Version:  2.0.40 2.2.26 2.4.37 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 4.7

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 
102 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
103 {
104         return vs->flags & VXLAN_F_COLLECT_METADATA ||
105                ip_tunnel_collect_metadata();
106 }
107 
108 #if IS_ENABLED(CONFIG_IPV6)
109 static inline
110 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
111 {
112         if (a->sa.sa_family != b->sa.sa_family)
113                 return false;
114         if (a->sa.sa_family == AF_INET6)
115                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
116         else
117                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
118 }
119 
120 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
121 {
122         if (ipa->sa.sa_family == AF_INET6)
123                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
124         else
125                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
126 }
127 
128 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
129 {
130         if (ipa->sa.sa_family == AF_INET6)
131                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
132         else
133                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
134 }
135 
136 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
137 {
138         if (nla_len(nla) >= sizeof(struct in6_addr)) {
139                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
140                 ip->sa.sa_family = AF_INET6;
141                 return 0;
142         } else if (nla_len(nla) >= sizeof(__be32)) {
143                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
144                 ip->sa.sa_family = AF_INET;
145                 return 0;
146         } else {
147                 return -EAFNOSUPPORT;
148         }
149 }
150 
151 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
152                               const union vxlan_addr *ip)
153 {
154         if (ip->sa.sa_family == AF_INET6)
155                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
156         else
157                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
158 }
159 
160 #else /* !CONFIG_IPV6 */
161 
162 static inline
163 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
164 {
165         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
166 }
167 
168 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
169 {
170         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
171 }
172 
173 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
174 {
175         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
176 }
177 
178 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
179 {
180         if (nla_len(nla) >= sizeof(struct in6_addr)) {
181                 return -EAFNOSUPPORT;
182         } else if (nla_len(nla) >= sizeof(__be32)) {
183                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
184                 ip->sa.sa_family = AF_INET;
185                 return 0;
186         } else {
187                 return -EAFNOSUPPORT;
188         }
189 }
190 
191 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
192                               const union vxlan_addr *ip)
193 {
194         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
195 }
196 #endif
197 
198 /* Virtual Network hash table head */
199 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
200 {
201         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
202 }
203 
204 /* Socket hash table head */
205 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
206 {
207         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
208 
209         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
210 }
211 
212 /* First remote destination for a forwarding entry.
213  * Guaranteed to be non-NULL because remotes are never deleted.
214  */
215 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
216 {
217         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
218 }
219 
220 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
221 {
222         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
223 }
224 
225 /* Find VXLAN socket based on network namespace, address family and UDP port
226  * and enabled unshareable flags.
227  */
228 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
229                                           __be16 port, u32 flags)
230 {
231         struct vxlan_sock *vs;
232 
233         flags &= VXLAN_F_RCV_FLAGS;
234 
235         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
236                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
237                     vxlan_get_sk_family(vs) == family &&
238                     vs->flags == flags)
239                         return vs;
240         }
241         return NULL;
242 }
243 
244 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
245 {
246         struct vxlan_dev *vxlan;
247 
248         /* For flow based devices, map all packets to VNI 0 */
249         if (vs->flags & VXLAN_F_COLLECT_METADATA)
250                 vni = 0;
251 
252         hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
253                 if (vxlan->default_dst.remote_vni == vni)
254                         return vxlan;
255         }
256 
257         return NULL;
258 }
259 
260 /* Look up VNI in a per net namespace table */
261 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
262                                         sa_family_t family, __be16 port,
263                                         u32 flags)
264 {
265         struct vxlan_sock *vs;
266 
267         vs = vxlan_find_sock(net, family, port, flags);
268         if (!vs)
269                 return NULL;
270 
271         return vxlan_vs_find_vni(vs, vni);
272 }
273 
274 /* Fill in neighbour message in skbuff. */
275 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
276                           const struct vxlan_fdb *fdb,
277                           u32 portid, u32 seq, int type, unsigned int flags,
278                           const struct vxlan_rdst *rdst)
279 {
280         unsigned long now = jiffies;
281         struct nda_cacheinfo ci;
282         struct nlmsghdr *nlh;
283         struct ndmsg *ndm;
284         bool send_ip, send_eth;
285 
286         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
287         if (nlh == NULL)
288                 return -EMSGSIZE;
289 
290         ndm = nlmsg_data(nlh);
291         memset(ndm, 0, sizeof(*ndm));
292 
293         send_eth = send_ip = true;
294 
295         if (type == RTM_GETNEIGH) {
296                 ndm->ndm_family = AF_INET;
297                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
298                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
299         } else
300                 ndm->ndm_family = AF_BRIDGE;
301         ndm->ndm_state = fdb->state;
302         ndm->ndm_ifindex = vxlan->dev->ifindex;
303         ndm->ndm_flags = fdb->flags;
304         ndm->ndm_type = RTN_UNICAST;
305 
306         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
307             nla_put_s32(skb, NDA_LINK_NETNSID,
308                         peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
309                 goto nla_put_failure;
310 
311         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
312                 goto nla_put_failure;
313 
314         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
315                 goto nla_put_failure;
316 
317         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
318             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
319                 goto nla_put_failure;
320         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
321             nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
322                 goto nla_put_failure;
323         if (rdst->remote_ifindex &&
324             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
325                 goto nla_put_failure;
326 
327         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
328         ci.ndm_confirmed = 0;
329         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
330         ci.ndm_refcnt    = 0;
331 
332         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
333                 goto nla_put_failure;
334 
335         nlmsg_end(skb, nlh);
336         return 0;
337 
338 nla_put_failure:
339         nlmsg_cancel(skb, nlh);
340         return -EMSGSIZE;
341 }
342 
343 static inline size_t vxlan_nlmsg_size(void)
344 {
345         return NLMSG_ALIGN(sizeof(struct ndmsg))
346                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
347                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
348                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
349                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
350                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
351                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
352                 + nla_total_size(sizeof(struct nda_cacheinfo));
353 }
354 
355 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
356                              struct vxlan_rdst *rd, int type)
357 {
358         struct net *net = dev_net(vxlan->dev);
359         struct sk_buff *skb;
360         int err = -ENOBUFS;
361 
362         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
363         if (skb == NULL)
364                 goto errout;
365 
366         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
367         if (err < 0) {
368                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
369                 WARN_ON(err == -EMSGSIZE);
370                 kfree_skb(skb);
371                 goto errout;
372         }
373 
374         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
375         return;
376 errout:
377         if (err < 0)
378                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
379 }
380 
381 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
382 {
383         struct vxlan_dev *vxlan = netdev_priv(dev);
384         struct vxlan_fdb f = {
385                 .state = NUD_STALE,
386         };
387         struct vxlan_rdst remote = {
388                 .remote_ip = *ipa, /* goes to NDA_DST */
389                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
390         };
391 
392         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
393 }
394 
395 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
396 {
397         struct vxlan_fdb f = {
398                 .state = NUD_STALE,
399         };
400         struct vxlan_rdst remote = { };
401 
402         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
403 
404         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
405 }
406 
407 /* Hash Ethernet address */
408 static u32 eth_hash(const unsigned char *addr)
409 {
410         u64 value = get_unaligned((u64 *)addr);
411 
412         /* only want 6 bytes */
413 #ifdef __BIG_ENDIAN
414         value >>= 16;
415 #else
416         value <<= 16;
417 #endif
418         return hash_64(value, FDB_HASH_BITS);
419 }
420 
421 /* Hash chain to use given mac address */
422 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
423                                                 const u8 *mac)
424 {
425         return &vxlan->fdb_head[eth_hash(mac)];
426 }
427 
428 /* Look up Ethernet address in forwarding table */
429 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
430                                         const u8 *mac)
431 {
432         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
433         struct vxlan_fdb *f;
434 
435         hlist_for_each_entry_rcu(f, head, hlist) {
436                 if (ether_addr_equal(mac, f->eth_addr))
437                         return f;
438         }
439 
440         return NULL;
441 }
442 
443 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
444                                         const u8 *mac)
445 {
446         struct vxlan_fdb *f;
447 
448         f = __vxlan_find_mac(vxlan, mac);
449         if (f)
450                 f->used = jiffies;
451 
452         return f;
453 }
454 
455 /* caller should hold vxlan->hash_lock */
456 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
457                                               union vxlan_addr *ip, __be16 port,
458                                               __be32 vni, __u32 ifindex)
459 {
460         struct vxlan_rdst *rd;
461 
462         list_for_each_entry(rd, &f->remotes, list) {
463                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
464                     rd->remote_port == port &&
465                     rd->remote_vni == vni &&
466                     rd->remote_ifindex == ifindex)
467                         return rd;
468         }
469 
470         return NULL;
471 }
472 
473 /* Replace destination of unicast mac */
474 static int vxlan_fdb_replace(struct vxlan_fdb *f,
475                              union vxlan_addr *ip, __be16 port, __be32 vni,
476                              __u32 ifindex)
477 {
478         struct vxlan_rdst *rd;
479 
480         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
481         if (rd)
482                 return 0;
483 
484         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
485         if (!rd)
486                 return 0;
487 
488         dst_cache_reset(&rd->dst_cache);
489         rd->remote_ip = *ip;
490         rd->remote_port = port;
491         rd->remote_vni = vni;
492         rd->remote_ifindex = ifindex;
493         return 1;
494 }
495 
496 /* Add/update destinations for multicast */
497 static int vxlan_fdb_append(struct vxlan_fdb *f,
498                             union vxlan_addr *ip, __be16 port, __be32 vni,
499                             __u32 ifindex, struct vxlan_rdst **rdp)
500 {
501         struct vxlan_rdst *rd;
502 
503         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
504         if (rd)
505                 return 0;
506 
507         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
508         if (rd == NULL)
509                 return -ENOBUFS;
510 
511         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
512                 kfree(rd);
513                 return -ENOBUFS;
514         }
515 
516         rd->remote_ip = *ip;
517         rd->remote_port = port;
518         rd->remote_vni = vni;
519         rd->remote_ifindex = ifindex;
520 
521         list_add_tail_rcu(&rd->list, &f->remotes);
522 
523         *rdp = rd;
524         return 1;
525 }
526 
527 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
528                                           unsigned int off,
529                                           struct vxlanhdr *vh, size_t hdrlen,
530                                           __be32 vni_field,
531                                           struct gro_remcsum *grc,
532                                           bool nopartial)
533 {
534         size_t start, offset;
535 
536         if (skb->remcsum_offload)
537                 return vh;
538 
539         if (!NAPI_GRO_CB(skb)->csum_valid)
540                 return NULL;
541 
542         start = vxlan_rco_start(vni_field);
543         offset = start + vxlan_rco_offset(vni_field);
544 
545         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
546                                      start, offset, grc, nopartial);
547 
548         skb->remcsum_offload = 1;
549 
550         return vh;
551 }
552 
553 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
554                                           struct sk_buff **head,
555                                           struct sk_buff *skb)
556 {
557         struct sk_buff *p, **pp = NULL;
558         struct vxlanhdr *vh, *vh2;
559         unsigned int hlen, off_vx;
560         int flush = 1;
561         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
562         __be32 flags;
563         struct gro_remcsum grc;
564 
565         skb_gro_remcsum_init(&grc);
566 
567         off_vx = skb_gro_offset(skb);
568         hlen = off_vx + sizeof(*vh);
569         vh   = skb_gro_header_fast(skb, off_vx);
570         if (skb_gro_header_hard(skb, hlen)) {
571                 vh = skb_gro_header_slow(skb, hlen, off_vx);
572                 if (unlikely(!vh))
573                         goto out;
574         }
575 
576         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
577 
578         flags = vh->vx_flags;
579 
580         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
581                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
582                                        vh->vx_vni, &grc,
583                                        !!(vs->flags &
584                                           VXLAN_F_REMCSUM_NOPARTIAL));
585 
586                 if (!vh)
587                         goto out;
588         }
589 
590         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
591 
592         for (p = *head; p; p = p->next) {
593                 if (!NAPI_GRO_CB(p)->same_flow)
594                         continue;
595 
596                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
597                 if (vh->vx_flags != vh2->vx_flags ||
598                     vh->vx_vni != vh2->vx_vni) {
599                         NAPI_GRO_CB(p)->same_flow = 0;
600                         continue;
601                 }
602         }
603 
604         pp = eth_gro_receive(head, skb);
605         flush = 0;
606 
607 out:
608         skb_gro_remcsum_cleanup(skb, &grc);
609         NAPI_GRO_CB(skb)->flush |= flush;
610 
611         return pp;
612 }
613 
614 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
615 {
616         /* Sets 'skb->inner_mac_header' since we are always called with
617          * 'skb->encapsulation' set.
