2 * VXLAN: Virtual eXtensible Local Area Network
4 * Copyright (c) 2012-2013 Vyatta Inc.
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.
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/udp.h>
18 #include <linux/igmp.h>
19 #include <linux/if_ether.h>
20 #include <linux/ethtool.h>
22 #include <net/ndisc.h>
25 #include <net/rtnetlink.h>
26 #include <net/inet_ecn.h>
27 #include <net/net_namespace.h>
28 #include <net/netns/generic.h>
29 #include <net/vxlan.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <net/ip6_tunnel.h>
33 #include <net/ip6_checksum.h>
36 #define VXLAN_VERSION "0.1"
38 #define PORT_HASH_BITS 8
39 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
40 #define FDB_AGE_DEFAULT 300 /* 5 min */
41 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
43 /* UDP port for VXLAN traffic.
44 * The IANA assigned port is 4789, but the Linux default is 8472
45 * for compatibility with early adopters.
47 static unsigned short vxlan_port __read_mostly = 8472;
48 module_param_named(udp_port, vxlan_port, ushort, 0444);
49 MODULE_PARM_DESC(udp_port, "Destination UDP port");
51 static bool log_ecn_error = true;
52 module_param(log_ecn_error, bool, 0644);
53 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
55 static unsigned int vxlan_net_id;
56 static struct rtnl_link_ops vxlan_link_ops;
58 static const u8 all_zeros_mac[ETH_ALEN + 2];
60 static int vxlan_sock_add(struct vxlan_dev *vxlan);
62 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
64 /* per-network namespace private data for this module */
66 struct list_head vxlan_list;
67 struct hlist_head sock_list[PORT_HASH_SIZE];
71 /* Forwarding table entry */
73 struct hlist_node hlist; /* linked list of entries */
75 unsigned long updated; /* jiffies */
77 struct list_head remotes;
78 u8 eth_addr[ETH_ALEN];
79 u16 state; /* see ndm_state */
81 u8 flags; /* see ndm_flags */
84 /* salt for hash table */
85 static u32 vxlan_salt __read_mostly;
87 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
89 return vs->flags & VXLAN_F_COLLECT_METADATA ||
90 ip_tunnel_collect_metadata();
93 #if IS_ENABLED(CONFIG_IPV6)
95 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
97 if (a->sa.sa_family != b->sa.sa_family)
99 if (a->sa.sa_family == AF_INET6)
100 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
102 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
105 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
107 if (ipa->sa.sa_family == AF_INET6)
108 return ipv6_addr_any(&ipa->sin6.sin6_addr);
110 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
113 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
115 if (ipa->sa.sa_family == AF_INET6)
116 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
118 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
121 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
123 if (nla_len(nla) >= sizeof(struct in6_addr)) {
124 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
125 ip->sa.sa_family = AF_INET6;
127 } else if (nla_len(nla) >= sizeof(__be32)) {
128 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
129 ip->sa.sa_family = AF_INET;
132 return -EAFNOSUPPORT;
136 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
137 const union vxlan_addr *ip)
139 if (ip->sa.sa_family == AF_INET6)
140 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
142 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
145 #else /* !CONFIG_IPV6 */
148 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
150 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
153 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
155 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
158 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
160 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
163 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
165 if (nla_len(nla) >= sizeof(struct in6_addr)) {
166 return -EAFNOSUPPORT;
167 } else if (nla_len(nla) >= sizeof(__be32)) {
168 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
169 ip->sa.sa_family = AF_INET;
172 return -EAFNOSUPPORT;
176 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
177 const union vxlan_addr *ip)
179 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
183 /* Virtual Network hash table head */
184 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
186 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
189 /* Socket hash table head */
190 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
192 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
194 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
197 /* First remote destination for a forwarding entry.
198 * Guaranteed to be non-NULL because remotes are never deleted.
200 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
202 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
205 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
207 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
210 /* Find VXLAN socket based on network namespace, address family and UDP port
211 * and enabled unshareable flags.
213 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
214 __be16 port, u32 flags)
216 struct vxlan_sock *vs;
218 flags &= VXLAN_F_RCV_FLAGS;
220 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
221 if (inet_sk(vs->sock->sk)->inet_sport == port &&
222 vxlan_get_sk_family(vs) == family &&
229 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
232 struct vxlan_dev_node *node;
234 /* For flow based devices, map all packets to VNI 0 */
235 if (vs->flags & VXLAN_F_COLLECT_METADATA)
238 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
239 if (node->vxlan->default_dst.remote_vni != vni)
242 if (IS_ENABLED(CONFIG_IPV6)) {
243 const struct vxlan_config *cfg = &node->vxlan->cfg;
245 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
246 cfg->remote_ifindex != ifindex)
256 /* Look up VNI in a per net namespace table */
257 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
258 __be32 vni, sa_family_t family,
259 __be16 port, u32 flags)
261 struct vxlan_sock *vs;
263 vs = vxlan_find_sock(net, family, port, flags);
267 return vxlan_vs_find_vni(vs, ifindex, vni);
270 /* Fill in neighbour message in skbuff. */
271 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
272 const struct vxlan_fdb *fdb,
273 u32 portid, u32 seq, int type, unsigned int flags,
274 const struct vxlan_rdst *rdst)
276 unsigned long now = jiffies;
277 struct nda_cacheinfo ci;
278 struct nlmsghdr *nlh;
280 bool send_ip, send_eth;
282 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
286 ndm = nlmsg_data(nlh);
287 memset(ndm, 0, sizeof(*ndm));
289 send_eth = send_ip = true;
291 if (type == RTM_GETNEIGH) {
292 send_ip = !vxlan_addr_any(&rdst->remote_ip);
293 send_eth = !is_zero_ether_addr(fdb->eth_addr);
294 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
296 ndm->ndm_family = AF_BRIDGE;
297 ndm->ndm_state = fdb->state;
298 ndm->ndm_ifindex = vxlan->dev->ifindex;
299 ndm->ndm_flags = fdb->flags;
300 ndm->ndm_type = RTN_UNICAST;
302 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
303 nla_put_s32(skb, NDA_LINK_NETNSID,
304 peernet2id(dev_net(vxlan->dev), vxlan->net)))
305 goto nla_put_failure;
307 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
308 goto nla_put_failure;
310 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
311 goto nla_put_failure;
313 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
314 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
315 goto nla_put_failure;
316 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
317 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
318 goto nla_put_failure;
319 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
320 nla_put_u32(skb, NDA_SRC_VNI,
321 be32_to_cpu(fdb->vni)))
322 goto nla_put_failure;
323 if (rdst->remote_ifindex &&
324 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
325 goto nla_put_failure;
327 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
328 ci.ndm_confirmed = 0;
329 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
332 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
333 goto nla_put_failure;
339 nlmsg_cancel(skb, nlh);
343 static inline size_t vxlan_nlmsg_size(void)
345 return NLMSG_ALIGN(sizeof(struct ndmsg))
346 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
347 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
348 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
349 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
350 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
351 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
352 + nla_total_size(sizeof(struct nda_cacheinfo));
355 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
356 struct vxlan_rdst *rd, int type)
358 struct net *net = dev_net(vxlan->dev);
362 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
366 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
368 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
369 WARN_ON(err == -EMSGSIZE);
374 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
378 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
381 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
383 struct vxlan_dev *vxlan = netdev_priv(dev);
384 struct vxlan_fdb f = {
387 struct vxlan_rdst remote = {
388 .remote_ip = *ipa, /* goes to NDA_DST */
389 .remote_vni = cpu_to_be32(VXLAN_N_VID),
392 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
395 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
397 struct vxlan_fdb f = {
400 struct vxlan_rdst remote = { };
402 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
404 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
407 /* Hash Ethernet address */
408 static u32 eth_hash(const unsigned char *addr)
410 u64 value = get_unaligned((u64 *)addr);
412 /* only want 6 bytes */
418 return hash_64(value, FDB_HASH_BITS);
421 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
423 /* use 1 byte of OUI and 3 bytes of NIC */
424 u32 key = get_unaligned((u32 *)(addr + 2));
426 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
429 /* Hash chain to use given mac address */
430 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
431 const u8 *mac, __be32 vni)
433 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
434 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
436 return &vxlan->fdb_head[eth_hash(mac)];
439 /* Look up Ethernet address in forwarding table */
440 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
441 const u8 *mac, __be32 vni)
443 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
446 hlist_for_each_entry_rcu(f, head, hlist) {
447 if (ether_addr_equal(mac, f->eth_addr)) {
448 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
460 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
461 const u8 *mac, __be32 vni)
465 f = __vxlan_find_mac(vxlan, mac, vni);
472 /* caller should hold vxlan->hash_lock */
473 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
474 union vxlan_addr *ip, __be16 port,
475 __be32 vni, __u32 ifindex)
477 struct vxlan_rdst *rd;
479 list_for_each_entry(rd, &f->remotes, list) {
480 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
481 rd->remote_port == port &&
482 rd->remote_vni == vni &&
483 rd->remote_ifindex == ifindex)
490 /* Replace destination of unicast mac */
491 static int vxlan_fdb_replace(struct vxlan_fdb *f,
492 union vxlan_addr *ip, __be16 port, __be32 vni,
495 struct vxlan_rdst *rd;
497 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
501 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
505 dst_cache_reset(&rd->dst_cache);
507 rd->remote_port = port;
508 rd->remote_vni = vni;
509 rd->remote_ifindex = ifindex;
513 /* Add/update destinations for multicast */
514 static int vxlan_fdb_append(struct vxlan_fdb *f,
515 union vxlan_addr *ip, __be16 port, __be32 vni,
516 __u32 ifindex, struct vxlan_rdst **rdp)
518 struct vxlan_rdst *rd;
520 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
524 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
528 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
534 rd->remote_port = port;
535 rd->remote_vni = vni;
536 rd->remote_ifindex = ifindex;
538 list_add_tail_rcu(&rd->list, &f->remotes);
544 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
546 struct vxlanhdr *vh, size_t hdrlen,
548 struct gro_remcsum *grc,
551 size_t start, offset;
553 if (skb->remcsum_offload)
556 if (!NAPI_GRO_CB(skb)->csum_valid)
559 start = vxlan_rco_start(vni_field);
560 offset = start + vxlan_rco_offset(vni_field);
562 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
563 start, offset, grc, nopartial);
565 skb->remcsum_offload = 1;
570 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
571 struct sk_buff **head,
574 struct sk_buff *p, **pp = NULL;
575 struct vxlanhdr *vh, *vh2;
576 unsigned int hlen, off_vx;
578 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
580 struct gro_remcsum grc;
582 skb_gro_remcsum_init(&grc);
584 off_vx = skb_gro_offset(skb);
585 hlen = off_vx + sizeof(*vh);
586 vh = skb_gro_header_fast(skb, off_vx);
587 if (skb_gro_header_hard(skb, hlen)) {
588 vh = skb_gro_header_slow(skb, hlen, off_vx);
593 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
595 flags = vh->vx_flags;
597 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
598 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
601 VXLAN_F_REMCSUM_NOPARTIAL));
607 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
609 for (p = *head; p; p = p->next) {
610 if (!NAPI_GRO_CB(p)->same_flow)
613 vh2 = (struct vxlanhdr *)(p->data + off_vx);
614 if (vh->vx_flags != vh2->vx_flags ||
615 vh->vx_vni != vh2->vx_vni) {
616 NAPI_GRO_CB(p)->same_flow = 0;
621 pp = call_gro_receive(eth_gro_receive, head, skb);
625 skb_gro_remcsum_cleanup(skb, &grc);
626 skb->remcsum_offload = 0;
627 NAPI_GRO_CB(skb)->flush |= flush;
632 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
634 /* Sets 'skb->inner_mac_header' since we are always called with
635 * 'skb->encapsulation' set.
