Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 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

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/types.h>
 15 #include <linux/module.h>
 16 #include <linux/errno.h>
 17 #include <linux/slab.h>
 18 #include <linux/skbuff.h>
 19 #include <linux/rculist.h>
 20 #include <linux/netdevice.h>
 21 #include <linux/in.h>
 22 #include <linux/ip.h>
 23 #include <linux/udp.h>
 24 #include <linux/igmp.h>
 25 #include <linux/etherdevice.h>
 26 #include <linux/if_ether.h>
 27 #include <linux/if_vlan.h>
 28 #include <linux/hash.h>
 29 #include <linux/ethtool.h>
 30 #include <net/arp.h>
 31 #include <net/ndisc.h>
 32 #include <net/ip.h>
 33 #include <net/ip_tunnels.h>
 34 #include <net/icmp.h>
 35 #include <net/udp.h>
 36 #include <net/udp_tunnel.h>
 37 #include <net/rtnetlink.h>
 38 #include <net/route.h>
 39 #include <net/dsfield.h>
 40 #include <net/inet_ecn.h>
 41 #include <net/net_namespace.h>
 42 #include <net/netns/generic.h>
 43 #include <net/vxlan.h>
 44 #include <net/protocol.h>
 45 
 46 #if IS_ENABLED(CONFIG_IPV6)
 47 #include <net/ipv6.h>
 48 #include <net/addrconf.h>
 49 #include <net/ip6_tunnel.h>
 50 #include <net/ip6_checksum.h>
 51 #endif
 52 #include <net/dst_metadata.h>
 53 
 54 #define VXLAN_VERSION   "0.1"
 55 
 56 #define PORT_HASH_BITS  8
 57 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
 58 #define FDB_AGE_DEFAULT 300 /* 5 min */
 59 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
 60 
 61 /* UDP port for VXLAN traffic.
 62  * The IANA assigned port is 4789, but the Linux default is 8472
 63  * for compatibility with early adopters.
 64  */
 65 static unsigned short vxlan_port __read_mostly = 8472;
 66 module_param_named(udp_port, vxlan_port, ushort, 0444);
 67 MODULE_PARM_DESC(udp_port, "Destination UDP port");
 68 
 69 static bool log_ecn_error = true;
 70 module_param(log_ecn_error, bool, 0644);
 71 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
 72 
 73 static int vxlan_net_id;
 74 static struct rtnl_link_ops vxlan_link_ops;
 75 
 76 static const u8 all_zeros_mac[ETH_ALEN + 2];
 77 
 78 static int vxlan_sock_add(struct vxlan_dev *vxlan);
 79 
 80 /* per-network namespace private data for this module */
 81 struct vxlan_net {
 82         struct list_head  vxlan_list;
 83         struct hlist_head sock_list[PORT_HASH_SIZE];
 84         spinlock_t        sock_lock;
 85 };
 86 
 87 /* Forwarding table entry */
 88 struct vxlan_fdb {
 89         struct hlist_node hlist;        /* linked list of entries */
 90         struct rcu_head   rcu;
 91         unsigned long     updated;      /* jiffies */
 92         unsigned long     used;
 93         struct list_head  remotes;
 94         u8                eth_addr[ETH_ALEN];
 95         u16               state;        /* see ndm_state */
 96         u8                flags;        /* see ndm_flags */
 97 };
 98 
 99 /* salt for hash table */
100 static u32 vxlan_salt __read_mostly;
101 static struct workqueue_struct *vxlan_wq;
102 
103 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
104 {
105         return vs->flags & VXLAN_F_COLLECT_METADATA ||
106                ip_tunnel_collect_metadata();
107 }
108 
109 #if IS_ENABLED(CONFIG_IPV6)
110 static inline
111 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
112 {
113         if (a->sa.sa_family != b->sa.sa_family)
114                 return false;
115         if (a->sa.sa_family == AF_INET6)
116                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
117         else
118                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
119 }
120 
121 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
122 {
123         if (ipa->sa.sa_family == AF_INET6)
124                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
125         else
126                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
127 }
128 
129 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
130 {
131         if (ipa->sa.sa_family == AF_INET6)
132                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
133         else
134                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
135 }
136 
137 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
138 {
139         if (nla_len(nla) >= sizeof(struct in6_addr)) {
140                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
141                 ip->sa.sa_family = AF_INET6;
142                 return 0;
143         } else if (nla_len(nla) >= sizeof(__be32)) {
144                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
145                 ip->sa.sa_family = AF_INET;
146                 return 0;
147         } else {
148                 return -EAFNOSUPPORT;
149         }
150 }
151 
152 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
153                               const union vxlan_addr *ip)
154 {
155         if (ip->sa.sa_family == AF_INET6)
156                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
157         else
158                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
159 }
160 
161 #else /* !CONFIG_IPV6 */
162 
163 static inline
164 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
165 {
166         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
167 }
168 
169 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
170 {
171         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
172 }
173 
174 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
175 {
176         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
177 }
178 
179 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
180 {
181         if (nla_len(nla) >= sizeof(struct in6_addr)) {
182                 return -EAFNOSUPPORT;
183         } else if (nla_len(nla) >= sizeof(__be32)) {
184                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
185                 ip->sa.sa_family = AF_INET;
186                 return 0;
187         } else {
188                 return -EAFNOSUPPORT;
189         }
190 }
191 
192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
193                               const union vxlan_addr *ip)
194 {
195         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
196 }
197 #endif
198 
199 /* Virtual Network hash table head */
200 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
201 {
202         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
203 }
204 
205 /* Socket hash table head */
206 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
207 {
208         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
209 
210         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
211 }
212 
213 /* First remote destination for a forwarding entry.
214  * Guaranteed to be non-NULL because remotes are never deleted.
215  */
216 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
217 {
218         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
219 }
220 
221 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
222 {
223         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
224 }
225 
226 /* Find VXLAN socket based on network namespace, address family and UDP port
227  * and enabled unshareable flags.
228  */
229 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
230                                           __be16 port, u32 flags)
231 {
232         struct vxlan_sock *vs;
233 
234         flags &= VXLAN_F_RCV_FLAGS;
235 
236         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
237                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
238                     vxlan_get_sk_family(vs) == family &&
239                     vs->flags == flags)
240                         return vs;
241         }
242         return NULL;
243 }
244 
245 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
246 {
247         struct vxlan_dev *vxlan;
248 
249         /* For flow based devices, map all packets to VNI 0 */
250         if (vs->flags & VXLAN_F_COLLECT_METADATA)
251                 vni = 0;
252 
253         hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
254                 if (vxlan->default_dst.remote_vni == vni)
255                         return vxlan;
256         }
257 
258         return NULL;
259 }
260 
261 /* Look up VNI in a per net namespace table */
262 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
263                                         sa_family_t family, __be16 port,
264                                         u32 flags)
265 {
266         struct vxlan_sock *vs;
267 
268         vs = vxlan_find_sock(net, family, port, flags);
269         if (!vs)
270                 return NULL;
271 
272         return vxlan_vs_find_vni(vs, vni);
273 }
274 
275 /* Fill in neighbour message in skbuff. */
276 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
277                           const struct vxlan_fdb *fdb,
278                           u32 portid, u32 seq, int type, unsigned int flags,
279                           const struct vxlan_rdst *rdst)
280 {
281         unsigned long now = jiffies;
282         struct nda_cacheinfo ci;
283         struct nlmsghdr *nlh;
284         struct ndmsg *ndm;
285         bool send_ip, send_eth;
286 
287         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
288         if (nlh == NULL)
289                 return -EMSGSIZE;
290 
291         ndm = nlmsg_data(nlh);
292         memset(ndm, 0, sizeof(*ndm));
293 
294         send_eth = send_ip = true;
295 
296         if (type == RTM_GETNEIGH) {
297                 ndm->ndm_family = AF_INET;
298                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
299                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
300         } else
301                 ndm->ndm_family = AF_BRIDGE;
302         ndm->ndm_state = fdb->state;
303         ndm->ndm_ifindex = vxlan->dev->ifindex;
304         ndm->ndm_flags = fdb->flags;
305         ndm->ndm_type = RTN_UNICAST;
306 
307         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
308             nla_put_s32(skb, NDA_LINK_NETNSID,
309                         peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
310                 goto nla_put_failure;
311 
312         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
313                 goto nla_put_failure;
314 
315         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
316                 goto nla_put_failure;
317 
318         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
319             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
320                 goto nla_put_failure;
321         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
322             nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
323                 goto nla_put_failure;
324         if (rdst->remote_ifindex &&
325             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
326                 goto nla_put_failure;
327 
328         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
329         ci.ndm_confirmed = 0;
330         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
331         ci.ndm_refcnt    = 0;
332 
333         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
334                 goto nla_put_failure;
335 
336         nlmsg_end(skb, nlh);
337         return 0;
338 
339 nla_put_failure:
340         nlmsg_cancel(skb, nlh);
341         return -EMSGSIZE;
342 }
343 
344 static inline size_t vxlan_nlmsg_size(void)
345 {
346         return NLMSG_ALIGN(sizeof(struct ndmsg))
347                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
348                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
349                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
350                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
351                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
352                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
353                 + nla_total_size(sizeof(struct nda_cacheinfo));
354 }
355 
356 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
357                              struct vxlan_rdst *rd, int type)
358 {
359         struct net *net = dev_net(vxlan->dev);
360         struct sk_buff *skb;
361         int err = -ENOBUFS;
362 
363         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
364         if (skb == NULL)
365                 goto errout;
366 
367         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
368         if (err < 0) {
369                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
370                 WARN_ON(err == -EMSGSIZE);
371                 kfree_skb(skb);
372                 goto errout;
373         }
374 
375         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
376         return;
377 errout:
378         if (err < 0)
379                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
380 }
381 
382 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
383 {
384         struct vxlan_dev *vxlan = netdev_priv(dev);
385         struct vxlan_fdb f = {
386                 .state = NUD_STALE,
387         };
388         struct vxlan_rdst remote = {
389                 .remote_ip = *ipa, /* goes to NDA_DST */
390                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
391         };
392 
393         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
394 }
395 
396 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
397 {
398         struct vxlan_fdb f = {
399                 .state = NUD_STALE,
400         };
401         struct vxlan_rdst remote = { };
402 
403         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
404 
405         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
406 }
407 
408 /* Hash Ethernet address */
409 static u32 eth_hash(const unsigned char *addr)
410 {
411         u64 value = get_unaligned((u64 *)addr);
412 
413         /* only want 6 bytes */
414 #ifdef __BIG_ENDIAN
415         value >>= 16;
416 #else
417         value <<= 16;
418 #endif
419         return hash_64(value, FDB_HASH_BITS);
420 }
421 
422 /* Hash chain to use given mac address */
423 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
424                                                 const u8 *mac)
425 {
426         return &vxlan->fdb_head[eth_hash(mac)];
427 }
428 
429 /* Look up Ethernet address in forwarding table */
430 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
431                                         const u8 *mac)
432 {
433         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
434         struct vxlan_fdb *f;
435 
436         hlist_for_each_entry_rcu(f, head, hlist) {
437                 if (ether_addr_equal(mac, f->eth_addr))
438                         return f;
439         }
440 
441         return NULL;
442 }
443 
444 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
445                                         const u8 *mac)
446 {
447         struct vxlan_fdb *f;
448 
449         f = __vxlan_find_mac(vxlan, mac);
450         if (f)
451                 f->used = jiffies;
452 
453         return f;
454 }
455 
456 /* caller should hold vxlan->hash_lock */
457 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
458                                               union vxlan_addr *ip, __be16 port,
459                                               __be32 vni, __u32 ifindex)
460 {
461         struct vxlan_rdst *rd;
462 
463         list_for_each_entry(rd, &f->remotes, list) {
464                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
465                     rd->remote_port == port &&
466                     rd->remote_vni == vni &&
467                     rd->remote_ifindex == ifindex)
468                         return rd;
469         }
470 
471         return NULL;
472 }
473 
474 /* Replace destination of unicast mac */
475 static int vxlan_fdb_replace(struct vxlan_fdb *f,
476                              union vxlan_addr *ip, __be16 port, __be32 vni,
477                              __u32 ifindex)
478 {
479         struct vxlan_rdst *rd;
480 
481         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
482         if (rd)
483                 return 0;
484 
485         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
486         if (!rd)
487                 return 0;
488 
489         dst_cache_reset(&rd->dst_cache);
490         rd->remote_ip = *ip;
491         rd->remote_port = port;
492         rd->remote_vni = vni;
493         rd->remote_ifindex = ifindex;
494         return 1;
495 }
496 
497 /* Add/update destinations for multicast */
498 static int vxlan_fdb_append(struct vxlan_fdb *f,
499                             union vxlan_addr *ip, __be16 port, __be32 vni,
500                             __u32 ifindex, struct vxlan_rdst **rdp)
501 {
502         struct vxlan_rdst *rd;
503 