618          */
619         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
620 }
621 
622 /* Notify netdevs that UDP port started listening */
623 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
624 {
625         struct net_device *dev;
626         struct sock *sk = vs->sock->sk;
627         struct net *net = sock_net(sk);
628         sa_family_t sa_family = vxlan_get_sk_family(vs);
629         __be16 port = inet_sk(sk)->inet_sport;
630 
631         rcu_read_lock();
632         for_each_netdev_rcu(net, dev) {
633                 if (dev->netdev_ops->ndo_add_vxlan_port)
634                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
635                                                             port);
636         }
637         rcu_read_unlock();
638 }
639 
640 /* Notify netdevs that UDP port is no more listening */
641 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
642 {
643         struct net_device *dev;
644         struct sock *sk = vs->sock->sk;
645         struct net *net = sock_net(sk);
646         sa_family_t sa_family = vxlan_get_sk_family(vs);
647         __be16 port = inet_sk(sk)->inet_sport;
648 
649         rcu_read_lock();
650         for_each_netdev_rcu(net, dev) {
651                 if (dev->netdev_ops->ndo_del_vxlan_port)
652                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
653                                                             port);
654         }
655         rcu_read_unlock();
656 }
657 
658 /* Add new entry to forwarding table -- assumes lock held */
659 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
660                             const u8 *mac, union vxlan_addr *ip,
661                             __u16 state, __u16 flags,
662                             __be16 port, __be32 vni, __u32 ifindex,
663                             __u8 ndm_flags)
664 {
665         struct vxlan_rdst *rd = NULL;
666         struct vxlan_fdb *f;
667         int notify = 0;
668 
669         f = __vxlan_find_mac(vxlan, mac);
670         if (f) {
671                 if (flags & NLM_F_EXCL) {
672                         netdev_dbg(vxlan->dev,
673                                    "lost race to create %pM\n", mac);
674                         return -EEXIST;
675                 }
676                 if (f->state != state) {
677                         f->state = state;
678                         f->updated = jiffies;
679                         notify = 1;
680                 }
681                 if (f->flags != ndm_flags) {
682                         f->flags = ndm_flags;
683                         f->updated = jiffies;
684                         notify = 1;
685                 }
686                 if ((flags & NLM_F_REPLACE)) {
687                         /* Only change unicasts */
688                         if (!(is_multicast_ether_addr(f->eth_addr) ||
689                              is_zero_ether_addr(f->eth_addr))) {
690                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
691                                                            ifindex);
692                         } else
693                                 return -EOPNOTSUPP;
694                 }
695                 if ((flags & NLM_F_APPEND) &&
696                     (is_multicast_ether_addr(f->eth_addr) ||
697                      is_zero_ether_addr(f->eth_addr))) {
698                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
699                                                   &rd);
700 
701                         if (rc < 0)
702                                 return rc;
703                         notify |= rc;
704                 }
705         } else {
706                 if (!(flags & NLM_F_CREATE))
707                         return -ENOENT;
708 
709                 if (vxlan->cfg.addrmax &&
710                     vxlan->addrcnt >= vxlan->cfg.addrmax)
711                         return -ENOSPC;
712 
713                 /* Disallow replace to add a multicast entry */
714                 if ((flags & NLM_F_REPLACE) &&
715                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
716                         return -EOPNOTSUPP;
717 
718                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
719                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
720                 if (!f)
721                         return -ENOMEM;
722 
723                 notify = 1;
724                 f->state = state;
725                 f->flags = ndm_flags;
726                 f->updated = f->used = jiffies;
727                 INIT_LIST_HEAD(&f->remotes);
728                 memcpy(f->eth_addr, mac, ETH_ALEN);
729 
730                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
731 
732                 ++vxlan->addrcnt;
733                 hlist_add_head_rcu(&f->hlist,
734                                    vxlan_fdb_head(vxlan, mac));
735         }
736 
737         if (notify) {
738                 if (rd == NULL)
739                         rd = first_remote_rtnl(f);
740                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
741         }
742 
743         return 0;
744 }
745 
746 static void vxlan_fdb_free(struct rcu_head *head)
747 {
748         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
749         struct vxlan_rdst *rd, *nd;
750 
751         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
752                 dst_cache_destroy(&rd->dst_cache);
753                 kfree(rd);
754         }
755         kfree(f);
756 }
757 
758 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
759 {
760         netdev_dbg(vxlan->dev,
761                     "delete %pM\n", f->eth_addr);
762 
763         --vxlan->addrcnt;
764         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
765 
766         hlist_del_rcu(&f->hlist);
767         call_rcu(&f->rcu, vxlan_fdb_free);
768 }
769 
770 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
771                            union vxlan_addr *ip, __be16 *port, __be32 *vni,
772                            u32 *ifindex)
773 {
774         struct net *net = dev_net(vxlan->dev);
775         int err;
776 
777         if (tb[NDA_DST]) {
778                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
779                 if (err)
780                         return err;
781         } else {
782                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
783                 if (remote->sa.sa_family == AF_INET) {
784                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
785                         ip->sa.sa_family = AF_INET;
786 #if IS_ENABLED(CONFIG_IPV6)
787                 } else {
788                         ip->sin6.sin6_addr = in6addr_any;
789                         ip->sa.sa_family = AF_INET6;
790 #endif
791                 }
792         }
793 
794         if (tb[NDA_PORT]) {
795                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
796                         return -EINVAL;
797                 *port = nla_get_be16(tb[NDA_PORT]);
798         } else {
799                 *port = vxlan->cfg.dst_port;
800         }
801 
802         if (tb[NDA_VNI]) {
803                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
804                         return -EINVAL;
805                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
806         } else {
807                 *vni = vxlan->default_dst.remote_vni;
808         }
809 
810         if (tb[NDA_IFINDEX]) {
811                 struct net_device *tdev;
812 
813                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
814                         return -EINVAL;
815                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
816                 tdev = __dev_get_by_index(net, *ifindex);
817                 if (!tdev)
818                         return -EADDRNOTAVAIL;
819         } else {
820                 *ifindex = 0;
821         }
822 
823         return 0;
824 }
825 
826 /* Add static entry (via netlink) */
827 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
828                          struct net_device *dev,
829                          const unsigned char *addr, u16 vid, u16 flags)
830 {
831         struct vxlan_dev *vxlan = netdev_priv(dev);
832         /* struct net *net = dev_net(vxlan->dev); */
833         union vxlan_addr ip;
834         __be16 port;
835         __be32 vni;
836         u32 ifindex;
837         int err;
838 
839         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
840                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
841                         ndm->ndm_state);
842                 return -EINVAL;
843         }
844 
845         if (tb[NDA_DST] == NULL)
846                 return -EINVAL;
847 
848         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
849         if (err)
850                 return err;
851 
852         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
853                 return -EAFNOSUPPORT;
854 
855         spin_lock_bh(&vxlan->hash_lock);
856         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
857                                port, vni, ifindex, ndm->ndm_flags);
858         spin_unlock_bh(&vxlan->hash_lock);
859 
860         return err;
861 }
862 
863 /* Delete entry (via netlink) */
864 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
865                             struct net_device *dev,
866                             const unsigned char *addr, u16 vid)
867 {
868         struct vxlan_dev *vxlan = netdev_priv(dev);
869         struct vxlan_fdb *f;
870         struct vxlan_rdst *rd = NULL;
871         union vxlan_addr ip;
872         __be16 port;
873         __be32 vni;
874         u32 ifindex;
875         int err;
876 
877         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
878         if (err)
879                 return err;
880 
881         err = -ENOENT;
882 
883         spin_lock_bh(&vxlan->hash_lock);
884         f = vxlan_find_mac(vxlan, addr);
885         if (!f)
886                 goto out;
887 
888         if (!vxlan_addr_any(&ip)) {
889                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
890                 if (!rd)
891                         goto out;
892         }
893 
894         err = 0;
895 
896         /* remove a destination if it's not the only one on the list,
897          * otherwise destroy the fdb entry
898          */
899         if (rd && !list_is_singular(&f->remotes)) {
900                 list_del_rcu(&rd->list);
901                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
902                 kfree_rcu(rd, rcu);
903                 goto out;
904         }
905 
906         vxlan_fdb_destroy(vxlan, f);
907 
908 out:
909         spin_unlock_bh(&vxlan->hash_lock);
910 
911         return err;
912 }
913 
914 /* Dump forwarding table */
915 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
916                           struct net_device *dev,
917                           struct net_device *filter_dev, int idx)
918 {
919         struct vxlan_dev *vxlan = netdev_priv(dev);
920         unsigned int h;
921 
922         for (h = 0; h < FDB_HASH_SIZE; ++h) {
923                 struct vxlan_fdb *f;
924                 int err;
925 
926                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
927                         struct vxlan_rdst *rd;
928 
929                         list_for_each_entry_rcu(rd, &f->remotes, list) {
930                                 if (idx < cb->args[0])
931                                         goto skip;
932 
933                                 err = vxlan_fdb_info(skb, vxlan, f,
934                                                      NETLINK_CB(cb->skb).portid,
935                                                      cb->nlh->nlmsg_seq,
936                                                      RTM_NEWNEIGH,
937                                                      NLM_F_MULTI, rd);
938                                 if (err < 0) {
939                                         cb->args[1] = err;
940                                         goto out;
941                                 }
942 skip:
943                                 ++idx;
944                         }
945                 }
946         }
947 out:
948         return idx;
949 }
950 
951 /* Watch incoming packets to learn mapping between Ethernet address
952  * and Tunnel endpoint.
953  * Return true if packet is bogus and should be dropped.
954  */
955 static bool vxlan_snoop(struct net_device *dev,
956                         union vxlan_addr *src_ip, const u8 *src_mac)
957 {
958         struct vxlan_dev *vxlan = netdev_priv(dev);
959         struct vxlan_fdb *f;
960 
961         f = vxlan_find_mac(vxlan, src_mac);
962         if (likely(f)) {
963                 struct vxlan_rdst *rdst = first_remote_rcu(f);
964 
965                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
966                         return false;
967 
968                 /* Don't migrate static entries, drop packets */
969                 if (f->state & NUD_NOARP)
970                         return true;
971 
972                 if (net_ratelimit())
973                         netdev_info(dev,
974                                     "%pM migrated from %pIS to %pIS\n",
975                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
976 
977                 rdst->remote_ip = *src_ip;
978                 f->updated = jiffies;
979                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
980         } else {
981                 /* learned new entry */
982                 spin_lock(&vxlan->hash_lock);
983 
984                 /* close off race between vxlan_flush and incoming packets */
985                 if (netif_running(dev))
986                         vxlan_fdb_create(vxlan, src_mac, src_ip,
987                                          NUD_REACHABLE,
988                                          NLM_F_EXCL|NLM_F_CREATE,
989                                          vxlan->cfg.dst_port,
990                                          vxlan->default_dst.remote_vni,
991                                          0, NTF_SELF);
992                 spin_unlock(&vxlan->hash_lock);
993         }
994 
995         return false;
996 }
997 
998 /* See if multicast group is already in use by other ID */
999 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1000 {
1001         struct vxlan_dev *vxlan;
1002         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1003 
1004         /* The vxlan_sock is only used by dev, leaving group has
1005          * no effect on other vxlan devices.
