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 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan,
640 const u8 *mac, __u16 state,
641 __be32 src_vni, __u8 ndm_flags)
645 f = kmalloc(sizeof(*f), GFP_ATOMIC);
649 f->flags = ndm_flags;
650 f->updated = f->used = jiffies;
652 INIT_LIST_HEAD(&f->remotes);
653 memcpy(f->eth_addr, mac, ETH_ALEN);
658 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
659 const u8 *mac, union vxlan_addr *ip,
660 __u16 state, __be16 port, __be32 src_vni,
661 __be32 vni, __u32 ifindex, __u8 ndm_flags,
662 struct vxlan_fdb **fdb)
664 struct vxlan_rdst *rd = NULL;
668 if (vxlan->cfg.addrmax &&
669 vxlan->addrcnt >= vxlan->cfg.addrmax)
672 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
673 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
677 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
684 hlist_add_head_rcu(&f->hlist,
685 vxlan_fdb_head(vxlan, mac, src_vni));
692 /* Add new entry to forwarding table -- assumes lock held */
693 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
694 const u8 *mac, union vxlan_addr *ip,
695 __u16 state, __u16 flags,
696 __be16 port, __be32 src_vni, __be32 vni,
697 __u32 ifindex, __u8 ndm_flags)
699 struct vxlan_rdst *rd = NULL;
704 f = __vxlan_find_mac(vxlan, mac, src_vni);
706 if (flags & NLM_F_EXCL) {
707 netdev_dbg(vxlan->dev,
708 "lost race to create %pM\n", mac);
711 if (f->state != state) {
713 f->updated = jiffies;
716 if (f->flags != ndm_flags) {
717 f->flags = ndm_flags;
718 f->updated = jiffies;
721 if ((flags & NLM_F_REPLACE)) {
722 /* Only change unicasts */
723 if (!(is_multicast_ether_addr(f->eth_addr) ||
724 is_zero_ether_addr(f->eth_addr))) {
725 notify |= vxlan_fdb_replace(f, ip, port, vni,
730 if ((flags & NLM_F_APPEND) &&
731 (is_multicast_ether_addr(f->eth_addr) ||
732 is_zero_ether_addr(f->eth_addr))) {
733 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
740 if (!(flags & NLM_F_CREATE))
743 /* Disallow replace to add a multicast entry */
744 if ((flags & NLM_F_REPLACE) &&
745 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
748 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
749 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
750 vni, ifindex, ndm_flags, &f);
758 rd = first_remote_rtnl(f);
759 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
765 static void vxlan_fdb_free(struct rcu_head *head)
767 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
768 struct vxlan_rdst *rd, *nd;
770 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
771 dst_cache_destroy(&rd->dst_cache);
777 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
780 netdev_dbg(vxlan->dev,
781 "delete %pM\n", f->eth_addr);
785 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
787 hlist_del_rcu(&f->hlist);
788 call_rcu(&f->rcu, vxlan_fdb_free);
791 static void vxlan_dst_free(struct rcu_head *head)
793 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
795 dst_cache_destroy(&rd->dst_cache);
799 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
800 struct vxlan_rdst *rd)
802 list_del_rcu(&rd->list);
803 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
804 call_rcu(&rd->rcu, vxlan_dst_free);
807 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
808 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
809 __be32 *vni, u32 *ifindex)
811 struct net *net = dev_net(vxlan->dev);
815 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
819 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
820 if (remote->sa.sa_family == AF_INET) {
821 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
822 ip->sa.sa_family = AF_INET;
823 #if IS_ENABLED(CONFIG_IPV6)
825 ip->sin6.sin6_addr = in6addr_any;
826 ip->sa.sa_family = AF_INET6;
832 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
834 *port = nla_get_be16(tb[NDA_PORT]);
836 *port = vxlan->cfg.dst_port;
840 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
842 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
844 *vni = vxlan->default_dst.remote_vni;
847 if (tb[NDA_SRC_VNI]) {
848 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
850 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
852 *src_vni = vxlan->default_dst.remote_vni;
855 if (tb[NDA_IFINDEX]) {
856 struct net_device *tdev;