637 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
640 /* Add new entry to forwarding table -- assumes lock held */
641 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
642 const u8 *mac, union vxlan_addr *ip,
643 __u16 state, __u16 flags,
644 __be16 port, __be32 src_vni, __be32 vni,
645 __u32 ifindex, __u8 ndm_flags)
647 struct vxlan_rdst *rd = NULL;
652 f = __vxlan_find_mac(vxlan, mac, src_vni);
654 if (flags & NLM_F_EXCL) {
655 netdev_dbg(vxlan->dev,
656 "lost race to create %pM\n", mac);
659 if (f->state != state) {
661 f->updated = jiffies;
664 if (f->flags != ndm_flags) {
665 f->flags = ndm_flags;
666 f->updated = jiffies;
669 if ((flags & NLM_F_REPLACE)) {
670 /* Only change unicasts */
671 if (!(is_multicast_ether_addr(f->eth_addr) ||
672 is_zero_ether_addr(f->eth_addr))) {
673 notify |= vxlan_fdb_replace(f, ip, port, vni,
678 if ((flags & NLM_F_APPEND) &&
679 (is_multicast_ether_addr(f->eth_addr) ||
680 is_zero_ether_addr(f->eth_addr))) {
681 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
688 if (!(flags & NLM_F_CREATE))
691 if (vxlan->cfg.addrmax &&
692 vxlan->addrcnt >= vxlan->cfg.addrmax)
695 /* Disallow replace to add a multicast entry */
696 if ((flags & NLM_F_REPLACE) &&
697 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
700 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
701 f = kmalloc(sizeof(*f), GFP_ATOMIC);
707 f->flags = ndm_flags;
708 f->updated = f->used = jiffies;
710 INIT_LIST_HEAD(&f->remotes);
711 memcpy(f->eth_addr, mac, ETH_ALEN);
713 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
720 hlist_add_head_rcu(&f->hlist,
721 vxlan_fdb_head(vxlan, mac, src_vni));
726 rd = first_remote_rtnl(f);
727 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
733 static void vxlan_fdb_free(struct rcu_head *head)
735 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
736 struct vxlan_rdst *rd, *nd;
738 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
739 dst_cache_destroy(&rd->dst_cache);
745 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
747 netdev_dbg(vxlan->dev,
748 "delete %pM\n", f->eth_addr);
751 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
753 hlist_del_rcu(&f->hlist);
754 call_rcu(&f->rcu, vxlan_fdb_free);
757 static void vxlan_dst_free(struct rcu_head *head)
759 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
761 dst_cache_destroy(&rd->dst_cache);
765 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
766 struct vxlan_rdst *rd)
768 list_del_rcu(&rd->list);
769 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
770 call_rcu(&rd->rcu, vxlan_dst_free);
773 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
774 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
775 __be32 *vni, u32 *ifindex)
777 struct net *net = dev_net(vxlan->dev);
781 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
785 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
786 if (remote->sa.sa_family == AF_INET) {
787 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
788 ip->sa.sa_family = AF_INET;
789 #if IS_ENABLED(CONFIG_IPV6)
791 ip->sin6.sin6_addr = in6addr_any;
792 ip->sa.sa_family = AF_INET6;
798 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
800 *port = nla_get_be16(tb[NDA_PORT]);
802 *port = vxlan->cfg.dst_port;
806 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
808 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
810 *vni = vxlan->default_dst.remote_vni;
813 if (tb[NDA_SRC_VNI]) {
814 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
816 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
818 *src_vni = vxlan->default_dst.remote_vni;
821 if (tb[NDA_IFINDEX]) {
822 struct net_device *tdev;
824 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
826 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
827 tdev = __dev_get_by_index(net, *ifindex);
829 return -EADDRNOTAVAIL;
837 /* Add static entry (via netlink) */
838 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
839 struct net_device *dev,
840 const unsigned char *addr, u16 vid, u16 flags)
842 struct vxlan_dev *vxlan = netdev_priv(dev);
843 /* struct net *net = dev_net(vxlan->dev); */
850 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
851 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
856 if (tb[NDA_DST] == NULL)
859 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
863 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
864 return -EAFNOSUPPORT;
866 spin_lock_bh(&vxlan->hash_lock);
867 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
868 port, src_vni, vni, ifindex, ndm->ndm_flags);
869 spin_unlock_bh(&vxlan->hash_lock);
874 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
875 const unsigned char *addr, union vxlan_addr ip,
876 __be16 port, __be32 src_vni, u32 vni, u32 ifindex,
880 struct vxlan_rdst *rd = NULL;
883 f = vxlan_find_mac(vxlan, addr, src_vni);
887 if (!vxlan_addr_any(&ip)) {
888 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
893 /* remove a destination if it's not the only one on the list,
894 * otherwise destroy the fdb entry
896 if (rd && !list_is_singular(&f->remotes)) {
897 vxlan_fdb_dst_destroy(vxlan, f, rd);
901 vxlan_fdb_destroy(vxlan, f);
907 /* Delete entry (via netlink) */
908 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
909 struct net_device *dev,
910 const unsigned char *addr, u16 vid)
912 struct vxlan_dev *vxlan = netdev_priv(dev);
919 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
923 spin_lock_bh(&vxlan->hash_lock);
924 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
926 spin_unlock_bh(&vxlan->hash_lock);
931 /* Dump forwarding table */
932 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
933 struct net_device *dev,
934 struct net_device *filter_dev, int *idx)
936 struct vxlan_dev *vxlan = netdev_priv(dev);
940 for (h = 0; h < FDB_HASH_SIZE; ++h) {
943 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
944 struct vxlan_rdst *rd;
946 list_for_each_entry_rcu(rd, &f->remotes, list) {
947 if (*idx < cb->args[2])
950 err = vxlan_fdb_info(skb, vxlan, f,
951 NETLINK_CB(cb->skb).portid,
966 /* Watch incoming packets to learn mapping between Ethernet address
967 * and Tunnel endpoint.
968 * Return true if packet is bogus and should be dropped.
970 static bool vxlan_snoop(struct net_device *dev,
971 union vxlan_addr *src_ip, const u8 *src_mac,
972 u32 src_ifindex, __be32 vni)
974 struct vxlan_dev *vxlan = netdev_priv(dev);
978 #if IS_ENABLED(CONFIG_IPV6)
979 if (src_ip->sa.sa_family == AF_INET6 &&
980 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
981 ifindex = src_ifindex;
984 f = vxlan_find_mac(vxlan, src_mac, vni);
986 struct vxlan_rdst *rdst = first_remote_rcu(f);
988 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
989 rdst->remote_ifindex == ifindex))
992 /* Don't migrate static entries, drop packets */
993 if (f->state & (NUD_PERMANENT | NUD_NOARP))
998 "%pM migrated from %pIS to %pIS\n",
999 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1001 rdst->remote_ip = *src_ip;
1002 f->updated = jiffies;
1003 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1005 /* learned new entry */
1006 spin_lock(&vxlan->hash_lock);
1008 /* close off race between vxlan_flush and incoming packets */
1009 if (netif_running(dev))
1010 vxlan_fdb_create(vxlan, src_mac, src_ip,
1012 NLM_F_EXCL|NLM_F_CREATE,
1013 vxlan->cfg.dst_port,
1015 vxlan->default_dst.remote_vni,
1017 spin_unlock(&vxlan->hash_lock);
1023 /* See if multicast group is already in use by other ID */
1024 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1026 struct vxlan_dev *vxlan;
1027 struct vxlan_sock *sock4;
1028 #if IS_ENABLED(CONFIG_IPV6)
1029 struct vxlan_sock *sock6;
1031 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1033 sock4 = rtnl_dereference(dev->vn4_sock);
1035 /* The vxlan_sock is only used by dev, leaving group has
1036 * no effect on other vxlan devices.
