Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5

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 #include <net/udp_tunnel.h>
 46 #if IS_ENABLED(CONFIG_IPV6)
 47 #include <net/ipv6.h>
 48 #include <net/addrconf.h>
 49 #include <net/ip6_tunnel.h>
 50 #include <net/ip6_checksum.h>
 51 #endif
 52 #include <net/dst_metadata.h>
 53 
 54 #define VXLAN_VERSION   "0.1"
 55 
 56 #define PORT_HASH_BITS  8
 57 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
 58 #define FDB_AGE_DEFAULT 300 /* 5 min */
 59 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
 60 
 61 /* UDP port for VXLAN traffic.
 62  * The IANA assigned port is 4789, but the Linux default is 8472
 63  * for compatibility with early adopters.
 64  */
 65 static unsigned short vxlan_port __read_mostly = 8472;
 66 module_param_named(udp_port, vxlan_port, ushort, 0444);
 67 MODULE_PARM_DESC(udp_port, "Destination UDP port");
 68 
 69 static bool log_ecn_error = true;
 70 module_param(log_ecn_error, bool, 0644);
 71 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
 72 
 73 static int vxlan_net_id;
 74 static struct rtnl_link_ops vxlan_link_ops;
 75 
 76 static const u8 all_zeros_mac[ETH_ALEN + 2];
 77 
 78 static int vxlan_sock_add(struct vxlan_dev *vxlan);
 79 
 80 /* per-network namespace private data for this module */
 81 struct vxlan_net {
 82         struct list_head  vxlan_list;
 83         struct hlist_head sock_list[PORT_HASH_SIZE];
 84         spinlock_t        sock_lock;
 85 };
 86 
 87 /* Forwarding table entry */
 88 struct vxlan_fdb {
 89         struct hlist_node hlist;        /* linked list of entries */
 90         struct rcu_head   rcu;
 91         unsigned long     updated;      /* jiffies */
 92         unsigned long     used;
 93         struct list_head  remotes;
 94         u8                eth_addr[ETH_ALEN];
 95         u16               state;        /* see ndm_state */
 96         u8                flags;        /* see ndm_flags */
 97 };
 98 
 99 /* salt for hash table */
100 static u32 vxlan_salt __read_mostly;
101 static struct workqueue_struct *vxlan_wq;
102 
103 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
104 {
105         return vs->flags & VXLAN_F_COLLECT_METADATA ||
106                ip_tunnel_collect_metadata();
107 }
108 
109 #if IS_ENABLED(CONFIG_IPV6)
110 static inline
111 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
112 {
113         if (a->sa.sa_family != b->sa.sa_family)
114                 return false;
115         if (a->sa.sa_family == AF_INET6)
116                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
117         else
118                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
119 }
120 
121 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
122 {
123         if (ipa->sa.sa_family == AF_INET6)
124                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
125         else
126                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
127 }
128 
129 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
130 {
131         if (ipa->sa.sa_family == AF_INET6)
132                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
133         else
134                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
135 }
136 
137 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
138 {
139         if (nla_len(nla) >= sizeof(struct in6_addr)) {
140                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
141                 ip->sa.sa_family = AF_INET6;
142                 return 0;
143         } else if (nla_len(nla) >= sizeof(__be32)) {
144                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
145                 ip->sa.sa_family = AF_INET;
146                 return 0;
147         } else {
148                 return -EAFNOSUPPORT;
149         }
150 }
151 
152 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
153                               const union vxlan_addr *ip)
154 {
155         if (ip->sa.sa_family == AF_INET6)
156                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
157         else
158                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
159 }
160 
161 #else /* !CONFIG_IPV6 */
162 
163 static inline
164 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
165 {
166         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
167 }
168 
169 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
170 {
171         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
172 }
173 
174 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
175 {
176         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
177 }
178 
179 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
180 {
181         if (nla_len(nla) >= sizeof(struct in6_addr)) {
182                 return -EAFNOSUPPORT;
183         } else if (nla_len(nla) >= sizeof(__be32)) {
184                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
185                 ip->sa.sa_family = AF_INET;
186                 return 0;
187         } else {
188                 return -EAFNOSUPPORT;
189         }
190 }
191 
192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
193                               const union vxlan_addr *ip)
194 {
195         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
196 }
197 #endif
198 
199 /* Virtual Network hash table head */
200 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
201 {
202         return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
203 }
204 
205 /* Socket hash table head */
206 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
207 {
208         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
209 
210         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
211 }
212 
213 /* First remote destination for a forwarding entry.
214  * Guaranteed to be non-NULL because remotes are never deleted.
215  */
216 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
217 {
218         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
219 }
220 
221 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
222 {
223         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
224 }
225 
226 /* Find VXLAN socket based on network namespace, address family and UDP port
227  * and enabled unshareable flags.
228  */
229 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
230                                           __be16 port, u32 flags)
231 {
232         struct vxlan_sock *vs;
233 
234         flags &= VXLAN_F_RCV_FLAGS;
235 
236         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
237                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
238                     vxlan_get_sk_family(vs) == family &&
239                     vs->flags == flags)
240                         return vs;
241         }
242         return NULL;
243 }
244 
245 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
246 {
247         struct vxlan_dev *vxlan;
248 
249         hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
250                 if (vxlan->default_dst.remote_vni == id)
251                         return vxlan;
252         }
253 
254         return NULL;
255 }
256 
257 /* Look up VNI in a per net namespace table */
258 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
259                                         sa_family_t family, __be16 port,
260                                         u32 flags)
261 {
262         struct vxlan_sock *vs;
263 
264         vs = vxlan_find_sock(net, family, port, flags);
265         if (!vs)
266                 return NULL;
267 
268         return vxlan_vs_find_vni(vs, id);
269 }
270 
271 /* Fill in neighbour message in skbuff. */
272 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
273                           const struct vxlan_fdb *fdb,
274                           u32 portid, u32 seq, int type, unsigned int flags,
275                           const struct vxlan_rdst *rdst)
276 {
277         unsigned long now = jiffies;
278         struct nda_cacheinfo ci;
279         struct nlmsghdr *nlh;
280         struct ndmsg *ndm;
281         bool send_ip, send_eth;
282 
283         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
284         if (nlh == NULL)
285                 return -EMSGSIZE;
286 
287         ndm = nlmsg_data(nlh);
288         memset(ndm, 0, sizeof(*ndm));
289 
290         send_eth = send_ip = true;
291 
292         if (type == RTM_GETNEIGH) {
293                 ndm->ndm_family = AF_INET;
294                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
295                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
296         } else
297                 ndm->ndm_family = AF_BRIDGE;
298         ndm->ndm_state = fdb->state;
299         ndm->ndm_ifindex = vxlan->dev->ifindex;
300         ndm->ndm_flags = fdb->flags;
301         ndm->ndm_type = RTN_UNICAST;
302 
303         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
304             nla_put_s32(skb, NDA_LINK_NETNSID,
305                         peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
306                 goto nla_put_failure;
307 
308         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
309                 goto nla_put_failure;
310 
311         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
312                 goto nla_put_failure;
313 
314         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
315             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
316                 goto nla_put_failure;
317         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
318             nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
319                 goto nla_put_failure;
320         if (rdst->remote_ifindex &&
321             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
322                 goto nla_put_failure;
323 
324         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
325         ci.ndm_confirmed = 0;
326         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
327         ci.ndm_refcnt    = 0;
328 
329         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
330                 goto nla_put_failure;
331 
332         nlmsg_end(skb, nlh);
333         return 0;
334 
335 nla_put_failure:
336         nlmsg_cancel(skb, nlh);
337         return -EMSGSIZE;
338 }
339 
340 static inline size_t vxlan_nlmsg_size(void)
341 {
342         return NLMSG_ALIGN(sizeof(struct ndmsg))
343                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
344                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
345                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
346                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
347                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
348                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
349                 + nla_total_size(sizeof(struct nda_cacheinfo));
350 }
351 
352 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
353                              struct vxlan_rdst *rd, int type)
354 {
355         struct net *net = dev_net(vxlan->dev);
356         struct sk_buff *skb;
357         int err = -ENOBUFS;
358 
359         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
360         if (skb == NULL)
361                 goto errout;
362 
363         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
364         if (err < 0) {
365                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
366                 WARN_ON(err == -EMSGSIZE);
367                 kfree_skb(skb);
368                 goto errout;
369         }
370 
371         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
372         return;
373 errout:
374         if (err < 0)
375                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
376 }
377 
378 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
379 {
380         struct vxlan_dev *vxlan = netdev_priv(dev);
381         struct vxlan_fdb f = {
382                 .state = NUD_STALE,
383         };
384         struct vxlan_rdst remote = {
385                 .remote_ip = *ipa, /* goes to NDA_DST */
386                 .remote_vni = VXLAN_N_VID,
387         };
388 
389         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
390 }
391 
392 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
393 {
394         struct vxlan_fdb f = {
395                 .state = NUD_STALE,
396         };
397         struct vxlan_rdst remote = { };
398 
399         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
400 
401         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
402 }
403 
404 /* Hash Ethernet address */
405 static u32 eth_hash(const unsigned char *addr)
406 {
407         u64 value = get_unaligned((u64 *)addr);
408 
409         /* only want 6 bytes */
410 #ifdef __BIG_ENDIAN
411         value >>= 16;
412 #else
413         value <<= 16;
414 #endif
415         return hash_64(value, FDB_HASH_BITS);
416 }
417 
418 /* Hash chain to use given mac address */
419 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
420                                                 const u8 *mac)
421 {
422         return &vxlan->fdb_head[eth_hash(mac)];
423 }
424 
425 /* Look up Ethernet address in forwarding table */
426 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
427                                         const u8 *mac)
428 {
429         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
430         struct vxlan_fdb *f;
431 
432         hlist_for_each_entry_rcu(f, head, hlist) {
433                 if (ether_addr_equal(mac, f->eth_addr))
434                         return f;
435         }
436 
437         return NULL;
438 }
439 
440 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
441                                         const u8 *mac)
442 {
443         struct vxlan_fdb *f;
444 
445         f = __vxlan_find_mac(vxlan, mac);
446         if (f)
447                 f->used = jiffies;
448 
449         return f;
450 }
451 
452 /* caller should hold vxlan->hash_lock */
453 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
454                                               union vxlan_addr *ip, __be16 port,
455                                               __u32 vni, __u32 ifindex)
456 {
457         struct vxlan_rdst *rd;
458 
459         list_for_each_entry(rd, &f->remotes, list) {
460                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
461                     rd->remote_port == port &&
462                     rd->remote_vni == vni &&
463                     rd->remote_ifindex == ifindex)
464                         return rd;
465         }
466 
467         return NULL;
468 }
469 
470 /* Replace destination of unicast mac */
471 static int vxlan_fdb_replace(struct vxlan_fdb *f,
472                              union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
473 {
474         struct vxlan_rdst *rd;
475 
476         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
477         if (rd)
478                 return 0;
479 
480         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
481         if (!rd)
482                 return 0;
483         rd->remote_ip = *ip;
484         rd->remote_port = port;
485         rd->remote_vni = vni;
486         rd->remote_ifindex = ifindex;
487         return 1;
488 }
489 
490 /* Add/update destinations for multicast */
491 static int vxlan_fdb_append(struct vxlan_fdb *f,
492                             union vxlan_addr *ip, __be16 port, __u32 vni,
493                             __u32 ifindex, struct vxlan_rdst **rdp)
494 {
495         struct vxlan_rdst *rd;
496 
497         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
498         if (rd)
499                 return 0;
500 
501         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
502         if (rd == NULL)
503                 return -ENOBUFS;
504         rd->remote_ip = *ip;
505         rd->remote_port = port;
506         rd->remote_vni = vni;
507         rd->remote_ifindex = ifindex;
508 
509         list_add_tail_rcu(&rd->list, &f->remotes);
510 
511         *rdp = rd;
512         return 1;
513 }
514 
515 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
516                                           unsigned int off,
517                                           struct vxlanhdr *vh, size_t hdrlen,
518                                           u32 data, struct gro_remcsum *grc,
519                                           bool nopartial)
520 {
521         size_t start, offset;
522 
523         if (skb->remcsum_offload)
524                 return vh;
525 
526         if (!NAPI_GRO_CB(skb)->csum_valid)
527                 return NULL;
528 
529         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
530         offset = start + ((data & VXLAN_RCO_UDP) ?