1006          */
1007         if (family == AF_INET && dev->vn4_sock &&
1008             atomic_read(&dev->vn4_sock->refcnt) == 1)
1009                 return false;
1010 #if IS_ENABLED(CONFIG_IPV6)
1011         if (family == AF_INET6 && dev->vn6_sock &&
1012             atomic_read(&dev->vn6_sock->refcnt) == 1)
1013                 return false;
1014 #endif
1015 
1016         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1017                 if (!netif_running(vxlan->dev) || vxlan == dev)
1018                         continue;
1019 
1020                 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1021                         continue;
1022 #if IS_ENABLED(CONFIG_IPV6)
1023                 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1024                         continue;
1025 #endif
1026 
1027                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1028                                       &dev->default_dst.remote_ip))
1029                         continue;
1030 
1031                 if (vxlan->default_dst.remote_ifindex !=
1032                     dev->default_dst.remote_ifindex)
1033                         continue;
1034 
1035                 return true;
1036         }
1037 
1038         return false;
1039 }
1040 
1041 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1042 {
1043         struct vxlan_net *vn;
1044 
1045         if (!vs)
1046                 return false;
1047         if (!atomic_dec_and_test(&vs->refcnt))
1048                 return false;
1049 
1050         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1051         spin_lock(&vn->sock_lock);
1052         hlist_del_rcu(&vs->hlist);
1053         vxlan_notify_del_rx_port(vs);
1054         spin_unlock(&vn->sock_lock);
1055 
1056         return true;
1057 }
1058 
1059 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1060 {
1061         bool ipv4 = __vxlan_sock_release_prep(vxlan->vn4_sock);
1062 #if IS_ENABLED(CONFIG_IPV6)
1063         bool ipv6 = __vxlan_sock_release_prep(vxlan->vn6_sock);
1064 #endif
1065 
1066         synchronize_net();
1067 
1068         if (ipv4) {
1069                 udp_tunnel_sock_release(vxlan->vn4_sock->sock);
1070                 kfree(vxlan->vn4_sock);
1071         }
1072 
1073 #if IS_ENABLED(CONFIG_IPV6)
1074         if (ipv6) {
1075                 udp_tunnel_sock_release(vxlan->vn6_sock->sock);
1076                 kfree(vxlan->vn6_sock);
1077         }
1078 #endif
1079 }
1080 
1081 /* Update multicast group membership when first VNI on
1082  * multicast address is brought up
1083  */
1084 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1085 {
1086         struct sock *sk;
1087         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1088         int ifindex = vxlan->default_dst.remote_ifindex;
1089         int ret = -EINVAL;
1090 
1091         if (ip->sa.sa_family == AF_INET) {
1092                 struct ip_mreqn mreq = {
1093                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1094                         .imr_ifindex            = ifindex,
1095                 };
1096 
1097                 sk = vxlan->vn4_sock->sock->sk;
1098                 lock_sock(sk);
1099                 ret = ip_mc_join_group(sk, &mreq);
1100                 release_sock(sk);
1101 #if IS_ENABLED(CONFIG_IPV6)
1102         } else {
1103                 sk = vxlan->vn6_sock->sock->sk;
1104                 lock_sock(sk);
1105                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1106                                                    &ip->sin6.sin6_addr);
1107                 release_sock(sk);
1108 #endif
1109         }
1110 
1111         return ret;
1112 }
1113 
1114 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1115 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1116 {
1117         struct sock *sk;
1118         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1119         int ifindex = vxlan->default_dst.remote_ifindex;
1120         int ret = -EINVAL;
1121 
1122         if (ip->sa.sa_family == AF_INET) {
1123                 struct ip_mreqn mreq = {
1124                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1125                         .imr_ifindex            = ifindex,
1126                 };
1127 
1128                 sk = vxlan->vn4_sock->sock->sk;
1129                 lock_sock(sk);
1130                 ret = ip_mc_leave_group(sk, &mreq);
1131                 release_sock(sk);
1132 #if IS_ENABLED(CONFIG_IPV6)
1133         } else {
1134                 sk = vxlan->vn6_sock->sock->sk;
1135                 lock_sock(sk);
1136                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1137                                                    &ip->sin6.sin6_addr);
1138                 release_sock(sk);
1139 #endif
1140         }
1141 
1142         return ret;
1143 }
1144 
1145 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1146                           struct sk_buff *skb, u32 vxflags)
1147 {
1148         size_t start, offset;
1149 
1150         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1151                 goto out;
1152 
1153         start = vxlan_rco_start(unparsed->vx_vni);
1154         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1155 
1156         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1157                 return false;
1158 
1159         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1160                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1161 out:
1162         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1163         unparsed->vx_vni &= VXLAN_VNI_MASK;
1164         return true;
1165 }
1166 
1167 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1168                                 struct sk_buff *skb, u32 vxflags,
1169                                 struct vxlan_metadata *md)
1170 {
1171         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1172         struct metadata_dst *tun_dst;
1173 
1174         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1175                 goto out;
1176 
1177         md->gbp = ntohs(gbp->policy_id);
1178 
1179         tun_dst = (struct metadata_dst *)skb_dst(skb);
1180         if (tun_dst) {
1181                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1182                 tun_dst->u.tun_info.options_len = sizeof(*md);
1183         }
1184         if (gbp->dont_learn)
1185                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1186 
1187         if (gbp->policy_applied)
1188                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1189 
1190         /* In flow-based mode, GBP is carried in dst_metadata */
1191         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1192                 skb->mark = md->gbp;
1193 out:
1194         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1195 }
1196 
1197 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1198                                 __be16 *protocol,
1199                                 struct sk_buff *skb, u32 vxflags)
1200 {
1201         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1202 
1203         /* Need to have Next Protocol set for interfaces in GPE mode. */
1204         if (!gpe->np_applied)
1205                 return false;
1206         /* "The initial version is 0. If a receiver does not support the
1207          * version indicated it MUST drop the packet.
1208          */
1209         if (gpe->version != 0)
1210                 return false;
1211         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1212          * processing MUST occur." However, we don't implement OAM
1213          * processing, thus drop the packet.
1214          */
1215         if (gpe->oam_flag)
1216                 return false;
1217 
1218         switch (gpe->next_protocol) {
1219         case VXLAN_GPE_NP_IPV4:
1220                 *protocol = htons(ETH_P_IP);
1221                 break;
1222         case VXLAN_GPE_NP_IPV6:
1223                 *protocol = htons(ETH_P_IPV6);
1224                 break;
1225         case VXLAN_GPE_NP_ETHERNET:
1226                 *protocol = htons(ETH_P_TEB);
1227                 break;
1228         default:
1229                 return false;
1230         }
1231 
1232         unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1233         return true;
1234 }
1235 
1236 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1237                           struct vxlan_sock *vs,
1238                           struct sk_buff *skb)
1239 {
1240         union vxlan_addr saddr;
1241 
1242         skb_reset_mac_header(skb);
1243         skb->protocol = eth_type_trans(skb, vxlan->dev);
1244         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1245 
1246         /* Ignore packet loops (and multicast echo) */
1247         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1248                 return false;
1249 
1250         /* Get address from the outer IP header */
1251         if (vxlan_get_sk_family(vs) == AF_INET) {
1252                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1253                 saddr.sa.sa_family = AF_INET;
1254 #if IS_ENABLED(CONFIG_IPV6)
1255         } else {
1256                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1257                 saddr.sa.sa_family = AF_INET6;
1258 #endif
1259         }
1260 
1261         if ((vxlan->flags & VXLAN_F_LEARN) &&
1262             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1263                 return false;
1264 
1265         return true;
1266 }
1267 
1268 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1269                                   struct sk_buff *skb)
1270 {
1271         int err = 0;
1272 
1273         if (vxlan_get_sk_family(vs) == AF_INET)
1274                 err = IP_ECN_decapsulate(oiph, skb);
1275 #if IS_ENABLED(CONFIG_IPV6)
1276         else
1277                 err = IP6_ECN_decapsulate(oiph, skb);
1278 #endif
1279 
1280         if (unlikely(err) && log_ecn_error) {
1281                 if (vxlan_get_sk_family(vs) == AF_INET)
1282                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1283                                              &((struct iphdr *)oiph)->saddr,
1284                                              ((struct iphdr *)oiph)->tos);
1285                 else
1286                         net_info_ratelimited("non-ECT from %pI6\n",
1287                                              &((struct ipv6hdr *)oiph)->saddr);
1288         }
1289         return err <= 1;
1290 }
1291 
1292 /* Callback from net/ipv4/udp.c to receive packets */
1293 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1294 {
1295         struct pcpu_sw_netstats *stats;
1296         struct vxlan_dev *vxlan;
1297         struct vxlan_sock *vs;
1298         struct vxlanhdr unparsed;
1299         struct vxlan_metadata _md;
1300         struct vxlan_metadata *md = &_md;
1301         __be16 protocol = htons(ETH_P_TEB);
1302         bool raw_proto = false;
1303         void *oiph;
1304 
1305         /* Need UDP and VXLAN header to be present */
1306         if (!pskb_may_pull(skb, VXLAN_HLEN))
1307                 goto drop;
1308 
1309         unparsed = *vxlan_hdr(skb);
1310         /* VNI flag always required to be set */
1311         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1312                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1313                            ntohl(vxlan_hdr(skb)->vx_flags),
1314                            ntohl(vxlan_hdr(skb)->vx_vni));
1315                 /* Return non vxlan pkt */
1316                 goto drop;
1317         }
1318         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1319         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1320 
1321         vs = rcu_dereference_sk_user_data(sk);
1322         if (!vs)
1323                 goto drop;
1324 
1325         vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1326         if (!vxlan)
1327                 goto drop;
1328 
1329         /* For backwards compatibility, only allow reserved fields to be
1330          * used by VXLAN extensions if explicitly requested.
1331          */
1332         if (vs->flags & VXLAN_F_GPE) {
1333                 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1334                         goto drop;
1335                 raw_proto = true;
1336         }
1337 
1338         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1339                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1340                         goto drop;
1341 
1342         if (vxlan_collect_metadata(vs)) {
1343                 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1344                 struct metadata_dst *tun_dst;
1345 
1346                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1347                                          vxlan_vni_to_tun_id(vni), sizeof(*md));
1348 
1349                 if (!tun_dst)
1350                         goto drop;
1351 
1352                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1353 
1354                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1355         } else {
1356                 memset(md, 0, sizeof(*md));
1357         }
1358 
1359         if (vs->flags & VXLAN_F_REMCSUM_RX)
1360                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1361                         goto drop;
1362         if (vs->flags & VXLAN_F_GBP)
1363                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1364         /* Note that GBP and GPE can never be active together. This is
1365          * ensured in vxlan_dev_configure.
1366          */
1367 
1368         if (unparsed.vx_flags || unparsed.vx_vni) {
1369                 /* If there are any unprocessed flags remaining treat
1370                  * this as a malformed packet. This behavior diverges from
1371                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1372                  * in reserved fields are to be ignored. The approach here
1373                  * maintains compatibility with previous stack code, and also
1374                  * is more robust and provides a little more security in
1375                  * adding extensions to VXLAN.