1038 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1040 #if IS_ENABLED(CONFIG_IPV6)
1041 sock6 = rtnl_dereference(dev->vn6_sock);
1042 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1046 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1047 if (!netif_running(vxlan->dev) || vxlan == dev)
1050 if (family == AF_INET &&
1051 rtnl_dereference(vxlan->vn4_sock) != sock4)
1053 #if IS_ENABLED(CONFIG_IPV6)
1054 if (family == AF_INET6 &&
1055 rtnl_dereference(vxlan->vn6_sock) != sock6)
1059 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1060 &dev->default_dst.remote_ip))
1063 if (vxlan->default_dst.remote_ifindex !=
1064 dev->default_dst.remote_ifindex)
1073 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1075 struct vxlan_net *vn;
1079 if (!refcount_dec_and_test(&vs->refcnt))
1082 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1083 spin_lock(&vn->sock_lock);
1084 hlist_del_rcu(&vs->hlist);
1085 udp_tunnel_notify_del_rx_port(vs->sock,
1086 (vs->flags & VXLAN_F_GPE) ?
1087 UDP_TUNNEL_TYPE_VXLAN_GPE :
1088 UDP_TUNNEL_TYPE_VXLAN);
1089 spin_unlock(&vn->sock_lock);
1094 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1096 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1097 #if IS_ENABLED(CONFIG_IPV6)
1098 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1100 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1103 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1106 vxlan_vs_del_dev(vxlan);
1108 if (__vxlan_sock_release_prep(sock4)) {
1109 udp_tunnel_sock_release(sock4->sock);
1113 #if IS_ENABLED(CONFIG_IPV6)
1114 if (__vxlan_sock_release_prep(sock6)) {
1115 udp_tunnel_sock_release(sock6->sock);
1121 /* Update multicast group membership when first VNI on
1122 * multicast address is brought up
1124 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1127 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1128 int ifindex = vxlan->default_dst.remote_ifindex;
1131 if (ip->sa.sa_family == AF_INET) {
1132 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1133 struct ip_mreqn mreq = {
1134 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1135 .imr_ifindex = ifindex,
1138 sk = sock4->sock->sk;
1140 ret = ip_mc_join_group(sk, &mreq);
1142 #if IS_ENABLED(CONFIG_IPV6)
1144 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1146 sk = sock6->sock->sk;
1148 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1149 &ip->sin6.sin6_addr);
1157 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1158 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1161 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1162 int ifindex = vxlan->default_dst.remote_ifindex;
1165 if (ip->sa.sa_family == AF_INET) {
1166 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1167 struct ip_mreqn mreq = {
1168 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1169 .imr_ifindex = ifindex,
1172 sk = sock4->sock->sk;
1174 ret = ip_mc_leave_group(sk, &mreq);
1176 #if IS_ENABLED(CONFIG_IPV6)
1178 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1180 sk = sock6->sock->sk;
1182 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1183 &ip->sin6.sin6_addr);
1191 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1192 struct sk_buff *skb, u32 vxflags)
1194 size_t start, offset;
1196 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1199 start = vxlan_rco_start(unparsed->vx_vni);
1200 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1202 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1205 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1206 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1208 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1209 unparsed->vx_vni &= VXLAN_VNI_MASK;
1213 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1214 struct sk_buff *skb, u32 vxflags,
1215 struct vxlan_metadata *md)
1217 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1218 struct metadata_dst *tun_dst;
1220 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1223 md->gbp = ntohs(gbp->policy_id);
1225 tun_dst = (struct metadata_dst *)skb_dst(skb);
1227 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1228 tun_dst->u.tun_info.options_len = sizeof(*md);
1230 if (gbp->dont_learn)
1231 md->gbp |= VXLAN_GBP_DONT_LEARN;
1233 if (gbp->policy_applied)
1234 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1236 /* In flow-based mode, GBP is carried in dst_metadata */
1237 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1238 skb->mark = md->gbp;
1240 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1243 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1245 struct sk_buff *skb, u32 vxflags)
1247 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1249 /* Need to have Next Protocol set for interfaces in GPE mode. */
1250 if (!gpe->np_applied)
1252 /* "The initial version is 0. If a receiver does not support the
1253 * version indicated it MUST drop the packet.
1255 if (gpe->version != 0)
1257 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1258 * processing MUST occur." However, we don't implement OAM
1259 * processing, thus drop the packet.
1264 switch (gpe->next_protocol) {
1265 case VXLAN_GPE_NP_IPV4:
1266 *protocol = htons(ETH_P_IP);
1268 case VXLAN_GPE_NP_IPV6:
1269 *protocol = htons(ETH_P_IPV6);
1271 case VXLAN_GPE_NP_ETHERNET:
1272 *protocol = htons(ETH_P_TEB);
1278 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1282 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1283 struct vxlan_sock *vs,
1284 struct sk_buff *skb, __be32 vni)
1286 union vxlan_addr saddr;
1287 u32 ifindex = skb->dev->ifindex;
1289 skb_reset_mac_header(skb);
1290 skb->protocol = eth_type_trans(skb, vxlan->dev);
1291 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1293 /* Ignore packet loops (and multicast echo) */
1294 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1297 /* Get address from the outer IP header */
1298 if (vxlan_get_sk_family(vs) == AF_INET) {
1299 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1300 saddr.sa.sa_family = AF_INET;
1301 #if IS_ENABLED(CONFIG_IPV6)
1303 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1304 saddr.sa.sa_family = AF_INET6;
1308 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1309 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1315 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1316 struct sk_buff *skb)
1320 if (vxlan_get_sk_family(vs) == AF_INET)
1321 err = IP_ECN_decapsulate(oiph, skb);
1322 #if IS_ENABLED(CONFIG_IPV6)
1324 err = IP6_ECN_decapsulate(oiph, skb);
1327 if (unlikely(err) && log_ecn_error) {
1328 if (vxlan_get_sk_family(vs) == AF_INET)
1329 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1330 &((struct iphdr *)oiph)->saddr,
1331 ((struct iphdr *)oiph)->tos);
1333 net_info_ratelimited("non-ECT from %pI6\n",
1334 &((struct ipv6hdr *)oiph)->saddr);
1339 /* Callback from net/ipv4/udp.c to receive packets */
1340 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1342 struct pcpu_sw_netstats *stats;
1343 struct vxlan_dev *vxlan;
1344 struct vxlan_sock *vs;
1345 struct vxlanhdr unparsed;
1346 struct vxlan_metadata _md;
1347 struct vxlan_metadata *md = &_md;
1348 __be16 protocol = htons(ETH_P_TEB);
1349 bool raw_proto = false;
1353 /* Need UDP and VXLAN header to be present */
1354 if (!pskb_may_pull(skb, VXLAN_HLEN))
1357 unparsed = *vxlan_hdr(skb);
1358 /* VNI flag always required to be set */
1359 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1360 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1361 ntohl(vxlan_hdr(skb)->vx_flags),
1362 ntohl(vxlan_hdr(skb)->vx_vni));
1363 /* Return non vxlan pkt */
1366 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1367 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1369 vs = rcu_dereference_sk_user_data(sk);
1373 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1375 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1379 /* For backwards compatibility, only allow reserved fields to be
1380 * used by VXLAN extensions if explicitly requested.
1382 if (vs->flags & VXLAN_F_GPE) {
1383 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1388 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1389 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1392 if (vxlan_collect_metadata(vs)) {
1393 struct metadata_dst *tun_dst;
1395 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1396 key32_to_tunnel_id(vni), sizeof(*md));
1401 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1403 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1405 memset(md, 0, sizeof(*md));
1408 if (vs->flags & VXLAN_F_REMCSUM_RX)
1409 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1411 if (vs->flags & VXLAN_F_GBP)
1412 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1413 /* Note that GBP and GPE can never be active together. This is
1414 * ensured in vxlan_dev_configure.
1417 if (unparsed.vx_flags || unparsed.vx_vni) {
1418 /* If there are any unprocessed flags remaining treat
1419 * this as a malformed packet. This behavior diverges from
1420 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1421 * in reserved fields are to be ignored. The approach here
1422 * maintains compatibility with previous stack code, and also
1423 * is more robust and provides a little more security in
1424 * adding extensions to VXLAN.