858 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
860 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
861 tdev = __dev_get_by_index(net, *ifindex);
863 return -EADDRNOTAVAIL;
871 /* Add static entry (via netlink) */
872 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
873 struct net_device *dev,
874 const unsigned char *addr, u16 vid, u16 flags)
876 struct vxlan_dev *vxlan = netdev_priv(dev);
877 /* struct net *net = dev_net(vxlan->dev); */
884 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
885 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
890 if (tb[NDA_DST] == NULL)
893 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
897 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
898 return -EAFNOSUPPORT;
900 spin_lock_bh(&vxlan->hash_lock);
901 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
902 port, src_vni, vni, ifindex, ndm->ndm_flags);
903 spin_unlock_bh(&vxlan->hash_lock);
908 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
909 const unsigned char *addr, union vxlan_addr ip,
910 __be16 port, __be32 src_vni, u32 vni, u32 ifindex,
914 struct vxlan_rdst *rd = NULL;
917 f = vxlan_find_mac(vxlan, addr, src_vni);
921 if (!vxlan_addr_any(&ip)) {
922 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
927 /* remove a destination if it's not the only one on the list,
928 * otherwise destroy the fdb entry
930 if (rd && !list_is_singular(&f->remotes)) {
931 vxlan_fdb_dst_destroy(vxlan, f, rd);
935 vxlan_fdb_destroy(vxlan, f, true);
941 /* Delete entry (via netlink) */
942 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
943 struct net_device *dev,
944 const unsigned char *addr, u16 vid)
946 struct vxlan_dev *vxlan = netdev_priv(dev);
953 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
957 spin_lock_bh(&vxlan->hash_lock);
958 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
960 spin_unlock_bh(&vxlan->hash_lock);
965 /* Dump forwarding table */
966 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
967 struct net_device *dev,
968 struct net_device *filter_dev, int *idx)
970 struct vxlan_dev *vxlan = netdev_priv(dev);
974 for (h = 0; h < FDB_HASH_SIZE; ++h) {
978 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
979 struct vxlan_rdst *rd;
981 list_for_each_entry_rcu(rd, &f->remotes, list) {
982 if (*idx < cb->args[2])
985 err = vxlan_fdb_info(skb, vxlan, f,
986 NETLINK_CB(cb->skb).portid,
1004 /* Watch incoming packets to learn mapping between Ethernet address
1005 * and Tunnel endpoint.
1006 * Return true if packet is bogus and should be dropped.
1008 static bool vxlan_snoop(struct net_device *dev,
1009 union vxlan_addr *src_ip, const u8 *src_mac,
1010 u32 src_ifindex, __be32 vni)
1012 struct vxlan_dev *vxlan = netdev_priv(dev);
1013 struct vxlan_fdb *f;
1016 #if IS_ENABLED(CONFIG_IPV6)
1017 if (src_ip->sa.sa_family == AF_INET6 &&
1018 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1019 ifindex = src_ifindex;
1022 f = vxlan_find_mac(vxlan, src_mac, vni);
1024 struct vxlan_rdst *rdst = first_remote_rcu(f);
1026 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1027 rdst->remote_ifindex == ifindex))
1030 /* Don't migrate static entries, drop packets */
1031 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1034 if (net_ratelimit())
1036 "%pM migrated from %pIS to %pIS\n",
1037 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1039 rdst->remote_ip = *src_ip;
1040 f->updated = jiffies;
1041 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1043 /* learned new entry */
1044 spin_lock(&vxlan->hash_lock);
1046 /* close off race between vxlan_flush and incoming packets */
1047 if (netif_running(dev))
1048 vxlan_fdb_update(vxlan, src_mac, src_ip,
1050 NLM_F_EXCL|NLM_F_CREATE,
1051 vxlan->cfg.dst_port,
1053 vxlan->default_dst.remote_vni,
1055 spin_unlock(&vxlan->hash_lock);
1061 /* See if multicast group is already in use by other ID */
1062 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1064 struct vxlan_dev *vxlan;
1065 struct vxlan_sock *sock4;
1066 #if IS_ENABLED(CONFIG_IPV6)
1067 struct vxlan_sock *sock6;
1069 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1071 sock4 = rtnl_dereference(dev->vn4_sock);
1073 /* The vxlan_sock is only used by dev, leaving group has
1074 * no effect on other vxlan devices.
