Version:  2.0.40 2.2.26 2.4.37 3.4 3.5 3.6 3.7 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

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 
 53 #define VXLAN_VERSION   "0.1"
 54 
 55 #define PORT_HASH_BITS  8
 56 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
 57 #define VNI_HASH_BITS   10
 58 #define VNI_HASH_SIZE   (1<<VNI_HASH_BITS)
 59 #define FDB_HASH_BITS   8
 60 #define FDB_HASH_SIZE   (1<<FDB_HASH_BITS)
 61 #define FDB_AGE_DEFAULT 300 /* 5 min */
 62 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
 63 
 64 /* UDP port for VXLAN traffic.
 65  * The IANA assigned port is 4789, but the Linux default is 8472
 66  * for compatibility with early adopters.
 67  */
 68 static unsigned short vxlan_port __read_mostly = 8472;
 69 module_param_named(udp_port, vxlan_port, ushort, 0444);
 70 MODULE_PARM_DESC(udp_port, "Destination UDP port");
 71 
 72 static bool log_ecn_error = true;
 73 module_param(log_ecn_error, bool, 0644);
 74 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
 75 
 76 static int vxlan_net_id;
 77 
 78 static const u8 all_zeros_mac[ETH_ALEN];
 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 union vxlan_addr {
 88         struct sockaddr_in sin;
 89         struct sockaddr_in6 sin6;
 90         struct sockaddr sa;
 91 };
 92 
 93 struct vxlan_rdst {
 94         union vxlan_addr         remote_ip;
 95         __be16                   remote_port;
 96         u32                      remote_vni;
 97         u32                      remote_ifindex;
 98         struct list_head         list;
 99         struct rcu_head          rcu;
100 };
101 
102 /* Forwarding table entry */
103 struct vxlan_fdb {
104         struct hlist_node hlist;        /* linked list of entries */
105         struct rcu_head   rcu;
106         unsigned long     updated;      /* jiffies */
107         unsigned long     used;
108         struct list_head  remotes;
109         u16               state;        /* see ndm_state */
110         u8                flags;        /* see ndm_flags */
111         u8                eth_addr[ETH_ALEN];
112 };
113 
114 /* Pseudo network device */
115 struct vxlan_dev {
116         struct hlist_node hlist;        /* vni hash table */
117         struct list_head  next;         /* vxlan's per namespace list */
118         struct vxlan_sock *vn_sock;     /* listening socket */
119         struct net_device *dev;
120         struct net        *net;         /* netns for packet i/o */
121         struct vxlan_rdst default_dst;  /* default destination */
122         union vxlan_addr  saddr;        /* source address */
123         __be16            dst_port;
124         __u16             port_min;     /* source port range */
125         __u16             port_max;
126         __u8              tos;          /* TOS override */
127         __u8              ttl;
128         u32               flags;        /* VXLAN_F_* in vxlan.h */
129 
130         struct work_struct sock_work;
131         struct work_struct igmp_join;
132         struct work_struct igmp_leave;
133 
134         unsigned long     age_interval;
135         struct timer_list age_timer;
136         spinlock_t        hash_lock;
137         unsigned int      addrcnt;
138         unsigned int      addrmax;
139 
140         struct hlist_head fdb_head[FDB_HASH_SIZE];
141 };
142 
143 /* salt for hash table */
144 static u32 vxlan_salt __read_mostly;
145 static struct workqueue_struct *vxlan_wq;
146 
147 static void vxlan_sock_work(struct work_struct *work);
148 
149 #if IS_ENABLED(CONFIG_IPV6)
150 static inline
151 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
152 {
153        if (a->sa.sa_family != b->sa.sa_family)
154                return false;
155        if (a->sa.sa_family == AF_INET6)
156                return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
157        else
158                return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
159 }
160 
161 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
162 {
163        if (ipa->sa.sa_family == AF_INET6)
164                return ipv6_addr_any(&ipa->sin6.sin6_addr);
165        else
166                return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
167 }
168 
169 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
170 {
171        if (ipa->sa.sa_family == AF_INET6)
172                return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
173        else
174                return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
175 }
176 
177 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
178 {
179        if (nla_len(nla) >= sizeof(struct in6_addr)) {
180                nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
181                ip->sa.sa_family = AF_INET6;
182                return 0;
183        } else if (nla_len(nla) >= sizeof(__be32)) {
184                ip->sin.sin_addr.s_addr = nla_get_be32(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        if (ip->sa.sa_family == AF_INET6)
196                return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
197        else
198                return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
199 }
200 
201 #else /* !CONFIG_IPV6 */
202 
203 static inline
204 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
205 {
206        return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
207 }
208 
209 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
210 {
211        return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
212 }
213 
214 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
215 {
216        return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
217 }
218 
219 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
220 {
221        if (nla_len(nla) >= sizeof(struct in6_addr)) {
222                return -EAFNOSUPPORT;
223        } else if (nla_len(nla) >= sizeof(__be32)) {
224                ip->sin.sin_addr.s_addr = nla_get_be32(nla);
225                ip->sa.sa_family = AF_INET;
226                return 0;
227        } else {
228                return -EAFNOSUPPORT;
229        }
230 }
231 
232 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
233                              const union vxlan_addr *ip)
234 {
235        return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
236 }
237 #endif
238 
239 /* Virtual Network hash table head */
240 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
241 {
242         return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
243 }
244 
245 /* Socket hash table head */
246 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
247 {
248         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
249 
250         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
251 }
252 
253 /* First remote destination for a forwarding entry.
254  * Guaranteed to be non-NULL because remotes are never deleted.
255  */
256 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
257 {
258         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
259 }
260 
261 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
262 {
263         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
264 }
265 
266 /* Find VXLAN socket based on network namespace, address family and UDP port
267  * and enabled unshareable flags.
268  */
269 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
270                                           __be16 port, u32 flags)
271 {
272         struct vxlan_sock *vs;
273 
274         flags &= VXLAN_F_RCV_FLAGS;
275 
276         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
277                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
278                     inet_sk(vs->sock->sk)->sk.sk_family == family &&
279                     vs->flags == flags)
280                         return vs;
281         }
282         return NULL;
283 }
284 
285 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
286 {
287         struct vxlan_dev *vxlan;
288 
289         hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
290                 if (vxlan->default_dst.remote_vni == id)
291                         return vxlan;
292         }
293 
294         return NULL;
295 }
296 
297 /* Look up VNI in a per net namespace table */
298 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
299                                         sa_family_t family, __be16 port,
300                                         u32 flags)
301 {
302         struct vxlan_sock *vs;
303 
304         vs = vxlan_find_sock(net, family, port, flags);
305         if (!vs)
306                 return NULL;
307 
308         return vxlan_vs_find_vni(vs, id);
309 }
310 
311 /* Fill in neighbour message in skbuff. */
312 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
313                           const struct vxlan_fdb *fdb,
314                           u32 portid, u32 seq, int type, unsigned int flags,
315                           const struct vxlan_rdst *rdst)
316 {
317         unsigned long now = jiffies;
318         struct nda_cacheinfo ci;
319         struct nlmsghdr *nlh;
320         struct ndmsg *ndm;
321         bool send_ip, send_eth;
322 
323         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
324         if (nlh == NULL)
325                 return -EMSGSIZE;
326 
327         ndm = nlmsg_data(nlh);
328         memset(ndm, 0, sizeof(*ndm));
329 
330         send_eth = send_ip = true;
331 
332         if (type == RTM_GETNEIGH) {
333                 ndm->ndm_family = AF_INET;
334                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
335                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
336         } else
337                 ndm->ndm_family = AF_BRIDGE;
338         ndm->ndm_state = fdb->state;
339         ndm->ndm_ifindex = vxlan->dev->ifindex;
340         ndm->ndm_flags = fdb->flags;
341         ndm->ndm_type = RTN_UNICAST;
342 
343         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
344             nla_put_s32(skb, NDA_LINK_NETNSID,
345                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
346                 goto nla_put_failure;
347 
348         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
349                 goto nla_put_failure;
350 
351         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
352                 goto nla_put_failure;
353 
354         if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
355             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
356                 goto nla_put_failure;
357         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
358             nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
359                 goto nla_put_failure;
360         if (rdst->remote_ifindex &&
361             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
362                 goto nla_put_failure;
363 
364         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
365         ci.ndm_confirmed = 0;
366         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
367         ci.ndm_refcnt    = 0;
368 
369         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
370                 goto nla_put_failure;
371 
372         nlmsg_end(skb, nlh);
373         return 0;
374 
375 nla_put_failure:
376         nlmsg_cancel(skb, nlh);
377         return -EMSGSIZE;
378 }
379 
380 static inline size_t vxlan_nlmsg_size(void)
381 {
382         return NLMSG_ALIGN(sizeof(struct ndmsg))
383                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
384                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
385                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
386                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
387                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
388                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
389                 + nla_total_size(sizeof(struct nda_cacheinfo));
390 }
391 
392 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
393                              struct vxlan_rdst *rd, int type)
394 {
395         struct net *net = dev_net(vxlan->dev);
396         struct sk_buff *skb;
397         int err = -ENOBUFS;
398 
399         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
400         if (skb == NULL)
401                 goto errout;
402 
403         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
404         if (err < 0) {
405                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
406                 WARN_ON(err == -EMSGSIZE);
407                 kfree_skb(skb);
408                 goto errout;
409         }
410 
411         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
412         return;
413 errout:
414         if (err < 0)
415                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
416 }
417 
418 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
419 {
420         struct vxlan_dev *vxlan = netdev_priv(dev);
421         struct vxlan_fdb f = {
422                 .state = NUD_STALE,
423         };
424         struct vxlan_rdst remote = {
425                 .remote_ip = *ipa, /* goes to NDA_DST */
426                 .remote_vni = VXLAN_N_VID,
427         };
428 
429         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
430 }
431 
432 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
433 {
434         struct vxlan_fdb f = {
435                 .state = NUD_STALE,
436         };
437         struct vxlan_rdst remote = { };
438 
439         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
440 
441         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
442 }
443 
444 /* Hash Ethernet address */
445 static u32 eth_hash(const unsigned char *addr)
446 {
447         u64 value = get_unaligned((u64 *)addr);
448 
449         /* only want 6 bytes */
450 #ifdef __BIG_ENDIAN
451         value >>= 16;
452 #else
453         value <<= 16;
454 #endif
455         return hash_64(value, FDB_HASH_BITS);
456 }
457 
458 /* Hash chain to use given mac address */
459 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
460                                                 const u8 *mac)
461 {
462         return &vxlan->fdb_head[eth_hash(mac)];
463 }
464 
465 /* Look up Ethernet address in forwarding table */
466 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
467                                         const u8 *mac)
468 {
469         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
470         struct vxlan_fdb *f;
471 
472         hlist_for_each_entry_rcu(f, head, hlist) {
473                 if (ether_addr_equal(mac, f->eth_addr))
474                         return f;
475         }
476 
477         return NULL;
478 }
479 
480 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
481                                         const u8 *mac)
482 {
483         struct vxlan_fdb *f;
484 
485         f = __vxlan_find_mac(vxlan, mac);
486         if (f)
487                 f->used = jiffies;
488 
489         return f;
490 }
491 
492 /* caller should hold vxlan->hash_lock */
493 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
494                                               union vxlan_addr *ip, __be16 port,
495                                               __u32 vni, __u32 ifindex)
496 {
497         struct vxlan_rdst *rd;
498 
499         list_for_each_entry(rd, &f->remotes, list) {
500                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
501                     rd->remote_port == port &&
502                     rd->remote_vni == vni &&
503                     rd->remote_ifindex == ifindex)
504                         return rd;
505         }
506 
507         return NULL;
508 }
509 
510 /* Replace destination of unicast mac */
511 static int vxlan_fdb_replace(struct vxlan_fdb *f,
512                              union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
513 {
514         struct vxlan_rdst *rd;
515 
516         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
517         if (rd)
518                 return 0;
519 
520         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
521         if (!rd)
522                 return 0;
523         rd->remote_ip = *ip;
524         rd->remote_port = port;
525         rd->remote_vni = vni;
526         rd->remote_ifindex = ifindex;
527         return 1;
528 }
529 
530 /* Add/update destinations for multicast */
531 static int vxlan_fdb_append(struct vxlan_fdb *f,
532                             union vxlan_addr *ip, __be16 port, __u32 vni,
533                             __u32 ifindex, struct vxlan_rdst **rdp)
534 {
535         struct vxlan_rdst *rd;
536 
537         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
538         if (rd)
539                 return 0;
540 
541         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
542         if (rd == NULL)
543                 return -ENOBUFS;
544         rd->remote_ip = *ip;
545         rd->remote_port = port;
546         rd->remote_vni = vni;
547         rd->remote_ifindex = ifindex;
548 
549         list_add_tail_rcu(&rd->list, &f->remotes);
550 
551         *rdp = rd;
552         return 1;
553 }
554 
555 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
556                                           unsigned int off,
557                                           struct vxlanhdr *vh, size_t hdrlen,
558                                           u32 data, struct gro_remcsum *grc,
559                                           bool nopartial)
560 {
561         size_t start, offset, plen;
562 
563         if (skb->remcsum_offload)
564                 return NULL;
565 
566         if (!NAPI_GRO_CB(skb)->csum_valid)
567                 return NULL;
568 
569         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
570         offset = start + ((data & VXLAN_RCO_UDP) ?