504         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
505         if (rd)
506                 return 0;
507 
508         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
509         if (rd == NULL)
510                 return -ENOBUFS;
511 
512         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
513                 kfree(rd);
514                 return -ENOBUFS;
515         }
516 
517         rd->remote_ip = *ip;
518         rd->remote_port = port;
519         rd->remote_vni = vni;
520         rd->remote_ifindex = ifindex;
521 
522         list_add_tail_rcu(&rd->list, &f->remotes);
523 
524         *rdp = rd;
525         return 1;
526 }
527 
528 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
529                                           unsigned int off,
530                                           struct vxlanhdr *vh, size_t hdrlen,
531                                           __be32 vni_field,
532                                           struct gro_remcsum *grc,
533                                           bool nopartial)
534 {
535         size_t start, offset;
536 
537         if (skb->remcsum_offload)
538                 return vh;
539 
540         if (!NAPI_GRO_CB(skb)->csum_valid)
541                 return NULL;
542 
543         start = vxlan_rco_start(vni_field);
544         offset = start + vxlan_rco_offset(vni_field);
545 
546         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
547                                      start, offset, grc, nopartial);
548 
549         skb->remcsum_offload = 1;
550 
551         return vh;
552 }
553 
554 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
555                                           struct sk_buff *skb,
556                                           struct udp_offload *uoff)
557 {
558         struct sk_buff *p, **pp = NULL;
559         struct vxlanhdr *vh, *vh2;
560         unsigned int hlen, off_vx;
561         int flush = 1;
562         struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
563                                              udp_offloads);
564         __be32 flags;
565         struct gro_remcsum grc;
566 
567         skb_gro_remcsum_init(&grc);
568 
569         off_vx = skb_gro_offset(skb);
570         hlen = off_vx + sizeof(*vh);
571         vh   = skb_gro_header_fast(skb, off_vx);
572         if (skb_gro_header_hard(skb, hlen)) {
573                 vh = skb_gro_header_slow(skb, hlen, off_vx);
574                 if (unlikely(!vh))
575                         goto out;
576         }
577 
578         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
579 
580         flags = vh->vx_flags;
581 
582         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
583                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
584                                        vh->vx_vni, &grc,
585                                        !!(vs->flags &
586                                           VXLAN_F_REMCSUM_NOPARTIAL));
587 
588                 if (!vh)
589                         goto out;
590         }
591 
592         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
593 
594         for (p = *head; p; p = p->next) {
595                 if (!NAPI_GRO_CB(p)->same_flow)
596                         continue;
597 
598                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
599                 if (vh->vx_flags != vh2->vx_flags ||
600                     vh->vx_vni != vh2->vx_vni) {
601                         NAPI_GRO_CB(p)->same_flow = 0;
602                         continue;
603                 }
604         }
605 
606         pp = eth_gro_receive(head, skb);
607         flush = 0;
608 
609 out:
610         skb_gro_remcsum_cleanup(skb, &grc);
611         NAPI_GRO_CB(skb)->flush |= flush;
612 
613         return pp;
614 }
615 
616 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
617                               struct udp_offload *uoff)
618 {
619         /* Sets 'skb->inner_mac_header' since we are always called with
620          * 'skb->encapsulation' set.
621          */
622         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
623 }
624 
625 /* Notify netdevs that UDP port started listening */
626 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
627 {
628         struct net_device *dev;
629         struct sock *sk = vs->sock->sk;
630         struct net *net = sock_net(sk);
631         sa_family_t sa_family = vxlan_get_sk_family(vs);
632         __be16 port = inet_sk(sk)->inet_sport;
633         int err;
634 
635         if (sa_family == AF_INET) {
636                 err = udp_add_offload(net, &vs->udp_offloads);
637                 if (err)
638                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
639         }
640 
641         rcu_read_lock();
642         for_each_netdev_rcu(net, dev) {
643                 if (dev->netdev_ops->ndo_add_vxlan_port)
644                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
645                                                             port);
646         }
647         rcu_read_unlock();
648 }
649 
650 /* Notify netdevs that UDP port is no more listening */
651 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
652 {
653         struct net_device *dev;
654         struct sock *sk = vs->sock->sk;
655         struct net *net = sock_net(sk);
656         sa_family_t sa_family = vxlan_get_sk_family(vs);
657         __be16 port = inet_sk(sk)->inet_sport;
658 
659         rcu_read_lock();
660         for_each_netdev_rcu(net, dev) {
661                 if (dev->netdev_ops->ndo_del_vxlan_port)
662                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
663                                                             port);
664         }
665         rcu_read_unlock();
666 
667         if (sa_family == AF_INET)
668                 udp_del_offload(&vs->udp_offloads);
669 }
670 
671 /* Add new entry to forwarding table -- assumes lock held */
672 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
673                             const u8 *mac, union vxlan_addr *ip,
674                             __u16 state, __u16 flags,
675                             __be16 port, __be32 vni, __u32 ifindex,
676                             __u8 ndm_flags)
677 {
678         struct vxlan_rdst *rd = NULL;
679         struct vxlan_fdb *f;
680         int notify = 0;
681 
682         f = __vxlan_find_mac(vxlan, mac);
683         if (f) {
684                 if (flags & NLM_F_EXCL) {
685                         netdev_dbg(vxlan->dev,
686                                    "lost race to create %pM\n", mac);
687                         return -EEXIST;
688                 }
689                 if (f->state != state) {
690                         f->state = state;
691                         f->updated = jiffies;
692                         notify = 1;
693                 }
694                 if (f->flags != ndm_flags) {
695                         f->flags = ndm_flags;
696                         f->updated = jiffies;
697                         notify = 1;
698                 }
699                 if ((flags & NLM_F_REPLACE)) {
700                         /* Only change unicasts */
701                         if (!(is_multicast_ether_addr(f->eth_addr) ||
702                              is_zero_ether_addr(f->eth_addr))) {
703                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
704                                                            ifindex);
705                         } else
706                                 return -EOPNOTSUPP;
707                 }
708                 if ((flags & NLM_F_APPEND) &&
709                     (is_multicast_ether_addr(f->eth_addr) ||
710                      is_zero_ether_addr(f->eth_addr))) {
711                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
712                                                   &rd);
713 
714                         if (rc < 0)
715                                 return rc;
716                         notify |= rc;
717                 }
718         } else {
719                 if (!(flags & NLM_F_CREATE))
720                         return -ENOENT;
721 
722                 if (vxlan->cfg.addrmax &&
723                     vxlan->addrcnt >= vxlan->cfg.addrmax)
724                         return -ENOSPC;
725 
726                 /* Disallow replace to add a multicast entry */
727                 if ((flags & NLM_F_REPLACE) &&
728                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
729                         return -EOPNOTSUPP;
730 
731                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
732                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
733                 if (!f)
734                         return -ENOMEM;
735 
736                 notify = 1;
737                 f->state = state;
738                 f->flags = ndm_flags;
739                 f->updated = f->used = jiffies;
740                 INIT_LIST_HEAD(&f->remotes);
741                 memcpy(f->eth_addr, mac, ETH_ALEN);
742 
743                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
744 
745                 ++vxlan->addrcnt;
746                 hlist_add_head_rcu(&f->hlist,
747                                    vxlan_fdb_head(vxlan, mac));
748         }
749 
750         if (notify) {
751                 if (rd == NULL)
752                         rd = first_remote_rtnl(f);
753                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
754         }
755 
756         return 0;
757 }
758 
759 static void vxlan_fdb_free(struct rcu_head *head)
760 {
761         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
762         struct vxlan_rdst *rd, *nd;
763 
764         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
765                 dst_cache_destroy(&rd->dst_cache);
766                 kfree(rd);
767         }
768         kfree(f);
769 }
770 
771 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
772 {
773         netdev_dbg(vxlan->dev,
774                     "delete %pM\n", f->eth_addr);
775 
776         --vxlan->addrcnt;
777         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
778 
779         hlist_del_rcu(&f->hlist);
780         call_rcu(&f->rcu, vxlan_fdb_free);
781 }
782 
783 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
784                            union vxlan_addr *ip, __be16 *port, __be32 *vni,
785                            u32 *ifindex)
786 {
787         struct net *net = dev_net(vxlan->dev);
788         int err;
789 
790         if (tb[NDA_DST]) {
791                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
792                 if (err)
793                         return err;
794         } else {
795                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
796                 if (remote->sa.sa_family == AF_INET) {
797                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
798                         ip->sa.sa_family = AF_INET;
799 #if IS_ENABLED(CONFIG_IPV6)
800                 } else {
801                         ip->sin6.sin6_addr = in6addr_any;
802                         ip->sa.sa_family = AF_INET6;
803 #endif
804                 }
805         }
806 
807         if (tb[NDA_PORT]) {
808                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
809                         return -EINVAL;
810                 *port = nla_get_be16(tb[NDA_PORT]);
811         } else {
812                 *port = vxlan->cfg.dst_port;
813         }
814 
815         if (tb[NDA_VNI]) {
816                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
817                         return -EINVAL;
818                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
819         } else {
820                 *vni = vxlan->default_dst.remote_vni;
821         }
822 
823         if (tb[NDA_IFINDEX]) {
824                 struct net_device *tdev;
825 
826                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
827                         return -EINVAL;
828                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
829                 tdev = __dev_get_by_index(net, *ifindex);
830                 if (!tdev)
831                         return -EADDRNOTAVAIL;
832         } else {
833                 *ifindex = 0;
834         }
835 
836         return 0;
837 }
838 
839 /* Add static entry (via netlink) */
840 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
841                          struct net_device *dev,
842                          const unsigned char *addr, u16 vid, u16 flags)
843 {
844         struct vxlan_dev *vxlan = netdev_priv(dev);
845         /* struct net *net = dev_net(vxlan->dev); */
846         union vxlan_addr ip;
847         __be16 port;
848         __be32 vni;
849         u32 ifindex;
850         int err;
851 
852         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
853                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
854                         ndm->ndm_state);
855                 return -EINVAL;
856         }
857 
858         if (tb[NDA_DST] == NULL)
859                 return -EINVAL;
860 
861         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
862         if (err)
863                 return err;
864 
865         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
866                 return -EAFNOSUPPORT;
867 
868         spin_lock_bh(&vxlan->hash_lock);
869         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
870                                port, vni, ifindex, ndm->ndm_flags);
871         spin_unlock_bh(&vxlan->hash_lock);
872 
873         return err;
874 }
875 
876 /* Delete entry (via netlink) */
877 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
878                             struct net_device *dev,
879                             const unsigned char *addr, u16 vid)
880 {
881         struct vxlan_dev *vxlan = netdev_priv(dev);
882         struct vxlan_fdb *f;
883         struct vxlan_rdst *rd = NULL;
884         union vxlan_addr ip;
885         __be16 port;
886         __be32 vni;
887         u32 ifindex;
888         int err;
889 
890         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
891         if (err)
892                 return err;
893 
894         err = -ENOENT;
895 
896         spin_lock_bh(&vxlan->hash_lock);
897         f = vxlan_find_mac(vxlan, addr);
898         if (!f)
899                 goto out;
900 
901         if (!vxlan_addr_any(&ip)) {
902                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
903                 if (!rd)
904                         goto out;
905         }
906 
907         err = 0;
908 
909         /* remove a destination if it's not the only one on the list,
910          * otherwise destroy the fdb entry
911          */
912         if (rd && !list_is_singular(&f->remotes)) {
913                 list_del_rcu(&rd->list);
914                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
915                 kfree_rcu(rd, rcu);
916                 goto out;
917         }
918 
919         vxlan_fdb_destroy(vxlan, f);
920 
921 out:
922         spin_unlock_bh(&vxlan->hash_lock);
923 
924         return err;
925 }
926 
927 /* Dump forwarding table */
928 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
929                           struct net_device *dev,
930                           struct net_device *filter_dev, int idx)
931 {
932         struct vxlan_dev *vxlan = netdev_priv(dev);
933         unsigned int h;
934 
935         for (h = 0; h < FDB_HASH_SIZE; ++h) {
936                 struct vxlan_fdb *f;
937                 int err;
938 
939                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
940                         struct vxlan_rdst *rd;
941 
942                         list_for_each_entry_rcu(rd, &f->remotes, list) {
943                                 if (idx < cb->args[0])
944                                         goto skip;
945 
946                                 err = vxlan_fdb_info(skb, vxlan, f,
947                                                      NETLINK_CB(cb->skb).portid,
948                                                      cb->nlh->nlmsg_seq,
949                                                      RTM_NEWNEIGH,
950                                                      NLM_F_MULTI, rd);
951                                 if (err < 0) {
952                                         cb->args[1] = err;
953                                         goto out;
954                                 }
955 skip:
956                                 ++idx;
957                         }
958                 }
959         }
960 out:
961         return idx;
962 }
963 
964 /* Watch incoming packets to learn mapping between Ethernet address
965  * and Tunnel endpoint.
