Version:  2.0.40 2.2.26 2.4.37 3.3 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

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 #define VXLAN_N_VID     (1u << 24)
 65 #define VXLAN_VID_MASK  (VXLAN_N_VID - 1)
 66 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
 67 
 68 #define VXLAN_FLAGS 0x08000000  /* struct vxlanhdr.vx_flags required value. */
 69 
 70 /* UDP port for VXLAN traffic.
 71  * The IANA assigned port is 4789, but the Linux default is 8472
 72  * for compatibility with early adopters.
 73  */
 74 static unsigned short vxlan_port __read_mostly = 8472;
 75 module_param_named(udp_port, vxlan_port, ushort, 0444);
 76 MODULE_PARM_DESC(udp_port, "Destination UDP port");
 77 
 78 static bool log_ecn_error = true;
 79 module_param(log_ecn_error, bool, 0644);
 80 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
 81 
 82 static int vxlan_net_id;
 83 
 84 static const u8 all_zeros_mac[ETH_ALEN];
 85 
 86 /* per-network namespace private data for this module */
 87 struct vxlan_net {
 88         struct list_head  vxlan_list;
 89         struct hlist_head sock_list[PORT_HASH_SIZE];
 90         spinlock_t        sock_lock;
 91 };
 92 
 93 union vxlan_addr {
 94         struct sockaddr_in sin;
 95         struct sockaddr_in6 sin6;
 96         struct sockaddr sa;
 97 };
 98 
 99 struct vxlan_rdst {
100         union vxlan_addr         remote_ip;
101         __be16                   remote_port;
102         u32                      remote_vni;
103         u32                      remote_ifindex;
104         struct list_head         list;
105         struct rcu_head          rcu;
106 };
107 
108 /* Forwarding table entry */
109 struct vxlan_fdb {
110         struct hlist_node hlist;        /* linked list of entries */
111         struct rcu_head   rcu;
112         unsigned long     updated;      /* jiffies */
113         unsigned long     used;
114         struct list_head  remotes;
115         u16               state;        /* see ndm_state */
116         u8                flags;        /* see ndm_flags */
117         u8                eth_addr[ETH_ALEN];
118 };
119 
120 /* Pseudo network device */
121 struct vxlan_dev {
122         struct hlist_node hlist;        /* vni hash table */
123         struct list_head  next;         /* vxlan's per namespace list */
124         struct vxlan_sock *vn_sock;     /* listening socket */
125         struct net_device *dev;
126         struct net        *net;         /* netns for packet i/o */
127         struct vxlan_rdst default_dst;  /* default destination */
128         union vxlan_addr  saddr;        /* source address */
129         __be16            dst_port;
130         __u16             port_min;     /* source port range */
131         __u16             port_max;
132         __u8              tos;          /* TOS override */
133         __u8              ttl;
134         u32               flags;        /* VXLAN_F_* in vxlan.h */
135 
136         struct work_struct sock_work;
137         struct work_struct igmp_join;
138         struct work_struct igmp_leave;
139 
140         unsigned long     age_interval;
141         struct timer_list age_timer;
142         spinlock_t        hash_lock;
143         unsigned int      addrcnt;
144         unsigned int      addrmax;
145 
146         struct hlist_head fdb_head[FDB_HASH_SIZE];
147 };
148 
149 /* salt for hash table */
150 static u32 vxlan_salt __read_mostly;
151 static struct workqueue_struct *vxlan_wq;
152 
153 static void vxlan_sock_work(struct work_struct *work);
154 
155 #if IS_ENABLED(CONFIG_IPV6)
156 static inline
157 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
158 {
159        if (a->sa.sa_family != b->sa.sa_family)
160                return false;
161        if (a->sa.sa_family == AF_INET6)
162                return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
163        else
164                return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
165 }
166 
167 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
168 {
169        if (ipa->sa.sa_family == AF_INET6)
170                return ipv6_addr_any(&ipa->sin6.sin6_addr);
171        else
172                return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
173 }
174 
175 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
176 {
177        if (ipa->sa.sa_family == AF_INET6)
178                return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
179        else
180                return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
181 }
182 
183 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
184 {
185        if (nla_len(nla) >= sizeof(struct in6_addr)) {
186                nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
187                ip->sa.sa_family = AF_INET6;
188                return 0;
189        } else if (nla_len(nla) >= sizeof(__be32)) {
190                ip->sin.sin_addr.s_addr = nla_get_be32(nla);
191                ip->sa.sa_family = AF_INET;
192                return 0;
193        } else {
194                return -EAFNOSUPPORT;
195        }
196 }
197 
198 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
199                              const union vxlan_addr *ip)
200 {
201        if (ip->sa.sa_family == AF_INET6)
202                return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
203        else
204                return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
205 }
206 
207 #else /* !CONFIG_IPV6 */
208 
209 static inline
210 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
211 {
212        return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
213 }
214 
215 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
216 {
217        return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
218 }
219 
220 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
221 {
222        return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
223 }
224 
225 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
226 {
227        if (nla_len(nla) >= sizeof(struct in6_addr)) {
228                return -EAFNOSUPPORT;
229        } else if (nla_len(nla) >= sizeof(__be32)) {
230                ip->sin.sin_addr.s_addr = nla_get_be32(nla);
231                ip->sa.sa_family = AF_INET;
232                return 0;
233        } else {
234                return -EAFNOSUPPORT;
235        }
236 }
237 
238 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
239                              const union vxlan_addr *ip)
240 {
241        return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
242 }
243 #endif
244 
245 /* Virtual Network hash table head */
246 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
247 {
248         return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
249 }
250 
251 /* Socket hash table head */
252 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
253 {
254         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
255 
256         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
257 }
258 
259 /* First remote destination for a forwarding entry.
260  * Guaranteed to be non-NULL because remotes are never deleted.
261  */
262 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
263 {
264         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
265 }
266 
267 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
268 {
269         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
270 }
271 
272 /* Find VXLAN socket based on network namespace, address family and UDP port */
273 static struct vxlan_sock *vxlan_find_sock(struct net *net,
274                                           sa_family_t family, __be16 port)
275 {
276         struct vxlan_sock *vs;
277 
278         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
279                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
280                     inet_sk(vs->sock->sk)->sk.sk_family == family)
281                         return vs;
282         }
283         return NULL;
284 }
285 
286 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
287 {
288         struct vxlan_dev *vxlan;
289 
290         hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
291                 if (vxlan->default_dst.remote_vni == id)
292                         return vxlan;
293         }
294 
295         return NULL;
296 }
297 
298 /* Look up VNI in a per net namespace table */
299 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
300                                         sa_family_t family, __be16 port)
301 {
302         struct vxlan_sock *vs;
303 
304         vs = vxlan_find_sock(net, family, port);
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 (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
344                 goto nla_put_failure;
345 
346         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
347                 goto nla_put_failure;
348 
349         if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
350             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
351                 goto nla_put_failure;
352         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
353             nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
354                 goto nla_put_failure;
355         if (rdst->remote_ifindex &&
356             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
357                 goto nla_put_failure;
358 
359         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
360         ci.ndm_confirmed = 0;
361         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
362         ci.ndm_refcnt    = 0;
363 
364         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
365                 goto nla_put_failure;
366 
367         return nlmsg_end(skb, nlh);
368 
369 nla_put_failure:
370         nlmsg_cancel(skb, nlh);
371         return -EMSGSIZE;
372 }
373 
374 static inline size_t vxlan_nlmsg_size(void)
375 {
376         return NLMSG_ALIGN(sizeof(struct ndmsg))
377                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
378                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
379                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
380                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
381                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
382                 + nla_total_size(sizeof(struct nda_cacheinfo));
383 }
384 
385 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
386                              struct vxlan_rdst *rd, int type)
387 {
388         struct net *net = dev_net(vxlan->dev);
389         struct sk_buff *skb;
390         int err = -ENOBUFS;
391 
392         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
393         if (skb == NULL)
394                 goto errout;
395 
396         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
397         if (err < 0) {
398                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
399                 WARN_ON(err == -EMSGSIZE);
400                 kfree_skb(skb);
401                 goto errout;
402         }
403 
404         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
405         return;
406 errout:
407         if (err < 0)
408                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
409 }
410 
411 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
412 {
413         struct vxlan_dev *vxlan = netdev_priv(dev);
414         struct vxlan_fdb f = {
415                 .state = NUD_STALE,
416         };
417         struct vxlan_rdst remote = {
418                 .remote_ip = *ipa, /* goes to NDA_DST */
419                 .remote_vni = VXLAN_N_VID,
420         };
421 
422         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
423 }
424 
425 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
426 {
427         struct vxlan_fdb f = {
428                 .state = NUD_STALE,
429         };
430         struct vxlan_rdst remote = { };
431 
432         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
433 
434         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
435 }
436 
437 /* Hash Ethernet address */
438 static u32 eth_hash(const unsigned char *addr)
439 {
440         u64 value = get_unaligned((u64 *)addr);
441 
442         /* only want 6 bytes */
443 #ifdef __BIG_ENDIAN
444         value >>= 16;
445 #else
446         value <<= 16;
447 #endif
448         return hash_64(value, FDB_HASH_BITS);
449 }
450 
451 /* Hash chain to use given mac address */
452 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
453                                                 const u8 *mac)
454 {
455         return &vxlan->fdb_head[eth_hash(mac)];
456 }
457 
458 /* Look up Ethernet address in forwarding table */
459 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
460                                         const u8 *mac)
461 {
462         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
463         struct vxlan_fdb *f;
464 
465         hlist_for_each_entry_rcu(f, head, hlist) {
466                 if (ether_addr_equal(mac, f->eth_addr))
467                         return f;
468         }
469 
470         return NULL;
471 }
472 
473 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
474                                         const u8 *mac)
475 {
476         struct vxlan_fdb *f;
477 
478         f = __vxlan_find_mac(vxlan, mac);
479         if (f)
480                 f->used = jiffies;
481 
482         return f;
483 }
484 
485 /* caller should hold vxlan->hash_lock */
486 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
487                                               union vxlan_addr *ip, __be16 port,
488                                               __u32 vni, __u32 ifindex)
489 {
490         struct vxlan_rdst *rd;
491 
492         list_for_each_entry(rd, &f->remotes, list) {
493                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
494                     rd->remote_port == port &&
495                     rd->remote_vni == vni &&
496                     rd->remote_ifindex == ifindex)
497                         return rd;
498         }
499 
500         return NULL;
501 }
502 
503 /* Replace destination of unicast mac */
504 static int vxlan_fdb_replace(struct vxlan_fdb *f,
505                              union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
506 {
507         struct vxlan_rdst *rd;
508 
509         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
510         if (rd)
511                 return 0;
512 
513         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
514         if (!rd)
515                 return 0;
516         rd->remote_ip = *ip;
517         rd->remote_port = port;
518         rd->remote_vni = vni;
519         rd->remote_ifindex = ifindex;
520         return 1;
521 }
522 
523 /* Add/update destinations for multicast */
524 static int vxlan_fdb_append(struct vxlan_fdb *f,
525                             union vxlan_addr *ip, __be16 port, __u32 vni,
526                             __u32 ifindex, struct vxlan_rdst **rdp)
527 {
528         struct vxlan_rdst *rd;
529 
530         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
531         if (rd)
532                 return 0;
533 
534         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
535         if (rd == NULL)
536                 return -ENOBUFS;
537         rd->remote_ip = *ip;
538         rd->remote_port = port;
539         rd->remote_vni = vni;
540         rd->remote_ifindex = ifindex;
541 
542         list_add_tail_rcu(&rd->list, &f->remotes);