571                           offsetof(struct udphdr, check) :
572                           offsetof(struct tcphdr, check));
573 
574         plen = hdrlen + offset + sizeof(u16);
575 
576         /* Pull checksum that will be written */
577         if (skb_gro_header_hard(skb, off + plen)) {
578                 vh = skb_gro_header_slow(skb, off + plen, off);
579                 if (!vh)
580                         return NULL;
581         }
582 
583         skb_gro_remcsum_process(skb, (void *)vh + hdrlen,
584                                 start, offset, grc, nopartial);
585 
586         skb->remcsum_offload = 1;
587 
588         return vh;
589 }
590 
591 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
592                                           struct sk_buff *skb,
593                                           struct udp_offload *uoff)
594 {
595         struct sk_buff *p, **pp = NULL;
596         struct vxlanhdr *vh, *vh2;
597         unsigned int hlen, off_vx;
598         int flush = 1;
599         struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
600                                              udp_offloads);
601         u32 flags;
602         struct gro_remcsum grc;
603 
604         skb_gro_remcsum_init(&grc);
605 
606         off_vx = skb_gro_offset(skb);
607         hlen = off_vx + sizeof(*vh);
608         vh   = skb_gro_header_fast(skb, off_vx);
609         if (skb_gro_header_hard(skb, hlen)) {
610                 vh = skb_gro_header_slow(skb, hlen, off_vx);
611                 if (unlikely(!vh))
612                         goto out;
613         }
614 
615         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
616         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
617 
618         flags = ntohl(vh->vx_flags);
619 
620         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
621                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
622                                        ntohl(vh->vx_vni), &grc,
623                                        !!(vs->flags &
624                                           VXLAN_F_REMCSUM_NOPARTIAL));
625 
626                 if (!vh)
627                         goto out;
628         }
629 
630         flush = 0;
631 
632         for (p = *head; p; p = p->next) {
633                 if (!NAPI_GRO_CB(p)->same_flow)
634                         continue;
635 
636                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
637                 if (vh->vx_flags != vh2->vx_flags ||
638                     vh->vx_vni != vh2->vx_vni) {
639                         NAPI_GRO_CB(p)->same_flow = 0;
640                         continue;
641                 }
642         }
643 
644         pp = eth_gro_receive(head, skb);
645 
646 out:
647         skb_gro_remcsum_cleanup(skb, &grc);
648         NAPI_GRO_CB(skb)->flush |= flush;
649 
650         return pp;
651 }
652 
653 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
654                               struct udp_offload *uoff)
655 {
656         udp_tunnel_gro_complete(skb, nhoff);
657 
658         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
659 }
660 
661 /* Notify netdevs that UDP port started listening */
662 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
663 {
664         struct net_device *dev;
665         struct sock *sk = vs->sock->sk;
666         struct net *net = sock_net(sk);
667         sa_family_t sa_family = sk->sk_family;
668         __be16 port = inet_sk(sk)->inet_sport;
669         int err;
670 
671         if (sa_family == AF_INET) {
672                 err = udp_add_offload(&vs->udp_offloads);
673                 if (err)
674                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
675         }
676 
677         rcu_read_lock();
678         for_each_netdev_rcu(net, dev) {
679                 if (dev->netdev_ops->ndo_add_vxlan_port)
680                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
681                                                             port);
682         }
683         rcu_read_unlock();
684 }
685 
686 /* Notify netdevs that UDP port is no more listening */
687 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
688 {
689         struct net_device *dev;
690         struct sock *sk = vs->sock->sk;
691         struct net *net = sock_net(sk);
692         sa_family_t sa_family = sk->sk_family;
693         __be16 port = inet_sk(sk)->inet_sport;
694 
695         rcu_read_lock();
696         for_each_netdev_rcu(net, dev) {
697                 if (dev->netdev_ops->ndo_del_vxlan_port)
698                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
699                                                             port);
700         }
701         rcu_read_unlock();
702 
703         if (sa_family == AF_INET)
704                 udp_del_offload(&vs->udp_offloads);
705 }
706 
707 /* Add new entry to forwarding table -- assumes lock held */
708 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
709                             const u8 *mac, union vxlan_addr *ip,
710                             __u16 state, __u16 flags,
711                             __be16 port, __u32 vni, __u32 ifindex,
712                             __u8 ndm_flags)
713 {
714         struct vxlan_rdst *rd = NULL;
715         struct vxlan_fdb *f;
716         int notify = 0;
717 
718         f = __vxlan_find_mac(vxlan, mac);
719         if (f) {
720                 if (flags & NLM_F_EXCL) {
721                         netdev_dbg(vxlan->dev,
722                                    "lost race to create %pM\n", mac);
723                         return -EEXIST;
724                 }
725                 if (f->state != state) {
726                         f->state = state;
727                         f->updated = jiffies;
728                         notify = 1;
729                 }
730                 if (f->flags != ndm_flags) {
731                         f->flags = ndm_flags;
732                         f->updated = jiffies;
733                         notify = 1;
734                 }
735                 if ((flags & NLM_F_REPLACE)) {
736                         /* Only change unicasts */
737                         if (!(is_multicast_ether_addr(f->eth_addr) ||
738                              is_zero_ether_addr(f->eth_addr))) {
739                                 int rc = vxlan_fdb_replace(f, ip, port, vni,
740                                                            ifindex);
741 
742                                 if (rc < 0)
743                                         return rc;
744                                 notify |= rc;
745                         } else
746                                 return -EOPNOTSUPP;
747                 }
748                 if ((flags & NLM_F_APPEND) &&
749                     (is_multicast_ether_addr(f->eth_addr) ||
750                      is_zero_ether_addr(f->eth_addr))) {
751                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
752                                                   &rd);
753 
754                         if (rc < 0)
755                                 return rc;
756                         notify |= rc;
757                 }
758         } else {
759                 if (!(flags & NLM_F_CREATE))
760                         return -ENOENT;
761 
762                 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
763                         return -ENOSPC;
764 
765                 /* Disallow replace to add a multicast entry */
766                 if ((flags & NLM_F_REPLACE) &&
767                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
768                         return -EOPNOTSUPP;
769 
770                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
771                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
772                 if (!f)
773                         return -ENOMEM;
774 
775                 notify = 1;
776                 f->state = state;
777                 f->flags = ndm_flags;
778                 f->updated = f->used = jiffies;
779                 INIT_LIST_HEAD(&f->remotes);
780                 memcpy(f->eth_addr, mac, ETH_ALEN);
781 
782                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
783 
784                 ++vxlan->addrcnt;
785                 hlist_add_head_rcu(&f->hlist,
786                                    vxlan_fdb_head(vxlan, mac));
787         }
788 
789         if (notify) {
790                 if (rd == NULL)
791                         rd = first_remote_rtnl(f);
792                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
793         }
794 
795         return 0;
796 }
797 
798 static void vxlan_fdb_free(struct rcu_head *head)
799 {
800         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
801         struct vxlan_rdst *rd, *nd;
802 
803         list_for_each_entry_safe(rd, nd, &f->remotes, list)
804                 kfree(rd);
805         kfree(f);
806 }
807 
808 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
809 {
810         netdev_dbg(vxlan->dev,
811                     "delete %pM\n", f->eth_addr);
812 
813         --vxlan->addrcnt;
814         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
815 
816         hlist_del_rcu(&f->hlist);
817         call_rcu(&f->rcu, vxlan_fdb_free);
818 }
819 
820 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
821                            union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
822 {
823         struct net *net = dev_net(vxlan->dev);
824         int err;
825 
826         if (tb[NDA_DST]) {
827                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
828                 if (err)
829                         return err;
830         } else {
831                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
832                 if (remote->sa.sa_family == AF_INET) {
833                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
834                         ip->sa.sa_family = AF_INET;
835 #if IS_ENABLED(CONFIG_IPV6)
836                 } else {
837                         ip->sin6.sin6_addr = in6addr_any;
838                         ip->sa.sa_family = AF_INET6;
839 #endif
840                 }
841         }
842 
843         if (tb[NDA_PORT]) {
844                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
845                         return -EINVAL;
846                 *port = nla_get_be16(tb[NDA_PORT]);
847         } else {
848                 *port = vxlan->dst_port;
849         }
850 
851         if (tb[NDA_VNI]) {
852                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
853                         return -EINVAL;
854                 *vni = nla_get_u32(tb[NDA_VNI]);
855         } else {
856                 *vni = vxlan->default_dst.remote_vni;
857         }
858 
859         if (tb[NDA_IFINDEX]) {
860                 struct net_device *tdev;
861 
862                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
863                         return -EINVAL;
864                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
865                 tdev = __dev_get_by_index(net, *ifindex);
866                 if (!tdev)
867                         return -EADDRNOTAVAIL;
868         } else {
869                 *ifindex = 0;
870         }
871 
872         return 0;
873 }
874 
875 /* Add static entry (via netlink) */
876 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
877                          struct net_device *dev,
878                          const unsigned char *addr, u16 vid, u16 flags)
879 {
880         struct vxlan_dev *vxlan = netdev_priv(dev);
881         /* struct net *net = dev_net(vxlan->dev); */
882         union vxlan_addr ip;
883         __be16 port;
884         u32 vni, ifindex;
885         int err;
886 
887         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
888                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
889                         ndm->ndm_state);
890                 return -EINVAL;
891         }
892 
893         if (tb[NDA_DST] == NULL)
894                 return -EINVAL;
895 
896         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
897         if (err)
898                 return err;
899 
900         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
901                 return -EAFNOSUPPORT;
902 
903         spin_lock_bh(&vxlan->hash_lock);
904         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
905                                port, vni, ifindex, ndm->ndm_flags);
906         spin_unlock_bh(&vxlan->hash_lock);
907 
908         return err;
909 }
910 
911 /* Delete entry (via netlink) */
912 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
913                             struct net_device *dev,
914                             const unsigned char *addr, u16 vid)
915 {
916         struct vxlan_dev *vxlan = netdev_priv(dev);
917         struct vxlan_fdb *f;
918         struct vxlan_rdst *rd = NULL;
919         union vxlan_addr ip;
920         __be16 port;
921         u32 vni, ifindex;
922         int err;
923 
924         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
925         if (err)
926                 return err;
927 
928         err = -ENOENT;
929 
930         spin_lock_bh(&vxlan->hash_lock);
931         f = vxlan_find_mac(vxlan, addr);
932         if (!f)
933                 goto out;
934 
935         if (!vxlan_addr_any(&ip)) {
936                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
937                 if (!rd)
938                         goto out;
939         }
940 
941         err = 0;
942 
943         /* remove a destination if it's not the only one on the list,
944          * otherwise destroy the fdb entry
945          */
946         if (rd && !list_is_singular(&f->remotes)) {
947                 list_del_rcu(&rd->list);
948                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
949                 kfree_rcu(rd, rcu);
950                 goto out;
951         }
952 
953         vxlan_fdb_destroy(vxlan, f);
954 
955 out:
956         spin_unlock_bh(&vxlan->hash_lock);
957 
958         return err;
959 }
960 
961 /* Dump forwarding table */
962 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
963                           struct net_device *dev,
964                           struct net_device *filter_dev, int idx)
965 {
966         struct vxlan_dev *vxlan = netdev_priv(dev);
967         unsigned int h;
968 
969         for (h = 0; h < FDB_HASH_SIZE; ++h) {
970                 struct vxlan_fdb *f;
971                 int err;
972 
973                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
974                         struct vxlan_rdst *rd;
975 
976                         if (idx < cb->args[0])
977                                 goto skip;
978 
979                         list_for_each_entry_rcu(rd, &f->remotes, list) {
980                                 err = vxlan_fdb_info(skb, vxlan, f,
981                                                      NETLINK_CB(cb->skb).portid,
982                                                      cb->nlh->nlmsg_seq,
983                                                      RTM_NEWNEIGH,
984                                                      NLM_F_MULTI, rd);
985                                 if (err < 0)
986                                         goto out;
987                         }
988 skip:
989                         ++idx;
990                 }
991         }
992 out:
993         return idx;
994 }
995 
996 /* Watch incoming packets to learn mapping between Ethernet address
997  * and Tunnel endpoint.