966  * Return true if packet is bogus and should be dropped.
967  */
968 static bool vxlan_snoop(struct net_device *dev,
969                         union vxlan_addr *src_ip, const u8 *src_mac)
970 {
971         struct vxlan_dev *vxlan = netdev_priv(dev);
972         struct vxlan_fdb *f;
973 
974         f = vxlan_find_mac(vxlan, src_mac);
975         if (likely(f)) {
976                 struct vxlan_rdst *rdst = first_remote_rcu(f);
977 
978                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
979                         return false;
980 
981                 /* Don't migrate static entries, drop packets */
982                 if (f->state & NUD_NOARP)
983                         return true;
984 
985                 if (net_ratelimit())
986                         netdev_info(dev,
987                                     "%pM migrated from %pIS to %pIS\n",
988                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
989 
990                 rdst->remote_ip = *src_ip;
991                 f->updated = jiffies;
992                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
993         } else {
994                 /* learned new entry */
995                 spin_lock(&vxlan->hash_lock);
996 
997                 /* close off race between vxlan_flush and incoming packets */
998                 if (netif_running(dev))
999                         vxlan_fdb_create(vxlan, src_mac, src_ip,
1000                                          NUD_REACHABLE,
1001                                          NLM_F_EXCL|NLM_F_CREATE,
1002                                          vxlan->cfg.dst_port,
1003                                          vxlan->default_dst.remote_vni,
1004                                          0, NTF_SELF);
1005                 spin_unlock(&vxlan->hash_lock);
1006         }
1007 
1008         return false;
1009 }
1010 
1011 /* See if multicast group is already in use by other ID */
1012 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1013 {
1014         struct vxlan_dev *vxlan;
1015         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1016 
1017         /* The vxlan_sock is only used by dev, leaving group has
1018          * no effect on other vxlan devices.
1019          */
1020         if (family == AF_INET && dev->vn4_sock &&
1021             atomic_read(&dev->vn4_sock->refcnt) == 1)
1022                 return false;
1023 #if IS_ENABLED(CONFIG_IPV6)
1024         if (family == AF_INET6 && dev->vn6_sock &&
1025             atomic_read(&dev->vn6_sock->refcnt) == 1)
1026                 return false;
1027 #endif
1028 
1029         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1030                 if (!netif_running(vxlan->dev) || vxlan == dev)
1031                         continue;
1032 
1033                 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1034                         continue;
1035 #if IS_ENABLED(CONFIG_IPV6)
1036                 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1037                         continue;
1038 #endif
1039 
1040                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1041                                       &dev->default_dst.remote_ip))
1042                         continue;
1043 
1044                 if (vxlan->default_dst.remote_ifindex !=
1045                     dev->default_dst.remote_ifindex)
1046                         continue;
1047 
1048                 return true;
1049         }
1050 
1051         return false;
1052 }
1053 
1054 static void __vxlan_sock_release(struct vxlan_sock *vs)
1055 {
1056         struct vxlan_net *vn;
1057 
1058         if (!vs)
1059                 return;
1060         if (!atomic_dec_and_test(&vs->refcnt))
1061                 return;
1062 
1063         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1064         spin_lock(&vn->sock_lock);
1065         hlist_del_rcu(&vs->hlist);
1066         vxlan_notify_del_rx_port(vs);
1067         spin_unlock(&vn->sock_lock);
1068 
1069         queue_work(vxlan_wq, &vs->del_work);
1070 }
1071 
1072 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1073 {
1074         __vxlan_sock_release(vxlan->vn4_sock);
1075 #if IS_ENABLED(CONFIG_IPV6)
1076         __vxlan_sock_release(vxlan->vn6_sock);
1077 #endif
1078 }
1079 
1080 /* Update multicast group membership when first VNI on
1081  * multicast address is brought up
1082  */
1083 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1084 {
1085         struct sock *sk;
1086         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1087         int ifindex = vxlan->default_dst.remote_ifindex;
1088         int ret = -EINVAL;
1089 
1090         if (ip->sa.sa_family == AF_INET) {
1091                 struct ip_mreqn mreq = {
1092                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1093                         .imr_ifindex            = ifindex,
1094                 };
1095 
1096                 sk = vxlan->vn4_sock->sock->sk;
1097                 lock_sock(sk);
1098                 ret = ip_mc_join_group(sk, &mreq);
1099                 release_sock(sk);
1100 #if IS_ENABLED(CONFIG_IPV6)
1101         } else {
1102                 sk = vxlan->vn6_sock->sock->sk;
1103                 lock_sock(sk);
1104                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1105                                                    &ip->sin6.sin6_addr);
1106                 release_sock(sk);
1107 #endif
1108         }
1109 
1110         return ret;
1111 }
1112 
1113 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1114 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1115 {
1116         struct sock *sk;
1117         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1118         int ifindex = vxlan->default_dst.remote_ifindex;
1119         int ret = -EINVAL;
1120 
1121         if (ip->sa.sa_family == AF_INET) {
1122                 struct ip_mreqn mreq = {
1123                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1124                         .imr_ifindex            = ifindex,
1125                 };
1126 
1127                 sk = vxlan->vn4_sock->sock->sk;
1128                 lock_sock(sk);
1129                 ret = ip_mc_leave_group(sk, &mreq);
1130                 release_sock(sk);
1131 #if IS_ENABLED(CONFIG_IPV6)
1132         } else {
1133                 sk = vxlan->vn6_sock->sock->sk;
1134                 lock_sock(sk);
1135                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1136                                                    &ip->sin6.sin6_addr);
1137                 release_sock(sk);
1138 #endif
1139         }
1140 
1141         return ret;
1142 }
1143 
1144 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1145                           struct sk_buff *skb, u32 vxflags)
1146 {
1147         size_t start, offset;
1148 
1149         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1150                 goto out;
1151 
1152         start = vxlan_rco_start(unparsed->vx_vni);
1153         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1154 
1155         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1156                 return false;
1157 
1158         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1159                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1160 out:
1161         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1162         unparsed->vx_vni &= VXLAN_VNI_MASK;
1163         return true;
1164 }
1165 
1166 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1167                                 struct sk_buff *skb, u32 vxflags,
1168                                 struct vxlan_metadata *md)
1169 {
1170         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1171         struct metadata_dst *tun_dst;
1172 
1173         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1174                 goto out;
1175 
1176         md->gbp = ntohs(gbp->policy_id);
1177 
1178         tun_dst = (struct metadata_dst *)skb_dst(skb);
1179         if (tun_dst) {
1180                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1181                 tun_dst->u.tun_info.options_len = sizeof(*md);
1182         }
1183         if (gbp->dont_learn)
1184                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1185 
1186         if (gbp->policy_applied)
1187                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1188 
1189         /* In flow-based mode, GBP is carried in dst_metadata */
1190         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1191                 skb->mark = md->gbp;
1192 out:
1193         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1194 }
1195 
1196 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1197                           struct vxlan_sock *vs,
1198                           struct sk_buff *skb)
1199 {
1200         union vxlan_addr saddr;
1201 
1202         skb_reset_mac_header(skb);
1203         skb->protocol = eth_type_trans(skb, vxlan->dev);
1204         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1205 
1206         /* Ignore packet loops (and multicast echo) */
1207         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1208                 return false;
1209 
1210         /* Get address from the outer IP header */
1211         if (vxlan_get_sk_family(vs) == AF_INET) {
1212                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1213                 saddr.sa.sa_family = AF_INET;
1214 #if IS_ENABLED(CONFIG_IPV6)
1215         } else {
1216                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1217                 saddr.sa.sa_family = AF_INET6;
1218 #endif
1219         }
1220 
1221         if ((vxlan->flags & VXLAN_F_LEARN) &&
1222             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1223                 return false;
1224 
1225         return true;
1226 }
1227 
1228 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1229                                   struct sk_buff *skb)
1230 {
1231         int err = 0;
1232 
1233         if (vxlan_get_sk_family(vs) == AF_INET)
1234                 err = IP_ECN_decapsulate(oiph, skb);
1235 #if IS_ENABLED(CONFIG_IPV6)
1236         else
1237                 err = IP6_ECN_decapsulate(oiph, skb);
1238 #endif
1239 
1240         if (unlikely(err) && log_ecn_error) {
1241                 if (vxlan_get_sk_family(vs) == AF_INET)
1242                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1243                                              &((struct iphdr *)oiph)->saddr,
1244                                              ((struct iphdr *)oiph)->tos);
1245                 else
1246                         net_info_ratelimited("non-ECT from %pI6\n",
1247                                              &((struct ipv6hdr *)oiph)->saddr);
1248         }
1249         return err <= 1;
1250 }
1251 
1252 /* Callback from net/ipv4/udp.c to receive packets */
1253 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1254 {
1255         struct pcpu_sw_netstats *stats;
1256         struct vxlan_dev *vxlan;
1257         struct vxlan_sock *vs;
1258         struct vxlanhdr unparsed;
1259         struct vxlan_metadata _md;
1260         struct vxlan_metadata *md = &_md;
1261         void *oiph;
1262 
1263         /* Need Vxlan and inner Ethernet header to be present */
1264         if (!pskb_may_pull(skb, VXLAN_HLEN))
1265                 return 1;
1266 
1267         unparsed = *vxlan_hdr(skb);
1268         /* VNI flag always required to be set */
1269         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1270                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1271                            ntohl(vxlan_hdr(skb)->vx_flags),
1272                            ntohl(vxlan_hdr(skb)->vx_vni));
1273                 /* Return non vxlan pkt */
1274                 return 1;
1275         }
1276         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1277         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1278 
1279         vs = rcu_dereference_sk_user_data(sk);
1280         if (!vs)
1281                 goto drop;
1282 
1283         vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1284         if (!vxlan)
1285                 goto drop;
1286 
1287         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB),
1288                                  !net_eq(vxlan->net, dev_net(vxlan->dev))))
1289                 goto drop;
1290 
1291         if (vxlan_collect_metadata(vs)) {
1292                 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1293                 struct metadata_dst *tun_dst;
1294 
1295                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1296                                          vxlan_vni_to_tun_id(vni), sizeof(*md));
1297 
1298                 if (!tun_dst)
1299                         goto drop;
1300 
1301                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1302 
1303                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1304         } else {
1305                 memset(md, 0, sizeof(*md));
1306         }
1307 
1308         /* For backwards compatibility, only allow reserved fields to be
1309          * used by VXLAN extensions if explicitly requested.
