_decapsulate(oiph, skb);
1242 #if IS_ENABLED(CONFIG_IPV6)
1243         else
1244                 err = IP6_ECN_decapsulate(oiph, skb);
1245 #endif
1246 
1247         if (unlikely(err) && log_ecn_error) {
1248                 if (vxlan_get_sk_family(vs) == AF_INET)
1249                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1250                                              &((struct iphdr *)oiph)->saddr,
1251                                              ((struct iphdr *)oiph)->tos);
1252                 else
1253                         net_info_ratelimited("non-ECT from %pI6\n",
1254                                              &((struct ipv6hdr *)oiph)->saddr);
1255         }
1256         return err <= 1;
1257 }
1258 
1259 /* Callback from net/ipv4/udp.c to receive packets */
1260 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1261 {
1262         struct pcpu_sw_netstats *stats;
1263         struct vxlan_dev *vxlan;
1264         struct vxlan_sock *vs;
1265         struct vxlanhdr unparsed;
1266         struct vxlan_metadata _md;
1267         struct vxlan_metadata *md = &_md;
1268         __be16 protocol = htons(ETH_P_TEB);
1269         bool raw_proto = false;
1270         void *oiph;
1271 
1272         /* Need UDP and VXLAN header to be present */
1273         if (!pskb_may_pull(skb, VXLAN_HLEN))
1274                 goto drop;
1275 
1276         unparsed = *vxlan_hdr(skb);
1277         /* VNI flag always required to be set */
1278         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1279                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1280                            ntohl(vxlan_hdr(skb)->vx_flags),
1281                            ntohl(vxlan_hdr(skb)->vx_vni));
1282                 /* Return non vxlan pkt */
1283                 goto drop;
1284         }
1285         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1286         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1287 
1288         vs = rcu_dereference_sk_user_data(sk);
1289         if (!vs)
1290                 goto drop;
1291 
1292         vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1293         if (!vxlan)
1294                 goto drop;
1295 
1296         /* For backwards compatibility, only allow reserved fields to be
1297          * used by VXLAN extensions if explicitly requested.
1298          */
1299         if (vs->flags & VXLAN_F_GPE) {
1300                 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1301                         goto drop;
1302                 raw_proto = true;
1303         }
1304 
1305         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1306                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1307                         goto drop;
1308 
1309         if (vxlan_collect_metadata(vs)) {
1310                 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1311                 struct metadata_dst *tun_dst;
1312 
1313                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1314                                          key32_to_tunnel_id(vni), sizeof(*md));
1315 
1316                 if (!tun_dst)
1317                         goto drop;
1318 
1319                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1320 
1321                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1322         } else {
1323                 memset(md, 0, sizeof(*md));
1324         }
1325 
1326         if (vs->flags & VXLAN_F_REMCSUM_RX)
1327                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1328                         goto drop;
1329         if (vs->flags & VXLAN_F_GBP)
1330                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1331         /* Note that GBP and GPE can never be active together. This is
1332          * ensured in vxlan_dev_configure.
1333          */
1334 
1335         if (unparsed.vx_flags || unparsed.vx_vni) {
1336                 /* If there are any unprocessed flags remaining treat
1337                  * this as a malformed packet. This behavior diverges from
1338                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1339                  * in reserved fields are to be ignored. The approach here
1340                  * maintains compatibility with previous stack code, and also
1341                  * is more robust and provides a little more security in
1342                  * adding extensions to VXLAN.
1343                  */
1344                 goto drop;
1345         }
1346 
1347         if (!raw_proto) {
1348                 if (!vxlan_set_mac(vxlan, vs, skb))
1349                         goto drop;
1350         } else {
1351                 skb_reset_mac_header(skb);
1352                 skb->dev = vxlan->dev;
1353                 skb->pkt_type = PACKET_HOST;
1354         }
1355 
1356         oiph = skb_network_header(skb);
1357         skb_reset_network_header(skb);
1358 
1359         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1360                 ++vxlan->dev->stats.rx_frame_errors;
1361                 ++vxlan->dev->stats.rx_errors;
1362                 goto drop;
1363         }
1364 
1365         stats = this_cpu_ptr(vxlan->dev->tstats);
1366         u64_stats_update_begin(&stats->syncp);
1367         stats->rx_packets++;
1368         stats->rx_bytes += skb->len;
1369         u64_stats_update_end(&stats->syncp);
1370 
1371         gro_cells_receive(&vxlan->gro_cells, skb);
1372         return 0;
1373 
1374 drop:
1375         /* Consume bad packet */
1376         kfree_skb(skb);
1377         return 0;
1378 }
1379 
1380 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1381 {
1382         struct vxlan_dev *vxlan = netdev_priv(dev);
1383         struct arphdr *parp;
1384         u8 *arpptr, *sha;
1385         __be32 sip, tip;
1386         struct neighbour *n;
1387 
1388         if (dev->flags & IFF_NOARP)
1389                 goto out;
1390 
1391         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1392                 dev->stats.tx_dropped++;
1393                 goto out;
1394         }
1395         parp = arp_hdr(skb);
1396 
1397         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1398              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1399             parp->ar_pro != htons(ETH_P_IP) ||
1400             parp->ar_op != htons(ARPOP_REQUEST) ||
1401             parp->ar_hln != dev->addr_len ||
1402             parp->ar_pln != 4)
1403                 goto out;
1404         arpptr = (u8 *)parp + sizeof(struct arphdr);
1405         sha = arpptr;
1406         arpptr += dev->addr_len;        /* sha */
1407         memcpy(&sip, arpptr, sizeof(sip));
1408         arpptr += sizeof(sip);
1409         arpptr += dev->addr_len;        /* tha */
1410         memcpy(&tip, arpptr, sizeof(tip));
1411 
1412         if (ipv4_is_loopback(tip) ||
1413             ipv4_is_multicast(tip))
1414                 goto out;
1415 
1416         n = neigh_lookup(&arp_tbl, &tip, dev);
1417 
1418         if (n) {
1419                 struct vxlan_fdb *f;
1420                 struct sk_buff  *reply;
1421 
1422                 if (!(n->nud_state & NUD_CONNECTED)) {
1423                         neigh_release(n);
1424                         goto out;
1425                 }
1426 
1427                 f = vxlan_find_mac(vxlan, n->ha);
1428                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1429                         /* bridge-local neighbor */
1430                         neigh_release(n);
1431                         goto out;
1432                 }
1433 
1434                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1435                                 n->ha, sha);
1436 
1437                 neigh_release(n);
1438 
1439                 if (reply == NULL)
1440                         goto out;
1441 
1442                 skb_reset_mac_header(reply);
1443                 __skb_pull(reply, skb_network_offset(reply));
1444                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1445                 reply->pkt_type = PACKET_HOST;
1446 
1447                 if (netif_rx_ni(reply) == NET_RX_DROP)
1448                         dev->stats.rx_dropped++;
1449         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1450                 union vxlan_addr ipa = {
1451                         .sin.sin_addr.s_addr = tip,
1452                         .sin.sin_family = AF_INET,
1453                 };
1454 
1455                 vxlan_ip_miss(dev, &ipa);
1456         }
1457 out:
1458         consume_skb(skb);
1459         return NETDEV_TX_OK;
1460 }
1461 
1462 #if IS_ENABLED(CONFIG_IPV6)
1463 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1464         struct neighbour *n, bool isrouter)
1465 {
1466         struct net_device *dev = request->dev;
1467         struct sk_buff *reply;
1468         struct nd_msg *ns, *na;
1469         struct ipv6hdr *pip6;
1470         u8 *daddr;
1471         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1472         int ns_olen;
1473         int i, len;
1474 
1475         if (dev == NULL)
1476                 return NULL;
1477 
1478         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1479                 sizeof(*na) + na_olen + dev->needed_tailroom;
1480         reply = alloc_skb(len, GFP_ATOMIC);
1481         if (reply == NULL)
1482                 return NULL;
1483 
1484         reply->protocol = htons(ETH_P_IPV6);
1485         reply->dev = dev;
1486         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1487         skb_push(reply, sizeof(struct ethhdr));
1488         skb_reset_mac_header(reply);
1489 
1490         ns = (struct nd_msg *)skb_transport_header(request);
1491 
1492         daddr = eth_hdr(request)->h_source;
1493         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1494         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1495                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1496                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1497                         break;
1498                 }
1499         }
1500 
1501         /* Ethernet header */