1376                  */
1377                 goto drop;
1378         }
1379 
1380         if (!raw_proto) {
1381                 if (!vxlan_set_mac(vxlan, vs, skb))
1382                         goto drop;
1383         } else {
1384                 skb_reset_mac_header(skb);
1385                 skb->dev = vxlan->dev;
1386                 skb->pkt_type = PACKET_HOST;
1387         }
1388 
1389         oiph = skb_network_header(skb);
1390         skb_reset_network_header(skb);
1391 
1392         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1393                 ++vxlan->dev->stats.rx_frame_errors;
1394                 ++vxlan->dev->stats.rx_errors;
1395                 goto drop;
1396         }
1397 
1398         stats = this_cpu_ptr(vxlan->dev->tstats);
1399         u64_stats_update_begin(&stats->syncp);
1400         stats->rx_packets++;
1401         stats->rx_bytes += skb->len;
1402         u64_stats_update_end(&stats->syncp);
1403 
1404         gro_cells_receive(&vxlan->gro_cells, skb);
1405         return 0;
1406 
1407 drop:
1408         /* Consume bad packet */
1409         kfree_skb(skb);
1410         return 0;
1411 }
1412 
1413 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1414 {
1415         struct vxlan_dev *vxlan = netdev_priv(dev);
1416         struct arphdr *parp;
1417         u8 *arpptr, *sha;
1418         __be32 sip, tip;
1419         struct neighbour *n;
1420 
1421         if (dev->flags & IFF_NOARP)
1422                 goto out;
1423 
1424         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1425                 dev->stats.tx_dropped++;
1426                 goto out;
1427         }
1428         parp = arp_hdr(skb);
1429 
1430         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1431              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1432             parp->ar_pro != htons(ETH_P_IP) ||
1433             parp->ar_op != htons(ARPOP_REQUEST) ||
1434             parp->ar_hln != dev->addr_len ||
1435             parp->ar_pln != 4)
1436                 goto out;
1437         arpptr = (u8 *)parp + sizeof(struct arphdr);
1438         sha = arpptr;
1439         arpptr += dev->addr_len;        /* sha */
1440         memcpy(&sip, arpptr, sizeof(sip));
1441         arpptr += sizeof(sip);
1442         arpptr += dev->addr_len;        /* tha */
1443         memcpy(&tip, arpptr, sizeof(tip));
1444 
1445         if (ipv4_is_loopback(tip) ||
1446             ipv4_is_multicast(tip))
1447                 goto out;
1448 
1449         n = neigh_lookup(&arp_tbl, &tip, dev);
1450 
1451         if (n) {
1452                 struct vxlan_fdb *f;
1453                 struct sk_buff  *reply;
1454 
1455                 if (!(n->nud_state & NUD_CONNECTED)) {
1456                         neigh_release(n);
1457                         goto out;
1458                 }
1459 
1460                 f = vxlan_find_mac(vxlan, n->ha);
1461                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1462                         /* bridge-local neighbor */
1463                         neigh_release(n);
1464                         goto out;
1465                 }
1466 
1467                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1468                                 n->ha, sha);
1469 
1470                 neigh_release(n);
1471 
1472                 if (reply == NULL)
1473                         goto out;
1474 
1475                 skb_reset_mac_header(reply);
1476                 __skb_pull(reply, skb_network_offset(reply));
1477                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1478                 reply->pkt_type = PACKET_HOST;
1479 
1480                 if (netif_rx_ni(reply) == NET_RX_DROP)
1481                         dev->stats.rx_dropped++;
1482         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1483                 union vxlan_addr ipa = {
1484                         .sin.sin_addr.s_addr = tip,
1485                         .sin.sin_family = AF_INET,
1486                 };
1487 
1488                 vxlan_ip_miss(dev, &ipa);
1489         }
1490 out:
1491         consume_skb(skb);
1492         return NETDEV_TX_OK;
1493 }
1494 
1495 #if IS_ENABLED(CONFIG_IPV6)
1496 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1497         struct neighbour *n, bool isrouter)
1498 {
1499         struct net_device *dev = request->dev;
1500         struct sk_buff *reply;
1501         struct nd_msg *ns, *na;
1502         struct ipv6hdr *pip6;
1503         u8 *daddr;
1504         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1505         int ns_olen;
1506         int i, len;
1507 
1508         if (dev == NULL)
1509                 return NULL;
1510 
1511         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1512                 sizeof(*na) + na_olen + dev->needed_tailroom;
1513         reply = alloc_skb(len, GFP_ATOMIC);
1514         if (reply == NULL)
1515                 return NULL;
1516 
1517         reply->protocol = htons(ETH_P_IPV6);
1518         reply->dev = dev;
1519         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1520         skb_push(reply, sizeof(struct ethhdr));
1521         skb_reset_mac_header(reply);
1522 
1523         ns = (struct nd_msg *)skb_transport_header(request);
1524 
1525         daddr = eth_hdr(request)->h_source;
1526         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1527         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1528                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1529                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1530                         break;
1531                 }
1532         }
1533 
1534         /* Ethernet header */
1535         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1536         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1537         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1538         reply->protocol = htons(ETH_P_IPV6);
1539 
1540         skb_pull(reply, sizeof(struct ethhdr));
1541         skb_reset_network_header(reply);
1542         skb_put(reply, sizeof(struct ipv6hdr));
1543 
1544         /* IPv6 header */
1545 
1546         pip6 = ipv6_hdr(reply);
1547         memset(pip6, 0, sizeof(struct ipv6hdr));
1548         pip6->version = 6;
1549         pip6->priority = ipv6_hdr(request)->priority;
1550         pip6->nexthdr = IPPROTO_ICMPV6;
1551         pip6->hop_limit = 255;
1552         pip6->daddr = ipv6_hdr(request)->saddr;
1553         pip6->saddr = *(struct in6_addr *)n->primary_key;
1554 
1555         skb_pull(reply, sizeof(struct ipv6hdr));
1556         skb_reset_transport_header(reply);
1557 
1558         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1559 
1560         /* Neighbor Advertisement */
1561         memset(na, 0, sizeof(*na)+na_olen);
1562         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1563         na->icmph.icmp6_router = isrouter;
1564         na->icmph.icmp6_override = 1;
1565         na->icmph.icmp6_solicited = 1;
1566         na->target = ns->target;
1567         ether_addr_copy(&na->opt[2], n->ha);
1568         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1569         na->opt[1] = na_olen >> 3;
1570 
1571         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1572                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1573                 csum_partial(na, sizeof(*na)+na_olen, 0));
1574 
1575         pip6->payload_len = htons(sizeof(*na)+na_olen);
1576 
1577         skb_push(reply, sizeof(struct ipv6hdr));
1578 
1579         reply->ip_summed = CHECKSUM_UNNECESSARY;
1580 
1581         return reply;
1582 }
1583 
1584 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1585 {
1586         struct vxlan_dev *vxlan = netdev_priv(dev);
1587         struct nd_msg *msg;
1588         const struct ipv6hdr *iphdr;
1589         const struct in6_addr *saddr, *daddr;
1590         struct neighbour *n;
1591         struct inet6_dev *in6_dev;
1592 
1593         in6_dev = __in6_dev_get(dev);
1594         if (!in6_dev)
1595                 goto out;
1596 
1597         iphdr = ipv6_hdr(skb);
1598         saddr = &iphdr->saddr;
1599         daddr = &iphdr->daddr;
1600 
1601         msg = (struct nd_msg *)skb_transport_header(skb);
1602         if (msg->icmph.icmp6_code != 0 ||
1603             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1604                 goto out;
1605 
1606         if (ipv6_addr_loopback(daddr) ||
1607             ipv6_addr_is_multicast(&msg->target))
1608                 goto out;
1609 
1610         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1611 
1612         if (n) {
1613                 struct vxlan_fdb *f;
1614                 struct sk_buff *reply;
1615 
1616                 if (!(n->nud_state & NUD_CONNECTED)) {
1617                         neigh_release(n);
1618                         goto out;
1619                 }
1620 
1621                 f = vxlan_find_mac(vxlan, n->ha);
1622                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1623                         /* bridge-local neighbor */
1624                         neigh_release(n);
1625                         goto out;
1626                 }
1627 
1628                 reply = vxlan_na_create(skb, n,
1629                                         !!(f ? f->flags & NTF_ROUTER : 0));
1630 
1631                 neigh_release(n);
1632 
1633                 if (reply == NULL)
1634                         goto out;
1635 
1636                 if (netif_rx_ni(reply) == NET_RX_DROP)
1637                         dev->stats.rx_dropped++;
1638 
1639         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1640                 union vxlan_addr ipa = {
1641                         .sin6.sin6_addr = msg->target,
1642                         .sin6.sin6_family = AF_INET6,
1643                 };
1644 
1645                 vxlan_ip_miss(dev, &ipa);
1646         }
1647 
1648 out:
1649         consume_skb(skb);
1650         return NETDEV_TX_OK;
1651 }
1652 #endif
1653 
1654 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1655 {
1656         struct vxlan_dev *vxlan = netdev_priv(dev);
1657         struct neighbour *n;
1658 
1659         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1660                 return false;
1661 
1662         n = NULL;
1663         switch (ntohs(eth_hdr(skb)->h_proto)) {
1664         case ETH_P_IP:
1665         {
1666                 struct iphdr *pip;
1667 
1668                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1669                         return false;
1670                 pip = ip_hdr(skb);
1671                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1672                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1673                         union vxlan_addr ipa = {
1674                                 .sin.sin_addr.s_addr = pip->daddr,
1675                                 .sin.sin_family = AF_INET,
1676                         };
1677 
1678                         vxlan_ip_miss(dev, &ipa);
1679                         return false;
1680                 }
1681 
1682                 break;
1683         }
1684 #if IS_ENABLED(CONFIG_IPV6)
1685         case ETH_P_IPV6:
1686         {
1687                 struct ipv6hdr *pip6;
1688 
1689                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1690                         return false;
1691                 pip6 = ipv6_hdr(skb);
1692                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1693                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1694                         union vxlan_addr ipa = {
1695                                 .sin6.sin6_addr = pip6->daddr,
1696                                 .sin6.sin6_family = AF_INET6,
1697                         };
1698 
1699                         vxlan_ip_miss(dev, &ipa);
1700                         return false;
1701                 }
1702 
1703                 break;
1704         }
1705 #endif
1706         default:
1707                 return false;
1708         }
1709 
1710         if (n) {
1711                 bool diff;
1712 
1713                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1714                 if (diff) {
1715                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1716                                 dev->addr_len);
1717                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1718                 }
1719                 neigh_release(n);
1720                 return diff;
1721         }
1722 
1723         return false;
1724 }
1725 
1726 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1727                                 struct vxlan_metadata *md)
1728 {
1729         struct vxlanhdr_gbp *gbp;
1730 
1731         if (!md->gbp)
1732                 return;
1733 
1734         gbp = (struct vxlanhdr_gbp *)vxh;
1735         vxh->vx_flags |= VXLAN_HF_GBP;
1736 
1737         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1738                 gbp->dont_learn = 1;
1739 
1740         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1741                 gbp->policy_applied = 1;
1742 
1743         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1744 }
1745 
1746 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1747                                __be16 protocol)
1748 {
1749         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1750 
1751         gpe->np_applied = 1;
1752 
1753         switch (protocol) {
1754         case htons(ETH_P_IP):
1755                 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1756                 return 0;
1757         case htons(ETH_P_IPV6):
1758                 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1759                 return 0;
1760         case htons(ETH_P_TEB):
1761                 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1762                 return 0;
1763         }
1764         return -EPFNOSUPPORT;
1765 }
1766 
1767 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1768                            int iphdr_len, __be32 vni,
1769                            struct vxlan_metadata *md, u32 vxflags,
1770                            bool udp_sum)
1771 {
1772         struct vxlanhdr *vxh;
1773         int min_headroom;
1774         int err;
1775         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1776         __be16 inner_protocol = htons(ETH_P_TEB);
1777 
1778         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1779             skb->ip_summed == CHECKSUM_PARTIAL) {
1780                 int csum_start = skb_checksum_start_offset(skb);
1781 
1782                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1783                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1784                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1785                      skb->csum_offset == offsetof(struct tcphdr, check)))
1786                         type |= SKB_GSO_TUNNEL_REMCSUM;
1787         }
1788 
1789         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1790                         + VXLAN_HLEN + iphdr_len
1791                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1792 
1793         /* Need space for new headers (invalidates iph ptr) */
1794         err = skb_cow_head(skb, min_headroom);
1795         if (unlikely(err))
1796                 goto out_free;
1797 
1798         skb = vlan_hwaccel_push_inside(skb);
1799         if (WARN_ON(!skb))
1800                 return -ENOMEM;
1801 
1802         err = iptunnel_handle_offloads(skb, type);
1803         if (err)