543 
544         *rdp = rd;
545         return 1;
546 }
547 
548 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
549 {
550         struct sk_buff *p, **pp = NULL;
551         struct vxlanhdr *vh, *vh2;
552         struct ethhdr *eh, *eh2;
553         unsigned int hlen, off_vx, off_eth;
554         const struct packet_offload *ptype;
555         __be16 type;
556         int flush = 1;
557 
558         off_vx = skb_gro_offset(skb);
559         hlen = off_vx + sizeof(*vh);
560         vh   = skb_gro_header_fast(skb, off_vx);
561         if (skb_gro_header_hard(skb, hlen)) {
562                 vh = skb_gro_header_slow(skb, hlen, off_vx);
563                 if (unlikely(!vh))
564                         goto out;
565         }
566         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
567         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
568 
569         off_eth = skb_gro_offset(skb);
570         hlen = off_eth + sizeof(*eh);
571         eh   = skb_gro_header_fast(skb, off_eth);
572         if (skb_gro_header_hard(skb, hlen)) {
573                 eh = skb_gro_header_slow(skb, hlen, off_eth);
574                 if (unlikely(!eh))
575                         goto out;
576         }
577 
578         flush = 0;
579 
580         for (p = *head; p; p = p->next) {
581                 if (!NAPI_GRO_CB(p)->same_flow)
582                         continue;
583 
584                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
585                 eh2 = (struct ethhdr   *)(p->data + off_eth);
586                 if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
587                         NAPI_GRO_CB(p)->same_flow = 0;
588                         continue;
589                 }
590         }
591 
592         type = eh->h_proto;
593 
594         rcu_read_lock();
595         ptype = gro_find_receive_by_type(type);
596         if (ptype == NULL) {
597                 flush = 1;
598                 goto out_unlock;
599         }
600 
601         skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
602         skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
603         pp = ptype->callbacks.gro_receive(head, skb);
604 
605 out_unlock:
606         rcu_read_unlock();
607 out:
608         NAPI_GRO_CB(skb)->flush |= flush;
609 
610         return pp;
611 }
612 
613 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
614 {
615         struct ethhdr *eh;
616         struct packet_offload *ptype;
617         __be16 type;
618         int vxlan_len  = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
619         int err = -ENOSYS;
620 
621         udp_tunnel_gro_complete(skb, nhoff);
622 
623         eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));
624         type = eh->h_proto;
625 
626         rcu_read_lock();
627         ptype = gro_find_complete_by_type(type);
628         if (ptype != NULL)
629                 err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len);
630 
631         rcu_read_unlock();
632         return err;
633 }
634 
635 /* Notify netdevs that UDP port started listening */
636 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
637 {
638         struct net_device *dev;
639         struct sock *sk = vs->sock->sk;
640         struct net *net = sock_net(sk);
641         sa_family_t sa_family = sk->sk_family;
642         __be16 port = inet_sk(sk)->inet_sport;
643         int err;
644 
645         if (sa_family == AF_INET) {
646                 err = udp_add_offload(&vs->udp_offloads);
647                 if (err)
648                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
649         }
650 
651         rcu_read_lock();
652         for_each_netdev_rcu(net, dev) {
653                 if (dev->netdev_ops->ndo_add_vxlan_port)
654                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
655                                                             port);
656         }
657         rcu_read_unlock();
658 }
659 
660 /* Notify netdevs that UDP port is no more listening */
661 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
662 {
663         struct net_device *dev;
664         struct sock *sk = vs->sock->sk;
665         struct net *net = sock_net(sk);
666         sa_family_t sa_family = sk->sk_family;
667         __be16 port = inet_sk(sk)->inet_sport;
668 
669         rcu_read_lock();
670         for_each_netdev_rcu(net, dev) {
671                 if (dev->netdev_ops->ndo_del_vxlan_port)
672                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
673                                                             port);
674         }
675         rcu_read_unlock();
676 
677         if (sa_family == AF_INET)
678                 udp_del_offload(&vs->udp_offloads);
679 }
680 
681 /* Add new entry to forwarding table -- assumes lock held */
682 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
683                             const u8 *mac, union vxlan_addr *ip,
684                             __u16 state, __u16 flags,
685                             __be16 port, __u32 vni, __u32 ifindex,
686                             __u8 ndm_flags)
687 {
688         struct vxlan_rdst *rd = NULL;
689         struct vxlan_fdb *f;
690         int notify = 0;
691 
692         f = __vxlan_find_mac(vxlan, mac);
693         if (f) {
694                 if (flags & NLM_F_EXCL) {
695                         netdev_dbg(vxlan->dev,
696                                    "lost race to create %pM\n", mac);
697                         return -EEXIST;
698                 }
699                 if (f->state != state) {
700                         f->state = state;
701                         f->updated = jiffies;
702                         notify = 1;
703                 }
704                 if (f->flags != ndm_flags) {
705                         f->flags = ndm_flags;
706                         f->updated = jiffies;
707                         notify = 1;
708                 }
709                 if ((flags & NLM_F_REPLACE)) {
710                         /* Only change unicasts */
711                         if (!(is_multicast_ether_addr(f->eth_addr) ||
712                              is_zero_ether_addr(f->eth_addr))) {
713                                 int rc = vxlan_fdb_replace(f, ip, port, vni,
714                                                            ifindex);
715 
716                                 if (rc < 0)
717                                         return rc;
718                                 notify |= rc;
719                         } else
720                                 return -EOPNOTSUPP;
721                 }
722                 if ((flags & NLM_F_APPEND) &&
723                     (is_multicast_ether_addr(f->eth_addr) ||
724                      is_zero_ether_addr(f->eth_addr))) {
725                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
726                                                   &rd);
727 
728                         if (rc < 0)
729                                 return rc;
730                         notify |= rc;
731                 }
732         } else {
733                 if (!(flags & NLM_F_CREATE))
734                         return -ENOENT;
735 
736                 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
737                         return -ENOSPC;
738 
739                 /* Disallow replace to add a multicast entry */
740                 if ((flags & NLM_F_REPLACE) &&
741                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
742                         return -EOPNOTSUPP;
743 
744                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
745                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
746                 if (!f)
747                         return -ENOMEM;
748 
749                 notify = 1;
750                 f->state = state;
751                 f->flags = ndm_flags;
752                 f->updated = f->used = jiffies;
753                 INIT_LIST_HEAD(&f->remotes);
754                 memcpy(f->eth_addr, mac, ETH_ALEN);
755 
756                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
757 
758                 ++vxlan->addrcnt;
759                 hlist_add_head_rcu(&f->hlist,
760                                    vxlan_fdb_head(vxlan, mac));
761         }
762 
763         if (notify) {
764                 if (rd == NULL)
765                         rd = first_remote_rtnl(f);
766                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
767         }
768 
769         return 0;
770 }
771 
772 static void vxlan_fdb_free(struct rcu_head *head)
773 {
774         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
775         struct vxlan_rdst *rd, *nd;
776 
777         list_for_each_entry_safe(rd, nd, &f->remotes, list)
778                 kfree(rd);
779         kfree(f);
780 }
781 
782 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
783 {
784         netdev_dbg(vxlan->dev,
785                     "delete %pM\n", f->eth_addr);
786 
787         --vxlan->addrcnt;
788         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
789 
790         hlist_del_rcu(&f->hlist);
791         call_rcu(&f->rcu, vxlan_fdb_free);
792 }
793 
794 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
795                            union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
796 {
797         struct net *net = dev_net(vxlan->dev);
798         int err;
799 
800         if (tb[NDA_DST]) {
801                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
802                 if (err)
803                         return err;
804         } else {
805                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
806                 if (remote->sa.sa_family == AF_INET) {
807                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
808                         ip->sa.sa_family = AF_INET;
809 #if IS_ENABLED(CONFIG_IPV6)
810                 } else {
811                         ip->sin6.sin6_addr = in6addr_any;
812                         ip->sa.sa_family = AF_INET6;
813 #endif
814                 }
815         }
816 
817         if (tb[NDA_PORT]) {
818                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
819                         return -EINVAL;
820                 *port = nla_get_be16(tb[NDA_PORT]);
821         } else {
822                 *port = vxlan->dst_port;
823         }
824 
825         if (tb[NDA_VNI]) {
826                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
827                         return -EINVAL;
828                 *vni = nla_get_u32(tb[NDA_VNI]);
829         } else {
830                 *vni = vxlan->default_dst.remote_vni;
831         }
832 
833         if (tb[NDA_IFINDEX]) {
834                 struct net_device *tdev;
835 
836                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
837                         return -EINVAL;
838                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
839                 tdev = __dev_get_by_index(net, *ifindex);
840                 if (!tdev)
841                         return -EADDRNOTAVAIL;
842         } else {
843                 *ifindex = 0;
844         }
845 
846         return 0;
847 }
848 
849 /* Add static entry (via netlink) */
850 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
851                          struct net_device *dev,
852                          const unsigned char *addr, u16 vid, u16 flags)
853 {
854         struct vxlan_dev *vxlan = netdev_priv(dev);
855         /* struct net *net = dev_net(vxlan->dev); */
856         union vxlan_addr ip;
857         __be16 port;
858         u32 vni, ifindex;
859         int err;
860 
861         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
862                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
863                         ndm->ndm_state);
864                 return -EINVAL;
865         }
866 
867         if (tb[NDA_DST] == NULL)
868                 return -EINVAL;
869 
870         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
871         if (err)
872                 return err;
873 
874         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
875                 return -EAFNOSUPPORT;
876 
877         spin_lock_bh(&vxlan->hash_lock);
878         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
879                                port, vni, ifindex, ndm->ndm_flags);
880         spin_unlock_bh(&vxlan->hash_lock);
881 
882         return err;
883 }
884 
885 /* Delete entry (via netlink) */
886 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
887                             struct net_device *dev,
888                             const unsigned char *addr, u16 vid)
889 {
890         struct vxlan_dev *vxlan = netdev_priv(dev);
891         struct vxlan_fdb *f;
892         struct vxlan_rdst *rd = NULL;
893         union vxlan_addr ip;
894         __be16 port;
895         u32 vni, ifindex;
896         int err;
897 
898         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
899         if (err)
900                 return err;
901 
902         err = -ENOENT;
903 
904         spin_lock_bh(&vxlan->hash_lock);
905         f = vxlan_find_mac(vxlan, addr);
906         if (!f)
907                 goto out;
908 
909         if (!vxlan_addr_any(&ip)) {
910                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
911                 if (!rd)
912                         goto out;
913         }
914 
915         err = 0;
916 
917         /* remove a destination if it's not the only one on the list,
918          * otherwise destroy the fdb entry
919          */
920         if (rd && !list_is_singular(&f->remotes)) {
921                 list_del_rcu(&rd->list);
922                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
923                 kfree_rcu(rd, rcu);
924                 goto out;
925         }
926 
927         vxlan_fdb_destroy(vxlan, f);
928 
929 out:
930         spin_unlock_bh(&vxlan->hash_lock);
931 
932         return err;
933 }
934 
935 /* Dump forwarding table */
936 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
937                           struct net_device *dev,
938                           struct net_device *filter_dev, int idx)
939 {
940         struct vxlan_dev *vxlan = netdev_priv(dev);
941         unsigned int h;
942 
943         for (h = 0; h < FDB_HASH_SIZE; ++h) {
944                 struct vxlan_fdb *f;
945                 int err;
946 
947                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
948                         struct vxlan_rdst *rd;
949 
950                         if (idx < cb->args[0])
951                                 goto skip;
952 
953                         list_for_each_entry_rcu(rd, &f->remotes, list) {
954                                 err = vxlan_fdb_info(skb, vxlan, f,
955                                                      NETLINK_CB(cb->skb).portid,
956                                                      cb->nlh->nlmsg_seq,
957                                                      RTM_NEWNEIGH,
958                                                      NLM_F_MULTI, rd);
959                                 if (err < 0)
960                                         goto out;
961                         }
962 skip:
963                         ++idx;
964                 }
965         }
966 out:
967         return idx;
968 }
969 
970 /* Watch incoming packets to learn mapping between Ethernet address
971  * and Tunnel endpoint.
