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/tun_proto.h>
30 #include <net/vxlan.h>
32 #if IS_ENABLED(CONFIG_IPV6)
33 #include <net/ip6_tunnel.h>
34 #include <net/ip6_checksum.h>
37 #define VXLAN_VERSION "0.1"
39 #define PORT_HASH_BITS 8
40 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
41 #define FDB_AGE_DEFAULT 300 /* 5 min */
42 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
44 /* UDP port for VXLAN traffic.
45 * The IANA assigned port is 4789, but the Linux default is 8472
46 * for compatibility with early adopters.
48 static unsigned short vxlan_port __read_mostly = 8472;
49 module_param_named(udp_port, vxlan_port, ushort, 0444);
50 MODULE_PARM_DESC(udp_port, "Destination UDP port");
52 static bool log_ecn_error = true;
53 module_param(log_ecn_error, bool, 0644);
54 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
56 static unsigned int vxlan_net_id;
57 static struct rtnl_link_ops vxlan_link_ops;
59 static const u8 all_zeros_mac[ETH_ALEN + 2];
61 static int vxlan_sock_add(struct vxlan_dev *vxlan);
63 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
65 /* per-network namespace private data for this module */
67 struct list_head vxlan_list;
68 struct hlist_head sock_list[PORT_HASH_SIZE];
72 /* Forwarding table entry */
74 struct hlist_node hlist; /* linked list of entries */
76 unsigned long updated; /* jiffies */
78 struct list_head remotes;
79 u8 eth_addr[ETH_ALEN];
80 u16 state; /* see ndm_state */
82 u8 flags; /* see ndm_flags */
85 /* salt for hash table */
86 static u32 vxlan_salt __read_mostly;
88 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
90 return vs->flags & VXLAN_F_COLLECT_METADATA ||
91 ip_tunnel_collect_metadata();
94 #if IS_ENABLED(CONFIG_IPV6)
96 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
98 if (a->sa.sa_family != b->sa.sa_family)
100 if (a->sa.sa_family == AF_INET6)
101 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
103 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
106 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
108 if (ipa->sa.sa_family == AF_INET6)
109 return ipv6_addr_any(&ipa->sin6.sin6_addr);
111 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
114 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
116 if (ipa->sa.sa_family == AF_INET6)
117 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
119 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
122 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
124 if (nla_len(nla) >= sizeof(struct in6_addr)) {
125 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
126 ip->sa.sa_family = AF_INET6;
128 } else if (nla_len(nla) >= sizeof(__be32)) {
129 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
130 ip->sa.sa_family = AF_INET;
133 return -EAFNOSUPPORT;
137 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
138 const union vxlan_addr *ip)
140 if (ip->sa.sa_family == AF_INET6)
141 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
143 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
146 #else /* !CONFIG_IPV6 */
149 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
151 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
154 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
156 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
159 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
161 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
164 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
166 if (nla_len(nla) >= sizeof(struct in6_addr)) {
167 return -EAFNOSUPPORT;
168 } else if (nla_len(nla) >= sizeof(__be32)) {
169 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
170 ip->sa.sa_family = AF_INET;
173 return -EAFNOSUPPORT;
177 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
178 const union vxlan_addr *ip)
180 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
184 /* Virtual Network hash table head */
185 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
187 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
190 /* Socket hash table head */
191 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
193 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
195 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
198 /* First remote destination for a forwarding entry.
199 * Guaranteed to be non-NULL because remotes are never deleted.
201 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
203 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
206 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
208 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
211 /* Find VXLAN socket based on network namespace, address family and UDP port
212 * and enabled unshareable flags.
214 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
215 __be16 port, u32 flags)
217 struct vxlan_sock *vs;
219 flags &= VXLAN_F_RCV_FLAGS;
221 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
222 if (inet_sk(vs->sock->sk)->inet_sport == port &&
223 vxlan_get_sk_family(vs) == family &&
230 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
233 struct vxlan_dev_node *node;
235 /* For flow based devices, map all packets to VNI 0 */
236 if (vs->flags & VXLAN_F_COLLECT_METADATA)
239 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
240 if (node->vxlan->default_dst.remote_vni != vni)
243 if (IS_ENABLED(CONFIG_IPV6)) {
244 const struct vxlan_config *cfg = &node->vxlan->cfg;
246 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
247 cfg->remote_ifindex != ifindex)
257 /* Look up VNI in a per net namespace table */
258 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
259 __be32 vni, sa_family_t family,
260 __be16 port, u32 flags)
262 struct vxlan_sock *vs;
264 vs = vxlan_find_sock(net, family, port, flags);
268 return vxlan_vs_find_vni(vs, ifindex, vni);
271 /* Fill in neighbour message in skbuff. */
272 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
273 const struct vxlan_fdb *fdb,
274 u32 portid, u32 seq, int type, unsigned int flags,
275 const struct vxlan_rdst *rdst)
277 unsigned long now = jiffies;
278 struct nda_cacheinfo ci;
279 struct nlmsghdr *nlh;
281 bool send_ip, send_eth;
283 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
287 ndm = nlmsg_data(nlh);
288 memset(ndm, 0, sizeof(*ndm));
290 send_eth = send_ip = true;
292 if (type == RTM_GETNEIGH) {
293 send_ip = !vxlan_addr_any(&rdst->remote_ip);
294 send_eth = !is_zero_ether_addr(fdb->eth_addr);
295 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
297 ndm->ndm_family = AF_BRIDGE;
298 ndm->ndm_state = fdb->state;
299 ndm->ndm_ifindex = vxlan->dev->ifindex;
300 ndm->ndm_flags = fdb->flags;
301 ndm->ndm_type = RTN_UNICAST;
303 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
304 nla_put_s32(skb, NDA_LINK_NETNSID,
305 peernet2id(dev_net(vxlan->dev), vxlan->net)))
306 goto nla_put_failure;
308 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
309 goto nla_put_failure;
311 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
312 goto nla_put_failure;
314 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
315 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
316 goto nla_put_failure;
317 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
318 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
319 goto nla_put_failure;
320 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
321 nla_put_u32(skb, NDA_SRC_VNI,
322 be32_to_cpu(fdb->vni)))
323 goto nla_put_failure;
324 if (rdst->remote_ifindex &&
325 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
326 goto nla_put_failure;
328 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
329 ci.ndm_confirmed = 0;
330 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
333 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
334 goto nla_put_failure;
340 nlmsg_cancel(skb, nlh);
344 static inline size_t vxlan_nlmsg_size(void)
346 return NLMSG_ALIGN(sizeof(struct ndmsg))
347 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
348 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
349 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
350 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
351 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
352 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
353 + nla_total_size(sizeof(struct nda_cacheinfo));
356 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
357 struct vxlan_rdst *rd, int type)
359 struct net *net = dev_net(vxlan->dev);
363 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
367 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
369 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
370 WARN_ON(err == -EMSGSIZE);
375 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
379 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
382 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
384 struct vxlan_dev *vxlan = netdev_priv(dev);
385 struct vxlan_fdb f = {
388 struct vxlan_rdst remote = {
389 .remote_ip = *ipa, /* goes to NDA_DST */
390 .remote_vni = cpu_to_be32(VXLAN_N_VID),
393 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
396 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
398 struct vxlan_fdb f = {
401 struct vxlan_rdst remote = { };
403 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
405 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
408 /* Hash Ethernet address */
409 static u32 eth_hash(const unsigned char *addr)
411 u64 value = get_unaligned((u64 *)addr);
413 /* only want 6 bytes */
419 return hash_64(value, FDB_HASH_BITS);
422 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
424 /* use 1 byte of OUI and 3 bytes of NIC */
425 u32 key = get_unaligned((u32 *)(addr + 2));
427 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
430 /* Hash chain to use given mac address */
431 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
432 const u8 *mac, __be32 vni)
434 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
435 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
437 return &vxlan->fdb_head[eth_hash(mac)];
440 /* Look up Ethernet address in forwarding table */
441 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
442 const u8 *mac, __be32 vni)
444 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
447 hlist_for_each_entry_rcu(f, head, hlist) {
448 if (ether_addr_equal(mac, f->eth_addr)) {
449 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
461 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
462 const u8 *mac, __be32 vni)
466 f = __vxlan_find_mac(vxlan, mac, vni);
473 /* caller should hold vxlan->hash_lock */
474 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
475 union vxlan_addr *ip, __be16 port,
476 __be32 vni, __u32 ifindex)
478 struct vxlan_rdst *rd;
480 list_for_each_entry(rd, &f->remotes, list) {
481 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
482 rd->remote_port == port &&
483 rd->remote_vni == vni &&
484 rd->remote_ifindex == ifindex)
491 /* Replace destination of unicast mac */
492 static int vxlan_fdb_replace(struct vxlan_fdb *f,
493 union vxlan_addr *ip, __be16 port, __be32 vni,
496 struct vxlan_rdst *rd;
498 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
502 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
506 dst_cache_reset(&rd->dst_cache);
508 rd->remote_port = port;
509 rd->remote_vni = vni;
510 rd->remote_ifindex = ifindex;
514 /* Add/update destinations for multicast */
515 static int vxlan_fdb_append(struct vxlan_fdb *f,
516 union vxlan_addr *ip, __be16 port, __be32 vni,
517 __u32 ifindex, struct vxlan_rdst **rdp)
519 struct vxlan_rdst *rd;
521 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
525 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
529 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
535 rd->remote_port = port;
536 rd->remote_vni = vni;
537 rd->remote_ifindex = ifindex;
539 list_add_tail_rcu(&rd->list, &f->remotes);
545 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
547 struct vxlanhdr *vh, size_t hdrlen,
549 struct gro_remcsum *grc,
552 size_t start, offset;
554 if (skb->remcsum_offload)
557 if (!NAPI_GRO_CB(skb)->csum_valid)
560 start = vxlan_rco_start(vni_field);
561 offset = start + vxlan_rco_offset(vni_field);
563 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
564 start, offset, grc, nopartial);
566 skb->remcsum_offload = 1;
571 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
572 struct sk_buff **head,
575 struct sk_buff *p, **pp = NULL;
576 struct vxlanhdr *vh, *vh2;
577 unsigned int hlen, off_vx;
579 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
581 struct gro_remcsum grc;
583 skb_gro_remcsum_init(&grc);
585 off_vx = skb_gro_offset(skb);
586 hlen = off_vx + sizeof(*vh);
587 vh = skb_gro_header_fast(skb, off_vx);
588 if (skb_gro_header_hard(skb, hlen)) {
589 vh = skb_gro_header_slow(skb, hlen, off_vx);
594 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
596 flags = vh->vx_flags;
598 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
599 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
602 VXLAN_F_REMCSUM_NOPARTIAL));
608 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
610 for (p = *head; p; p = p->next) {
611 if (!NAPI_GRO_CB(p)->same_flow)
614 vh2 = (struct vxlanhdr *)(p->data + off_vx);
615 if (vh->vx_flags != vh2->vx_flags ||
616 vh->vx_vni != vh2->vx_vni) {
617 NAPI_GRO_CB(p)->same_flow = 0;
622 pp = call_gro_receive(eth_gro_receive, head, skb);
626 skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
631 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
633 /* Sets 'skb->inner_mac_header' since we are always called with
634 * 'skb->encapsulation' set.