1502         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1503         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1504         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1505         reply->protocol = htons(ETH_P_IPV6);
1506 
1507         skb_pull(reply, sizeof(struct ethhdr));
1508         skb_reset_network_header(reply);
1509         skb_put(reply, sizeof(struct ipv6hdr));
1510 
1511         /* IPv6 header */
1512 
1513         pip6 = ipv6_hdr(reply);
1514         memset(pip6, 0, sizeof(struct ipv6hdr));
1515         pip6->version = 6;
1516         pip6->priority = ipv6_hdr(request)->priority;
1517         pip6->nexthdr = IPPROTO_ICMPV6;
1518         pip6->hop_limit = 255;
1519         pip6->daddr = ipv6_hdr(request)->saddr;
1520         pip6->saddr = *(struct in6_addr *)n->primary_key;
1521 
1522         skb_pull(reply, sizeof(struct ipv6hdr));
1523         skb_reset_transport_header(reply);
1524 
1525         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1526 
1527         /* Neighbor Advertisement */
1528         memset(na, 0, sizeof(*na)+na_olen);
1529         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1530         na->icmph.icmp6_router = isrouter;
1531         na->icmph.icmp6_override = 1;
1532         na->icmph.icmp6_solicited = 1;
1533         na->target = ns->target;
1534         ether_addr_copy(&na->opt[2], n->ha);
1535         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1536         na->opt[1] = na_olen >> 3;
1537 
1538         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1539                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1540                 csum_partial(na, sizeof(*na)+na_olen, 0));
1541 
1542         pip6->payload_len = htons(sizeof(*na)+na_olen);
1543 
1544         skb_push(reply, sizeof(struct ipv6hdr));
1545 
1546         reply->ip_summed = CHECKSUM_UNNECESSARY;
1547 
1548         return reply;
1549 }
1550 
1551 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1552 {
1553         struct vxlan_dev *vxlan = netdev_priv(dev);
1554         struct nd_msg *msg;
1555         const struct ipv6hdr *iphdr;
1556         const struct in6_addr *saddr, *daddr;
1557         struct neighbour *n;
1558         struct inet6_dev *in6_dev;
1559 
1560         in6_dev = __in6_dev_get(dev);
1561         if (!in6_dev)
1562                 goto out;
1563 
1564         iphdr = ipv6_hdr(skb);
1565         saddr = &iphdr->saddr;
1566         daddr = &iphdr->daddr;
1567 
1568         msg = (struct nd_msg *)skb_transport_header(skb);
1569         if (msg->icmph.icmp6_code != 0 ||
1570             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1571                 goto out;
1572 
1573         if (ipv6_addr_loopback(daddr) ||
1574             ipv6_addr_is_multicast(&msg->target))
1575                 goto out;
1576 
1577         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1578 
1579         if (n) {
1580                 struct vxlan_fdb *f;
1581                 struct sk_buff *reply;
1582 
1583                 if (!(n->nud_state & NUD_CONNECTED)) {
1584                         neigh_release(n);
1585                         goto out;
1586                 }
1587 
1588                 f = vxlan_find_mac(vxlan, n->ha);
1589                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1590                         /* bridge-local neighbor */
1591                         neigh_release(n);
1592                         goto out;
1593                 }
1594 
1595                 reply = vxlan_na_create(skb, n,
1596                                         !!(f ? f->flags & NTF_ROUTER : 0));
1597 
1598                 neigh_release(n);
1599 
1600                 if (reply == NULL)
1601                         goto out;
1602 
1603                 if (netif_rx_ni(reply) == NET_RX_DROP)
1604                         dev->stats.rx_dropped++;
1605 
1606         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1607                 union vxlan_addr ipa = {
1608                         .sin6.sin6_addr = msg->target,
1609                         .sin6.sin6_family = AF_INET6,
1610                 };
1611 
1612                 vxlan_ip_miss(dev, &ipa);
1613         }
1614 
1615 out:
1616         consume_skb(skb);
1617         return NETDEV_TX_OK;
1618 }
1619 #endif
1620 
1621 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1622 {
1623         struct vxlan_dev *vxlan = netdev_priv(dev);
1624         struct neighbour *n;
1625 
1626         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1627                 return false;
1628 
1629         n = NULL;
1630         switch (ntohs(eth_hdr(skb)->h_proto)) {
1631         case ETH_P_IP:
1632         {
1633                 struct iphdr *pip;
1634 
1635                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1636                         return false;
1637                 pip = ip_hdr(skb);
1638                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1639                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1640                         union vxlan_addr ipa = {
1641                                 .sin.sin_addr.s_addr = pip->daddr,
1642                                 .sin.sin_family = AF_INET,
1643                         };
1644 
1645                         vxlan_ip_miss(dev, &ipa);
1646                         return false;
1647                 }
1648 
1649                 break;
1650         }
1651 #if IS_ENABLED(CONFIG_IPV6)
1652         case ETH_P_IPV6:
1653         {
1654                 struct ipv6hdr *pip6;
1655 
1656                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1657                         return false;
1658                 pip6 = ipv6_hdr(skb);
1659                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1660                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1661                         union vxlan_addr ipa = {
1662                                 .sin6.sin6_addr = pip6->daddr,
1663                                 .sin6.sin6_family = AF_INET6,
1664                         };
1665 
1666                         vxlan_ip_miss(dev, &ipa);
1667                         return false;
1668                 }
1669 
1670                 break;
1671         }
1672 #endif
1673         default:
1674                 return false;
1675         }
1676 
1677         if (n) {
1678                 bool diff;
1679 
1680                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1681                 if (diff) {
1682                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1683                                 dev->addr_len);
1684                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1685                 }
1686                 neigh_release(n);
1687                 return diff;
1688         }
1689 
1690         return false;
1691 }
1692 
1693 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1694                                 struct vxlan_metadata *md)
1695 {
1696         struct vxlanhdr_gbp *gbp;
1697 
1698         if (!md->gbp)
1699                 return;
1700 
1701         gbp = (struct vxlanhdr_gbp *)vxh;
1702         vxh->vx_flags |= VXLAN_HF_GBP;
1703 
1704         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1705                 gbp->dont_learn = 1;
1706 
1707         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1708                 gbp->policy_applied = 1;
1709 
1710         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1711 }
1712 
1713 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1714                                __be16 protocol)
1715 {
1716         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1717 
1718         gpe->np_applied = 1;
1719 
1720         switch (protocol) {
1721         case htons(ETH_P_IP):
1722                 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1723                 return 0;
1724         case htons(ETH_P_IPV6):
1725                 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1726                 return 0;
1727         case htons(ETH_P_TEB):
1728                 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1729                 return 0;
1730         }
1731         return -EPFNOSUPPORT;
1732 }
1733 
1734 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1735                            int iphdr_len, __be32 vni,
1736                            struct vxlan_metadata *md, u32 vxflags,
1737                            bool udp_sum)
1738 {
1739         struct vxlanhdr *vxh;
1740         int min_headroom;
1741         int err;
1742         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1743         __be16 inner_protocol = htons(ETH_P_TEB);
1744 
1745         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1746             skb->ip_summed == CHECKSUM_PARTIAL) {
1747                 int csum_start = skb_checksum_start_offset(skb);
1748 
1749                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1750                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1751                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1752                      skb->csum_offset == offsetof(struct tcphdr, check)))
1753                         type |= SKB_GSO_TUNNEL_REMCSUM;
1754         }
1755 
1756         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1757                         + VXLAN_HLEN + iphdr_len;
1758 
1759         /* Need space for new headers (invalidates iph ptr) */
1760         err = skb_cow_head(skb, min_headroom);
1761         if (unlikely(err))
1762                 return err;
1763 
1764         err = iptunnel_handle_offloads(skb, type);
1765         if (err)
1766                 return err;
1767 
1768         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1769         vxh->vx_flags = VXLAN_HF_VNI;
1770         vxh->vx_vni = vxlan_vni_field(vni);
1771 
1772         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1773                 unsigned int start;
1774 
1775                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1776                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1777                 vxh->vx_flags |= VXLAN_HF_RCO;
1778 
1779                 if (!skb_is_gso(skb)) {