531                           offsetof(struct udphdr, check) :
532                           offsetof(struct tcphdr, check));
533 
534         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
535                                      start, offset, grc, nopartial);
536 
537         skb->remcsum_offload = 1;
538 
539         return vh;
540 }
541 
542 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
543                                           struct sk_buff *skb,
544                                           struct udp_offload *uoff)
545 {
546         struct sk_buff *p, **pp = NULL;
547         struct vxlanhdr *vh, *vh2;
548         unsigned int hlen, off_vx;
549         int flush = 1;
550         struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
551                                              udp_offloads);
552         u32 flags;
553         struct gro_remcsum grc;
554 
555         skb_gro_remcsum_init(&grc);
556 
557         off_vx = skb_gro_offset(skb);
558         hlen = off_vx + sizeof(*vh);
559         vh   = skb_gro_header_fast(skb, off_vx);
560         if (skb_gro_header_hard(skb, hlen)) {
561                 vh = skb_gro_header_slow(skb, hlen, off_vx);
562                 if (unlikely(!vh))
563                         goto out;
564         }
565 
566         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
567 
568         flags = ntohl(vh->vx_flags);
569 
570         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
571                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
572                                        ntohl(vh->vx_vni), &grc,
573                                        !!(vs->flags &
574                                           VXLAN_F_REMCSUM_NOPARTIAL));
575 
576                 if (!vh)
577                         goto out;
578         }
579 
580         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
581 
582         flush = 0;
583 
584         for (p = *head; p; p = p->next) {
585                 if (!NAPI_GRO_CB(p)->same_flow)
586                         continue;
587 
588                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
589                 if (vh->vx_flags != vh2->vx_flags ||
590                     vh->vx_vni != vh2->vx_vni) {
591                         NAPI_GRO_CB(p)->same_flow = 0;
592                         continue;
593                 }
594         }
595 
596         pp = eth_gro_receive(head, skb);
597 
598 out:
599         skb_gro_remcsum_cleanup(skb, &grc);
600         NAPI_GRO_CB(skb)->flush |= flush;
601 
602         return pp;
603 }
604 
605 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
606                               struct udp_offload *uoff)
607 {
608         udp_tunnel_gro_complete(skb, nhoff);
609 
610         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
611 }
612 
613 /* Notify netdevs that UDP port started listening */
614 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
615 {
616         struct net_device *dev;
617         struct sock *sk = vs->sock->sk;
618         struct net *net = sock_net(sk);
619         sa_family_t sa_family = vxlan_get_sk_family(vs);
620         __be16 port = inet_sk(sk)->inet_sport;
621         int err;
622 
623         if (sa_family == AF_INET) {
624                 err = udp_add_offload(net, &vs->udp_offloads);
625                 if (err)
626                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
627         }
628 
629         rcu_read_lock();
630         for_each_netdev_rcu(net, dev) {
631                 if (dev->netdev_ops->ndo_add_vxlan_port)
632                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
633                                                             port);
634         }
635         rcu_read_unlock();
636 }
637 
638 /* Notify netdevs that UDP port is no more listening */
639 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
640 {
641         struct net_device *dev;
642         struct sock *sk = vs->sock->sk;
643         struct net *net = sock_net(sk);
644         sa_family_t sa_family = vxlan_get_sk_family(vs);
645         __be16 port = inet_sk(sk)->inet_sport;
646 
647         rcu_read_lock();
648         for_each_netdev_rcu(net, dev) {
649                 if (dev->netdev_ops->ndo_del_vxlan_port)
650                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
651                                                             port);
652         }
653         rcu_read_unlock();
654 
655         if (sa_family == AF_INET)
656                 udp_del_offload(&vs->udp_offloads);
657 }
658 
659 /* Add new entry to forwarding table -- assumes lock held */
660 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
661                             const u8 *mac, union vxlan_addr *ip,
662                             __u16 state, __u16 flags,
663                             __be16 port, __u32 vni, __u32 ifindex,
664                             __u8 ndm_flags)
665 {
666         struct vxlan_rdst *rd = NULL;
667         struct vxlan_fdb *f;
668         int notify = 0;
669 
670         f = __vxlan_find_mac(vxlan, mac);
671         if (f) {
672                 if (flags & NLM_F_EXCL) {
673                         netdev_dbg(vxlan->dev,
674                                    "lost race to create %pM\n", mac);
675                         return -EEXIST;
676                 }
677                 if (f->state != state) {
678                         f->state = state;
679                         f->updated = jiffies;
680                         notify = 1;
681                 }
682                 if (f->flags != ndm_flags) {
683                         f->flags = ndm_flags;
684                         f->updated = jiffies;
685                         notify = 1;
686                 }
687                 if ((flags & NLM_F_REPLACE)) {
688                         /* Only change unicasts */
689                         if (!(is_multicast_ether_addr(f->eth_addr) ||
690                              is_zero_ether_addr(f->eth_addr))) {
691                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
692                                                            ifindex);
693                         } else
694                                 return -EOPNOTSUPP;
695                 }
696                 if ((flags & NLM_F_APPEND) &&
697                     (is_multicast_ether_addr(f->eth_addr) ||
698                      is_zero_ether_addr(f->eth_addr))) {
699                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
700                                                   &rd);
701 
702                         if (rc < 0)
703                                 return rc;
704                         notify |= rc;
705                 }
706         } else {
707                 if (!(flags & NLM_F_CREATE))
708                         return -ENOENT;
709 
710                 if (vxlan->cfg.addrmax &&
711                     vxlan->addrcnt >= vxlan->cfg.addrmax)
712                         return -ENOSPC;
713 
714                 /* Disallow replace to add a multicast entry */
715                 if ((flags & NLM_F_REPLACE) &&
716                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
717                         return -EOPNOTSUPP;
718 
719                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
720                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
721                 if (!f)
722                         return -ENOMEM;
723 
724                 notify = 1;
725                 f->state = state;
726                 f->flags = ndm_flags;
727                 f->updated = f->used = jiffies;
728                 INIT_LIST_HEAD(&f->remotes);
729                 memcpy(f->eth_addr, mac, ETH_ALEN);
730 
731                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
732 
733                 ++vxlan->addrcnt;
734                 hlist_add_head_rcu(&f->hlist,
735                                    vxlan_fdb_head(vxlan, mac));
736         }
737 
738         if (notify) {
739                 if (rd == NULL)
740                         rd = first_remote_rtnl(f);
741                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
742         }
743 
744         return 0;
745 }
746 
747 static void vxlan_fdb_free(struct rcu_head *head)
748 {
749         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
750         struct vxlan_rdst *rd, *nd;
751 
752         list_for_each_entry_safe(rd, nd, &f->remotes, list)
753                 kfree(rd);
754         kfree(f);
755 }
756 
757 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
758 {
759         netdev_dbg(vxlan->dev,
760                     "delete %pM\n", f->eth_addr);
761 
762         --vxlan->addrcnt;
763         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
764 
765         hlist_del_rcu(&f->hlist);
766         call_rcu(&f->rcu, vxlan_fdb_free);
767 }
768 
769 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
770                            union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
771 {
772         struct net *net = dev_net(vxlan->dev);
773         int err;
774 
775         if (tb[NDA_DST]) {
776                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
777                 if (err)
778                         return err;
779         } else {
780                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
781                 if (remote->sa.sa_family == AF_INET) {
782                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
783                         ip->sa.sa_family = AF_INET;
784 #if IS_ENABLED(CONFIG_IPV6)
785                 } else {
786                         ip->sin6.sin6_addr = in6addr_any;
787                         ip->sa.sa_family = AF_INET6;
788 #endif
789                 }
790         }
791 
792         if (tb[NDA_PORT]) {
793                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
794                         return -EINVAL;
795                 *port = nla_get_be16(tb[NDA_PORT]);
796         } else {
797                 *port = vxlan->cfg.dst_port;
798         }
799 
800         if (tb[NDA_VNI]) {
801                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
802                         return -EINVAL;
803                 *vni = nla_get_u32(tb[NDA_VNI]);
804         } else {
805                 *vni = vxlan->default_dst.remote_vni;
806         }
807 
808         if (tb[NDA_IFINDEX]) {
809                 struct net_device *tdev;
810 
811                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
812                         return -EINVAL;
813                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
814                 tdev = __dev_get_by_index(net, *ifindex);
815                 if (!tdev)
816                         return -EADDRNOTAVAIL;
817         } else {
818                 *ifindex = 0;
819         }
820 
821         return 0;
822 }
823 
824 /* Add static entry (via netlink) */
825 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
826                          struct net_device *dev,
827                          const unsigned char *addr, u16 vid, u16 flags)
828 {
829         struct vxlan_dev *vxlan = netdev_priv(dev);
830         /* struct net *net = dev_net(vxlan->dev); */
831         union vxlan_addr ip;
832         __be16 port;
833         u32 vni, ifindex;
834         int err;
835 
836         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
837                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
838                         ndm->ndm_state);
839                 return -EINVAL;
840         }
841 
842         if (tb[NDA_DST] == NULL)
843                 return -EINVAL;
844 
845         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
846         if (err)
847                 return err;
848 
849         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
850                 return -EAFNOSUPPORT;
851 
852         spin_lock_bh(&vxlan->hash_lock);
853         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
854                                port, vni, ifindex, ndm->ndm_flags);
855         spin_unlock_bh(&vxlan->hash_lock);
856 
857         return err;
858 }
859 
860 /* Delete entry (via netlink) */
861 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
862                             struct net_device *dev,
863                             const unsigned char *addr, u16 vid)
864 {
865         struct vxlan_dev *vxlan = netdev_priv(dev);
866         struct vxlan_fdb *f;
867         struct vxlan_rdst *rd = NULL;
868         union vxlan_addr ip;
869         __be16 port;
870         u32 vni, ifindex;
871         int err;
872 
873         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
874         if (err)
875                 return err;
876 
877         err = -ENOENT;
878 
879         spin_lock_bh(&vxlan->hash_lock);
880         f = vxlan_find_mac(vxlan, addr);
881         if (!f)
882                 goto out;
883 
884         if (!vxlan_addr_any(&ip)) {
885                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
886                 if (!rd)
887                         goto out;
888         }
889 
890         err = 0;
891 
892         /* remove a destination if it's not the only one on the list,
893          * otherwise destroy the fdb entry
894          */
895         if (rd && !list_is_singular(&f->remotes)) {
896                 list_del_rcu(&rd->list);
897                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
898                 kfree_rcu(rd, rcu);
899                 goto out;
900         }
901 
902         vxlan_fdb_destroy(vxlan, f);
903 
904 out:
905         spin_unlock_bh(&vxlan->hash_lock);
906 
907         return err;
908 }
909 
910 /* Dump forwarding table */
911 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
912                           struct net_device *dev,
913                           struct net_device *filter_dev, int idx)
914 {
915         struct vxlan_dev *vxlan = netdev_priv(dev);
916         unsigned int h;
917 
918         for (h = 0; h < FDB_HASH_SIZE; ++h) {
919                 struct vxlan_fdb *f;
920                 int err;
921 
922                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
923                         struct vxlan_rdst *rd;
924 
925                         list_for_each_entry_rcu(rd, &f->remotes, list) {
926                                 if (idx < cb->args[0])
927                                         goto skip;
928 
929                                 err = vxlan_fdb_info(skb, vxlan, f,
930                                                      NETLINK_CB(cb->skb).portid,
931                                                      cb->nlh->nlmsg_seq,
932                                                      RTM_NEWNEIGH,
933                                                      NLM_F_MULTI, rd);
934                                 if (err < 0) {
935                                         cb->args[1] = err;
936                                         goto out;
937                                 }
938 skip:
939                                 ++idx;
940                         }
941                 }
942         }
943 out:
944         return idx;
945 }
946 
947 /* Watch incoming packets to learn mapping between Ethernet address
948  * and Tunnel endpoint.
949  * Return true if packet is bogus and should be dropped.
