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

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];
 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(&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                                         goto out;
936 skip:
937                                 ++idx;
938                         }
939                 }
940         }
941 out:
942         return idx;
943 }
944 
945 /* Watch incoming packets to learn mapping between Ethernet address
946  * and Tunnel endpoint.
947  * Return true if packet is bogus and should be dropped.
948  */
949 static bool vxlan_snoop(struct net_device *dev,
950                         union vxlan_addr *src_ip, const u8 *src_mac)
951 {
952         struct vxlan_dev *vxlan = netdev_priv(dev);
953         struct vxlan_fdb *f;
954 
955         f = vxlan_find_mac(vxlan, src_mac);
956         if (likely(f)) {
957                 struct vxlan_rdst *rdst = first_remote_rcu(f);
958 
959                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
960                         return false;
961 
962                 /* Don't migrate static entries, drop packets */
963                 if (f->state & NUD_NOARP)
964                         return true;
965 
966                 if (net_ratelimit())
967                         netdev_info(dev,
968                                     "%pM migrated from %pIS to %pIS\n",
969                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
970 
971                 rdst->remote_ip = *src_ip;
972                 f->updated = jiffies;
973                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
974         } else {
975                 /* learned new entry */
976                 spin_lock(&vxlan->hash_lock);
977 
978                 /* close off race between vxlan_flush and incoming packets */
979                 if (netif_running(dev))
980                         vxlan_fdb_create(vxlan, src_mac, src_ip,
981                                          NUD_REACHABLE,
982                                          NLM_F_EXCL|NLM_F_CREATE,
983                                          vxlan->cfg.dst_port,
984                                          vxlan->default_dst.remote_vni,
985                                          0, NTF_SELF);
986                 spin_unlock(&vxlan->hash_lock);
987         }
988 
989         return false;
990 }
991 
992 /* See if multicast group is already in use by other ID */
993 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
994 {
995         struct vxlan_dev *vxlan;
996         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
997 
998         /* The vxlan_sock is only used by dev, leaving group has
999          * no effect on other vxlan devices.
1000          */
1001         if (family == AF_INET && dev->vn4_sock &&
1002             atomic_read(&dev->vn4_sock->refcnt) == 1)
1003                 return false;
1004 #if IS_ENABLED(CONFIG_IPV6)
1005         if (family == AF_INET6 && dev->vn6_sock &&
1006             atomic_read(&dev->vn6_sock->refcnt) == 1)
1007                 return false;
1008 #endif
1009 
1010         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1011                 if (!netif_running(vxlan->dev) || vxlan == dev)
1012                         continue;
1013 
1014                 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1015                         continue;
1016 #if IS_ENABLED(CONFIG_IPV6)
1017                 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1018                         continue;
1019 #endif
1020 
1021                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1022                                       &dev->default_dst.remote_ip))
1023                         continue;
1024 
1025                 if (vxlan->default_dst.remote_ifindex !=
1026                     dev->default_dst.remote_ifindex)
1027                         continue;
1028 
1029                 return true;
1030         }
1031 
1032         return false;
1033 }
1034 
1035 static void __vxlan_sock_release(struct vxlan_sock *vs)
1036 {
1037         struct vxlan_net *vn;
1038 
1039         if (!vs)
1040                 return;
1041         if (!atomic_dec_and_test(&vs->refcnt))
1042                 return;
1043 
1044         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1045         spin_lock(&vn->sock_lock);
1046         hlist_del_rcu(&vs->hlist);
1047         vxlan_notify_del_rx_port(vs);
1048         spin_unlock(&vn->sock_lock);
1049 
1050         queue_work(vxlan_wq, &vs->del_work);
1051 }
1052 
1053 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1054 {
1055         __vxlan_sock_release(vxlan->vn4_sock);
1056 #if IS_ENABLED(CONFIG_IPV6)
1057         __vxlan_sock_release(vxlan->vn6_sock);
1058 #endif
1059 }
1060 
1061 /* Update multicast group membership when first VNI on
1062  * multicast address is brought up
1063  */
1064 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1065 {
1066         struct sock *sk;
1067         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1068         int ifindex = vxlan->default_dst.remote_ifindex;
1069         int ret = -EINVAL;
1070 
1071         if (ip->sa.sa_family == AF_INET) {
1072                 struct ip_mreqn mreq = {
1073                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1074                         .imr_ifindex            = ifindex,
1075                 };
1076 
1077                 sk = vxlan->vn4_sock->sock->sk;
1078                 lock_sock(sk);
1079                 ret = ip_mc_join_group(sk, &mreq);
1080                 release_sock(sk);
1081 #if IS_ENABLED(CONFIG_IPV6)
1082         } else {
1083                 sk = vxlan->vn6_sock->sock->sk;
1084                 lock_sock(sk);
1085                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1086                                                    &ip->sin6.sin6_addr);
1087                 release_sock(sk);
1088 #endif
1089         }
1090 
1091         return ret;
1092 }
1093 
1094 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1095 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1096 {
1097         struct sock *sk;
1098         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1099         int ifindex = vxlan->default_dst.remote_ifindex;
1100         int ret = -EINVAL;
1101 
1102         if (ip->sa.sa_family == AF_INET) {
1103                 struct ip_mreqn mreq = {
1104                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1105                         .imr_ifindex            = ifindex,
1106                 };
1107 
1108                 sk = vxlan->vn4_sock->sock->sk;
1109                 lock_sock(sk);
1110                 ret = ip_mc_leave_group(sk, &mreq);
1111                 release_sock(sk);
1112 #if IS_ENABLED(CONFIG_IPV6)
1113         } else {
1114                 sk = vxlan->vn6_sock->sock->sk;
1115                 lock_sock(sk);
1116                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1117                                                    &ip->sin6.sin6_addr);
1118                 release_sock(sk);
1119 #endif
1120         }
1121 
1122         return ret;
1123 }
1124 
1125 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1126                                       size_t hdrlen, u32 data, bool nopartial)
1127 {
1128         size_t start, offset, plen;
1129 
1130         if (skb->remcsum_offload)
1131                 return vh;
1132 
1133         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1134         offset = start + ((data & VXLAN_RCO_UDP) ?
1135                           offsetof(struct udphdr, check) :
1136                           offsetof(struct tcphdr, check));
1137 
1138         plen = hdrlen + offset + sizeof(u16);
1139 
1140         if (!pskb_may_pull(skb, plen))
1141                 return NULL;
1142 
1143         vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1144 
1145         skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1146                             nopartial);
1147 
1148         return vh;
1149 }
1150 
1151 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1152                       struct vxlan_metadata *md, u32 vni,
1153                       struct metadata_dst *tun_dst)
1154 {
1155         struct iphdr *oip = NULL;
1156         struct ipv6hdr *oip6 = NULL;
1157         struct vxlan_dev *vxlan;
1158         struct pcpu_sw_netstats *stats;
1159         union vxlan_addr saddr;
1160         int err = 0;
1161 
1162         /* For flow based devices, map all packets to VNI 0 */
1163         if (vs->flags & VXLAN_F_COLLECT_METADATA)
1164                 vni = 0;
1165 
1166         /* Is this VNI defined? */
1167         vxlan = vxlan_vs_find_vni(vs, vni);
1168         if (!vxlan)
1169                 goto drop;
1170 
1171         skb_reset_mac_header(skb);
1172         skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1173         skb->protocol = eth_type_trans(skb, vxlan->dev);
1174         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1175 
1176         /* Ignore packet loops (and multicast echo) */
1177         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1178                 goto drop;
1179 
1180         /* Get data from the outer IP header */
1181         if (vxlan_get_sk_family(vs) == AF_INET) {
1182                 oip = ip_hdr(skb);
1183                 saddr.sin.sin_addr.s_addr = oip->saddr;
1184                 saddr.sa.sa_family = AF_INET;
1185 #if IS_ENABLED(CONFIG_IPV6)
1186         } else {
1187                 oip6 = ipv6_hdr(skb);
1188                 saddr.sin6.sin6_addr = oip6->saddr;
1189                 saddr.sa.sa_family = AF_INET6;
1190 #endif
1191         }
1192 
1193         if (tun_dst) {
1194                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1195                 tun_dst = NULL;
1196         }
1197 
1198         if ((vxlan->flags & VXLAN_F_LEARN) &&
1199             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1200                 goto drop;
1201 
1202         skb_reset_network_header(skb);
1203         /* In flow-based mode, GBP is carried in dst_metadata */
1204         if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1205                 skb->mark = md->gbp;
1206 
1207         if (oip6)
1208                 err = IP6_ECN_decapsulate(oip6, skb);
1209         if (oip)
1210                 err = IP_ECN_decapsulate(oip, skb);
1211 
1212         if (unlikely(err)) {
1213                 if (log_ecn_error) {
1214                         if (oip6)
1215                                 net_info_ratelimited("non-ECT from %pI6\n",
1216                                                      &oip6->saddr);
1217                         if (oip)
1218                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1219                                                      &oip->saddr, oip->tos);
1220                 }
1221                 if (err > 1) {
1222                         ++vxlan->dev->stats.rx_frame_errors;
1223                         ++vxlan->dev->stats.rx_errors;
1224                         goto drop;
1225                 }
1226         }
1227 
1228         stats = this_cpu_ptr(vxlan->dev->tstats);
1229         u64_stats_update_begin(&stats->syncp);
1230         stats->rx_packets++;
1231         stats->rx_bytes += skb->len;
1232         u64_stats_update_end(&stats->syncp);
1233 
1234         gro_cells_receive(&vxlan->gro_cells, skb);
1235 
1236         return;
1237 drop:
1238         if (tun_dst)
1239                 dst_release((struct dst_entry *)tun_dst);
1240 
1241         /* Consume bad packet */
1242         kfree_skb(skb);
1243 }
1244 
1245 /* Callback from net/ipv4/udp.c to receive packets */
1246 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1247 {
1248         struct metadata_dst *tun_dst = NULL;
1249         struct vxlan_sock *vs;
1250         struct vxlanhdr *vxh;
1251         u32 flags, vni;
1252         struct vxlan_metadata _md;
1253         struct vxlan_metadata *md = &_md;
1254 
1255         /* Need Vxlan and inner Ethernet header to be present */
1256         if (!pskb_may_pull(skb, VXLAN_HLEN))
1257                 goto error;
1258 
1259         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1260         flags = ntohl(vxh->vx_flags);
1261         vni = ntohl(vxh->vx_vni);
1262 
1263         if (flags & VXLAN_HF_VNI) {
1264                 flags &= ~VXLAN_HF_VNI;
1265         } else {
1266                 /* VNI flag always required to be set */
1267                 goto bad_flags;
1268         }
1269 
1270         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1271                 goto drop;
1272         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1273 
1274         vs = rcu_dereference_sk_user_data(sk);
1275         if (!vs)
1276                 goto drop;
1277 
1278         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1279                 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1280                                     !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1281                 if (!vxh)
1282                         goto drop;
1283 
1284                 flags &= ~VXLAN_HF_RCO;
1285                 vni &= VXLAN_VNI_MASK;
1286         }
1287 
1288         if (vxlan_collect_metadata(vs)) {
1289                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1290                                          cpu_to_be64(vni >> 8), sizeof(*md));
1291 
1292                 if (!tun_dst)
1293                         goto drop;
1294 
1295                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1296         } else {
1297                 memset(md, 0, sizeof(*md));
1298         }
1299 
1300         /* For backwards compatibility, only allow reserved fields to be
1301          * used by VXLAN extensions if explicitly requested.