998  * Return true if packet is bogus and should be droppped.
999  */
1000 static bool vxlan_snoop(struct net_device *dev,
1001                         union vxlan_addr *src_ip, const u8 *src_mac)
1002 {
1003         struct vxlan_dev *vxlan = netdev_priv(dev);
1004         struct vxlan_fdb *f;
1005 
1006         f = vxlan_find_mac(vxlan, src_mac);
1007         if (likely(f)) {
1008                 struct vxlan_rdst *rdst = first_remote_rcu(f);
1009 
1010                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
1011                         return false;
1012 
1013                 /* Don't migrate static entries, drop packets */
1014                 if (f->state & NUD_NOARP)
1015                         return true;
1016 
1017                 if (net_ratelimit())
1018                         netdev_info(dev,
1019                                     "%pM migrated from %pIS to %pIS\n",
1020                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1021 
1022                 rdst->remote_ip = *src_ip;
1023                 f->updated = jiffies;
1024                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1025         } else {
1026                 /* learned new entry */
1027                 spin_lock(&vxlan->hash_lock);
1028 
1029                 /* close off race between vxlan_flush and incoming packets */
1030                 if (netif_running(dev))
1031                         vxlan_fdb_create(vxlan, src_mac, src_ip,
1032                                          NUD_REACHABLE,
1033                                          NLM_F_EXCL|NLM_F_CREATE,
1034                                          vxlan->dst_port,
1035                                          vxlan->default_dst.remote_vni,
1036                                          0, NTF_SELF);
1037                 spin_unlock(&vxlan->hash_lock);
1038         }
1039 
1040         return false;
1041 }
1042 
1043 /* See if multicast group is already in use by other ID */
1044 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1045 {
1046         struct vxlan_dev *vxlan;
1047 
1048         /* The vxlan_sock is only used by dev, leaving group has
1049          * no effect on other vxlan devices.
1050          */
1051         if (atomic_read(&dev->vn_sock->refcnt) == 1)
1052                 return false;
1053 
1054         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1055                 if (!netif_running(vxlan->dev) || vxlan == dev)
1056                         continue;
1057 
1058                 if (vxlan->vn_sock != dev->vn_sock)
1059                         continue;
1060 
1061                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1062                                       &dev->default_dst.remote_ip))
1063                         continue;
1064 
1065                 if (vxlan->default_dst.remote_ifindex !=
1066                     dev->default_dst.remote_ifindex)
1067                         continue;
1068 
1069                 return true;
1070         }
1071 
1072         return false;
1073 }
1074 
1075 static void vxlan_sock_hold(struct vxlan_sock *vs)
1076 {
1077         atomic_inc(&vs->refcnt);
1078 }
1079 
1080 void vxlan_sock_release(struct vxlan_sock *vs)
1081 {
1082         struct sock *sk = vs->sock->sk;
1083         struct net *net = sock_net(sk);
1084         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1085 
1086         if (!atomic_dec_and_test(&vs->refcnt))
1087                 return;
1088 
1089         spin_lock(&vn->sock_lock);
1090         hlist_del_rcu(&vs->hlist);
1091         vxlan_notify_del_rx_port(vs);
1092         spin_unlock(&vn->sock_lock);
1093 
1094         queue_work(vxlan_wq, &vs->del_work);
1095 }
1096 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1097 
1098 /* Callback to update multicast group membership when first VNI on
1099  * multicast asddress is brought up
1100  * Done as workqueue because ip_mc_join_group acquires RTNL.
1101  */
1102 static void vxlan_igmp_join(struct work_struct *work)
1103 {
1104         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1105         struct vxlan_sock *vs = vxlan->vn_sock;
1106         struct sock *sk = vs->sock->sk;
1107         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1108         int ifindex = vxlan->default_dst.remote_ifindex;
1109 
1110         lock_sock(sk);
1111         if (ip->sa.sa_family == AF_INET) {
1112                 struct ip_mreqn mreq = {
1113                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1114                         .imr_ifindex            = ifindex,
1115                 };
1116 
1117                 ip_mc_join_group(sk, &mreq);
1118 #if IS_ENABLED(CONFIG_IPV6)
1119         } else {
1120                 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1121                                              &ip->sin6.sin6_addr);
1122 #endif
1123         }
1124         release_sock(sk);
1125 
1126         vxlan_sock_release(vs);
1127         dev_put(vxlan->dev);
1128 }
1129 
1130 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1131 static void vxlan_igmp_leave(struct work_struct *work)
1132 {
1133         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1134         struct vxlan_sock *vs = vxlan->vn_sock;
1135         struct sock *sk = vs->sock->sk;
1136         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1137         int ifindex = vxlan->default_dst.remote_ifindex;
1138 
1139         lock_sock(sk);
1140         if (ip->sa.sa_family == AF_INET) {
1141                 struct ip_mreqn mreq = {
1142                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1143                         .imr_ifindex            = ifindex,
1144                 };
1145 
1146                 ip_mc_leave_group(sk, &mreq);
1147 #if IS_ENABLED(CONFIG_IPV6)
1148         } else {
1149                 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1150                                              &ip->sin6.sin6_addr);
1151 #endif
1152         }
1153 
1154         release_sock(sk);
1155 
1156         vxlan_sock_release(vs);
1157         dev_put(vxlan->dev);
1158 }
1159 
1160 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1161                                       size_t hdrlen, u32 data, bool nopartial)
1162 {
1163         size_t start, offset, plen;
1164 
1165         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1166         offset = start + ((data & VXLAN_RCO_UDP) ?
1167                           offsetof(struct udphdr, check) :
1168                           offsetof(struct tcphdr, check));
1169 
1170         plen = hdrlen + offset + sizeof(u16);
1171 
1172         if (!pskb_may_pull(skb, plen))
1173                 return NULL;
1174 
1175         vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1176 
1177         skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1178                             nopartial);
1179 
1180         return vh;
1181 }
1182 
1183 /* Callback from net/ipv4/udp.c to receive packets */
1184 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1185 {
1186         struct vxlan_sock *vs;
1187         struct vxlanhdr *vxh;
1188         u32 flags, vni;
1189         struct vxlan_metadata md = {0};
1190 
1191         /* Need Vxlan and inner Ethernet header to be present */
1192         if (!pskb_may_pull(skb, VXLAN_HLEN))
1193                 goto error;
1194 
1195         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1196         flags = ntohl(vxh->vx_flags);
1197         vni = ntohl(vxh->vx_vni);
1198 
1199         if (flags & VXLAN_HF_VNI) {
1200                 flags &= ~VXLAN_HF_VNI;
1201         } else {
1202                 /* VNI flag always required to be set */
1203                 goto bad_flags;
1204         }
1205 
1206         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1207                 goto drop;
1208         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1209 
1210         vs = rcu_dereference_sk_user_data(sk);
1211         if (!vs)
1212                 goto drop;
1213 
1214         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1215                 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1216                                     !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1217                 if (!vxh)
1218                         goto drop;
1219 
1220                 flags &= ~VXLAN_HF_RCO;
1221                 vni &= VXLAN_VNI_MASK;
1222         }
1223 
1224         /* For backwards compatibility, only allow reserved fields to be
1225          * used by VXLAN extensions if explicitly requested.
1226          */
1227         if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1228                 struct vxlanhdr_gbp *gbp;
1229 
1230                 gbp = (struct vxlanhdr_gbp *)vxh;
1231                 md.gbp = ntohs(gbp->policy_id);
1232 
1233                 if (gbp->dont_learn)
1234                         md.gbp |= VXLAN_GBP_DONT_LEARN;
1235 
1236                 if (gbp->policy_applied)
1237                         md.gbp |= VXLAN_GBP_POLICY_APPLIED;
1238 
1239                 flags &= ~VXLAN_GBP_USED_BITS;
1240         }
1241 
1242         if (flags || vni & ~VXLAN_VNI_MASK) {
1243                 /* If there are any unprocessed flags remaining treat
1244                  * this as a malformed packet. This behavior diverges from
1245                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1246                  * in reserved fields are to be ignored. The approach here
1247                  * maintains compatbility with previous stack code, and also
1248                  * is more robust and provides a little more security in
1249                  * adding extensions to VXLAN.