950  */
951 static bool vxlan_snoop(struct net_device *dev,
952                         union vxlan_addr *src_ip, const u8 *src_mac)
953 {
954         struct vxlan_dev *vxlan = netdev_priv(dev);
955         struct vxlan_fdb *f;
956 
957         f = vxlan_find_mac(vxlan, src_mac);
958         if (likely(f)) {
959                 struct vxlan_rdst *rdst = first_remote_rcu(f);
960 
961                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
962                         return false;
963 
964                 /* Don't migrate static entries, drop packets */
965                 if (f->state & NUD_NOARP)
966                         return true;
967 
968                 if (net_ratelimit())
969                         netdev_info(dev,
970                                     "%pM migrated from %pIS to %pIS\n",
971                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
972 
973                 rdst->remote_ip = *src_ip;
974                 f->updated = jiffies;
975                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
976         } else {
977                 /* learned new entry */
978                 spin_lock(&vxlan->hash_lock);
979 
980                 /* close off race between vxlan_flush and incoming packets */
981                 if (netif_running(dev))
982                         vxlan_fdb_create(vxlan, src_mac, src_ip,
983                                          NUD_REACHABLE,
984                                          NLM_F_EXCL|NLM_F_CREATE,
985                                          vxlan->cfg.dst_port,
986                                          vxlan->default_dst.remote_vni,
987                                          0, NTF_SELF);
988                 spin_unlock(&vxlan->hash_lock);
989         }
990 
991         return false;
992 }
993 
994 /* See if multicast group is already in use by other ID */
995 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
996 {
997         struct vxlan_dev *vxlan;
998         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
999 
1000         /* The vxlan_sock is only used by dev, leaving group has
1001          * no effect on other vxlan devices.
1002          */
1003         if (family == AF_INET && dev->vn4_sock &&
1004             atomic_read(&dev->vn4_sock->refcnt) == 1)
1005                 return false;
1006 #if IS_ENABLED(CONFIG_IPV6)
1007         if (family == AF_INET6 && dev->vn6_sock &&
1008             atomic_read(&dev->vn6_sock->refcnt) == 1)
1009                 return false;
1010 #endif
1011 
1012         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1013                 if (!netif_running(vxlan->dev) || vxlan == dev)
1014                         continue;
1015 
1016                 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1017                         continue;
1018 #if IS_ENABLED(CONFIG_IPV6)
1019                 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1020                         continue;
1021 #endif
1022 
1023                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1024                                       &dev->default_dst.remote_ip))
1025                         continue;
1026 
1027                 if (vxlan->default_dst.remote_ifindex !=
1028                     dev->default_dst.remote_ifindex)
1029                         continue;
1030 
1031                 return true;
1032         }
1033 
1034         return false;
1035 }
1036 
1037 static void __vxlan_sock_release(struct vxlan_sock *vs)
1038 {
1039         struct vxlan_net *vn;
1040 
1041         if (!vs)
1042                 return;
1043         if (!atomic_dec_and_test(&vs->refcnt))
1044                 return;
1045 
1046         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1047         spin_lock(&vn->sock_lock);
1048         hlist_del_rcu(&vs->hlist);
1049         vxlan_notify_del_rx_port(vs);
1050         spin_unlock(&vn->sock_lock);
1051 
1052         queue_work(vxlan_wq, &vs->del_work);
1053 }
1054 
1055 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1056 {
1057         __vxlan_sock_release(vxlan->vn4_sock);
1058 #if IS_ENABLED(CONFIG_IPV6)
1059         __vxlan_sock_release(vxlan->vn6_sock);
1060 #endif
1061 }
1062 
1063 /* Update multicast group membership when first VNI on
1064  * multicast address is brought up
1065  */
1066 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1067 {
1068         struct sock *sk;
1069         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1070         int ifindex = vxlan->default_dst.remote_ifindex;
1071         int ret = -EINVAL;
1072 
1073         if (ip->sa.sa_family == AF_INET) {
1074                 struct ip_mreqn mreq = {
1075                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1076                         .imr_ifindex            = ifindex,
1077                 };
1078 
1079                 sk = vxlan->vn4_sock->sock->sk;
1080                 lock_sock(sk);
1081                 ret = ip_mc_join_group(sk, &mreq);
1082                 release_sock(sk);
1083 #if IS_ENABLED(CONFIG_IPV6)
1084         } else {
1085                 sk = vxlan->vn6_sock->sock->sk;
1086                 lock_sock(sk);
1087                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1088                                                    &ip->sin6.sin6_addr);
1089                 release_sock(sk);
1090 #endif
1091         }
1092 
1093         return ret;
1094 }
1095 
1096 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1097 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1098 {
1099         struct sock *sk;
1100         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1101         int ifindex = vxlan->default_dst.remote_ifindex;
1102         int ret = -EINVAL;
1103 
1104         if (ip->sa.sa_family == AF_INET) {
1105                 struct ip_mreqn mreq = {
1106                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1107                         .imr_ifindex            = ifindex,
1108                 };
1109 
1110                 sk = vxlan->vn4_sock->sock->sk;
1111                 lock_sock(sk);
1112                 ret = ip_mc_leave_group(sk, &mreq);
1113                 release_sock(sk);
1114 #if IS_ENABLED(CONFIG_IPV6)
1115         } else {
1116                 sk = vxlan->vn6_sock->sock->sk;
1117                 lock_sock(sk);
1118                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1119                                                    &ip->sin6.sin6_addr);
1120                 release_sock(sk);
1121 #endif
1122         }
1123 
1124         return ret;
1125 }
1126 
1127 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1128                                       size_t hdrlen, u32 data, bool nopartial)
1129 {
1130         size_t start, offset, plen;
1131 
1132         if (skb->remcsum_offload)
1133                 return vh;
1134 
1135         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1136         offset = start + ((data & VXLAN_RCO_UDP) ?
1137                           offsetof(struct udphdr, check) :
1138                           offsetof(struct tcphdr, check));
1139 
1140         plen = hdrlen + offset + sizeof(u16);
1141 
1142         if (!pskb_may_pull(skb, plen))
1143                 return NULL;
1144 
1145         vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1146 
1147         skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1148                             nopartial);
1149 
1150         return vh;
1151 }
1152 
1153 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1154                       struct vxlan_metadata *md, u32 vni,
1155                       struct metadata_dst *tun_dst)
1156 {
1157         struct iphdr *oip = NULL;
1158         struct ipv6hdr *oip6 = NULL;
1159         struct vxlan_dev *vxlan;
1160         struct pcpu_sw_netstats *stats;
1161         union vxlan_addr saddr;
1162         int err = 0;
1163 
1164         /* For flow based devices, map all packets to VNI 0 */
1165         if (vs->flags & VXLAN_F_COLLECT_METADATA)
1166                 vni = 0;
1167 
1168         /* Is this VNI defined? */
1169         vxlan = vxlan_vs_find_vni(vs, vni);
1170         if (!vxlan)
1171                 goto drop;
1172 
1173         skb_reset_mac_header(skb);
1174         skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1175         skb->protocol = eth_type_trans(skb, vxlan->dev);
1176         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1177 
1178         /* Ignore packet loops (and multicast echo) */
1179         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1180                 goto drop;
1181 
1182         /* Get data from the outer IP header */
1183         if (vxlan_get_sk_family(vs) == AF_INET) {
1184                 oip = ip_hdr(skb);
1185                 saddr.sin.sin_addr.s_addr = oip->saddr;
1186                 saddr.sa.sa_family = AF_INET;
1187 #if IS_ENABLED(CONFIG_IPV6)
1188         } else {
1189                 oip6 = ipv6_hdr(skb);
1190                 saddr.sin6.sin6_addr = oip6->saddr;
1191                 saddr.sa.sa_family = AF_INET6;
1192 #endif
1193         }
1194 
1195         if (tun_dst) {
1196                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1197                 tun_dst = NULL;
1198         }
1199 
1200         if ((vxlan->flags & VXLAN_F_LEARN) &&
1201             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1202                 goto drop;
1203 
1204         skb_reset_network_header(skb);
1205         /* In flow-based mode, GBP is carried in dst_metadata */
1206         if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1207                 skb->mark = md->gbp;
1208 
1209         if (oip6)
1210                 err = IP6_ECN_decapsulate(oip6, skb);
1211         if (oip)
1212                 err = IP_ECN_decapsulate(oip, skb);
1213 
1214         if (unlikely(err)) {
1215                 if (log_ecn_error) {
1216                         if (oip6)
1217                                 net_info_ratelimited("non-ECT from %pI6\n",
1218                                                      &oip6->saddr);
1219                         if (oip)
1220                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1221                                                      &oip->saddr, oip->tos);
1222                 }
1223                 if (err > 1) {
1224                         ++vxlan->dev->stats.rx_frame_errors;
1225                         ++vxlan->dev->stats.rx_errors;
1226                         goto drop;
1227                 }
1228         }
1229 
1230         stats = this_cpu_ptr(vxlan->dev->tstats);
1231         u64_stats_update_begin(&stats->syncp);
1232         stats->rx_packets++;
1233         stats->rx_bytes += skb->len;
1234         u64_stats_update_end(&stats->syncp);
1235 
1236         gro_cells_receive(&vxlan->gro_cells, skb);
1237 
1238         return;
1239 drop:
1240         if (tun_dst)
1241                 dst_release((struct dst_entry *)tun_dst);
1242 
1243         /* Consume bad packet */
1244         kfree_skb(skb);
1245 }
1246 
1247 /* Callback from net/ipv4/udp.c to receive packets */
1248 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1249 {
1250         struct metadata_dst *tun_dst = NULL;
1251         struct vxlan_sock *vs;
1252         struct vxlanhdr *vxh;
1253         u32 flags, vni;
1254         struct vxlan_metadata _md;
1255         struct vxlan_metadata *md = &_md;
1256 
1257         /* Need Vxlan and inner Ethernet header to be present */
1258         if (!pskb_may_pull(skb, VXLAN_HLEN))
1259                 goto error;
1260 
1261         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1262         flags = ntohl(vxh->vx_flags);
1263         vni = ntohl(vxh->vx_vni);
1264 
1265         if (flags & VXLAN_HF_VNI) {
1266                 flags &= ~VXLAN_HF_VNI;
1267         } else {
1268                 /* VNI flag always required to be set */
1269                 goto bad_flags;
1270         }
1271 
1272         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1273                 goto drop;
1274         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1275 
1276         vs = rcu_dereference_sk_user_data(sk);
1277         if (!vs)
1278                 goto drop;
1279 
1280         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1281                 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1282                                     !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1283                 if (!vxh)
1284                         goto drop;
1285 
1286                 flags &= ~VXLAN_HF_RCO;
1287                 vni &= VXLAN_VNI_MASK;
1288         }
1289 
1290         if (vxlan_collect_metadata(vs)) {
1291                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1292                                          cpu_to_be64(vni >> 8), sizeof(*md));
1293 
1294                 if (!tun_dst)
1295                         goto drop;
1296 
1297                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1298         } else {
1299                 memset(md, 0, sizeof(*md));
1300         }
1301 
1302         /* For backwards compatibility, only allow reserved fields to be
1303          * used by VXLAN extensions if explicitly requested.
1304          */
1305         if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1306                 struct vxlanhdr_gbp *gbp;
1307 
1308                 gbp = (struct vxlanhdr_gbp *)vxh;
1309                 md->gbp = ntohs(gbp->policy_id);
1310 
1311                 if (tun_dst) {
1312                         tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1313                         tun_dst->u.tun_info.options_len = sizeof(*md);
1314                 }
1315 
1316                 if (gbp->dont_learn)
1317                         md->gbp |= VXLAN_GBP_DONT_LEARN;
1318 
1319                 if (gbp->policy_applied)
1320                         md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1321 
1322                 flags &= ~VXLAN_GBP_USED_BITS;
1323         }
1324 
1325         if (flags || vni & ~VXLAN_VNI_MASK) {
1326                 /* If there are any unprocessed flags remaining treat
1327                  * this as a malformed packet. This behavior diverges from
1328                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1329                  * in reserved fields are to be ignored. The approach here
1330                  * maintains compatibility with previous stack code, and also
1331                  * is more robust and provides a little more security in
1332                  * adding extensions to VXLAN.