1430 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1433 skb_reset_mac_header(skb);
1434 skb->dev = vxlan->dev;
1435 skb->pkt_type = PACKET_HOST;
1438 oiph = skb_network_header(skb);
1439 skb_reset_network_header(skb);
1441 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1442 ++vxlan->dev->stats.rx_frame_errors;
1443 ++vxlan->dev->stats.rx_errors;
1447 stats = this_cpu_ptr(vxlan->dev->tstats);
1448 u64_stats_update_begin(&stats->syncp);
1449 stats->rx_packets++;
1450 stats->rx_bytes += skb->len;
1451 u64_stats_update_end(&stats->syncp);
1453 gro_cells_receive(&vxlan->gro_cells, skb);
1457 /* Consume bad packet */
1462 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1464 struct vxlan_dev *vxlan = netdev_priv(dev);
1465 struct arphdr *parp;
1468 struct neighbour *n;
1470 if (dev->flags & IFF_NOARP)
1473 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1474 dev->stats.tx_dropped++;
1477 parp = arp_hdr(skb);
1479 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1480 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1481 parp->ar_pro != htons(ETH_P_IP) ||
1482 parp->ar_op != htons(ARPOP_REQUEST) ||
1483 parp->ar_hln != dev->addr_len ||
1486 arpptr = (u8 *)parp + sizeof(struct arphdr);
1488 arpptr += dev->addr_len; /* sha */
1489 memcpy(&sip, arpptr, sizeof(sip));
1490 arpptr += sizeof(sip);
1491 arpptr += dev->addr_len; /* tha */
1492 memcpy(&tip, arpptr, sizeof(tip));
1494 if (ipv4_is_loopback(tip) ||
1495 ipv4_is_multicast(tip))
1498 n = neigh_lookup(&arp_tbl, &tip, dev);
1501 struct vxlan_fdb *f;
1502 struct sk_buff *reply;
1504 if (!(n->nud_state & NUD_CONNECTED)) {
1509 f = vxlan_find_mac(vxlan, n->ha, vni);
1510 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1511 /* bridge-local neighbor */
1516 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1524 skb_reset_mac_header(reply);
1525 __skb_pull(reply, skb_network_offset(reply));
1526 reply->ip_summed = CHECKSUM_UNNECESSARY;
1527 reply->pkt_type = PACKET_HOST;
1529 if (netif_rx_ni(reply) == NET_RX_DROP)
1530 dev->stats.rx_dropped++;
1531 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1532 union vxlan_addr ipa = {
1533 .sin.sin_addr.s_addr = tip,
1534 .sin.sin_family = AF_INET,
1537 vxlan_ip_miss(dev, &ipa);
1541 return NETDEV_TX_OK;
1544 #if IS_ENABLED(CONFIG_IPV6)
1545 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1546 struct neighbour *n, bool isrouter)
1548 struct net_device *dev = request->dev;
1549 struct sk_buff *reply;
1550 struct nd_msg *ns, *na;
1551 struct ipv6hdr *pip6;
1553 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1557 if (dev == NULL || !pskb_may_pull(request, request->len))
1560 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1561 sizeof(*na) + na_olen + dev->needed_tailroom;
1562 reply = alloc_skb(len, GFP_ATOMIC);
1566 reply->protocol = htons(ETH_P_IPV6);
1568 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1569 skb_push(reply, sizeof(struct ethhdr));
1570 skb_reset_mac_header(reply);
1572 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1574 daddr = eth_hdr(request)->h_source;
1575 ns_olen = request->len - skb_network_offset(request) -
1576 sizeof(struct ipv6hdr) - sizeof(*ns);
1577 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1578 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1579 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1584 /* Ethernet header */
1585 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1586 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1587 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1588 reply->protocol = htons(ETH_P_IPV6);
1590 skb_pull(reply, sizeof(struct ethhdr));
1591 skb_reset_network_header(reply);
1592 skb_put(reply, sizeof(struct ipv6hdr));
1596 pip6 = ipv6_hdr(reply);
1597 memset(pip6, 0, sizeof(struct ipv6hdr));
1599 pip6->priority = ipv6_hdr(request)->priority;
1600 pip6->nexthdr = IPPROTO_ICMPV6;
1601 pip6->hop_limit = 255;
1602 pip6->daddr = ipv6_hdr(request)->saddr;
1603 pip6->saddr = *(struct in6_addr *)n->primary_key;
1605 skb_pull(reply, sizeof(struct ipv6hdr));
1606 skb_reset_transport_header(reply);
1608 /* Neighbor Advertisement */
1609 na = skb_put_zero(reply, sizeof(*na) + na_olen);
1610 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1611 na->icmph.icmp6_router = isrouter;
1612 na->icmph.icmp6_override = 1;
1613 na->icmph.icmp6_solicited = 1;
1614 na->target = ns->target;
1615 ether_addr_copy(&na->opt[2], n->ha);
1616 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1617 na->opt[1] = na_olen >> 3;
1619 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1620 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1621 csum_partial(na, sizeof(*na)+na_olen, 0));
1623 pip6->payload_len = htons(sizeof(*na)+na_olen);
1625 skb_push(reply, sizeof(struct ipv6hdr));
1627 reply->ip_summed = CHECKSUM_UNNECESSARY;
1632 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1634 struct vxlan_dev *vxlan = netdev_priv(dev);
1636 const struct ipv6hdr *iphdr;
1637 const struct in6_addr *daddr;
1638 struct neighbour *n;
1639 struct inet6_dev *in6_dev;
1641 in6_dev = __in6_dev_get(dev);
1645 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + sizeof(struct nd_msg)))
1648 iphdr = ipv6_hdr(skb);
1649 daddr = &iphdr->daddr;
1651 msg = (struct nd_msg *)(iphdr + 1);
1652 if (msg->icmph.icmp6_code != 0 ||
1653 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1656 if (ipv6_addr_loopback(daddr) ||
1657 ipv6_addr_is_multicast(&msg->target))
1660 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1663 struct vxlan_fdb *f;
1664 struct sk_buff *reply;
1666 if (!(n->nud_state & NUD_CONNECTED)) {
1671 f = vxlan_find_mac(vxlan, n->ha, vni);
1672 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1673 /* bridge-local neighbor */
1678 reply = vxlan_na_create(skb, n,
1679 !!(f ? f->flags & NTF_ROUTER : 0));
1686 if (netif_rx_ni(reply) == NET_RX_DROP)
1687 dev->stats.rx_dropped++;
1689 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1690 union vxlan_addr ipa = {
1691 .sin6.sin6_addr = msg->target,
1692 .sin6.sin6_family = AF_INET6,
1695 vxlan_ip_miss(dev, &ipa);
1700 return NETDEV_TX_OK;
1704 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1706 struct vxlan_dev *vxlan = netdev_priv(dev);
1707 struct neighbour *n;
1709 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1713 switch (ntohs(eth_hdr(skb)->h_proto)) {
1718 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1721 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1722 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1723 union vxlan_addr ipa = {
1724 .sin.sin_addr.s_addr = pip->daddr,
1725 .sin.sin_family = AF_INET,
1728 vxlan_ip_miss(dev, &ipa);
1734 #if IS_ENABLED(CONFIG_IPV6)
1737 struct ipv6hdr *pip6;
1739 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1741 pip6 = ipv6_hdr(skb);
1742 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1743 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1744 union vxlan_addr ipa = {
1745 .sin6.sin6_addr = pip6->daddr,
1746 .sin6.sin6_family = AF_INET6,
1749 vxlan_ip_miss(dev, &ipa);
1763 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1765 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1767 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1776 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1777 struct vxlan_metadata *md)
1779 struct vxlanhdr_gbp *gbp;
1784 gbp = (struct vxlanhdr_gbp *)vxh;
1785 vxh->vx_flags |= VXLAN_HF_GBP;
1787 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1788 gbp->dont_learn = 1;
1790 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1791 gbp->policy_applied = 1;
1793 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1796 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1799 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1801 gpe->np_applied = 1;
1804 case htons(ETH_P_IP):
1805 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1807 case htons(ETH_P_IPV6):
1808 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1810 case htons(ETH_P_TEB):
1811 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1814 return -EPFNOSUPPORT;
1817 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1818 int iphdr_len, __be32 vni,
1819 struct vxlan_metadata *md, u32 vxflags,
1822 struct vxlanhdr *vxh;
1825 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1826 __be16 inner_protocol = htons(ETH_P_TEB);
1828 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1829 skb->ip_summed == CHECKSUM_PARTIAL) {
1830 int csum_start = skb_checksum_start_offset(skb);
1832 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1833 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1834 (skb->csum_offset == offsetof(struct udphdr, check) ||
1835 skb->csum_offset == offsetof(struct tcphdr, check)))
1836 type |= SKB_GSO_TUNNEL_REMCSUM;
1839 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1840 + VXLAN_HLEN + iphdr_len;
1842 /* Need space for new headers (invalidates iph ptr) */
1843 err = skb_cow_head(skb, min_headroom);
1847 err = iptunnel_handle_offloads(skb, type);
1851 vxh = __skb_push(skb, sizeof(*vxh));
1852 vxh->vx_flags = VXLAN_HF_VNI;
1853 vxh->vx_vni = vxlan_vni_field(vni);
1855 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1858 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1859 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1860 vxh->vx_flags |= VXLAN_HF_RCO;
1862 if (!skb_is_gso(skb)) {
1863 skb->ip_summed = CHECKSUM_NONE;
1864 skb->encapsulation = 0;
1868 if (vxflags & VXLAN_F_GBP)
1869 vxlan_build_gbp_hdr(vxh, vxflags, md);
1870 if (vxflags & VXLAN_F_GPE) {
1871 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1874 inner_protocol = skb->protocol;
1877 skb_set_inner_protocol(skb, inner_protocol);
1881 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1882 struct vxlan_sock *sock4,
1883 struct sk_buff *skb, int oif, u8 tos,
1884 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1885 struct dst_cache *dst_cache,
1886 const struct ip_tunnel_info *info)
1888 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1889 struct rtable *rt = NULL;
1893 return ERR_PTR(-EIO);
1898 rt = dst_cache_get_ip4(dst_cache, saddr);
1903 memset(&fl4, 0, sizeof(fl4));
1904 fl4.flowi4_oif = oif;
1905 fl4.flowi4_tos = RT_TOS(tos);
1906 fl4.flowi4_mark = skb->mark;
1907 fl4.flowi4_proto = IPPROTO_UDP;
1910 fl4.fl4_dport = dport;
1911 fl4.fl4_sport = sport;
1913 rt = ip_route_output_key(vxlan->net, &fl4);
1914 if (likely(!IS_ERR(rt))) {
1915 if (rt->dst.dev == dev) {
1916 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1918 return ERR_PTR(-ELOOP);
1923 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1925 netdev_dbg(dev, "no route to %pI4\n", &daddr);
1926 return ERR_PTR(-ENETUNREACH);
1931 #if IS_ENABLED(CONFIG_IPV6)
1932 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1933 struct net_device *dev,
1934 struct vxlan_sock *sock6,
1935 struct sk_buff *skb, int oif, u8 tos,
1937 const struct in6_addr *daddr,
1938 struct in6_addr *saddr,
1939 __be16 dport, __be16 sport,
1940 struct dst_cache *dst_cache,
1941 const struct ip_tunnel_info *info)