1302          */
1303         if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1304                 struct vxlanhdr_gbp *gbp;
1305 
1306                 gbp = (struct vxlanhdr_gbp *)vxh;
1307                 md->gbp = ntohs(gbp->policy_id);
1308 
1309                 if (tun_dst)
1310                         tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1311 
1312                 if (gbp->dont_learn)
1313                         md->gbp |= VXLAN_GBP_DONT_LEARN;
1314 
1315                 if (gbp->policy_applied)
1316                         md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1317 
1318                 flags &= ~VXLAN_GBP_USED_BITS;
1319         }
1320 
1321         if (flags || vni & ~VXLAN_VNI_MASK) {
1322                 /* If there are any unprocessed flags remaining treat
1323                  * this as a malformed packet. This behavior diverges from
1324                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1325                  * in reserved fields are to be ignored. The approach here
1326                  * maintains compatibility with previous stack code, and also
1327                  * is more robust and provides a little more security in
1328                  * adding extensions to VXLAN.
1329                  */
1330 
1331                 goto bad_flags;
1332         }
1333 
1334         vxlan_rcv(vs, skb, md, vni >> 8, tun_dst);
1335         return 0;
1336 
1337 drop:
1338         /* Consume bad packet */
1339         kfree_skb(skb);
1340         return 0;
1341 
1342 bad_flags:
1343         netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1344                    ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1345 
1346 error:
1347         if (tun_dst)
1348                 dst_release((struct dst_entry *)tun_dst);
1349 
1350         /* Return non vxlan pkt */
1351         return 1;
1352 }
1353 
1354 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1355 {
1356         struct vxlan_dev *vxlan = netdev_priv(dev);
1357         struct arphdr *parp;
1358         u8 *arpptr, *sha;
1359         __be32 sip, tip;
1360         struct neighbour *n;
1361 
1362         if (dev->flags & IFF_NOARP)
1363                 goto out;
1364 
1365         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1366                 dev->stats.tx_dropped++;
1367                 goto out;
1368         }
1369         parp = arp_hdr(skb);
1370 
1371         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1372              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1373             parp->ar_pro != htons(ETH_P_IP) ||
1374             parp->ar_op != htons(ARPOP_REQUEST) ||
1375             parp->ar_hln != dev->addr_len ||
1376             parp->ar_pln != 4)
1377                 goto out;
1378         arpptr = (u8 *)parp + sizeof(struct arphdr);
1379         sha = arpptr;
1380         arpptr += dev->addr_len;        /* sha */
1381         memcpy(&sip, arpptr, sizeof(sip));
1382         arpptr += sizeof(sip);
1383         arpptr += dev->addr_len;        /* tha */
1384         memcpy(&tip, arpptr, sizeof(tip));
1385 
1386         if (ipv4_is_loopback(tip) ||
1387             ipv4_is_multicast(tip))
1388                 goto out;
1389 
1390         n = neigh_lookup(&arp_tbl, &tip, dev);
1391 
1392         if (n) {
1393                 struct vxlan_fdb *f;
1394                 struct sk_buff  *reply;
1395 
1396                 if (!(n->nud_state & NUD_CONNECTED)) {
1397                         neigh_release(n);
1398                         goto out;
1399                 }
1400 
1401                 f = vxlan_find_mac(vxlan, n->ha);
1402                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1403                         /* bridge-local neighbor */
1404                         neigh_release(n);
1405                         goto out;
1406                 }
1407 
1408                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1409                                 n->ha, sha);
1410 
1411                 neigh_release(n);
1412 
1413                 if (reply == NULL)
1414                         goto out;
1415 
1416                 skb_reset_mac_header(reply);
1417                 __skb_pull(reply, skb_network_offset(reply));
1418                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1419                 reply->pkt_type = PACKET_HOST;
1420 
1421                 if (netif_rx_ni(reply) == NET_RX_DROP)
1422                         dev->stats.rx_dropped++;
1423         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1424                 union vxlan_addr ipa = {
1425                         .sin.sin_addr.s_addr = tip,
1426                         .sin.sin_family = AF_INET,
1427                 };
1428 
1429                 vxlan_ip_miss(dev, &ipa);
1430         }
1431 out:
1432         consume_skb(skb);
1433         return NETDEV_TX_OK;
1434 }
1435 
1436 #if IS_ENABLED(CONFIG_IPV6)
1437 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1438         struct neighbour *n, bool isrouter)
1439 {
1440         struct net_device *dev = request->dev;
1441         struct sk_buff *reply;
1442         struct nd_msg *ns, *na;
1443         struct ipv6hdr *pip6;
1444         u8 *daddr;
1445         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1446         int ns_olen;
1447         int i, len;
1448 
1449         if (dev == NULL)
1450                 return NULL;
1451 
1452         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1453                 sizeof(*na) + na_olen + dev->needed_tailroom;
1454         reply = alloc_skb(len, GFP_ATOMIC);
1455         if (reply == NULL)
1456                 return NULL;
1457 
1458         reply->protocol = htons(ETH_P_IPV6);
1459         reply->dev = dev;
1460         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1461         skb_push(reply, sizeof(struct ethhdr));
1462         skb_set_mac_header(reply, 0);
1463 
1464         ns = (struct nd_msg *)skb_transport_header(request);
1465 
1466         daddr = eth_hdr(request)->h_source;
1467         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1468         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1469                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1470                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1471                         break;
1472                 }
1473         }
1474 
1475         /* Ethernet header */
1476         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1477         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1478         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1479         reply->protocol = htons(ETH_P_IPV6);
1480 
1481         skb_pull(reply, sizeof(struct ethhdr));
1482         skb_set_network_header(reply, 0);
1483         skb_put(reply, sizeof(struct ipv6hdr));
1484 
1485         /* IPv6 header */
1486 
1487         pip6 = ipv6_hdr(reply);
1488         memset(pip6, 0, sizeof(struct ipv6hdr));
1489         pip6->version = 6;
1490         pip6->priority = ipv6_hdr(request)->priority;
1491         pip6->nexthdr = IPPROTO_ICMPV6;
1492         pip6->hop_limit = 255;
1493         pip6->daddr = ipv6_hdr(request)->saddr;
1494         pip6->saddr = *(struct in6_addr *)n->primary_key;
1495 
1496         skb_pull(reply, sizeof(struct ipv6hdr));
1497         skb_set_transport_header(reply, 0);
1498 
1499         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1500 
1501         /* Neighbor Advertisement */
1502         memset(na, 0, sizeof(*na)+na_olen);
1503         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1504         na->icmph.icmp6_router = isrouter;
1505         na->icmph.icmp6_override = 1;
1506         na->icmph.icmp6_solicited = 1;
1507         na->target = ns->target;
1508         ether_addr_copy(&na->opt[2], n->ha);
1509         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1510         na->opt[1] = na_olen >> 3;
1511 
1512         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1513                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1514                 csum_partial(na, sizeof(*na)+na_olen, 0));
1515 
1516         pip6->payload_len = htons(sizeof(*na)+na_olen);
1517 
1518         skb_push(reply, sizeof(struct ipv6hdr));
1519 
1520         reply->ip_summed = CHECKSUM_UNNECESSARY;
1521 
1522         return reply;
1523 }
1524 
1525 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1526 {
1527         struct vxlan_dev *vxlan = netdev_priv(dev);
1528         struct nd_msg *msg;
1529         const struct ipv6hdr *iphdr;
1530         const struct in6_addr *saddr, *daddr;
1531         struct neighbour *n;
1532         struct inet6_dev *in6_dev;
1533 
1534         in6_dev = __in6_dev_get(dev);
1535         if (!in6_dev)
1536                 goto out;
1537 
1538         iphdr = ipv6_hdr(skb);
1539         saddr = &iphdr->saddr;
1540         daddr = &iphdr->daddr;
1541 
1542         msg = (struct nd_msg *)skb_transport_header(skb);
1543         if (msg->icmph.icmp6_code != 0 ||
1544             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1545                 goto out;
1546 
1547         if (ipv6_addr_loopback(daddr) ||
1548             ipv6_addr_is_multicast(&msg->target))
1549                 goto out;
1550 
1551         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1552 
1553         if (n) {
1554                 struct vxlan_fdb *f;
1555                 struct sk_buff *reply;
1556 
1557                 if (!(n->nud_state & NUD_CONNECTED)) {
1558                         neigh_release(n);
1559                         goto out;
1560                 }
1561 
1562                 f = vxlan_find_mac(vxlan, n->ha);
1563                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1564                         /* bridge-local neighbor */
1565                         neigh_release(n);
1566                         goto out;
1567                 }
1568 
1569                 reply = vxlan_na_create(skb, n,
1570                                         !!(f ? f->flags & NTF_ROUTER : 0));
1571 
1572                 neigh_release(n);
1573 
1574                 if (reply == NULL)
1575                         goto out;
1576 
1577                 if (netif_rx_ni(reply) == NET_RX_DROP)
1578                         dev->stats.rx_dropped++;
1579 
1580         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1581                 union vxlan_addr ipa = {
1582                         .sin6.sin6_addr = msg->target,
1583                         .sin6.sin6_family = AF_INET6,
1584                 };
1585 
1586                 vxlan_ip_miss(dev, &ipa);
1587         }
1588 
1589 out:
1590         consume_skb(skb);