1310          */
1311         if (vs->flags & VXLAN_F_REMCSUM_RX)
1312                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1313                         goto drop;
1314         if (vs->flags & VXLAN_F_GBP)
1315                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1316 
1317         if (unparsed.vx_flags || unparsed.vx_vni) {
1318                 /* If there are any unprocessed flags remaining treat
1319                  * this as a malformed packet. This behavior diverges from
1320                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1321                  * in reserved fields are to be ignored. The approach here
1322                  * maintains compatibility with previous stack code, and also
1323                  * is more robust and provides a little more security in
1324                  * adding extensions to VXLAN.
1325                  */
1326                 goto drop;
1327         }
1328 
1329         if (!vxlan_set_mac(vxlan, vs, skb))
1330                 goto drop;
1331 
1332         oiph = skb_network_header(skb);
1333         skb_reset_network_header(skb);
1334 
1335         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1336                 ++vxlan->dev->stats.rx_frame_errors;
1337                 ++vxlan->dev->stats.rx_errors;
1338                 goto drop;
1339         }
1340 
1341         stats = this_cpu_ptr(vxlan->dev->tstats);
1342         u64_stats_update_begin(&stats->syncp);
1343         stats->rx_packets++;
1344         stats->rx_bytes += skb->len;
1345         u64_stats_update_end(&stats->syncp);
1346 
1347         gro_cells_receive(&vxlan->gro_cells, skb);
1348         return 0;
1349 
1350 drop:
1351         /* Consume bad packet */
1352         kfree_skb(skb);
1353         return 0;
1354 }
1355 
1356 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1357 {
1358         struct vxlan_dev *vxlan = netdev_priv(dev);
1359         struct arphdr *parp;
1360         u8 *arpptr, *sha;
1361         __be32 sip, tip;
1362         struct neighbour *n;
1363 
1364         if (dev->flags & IFF_NOARP)
1365                 goto out;
1366 
1367         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1368                 dev->stats.tx_dropped++;
1369                 goto out;
1370         }
1371         parp = arp_hdr(skb);
1372 
1373         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1374              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1375             parp->ar_pro != htons(ETH_P_IP) ||
1376             parp->ar_op != htons(ARPOP_REQUEST) ||
1377             parp->ar_hln != dev->addr_len ||
1378             parp->ar_pln != 4)
1379                 goto out;
1380         arpptr = (u8 *)parp + sizeof(struct arphdr);
1381         sha = arpptr;
1382         arpptr += dev->addr_len;        /* sha */
1383         memcpy(&sip, arpptr, sizeof(sip));
1384         arpptr += sizeof(sip);
1385         arpptr += dev->addr_len;        /* tha */
1386         memcpy(&tip, arpptr, sizeof(tip));
1387 
1388         if (ipv4_is_loopback(tip) ||
1389             ipv4_is_multicast(tip))
1390                 goto out;
1391 
1392         n = neigh_lookup(&arp_tbl, &tip, dev);
1393 
1394         if (n) {
1395                 struct vxlan_fdb *f;
1396                 struct sk_buff  *reply;
1397 
1398                 if (!(n->nud_state & NUD_CONNECTED)) {
1399                         neigh_release(n);
1400                         goto out;
1401                 }
1402 
1403                 f = vxlan_find_mac(vxlan, n->ha);
1404                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1405                         /* bridge-local neighbor */
1406                         neigh_release(n);
1407                         goto out;
1408                 }
1409 
1410                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1411                                 n->ha, sha);
1412 
1413                 neigh_release(n);
1414 
1415                 if (reply == NULL)
1416                         goto out;
1417 
1418                 skb_reset_mac_header(reply);
1419                 __skb_pull(reply, skb_network_offset(reply));
1420                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1421                 reply->pkt_type = PACKET_HOST;
1422 
1423                 if (netif_rx_ni(reply) == NET_RX_DROP)
1424                         dev->stats.rx_dropped++;
1425         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1426                 union vxlan_addr ipa = {
1427                         .sin.sin_addr.s_addr = tip,
1428                         .sin.sin_family = AF_INET,
1429                 };
1430 
1431                 vxlan_ip_miss(dev, &ipa);
1432         }
1433 out:
1434         consume_skb(skb);
1435         return NETDEV_TX_OK;
1436 }
1437 
1438 #if IS_ENABLED(CONFIG_IPV6)
1439 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1440         struct neighbour *n, bool isrouter)
1441 {
1442         struct net_device *dev = request->dev;
1443         struct sk_buff *reply;
1444         struct nd_msg *ns, *na;
1445         struct ipv6hdr *pip6;
1446         u8 *daddr;
1447         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1448         int ns_olen;
1449         int i, len;
1450 
1451         if (dev == NULL)
1452                 return NULL;
1453 
1454         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1455                 sizeof(*na) + na_olen + dev->needed_tailroom;
1456         reply = alloc_skb(len, GFP_ATOMIC);
1457         if (reply == NULL)
1458                 return NULL;
1459 
1460         reply->protocol = htons(ETH_P_IPV6);
1461         reply->dev = dev;
1462         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1463         skb_push(reply, sizeof(struct ethhdr));
1464         skb_reset_mac_header(reply);
1465 
1466         ns = (struct nd_msg *)skb_transport_header(request);
1467 
1468         daddr = eth_hdr(request)->h_source;
1469         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1470         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1471                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1472                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1473                         break;
1474                 }
1475         }
1476 
1477         /* Ethernet header */
1478         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1479         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1480         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1481         reply->protocol = htons(ETH_P_IPV6);
1482 
1483         skb_pull(reply, sizeof(struct ethhdr));
1484         skb_reset_network_header(reply);
1485         skb_put(reply, sizeof(struct ipv6hdr));
1486 
1487         /* IPv6 header */
1488 
1489         pip6 = ipv6_hdr(reply);
1490         memset(pip6, 0, sizeof(struct ipv6hdr));
1491         pip6->version = 6;
1492         pip6->priority = ipv6_hdr(request)->priority;
1493         pip6->nexthdr = IPPROTO_ICMPV6;
1494         pip6->hop_limit = 255;
1495         pip6->daddr = ipv6_hdr(request)->saddr;
1496         pip6->saddr = *(struct in6_addr *)n->primary_key;
1497 
1498         skb_pull(reply, sizeof(struct ipv6hdr));
1499         skb_reset_transport_header(reply);
1500 
1501         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1502 
1503         /* Neighbor Advertisement */
1504         memset(na, 0, sizeof(*na)+na_olen);
1505         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1506         na->icmph.icmp6_router = isrouter;
1507         na->icmph.icmp6_override = 1;
1508         na->icmph.icmp6_solicited = 1;
1509         na->target = ns->target;
1510         ether_addr_copy(&na->opt[2], n->ha);
1511         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1512         na->opt[1] = na_olen >> 3;
1513 
1514         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1515                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1516                 csum_partial(na, sizeof(*na)+na_olen, 0));
1517 
1518         pip6->payload_len = htons(sizeof(*na)+na_olen);
1519 
1520         skb_push(reply, sizeof(struct ipv6hdr));
1521 
1522         reply->ip_summed = CHECKSUM_UNNECESSARY;
1523 
1524         return reply;
1525 }
1526 
1527 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1528 {
1529         struct vxlan_dev *vxlan = netdev_priv(dev);
1530         struct nd_msg *msg;
1531         const struct ipv6hdr *iphdr;
1532         const struct in6_addr *saddr, *daddr;
1533         struct neighbour *n;
1534         struct inet6_dev *in6_dev;
1535 
1536         in6_dev = __in6_dev_get(dev);
1537         if (!in6_dev)
1538                 goto out;
1539 
1540         iphdr = ipv6_hdr(skb);
1541         saddr = &iphdr->saddr;
1542         daddr = &iphdr->daddr;
1543 
1544         msg = (struct nd_msg *)skb_transport_header(skb);
1545         if (msg->icmph.icmp6_code != 0 ||
1546             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1547                 goto out;
1548 
1549         if (ipv6_addr_loopback(daddr) ||
1550             ipv6_addr_is_multicast(&msg->target))
1551                 goto out;
1552 
1553         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1554 
1555         if (n) {
1556                 struct vxlan_fdb *f;
1557                 struct sk_buff *reply;
1558 
1559                 if (!(n->nud_state & NUD_CONNECTED)) {
1560                         neigh_release(n);
1561                         goto out;
1562                 }
1563 
1564                 f = vxlan_find_mac(vxlan, n->ha);
1565                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1566                         /* bridge-local neighbor */
1567                         neigh_release(n);
1568                         goto out;
1569                 }
1570 
1571                 reply = vxlan_na_create(skb, n,
1572                                         !!(f ? f->flags & NTF_ROUTER : 0));
1573 
1574                 neigh_release(n);
1575 
1576                 if (reply == NULL)
1577                         goto out;
1578 
1579                 if (netif_rx_ni(reply) == NET_RX_DROP)
1580                         dev->stats.rx_dropped++;
1581 
1582         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1583                 union vxlan_addr ipa = {
1584                         .sin6.sin6_addr = msg->target,
1585                         .sin6.sin6_family = AF_INET6,
1586                 };
1587 
1588                 vxlan_ip_miss(dev, &ipa);
1589         }
1590 
1591 out:
1592         consume_skb(skb);
1593         return NETDEV_TX_OK;
1594 }
1595 #endif
1596 
1597 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1598 {
1599         struct vxlan_dev *vxlan = netdev_priv(dev);
1600         struct neighbour *n;
1601 
1602         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1603                 return false;
1604 
1605         n = NULL;
1606         switch (ntohs(eth_hdr(skb)->h_proto)) {
1607         case ETH_P_IP:
1608         {
1609                 struct iphdr *pip;
1610 
1611                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1612                         return false;
1613                 pip = ip_hdr(skb);
1614                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1615                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1616                         union vxlan_addr ipa = {
1617                                 .sin.sin_addr.s_addr = pip->daddr,
1618                                 .sin.sin_family = AF_INET,
1619                         };
1620 
1621                         vxlan_ip_miss(dev, &ipa);
1622                         return false;
1623                 }
1624 
1625                 break;
1626         }
1627 #if IS_ENABLED(CONFIG_IPV6)
1628         case ETH_P_IPV6:
1629         {
1630                 struct ipv6hdr *pip6;
1631 
1632                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1633                         return false;
1634                 pip6 = ipv6_hdr(skb);
1635                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1636                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1637                         union vxlan_addr ipa = {
1638                                 .sin6.sin6_addr = pip6->daddr,
1639                                 .sin6.sin6_family = AF_INET6,
1640                         };
1641 
1642                         vxlan_ip_miss(dev, &ipa);
1643                         return false;
1644                 }
1645 
1646                 break;
1647         }
1648 #endif
1649         default:
1650                 return false;
1651         }
1652 
1653         if (n) {
1654                 bool diff;
1655 
1656                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1657                 if (diff) {
1658                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1659                                 dev->addr_len);
1660                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1661                 }
1662                 neigh_release(n);
1663                 return diff;
1664         }
1665 
1666         return false;
1667 }
1668 
1669 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1670                                 struct vxlan_metadata *md)
1671 {
1672         struct vxlanhdr_gbp *gbp;
1673 
1674         if (!md->gbp)
1675                 return;
1676 
1677         gbp = (struct vxlanhdr_gbp *)vxh;
1678         vxh->vx_flags |= VXLAN_HF_GBP;
1679 
1680         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1681                 gbp->dont_learn = 1;
1682 
1683         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1684                 gbp->policy_applied = 1;
1685 
1686         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1687 }
1688 
1689 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1690                            int iphdr_len, __be32 vni,
1691                            struct vxlan_metadata *md, u32 vxflags,
1692                            bool udp_sum)
1693 {
1694         struct vxlanhdr *vxh;
1695         int min_headroom;
1696         int err;
1697         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1698 
1699         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1700             skb->ip_summed == CHECKSUM_PARTIAL) {
1701                 int csum_start = skb_checksum_start_offset(skb);
1702 
1703                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1704                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1705                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1706                      skb->csum_offset == offsetof(struct tcphdr, check)))
1707                         type |= SKB_GSO_TUNNEL_REMCSUM;
1708         }
1709 
1710         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1711                         + VXLAN_HLEN + iphdr_len
1712                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1713 
1714         /* Need space for new headers (invalidates iph ptr) */
1715         err = skb_cow_head(skb, min_headroom);
1716         if (unlikely(err)) {
1717                 kfree_skb(skb);
1718                 return err;
1719         }
1720 
1721         skb = vlan_hwaccel_push_inside(skb);
1722         if (WARN_ON(!skb))