1333                  */
1334 
1335                 goto bad_flags;
1336         }
1337 
1338         vxlan_rcv(vs, skb, md, vni >> 8, tun_dst);
1339         return 0;
1340 
1341 drop:
1342         /* Consume bad packet */
1343         kfree_skb(skb);
1344         return 0;
1345 
1346 bad_flags:
1347         netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1348                    ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1349 
1350 error:
1351         if (tun_dst)
1352                 dst_release((struct dst_entry *)tun_dst);
1353 
1354         /* Return non vxlan pkt */
1355         return 1;
1356 }
1357 
1358 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1359 {
1360         struct vxlan_dev *vxlan = netdev_priv(dev);
1361         struct arphdr *parp;
1362         u8 *arpptr, *sha;
1363         __be32 sip, tip;
1364         struct neighbour *n;
1365 
1366         if (dev->flags & IFF_NOARP)
1367                 goto out;
1368 
1369         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1370                 dev->stats.tx_dropped++;
1371                 goto out;
1372         }
1373         parp = arp_hdr(skb);
1374 
1375         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1376              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1377             parp->ar_pro != htons(ETH_P_IP) ||
1378             parp->ar_op != htons(ARPOP_REQUEST) ||
1379             parp->ar_hln != dev->addr_len ||
1380             parp->ar_pln != 4)
1381                 goto out;
1382         arpptr = (u8 *)parp + sizeof(struct arphdr);
1383         sha = arpptr;
1384         arpptr += dev->addr_len;        /* sha */
1385         memcpy(&sip, arpptr, sizeof(sip));
1386         arpptr += sizeof(sip);
1387         arpptr += dev->addr_len;        /* tha */
1388         memcpy(&tip, arpptr, sizeof(tip));
1389 
1390         if (ipv4_is_loopback(tip) ||
1391             ipv4_is_multicast(tip))
1392                 goto out;
1393 
1394         n = neigh_lookup(&arp_tbl, &tip, dev);
1395 
1396         if (n) {
1397                 struct vxlan_fdb *f;
1398                 struct sk_buff  *reply;
1399 
1400                 if (!(n->nud_state & NUD_CONNECTED)) {
1401                         neigh_release(n);
1402                         goto out;
1403                 }
1404 
1405                 f = vxlan_find_mac(vxlan, n->ha);
1406                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1407                         /* bridge-local neighbor */
1408                         neigh_release(n);
1409                         goto out;
1410                 }
1411 
1412                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1413                                 n->ha, sha);
1414 
1415                 neigh_release(n);
1416 
1417                 if (reply == NULL)
1418                         goto out;
1419 
1420                 skb_reset_mac_header(reply);
1421                 __skb_pull(reply, skb_network_offset(reply));
1422                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1423                 reply->pkt_type = PACKET_HOST;
1424 
1425                 if (netif_rx_ni(reply) == NET_RX_DROP)
1426                         dev->stats.rx_dropped++;
1427         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1428                 union vxlan_addr ipa = {
1429                         .sin.sin_addr.s_addr = tip,
1430                         .sin.sin_family = AF_INET,
1431                 };
1432 
1433                 vxlan_ip_miss(dev, &ipa);
1434         }
1435 out:
1436         consume_skb(skb);
1437         return NETDEV_TX_OK;
1438 }
1439 
1440 #if IS_ENABLED(CONFIG_IPV6)
1441 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1442         struct neighbour *n, bool isrouter)
1443 {
1444         struct net_device *dev = request->dev;
1445         struct sk_buff *reply;
1446         struct nd_msg *ns, *na;
1447         struct ipv6hdr *pip6;
1448         u8 *daddr;
1449         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1450         int ns_olen;
1451         int i, len;
1452 
1453         if (dev == NULL)
1454                 return NULL;
1455 
1456         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1457                 sizeof(*na) + na_olen + dev->needed_tailroom;
1458         reply = alloc_skb(len, GFP_ATOMIC);
1459         if (reply == NULL)
1460                 return NULL;
1461 
1462         reply->protocol = htons(ETH_P_IPV6);
1463         reply->dev = dev;
1464         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1465         skb_push(reply, sizeof(struct ethhdr));
1466         skb_set_mac_header(reply, 0);
1467 
1468         ns = (struct nd_msg *)skb_transport_header(request);
1469 
1470         daddr = eth_hdr(request)->h_source;
1471         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1472         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1473                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1474                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1475                         break;
1476                 }
1477         }
1478 
1479         /* Ethernet header */
1480         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1481         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1482         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1483         reply->protocol = htons(ETH_P_IPV6);
1484 
1485         skb_pull(reply, sizeof(struct ethhdr));
1486         skb_set_network_header(reply, 0);
1487         skb_put(reply, sizeof(struct ipv6hdr));
1488 
1489         /* IPv6 header */
1490 
1491         pip6 = ipv6_hdr(reply);
1492         memset(pip6, 0, sizeof(struct ipv6hdr));
1493         pip6->version = 6;
1494         pip6->priority = ipv6_hdr(request)->priority;
1495         pip6->nexthdr = IPPROTO_ICMPV6;
1496         pip6->hop_limit = 255;
1497         pip6->daddr = ipv6_hdr(request)->saddr;
1498         pip6->saddr = *(struct in6_addr *)n->primary_key;
1499 
1500         skb_pull(reply, sizeof(struct ipv6hdr));
1501         skb_set_transport_header(reply, 0);
1502 
1503         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1504 
1505         /* Neighbor Advertisement */
1506         memset(na, 0, sizeof(*na)+na_olen);
1507         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1508         na->icmph.icmp6_router = isrouter;
1509         na->icmph.icmp6_override = 1;
1510         na->icmph.icmp6_solicited = 1;
1511         na->target = ns->target;
1512         ether_addr_copy(&na->opt[2], n->ha);
1513         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1514         na->opt[1] = na_olen >> 3;
1515 
1516         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1517                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1518                 csum_partial(na, sizeof(*na)+na_olen, 0));
1519 
1520         pip6->payload_len = htons(sizeof(*na)+na_olen);
1521 
1522         skb_push(reply, sizeof(struct ipv6hdr));
1523 
1524         reply->ip_summed = CHECKSUM_UNNECESSARY;
1525 
1526         return reply;
1527 }
1528 
1529 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1530 {
1531         struct vxlan_dev *vxlan = netdev_priv(dev);
1532         struct nd_msg *msg;
1533         const struct ipv6hdr *iphdr;
1534         const struct in6_addr *saddr, *daddr;
1535         struct neighbour *n;
1536         struct inet6_dev *in6_dev;
1537 
1538         in6_dev = __in6_dev_get(dev);
1539         if (!in6_dev)
1540                 goto out;
1541 
1542         iphdr = ipv6_hdr(skb);
1543         saddr = &iphdr->saddr;
1544         daddr = &iphdr->daddr;
1545 
1546         msg = (struct nd_msg *)skb_transport_header(skb);
1547         if (msg->icmph.icmp6_code != 0 ||
1548             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1549                 goto out;
1550 
1551         if (ipv6_addr_loopback(daddr) ||
1552             ipv6_addr_is_multicast(&msg->target))
1553                 goto out;
1554 
1555         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1556 
1557         if (n) {
1558                 struct vxlan_fdb *f;
1559                 struct sk_buff *reply;
1560 
1561                 if (!(n->nud_state & NUD_CONNECTED)) {
1562                         neigh_release(n);
1563                         goto out;
1564                 }
1565 
1566                 f = vxlan_find_mac(vxlan, n->ha);
1567                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1568                         /* bridge-local neighbor */
1569                         neigh_release(n);
1570                         goto out;
1571                 }
1572 
1573                 reply = vxlan_na_create(skb, n,
1574                                         !!(f ? f->flags & NTF_ROUTER : 0));
1575 
1576                 neigh_release(n);
1577 
1578                 if (reply == NULL)
1579                         goto out;
1580 
1581                 if (netif_rx_ni(reply) == NET_RX_DROP)
1582                         dev->stats.rx_dropped++;
1583 
1584         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1585                 union vxlan_addr ipa = {
1586                         .sin6.sin6_addr = msg->target,
1587                         .sin6.sin6_family = AF_INET6,
1588                 };
1589 
1590                 vxlan_ip_miss(dev, &ipa);
1591         }
1592 
1593 out:
1594         consume_skb(skb);
1595         return NETDEV_TX_OK;
1596 }
1597 #endif
1598 
1599 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1600 {
1601         struct vxlan_dev *vxlan = netdev_priv(dev);
1602         struct neighbour *n;
1603 
1604         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1605                 return false;
1606 
1607         n = NULL;
1608         switch (ntohs(eth_hdr(skb)->h_proto)) {
1609         case ETH_P_IP:
1610         {
1611                 struct iphdr *pip;
1612 
1613                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1614                         return false;
1615                 pip = ip_hdr(skb);
1616                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1617                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1618                         union vxlan_addr ipa = {
1619                                 .sin.sin_addr.s_addr = pip->daddr,
1620                                 .sin.sin_family = AF_INET,
1621                         };
1622 
1623                         vxlan_ip_miss(dev, &ipa);
1624                         return false;
1625                 }
1626 
1627                 break;
1628         }
1629 #if IS_ENABLED(CONFIG_IPV6)
1630         case ETH_P_IPV6:
1631         {
1632                 struct ipv6hdr *pip6;
1633 
1634                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1635                         return false;
1636                 pip6 = ipv6_hdr(skb);
1637                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1638                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1639                         union vxlan_addr ipa = {
1640                                 .sin6.sin6_addr = pip6->daddr,
1641                                 .sin6.sin6_family = AF_INET6,
1642                         };
1643 
1644                         vxlan_ip_miss(dev, &ipa);
1645                         return false;
1646                 }
1647 
1648                 break;
1649         }
1650 #endif
1651         default:
1652                 return false;
1653         }
1654 
1655         if (n) {
1656                 bool diff;
1657 
1658                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1659                 if (diff) {
1660                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1661                                 dev->addr_len);
1662                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1663                 }
1664                 neigh_release(n);
1665                 return diff;
1666         }
1667 
1668         return false;
1669 }
1670 
1671 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1672                                 struct vxlan_metadata *md)
1673 {
1674         struct vxlanhdr_gbp *gbp;
1675 
1676         if (!md->gbp)
1677                 return;
1678 
1679         gbp = (struct vxlanhdr_gbp *)vxh;
1680         vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1681 
1682         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1683                 gbp->dont_learn = 1;
1684 
1685         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1686                 gbp->policy_applied = 1;
1687 
1688         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1689 }
1690 
1691 #if IS_ENABLED(CONFIG_IPV6)
1692 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1693                            struct sk_buff *skb,
1694                            struct net_device *dev, struct in6_addr *saddr,
1695                            struct in6_addr *daddr, __u8 prio, __u8 ttl,
1696                            __be16 src_port, __be16 dst_port, __be32 vni,
1697                            struct vxlan_metadata *md, bool xnet, u32 vxflags)
1698 {
1699         struct vxlanhdr *vxh;
1700         int min_headroom;
1701         int err;
1702         bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1703         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1704         u16 hdrlen = sizeof(struct vxlanhdr);
1705 
1706         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1707             skb->ip_summed == CHECKSUM_PARTIAL) {
1708                 int csum_start = skb_checksum_start_offset(skb);
1709 
1710                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1711                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1712                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1713                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1714                         udp_sum = false;
1715                         type |= SKB_GSO_TUNNEL_REMCSUM;
1716                 }
1717         }
1718 
1719         skb_scrub_packet(skb, xnet);
1720 
1721         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1722                         + VXLAN_HLEN + sizeof(struct ipv6hdr)
1723                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1724 
1725         /* Need space for new headers (invalidates iph ptr) */
1726         err = skb_cow_head(skb, min_headroom);
1727         if (unlikely(err)) {
1728                 kfree_skb(skb);
1729                 goto err;
1730         }
1731 
1732         skb = vlan_hwaccel_push_inside(skb);
1733         if (WARN_ON(!skb)) {
1734                 err = -ENOMEM;
1735                 goto err;
1736         }
1737 
1738         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1739         if (IS_ERR(skb)) {
1740                 err = -EINVAL;
1741                 goto err;
1742         }
1743 
1744         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1745         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1746         vxh->vx_vni = vni;
1747 
1748         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1749                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1750                            VXLAN_RCO_SHIFT;
1751 
1752                 if (skb->csum_offset == offsetof(struct udphdr, check))
1753                         data |= VXLAN_RCO_UDP;
1754 
1755                 vxh->vx_vni |= htonl(data);
1756                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1757 
1758                 if (!skb_is_gso(skb)) {
1759                         skb->ip_summed = CHECKSUM_NONE;
1760                         skb->encapsulation = 0;
1761                 }
1762         }
1763 