1076 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1078 #if IS_ENABLED(CONFIG_IPV6)
1079 sock6 = rtnl_dereference(dev->vn6_sock);
1080 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1084 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1085 if (!netif_running(vxlan->dev) || vxlan == dev)
1088 if (family == AF_INET &&
1089 rtnl_dereference(vxlan->vn4_sock) != sock4)
1091 #if IS_ENABLED(CONFIG_IPV6)
1092 if (family == AF_INET6 &&
1093 rtnl_dereference(vxlan->vn6_sock) != sock6)
1097 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1098 &dev->default_dst.remote_ip))
1101 if (vxlan->default_dst.remote_ifindex !=
1102 dev->default_dst.remote_ifindex)
1111 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1113 struct vxlan_net *vn;
1117 if (!refcount_dec_and_test(&vs->refcnt))
1120 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1121 spin_lock(&vn->sock_lock);
1122 hlist_del_rcu(&vs->hlist);
1123 udp_tunnel_notify_del_rx_port(vs->sock,
1124 (vs->flags & VXLAN_F_GPE) ?
1125 UDP_TUNNEL_TYPE_VXLAN_GPE :
1126 UDP_TUNNEL_TYPE_VXLAN);
1127 spin_unlock(&vn->sock_lock);
1132 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1134 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1135 #if IS_ENABLED(CONFIG_IPV6)
1136 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1138 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1141 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1144 vxlan_vs_del_dev(vxlan);
1146 if (__vxlan_sock_release_prep(sock4)) {
1147 udp_tunnel_sock_release(sock4->sock);
1151 #if IS_ENABLED(CONFIG_IPV6)
1152 if (__vxlan_sock_release_prep(sock6)) {
1153 udp_tunnel_sock_release(sock6->sock);
1159 /* Update multicast group membership when first VNI on
1160 * multicast address is brought up
1162 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1165 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1166 int ifindex = vxlan->default_dst.remote_ifindex;
1169 if (ip->sa.sa_family == AF_INET) {
1170 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1171 struct ip_mreqn mreq = {
1172 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1173 .imr_ifindex = ifindex,
1176 sk = sock4->sock->sk;
1178 ret = ip_mc_join_group(sk, &mreq);
1180 #if IS_ENABLED(CONFIG_IPV6)
1182 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1184 sk = sock6->sock->sk;
1186 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1187 &ip->sin6.sin6_addr);
1195 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1196 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1199 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1200 int ifindex = vxlan->default_dst.remote_ifindex;
1203 if (ip->sa.sa_family == AF_INET) {
1204 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1205 struct ip_mreqn mreq = {
1206 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1207 .imr_ifindex = ifindex,
1210 sk = sock4->sock->sk;
1212 ret = ip_mc_leave_group(sk, &mreq);
1214 #if IS_ENABLED(CONFIG_IPV6)
1216 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1218 sk = sock6->sock->sk;
1220 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1221 &ip->sin6.sin6_addr);
1229 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1230 struct sk_buff *skb, u32 vxflags)
1232 size_t start, offset;
1234 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1237 start = vxlan_rco_start(unparsed->vx_vni);
1238 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1240 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1243 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1244 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1246 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1247 unparsed->vx_vni &= VXLAN_VNI_MASK;
1251 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1252 struct sk_buff *skb, u32 vxflags,
1253 struct vxlan_metadata *md)
1255 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1256 struct metadata_dst *tun_dst;
1258 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1261 md->gbp = ntohs(gbp->policy_id);
1263 tun_dst = (struct metadata_dst *)skb_dst(skb);
1265 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1266 tun_dst->u.tun_info.options_len = sizeof(*md);
1268 if (gbp->dont_learn)
1269 md->gbp |= VXLAN_GBP_DONT_LEARN;
1271 if (gbp->policy_applied)
1272 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1274 /* In flow-based mode, GBP is carried in dst_metadata */
1275 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1276 skb->mark = md->gbp;
1278 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1281 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1283 struct sk_buff *skb, u32 vxflags)
1285 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1287 /* Need to have Next Protocol set for interfaces in GPE mode. */
1288 if (!gpe->np_applied)
1290 /* "The initial version is 0. If a receiver does not support the
1291 * version indicated it MUST drop the packet.
1293 if (gpe->version != 0)
1295 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1296 * processing MUST occur." However, we don't implement OAM
1297 * processing, thus drop the packet.