1723                 return -ENOMEM;
1724 
1725         skb = iptunnel_handle_offloads(skb, type);
1726         if (IS_ERR(skb))
1727                 return PTR_ERR(skb);
1728 
1729         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1730         vxh->vx_flags = VXLAN_HF_VNI;
1731         vxh->vx_vni = vxlan_vni_field(vni);
1732 
1733         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1734                 unsigned int start;
1735 
1736                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1737                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1738                 vxh->vx_flags |= VXLAN_HF_RCO;
1739 
1740                 if (!skb_is_gso(skb)) {
1741                         skb->ip_summed = CHECKSUM_NONE;
1742                         skb->encapsulation = 0;
1743                 }
1744         }
1745 
1746         if (vxflags & VXLAN_F_GBP)
1747                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1748 
1749         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1750         return 0;
1751 }
1752 
1753 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1754                                       struct sk_buff *skb, int oif, u8 tos,
1755                                       __be32 daddr, __be32 *saddr,
1756                                       struct dst_cache *dst_cache,
1757                                       const struct ip_tunnel_info *info)
1758 {
1759         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1760         struct rtable *rt = NULL;
1761         struct flowi4 fl4;
1762 
1763         if (tos && !info)
1764                 use_cache = false;
1765         if (use_cache) {
1766                 rt = dst_cache_get_ip4(dst_cache, saddr);
1767                 if (rt)
1768                         return rt;
1769         }
1770 
1771         memset(&fl4, 0, sizeof(fl4));
1772         fl4.flowi4_oif = oif;
1773         fl4.flowi4_tos = RT_TOS(tos);
1774         fl4.flowi4_mark = skb->mark;
1775         fl4.flowi4_proto = IPPROTO_UDP;
1776         fl4.daddr = daddr;
1777         fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1778 
1779         rt = ip_route_output_key(vxlan->net, &fl4);
1780         if (!IS_ERR(rt)) {
1781                 *saddr = fl4.saddr;
1782                 if (use_cache)
1783                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1784         }
1785         return rt;
1786 }
1787 
1788 #if IS_ENABLED(CONFIG_IPV6)
1789 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1790                                           struct sk_buff *skb, int oif, u8 tos,
1791                                           __be32 label,
1792                                           const struct in6_addr *daddr,
1793                                           struct in6_addr *saddr,
1794                                           struct dst_cache *dst_cache,
1795                                           const struct ip_tunnel_info *info)
1796 {
1797         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1798         struct dst_entry *ndst;
1799         struct flowi6 fl6;
1800         int err;
1801 
1802         if (tos && !info)
1803                 use_cache = false;
1804         if (use_cache) {
1805                 ndst = dst_cache_get_ip6(dst_cache, saddr);
1806                 if (ndst)
1807                         return ndst;
1808         }
1809 
1810         memset(&fl6, 0, sizeof(fl6));
1811         fl6.flowi6_oif = oif;
1812         fl6.daddr = *daddr;
1813         fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1814         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1815         fl6.flowi6_mark = skb->mark;
1816         fl6.flowi6_proto = IPPROTO_UDP;
1817 
1818         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1819                                          vxlan->vn6_sock->sock->sk,
1820                                          &ndst, &fl6);
1821         if (err < 0)
1822                 return ERR_PTR(err);
1823 
1824         *saddr = fl6.saddr;
1825         if (use_cache)
1826                 dst_cache_set_ip6(dst_cache, ndst, saddr);
1827         return ndst;
1828 }
1829 #endif
1830 
1831 /* Bypass encapsulation if the destination is local */
1832 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1833                                struct vxlan_dev *dst_vxlan)
1834 {
1835         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1836         union vxlan_addr loopback;
1837         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1838         struct net_device *dev = skb->dev;
1839         int len = skb->len;
1840 
1841         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1842         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1843         skb->pkt_type = PACKET_HOST;
1844         skb->encapsulation = 0;
1845         skb->dev = dst_vxlan->dev;
1846         __skb_pull(skb, skb_network_offset(skb));
1847 
1848         if (remote_ip->sa.sa_family == AF_INET) {
1849                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1850                 loopback.sa.sa_family =  AF_INET;
1851 #if IS_ENABLED(CONFIG_IPV6)
1852         } else {
1853                 loopback.sin6.sin6_addr = in6addr_loopback;
1854                 loopback.sa.sa_family =  AF_INET6;
1855 #endif
1856         }
1857 
1858         if (dst_vxlan->flags & VXLAN_F_LEARN)
1859                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1860 
1861         u64_stats_update_begin(&tx_stats->syncp);
1862         tx_stats->tx_packets++;
1863         tx_stats->tx_bytes += len;
1864         u64_stats_update_end(&tx_stats->syncp);
1865 
1866         if (netif_rx(skb) == NET_RX_SUCCESS) {
1867                 u64_stats_update_begin(&rx_stats->syncp);
1868                 rx_stats->rx_packets++;
1869                 rx_stats->rx_bytes += len;
1870                 u64_stats_update_end(&rx_stats->syncp);
1871         } else {
1872                 dev->stats.rx_dropped++;
1873         }
1874 }
1875 
1876 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1877                            struct vxlan_rdst *rdst, bool did_rsc)
1878 {
1879         struct dst_cache *dst_cache;
1880         struct ip_tunnel_info *info;
1881         struct vxlan_dev *vxlan = netdev_priv(dev);
1882         struct sock *sk;
1883         struct rtable *rt = NULL;
1884         const struct iphdr *old_iph;
1885         union vxlan_addr *dst;
1886         union vxlan_addr remote_ip;
1887         struct vxlan_metadata _md;
1888         struct vxlan_metadata *md = &_md;
1889         __be16 src_port = 0, dst_port;
1890         __be32 vni, label;
1891         __be16 df = 0;
1892         __u8 tos, ttl;
1893         int err;
1894         u32 flags = vxlan->flags;
1895         bool udp_sum = false;
1896         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1897 
1898         info = skb_tunnel_info(skb);
1899 
1900         if (rdst) {
1901                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1902                 vni = rdst->remote_vni;
1903                 dst = &rdst->remote_ip;
1904                 dst_cache = &rdst->dst_cache;
1905         } else {
1906                 if (!info) {
1907                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1908                                   dev->name);
1909                         goto drop;
1910                 }
1911                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1912                 vni = vxlan_tun_id_to_vni(info->key.tun_id);
1913                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1914                 if (remote_ip.sa.sa_family == AF_INET)
1915                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1916                 else
1917                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1918                 dst = &remote_ip;
1919                 dst_cache = &info->dst_cache;
1920         }
1921 
1922         if (vxlan_addr_any(dst)) {
1923                 if (did_rsc) {
1924                         /* short-circuited back to local bridge */
1925                         vxlan_encap_bypass(skb, vxlan, vxlan);
1926                         return;
1927                 }
1928                 goto drop;
1929         }
1930 
1931         old_iph = ip_hdr(skb);
1932 
1933         ttl = vxlan->cfg.ttl;
1934         if (!ttl && vxlan_addr_multicast(dst))
1935                 ttl = 1;
1936 
1937         tos = vxlan->cfg.tos;
1938         if (tos == 1)
1939                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1940 
1941         label = vxlan->cfg.label;
1942         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1943                                      vxlan->cfg.port_max, true);
1944 
1945         if (info) {
1946                 ttl = info->key.ttl;
1947                 tos = info->key.tos;
1948                 label = info->key.label;
1949                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
1950 
1951                 if (info->options_len)
1952                         md = ip_tunnel_info_opts(info);
1953         } else {
1954                 md->gbp = skb->mark;
1955         }
1956 
1957         if (dst->sa.sa_family == AF_INET) {
1958                 __be32 saddr;
1959 
1960                 if (!vxlan->vn4_sock)
1961                         goto drop;
1962                 sk = vxlan->vn4_sock->sock->sk;
1963 
1964                 rt = vxlan_get_route(vxlan, skb,
1965                                      rdst ? rdst->remote_ifindex : 0, tos,
1966                                      dst->sin.sin_addr.s_addr, &saddr,
1967                                      dst_cache, info);
1968                 if (IS_ERR(rt)) {
1969                         netdev_dbg(dev, "no route to %pI4\n",
1970                                    &dst->sin.sin_addr.s_addr);
1971                         dev->stats.tx_carrier_errors++;
1972                         goto tx_error;
1973                 }
1974 
1975                 if (rt->dst.dev == dev) {
1976                         netdev_dbg(dev, "circular route to %pI4\n",
1977                                    &dst->sin.sin_addr.s_addr);
1978                         dev->stats.collisions++;
1979                         goto rt_tx_error;
1980                 }
1981 
1982                 /* Bypass encapsulation if the destination is local */
1983                 if (rt->rt_flags & RTCF_LOCAL &&
1984                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1985                         struct vxlan_dev *dst_vxlan;
1986 
1987                         ip_rt_put(rt);
1988                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1989                                                    dst->sa.sa_family, dst_port,
1990                                                    vxlan->flags);
1991                         if (!dst_vxlan)
1992                                 goto tx_error;
1993                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1994                         return;
1995                 }
1996 
1997                 if (!info)
1998                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
1999                 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2000                         df = htons(IP_DF);
2001 
2002                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2003                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2004                 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2005                                       vni, md, flags, udp_sum);
2006                 if (err < 0)
2007                         goto xmit_tx_error;
2008 
2009                 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2010                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2011                                     src_port, dst_port, xnet, !udp_sum);
2012 #if IS_ENABLED(CONFIG_IPV6)
2013         } else {
2014                 struct dst_entry *ndst;
2015                 struct in6_addr saddr;
2016                 u32 rt6i_flags;
2017 
2018                 if (!vxlan->vn6_sock)
2019                         goto drop;
2020                 sk = vxlan->vn6_sock->sock->sk;
2021 
2022                 ndst = vxlan6_get_route(vxlan, skb,
2023                                         rdst ? rdst->remote_ifindex : 0, tos,
2024                                         label, &dst->sin6.sin6_addr, &saddr,
2025                                         dst_cache, info);
2026                 if (IS_ERR(ndst)) {
2027                         netdev_dbg(dev, "no route to %pI6\n",
2028                                    &dst->sin6.sin6_addr);
2029                         dev->stats.tx_carrier_errors++;
2030                         goto tx_error;
2031                 }
2032 
2033                 if (ndst->dev == dev) {
2034                         netdev_dbg(dev, "circular route to %pI6\n",
2035                                    &dst->sin6.sin6_addr);
2036                         dst_release(ndst);
2037                         dev->stats.collisions++;
2038                         goto tx_error;
2039                 }
2040 
2041                 /* Bypass encapsulation if the destination is local */
2042                 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2043                 if (rt6i_flags & RTF_LOCAL &&
2044                     !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2045                         struct vxlan_dev *dst_vxlan;
2046 
2047                         dst_release(ndst);
2048                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2049                                                    dst->sa.sa_family, dst_port,
2050                                                    vxlan->flags);
2051                         if (!dst_vxlan)
2052                                 goto tx_error;
2053                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2054                         return;
2055                 }
2056 
2057                 if (!info)
2058                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2059 
2060                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2061                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2062                 skb_scrub_packet(skb, xnet);
2063                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2064                                       vni, md, flags, udp_sum);
2065                 if (err < 0) {
2066                         dst_release(ndst);
2067                         return;
2068                 }
2069                 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2070                                      &saddr, &dst->sin6.sin6_addr, tos, ttl,
2071                                      label, src_port, dst_port, !udp_sum);
2072 #endif
2073         }
2074 
2075         return;
2076 
2077 drop:
2078         dev->stats.tx_dropped++;
2079         goto tx_free;
2080 
2081 xmit_tx_error:
2082         /* skb is already freed. */
2083         skb = NULL;
2084 rt_tx_error:
2085         ip_rt_put(rt);
2086 tx_error:
2087         dev->stats.tx_errors++;
2088 tx_free:
2089         dev_kfree_skb(skb);
2090 }
2091 
2092 /* Transmit local packets over Vxlan
2093  *
2094  * Outer IP header inherits ECN and DF from inner header.