1764         if (vxflags & VXLAN_F_GBP)
1765                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1766 
1767         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1768 
1769         udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1770                              ttl, src_port, dst_port,
1771                              !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1772         return 0;
1773 err:
1774         dst_release(dst);
1775         return err;
1776 }
1777 #endif
1778 
1779 static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
1780                           __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1781                           __be16 src_port, __be16 dst_port, __be32 vni,
1782                           struct vxlan_metadata *md, bool xnet, u32 vxflags)
1783 {
1784         struct vxlanhdr *vxh;
1785         int min_headroom;
1786         int err;
1787         bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1788         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1789         u16 hdrlen = sizeof(struct vxlanhdr);
1790 
1791         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1792             skb->ip_summed == CHECKSUM_PARTIAL) {
1793                 int csum_start = skb_checksum_start_offset(skb);
1794 
1795                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1796                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1797                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1798                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1799                         udp_sum = false;
1800                         type |= SKB_GSO_TUNNEL_REMCSUM;
1801                 }
1802         }
1803 
1804         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1805                         + VXLAN_HLEN + sizeof(struct iphdr)
1806                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1807 
1808         /* Need space for new headers (invalidates iph ptr) */
1809         err = skb_cow_head(skb, min_headroom);
1810         if (unlikely(err)) {
1811                 kfree_skb(skb);
1812                 return err;
1813         }
1814 
1815         skb = vlan_hwaccel_push_inside(skb);
1816         if (WARN_ON(!skb))
1817                 return -ENOMEM;
1818 
1819         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1820         if (IS_ERR(skb))
1821                 return PTR_ERR(skb);
1822 
1823         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1824         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1825         vxh->vx_vni = vni;
1826 
1827         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1828                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1829                            VXLAN_RCO_SHIFT;
1830 
1831                 if (skb->csum_offset == offsetof(struct udphdr, check))
1832                         data |= VXLAN_RCO_UDP;
1833 
1834                 vxh->vx_vni |= htonl(data);
1835                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1836 
1837                 if (!skb_is_gso(skb)) {
1838                         skb->ip_summed = CHECKSUM_NONE;
1839                         skb->encapsulation = 0;
1840                 }
1841         }
1842 
1843         if (vxflags & VXLAN_F_GBP)
1844                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1845 
1846         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1847 
1848         udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos, ttl, df,
1849                             src_port, dst_port, xnet,
1850                             !(vxflags & VXLAN_F_UDP_CSUM));
1851         return 0;
1852 }
1853 
1854 #if IS_ENABLED(CONFIG_IPV6)
1855 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1856                                           struct sk_buff *skb, int oif,
1857                                           const struct in6_addr *daddr,
1858                                           struct in6_addr *saddr)
1859 {
1860         struct dst_entry *ndst;
1861         struct flowi6 fl6;
1862         int err;
1863 
1864         memset(&fl6, 0, sizeof(fl6));
1865         fl6.flowi6_oif = oif;
1866         fl6.daddr = *daddr;
1867         fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1868         fl6.flowi6_mark = skb->mark;
1869         fl6.flowi6_proto = IPPROTO_UDP;
1870 
1871         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1872                                          vxlan->vn6_sock->sock->sk,
1873                                          &ndst, &fl6);
1874         if (err < 0)
1875                 return ERR_PTR(err);
1876 
1877         *saddr = fl6.saddr;
1878         return ndst;
1879 }
1880 #endif
1881 
1882 /* Bypass encapsulation if the destination is local */
1883 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1884                                struct vxlan_dev *dst_vxlan)
1885 {
1886         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1887         union vxlan_addr loopback;
1888         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1889         struct net_device *dev = skb->dev;
1890         int len = skb->len;
1891 
1892         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1893         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1894         skb->pkt_type = PACKET_HOST;
1895         skb->encapsulation = 0;
1896         skb->dev = dst_vxlan->dev;
1897         __skb_pull(skb, skb_network_offset(skb));
1898 
1899         if (remote_ip->sa.sa_family == AF_INET) {
1900                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1901                 loopback.sa.sa_family =  AF_INET;
1902 #if IS_ENABLED(CONFIG_IPV6)
1903         } else {
1904                 loopback.sin6.sin6_addr = in6addr_loopback;
1905                 loopback.sa.sa_family =  AF_INET6;
1906 #endif
1907         }
1908 
1909         if (dst_vxlan->flags & VXLAN_F_LEARN)
1910                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1911 
1912         u64_stats_update_begin(&tx_stats->syncp);
1913         tx_stats->tx_packets++;
1914         tx_stats->tx_bytes += len;
1915         u64_stats_update_end(&tx_stats->syncp);
1916 
1917         if (netif_rx(skb) == NET_RX_SUCCESS) {
1918                 u64_stats_update_begin(&rx_stats->syncp);
1919                 rx_stats->rx_packets++;
1920                 rx_stats->rx_bytes += len;
1921                 u64_stats_update_end(&rx_stats->syncp);
1922         } else {
1923                 dev->stats.rx_dropped++;
1924         }
1925 }
1926 
1927 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1928                            struct vxlan_rdst *rdst, bool did_rsc)
1929 {
1930         struct ip_tunnel_info *info;
1931         struct vxlan_dev *vxlan = netdev_priv(dev);
1932         struct sock *sk;
1933         struct rtable *rt = NULL;
1934         const struct iphdr *old_iph;
1935         struct flowi4 fl4;
1936         union vxlan_addr *dst;
1937         union vxlan_addr remote_ip;
1938         struct vxlan_metadata _md;
1939         struct vxlan_metadata *md = &_md;
1940         __be16 src_port = 0, dst_port;
1941         u32 vni;
1942         __be16 df = 0;
1943         __u8 tos, ttl;
1944         int err;
1945         u32 flags = vxlan->flags;
1946 
1947         info = skb_tunnel_info(skb);
1948 
1949         if (rdst) {
1950                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1951                 vni = rdst->remote_vni;
1952                 dst = &rdst->remote_ip;
1953         } else {
1954                 if (!info) {
1955                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1956                                   dev->name);
1957                         goto drop;
1958                 }
1959                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1960                 vni = be64_to_cpu(info->key.tun_id);
1961                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1962                 if (remote_ip.sa.sa_family == AF_INET)
1963                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1964                 else
1965                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1966                 dst = &remote_ip;
1967         }
1968 
1969         if (vxlan_addr_any(dst)) {
1970                 if (did_rsc) {
1971                         /* short-circuited back to local bridge */
1972                         vxlan_encap_bypass(skb, vxlan, vxlan);
1973                         return;
1974                 }
1975                 goto drop;
1976         }
1977 
1978         old_iph = ip_hdr(skb);
1979 
1980         ttl = vxlan->cfg.ttl;
1981         if (!ttl && vxlan_addr_multicast(dst))
1982                 ttl = 1;
1983 
1984         tos = vxlan->cfg.tos;
1985         if (tos == 1)
1986                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1987 
1988         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1989                                      vxlan->cfg.port_max, true);
1990 
1991         if (info) {
1992                 ttl = info->key.ttl;
1993                 tos = info->key.tos;
1994 
1995                 if (info->options_len)
1996                         md = ip_tunnel_info_opts(info);
1997         } else {
1998                 md->gbp = skb->mark;
1999         }
2000 
2001         if (dst->sa.sa_family == AF_INET) {
2002                 if (!vxlan->vn4_sock)
2003                         goto drop;
2004                 sk = vxlan->vn4_sock->sock->sk;
2005 
2006                 if (info) {
2007                         if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2008                                 df = htons(IP_DF);
2009 
2010                         if (info->key.tun_flags & TUNNEL_CSUM)
2011                                 flags |= VXLAN_F_UDP_CSUM;
2012                         else
2013                                 flags &= ~VXLAN_F_UDP_CSUM;
2014                 }
2015 
2016                 memset(&fl4, 0, sizeof(fl4));
2017                 fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
2018                 fl4.flowi4_tos = RT_TOS(tos);
2019                 fl4.flowi4_mark = skb->mark;
2020                 fl4.flowi4_proto = IPPROTO_UDP;
2021                 fl4.daddr = dst->sin.sin_addr.s_addr;
2022                 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
2023 
2024                 rt = ip_route_output_key(vxlan->net, &fl4);
2025                 if (IS_ERR(rt)) {
2026                         netdev_dbg(dev, "no route to %pI4\n",
2027                                    &dst->sin.sin_addr.s_addr);
2028                         dev->stats.tx_carrier_errors++;
2029                         goto tx_error;
2030                 }
2031 
2032                 if (rt->dst.dev == dev) {
2033                         netdev_dbg(dev, "circular route to %pI4\n",
2034                                    &dst->sin.sin_addr.s_addr);
2035                         dev->stats.collisions++;
2036                         goto rt_tx_error;
2037                 }
2038 
2039                 /* Bypass encapsulation if the destination is local */
2040                 if (rt->rt_flags & RTCF_LOCAL &&
2041                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2042                         struct vxlan_dev *dst_vxlan;
2043 
2044                         ip_rt_put(rt);
2045                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2046                                                    dst->sa.sa_family, dst_port,
2047                                                    vxlan->flags);
2048                         if (!dst_vxlan)
2049                                 goto tx_error;
2050                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2051                         return;
2052                 }
2053 
2054                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2055                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2056                 err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
2057                                      dst->sin.sin_addr.s_addr, tos, ttl, df,
2058                                      src_port, dst_port, htonl(vni << 8), md,
2059                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
2060                                      flags);
2061                 if (err < 0) {
2062                         /* skb is already freed. */
2063                         skb = NULL;
2064                         goto rt_tx_error;
2065                 }
2066 #if IS_ENABLED(CONFIG_IPV6)
2067         } else {
2068                 struct dst_entry *ndst;
2069                 struct in6_addr saddr;
2070                 u32 rt6i_flags;
2071 
2072                 if (!vxlan->vn6_sock)
2073                         goto drop;
2074                 sk = vxlan->vn6_sock->sock->sk;
2075 
2076                 ndst = vxlan6_get_route(vxlan, skb,
2077                                         rdst ? rdst->remote_ifindex : 0,
2078                                         &dst->sin6.sin6_addr, &saddr);
2079                 if (IS_ERR(ndst)) {
2080                         netdev_dbg(dev, "no route to %pI6\n",
2081                                    &dst->sin6.sin6_addr);
2082                         dev->stats.tx_carrier_errors++;
2083                         goto tx_error;
2084                 }
2085 
2086                 if (ndst->dev == dev) {
2087                         netdev_dbg(dev, "circular route to %pI6\n",
2088                                    &dst->sin6.sin6_addr);
2089                         dst_release(ndst);
2090                         dev->stats.collisions++;
2091                         goto tx_error;
2092                 }
2093 
2094                 /* Bypass encapsulation if the destination is local */
2095                 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2096                 if (rt6i_flags & RTF_LOCAL &&
2097                     !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2098                         struct vxlan_dev *dst_vxlan;
2099 
2100                         dst_release(ndst);
2101                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2102                                                    dst->sa.sa_family, dst_port,
2103                                                    vxlan->flags);
2104                         if (!dst_vxlan)
2105                                 goto tx_error;
2106                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2107                         return;
2108                 }
2109 
2110                 if (info) {
2111                         if (info->key.tun_flags & TUNNEL_CSUM)
2112                                 flags &= ~VXLAN_F_UDP_ZERO_CSUM6_TX;
2113                         else
2114                                 flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2115                 }
2116 
2117                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2118                 err = vxlan6_xmit_skb(ndst, sk, skb, dev, &saddr, &dst->sin6.sin6_addr,
2119                                       0, ttl, src_port, dst_port, htonl(vni << 8), md,
2120                                       !net_eq(vxlan->net, dev_net(vxlan->dev)),
2121                                       flags);
2122 #endif
2123         }
2124 
2125         return;
2126 
2127 drop:
2128         dev->stats.tx_dropped++;
2129         goto tx_free;
2130 
2131 rt_tx_error:
2132         ip_rt_put(rt);
2133 tx_error:
2134         dev->stats.tx_errors++;
2135 tx_free:
2136         dev_kfree_skb(skb);
2137 }
2138 
2139 /* Transmit local packets over Vxlan
2140  *
2141  * Outer IP header inherits ECN and DF from inner header.