1591         return NETDEV_TX_OK;
1592 }
1593 #endif
1594 
1595 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1596 {
1597         struct vxlan_dev *vxlan = netdev_priv(dev);
1598         struct neighbour *n;
1599 
1600         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1601                 return false;
1602 
1603         n = NULL;
1604         switch (ntohs(eth_hdr(skb)->h_proto)) {
1605         case ETH_P_IP:
1606         {
1607                 struct iphdr *pip;
1608 
1609                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1610                         return false;
1611                 pip = ip_hdr(skb);
1612                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1613                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1614                         union vxlan_addr ipa = {
1615                                 .sin.sin_addr.s_addr = pip->daddr,
1616                                 .sin.sin_family = AF_INET,
1617                         };
1618 
1619                         vxlan_ip_miss(dev, &ipa);
1620                         return false;
1621                 }
1622 
1623                 break;
1624         }
1625 #if IS_ENABLED(CONFIG_IPV6)
1626         case ETH_P_IPV6:
1627         {
1628                 struct ipv6hdr *pip6;
1629 
1630                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1631                         return false;
1632                 pip6 = ipv6_hdr(skb);
1633                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1634                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1635                         union vxlan_addr ipa = {
1636                                 .sin6.sin6_addr = pip6->daddr,
1637                                 .sin6.sin6_family = AF_INET6,
1638                         };
1639 
1640                         vxlan_ip_miss(dev, &ipa);
1641                         return false;
1642                 }
1643 
1644                 break;
1645         }
1646 #endif
1647         default:
1648                 return false;
1649         }
1650 
1651         if (n) {
1652                 bool diff;
1653 
1654                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1655                 if (diff) {
1656                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1657                                 dev->addr_len);
1658                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1659                 }
1660                 neigh_release(n);
1661                 return diff;
1662         }
1663 
1664         return false;
1665 }
1666 
1667 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1668                                 struct vxlan_metadata *md)
1669 {
1670         struct vxlanhdr_gbp *gbp;
1671 
1672         if (!md->gbp)
1673                 return;
1674 
1675         gbp = (struct vxlanhdr_gbp *)vxh;
1676         vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1677 
1678         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1679                 gbp->dont_learn = 1;
1680 
1681         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1682                 gbp->policy_applied = 1;
1683 
1684         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1685 }
1686 
1687 #if IS_ENABLED(CONFIG_IPV6)
1688 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1689                            struct sk_buff *skb,
1690                            struct net_device *dev, struct in6_addr *saddr,
1691                            struct in6_addr *daddr, __u8 prio, __u8 ttl,
1692                            __be16 src_port, __be16 dst_port, __be32 vni,
1693                            struct vxlan_metadata *md, bool xnet, u32 vxflags)
1694 {
1695         struct vxlanhdr *vxh;
1696         int min_headroom;
1697         int err;
1698         bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1699         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1700         u16 hdrlen = sizeof(struct vxlanhdr);
1701 
1702         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1703             skb->ip_summed == CHECKSUM_PARTIAL) {
1704                 int csum_start = skb_checksum_start_offset(skb);
1705 
1706                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1707                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1708                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1709                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1710                         udp_sum = false;
1711                         type |= SKB_GSO_TUNNEL_REMCSUM;
1712                 }
1713         }
1714 
1715         skb_scrub_packet(skb, xnet);
1716 
1717         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1718                         + VXLAN_HLEN + sizeof(struct ipv6hdr)
1719                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1720 
1721         /* Need space for new headers (invalidates iph ptr) */
1722         err = skb_cow_head(skb, min_headroom);
1723         if (unlikely(err)) {
1724                 kfree_skb(skb);
1725                 goto err;
1726         }
1727 
1728         skb = vlan_hwaccel_push_inside(skb);
1729         if (WARN_ON(!skb)) {
1730                 err = -ENOMEM;
1731                 goto err;
1732         }
1733 
1734         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1735         if (IS_ERR(skb)) {
1736                 err = -EINVAL;
1737                 goto err;
1738         }
1739 
1740         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1741         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1742         vxh->vx_vni = vni;
1743 
1744         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1745                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1746                            VXLAN_RCO_SHIFT;
1747 
1748                 if (skb->csum_offset == offsetof(struct udphdr, check))
1749                         data |= VXLAN_RCO_UDP;
1750 
1751                 vxh->vx_vni |= htonl(data);
1752                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1753 
1754                 if (!skb_is_gso(skb)) {
1755                         skb->ip_summed = CHECKSUM_NONE;
1756                         skb->encapsulation = 0;
1757                 }
1758         }
1759 
1760         if (vxflags & VXLAN_F_GBP)
1761                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1762 
1763         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1764 
1765         udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1766                              ttl, src_port, dst_port,
1767                              !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1768         return 0;
1769 err:
1770         dst_release(dst);
1771         return err;
1772 }
1773 #endif
1774 
1775 static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
1776                           __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1777                           __be16 src_port, __be16 dst_port, __be32 vni,
1778                           struct vxlan_metadata *md, bool xnet, u32 vxflags)
1779 {
1780         struct vxlanhdr *vxh;
1781         int min_headroom;
1782         int err;
1783         bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1784         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1785         u16 hdrlen = sizeof(struct vxlanhdr);
1786 
1787         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1788             skb->ip_summed == CHECKSUM_PARTIAL) {
1789                 int csum_start = skb_checksum_start_offset(skb);
1790 
1791                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1792                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1793                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1794                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1795                         udp_sum = false;
1796                         type |= SKB_GSO_TUNNEL_REMCSUM;
1797                 }
1798         }
1799 
1800         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1801                         + VXLAN_HLEN + sizeof(struct iphdr)
1802                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1803 
1804         /* Need space for new headers (invalidates iph ptr) */
1805         err = skb_cow_head(skb, min_headroom);
1806         if (unlikely(err)) {
1807                 kfree_skb(skb);
1808                 return err;
1809         }
1810 
1811         skb = vlan_hwaccel_push_inside(skb);
1812         if (WARN_ON(!skb))
1813                 return -ENOMEM;
1814 
1815         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1816         if (IS_ERR(skb))
1817                 return PTR_ERR(skb);
1818 
1819         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1820         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1821         vxh->vx_vni = vni;
1822 
1823         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1824                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1825                            VXLAN_RCO_SHIFT;
1826 
1827                 if (skb->csum_offset == offsetof(struct udphdr, check))
1828                         data |= VXLAN_RCO_UDP;
1829 
1830                 vxh->vx_vni |= htonl(data);
1831                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1832 
1833                 if (!skb_is_gso(skb)) {
1834                         skb->ip_summed = CHECKSUM_NONE;
1835                         skb->encapsulation = 0;
1836                 }
1837         }
1838 
1839         if (vxflags & VXLAN_F_GBP)
1840                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1841 
1842         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1843 
1844         return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
1845                                    ttl, df, src_port, dst_port, xnet,
1846                                    !(vxflags & VXLAN_F_UDP_CSUM));
1847 }
1848 
1849 #if IS_ENABLED(CONFIG_IPV6)
1850 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1851                                           struct sk_buff *skb, int oif,
1852                                           const struct in6_addr *daddr,
1853                                           struct in6_addr *saddr)
1854 {
1855         struct dst_entry *ndst;
1856         struct flowi6 fl6;
1857         int err;
1858 
1859         memset(&fl6, 0, sizeof(fl6));
1860         fl6.flowi6_oif = oif;
1861         fl6.daddr = *daddr;
1862         fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1863         fl6.flowi6_mark = skb->mark;