636 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
639 /* Add new entry to forwarding table -- assumes lock held */
640 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
641 const u8 *mac, union vxlan_addr *ip,
642 __u16 state, __u16 flags,
643 __be16 port, __be32 src_vni, __be32 vni,
644 __u32 ifindex, __u8 ndm_flags)
646 struct vxlan_rdst *rd = NULL;
651 f = __vxlan_find_mac(vxlan, mac, src_vni);
653 if (flags & NLM_F_EXCL) {
654 netdev_dbg(vxlan->dev,
655 "lost race to create %pM\n", mac);
658 if (f->state != state) {
660 f->updated = jiffies;
663 if (f->flags != ndm_flags) {
664 f->flags = ndm_flags;
665 f->updated = jiffies;
668 if ((flags & NLM_F_REPLACE)) {
669 /* Only change unicasts */
670 if (!(is_multicast_ether_addr(f->eth_addr) ||
671 is_zero_ether_addr(f->eth_addr))) {
672 notify |= vxlan_fdb_replace(f, ip, port, vni,
677 if ((flags & NLM_F_APPEND) &&
678 (is_multicast_ether_addr(f->eth_addr) ||
679 is_zero_ether_addr(f->eth_addr))) {
680 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
687 if (!(flags & NLM_F_CREATE))
690 if (vxlan->cfg.addrmax &&
691 vxlan->addrcnt >= vxlan->cfg.addrmax)
694 /* Disallow replace to add a multicast entry */
695 if ((flags & NLM_F_REPLACE) &&
696 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
699 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
700 f = kmalloc(sizeof(*f), GFP_ATOMIC);
706 f->flags = ndm_flags;
707 f->updated = f->used = jiffies;
709 INIT_LIST_HEAD(&f->remotes);
710 memcpy(f->eth_addr, mac, ETH_ALEN);
712 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
719 hlist_add_head_rcu(&f->hlist,
720 vxlan_fdb_head(vxlan, mac, src_vni));
725 rd = first_remote_rtnl(f);
726 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
732 static void vxlan_fdb_free(struct rcu_head *head)
734 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
735 struct vxlan_rdst *rd, *nd;
737 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
738 dst_cache_destroy(&rd->dst_cache);
744 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
746 netdev_dbg(vxlan->dev,
747 "delete %pM\n", f->eth_addr);
750 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
752 hlist_del_rcu(&f->hlist);
753 call_rcu(&f->rcu, vxlan_fdb_free);
756 static void vxlan_dst_free(struct rcu_head *head)
758 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
760 dst_cache_destroy(&rd->dst_cache);
764 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
765 struct vxlan_rdst *rd)
767 list_del_rcu(&rd->list);
768 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
769 call_rcu(&rd->rcu, vxlan_dst_free);
772 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
773 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
774 __be32 *vni, u32 *ifindex)
776 struct net *net = dev_net(vxlan->dev);
780 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
784 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
785 if (remote->sa.sa_family == AF_INET) {
786 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
787 ip->sa.sa_family = AF_INET;
788 #if IS_ENABLED(CONFIG_IPV6)
790 ip->sin6.sin6_addr = in6addr_any;
791 ip->sa.sa_family = AF_INET6;
797 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
799 *port = nla_get_be16(tb[NDA_PORT]);
801 *port = vxlan->cfg.dst_port;
805 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
807 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
809 *vni = vxlan->default_dst.remote_vni;
812 if (tb[NDA_SRC_VNI]) {
813 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
815 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
817 *src_vni = vxlan->default_dst.remote_vni;
820 if (tb[NDA_IFINDEX]) {
821 struct net_device *tdev;
823 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
825 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
826 tdev = __dev_get_by_index(net, *ifindex);
828 return -EADDRNOTAVAIL;
836 /* Add static entry (via netlink) */
837 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
838 struct net_device *dev,
839 const unsigned char *addr, u16 vid, u16 flags)
841 struct vxlan_dev *vxlan = netdev_priv(dev);
842 /* struct net *net = dev_net(vxlan->dev); */
849 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
850 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
855 if (tb[NDA_DST] == NULL)
858 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
862 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
863 return -EAFNOSUPPORT;
865 spin_lock_bh(&vxlan->hash_lock);
866 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
867 port, src_vni, vni, ifindex, ndm->ndm_flags);
868 spin_unlock_bh(&vxlan->hash_lock);
873 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
874 const unsigned char *addr, union vxlan_addr ip,
875 __be16 port, __be32 src_vni, __be32 vni,
876 u32 ifindex, u16 vid)
879 struct vxlan_rdst *rd = NULL;
882 f = vxlan_find_mac(vxlan, addr, src_vni);
886 if (!vxlan_addr_any(&ip)) {
887 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
892 /* remove a destination if it's not the only one on the list,
893 * otherwise destroy the fdb entry
895 if (rd && !list_is_singular(&f->remotes)) {
896 vxlan_fdb_dst_destroy(vxlan, f, rd);
900 vxlan_fdb_destroy(vxlan, f);
906 /* Delete entry (via netlink) */
907 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
908 struct net_device *dev,
909 const unsigned char *addr, u16 vid)
911 struct vxlan_dev *vxlan = netdev_priv(dev);
918 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
922 spin_lock_bh(&vxlan->hash_lock);
923 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
925 spin_unlock_bh(&vxlan->hash_lock);
930 /* Dump forwarding table */
931 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
932 struct net_device *dev,
933 struct net_device *filter_dev, int *idx)
935 struct vxlan_dev *vxlan = netdev_priv(dev);
939 for (h = 0; h < FDB_HASH_SIZE; ++h) {
942 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
943 struct vxlan_rdst *rd;
945 list_for_each_entry_rcu(rd, &f->remotes, list) {
946 if (*idx < cb->args[2])
949 err = vxlan_fdb_info(skb, vxlan, f,
950 NETLINK_CB(cb->skb).portid,
965 /* Watch incoming packets to learn mapping between Ethernet address
966 * and Tunnel endpoint.
967 * Return true if packet is bogus and should be dropped.
969 static bool vxlan_snoop(struct net_device *dev,
970 union vxlan_addr *src_ip, const u8 *src_mac,
971 u32 src_ifindex, __be32 vni)
973 struct vxlan_dev *vxlan = netdev_priv(dev);
977 #if IS_ENABLED(CONFIG_IPV6)
978 if (src_ip->sa.sa_family == AF_INET6 &&
979 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
980 ifindex = src_ifindex;
983 f = vxlan_find_mac(vxlan, src_mac, vni);
985 struct vxlan_rdst *rdst = first_remote_rcu(f);
987 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
988 rdst->remote_ifindex == ifindex))
991 /* Don't migrate static entries, drop packets */
992 if (f->state & (NUD_PERMANENT | NUD_NOARP))
997 "%pM migrated from %pIS to %pIS\n",
998 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1000 rdst->remote_ip = *src_ip;
1001 f->updated = jiffies;
1002 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1004 /* learned new entry */
1005 spin_lock(&vxlan->hash_lock);
1007 /* close off race between vxlan_flush and incoming packets */
1008 if (netif_running(dev))
1009 vxlan_fdb_create(vxlan, src_mac, src_ip,
1011 NLM_F_EXCL|NLM_F_CREATE,
1012 vxlan->cfg.dst_port,
1014 vxlan->default_dst.remote_vni,
1016 spin_unlock(&vxlan->hash_lock);
1022 /* See if multicast group is already in use by other ID */
1023 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1025 struct vxlan_dev *vxlan;
1026 struct vxlan_sock *sock4;
1027 #if IS_ENABLED(CONFIG_IPV6)
1028 struct vxlan_sock *sock6;
1030 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1032 sock4 = rtnl_dereference(dev->vn4_sock);
1034 /* The vxlan_sock is only used by dev, leaving group has
1035 * no effect on other vxlan devices.
1037 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1039 #if IS_ENABLED(CONFIG_IPV6)
1040 sock6 = rtnl_dereference(dev->vn6_sock);
1041 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1045 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1046 if (!netif_running(vxlan->dev) || vxlan == dev)
1049 if (family == AF_INET &&
1050 rtnl_dereference(vxlan->vn4_sock) != sock4)
1052 #if IS_ENABLED(CONFIG_IPV6)
1053 if (family == AF_INET6 &&
1054 rtnl_dereference(vxlan->vn6_sock) != sock6)
1058 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1059 &dev->default_dst.remote_ip))
1062 if (vxlan->default_dst.remote_ifindex !=
1063 dev->default_dst.remote_ifindex)
1072 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1074 struct vxlan_net *vn;
1078 if (!refcount_dec_and_test(&vs->refcnt))
1081 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1082 spin_lock(&vn->sock_lock);
1083 hlist_del_rcu(&vs->hlist);
1084 udp_tunnel_notify_del_rx_port(vs->sock,
1085 (vs->flags & VXLAN_F_GPE) ?