972  * Return true if packet is bogus and should be droppped.
973  */
974 static bool vxlan_snoop(struct net_device *dev,
975                         union vxlan_addr *src_ip, const u8 *src_mac)
976 {
977         struct vxlan_dev *vxlan = netdev_priv(dev);
978         struct vxlan_fdb *f;
979 
980         f = vxlan_find_mac(vxlan, src_mac);
981         if (likely(f)) {
982                 struct vxlan_rdst *rdst = first_remote_rcu(f);
983 
984                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
985                         return false;
986 
987                 /* Don't migrate static entries, drop packets */
988                 if (f->state & NUD_NOARP)
989                         return true;
990 
991                 if (net_ratelimit())
992                         netdev_info(dev,
993                                     "%pM migrated from %pIS to %pIS\n",
994                                     src_mac, &rdst->remote_ip, &src_ip);
995 
996                 rdst->remote_ip = *src_ip;
997                 f->updated = jiffies;
998                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
999         } else {
1000                 /* learned new entry */
1001                 spin_lock(&vxlan->hash_lock);
1002 
1003                 /* close off race between vxlan_flush and incoming packets */
1004                 if (netif_running(dev))
1005                         vxlan_fdb_create(vxlan, src_mac, src_ip,
1006                                          NUD_REACHABLE,
1007                                          NLM_F_EXCL|NLM_F_CREATE,
1008                                          vxlan->dst_port,
1009                                          vxlan->default_dst.remote_vni,
1010                                          0, NTF_SELF);
1011                 spin_unlock(&vxlan->hash_lock);
1012         }
1013 
1014         return false;
1015 }
1016 
1017 /* See if multicast group is already in use by other ID */
1018 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1019 {
1020         struct vxlan_dev *vxlan;
1021 
1022         /* The vxlan_sock is only used by dev, leaving group has
1023          * no effect on other vxlan devices.
1024          */
1025         if (atomic_read(&dev->vn_sock->refcnt) == 1)
1026                 return false;
1027 
1028         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1029                 if (!netif_running(vxlan->dev) || vxlan == dev)
1030                         continue;
1031 
1032                 if (vxlan->vn_sock != dev->vn_sock)
1033                         continue;
1034 
1035                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1036                                       &dev->default_dst.remote_ip))
1037                         continue;
1038 
1039                 if (vxlan->default_dst.remote_ifindex !=
1040                     dev->default_dst.remote_ifindex)
1041                         continue;
1042 
1043                 return true;
1044         }
1045 
1046         return false;
1047 }
1048 
1049 static void vxlan_sock_hold(struct vxlan_sock *vs)
1050 {
1051         atomic_inc(&vs->refcnt);
1052 }
1053 
1054 void vxlan_sock_release(struct vxlan_sock *vs)
1055 {
1056         struct sock *sk = vs->sock->sk;
1057         struct net *net = sock_net(sk);
1058         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1059 
1060         if (!atomic_dec_and_test(&vs->refcnt))
1061                 return;
1062 
1063         spin_lock(&vn->sock_lock);
1064         hlist_del_rcu(&vs->hlist);
1065         vxlan_notify_del_rx_port(vs);
1066         spin_unlock(&vn->sock_lock);
1067 
1068         queue_work(vxlan_wq, &vs->del_work);
1069 }
1070 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1071 
1072 /* Callback to update multicast group membership when first VNI on
1073  * multicast asddress is brought up
1074  * Done as workqueue because ip_mc_join_group acquires RTNL.
1075  */
1076 static void vxlan_igmp_join(struct work_struct *work)
1077 {
1078         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1079         struct vxlan_sock *vs = vxlan->vn_sock;
1080         struct sock *sk = vs->sock->sk;
1081         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1082         int ifindex = vxlan->default_dst.remote_ifindex;
1083 
1084         lock_sock(sk);
1085         if (ip->sa.sa_family == AF_INET) {
1086                 struct ip_mreqn mreq = {
1087                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1088                         .imr_ifindex            = ifindex,
1089                 };
1090 
1091                 ip_mc_join_group(sk, &mreq);
1092 #if IS_ENABLED(CONFIG_IPV6)
1093         } else {
1094                 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1095                                              &ip->sin6.sin6_addr);
1096 #endif
1097         }
1098         release_sock(sk);
1099 
1100         vxlan_sock_release(vs);
1101         dev_put(vxlan->dev);
1102 }
1103 
1104 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1105 static void vxlan_igmp_leave(struct work_struct *work)
1106 {
1107         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1108         struct vxlan_sock *vs = vxlan->vn_sock;
1109         struct sock *sk = vs->sock->sk;
1110         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1111         int ifindex = vxlan->default_dst.remote_ifindex;
1112 
1113         lock_sock(sk);
1114         if (ip->sa.sa_family == AF_INET) {
1115                 struct ip_mreqn mreq = {
1116                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1117                         .imr_ifindex            = ifindex,
1118                 };
1119 
1120                 ip_mc_leave_group(sk, &mreq);
1121 #if IS_ENABLED(CONFIG_IPV6)
1122         } else {
1123                 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1124                                              &ip->sin6.sin6_addr);
1125 #endif
1126         }
1127 
1128         release_sock(sk);
1129 
1130         vxlan_sock_release(vs);
1131         dev_put(vxlan->dev);
1132 }
1133 
1134 /* Callback from net/ipv4/udp.c to receive packets */
1135 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1136 {
1137         struct vxlan_sock *vs;
1138         struct vxlanhdr *vxh;
1139 
1140         /* Need Vxlan and inner Ethernet header to be present */
1141         if (!pskb_may_pull(skb, VXLAN_HLEN))
1142                 goto error;
1143 
1144         /* Return packets with reserved bits set */
1145         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1146         if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1147             (vxh->vx_vni & htonl(0xff))) {
1148                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1149                            ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1150                 goto error;
1151         }
1152 
1153         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1154                 goto drop;
1155 
1156         vs = rcu_dereference_sk_user_data(sk);
1157         if (!vs)
1158                 goto drop;
1159 
1160         vs->rcv(vs, skb, vxh->vx_vni);
1161         return 0;
1162 
1163 drop:
1164         /* Consume bad packet */
1165         kfree_skb(skb);
1166         return 0;
1167 
1168 error:
1169         /* Return non vxlan pkt */
1170         return 1;
1171 }
1172 
1173 static void vxlan_rcv(struct vxlan_sock *vs,
1174                       struct sk_buff *skb, __be32 vx_vni)
1175 {
1176         struct iphdr *oip = NULL;
1177         struct ipv6hdr *oip6 = NULL;
1178         struct vxlan_dev *vxlan;
1179         struct pcpu_sw_netstats *stats;
1180         union vxlan_addr saddr;
1181         __u32 vni;
1182         int err = 0;
1183         union vxlan_addr *remote_ip;
1184 
1185         vni = ntohl(vx_vni) >> 8;
1186         /* Is this VNI defined? */
1187         vxlan = vxlan_vs_find_vni(vs, vni);
1188         if (!vxlan)
1189                 goto drop;
1190 
1191         remote_ip = &vxlan->default_dst.remote_ip;
1192         skb_reset_mac_header(skb);
1193         skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1194         skb->protocol = eth_type_trans(skb, vxlan->dev);
1195         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1196 
1197         /* Ignore packet loops (and multicast echo) */
1198         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1199                 goto drop;
1200 
1201         /* Re-examine inner Ethernet packet */
1202         if (remote_ip->sa.sa_family == AF_INET) {
1203                 oip = ip_hdr(skb);
1204                 saddr.sin.sin_addr.s_addr = oip->saddr;
1205                 saddr.sa.sa_family = AF_INET;
1206 #if IS_ENABLED(CONFIG_IPV6)
1207         } else {
1208                 oip6 = ipv6_hdr(skb);
1209                 saddr.sin6.sin6_addr = oip6->saddr;
1210                 saddr.sa.sa_family = AF_INET6;
1211 #endif
1212         }
1213 
1214         if ((vxlan->flags & VXLAN_F_LEARN) &&
1215             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1216                 goto drop;
1217 
1218         skb_reset_network_header(skb);
1219 
1220         if (oip6)
1221                 err = IP6_ECN_decapsulate(oip6, skb);
1222         if (oip)
1223                 err = IP_ECN_decapsulate(oip, skb);
1224 
1225         if (unlikely(err)) {
1226                 if (log_ecn_error) {
1227                         if (oip6)
1228                                 net_info_ratelimited("non-ECT from %pI6\n",
1229                                                      &oip6->saddr);
1230                         if (oip)
1231                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1232                                                      &oip->saddr, oip->tos);
1233                 }
1234                 if (err > 1) {
1235                         ++vxlan->dev->stats.rx_frame_errors;
1236                         ++vxlan->dev->stats.rx_errors;
1237                         goto drop;
1238                 }
1239         }
1240 
1241         stats = this_cpu_ptr(vxlan->dev->tstats);
1242         u64_stats_update_begin(&stats->syncp);
1243         stats->rx_packets++;
1244         stats->rx_bytes += skb->len;
1245         u64_stats_update_end(&stats->syncp);
1246 
1247         netif_rx(skb);
1248 
1249         return;
1250 drop:
1251         /* Consume bad packet */
1252         kfree_skb(skb);
1253 }
1254 
1255 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1256 {
1257         struct vxlan_dev *vxlan = netdev_priv(dev);
1258         struct arphdr *parp;
1259         u8 *arpptr, *sha;
1260         __be32 sip, tip;
1261         struct neighbour *n;
1262 
1263         if (dev->flags & IFF_NOARP)
1264                 goto out;
1265 
1266         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1267                 dev->stats.tx_dropped++;
1268                 goto out;
1269         }
1270         parp = arp_hdr(skb);
1271 
1272         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1273              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1274             parp->ar_pro != htons(ETH_P_IP) ||
1275             parp->ar_op != htons(ARPOP_REQUEST) ||
1276             parp->ar_hln != dev->addr_len ||
1277             parp->ar_pln != 4)
1278                 goto out;