1780                         skb->ip_summed = CHECKSUM_NONE;
1781                         skb->encapsulation = 0;
1782                 }
1783         }
1784 
1785         if (vxflags & VXLAN_F_GBP)
1786                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1787         if (vxflags & VXLAN_F_GPE) {
1788                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1789                 if (err < 0)
1790                         return err;
1791                 inner_protocol = skb->protocol;
1792         }
1793 
1794         skb_set_inner_protocol(skb, inner_protocol);
1795         return 0;
1796 }
1797 
1798 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1799                                       struct vxlan_sock *sock4,
1800                                       struct sk_buff *skb, int oif, u8 tos,
1801                                       __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1802                                       struct dst_cache *dst_cache,
1803                                       const struct ip_tunnel_info *info)
1804 {
1805         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1806         struct rtable *rt = NULL;
1807         struct flowi4 fl4;
1808 
1809         if (!sock4)
1810                 return ERR_PTR(-EIO);
1811 
1812         if (tos && !info)
1813                 use_cache = false;
1814         if (use_cache) {
1815                 rt = dst_cache_get_ip4(dst_cache, saddr);
1816                 if (rt)
1817                         return rt;
1818         }
1819 
1820         memset(&fl4, 0, sizeof(fl4));
1821         fl4.flowi4_oif = oif;
1822         fl4.flowi4_tos = RT_TOS(tos);
1823         fl4.flowi4_mark = skb->mark;
1824         fl4.flowi4_proto = IPPROTO_UDP;
1825         fl4.daddr = daddr;
1826         fl4.saddr = *saddr;
1827         fl4.fl4_dport = dport;
1828         fl4.fl4_sport = sport;
1829 
1830         rt = ip_route_output_key(vxlan->net, &fl4);
1831         if (likely(!IS_ERR(rt))) {
1832                 if (rt->dst.dev == dev) {
1833                         netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1834                         ip_rt_put(rt);
1835                         return ERR_PTR(-ELOOP);
1836                 }
1837 
1838                 *saddr = fl4.saddr;
1839                 if (use_cache)
1840                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1841         } else {
1842                 netdev_dbg(dev, "no route to %pI4\n", &daddr);
1843                 return ERR_PTR(-ENETUNREACH);
1844         }
1845         return rt;
1846 }
1847 
1848 #if IS_ENABLED(CONFIG_IPV6)
1849 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1850                                           struct net_device *dev,
1851                                           struct vxlan_sock *sock6,
1852                                           struct sk_buff *skb, int oif, u8 tos,
1853                                           __be32 label,
1854                                           const struct in6_addr *daddr,
1855                                           struct in6_addr *saddr,
1856                                           __be16 dport, __be16 sport,
1857                                           struct dst_cache *dst_cache,
1858                                           const struct ip_tunnel_info *info)
1859 {
1860         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1861         struct dst_entry *ndst;
1862         struct flowi6 fl6;
1863         int err;
1864 
1865         if (!sock6)
1866                 return ERR_PTR(-EIO);
1867 
1868         if (tos && !info)
1869                 use_cache = false;
1870         if (use_cache) {
1871                 ndst = dst_cache_get_ip6(dst_cache, saddr);
1872                 if (ndst)
1873                         return ndst;
1874         }
1875 
1876         memset(&fl6, 0, sizeof(fl6));
1877         fl6.flowi6_oif = oif;
1878         fl6.daddr = *daddr;
1879         fl6.saddr = *saddr;
1880         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1881         fl6.flowi6_mark = skb->mark;
1882         fl6.flowi6_proto = IPPROTO_UDP;
1883         fl6.fl6_dport = dport;
1884         fl6.fl6_sport = sport;
1885 
1886         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1887                                          sock6->sock->sk,
1888                                          &ndst, &fl6);
1889         if (unlikely(err < 0)) {
1890                 netdev_dbg(dev, "no route to %pI6\n", daddr);
1891                 return ERR_PTR(-ENETUNREACH);
1892         }
1893 
1894         if (unlikely(ndst->dev == dev)) {
1895                 netdev_dbg(dev, "circular route to %pI6\n", daddr);
1896                 dst_release(ndst);
1897                 return ERR_PTR(-ELOOP);
1898         }
1899 
1900         *saddr = fl6.saddr;
1901         if (use_cache)
1902                 dst_cache_set_ip6(dst_cache, ndst, saddr);
1903         return ndst;
1904 }
1905 #endif
1906 
1907 /* Bypass encapsulation if the destination is local */
1908 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1909                                struct vxlan_dev *dst_vxlan)
1910 {
1911         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1912         union vxlan_addr loopback;
1913         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1914         struct net_device *dev = skb->dev;
1915         int len = skb->len;
1916 
1917         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1918         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1919         skb->pkt_type = PACKET_HOST;
1920         skb->encapsulation = 0;
1921         skb->dev = dst_vxlan->dev;
1922         __skb_pull(skb, skb_network_offset(skb));
1923 
1924         if (remote_ip->sa.sa_family == AF_INET) {
1925                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1926                 loopback.sa.sa_family =  AF_INET;
1927 #if IS_ENABLED(CONFIG_IPV6)
1928         } else {
1929                 loopback.sin6.sin6_addr = in6addr_loopback;
1930                 loopback.sa.sa_family =  AF_INET6;
1931 #endif
1932         }
1933 
1934         if (dst_vxlan->flags & VXLAN_F_LEARN)
1935                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1936 
1937         u64_stats_update_begin(&tx_stats->syncp);
1938         tx_stats->tx_packets++;
1939         tx_stats->tx_bytes += len;
1940         u64_stats_update_end(&tx_stats->syncp);
1941 
1942         if (netif_rx(skb) == NET_RX_SUCCESS) {
1943                 u64_stats_update_begin(&rx_stats->syncp);
1944                 rx_stats->rx_packets++;
1945                 rx_stats->rx_bytes += len;
1946                 u64_stats_update_end(&rx_stats->syncp);
1947         } else {
1948                 dev->stats.rx_dropped++;
1949         }
1950 }
1951 
1952 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
1953                                  struct vxlan_dev *vxlan, union vxlan_addr *daddr,
1954                                  __be32 dst_port, __be32 vni, struct dst_entry *dst,
1955                                  u32 rt_flags)
1956 {
1957 #if IS_ENABLED(CONFIG_IPV6)
1958         /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
1959          * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
1960          * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
1961          */
1962         BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
1963 #endif
1964         /* Bypass encapsulation if the destination is local */
1965         if (rt_flags & RTCF_LOCAL &&
1966             !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1967                 struct vxlan_dev *dst_vxlan;
1968 
1969                 dst_release(dst);
1970                 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1971                                            daddr->sa.sa_family, dst_port,
1972                                            vxlan->flags);
1973                 if (!dst_vxlan) {
1974                         dev->stats.tx_errors++;
1975                         kfree_skb(skb);
1976 
1977                         return -ENOENT;
1978                 }
1979                 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1980                 return 1;
1981         }
1982 
1983         return 0;
1984 }
1985 
1986 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1987                            struct vxlan_rdst *rdst, bool did_rsc)
1988 {
1989         struct dst_cache *dst_cache;
1990         struct ip_tunnel_info *info;
1991         struct vxlan_dev *vxlan = netdev_priv(dev);
1992         const struct iphdr *old_iph = ip_hdr(skb);
1993         union vxlan_addr *dst;
1994         union vxlan_addr remote_ip, local_ip;
1995         union vxlan_addr *src;
1996         struct vxlan_metadata _md;
1997         struct vxlan_metadata *md = &_md;
1998         __be16 src_port = 0, dst_port;
1999         struct dst_entry *ndst = NULL;
2000         __be32 vni, label;
2001         __u8 tos, ttl;
2002         int err;
2003         u32 flags = vxlan->flags;
2004         bool udp_sum = false;
2005         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2006 
2007         info = skb_tunnel_info(skb);
2008 
2009         if (rdst) {
2010                 dst = &rdst->remote_ip;
2011                 if (vxlan_addr_any(dst)) {
2012                         if (did_rsc) {
2013                                 /* short-circuited back to local bridge */
2014                                 vxlan_encap_bypass(skb, vxlan, vxlan);
2015                                 return;
2016                         }
2017                         goto drop;
2018                 }
2019 
2020                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2021                 vni = rdst->remote_vni;
2022                 src = &vxlan->cfg.saddr;
2023                 dst_cache = &rdst->dst_cache;
2024                 md->gbp = skb->mark;
2025                 ttl = vxlan->cfg.ttl;
2026                 if (!ttl && vxlan_addr_multicast(dst))
2027                         ttl = 1;
2028 
2029                 tos = vxlan->cfg.tos;
2030                 if (tos == 1)