1943 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1944 struct dst_entry *ndst;
1949 return ERR_PTR(-EIO);
1954 ndst = dst_cache_get_ip6(dst_cache, saddr);
1959 memset(&fl6, 0, sizeof(fl6));
1960 fl6.flowi6_oif = oif;
1963 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1964 fl6.flowi6_mark = skb->mark;
1965 fl6.flowi6_proto = IPPROTO_UDP;
1966 fl6.fl6_dport = dport;
1967 fl6.fl6_sport = sport;
1969 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1972 if (unlikely(err < 0)) {
1973 netdev_dbg(dev, "no route to %pI6\n", daddr);
1974 return ERR_PTR(-ENETUNREACH);
1977 if (unlikely(ndst->dev == dev)) {
1978 netdev_dbg(dev, "circular route to %pI6\n", daddr);
1980 return ERR_PTR(-ELOOP);
1985 dst_cache_set_ip6(dst_cache, ndst, saddr);
1990 /* Bypass encapsulation if the destination is local */
1991 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1992 struct vxlan_dev *dst_vxlan, __be32 vni)
1994 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1995 union vxlan_addr loopback;
1996 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1997 struct net_device *dev = skb->dev;
2000 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2001 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2002 skb->pkt_type = PACKET_HOST;
2003 skb->encapsulation = 0;
2004 skb->dev = dst_vxlan->dev;
2005 __skb_pull(skb, skb_network_offset(skb));
2007 if (remote_ip->sa.sa_family == AF_INET) {
2008 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2009 loopback.sa.sa_family = AF_INET;
2010 #if IS_ENABLED(CONFIG_IPV6)
2012 loopback.sin6.sin6_addr = in6addr_loopback;
2013 loopback.sa.sa_family = AF_INET6;
2017 if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2018 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source, 0,
2021 u64_stats_update_begin(&tx_stats->syncp);
2022 tx_stats->tx_packets++;
2023 tx_stats->tx_bytes += len;
2024 u64_stats_update_end(&tx_stats->syncp);
2026 if (netif_rx(skb) == NET_RX_SUCCESS) {
2027 u64_stats_update_begin(&rx_stats->syncp);
2028 rx_stats->rx_packets++;
2029 rx_stats->rx_bytes += len;
2030 u64_stats_update_end(&rx_stats->syncp);
2032 dev->stats.rx_dropped++;
2036 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2037 struct vxlan_dev *vxlan,
2038 union vxlan_addr *daddr,
2039 __be16 dst_port, int dst_ifindex, __be32 vni,
2040 struct dst_entry *dst,
2043 #if IS_ENABLED(CONFIG_IPV6)
2044 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2045 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2046 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2048 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2050 /* Bypass encapsulation if the destination is local */
2051 if (rt_flags & RTCF_LOCAL &&
2052 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2053 struct vxlan_dev *dst_vxlan;
2056 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2057 daddr->sa.sa_family, dst_port,
2060 dev->stats.tx_errors++;
2065 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2072 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2073 __be32 default_vni, struct vxlan_rdst *rdst,
2076 struct dst_cache *dst_cache;
2077 struct ip_tunnel_info *info;
2078 struct vxlan_dev *vxlan = netdev_priv(dev);
2079 const struct iphdr *old_iph = ip_hdr(skb);
2080 union vxlan_addr *dst;
2081 union vxlan_addr remote_ip, local_ip;
2082 struct vxlan_metadata _md;
2083 struct vxlan_metadata *md = &_md;
2084 __be16 src_port = 0, dst_port;
2085 struct dst_entry *ndst = NULL;
2090 u32 flags = vxlan->cfg.flags;
2091 bool udp_sum = false;
2092 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2094 info = skb_tunnel_info(skb);
2097 dst = &rdst->remote_ip;
2098 if (vxlan_addr_any(dst)) {
2100 /* short-circuited back to local bridge */
2101 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2107 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2108 vni = (rdst->remote_vni) ? : default_vni;
2109 ifindex = rdst->remote_ifindex;
2110 local_ip = vxlan->cfg.saddr;
2111 dst_cache = &rdst->dst_cache;
2112 md->gbp = skb->mark;
2113 ttl = vxlan->cfg.ttl;
2114 if (!ttl && vxlan_addr_multicast(dst))
2117 tos = vxlan->cfg.tos;
2119 tos = ip_tunnel_get_dsfield(old_iph, skb);
2121 if (dst->sa.sa_family == AF_INET)
2122 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2124 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2125 label = vxlan->cfg.label;
2128 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2132 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2133 if (remote_ip.sa.sa_family == AF_INET) {
2134 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2135 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2137 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2138 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2141 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2142 vni = tunnel_id_to_key32(info->key.tun_id);
2144 dst_cache = &info->dst_cache;
2145 if (info->options_len)
2146 md = ip_tunnel_info_opts(info);
2147 ttl = info->key.ttl;
2148 tos = info->key.tos;
2149 label = info->key.label;
2150 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2152 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2153 vxlan->cfg.port_max, true);
2156 if (dst->sa.sa_family == AF_INET) {
2157 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2161 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2162 dst->sin.sin_addr.s_addr,
2163 &local_ip.sin.sin_addr.s_addr,
2171 /* Bypass encapsulation if the destination is local */
2173 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2174 dst_port, ifindex, vni,
2175 &rt->dst, rt->rt_flags);
2178 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2183 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2184 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2185 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2186 vni, md, flags, udp_sum);
2190 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2191 dst->sin.sin_addr.s_addr, tos, ttl, df,
2192 src_port, dst_port, xnet, !udp_sum);
2193 #if IS_ENABLED(CONFIG_IPV6)
2195 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2197 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2198 label, &dst->sin6.sin6_addr,
2199 &local_ip.sin6.sin6_addr,
2203 err = PTR_ERR(ndst);
2209 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2211 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2212 dst_port, ifindex, vni,
2218 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2219 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2220 skb_scrub_packet(skb, xnet);
2221 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2222 vni, md, flags, udp_sum);
2226 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2227 &local_ip.sin6.sin6_addr,
2228 &dst->sin6.sin6_addr, tos, ttl,
2229 label, src_port, dst_port, !udp_sum);
2237 dev->stats.tx_dropped++;
2244 dev->stats.collisions++;
2245 else if (err == -ENETUNREACH)
2246 dev->stats.tx_carrier_errors++;
2248 dev->stats.tx_errors++;
2252 /* Transmit local packets over Vxlan
2254 * Outer IP header inherits ECN and DF from inner header.
2255 * Outer UDP destination is the VXLAN assigned port.
2256 * source port is based on hash of flow
2258 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2260 struct vxlan_dev *vxlan = netdev_priv(dev);
2261 const struct ip_tunnel_info *info;
2263 bool did_rsc = false;
2264 struct vxlan_rdst *rdst, *fdst = NULL;
2265 struct vxlan_fdb *f;
2268 info = skb_tunnel_info(skb);
2270 skb_reset_mac_header(skb);
2272 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2273 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2274 info->mode & IP_TUNNEL_INFO_TX) {
2275 vni = tunnel_id_to_key32(info->key.tun_id);
2277 if (info && info->mode & IP_TUNNEL_INFO_TX)
2278 vxlan_xmit_one(skb, dev, vni, NULL, false);
2281 return NETDEV_TX_OK;
2285 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2287 if (ntohs(eth->h_proto) == ETH_P_ARP)
2288 return arp_reduce(dev, skb, vni);
2289 #if IS_ENABLED(CONFIG_IPV6)
2290 else if (ntohs(eth->h_proto) == ETH_P_IPV6) {
2291 struct ipv6hdr *hdr, _hdr;
2292 if ((hdr = skb_header_pointer(skb,
2293 skb_network_offset(skb),
2294 sizeof(_hdr), &_hdr)) &&
2295 hdr->nexthdr == IPPROTO_ICMPV6)
2296 return neigh_reduce(dev, skb, vni);
2302 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2305 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2306 (ntohs(eth->h_proto) == ETH_P_IP ||
2307 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2308 did_rsc = route_shortcircuit(dev, skb);
2310 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2314 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2316 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2317 !is_multicast_ether_addr(eth->h_dest))
2318 vxlan_fdb_miss(vxlan, eth->h_dest);
2320 dev->stats.tx_dropped++;
2322 return NETDEV_TX_OK;
2326 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2327 struct sk_buff *skb1;
2333 skb1 = skb_clone(skb, GFP_ATOMIC);
2335 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2339 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2342 return NETDEV_TX_OK;
2345 /* Walk the forwarding table and purge stale entries */
2346 static void vxlan_cleanup(unsigned long arg)
2348 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2349 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2352 if (!netif_running(vxlan->dev))
2355 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2356 struct hlist_node *p, *n;
2358 spin_lock_bh(&vxlan->hash_lock);
2359 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2361 = container_of(p, struct vxlan_fdb, hlist);
2362 unsigned long timeout;
2364 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2367 if (f->flags & NTF_EXT_LEARNED)
2370 timeout = f->used + vxlan->cfg.age_interval * HZ;
2371 if (time_before_eq(timeout, jiffies)) {
2372 netdev_dbg(vxlan->dev,
2373 "garbage collect %pM\n",
2375 f->state = NUD_STALE;
2376 vxlan_fdb_destroy(vxlan, f);
2377 } else if (time_before(timeout, next_timer))
2378 next_timer = timeout;
2380 spin_unlock_bh(&vxlan->hash_lock);
2383 mod_timer(&vxlan->age_timer, next_timer);
2386 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2388 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2390 spin_lock(&vn->sock_lock);
2391 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2392 #if IS_ENABLED(CONFIG_IPV6)
2393 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2395 spin_unlock(&vn->sock_lock);
2398 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2399 struct vxlan_dev_node *node)
2401 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2402 __be32 vni = vxlan->default_dst.remote_vni;
2404 node->vxlan = vxlan;
2405 spin_lock(&vn->sock_lock);
2406 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2407 spin_unlock(&vn->sock_lock);
2410 /* Setup stats when device is created */
2411 static int vxlan_init(struct net_device *dev)
2413 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2420 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2422 struct vxlan_fdb *f;
2424 spin_lock_bh(&vxlan->hash_lock);