1279         arpptr = (u8 *)parp + sizeof(struct arphdr);
1280         sha = arpptr;
1281         arpptr += dev->addr_len;        /* sha */
1282         memcpy(&sip, arpptr, sizeof(sip));
1283         arpptr += sizeof(sip);
1284         arpptr += dev->addr_len;        /* tha */
1285         memcpy(&tip, arpptr, sizeof(tip));
1286 
1287         if (ipv4_is_loopback(tip) ||
1288             ipv4_is_multicast(tip))
1289                 goto out;
1290 
1291         n = neigh_lookup(&arp_tbl, &tip, dev);
1292 
1293         if (n) {
1294                 struct vxlan_fdb *f;
1295                 struct sk_buff  *reply;
1296 
1297                 if (!(n->nud_state & NUD_CONNECTED)) {
1298                         neigh_release(n);
1299                         goto out;
1300                 }
1301 
1302                 f = vxlan_find_mac(vxlan, n->ha);
1303                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1304                         /* bridge-local neighbor */
1305                         neigh_release(n);
1306                         goto out;
1307                 }
1308 
1309                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1310                                 n->ha, sha);
1311 
1312                 neigh_release(n);
1313 
1314                 if (reply == NULL)
1315                         goto out;
1316 
1317                 skb_reset_mac_header(reply);
1318                 __skb_pull(reply, skb_network_offset(reply));
1319                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1320                 reply->pkt_type = PACKET_HOST;
1321 
1322                 if (netif_rx_ni(reply) == NET_RX_DROP)
1323                         dev->stats.rx_dropped++;
1324         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1325                 union vxlan_addr ipa = {
1326                         .sin.sin_addr.s_addr = tip,
1327                         .sin.sin_family = AF_INET,
1328                 };
1329 
1330                 vxlan_ip_miss(dev, &ipa);
1331         }
1332 out:
1333         consume_skb(skb);
1334         return NETDEV_TX_OK;
1335 }
1336 
1337 #if IS_ENABLED(CONFIG_IPV6)
1338 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1339         struct neighbour *n, bool isrouter)
1340 {
1341         struct net_device *dev = request->dev;
1342         struct sk_buff *reply;
1343         struct nd_msg *ns, *na;
1344         struct ipv6hdr *pip6;
1345         u8 *daddr;
1346         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1347         int ns_olen;
1348         int i, len;
1349 
1350         if (dev == NULL)
1351                 return NULL;
1352 
1353         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1354                 sizeof(*na) + na_olen + dev->needed_tailroom;
1355         reply = alloc_skb(len, GFP_ATOMIC);
1356         if (reply == NULL)
1357                 return NULL;
1358 
1359         reply->protocol = htons(ETH_P_IPV6);
1360         reply->dev = dev;
1361         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1362         skb_push(reply, sizeof(struct ethhdr));
1363         skb_set_mac_header(reply, 0);
1364 
1365         ns = (struct nd_msg *)skb_transport_header(request);
1366 
1367         daddr = eth_hdr(request)->h_source;
1368         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1369         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1370                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1371                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1372                         break;
1373                 }
1374         }
1375 
1376         /* Ethernet header */
1377         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1378         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1379         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1380         reply->protocol = htons(ETH_P_IPV6);
1381 
1382         skb_pull(reply, sizeof(struct ethhdr));
1383         skb_set_network_header(reply, 0);
1384         skb_put(reply, sizeof(struct ipv6hdr));
1385 
1386         /* IPv6 header */
1387 
1388         pip6 = ipv6_hdr(reply);
1389         memset(pip6, 0, sizeof(struct ipv6hdr));
1390         pip6->version = 6;
1391         pip6->priority = ipv6_hdr(request)->priority;
1392         pip6->nexthdr = IPPROTO_ICMPV6;
1393         pip6->hop_limit = 255;
1394         pip6->daddr = ipv6_hdr(request)->saddr;
1395         pip6->saddr = *(struct in6_addr *)n->primary_key;
1396 
1397         skb_pull(reply, sizeof(struct ipv6hdr));
1398         skb_set_transport_header(reply, 0);
1399 
1400         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1401 
1402         /* Neighbor Advertisement */
1403         memset(na, 0, sizeof(*na)+na_olen);
1404         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1405         na->icmph.icmp6_router = isrouter;
1406         na->icmph.icmp6_override = 1;
1407         na->icmph.icmp6_solicited = 1;
1408         na->target = ns->target;
1409         ether_addr_copy(&na->opt[2], n->ha);
1410         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1411         na->opt[1] = na_olen >> 3;
1412 
1413         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1414                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1415                 csum_partial(na, sizeof(*na)+na_olen, 0));
1416 
1417         pip6->payload_len = htons(sizeof(*na)+na_olen);
1418 
1419         skb_push(reply, sizeof(struct ipv6hdr));
1420 
1421         reply->ip_summed = CHECKSUM_UNNECESSARY;
1422 
1423         return reply;
1424 }
1425 
1426 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1427 {
1428         struct vxlan_dev *vxlan = netdev_priv(dev);
1429         struct nd_msg *msg;
1430         const struct ipv6hdr *iphdr;
1431         const struct in6_addr *saddr, *daddr;
1432         struct neighbour *n;
1433         struct inet6_dev *in6_dev;
1434 
1435         in6_dev = __in6_dev_get(dev);
1436         if (!in6_dev)
1437                 goto out;
1438 
1439         iphdr = ipv6_hdr(skb);
1440         saddr = &iphdr->saddr;
1441         daddr = &iphdr->daddr;
1442 
1443         msg = (struct nd_msg *)skb_transport_header(skb);
1444         if (msg->icmph.icmp6_code != 0 ||
1445             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1446                 goto out;
1447 
1448         if (ipv6_addr_loopback(daddr) ||
1449             ipv6_addr_is_multicast(&msg->target))
1450                 goto out;
1451 
1452         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1453 
1454         if (n) {
1455                 struct vxlan_fdb *f;
1456                 struct sk_buff *reply;
1457 
1458                 if (!(n->nud_state & NUD_CONNECTED)) {
1459                         neigh_release(n);
1460                         goto out;
1461                 }
1462 
1463                 f = vxlan_find_mac(vxlan, n->ha);
1464                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1465                         /* bridge-local neighbor */
1466                         neigh_release(n);
1467                         goto out;
1468                 }
1469 
1470                 reply = vxlan_na_create(skb, n,
1471                                         !!(f ? f->flags & NTF_ROUTER : 0));
1472 
1473                 neigh_release(n);
1474 
1475                 if (reply == NULL)
1476                         goto out;
1477 
1478                 if (netif_rx_ni(reply) == NET_RX_DROP)
1479                         dev->stats.rx_dropped++;
1480 
1481         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1482                 union vxlan_addr ipa = {
1483                         .sin6.sin6_addr = msg->target,
1484                         .sin6.sin6_family = AF_INET6,
1485                 };
1486 
1487                 vxlan_ip_miss(dev, &ipa);
1488         }
1489 
1490 out:
1491         consume_skb(skb);
1492         return NETDEV_TX_OK;
1493 }
1494 #endif
1495 
1496 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1497 {
1498         struct vxlan_dev *vxlan = netdev_priv(dev);
1499         struct neighbour *n;
1500 
1501         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1502                 return false;
1503 
1504         n = NULL;
1505         switch (ntohs(eth_hdr(skb)->h_proto)) {
1506         case ETH_P_IP:
1507         {
1508                 struct iphdr *pip;
1509 
1510                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1511                         return false;
1512                 pip = ip_hdr(skb);
1513                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1514                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1515                         union vxlan_addr ipa = {
1516                                 .sin.sin_addr.s_addr = pip->daddr,
1517                                 .sin.sin_family = AF_INET,
1518                         };
1519 
1520                         vxlan_ip_miss(dev, &ipa);
1521                         return false;
1522                 }
1523 
1524                 break;
1525         }
1526 #if IS_ENABLED(CONFIG_IPV6)
1527         case ETH_P_IPV6:
1528         {
1529                 struct ipv6hdr *pip6;
1530 
1531                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1532                         return false;
1533                 pip6 = ipv6_hdr(skb);
1534                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1535                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1536                         union vxlan_addr ipa = {
1537                                 .sin6.sin6_addr = pip6->daddr,
1538                                 .sin6.sin6_family = AF_INET6,
1539                         };
1540 
1541                         vxlan_ip_miss(dev, &ipa);
1542                         return false;
1543                 }
1544 
1545                 break;
1546         }
1547 #endif
1548         default:
1549                 return false;
1550         }
1551 
1552         if (n) {
1553                 bool diff;
1554 
1555                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1556                 if (diff) {
1557                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1558                                 dev->addr_len);
1559                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1560                 }
1561                 neigh_release(n);
1562                 return diff;
1563         }
1564 
1565         return false;
1566 }
1567 
1568 #if IS_ENABLED(CONFIG_IPV6)
1569 static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1570                            struct dst_entry *dst, struct sk_buff *skb,
1571                            struct net_device *dev, struct in6_addr *saddr,
1572                            struct in6_addr *daddr, __u8 prio, __u8 ttl,
1573                            __be16 src_port, __be16 dst_port, __be32 vni,
1574                            bool xnet)
1575 {
1576         struct vxlanhdr *vxh;
1577         int min_headroom;
1578         int err;
1579         bool udp_sum = !udp_get_no_check6_tx(vs->sock->sk);
1580 
1581         skb = udp_tunnel_handle_offloads(skb, udp_sum);
1582         if (IS_ERR(skb)) {
1583                 err = -EINVAL;
1584                 goto err;
1585         }
1586 
1587         skb_scrub_packet(skb, xnet);