1302 *protocol = tun_p_to_eth_p(gpe->next_protocol);
1306 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1310 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1311 struct vxlan_sock *vs,
1312 struct sk_buff *skb, __be32 vni)
1314 union vxlan_addr saddr;
1315 u32 ifindex = skb->dev->ifindex;
1317 skb_reset_mac_header(skb);
1318 skb->protocol = eth_type_trans(skb, vxlan->dev);
1319 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1321 /* Ignore packet loops (and multicast echo) */
1322 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1325 /* Get address from the outer IP header */
1326 if (vxlan_get_sk_family(vs) == AF_INET) {
1327 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1328 saddr.sa.sa_family = AF_INET;
1329 #if IS_ENABLED(CONFIG_IPV6)
1331 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1332 saddr.sa.sa_family = AF_INET6;
1336 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1337 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1343 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1344 struct sk_buff *skb)
1348 if (vxlan_get_sk_family(vs) == AF_INET)
1349 err = IP_ECN_decapsulate(oiph, skb);
1350 #if IS_ENABLED(CONFIG_IPV6)
1352 err = IP6_ECN_decapsulate(oiph, skb);
1355 if (unlikely(err) && log_ecn_error) {
1356 if (vxlan_get_sk_family(vs) == AF_INET)
1357 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1358 &((struct iphdr *)oiph)->saddr,
1359 ((struct iphdr *)oiph)->tos);
1361 net_info_ratelimited("non-ECT from %pI6\n",
1362 &((struct ipv6hdr *)oiph)->saddr);
1367 /* Callback from net/ipv4/udp.c to receive packets */
1368 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1370 struct pcpu_sw_netstats *stats;
1371 struct vxlan_dev *vxlan;
1372 struct vxlan_sock *vs;
1373 struct vxlanhdr unparsed;
1374 struct vxlan_metadata _md;
1375 struct vxlan_metadata *md = &_md;
1376 __be16 protocol = htons(ETH_P_TEB);
1377 bool raw_proto = false;
1381 /* Need UDP and VXLAN header to be present */
1382 if (!pskb_may_pull(skb, VXLAN_HLEN))
1385 unparsed = *vxlan_hdr(skb);
1386 /* VNI flag always required to be set */
1387 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1388 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1389 ntohl(vxlan_hdr(skb)->vx_flags),
1390 ntohl(vxlan_hdr(skb)->vx_vni));
1391 /* Return non vxlan pkt */
1394 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1395 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1397 vs = rcu_dereference_sk_user_data(sk);
1401 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1403 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1407 /* For backwards compatibility, only allow reserved fields to be
1408 * used by VXLAN extensions if explicitly requested.
1410 if (vs->flags & VXLAN_F_GPE) {
1411 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1416 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1417 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1420 if (vxlan_collect_metadata(vs)) {
1421 struct metadata_dst *tun_dst;
1423 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1424 key32_to_tunnel_id(vni), sizeof(*md));
1429 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1431 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1433 memset(md, 0, sizeof(*md));
1436 if (vs->flags & VXLAN_F_REMCSUM_RX)
1437 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1439 if (vs->flags & VXLAN_F_GBP)
1440 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1441 /* Note that GBP and GPE can never be active together. This is
1442 * ensured in vxlan_dev_configure.
1445 if (unparsed.vx_flags || unparsed.vx_vni) {
1446 /* If there are any unprocessed flags remaining treat
1447 * this as a malformed packet. This behavior diverges from
1448 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1449 * in reserved fields are to be ignored. The approach here
1450 * maintains compatibility with previous stack code, and also
1451 * is more robust and provides a little more security in
1452 * adding extensions to VXLAN.