1804                 goto out_free;
1805 
1806         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1807         vxh->vx_flags = VXLAN_HF_VNI;
1808         vxh->vx_vni = vxlan_vni_field(vni);
1809 
1810         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1811                 unsigned int start;
1812 
1813                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1814                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1815                 vxh->vx_flags |= VXLAN_HF_RCO;
1816 
1817                 if (!skb_is_gso(skb)) {
1818                         skb->ip_summed = CHECKSUM_NONE;
1819                         skb->encapsulation = 0;
1820                 }
1821         }
1822 
1823         if (vxflags & VXLAN_F_GBP)
1824                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1825         if (vxflags & VXLAN_F_GPE) {
1826                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1827                 if (err < 0)
1828                         goto out_free;
1829                 inner_protocol = skb->protocol;
1830         }
1831 
1832         skb_set_inner_protocol(skb, inner_protocol);
1833         return 0;
1834 
1835 out_free:
1836         kfree_skb(skb);
1837         return err;
1838 }
1839 
1840 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1841                                       struct sk_buff *skb, int oif, u8 tos,
1842                                       __be32 daddr, __be32 *saddr,
1843                                       struct dst_cache *dst_cache,
1844                                       const struct ip_tunnel_info *info)
1845 {
1846         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1847         struct rtable *rt = NULL;
1848         struct flowi4 fl4;
1849 
1850         if (tos && !info)
1851                 use_cache = false;
1852         if (use_cache) {
1853                 rt = dst_cache_get_ip4(dst_cache, saddr);
1854                 if (rt)
1855                         return rt;
1856         }
1857 
1858         memset(&fl4, 0, sizeof(fl4));
1859         fl4.flowi4_oif = oif;
1860         fl4.flowi4_tos = RT_TOS(tos);
1861         fl4.flowi4_mark = skb->mark;
1862         fl4.flowi4_proto = IPPROTO_UDP;
1863         fl4.daddr = daddr;
1864         fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1865 
1866         rt = ip_route_output_key(vxlan->net, &fl4);
1867         if (!IS_ERR(rt)) {
1868                 *saddr = fl4.saddr;
1869                 if (use_cache)
1870                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1871         }
1872         return rt;
1873 }
1874 
1875 #if IS_ENABLED(CONFIG_IPV6)
1876 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1877                                           struct sk_buff *skb, int oif, u8 tos,
1878                                           __be32 label,
1879                                           const struct in6_addr *daddr,
1880                                           struct in6_addr *saddr,
1881                                           struct dst_cache *dst_cache,
1882                                           const struct ip_tunnel_info *info)
1883 {
1884         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1885         struct dst_entry *ndst;
1886         struct flowi6 fl6;
1887         int err;
1888 
1889         if (tos && !info)
1890                 use_cache = false;
1891         if (use_cache) {
1892                 ndst = dst_cache_get_ip6(dst_cache, saddr);
1893                 if (ndst)
1894                         return ndst;
1895         }
1896 
1897         memset(&fl6, 0, sizeof(fl6));
1898         fl6.flowi6_oif = oif;
1899         fl6.daddr = *daddr;
1900         fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1901         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1902         fl6.flowi6_mark = skb->mark;
1903         fl6.flowi6_proto = IPPROTO_UDP;
1904 
1905         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1906                                          vxlan->vn6_sock->sock->sk,
1907                                          &ndst, &fl6);
1908         if (err < 0)
1909                 return ERR_PTR(err);
1910 
1911         *saddr = fl6.saddr;
1912         if (use_cache)
1913                 dst_cache_set_ip6(dst_cache, ndst, saddr);
1914         return ndst;
1915 }
1916 #endif
1917 
1918 /* Bypass encapsulation if the destination is local */
1919 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1920                                struct vxlan_dev *dst_vxlan)
1921 {
1922         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1923         union vxlan_addr loopback;
1924         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1925         struct net_device *dev = skb->dev;
1926         int len = skb->len;
1927 
1928         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1929         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1930         skb->pkt_type = PACKET_HOST;
1931         skb->encapsulation = 0;
1932         skb->dev = dst_vxlan->dev;
1933         __skb_pull(skb, skb_network_offset(skb));
1934 
1935         if (remote_ip->sa.sa_family == AF_INET) {
1936                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1937                 loopback.sa.sa_family =  AF_INET;
1938 #if IS_ENABLED(CONFIG_IPV6)
1939         } else {
1940                 loopback.sin6.sin6_addr = in6addr_loopback;
1941                 loopback.sa.sa_family =  AF_INET6;
1942 #endif
1943         }
1944 
1945         if (dst_vxlan->flags & VXLAN_F_LEARN)
1946                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1947 
1948         u64_stats_update_begin(&tx_stats->syncp);
1949         tx_stats->tx_packets++;
1950         tx_stats->tx_bytes += len;
1951         u64_stats_update_end(&tx_stats->syncp);
1952 
1953         if (netif_rx(skb) == NET_RX_SUCCESS) {
1954                 u64_stats_update_begin(&rx_stats->syncp);
1955                 rx_stats->rx_packets++;
1956                 rx_stats->rx_bytes += len;
1957                 u64_stats_update_end(&rx_stats->syncp);
1958         } else {
1959                 dev->stats.rx_dropped++;
1960         }
1961 }
1962 
1963 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1964                            struct vxlan_rdst *rdst, bool did_rsc)
1965 {
1966         struct dst_cache *dst_cache;
1967         struct ip_tunnel_info *info;
1968         struct vxlan_dev *vxlan = netdev_priv(dev);
1969         struct sock *sk;
1970         struct rtable *rt = NULL;
1971         const struct iphdr *old_iph;
1972         union vxlan_addr *dst;
1973         union vxlan_addr remote_ip;
1974         struct vxlan_metadata _md;
1975         struct vxlan_metadata *md = &_md;
1976         __be16 src_port = 0, dst_port;
1977         __be32 vni, label;
1978         __be16 df = 0;
1979         __u8 tos, ttl;
1980         int err;
1981         u32 flags = vxlan->flags;
1982         bool udp_sum = false;
1983         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1984 
1985         info = skb_tunnel_info(skb);
1986 
1987         if (rdst) {
1988                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1989                 vni = rdst->remote_vni;
1990                 dst = &rdst->remote_ip;
1991                 dst_cache = &rdst->dst_cache;
1992         } else {
1993                 if (!info) {
1994                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1995                                   dev->name);
1996                         goto drop;
1997                 }
1998                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1999                 vni = vxlan_tun_id_to_vni(info->key.tun_id);
2000                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2001                 if (remote_ip.sa.sa_family == AF_INET)
2002                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2003                 else
2004                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2005                 dst = &remote_ip;
2006                 dst_cache = &info->dst_cache;
2007         }
2008 
2009         if (vxlan_addr_any(dst)) {
2010                 if (did_rsc) {
2011                         /* short-circuited back to local bridge */
2012                         vxlan_encap_bypass(skb, vxlan, vxlan);
2013                         return;
2014                 }
2015                 goto drop;
2016         }
2017 
2018         old_iph = ip_hdr(skb);
2019 
2020         ttl = vxlan->cfg.ttl;
2021         if (!ttl && vxlan_addr_multicast(dst))
2022                 ttl = 1;
2023 
2024         tos = vxlan->cfg.tos;
2025         if (tos == 1)
2026                 tos = ip_tunnel_get_dsfield(old_iph, skb);
2027 
2028         label = vxlan->cfg.label;
2029         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2030                                      vxlan->cfg.port_max, true);
2031 
2032         if (info) {
2033                 ttl = info->key.ttl;
2034                 tos = info->key.tos;
2035                 label = info->key.label;
2036                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2037 
2038                 if (info->options_len)
2039                         md = ip_tunnel_info_opts(info);
2040         } else {
2041                 md->gbp = skb->mark;
2042         }
2043 
2044         if (dst->sa.sa_family == AF_INET) {
2045                 __be32 saddr;
2046 
2047                 if (!vxlan->vn4_sock)
2048                         goto drop;
2049                 sk = vxlan->vn4_sock->sock->sk;
2050 
2051                 rt = vxlan_get_route(vxlan, skb,
2052                                      rdst ? rdst->remote_ifindex : 0, tos,
2053                                      dst->sin.sin_addr.s_addr, &saddr,
2054                                      dst_cache, info);
2055                 if (IS_ERR(rt)) {
2056                         netdev_dbg(dev, "no route to %pI4\n",
2057                                    &dst->sin.sin_addr.s_addr);
2058                         dev->stats.tx_carrier_errors++;
2059                         goto tx_error;
2060                 }
2061 
2062                 if (rt->dst.dev == dev) {
2063                         netdev_dbg(dev, "circular route to %pI4\n",
2064                                    &dst->sin.sin_addr.s_addr);
2065                         dev->stats.collisions++;
2066                         goto rt_tx_error;
2067                 }
2068 
2069                 /* Bypass encapsulation if the destination is local */
2070                 if (rt->rt_flags & RTCF_LOCAL &&
2071                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2072                         struct vxlan_dev *dst_vxlan;
2073 
2074                         ip_rt_put(rt);
2075                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2076                                                    dst->sa.sa_family, dst_port,
2077                                                    vxlan->flags);
2078                         if (!dst_vxlan)
2079                                 goto tx_error;
2080                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2081                         return;
2082                 }
2083 
2084                 if (!info)
2085                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2086                 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2087                         df = htons(IP_DF);
2088 
2089                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2090                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2091                 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2092                                       vni, md, flags, udp_sum);
2093                 if (err < 0)
2094                         goto xmit_tx_error;
2095 
2096                 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2097                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2098                                     src_port, dst_port, xnet, !udp_sum);
2099 #if IS_ENABLED(CONFIG_IPV6)
2100         } else {
2101                 struct dst_entry *ndst;
2102                 struct in6_addr saddr;
2103                 u32 rt6i_flags;
2104 
2105                 if (!vxlan->vn6_sock)
2106                         goto drop;
2107                 sk = vxlan->vn6_sock->sock->sk;
2108 
2109                 ndst = vxlan6_get_route(vxlan, skb,
2110                                         rdst ? rdst->remote_ifindex : 0, tos,
2111                                         label, &dst->sin6.sin6_addr, &saddr,
2112                                         dst_cache, info);
2113                 if (IS_ERR(ndst)) {
2114                         netdev_dbg(dev, "no route to %pI6\n",
2115                                    &dst->sin6.sin6_addr);
2116                         dev->stats.tx_carrier_errors++;
2117                         goto tx_error;
2118                 }
2119 
2120                 if (ndst->dev == dev) {
2121                         netdev_dbg(dev, "circular route to %pI6\n",
2122                                    &dst->sin6.sin6_addr);
2123                         dst_release(ndst);
2124                         dev->stats.collisions++;
2125                         goto tx_error;
2126                 }
2127 
2128                 /* Bypass encapsulation if the destination is local */
2129                 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2130                 if (rt6i_flags & RTF_LOCAL &&
2131                     !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2132                         struct vxlan_dev *dst_vxlan;
2133 
2134                         dst_release(ndst);
2135                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2136                                                    dst->sa.sa_family, dst_port,
2137                                                    vxlan->flags);
2138                         if (!dst_vxlan)
2139                                 goto tx_error;
2140                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2141                         return;
2142                 }
2143 
2144                 if (!info)
2145                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2146 
2147                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2148                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2149                 skb_scrub_packet(skb, xnet);
2150                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2151                                       vni, md, flags, udp_sum);
2152                 if (err < 0) {
2153                         dst_release(ndst);
2154                         return;
2155                 }
2156                 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2157                                      &saddr, &dst->sin6.sin6_addr, tos, ttl,
2158                                      label, src_port, dst_port, !udp_sum);
2159 #endif
2160         }
2161 
2162         return;
2163 
2164 drop:
2165         dev->stats.tx_dropped++;
2166         goto tx_free;
2167 
2168 xmit_tx_error:
2169         /* skb is already freed. */
2170         skb = NULL;
2171 rt_tx_error:
2172         ip_rt_put(rt);
2173 tx_error:
2174         dev->stats.tx_errors++;
2175 tx_free:
2176         dev_kfree_skb(skb);
2177 }
2178 
2179 /* Transmit local packets over Vxlan
2180  *
2181  * Outer IP header inherits ECN and DF from inner header.
2182  * Outer UDP destination is the VXLAN assigned port.