1588 
1589         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1590                         + VXLAN_HLEN + sizeof(struct ipv6hdr)
1591                         + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1592 
1593         /* Need space for new headers (invalidates iph ptr) */
1594         err = skb_cow_head(skb, min_headroom);
1595         if (unlikely(err)) {
1596                 kfree_skb(skb);
1597                 goto err;
1598         }
1599 
1600         skb = vlan_hwaccel_push_inside(skb);
1601         if (WARN_ON(!skb)) {
1602                 err = -ENOMEM;
1603                 goto err;
1604         }
1605 
1606         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1607         vxh->vx_flags = htonl(VXLAN_FLAGS);
1608         vxh->vx_vni = vni;
1609 
1610         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1611 
1612         udp_tunnel6_xmit_skb(vs->sock, dst, skb, dev, saddr, daddr, prio,
1613                              ttl, src_port, dst_port);
1614         return 0;
1615 err:
1616         dst_release(dst);
1617         return err;
1618 }
1619 #endif
1620 
1621 int vxlan_xmit_skb(struct vxlan_sock *vs,
1622                    struct rtable *rt, struct sk_buff *skb,
1623                    __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1624                    __be16 src_port, __be16 dst_port, __be32 vni, bool xnet)
1625 {
1626         struct vxlanhdr *vxh;
1627         int min_headroom;
1628         int err;
1629         bool udp_sum = !vs->sock->sk->sk_no_check_tx;
1630 
1631         skb = udp_tunnel_handle_offloads(skb, udp_sum);
1632         if (IS_ERR(skb))
1633                 return PTR_ERR(skb);
1634 
1635         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1636                         + VXLAN_HLEN + sizeof(struct iphdr)
1637                         + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1638 
1639         /* Need space for new headers (invalidates iph ptr) */
1640         err = skb_cow_head(skb, min_headroom);
1641         if (unlikely(err)) {
1642                 kfree_skb(skb);
1643                 return err;
1644         }
1645 
1646         skb = vlan_hwaccel_push_inside(skb);
1647         if (WARN_ON(!skb))
1648                 return -ENOMEM;
1649 
1650         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1651         vxh->vx_flags = htonl(VXLAN_FLAGS);
1652         vxh->vx_vni = vni;
1653 
1654         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1655 
1656         return udp_tunnel_xmit_skb(vs->sock, rt, skb, src, dst, tos,
1657                                    ttl, df, src_port, dst_port, xnet);
1658 }
1659 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1660 
1661 /* Bypass encapsulation if the destination is local */
1662 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1663                                struct vxlan_dev *dst_vxlan)
1664 {
1665         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1666         union vxlan_addr loopback;
1667         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1668         struct net_device *dev = skb->dev;
1669         int len = skb->len;
1670 
1671         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1672         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1673         skb->pkt_type = PACKET_HOST;
1674         skb->encapsulation = 0;
1675         skb->dev = dst_vxlan->dev;
1676         __skb_pull(skb, skb_network_offset(skb));
1677 
1678         if (remote_ip->sa.sa_family == AF_INET) {
1679                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1680                 loopback.sa.sa_family =  AF_INET;
1681 #if IS_ENABLED(CONFIG_IPV6)
1682         } else {
1683                 loopback.sin6.sin6_addr = in6addr_loopback;
1684                 loopback.sa.sa_family =  AF_INET6;
1685 #endif
1686         }
1687 
1688         if (dst_vxlan->flags & VXLAN_F_LEARN)
1689                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1690 
1691         u64_stats_update_begin(&tx_stats->syncp);
1692         tx_stats->tx_packets++;
1693         tx_stats->tx_bytes += len;
1694         u64_stats_update_end(&tx_stats->syncp);
1695 
1696         if (netif_rx(skb) == NET_RX_SUCCESS) {
1697                 u64_stats_update_begin(&rx_stats->syncp);
1698                 rx_stats->rx_packets++;
1699                 rx_stats->rx_bytes += len;
1700                 u64_stats_update_end(&rx_stats->syncp);
1701         } else {
1702                 dev->stats.rx_dropped++;
1703         }
1704 }
1705 
1706 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1707                            struct vxlan_rdst *rdst, bool did_rsc)
1708 {
1709         struct vxlan_dev *vxlan = netdev_priv(dev);
1710         struct rtable *rt = NULL;
1711         const struct iphdr *old_iph;
1712         struct flowi4 fl4;
1713         union vxlan_addr *dst;
1714         __be16 src_port = 0, dst_port;
1715         u32 vni;
1716         __be16 df = 0;
1717         __u8 tos, ttl;
1718         int err;
1719 
1720         dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1721         vni = rdst->remote_vni;
1722         dst = &rdst->remote_ip;
1723 
1724         if (vxlan_addr_any(dst)) {
1725                 if (did_rsc) {
1726                         /* short-circuited back to local bridge */
1727                         vxlan_encap_bypass(skb, vxlan, vxlan);
1728                         return;
1729                 }
1730                 goto drop;
1731         }
1732 
1733         old_iph = ip_hdr(skb);
1734 
1735         ttl = vxlan->ttl;
1736         if (!ttl && vxlan_addr_multicast(dst))
1737                 ttl = 1;
1738 
1739         tos = vxlan->tos;
1740         if (tos == 1)
1741                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1742 
1743         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1744                                      vxlan->port_max, true);
1745 
1746         if (dst->sa.sa_family == AF_INET) {
1747                 memset(&fl4, 0, sizeof(fl4));
1748                 fl4.flowi4_oif = rdst->remote_ifindex;
1749                 fl4.flowi4_tos = RT_TOS(tos);
1750                 fl4.daddr = dst->sin.sin_addr.s_addr;
1751                 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1752 
1753                 rt = ip_route_output_key(vxlan->net, &fl4);
1754                 if (IS_ERR(rt)) {
1755                         netdev_dbg(dev, "no route to %pI4\n",
1756                                    &dst->sin.sin_addr.s_addr);
1757                         dev->stats.tx_carrier_errors++;
1758                         goto tx_error;
1759                 }
1760 
1761                 if (rt->dst.dev == dev) {
1762                         netdev_dbg(dev, "circular route to %pI4\n",
1763                                    &dst->sin.sin_addr.s_addr);
1764                         dev->stats.collisions++;
1765                         goto rt_tx_error;
1766                 }
1767 
1768                 /* Bypass encapsulation if the destination is local */
1769                 if (rt->rt_flags & RTCF_LOCAL &&
1770                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1771                         struct vxlan_dev *dst_vxlan;
1772 
1773                         ip_rt_put(rt);
1774                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1775                                                    dst->sa.sa_family, dst_port);
1776                         if (!dst_vxlan)
1777                                 goto tx_error;
1778                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1779                         return;
1780                 }
1781 
1782                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1783                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1784 
1785                 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1786                                      fl4.saddr, dst->sin.sin_addr.s_addr,
1787                                      tos, ttl, df, src_port, dst_port,
1788                                      htonl(vni << 8),
1789                                      !net_eq(vxlan->net, dev_net(vxlan->dev)));
1790                 if (err < 0) {
1791                         /* skb is already freed. */
1792                         skb = NULL;
1793                         goto rt_tx_error;
1794                 }
1795 
1796                 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1797 #if IS_ENABLED(CONFIG_IPV6)
1798         } else {
1799                 struct sock *sk = vxlan->vn_sock->sock->sk;
1800                 struct dst_entry *ndst;
1801                 struct flowi6 fl6;
1802                 u32 flags;
1803 
1804                 memset(&fl6, 0, sizeof(fl6));
1805                 fl6.flowi6_oif = rdst->remote_ifindex;
1806                 fl6.daddr = dst->sin6.sin6_addr;
1807                 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1808                 fl6.flowi6_proto = IPPROTO_UDP;
1809 
1810                 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1811                         netdev_dbg(dev, "no route to %pI6\n",
1812                                    &dst->sin6.sin6_addr);
1813                         dev->stats.tx_carrier_errors++;
1814                         goto tx_error;
1815                 }
1816 
1817                 if (ndst->dev == dev) {
1818                         netdev_dbg(dev, "circular route to %pI6\n",
1819                                    &dst->sin6.sin6_addr);
1820                         dst_release(ndst);
1821                         dev->stats.collisions++;
1822                         goto tx_error;
1823                 }
1824 
1825                 /* Bypass encapsulation if the destination is local */
1826                 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1827                 if (flags & RTF_LOCAL &&
1828                     !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1829                         struct vxlan_dev *dst_vxlan;
1830 
1831                         dst_release(ndst);
1832                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1833                                                    dst->sa.sa_family, dst_port);
1834                         if (!dst_vxlan)
1835                                 goto tx_error;
1836                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1837                         return;
1838                 }
1839 
1840                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1841 
1842                 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
1843                                       dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1844                                       src_port, dst_port, htonl(vni << 8),
1845                                       !net_eq(vxlan->net, dev_net(vxlan->dev)));
1846 #endif
1847         }
1848 
1849         return;
1850 
1851 drop:
1852         dev->stats.tx_dropped++;
1853         goto tx_free;
1854 
1855 rt_tx_error:
1856         ip_rt_put(rt);
1857 tx_error:
1858         dev->stats.tx_errors++;
1859 tx_free:
1860         dev_kfree_skb(skb);
1861 }
1862 
1863 /* Transmit local packets over Vxlan
1864  *
1865  * Outer IP header inherits ECN and DF from inner header.