1086 UDP_TUNNEL_TYPE_VXLAN_GPE :
1087 UDP_TUNNEL_TYPE_VXLAN);
1088 spin_unlock(&vn->sock_lock);
1093 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1095 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1096 #if IS_ENABLED(CONFIG_IPV6)
1097 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1099 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1102 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1105 vxlan_vs_del_dev(vxlan);
1107 if (__vxlan_sock_release_prep(sock4)) {
1108 udp_tunnel_sock_release(sock4->sock);
1112 #if IS_ENABLED(CONFIG_IPV6)
1113 if (__vxlan_sock_release_prep(sock6)) {
1114 udp_tunnel_sock_release(sock6->sock);
1120 /* Update multicast group membership when first VNI on
1121 * multicast address is brought up
1123 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1126 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1127 int ifindex = vxlan->default_dst.remote_ifindex;
1130 if (ip->sa.sa_family == AF_INET) {
1131 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1132 struct ip_mreqn mreq = {
1133 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1134 .imr_ifindex = ifindex,
1137 sk = sock4->sock->sk;
1139 ret = ip_mc_join_group(sk, &mreq);
1141 #if IS_ENABLED(CONFIG_IPV6)
1143 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1145 sk = sock6->sock->sk;
1147 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1148 &ip->sin6.sin6_addr);
1156 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1157 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1160 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1161 int ifindex = vxlan->default_dst.remote_ifindex;
1164 if (ip->sa.sa_family == AF_INET) {
1165 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1166 struct ip_mreqn mreq = {
1167 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1168 .imr_ifindex = ifindex,
1171 sk = sock4->sock->sk;
1173 ret = ip_mc_leave_group(sk, &mreq);
1175 #if IS_ENABLED(CONFIG_IPV6)
1177 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1179 sk = sock6->sock->sk;
1181 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1182 &ip->sin6.sin6_addr);
1190 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1191 struct sk_buff *skb, u32 vxflags)
1193 size_t start, offset;
1195 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1198 start = vxlan_rco_start(unparsed->vx_vni);
1199 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1201 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1204 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1205 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1207 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1208 unparsed->vx_vni &= VXLAN_VNI_MASK;
1212 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1213 struct sk_buff *skb, u32 vxflags,
1214 struct vxlan_metadata *md)
1216 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1217 struct metadata_dst *tun_dst;
1219 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1222 md->gbp = ntohs(gbp->policy_id);
1224 tun_dst = (struct metadata_dst *)skb_dst(skb);
1226 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1227 tun_dst->u.tun_info.options_len = sizeof(*md);
1229 if (gbp->dont_learn)
1230 md->gbp |= VXLAN_GBP_DONT_LEARN;
1232 if (gbp->policy_applied)
1233 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1235 /* In flow-based mode, GBP is carried in dst_metadata */
1236 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1237 skb->mark = md->gbp;
1239 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1242 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1244 struct sk_buff *skb, u32 vxflags)
1246 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1248 /* Need to have Next Protocol set for interfaces in GPE mode. */
1249 if (!gpe->np_applied)
1251 /* "The initial version is 0. If a receiver does not support the
1252 * version indicated it MUST drop the packet.
1254 if (gpe->version != 0)
1256 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1257 * processing MUST occur." However, we don't implement OAM
1258 * processing, thus drop the packet.
1263 *protocol = tun_p_to_eth_p(gpe->next_protocol);
1267 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1271 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1272 struct vxlan_sock *vs,
1273 struct sk_buff *skb, __be32 vni)
1275 union vxlan_addr saddr;
1276 u32 ifindex = skb->dev->ifindex;
1278 skb_reset_mac_header(skb);
1279 skb->protocol = eth_type_trans(skb, vxlan->dev);
1280 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1282 /* Ignore packet loops (and multicast echo) */
1283 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1286 /* Get address from the outer IP header */
1287 if (vxlan_get_sk_family(vs) == AF_INET) {
1288 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1289 saddr.sa.sa_family = AF_INET;
1290 #if IS_ENABLED(CONFIG_IPV6)
1292 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1293 saddr.sa.sa_family = AF_INET6;
1297 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1298 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1304 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1305 struct sk_buff *skb)
1309 if (vxlan_get_sk_family(vs) == AF_INET)
1310 err = IP_ECN_decapsulate(oiph, skb);
1311 #if IS_ENABLED(CONFIG_IPV6)
1313 err = IP6_ECN_decapsulate(oiph, skb);
1316 if (unlikely(err) && log_ecn_error) {
1317 if (vxlan_get_sk_family(vs) == AF_INET)
1318 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1319 &((struct iphdr *)oiph)->saddr,
1320 ((struct iphdr *)oiph)->tos);
1322 net_info_ratelimited("non-ECT from %pI6\n",
1323 &((struct ipv6hdr *)oiph)->saddr);
1328 /* Callback from net/ipv4/udp.c to receive packets */
1329 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1331 struct pcpu_sw_netstats *stats;
1332 struct vxlan_dev *vxlan;
1333 struct vxlan_sock *vs;
1334 struct vxlanhdr unparsed;
1335 struct vxlan_metadata _md;
1336 struct vxlan_metadata *md = &_md;
1337 __be16 protocol = htons(ETH_P_TEB);
1338 bool raw_proto = false;
1342 /* Need UDP and VXLAN header to be present */
1343 if (!pskb_may_pull(skb, VXLAN_HLEN))
1346 unparsed = *vxlan_hdr(skb);
1347 /* VNI flag always required to be set */
1348 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1349 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1350 ntohl(vxlan_hdr(skb)->vx_flags),
1351 ntohl(vxlan_hdr(skb)->vx_vni));
1352 /* Return non vxlan pkt */
1355 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1356 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1358 vs = rcu_dereference_sk_user_data(sk);
1362 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1364 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1368 /* For backwards compatibility, only allow reserved fields to be
1369 * used by VXLAN extensions if explicitly requested.
1371 if (vs->flags & VXLAN_F_GPE) {
1372 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1377 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1378 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1381 if (vxlan_collect_metadata(vs)) {
1382 struct metadata_dst *tun_dst;
1384 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1385 key32_to_tunnel_id(vni), sizeof(*md));
1390 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1392 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1394 memset(md, 0, sizeof(*md));
1397 if (vs->flags & VXLAN_F_REMCSUM_RX)
1398 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1400 if (vs->flags & VXLAN_F_GBP)
1401 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1402 /* Note that GBP and GPE can never be active together. This is
1403 * ensured in vxlan_dev_configure.
1406 if (unparsed.vx_flags || unparsed.vx_vni) {
1407 /* If there are any unprocessed flags remaining treat
1408 * this as a malformed packet. This behavior diverges from
1409 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1410 * in reserved fields are to be ignored. The approach here
1411 * maintains compatibility with previous stack code, and also
1412 * is more robust and provides a little more security in
1413 * adding extensions to VXLAN.