2031                         tos = ip_tunnel_get_dsfield(old_iph, skb);
2032 
2033                 if (dst->sa.sa_family == AF_INET)
2034                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2035                 else
2036                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2037                 label = vxlan->cfg.label;
2038         } else {
2039                 if (!info) {
2040                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2041                                   dev->name);
2042                         goto drop;
2043                 }
2044                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2045                 if (remote_ip.sa.sa_family == AF_INET) {
2046                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2047                         local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2048                 } else {
2049                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2050                         local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2051                 }
2052                 dst = &remote_ip;
2053                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2054                 vni = tunnel_id_to_key32(info->key.tun_id);
2055                 src = &local_ip;
2056                 dst_cache = &info->dst_cache;
2057                 if (info->options_len)
2058                         md = ip_tunnel_info_opts(info);
2059                 ttl = info->key.ttl;
2060                 tos = info->key.tos;
2061                 label = info->key.label;
2062                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2063         }
2064         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2065                                      vxlan->cfg.port_max, true);
2066 
2067         if (dst->sa.sa_family == AF_INET) {
2068                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2069                 struct rtable *rt;
2070                 __be16 df = 0;
2071 
2072                 rt = vxlan_get_route(vxlan, dev, sock4, skb,
2073                                      rdst ? rdst->remote_ifindex : 0, tos,
2074                                      dst->sin.sin_addr.s_addr,
2075                                      &src->sin.sin_addr.s_addr,
2076                                      dst_port, src_port,
2077                                      dst_cache, info);
2078                 if (IS_ERR(rt)) {
2079                         err = PTR_ERR(rt);
2080                         goto tx_error;
2081                 }
2082 
2083                 /* Bypass encapsulation if the destination is local */
2084                 if (!info) {
2085                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2086                                                     dst_port, vni, &rt->dst,
2087                                                     rt->rt_flags);
2088                         if (err)
2089                                 return;
2090                 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2091                         df = htons(IP_DF);
2092                 }
2093 
2094                 ndst = &rt->dst;
2095                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2096                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2097                 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2098                                       vni, md, flags, udp_sum);
2099                 if (err < 0)
2100                         goto tx_error;
2101 
2102                 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, src->sin.sin_addr.s_addr,
2103                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2104                                     src_port, dst_port, xnet, !udp_sum);
2105 #if IS_ENABLED(CONFIG_IPV6)
2106         } else {
2107                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2108 
2109                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb,
2110                                         rdst ? rdst->remote_ifindex : 0, tos,
2111                                         label, &dst->sin6.sin6_addr,
2112                                         &src->sin6.sin6_addr,
2113                                         dst_port, src_port,
2114                                         dst_cache, info);
2115                 if (IS_ERR(ndst)) {
2116                         err = PTR_ERR(ndst);
2117                         ndst = NULL;
2118                         goto tx_error;
2119                 }
2120 
2121                 if (!info) {
2122                         u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2123 
2124                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2125                                                     dst_port, vni, ndst,
2126                                                     rt6i_flags);
2127                         if (err)
2128                                 return;
2129                 }
2130 
2131                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2132                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2133                 skb_scrub_packet(skb, xnet);
2134                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2135                                       vni, md, flags, udp_sum);
2136                 if (err < 0)
2137                         goto tx_error;
2138 
2139                 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2140                                      &src->sin6.sin6_addr,
2141                                      &dst->sin6.sin6_addr, tos, ttl,
2142                                      label, src_port, dst_port, !udp_sum);
2143 #endif
2144         }
2145         return;
2146 
2147 drop:
2148         dev->stats.tx_dropped++;
2149         dev_kfree_skb(skb);
2150         return;
2151 
2152 tx_error:
2153         if (err == -ELOOP)
2154                 dev->stats.collisions++;
2155         else if (err == -ENETUNREACH)
2156                 dev->stats.tx_carrier_errors++;
2157         dst_release(ndst);
2158         dev->stats.tx_errors++;
2159         kfree_skb(skb);
2160 }
2161 
2162 /* Transmit local packets over Vxlan
2163  *
2164  * Outer IP header inherits ECN and DF from inner header.
2165  * Outer UDP destination is the VXLAN assigned port.
2166  *           source port is based on hash of flow
2167  */
2168 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2169 {
2170         struct vxlan_dev *vxlan = netdev_priv(dev);
2171         const struct ip_tunnel_info *info;
2172         struct ethhdr *eth;
2173         bool did_rsc = false;
2174         struct vxlan_rdst *rdst, *fdst = NULL;
2175         struct vxlan_fdb *f;
2176 
2177         info = skb_tunnel_info(skb);
2178 
2179         skb_reset_mac_header(skb);
2180 
2181         if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2182                 if (info && info->mode & IP_TUNNEL_INFO_TX)
2183                         vxlan_xmit_one(skb, dev, NULL, false);
2184                 else
2185                         kfree_skb(skb);
2186                 return NETDEV_TX_OK;
2187         }
2188 
2189         if (vxlan->flags & VXLAN_F_PROXY) {
2190                 eth = eth_hdr(skb);
2191                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2192                         return arp_reduce(dev, skb);
2193 #if IS_ENABLED(CONFIG_IPV6)
2194                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2195                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2196                                        + sizeof(struct nd_msg)) &&
2197                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2198                                 struct nd_msg *msg;
2199 
2200                                 msg = (struct nd_msg *)skb_transport_header(skb);
2201                                 if (msg->icmph.icmp6_code == 0 &&
2202                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2203                                         return neigh_reduce(dev, skb);
2204                 }
2205 #endif
2206         }
2207 
2208         eth = eth_hdr(skb);
2209         f = vxlan_find_mac(vxlan, eth->h_dest);
2210         did_rsc = false;
2211 
2212         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2213             (ntohs(eth->h_proto) == ETH_P_IP ||
2214              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2215                 did_rsc = route_shortcircuit(dev, skb);
2216                 if (did_rsc)
2217                         f = vxlan_find_mac(vxlan, eth->h_dest);
2218         }
2219 
2220         if (f == NULL) {
2221                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2222                 if (f == NULL) {
2223                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2224                             !is_multicast_ether_addr(eth->h_dest))
2225                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2226 
2227                         dev->stats.tx_dropped++;
2228                         kfree_skb(skb);
2229                         return NETDEV_TX_OK;
2230                 }
2231         }
2232 
2233         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2234                 struct sk_buff *skb1;
2235 
2236                 if (!fdst) {
2237                         fdst = rdst;
2238                         continue;
2239                 }
2240                 skb1 = skb_clone(skb, GFP_ATOMIC);
2241                 if (skb1)
2242                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2243         }
2244 
2245         if (fdst)
2246                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2247         else
2248                 kfree_skb(skb);
2249         return NETDEV_TX_OK;
2250 }
2251 
2252 /* Walk the forwarding table and purge stale entries */
2253 static void vxlan_cleanup(unsigned long arg)
2254 {
2255         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2256         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2257         unsigned int h;
2258 
2259         if (!netif_running(vxlan->dev))
2260                 return;