1458 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1461 skb_reset_mac_header(skb);
1462 skb->dev = vxlan->dev;
1463 skb->pkt_type = PACKET_HOST;
1466 oiph = skb_network_header(skb);
1467 skb_reset_network_header(skb);
1469 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1470 ++vxlan->dev->stats.rx_frame_errors;
1471 ++vxlan->dev->stats.rx_errors;
1477 if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1479 atomic_long_inc(&vxlan->dev->rx_dropped);
1483 stats = this_cpu_ptr(vxlan->dev->tstats);
1484 u64_stats_update_begin(&stats->syncp);
1485 stats->rx_packets++;
1486 stats->rx_bytes += skb->len;
1487 u64_stats_update_end(&stats->syncp);
1489 gro_cells_receive(&vxlan->gro_cells, skb);
1496 /* Consume bad packet */
1501 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1503 struct vxlan_dev *vxlan = netdev_priv(dev);
1504 struct arphdr *parp;
1507 struct neighbour *n;
1509 if (dev->flags & IFF_NOARP)
1512 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1513 dev->stats.tx_dropped++;
1516 parp = arp_hdr(skb);
1518 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1519 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1520 parp->ar_pro != htons(ETH_P_IP) ||
1521 parp->ar_op != htons(ARPOP_REQUEST) ||
1522 parp->ar_hln != dev->addr_len ||
1525 arpptr = (u8 *)parp + sizeof(struct arphdr);
1527 arpptr += dev->addr_len; /* sha */
1528 memcpy(&sip, arpptr, sizeof(sip));
1529 arpptr += sizeof(sip);
1530 arpptr += dev->addr_len; /* tha */
1531 memcpy(&tip, arpptr, sizeof(tip));
1533 if (ipv4_is_loopback(tip) ||
1534 ipv4_is_multicast(tip))
1537 n = neigh_lookup(&arp_tbl, &tip, dev);
1540 struct vxlan_fdb *f;
1541 struct sk_buff *reply;
1543 if (!(n->nud_state & NUD_CONNECTED)) {
1548 f = vxlan_find_mac(vxlan, n->ha, vni);
1549 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1550 /* bridge-local neighbor */
1555 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1563 skb_reset_mac_header(reply);
1564 __skb_pull(reply, skb_network_offset(reply));
1565 reply->ip_summed = CHECKSUM_UNNECESSARY;
1566 reply->pkt_type = PACKET_HOST;
1568 if (netif_rx_ni(reply) == NET_RX_DROP)
1569 dev->stats.rx_dropped++;
1570 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1571 union vxlan_addr ipa = {
1572 .sin.sin_addr.s_addr = tip,
1573 .sin.sin_family = AF_INET,
1576 vxlan_ip_miss(dev, &ipa);
1580 return NETDEV_TX_OK;
1583 #if IS_ENABLED(CONFIG_IPV6)
1584 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1585 struct neighbour *n, bool isrouter)
1587 struct net_device *dev = request->dev;
1588 struct sk_buff *reply;
1589 struct nd_msg *ns, *na;
1590 struct ipv6hdr *pip6;
1592 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1596 if (dev == NULL || !pskb_may_pull(request, request->len))
1599 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1600 sizeof(*na) + na_olen + dev->needed_tailroom;
1601 reply = alloc_skb(len, GFP_ATOMIC);
1605 reply->protocol = htons(ETH_P_IPV6);
1607 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1608 skb_push(reply, sizeof(struct ethhdr));
1609 skb_reset_mac_header(reply);
1611 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1613 daddr = eth_hdr(request)->h_source;
1614 ns_olen = request->len - skb_network_offset(request) -
1615 sizeof(struct ipv6hdr) - sizeof(*ns);
1616 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1617 if (!ns->opt[i + 1]) {
1621 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1622 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1627 /* Ethernet header */
1628 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1629 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1630 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1631 reply->protocol = htons(ETH_P_IPV6);
1633 skb_pull(reply, sizeof(struct ethhdr));
1634 skb_reset_network_header(reply);
1635 skb_put(reply, sizeof(struct ipv6hdr));
1639 pip6 = ipv6_hdr(reply);
1640 memset(pip6, 0, sizeof(struct ipv6hdr));
1642 pip6->priority = ipv6_hdr(request)->priority;
1643 pip6->nexthdr = IPPROTO_ICMPV6;
1644 pip6->hop_limit = 255;
1645 pip6->daddr = ipv6_hdr(request)->saddr;
1646 pip6->saddr = *(struct in6_addr *)n->primary_key;
1648 skb_pull(reply, sizeof(struct ipv6hdr));
1649 skb_reset_transport_header(reply);
1651 /* Neighbor Advertisement */
1652 na = skb_put_zero(reply, sizeof(*na) + na_olen);
1653 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1654 na->icmph.icmp6_router = isrouter;
1655 na->icmph.icmp6_override = 1;
1656 na->icmph.icmp6_solicited = 1;
1657 na->target = ns->target;
1658 ether_addr_copy(&na->opt[2], n->ha);