2095  * Outer UDP destination is the VXLAN assigned port.
2096  *           source port is based on hash of flow
2097  */
2098 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2099 {
2100         struct vxlan_dev *vxlan = netdev_priv(dev);
2101         const struct ip_tunnel_info *info;
2102         struct ethhdr *eth;
2103         bool did_rsc = false;
2104         struct vxlan_rdst *rdst, *fdst = NULL;
2105         struct vxlan_fdb *f;
2106 
2107         info = skb_tunnel_info(skb);
2108 
2109         skb_reset_mac_header(skb);
2110         eth = eth_hdr(skb);
2111 
2112         if ((vxlan->flags & VXLAN_F_PROXY)) {
2113                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2114                         return arp_reduce(dev, skb);
2115 #if IS_ENABLED(CONFIG_IPV6)
2116                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2117                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2118                                        + sizeof(struct nd_msg)) &&
2119                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2120                                 struct nd_msg *msg;
2121 
2122                                 msg = (struct nd_msg *)skb_transport_header(skb);
2123                                 if (msg->icmph.icmp6_code == 0 &&
2124                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2125                                         return neigh_reduce(dev, skb);
2126                 }
2127                 eth = eth_hdr(skb);
2128 #endif
2129         }
2130 
2131         if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2132                 if (info && info->mode & IP_TUNNEL_INFO_TX)
2133                         vxlan_xmit_one(skb, dev, NULL, false);
2134                 else
2135                         kfree_skb(skb);
2136                 return NETDEV_TX_OK;
2137         }
2138 
2139         f = vxlan_find_mac(vxlan, eth->h_dest);
2140         did_rsc = false;
2141 
2142         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2143             (ntohs(eth->h_proto) == ETH_P_IP ||
2144              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2145                 did_rsc = route_shortcircuit(dev, skb);
2146                 if (did_rsc)
2147                         f = vxlan_find_mac(vxlan, eth->h_dest);
2148         }
2149 
2150         if (f == NULL) {
2151                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2152                 if (f == NULL) {
2153                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2154                             !is_multicast_ether_addr(eth->h_dest))
2155                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2156 
2157                         dev->stats.tx_dropped++;
2158                         kfree_skb(skb);
2159                         return NETDEV_TX_OK;
2160                 }
2161         }
2162 
2163         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2164                 struct sk_buff *skb1;
2165 
2166                 if (!fdst) {
2167                         fdst = rdst;
2168                         continue;
2169                 }
2170                 skb1 = skb_clone(skb, GFP_ATOMIC);
2171                 if (skb1)
2172                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2173         }
2174 
2175         if (fdst)
2176                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2177         else
2178                 kfree_skb(skb);
2179         return NETDEV_TX_OK;
2180 }
2181 
2182 /* Walk the forwarding table and purge stale entries */
2183 static void vxlan_cleanup(unsigned long arg)
2184 {
2185         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2186         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2187         unsigned int h;
2188 
2189         if (!netif_running(vxlan->dev))
2190                 return;
2191 
2192         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2193                 struct hlist_node *p, *n;
2194 
2195                 spin_lock_bh(&vxlan->hash_lock);
2196                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2197                         struct vxlan_fdb *f
2198                                 = container_of(p, struct vxlan_fdb, hlist);
2199                         unsigned long timeout;
2200 
2201                         if (f->state & NUD_PERMANENT)
2202                                 continue;
2203 
2204                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2205                         if (time_before_eq(timeout, jiffies)) {
2206                                 netdev_dbg(vxlan->dev,
2207                                            "garbage collect %pM\n",
2208                                            f->eth_addr);
2209                                 f->state = NUD_STALE;
2210                                 vxlan_fdb_destroy(vxlan, f);
2211                         } else if (time_before(timeout, next_timer))
2212                                 next_timer = timeout;
2213                 }
2214                 spin_unlock_bh(&vxlan->hash_lock);
2215         }
2216 
2217         mod_timer(&vxlan->age_timer, next_timer);
2218 }
2219 
2220 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2221 {
2222         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2223         __be32 vni = vxlan->default_dst.remote_vni;
2224 
2225         spin_lock(&vn->sock_lock);
2226         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2227         spin_unlock(&vn->sock_lock);
2228 }
2229 
2230 /* Setup stats when device is created */
2231 static int vxlan_init(struct net_device *dev)
2232 {
2233         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2234         if (!dev->tstats)
2235                 return -ENOMEM;
2236 
2237         return 0;
2238 }
2239 
2240 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2241 {
2242         struct vxlan_fdb *f;
2243 
2244         spin_lock_bh(&vxlan->hash_lock);
2245         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2246         if (f)
2247                 vxlan_fdb_destroy(vxlan, f);
2248         spin_unlock_bh(&vxlan->hash_lock);
2249 }
2250 
2251 static void vxlan_uninit(struct net_device *dev)
2252 {
2253         struct vxlan_dev *vxlan = netdev_priv(dev);
2254 
2255         vxlan_fdb_delete_default(vxlan);
2256 
2257         free_percpu(dev->tstats);
2258 }
2259 
2260 /* Start ageing timer and join group when device is brought up */
2261 static int vxlan_open(struct net_device *dev)
2262 {
2263         struct vxlan_dev *vxlan = netdev_priv(dev);
2264         int ret;
2265 
2266         ret = vxlan_sock_add(vxlan);
2267         if (ret < 0)
2268                 return ret;
2269 
2270         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2271                 ret = vxlan_igmp_join(vxlan);
2272                 if (ret == -EADDRINUSE)
2273                         ret = 0;
2274                 if (ret) {
2275                         vxlan_sock_release(vxlan);
2276                         return ret;
2277                 }
2278         }
2279 
2280         if (vxlan->cfg.age_interval)
2281                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2282 
2283         return ret;
2284 }
2285 
2286 /* Purge the forwarding table */
2287 static void vxlan_flush(struct vxlan_dev *vxlan)
2288 {
2289         unsigned int h;
2290 
2291         spin_lock_bh(&vxlan->hash_lock);
2292         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2293                 struct hlist_node *p, *n;
2294                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2295                         struct vxlan_fdb *f
2296                                 = container_of(p, struct vxlan_fdb, hlist);
2297                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2298                         if (!is_zero_ether_addr(f->eth_addr))
2299                                 vxlan_fdb_destroy(vxlan, f);
2300                 }
2301         }
2302         spin_unlock_bh(&vxlan->hash_lock);
2303 }
2304 
2305 /* Cleanup timer and forwarding table on shutdown */
2306 static int vxlan_stop(struct net_device *dev)
2307 {
2308         struct vxlan_dev *vxlan = netdev_priv(dev);
2309         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2310         int ret = 0;
2311 
2312         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2313             !vxlan_group_used(vn, vxlan))
2314                 ret = vxlan_igmp_leave(vxlan);
2315 
2316         del_timer_sync(&vxlan->age_timer);
2317 
2318         vxlan_flush(vxlan);
2319         vxlan_sock_release(vxlan);
2320 
2321         return ret;
2322 }
2323 
2324 /* Stub, nothing needs to be done. */
2325 static void vxlan_set_multicast_list(struct net_device *dev)
2326 {
2327 }
2328 
2329 static int __vxlan_change_mtu(struct net_device *dev,
2330                               struct net_device *lowerdev,
2331                               struct vxlan_rdst *dst, int new_mtu, bool strict)
2332 {
2333         int max_mtu = IP_MAX_MTU;
2334 
2335         if (lowerdev)
2336                 max_mtu = lowerdev->mtu;
2337 
2338         if (dst->remote_ip.sa.sa_family == AF_INET6)
2339                 max_mtu -= VXLAN6_HEADROOM;
2340         else
2341                 max_mtu -= VXLAN_HEADROOM;
2342 
2343         if (new_mtu < 68)
2344                 return -EINVAL;
2345 
2346         if (new_mtu > max_mtu) {
2347                 if (strict)
2348                         return -EINVAL;
2349 
2350                 new_mtu = max_mtu;
2351         }
2352 
2353         dev->mtu = new_mtu;
2354         return 0;
2355 }
2356 
2357 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2358 {
2359         struct vxlan_dev *vxlan = netdev_priv(dev);
2360         struct vxlan_rdst *dst = &vxlan->default_dst;
2361         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2362                                                          dst->remote_ifindex);
2363         return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2364 }
2365 
2366 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2367 {
2368         struct vxlan_dev *vxlan = netdev_priv(dev);
2369         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2370         __be16 sport, dport;
2371 
2372         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2373                                   vxlan->cfg.port_max, true);
2374         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2375 
2376         if (ip_tunnel_info_af(info) == AF_INET) {
2377                 struct rtable *rt;
2378 
2379                 if (!vxlan->vn4_sock)
2380                         return -EINVAL;
2381                 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2382                                      info->key.u.ipv4.dst,
2383                                      &info->key.u.ipv4.src, NULL, info);
2384                 if (IS_ERR(rt))
2385                         return PTR_ERR(rt);
2386                 ip_rt_put(rt);
2387         } else {
2388 #if IS_ENABLED(CONFIG_IPV6)
2389                 struct dst_entry *ndst;
2390 
2391                 if (!vxlan->vn6_sock)
2392                         return -EINVAL;
2393                 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
2394                                         info->key.label, &info->key.u.ipv6.dst,
2395                                         &info->key.u.ipv6.src, NULL, info);
2396                 if (IS_ERR(ndst))
2397                         return PTR_ERR(ndst);
2398                 dst_release(ndst);
2399 #else /* !CONFIG_IPV6 */
2400                 return -EPFNOSUPPORT;
2401 #endif
2402         }
2403         info->key.tp_src = sport;
2404         info->key.tp_dst = dport;
2405         return 0;
2406 }
2407 
2408 static const struct net_device_ops vxlan_netdev_ops = {
2409         .ndo_init               = vxlan_init,
2410         .ndo_uninit             = vxlan_uninit,
2411         .ndo_open               = vxlan_open,
2412         .ndo_stop               = vxlan_stop,
2413         .ndo_start_xmit         = vxlan_xmit,
2414         .ndo_get_stats64        = ip_tunnel_get_stats64,
2415         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2416         .ndo_change_mtu         = vxlan_change_mtu,
2417         .ndo_validate_addr      = eth_validate_addr,
2418         .ndo_set_mac_address    = eth_mac_addr,
2419         .ndo_fdb_add            = vxlan_fdb_add,
2420         .ndo_fdb_del            = vxlan_fdb_delete,
2421         .ndo_fdb_dump           = vxlan_fdb_dump,
2422         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2423 };
2424 
2425 /* Info for udev, that this is a virtual tunnel endpoint */
2426 static struct device_type vxlan_type = {
2427         .name = "vxlan",
2428 };
2429 
2430 /* Calls the ndo_add_vxlan_port of the caller in order to
2431  * supply the listening VXLAN udp ports. Callers are expected
2432  * to implement the ndo_add_vxlan_port.