2261 
2262         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2263                 struct hlist_node *p, *n;
2264 
2265                 spin_lock_bh(&vxlan->hash_lock);
2266                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2267                         struct vxlan_fdb *f
2268                                 = container_of(p, struct vxlan_fdb, hlist);
2269                         unsigned long timeout;
2270 
2271                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2272                                 continue;
2273 
2274                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2275                         if (time_before_eq(timeout, jiffies)) {
2276                                 netdev_dbg(vxlan->dev,
2277                                            "garbage collect %pM\n",
2278                                            f->eth_addr);
2279                                 f->state = NUD_STALE;
2280                                 vxlan_fdb_destroy(vxlan, f);
2281                         } else if (time_before(timeout, next_timer))
2282                                 next_timer = timeout;
2283                 }
2284                 spin_unlock_bh(&vxlan->hash_lock);
2285         }
2286 
2287         mod_timer(&vxlan->age_timer, next_timer);
2288 }
2289 
2290 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2291 {
2292         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2293         __be32 vni = vxlan->default_dst.remote_vni;
2294 
2295         spin_lock(&vn->sock_lock);
2296         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2297         spin_unlock(&vn->sock_lock);
2298 }
2299 
2300 /* Setup stats when device is created */
2301 static int vxlan_init(struct net_device *dev)
2302 {
2303         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2304         if (!dev->tstats)
2305                 return -ENOMEM;
2306 
2307         return 0;
2308 }
2309 
2310 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2311 {
2312         struct vxlan_fdb *f;
2313 
2314         spin_lock_bh(&vxlan->hash_lock);
2315         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2316         if (f)
2317                 vxlan_fdb_destroy(vxlan, f);
2318         spin_unlock_bh(&vxlan->hash_lock);
2319 }
2320 
2321 static void vxlan_uninit(struct net_device *dev)
2322 {
2323         struct vxlan_dev *vxlan = netdev_priv(dev);
2324 
2325         vxlan_fdb_delete_default(vxlan);
2326 
2327         free_percpu(dev->tstats);
2328 }
2329 
2330 /* Start ageing timer and join group when device is brought up */
2331 static int vxlan_open(struct net_device *dev)
2332 {
2333         struct vxlan_dev *vxlan = netdev_priv(dev);
2334         int ret;
2335 
2336         ret = vxlan_sock_add(vxlan);
2337         if (ret < 0)
2338                 return ret;
2339 
2340         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2341                 ret = vxlan_igmp_join(vxlan);
2342                 if (ret == -EADDRINUSE)
2343                         ret = 0;
2344                 if (ret) {
2345                         vxlan_sock_release(vxlan);
2346                         return ret;
2347                 }
2348         }
2349 
2350         if (vxlan->cfg.age_interval)
2351                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2352 
2353         return ret;
2354 }
2355 
2356 /* Purge the forwarding table */
2357 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2358 {
2359         unsigned int h;
2360 
2361         spin_lock_bh(&vxlan->hash_lock);
2362         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2363                 struct hlist_node *p, *n;
2364                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2365                         struct vxlan_fdb *f
2366                                 = container_of(p, struct vxlan_fdb, hlist);
2367                         if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2368                                 continue;
2369                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2370                         if (!is_zero_ether_addr(f->eth_addr))
2371                                 vxlan_fdb_destroy(vxlan, f);
2372                 }
2373         }
2374         spin_unlock_bh(&vxlan->hash_lock);
2375 }
2376 
2377 /* Cleanup timer and forwarding table on shutdown */
2378 static int vxlan_stop(struct net_device *dev)
2379 {
2380         struct vxlan_dev *vxlan = netdev_priv(dev);
2381         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2382         int ret = 0;
2383 
2384         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2385             !vxlan_group_used(vn, vxlan))
2386                 ret = vxlan_igmp_leave(vxlan);
2387 
2388         del_timer_sync(&vxlan->age_timer);
2389 
2390         vxlan_flush(vxlan, false);
2391         vxlan_sock_release(vxlan);
2392 
2393         return ret;
2394 }
2395 
2396 /* Stub, nothing needs to be done. */
2397 static void vxlan_set_multicast_list(struct net_device *dev)
2398 {
2399 }
2400 
2401 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2402 {
2403         struct vxlan_dev *vxlan = netdev_priv(dev);
2404         struct vxlan_rdst *dst = &vxlan->default_dst;
2405         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2406                                                          dst->remote_ifindex);
2407         bool use_ipv6 = false;
2408 
2409         if (dst->remote_ip.sa.sa_family == AF_INET6)
2410                 use_ipv6 = true;
2411 
2412         /* This check is different than dev->max_mtu, because it looks at
2413          * the lowerdev->mtu, rather than the static dev->max_mtu
2414          */
2415         if (lowerdev) {
2416                 int max_mtu = lowerdev->mtu -
2417                               (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2418                 if (new_mtu > max_mtu)
2419                         return -EINVAL;
2420         }
2421 
2422         dev->mtu = new_mtu;
2423         return 0;
2424 }
2425 
2426 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2427 {
2428         struct vxlan_dev *vxlan = netdev_priv(dev);
2429         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2430         __be16 sport, dport;
2431 
2432         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2433                                   vxlan->cfg.port_max, true);
2434         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2435 
2436         if (ip_tunnel_info_af(info) == AF_INET) {
2437                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2438                 struct rtable *rt;
2439 
2440                 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2441                                      info->key.u.ipv4.dst,
2442                                      &info->key.u.ipv4.src, dport, sport,
2443                                      &info->dst_cache, info);
2444                 if (IS_ERR(rt))
2445                         return PTR_ERR(rt);
2446                 ip_rt_put(rt);
2447         } else {
2448 #if IS_ENABLED(CONFIG_IPV6)
2449                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2450                 struct dst_entry *ndst;
2451 
2452                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2453                                         info->key.label, &info->key.u.ipv6.dst,
2454                                         &info->key.u.ipv6.src, dport, sport,
2455                                         &info->dst_cache, info);
2456                 if (IS_ERR(ndst))
2457                         return PTR_ERR(ndst);
2458                 dst_release(ndst);
2459 #else /* !CONFIG_IPV6 */
2460                 return -EPFNOSUPPORT;
2461 #endif
2462         }
2463         info->key.tp_src = sport;
2464         info->key.tp_dst = dport;
2465         return 0;
2466 }
2467 
2468 static const struct net_device_ops vxlan_netdev_ether_ops = {
2469         .ndo_init               = vxlan_init,
2470         .ndo_uninit             = vxlan_uninit,
2471         .ndo_open               = vxlan_open,
2472         .ndo_stop               = vxlan_stop,
2473         .ndo_start_xmit         = vxlan_xmit,
2474         .ndo_get_stats64        = ip_tunnel_get_stats64,
2475         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2476         .ndo_change_mtu         = vxlan_change_mtu,
2477         .ndo_validate_addr      = eth_validate_addr,
2478         .ndo_set_mac_address    = eth_mac_addr,
2479         .ndo_fdb_add            = vxlan_fdb_add,
2480         .ndo_fdb_del            = vxlan_fdb_delete,
2481         .ndo_fdb_dump           = vxlan_fdb_dump,
2482         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2483 };
2484 
2485 static const struct net_device_ops vxlan_netdev_raw_ops = {
2486         .ndo_init               = vxlan_init,
2487         .ndo_uninit             = vxlan_uninit,
2488         .ndo_open               = vxlan_open,
2489         .ndo_stop               = vxlan_stop,
2490         .ndo_start_xmit         = vxlan_xmit,
2491         .ndo_get_stats64        = ip_tunnel_get_stats64,
2492         .ndo_change_mtu         = vxlan_change_mtu,
2493         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2494 };
2495 
2496 /* Info for udev, that this is a virtual tunnel endpoint */
2497 static struct device_type vxlan_type = {
2498         .name = "vxlan",
2499 };
2500 
2501 /* Calls the ndo_udp_tunnel_add of the caller in order to
2502  * supply the listening VXLAN udp ports. Callers are expected
2503  * to implement the ndo_udp_tunnel_add.
2504  */
2505 static void vxlan_push_rx_ports(struct net_device *dev)
2506 {
2507         struct vxlan_sock *vs;
2508         struct net *net = dev_net(dev);
2509         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2510         unsigned int i;
2511 
2512         spin_lock(&vn->sock_lock);
2513         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2514                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist)
2515                         udp_tunnel_push_rx_port(dev, vs->sock,
2516                                                 (vs->flags & VXLAN_F_GPE) ?