1419 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1422 skb_reset_mac_header(skb);
1423 skb->dev = vxlan->dev;
1424 skb->pkt_type = PACKET_HOST;
1427 oiph = skb_network_header(skb);
1428 skb_reset_network_header(skb);
1430 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1431 ++vxlan->dev->stats.rx_frame_errors;
1432 ++vxlan->dev->stats.rx_errors;
1436 stats = this_cpu_ptr(vxlan->dev->tstats);
1437 u64_stats_update_begin(&stats->syncp);
1438 stats->rx_packets++;
1439 stats->rx_bytes += skb->len;
1440 u64_stats_update_end(&stats->syncp);
1442 gro_cells_receive(&vxlan->gro_cells, skb);
1446 /* Consume bad packet */
1451 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1453 struct vxlan_dev *vxlan = netdev_priv(dev);
1454 struct arphdr *parp;
1457 struct neighbour *n;
1459 if (dev->flags & IFF_NOARP)
1462 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1463 dev->stats.tx_dropped++;
1466 parp = arp_hdr(skb);
1468 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1469 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1470 parp->ar_pro != htons(ETH_P_IP) ||
1471 parp->ar_op != htons(ARPOP_REQUEST) ||
1472 parp->ar_hln != dev->addr_len ||
1475 arpptr = (u8 *)parp + sizeof(struct arphdr);
1477 arpptr += dev->addr_len; /* sha */
1478 memcpy(&sip, arpptr, sizeof(sip));
1479 arpptr += sizeof(sip);
1480 arpptr += dev->addr_len; /* tha */
1481 memcpy(&tip, arpptr, sizeof(tip));
1483 if (ipv4_is_loopback(tip) ||
1484 ipv4_is_multicast(tip))
1487 n = neigh_lookup(&arp_tbl, &tip, dev);
1490 struct vxlan_fdb *f;
1491 struct sk_buff *reply;
1493 if (!(n->nud_state & NUD_CONNECTED)) {
1498 f = vxlan_find_mac(vxlan, n->ha, vni);
1499 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1500 /* bridge-local neighbor */
1505 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1513 skb_reset_mac_header(reply);
1514 __skb_pull(reply, skb_network_offset(reply));
1515 reply->ip_summed = CHECKSUM_UNNECESSARY;
1516 reply->pkt_type = PACKET_HOST;
1518 if (netif_rx_ni(reply) == NET_RX_DROP)
1519 dev->stats.rx_dropped++;
1520 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1521 union vxlan_addr ipa = {
1522 .sin.sin_addr.s_addr = tip,
1523 .sin.sin_family = AF_INET,
1526 vxlan_ip_miss(dev, &ipa);
1530 return NETDEV_TX_OK;
1533 #if IS_ENABLED(CONFIG_IPV6)
1534 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1535 struct neighbour *n, bool isrouter)
1537 struct net_device *dev = request->dev;
1538 struct sk_buff *reply;
1539 struct nd_msg *ns, *na;
1540 struct ipv6hdr *pip6;
1542 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1546 if (dev == NULL || !pskb_may_pull(request, request->len))
1549 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1550 sizeof(*na) + na_olen + dev->needed_tailroom;
1551 reply = alloc_skb(len, GFP_ATOMIC);
1555 reply->protocol = htons(ETH_P_IPV6);
1557 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1558 skb_push(reply, sizeof(struct ethhdr));
1559 skb_reset_mac_header(reply);
1561 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1563 daddr = eth_hdr(request)->h_source;
1564 ns_olen = request->len - skb_network_offset(request) -
1565 sizeof(struct ipv6hdr) - sizeof(*ns);
1566 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1567 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1568 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1573 /* Ethernet header */
1574 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1575 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1576 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1577 reply->protocol = htons(ETH_P_IPV6);
1579 skb_pull(reply, sizeof(struct ethhdr));
1580 skb_reset_network_header(reply);
1581 skb_put(reply, sizeof(struct ipv6hdr));
1585 pip6 = ipv6_hdr(reply);
1586 memset(pip6, 0, sizeof(struct ipv6hdr));
1588 pip6->priority = ipv6_hdr(request)->priority;
1589 pip6->nexthdr = IPPROTO_ICMPV6;
1590 pip6->hop_limit = 255;
1591 pip6->daddr = ipv6_hdr(request)->saddr;
1592 pip6->saddr = *(struct in6_addr *)n->primary_key;
1594 skb_pull(reply, sizeof(struct ipv6hdr));
1595 skb_reset_transport_header(reply);
1597 /* Neighbor Advertisement */
1598 na = skb_put_zero(reply, sizeof(*na) + na_olen);
1599 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1600 na->icmph.icmp6_router = isrouter;
1601 na->icmph.icmp6_override = 1;
1602 na->icmph.icmp6_solicited = 1;
1603 na->target = ns->target;
1604 ether_addr_copy(&na->opt[2], n->ha);
1605 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1606 na->opt[1] = na_olen >> 3;
1608 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1609 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1610 csum_partial(na, sizeof(*na)+na_olen, 0));
1612 pip6->payload_len = htons(sizeof(*na)+na_olen);
1614 skb_push(reply, sizeof(struct ipv6hdr));
1616 reply->ip_summed = CHECKSUM_UNNECESSARY;
1621 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1623 struct vxlan_dev *vxlan = netdev_priv(dev);
1624 const struct in6_addr *daddr;
1625 const struct ipv6hdr *iphdr;
1626 struct inet6_dev *in6_dev;
1627 struct neighbour *n;
1630 in6_dev = __in6_dev_get(dev);
1634 iphdr = ipv6_hdr(skb);
1635 daddr = &iphdr->daddr;
1636 msg = (struct nd_msg *)(iphdr + 1);
1638 if (ipv6_addr_loopback(daddr) ||
1639 ipv6_addr_is_multicast(&msg->target))
1642 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1645 struct vxlan_fdb *f;
1646 struct sk_buff *reply;
1648 if (!(n->nud_state & NUD_CONNECTED)) {
1653 f = vxlan_find_mac(vxlan, n->ha, vni);
1654 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1655 /* bridge-local neighbor */
1660 reply = vxlan_na_create(skb, n,
1661 !!(f ? f->flags & NTF_ROUTER : 0));
1668 if (netif_rx_ni(reply) == NET_RX_DROP)
1669 dev->stats.rx_dropped++;
1671 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1672 union vxlan_addr ipa = {
1673 .sin6.sin6_addr = msg->target,
1674 .sin6.sin6_family = AF_INET6,
1677 vxlan_ip_miss(dev, &ipa);
1682 return NETDEV_TX_OK;
1686 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1688 struct vxlan_dev *vxlan = netdev_priv(dev);
1689 struct neighbour *n;
1691 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1695 switch (ntohs(eth_hdr(skb)->h_proto)) {
1700 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1703 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1704 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1705 union vxlan_addr ipa = {
1706 .sin.sin_addr.s_addr = pip->daddr,
1707 .sin.sin_family = AF_INET,
1710 vxlan_ip_miss(dev, &ipa);
1716 #if IS_ENABLED(CONFIG_IPV6)
1719 struct ipv6hdr *pip6;
1721 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1723 pip6 = ipv6_hdr(skb);
1724 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1725 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1726 union vxlan_addr ipa = {
1727 .sin6.sin6_addr = pip6->daddr,
1728 .sin6.sin6_family = AF_INET6,
1731 vxlan_ip_miss(dev, &ipa);
1745 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1747 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1749 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1758 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1759 struct vxlan_metadata *md)
1761 struct vxlanhdr_gbp *gbp;
1766 gbp = (struct vxlanhdr_gbp *)vxh;
1767 vxh->vx_flags |= VXLAN_HF_GBP;
1769 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1770 gbp->dont_learn = 1;
1772 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1773 gbp->policy_applied = 1;
1775 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1778 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1781 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1783 gpe->np_applied = 1;
1784 gpe->next_protocol = tun_p_from_eth_p(protocol);
1785 if (!gpe->next_protocol)
1786 return -EPFNOSUPPORT;
1790 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1791 int iphdr_len, __be32 vni,
1792 struct vxlan_metadata *md, u32 vxflags,
1795 struct vxlanhdr *vxh;
1798 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1799 __be16 inner_protocol = htons(ETH_P_TEB);
1801 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1802 skb->ip_summed == CHECKSUM_PARTIAL) {
1803 int csum_start = skb_checksum_start_offset(skb);
1805 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1806 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1807 (skb->csum_offset == offsetof(struct udphdr, check) ||
1808 skb->csum_offset == offsetof(struct tcphdr, check)))
1809 type |= SKB_GSO_TUNNEL_REMCSUM;
1812 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1813 + VXLAN_HLEN + iphdr_len;
1815 /* Need space for new headers (invalidates iph ptr) */
1816 err = skb_cow_head(skb, min_headroom);
1820 err = iptunnel_handle_offloads(skb, type);
1824 vxh = __skb_push(skb, sizeof(*vxh));
1825 vxh->vx_flags = VXLAN_HF_VNI;
1826 vxh->vx_vni = vxlan_vni_field(vni);
1828 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1831 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1832 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1833 vxh->vx_flags |= VXLAN_HF_RCO;
1835 if (!skb_is_gso(skb)) {
1836 skb->ip_summed = CHECKSUM_NONE;
1837 skb->encapsulation = 0;
1841 if (vxflags & VXLAN_F_GBP)
1842 vxlan_build_gbp_hdr(vxh, vxflags, md);
1843 if (vxflags & VXLAN_F_GPE) {
1844 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1847 inner_protocol = skb->protocol;
1850 skb_set_inner_protocol(skb, inner_protocol);
1854 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1855 struct vxlan_sock *sock4,
1856 struct sk_buff *skb, int oif, u8 tos,
1857 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1858 struct dst_cache *dst_cache,
1859 const struct ip_tunnel_info *info)
1861 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1862 struct rtable *rt = NULL;
1866 return ERR_PTR(-EIO);
1871 rt = dst_cache_get_ip4(dst_cache, saddr);
1876 memset(&fl4, 0, sizeof(fl4));
1877 fl4.flowi4_oif = oif;
1878 fl4.flowi4_tos = RT_TOS(tos);
1879 fl4.flowi4_mark = skb->mark;
1880 fl4.flowi4_proto = IPPROTO_UDP;
1883 fl4.fl4_dport = dport;
1884 fl4.fl4_sport = sport;
1886 rt = ip_route_output_key(vxlan->net, &fl4);
1887 if (likely(!IS_ERR(rt))) {
1888 if (rt->dst.dev == dev) {
1889 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1891 return ERR_PTR(-ELOOP);
1896 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1898 netdev_dbg(dev, "no route to %pI4\n", &daddr);
1899 return ERR_PTR(-ENETUNREACH);
1904 #if IS_ENABLED(CONFIG_IPV6)
1905 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1906 struct net_device *dev,
1907 struct vxlan_sock *sock6,
1908 struct sk_buff *skb, int oif, u8 tos,
1910 const struct in6_addr *daddr,
1911 struct in6_addr *saddr,
1912 __be16 dport, __be16 sport,
1913 struct dst_cache *dst_cache,
1914 const struct ip_tunnel_info *info)
1916 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1917 struct dst_entry *ndst;
1922 return ERR_PTR(-EIO);
1927 ndst = dst_cache_get_ip6(dst_cache, saddr);
1932 memset(&fl6, 0, sizeof(fl6));
1933 fl6.flowi6_oif = oif;
1936 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1937 fl6.flowi6_mark = skb->mark;
1938 fl6.flowi6_proto = IPPROTO_UDP;
1939 fl6.fl6_dport = dport;
1940 fl6.fl6_sport = sport;
1942 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1945 if (unlikely(err < 0)) {
1946 netdev_dbg(dev, "no route to %pI6\n", daddr);