2433  */
2434 void vxlan_get_rx_port(struct net_device *dev)
2435 {
2436         struct vxlan_sock *vs;
2437         struct net *net = dev_net(dev);
2438         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2439         sa_family_t sa_family;
2440         __be16 port;
2441         unsigned int i;
2442 
2443         spin_lock(&vn->sock_lock);
2444         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2445                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2446                         port = inet_sk(vs->sock->sk)->inet_sport;
2447                         sa_family = vxlan_get_sk_family(vs);
2448                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2449                                                             port);
2450                 }
2451         }
2452         spin_unlock(&vn->sock_lock);
2453 }
2454 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2455 
2456 /* Initialize the device structure. */
2457 static void vxlan_setup(struct net_device *dev)
2458 {
2459         struct vxlan_dev *vxlan = netdev_priv(dev);
2460         unsigned int h;
2461 
2462         eth_hw_addr_random(dev);
2463         ether_setup(dev);
2464 
2465         dev->netdev_ops = &vxlan_netdev_ops;
2466         dev->destructor = free_netdev;
2467         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2468 
2469         dev->features   |= NETIF_F_LLTX;
2470         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2471         dev->features   |= NETIF_F_RXCSUM;
2472         dev->features   |= NETIF_F_GSO_SOFTWARE;
2473 
2474         dev->vlan_features = dev->features;
2475         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2476         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2477         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2478         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2479         netif_keep_dst(dev);
2480         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2481         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2482 
2483         INIT_LIST_HEAD(&vxlan->next);
2484         spin_lock_init(&vxlan->hash_lock);
2485 
2486         init_timer_deferrable(&vxlan->age_timer);
2487         vxlan->age_timer.function = vxlan_cleanup;
2488         vxlan->age_timer.data = (unsigned long) vxlan;
2489 
2490         vxlan->cfg.dst_port = htons(vxlan_port);
2491 
2492         vxlan->dev = dev;
2493 
2494         gro_cells_init(&vxlan->gro_cells, dev);
2495 
2496         for (h = 0; h < FDB_HASH_SIZE; ++h)
2497                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2498 }
2499 
2500 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2501         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2502         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2503         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2504         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2505         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2506         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2507         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2508         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2509         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
2510         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2511         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2512         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2513         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2514         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2515         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2516         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2517         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2518         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2519         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2520         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2521         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2522         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2523         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2524         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2525         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2526         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2527 };
2528 
2529 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2530 {
2531         if (tb[IFLA_ADDRESS]) {
2532                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2533                         pr_debug("invalid link address (not ethernet)\n");
2534                         return -EINVAL;
2535                 }
2536 
2537                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2538                         pr_debug("invalid all zero ethernet address\n");
2539                         return -EADDRNOTAVAIL;
2540                 }
2541         }
2542 
2543         if (!data)
2544                 return -EINVAL;
2545 
2546         if (data[IFLA_VXLAN_ID]) {
2547                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2548                 if (id >= VXLAN_VID_MASK)
2549                         return -ERANGE;
2550         }
2551 
2552         if (data[IFLA_VXLAN_PORT_RANGE]) {
2553                 const struct ifla_vxlan_port_range *p
2554                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2555 
2556                 if (ntohs(p->high) < ntohs(p->low)) {
2557                         pr_debug("port range %u .. %u not valid\n",
2558                                  ntohs(p->low), ntohs(p->high));
2559                         return -EINVAL;
2560                 }
2561         }
2562 
2563         return 0;
2564 }
2565 
2566 static void vxlan_get_drvinfo(struct net_device *netdev,
2567                               struct ethtool_drvinfo *drvinfo)
2568 {
2569         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2570         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2571 }
2572 
2573 static const struct ethtool_ops vxlan_ethtool_ops = {
2574         .get_drvinfo    = vxlan_get_drvinfo,
2575         .get_link       = ethtool_op_get_link,
2576 };
2577 
2578 static void vxlan_del_work(struct work_struct *work)
2579 {
2580         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2581         udp_tunnel_sock_release(vs->sock);
2582         kfree_rcu(vs, rcu);
2583 }
2584 
2585 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2586                                         __be16 port, u32 flags)
2587 {
2588         struct socket *sock;
2589         struct udp_port_cfg udp_conf;
2590         int err;
2591 
2592         memset(&udp_conf, 0, sizeof(udp_conf));
2593 
2594         if (ipv6) {
2595                 udp_conf.family = AF_INET6;
2596                 udp_conf.use_udp6_rx_checksums =
2597                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2598                 udp_conf.ipv6_v6only = 1;
2599         } else {
2600                 udp_conf.family = AF_INET;
2601         }
2602 
2603         udp_conf.local_udp_port = port;
2604 
2605         /* Open UDP socket */
2606         err = udp_sock_create(net, &udp_conf, &sock);
2607         if (err < 0)
2608                 return ERR_PTR(err);
2609 
2610         return sock;
2611 }
2612 
2613 /* Create new listen socket if needed */
2614 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2615                                               __be16 port, u32 flags)
2616 {
2617         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2618         struct vxlan_sock *vs;
2619         struct socket *sock;
2620         unsigned int h;
2621         struct udp_tunnel_sock_cfg tunnel_cfg;
2622 
2623         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2624         if (!vs)
2625                 return ERR_PTR(-ENOMEM);
2626 
2627         for (h = 0; h < VNI_HASH_SIZE; ++h)
2628                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2629 
2630         INIT_WORK(&vs->del_work, vxlan_del_work);
2631 
2632         sock = vxlan_create_sock(net, ipv6, port, flags);
2633         if (IS_ERR(sock)) {
2634                 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2635                         PTR_ERR(sock));
2636                 kfree(vs);
2637                 return ERR_CAST(sock);
2638         }
2639 
2640         vs->sock = sock;
2641         atomic_set(&vs->refcnt, 1);
2642         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2643 
2644         /* Initialize the vxlan udp offloads structure */
2645         vs->udp_offloads.port = port;
2646         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2647         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2648 
2649         spin_lock(&vn->sock_lock);
2650         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2651         vxlan_notify_add_rx_port(vs);
2652         spin_unlock(&vn->sock_lock);
2653 
2654         /* Mark socket as an encapsulation socket. */
2655         tunnel_cfg.sk_user_data = vs;
2656         tunnel_cfg.encap_type = 1;
2657         tunnel_cfg.encap_rcv = vxlan_rcv;
2658         tunnel_cfg.encap_destroy = NULL;
2659 
2660         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2661 
2662         return vs;
2663 }
2664 
2665 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2666 {
2667         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2668         struct vxlan_sock *vs = NULL;
2669 
2670         if (!vxlan->cfg.no_share) {
2671                 spin_lock(&vn->sock_lock);
2672                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2673                                      vxlan->cfg.dst_port, vxlan->flags);
2674                 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2675                         spin_unlock(&vn->sock_lock);
2676                         return -EBUSY;
2677                 }
2678                 spin_unlock(&vn->sock_lock);
2679         }
2680         if (!vs)
2681                 vs = vxlan_socket_create(vxlan->net, ipv6,
2682                                          vxlan->cfg.dst_port, vxlan->flags);
2683         if (IS_ERR(vs))
2684                 return PTR_ERR(vs);
2685 #if IS_ENABLED(CONFIG_IPV6)
2686         if (ipv6)
2687                 vxlan->vn6_sock = vs;
2688         else
2689 #endif
2690                 vxlan->vn4_sock = vs;
2691         vxlan_vs_add_dev(vs, vxlan);
2692         return 0;
2693 }
2694 
2695 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2696 {
2697         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2698         bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2699         int ret = 0;
2700 
2701         vxlan->vn4_sock = NULL;
2702 #if IS_ENABLED(CONFIG_IPV6)
2703         vxlan->vn6_sock = NULL;
2704         if (ipv6 || metadata)
2705                 ret = __vxlan_sock_add(vxlan, true);
2706 #endif
2707         if (!ret && (!ipv6 || metadata))
2708                 ret = __vxlan_sock_add(vxlan, false);
2709         if (ret < 0)
2710                 vxlan_sock_release(vxlan);
2711         return ret;
2712 }
2713 
2714 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2715                                struct vxlan_config *conf)
2716 {
2717         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2718         struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2719         struct vxlan_rdst *dst = &vxlan->default_dst;
2720         unsigned short needed_headroom = ETH_HLEN;
2721         int err;
2722         bool use_ipv6 = false;
2723         __be16 default_port = vxlan->cfg.dst_port;
2724         struct net_device *lowerdev = NULL;
2725 
2726         vxlan->net = src_net;
2727 
2728         dst->remote_vni = conf->vni;
2729 
2730         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2731 
2732         /* Unless IPv6 is explicitly requested, assume IPv4 */
2733         if (!dst->remote_ip.sa.sa_family)
2734                 dst->remote_ip.sa.sa_family = AF_INET;
2735 
2736         if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2737             vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2738                 if (!IS_ENABLED(CONFIG_IPV6))
2739                         return -EPFNOSUPPORT;
2740                 use_ipv6 = true;
2741                 vxlan->flags |= VXLAN_F_IPV6;
2742         }
2743 
2744         if (conf->label && !use_ipv6) {
2745                 pr_info("label only supported in use with IPv6\n");
2746                 return -EINVAL;
2747         }
2748 
2749         if (conf->remote_ifindex) {
2750                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2751                 dst->remote_ifindex = conf->remote_ifindex;
2752 
2753                 if (!lowerdev) {
2754                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2755                         return -ENODEV;
2756                 }
2757 
2758 #if IS_ENABLED(CONFIG_IPV6)
2759                 if (use_ipv6) {
2760                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2761                         if (idev && idev->cnf.disable_ipv6) {
2762                                 pr_info("IPv6 is disabled via sysctl\n");
2763                                 return -EPERM;
2764                         }
2765                 }
2766 #endif
2767 
2768                 if (!conf->mtu)
2769                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2770 
2771                 needed_headroom = lowerdev->hard_header_len;
2772         }
2773 
2774         if (conf->mtu) {
2775                 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2776                 if (err)
2777                         return err;
2778         }
2779 
2780         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2781                 needed_headroom += VXLAN6_HEADROOM;
2782         else
2783                 needed_headroom += VXLAN_HEADROOM;
2784         dev->needed_headroom = needed_headroom;
2785 
2786         memcpy(&vxlan->cfg, conf, sizeof(*conf));
2787         if (!vxlan->cfg.dst_port)
2788                 vxlan->cfg.dst_port = default_port;
2789         vxlan->flags |= conf->flags;
2790 
2791         if (!vxlan->cfg.age_interval)
2792                 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2793 
2794         list_for_each_entry(tmp, &vn->vxlan_list, next) {
2795                 if (tmp->cfg.vni == conf->vni &&
2796                     (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2797                      tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2798                     tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2799                     (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2800                     (vxlan->flags & VXLAN_F_RCV_FLAGS))
2801                 return -EEXIST;
2802         }
2803 
2804         dev->ethtool_ops = &vxlan_ethtool_ops;
2805 
2806         /* create an fdb entry for a valid default destination */
2807         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2808                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2809                                        &vxlan->default_dst.remote_ip,
2810                                        NUD_REACHABLE|NUD_PERMANENT,
2811                                        NLM_F_EXCL|NLM_F_CREATE,
2812                                        vxlan->cfg.dst_port,
2813                                        vxlan->default_dst.remote_vni,
2814                                        vxlan->default_dst.remote_ifindex,
2815                                        NTF_SELF);
2816                 if (err)
2817                         return err;
2818         }
2819 
2820         err = register_netdevice(dev);
2821         if (err) {
2822                 vxlan_fdb_delete_default(vxlan);
2823                 return err;
2824         }
2825 
2826         list_add(&vxlan->next, &vn->vxlan_list);
2827 
2828         return 0;
2829 }
2830 
2831 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2832                                     u8 name_assign_type, struct vxlan_config *conf)
2833 {
2834         struct nlattr *tb[IFLA_MAX+1];
2835         struct net_device *dev;
2836         int err;
2837 
2838         memset(&tb, 0, sizeof(tb));
2839 
2840         dev = rtnl_create_link(net, name, name_assign_type,
2841                                &vxlan_link_ops, tb);
2842         if (IS_ERR(dev))
2843                 return dev;
2844 
2845         err = vxlan_dev_configure(net, dev, conf);
2846         if (err < 0) {
2847                 free_netdev(dev);
2848                 return ERR_PTR(err);
2849         }
2850 
2851         return dev;
2852 }
2853 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2854 
2855 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2856                          struct nlattr *tb[], struct nlattr *data[])
2857 {
2858         struct vxlan_config conf;
2859         int err;
2860 
2861         memset(&conf, 0, sizeof(conf));
2862 
2863         if (data[IFLA_VXLAN_ID])