2142  * Outer UDP destination is the VXLAN assigned port.
2143  *           source port is based on hash of flow
2144  */
2145 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2146 {
2147         struct vxlan_dev *vxlan = netdev_priv(dev);
2148         const struct ip_tunnel_info *info;
2149         struct ethhdr *eth;
2150         bool did_rsc = false;
2151         struct vxlan_rdst *rdst, *fdst = NULL;
2152         struct vxlan_fdb *f;
2153 
2154         info = skb_tunnel_info(skb);
2155 
2156         skb_reset_mac_header(skb);
2157         eth = eth_hdr(skb);
2158 
2159         if ((vxlan->flags & VXLAN_F_PROXY)) {
2160                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2161                         return arp_reduce(dev, skb);
2162 #if IS_ENABLED(CONFIG_IPV6)
2163                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2164                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2165                                        + sizeof(struct nd_msg)) &&
2166                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2167                                 struct nd_msg *msg;
2168 
2169                                 msg = (struct nd_msg *)skb_transport_header(skb);
2170                                 if (msg->icmph.icmp6_code == 0 &&
2171                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2172                                         return neigh_reduce(dev, skb);
2173                 }
2174                 eth = eth_hdr(skb);
2175 #endif
2176         }
2177 
2178         if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2179                 if (info && info->mode & IP_TUNNEL_INFO_TX)
2180                         vxlan_xmit_one(skb, dev, NULL, false);
2181                 else
2182                         kfree_skb(skb);
2183                 return NETDEV_TX_OK;
2184         }
2185 
2186         f = vxlan_find_mac(vxlan, eth->h_dest);
2187         did_rsc = false;
2188 
2189         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2190             (ntohs(eth->h_proto) == ETH_P_IP ||
2191              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2192                 did_rsc = route_shortcircuit(dev, skb);
2193                 if (did_rsc)
2194                         f = vxlan_find_mac(vxlan, eth->h_dest);
2195         }
2196 
2197         if (f == NULL) {
2198                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2199                 if (f == NULL) {
2200                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2201                             !is_multicast_ether_addr(eth->h_dest))
2202                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2203 
2204                         dev->stats.tx_dropped++;
2205                         kfree_skb(skb);
2206                         return NETDEV_TX_OK;
2207                 }
2208         }
2209 
2210         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2211                 struct sk_buff *skb1;
2212 
2213                 if (!fdst) {
2214                         fdst = rdst;
2215                         continue;
2216                 }
2217                 skb1 = skb_clone(skb, GFP_ATOMIC);
2218                 if (skb1)
2219                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2220         }
2221 
2222         if (fdst)
2223                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2224         else
2225                 kfree_skb(skb);
2226         return NETDEV_TX_OK;
2227 }
2228 
2229 /* Walk the forwarding table and purge stale entries */
2230 static void vxlan_cleanup(unsigned long arg)
2231 {
2232         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2233         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2234         unsigned int h;
2235 
2236         if (!netif_running(vxlan->dev))
2237                 return;
2238 
2239         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2240                 struct hlist_node *p, *n;
2241 
2242                 spin_lock_bh(&vxlan->hash_lock);
2243                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2244                         struct vxlan_fdb *f
2245                                 = container_of(p, struct vxlan_fdb, hlist);
2246                         unsigned long timeout;
2247 
2248                         if (f->state & NUD_PERMANENT)
2249                                 continue;
2250 
2251                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2252                         if (time_before_eq(timeout, jiffies)) {
2253                                 netdev_dbg(vxlan->dev,
2254                                            "garbage collect %pM\n",
2255                                            f->eth_addr);
2256                                 f->state = NUD_STALE;
2257                                 vxlan_fdb_destroy(vxlan, f);
2258                         } else if (time_before(timeout, next_timer))
2259                                 next_timer = timeout;
2260                 }
2261                 spin_unlock_bh(&vxlan->hash_lock);
2262         }
2263 
2264         mod_timer(&vxlan->age_timer, next_timer);
2265 }
2266 
2267 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2268 {
2269         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2270         __u32 vni = vxlan->default_dst.remote_vni;
2271 
2272         spin_lock(&vn->sock_lock);
2273         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2274         spin_unlock(&vn->sock_lock);
2275 }
2276 
2277 /* Setup stats when device is created */
2278 static int vxlan_init(struct net_device *dev)
2279 {
2280         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2281         if (!dev->tstats)
2282                 return -ENOMEM;
2283 
2284         return 0;
2285 }
2286 
2287 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2288 {
2289         struct vxlan_fdb *f;
2290 
2291         spin_lock_bh(&vxlan->hash_lock);
2292         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2293         if (f)
2294                 vxlan_fdb_destroy(vxlan, f);
2295         spin_unlock_bh(&vxlan->hash_lock);
2296 }
2297 
2298 static void vxlan_uninit(struct net_device *dev)
2299 {
2300         struct vxlan_dev *vxlan = netdev_priv(dev);
2301 
2302         vxlan_fdb_delete_default(vxlan);
2303 
2304         free_percpu(dev->tstats);
2305 }
2306 
2307 /* Start ageing timer and join group when device is brought up */
2308 static int vxlan_open(struct net_device *dev)
2309 {
2310         struct vxlan_dev *vxlan = netdev_priv(dev);
2311         int ret;
2312 
2313         ret = vxlan_sock_add(vxlan);
2314         if (ret < 0)
2315                 return ret;
2316 
2317         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2318                 ret = vxlan_igmp_join(vxlan);
2319                 if (ret == -EADDRINUSE)
2320                         ret = 0;
2321                 if (ret) {
2322                         vxlan_sock_release(vxlan);
2323                         return ret;
2324                 }
2325         }
2326 
2327         if (vxlan->cfg.age_interval)
2328                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2329 
2330         return ret;
2331 }
2332 
2333 /* Purge the forwarding table */
2334 static void vxlan_flush(struct vxlan_dev *vxlan)
2335 {
2336         unsigned int h;
2337 
2338         spin_lock_bh(&vxlan->hash_lock);
2339         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2340                 struct hlist_node *p, *n;
2341                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2342                         struct vxlan_fdb *f
2343                                 = container_of(p, struct vxlan_fdb, hlist);
2344                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2345                         if (!is_zero_ether_addr(f->eth_addr))
2346                                 vxlan_fdb_destroy(vxlan, f);
2347                 }
2348         }
2349         spin_unlock_bh(&vxlan->hash_lock);
2350 }
2351 
2352 /* Cleanup timer and forwarding table on shutdown */
2353 static int vxlan_stop(struct net_device *dev)
2354 {
2355         struct vxlan_dev *vxlan = netdev_priv(dev);
2356         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2357         int ret = 0;
2358 
2359         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2360             !vxlan_group_used(vn, vxlan))
2361                 ret = vxlan_igmp_leave(vxlan);
2362 
2363         del_timer_sync(&vxlan->age_timer);
2364 
2365         vxlan_flush(vxlan);
2366         vxlan_sock_release(vxlan);
2367 
2368         return ret;
2369 }
2370 
2371 /* Stub, nothing needs to be done. */
2372 static void vxlan_set_multicast_list(struct net_device *dev)
2373 {
2374 }
2375 
2376 static int __vxlan_change_mtu(struct net_device *dev,
2377                               struct net_device *lowerdev,
2378                               struct vxlan_rdst *dst, int new_mtu, bool strict)
2379 {
2380         int max_mtu = IP_MAX_MTU;
2381 
2382         if (lowerdev)
2383                 max_mtu = lowerdev->mtu;
2384 
2385         if (dst->remote_ip.sa.sa_family == AF_INET6)
2386                 max_mtu -= VXLAN6_HEADROOM;
2387         else
2388                 max_mtu -= VXLAN_HEADROOM;
2389 
2390         if (new_mtu < 68)
2391                 return -EINVAL;
2392 
2393         if (new_mtu > max_mtu) {
2394                 if (strict)
2395                         return -EINVAL;
2396 
2397                 new_mtu = max_mtu;
2398         }
2399 
2400         dev->mtu = new_mtu;
2401         return 0;
2402 }
2403 
2404 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2405 {
2406         struct vxlan_dev *vxlan = netdev_priv(dev);
2407         struct vxlan_rdst *dst = &vxlan->default_dst;
2408         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2409                                                          dst->remote_ifindex);
2410         return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2411 }
2412 
2413 static int egress_ipv4_tun_info(struct net_device *dev, struct sk_buff *skb,
2414                                 struct ip_tunnel_info *info,
2415                                 __be16 sport, __be16 dport)
2416 {
2417         struct vxlan_dev *vxlan = netdev_priv(dev);
2418         struct rtable *rt;
2419         struct flowi4 fl4;
2420 
2421         memset(&fl4, 0, sizeof(fl4));
2422         fl4.flowi4_tos = RT_TOS(info->key.tos);
2423         fl4.flowi4_mark = skb->mark;
2424         fl4.flowi4_proto = IPPROTO_UDP;
2425         fl4.daddr = info->key.u.ipv4.dst;
2426 
2427         rt = ip_route_output_key(vxlan->net, &fl4);
2428         if (IS_ERR(rt))
2429                 return PTR_ERR(rt);
2430         ip_rt_put(rt);
2431 
2432         info->key.u.ipv4.src = fl4.saddr;
2433         info->key.tp_src = sport;
2434         info->key.tp_dst = dport;
2435         return 0;
2436 }
2437 
2438 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2439 {
2440         struct vxlan_dev *vxlan = netdev_priv(dev);
2441         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2442         __be16 sport, dport;
2443 
2444         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2445                                   vxlan->cfg.port_max, true);
2446         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2447 
2448         if (ip_tunnel_info_af(info) == AF_INET) {
2449                 if (!vxlan->vn4_sock)
2450                         return -EINVAL;
2451                 return egress_ipv4_tun_info(dev, skb, info, sport, dport);
2452         } else {
2453 #if IS_ENABLED(CONFIG_IPV6)
2454                 struct dst_entry *ndst;
2455 
2456                 if (!vxlan->vn6_sock)
2457                         return -EINVAL;
2458                 ndst = vxlan6_get_route(vxlan, skb, 0,
2459                                         &info->key.u.ipv6.dst,
2460                                         &info->key.u.ipv6.src);
2461                 if (IS_ERR(ndst))
2462                         return PTR_ERR(ndst);
2463                 dst_release(ndst);
2464 
2465                 info->key.tp_src = sport;
2466                 info->key.tp_dst = dport;
2467 #else /* !CONFIG_IPV6 */
2468                 return -EPFNOSUPPORT;
2469 #endif
2470         }
2471         return 0;
2472 }
2473 
2474 static const struct net_device_ops vxlan_netdev_ops = {
2475         .ndo_init               = vxlan_init,
2476         .ndo_uninit             = vxlan_uninit,
2477         .ndo_open               = vxlan_open,
2478         .ndo_stop               = vxlan_stop,
2479         .ndo_start_xmit         = vxlan_xmit,
2480         .ndo_get_stats64        = ip_tunnel_get_stats64,
2481         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2482         .ndo_change_mtu         = vxlan_change_mtu,
2483         .ndo_validate_addr      = eth_validate_addr,
2484         .ndo_set_mac_address    = eth_mac_addr,
2485         .ndo_fdb_add            = vxlan_fdb_add,
2486         .ndo_fdb_del            = vxlan_fdb_delete,
2487         .ndo_fdb_dump           = vxlan_fdb_dump,
2488         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2489 };
2490 
2491 /* Info for udev, that this is a virtual tunnel endpoint */
2492 static struct device_type vxlan_type = {
2493         .name = "vxlan",
2494 };
2495 
2496 /* Calls the ndo_add_vxlan_port of the caller in order to
2497  * supply the listening VXLAN udp ports. Callers are expected
2498  * to implement the ndo_add_vxlan_port.