1250                  */
1251 
1252                 goto bad_flags;
1253         }
1254 
1255         md.vni = vxh->vx_vni;
1256         vs->rcv(vs, skb, &md);
1257         return 0;
1258 
1259 drop:
1260         /* Consume bad packet */
1261         kfree_skb(skb);
1262         return 0;
1263 
1264 bad_flags:
1265         netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1266                    ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1267 
1268 error:
1269         /* Return non vxlan pkt */
1270         return 1;
1271 }
1272 
1273 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1274                       struct vxlan_metadata *md)
1275 {
1276         struct iphdr *oip = NULL;
1277         struct ipv6hdr *oip6 = NULL;
1278         struct vxlan_dev *vxlan;
1279         struct pcpu_sw_netstats *stats;
1280         union vxlan_addr saddr;
1281         __u32 vni;
1282         int err = 0;
1283         union vxlan_addr *remote_ip;
1284 
1285         vni = ntohl(md->vni) >> 8;
1286         /* Is this VNI defined? */
1287         vxlan = vxlan_vs_find_vni(vs, vni);
1288         if (!vxlan)
1289                 goto drop;
1290 
1291         remote_ip = &vxlan->default_dst.remote_ip;
1292         skb_reset_mac_header(skb);
1293         skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1294         skb->protocol = eth_type_trans(skb, vxlan->dev);
1295         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1296 
1297         /* Ignore packet loops (and multicast echo) */
1298         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1299                 goto drop;
1300 
1301         /* Re-examine inner Ethernet packet */
1302         if (remote_ip->sa.sa_family == AF_INET) {
1303                 oip = ip_hdr(skb);
1304                 saddr.sin.sin_addr.s_addr = oip->saddr;
1305                 saddr.sa.sa_family = AF_INET;
1306 #if IS_ENABLED(CONFIG_IPV6)
1307         } else {
1308                 oip6 = ipv6_hdr(skb);
1309                 saddr.sin6.sin6_addr = oip6->saddr;
1310                 saddr.sa.sa_family = AF_INET6;
1311 #endif
1312         }
1313 
1314         if ((vxlan->flags & VXLAN_F_LEARN) &&
1315             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1316                 goto drop;
1317 
1318         skb_reset_network_header(skb);
1319         skb->mark = md->gbp;
1320 
1321         if (oip6)
1322                 err = IP6_ECN_decapsulate(oip6, skb);
1323         if (oip)
1324                 err = IP_ECN_decapsulate(oip, skb);
1325 
1326         if (unlikely(err)) {
1327                 if (log_ecn_error) {
1328                         if (oip6)
1329                                 net_info_ratelimited("non-ECT from %pI6\n",
1330                                                      &oip6->saddr);
1331                         if (oip)
1332                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1333                                                      &oip->saddr, oip->tos);
1334                 }
1335                 if (err > 1) {
1336                         ++vxlan->dev->stats.rx_frame_errors;
1337                         ++vxlan->dev->stats.rx_errors;
1338                         goto drop;
1339                 }
1340         }
1341 
1342         stats = this_cpu_ptr(vxlan->dev->tstats);
1343         u64_stats_update_begin(&stats->syncp);
1344         stats->rx_packets++;
1345         stats->rx_bytes += skb->len;
1346         u64_stats_update_end(&stats->syncp);
1347 
1348         netif_rx(skb);
1349 
1350         return;
1351 drop:
1352         /* Consume bad packet */
1353         kfree_skb(skb);
1354 }
1355 
1356 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1357 {
1358         struct vxlan_dev *vxlan = netdev_priv(dev);
1359         struct arphdr *parp;
1360         u8 *arpptr, *sha;
1361         __be32 sip, tip;
1362         struct neighbour *n;
1363 
1364         if (dev->flags & IFF_NOARP)
1365                 goto out;
1366 
1367         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1368                 dev->stats.tx_dropped++;
1369                 goto out;
1370         }
1371         parp = arp_hdr(skb);
1372 
1373         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1374              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1375             parp->ar_pro != htons(ETH_P_IP) ||
1376             parp->ar_op != htons(ARPOP_REQUEST) ||
1377             parp->ar_hln != dev->addr_len ||
1378             parp->ar_pln != 4)
1379                 goto out;
1380         arpptr = (u8 *)parp + sizeof(struct arphdr);
1381         sha = arpptr;
1382         arpptr += dev->addr_len;        /* sha */
1383         memcpy(&sip, arpptr, sizeof(sip));
1384         arpptr += sizeof(sip);
1385         arpptr += dev->addr_len;        /* tha */
1386         memcpy(&tip, arpptr, sizeof(tip));
1387 
1388         if (ipv4_is_loopback(tip) ||
1389             ipv4_is_multicast(tip))
1390                 goto out;
1391 
1392         n = neigh_lookup(&arp_tbl, &tip, dev);
1393 
1394         if (n) {
1395                 struct vxlan_fdb *f;
1396                 struct sk_buff  *reply;
1397 
1398                 if (!(n->nud_state & NUD_CONNECTED)) {
1399                         neigh_release(n);
1400                         goto out;
1401                 }
1402 
1403                 f = vxlan_find_mac(vxlan, n->ha);
1404                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1405                         /* bridge-local neighbor */
1406                         neigh_release(n);
1407                         goto out;
1408                 }
1409 
1410                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1411                                 n->ha, sha);
1412 
1413                 neigh_release(n);
1414 
1415                 if (reply == NULL)
1416                         goto out;
1417 
1418                 skb_reset_mac_header(reply);
1419                 __skb_pull(reply, skb_network_offset(reply));
1420                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1421                 reply->pkt_type = PACKET_HOST;
1422 
1423                 if (netif_rx_ni(reply) == NET_RX_DROP)
1424                         dev->stats.rx_dropped++;
1425         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1426                 union vxlan_addr ipa = {
1427                         .sin.sin_addr.s_addr = tip,
1428                         .sin.sin_family = AF_INET,
1429                 };
1430 
1431                 vxlan_ip_miss(dev, &ipa);
1432         }
1433 out:
1434         consume_skb(skb);
1435         return NETDEV_TX_OK;
1436 }
1437 
1438 #if IS_ENABLED(CONFIG_IPV6)
1439 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1440         struct neighbour *n, bool isrouter)
1441 {
1442         struct net_device *dev = request->dev;
1443         struct sk_buff *reply;
1444         struct nd_msg *ns, *na;
1445         struct ipv6hdr *pip6;
1446         u8 *daddr;
1447         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1448         int ns_olen;
1449         int i, len;
1450 
1451         if (dev == NULL)
1452                 return NULL;
1453 
1454         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1455                 sizeof(*na) + na_olen + dev->needed_tailroom;
1456         reply = alloc_skb(len, GFP_ATOMIC);
1457         if (reply == NULL)
1458                 return NULL;
1459 
1460         reply->protocol = htons(ETH_P_IPV6);
1461         reply->dev = dev;
1462         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1463         skb_push(reply, sizeof(struct ethhdr));
1464         skb_set_mac_header(reply, 0);
1465 
1466         ns = (struct nd_msg *)skb_transport_header(request);
1467 
1468         daddr = eth_hdr(request)->h_source;
1469         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1470         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1471                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1472                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1473                         break;
1474                 }
1475         }
1476 
1477         /* Ethernet header */
1478         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1479         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1480         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1481         reply->protocol = htons(ETH_P_IPV6);
1482 
1483         skb_pull(reply, sizeof(struct ethhdr));
1484         skb_set_network_header(reply, 0);
1485         skb_put(reply, sizeof(struct ipv6hdr));
1486 
1487         /* IPv6 header */
1488 
1489         pip6 = ipv6_hdr(reply);
1490         memset(pip6, 0, sizeof(struct ipv6hdr));
1491         pip6->version = 6;
1492         pip6->priority = ipv6_hdr(request)->priority;
1493         pip6->nexthdr = IPPROTO_ICMPV6;
1494         pip6->hop_limit = 255;
1495         pip6->daddr = ipv6_hdr(request)->saddr;
1496         pip6->saddr = *(struct in6_addr *)n->primary_key;
1497 
1498         skb_pull(reply, sizeof(struct ipv6hdr));
1499         skb_set_transport_header(reply, 0);
1500 
1501         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1502 
1503         /* Neighbor Advertisement */
1504         memset(na, 0, sizeof(*na)+na_olen);
1505         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1506         na->icmph.icmp6_router = isrouter;
1507         na->icmph.icmp6_override = 1;
1508         na->icmph.icmp6_solicited = 1;
1509         na->target = ns->target;
1510         ether_addr_copy(&na->opt[2], n->ha);
1511         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1512         na->opt[1] = na_olen >> 3;
1513 
1514         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1515                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1516                 csum_partial(na, sizeof(*na)+na_olen, 0));
1517 
1518         pip6->payload_len = htons(sizeof(*na)+na_olen);
1519 
1520         skb_push(reply, sizeof(struct ipv6hdr));
1521 
1522         reply->ip_summed = CHECKSUM_UNNECESSARY;
1523 
1524         return reply;
1525 }
1526 
1527 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1528 {
1529         struct vxlan_dev *vxlan = netdev_priv(dev);
1530         struct nd_msg *msg;
1531         const struct ipv6hdr *iphdr;
1532         const struct in6_addr *saddr, *daddr;
1533         struct neighbour *n;
1534         struct inet6_dev *in6_dev;
1535 
1536         in6_dev = __in6_dev_get(dev);
1537         if (!in6_dev)
1538                 goto out;
1539 
1540         iphdr = ipv6_hdr(skb);
1541         saddr = &iphdr->saddr;
1542         daddr = &iphdr->daddr;
1543 
1544         msg = (struct nd_msg *)skb_transport_header(skb);
1545         if (msg->icmph.icmp6_code != 0 ||
1546             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1547                 goto out;
1548 
1549         if (ipv6_addr_loopback(daddr) ||
1550             ipv6_addr_is_multicast(&msg->target))
1551                 goto out;
1552 
1553         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1554 
1555         if (n) {
1556                 struct vxlan_fdb *f;
1557                 struct sk_buff *reply;
1558 
1559                 if (!(n->nud_state & NUD_CONNECTED)) {
1560                         neigh_release(n);
1561                         goto out;
1562                 }
1563 
1564                 f = vxlan_find_mac(vxlan, n->ha);
1565                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1566                         /* bridge-local neighbor */
1567                         neigh_release(n);
1568                         goto out;
1569                 }
1570 
1571                 reply = vxlan_na_create(skb, n,
1572                                         !!(f ? f->flags & NTF_ROUTER : 0));
1573 
1574                 neigh_release(n);
1575 
1576                 if (reply == NULL)
1577                         goto out;
1578 
1579                 if (netif_rx_ni(reply) == NET_RX_DROP)
1580                         dev->stats.rx_dropped++;
1581 
1582         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1583                 union vxlan_addr ipa = {
1584                         .sin6.sin6_addr = msg->target,
1585                         .sin6.sin6_family = AF_INET6,
1586                 };
1587 
1588                 vxlan_ip_miss(dev, &ipa);
1589         }
1590 
1591 out:
1592         consume_skb(skb);
1593         return NETDEV_TX_OK;
1594 }
1595 #endif
1596 
1597 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1598 {
1599         struct vxlan_dev *vxlan = netdev_priv(dev);
1600         struct neighbour *n;
1601 
1602         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1603                 return false;
1604 
1605         n = NULL;
1606         switch (ntohs(eth_hdr(skb)->h_proto)) {
1607         case ETH_P_IP:
1608         {
1609                 struct iphdr *pip;
1610 
1611                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1612                         return false;
1613                 pip = ip_hdr(skb);
1614                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1615                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1616                         union vxlan_addr ipa = {
1617                                 .sin.sin_addr.s_addr = pip->daddr,
1618                                 .sin.sin_family = AF_INET,
1619                         };
1620 
1621                         vxlan_ip_miss(dev, &ipa);
1622                         return false;
1623                 }
1624 
1625                 break;
1626         }
1627 #if IS_ENABLED(CONFIG_IPV6)
1628         case ETH_P_IPV6:
1629         {
1630                 struct ipv6hdr *pip6;
1631 
1632                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1633                         return false;
1634                 pip6 = ipv6_hdr(skb);
1635                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1636                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1637                         union vxlan_addr ipa = {
1638                                 .sin6.sin6_addr = pip6->daddr,
1639                                 .sin6.sin6_family = AF_INET6,
1640                         };
1641 
1642                         vxlan_ip_miss(dev, &ipa);
1643                         return false;
1644                 }
1645 
1646                 break;
1647         }
1648 #endif
1649         default:
1650                 return false;
1651         }
1652 
1653         if (n) {
1654                 bool diff;
1655 
1656                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1657                 if (diff) {
1658                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1659                                 dev->addr_len);
1660                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1661                 }
1662                 neigh_release(n);
1663                 return diff;
1664         }
1665 
1666         return false;
1667 }
1668 
1669 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1670                                 struct vxlan_metadata *md)
1671 {
1672         struct vxlanhdr_gbp *gbp;
1673 
1674         if (!md->gbp)
1675                 return;
1676 
1677         gbp = (struct vxlanhdr_gbp *)vxh;
1678         vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1679 
1680         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1681                 gbp->dont_learn = 1;
1682 
1683         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1684                 gbp->policy_applied = 1;
1685 
1686         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1687 }