1864         fl6.flowi6_proto = IPPROTO_UDP;
1865 
1866         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1867                                          vxlan->vn6_sock->sock->sk,
1868                                          &ndst, &fl6);
1869         if (err < 0)
1870                 return ERR_PTR(err);
1871 
1872         *saddr = fl6.saddr;
1873         return ndst;
1874 }
1875 #endif
1876 
1877 /* Bypass encapsulation if the destination is local */
1878 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1879                                struct vxlan_dev *dst_vxlan)
1880 {
1881         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1882         union vxlan_addr loopback;
1883         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1884         struct net_device *dev = skb->dev;
1885         int len = skb->len;
1886 
1887         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1888         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1889         skb->pkt_type = PACKET_HOST;
1890         skb->encapsulation = 0;
1891         skb->dev = dst_vxlan->dev;
1892         __skb_pull(skb, skb_network_offset(skb));
1893 
1894         if (remote_ip->sa.sa_family == AF_INET) {
1895                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1896                 loopback.sa.sa_family =  AF_INET;
1897 #if IS_ENABLED(CONFIG_IPV6)
1898         } else {
1899                 loopback.sin6.sin6_addr = in6addr_loopback;
1900                 loopback.sa.sa_family =  AF_INET6;
1901 #endif
1902         }
1903 
1904         if (dst_vxlan->flags & VXLAN_F_LEARN)
1905                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1906 
1907         u64_stats_update_begin(&tx_stats->syncp);
1908         tx_stats->tx_packets++;
1909         tx_stats->tx_bytes += len;
1910         u64_stats_update_end(&tx_stats->syncp);
1911 
1912         if (netif_rx(skb) == NET_RX_SUCCESS) {
1913                 u64_stats_update_begin(&rx_stats->syncp);
1914                 rx_stats->rx_packets++;
1915                 rx_stats->rx_bytes += len;
1916                 u64_stats_update_end(&rx_stats->syncp);
1917         } else {
1918                 dev->stats.rx_dropped++;
1919         }
1920 }
1921 
1922 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1923                            struct vxlan_rdst *rdst, bool did_rsc)
1924 {
1925         struct ip_tunnel_info *info;
1926         struct vxlan_dev *vxlan = netdev_priv(dev);
1927         struct sock *sk;
1928         struct rtable *rt = NULL;
1929         const struct iphdr *old_iph;
1930         struct flowi4 fl4;
1931         union vxlan_addr *dst;
1932         union vxlan_addr remote_ip;
1933         struct vxlan_metadata _md;
1934         struct vxlan_metadata *md = &_md;
1935         __be16 src_port = 0, dst_port;
1936         u32 vni;
1937         __be16 df = 0;
1938         __u8 tos, ttl;
1939         int err;
1940         u32 flags = vxlan->flags;
1941 
1942         info = skb_tunnel_info(skb);
1943 
1944         if (rdst) {
1945                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1946                 vni = rdst->remote_vni;
1947                 dst = &rdst->remote_ip;
1948         } else {
1949                 if (!info) {
1950                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1951                                   dev->name);
1952                         goto drop;
1953                 }
1954                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1955                 vni = be64_to_cpu(info->key.tun_id);
1956                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1957                 if (remote_ip.sa.sa_family == AF_INET)
1958                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1959                 else
1960                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1961                 dst = &remote_ip;
1962         }
1963 
1964         if (vxlan_addr_any(dst)) {
1965                 if (did_rsc) {
1966                         /* short-circuited back to local bridge */
1967                         vxlan_encap_bypass(skb, vxlan, vxlan);
1968                         return;
1969                 }
1970                 goto drop;
1971         }
1972 
1973         old_iph = ip_hdr(skb);
1974 
1975         ttl = vxlan->cfg.ttl;
1976         if (!ttl && vxlan_addr_multicast(dst))
1977                 ttl = 1;
1978 
1979         tos = vxlan->cfg.tos;
1980         if (tos == 1)
1981                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1982 
1983         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1984                                      vxlan->cfg.port_max, true);
1985 
1986         if (info) {
1987                 if (info->key.tun_flags & TUNNEL_CSUM)
1988                         flags |= VXLAN_F_UDP_CSUM;
1989                 else
1990                         flags &= ~VXLAN_F_UDP_CSUM;
1991 
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 && (info->key.tun_flags & TUNNEL_DONT_FRAGMENT))
2007                         df = htons(IP_DF);
2008 
2009                 memset(&fl4, 0, sizeof(fl4));
2010                 fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
2011                 fl4.flowi4_tos = RT_TOS(tos);
2012                 fl4.flowi4_mark = skb->mark;
2013                 fl4.flowi4_proto = IPPROTO_UDP;
2014                 fl4.daddr = dst->sin.sin_addr.s_addr;
2015                 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
2016 
2017                 rt = ip_route_output_key(vxlan->net, &fl4);
2018                 if (IS_ERR(rt)) {
2019                         netdev_dbg(dev, "no route to %pI4\n",
2020                                    &dst->sin.sin_addr.s_addr);
2021                         dev->stats.tx_carrier_errors++;
2022                         goto tx_error;
2023                 }
2024 
2025                 if (rt->dst.dev == dev) {
2026                         netdev_dbg(dev, "circular route to %pI4\n",
2027                                    &dst->sin.sin_addr.s_addr);
2028                         dev->stats.collisions++;
2029                         goto rt_tx_error;
2030                 }
2031 
2032                 /* Bypass encapsulation if the destination is local */
2033                 if (rt->rt_flags & RTCF_LOCAL &&
2034                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2035                         struct vxlan_dev *dst_vxlan;
2036 
2037                         ip_rt_put(rt);
2038                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2039                                                    dst->sa.sa_family, dst_port,
2040                                                    vxlan->flags);
2041                         if (!dst_vxlan)
2042                                 goto tx_error;
2043                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2044                         return;
2045                 }
2046 
2047                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2048                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2049                 err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
2050                                      dst->sin.sin_addr.s_addr, tos, ttl, df,
2051                                      src_port, dst_port, htonl(vni << 8), md,
2052                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
2053                                      flags);
2054                 if (err < 0) {
2055                         /* skb is already freed. */
2056                         skb = NULL;
2057                         goto rt_tx_error;
2058                 }
2059 
2060                 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
2061 #if IS_ENABLED(CONFIG_IPV6)
2062         } else {
2063                 struct dst_entry *ndst;
2064                 struct in6_addr saddr;
2065                 u32 rt6i_flags;
2066 
2067                 if (!vxlan->vn6_sock)
2068                         goto drop;
2069                 sk = vxlan->vn6_sock->sock->sk;
2070 
2071                 ndst = vxlan6_get_route(vxlan, skb,
2072                                         rdst ? rdst->remote_ifindex : 0,
2073                                         &dst->sin6.sin6_addr, &saddr);
2074                 if (IS_ERR(ndst)) {
2075                         netdev_dbg(dev, "no route to %pI6\n",
2076                                    &dst->sin6.sin6_addr);
2077                         dev->stats.tx_carrier_errors++;
2078                         goto tx_error;
2079                 }
2080 
2081                 if (ndst->dev == dev) {
2082                         netdev_dbg(dev, "circular route to %pI6\n",
2083                                    &dst->sin6.sin6_addr);
2084                         dst_release(ndst);
2085                         dev->stats.collisions++;
2086                         goto tx_error;
2087                 }
2088 
2089                 /* Bypass encapsulation if the destination is local */
2090                 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2091                 if (rt6i_flags & RTF_LOCAL &&
2092                     !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2093                         struct vxlan_dev *dst_vxlan;
2094 
2095                         dst_release(ndst);
2096                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2097                                                    dst->sa.sa_family, dst_port,
2098                                                    vxlan->flags);
2099                         if (!dst_vxlan)
2100                                 goto tx_error;
2101                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2102                         return;
2103                 }
2104 
2105                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2106                 err = vxlan6_xmit_skb(ndst, sk, skb, dev, &saddr, &dst->sin6.sin6_addr,
2107                                       0, ttl, src_port, dst_port, htonl(vni << 8), md,
2108                                       !net_eq(vxlan->net, dev_net(vxlan->dev)),
2109                                       flags);
2110 #endif
2111         }
2112 
2113         return;
2114 
2115 drop:
2116         dev->stats.tx_dropped++;
2117         goto tx_free;
2118 
2119 rt_tx_error:
2120         ip_rt_put(rt);
2121 tx_error:
2122         dev->stats.tx_errors++;
2123 tx_free:
2124         dev_kfree_skb(skb);
2125 }
2126 
2127 /* Transmit local packets over Vxlan
2128  *
2129  * Outer IP header inherits ECN and DF from inner header.