2517                                                 UDP_TUNNEL_TYPE_VXLAN_GPE :
2518                                                 UDP_TUNNEL_TYPE_VXLAN);
2519         }
2520         spin_unlock(&vn->sock_lock);
2521 }
2522 
2523 /* Initialize the device structure. */
2524 static void vxlan_setup(struct net_device *dev)
2525 {
2526         struct vxlan_dev *vxlan = netdev_priv(dev);
2527         unsigned int h;
2528 
2529         eth_hw_addr_random(dev);
2530         ether_setup(dev);
2531 
2532         dev->destructor = free_netdev;
2533         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2534 
2535         dev->features   |= NETIF_F_LLTX;
2536         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2537         dev->features   |= NETIF_F_RXCSUM;
2538         dev->features   |= NETIF_F_GSO_SOFTWARE;
2539 
2540         dev->vlan_features = dev->features;
2541         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2542         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2543         netif_keep_dst(dev);
2544         dev->priv_flags |= IFF_NO_QUEUE;
2545 
2546         INIT_LIST_HEAD(&vxlan->next);
2547         spin_lock_init(&vxlan->hash_lock);
2548 
2549         init_timer_deferrable(&vxlan->age_timer);
2550         vxlan->age_timer.function = vxlan_cleanup;
2551         vxlan->age_timer.data = (unsigned long) vxlan;
2552 
2553         vxlan->cfg.dst_port = htons(vxlan_port);
2554 
2555         vxlan->dev = dev;
2556 
2557         gro_cells_init(&vxlan->gro_cells, dev);
2558 
2559         for (h = 0; h < FDB_HASH_SIZE; ++h)
2560                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2561 }
2562 
2563 static void vxlan_ether_setup(struct net_device *dev)
2564 {
2565         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2566         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2567         dev->netdev_ops = &vxlan_netdev_ether_ops;
2568 }
2569 
2570 static void vxlan_raw_setup(struct net_device *dev)
2571 {
2572         dev->header_ops = NULL;
2573         dev->type = ARPHRD_NONE;
2574         dev->hard_header_len = 0;
2575         dev->addr_len = 0;
2576         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2577         dev->netdev_ops = &vxlan_netdev_raw_ops;
2578 }
2579 
2580 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2581         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2582         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2583         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2584         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2585         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2586         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2587         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2588         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2589         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
2590         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2591         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2592         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2593         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2594         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2595         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2596         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2597         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2598         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2599         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2600         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2601         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2602         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2603         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2604         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2605         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2606         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
2607         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2608 };
2609 
2610 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2611 {
2612         if (tb[IFLA_ADDRESS]) {
2613                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2614                         pr_debug("invalid link address (not ethernet)\n");
2615                         return -EINVAL;
2616                 }
2617 
2618                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2619                         pr_debug("invalid all zero ethernet address\n");
2620                         return -EADDRNOTAVAIL;
2621                 }
2622         }
2623 
2624         if (!data)
2625                 return -EINVAL;
2626 
2627         if (data[IFLA_VXLAN_ID]) {
2628                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2629                 if (id >= VXLAN_VID_MASK)
2630                         return -ERANGE;
2631         }
2632 
2633         if (data[IFLA_VXLAN_PORT_RANGE]) {
2634                 const struct ifla_vxlan_port_range *p
2635                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2636 
2637                 if (ntohs(p->high) < ntohs(p->low)) {
2638                         pr_debug("port range %u .. %u not valid\n",
2639                                  ntohs(p->low), ntohs(p->high));
2640                         return -EINVAL;
2641                 }
2642         }
2643 
2644         return 0;
2645 }
2646 
2647 static void vxlan_get_drvinfo(struct net_device *netdev,
2648                               struct ethtool_drvinfo *drvinfo)
2649 {
2650         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2651         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2652 }
2653 
2654 static const struct ethtool_ops vxlan_ethtool_ops = {
2655         .get_drvinfo    = vxlan_get_drvinfo,
2656         .get_link       = ethtool_op_get_link,
2657 };
2658 
2659 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2660                                         __be16 port, u32 flags)
2661 {
2662         struct socket *sock;
2663         struct udp_port_cfg udp_conf;
2664         int err;
2665 
2666         memset(&udp_conf, 0, sizeof(udp_conf));
2667 
2668         if (ipv6) {
2669                 udp_conf.family = AF_INET6;
2670                 udp_conf.use_udp6_rx_checksums =
2671                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2672                 udp_conf.ipv6_v6only = 1;
2673         } else {
2674                 udp_conf.family = AF_INET;
2675         }
2676 
2677         udp_conf.local_udp_port = port;
2678 
2679         /* Open UDP socket */
2680         err = udp_sock_create(net, &udp_conf, &sock);
2681         if (err < 0)
2682                 return ERR_PTR(err);
2683 
2684         return sock;
2685 }
2686 
2687 /* Create new listen socket if needed */
2688 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2689                                               __be16 port, u32 flags)
2690 {
2691         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2692         struct vxlan_sock *vs;
2693         struct socket *sock;
2694         unsigned int h;
2695         struct udp_tunnel_sock_cfg tunnel_cfg;
2696 
2697         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2698         if (!vs)
2699                 return ERR_PTR(-ENOMEM);
2700 
2701         for (h = 0; h < VNI_HASH_SIZE; ++h)
2702                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2703 
2704         sock = vxlan_create_sock(net, ipv6, port, flags);
2705         if (IS_ERR(sock)) {
2706                 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2707                         PTR_ERR(sock));
2708                 kfree(vs);
2709                 return ERR_CAST(sock);
2710         }
2711 
2712         vs->sock = sock;
2713         atomic_set(&vs->refcnt, 1);
2714         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2715 
2716         spin_lock(&vn->sock_lock);
2717         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2718         udp_tunnel_notify_add_rx_port(sock,
2719                                       (vs->flags & VXLAN_F_GPE) ?
2720                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
2721                                       UDP_TUNNEL_TYPE_VXLAN);
2722         spin_unlock(&vn->sock_lock);
2723 
2724         /* Mark socket as an encapsulation socket. */
2725         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2726         tunnel_cfg.sk_user_data = vs;
2727         tunnel_cfg.encap_type = 1;
2728         tunnel_cfg.encap_rcv = vxlan_rcv;
2729         tunnel_cfg.encap_destroy = NULL;
2730         tunnel_cfg.gro_receive = vxlan_gro_receive;
2731         tunnel_cfg.gro_complete = vxlan_gro_complete;
2732 
2733         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2734 
2735         return vs;
2736 }
2737 
2738 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2739 {
2740         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2741         struct vxlan_sock *vs = NULL;
2742 
2743         if (!vxlan->cfg.no_share) {
2744                 spin_lock(&vn->sock_lock);
2745                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2746                                      vxlan->cfg.dst_port, vxlan->flags);
2747                 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2748                         spin_unlock(&vn->sock_lock);
2749                         return -EBUSY;
2750                 }
2751                 spin_unlock(&vn->sock_lock);
2752         }
2753         if (!vs)
2754                 vs = vxlan_socket_create(vxlan->net, ipv6,
2755                                          vxlan->cfg.dst_port, vxlan->flags);
2756         if (IS_ERR(vs))
2757                 return PTR_ERR(vs);
2758 #if IS_ENABLED(CONFIG_IPV6)
2759         if (ipv6)
2760                 rcu_assign_pointer(vxlan->vn6_sock, vs);
2761         else
2762 #endif
2763                 rcu_assign_pointer(vxlan->vn4_sock, vs);
2764         vxlan_vs_add_dev(vs, vxlan);
2765         return 0;
2766 }
2767 
2768 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2769 {
2770         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2771         bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2772         int ret = 0;
2773 
2774         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2775 #if IS_ENABLED(CONFIG_IPV6)
2776         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2777         if (ipv6 || metadata)
2778                 ret = __vxlan_sock_add(vxlan, true);
2779 #endif
2780         if (!ret && (!ipv6 || metadata))
2781                 ret = __vxlan_sock_add(vxlan, false);
2782         if (ret < 0)
2783                 vxlan_sock_release(vxlan);
2784         return ret;
2785 }
2786 
2787 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2788                                struct vxlan_config *conf)
2789 {
2790         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2791         struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2792         struct vxlan_rdst *dst = &vxlan->default_dst;
2793         unsigned short needed_headroom = ETH_HLEN;
2794         int err;
2795         bool use_ipv6 = false;
2796         __be16 default_port = vxlan->cfg.dst_port;
2797         struct net_device *lowerdev = NULL;
2798 
2799         if (conf->flags & VXLAN_F_GPE) {
2800                 /* For now, allow GPE only together with COLLECT_METADATA.
2801                  * This can be relaxed later; in such case, the other side
2802                  * of the PtP link will have to be provided.