1688 
1689 #if IS_ENABLED(CONFIG_IPV6)
1690 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sk_buff *skb,
1691                            struct net_device *dev, struct in6_addr *saddr,
1692                            struct in6_addr *daddr, __u8 prio, __u8 ttl,
1693                            __be16 src_port, __be16 dst_port,
1694                            struct vxlan_metadata *md, bool xnet, u32 vxflags)
1695 {
1696         struct vxlanhdr *vxh;
1697         int min_headroom;
1698         int err;
1699         bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1700         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1701         u16 hdrlen = sizeof(struct vxlanhdr);
1702 
1703         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1704             skb->ip_summed == CHECKSUM_PARTIAL) {
1705                 int csum_start = skb_checksum_start_offset(skb);
1706 
1707                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1708                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1709                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1710                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1711                         udp_sum = false;
1712                         type |= SKB_GSO_TUNNEL_REMCSUM;
1713                 }
1714         }
1715 
1716         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1717         if (IS_ERR(skb)) {
1718                 err = -EINVAL;
1719                 goto err;
1720         }
1721 
1722         skb_scrub_packet(skb, xnet);
1723 
1724         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1725                         + VXLAN_HLEN + sizeof(struct ipv6hdr)
1726                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1727 
1728         /* Need space for new headers (invalidates iph ptr) */
1729         err = skb_cow_head(skb, min_headroom);
1730         if (unlikely(err)) {
1731                 kfree_skb(skb);
1732                 goto err;
1733         }
1734 
1735         skb = vlan_hwaccel_push_inside(skb);
1736         if (WARN_ON(!skb)) {
1737                 err = -ENOMEM;
1738                 goto err;
1739         }
1740 
1741         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1742         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1743         vxh->vx_vni = md->vni;
1744 
1745         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1746                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1747                            VXLAN_RCO_SHIFT;
1748 
1749                 if (skb->csum_offset == offsetof(struct udphdr, check))
1750                         data |= VXLAN_RCO_UDP;
1751 
1752                 vxh->vx_vni |= htonl(data);
1753                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1754 
1755                 if (!skb_is_gso(skb)) {
1756                         skb->ip_summed = CHECKSUM_NONE;
1757                         skb->encapsulation = 0;
1758                 }
1759         }
1760 
1761         if (vxflags & VXLAN_F_GBP)
1762                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1763 
1764         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1765 
1766         udp_tunnel6_xmit_skb(dst, skb, dev, saddr, daddr, prio,
1767                              ttl, src_port, dst_port,
1768                              !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1769         return 0;
1770 err:
1771         dst_release(dst);
1772         return err;
1773 }
1774 #endif
1775 
1776 int vxlan_xmit_skb(struct rtable *rt, struct sk_buff *skb,
1777                    __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1778                    __be16 src_port, __be16 dst_port,
1779                    struct vxlan_metadata *md, bool xnet, u32 vxflags)
1780 {
1781         struct vxlanhdr *vxh;
1782         int min_headroom;
1783         int err;
1784         bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1785         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1786         u16 hdrlen = sizeof(struct vxlanhdr);
1787 
1788         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1789             skb->ip_summed == CHECKSUM_PARTIAL) {
1790                 int csum_start = skb_checksum_start_offset(skb);
1791 
1792                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1793                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1794                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1795                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1796                         udp_sum = false;
1797                         type |= SKB_GSO_TUNNEL_REMCSUM;
1798                 }
1799         }
1800 
1801         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1802         if (IS_ERR(skb))
1803                 return PTR_ERR(skb);
1804 
1805         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1806                         + VXLAN_HLEN + sizeof(struct iphdr)
1807                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1808 
1809         /* Need space for new headers (invalidates iph ptr) */
1810         err = skb_cow_head(skb, min_headroom);
1811         if (unlikely(err)) {
1812                 kfree_skb(skb);
1813                 return err;
1814         }
1815 
1816         skb = vlan_hwaccel_push_inside(skb);
1817         if (WARN_ON(!skb))
1818                 return -ENOMEM;
1819 
1820         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1821         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1822         vxh->vx_vni = md->vni;
1823 
1824         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1825                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1826                            VXLAN_RCO_SHIFT;
1827 
1828                 if (skb->csum_offset == offsetof(struct udphdr, check))
1829                         data |= VXLAN_RCO_UDP;
1830 
1831                 vxh->vx_vni |= htonl(data);
1832                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1833 
1834                 if (!skb_is_gso(skb)) {
1835                         skb->ip_summed = CHECKSUM_NONE;
1836                         skb->encapsulation = 0;
1837                 }
1838         }
1839 
1840         if (vxflags & VXLAN_F_GBP)
1841                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1842 
1843         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1844 
1845         return udp_tunnel_xmit_skb(rt, skb, src, dst, tos,
1846                                    ttl, df, src_port, dst_port, xnet,
1847                                    !(vxflags & VXLAN_F_UDP_CSUM));
1848 }
1849 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1850 
1851 /* Bypass encapsulation if the destination is local */
1852 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1853                                struct vxlan_dev *dst_vxlan)
1854 {
1855         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1856         union vxlan_addr loopback;
1857         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1858         struct net_device *dev = skb->dev;
1859         int len = skb->len;
1860 
1861         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1862         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1863         skb->pkt_type = PACKET_HOST;
1864         skb->encapsulation = 0;
1865         skb->dev = dst_vxlan->dev;
1866         __skb_pull(skb, skb_network_offset(skb));
1867 
1868         if (remote_ip->sa.sa_family == AF_INET) {
1869                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1870                 loopback.sa.sa_family =  AF_INET;
1871 #if IS_ENABLED(CONFIG_IPV6)
1872         } else {
1873                 loopback.sin6.sin6_addr = in6addr_loopback;
1874                 loopback.sa.sa_family =  AF_INET6;
1875 #endif
1876         }
1877 
1878         if (dst_vxlan->flags & VXLAN_F_LEARN)
1879                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1880 
1881         u64_stats_update_begin(&tx_stats->syncp);
1882         tx_stats->tx_packets++;
1883         tx_stats->tx_bytes += len;
1884         u64_stats_update_end(&tx_stats->syncp);
1885 
1886         if (netif_rx(skb) == NET_RX_SUCCESS) {
1887                 u64_stats_update_begin(&rx_stats->syncp);
1888                 rx_stats->rx_packets++;
1889                 rx_stats->rx_bytes += len;
1890                 u64_stats_update_end(&rx_stats->syncp);
1891         } else {
1892                 dev->stats.rx_dropped++;
1893         }
1894 }
1895 
1896 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1897                            struct vxlan_rdst *rdst, bool did_rsc)
1898 {
1899         struct vxlan_dev *vxlan = netdev_priv(dev);
1900         struct rtable *rt = NULL;
1901         const struct iphdr *old_iph;
1902         struct flowi4 fl4;
1903         union vxlan_addr *dst;
1904         struct vxlan_metadata md;
1905         __be16 src_port = 0, dst_port;
1906         u32 vni;
1907         __be16 df = 0;
1908         __u8 tos, ttl;
1909         int err;
1910 
1911         dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1912         vni = rdst->remote_vni;
1913         dst = &rdst->remote_ip;
1914 
1915         if (vxlan_addr_any(dst)) {
1916                 if (did_rsc) {
1917                         /* short-circuited back to local bridge */
1918                         vxlan_encap_bypass(skb, vxlan, vxlan);
1919                         return;
1920                 }
1921                 goto drop;
1922         }
1923 
1924         old_iph = ip_hdr(skb);
1925 
1926         ttl = vxlan->ttl;
1927         if (!ttl && vxlan_addr_multicast(dst))
1928                 ttl = 1;
1929 
1930         tos = vxlan->tos;
1931         if (tos == 1)
1932                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1933 
1934         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1935                                      vxlan->port_max, true);
1936 
1937         if (dst->sa.sa_family == AF_INET) {
1938                 memset(&fl4, 0, sizeof(fl4));
1939                 fl4.flowi4_oif = rdst->remote_ifindex;
1940                 fl4.flowi4_tos = RT_TOS(tos);
1941                 fl4.daddr = dst->sin.sin_addr.s_addr;
1942                 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1943 
1944                 rt = ip_route_output_key(vxlan->net, &fl4);
1945                 if (IS_ERR(rt)) {
1946                         netdev_dbg(dev, "no route to %pI4\n",
1947                                    &dst->sin.sin_addr.s_addr);
1948                         dev->stats.tx_carrier_errors++;
1949                         goto tx_error;
1950                 }
1951 
1952                 if (rt->dst.dev == dev) {
1953                         netdev_dbg(dev, "circular route to %pI4\n",
1954                                    &dst->sin.sin_addr.s_addr);
1955                         dev->stats.collisions++;
1956                         goto rt_tx_error;
1957                 }
1958 
1959                 /* Bypass encapsulation if the destination is local */
1960                 if (rt->rt_flags & RTCF_LOCAL &&
1961                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1962                         struct vxlan_dev *dst_vxlan;
1963 
1964                         ip_rt_put(rt);
1965                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1966                                                    dst->sa.sa_family, dst_port,
1967                                                    vxlan->flags);
1968                         if (!dst_vxlan)
1969                                 goto tx_error;
1970                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1971                         return;
1972                 }
1973 
1974                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1975                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1976                 md.vni = htonl(vni << 8);
1977                 md.gbp = skb->mark;
1978 
1979                 err = vxlan_xmit_skb(rt, skb, fl4.saddr,
1980                                      dst->sin.sin_addr.s_addr, tos, ttl, df,
1981                                      src_port, dst_port, &md,
1982                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
1983                                      vxlan->flags);
1984                 if (err < 0) {
1985                         /* skb is already freed. */
1986                         skb = NULL;
1987                         goto rt_tx_error;
1988                 }
1989 
1990                 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1991 #if IS_ENABLED(CONFIG_IPV6)
1992         } else {
1993                 struct sock *sk = vxlan->vn_sock->sock->sk;
1994                 struct dst_entry *ndst;
1995                 struct flowi6 fl6;
1996                 u32 flags;
1997 
1998                 memset(&fl6, 0, sizeof(fl6));
1999                 fl6.flowi6_oif = rdst->remote_ifindex;
2000                 fl6.daddr = dst->sin6.sin6_addr;
2001                 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
2002                 fl6.flowi6_proto = IPPROTO_UDP;
2003 
2004                 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
2005                         netdev_dbg(dev, "no route to %pI6\n",
2006                                    &dst->sin6.sin6_addr);
2007                         dev->stats.tx_carrier_errors++;
2008                         goto tx_error;
2009                 }
2010 
2011                 if (ndst->dev == dev) {
2012                         netdev_dbg(dev, "circular route to %pI6\n",
2013                                    &dst->sin6.sin6_addr);
2014                         dst_release(ndst);
2015                         dev->stats.collisions++;
2016                         goto tx_error;
2017                 }
2018 
2019                 /* Bypass encapsulation if the destination is local */
2020                 flags = ((struct rt6_info *)ndst)->rt6i_flags;
2021                 if (flags & RTF_LOCAL &&
2022                     !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2023                         struct vxlan_dev *dst_vxlan;
2024 
2025                         dst_release(ndst);
2026                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2027                                                    dst->sa.sa_family, dst_port,
2028                                                    vxlan->flags);
2029                         if (!dst_vxlan)
2030                                 goto tx_error;
2031                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2032                         return;
2033                 }
2034 
2035                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2036                 md.vni = htonl(vni << 8);
2037                 md.gbp = skb->mark;
2038 
2039                 err = vxlan6_xmit_skb(ndst, skb, dev, &fl6.saddr, &fl6.daddr,
2040                                       0, ttl, src_port, dst_port, &md,
2041                                       !net_eq(vxlan->net, dev_net(vxlan->dev)),
2042                                       vxlan->flags);
2043 #endif
2044         }
2045 
2046         return;
2047 
2048 drop:
2049         dev->stats.tx_dropped++;
2050         goto tx_free;
2051 
2052 rt_tx_error:
2053         ip_rt_put(rt);
2054 tx_error:
2055         dev->stats.tx_errors++;
2056 tx_free:
2057         dev_kfree_skb(skb);
2058 }
2059 
2060 /* Transmit local packets over Vxlan
2061  *
2062  * Outer IP header inherits ECN and DF from inner header.