2130  * Outer UDP destination is the VXLAN assigned port.
2131  *           source port is based on hash of flow
2132  */
2133 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2134 {
2135         struct vxlan_dev *vxlan = netdev_priv(dev);
2136         const struct ip_tunnel_info *info;
2137         struct ethhdr *eth;
2138         bool did_rsc = false;
2139         struct vxlan_rdst *rdst, *fdst = NULL;
2140         struct vxlan_fdb *f;
2141 
2142         info = skb_tunnel_info(skb);
2143 
2144         skb_reset_mac_header(skb);
2145         eth = eth_hdr(skb);
2146 
2147         if ((vxlan->flags & VXLAN_F_PROXY)) {
2148                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2149                         return arp_reduce(dev, skb);
2150 #if IS_ENABLED(CONFIG_IPV6)
2151                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2152                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2153                                        + sizeof(struct nd_msg)) &&
2154                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2155                                 struct nd_msg *msg;
2156 
2157                                 msg = (struct nd_msg *)skb_transport_header(skb);
2158                                 if (msg->icmph.icmp6_code == 0 &&
2159                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2160                                         return neigh_reduce(dev, skb);
2161                 }
2162                 eth = eth_hdr(skb);
2163 #endif
2164         }
2165 
2166         if (vxlan->flags & VXLAN_F_COLLECT_METADATA &&
2167             info && info->mode & IP_TUNNEL_INFO_TX) {
2168                 vxlan_xmit_one(skb, dev, NULL, false);
2169                 return NETDEV_TX_OK;
2170         }
2171 
2172         f = vxlan_find_mac(vxlan, eth->h_dest);
2173         did_rsc = false;
2174 
2175         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2176             (ntohs(eth->h_proto) == ETH_P_IP ||
2177              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2178                 did_rsc = route_shortcircuit(dev, skb);
2179                 if (did_rsc)
2180                         f = vxlan_find_mac(vxlan, eth->h_dest);
2181         }
2182 
2183         if (f == NULL) {
2184                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2185                 if (f == NULL) {
2186                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2187                             !is_multicast_ether_addr(eth->h_dest))
2188                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2189 
2190                         dev->stats.tx_dropped++;
2191                         kfree_skb(skb);
2192                         return NETDEV_TX_OK;
2193                 }
2194         }
2195 
2196         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2197                 struct sk_buff *skb1;
2198 
2199                 if (!fdst) {
2200                         fdst = rdst;
2201                         continue;
2202                 }
2203                 skb1 = skb_clone(skb, GFP_ATOMIC);
2204                 if (skb1)
2205                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2206         }
2207 
2208         if (fdst)
2209                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2210         else
2211                 kfree_skb(skb);
2212         return NETDEV_TX_OK;
2213 }
2214 
2215 /* Walk the forwarding table and purge stale entries */
2216 static void vxlan_cleanup(unsigned long arg)
2217 {
2218         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2219         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2220         unsigned int h;
2221 
2222         if (!netif_running(vxlan->dev))
2223                 return;
2224 
2225         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2226                 struct hlist_node *p, *n;
2227 
2228                 spin_lock_bh(&vxlan->hash_lock);
2229                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2230                         struct vxlan_fdb *f
2231                                 = container_of(p, struct vxlan_fdb, hlist);
2232                         unsigned long timeout;
2233 
2234                         if (f->state & NUD_PERMANENT)
2235                                 continue;
2236 
2237                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2238                         if (time_before_eq(timeout, jiffies)) {
2239                                 netdev_dbg(vxlan->dev,
2240                                            "garbage collect %pM\n",
2241                                            f->eth_addr);
2242                                 f->state = NUD_STALE;
2243                                 vxlan_fdb_destroy(vxlan, f);
2244                         } else if (time_before(timeout, next_timer))
2245                                 next_timer = timeout;
2246                 }
2247                 spin_unlock_bh(&vxlan->hash_lock);
2248         }
2249 
2250         mod_timer(&vxlan->age_timer, next_timer);
2251 }
2252 
2253 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2254 {
2255         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2256         __u32 vni = vxlan->default_dst.remote_vni;
2257 
2258         spin_lock(&vn->sock_lock);
2259         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2260         spin_unlock(&vn->sock_lock);
2261 }
2262 
2263 /* Setup stats when device is created */
2264 static int vxlan_init(struct net_device *dev)
2265 {
2266         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2267         if (!dev->tstats)
2268                 return -ENOMEM;
2269 
2270         return 0;
2271 }
2272 
2273 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2274 {
2275         struct vxlan_fdb *f;
2276 
2277         spin_lock_bh(&vxlan->hash_lock);
2278         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2279         if (f)
2280                 vxlan_fdb_destroy(vxlan, f);
2281         spin_unlock_bh(&vxlan->hash_lock);
2282 }
2283 
2284 static void vxlan_uninit(struct net_device *dev)
2285 {
2286         struct vxlan_dev *vxlan = netdev_priv(dev);
2287 
2288         vxlan_fdb_delete_default(vxlan);
2289 
2290         free_percpu(dev->tstats);
2291 }
2292 
2293 /* Start ageing timer and join group when device is brought up */
2294 static int vxlan_open(struct net_device *dev)
2295 {
2296         struct vxlan_dev *vxlan = netdev_priv(dev);
2297         int ret;
2298 
2299         ret = vxlan_sock_add(vxlan);
2300         if (ret < 0)
2301                 return ret;
2302 
2303         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2304                 ret = vxlan_igmp_join(vxlan);
2305                 if (ret == -EADDRINUSE)
2306                         ret = 0;
2307                 if (ret) {
2308                         vxlan_sock_release(vxlan);
2309                         return ret;
2310                 }
2311         }
2312 
2313         if (vxlan->cfg.age_interval)
2314                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2315 
2316         return ret;
2317 }
2318 
2319 /* Purge the forwarding table */
2320 static void vxlan_flush(struct vxlan_dev *vxlan)
2321 {
2322         unsigned int h;
2323 
2324         spin_lock_bh(&vxlan->hash_lock);
2325         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2326                 struct hlist_node *p, *n;
2327                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2328                         struct vxlan_fdb *f
2329                                 = container_of(p, struct vxlan_fdb, hlist);
2330                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2331                         if (!is_zero_ether_addr(f->eth_addr))
2332                                 vxlan_fdb_destroy(vxlan, f);
2333                 }
2334         }
2335         spin_unlock_bh(&vxlan->hash_lock);
2336 }
2337 
2338 /* Cleanup timer and forwarding table on shutdown */
2339 static int vxlan_stop(struct net_device *dev)
2340 {
2341         struct vxlan_dev *vxlan = netdev_priv(dev);
2342         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2343         int ret = 0;
2344 
2345         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2346             !vxlan_group_used(vn, vxlan))
2347                 ret = vxlan_igmp_leave(vxlan);
2348 
2349         del_timer_sync(&vxlan->age_timer);
2350 
2351         vxlan_flush(vxlan);
2352         vxlan_sock_release(vxlan);
2353 
2354         return ret;
2355 }
2356 
2357 /* Stub, nothing needs to be done. */
2358 static void vxlan_set_multicast_list(struct net_device *dev)
2359 {
2360 }
2361 
2362 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2363 {
2364         struct vxlan_dev *vxlan = netdev_priv(dev);
2365         struct vxlan_rdst *dst = &vxlan->default_dst;
2366         struct net_device *lowerdev;
2367         int max_mtu;
2368 
2369         lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2370         if (lowerdev == NULL)
2371                 return eth_change_mtu(dev, new_mtu);
2372 
2373         if (dst->remote_ip.sa.sa_family == AF_INET6)
2374                 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2375         else
2376                 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2377 
2378         if (new_mtu < 68 || new_mtu > max_mtu)
2379                 return -EINVAL;
2380 
2381         dev->mtu = new_mtu;
2382         return 0;
2383 }
2384 
2385 static int egress_ipv4_tun_info(struct net_device *dev, struct sk_buff *skb,
2386                                 struct ip_tunnel_info *info,
2387                                 __be16 sport, __be16 dport)
2388 {
2389         struct vxlan_dev *vxlan = netdev_priv(dev);
2390         struct rtable *rt;
2391         struct flowi4 fl4;
2392 
2393         memset(&fl4, 0, sizeof(fl4));
2394         fl4.flowi4_tos = RT_TOS(info->key.tos);
2395         fl4.flowi4_mark = skb->mark;
2396         fl4.flowi4_proto = IPPROTO_UDP;
2397         fl4.daddr = info->key.u.ipv4.dst;
2398 
2399         rt = ip_route_output_key(vxlan->net, &fl4);
2400         if (IS_ERR(rt))
2401                 return PTR_ERR(rt);
2402         ip_rt_put(rt);
2403 
2404         info->key.u.ipv4.src = fl4.saddr;
2405         info->key.tp_src = sport;
2406         info->key.tp_dst = dport;
2407         return 0;
2408 }
2409 
2410 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2411 {
2412         struct vxlan_dev *vxlan = netdev_priv(dev);
2413         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2414         __be16 sport, dport;
2415 
2416         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2417                                   vxlan->cfg.port_max, true);
2418         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2419 
2420         if (ip_tunnel_info_af(info) == AF_INET) {
2421                 if (!vxlan->vn4_sock)
2422                         return -EINVAL;
2423                 return egress_ipv4_tun_info(dev, skb, info, sport, dport);
2424         } else {
2425 #if IS_ENABLED(CONFIG_IPV6)
2426                 struct dst_entry *ndst;
2427 
2428                 if (!vxlan->vn6_sock)
2429                         return -EINVAL;
2430                 ndst = vxlan6_get_route(vxlan, skb, 0,
2431                                         &info->key.u.ipv6.dst,
2432                                         &info->key.u.ipv6.src);
2433                 if (IS_ERR(ndst))