2803                  */
2804                 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
2805                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2806                         pr_info("unsupported combination of extensions\n");
2807                         return -EINVAL;
2808                 }
2809 
2810                 vxlan_raw_setup(dev);
2811         } else {
2812                 vxlan_ether_setup(dev);
2813         }
2814 
2815         /* MTU range: 68 - 65535 */
2816         dev->min_mtu = ETH_MIN_MTU;
2817         dev->max_mtu = ETH_MAX_MTU;
2818 
2819         vxlan->net = src_net;
2820 
2821         dst->remote_vni = conf->vni;
2822 
2823         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2824 
2825         /* Unless IPv6 is explicitly requested, assume IPv4 */
2826         if (!dst->remote_ip.sa.sa_family)
2827                 dst->remote_ip.sa.sa_family = AF_INET;
2828 
2829         if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2830             vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2831                 if (!IS_ENABLED(CONFIG_IPV6))
2832                         return -EPFNOSUPPORT;
2833                 use_ipv6 = true;
2834                 vxlan->flags |= VXLAN_F_IPV6;
2835         }
2836 
2837         if (conf->label && !use_ipv6) {
2838                 pr_info("label only supported in use with IPv6\n");
2839                 return -EINVAL;
2840         }
2841 
2842         if (conf->remote_ifindex) {
2843                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2844                 dst->remote_ifindex = conf->remote_ifindex;
2845 
2846                 if (!lowerdev) {
2847                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2848                         return -ENODEV;
2849                 }
2850 
2851 #if IS_ENABLED(CONFIG_IPV6)
2852                 if (use_ipv6) {
2853                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2854                         if (idev && idev->cnf.disable_ipv6) {
2855                                 pr_info("IPv6 is disabled via sysctl\n");
2856                                 return -EPERM;
2857                         }
2858                 }
2859 #endif
2860 
2861                 if (!conf->mtu)
2862                         dev->mtu = lowerdev->mtu -
2863                                    (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2864 
2865                 needed_headroom = lowerdev->hard_header_len;
2866         } else if (vxlan_addr_multicast(&dst->remote_ip)) {
2867                 pr_info("multicast destination requires interface to be specified\n");
2868                 return -EINVAL;
2869         }
2870 
2871         if (conf->mtu) {
2872                 int max_mtu = ETH_MAX_MTU;
2873 
2874                 if (lowerdev)
2875                         max_mtu = lowerdev->mtu;
2876 
2877                 max_mtu -= (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2878 
2879                 if (conf->mtu < dev->min_mtu || conf->mtu > dev->max_mtu)
2880                         return -EINVAL;
2881 
2882                 dev->mtu = conf->mtu;
2883 
2884                 if (conf->mtu > max_mtu)
2885                         dev->mtu = max_mtu;
2886         }
2887 
2888         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2889                 needed_headroom += VXLAN6_HEADROOM;
2890         else
2891                 needed_headroom += VXLAN_HEADROOM;
2892         dev->needed_headroom = needed_headroom;
2893 
2894         memcpy(&vxlan->cfg, conf, sizeof(*conf));
2895         if (!vxlan->cfg.dst_port) {
2896                 if (conf->flags & VXLAN_F_GPE)
2897                         vxlan->cfg.dst_port = htons(4790); /* IANA VXLAN-GPE port */
2898                 else
2899                         vxlan->cfg.dst_port = default_port;
2900         }
2901         vxlan->flags |= conf->flags;
2902 
2903         if (!vxlan->cfg.age_interval)
2904                 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2905 
2906         list_for_each_entry(tmp, &vn->vxlan_list, next) {
2907                 if (tmp->cfg.vni == conf->vni &&
2908                     (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2909                      tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2910                     tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2911                     (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2912                     (vxlan->flags & VXLAN_F_RCV_FLAGS)) {
2913                         pr_info("duplicate VNI %u\n", be32_to_cpu(conf->vni));
2914                         return -EEXIST;
2915                 }
2916         }
2917 
2918         dev->ethtool_ops = &vxlan_ethtool_ops;
2919 
2920         /* create an fdb entry for a valid default destination */
2921         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2922                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2923                                        &vxlan->default_dst.remote_ip,
2924                                        NUD_REACHABLE|NUD_PERMANENT,
2925                                        NLM_F_EXCL|NLM_F_CREATE,
2926                                        vxlan->cfg.dst_port,
2927                                        vxlan->default_dst.remote_vni,
2928                                        vxlan->default_dst.remote_ifindex,
2929                                        NTF_SELF);
2930                 if (err)
2931                         return err;
2932         }
2933 
2934         err = register_netdevice(dev);
2935         if (err) {
2936                 vxlan_fdb_delete_default(vxlan);
2937                 return err;
2938         }
2939 
2940         list_add(&vxlan->next, &vn->vxlan_list);
2941 
2942         return 0;
2943 }
2944 
2945 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2946                          struct nlattr *tb[], struct nlattr *data[])
2947 {
2948         struct vxlan_config conf;
2949 
2950         memset(&conf, 0, sizeof(conf));
2951 
2952         if (data[IFLA_VXLAN_ID])
2953                 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2954 
2955         if (data[IFLA_VXLAN_GROUP]) {
2956                 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2957         } else if (data[IFLA_VXLAN_GROUP6]) {
2958                 if (!IS_ENABLED(CONFIG_IPV6))
2959                         return -EPFNOSUPPORT;
2960 
2961                 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2962                 conf.remote_ip.sa.sa_family = AF_INET6;
2963         }
2964 
2965         if (data[IFLA_VXLAN_LOCAL]) {
2966                 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2967                 conf.saddr.sa.sa_family = AF_INET;
2968         } else if (data[IFLA_VXLAN_LOCAL6]) {
2969                 if (!IS_ENABLED(CONFIG_IPV6))
2970                         return -EPFNOSUPPORT;
2971 
2972                 /* TODO: respect scope id */
2973                 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2974                 conf.saddr.sa.sa_family = AF_INET6;
2975         }
2976 
2977         if (data[IFLA_VXLAN_LINK])
2978                 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2979 
2980         if (data[IFLA_VXLAN_TOS])
2981                 conf.tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2982 
2983         if (data[IFLA_VXLAN_TTL])
2984                 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2985 
2986         if (data[IFLA_VXLAN_LABEL])
2987                 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
2988                              IPV6_FLOWLABEL_MASK;
2989 
2990         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2991                 conf.flags |= VXLAN_F_LEARN;
2992 
2993         if (data[IFLA_VXLAN_AGEING])
2994                 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2995 
2996         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2997                 conf.flags |= VXLAN_F_PROXY;
2998 
2999         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
3000                 conf.flags |= VXLAN_F_RSC;
3001 
3002         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3003                 conf.flags |= VXLAN_F_L2MISS;
3004 
3005         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3006                 conf.flags |= VXLAN_F_L3MISS;
3007 
3008         if (data[IFLA_VXLAN_LIMIT])
3009                 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3010 
3011         if (data[IFLA_VXLAN_COLLECT_METADATA] &&
3012             nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3013                 conf.flags |= VXLAN_F_COLLECT_METADATA;
3014 
3015         if (data[IFLA_VXLAN_PORT_RANGE]) {
3016                 const struct ifla_vxlan_port_range *p
3017                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3018                 conf.port_min = ntohs(p->low);
3019                 conf.port_max = ntohs(p->high);
3020         }
3021 
3022         if (data[IFLA_VXLAN_PORT])
3023                 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3024 
3025         if (data[IFLA_VXLAN_UDP_CSUM] &&
3026             !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3027                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3028 
3029         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
3030             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3031                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3032 
3033         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3034             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3035                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3036 
3037         if (data[IFLA_VXLAN_REMCSUM_TX] &&
3038             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3039                 conf.flags |= VXLAN_F_REMCSUM_TX;
3040 
3041         if (data[IFLA_VXLAN_REMCSUM_RX] &&
3042             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3043                 conf.flags |= VXLAN_F_REMCSUM_RX;
3044 
3045         if (data[IFLA_VXLAN_GBP])
3046                 conf.flags |= VXLAN_F_GBP;
3047 
3048         if (data[IFLA_VXLAN_GPE])
3049                 conf.flags |= VXLAN_F_GPE;
3050 
3051         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3052                 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3053 
3054         if (tb[IFLA_MTU])
3055                 conf.mtu = nla_get_u32(tb[IFLA_MTU]);
3056 
3057         return vxlan_dev_configure(src_net, dev, &conf);
3058 }
3059 
3060 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3061 {
3062         struct vxlan_dev *vxlan = netdev_priv(dev);
3063         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3064 
3065         vxlan_flush(vxlan, true);
3066 
3067         spin_lock(&vn->sock_lock);
3068         if (!hlist_unhashed(&vxlan->hlist))
3069                 hlist_del_rcu(&vxlan->hlist);
3070         spin_unlock(&vn->sock_lock);
3071 
3072         gro_cells_destroy(&vxlan->gro_cells);
3073         list_del(&vxlan->next);
3074         unregister_netdevice_queue(dev, head);
3075 }
3076 
3077 static size_t vxlan_get_size(const struct net_device *dev)
3078 {
3079 
3080         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