1659 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1660 na->opt[1] = na_olen >> 3;
1662 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1663 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1664 csum_partial(na, sizeof(*na)+na_olen, 0));
1666 pip6->payload_len = htons(sizeof(*na)+na_olen);
1668 skb_push(reply, sizeof(struct ipv6hdr));
1670 reply->ip_summed = CHECKSUM_UNNECESSARY;
1675 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1677 struct vxlan_dev *vxlan = netdev_priv(dev);
1678 const struct in6_addr *daddr;
1679 const struct ipv6hdr *iphdr;
1680 struct inet6_dev *in6_dev;
1681 struct neighbour *n;
1685 in6_dev = __in6_dev_get(dev);
1689 iphdr = ipv6_hdr(skb);
1690 daddr = &iphdr->daddr;
1691 msg = (struct nd_msg *)(iphdr + 1);
1693 if (ipv6_addr_loopback(daddr) ||
1694 ipv6_addr_is_multicast(&msg->target))
1697 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1700 struct vxlan_fdb *f;
1701 struct sk_buff *reply;
1703 if (!(n->nud_state & NUD_CONNECTED)) {
1708 f = vxlan_find_mac(vxlan, n->ha, vni);
1709 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1710 /* bridge-local neighbor */
1715 reply = vxlan_na_create(skb, n,
1716 !!(f ? f->flags & NTF_ROUTER : 0));
1723 if (netif_rx_ni(reply) == NET_RX_DROP)
1724 dev->stats.rx_dropped++;
1726 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1727 union vxlan_addr ipa = {
1728 .sin6.sin6_addr = msg->target,
1729 .sin6.sin6_family = AF_INET6,
1732 vxlan_ip_miss(dev, &ipa);
1738 return NETDEV_TX_OK;
1742 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1744 struct vxlan_dev *vxlan = netdev_priv(dev);
1745 struct neighbour *n;
1747 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1751 switch (ntohs(eth_hdr(skb)->h_proto)) {
1756 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1759 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1760 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1761 union vxlan_addr ipa = {
1762 .sin.sin_addr.s_addr = pip->daddr,
1763 .sin.sin_family = AF_INET,
1766 vxlan_ip_miss(dev, &ipa);
1772 #if IS_ENABLED(CONFIG_IPV6)
1775 struct ipv6hdr *pip6;
1777 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1779 pip6 = ipv6_hdr(skb);
1780 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1781 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1782 union vxlan_addr ipa = {
1783 .sin6.sin6_addr = pip6->daddr,
1784 .sin6.sin6_family = AF_INET6,
1787 vxlan_ip_miss(dev, &ipa);
1801 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1803 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1805 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1814 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1815 struct vxlan_metadata *md)
1817 struct vxlanhdr_gbp *gbp;
1822 gbp = (struct vxlanhdr_gbp *)vxh;
1823 vxh->vx_flags |= VXLAN_HF_GBP;
1825 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1826 gbp->dont_learn = 1;
1828 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1829 gbp->policy_applied = 1;
1831 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1834 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1837 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1839 gpe->np_applied = 1;
1840 gpe->next_protocol = tun_p_from_eth_p(protocol);
1841 if (!gpe->next_protocol)
1842 return -EPFNOSUPPORT;
1846 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1847 int iphdr_len, __be32 vni,
1848 struct vxlan_metadata *md, u32 vxflags,
1851 struct vxlanhdr *vxh;
1854 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1855 __be16 inner_protocol = htons(ETH_P_TEB);
1857 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1858 skb->ip_summed == CHECKSUM_PARTIAL) {
1859 int csum_start = skb_checksum_start_offset(skb);
1861 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1862 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1863 (skb->csum_offset == offsetof(struct udphdr, check) ||
1864 skb->csum_offset == offsetof(struct tcphdr, check)))
1865 type |= SKB_GSO_TUNNEL_REMCSUM;
1868 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1869 + VXLAN_HLEN + iphdr_len;
1871 /* Need space for new headers (invalidates iph ptr) */
1872 err = skb_cow_head(skb, min_headroom);
1876 err = iptunnel_handle_offloads(skb, type);
1880 vxh = __skb_push(skb, sizeof(*vxh));
1881 vxh->vx_flags = VXLAN_HF_VNI;
1882 vxh->vx_vni = vxlan_vni_field(vni);
1884 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1887 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1888 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1889 vxh->vx_flags |= VXLAN_HF_RCO;