2499  */
2500 void vxlan_get_rx_port(struct net_device *dev)
2501 {
2502         struct vxlan_sock *vs;
2503         struct net *net = dev_net(dev);
2504         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2505         sa_family_t sa_family;
2506         __be16 port;
2507         unsigned int i;
2508 
2509         spin_lock(&vn->sock_lock);
2510         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2511                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2512                         port = inet_sk(vs->sock->sk)->inet_sport;
2513                         sa_family = vxlan_get_sk_family(vs);
2514                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2515                                                             port);
2516                 }
2517         }
2518         spin_unlock(&vn->sock_lock);
2519 }
2520 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2521 
2522 /* Initialize the device structure. */
2523 static void vxlan_setup(struct net_device *dev)
2524 {
2525         struct vxlan_dev *vxlan = netdev_priv(dev);
2526         unsigned int h;
2527 
2528         eth_hw_addr_random(dev);
2529         ether_setup(dev);
2530 
2531         dev->netdev_ops = &vxlan_netdev_ops;
2532         dev->destructor = free_netdev;
2533         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2534 
2535         dev->features   |= NETIF_F_LLTX;
2536         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2537         dev->features   |= NETIF_F_RXCSUM;
2538         dev->features   |= NETIF_F_GSO_SOFTWARE;
2539 
2540         dev->vlan_features = dev->features;
2541         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2542         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2543         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2544         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2545         netif_keep_dst(dev);
2546         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2547         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2548 
2549         INIT_LIST_HEAD(&vxlan->next);
2550         spin_lock_init(&vxlan->hash_lock);
2551 
2552         init_timer_deferrable(&vxlan->age_timer);
2553         vxlan->age_timer.function = vxlan_cleanup;
2554         vxlan->age_timer.data = (unsigned long) vxlan;
2555 
2556         vxlan->cfg.dst_port = htons(vxlan_port);
2557 
2558         vxlan->dev = dev;
2559 
2560         gro_cells_init(&vxlan->gro_cells, dev);
2561 
2562         for (h = 0; h < FDB_HASH_SIZE; ++h)
2563                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2564 }
2565 
2566 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2567         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2568         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2569         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2570         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2571         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2572         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2573         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2574         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2575         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2576         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2577         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2578         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2579         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2580         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2581         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2582         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2583         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2584         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2585         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2586         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2587         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2588         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2589         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2590         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2591         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2592 };
2593 
2594 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2595 {
2596         if (tb[IFLA_ADDRESS]) {
2597                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2598                         pr_debug("invalid link address (not ethernet)\n");
2599                         return -EINVAL;
2600                 }
2601 
2602                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2603                         pr_debug("invalid all zero ethernet address\n");
2604                         return -EADDRNOTAVAIL;
2605                 }
2606         }
2607 
2608         if (!data)
2609                 return -EINVAL;
2610 
2611         if (data[IFLA_VXLAN_ID]) {
2612                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2613                 if (id >= VXLAN_VID_MASK)
2614                         return -ERANGE;
2615         }
2616 
2617         if (data[IFLA_VXLAN_PORT_RANGE]) {
2618                 const struct ifla_vxlan_port_range *p
2619                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2620 
2621                 if (ntohs(p->high) < ntohs(p->low)) {
2622                         pr_debug("port range %u .. %u not valid\n",
2623                                  ntohs(p->low), ntohs(p->high));
2624                         return -EINVAL;
2625                 }
2626         }
2627 
2628         return 0;
2629 }
2630 
2631 static void vxlan_get_drvinfo(struct net_device *netdev,
2632                               struct ethtool_drvinfo *drvinfo)
2633 {
2634         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2635         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2636 }
2637 
2638 static const struct ethtool_ops vxlan_ethtool_ops = {
2639         .get_drvinfo    = vxlan_get_drvinfo,
2640         .get_link       = ethtool_op_get_link,
2641 };
2642 
2643 static void vxlan_del_work(struct work_struct *work)
2644 {
2645         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2646         udp_tunnel_sock_release(vs->sock);
2647         kfree_rcu(vs, rcu);
2648 }
2649 
2650 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2651                                         __be16 port, u32 flags)
2652 {
2653         struct socket *sock;
2654         struct udp_port_cfg udp_conf;
2655         int err;
2656 
2657         memset(&udp_conf, 0, sizeof(udp_conf));
2658 
2659         if (ipv6) {
2660                 udp_conf.family = AF_INET6;
2661                 udp_conf.use_udp6_rx_checksums =
2662                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2663                 udp_conf.ipv6_v6only = 1;
2664         } else {
2665                 udp_conf.family = AF_INET;
2666         }
2667 
2668         udp_conf.local_udp_port = port;
2669 
2670         /* Open UDP socket */
2671         err = udp_sock_create(net, &udp_conf, &sock);
2672         if (err < 0)
2673                 return ERR_PTR(err);
2674 
2675         return sock;
2676 }
2677 
2678 /* Create new listen socket if needed */
2679 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2680                                               __be16 port, u32 flags)
2681 {
2682         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2683         struct vxlan_sock *vs;
2684         struct socket *sock;
2685         unsigned int h;
2686         struct udp_tunnel_sock_cfg tunnel_cfg;
2687 
2688         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2689         if (!vs)
2690                 return ERR_PTR(-ENOMEM);
2691 
2692         for (h = 0; h < VNI_HASH_SIZE; ++h)
2693                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2694 
2695         INIT_WORK(&vs->del_work, vxlan_del_work);
2696 
2697         sock = vxlan_create_sock(net, ipv6, port, flags);
2698         if (IS_ERR(sock)) {
2699                 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2700                         PTR_ERR(sock));
2701                 kfree(vs);
2702                 return ERR_CAST(sock);
2703         }
2704 
2705         vs->sock = sock;
2706         atomic_set(&vs->refcnt, 1);
2707         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2708 
2709         /* Initialize the vxlan udp offloads structure */
2710         vs->udp_offloads.port = port;
2711         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2712         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2713 
2714         spin_lock(&vn->sock_lock);
2715         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2716         vxlan_notify_add_rx_port(vs);
2717         spin_unlock(&vn->sock_lock);
2718 
2719         /* Mark socket as an encapsulation socket. */
2720         tunnel_cfg.sk_user_data = vs;
2721         tunnel_cfg.encap_type = 1;
2722         tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2723         tunnel_cfg.encap_destroy = NULL;
2724 
2725         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2726 
2727         return vs;
2728 }
2729 
2730 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2731 {
2732         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2733         struct vxlan_sock *vs = NULL;
2734 
2735         if (!vxlan->cfg.no_share) {
2736                 spin_lock(&vn->sock_lock);
2737                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2738                                      vxlan->cfg.dst_port, vxlan->flags);
2739                 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2740                         spin_unlock(&vn->sock_lock);
2741                         return -EBUSY;
2742                 }
2743                 spin_unlock(&vn->sock_lock);
2744         }
2745         if (!vs)
2746                 vs = vxlan_socket_create(vxlan->net, ipv6,
2747                                          vxlan->cfg.dst_port, vxlan->flags);
2748         if (IS_ERR(vs))
2749                 return PTR_ERR(vs);
2750 #if IS_ENABLED(CONFIG_IPV6)
2751         if (ipv6)
2752                 vxlan->vn6_sock = vs;
2753         else
2754 #endif
2755                 vxlan->vn4_sock = vs;
2756         vxlan_vs_add_dev(vs, vxlan);
2757         return 0;
2758 }
2759 
2760 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2761 {
2762         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2763         bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2764         int ret = 0;
2765 
2766         vxlan->vn4_sock = NULL;
2767 #if IS_ENABLED(CONFIG_IPV6)
2768         vxlan->vn6_sock = NULL;
2769         if (ipv6 || metadata)
2770                 ret = __vxlan_sock_add(vxlan, true);
2771 #endif
2772         if (!ret && (!ipv6 || metadata))
2773                 ret = __vxlan_sock_add(vxlan, false);
2774         if (ret < 0)
2775                 vxlan_sock_release(vxlan);
2776         return ret;
2777 }
2778 
2779 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2780                                struct vxlan_config *conf)
2781 {
2782         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2783         struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2784         struct vxlan_rdst *dst = &vxlan->default_dst;
2785         unsigned short needed_headroom = ETH_HLEN;
2786         int err;
2787         bool use_ipv6 = false;
2788         __be16 default_port = vxlan->cfg.dst_port;
2789         struct net_device *lowerdev = NULL;
2790 
2791         vxlan->net = src_net;
2792 
2793         dst->remote_vni = conf->vni;
2794 
2795         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2796 
2797         /* Unless IPv6 is explicitly requested, assume IPv4 */
2798         if (!dst->remote_ip.sa.sa_family)
2799                 dst->remote_ip.sa.sa_family = AF_INET;
2800 
2801         if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2802             vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2803                 if (!IS_ENABLED(CONFIG_IPV6))
2804                         return -EPFNOSUPPORT;
2805                 use_ipv6 = true;
2806                 vxlan->flags |= VXLAN_F_IPV6;
2807         }
2808 
2809         if (conf->remote_ifindex) {
2810                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2811                 dst->remote_ifindex = conf->remote_ifindex;
2812 
2813                 if (!lowerdev) {
2814                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2815                         return -ENODEV;
2816                 }
2817 
2818 #if IS_ENABLED(CONFIG_IPV6)
2819                 if (use_ipv6) {
2820                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2821                         if (idev && idev->cnf.disable_ipv6) {
2822                                 pr_info("IPv6 is disabled via sysctl\n");
2823                                 return -EPERM;
2824                         }
2825                 }
2826 #endif
2827 
2828                 if (!conf->mtu)
2829                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2830 
2831                 needed_headroom = lowerdev->hard_header_len;
2832         }
2833 
2834         if (conf->mtu) {
2835                 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2836                 if (err)
2837                         return err;
2838         }
2839 
2840         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2841                 needed_headroom += VXLAN6_HEADROOM;
2842         else
2843                 needed_headroom += VXLAN_HEADROOM;
2844         dev->needed_headroom = needed_headroom;
2845 
2846         memcpy(&vxlan->cfg, conf, sizeof(*conf));
2847         if (!vxlan->cfg.dst_port)
2848                 vxlan->cfg.dst_port = default_port;
2849         vxlan->flags |= conf->flags;
2850 
2851         if (!vxlan->cfg.age_interval)
2852                 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2853 
2854         list_for_each_entry(tmp, &vn->vxlan_list, next) {
2855                 if (tmp->cfg.vni == conf->vni &&
2856                     (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2857                      tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2858                     tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2859                     (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2860                     (vxlan->flags & VXLAN_F_RCV_FLAGS))
2861                 return -EEXIST;
2862         }
2863 
2864         dev->ethtool_ops = &vxlan_ethtool_ops;
2865 
2866         /* create an fdb entry for a valid default destination */
2867         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2868                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2869                                        &vxlan->default_dst.remote_ip,
2870                                        NUD_REACHABLE|NUD_PERMANENT,
2871                                        NLM_F_EXCL|NLM_F_CREATE,
2872                                        vxlan->cfg.dst_port,
2873                                        vxlan->default_dst.remote_vni,
2874                                        vxlan->default_dst.remote_ifindex,
2875                                        NTF_SELF);
2876                 if (err)
2877                         return err;
2878         }
2879 
2880         err = register_netdevice(dev);
2881         if (err) {
2882                 vxlan_fdb_delete_default(vxlan);
2883                 return err;
2884         }
2885 
2886         list_add(&vxlan->next, &vn->vxlan_list);
2887 
2888         return 0;
2889 }
2890 
2891 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2892                                     u8 name_assign_type, struct vxlan_config *conf)
2893 {
2894         struct nlattr *tb[IFLA_MAX+1];
2895         struct net_device *dev;
2896         int err;
2897 
2898         memset(&tb, 0, sizeof(tb));
2899 
2900         dev = rtnl_create_link(net, name, name_assign_type,
2901                                &vxlan_link_ops, tb);
2902         if (IS_ERR(dev))
2903                 return dev;
2904 
2905         err = vxlan_dev_configure(net, dev, conf);
2906         if (err < 0) {
2907                 free_netdev(dev);
2908                 return ERR_PTR(err);
2909         }
2910 
2911         return dev;
2912 }
2913 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2914 
2915 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2916                          struct nlattr *tb[], struct nlattr *data[])
2917 {
2918         struct vxlan_config conf;
2919         int err;
2920 
2921         memset(&conf, 0, sizeof(conf));