2425 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2427 vxlan_fdb_destroy(vxlan, f);
2428 spin_unlock_bh(&vxlan->hash_lock);
2431 static void vxlan_uninit(struct net_device *dev)
2433 struct vxlan_dev *vxlan = netdev_priv(dev);
2435 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2437 free_percpu(dev->tstats);
2440 /* Start ageing timer and join group when device is brought up */
2441 static int vxlan_open(struct net_device *dev)
2443 struct vxlan_dev *vxlan = netdev_priv(dev);
2446 ret = vxlan_sock_add(vxlan);
2450 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2451 ret = vxlan_igmp_join(vxlan);
2452 if (ret == -EADDRINUSE)
2455 vxlan_sock_release(vxlan);
2460 if (vxlan->cfg.age_interval)
2461 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2466 /* Purge the forwarding table */
2467 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2471 spin_lock_bh(&vxlan->hash_lock);
2472 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2473 struct hlist_node *p, *n;
2474 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2476 = container_of(p, struct vxlan_fdb, hlist);
2477 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2479 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2480 if (!is_zero_ether_addr(f->eth_addr))
2481 vxlan_fdb_destroy(vxlan, f);
2484 spin_unlock_bh(&vxlan->hash_lock);
2487 /* Cleanup timer and forwarding table on shutdown */
2488 static int vxlan_stop(struct net_device *dev)
2490 struct vxlan_dev *vxlan = netdev_priv(dev);
2491 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2494 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2495 !vxlan_group_used(vn, vxlan))
2496 ret = vxlan_igmp_leave(vxlan);
2498 del_timer_sync(&vxlan->age_timer);
2500 vxlan_flush(vxlan, false);
2501 vxlan_sock_release(vxlan);
2506 /* Stub, nothing needs to be done. */
2507 static void vxlan_set_multicast_list(struct net_device *dev)
2511 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2513 struct vxlan_dev *vxlan = netdev_priv(dev);
2514 struct vxlan_rdst *dst = &vxlan->default_dst;
2515 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2516 dst->remote_ifindex);
2517 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2519 /* This check is different than dev->max_mtu, because it looks at
2520 * the lowerdev->mtu, rather than the static dev->max_mtu
2523 int max_mtu = lowerdev->mtu -
2524 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2525 if (new_mtu > max_mtu)
2533 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2535 struct vxlan_dev *vxlan = netdev_priv(dev);
2536 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2537 __be16 sport, dport;
2539 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2540 vxlan->cfg.port_max, true);
2541 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2543 if (ip_tunnel_info_af(info) == AF_INET) {
2544 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2547 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2548 info->key.u.ipv4.dst,
2549 &info->key.u.ipv4.src, dport, sport,
2550 &info->dst_cache, info);
2555 #if IS_ENABLED(CONFIG_IPV6)
2556 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2557 struct dst_entry *ndst;
2559 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2560 info->key.label, &info->key.u.ipv6.dst,
2561 &info->key.u.ipv6.src, dport, sport,
2562 &info->dst_cache, info);
2564 return PTR_ERR(ndst);
2566 #else /* !CONFIG_IPV6 */
2567 return -EPFNOSUPPORT;
2570 info->key.tp_src = sport;
2571 info->key.tp_dst = dport;
2575 static const struct net_device_ops vxlan_netdev_ether_ops = {
2576 .ndo_init = vxlan_init,
2577 .ndo_uninit = vxlan_uninit,
2578 .ndo_open = vxlan_open,
2579 .ndo_stop = vxlan_stop,
2580 .ndo_start_xmit = vxlan_xmit,
2581 .ndo_get_stats64 = ip_tunnel_get_stats64,
2582 .ndo_set_rx_mode = vxlan_set_multicast_list,
2583 .ndo_change_mtu = vxlan_change_mtu,
2584 .ndo_validate_addr = eth_validate_addr,
2585 .ndo_set_mac_address = eth_mac_addr,
2586 .ndo_fdb_add = vxlan_fdb_add,
2587 .ndo_fdb_del = vxlan_fdb_delete,
2588 .ndo_fdb_dump = vxlan_fdb_dump,
2589 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2592 static const struct net_device_ops vxlan_netdev_raw_ops = {
2593 .ndo_init = vxlan_init,
2594 .ndo_uninit = vxlan_uninit,
2595 .ndo_open = vxlan_open,
2596 .ndo_stop = vxlan_stop,
2597 .ndo_start_xmit = vxlan_xmit,
2598 .ndo_get_stats64 = ip_tunnel_get_stats64,
2599 .ndo_change_mtu = vxlan_change_mtu,
2600 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2603 /* Info for udev, that this is a virtual tunnel endpoint */
2604 static struct device_type vxlan_type = {
2608 /* Calls the ndo_udp_tunnel_add of the caller in order to
2609 * supply the listening VXLAN udp ports. Callers are expected
2610 * to implement the ndo_udp_tunnel_add.
2612 static void vxlan_push_rx_ports(struct net_device *dev)
2614 struct vxlan_sock *vs;
2615 struct net *net = dev_net(dev);
2616 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2619 spin_lock(&vn->sock_lock);
2620 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2621 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist)
2622 udp_tunnel_push_rx_port(dev, vs->sock,
2623 (vs->flags & VXLAN_F_GPE) ?
2624 UDP_TUNNEL_TYPE_VXLAN_GPE :
2625 UDP_TUNNEL_TYPE_VXLAN);
2627 spin_unlock(&vn->sock_lock);
2630 /* Initialize the device structure. */
2631 static void vxlan_setup(struct net_device *dev)
2633 struct vxlan_dev *vxlan = netdev_priv(dev);
2636 eth_hw_addr_random(dev);
2639 dev->needs_free_netdev = true;
2640 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2642 dev->features |= NETIF_F_LLTX;
2643 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2644 dev->features |= NETIF_F_RXCSUM;
2645 dev->features |= NETIF_F_GSO_SOFTWARE;
2647 dev->vlan_features = dev->features;
2648 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2649 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2650 netif_keep_dst(dev);
2651 dev->priv_flags |= IFF_NO_QUEUE;
2653 /* MTU range: 68 - 65535 */
2654 dev->min_mtu = ETH_MIN_MTU;
2655 dev->max_mtu = ETH_MAX_MTU;
2657 INIT_LIST_HEAD(&vxlan->next);
2658 spin_lock_init(&vxlan->hash_lock);
2660 init_timer_deferrable(&vxlan->age_timer);
2661 vxlan->age_timer.function = vxlan_cleanup;
2662 vxlan->age_timer.data = (unsigned long) vxlan;
2666 gro_cells_init(&vxlan->gro_cells, dev);
2668 for (h = 0; h < FDB_HASH_SIZE; ++h)
2669 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2672 static void vxlan_ether_setup(struct net_device *dev)
2674 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2675 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2676 dev->netdev_ops = &vxlan_netdev_ether_ops;
2679 static void vxlan_raw_setup(struct net_device *dev)
2681 dev->header_ops = NULL;
2682 dev->type = ARPHRD_NONE;
2683 dev->hard_header_len = 0;
2685 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2686 dev->netdev_ops = &vxlan_netdev_raw_ops;
2689 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2690 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2691 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2692 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2693 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2694 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2695 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2696 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2697 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2698 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2699 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2700 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2701 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2702 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2703 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2704 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2705 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2706 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2707 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2708 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2709 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2710 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2711 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2712 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2713 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2714 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2715 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2716 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2719 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
2720 struct netlink_ext_ack *extack)
2722 if (tb[IFLA_ADDRESS]) {
2723 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2724 pr_debug("invalid link address (not ethernet)\n");
2728 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2729 pr_debug("invalid all zero ethernet address\n");
2730 return -EADDRNOTAVAIL;
2735 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
2737 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU)
2744 if (data[IFLA_VXLAN_ID]) {
2745 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2747 if (id >= VXLAN_N_VID)
2751 if (data[IFLA_VXLAN_PORT_RANGE]) {
2752 const struct ifla_vxlan_port_range *p
2753 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2755 if (ntohs(p->high) < ntohs(p->low)) {
2756 pr_debug("port range %u .. %u not valid\n",
2757 ntohs(p->low), ntohs(p->high));
2765 static void vxlan_get_drvinfo(struct net_device *netdev,
2766 struct ethtool_drvinfo *drvinfo)
2768 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2769 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2772 static const struct ethtool_ops vxlan_ethtool_ops = {
2773 .get_drvinfo = vxlan_get_drvinfo,
2774 .get_link = ethtool_op_get_link,
2777 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2778 __be16 port, u32 flags)
2780 struct socket *sock;
2781 struct udp_port_cfg udp_conf;
2784 memset(&udp_conf, 0, sizeof(udp_conf));
2787 udp_conf.family = AF_INET6;
2788 udp_conf.use_udp6_rx_checksums =
2789 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2790 udp_conf.ipv6_v6only = 1;
2792 udp_conf.family = AF_INET;
2795 udp_conf.local_udp_port = port;
2797 /* Open UDP socket */
2798 err = udp_sock_create(net, &udp_conf, &sock);
2800 return ERR_PTR(err);
2805 /* Create new listen socket if needed */
2806 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2807 __be16 port, u32 flags)
2809 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2810 struct vxlan_sock *vs;
2811 struct socket *sock;
2813 struct udp_tunnel_sock_cfg tunnel_cfg;
2815 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2817 return ERR_PTR(-ENOMEM);
2819 for (h = 0; h < VNI_HASH_SIZE; ++h)
2820 INIT_HLIST_HEAD(&vs->vni_list[h]);
2822 sock = vxlan_create_sock(net, ipv6, port, flags);
2825 return ERR_CAST(sock);
2829 refcount_set(&vs->refcnt, 1);
2830 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2832 spin_lock(&vn->sock_lock);
2833 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2834 udp_tunnel_notify_add_rx_port(sock,
2835 (vs->flags & VXLAN_F_GPE) ?