2063  * Outer UDP destination is the VXLAN assigned port.
2064  *           source port is based on hash of flow
2065  */
2066 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2067 {
2068         struct vxlan_dev *vxlan = netdev_priv(dev);
2069         struct ethhdr *eth;
2070         bool did_rsc = false;
2071         struct vxlan_rdst *rdst, *fdst = NULL;
2072         struct vxlan_fdb *f;
2073 
2074         skb_reset_mac_header(skb);
2075         eth = eth_hdr(skb);
2076 
2077         if ((vxlan->flags & VXLAN_F_PROXY)) {
2078                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2079                         return arp_reduce(dev, skb);
2080 #if IS_ENABLED(CONFIG_IPV6)
2081                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2082                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2083                                        + sizeof(struct nd_msg)) &&
2084                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2085                                 struct nd_msg *msg;
2086 
2087                                 msg = (struct nd_msg *)skb_transport_header(skb);
2088                                 if (msg->icmph.icmp6_code == 0 &&
2089                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2090                                         return neigh_reduce(dev, skb);
2091                 }
2092                 eth = eth_hdr(skb);
2093 #endif
2094         }
2095 
2096         f = vxlan_find_mac(vxlan, eth->h_dest);
2097         did_rsc = false;
2098 
2099         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2100             (ntohs(eth->h_proto) == ETH_P_IP ||
2101              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2102                 did_rsc = route_shortcircuit(dev, skb);
2103                 if (did_rsc)
2104                         f = vxlan_find_mac(vxlan, eth->h_dest);
2105         }
2106 
2107         if (f == NULL) {
2108                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2109                 if (f == NULL) {
2110                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2111                             !is_multicast_ether_addr(eth->h_dest))
2112                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2113 
2114                         dev->stats.tx_dropped++;
2115                         kfree_skb(skb);
2116                         return NETDEV_TX_OK;
2117                 }
2118         }
2119 
2120         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2121                 struct sk_buff *skb1;
2122 
2123                 if (!fdst) {
2124                         fdst = rdst;
2125                         continue;
2126                 }
2127                 skb1 = skb_clone(skb, GFP_ATOMIC);
2128                 if (skb1)
2129                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2130         }
2131 
2132         if (fdst)
2133                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2134         else
2135                 kfree_skb(skb);
2136         return NETDEV_TX_OK;
2137 }
2138 
2139 /* Walk the forwarding table and purge stale entries */
2140 static void vxlan_cleanup(unsigned long arg)
2141 {
2142         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2143         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2144         unsigned int h;
2145 
2146         if (!netif_running(vxlan->dev))
2147                 return;
2148 
2149         spin_lock_bh(&vxlan->hash_lock);
2150         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2151                 struct hlist_node *p, *n;
2152                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2153                         struct vxlan_fdb *f
2154                                 = container_of(p, struct vxlan_fdb, hlist);
2155                         unsigned long timeout;
2156 
2157                         if (f->state & NUD_PERMANENT)
2158                                 continue;
2159 
2160                         timeout = f->used + vxlan->age_interval * HZ;
2161                         if (time_before_eq(timeout, jiffies)) {
2162                                 netdev_dbg(vxlan->dev,
2163                                            "garbage collect %pM\n",
2164                                            f->eth_addr);
2165                                 f->state = NUD_STALE;
2166                                 vxlan_fdb_destroy(vxlan, f);
2167                         } else if (time_before(timeout, next_timer))
2168                                 next_timer = timeout;
2169                 }
2170         }
2171         spin_unlock_bh(&vxlan->hash_lock);
2172 
2173         mod_timer(&vxlan->age_timer, next_timer);
2174 }
2175 
2176 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2177 {
2178         __u32 vni = vxlan->default_dst.remote_vni;
2179 
2180         vxlan->vn_sock = vs;
2181         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2182 }
2183 
2184 /* Setup stats when device is created */
2185 static int vxlan_init(struct net_device *dev)
2186 {
2187         struct vxlan_dev *vxlan = netdev_priv(dev);
2188         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2189         struct vxlan_sock *vs;
2190         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2191 
2192         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2193         if (!dev->tstats)
2194                 return -ENOMEM;
2195 
2196         spin_lock(&vn->sock_lock);
2197         vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2198                              vxlan->dst_port, vxlan->flags);
2199         if (vs && atomic_add_unless(&vs->refcnt, 1, 0)) {
2200                 /* If we have a socket with same port already, reuse it */
2201                 vxlan_vs_add_dev(vs, vxlan);
2202         } else {
2203                 /* otherwise make new socket outside of RTNL */
2204                 dev_hold(dev);
2205                 queue_work(vxlan_wq, &vxlan->sock_work);
2206         }
2207         spin_unlock(&vn->sock_lock);
2208 
2209         return 0;
2210 }
2211 
2212 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2213 {
2214         struct vxlan_fdb *f;
2215 
2216         spin_lock_bh(&vxlan->hash_lock);
2217         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2218         if (f)
2219                 vxlan_fdb_destroy(vxlan, f);
2220         spin_unlock_bh(&vxlan->hash_lock);
2221 }
2222 
2223 static void vxlan_uninit(struct net_device *dev)
2224 {
2225         struct vxlan_dev *vxlan = netdev_priv(dev);
2226         struct vxlan_sock *vs = vxlan->vn_sock;
2227 
2228         vxlan_fdb_delete_default(vxlan);
2229 
2230         if (vs)
2231                 vxlan_sock_release(vs);
2232         free_percpu(dev->tstats);
2233 }
2234 
2235 /* Start ageing timer and join group when device is brought up */
2236 static int vxlan_open(struct net_device *dev)
2237 {
2238         struct vxlan_dev *vxlan = netdev_priv(dev);
2239         struct vxlan_sock *vs = vxlan->vn_sock;
2240 
2241         /* socket hasn't been created */
2242         if (!vs)
2243                 return -ENOTCONN;
2244 
2245         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2246                 vxlan_sock_hold(vs);
2247                 dev_hold(dev);
2248                 queue_work(vxlan_wq, &vxlan->igmp_join);
2249         }
2250 
2251         if (vxlan->age_interval)
2252                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2253 
2254         return 0;
2255 }
2256 
2257 /* Purge the forwarding table */
2258 static void vxlan_flush(struct vxlan_dev *vxlan)
2259 {
2260         unsigned int h;
2261 
2262         spin_lock_bh(&vxlan->hash_lock);
2263         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2264                 struct hlist_node *p, *n;
2265                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2266                         struct vxlan_fdb *f
2267                                 = container_of(p, struct vxlan_fdb, hlist);
2268                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2269                         if (!is_zero_ether_addr(f->eth_addr))
2270                                 vxlan_fdb_destroy(vxlan, f);
2271                 }
2272         }
2273         spin_unlock_bh(&vxlan->hash_lock);
2274 }
2275 
2276 /* Cleanup timer and forwarding table on shutdown */
2277 static int vxlan_stop(struct net_device *dev)
2278 {
2279         struct vxlan_dev *vxlan = netdev_priv(dev);
2280         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2281         struct vxlan_sock *vs = vxlan->vn_sock;
2282 
2283         if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2284             !vxlan_group_used(vn, vxlan)) {
2285                 vxlan_sock_hold(vs);
2286                 dev_hold(dev);
2287                 queue_work(vxlan_wq, &vxlan->igmp_leave);
2288         }
2289 
2290         del_timer_sync(&vxlan->age_timer);
2291 
2292         vxlan_flush(vxlan);
2293 
2294         return 0;
2295 }
2296 
2297 /* Stub, nothing needs to be done. */
2298 static void vxlan_set_multicast_list(struct net_device *dev)
2299 {
2300 }
2301 
2302 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2303 {
2304         struct vxlan_dev *vxlan = netdev_priv(dev);
2305         struct vxlan_rdst *dst = &vxlan->default_dst;
2306         struct net_device *lowerdev;
2307         int max_mtu;
2308 
2309         lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2310         if (lowerdev == NULL)
2311                 return eth_change_mtu(dev, new_mtu);
2312 
2313         if (dst->remote_ip.sa.sa_family == AF_INET6)
2314                 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2315         else
2316                 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2317 
2318         if (new_mtu < 68 || new_mtu > max_mtu)
2319                 return -EINVAL;
2320 
2321         dev->mtu = new_mtu;
2322         return 0;
2323 }
2324 
2325 static const struct net_device_ops vxlan_netdev_ops = {
2326         .ndo_init               = vxlan_init,
2327         .ndo_uninit             = vxlan_uninit,
2328         .ndo_open               = vxlan_open,
2329         .ndo_stop               = vxlan_stop,
2330         .ndo_start_xmit         = vxlan_xmit,
2331         .ndo_get_stats64        = ip_tunnel_get_stats64,
2332         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2333         .ndo_change_mtu         = vxlan_change_mtu,
2334         .ndo_validate_addr      = eth_validate_addr,
2335         .ndo_set_mac_address    = eth_mac_addr,
2336         .ndo_fdb_add            = vxlan_fdb_add,
2337         .ndo_fdb_del            = vxlan_fdb_delete,
2338         .ndo_fdb_dump           = vxlan_fdb_dump,
2339 };
2340 
2341 /* Info for udev, that this is a virtual tunnel endpoint */
2342 static struct device_type vxlan_type = {
2343         .name = "vxlan",
2344 };
2345 
2346 /* Calls the ndo_add_vxlan_port of the caller in order to
2347  * supply the listening VXLAN udp ports. Callers are expected
2348  * to implement the ndo_add_vxlan_port.