2864                 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2865 
2866         if (data[IFLA_VXLAN_GROUP]) {
2867                 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2868         } else if (data[IFLA_VXLAN_GROUP6]) {
2869                 if (!IS_ENABLED(CONFIG_IPV6))
2870                         return -EPFNOSUPPORT;
2871 
2872                 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2873                 conf.remote_ip.sa.sa_family = AF_INET6;
2874         }
2875 
2876         if (data[IFLA_VXLAN_LOCAL]) {
2877                 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2878                 conf.saddr.sa.sa_family = AF_INET;
2879         } else if (data[IFLA_VXLAN_LOCAL6]) {
2880                 if (!IS_ENABLED(CONFIG_IPV6))
2881                         return -EPFNOSUPPORT;
2882 
2883                 /* TODO: respect scope id */
2884                 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2885                 conf.saddr.sa.sa_family = AF_INET6;
2886         }
2887 
2888         if (data[IFLA_VXLAN_LINK])
2889                 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2890 
2891         if (data[IFLA_VXLAN_TOS])
2892                 conf.tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2893 
2894         if (data[IFLA_VXLAN_TTL])
2895                 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2896 
2897         if (data[IFLA_VXLAN_LABEL])
2898                 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
2899                              IPV6_FLOWLABEL_MASK;
2900 
2901         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2902                 conf.flags |= VXLAN_F_LEARN;
2903 
2904         if (data[IFLA_VXLAN_AGEING])
2905                 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2906 
2907         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2908                 conf.flags |= VXLAN_F_PROXY;
2909 
2910         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2911                 conf.flags |= VXLAN_F_RSC;
2912 
2913         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2914                 conf.flags |= VXLAN_F_L2MISS;
2915 
2916         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2917                 conf.flags |= VXLAN_F_L3MISS;
2918 
2919         if (data[IFLA_VXLAN_LIMIT])
2920                 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2921 
2922         if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2923             nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2924                 conf.flags |= VXLAN_F_COLLECT_METADATA;
2925 
2926         if (data[IFLA_VXLAN_PORT_RANGE]) {
2927                 const struct ifla_vxlan_port_range *p
2928                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2929                 conf.port_min = ntohs(p->low);
2930                 conf.port_max = ntohs(p->high);
2931         }
2932 
2933         if (data[IFLA_VXLAN_PORT])
2934                 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2935 
2936         if (data[IFLA_VXLAN_UDP_CSUM] &&
2937             !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2938                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
2939 
2940         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2941             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2942                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2943 
2944         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2945             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2946                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2947 
2948         if (data[IFLA_VXLAN_REMCSUM_TX] &&
2949             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2950                 conf.flags |= VXLAN_F_REMCSUM_TX;
2951 
2952         if (data[IFLA_VXLAN_REMCSUM_RX] &&
2953             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2954                 conf.flags |= VXLAN_F_REMCSUM_RX;
2955 
2956         if (data[IFLA_VXLAN_GBP])
2957                 conf.flags |= VXLAN_F_GBP;
2958 
2959         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2960                 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2961 
2962         err = vxlan_dev_configure(src_net, dev, &conf);
2963         switch (err) {
2964         case -ENODEV:
2965                 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2966                 break;
2967 
2968         case -EPERM:
2969                 pr_info("IPv6 is disabled via sysctl\n");
2970                 break;
2971 
2972         case -EEXIST:
2973                 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
2974                 break;
2975         }
2976 
2977         return err;
2978 }
2979 
2980 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2981 {
2982         struct vxlan_dev *vxlan = netdev_priv(dev);
2983         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2984 
2985         spin_lock(&vn->sock_lock);
2986         if (!hlist_unhashed(&vxlan->hlist))
2987                 hlist_del_rcu(&vxlan->hlist);
2988         spin_unlock(&vn->sock_lock);
2989 
2990         gro_cells_destroy(&vxlan->gro_cells);
2991         list_del(&vxlan->next);
2992         unregister_netdevice_queue(dev, head);
2993 }
2994 
2995 static size_t vxlan_get_size(const struct net_device *dev)
2996 {
2997 
2998         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
2999                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3000                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3001                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3002                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3003                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3004                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3005                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3006                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3007                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3008                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3009                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3010                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3011                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3012                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3013                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3014                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3015                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3016                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3017                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3018                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3019                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3020                 0;
3021 }
3022 
3023 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3024 {
3025         const struct vxlan_dev *vxlan = netdev_priv(dev);
3026         const struct vxlan_rdst *dst = &vxlan->default_dst;
3027         struct ifla_vxlan_port_range ports = {
3028                 .low =  htons(vxlan->cfg.port_min),
3029                 .high = htons(vxlan->cfg.port_max),
3030         };
3031 
3032         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3033                 goto nla_put_failure;
3034 
3035         if (!vxlan_addr_any(&dst->remote_ip)) {
3036                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3037                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3038                                             dst->remote_ip.sin.sin_addr.s_addr))
3039                                 goto nla_put_failure;
3040 #if IS_ENABLED(CONFIG_IPV6)
3041                 } else {
3042                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3043                                              &dst->remote_ip.sin6.sin6_addr))
3044                                 goto nla_put_failure;
3045 #endif
3046                 }
3047         }
3048 
3049         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3050                 goto nla_put_failure;
3051 
3052         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3053                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3054                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3055                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3056                                 goto nla_put_failure;
3057 #if IS_ENABLED(CONFIG_IPV6)
3058                 } else {
3059                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3060                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3061                                 goto nla_put_failure;
3062 #endif
3063                 }
3064         }
3065 
3066         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3067             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3068             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3069             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3070                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
3071             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3072                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
3073             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3074             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3075                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3076             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3077                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3078             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3079                        !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3080             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3081             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3082             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3083             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3084                         !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3085             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3086                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3087             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3088                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3089             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3090                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3091             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3092                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3093                 goto nla_put_failure;
3094 
3095         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3096                 goto nla_put_failure;
3097 
3098         if (vxlan->flags & VXLAN_F_GBP &&
3099             nla_put_flag(skb, IFLA_VXLAN_GBP))
3100                 goto nla_put_failure;
3101 
3102         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3103             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3104                 goto nla_put_failure;
3105 
3106         return 0;
3107 
3108 nla_put_failure:
3109         return -EMSGSIZE;
3110 }
3111 
3112 static struct net *vxlan_get_link_net(const struct net_device *dev)
3113 {
3114         struct vxlan_dev *vxlan = netdev_priv(dev);
3115 
3116         return vxlan->net;
3117 }
3118 
3119 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3120         .kind           = "vxlan",
3121         .maxtype        = IFLA_VXLAN_MAX,
3122         .policy         = vxlan_policy,
3123         .priv_size      = sizeof(struct vxlan_dev),
3124         .setup          = vxlan_setup,
3125         .validate       = vxlan_validate,
3126         .newlink        = vxlan_newlink,
3127         .dellink        = vxlan_dellink,
3128         .get_size       = vxlan_get_size,
3129         .fill_info      = vxlan_fill_info,
3130         .get_link_net   = vxlan_get_link_net,
3131 };
3132 
3133 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3134                                              struct net_device *dev)
3135 {
3136         struct vxlan_dev *vxlan, *next;
3137         LIST_HEAD(list_kill);
3138 
3139         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3140                 struct vxlan_rdst *dst = &vxlan->default_dst;
3141 
3142                 /* In case we created vxlan device with carrier
3143                  * and we loose the carrier due to module unload
3144                  * we also need to remove vxlan device. In other
3145                  * cases, it's not necessary and remote_ifindex
3146                  * is 0 here, so no matches.
3147                  */
3148                 if (dst->remote_ifindex == dev->ifindex)
3149                         vxlan_dellink(vxlan->dev, &list_kill);
3150         }
3151 
3152         unregister_netdevice_many(&list_kill);
3153 }
3154 
3155 static int vxlan_lowerdev_event(struct notifier_block *unused,
3156                                 unsigned long event, void *ptr)
3157 {
3158         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3159         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3160 
3161         if (event == NETDEV_UNREGISTER)
3162                 vxlan_handle_lowerdev_unregister(vn, dev);
3163 
3164         return NOTIFY_DONE;
3165 }
3166 
3167 static struct notifier_block vxlan_notifier_block __read_mostly = {
3168         .notifier_call = vxlan_lowerdev_event,
3169 };
3170 
3171 static __net_init int vxlan_init_net(struct net *net)
3172 {
3173         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3174         unsigned int h;
3175 
3176         INIT_LIST_HEAD(&vn->vxlan_list);
3177         spin_lock_init(&vn->sock_lock);
3178 
3179         for (h = 0; h < PORT_HASH_SIZE; ++h)
3180                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3181 
3182         return 0;
3183 }
3184 
3185 static void __net_exit vxlan_exit_net(struct net *net)
3186 {
3187         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3188         struct vxlan_dev *vxlan, *next;
3189         struct net_device *dev, *aux;
3190         LIST_HEAD(list);
3191 
3192         rtnl_lock();
3193         for_each_netdev_safe(net, dev, aux)
3194                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3195                         unregister_netdevice_queue(dev, &list);
3196 
3197         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3198                 /* If vxlan->dev is in the same netns, it has already been added
3199                  * to the list by the previous loop.
3200                  */
3201                 if (!net_eq(dev_net(vxlan->dev), net)) {
3202                         gro_cells_destroy(&vxlan->gro_cells);
3203                         unregister_netdevice_queue(vxlan->dev, &list);
3204                 }
3205         }
3206 
3207         unregister_netdevice_many(&list);
3208         rtnl_unlock();
3209 }
3210 
3211 static struct pernet_operations vxlan_net_ops = {
3212         .init = vxlan_init_net,
3213         .exit = vxlan_exit_net,
3214         .id   = &vxlan_net_id,
3215         .size = sizeof(struct vxlan_net),
3216 };
3217 
3218 static int __init vxlan_init_module(void)
3219 {
3220         int rc;
3221 
3222         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3223         if (!vxlan_wq)
3224                 return -ENOMEM;
3225 
3226         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3227 
3228         rc = register_pernet_subsys(&vxlan_net_ops);
3229         if (rc)
3230                 goto out1;
3231 
3232         rc = register_netdevice_notifier(&vxlan_notifier_block);
3233         if (rc)
3234                 goto out2;
3235 
3236         rc = rtnl_link_register(&vxlan_link_ops);
3237         if (rc)
3238                 goto out3;
3239 
3240         return 0;
3241 out3:
3242         unregister_netdevice_notifier(&vxlan_notifier_block);
3243 out2:
3244         unregister_pernet_subsys(&vxlan_net_ops);
3245 out1:
3246         destroy_workqueue(vxlan_wq);
3247         return rc;
3248 }
3249 late_initcall(vxlan_init_module);
3250 
3251 static void __exit vxlan_cleanup_module(void)
3252 {
3253         rtnl_link_unregister(&vxlan_link_ops);
3254         unregister_netdevice_notifier(&vxlan_notifier_block);
3255         destroy_workqueue(vxlan_wq);
3256         unregister_pernet_subsys(&vxlan_net_ops);
3257         /* rcu_barrier() is called by netns */
3258 }
3259 module_exit(vxlan_cleanup_module);
3260 
3261 MODULE_LICENSE("GPL");
3262 MODULE_VERSION(VXLAN_VERSION);
3263 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3264 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3265 MODULE_ALIAS_RTNL_LINK("vxlan");
3266 

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