1891 if (!skb_is_gso(skb)) {
1892 skb->ip_summed = CHECKSUM_NONE;
1893 skb->encapsulation = 0;
1897 if (vxflags & VXLAN_F_GBP)
1898 vxlan_build_gbp_hdr(vxh, vxflags, md);
1899 if (vxflags & VXLAN_F_GPE) {
1900 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1903 inner_protocol = skb->protocol;
1906 skb_set_inner_protocol(skb, inner_protocol);
1910 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1911 struct vxlan_sock *sock4,
1912 struct sk_buff *skb, int oif, u8 tos,
1913 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1914 struct dst_cache *dst_cache,
1915 const struct ip_tunnel_info *info)
1917 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1918 struct rtable *rt = NULL;
1922 return ERR_PTR(-EIO);
1927 rt = dst_cache_get_ip4(dst_cache, saddr);
1932 memset(&fl4, 0, sizeof(fl4));
1933 fl4.flowi4_oif = oif;
1934 fl4.flowi4_tos = RT_TOS(tos);
1935 fl4.flowi4_mark = skb->mark;
1936 fl4.flowi4_proto = IPPROTO_UDP;
1939 fl4.fl4_dport = dport;
1940 fl4.fl4_sport = sport;
1942 rt = ip_route_output_key(vxlan->net, &fl4);
1943 if (likely(!IS_ERR(rt))) {
1944 if (rt->dst.dev == dev) {
1945 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1947 return ERR_PTR(-ELOOP);
1952 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1954 netdev_dbg(dev, "no route to %pI4\n", &daddr);
1955 return ERR_PTR(-ENETUNREACH);
1960 #if IS_ENABLED(CONFIG_IPV6)
1961 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1962 struct net_device *dev,
1963 struct vxlan_sock *sock6,
1964 struct sk_buff *skb, int oif, u8 tos,
1966 const struct in6_addr *daddr,
1967 struct in6_addr *saddr,
1968 __be16 dport, __be16 sport,
1969 struct dst_cache *dst_cache,
1970 const struct ip_tunnel_info *info)
1972 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1973 struct dst_entry *ndst;
1977 return ERR_PTR(-EIO);
1982 ndst = dst_cache_get_ip6(dst_cache, saddr);
1987 memset(&fl6, 0, sizeof(fl6));
1988 fl6.flowi6_oif = oif;
1991 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1992 fl6.flowi6_mark = skb->mark;
1993 fl6.flowi6_proto = IPPROTO_UDP;
1994 fl6.fl6_dport = dport;
1995 fl6.fl6_sport = sport;
1997 ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
1999 if (unlikely(IS_ERR(ndst))) {
2000 netdev_dbg(dev, "no route to %pI6\n", daddr);
2001 return ERR_PTR(-ENETUNREACH);
2004 if (unlikely(ndst->dev == dev)) {
2005 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2007 return ERR_PTR(-ELOOP);
2012 dst_cache_set_ip6(dst_cache, ndst, saddr);
2017 /* Bypass encapsulation if the destination is local */
2018 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2019 struct vxlan_dev *dst_vxlan, __be32 vni)
2021 struct pcpu_sw_netstats *tx_stats, *rx_stats;
2022 union vxlan_addr loopback;
2023 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2024 struct net_device *dev;
2027 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2028 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2029 skb->pkt_type = PACKET_HOST;
2030 skb->encapsulation = 0;
2031 skb->dev = dst_vxlan->dev;
2032 __skb_pull(skb, skb_network_offset(skb));
2034 if (remote_ip->sa.sa_family == AF_INET) {
2035 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2036 loopback.sa.sa_family = AF_INET;
2037 #if IS_ENABLED(CONFIG_IPV6)
2039 loopback.sin6.sin6_addr = in6addr_loopback;
2040 loopback.sa.sa_family = AF_INET6;
2046 if (unlikely(!(dev->flags & IFF_UP))) {
2051 if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2052 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2054 u64_stats_update_begin(&tx_stats->syncp);
2055 tx_stats->tx_packets++;
2056 tx_stats->tx_bytes += len;
2057 u64_stats_update_end(&tx_stats->syncp);
2059 if (netif_rx(skb) == NET_RX_SUCCESS) {
2060 u64_stats_update_begin(&rx_stats->syncp);
2061 rx_stats->rx_packets++;
2062 rx_stats->rx_bytes += len;
2063 u64_stats_update_end(&rx_stats->syncp);
2066 dev->stats.rx_dropped++;
2071 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2072 struct vxlan_dev *vxlan,
2073 union vxlan_addr *daddr,
2074 __be16 dst_port, int dst_ifindex, __be32 vni,
2075 struct dst_entry *dst,
2078 #if IS_ENABLED(CONFIG_IPV6)
2079 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2080 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2081 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2083 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2085 /* Bypass encapsulation if the destination is local */
2086 if (rt_flags & RTCF_LOCAL &&
2087 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2088 struct vxlan_dev *dst_vxlan;