1947 return ERR_PTR(-ENETUNREACH);
1950 if (unlikely(ndst->dev == dev)) {
1951 netdev_dbg(dev, "circular route to %pI6\n", daddr);
1953 return ERR_PTR(-ELOOP);
1958 dst_cache_set_ip6(dst_cache, ndst, saddr);
1963 /* Bypass encapsulation if the destination is local */
1964 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1965 struct vxlan_dev *dst_vxlan, __be32 vni)
1967 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1968 union vxlan_addr loopback;
1969 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1970 struct net_device *dev = skb->dev;
1973 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1974 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1975 skb->pkt_type = PACKET_HOST;
1976 skb->encapsulation = 0;
1977 skb->dev = dst_vxlan->dev;
1978 __skb_pull(skb, skb_network_offset(skb));
1980 if (remote_ip->sa.sa_family == AF_INET) {
1981 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1982 loopback.sa.sa_family = AF_INET;
1983 #if IS_ENABLED(CONFIG_IPV6)
1985 loopback.sin6.sin6_addr = in6addr_loopback;
1986 loopback.sa.sa_family = AF_INET6;
1990 if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
1991 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source, 0,
1994 u64_stats_update_begin(&tx_stats->syncp);
1995 tx_stats->tx_packets++;
1996 tx_stats->tx_bytes += len;
1997 u64_stats_update_end(&tx_stats->syncp);
1999 if (netif_rx(skb) == NET_RX_SUCCESS) {
2000 u64_stats_update_begin(&rx_stats->syncp);
2001 rx_stats->rx_packets++;
2002 rx_stats->rx_bytes += len;
2003 u64_stats_update_end(&rx_stats->syncp);
2005 dev->stats.rx_dropped++;
2009 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2010 struct vxlan_dev *vxlan,
2011 union vxlan_addr *daddr,
2012 __be16 dst_port, int dst_ifindex, __be32 vni,
2013 struct dst_entry *dst,
2016 #if IS_ENABLED(CONFIG_IPV6)
2017 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2018 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2019 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2021 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2023 /* Bypass encapsulation if the destination is local */
2024 if (rt_flags & RTCF_LOCAL &&
2025 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2026 struct vxlan_dev *dst_vxlan;
2029 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2030 daddr->sa.sa_family, dst_port,
2033 dev->stats.tx_errors++;
2038 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2045 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2046 __be32 default_vni, struct vxlan_rdst *rdst,
2049 struct dst_cache *dst_cache;
2050 struct ip_tunnel_info *info;
2051 struct vxlan_dev *vxlan = netdev_priv(dev);
2052 const struct iphdr *old_iph = ip_hdr(skb);
2053 union vxlan_addr *dst;
2054 union vxlan_addr remote_ip, local_ip;
2055 struct vxlan_metadata _md;
2056 struct vxlan_metadata *md = &_md;
2057 __be16 src_port = 0, dst_port;
2058 struct dst_entry *ndst = NULL;
2063 u32 flags = vxlan->cfg.flags;
2064 bool udp_sum = false;
2065 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2067 info = skb_tunnel_info(skb);
2070 dst = &rdst->remote_ip;
2071 if (vxlan_addr_any(dst)) {
2073 /* short-circuited back to local bridge */
2074 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2080 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2081 vni = (rdst->remote_vni) ? : default_vni;
2082 ifindex = rdst->remote_ifindex;
2083 local_ip = vxlan->cfg.saddr;
2084 dst_cache = &rdst->dst_cache;
2085 md->gbp = skb->mark;
2086 if (flags & VXLAN_F_TTL_INHERIT) {
2087 ttl = ip_tunnel_get_ttl(old_iph, skb);
2089 ttl = vxlan->cfg.ttl;
2090 if (!ttl && vxlan_addr_multicast(dst))
2094 tos = vxlan->cfg.tos;
2096 tos = ip_tunnel_get_dsfield(old_iph, skb);
2098 if (dst->sa.sa_family == AF_INET)
2099 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2101 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2102 label = vxlan->cfg.label;
2105 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2109 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2110 if (remote_ip.sa.sa_family == AF_INET) {
2111 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2112 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2114 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2115 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2118 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2119 vni = tunnel_id_to_key32(info->key.tun_id);
2121 dst_cache = &info->dst_cache;
2122 if (info->options_len)
2123 md = ip_tunnel_info_opts(info);
2124 ttl = info->key.ttl;
2125 tos = info->key.tos;
2126 label = info->key.label;
2127 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2129 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2130 vxlan->cfg.port_max, true);
2133 if (dst->sa.sa_family == AF_INET) {
2134 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2138 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2139 dst->sin.sin_addr.s_addr,
2140 &local_ip.sin.sin_addr.s_addr,
2148 /* Bypass encapsulation if the destination is local */
2150 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2151 dst_port, ifindex, vni,
2152 &rt->dst, rt->rt_flags);
2155 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2161 int mtu = dst_mtu(ndst) - VXLAN_HEADROOM;
2163 skb_dst_update_pmtu(skb, mtu);
2166 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2167 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2168 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2169 vni, md, flags, udp_sum);
2173 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2174 dst->sin.sin_addr.s_addr, tos, ttl, df,
2175 src_port, dst_port, xnet, !udp_sum);
2176 #if IS_ENABLED(CONFIG_IPV6)
2178 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2180 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2181 label, &dst->sin6.sin6_addr,
2182 &local_ip.sin6.sin6_addr,
2186 err = PTR_ERR(ndst);
2192 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2194 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2195 dst_port, ifindex, vni,
2202 int mtu = dst_mtu(ndst) - VXLAN6_HEADROOM;
2204 skb_dst_update_pmtu(skb, mtu);
2207 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2208 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2209 skb_scrub_packet(skb, xnet);
2210 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2211 vni, md, flags, udp_sum);
2215 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2216 &local_ip.sin6.sin6_addr,
2217 &dst->sin6.sin6_addr, tos, ttl,
2218 label, src_port, dst_port, !udp_sum);
2226 dev->stats.tx_dropped++;
2233 dev->stats.collisions++;
2234 else if (err == -ENETUNREACH)
2235 dev->stats.tx_carrier_errors++;
2237 dev->stats.tx_errors++;
2241 /* Transmit local packets over Vxlan
2243 * Outer IP header inherits ECN and DF from inner header.
2244 * Outer UDP destination is the VXLAN assigned port.
2245 * source port is based on hash of flow
2247 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2249 struct vxlan_dev *vxlan = netdev_priv(dev);
2250 struct vxlan_rdst *rdst, *fdst = NULL;
2251 const struct ip_tunnel_info *info;
2252 bool did_rsc = false;
2253 struct vxlan_fdb *f;
2257 info = skb_tunnel_info(skb);
2259 skb_reset_mac_header(skb);
2261 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2262 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2263 info->mode & IP_TUNNEL_INFO_TX) {
2264 vni = tunnel_id_to_key32(info->key.tun_id);
2266 if (info && info->mode & IP_TUNNEL_INFO_TX)
2267 vxlan_xmit_one(skb, dev, vni, NULL, false);
2270 return NETDEV_TX_OK;
2274 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2276 if (ntohs(eth->h_proto) == ETH_P_ARP)
2277 return arp_reduce(dev, skb, vni);
2278 #if IS_ENABLED(CONFIG_IPV6)
2279 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2280 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2281 sizeof(struct nd_msg)) &&
2282 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2283 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2285 if (m->icmph.icmp6_code == 0 &&
2286 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2287 return neigh_reduce(dev, skb, vni);
2293 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2296 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2297 (ntohs(eth->h_proto) == ETH_P_IP ||
2298 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2299 did_rsc = route_shortcircuit(dev, skb);
2301 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2305 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2307 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2308 !is_multicast_ether_addr(eth->h_dest))
2309 vxlan_fdb_miss(vxlan, eth->h_dest);
2311 dev->stats.tx_dropped++;
2313 return NETDEV_TX_OK;
2317 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2318 struct sk_buff *skb1;
2324 skb1 = skb_clone(skb, GFP_ATOMIC);
2326 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2330 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2333 return NETDEV_TX_OK;
2336 /* Walk the forwarding table and purge stale entries */
2337 static void vxlan_cleanup(struct timer_list *t)
2339 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2340 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2343 if (!netif_running(vxlan->dev))
2346 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2347 struct hlist_node *p, *n;
2349 spin_lock_bh(&vxlan->hash_lock);
2350 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2352 = container_of(p, struct vxlan_fdb, hlist);
2353 unsigned long timeout;
2355 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2358 if (f->flags & NTF_EXT_LEARNED)
2361 timeout = f->used + vxlan->cfg.age_interval * HZ;
2362 if (time_before_eq(timeout, jiffies)) {
2363 netdev_dbg(vxlan->dev,
2364 "garbage collect %pM\n",
2366 f->state = NUD_STALE;
2367 vxlan_fdb_destroy(vxlan, f);
2368 } else if (time_before(timeout, next_timer))
2369 next_timer = timeout;
2371 spin_unlock_bh(&vxlan->hash_lock);
2374 mod_timer(&vxlan->age_timer, next_timer);
2377 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2379 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2381 spin_lock(&vn->sock_lock);
2382 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2383 #if IS_ENABLED(CONFIG_IPV6)
2384 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2386 spin_unlock(&vn->sock_lock);
2389 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2390 struct vxlan_dev_node *node)
2392 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2393 __be32 vni = vxlan->default_dst.remote_vni;
2395 node->vxlan = vxlan;
2396 spin_lock(&vn->sock_lock);
2397 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2398 spin_unlock(&vn->sock_lock);
2401 /* Setup stats when device is created */
2402 static int vxlan_init(struct net_device *dev)
2404 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2411 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2413 struct vxlan_fdb *f;
2415 spin_lock_bh(&vxlan->hash_lock);
2416 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2418 vxlan_fdb_destroy(vxlan, f);
2419 spin_unlock_bh(&vxlan->hash_lock);
2422 static void vxlan_uninit(struct net_device *dev)
2424 struct vxlan_dev *vxlan = netdev_priv(dev);
2426 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2428 free_percpu(dev->tstats);