2183  *           source port is based on hash of flow
2184  */
2185 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2186 {
2187         struct vxlan_dev *vxlan = netdev_priv(dev);
2188         const struct ip_tunnel_info *info;
2189         struct ethhdr *eth;
2190         bool did_rsc = false;
2191         struct vxlan_rdst *rdst, *fdst = NULL;
2192         struct vxlan_fdb *f;
2193 
2194         info = skb_tunnel_info(skb);
2195 
2196         skb_reset_mac_header(skb);
2197 
2198         if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2199                 if (info && info->mode & IP_TUNNEL_INFO_TX)
2200                         vxlan_xmit_one(skb, dev, NULL, false);
2201                 else
2202                         kfree_skb(skb);
2203                 return NETDEV_TX_OK;
2204         }
2205 
2206         if (vxlan->flags & VXLAN_F_PROXY) {
2207                 eth = eth_hdr(skb);
2208                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2209                         return arp_reduce(dev, skb);
2210 #if IS_ENABLED(CONFIG_IPV6)
2211                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2212                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2213                                        + sizeof(struct nd_msg)) &&
2214                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2215                                 struct nd_msg *msg;
2216 
2217                                 msg = (struct nd_msg *)skb_transport_header(skb);
2218                                 if (msg->icmph.icmp6_code == 0 &&
2219                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2220                                         return neigh_reduce(dev, skb);
2221                 }
2222 #endif
2223         }
2224 
2225         eth = eth_hdr(skb);
2226         f = vxlan_find_mac(vxlan, eth->h_dest);
2227         did_rsc = false;
2228 
2229         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2230             (ntohs(eth->h_proto) == ETH_P_IP ||
2231              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2232                 did_rsc = route_shortcircuit(dev, skb);
2233                 if (did_rsc)
2234                         f = vxlan_find_mac(vxlan, eth->h_dest);
2235         }
2236 
2237         if (f == NULL) {
2238                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2239                 if (f == NULL) {
2240                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2241                             !is_multicast_ether_addr(eth->h_dest))
2242                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2243 
2244                         dev->stats.tx_dropped++;
2245                         kfree_skb(skb);
2246                         return NETDEV_TX_OK;
2247                 }
2248         }
2249 
2250         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2251                 struct sk_buff *skb1;
2252 
2253                 if (!fdst) {
2254                         fdst = rdst;
2255                         continue;
2256                 }
2257                 skb1 = skb_clone(skb, GFP_ATOMIC);
2258                 if (skb1)
2259                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2260         }
2261 
2262         if (fdst)
2263                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2264         else
2265                 kfree_skb(skb);
2266         return NETDEV_TX_OK;
2267 }
2268 
2269 /* Walk the forwarding table and purge stale entries */
2270 static void vxlan_cleanup(unsigned long arg)
2271 {
2272         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2273         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2274         unsigned int h;
2275 
2276         if (!netif_running(vxlan->dev))
2277                 return;
2278 
2279         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2280                 struct hlist_node *p, *n;
2281 
2282                 spin_lock_bh(&vxlan->hash_lock);
2283                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2284                         struct vxlan_fdb *f
2285                                 = container_of(p, struct vxlan_fdb, hlist);
2286                         unsigned long timeout;
2287 
2288                         if (f->state & NUD_PERMANENT)
2289                                 continue;
2290 
2291                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2292                         if (time_before_eq(timeout, jiffies)) {
2293                                 netdev_dbg(vxlan->dev,
2294                                            "garbage collect %pM\n",
2295                                            f->eth_addr);
2296                                 f->state = NUD_STALE;
2297                                 vxlan_fdb_destroy(vxlan, f);
2298                         } else if (time_before(timeout, next_timer))
2299                                 next_timer = timeout;
2300                 }
2301                 spin_unlock_bh(&vxlan->hash_lock);
2302         }
2303 
2304         mod_timer(&vxlan->age_timer, next_timer);
2305 }
2306 
2307 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2308 {
2309         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2310         __be32 vni = vxlan->default_dst.remote_vni;
2311 
2312         spin_lock(&vn->sock_lock);
2313         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2314         spin_unlock(&vn->sock_lock);
2315 }
2316 
2317 /* Setup stats when device is created */
2318 static int vxlan_init(struct net_device *dev)
2319 {
2320         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2321         if (!dev->tstats)
2322                 return -ENOMEM;
2323 
2324         return 0;
2325 }
2326 
2327 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2328 {
2329         struct vxlan_fdb *f;
2330 
2331         spin_lock_bh(&vxlan->hash_lock);
2332         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2333         if (f)
2334                 vxlan_fdb_destroy(vxlan, f);
2335         spin_unlock_bh(&vxlan->hash_lock);
2336 }
2337 
2338 static void vxlan_uninit(struct net_device *dev)
2339 {
2340         struct vxlan_dev *vxlan = netdev_priv(dev);
2341 
2342         vxlan_fdb_delete_default(vxlan);
2343 
2344         free_percpu(dev->tstats);
2345 }
2346 
2347 /* Start ageing timer and join group when device is brought up */
2348 static int vxlan_open(struct net_device *dev)
2349 {
2350         struct vxlan_dev *vxlan = netdev_priv(dev);
2351         int ret;
2352 
2353         ret = vxlan_sock_add(vxlan);
2354         if (ret < 0)
2355                 return ret;
2356 
2357         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2358                 ret = vxlan_igmp_join(vxlan);
2359                 if (ret == -EADDRINUSE)
2360                         ret = 0;
2361                 if (ret) {
2362                         vxlan_sock_release(vxlan);
2363                         return ret;
2364                 }
2365         }
2366 
2367         if (vxlan->cfg.age_interval)
2368                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2369 
2370         return ret;
2371 }
2372 
2373 /* Purge the forwarding table */
2374 static void vxlan_flush(struct vxlan_dev *vxlan)
2375 {
2376         unsigned int h;
2377 
2378         spin_lock_bh(&vxlan->hash_lock);
2379         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2380                 struct hlist_node *p, *n;
2381                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2382                         struct vxlan_fdb *f
2383                                 = container_of(p, struct vxlan_fdb, hlist);
2384                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2385                         if (!is_zero_ether_addr(f->eth_addr))
2386                                 vxlan_fdb_destroy(vxlan, f);
2387                 }
2388         }
2389         spin_unlock_bh(&vxlan->hash_lock);
2390 }
2391 
2392 /* Cleanup timer and forwarding table on shutdown */
2393 static int vxlan_stop(struct net_device *dev)
2394 {
2395         struct vxlan_dev *vxlan = netdev_priv(dev);
2396         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2397         int ret = 0;
2398 
2399         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2400             !vxlan_group_used(vn, vxlan))
2401                 ret = vxlan_igmp_leave(vxlan);
2402 
2403         del_timer_sync(&vxlan->age_timer);
2404 
2405         vxlan_flush(vxlan);
2406         vxlan_sock_release(vxlan);
2407 
2408         return ret;
2409 }
2410 
2411 /* Stub, nothing needs to be done. */
2412 static void vxlan_set_multicast_list(struct net_device *dev)
2413 {
2414 }
2415 
2416 static int __vxlan_change_mtu(struct net_device *dev,
2417                               struct net_device *lowerdev,
2418                               struct vxlan_rdst *dst, int new_mtu, bool strict)
2419 {
2420         int max_mtu = IP_MAX_MTU;
2421 
2422         if (lowerdev)
2423                 max_mtu = lowerdev->mtu;
2424 
2425         if (dst->remote_ip.sa.sa_family == AF_INET6)
2426                 max_mtu -= VXLAN6_HEADROOM;
2427         else
2428                 max_mtu -= VXLAN_HEADROOM;
2429 
2430         if (new_mtu < 68)
2431                 return -EINVAL;
2432 
2433         if (new_mtu > max_mtu) {
2434                 if (strict)
2435                         return -EINVAL;
2436 
2437                 new_mtu = max_mtu;
2438         }
2439 
2440         dev->mtu = new_mtu;
2441         return 0;
2442 }
2443 
2444 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2445 {
2446         struct vxlan_dev *vxlan = netdev_priv(dev);
2447         struct vxlan_rdst *dst = &vxlan->default_dst;
2448         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2449                                                          dst->remote_ifindex);
2450         return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2451 }
2452 
2453 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2454 {
2455         struct vxlan_dev *vxlan = netdev_priv(dev);
2456         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2457         __be16 sport, dport;
2458 
2459         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2460                                   vxlan->cfg.port_max, true);
2461         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2462 
2463         if (ip_tunnel_info_af(info) == AF_INET) {
2464                 struct rtable *rt;
2465 
2466                 if (!vxlan->vn4_sock)
2467                         return -EINVAL;
2468                 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2469                                      info->key.u.ipv4.dst,
2470                                      &info->key.u.ipv4.src, NULL, info);
2471                 if (IS_ERR(rt))
2472                         return PTR_ERR(rt);
2473                 ip_rt_put(rt);
2474         } else {
2475 #if IS_ENABLED(CONFIG_IPV6)
2476                 struct dst_entry *ndst;
2477 
2478                 if (!vxlan->vn6_sock)
2479                         return -EINVAL;
2480                 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
2481                                         info->key.label, &info->key.u.ipv6.dst,
2482                                         &info->key.u.ipv6.src, NULL, info);
2483                 if (IS_ERR(ndst))
2484                         return PTR_ERR(ndst);
2485                 dst_release(ndst);
2486 #else /* !CONFIG_IPV6 */
2487                 return -EPFNOSUPPORT;
2488 #endif
2489         }
2490         info->key.tp_src = sport;
2491         info->key.tp_dst = dport;
2492         return 0;
2493 }
2494 
2495 static const struct net_device_ops vxlan_netdev_ether_ops = {
2496         .ndo_init               = vxlan_init,
2497         .ndo_uninit             = vxlan_uninit,
2498         .ndo_open               = vxlan_open,
2499         .ndo_stop               = vxlan_stop,
2500         .ndo_start_xmit         = vxlan_xmit,
2501         .ndo_get_stats64        = ip_tunnel_get_stats64,
2502         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2503         .ndo_change_mtu         = vxlan_change_mtu,
2504         .ndo_validate_addr      = eth_validate_addr,
2505         .ndo_set_mac_address    = eth_mac_addr,
2506         .ndo_fdb_add            = vxlan_fdb_add,
2507         .ndo_fdb_del            = vxlan_fdb_delete,
2508         .ndo_fdb_dump           = vxlan_fdb_dump,
2509         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2510 };
2511 
2512 static const struct net_device_ops vxlan_netdev_raw_ops = {
2513         .ndo_init               = vxlan_init,
2514         .ndo_uninit             = vxlan_uninit,
2515         .ndo_open               = vxlan_open,
2516         .ndo_stop               = vxlan_stop,
2517         .ndo_start_xmit         = vxlan_xmit,
2518         .ndo_get_stats64        = ip_tunnel_get_stats64,
2519         .ndo_change_mtu         = vxlan_change_mtu,
2520         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2521 };
2522 
2523 /* Info for udev, that this is a virtual tunnel endpoint */
2524 static struct device_type vxlan_type = {
2525         .name = "vxlan",
2526 };
2527 
2528 /* Calls the ndo_add_vxlan_port of the caller in order to
2529  * supply the listening VXLAN udp ports. Callers are expected
2530  * to implement the ndo_add_vxlan_port.