2349  */
2350 void vxlan_get_rx_port(struct net_device *dev)
2351 {
2352         struct vxlan_sock *vs;
2353         struct net *net = dev_net(dev);
2354         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2355         sa_family_t sa_family;
2356         __be16 port;
2357         unsigned int i;
2358 
2359         spin_lock(&vn->sock_lock);
2360         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2361                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2362                         port = inet_sk(vs->sock->sk)->inet_sport;
2363                         sa_family = vs->sock->sk->sk_family;
2364                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2365                                                             port);
2366                 }
2367         }
2368         spin_unlock(&vn->sock_lock);
2369 }
2370 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2371 
2372 /* Initialize the device structure. */
2373 static void vxlan_setup(struct net_device *dev)
2374 {
2375         struct vxlan_dev *vxlan = netdev_priv(dev);
2376         unsigned int h;
2377 
2378         eth_hw_addr_random(dev);
2379         ether_setup(dev);
2380         if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2381                 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2382         else
2383                 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2384 
2385         dev->netdev_ops = &vxlan_netdev_ops;
2386         dev->destructor = free_netdev;
2387         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2388 
2389         dev->tx_queue_len = 0;
2390         dev->features   |= NETIF_F_LLTX;
2391         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2392         dev->features   |= NETIF_F_RXCSUM;
2393         dev->features   |= NETIF_F_GSO_SOFTWARE;
2394 
2395         dev->vlan_features = dev->features;
2396         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2397         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2398         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2399         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2400         netif_keep_dst(dev);
2401         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2402 
2403         INIT_LIST_HEAD(&vxlan->next);
2404         spin_lock_init(&vxlan->hash_lock);
2405         INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2406         INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2407         INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2408 
2409         init_timer_deferrable(&vxlan->age_timer);
2410         vxlan->age_timer.function = vxlan_cleanup;
2411         vxlan->age_timer.data = (unsigned long) vxlan;
2412 
2413         vxlan->dst_port = htons(vxlan_port);
2414 
2415         vxlan->dev = dev;
2416 
2417         for (h = 0; h < FDB_HASH_SIZE; ++h)
2418                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2419 }
2420 
2421 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2422         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2423         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2424         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2425         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2426         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2427         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2428         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2429         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2430         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2431         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2432         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2433         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2434         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2435         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2436         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2437         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2438         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2439         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2440         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2441         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2442         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2443         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2444         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2445         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2446 };
2447 
2448 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2449 {
2450         if (tb[IFLA_ADDRESS]) {
2451                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2452                         pr_debug("invalid link address (not ethernet)\n");
2453                         return -EINVAL;
2454                 }
2455 
2456                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2457                         pr_debug("invalid all zero ethernet address\n");
2458                         return -EADDRNOTAVAIL;
2459                 }
2460         }
2461 
2462         if (!data)
2463                 return -EINVAL;
2464 
2465         if (data[IFLA_VXLAN_ID]) {
2466                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2467                 if (id >= VXLAN_VID_MASK)
2468                         return -ERANGE;
2469         }
2470 
2471         if (data[IFLA_VXLAN_PORT_RANGE]) {
2472                 const struct ifla_vxlan_port_range *p
2473                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2474 
2475                 if (ntohs(p->high) < ntohs(p->low)) {
2476                         pr_debug("port range %u .. %u not valid\n",
2477                                  ntohs(p->low), ntohs(p->high));
2478                         return -EINVAL;
2479                 }
2480         }
2481 
2482         return 0;
2483 }
2484 
2485 static void vxlan_get_drvinfo(struct net_device *netdev,
2486                               struct ethtool_drvinfo *drvinfo)
2487 {
2488         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2489         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2490 }
2491 
2492 static const struct ethtool_ops vxlan_ethtool_ops = {
2493         .get_drvinfo    = vxlan_get_drvinfo,
2494         .get_link       = ethtool_op_get_link,
2495 };
2496 
2497 static void vxlan_del_work(struct work_struct *work)
2498 {
2499         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2500         udp_tunnel_sock_release(vs->sock);
2501         kfree_rcu(vs, rcu);
2502 }
2503 
2504 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2505                                         __be16 port, u32 flags)
2506 {
2507         struct socket *sock;
2508         struct udp_port_cfg udp_conf;
2509         int err;
2510 
2511         memset(&udp_conf, 0, sizeof(udp_conf));
2512 
2513         if (ipv6) {
2514                 udp_conf.family = AF_INET6;
2515                 udp_conf.use_udp6_rx_checksums =
2516                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2517         } else {
2518                 udp_conf.family = AF_INET;
2519                 udp_conf.local_ip.s_addr = INADDR_ANY;
2520         }
2521 
2522         udp_conf.local_udp_port = port;
2523 
2524         /* Open UDP socket */
2525         err = udp_sock_create(net, &udp_conf, &sock);
2526         if (err < 0)
2527                 return ERR_PTR(err);
2528 
2529         return sock;
2530 }
2531 
2532 /* Create new listen socket if needed */
2533 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2534                                               vxlan_rcv_t *rcv, void *data,
2535                                               u32 flags)
2536 {
2537         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2538         struct vxlan_sock *vs;
2539         struct socket *sock;
2540         unsigned int h;
2541         bool ipv6 = !!(flags & VXLAN_F_IPV6);
2542         struct udp_tunnel_sock_cfg tunnel_cfg;
2543 
2544         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2545         if (!vs)
2546                 return ERR_PTR(-ENOMEM);
2547 
2548         for (h = 0; h < VNI_HASH_SIZE; ++h)
2549                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2550 
2551         INIT_WORK(&vs->del_work, vxlan_del_work);
2552 
2553         sock = vxlan_create_sock(net, ipv6, port, flags);
2554         if (IS_ERR(sock)) {
2555                 kfree(vs);
2556                 return ERR_CAST(sock);
2557         }
2558 
2559         vs->sock = sock;
2560         atomic_set(&vs->refcnt, 1);
2561         vs->rcv = rcv;
2562         vs->data = data;
2563         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2564 
2565         /* Initialize the vxlan udp offloads structure */
2566         vs->udp_offloads.port = port;
2567         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2568         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2569 
2570         spin_lock(&vn->sock_lock);
2571         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2572         vxlan_notify_add_rx_port(vs);
2573         spin_unlock(&vn->sock_lock);
2574 
2575         /* Mark socket as an encapsulation socket. */
2576         tunnel_cfg.sk_user_data = vs;
2577         tunnel_cfg.encap_type = 1;
2578         tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2579         tunnel_cfg.encap_destroy = NULL;
2580 
2581         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2582 
2583         return vs;
2584 }
2585 
2586 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2587                                   vxlan_rcv_t *rcv, void *data,
2588                                   bool no_share, u32 flags)
2589 {
2590         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2591         struct vxlan_sock *vs;
2592         bool ipv6 = flags & VXLAN_F_IPV6;
2593 
2594         vs = vxlan_socket_create(net, port, rcv, data, flags);
2595         if (!IS_ERR(vs))
2596                 return vs;
2597 
2598         if (no_share)   /* Return error if sharing is not allowed. */
2599                 return vs;
2600 
2601         spin_lock(&vn->sock_lock);
2602         vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port, flags);
2603         if (vs && ((vs->rcv != rcv) ||
2604                    !atomic_add_unless(&vs->refcnt, 1, 0)))
2605                         vs = ERR_PTR(-EBUSY);
2606         spin_unlock(&vn->sock_lock);
2607 
2608         if (!vs)
2609                 vs = ERR_PTR(-EINVAL);
2610 
2611         return vs;
2612 }
2613 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2614 
2615 /* Scheduled at device creation to bind to a socket */
2616 static void vxlan_sock_work(struct work_struct *work)
2617 {
2618         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2619         struct net *net = vxlan->net;
2620         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2621         __be16 port = vxlan->dst_port;
2622         struct vxlan_sock *nvs;
2623 
2624         nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
2625         spin_lock(&vn->sock_lock);
2626         if (!IS_ERR(nvs))
2627                 vxlan_vs_add_dev(nvs, vxlan);
2628         spin_unlock(&vn->sock_lock);
2629 
2630         dev_put(vxlan->dev);
2631 }
2632 
2633 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2634                          struct nlattr *tb[], struct nlattr *data[])
2635 {
2636         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2637         struct vxlan_dev *vxlan = netdev_priv(dev);
2638         struct vxlan_rdst *dst = &vxlan->default_dst;
2639         __u32 vni;
2640         int err;
2641         bool use_ipv6 = false;
2642 
2643         if (!data[IFLA_VXLAN_ID])
2644                 return -EINVAL;
2645 
2646         vxlan->net = src_net;
2647 
2648         vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2649         dst->remote_vni = vni;
2650 
2651         /* Unless IPv6 is explicitly requested, assume IPv4 */
2652         dst->remote_ip.sa.sa_family = AF_INET;
2653         if (data[IFLA_VXLAN_GROUP]) {
2654                 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2655         } else if (data[IFLA_VXLAN_GROUP6]) {
2656                 if (!IS_ENABLED(CONFIG_IPV6))
2657                         return -EPFNOSUPPORT;
2658 
2659                 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2660                            sizeof(struct in6_addr));
2661                 dst->remote_ip.sa.sa_family = AF_INET6;
2662                 use_ipv6 = true;
2663         }
2664 
2665         if (data[IFLA_VXLAN_LOCAL]) {
2666                 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2667                 vxlan->saddr.sa.sa_family = AF_INET;
2668         } else if (data[IFLA_VXLAN_LOCAL6]) {
2669                 if (!IS_ENABLED(CONFIG_IPV6))
2670                         return -EPFNOSUPPORT;
2671 
2672                 /* TODO: respect scope id */
2673                 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2674                            sizeof(struct in6_addr));
2675                 vxlan->saddr.sa.sa_family = AF_INET6;
2676                 use_ipv6 = true;
2677         }
2678 
2679         if (data[IFLA_VXLAN_LINK] &&
2680             (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2681                 struct net_device *lowerdev
2682                          = __dev_get_by_index(src_net, dst->remote_ifindex);
2683 
2684                 if (!lowerdev) {
2685                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2686                         return -ENODEV;
2687                 }
2688 
2689 #if IS_ENABLED(CONFIG_IPV6)
2690                 if (use_ipv6) {
2691                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2692                         if (idev && idev->cnf.disable_ipv6) {
2693                                 pr_info("IPv6 is disabled via sysctl\n");
2694                                 return -EPERM;
2695                         }
2696                         vxlan->flags |= VXLAN_F_IPV6;
2697                 }
2698 #endif
2699 
2700                 if (!tb[IFLA_MTU])
2701                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2702 
2703                 dev->needed_headroom = lowerdev->hard_header_len +
2704                                        (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2705         } else if (use_ipv6)
2706                 vxlan->flags |= VXLAN_F_IPV6;
2707 
2708         if (data[IFLA_VXLAN_TOS])
2709                 vxlan->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2710 
2711         if (data[IFLA_VXLAN_TTL])
2712                 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2713 
2714         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2715                 vxlan->flags |= VXLAN_F_LEARN;
2716 
2717         if (data[IFLA_VXLAN_AGEING])
2718                 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2719         else
2720                 vxlan->age_interval = FDB_AGE_DEFAULT;
2721 
2722         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2723                 vxlan->flags |= VXLAN_F_PROXY;