2431 /* Start ageing timer and join group when device is brought up */
2432 static int vxlan_open(struct net_device *dev)
2434 struct vxlan_dev *vxlan = netdev_priv(dev);
2437 ret = vxlan_sock_add(vxlan);
2441 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2442 ret = vxlan_igmp_join(vxlan);
2443 if (ret == -EADDRINUSE)
2446 vxlan_sock_release(vxlan);
2451 if (vxlan->cfg.age_interval)
2452 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2457 /* Purge the forwarding table */
2458 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2462 spin_lock_bh(&vxlan->hash_lock);
2463 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2464 struct hlist_node *p, *n;
2465 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2467 = container_of(p, struct vxlan_fdb, hlist);
2468 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2470 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2471 if (!is_zero_ether_addr(f->eth_addr))
2472 vxlan_fdb_destroy(vxlan, f);
2475 spin_unlock_bh(&vxlan->hash_lock);
2478 /* Cleanup timer and forwarding table on shutdown */
2479 static int vxlan_stop(struct net_device *dev)
2481 struct vxlan_dev *vxlan = netdev_priv(dev);
2482 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2485 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2486 !vxlan_group_used(vn, vxlan))
2487 ret = vxlan_igmp_leave(vxlan);
2489 del_timer_sync(&vxlan->age_timer);
2491 vxlan_flush(vxlan, false);
2492 vxlan_sock_release(vxlan);
2497 /* Stub, nothing needs to be done. */
2498 static void vxlan_set_multicast_list(struct net_device *dev)
2502 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2504 struct vxlan_dev *vxlan = netdev_priv(dev);
2505 struct vxlan_rdst *dst = &vxlan->default_dst;
2506 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2507 dst->remote_ifindex);
2508 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2510 /* This check is different than dev->max_mtu, because it looks at
2511 * the lowerdev->mtu, rather than the static dev->max_mtu
2514 int max_mtu = lowerdev->mtu -
2515 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2516 if (new_mtu > max_mtu)
2524 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2526 struct vxlan_dev *vxlan = netdev_priv(dev);
2527 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2528 __be16 sport, dport;
2530 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2531 vxlan->cfg.port_max, true);
2532 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2534 if (ip_tunnel_info_af(info) == AF_INET) {
2535 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2538 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2539 info->key.u.ipv4.dst,
2540 &info->key.u.ipv4.src, dport, sport,
2541 &info->dst_cache, info);
2546 #if IS_ENABLED(CONFIG_IPV6)
2547 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2548 struct dst_entry *ndst;
2550 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2551 info->key.label, &info->key.u.ipv6.dst,
2552 &info->key.u.ipv6.src, dport, sport,
2553 &info->dst_cache, info);
2555 return PTR_ERR(ndst);
2557 #else /* !CONFIG_IPV6 */
2558 return -EPFNOSUPPORT;
2561 info->key.tp_src = sport;
2562 info->key.tp_dst = dport;
2566 static const struct net_device_ops vxlan_netdev_ether_ops = {
2567 .ndo_init = vxlan_init,
2568 .ndo_uninit = vxlan_uninit,
2569 .ndo_open = vxlan_open,
2570 .ndo_stop = vxlan_stop,
2571 .ndo_start_xmit = vxlan_xmit,
2572 .ndo_get_stats64 = ip_tunnel_get_stats64,
2573 .ndo_set_rx_mode = vxlan_set_multicast_list,
2574 .ndo_change_mtu = vxlan_change_mtu,
2575 .ndo_validate_addr = eth_validate_addr,
2576 .ndo_set_mac_address = eth_mac_addr,
2577 .ndo_fdb_add = vxlan_fdb_add,
2578 .ndo_fdb_del = vxlan_fdb_delete,
2579 .ndo_fdb_dump = vxlan_fdb_dump,
2580 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2583 static const struct net_device_ops vxlan_netdev_raw_ops = {
2584 .ndo_init = vxlan_init,
2585 .ndo_uninit = vxlan_uninit,
2586 .ndo_open = vxlan_open,
2587 .ndo_stop = vxlan_stop,
2588 .ndo_start_xmit = vxlan_xmit,
2589 .ndo_get_stats64 = ip_tunnel_get_stats64,
2590 .ndo_change_mtu = vxlan_change_mtu,
2591 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2594 /* Info for udev, that this is a virtual tunnel endpoint */
2595 static struct device_type vxlan_type = {
2599 /* Calls the ndo_udp_tunnel_add of the caller in order to
2600 * supply the listening VXLAN udp ports. Callers are expected
2601 * to implement the ndo_udp_tunnel_add.
2603 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2605 struct vxlan_sock *vs;
2606 struct net *net = dev_net(dev);
2607 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2610 spin_lock(&vn->sock_lock);
2611 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2612 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2613 unsigned short type;
2615 if (vs->flags & VXLAN_F_GPE)
2616 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
2618 type = UDP_TUNNEL_TYPE_VXLAN;
2621 udp_tunnel_push_rx_port(dev, vs->sock, type);
2623 udp_tunnel_drop_rx_port(dev, vs->sock, type);
2626 spin_unlock(&vn->sock_lock);
2629 /* Initialize the device structure. */
2630 static void vxlan_setup(struct net_device *dev)
2632 struct vxlan_dev *vxlan = netdev_priv(dev);
2635 eth_hw_addr_random(dev);
2638 dev->needs_free_netdev = true;
2639 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2641 dev->features |= NETIF_F_LLTX;
2642 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2643 dev->features |= NETIF_F_RXCSUM;
2644 dev->features |= NETIF_F_GSO_SOFTWARE;
2646 dev->vlan_features = dev->features;
2647 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2648 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2649 netif_keep_dst(dev);
2650 dev->priv_flags |= IFF_NO_QUEUE;
2652 /* MTU range: 68 - 65535 */
2653 dev->min_mtu = ETH_MIN_MTU;
2654 dev->max_mtu = ETH_MAX_MTU;
2656 INIT_LIST_HEAD(&vxlan->next);
2657 spin_lock_init(&vxlan->hash_lock);
2659 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
2663 gro_cells_init(&vxlan->gro_cells, dev);
2665 for (h = 0; h < FDB_HASH_SIZE; ++h)
2666 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2669 static void vxlan_ether_setup(struct net_device *dev)
2671 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2672 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2673 dev->netdev_ops = &vxlan_netdev_ether_ops;
2676 static void vxlan_raw_setup(struct net_device *dev)
2678 dev->header_ops = NULL;
2679 dev->type = ARPHRD_NONE;
2680 dev->hard_header_len = 0;
2682 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2683 dev->netdev_ops = &vxlan_netdev_raw_ops;
2686 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2687 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2688 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2689 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2690 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2691 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2692 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2693 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2694 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2695 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2696 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2697 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2698 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2699 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2700 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2701 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2702 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2703 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2704 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2705 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2706 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2707 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2708 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2709 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2710 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2711 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2712 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2713 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2714 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
2717 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
2718 struct netlink_ext_ack *extack)
2720 if (tb[IFLA_ADDRESS]) {
2721 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2722 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2723 "Provided link layer address is not Ethernet");
2727 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2728 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2729 "Provided Ethernet address is not unicast");
2730 return -EADDRNOTAVAIL;
2735 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
2737 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
2738 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
2739 "MTU must be between 68 and 65535");
2745 NL_SET_ERR_MSG(extack,
2746 "Required attributes not provided to perform the operation");
2750 if (data[IFLA_VXLAN_ID]) {
2751 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2753 if (id >= VXLAN_N_VID) {
2754 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
2755 "VXLAN ID must be lower than 16777216");
2760 if (data[IFLA_VXLAN_PORT_RANGE]) {
2761 const struct ifla_vxlan_port_range *p
2762 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2764 if (ntohs(p->high) < ntohs(p->low)) {
2765 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
2766 "Invalid source port range");
2774 static void vxlan_get_drvinfo(struct net_device *netdev,
2775 struct ethtool_drvinfo *drvinfo)
2777 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2778 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2781 static const struct ethtool_ops vxlan_ethtool_ops = {
2782 .get_drvinfo = vxlan_get_drvinfo,
2783 .get_link = ethtool_op_get_link,
2786 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2787 __be16 port, u32 flags)
2789 struct socket *sock;
2790 struct udp_port_cfg udp_conf;
2793 memset(&udp_conf, 0, sizeof(udp_conf));
2796 udp_conf.family = AF_INET6;
2797 udp_conf.use_udp6_rx_checksums =
2798 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2799 udp_conf.ipv6_v6only = 1;
2801 udp_conf.family = AF_INET;
2804 udp_conf.local_udp_port = port;
2806 /* Open UDP socket */
2807 err = udp_sock_create(net, &udp_conf, &sock);
2809 return ERR_PTR(err);
2814 /* Create new listen socket if needed */
2815 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2816 __be16 port, u32 flags)
2818 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2819 struct vxlan_sock *vs;
2820 struct socket *sock;
2822 struct udp_tunnel_sock_cfg tunnel_cfg;
2824 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2826 return ERR_PTR(-ENOMEM);
2828 for (h = 0; h < VNI_HASH_SIZE; ++h)
2829 INIT_HLIST_HEAD(&vs->vni_list[h]);
2831 sock = vxlan_create_sock(net, ipv6, port, flags);
2834 return ERR_CAST(sock);
2838 refcount_set(&vs->refcnt, 1);
2839 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2841 spin_lock(&vn->sock_lock);
2842 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2843 udp_tunnel_notify_add_rx_port(sock,
2844 (vs->flags & VXLAN_F_GPE) ?