2531  */
2532 static void vxlan_push_rx_ports(struct net_device *dev)
2533 {
2534         struct vxlan_sock *vs;
2535         struct net *net = dev_net(dev);
2536         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2537         sa_family_t sa_family;
2538         __be16 port;
2539         unsigned int i;
2540 
2541         if (!dev->netdev_ops->ndo_add_vxlan_port)
2542                 return;
2543 
2544         spin_lock(&vn->sock_lock);
2545         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2546                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2547                         port = inet_sk(vs->sock->sk)->inet_sport;
2548                         sa_family = vxlan_get_sk_family(vs);
2549                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2550                                                             port);
2551                 }
2552         }
2553         spin_unlock(&vn->sock_lock);
2554 }
2555 
2556 /* Initialize the device structure. */
2557 static void vxlan_setup(struct net_device *dev)
2558 {
2559         struct vxlan_dev *vxlan = netdev_priv(dev);
2560         unsigned int h;
2561 
2562         eth_hw_addr_random(dev);
2563         ether_setup(dev);
2564 
2565         dev->destructor = free_netdev;
2566         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2567 
2568         dev->features   |= NETIF_F_LLTX;
2569         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2570         dev->features   |= NETIF_F_RXCSUM;
2571         dev->features   |= NETIF_F_GSO_SOFTWARE;
2572 
2573         dev->vlan_features = dev->features;
2574         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2575         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2576         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2577         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2578         netif_keep_dst(dev);
2579         dev->priv_flags |= IFF_NO_QUEUE;
2580 
2581         INIT_LIST_HEAD(&vxlan->next);
2582         spin_lock_init(&vxlan->hash_lock);
2583 
2584         init_timer_deferrable(&vxlan->age_timer);
2585         vxlan->age_timer.function = vxlan_cleanup;
2586         vxlan->age_timer.data = (unsigned long) vxlan;
2587 
2588         vxlan->cfg.dst_port = htons(vxlan_port);
2589 
2590         vxlan->dev = dev;
2591 
2592         gro_cells_init(&vxlan->gro_cells, dev);
2593 
2594         for (h = 0; h < FDB_HASH_SIZE; ++h)
2595                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2596 }
2597 
2598 static void vxlan_ether_setup(struct net_device *dev)
2599 {
2600         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2601         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2602         dev->netdev_ops = &vxlan_netdev_ether_ops;
2603 }
2604 
2605 static void vxlan_raw_setup(struct net_device *dev)
2606 {
2607         dev->header_ops = NULL;
2608         dev->type = ARPHRD_NONE;
2609         dev->hard_header_len = 0;
2610         dev->addr_len = 0;
2611         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2612         dev->netdev_ops = &vxlan_netdev_raw_ops;
2613 }
2614 
2615 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2616         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2617         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2618         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2619         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2620         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2621         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2622         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2623         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2624         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
2625         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2626         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2627         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2628         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2629         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2630         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2631         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2632         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2633         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2634         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2635         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2636         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2637         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2638         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2639         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2640         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2641         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
2642         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2643 };
2644 
2645 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2646 {
2647         if (tb[IFLA_ADDRESS]) {
2648                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2649                         pr_debug("invalid link address (not ethernet)\n");
2650                         return -EINVAL;
2651                 }
2652 
2653                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2654                         pr_debug("invalid all zero ethernet address\n");
2655                         return -EADDRNOTAVAIL;
2656                 }
2657         }
2658 
2659         if (!data)
2660                 return -EINVAL;
2661 
2662         if (data[IFLA_VXLAN_ID]) {
2663                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2664                 if (id >= VXLAN_VID_MASK)
2665                         return -ERANGE;
2666         }
2667 
2668         if (data[IFLA_VXLAN_PORT_RANGE]) {
2669                 const struct ifla_vxlan_port_range *p
2670                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2671 
2672                 if (ntohs(p->high) < ntohs(p->low)) {
2673                         pr_debug("port range %u .. %u not valid\n",
2674                                  ntohs(p->low), ntohs(p->high));
2675                         return -EINVAL;
2676                 }
2677         }
2678 
2679         return 0;
2680 }
2681 
2682 static void vxlan_get_drvinfo(struct net_device *netdev,
2683                               struct ethtool_drvinfo *drvinfo)
2684 {
2685         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2686         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2687 }
2688 
2689 static const struct ethtool_ops vxlan_ethtool_ops = {
2690         .get_drvinfo    = vxlan_get_drvinfo,
2691         .get_link       = ethtool_op_get_link,
2692 };
2693 
2694 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2695                                         __be16 port, u32 flags)
2696 {
2697         struct socket *sock;
2698         struct udp_port_cfg udp_conf;
2699         int err;
2700 
2701         memset(&udp_conf, 0, sizeof(udp_conf));
2702 
2703         if (ipv6) {
2704                 udp_conf.family = AF_INET6;
2705                 udp_conf.use_udp6_rx_checksums =
2706                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2707                 udp_conf.ipv6_v6only = 1;
2708         } else {
2709                 udp_conf.family = AF_INET;
2710         }
2711 
2712         udp_conf.local_udp_port = port;
2713 
2714         /* Open UDP socket */
2715         err = udp_sock_create(net, &udp_conf, &sock);
2716         if (err < 0)
2717                 return ERR_PTR(err);
2718 
2719         return sock;
2720 }
2721 
2722 /* Create new listen socket if needed */
2723 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2724                                               __be16 port, u32 flags)
2725 {
2726         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2727         struct vxlan_sock *vs;
2728         struct socket *sock;
2729         unsigned int h;
2730         struct udp_tunnel_sock_cfg tunnel_cfg;
2731 
2732         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2733         if (!vs)
2734                 return ERR_PTR(-ENOMEM);
2735 
2736         for (h = 0; h < VNI_HASH_SIZE; ++h)
2737                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2738 
2739         sock = vxlan_create_sock(net, ipv6, port, flags);
2740         if (IS_ERR(sock)) {
2741                 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2742                         PTR_ERR(sock));
2743                 kfree(vs);
2744                 return ERR_CAST(sock);
2745         }
2746 
2747         vs->sock = sock;
2748         atomic_set(&vs->refcnt, 1);
2749         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2750 
2751         spin_lock(&vn->sock_lock);
2752         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2753         vxlan_notify_add_rx_port(vs);
2754         spin_unlock(&vn->sock_lock);
2755 
2756         /* Mark socket as an encapsulation socket. */
2757         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2758         tunnel_cfg.sk_user_data = vs;
2759         tunnel_cfg.encap_type = 1;
2760         tunnel_cfg.encap_rcv = vxlan_rcv;
2761         tunnel_cfg.encap_destroy = NULL;
2762         tunnel_cfg.gro_receive = vxlan_gro_receive;
2763         tunnel_cfg.gro_complete = vxlan_gro_complete;
2764 
2765         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2766 
2767         return vs;
2768 }
2769 
2770 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2771 {
2772         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2773         struct vxlan_sock *vs = NULL;
2774 
2775         if (!vxlan->cfg.no_share) {
2776                 spin_lock(&vn->sock_lock);
2777                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2778                                      vxlan->cfg.dst_port, vxlan->flags);
2779                 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2780                         spin_unlock(&vn->sock_lock);
2781                         return -EBUSY;
2782                 }
2783                 spin_unlock(&vn->sock_lock);
2784         }
2785         if (!vs)
2786                 vs = vxlan_socket_create(vxlan->net, ipv6,
2787                                          vxlan->cfg.dst_port, vxlan->flags);
2788         if (IS_ERR(vs))
2789                 return PTR_ERR(vs);
2790 #if IS_ENABLED(CONFIG_IPV6)
2791         if (ipv6)
2792                 vxlan->vn6_sock = vs;
2793         else
2794 #endif
2795                 vxlan->vn4_sock = vs;
2796         vxlan_vs_add_dev(vs, vxlan);
2797         return 0;
2798 }
2799 
2800 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2801 {
2802         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2803         bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2804         int ret = 0;
2805 
2806         vxlan->vn4_sock = NULL;
2807 #if IS_ENABLED(CONFIG_IPV6)
2808         vxlan->vn6_sock = NULL;
2809         if (ipv6 || metadata)
2810                 ret = __vxlan_sock_add(vxlan, true);
2811 #endif
2812         if (!ret && (!ipv6 || metadata))
2813                 ret = __vxlan_sock_add(vxlan, false);
2814         if (ret < 0)
2815                 vxlan_sock_release(vxlan);
2816         return ret;
2817 }
2818 
2819 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2820                                struct vxlan_config *conf)
2821 {
2822         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2823         struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2824         struct vxlan_rdst *dst = &vxlan->default_dst;
2825         unsigned short needed_headroom = ETH_HLEN;
2826         int err;
2827         bool use_ipv6 = false;
2828         __be16 default_port = vxlan->cfg.dst_port;
2829         struct net_device *lowerdev = NULL;
2830 
2831         if (conf->flags & VXLAN_F_GPE) {
2832                 if (conf->flags & ~VXLAN_F_ALLOWED_GPE)
2833                         return -EINVAL;
2834                 /* For now, allow GPE only together with COLLECT_METADATA.
2835                  * This can be relaxed later; in such case, the other side
2836                  * of the PtP link will have to be provided.
2837                  */
2838                 if (!(conf->flags & VXLAN_F_COLLECT_METADATA))
2839                         return -EINVAL;
2840 
2841                 vxlan_raw_setup(dev);
2842         } else {
2843                 vxlan_ether_setup(dev);
2844         }
2845 
2846         vxlan->net = src_net;
2847 
2848         dst->remote_vni = conf->vni;
2849 
2850         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2851 
2852         /* Unless IPv6 is explicitly requested, assume IPv4 */
2853         if (!dst->remote_ip.sa.sa_family)
2854                 dst->remote_ip.sa.sa_family = AF_INET;
2855 
2856         if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2857             vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2858                 if (!IS_ENABLED(CONFIG_IPV6))
2859                         return -EPFNOSUPPORT;
2860                 use_ipv6 = true;
2861                 vxlan->flags |= VXLAN_F_IPV6;
2862         }
2863 
2864         if (conf->label && !use_ipv6) {
2865                 pr_info("label only supported in use with IPv6\n");
2866                 return -EINVAL;
2867         }
2868 
2869         if (conf->remote_ifindex) {
2870                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2871                 dst->remote_ifindex = conf->remote_ifindex;
2872 
2873                 if (!lowerdev) {
2874                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2875                         return -ENODEV;
2876                 }
2877 
2878 #if IS_ENABLED(CONFIG_IPV6)
2879                 if (use_ipv6) {
2880                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2881                         if (idev && idev->cnf.disable_ipv6) {
2882                                 pr_info("IPv6 is disabled via sysctl\n");
2883                                 return -EPERM;
2884                         }
2885                 }
2886 #endif
2887 
2888                 if (!conf->mtu)
2889                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2890 
2891                 needed_headroom = lowerdev->hard_header_len;
2892         }
2893 
2894         if (conf->mtu) {
2895                 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2896                 if (err)
2897                         return err;
2898         }
2899 
2900         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2901                 needed_headroom += VXLAN6_HEADROOM;
2902         else
2903                 needed_headroom += VXLAN_HEADROOM;
2904         dev->needed_headroom = needed_headroom;
2905 
2906         memcpy(&vxlan->cfg, conf, sizeof(*conf));
2907         if (!vxlan->cfg.dst_port) {
2908                 if (conf->flags & VXLAN_F_GPE)
2909                         vxlan->cfg.dst_port = 4790; /* IANA assigned VXLAN-GPE port */
2910                 else
2911                         vxlan->cfg.dst_port = default_port;
2912         }
2913         vxlan->flags |= conf->flags;
2914 
2915         if (!vxlan->cfg.age_interval)
2916                 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2917 
2918         list_for_each_entry(tmp, &vn->vxlan_list, next) {
2919                 if (tmp->cfg.vni == conf->vni &&
2920                     (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2921                      tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2922                     tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2923                     (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2924                     (vxlan->flags & VXLAN_F_RCV_FLAGS))
2925                 return -EEXIST;
2926         }
2927 
2928         dev->ethtool_ops = &vxlan_ethtool_ops;
2929 
2930         /* create an fdb entry for a valid default destination */
2931         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2932                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2933                                        &vxlan->default_dst.remote_ip,
2934                                        NUD_REACHABLE|NUD_PERMANENT,
2935                                        NLM_F_EXCL|NLM_F_CREATE,
2936                                        vxlan->cfg.dst_port,
2937                                        vxlan->default_dst.remote_vni,
2938                                        vxlan->default_dst.remote_ifindex,
2939                                        NTF_SELF);
2940                 if (err)
2941                         return err;
2942         }
2943 
2944         err = register_netdevice(dev);
2945         if (err) {
2946                 vxlan_fdb_delete_default(vxlan);
2947                 return err;
2948         }
2949 
2950         list_add(&vxlan->next, &vn->vxlan_list);
2951 
2952         return 0;
2953 }
2954 
2955 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2956                          struct nlattr *tb[], struct nlattr *data[])
2957 {
2958         struct vxlan_config conf;
2959         int err;
2960 
2961         memset(&conf, 0, sizeof(conf));
2962 
2963         if (data[IFLA_VXLAN_ID])
2964                 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2965 
2966         if (data[IFLA_VXLAN_GROUP]) {
2967                 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2968         } else if (data[IFLA_VXLAN_GROUP6]) {
2969                 if (!IS_ENABLED(CONFIG_IPV6))
2970                         return -EPFNOSUPPORT;
2971 
2972                 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2973                 conf.remote_ip.sa.sa_family = AF_INET6;
2974         }
2975 
2976         if (data[IFLA_VXLAN_LOCAL]) {