2434                         return PTR_ERR(ndst);
2435                 dst_release(ndst);
2436 
2437                 info->key.tp_src = sport;
2438                 info->key.tp_dst = dport;
2439 #else /* !CONFIG_IPV6 */
2440                 return -EPFNOSUPPORT;
2441 #endif
2442         }
2443         return 0;
2444 }
2445 
2446 static const struct net_device_ops vxlan_netdev_ops = {
2447         .ndo_init               = vxlan_init,
2448         .ndo_uninit             = vxlan_uninit,
2449         .ndo_open               = vxlan_open,
2450         .ndo_stop               = vxlan_stop,
2451         .ndo_start_xmit         = vxlan_xmit,
2452         .ndo_get_stats64        = ip_tunnel_get_stats64,
2453         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2454         .ndo_change_mtu         = vxlan_change_mtu,
2455         .ndo_validate_addr      = eth_validate_addr,
2456         .ndo_set_mac_address    = eth_mac_addr,
2457         .ndo_fdb_add            = vxlan_fdb_add,
2458         .ndo_fdb_del            = vxlan_fdb_delete,
2459         .ndo_fdb_dump           = vxlan_fdb_dump,
2460         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2461 };
2462 
2463 /* Info for udev, that this is a virtual tunnel endpoint */
2464 static struct device_type vxlan_type = {
2465         .name = "vxlan",
2466 };
2467 
2468 /* Calls the ndo_add_vxlan_port of the caller in order to
2469  * supply the listening VXLAN udp ports. Callers are expected
2470  * to implement the ndo_add_vxlan_port.
2471  */
2472 void vxlan_get_rx_port(struct net_device *dev)
2473 {
2474         struct vxlan_sock *vs;
2475         struct net *net = dev_net(dev);
2476         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2477         sa_family_t sa_family;
2478         __be16 port;
2479         unsigned int i;
2480 
2481         spin_lock(&vn->sock_lock);
2482         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2483                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2484                         port = inet_sk(vs->sock->sk)->inet_sport;
2485                         sa_family = vxlan_get_sk_family(vs);
2486                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2487                                                             port);
2488                 }
2489         }
2490         spin_unlock(&vn->sock_lock);
2491 }
2492 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2493 
2494 /* Initialize the device structure. */
2495 static void vxlan_setup(struct net_device *dev)
2496 {
2497         struct vxlan_dev *vxlan = netdev_priv(dev);
2498         unsigned int h;
2499 
2500         eth_hw_addr_random(dev);
2501         ether_setup(dev);
2502 
2503         dev->netdev_ops = &vxlan_netdev_ops;
2504         dev->destructor = free_netdev;
2505         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2506 
2507         dev->features   |= NETIF_F_LLTX;
2508         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2509         dev->features   |= NETIF_F_RXCSUM;
2510         dev->features   |= NETIF_F_GSO_SOFTWARE;
2511 
2512         dev->vlan_features = dev->features;
2513         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2514         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2515         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2516         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2517         netif_keep_dst(dev);
2518         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2519 
2520         INIT_LIST_HEAD(&vxlan->next);
2521         spin_lock_init(&vxlan->hash_lock);
2522 
2523         init_timer_deferrable(&vxlan->age_timer);
2524         vxlan->age_timer.function = vxlan_cleanup;
2525         vxlan->age_timer.data = (unsigned long) vxlan;
2526 
2527         vxlan->cfg.dst_port = htons(vxlan_port);
2528 
2529         vxlan->dev = dev;
2530 
2531         gro_cells_init(&vxlan->gro_cells, dev);
2532 
2533         for (h = 0; h < FDB_HASH_SIZE; ++h)
2534                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2535 }
2536 
2537 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2538         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2539         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2540         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2541         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2542         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2543         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2544         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2545         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2546         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2547         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2548         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2549         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2550         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2551         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2552         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2553         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2554         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2555         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2556         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2557         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2558         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2559         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2560         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2561         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2562         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2563 };
2564 
2565 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2566 {
2567         if (tb[IFLA_ADDRESS]) {
2568                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2569                         pr_debug("invalid link address (not ethernet)\n");
2570                         return -EINVAL;
2571                 }
2572 
2573                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2574                         pr_debug("invalid all zero ethernet address\n");
2575                         return -EADDRNOTAVAIL;
2576                 }
2577         }
2578 
2579         if (!data)
2580                 return -EINVAL;
2581 
2582         if (data[IFLA_VXLAN_ID]) {
2583                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2584                 if (id >= VXLAN_VID_MASK)
2585                         return -ERANGE;
2586         }
2587 
2588         if (data[IFLA_VXLAN_PORT_RANGE]) {
2589                 const struct ifla_vxlan_port_range *p
2590                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2591 
2592                 if (ntohs(p->high) < ntohs(p->low)) {
2593                         pr_debug("port range %u .. %u not valid\n",
2594                                  ntohs(p->low), ntohs(p->high));
2595                         return -EINVAL;
2596                 }
2597         }
2598 
2599         return 0;
2600 }
2601 
2602 static void vxlan_get_drvinfo(struct net_device *netdev,
2603                               struct ethtool_drvinfo *drvinfo)
2604 {
2605         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2606         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2607 }
2608 
2609 static const struct ethtool_ops vxlan_ethtool_ops = {
2610         .get_drvinfo    = vxlan_get_drvinfo,
2611         .get_link       = ethtool_op_get_link,
2612 };
2613 
2614 static void vxlan_del_work(struct work_struct *work)
2615 {
2616         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2617         udp_tunnel_sock_release(vs->sock);
2618         kfree_rcu(vs, rcu);
2619 }
2620 
2621 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2622                                         __be16 port, u32 flags)
2623 {
2624         struct socket *sock;
2625         struct udp_port_cfg udp_conf;
2626         int err;
2627 
2628         memset(&udp_conf, 0, sizeof(udp_conf));
2629 
2630         if (ipv6) {
2631                 udp_conf.family = AF_INET6;
2632                 udp_conf.use_udp6_rx_checksums =
2633                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2634                 udp_conf.ipv6_v6only = 1;
2635         } else {
2636                 udp_conf.family = AF_INET;
2637         }
2638 
2639         udp_conf.local_udp_port = port;
2640 
2641         /* Open UDP socket */
2642         err = udp_sock_create(net, &udp_conf, &sock);
2643         if (err < 0)
2644                 return ERR_PTR(err);
2645 
2646         return sock;
2647 }
2648 
2649 /* Create new listen socket if needed */
2650 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2651                                               __be16 port, u32 flags)
2652 {
2653         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2654         struct vxlan_sock *vs;
2655         struct socket *sock;
2656         unsigned int h;
2657         struct udp_tunnel_sock_cfg tunnel_cfg;
2658 
2659         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2660         if (!vs)
2661                 return ERR_PTR(-ENOMEM);
2662 
2663         for (h = 0; h < VNI_HASH_SIZE; ++h)
2664                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2665 
2666         INIT_WORK(&vs->del_work, vxlan_del_work);
2667 
2668         sock = vxlan_create_sock(net, ipv6, port, flags);
2669         if (IS_ERR(sock)) {
2670                 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2671                         PTR_ERR(sock));
2672                 kfree(vs);
2673                 return ERR_CAST(sock);
2674         }
2675 
2676         vs->sock = sock;
2677         atomic_set(&vs->refcnt, 1);
2678         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2679 
2680         /* Initialize the vxlan udp offloads structure */
2681         vs->udp_offloads.port = port;
2682         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2683         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2684 
2685         spin_lock(&vn->sock_lock);
2686         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2687         vxlan_notify_add_rx_port(vs);
2688         spin_unlock(&vn->sock_lock);
2689 
2690         /* Mark socket as an encapsulation socket. */
2691         tunnel_cfg.sk_user_data = vs;
2692         tunnel_cfg.encap_type = 1;
2693         tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2694         tunnel_cfg.encap_destroy = NULL;
2695 
2696         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2697 
2698         return vs;
2699 }
2700 
2701 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2702 {
2703         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2704         struct vxlan_sock *vs = NULL;
2705 
2706         if (!vxlan->cfg.no_share) {
2707                 spin_lock(&vn->sock_lock);
2708                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2709                                      vxlan->cfg.dst_port, vxlan->flags);
2710                 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2711                         spin_unlock(&vn->sock_lock);
2712                         return -EBUSY;
2713                 }
2714                 spin_unlock(&vn->sock_lock);
2715         }
2716         if (!vs)
2717                 vs = vxlan_socket_create(vxlan->net, ipv6,