2836 UDP_TUNNEL_TYPE_VXLAN_GPE :
2837 UDP_TUNNEL_TYPE_VXLAN);
2838 spin_unlock(&vn->sock_lock);
2840 /* Mark socket as an encapsulation socket. */
2841 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2842 tunnel_cfg.sk_user_data = vs;
2843 tunnel_cfg.encap_type = 1;
2844 tunnel_cfg.encap_rcv = vxlan_rcv;
2845 tunnel_cfg.encap_destroy = NULL;
2846 tunnel_cfg.gro_receive = vxlan_gro_receive;
2847 tunnel_cfg.gro_complete = vxlan_gro_complete;
2849 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2854 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2856 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2857 struct vxlan_sock *vs = NULL;
2858 struct vxlan_dev_node *node;
2860 if (!vxlan->cfg.no_share) {
2861 spin_lock(&vn->sock_lock);
2862 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2863 vxlan->cfg.dst_port, vxlan->cfg.flags);
2864 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
2865 spin_unlock(&vn->sock_lock);
2868 spin_unlock(&vn->sock_lock);
2871 vs = vxlan_socket_create(vxlan->net, ipv6,
2872 vxlan->cfg.dst_port, vxlan->cfg.flags);
2875 #if IS_ENABLED(CONFIG_IPV6)
2877 rcu_assign_pointer(vxlan->vn6_sock, vs);
2878 node = &vxlan->hlist6;
2882 rcu_assign_pointer(vxlan->vn4_sock, vs);
2883 node = &vxlan->hlist4;
2885 vxlan_vs_add_dev(vs, vxlan, node);
2889 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2891 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
2892 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
2893 bool ipv4 = !ipv6 || metadata;
2896 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2897 #if IS_ENABLED(CONFIG_IPV6)
2898 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2900 ret = __vxlan_sock_add(vxlan, true);
2901 if (ret < 0 && ret != -EAFNOSUPPORT)
2906 ret = __vxlan_sock_add(vxlan, false);
2908 vxlan_sock_release(vxlan);
2912 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
2913 struct net_device **lower,
2914 struct vxlan_dev *old)
2916 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2917 struct vxlan_dev *tmp;
2918 bool use_ipv6 = false;
2920 if (conf->flags & VXLAN_F_GPE) {
2921 /* For now, allow GPE only together with
2922 * COLLECT_METADATA. This can be relaxed later; in such
2923 * case, the other side of the PtP link will have to be
2926 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
2927 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2932 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
2933 /* Unless IPv6 is explicitly requested, assume IPv4 */
2934 conf->remote_ip.sa.sa_family = AF_INET;
2935 conf->saddr.sa.sa_family = AF_INET;
2936 } else if (!conf->remote_ip.sa.sa_family) {
2937 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
2938 } else if (!conf->saddr.sa.sa_family) {
2939 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
2942 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family)
2945 if (vxlan_addr_multicast(&conf->saddr))
2948 if (conf->saddr.sa.sa_family == AF_INET6) {
2949 if (!IS_ENABLED(CONFIG_IPV6))
2950 return -EPFNOSUPPORT;
2952 conf->flags |= VXLAN_F_IPV6;
2954 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2956 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
2958 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
2960 if (local_type & IPV6_ADDR_LINKLOCAL) {
2961 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
2962 (remote_type != IPV6_ADDR_ANY))
2965 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
2968 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL))
2971 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
2976 if (conf->label && !use_ipv6)
2979 if (conf->remote_ifindex) {
2980 struct net_device *lowerdev;
2982 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2986 #if IS_ENABLED(CONFIG_IPV6)
2988 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2989 if (idev && idev->cnf.disable_ipv6)
2996 if (vxlan_addr_multicast(&conf->remote_ip))
2999 #if IS_ENABLED(CONFIG_IPV6)
3000 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL)
3007 if (!conf->dst_port) {
3008 if (conf->flags & VXLAN_F_GPE)
3009 conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3011 conf->dst_port = htons(vxlan_port);
3014 if (!conf->age_interval)
3015 conf->age_interval = FDB_AGE_DEFAULT;
3017 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3021 if (tmp->cfg.vni != conf->vni)
3023 if (tmp->cfg.dst_port != conf->dst_port)
3025 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3026 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3029 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3030 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3039 static void vxlan_config_apply(struct net_device *dev,
3040 struct vxlan_config *conf,
3041 struct net_device *lowerdev,
3042 struct net *src_net,
3045 struct vxlan_dev *vxlan = netdev_priv(dev);
3046 struct vxlan_rdst *dst = &vxlan->default_dst;
3047 unsigned short needed_headroom = ETH_HLEN;
3048 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3049 int max_mtu = ETH_MAX_MTU;
3052 if (conf->flags & VXLAN_F_GPE)
3053 vxlan_raw_setup(dev);
3055 vxlan_ether_setup(dev);
3058 dev->mtu = conf->mtu;
3060 vxlan->net = src_net;
3063 dst->remote_vni = conf->vni;
3065 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3068 dst->remote_ifindex = conf->remote_ifindex;
3070 dev->gso_max_size = lowerdev->gso_max_size;
3071 dev->gso_max_segs = lowerdev->gso_max_segs;
3073 needed_headroom = lowerdev->hard_header_len;
3075 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3079 if (dev->mtu > max_mtu)
3082 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3083 needed_headroom += VXLAN6_HEADROOM;
3085 needed_headroom += VXLAN_HEADROOM;
3086 dev->needed_headroom = needed_headroom;
3088 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3091 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3092 struct vxlan_config *conf,
3095 struct vxlan_dev *vxlan = netdev_priv(dev);
3096 struct net_device *lowerdev;
3099 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan);
3103 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3108 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3109 struct vxlan_config *conf)
3111 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3112 struct vxlan_dev *vxlan = netdev_priv(dev);
3115 err = vxlan_dev_configure(net, dev, conf, false);
3119 dev->ethtool_ops = &vxlan_ethtool_ops;
3121 /* create an fdb entry for a valid default destination */
3122 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3123 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3124 &vxlan->default_dst.remote_ip,
3125 NUD_REACHABLE | NUD_PERMANENT,
3126 NLM_F_EXCL | NLM_F_CREATE,
3127 vxlan->cfg.dst_port,
3128 vxlan->default_dst.remote_vni,
3129 vxlan->default_dst.remote_vni,
3130 vxlan->default_dst.remote_ifindex,
3136 err = register_netdevice(dev);
3138 vxlan_fdb_delete_default(vxlan, vxlan->default_dst.remote_vni);
3142 list_add(&vxlan->next, &vn->vxlan_list);
3146 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3147 struct net_device *dev, struct vxlan_config *conf,
3150 struct vxlan_dev *vxlan = netdev_priv(dev);
3152 memset(conf, 0, sizeof(*conf));
3154 /* if changelink operation, start with old existing cfg */
3156 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3158 if (data[IFLA_VXLAN_ID]) {
3159 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3161 if (changelink && (vni != conf->vni))
3163 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3166 if (data[IFLA_VXLAN_GROUP]) {
3167 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
3170 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3171 conf->remote_ip.sa.sa_family = AF_INET;
3172 } else if (data[IFLA_VXLAN_GROUP6]) {
3173 if (!IS_ENABLED(CONFIG_IPV6))
3174 return -EPFNOSUPPORT;
3176 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
3179 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3180 conf->remote_ip.sa.sa_family = AF_INET6;
3183 if (data[IFLA_VXLAN_LOCAL]) {
3184 if (changelink && (conf->saddr.sa.sa_family != AF_INET))
3187 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3188 conf->saddr.sa.sa_family = AF_INET;
3189 } else if (data[IFLA_VXLAN_LOCAL6]) {
3190 if (!IS_ENABLED(CONFIG_IPV6))
3191 return -EPFNOSUPPORT;
3193 if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
3196 /* TODO: respect scope id */
3197 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3198 conf->saddr.sa.sa_family = AF_INET6;
3201 if (data[IFLA_VXLAN_LINK])
3202 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3204 if (data[IFLA_VXLAN_TOS])
3205 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3207 if (data[IFLA_VXLAN_TTL])
3208 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3210 if (data[IFLA_VXLAN_LABEL])
3211 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3212 IPV6_FLOWLABEL_MASK;
3214 if (data[IFLA_VXLAN_LEARNING]) {
3215 if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3216 conf->flags |= VXLAN_F_LEARN;
3218 conf->flags &= ~VXLAN_F_LEARN;
3219 } else if (!changelink) {
3220 /* default to learn on a new device */
3221 conf->flags |= VXLAN_F_LEARN;
3224 if (data[IFLA_VXLAN_AGEING]) {
3227 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3230 if (data[IFLA_VXLAN_PROXY]) {
3233 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3234 conf->flags |= VXLAN_F_PROXY;
3237 if (data[IFLA_VXLAN_RSC]) {
3240 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3241 conf->flags |= VXLAN_F_RSC;
3244 if (data[IFLA_VXLAN_L2MISS]) {
3247 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3248 conf->flags |= VXLAN_F_L2MISS;
3251 if (data[IFLA_VXLAN_L3MISS]) {
3254 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3255 conf->flags |= VXLAN_F_L3MISS;
3258 if (data[IFLA_VXLAN_LIMIT]) {
3261 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3264 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3267 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3268 conf->flags |= VXLAN_F_COLLECT_METADATA;
3271 if (data[IFLA_VXLAN_PORT_RANGE]) {
3273 const struct ifla_vxlan_port_range *p
3274 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3275 conf->port_min = ntohs(p->low);
3276 conf->port_max = ntohs(p->high);
3282 if (data[IFLA_VXLAN_PORT]) {
3285 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3288 if (data[IFLA_VXLAN_UDP_CSUM]) {
3291 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3292 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3295 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3298 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3299 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3302 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3305 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3306 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3309 if (data[IFLA_VXLAN_REMCSUM_TX]) {
3312 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3313 conf->flags |= VXLAN_F_REMCSUM_TX;
3316 if (data[IFLA_VXLAN_REMCSUM_RX]) {
3319 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3320 conf->flags |= VXLAN_F_REMCSUM_RX;