2977                 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2978                 conf.saddr.sa.sa_family = AF_INET;
2979         } else if (data[IFLA_VXLAN_LOCAL6]) {
2980                 if (!IS_ENABLED(CONFIG_IPV6))
2981                         return -EPFNOSUPPORT;
2982 
2983                 /* TODO: respect scope id */
2984                 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2985                 conf.saddr.sa.sa_family = AF_INET6;
2986         }
2987 
2988         if (data[IFLA_VXLAN_LINK])
2989                 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2990 
2991         if (data[IFLA_VXLAN_TOS])
2992                 conf.tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2993 
2994         if (data[IFLA_VXLAN_TTL])
2995                 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2996 
2997         if (data[IFLA_VXLAN_LABEL])
2998                 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
2999                              IPV6_FLOWLABEL_MASK;
3000 
3001         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3002                 conf.flags |= VXLAN_F_LEARN;
3003 
3004         if (data[IFLA_VXLAN_AGEING])
3005                 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3006 
3007         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
3008                 conf.flags |= VXLAN_F_PROXY;
3009 
3010         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
3011                 conf.flags |= VXLAN_F_RSC;
3012 
3013         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3014                 conf.flags |= VXLAN_F_L2MISS;
3015 
3016         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3017                 conf.flags |= VXLAN_F_L3MISS;
3018 
3019         if (data[IFLA_VXLAN_LIMIT])
3020                 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3021 
3022         if (data[IFLA_VXLAN_COLLECT_METADATA] &&
3023             nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3024                 conf.flags |= VXLAN_F_COLLECT_METADATA;
3025 
3026         if (data[IFLA_VXLAN_PORT_RANGE]) {
3027                 const struct ifla_vxlan_port_range *p
3028                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3029                 conf.port_min = ntohs(p->low);
3030                 conf.port_max = ntohs(p->high);
3031         }
3032 
3033         if (data[IFLA_VXLAN_PORT])
3034                 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3035 
3036         if (data[IFLA_VXLAN_UDP_CSUM] &&
3037             !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3038                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3039 
3040         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
3041             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3042                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3043 
3044         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3045             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3046                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3047 
3048         if (data[IFLA_VXLAN_REMCSUM_TX] &&
3049             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3050                 conf.flags |= VXLAN_F_REMCSUM_TX;
3051 
3052         if (data[IFLA_VXLAN_REMCSUM_RX] &&
3053             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3054                 conf.flags |= VXLAN_F_REMCSUM_RX;
3055 
3056         if (data[IFLA_VXLAN_GBP])
3057                 conf.flags |= VXLAN_F_GBP;
3058 
3059         if (data[IFLA_VXLAN_GPE])
3060                 conf.flags |= VXLAN_F_GPE;
3061 
3062         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3063                 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3064 
3065         if (tb[IFLA_MTU])
3066                 conf.mtu = nla_get_u32(tb[IFLA_MTU]);
3067 
3068         err = vxlan_dev_configure(src_net, dev, &conf);
3069         switch (err) {
3070         case -ENODEV:
3071                 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
3072                 break;
3073 
3074         case -EPERM:
3075                 pr_info("IPv6 is disabled via sysctl\n");
3076                 break;
3077 
3078         case -EEXIST:
3079                 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
3080                 break;
3081 
3082         case -EINVAL:
3083                 pr_info("unsupported combination of extensions\n");
3084                 break;
3085         }
3086 
3087         return err;
3088 }
3089 
3090 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3091 {
3092         struct vxlan_dev *vxlan = netdev_priv(dev);
3093         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3094 
3095         spin_lock(&vn->sock_lock);
3096         if (!hlist_unhashed(&vxlan->hlist))
3097                 hlist_del_rcu(&vxlan->hlist);
3098         spin_unlock(&vn->sock_lock);
3099 
3100         gro_cells_destroy(&vxlan->gro_cells);
3101         list_del(&vxlan->next);
3102         unregister_netdevice_queue(dev, head);
3103 }
3104 
3105 static size_t vxlan_get_size(const struct net_device *dev)
3106 {
3107 
3108         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
3109                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3110                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3111                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3112                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3113                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3114                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3115                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3116                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3117                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3118                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3119                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3120                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3121                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3122                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3123                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3124                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3125                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3126                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3127                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3128                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3129                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3130                 0;
3131 }
3132 
3133 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3134 {
3135         const struct vxlan_dev *vxlan = netdev_priv(dev);
3136         const struct vxlan_rdst *dst = &vxlan->default_dst;
3137         struct ifla_vxlan_port_range ports = {
3138                 .low =  htons(vxlan->cfg.port_min),
3139                 .high = htons(vxlan->cfg.port_max),
3140         };
3141 
3142         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3143                 goto nla_put_failure;
3144 
3145         if (!vxlan_addr_any(&dst->remote_ip)) {
3146                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3147                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3148                                             dst->remote_ip.sin.sin_addr.s_addr))
3149                                 goto nla_put_failure;
3150 #if IS_ENABLED(CONFIG_IPV6)
3151                 } else {
3152                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3153                                              &dst->remote_ip.sin6.sin6_addr))
3154                                 goto nla_put_failure;
3155 #endif
3156                 }
3157         }
3158 
3159         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3160                 goto nla_put_failure;
3161 
3162         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3163                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3164                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3165                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3166                                 goto nla_put_failure;
3167 #if IS_ENABLED(CONFIG_IPV6)
3168                 } else {
3169                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3170                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3171                                 goto nla_put_failure;
3172 #endif
3173                 }
3174         }
3175 
3176         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3177             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3178             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3179             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3180                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
3181             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3182                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
3183             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3184             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3185                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3186             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3187                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3188             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3189                        !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3190             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3191             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3192             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3193             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3194                         !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3195             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3196                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3197             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3198                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3199             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3200                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3201             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3202                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3203                 goto nla_put_failure;
3204 
3205         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3206                 goto nla_put_failure;
3207 
3208         if (vxlan->flags & VXLAN_F_GBP &&
3209             nla_put_flag(skb, IFLA_VXLAN_GBP))
3210                 goto nla_put_failure;
3211 
3212         if (vxlan->flags & VXLAN_F_GPE &&
3213             nla_put_flag(skb, IFLA_VXLAN_GPE))
3214                 goto nla_put_failure;
3215 
3216         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3217             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3218                 goto nla_put_failure;
3219 
3220         return 0;
3221 
3222 nla_put_failure:
3223         return -EMSGSIZE;
3224 }
3225 
3226 static struct net *vxlan_get_link_net(const struct net_device *dev)
3227 {
3228         struct vxlan_dev *vxlan = netdev_priv(dev);
3229 
3230         return vxlan->net;
3231 }
3232 
3233 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3234         .kind           = "vxlan",
3235         .maxtype        = IFLA_VXLAN_MAX,
3236         .policy         = vxlan_policy,
3237         .priv_size      = sizeof(struct vxlan_dev),
3238         .setup          = vxlan_setup,
3239         .validate       = vxlan_validate,
3240         .newlink        = vxlan_newlink,
3241         .dellink        = vxlan_dellink,
3242         .get_size       = vxlan_get_size,
3243         .fill_info      = vxlan_fill_info,
3244         .get_link_net   = vxlan_get_link_net,
3245 };
3246 
3247 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3248                                     u8 name_assign_type,
3249                                     struct vxlan_config *conf)
3250 {
3251         struct nlattr *tb[IFLA_MAX + 1];
3252         struct net_device *dev;
3253         int err;
3254 
3255         memset(&tb, 0, sizeof(tb));
3256 
3257         dev = rtnl_create_link(net, name, name_assign_type,
3258                                &vxlan_link_ops, tb);
3259         if (IS_ERR(dev))
3260                 return dev;
3261 
3262         err = vxlan_dev_configure(net, dev, conf);
3263         if (err < 0) {
3264                 free_netdev(dev);
3265                 return ERR_PTR(err);
3266         }
3267 
3268         err = rtnl_configure_link(dev, NULL);
3269         if (err < 0) {
3270                 LIST_HEAD(list_kill);
3271 
3272                 vxlan_dellink(dev, &list_kill);
3273                 unregister_netdevice_many(&list_kill);
3274                 return ERR_PTR(err);
3275         }
3276 
3277         return dev;
3278 }
3279 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3280 
3281 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3282                                              struct net_device *dev)
3283 {
3284         struct vxlan_dev *vxlan, *next;
3285         LIST_HEAD(list_kill);
3286 
3287         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3288                 struct vxlan_rdst *dst = &vxlan->default_dst;
3289 
3290                 /* In case we created vxlan device with carrier
3291                  * and we loose the carrier due to module unload
3292                  * we also need to remove vxlan device. In other
3293                  * cases, it's not necessary and remote_ifindex
3294                  * is 0 here, so no matches.
3295                  */
3296                 if (dst->remote_ifindex == dev->ifindex)
3297                         vxlan_dellink(vxlan->dev, &list_kill);
3298         }
3299 
3300         unregister_netdevice_many(&list_kill);
3301 }
3302 
3303 static int vxlan_netdevice_event(struct notifier_block *unused,
3304                                  unsigned long event, void *ptr)
3305 {
3306         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3307         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3308 
3309         if (event == NETDEV_UNREGISTER)
3310                 vxlan_handle_lowerdev_unregister(vn, dev);
3311         else if (event == NETDEV_OFFLOAD_PUSH_VXLAN)
3312                 vxlan_push_rx_ports(dev);
3313 
3314         return NOTIFY_DONE;
3315 }
3316 
3317 static struct notifier_block vxlan_notifier_block __read_mostly = {
3318         .notifier_call = vxlan_netdevice_event,
3319 };
3320 
3321 static __net_init int vxlan_init_net(struct net *net)
3322 {
3323         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3324         unsigned int h;
3325 
3326         INIT_LIST_HEAD(&vn->vxlan_list);
3327         spin_lock_init(&vn->sock_lock);
3328 
3329         for (h = 0; h < PORT_HASH_SIZE; ++h)
3330                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3331 
3332         return 0;
3333 }
3334 
3335 static void __net_exit vxlan_exit_net(struct net *net)
3336 {
3337         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3338         struct vxlan_dev *vxlan, *next;
3339         struct net_device *dev, *aux;
3340         LIST_HEAD(list);
3341 
3342         rtnl_lock();
3343         for_each_netdev_safe(net, dev, aux)
3344                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3345                         unregister_netdevice_queue(dev, &list);
3346 
3347         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3348                 /* If vxlan->dev is in the same netns, it has already been added
3349                  * to the list by the previous loop.
3350                  */
3351                 if (!net_eq(dev_net(vxlan->dev), net)) {
3352                         gro_cells_destroy(&vxlan->gro_cells);
3353                         unregister_netdevice_queue(vxlan->dev, &list);
3354                 }
3355         }
3356 
3357         unregister_netdevice_many(&list);
3358         rtnl_unlock();
3359 }
3360 
3361 static struct pernet_operations vxlan_net_ops = {
3362         .init = vxlan_init_net,
3363         .exit = vxlan_exit_net,
3364         .id   = &vxlan_net_id,
3365         .size = sizeof(struct vxlan_net),
3366 };
3367 
3368 static int __init vxlan_init_module(void)
3369 {
3370         int rc;
3371 
3372         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3373 
3374         rc = register_pernet_subsys(&vxlan_net_ops);
3375         if (rc)
3376                 goto out1;
3377 
3378         rc = register_netdevice_notifier(&vxlan_notifier_block);
3379         if (rc)
3380                 goto out2;
3381 
3382         rc = rtnl_link_register(&vxlan_link_ops);
3383         if (rc)
3384                 goto out3;
3385 
3386         return 0;
3387 out3:
3388         unregister_netdevice_notifier(&vxlan_notifier_block);
3389 out2:
3390         unregister_pernet_subsys(&vxlan_net_ops);
3391 out1:
3392         return rc;
3393 }
3394 late_initcall(vxlan_init_module);
3395 
3396 static void __exit vxlan_cleanup_module(void)
3397 {
3398         rtnl_link_unregister(&vxlan_link_ops);
3399         unregister_netdevice_notifier(&vxlan_notifier_block);
3400         unregister_pernet_subsys(&vxlan_net_ops);
3401         /* rcu_barrier() is called by netns */
3402 }
3403 module_exit(vxlan_cleanup_module);
3404 
3405 MODULE_LICENSE("GPL");
3406 MODULE_VERSION(VXLAN_VERSION);
3407 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3408 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3409 MODULE_ALIAS_RTNL_LINK("vxlan");
3410 

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