2718                                          vxlan->cfg.dst_port, vxlan->flags);
2719         if (IS_ERR(vs))
2720                 return PTR_ERR(vs);
2721 #if IS_ENABLED(CONFIG_IPV6)
2722         if (ipv6)
2723                 vxlan->vn6_sock = vs;
2724         else
2725 #endif
2726                 vxlan->vn4_sock = vs;
2727         vxlan_vs_add_dev(vs, vxlan);
2728         return 0;
2729 }
2730 
2731 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2732 {
2733         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2734         bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2735         int ret = 0;
2736 
2737         vxlan->vn4_sock = NULL;
2738 #if IS_ENABLED(CONFIG_IPV6)
2739         vxlan->vn6_sock = NULL;
2740         if (ipv6 || metadata)
2741                 ret = __vxlan_sock_add(vxlan, true);
2742 #endif
2743         if (!ret && (!ipv6 || metadata))
2744                 ret = __vxlan_sock_add(vxlan, false);
2745         if (ret < 0)
2746                 vxlan_sock_release(vxlan);
2747         return ret;
2748 }
2749 
2750 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2751                                struct vxlan_config *conf)
2752 {
2753         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2754         struct vxlan_dev *vxlan = netdev_priv(dev);
2755         struct vxlan_rdst *dst = &vxlan->default_dst;
2756         unsigned short needed_headroom = ETH_HLEN;
2757         int err;
2758         bool use_ipv6 = false;
2759         __be16 default_port = vxlan->cfg.dst_port;
2760 
2761         vxlan->net = src_net;
2762 
2763         dst->remote_vni = conf->vni;
2764 
2765         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2766 
2767         /* Unless IPv6 is explicitly requested, assume IPv4 */
2768         if (!dst->remote_ip.sa.sa_family)
2769                 dst->remote_ip.sa.sa_family = AF_INET;
2770 
2771         if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2772             vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2773                 if (!IS_ENABLED(CONFIG_IPV6))
2774                         return -EPFNOSUPPORT;
2775                 use_ipv6 = true;
2776                 vxlan->flags |= VXLAN_F_IPV6;
2777         }
2778 
2779         if (conf->remote_ifindex) {
2780                 struct net_device *lowerdev
2781                          = __dev_get_by_index(src_net, conf->remote_ifindex);
2782 
2783                 dst->remote_ifindex = conf->remote_ifindex;
2784 
2785                 if (!lowerdev) {
2786                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2787                         return -ENODEV;
2788                 }
2789 
2790 #if IS_ENABLED(CONFIG_IPV6)
2791                 if (use_ipv6) {
2792                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2793                         if (idev && idev->cnf.disable_ipv6) {
2794                                 pr_info("IPv6 is disabled via sysctl\n");
2795                                 return -EPERM;
2796                         }
2797                 }
2798 #endif
2799 
2800                 if (!conf->mtu)
2801                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2802 
2803                 needed_headroom = lowerdev->hard_header_len;
2804         }
2805 
2806         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2807                 needed_headroom += VXLAN6_HEADROOM;
2808         else
2809                 needed_headroom += VXLAN_HEADROOM;
2810         dev->needed_headroom = needed_headroom;
2811 
2812         memcpy(&vxlan->cfg, conf, sizeof(*conf));
2813         if (!vxlan->cfg.dst_port)
2814                 vxlan->cfg.dst_port = default_port;
2815         vxlan->flags |= conf->flags;
2816 
2817         if (!vxlan->cfg.age_interval)
2818                 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2819 
2820         if (vxlan_find_vni(src_net, conf->vni, use_ipv6 ? AF_INET6 : AF_INET,
2821                            vxlan->cfg.dst_port, vxlan->flags))
2822                 return -EEXIST;
2823 
2824         dev->ethtool_ops = &vxlan_ethtool_ops;
2825 
2826         /* create an fdb entry for a valid default destination */
2827         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2828                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2829                                        &vxlan->default_dst.remote_ip,
2830                                        NUD_REACHABLE|NUD_PERMANENT,
2831                                        NLM_F_EXCL|NLM_F_CREATE,
2832                                        vxlan->cfg.dst_port,
2833                                        vxlan->default_dst.remote_vni,
2834                                        vxlan->default_dst.remote_ifindex,
2835                                        NTF_SELF);
2836                 if (err)
2837                         return err;
2838         }
2839 
2840         err = register_netdevice(dev);
2841         if (err) {
2842                 vxlan_fdb_delete_default(vxlan);
2843                 return err;
2844         }
2845 
2846         list_add(&vxlan->next, &vn->vxlan_list);
2847 
2848         return 0;
2849 }
2850 
2851 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2852                                     u8 name_assign_type, struct vxlan_config *conf)
2853 {
2854         struct nlattr *tb[IFLA_MAX+1];
2855         struct net_device *dev;
2856         int err;
2857 
2858         memset(&tb, 0, sizeof(tb));
2859 
2860         dev = rtnl_create_link(net, name, name_assign_type,
2861                                &vxlan_link_ops, tb);
2862         if (IS_ERR(dev))
2863                 return dev;
2864 
2865         err = vxlan_dev_configure(net, dev, conf);
2866         if (err < 0) {
2867                 free_netdev(dev);
2868                 return ERR_PTR(err);
2869         }
2870 
2871         return dev;
2872 }
2873 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2874 
2875 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2876                          struct nlattr *tb[], struct nlattr *data[])
2877 {
2878         struct vxlan_config conf;
2879         int err;
2880 
2881         memset(&conf, 0, sizeof(conf));
2882 
2883         if (data[IFLA_VXLAN_ID])
2884                 conf.vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2885 
2886         if (data[IFLA_VXLAN_GROUP]) {
2887                 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2888         } else if (data[IFLA_VXLAN_GROUP6]) {
2889                 if (!IS_ENABLED(CONFIG_IPV6))
2890                         return -EPFNOSUPPORT;
2891 
2892                 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2893                 conf.remote_ip.sa.sa_family = AF_INET6;
2894         }
2895 
2896         if (data[IFLA_VXLAN_LOCAL]) {
2897                 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2898                 conf.saddr.sa.sa_family = AF_INET;
2899         } else if (data[IFLA_VXLAN_LOCAL6]) {
2900                 if (!IS_ENABLED(CONFIG_IPV6))
2901                         return -EPFNOSUPPORT;
2902 
2903                 /* TODO: respect scope id */
2904                 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2905                 conf.saddr.sa.sa_family = AF_INET6;
2906         }
2907 
2908         if (data[IFLA_VXLAN_LINK])
2909                 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2910 
2911         if (data[IFLA_VXLAN_TOS])
2912                 conf.tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2913 
2914         if (data[IFLA_VXLAN_TTL])
2915                 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2916 
2917         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2918                 conf.flags |= VXLAN_F_LEARN;
2919 
2920         if (data[IFLA_VXLAN_AGEING])
2921                 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2922 
2923         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2924                 conf.flags |= VXLAN_F_PROXY;
2925 
2926         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2927                 conf.flags |= VXLAN_F_RSC;
2928 
2929         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2930                 conf.flags |= VXLAN_F_L2MISS;
2931 
2932         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2933                 conf.flags |= VXLAN_F_L3MISS;
2934 
2935         if (data[IFLA_VXLAN_LIMIT])
2936                 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2937 
2938         if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2939             nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2940                 conf.flags |= VXLAN_F_COLLECT_METADATA;
2941 
2942         if (data[IFLA_VXLAN_PORT_RANGE]) {
2943                 const struct ifla_vxlan_port_range *p
2944                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2945                 conf.port_min = ntohs(p->low);
2946                 conf.port_max = ntohs(p->high);
2947         }
2948 
2949         if (data[IFLA_VXLAN_PORT])
2950                 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2951 
2952         if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2953                 conf.flags |= VXLAN_F_UDP_CSUM;
2954 
2955         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2956             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2957                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2958 
2959         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2960             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2961                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2962 
2963         if (data[IFLA_VXLAN_REMCSUM_TX] &&
2964             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2965                 conf.flags |= VXLAN_F_REMCSUM_TX;
2966 
2967         if (data[IFLA_VXLAN_REMCSUM_RX] &&
2968             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2969                 conf.flags |= VXLAN_F_REMCSUM_RX;
2970 
2971         if (data[IFLA_VXLAN_GBP])
2972                 conf.flags |= VXLAN_F_GBP;
2973 
2974         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2975                 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2976 
2977         err = vxlan_dev_configure(src_net, dev, &conf);
2978         switch (err) {
2979         case -ENODEV:
2980                 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2981                 break;
2982 
2983         case -EPERM:
2984                 pr_info("IPv6 is disabled via sysctl\n");
2985                 break;
2986 
2987         case -EEXIST:
2988                 pr_info("duplicate VNI %u\n", conf.vni);
2989                 break;
2990         }
2991 
2992         return err;
2993 }
2994 
2995 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2996 {
2997         struct vxlan_dev *vxlan = netdev_priv(dev);
2998         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2999 
3000         spin_lock(&vn->sock_lock);
3001         if (!hlist_unhashed(&vxlan->hlist))
3002                 hlist_del_rcu(&vxlan->hlist);
3003         spin_unlock(&vn->sock_lock);
3004 
3005         gro_cells_destroy(&vxlan->gro_cells);
3006         list_del(&vxlan->next);
3007         unregister_netdevice_queue(dev, head);
3008 }
3009 
3010 static size_t vxlan_get_size(const struct net_device *dev)
3011 {
3012 
3013         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