2845 UDP_TUNNEL_TYPE_VXLAN_GPE :
2846 UDP_TUNNEL_TYPE_VXLAN);
2847 spin_unlock(&vn->sock_lock);
2849 /* Mark socket as an encapsulation socket. */
2850 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2851 tunnel_cfg.sk_user_data = vs;
2852 tunnel_cfg.encap_type = 1;
2853 tunnel_cfg.encap_rcv = vxlan_rcv;
2854 tunnel_cfg.encap_destroy = NULL;
2855 tunnel_cfg.gro_receive = vxlan_gro_receive;
2856 tunnel_cfg.gro_complete = vxlan_gro_complete;
2858 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2863 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2865 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2866 struct vxlan_sock *vs = NULL;
2867 struct vxlan_dev_node *node;
2869 if (!vxlan->cfg.no_share) {
2870 spin_lock(&vn->sock_lock);
2871 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2872 vxlan->cfg.dst_port, vxlan->cfg.flags);
2873 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
2874 spin_unlock(&vn->sock_lock);
2877 spin_unlock(&vn->sock_lock);
2880 vs = vxlan_socket_create(vxlan->net, ipv6,
2881 vxlan->cfg.dst_port, vxlan->cfg.flags);
2884 #if IS_ENABLED(CONFIG_IPV6)
2886 rcu_assign_pointer(vxlan->vn6_sock, vs);
2887 node = &vxlan->hlist6;
2891 rcu_assign_pointer(vxlan->vn4_sock, vs);
2892 node = &vxlan->hlist4;
2894 vxlan_vs_add_dev(vs, vxlan, node);
2898 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2900 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
2901 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
2902 bool ipv4 = !ipv6 || metadata;
2905 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2906 #if IS_ENABLED(CONFIG_IPV6)
2907 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2909 ret = __vxlan_sock_add(vxlan, true);
2910 if (ret < 0 && ret != -EAFNOSUPPORT)
2915 ret = __vxlan_sock_add(vxlan, false);
2917 vxlan_sock_release(vxlan);
2921 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
2922 struct net_device **lower,
2923 struct vxlan_dev *old,
2924 struct netlink_ext_ack *extack)
2926 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2927 struct vxlan_dev *tmp;
2928 bool use_ipv6 = false;
2930 if (conf->flags & VXLAN_F_GPE) {
2931 /* For now, allow GPE only together with
2932 * COLLECT_METADATA. This can be relaxed later; in such
2933 * case, the other side of the PtP link will have to be
2936 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
2937 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2938 NL_SET_ERR_MSG(extack,
2939 "VXLAN GPE does not support this combination of attributes");
2944 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
2945 /* Unless IPv6 is explicitly requested, assume IPv4 */
2946 conf->remote_ip.sa.sa_family = AF_INET;
2947 conf->saddr.sa.sa_family = AF_INET;
2948 } else if (!conf->remote_ip.sa.sa_family) {
2949 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
2950 } else if (!conf->saddr.sa.sa_family) {
2951 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
2954 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
2955 NL_SET_ERR_MSG(extack,
2956 "Local and remote address must be from the same family");
2960 if (vxlan_addr_multicast(&conf->saddr)) {
2961 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
2965 if (conf->saddr.sa.sa_family == AF_INET6) {
2966 if (!IS_ENABLED(CONFIG_IPV6)) {
2967 NL_SET_ERR_MSG(extack,
2968 "IPv6 support not enabled in the kernel");
2969 return -EPFNOSUPPORT;
2972 conf->flags |= VXLAN_F_IPV6;
2974 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2976 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
2978 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
2980 if (local_type & IPV6_ADDR_LINKLOCAL) {
2981 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
2982 (remote_type != IPV6_ADDR_ANY)) {
2983 NL_SET_ERR_MSG(extack,
2984 "Invalid combination of local and remote address scopes");
2988 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
2991 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
2992 NL_SET_ERR_MSG(extack,
2993 "Invalid combination of local and remote address scopes");
2997 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3002 if (conf->label && !use_ipv6) {
3003 NL_SET_ERR_MSG(extack,
3004 "Label attribute only applies to IPv6 VXLAN devices");
3008 if (conf->remote_ifindex) {
3009 struct net_device *lowerdev;
3011 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3013 NL_SET_ERR_MSG(extack,
3014 "Invalid local interface, device not found");
3018 #if IS_ENABLED(CONFIG_IPV6)
3020 struct inet6_dev *idev = __in6_dev_get(lowerdev);
3021 if (idev && idev->cnf.disable_ipv6) {
3022 NL_SET_ERR_MSG(extack,
3023 "IPv6 support disabled by administrator");
3031 if (vxlan_addr_multicast(&conf->remote_ip)) {
3032 NL_SET_ERR_MSG(extack,
3033 "Local interface required for multicast remote destination");
3038 #if IS_ENABLED(CONFIG_IPV6)
3039 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3040 NL_SET_ERR_MSG(extack,
3041 "Local interface required for link-local local/remote addresses");
3049 if (!conf->dst_port) {
3050 if (conf->flags & VXLAN_F_GPE)
3051 conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3053 conf->dst_port = htons(vxlan_port);
3056 if (!conf->age_interval)
3057 conf->age_interval = FDB_AGE_DEFAULT;
3059 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3063 if (tmp->cfg.vni != conf->vni)
3065 if (tmp->cfg.dst_port != conf->dst_port)
3067 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3068 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3071 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3072 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3075 NL_SET_ERR_MSG(extack,
3076 "A VXLAN device with the specified VNI already exists");
3083 static void vxlan_config_apply(struct net_device *dev,
3084 struct vxlan_config *conf,
3085 struct net_device *lowerdev,
3086 struct net *src_net,
3089 struct vxlan_dev *vxlan = netdev_priv(dev);
3090 struct vxlan_rdst *dst = &vxlan->default_dst;
3091 unsigned short needed_headroom = ETH_HLEN;
3092 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3093 int max_mtu = ETH_MAX_MTU;
3096 if (conf->flags & VXLAN_F_GPE)
3097 vxlan_raw_setup(dev);
3099 vxlan_ether_setup(dev);
3102 dev->mtu = conf->mtu;
3104 vxlan->net = src_net;
3107 dst->remote_vni = conf->vni;
3109 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3112 dst->remote_ifindex = conf->remote_ifindex;
3114 dev->gso_max_size = lowerdev->gso_max_size;
3115 dev->gso_max_segs = lowerdev->gso_max_segs;
3117 needed_headroom = lowerdev->hard_header_len;
3119 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3121 if (max_mtu < ETH_MIN_MTU)
3122 max_mtu = ETH_MIN_MTU;
3124 if (!changelink && !conf->mtu)
3128 if (dev->mtu > max_mtu)
3131 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3132 needed_headroom += VXLAN6_HEADROOM;
3134 needed_headroom += VXLAN_HEADROOM;
3135 dev->needed_headroom = needed_headroom;
3137 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3140 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3141 struct vxlan_config *conf, bool changelink,
3142 struct netlink_ext_ack *extack)
3144 struct vxlan_dev *vxlan = netdev_priv(dev);
3145 struct net_device *lowerdev;
3148 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3152 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3157 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3158 struct vxlan_config *conf,
3159 struct netlink_ext_ack *extack)
3161 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3162 struct vxlan_dev *vxlan = netdev_priv(dev);
3165 err = vxlan_dev_configure(net, dev, conf, false, extack);
3169 dev->ethtool_ops = &vxlan_ethtool_ops;
3171 /* create an fdb entry for a valid default destination */
3172 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3173 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3174 &vxlan->default_dst.remote_ip,
3175 NUD_REACHABLE | NUD_PERMANENT,
3176 NLM_F_EXCL | NLM_F_CREATE,
3177 vxlan->cfg.dst_port,
3178 vxlan->default_dst.remote_vni,
3179 vxlan->default_dst.remote_vni,
3180 vxlan->default_dst.remote_ifindex,
3186 err = register_netdevice(dev);
3188 vxlan_fdb_delete_default(vxlan, vxlan->default_dst.remote_vni);
3192 list_add(&vxlan->next, &vn->vxlan_list);
3196 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3197 struct net_device *dev, struct vxlan_config *conf,
3200 struct vxlan_dev *vxlan = netdev_priv(dev);
3202 memset(conf, 0, sizeof(*conf));
3204 /* if changelink operation, start with old existing cfg */
3206 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3208 if (data[IFLA_VXLAN_ID]) {
3209 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3211 if (changelink && (vni != conf->vni))
3213 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3216 if (data[IFLA_VXLAN_GROUP]) {
3217 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
3220 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3221 conf->remote_ip.sa.sa_family = AF_INET;
3222 } else if (data[IFLA_VXLAN_GROUP6]) {
3223 if (!IS_ENABLED(CONFIG_IPV6))
3224 return -EPFNOSUPPORT;
3226 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
3229 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3230 conf->remote_ip.sa.sa_family = AF_INET6;
3233 if (data[IFLA_VXLAN_LOCAL]) {
3234 if (changelink && (conf->saddr.sa.sa_family != AF_INET))
3237 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3238 conf->saddr.sa.sa_family = AF_INET;
3239 } else if (data[IFLA_VXLAN_LOCAL6]) {
3240 if (!IS_ENABLED(CONFIG_IPV6))
3241 return -EPFNOSUPPORT;
3243 if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
3246 /* TODO: respect scope id */
3247 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3248 conf->saddr.sa.sa_family = AF_INET6;
3251 if (data[IFLA_VXLAN_LINK])
3252 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3254 if (data[IFLA_VXLAN_TOS])
3255 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3257 if (data[IFLA_VXLAN_TTL])
3258 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3260 if (data[IFLA_VXLAN_TTL_INHERIT]) {
3263 conf->flags |= VXLAN_F_TTL_INHERIT;
3266 if (data[IFLA_VXLAN_LABEL])
3267 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3268 IPV6_FLOWLABEL_MASK;
3270 if (data[IFLA_VXLAN_LEARNING]) {
3271 if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3272 conf->flags |= VXLAN_F_LEARN;
3274 conf->flags &= ~VXLAN_F_LEARN;
3275 } else if (!changelink) {
3276 /* default to learn on a new device */
3277 conf->flags |= VXLAN_F_LEARN;
3280 if (data[IFLA_VXLAN_AGEING]) {
3283 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3286 if (data[IFLA_VXLAN_PROXY]) {
3289 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3290 conf->flags |= VXLAN_F_PROXY;
3293 if (data[IFLA_VXLAN_RSC]) {
3296 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3297 conf->flags |= VXLAN_F_RSC;
3300 if (data[IFLA_VXLAN_L2MISS]) {
3303 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3304 conf->flags |= VXLAN_F_L2MISS;
3307 if (data[IFLA_VXLAN_L3MISS]) {
3310 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3311 conf->flags |= VXLAN_F_L3MISS;
3314 if (data[IFLA_VXLAN_LIMIT]) {
3317 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3320 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3323 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3324 conf->flags |= VXLAN_F_COLLECT_METADATA;
3327 if (data[IFLA_VXLAN_PORT_RANGE]) {
3329 const struct ifla_vxlan_port_range *p
3330 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3331 conf->port_min = ntohs(p->low);
3332 conf->port_max = ntohs(p->high);
3338 if (data[IFLA_VXLAN_PORT]) {
3341 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3344 if (data[IFLA_VXLAN_UDP_CSUM]) {
3347 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3348 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3351 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3354 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3355 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3358 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3361 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3362 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3365 if (data[IFLA_VXLAN_REMCSUM_TX]) {