1866  * Outer UDP destination is the VXLAN assigned port.
1867  *           source port is based on hash of flow
1868  */
1869 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1870 {
1871         struct vxlan_dev *vxlan = netdev_priv(dev);
1872         struct ethhdr *eth;
1873         bool did_rsc = false;
1874         struct vxlan_rdst *rdst, *fdst = NULL;
1875         struct vxlan_fdb *f;
1876 
1877         skb_reset_mac_header(skb);
1878         eth = eth_hdr(skb);
1879 
1880         if ((vxlan->flags & VXLAN_F_PROXY)) {
1881                 if (ntohs(eth->h_proto) == ETH_P_ARP)
1882                         return arp_reduce(dev, skb);
1883 #if IS_ENABLED(CONFIG_IPV6)
1884                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1885                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
1886                                        + sizeof(struct nd_msg)) &&
1887                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1888                                 struct nd_msg *msg;
1889 
1890                                 msg = (struct nd_msg *)skb_transport_header(skb);
1891                                 if (msg->icmph.icmp6_code == 0 &&
1892                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1893                                         return neigh_reduce(dev, skb);
1894                 }
1895                 eth = eth_hdr(skb);
1896 #endif
1897         }
1898 
1899         f = vxlan_find_mac(vxlan, eth->h_dest);
1900         did_rsc = false;
1901 
1902         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1903             (ntohs(eth->h_proto) == ETH_P_IP ||
1904              ntohs(eth->h_proto) == ETH_P_IPV6)) {
1905                 did_rsc = route_shortcircuit(dev, skb);
1906                 if (did_rsc)
1907                         f = vxlan_find_mac(vxlan, eth->h_dest);
1908         }
1909 
1910         if (f == NULL) {
1911                 f = vxlan_find_mac(vxlan, all_zeros_mac);
1912                 if (f == NULL) {
1913                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
1914                             !is_multicast_ether_addr(eth->h_dest))
1915                                 vxlan_fdb_miss(vxlan, eth->h_dest);
1916 
1917                         dev->stats.tx_dropped++;
1918                         kfree_skb(skb);
1919                         return NETDEV_TX_OK;
1920                 }
1921         }
1922 
1923         list_for_each_entry_rcu(rdst, &f->remotes, list) {
1924                 struct sk_buff *skb1;
1925 
1926                 if (!fdst) {
1927                         fdst = rdst;
1928                         continue;
1929                 }
1930                 skb1 = skb_clone(skb, GFP_ATOMIC);
1931                 if (skb1)
1932                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1933         }
1934 
1935         if (fdst)
1936                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
1937         else
1938                 kfree_skb(skb);
1939         return NETDEV_TX_OK;
1940 }
1941 
1942 /* Walk the forwarding table and purge stale entries */
1943 static void vxlan_cleanup(unsigned long arg)
1944 {
1945         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1946         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1947         unsigned int h;
1948 
1949         if (!netif_running(vxlan->dev))
1950                 return;
1951 
1952         spin_lock_bh(&vxlan->hash_lock);
1953         for (h = 0; h < FDB_HASH_SIZE; ++h) {
1954                 struct hlist_node *p, *n;
1955                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1956                         struct vxlan_fdb *f
1957                                 = container_of(p, struct vxlan_fdb, hlist);
1958                         unsigned long timeout;
1959 
1960                         if (f->state & NUD_PERMANENT)
1961                                 continue;
1962 
1963                         timeout = f->used + vxlan->age_interval * HZ;
1964                         if (time_before_eq(timeout, jiffies)) {
1965                                 netdev_dbg(vxlan->dev,
1966                                            "garbage collect %pM\n",
1967                                            f->eth_addr);
1968                                 f->state = NUD_STALE;
1969                                 vxlan_fdb_destroy(vxlan, f);
1970                         } else if (time_before(timeout, next_timer))
1971                                 next_timer = timeout;
1972                 }
1973         }
1974         spin_unlock_bh(&vxlan->hash_lock);
1975 
1976         mod_timer(&vxlan->age_timer, next_timer);
1977 }
1978 
1979 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
1980 {
1981         __u32 vni = vxlan->default_dst.remote_vni;
1982 
1983         vxlan->vn_sock = vs;
1984         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1985 }
1986 
1987 /* Setup stats when device is created */
1988 static int vxlan_init(struct net_device *dev)
1989 {
1990         struct vxlan_dev *vxlan = netdev_priv(dev);
1991         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
1992         struct vxlan_sock *vs;
1993         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
1994 
1995         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1996         if (!dev->tstats)
1997                 return -ENOMEM;
1998 
1999         spin_lock(&vn->sock_lock);
2000         vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2001                              vxlan->dst_port);
2002         if (vs && atomic_add_unless(&vs->refcnt, 1, 0)) {
2003                 /* If we have a socket with same port already, reuse it */
2004                 vxlan_vs_add_dev(vs, vxlan);
2005         } else {
2006                 /* otherwise make new socket outside of RTNL */
2007                 dev_hold(dev);
2008                 queue_work(vxlan_wq, &vxlan->sock_work);
2009         }
2010         spin_unlock(&vn->sock_lock);
2011 
2012         return 0;
2013 }
2014 
2015 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2016 {
2017         struct vxlan_fdb *f;
2018 
2019         spin_lock_bh(&vxlan->hash_lock);
2020         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2021         if (f)
2022                 vxlan_fdb_destroy(vxlan, f);
2023         spin_unlock_bh(&vxlan->hash_lock);
2024 }
2025 
2026 static void vxlan_uninit(struct net_device *dev)
2027 {
2028         struct vxlan_dev *vxlan = netdev_priv(dev);
2029         struct vxlan_sock *vs = vxlan->vn_sock;
2030 
2031         vxlan_fdb_delete_default(vxlan);
2032 
2033         if (vs)
2034                 vxlan_sock_release(vs);
2035         free_percpu(dev->tstats);
2036 }
2037 
2038 /* Start ageing timer and join group when device is brought up */
2039 static int vxlan_open(struct net_device *dev)
2040 {
2041         struct vxlan_dev *vxlan = netdev_priv(dev);
2042         struct vxlan_sock *vs = vxlan->vn_sock;
2043 
2044         /* socket hasn't been created */
2045         if (!vs)
2046                 return -ENOTCONN;
2047 
2048         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2049                 vxlan_sock_hold(vs);
2050                 dev_hold(dev);
2051                 queue_work(vxlan_wq, &vxlan->igmp_join);
2052         }
2053 
2054         if (vxlan->age_interval)
2055                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2056 
2057         return 0;
2058 }
2059 
2060 /* Purge the forwarding table */
2061 static void vxlan_flush(struct vxlan_dev *vxlan)
2062 {
2063         unsigned int h;
2064 
2065         spin_lock_bh(&vxlan->hash_lock);
2066         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2067                 struct hlist_node *p, *n;
2068                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2069                         struct vxlan_fdb *f
2070                                 = container_of(p, struct vxlan_fdb, hlist);
2071                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2072                         if (!is_zero_ether_addr(f->eth_addr))
2073                                 vxlan_fdb_destroy(vxlan, f);
2074                 }
2075         }
2076         spin_unlock_bh(&vxlan->hash_lock);
2077 }
2078 
2079 /* Cleanup timer and forwarding table on shutdown */
2080 static int vxlan_stop(struct net_device *dev)
2081 {
2082         struct vxlan_dev *vxlan = netdev_priv(dev);
2083         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2084         struct vxlan_sock *vs = vxlan->vn_sock;
2085 
2086         if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2087             !vxlan_group_used(vn, vxlan)) {
2088                 vxlan_sock_hold(vs);
2089                 dev_hold(dev);
2090                 queue_work(vxlan_wq, &vxlan->igmp_leave);
2091         }
2092 
2093         del_timer_sync(&vxlan->age_timer);
2094 
2095         vxlan_flush(vxlan);
2096 
2097         return 0;
2098 }
2099 
2100 /* Stub, nothing needs to be done. */
2101 static void vxlan_set_multicast_list(struct net_device *dev)
2102 {
2103 }
2104 
2105 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2106 {
2107         struct vxlan_dev *vxlan = netdev_priv(dev);
2108         struct vxlan_rdst *dst = &vxlan->default_dst;
2109         struct net_device *lowerdev;
2110         int max_mtu;
2111 
2112         lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2113         if (lowerdev == NULL)
2114                 return eth_change_mtu(dev, new_mtu);
2115 
2116         if (dst->remote_ip.sa.sa_family == AF_INET6)
2117                 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2118         else
2119                 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2120 
2121         if (new_mtu < 68 || new_mtu > max_mtu)
2122                 return -EINVAL;
2123 
2124         dev->mtu = new_mtu;
2125         return 0;
2126 }
2127 
2128 static const struct net_device_ops vxlan_netdev_ops = {
2129         .ndo_init               = vxlan_init,
2130         .ndo_uninit             = vxlan_uninit,
2131         .ndo_open               = vxlan_open,
2132         .ndo_stop               = vxlan_stop,
2133         .ndo_start_xmit         = vxlan_xmit,
2134         .ndo_get_stats64        = ip_tunnel_get_stats64,
2135         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2136         .ndo_change_mtu         = vxlan_change_mtu,
2137         .ndo_validate_addr      = eth_validate_addr,
2138         .ndo_set_mac_address    = eth_mac_addr,
2139         .ndo_fdb_add            = vxlan_fdb_add,
2140         .ndo_fdb_del            = vxlan_fdb_delete,
2141         .ndo_fdb_dump           = vxlan_fdb_dump,
2142 };
2143 
2144 /* Info for udev, that this is a virtual tunnel endpoint */
2145 static struct device_type vxlan_type = {
2146         .name = "vxlan",
2147 };
2148 
2149 /* Calls the ndo_add_vxlan_port of the caller in order to
2150  * supply the listening VXLAN udp ports. Callers are expected
2151  * to implement the ndo_add_vxlan_port.