3081                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3082                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3083                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3084                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3085                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3086                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3087                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3088                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3089                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3090                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3091                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3092                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3093                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3094                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3095                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3096                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3097                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3098                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3099                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3100                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3101                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3102                 0;
3103 }
3104 
3105 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3106 {
3107         const struct vxlan_dev *vxlan = netdev_priv(dev);
3108         const struct vxlan_rdst *dst = &vxlan->default_dst;
3109         struct ifla_vxlan_port_range ports = {
3110                 .low =  htons(vxlan->cfg.port_min),
3111                 .high = htons(vxlan->cfg.port_max),
3112         };
3113 
3114         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3115                 goto nla_put_failure;
3116 
3117         if (!vxlan_addr_any(&dst->remote_ip)) {
3118                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3119                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3120                                             dst->remote_ip.sin.sin_addr.s_addr))
3121                                 goto nla_put_failure;
3122 #if IS_ENABLED(CONFIG_IPV6)
3123                 } else {
3124                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3125                                              &dst->remote_ip.sin6.sin6_addr))
3126                                 goto nla_put_failure;
3127 #endif
3128                 }
3129         }
3130 
3131         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3132                 goto nla_put_failure;
3133 
3134         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3135                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3136                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3137                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3138                                 goto nla_put_failure;
3139 #if IS_ENABLED(CONFIG_IPV6)
3140                 } else {
3141                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3142                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3143                                 goto nla_put_failure;
3144 #endif
3145                 }
3146         }
3147 
3148         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3149             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3150             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3151             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3152                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
3153             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3154                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
3155             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3156             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3157                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3158             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3159                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3160             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3161                        !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3162             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3163             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3164             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3165             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3166                         !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3167             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3168                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3169             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3170                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3171             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3172                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3173             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3174                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3175                 goto nla_put_failure;
3176 
3177         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3178                 goto nla_put_failure;
3179 
3180         if (vxlan->flags & VXLAN_F_GBP &&
3181             nla_put_flag(skb, IFLA_VXLAN_GBP))
3182                 goto nla_put_failure;
3183 
3184         if (vxlan->flags & VXLAN_F_GPE &&
3185             nla_put_flag(skb, IFLA_VXLAN_GPE))
3186                 goto nla_put_failure;
3187 
3188         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3189             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3190                 goto nla_put_failure;
3191 
3192         return 0;
3193 
3194 nla_put_failure:
3195         return -EMSGSIZE;
3196 }
3197 
3198 static struct net *vxlan_get_link_net(const struct net_device *dev)
3199 {
3200         struct vxlan_dev *vxlan = netdev_priv(dev);
3201 
3202         return vxlan->net;
3203 }
3204 
3205 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3206         .kind           = "vxlan",
3207         .maxtype        = IFLA_VXLAN_MAX,
3208         .policy         = vxlan_policy,
3209         .priv_size      = sizeof(struct vxlan_dev),
3210         .setup          = vxlan_setup,
3211         .validate       = vxlan_validate,
3212         .newlink        = vxlan_newlink,
3213         .dellink        = vxlan_dellink,
3214         .get_size       = vxlan_get_size,
3215         .fill_info      = vxlan_fill_info,
3216         .get_link_net   = vxlan_get_link_net,
3217 };
3218 
3219 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3220                                     u8 name_assign_type,
3221                                     struct vxlan_config *conf)
3222 {
3223         struct nlattr *tb[IFLA_MAX + 1];
3224         struct net_device *dev;
3225         int err;
3226 
3227         memset(&tb, 0, sizeof(tb));
3228 
3229         dev = rtnl_create_link(net, name, name_assign_type,
3230                                &vxlan_link_ops, tb);
3231         if (IS_ERR(dev))
3232                 return dev;
3233 
3234         err = vxlan_dev_configure(net, dev, conf);
3235         if (err < 0) {
3236                 free_netdev(dev);
3237                 return ERR_PTR(err);
3238         }
3239 
3240         err = rtnl_configure_link(dev, NULL);
3241         if (err < 0) {
3242                 LIST_HEAD(list_kill);
3243 
3244                 vxlan_dellink(dev, &list_kill);
3245                 unregister_netdevice_many(&list_kill);
3246                 return ERR_PTR(err);
3247         }
3248 
3249         return dev;
3250 }
3251 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3252 
3253 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3254                                              struct net_device *dev)
3255 {
3256         struct vxlan_dev *vxlan, *next;
3257         LIST_HEAD(list_kill);
3258 
3259         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3260                 struct vxlan_rdst *dst = &vxlan->default_dst;
3261 
3262                 /* In case we created vxlan device with carrier
3263                  * and we loose the carrier due to module unload
3264                  * we also need to remove vxlan device. In other
3265                  * cases, it's not necessary and remote_ifindex
3266                  * is 0 here, so no matches.
3267                  */
3268                 if (dst->remote_ifindex == dev->ifindex)
3269                         vxlan_dellink(vxlan->dev, &list_kill);
3270         }
3271 
3272         unregister_netdevice_many(&list_kill);
3273 }
3274 
3275 static int vxlan_netdevice_event(struct notifier_block *unused,
3276                                  unsigned long event, void *ptr)
3277 {
3278         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3279         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3280 
3281         if (event == NETDEV_UNREGISTER)
3282                 vxlan_handle_lowerdev_unregister(vn, dev);
3283         else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
3284                 vxlan_push_rx_ports(dev);
3285 
3286         return NOTIFY_DONE;
3287 }
3288 
3289 static struct notifier_block vxlan_notifier_block __read_mostly = {
3290         .notifier_call = vxlan_netdevice_event,
3291 };
3292 
3293 static __net_init int vxlan_init_net(struct net *net)
3294 {
3295         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3296         unsigned int h;
3297 
3298         INIT_LIST_HEAD(&vn->vxlan_list);
3299         spin_lock_init(&vn->sock_lock);
3300 
3301         for (h = 0; h < PORT_HASH_SIZE; ++h)
3302                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3303 
3304         return 0;
3305 }
3306 
3307 static void __net_exit vxlan_exit_net(struct net *net)
3308 {
3309         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3310         struct vxlan_dev *vxlan, *next;
3311         struct net_device *dev, *aux;
3312         LIST_HEAD(list);
3313 
3314         rtnl_lock();
3315         for_each_netdev_safe(net, dev, aux)
3316                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3317                         unregister_netdevice_queue(dev, &list);
3318 
3319         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3320                 /* If vxlan->dev is in the same netns, it has already been added
3321                  * to the list by the previous loop.
3322                  */
3323                 if (!net_eq(dev_net(vxlan->dev), net)) {
3324                         gro_cells_destroy(&vxlan->gro_cells);
3325                         unregister_netdevice_queue(vxlan->dev, &list);
3326                 }
3327         }
3328 
3329         unregister_netdevice_many(&list);
3330         rtnl_unlock();
3331 }
3332 
3333 static struct pernet_operations vxlan_net_ops = {
3334         .init = vxlan_init_net,
3335         .exit = vxlan_exit_net,
3336         .id   = &vxlan_net_id,
3337         .size = sizeof(struct vxlan_net),
3338 };
3339 
3340 static int __init vxlan_init_module(void)
3341 {
3342         int rc;
3343 
3344         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3345 
3346         rc = register_pernet_subsys(&vxlan_net_ops);
3347         if (rc)
3348                 goto out1;
3349 
3350         rc = register_netdevice_notifier(&vxlan_notifier_block);
3351         if (rc)
3352                 goto out2;
3353 
3354         rc = rtnl_link_register(&vxlan_link_ops);
3355         if (rc)
3356                 goto out3;
3357 
3358         return 0;
3359 out3:
3360         unregister_netdevice_notifier(&vxlan_notifier_block);
3361 out2:
3362         unregister_pernet_subsys(&vxlan_net_ops);
3363 out1:
3364         return rc;
3365 }
3366 late_initcall(vxlan_init_module);
3367 
3368 static void __exit vxlan_cleanup_module(void)
3369 {
3370         rtnl_link_unregister(&vxlan_link_ops);
3371         unregister_netdevice_notifier(&vxlan_notifier_block);
3372         unregister_pernet_subsys(&vxlan_net_ops);
3373         /* rcu_barrier() is called by netns */
3374 }
3375 module_exit(vxlan_cleanup_module);
3376 
3377 MODULE_LICENSE("GPL");
3378 MODULE_VERSION(VXLAN_VERSION);
3379 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3380 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3381 MODULE_ALIAS_RTNL_LINK("vxlan");
3382 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us