3014                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3015                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3016                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3017                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3018                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3019                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3020                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3021                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3022                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3023                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3024                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3025                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3026                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3027                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3028                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3029                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3030                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3031                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3032                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3033                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3034                 0;
3035 }
3036 
3037 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3038 {
3039         const struct vxlan_dev *vxlan = netdev_priv(dev);
3040         const struct vxlan_rdst *dst = &vxlan->default_dst;
3041         struct ifla_vxlan_port_range ports = {
3042                 .low =  htons(vxlan->cfg.port_min),
3043                 .high = htons(vxlan->cfg.port_max),
3044         };
3045 
3046         if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
3047                 goto nla_put_failure;
3048 
3049         if (!vxlan_addr_any(&dst->remote_ip)) {
3050                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3051                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3052                                             dst->remote_ip.sin.sin_addr.s_addr))
3053                                 goto nla_put_failure;
3054 #if IS_ENABLED(CONFIG_IPV6)
3055                 } else {
3056                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3057                                              &dst->remote_ip.sin6.sin6_addr))
3058                                 goto nla_put_failure;
3059 #endif
3060                 }
3061         }
3062 
3063         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3064                 goto nla_put_failure;
3065 
3066         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3067                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3068                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3069                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3070                                 goto nla_put_failure;
3071 #if IS_ENABLED(CONFIG_IPV6)
3072                 } else {
3073                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3074                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3075                                 goto nla_put_failure;
3076 #endif
3077                 }
3078         }
3079 
3080         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3081             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3082             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3083                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
3084             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3085                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
3086             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3087             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3088                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3089             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3090                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3091             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3092                        !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3093             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3094             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3095             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3096             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3097                         !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
3098             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3099                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3100             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3101                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3102             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3103                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3104             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3105                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3106                 goto nla_put_failure;
3107 
3108         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3109                 goto nla_put_failure;
3110 
3111         if (vxlan->flags & VXLAN_F_GBP &&
3112             nla_put_flag(skb, IFLA_VXLAN_GBP))
3113                 goto nla_put_failure;
3114 
3115         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3116             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3117                 goto nla_put_failure;
3118 
3119         return 0;
3120 
3121 nla_put_failure:
3122         return -EMSGSIZE;
3123 }
3124 
3125 static struct net *vxlan_get_link_net(const struct net_device *dev)
3126 {
3127         struct vxlan_dev *vxlan = netdev_priv(dev);
3128 
3129         return vxlan->net;
3130 }
3131 
3132 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3133         .kind           = "vxlan",
3134         .maxtype        = IFLA_VXLAN_MAX,
3135         .policy         = vxlan_policy,
3136         .priv_size      = sizeof(struct vxlan_dev),
3137         .setup          = vxlan_setup,
3138         .validate       = vxlan_validate,
3139         .newlink        = vxlan_newlink,
3140         .dellink        = vxlan_dellink,
3141         .get_size       = vxlan_get_size,
3142         .fill_info      = vxlan_fill_info,
3143         .get_link_net   = vxlan_get_link_net,
3144 };
3145 
3146 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3147                                              struct net_device *dev)
3148 {
3149         struct vxlan_dev *vxlan, *next;
3150         LIST_HEAD(list_kill);
3151 
3152         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3153                 struct vxlan_rdst *dst = &vxlan->default_dst;
3154 
3155                 /* In case we created vxlan device with carrier
3156                  * and we loose the carrier due to module unload
3157                  * we also need to remove vxlan device. In other
3158                  * cases, it's not necessary and remote_ifindex
3159                  * is 0 here, so no matches.
3160                  */
3161                 if (dst->remote_ifindex == dev->ifindex)
3162                         vxlan_dellink(vxlan->dev, &list_kill);
3163         }
3164 
3165         unregister_netdevice_many(&list_kill);
3166 }
3167 
3168 static int vxlan_lowerdev_event(struct notifier_block *unused,
3169                                 unsigned long event, void *ptr)
3170 {
3171         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3172         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3173 
3174         if (event == NETDEV_UNREGISTER)
3175                 vxlan_handle_lowerdev_unregister(vn, dev);
3176 
3177         return NOTIFY_DONE;
3178 }
3179 
3180 static struct notifier_block vxlan_notifier_block __read_mostly = {
3181         .notifier_call = vxlan_lowerdev_event,
3182 };
3183 
3184 static __net_init int vxlan_init_net(struct net *net)
3185 {
3186         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3187         unsigned int h;
3188 
3189         INIT_LIST_HEAD(&vn->vxlan_list);
3190         spin_lock_init(&vn->sock_lock);
3191 
3192         for (h = 0; h < PORT_HASH_SIZE; ++h)
3193                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3194 
3195         return 0;
3196 }
3197 
3198 static void __net_exit vxlan_exit_net(struct net *net)
3199 {
3200         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3201         struct vxlan_dev *vxlan, *next;
3202         struct net_device *dev, *aux;
3203         LIST_HEAD(list);
3204 
3205         rtnl_lock();
3206         for_each_netdev_safe(net, dev, aux)
3207                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3208                         unregister_netdevice_queue(dev, &list);
3209 
3210         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3211                 /* If vxlan->dev is in the same netns, it has already been added
3212                  * to the list by the previous loop.
3213                  */
3214                 if (!net_eq(dev_net(vxlan->dev), net)) {
3215                         gro_cells_destroy(&vxlan->gro_cells);
3216                         unregister_netdevice_queue(vxlan->dev, &list);
3217                 }
3218         }
3219 
3220         unregister_netdevice_many(&list);
3221         rtnl_unlock();
3222 }
3223 
3224 static struct pernet_operations vxlan_net_ops = {
3225         .init = vxlan_init_net,
3226         .exit = vxlan_exit_net,
3227         .id   = &vxlan_net_id,
3228         .size = sizeof(struct vxlan_net),
3229 };
3230 
3231 static int __init vxlan_init_module(void)
3232 {
3233         int rc;
3234 
3235         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3236         if (!vxlan_wq)
3237                 return -ENOMEM;
3238 
3239         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3240 
3241         rc = register_pernet_subsys(&vxlan_net_ops);
3242         if (rc)
3243                 goto out1;
3244 
3245         rc = register_netdevice_notifier(&vxlan_notifier_block);
3246         if (rc)
3247                 goto out2;
3248 
3249         rc = rtnl_link_register(&vxlan_link_ops);
3250         if (rc)
3251                 goto out3;
3252 
3253         return 0;
3254 out3:
3255         unregister_netdevice_notifier(&vxlan_notifier_block);
3256 out2:
3257         unregister_pernet_subsys(&vxlan_net_ops);
3258 out1:
3259         destroy_workqueue(vxlan_wq);
3260         return rc;
3261 }
3262 late_initcall(vxlan_init_module);
3263 
3264 static void __exit vxlan_cleanup_module(void)
3265 {
3266         rtnl_link_unregister(&vxlan_link_ops);
3267         unregister_netdevice_notifier(&vxlan_notifier_block);
3268         destroy_workqueue(vxlan_wq);
3269         unregister_pernet_subsys(&vxlan_net_ops);
3270         /* rcu_barrier() is called by netns */
3271 }
3272 module_exit(vxlan_cleanup_module);
3273 
3274 MODULE_LICENSE("GPL");
3275 MODULE_VERSION(VXLAN_VERSION);
3276 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3277 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3278 MODULE_ALIAS_RTNL_LINK("vxlan");
3279 

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