2152  */
2153 void vxlan_get_rx_port(struct net_device *dev)
2154 {
2155         struct vxlan_sock *vs;
2156         struct net *net = dev_net(dev);
2157         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2158         sa_family_t sa_family;
2159         __be16 port;
2160         unsigned int i;
2161 
2162         spin_lock(&vn->sock_lock);
2163         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2164                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2165                         port = inet_sk(vs->sock->sk)->inet_sport;
2166                         sa_family = vs->sock->sk->sk_family;
2167                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2168                                                             port);
2169                 }
2170         }
2171         spin_unlock(&vn->sock_lock);
2172 }
2173 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2174 
2175 /* Initialize the device structure. */
2176 static void vxlan_setup(struct net_device *dev)
2177 {
2178         struct vxlan_dev *vxlan = netdev_priv(dev);
2179         unsigned int h;
2180 
2181         eth_hw_addr_random(dev);
2182         ether_setup(dev);
2183         if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2184                 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2185         else
2186                 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2187 
2188         dev->netdev_ops = &vxlan_netdev_ops;
2189         dev->destructor = free_netdev;
2190         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2191 
2192         dev->tx_queue_len = 0;
2193         dev->features   |= NETIF_F_LLTX;
2194         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2195         dev->features   |= NETIF_F_RXCSUM;
2196         dev->features   |= NETIF_F_GSO_SOFTWARE;
2197 
2198         dev->vlan_features = dev->features;
2199         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2200         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2201         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2202         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2203         netif_keep_dst(dev);
2204         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2205 
2206         INIT_LIST_HEAD(&vxlan->next);
2207         spin_lock_init(&vxlan->hash_lock);
2208         INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2209         INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2210         INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2211 
2212         init_timer_deferrable(&vxlan->age_timer);
2213         vxlan->age_timer.function = vxlan_cleanup;
2214         vxlan->age_timer.data = (unsigned long) vxlan;
2215 
2216         vxlan->dst_port = htons(vxlan_port);
2217 
2218         vxlan->dev = dev;
2219 
2220         for (h = 0; h < FDB_HASH_SIZE; ++h)
2221                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2222 }
2223 
2224 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2225         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2226         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2227         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2228         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2229         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2230         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2231         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2232         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2233         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2234         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2235         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2236         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2237         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2238         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2239         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2240         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2241         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2242         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2243         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2244         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2245 };
2246 
2247 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2248 {
2249         if (tb[IFLA_ADDRESS]) {
2250                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2251                         pr_debug("invalid link address (not ethernet)\n");
2252                         return -EINVAL;
2253                 }
2254 
2255                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2256                         pr_debug("invalid all zero ethernet address\n");
2257                         return -EADDRNOTAVAIL;
2258                 }
2259         }
2260 
2261         if (!data)
2262                 return -EINVAL;
2263 
2264         if (data[IFLA_VXLAN_ID]) {
2265                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2266                 if (id >= VXLAN_VID_MASK)
2267                         return -ERANGE;
2268         }
2269 
2270         if (data[IFLA_VXLAN_PORT_RANGE]) {
2271                 const struct ifla_vxlan_port_range *p
2272                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2273 
2274                 if (ntohs(p->high) < ntohs(p->low)) {
2275                         pr_debug("port range %u .. %u not valid\n",
2276                                  ntohs(p->low), ntohs(p->high));
2277                         return -EINVAL;
2278                 }
2279         }
2280 
2281         return 0;
2282 }
2283 
2284 static void vxlan_get_drvinfo(struct net_device *netdev,
2285                               struct ethtool_drvinfo *drvinfo)
2286 {
2287         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2288         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2289 }
2290 
2291 static const struct ethtool_ops vxlan_ethtool_ops = {
2292         .get_drvinfo    = vxlan_get_drvinfo,
2293         .get_link       = ethtool_op_get_link,
2294 };
2295 
2296 static void vxlan_del_work(struct work_struct *work)
2297 {
2298         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2299         udp_tunnel_sock_release(vs->sock);
2300         kfree_rcu(vs, rcu);
2301 }
2302 
2303 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2304                                         __be16 port, u32 flags)
2305 {
2306         struct socket *sock;
2307         struct udp_port_cfg udp_conf;
2308         int err;
2309 
2310         memset(&udp_conf, 0, sizeof(udp_conf));
2311 
2312         if (ipv6) {
2313                 udp_conf.family = AF_INET6;
2314                 udp_conf.use_udp6_tx_checksums =
2315                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2316                 udp_conf.use_udp6_rx_checksums =
2317                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2318         } else {
2319                 udp_conf.family = AF_INET;
2320                 udp_conf.local_ip.s_addr = INADDR_ANY;
2321                 udp_conf.use_udp_checksums =
2322                     !!(flags & VXLAN_F_UDP_CSUM);
2323         }
2324 
2325         udp_conf.local_udp_port = port;
2326 
2327         /* Open UDP socket */
2328         err = udp_sock_create(net, &udp_conf, &sock);
2329         if (err < 0)
2330                 return ERR_PTR(err);
2331 
2332         return sock;
2333 }
2334 
2335 /* Create new listen socket if needed */
2336 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2337                                               vxlan_rcv_t *rcv, void *data,
2338                                               u32 flags)
2339 {
2340         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2341         struct vxlan_sock *vs;
2342         struct socket *sock;
2343         unsigned int h;
2344         bool ipv6 = !!(flags & VXLAN_F_IPV6);
2345         struct udp_tunnel_sock_cfg tunnel_cfg;
2346 
2347         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2348         if (!vs)
2349                 return ERR_PTR(-ENOMEM);
2350 
2351         for (h = 0; h < VNI_HASH_SIZE; ++h)
2352                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2353 
2354         INIT_WORK(&vs->del_work, vxlan_del_work);
2355 
2356         sock = vxlan_create_sock(net, ipv6, port, flags);
2357         if (IS_ERR(sock)) {
2358                 kfree(vs);
2359                 return ERR_CAST(sock);
2360         }
2361 
2362         vs->sock = sock;
2363         atomic_set(&vs->refcnt, 1);
2364         vs->rcv = rcv;
2365         vs->data = data;
2366 
2367         /* Initialize the vxlan udp offloads structure */
2368         vs->udp_offloads.port = port;
2369         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2370         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2371 
2372         spin_lock(&vn->sock_lock);
2373         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2374         vxlan_notify_add_rx_port(vs);
2375         spin_unlock(&vn->sock_lock);
2376 
2377         /* Mark socket as an encapsulation socket. */
2378         tunnel_cfg.sk_user_data = vs;
2379         tunnel_cfg.encap_type = 1;
2380         tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2381         tunnel_cfg.encap_destroy = NULL;
2382 
2383         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2384 
2385         return vs;
2386 }
2387 
2388 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2389                                   vxlan_rcv_t *rcv, void *data,
2390                                   bool no_share, u32 flags)
2391 {
2392         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2393         struct vxlan_sock *vs;
2394         bool ipv6 = flags & VXLAN_F_IPV6;
2395 
2396         vs = vxlan_socket_create(net, port, rcv, data, flags);
2397         if (!IS_ERR(vs))
2398                 return vs;
2399 
2400         if (no_share)   /* Return error if sharing is not allowed. */
2401                 return vs;
2402 
2403         spin_lock(&vn->sock_lock);
2404         vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port);
2405         if (vs && ((vs->rcv != rcv) ||
2406                    !atomic_add_unless(&vs->refcnt, 1, 0)))
2407                         vs = ERR_PTR(-EBUSY);
2408         spin_unlock(&vn->sock_lock);
2409 
2410         if (!vs)
2411                 vs = ERR_PTR(-EINVAL);
2412 
2413         return vs;
2414 }
2415 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2416 
2417 /* Scheduled at device creation to bind to a socket */
2418 static void vxlan_sock_work(struct work_struct *work)
2419 {
2420         struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2421         struct net *net = vxlan->net;
2422         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2423         __be16 port = vxlan->dst_port;
2424         struct vxlan_sock *nvs;
2425 
2426         nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
2427         spin_lock(&vn->sock_lock);
2428         if (!IS_ERR(nvs))
2429                 vxlan_vs_add_dev(nvs, vxlan);
2430         spin_unlock(&vn->sock_lock);
2431 
2432         dev_put(vxlan->dev);
2433 }
2434 
2435 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2436                          struct nlattr *tb[], struct nlattr *data[])
2437 {
2438         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2439         struct vxlan_dev *vxlan = netdev_priv(dev);
2440         struct vxlan_rdst *dst = &vxlan->default_dst;
2441         __u32 vni;
2442         int err;
2443         bool use_ipv6 = false;
2444 
2445         if (!data[IFLA_VXLAN_ID])
2446                 return -EINVAL;
2447 
2448         vxlan->net = src_net;
2449 
2450         vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2451         dst->remote_vni = vni;
2452 
2453         /* Unless IPv6 is explicitly requested, assume IPv4 */
2454         dst->remote_ip.sa.sa_family = AF_INET;
2455         if (data[IFLA_VXLAN_GROUP]) {
2456                 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2457         } else if (data[IFLA_VXLAN_GROUP6]) {
2458                 if (!IS_ENABLED(CONFIG_IPV6))
2459                         return -EPFNOSUPPORT;
2460 
2461                 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2462                            sizeof(struct in6_addr));
2463                 dst->remote_ip.sa.sa_family = AF_INET6;
2464                 use_ipv6 = true;
2465         }
2466 
2467         if (data[IFLA_VXLAN_LOCAL]) {
2468                 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2469                 vxlan->saddr.sa.sa_family = AF_INET;
2470         } else if (data[IFLA_VXLAN_LOCAL6]) {
2471                 if (!IS_ENABLED(CONFIG_IPV6))
2472                         return -EPFNOSUPPORT;
2473 
2474                 /* TODO: respect scope id */
2475                 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2476                            sizeof(struct in6_addr));
2477                 vxlan->saddr.sa.sa_family = AF_INET6;
2478                 use_ipv6 = true;
2479         }
2480 
2481         if (data[IFLA_VXLAN_LINK] &&
2482             (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2483                 struct net_device *lowerdev
2484                          = __dev_get_by_index(src_net, dst->remote_ifindex);
2485 
2486                 if (!lowerdev) {
2487                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2488                         return -ENODEV;
2489                 }
2490 
2491 #if IS_ENABLED(CONFIG_IPV6)
2492                 if (use_ipv6) {
2493                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2494                         if (idev && idev->cnf.disable_ipv6) {
2495                                 pr_info("IPv6 is disabled via sysctl\n");
2496                                 return -EPERM;
2497                         }
2498                         vxlan->flags |= VXLAN_F_IPV6;
2499                 }
2500 #endif
2501 
2502                 if (!tb[IFLA_MTU])
2503                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2504 
2505                 dev->needed_headroom = lowerdev->hard_header_len +
2506                                        (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2507         } else if (use_ipv6)