2724 
2725         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2726                 vxlan->flags |= VXLAN_F_RSC;
2727 
2728         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2729                 vxlan->flags |= VXLAN_F_L2MISS;
2730 
2731         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2732                 vxlan->flags |= VXLAN_F_L3MISS;
2733 
2734         if (data[IFLA_VXLAN_LIMIT])
2735                 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2736 
2737         if (data[IFLA_VXLAN_PORT_RANGE]) {
2738                 const struct ifla_vxlan_port_range *p
2739                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2740                 vxlan->port_min = ntohs(p->low);
2741                 vxlan->port_max = ntohs(p->high);
2742         }
2743 
2744         if (data[IFLA_VXLAN_PORT])
2745                 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2746 
2747         if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2748                 vxlan->flags |= VXLAN_F_UDP_CSUM;
2749 
2750         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2751             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2752                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2753 
2754         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2755             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2756                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2757 
2758         if (data[IFLA_VXLAN_REMCSUM_TX] &&
2759             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2760                 vxlan->flags |= VXLAN_F_REMCSUM_TX;
2761 
2762         if (data[IFLA_VXLAN_REMCSUM_RX] &&
2763             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2764                 vxlan->flags |= VXLAN_F_REMCSUM_RX;
2765 
2766         if (data[IFLA_VXLAN_GBP])
2767                 vxlan->flags |= VXLAN_F_GBP;
2768 
2769         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2770                 vxlan->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2771 
2772         if (vxlan_find_vni(src_net, vni, use_ipv6 ? AF_INET6 : AF_INET,
2773                            vxlan->dst_port, vxlan->flags)) {
2774                 pr_info("duplicate VNI %u\n", vni);
2775                 return -EEXIST;
2776         }
2777 
2778         dev->ethtool_ops = &vxlan_ethtool_ops;
2779 
2780         /* create an fdb entry for a valid default destination */
2781         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2782                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2783                                        &vxlan->default_dst.remote_ip,
2784                                        NUD_REACHABLE|NUD_PERMANENT,
2785                                        NLM_F_EXCL|NLM_F_CREATE,
2786                                        vxlan->dst_port,
2787                                        vxlan->default_dst.remote_vni,
2788                                        vxlan->default_dst.remote_ifindex,
2789                                        NTF_SELF);
2790                 if (err)
2791                         return err;
2792         }
2793 
2794         err = register_netdevice(dev);
2795         if (err) {
2796                 vxlan_fdb_delete_default(vxlan);
2797                 return err;
2798         }
2799 
2800         list_add(&vxlan->next, &vn->vxlan_list);
2801 
2802         return 0;
2803 }
2804 
2805 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2806 {
2807         struct vxlan_dev *vxlan = netdev_priv(dev);
2808         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2809 
2810         spin_lock(&vn->sock_lock);
2811         if (!hlist_unhashed(&vxlan->hlist))
2812                 hlist_del_rcu(&vxlan->hlist);
2813         spin_unlock(&vn->sock_lock);
2814 
2815         list_del(&vxlan->next);
2816         unregister_netdevice_queue(dev, head);
2817 }
2818 
2819 static size_t vxlan_get_size(const struct net_device *dev)
2820 {
2821 
2822         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
2823                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2824                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2825                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2826                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
2827                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
2828                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
2829                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
2830                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
2831                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
2832                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
2833                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2834                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2835                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2836                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2837                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2838                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2839                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2840                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2841                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2842                 0;
2843 }
2844 
2845 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2846 {
2847         const struct vxlan_dev *vxlan = netdev_priv(dev);
2848         const struct vxlan_rdst *dst = &vxlan->default_dst;
2849         struct ifla_vxlan_port_range ports = {
2850                 .low =  htons(vxlan->port_min),
2851                 .high = htons(vxlan->port_max),
2852         };
2853 
2854         if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2855                 goto nla_put_failure;
2856 
2857         if (!vxlan_addr_any(&dst->remote_ip)) {
2858                 if (dst->remote_ip.sa.sa_family == AF_INET) {
2859                         if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2860                                          dst->remote_ip.sin.sin_addr.s_addr))
2861                                 goto nla_put_failure;
2862 #if IS_ENABLED(CONFIG_IPV6)
2863                 } else {
2864                         if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2865                                     &dst->remote_ip.sin6.sin6_addr))
2866                                 goto nla_put_failure;
2867 #endif
2868                 }
2869         }
2870 
2871         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2872                 goto nla_put_failure;
2873 
2874         if (!vxlan_addr_any(&vxlan->saddr)) {
2875                 if (vxlan->saddr.sa.sa_family == AF_INET) {
2876                         if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2877                                          vxlan->saddr.sin.sin_addr.s_addr))
2878                                 goto nla_put_failure;
2879 #if IS_ENABLED(CONFIG_IPV6)
2880                 } else {
2881                         if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2882                                     &vxlan->saddr.sin6.sin6_addr))
2883                                 goto nla_put_failure;
2884 #endif
2885                 }
2886         }
2887 
2888         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2889             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2890             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2891                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
2892             nla_put_u8(skb, IFLA_VXLAN_PROXY,
2893                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
2894             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2895             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2896                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2897             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2898                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2899             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2900             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2901             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2902             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2903                         !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2904             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2905                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2906             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2907                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
2908             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
2909                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
2910             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
2911                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
2912                 goto nla_put_failure;
2913 
2914         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2915                 goto nla_put_failure;
2916 
2917         if (vxlan->flags & VXLAN_F_GBP &&
2918             nla_put_flag(skb, IFLA_VXLAN_GBP))
2919                 goto nla_put_failure;
2920 
2921         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
2922             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
2923                 goto nla_put_failure;
2924 
2925         return 0;
2926 
2927 nla_put_failure:
2928         return -EMSGSIZE;
2929 }
2930 
2931 static struct net *vxlan_get_link_net(const struct net_device *dev)
2932 {
2933         struct vxlan_dev *vxlan = netdev_priv(dev);
2934 
2935         return vxlan->net;
2936 }
2937 
2938 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2939         .kind           = "vxlan",
2940         .maxtype        = IFLA_VXLAN_MAX,
2941         .policy         = vxlan_policy,
2942         .priv_size      = sizeof(struct vxlan_dev),
2943         .setup          = vxlan_setup,
2944         .validate       = vxlan_validate,
2945         .newlink        = vxlan_newlink,
2946         .dellink        = vxlan_dellink,
2947         .get_size       = vxlan_get_size,
2948         .fill_info      = vxlan_fill_info,
2949         .get_link_net   = vxlan_get_link_net,
2950 };
2951 
2952 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2953                                              struct net_device *dev)
2954 {
2955         struct vxlan_dev *vxlan, *next;
2956         LIST_HEAD(list_kill);
2957 
2958         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2959                 struct vxlan_rdst *dst = &vxlan->default_dst;
2960 
2961                 /* In case we created vxlan device with carrier
2962                  * and we loose the carrier due to module unload
2963                  * we also need to remove vxlan device. In other
2964                  * cases, it's not necessary and remote_ifindex
2965                  * is 0 here, so no matches.
2966                  */
2967                 if (dst->remote_ifindex == dev->ifindex)
2968                         vxlan_dellink(vxlan->dev, &list_kill);
2969         }
2970 
2971         unregister_netdevice_many(&list_kill);
2972 }
2973 
2974 static int vxlan_lowerdev_event(struct notifier_block *unused,
2975                                 unsigned long event, void *ptr)
2976 {
2977         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2978         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2979 
2980         if (event == NETDEV_UNREGISTER)
2981                 vxlan_handle_lowerdev_unregister(vn, dev);
2982 
2983         return NOTIFY_DONE;
2984 }
2985 
2986 static struct notifier_block vxlan_notifier_block __read_mostly = {
2987         .notifier_call = vxlan_lowerdev_event,
2988 };
2989 
2990 static __net_init int vxlan_init_net(struct net *net)
2991 {
2992         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2993         unsigned int h;
2994 
2995         INIT_LIST_HEAD(&vn->vxlan_list);
2996         spin_lock_init(&vn->sock_lock);
2997 
2998         for (h = 0; h < PORT_HASH_SIZE; ++h)
2999                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3000 
3001         return 0;
3002 }
3003 
3004 static void __net_exit vxlan_exit_net(struct net *net)
3005 {
3006         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3007         struct vxlan_dev *vxlan, *next;
3008         struct net_device *dev, *aux;
3009         LIST_HEAD(list);
3010 
3011         rtnl_lock();
3012         for_each_netdev_safe(net, dev, aux)
3013                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3014                         unregister_netdevice_queue(dev, &list);
3015 
3016         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3017                 /* If vxlan->dev is in the same netns, it has already been added
3018                  * to the list by the previous loop.
3019                  */
3020                 if (!net_eq(dev_net(vxlan->dev), net))
3021                         unregister_netdevice_queue(dev, &list);
3022         }
3023 
3024         unregister_netdevice_many(&list);
3025         rtnl_unlock();
3026 }
3027 
3028 static struct pernet_operations vxlan_net_ops = {
3029         .init = vxlan_init_net,
3030         .exit = vxlan_exit_net,
3031         .id   = &vxlan_net_id,
3032         .size = sizeof(struct vxlan_net),
3033 };
3034 
3035 static int __init vxlan_init_module(void)
3036 {
3037         int rc;
3038 
3039         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3040         if (!vxlan_wq)
3041                 return -ENOMEM;
3042 
3043         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3044 
3045         rc = register_pernet_subsys(&vxlan_net_ops);
3046         if (rc)
3047                 goto out1;
3048 
3049         rc = register_netdevice_notifier(&vxlan_notifier_block);
3050         if (rc)
3051                 goto out2;
3052 
3053         rc = rtnl_link_register(&vxlan_link_ops);
3054         if (rc)
3055                 goto out3;
3056 
3057         return 0;
3058 out3:
3059         unregister_netdevice_notifier(&vxlan_notifier_block);
3060 out2:
3061         unregister_pernet_subsys(&vxlan_net_ops);
3062 out1:
3063         destroy_workqueue(vxlan_wq);
3064         return rc;
3065 }
3066 late_initcall(vxlan_init_module);
3067 
3068 static void __exit vxlan_cleanup_module(void)
3069 {
3070         rtnl_link_unregister(&vxlan_link_ops);
3071         unregister_netdevice_notifier(&vxlan_notifier_block);
3072         destroy_workqueue(vxlan_wq);
3073         unregister_pernet_subsys(&vxlan_net_ops);
3074         /* rcu_barrier() is called by netns */
3075 }
3076 module_exit(vxlan_cleanup_module);
3077 
3078 MODULE_LICENSE("GPL");
3079 MODULE_VERSION(VXLAN_VERSION);
3080 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3081 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3082 MODULE_ALIAS_RTNL_LINK("vxlan");
3083 

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