3368 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3369 conf->flags |= VXLAN_F_REMCSUM_TX;
3372 if (data[IFLA_VXLAN_REMCSUM_RX]) {
3375 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3376 conf->flags |= VXLAN_F_REMCSUM_RX;
3379 if (data[IFLA_VXLAN_GBP]) {
3382 conf->flags |= VXLAN_F_GBP;
3385 if (data[IFLA_VXLAN_GPE]) {
3388 conf->flags |= VXLAN_F_GPE;
3391 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3394 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3400 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3406 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3407 struct nlattr *tb[], struct nlattr *data[],
3408 struct netlink_ext_ack *extack)
3410 struct vxlan_config conf;
3413 err = vxlan_nl2conf(tb, data, dev, &conf, false);
3417 return __vxlan_dev_create(src_net, dev, &conf, extack);
3420 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3421 struct nlattr *data[],
3422 struct netlink_ext_ack *extack)
3424 struct vxlan_dev *vxlan = netdev_priv(dev);
3425 struct vxlan_rdst *dst = &vxlan->default_dst;
3426 struct vxlan_rdst old_dst;
3427 struct vxlan_config conf;
3430 err = vxlan_nl2conf(tb, data,
3435 memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3437 err = vxlan_dev_configure(vxlan->net, dev, &conf, true, extack);
3441 /* handle default dst entry */
3442 if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3443 spin_lock_bh(&vxlan->hash_lock);
3444 if (!vxlan_addr_any(&old_dst.remote_ip))
3445 __vxlan_fdb_delete(vxlan, all_zeros_mac,
3447 vxlan->cfg.dst_port,
3450 old_dst.remote_ifindex, 0);
3452 if (!vxlan_addr_any(&dst->remote_ip)) {
3453 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3455 NUD_REACHABLE | NUD_PERMANENT,
3456 NLM_F_CREATE | NLM_F_APPEND,
3457 vxlan->cfg.dst_port,
3460 dst->remote_ifindex,
3463 spin_unlock_bh(&vxlan->hash_lock);
3467 spin_unlock_bh(&vxlan->hash_lock);
3473 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3475 struct vxlan_dev *vxlan = netdev_priv(dev);
3477 vxlan_flush(vxlan, true);
3479 gro_cells_destroy(&vxlan->gro_cells);
3480 list_del(&vxlan->next);
3481 unregister_netdevice_queue(dev, head);
3484 static size_t vxlan_get_size(const struct net_device *dev)
3487 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3488 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3489 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3490 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3491 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3492 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3493 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3494 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3495 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3496 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3497 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3498 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3499 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3500 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3501 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3502 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3503 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3504 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3505 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3506 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3507 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3508 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3512 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3514 const struct vxlan_dev *vxlan = netdev_priv(dev);
3515 const struct vxlan_rdst *dst = &vxlan->default_dst;
3516 struct ifla_vxlan_port_range ports = {
3517 .low = htons(vxlan->cfg.port_min),
3518 .high = htons(vxlan->cfg.port_max),
3521 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3522 goto nla_put_failure;
3524 if (!vxlan_addr_any(&dst->remote_ip)) {
3525 if (dst->remote_ip.sa.sa_family == AF_INET) {
3526 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3527 dst->remote_ip.sin.sin_addr.s_addr))
3528 goto nla_put_failure;
3529 #if IS_ENABLED(CONFIG_IPV6)
3531 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3532 &dst->remote_ip.sin6.sin6_addr))
3533 goto nla_put_failure;
3538 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3539 goto nla_put_failure;
3541 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3542 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3543 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3544 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3545 goto nla_put_failure;
3546 #if IS_ENABLED(CONFIG_IPV6)
3548 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3549 &vxlan->cfg.saddr.sin6.sin6_addr))
3550 goto nla_put_failure;
3555 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3556 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3557 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3558 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3559 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
3560 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3561 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
3562 nla_put_u8(skb, IFLA_VXLAN_RSC,
3563 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
3564 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3565 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
3566 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3567 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
3568 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3569 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
3570 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3571 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3572 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3573 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3574 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3575 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3576 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3577 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3578 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3579 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3580 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
3581 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3582 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
3583 goto nla_put_failure;
3585 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3586 goto nla_put_failure;
3588 if (vxlan->cfg.flags & VXLAN_F_GBP &&
3589 nla_put_flag(skb, IFLA_VXLAN_GBP))
3590 goto nla_put_failure;
3592 if (vxlan->cfg.flags & VXLAN_F_GPE &&
3593 nla_put_flag(skb, IFLA_VXLAN_GPE))
3594 goto nla_put_failure;
3596 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3597 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3598 goto nla_put_failure;
3606 static struct net *vxlan_get_link_net(const struct net_device *dev)
3608 struct vxlan_dev *vxlan = netdev_priv(dev);
3613 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3615 .maxtype = IFLA_VXLAN_MAX,
3616 .policy = vxlan_policy,
3617 .priv_size = sizeof(struct vxlan_dev),
3618 .setup = vxlan_setup,
3619 .validate = vxlan_validate,
3620 .newlink = vxlan_newlink,
3621 .changelink = vxlan_changelink,
3622 .dellink = vxlan_dellink,
3623 .get_size = vxlan_get_size,
3624 .fill_info = vxlan_fill_info,
3625 .get_link_net = vxlan_get_link_net,
3628 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3629 u8 name_assign_type,
3630 struct vxlan_config *conf)
3632 struct nlattr *tb[IFLA_MAX + 1];
3633 struct net_device *dev;
3636 memset(&tb, 0, sizeof(tb));
3638 dev = rtnl_create_link(net, name, name_assign_type,
3639 &vxlan_link_ops, tb);
3643 err = __vxlan_dev_create(net, dev, conf, NULL);
3646 return ERR_PTR(err);
3649 err = rtnl_configure_link(dev, NULL);
3651 LIST_HEAD(list_kill);
3653 vxlan_dellink(dev, &list_kill);
3654 unregister_netdevice_many(&list_kill);
3655 return ERR_PTR(err);
3660 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3662 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3663 struct net_device *dev)
3665 struct vxlan_dev *vxlan, *next;
3666 LIST_HEAD(list_kill);
3668 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3669 struct vxlan_rdst *dst = &vxlan->default_dst;
3671 /* In case we created vxlan device with carrier
3672 * and we loose the carrier due to module unload
3673 * we also need to remove vxlan device. In other
3674 * cases, it's not necessary and remote_ifindex
3675 * is 0 here, so no matches.
3677 if (dst->remote_ifindex == dev->ifindex)
3678 vxlan_dellink(vxlan->dev, &list_kill);
3681 unregister_netdevice_many(&list_kill);
3684 static int vxlan_netdevice_event(struct notifier_block *unused,
3685 unsigned long event, void *ptr)
3687 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3688 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3690 if (event == NETDEV_UNREGISTER) {
3691 vxlan_offload_rx_ports(dev, false);
3692 vxlan_handle_lowerdev_unregister(vn, dev);
3693 } else if (event == NETDEV_REGISTER) {
3694 vxlan_offload_rx_ports(dev, true);
3695 } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
3696 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
3697 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
3703 static struct notifier_block vxlan_notifier_block __read_mostly = {
3704 .notifier_call = vxlan_netdevice_event,
3707 static __net_init int vxlan_init_net(struct net *net)
3709 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3712 INIT_LIST_HEAD(&vn->vxlan_list);
3713 spin_lock_init(&vn->sock_lock);
3715 for (h = 0; h < PORT_HASH_SIZE; ++h)
3716 INIT_HLIST_HEAD(&vn->sock_list[h]);
3721 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
3723 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3724 struct vxlan_dev *vxlan, *next;
3725 struct net_device *dev, *aux;
3728 for_each_netdev_safe(net, dev, aux)
3729 if (dev->rtnl_link_ops == &vxlan_link_ops)
3730 unregister_netdevice_queue(dev, head);
3732 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3733 /* If vxlan->dev is in the same netns, it has already been added
3734 * to the list by the previous loop.
3736 if (!net_eq(dev_net(vxlan->dev), net)) {
3737 gro_cells_destroy(&vxlan->gro_cells);
3738 unregister_netdevice_queue(vxlan->dev, head);
3742 for (h = 0; h < PORT_HASH_SIZE; ++h)
3743 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
3746 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
3752 list_for_each_entry(net, net_list, exit_list)
3753 vxlan_destroy_tunnels(net, &list);
3755 unregister_netdevice_many(&list);
3759 static struct pernet_operations vxlan_net_ops = {
3760 .init = vxlan_init_net,
3761 .exit_batch = vxlan_exit_batch_net,
3762 .id = &vxlan_net_id,
3763 .size = sizeof(struct vxlan_net),
3766 static int __init vxlan_init_module(void)
3770 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3772 rc = register_pernet_subsys(&vxlan_net_ops);
3776 rc = register_netdevice_notifier(&vxlan_notifier_block);
3780 rc = rtnl_link_register(&vxlan_link_ops);
3786 unregister_netdevice_notifier(&vxlan_notifier_block);
3788 unregister_pernet_subsys(&vxlan_net_ops);
3792 late_initcall(vxlan_init_module);
3794 static void __exit vxlan_cleanup_module(void)
3796 rtnl_link_unregister(&vxlan_link_ops);
3797 unregister_netdevice_notifier(&vxlan_notifier_block);
3798 unregister_pernet_subsys(&vxlan_net_ops);
3799 /* rcu_barrier() is called by netns */
3801 module_exit(vxlan_cleanup_module);
3803 MODULE_LICENSE("GPL");
3804 MODULE_VERSION(VXLAN_VERSION);
3805 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3806 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3807 MODULE_ALIAS_RTNL_LINK("vxlan");