2508                 vxlan->flags |= VXLAN_F_IPV6;
2509 
2510         if (data[IFLA_VXLAN_TOS])
2511                 vxlan->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2512 
2513         if (data[IFLA_VXLAN_TTL])
2514                 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2515 
2516         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2517                 vxlan->flags |= VXLAN_F_LEARN;
2518 
2519         if (data[IFLA_VXLAN_AGEING])
2520                 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2521         else
2522                 vxlan->age_interval = FDB_AGE_DEFAULT;
2523 
2524         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2525                 vxlan->flags |= VXLAN_F_PROXY;
2526 
2527         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2528                 vxlan->flags |= VXLAN_F_RSC;
2529 
2530         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2531                 vxlan->flags |= VXLAN_F_L2MISS;
2532 
2533         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2534                 vxlan->flags |= VXLAN_F_L3MISS;
2535 
2536         if (data[IFLA_VXLAN_LIMIT])
2537                 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2538 
2539         if (data[IFLA_VXLAN_PORT_RANGE]) {
2540                 const struct ifla_vxlan_port_range *p
2541                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2542                 vxlan->port_min = ntohs(p->low);
2543                 vxlan->port_max = ntohs(p->high);
2544         }
2545 
2546         if (data[IFLA_VXLAN_PORT])
2547                 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2548 
2549         if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2550                 vxlan->flags |= VXLAN_F_UDP_CSUM;
2551 
2552         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2553             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2554                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2555 
2556         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2557             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2558                 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2559 
2560         if (vxlan_find_vni(src_net, vni, use_ipv6 ? AF_INET6 : AF_INET,
2561                            vxlan->dst_port)) {
2562                 pr_info("duplicate VNI %u\n", vni);
2563                 return -EEXIST;
2564         }
2565 
2566         dev->ethtool_ops = &vxlan_ethtool_ops;
2567 
2568         /* create an fdb entry for a valid default destination */
2569         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2570                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2571                                        &vxlan->default_dst.remote_ip,
2572                                        NUD_REACHABLE|NUD_PERMANENT,
2573                                        NLM_F_EXCL|NLM_F_CREATE,
2574                                        vxlan->dst_port,
2575                                        vxlan->default_dst.remote_vni,
2576                                        vxlan->default_dst.remote_ifindex,
2577                                        NTF_SELF);
2578                 if (err)
2579                         return err;
2580         }
2581 
2582         err = register_netdevice(dev);
2583         if (err) {
2584                 vxlan_fdb_delete_default(vxlan);
2585                 return err;
2586         }
2587 
2588         list_add(&vxlan->next, &vn->vxlan_list);
2589 
2590         return 0;
2591 }
2592 
2593 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2594 {
2595         struct vxlan_dev *vxlan = netdev_priv(dev);
2596         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2597 
2598         spin_lock(&vn->sock_lock);
2599         if (!hlist_unhashed(&vxlan->hlist))
2600                 hlist_del_rcu(&vxlan->hlist);
2601         spin_unlock(&vn->sock_lock);
2602 
2603         list_del(&vxlan->next);
2604         unregister_netdevice_queue(dev, head);
2605 }
2606 
2607 static size_t vxlan_get_size(const struct net_device *dev)
2608 {
2609 
2610         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
2611                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2612                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2613                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2614                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
2615                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
2616                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
2617                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
2618                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
2619                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
2620                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
2621                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2622                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2623                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2624                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2625                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2626                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2627                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2628                 0;
2629 }
2630 
2631 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2632 {
2633         const struct vxlan_dev *vxlan = netdev_priv(dev);
2634         const struct vxlan_rdst *dst = &vxlan->default_dst;
2635         struct ifla_vxlan_port_range ports = {
2636                 .low =  htons(vxlan->port_min),
2637                 .high = htons(vxlan->port_max),
2638         };
2639 
2640         if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2641                 goto nla_put_failure;
2642 
2643         if (!vxlan_addr_any(&dst->remote_ip)) {
2644                 if (dst->remote_ip.sa.sa_family == AF_INET) {
2645                         if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2646                                          dst->remote_ip.sin.sin_addr.s_addr))
2647                                 goto nla_put_failure;
2648 #if IS_ENABLED(CONFIG_IPV6)
2649                 } else {
2650                         if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2651                                     &dst->remote_ip.sin6.sin6_addr))
2652                                 goto nla_put_failure;
2653 #endif
2654                 }
2655         }
2656 
2657         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2658                 goto nla_put_failure;
2659 
2660         if (!vxlan_addr_any(&vxlan->saddr)) {
2661                 if (vxlan->saddr.sa.sa_family == AF_INET) {
2662                         if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2663                                          vxlan->saddr.sin.sin_addr.s_addr))
2664                                 goto nla_put_failure;
2665 #if IS_ENABLED(CONFIG_IPV6)
2666                 } else {
2667                         if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2668                                     &vxlan->saddr.sin6.sin6_addr))
2669                                 goto nla_put_failure;
2670 #endif
2671                 }
2672         }
2673 
2674         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2675             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2676             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2677                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
2678             nla_put_u8(skb, IFLA_VXLAN_PROXY,
2679                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
2680             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2681             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2682                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2683             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2684                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2685             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2686             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2687             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2688             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2689                         !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2690             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2691                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2692             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2693                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)))
2694                 goto nla_put_failure;
2695 
2696         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2697                 goto nla_put_failure;
2698 
2699         return 0;
2700 
2701 nla_put_failure:
2702         return -EMSGSIZE;
2703 }
2704 
2705 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2706         .kind           = "vxlan",
2707         .maxtype        = IFLA_VXLAN_MAX,
2708         .policy         = vxlan_policy,
2709         .priv_size      = sizeof(struct vxlan_dev),
2710         .setup          = vxlan_setup,
2711         .validate       = vxlan_validate,
2712         .newlink        = vxlan_newlink,
2713         .dellink        = vxlan_dellink,
2714         .get_size       = vxlan_get_size,
2715         .fill_info      = vxlan_fill_info,
2716 };
2717 
2718 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2719                                              struct net_device *dev)
2720 {
2721         struct vxlan_dev *vxlan, *next;
2722         LIST_HEAD(list_kill);
2723 
2724         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2725                 struct vxlan_rdst *dst = &vxlan->default_dst;
2726 
2727                 /* In case we created vxlan device with carrier
2728                  * and we loose the carrier due to module unload
2729                  * we also need to remove vxlan device. In other
2730                  * cases, it's not necessary and remote_ifindex
2731                  * is 0 here, so no matches.
2732                  */
2733                 if (dst->remote_ifindex == dev->ifindex)
2734                         vxlan_dellink(vxlan->dev, &list_kill);
2735         }
2736 
2737         unregister_netdevice_many(&list_kill);
2738 }
2739 
2740 static int vxlan_lowerdev_event(struct notifier_block *unused,
2741                                 unsigned long event, void *ptr)
2742 {
2743         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2744         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2745 
2746         if (event == NETDEV_UNREGISTER)
2747                 vxlan_handle_lowerdev_unregister(vn, dev);
2748 
2749         return NOTIFY_DONE;
2750 }
2751 
2752 static struct notifier_block vxlan_notifier_block __read_mostly = {
2753         .notifier_call = vxlan_lowerdev_event,
2754 };
2755 
2756 static __net_init int vxlan_init_net(struct net *net)
2757 {
2758         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2759         unsigned int h;
2760 
2761         INIT_LIST_HEAD(&vn->vxlan_list);
2762         spin_lock_init(&vn->sock_lock);
2763 
2764         for (h = 0; h < PORT_HASH_SIZE; ++h)
2765                 INIT_HLIST_HEAD(&vn->sock_list[h]);
2766 
2767         return 0;
2768 }
2769 
2770 static void __net_exit vxlan_exit_net(struct net *net)
2771 {
2772         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2773         struct vxlan_dev *vxlan, *next;
2774         struct net_device *dev, *aux;
2775         LIST_HEAD(list);
2776 
2777         rtnl_lock();
2778         for_each_netdev_safe(net, dev, aux)
2779                 if (dev->rtnl_link_ops == &vxlan_link_ops)
2780                         unregister_netdevice_queue(dev, &list);
2781 
2782         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2783                 /* If vxlan->dev is in the same netns, it has already been added
2784                  * to the list by the previous loop.
2785                  */
2786                 if (!net_eq(dev_net(vxlan->dev), net))
2787                         unregister_netdevice_queue(dev, &list);
2788         }
2789 
2790         unregister_netdevice_many(&list);
2791         rtnl_unlock();
2792 }
2793 
2794 static struct pernet_operations vxlan_net_ops = {
2795         .init = vxlan_init_net,
2796         .exit = vxlan_exit_net,
2797         .id   = &vxlan_net_id,
2798         .size = sizeof(struct vxlan_net),
2799 };
2800 
2801 static int __init vxlan_init_module(void)
2802 {
2803         int rc;
2804 
2805         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2806         if (!vxlan_wq)
2807                 return -ENOMEM;
2808 
2809         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2810 
2811         rc = register_pernet_subsys(&vxlan_net_ops);
2812         if (rc)
2813                 goto out1;
2814 
2815         rc = register_netdevice_notifier(&vxlan_notifier_block);
2816         if (rc)
2817                 goto out2;
2818 
2819         rc = rtnl_link_register(&vxlan_link_ops);
2820         if (rc)
2821                 goto out3;
2822 
2823         return 0;
2824 out3:
2825         unregister_netdevice_notifier(&vxlan_notifier_block);
2826 out2:
2827         unregister_pernet_subsys(&vxlan_net_ops);
2828 out1:
2829         destroy_workqueue(vxlan_wq);
2830         return rc;
2831 }
2832 late_initcall(vxlan_init_module);
2833 
2834 static void __exit vxlan_cleanup_module(void)
2835 {
2836         rtnl_link_unregister(&vxlan_link_ops);
2837         unregister_netdevice_notifier(&vxlan_notifier_block);
2838         destroy_workqueue(vxlan_wq);
2839         unregister_pernet_subsys(&vxlan_net_ops);
2840         /* rcu_barrier() is called by netns */
2841 }
2842 module_exit(vxlan_cleanup_module);
2843 
2844 MODULE_LICENSE("GPL");
2845 MODULE_VERSION(VXLAN_VERSION);
2846 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
2847 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
2848 MODULE_ALIAS_RTNL_LINK("vxlan");
2849 

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