2922 
2923         if (data[IFLA_VXLAN_ID])
2924                 conf.vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2925 
2926         if (data[IFLA_VXLAN_GROUP]) {
2927                 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2928         } else if (data[IFLA_VXLAN_GROUP6]) {
2929                 if (!IS_ENABLED(CONFIG_IPV6))
2930                         return -EPFNOSUPPORT;
2931 
2932                 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2933                 conf.remote_ip.sa.sa_family = AF_INET6;
2934         }
2935 
2936         if (data[IFLA_VXLAN_LOCAL]) {
2937                 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2938                 conf.saddr.sa.sa_family = AF_INET;
2939         } else if (data[IFLA_VXLAN_LOCAL6]) {
2940                 if (!IS_ENABLED(CONFIG_IPV6))
2941                         return -EPFNOSUPPORT;
2942 
2943                 /* TODO: respect scope id */
2944                 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2945                 conf.saddr.sa.sa_family = AF_INET6;
2946         }
2947 
2948         if (data[IFLA_VXLAN_LINK])
2949                 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2950 
2951         if (data[IFLA_VXLAN_TOS])
2952                 conf.tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2953 
2954         if (data[IFLA_VXLAN_TTL])
2955                 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2956 
2957         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2958                 conf.flags |= VXLAN_F_LEARN;
2959 
2960         if (data[IFLA_VXLAN_AGEING])
2961                 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2962 
2963         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2964                 conf.flags |= VXLAN_F_PROXY;
2965 
2966         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2967                 conf.flags |= VXLAN_F_RSC;
2968 
2969         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2970                 conf.flags |= VXLAN_F_L2MISS;
2971 
2972         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2973                 conf.flags |= VXLAN_F_L3MISS;
2974 
2975         if (data[IFLA_VXLAN_LIMIT])
2976                 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2977 
2978         if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2979             nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2980                 conf.flags |= VXLAN_F_COLLECT_METADATA;
2981 
2982         if (data[IFLA_VXLAN_PORT_RANGE]) {
2983                 const struct ifla_vxlan_port_range *p
2984                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2985                 conf.port_min = ntohs(p->low);
2986                 conf.port_max = ntohs(p->high);
2987         }
2988 
2989         if (data[IFLA_VXLAN_PORT])
2990                 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2991 
2992         if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2993                 conf.flags |= VXLAN_F_UDP_CSUM;
2994 
2995         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2996             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2997                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2998 
2999         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3000             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3001                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3002 
3003         if (data[IFLA_VXLAN_REMCSUM_TX] &&
3004             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3005                 conf.flags |= VXLAN_F_REMCSUM_TX;
3006 
3007         if (data[IFLA_VXLAN_REMCSUM_RX] &&
3008             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3009                 conf.flags |= VXLAN_F_REMCSUM_RX;
3010 
3011         if (data[IFLA_VXLAN_GBP])
3012                 conf.flags |= VXLAN_F_GBP;
3013 
3014         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3015                 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3016 
3017         err = vxlan_dev_configure(src_net, dev, &conf);
3018         switch (err) {
3019         case -ENODEV:
3020                 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
3021                 break;
3022 
3023         case -EPERM:
3024                 pr_info("IPv6 is disabled via sysctl\n");
3025                 break;
3026 
3027         case -EEXIST:
3028                 pr_info("duplicate VNI %u\n", conf.vni);
3029                 break;
3030         }
3031 
3032         return err;
3033 }
3034 
3035 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3036 {
3037         struct vxlan_dev *vxlan = netdev_priv(dev);
3038         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3039 
3040         spin_lock(&vn->sock_lock);
3041         if (!hlist_unhashed(&vxlan->hlist))
3042                 hlist_del_rcu(&vxlan->hlist);
3043         spin_unlock(&vn->sock_lock);
3044 
3045         gro_cells_destroy(&vxlan->gro_cells);
3046         list_del(&vxlan->next);
3047         unregister_netdevice_queue(dev, head);
3048 }
3049 
3050 static size_t vxlan_get_size(const struct net_device *dev)
3051 {
3052 
3053         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
3054                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3055                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3056                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3057                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3058                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3059                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3060                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3061                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3062                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3063                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3064                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3065                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3066                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3067                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3068                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3069                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3070                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3071                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3072                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3073                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3074                 0;
3075 }
3076 
3077 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3078 {
3079         const struct vxlan_dev *vxlan = netdev_priv(dev);
3080         const struct vxlan_rdst *dst = &vxlan->default_dst;
3081         struct ifla_vxlan_port_range ports = {
3082                 .low =  htons(vxlan->cfg.port_min),
3083                 .high = htons(vxlan->cfg.port_max),
3084         };
3085 
3086         if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
3087                 goto nla_put_failure;
3088 
3089         if (!vxlan_addr_any(&dst->remote_ip)) {
3090                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3091                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3092                                             dst->remote_ip.sin.sin_addr.s_addr))
3093                                 goto nla_put_failure;
3094 #if IS_ENABLED(CONFIG_IPV6)
3095                 } else {
3096                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3097                                              &dst->remote_ip.sin6.sin6_addr))
3098                                 goto nla_put_failure;
3099 #endif
3100                 }
3101         }
3102 
3103         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3104                 goto nla_put_failure;
3105 
3106         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3107                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3108                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3109                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3110                                 goto nla_put_failure;
3111 #if IS_ENABLED(CONFIG_IPV6)
3112                 } else {
3113                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3114                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3115                                 goto nla_put_failure;
3116 #endif
3117                 }
3118         }
3119 
3120         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3121             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3122             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3123                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
3124             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3125                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
3126             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3127             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3128                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3129             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3130                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3131             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3132                        !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3133             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3134             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3135             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3136             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3137                         !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
3138             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3139                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3140             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3141                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3142             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3143                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3144             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3145                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3146                 goto nla_put_failure;
3147 
3148         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3149                 goto nla_put_failure;
3150 
3151         if (vxlan->flags & VXLAN_F_GBP &&
3152             nla_put_flag(skb, IFLA_VXLAN_GBP))
3153                 goto nla_put_failure;
3154 
3155         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3156             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3157                 goto nla_put_failure;
3158 
3159         return 0;
3160 
3161 nla_put_failure:
3162         return -EMSGSIZE;
3163 }
3164 
3165 static struct net *vxlan_get_link_net(const struct net_device *dev)
3166 {
3167         struct vxlan_dev *vxlan = netdev_priv(dev);
3168 
3169         return vxlan->net;
3170 }
3171 
3172 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3173         .kind           = "vxlan",
3174         .maxtype        = IFLA_VXLAN_MAX,
3175         .policy         = vxlan_policy,
3176         .priv_size      = sizeof(struct vxlan_dev),
3177         .setup          = vxlan_setup,
3178         .validate       = vxlan_validate,
3179         .newlink        = vxlan_newlink,
3180         .dellink        = vxlan_dellink,
3181         .get_size       = vxlan_get_size,
3182         .fill_info      = vxlan_fill_info,
3183         .get_link_net   = vxlan_get_link_net,
3184 };
3185 
3186 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3187                                              struct net_device *dev)
3188 {
3189         struct vxlan_dev *vxlan, *next;
3190         LIST_HEAD(list_kill);
3191 
3192         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3193                 struct vxlan_rdst *dst = &vxlan->default_dst;
3194 
3195                 /* In case we created vxlan device with carrier
3196                  * and we loose the carrier due to module unload
3197                  * we also need to remove vxlan device. In other
3198                  * cases, it's not necessary and remote_ifindex
3199                  * is 0 here, so no matches.
3200                  */
3201                 if (dst->remote_ifindex == dev->ifindex)
3202                         vxlan_dellink(vxlan->dev, &list_kill);
3203         }
3204 
3205         unregister_netdevice_many(&list_kill);
3206 }
3207 
3208 static int vxlan_lowerdev_event(struct notifier_block *unused,
3209                                 unsigned long event, void *ptr)
3210 {
3211         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3212         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3213 
3214         if (event == NETDEV_UNREGISTER)
3215                 vxlan_handle_lowerdev_unregister(vn, dev);
3216 
3217         return NOTIFY_DONE;
3218 }
3219 
3220 static struct notifier_block vxlan_notifier_block __read_mostly = {
3221         .notifier_call = vxlan_lowerdev_event,
3222 };
3223 
3224 static __net_init int vxlan_init_net(struct net *net)
3225 {
3226         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3227         unsigned int h;
3228 
3229         INIT_LIST_HEAD(&vn->vxlan_list);
3230         spin_lock_init(&vn->sock_lock);
3231 
3232         for (h = 0; h < PORT_HASH_SIZE; ++h)
3233                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3234 
3235         return 0;
3236 }
3237 
3238 static void __net_exit vxlan_exit_net(struct net *net)
3239 {
3240         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3241         struct vxlan_dev *vxlan, *next;
3242         struct net_device *dev, *aux;
3243         LIST_HEAD(list);
3244 
3245         rtnl_lock();
3246         for_each_netdev_safe(net, dev, aux)
3247                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3248                         unregister_netdevice_queue(dev, &list);
3249 
3250         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3251                 /* If vxlan->dev is in the same netns, it has already been added
3252                  * to the list by the previous loop.
3253                  */
3254                 if (!net_eq(dev_net(vxlan->dev), net)) {
3255                         gro_cells_destroy(&vxlan->gro_cells);
3256                         unregister_netdevice_queue(vxlan->dev, &list);
3257                 }
3258         }
3259 
3260         unregister_netdevice_many(&list);
3261         rtnl_unlock();
3262 }
3263 
3264 static struct pernet_operations vxlan_net_ops = {
3265         .init = vxlan_init_net,
3266         .exit = vxlan_exit_net,
3267         .id   = &vxlan_net_id,
3268         .size = sizeof(struct vxlan_net),
3269 };
3270 
3271 static int __init vxlan_init_module(void)
3272 {
3273         int rc;
3274 
3275         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3276         if (!vxlan_wq)
3277                 return -ENOMEM;
3278 
3279         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3280 
3281         rc = register_pernet_subsys(&vxlan_net_ops);
3282         if (rc)
3283                 goto out1;
3284 
3285         rc = register_netdevice_notifier(&vxlan_notifier_block);
3286         if (rc)
3287                 goto out2;
3288 
3289         rc = rtnl_link_register(&vxlan_link_ops);
3290         if (rc)
3291                 goto out3;
3292 
3293         return 0;
3294 out3:
3295         unregister_netdevice_notifier(&vxlan_notifier_block);
3296 out2:
3297         unregister_pernet_subsys(&vxlan_net_ops);
3298 out1:
3299         destroy_workqueue(vxlan_wq);
3300         return rc;
3301 }
3302 late_initcall(vxlan_init_module);
3303 
3304 static void __exit vxlan_cleanup_module(void)
3305 {
3306         rtnl_link_unregister(&vxlan_link_ops);
3307         unregister_netdevice_notifier(&vxlan_notifier_block);
3308         destroy_workqueue(vxlan_wq);
3309         unregister_pernet_subsys(&vxlan_net_ops);
3310         /* rcu_barrier() is called by netns */
3311 }
3312 module_exit(vxlan_cleanup_module);
3313 
3314 MODULE_LICENSE("GPL");
3315 MODULE_VERSION(VXLAN_VERSION);
3316 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3317 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3318 MODULE_ALIAS_RTNL_LINK("vxlan");
3319 

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