3323 if (data[IFLA_VXLAN_GBP]) {
3326 conf->flags |= VXLAN_F_GBP;
3329 if (data[IFLA_VXLAN_GPE]) {
3332 conf->flags |= VXLAN_F_GPE;
3335 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3338 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3344 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3350 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3351 struct nlattr *tb[], struct nlattr *data[],
3352 struct netlink_ext_ack *extack)
3354 struct vxlan_config conf;
3357 err = vxlan_nl2conf(tb, data, dev, &conf, false);
3361 return __vxlan_dev_create(src_net, dev, &conf);
3364 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3365 struct nlattr *data[],
3366 struct netlink_ext_ack *extack)
3368 struct vxlan_dev *vxlan = netdev_priv(dev);
3369 struct vxlan_rdst *dst = &vxlan->default_dst;
3370 struct vxlan_rdst old_dst;
3371 struct vxlan_config conf;
3374 err = vxlan_nl2conf(tb, data,
3379 memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3381 err = vxlan_dev_configure(vxlan->net, dev, &conf, true);
3385 /* handle default dst entry */
3386 if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3387 spin_lock_bh(&vxlan->hash_lock);
3388 if (!vxlan_addr_any(&old_dst.remote_ip))
3389 __vxlan_fdb_delete(vxlan, all_zeros_mac,
3391 vxlan->cfg.dst_port,
3394 old_dst.remote_ifindex, 0);
3396 if (!vxlan_addr_any(&dst->remote_ip)) {
3397 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3399 NUD_REACHABLE | NUD_PERMANENT,
3400 NLM_F_CREATE | NLM_F_APPEND,
3401 vxlan->cfg.dst_port,
3404 dst->remote_ifindex,
3407 spin_unlock_bh(&vxlan->hash_lock);
3411 spin_unlock_bh(&vxlan->hash_lock);
3417 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3419 struct vxlan_dev *vxlan = netdev_priv(dev);
3421 vxlan_flush(vxlan, true);
3423 gro_cells_destroy(&vxlan->gro_cells);
3424 list_del(&vxlan->next);
3425 unregister_netdevice_queue(dev, head);
3428 static size_t vxlan_get_size(const struct net_device *dev)
3431 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3432 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3433 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3434 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3435 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3436 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3437 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3438 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3439 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3440 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3441 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3442 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3443 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3444 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3445 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3446 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3447 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3448 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3449 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3450 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3451 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3452 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3456 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3458 const struct vxlan_dev *vxlan = netdev_priv(dev);
3459 const struct vxlan_rdst *dst = &vxlan->default_dst;
3460 struct ifla_vxlan_port_range ports = {
3461 .low = htons(vxlan->cfg.port_min),
3462 .high = htons(vxlan->cfg.port_max),
3465 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3466 goto nla_put_failure;
3468 if (!vxlan_addr_any(&dst->remote_ip)) {
3469 if (dst->remote_ip.sa.sa_family == AF_INET) {
3470 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3471 dst->remote_ip.sin.sin_addr.s_addr))
3472 goto nla_put_failure;
3473 #if IS_ENABLED(CONFIG_IPV6)
3475 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3476 &dst->remote_ip.sin6.sin6_addr))
3477 goto nla_put_failure;
3482 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3483 goto nla_put_failure;
3485 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3486 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3487 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3488 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3489 goto nla_put_failure;
3490 #if IS_ENABLED(CONFIG_IPV6)
3492 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3493 &vxlan->cfg.saddr.sin6.sin6_addr))
3494 goto nla_put_failure;
3499 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3500 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3501 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3502 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3503 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
3504 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3505 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
3506 nla_put_u8(skb, IFLA_VXLAN_RSC,
3507 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
3508 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3509 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
3510 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3511 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
3512 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3513 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
3514 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3515 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3516 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3517 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3518 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3519 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3520 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3521 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3522 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3523 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3524 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
3525 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3526 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
3527 goto nla_put_failure;
3529 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3530 goto nla_put_failure;
3532 if (vxlan->cfg.flags & VXLAN_F_GBP &&
3533 nla_put_flag(skb, IFLA_VXLAN_GBP))
3534 goto nla_put_failure;
3536 if (vxlan->cfg.flags & VXLAN_F_GPE &&
3537 nla_put_flag(skb, IFLA_VXLAN_GPE))
3538 goto nla_put_failure;
3540 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3541 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3542 goto nla_put_failure;
3550 static struct net *vxlan_get_link_net(const struct net_device *dev)
3552 struct vxlan_dev *vxlan = netdev_priv(dev);
3557 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3559 .maxtype = IFLA_VXLAN_MAX,
3560 .policy = vxlan_policy,
3561 .priv_size = sizeof(struct vxlan_dev),
3562 .setup = vxlan_setup,
3563 .validate = vxlan_validate,
3564 .newlink = vxlan_newlink,
3565 .changelink = vxlan_changelink,
3566 .dellink = vxlan_dellink,
3567 .get_size = vxlan_get_size,
3568 .fill_info = vxlan_fill_info,
3569 .get_link_net = vxlan_get_link_net,
3572 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3573 u8 name_assign_type,
3574 struct vxlan_config *conf)
3576 struct nlattr *tb[IFLA_MAX + 1];
3577 struct net_device *dev;
3580 memset(&tb, 0, sizeof(tb));
3582 dev = rtnl_create_link(net, name, name_assign_type,
3583 &vxlan_link_ops, tb);
3587 err = __vxlan_dev_create(net, dev, conf);
3590 return ERR_PTR(err);
3593 err = rtnl_configure_link(dev, NULL);
3595 LIST_HEAD(list_kill);
3597 vxlan_dellink(dev, &list_kill);
3598 unregister_netdevice_many(&list_kill);
3599 return ERR_PTR(err);
3604 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3606 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3607 struct net_device *dev)
3609 struct vxlan_dev *vxlan, *next;
3610 LIST_HEAD(list_kill);
3612 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3613 struct vxlan_rdst *dst = &vxlan->default_dst;
3615 /* In case we created vxlan device with carrier
3616 * and we loose the carrier due to module unload
3617 * we also need to remove vxlan device. In other
3618 * cases, it's not necessary and remote_ifindex
3619 * is 0 here, so no matches.
3621 if (dst->remote_ifindex == dev->ifindex)
3622 vxlan_dellink(vxlan->dev, &list_kill);
3625 unregister_netdevice_many(&list_kill);
3628 static int vxlan_netdevice_event(struct notifier_block *unused,
3629 unsigned long event, void *ptr)
3631 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3632 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3634 if (event == NETDEV_UNREGISTER)
3635 vxlan_handle_lowerdev_unregister(vn, dev);
3636 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
3637 vxlan_push_rx_ports(dev);
3642 static struct notifier_block vxlan_notifier_block __read_mostly = {
3643 .notifier_call = vxlan_netdevice_event,
3646 static __net_init int vxlan_init_net(struct net *net)
3648 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3651 INIT_LIST_HEAD(&vn->vxlan_list);
3652 spin_lock_init(&vn->sock_lock);
3654 for (h = 0; h < PORT_HASH_SIZE; ++h)
3655 INIT_HLIST_HEAD(&vn->sock_list[h]);
3660 static void __net_exit vxlan_exit_net(struct net *net)
3662 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3663 struct vxlan_dev *vxlan, *next;
3664 struct net_device *dev, *aux;
3668 for_each_netdev_safe(net, dev, aux)
3669 if (dev->rtnl_link_ops == &vxlan_link_ops)
3670 unregister_netdevice_queue(dev, &list);
3672 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3673 /* If vxlan->dev is in the same netns, it has already been added
3674 * to the list by the previous loop.
3676 if (!net_eq(dev_net(vxlan->dev), net)) {
3677 gro_cells_destroy(&vxlan->gro_cells);
3678 unregister_netdevice_queue(vxlan->dev, &list);
3682 unregister_netdevice_many(&list);
3686 static struct pernet_operations vxlan_net_ops = {
3687 .init = vxlan_init_net,
3688 .exit = vxlan_exit_net,
3689 .id = &vxlan_net_id,
3690 .size = sizeof(struct vxlan_net),
3693 static int __init vxlan_init_module(void)
3697 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3699 rc = register_pernet_subsys(&vxlan_net_ops);
3703 rc = register_netdevice_notifier(&vxlan_notifier_block);
3707 rc = rtnl_link_register(&vxlan_link_ops);
3713 unregister_netdevice_notifier(&vxlan_notifier_block);
3715 unregister_pernet_subsys(&vxlan_net_ops);
3719 late_initcall(vxlan_init_module);
3721 static void __exit vxlan_cleanup_module(void)
3723 rtnl_link_unregister(&vxlan_link_ops);
3724 unregister_netdevice_notifier(&vxlan_notifier_block);
3725 unregister_pernet_subsys(&vxlan_net_ops);
3726 /* rcu_barrier() is called by netns */
3728 module_exit(vxlan_cleanup_module);
3730 MODULE_LICENSE("GPL");
3731 MODULE_VERSION(VXLAN_VERSION);
3732 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3733 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3734 MODULE_ALIAS_RTNL_LINK("vxlan");