2091 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2092 daddr->sa.sa_family, dst_port,
2095 dev->stats.tx_errors++;
2100 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2107 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2108 __be32 default_vni, struct vxlan_rdst *rdst,
2111 struct dst_cache *dst_cache;
2112 struct ip_tunnel_info *info;
2113 struct vxlan_dev *vxlan = netdev_priv(dev);
2114 const struct iphdr *old_iph = ip_hdr(skb);
2115 union vxlan_addr *dst;
2116 union vxlan_addr remote_ip, local_ip;
2117 struct vxlan_metadata _md;
2118 struct vxlan_metadata *md = &_md;
2119 __be16 src_port = 0, dst_port;
2120 struct dst_entry *ndst = NULL;
2125 u32 flags = vxlan->cfg.flags;
2126 bool udp_sum = false;
2127 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2129 info = skb_tunnel_info(skb);
2132 dst = &rdst->remote_ip;
2133 if (vxlan_addr_any(dst)) {
2135 /* short-circuited back to local bridge */
2136 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2142 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2143 vni = (rdst->remote_vni) ? : default_vni;
2144 ifindex = rdst->remote_ifindex;
2145 local_ip = vxlan->cfg.saddr;
2146 dst_cache = &rdst->dst_cache;
2147 md->gbp = skb->mark;
2148 ttl = vxlan->cfg.ttl;
2149 if (!ttl && vxlan_addr_multicast(dst))
2152 tos = vxlan->cfg.tos;
2154 tos = ip_tunnel_get_dsfield(old_iph, skb);
2156 if (dst->sa.sa_family == AF_INET)
2157 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2159 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2160 label = vxlan->cfg.label;
2163 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2167 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2168 if (remote_ip.sa.sa_family == AF_INET) {
2169 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2170 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2172 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2173 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2176 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2177 vni = tunnel_id_to_key32(info->key.tun_id);
2179 dst_cache = &info->dst_cache;
2180 if (info->options_len) {
2181 if (info->options_len < sizeof(*md))
2183 md = ip_tunnel_info_opts(info);
2185 ttl = info->key.ttl;
2186 tos = info->key.tos;
2187 label = info->key.label;
2188 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2190 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2191 vxlan->cfg.port_max, true);
2194 if (dst->sa.sa_family == AF_INET) {
2195 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2199 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2200 dst->sin.sin_addr.s_addr,
2201 &local_ip.sin.sin_addr.s_addr,
2209 /* Bypass encapsulation if the destination is local */
2211 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2212 dst_port, ifindex, vni,
2213 &rt->dst, rt->rt_flags);
2216 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2222 int mtu = dst_mtu(ndst) - VXLAN_HEADROOM;
2224 skb_dst_update_pmtu(skb, mtu);
2227 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2228 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2229 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2230 vni, md, flags, udp_sum);
2234 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2235 dst->sin.sin_addr.s_addr, tos, ttl, df,
2236 src_port, dst_port, xnet, !udp_sum);
2237 #if IS_ENABLED(CONFIG_IPV6)
2239 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2241 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2242 label, &dst->sin6.sin6_addr,
2243 &local_ip.sin6.sin6_addr,
2247 err = PTR_ERR(ndst);
2253 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2255 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2256 dst_port, ifindex, vni,
2263 int mtu = dst_mtu(ndst) - VXLAN6_HEADROOM;
2265 skb_dst_update_pmtu(skb, mtu);
2268 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2269 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2270 skb_scrub_packet(skb, xnet);
2271 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2272 vni, md, flags, udp_sum);
2276 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2277 &local_ip.sin6.sin6_addr,
2278 &dst->sin6.sin6_addr, tos, ttl,
2279 label, src_port, dst_port, !udp_sum);
2287 dev->stats.tx_dropped++;
2294 dev->stats.collisions++;
2295 else if (err == -ENETUNREACH)
2296 dev->stats.tx_carrier_errors++;
2298 dev->stats.tx_errors++;
2302 /* Transmit local packets over Vxlan
2304 * Outer IP header inherits ECN and DF from inner header.
2305 * Outer UDP destination is the VXLAN assigned port.
2306 * source port is based on hash of flow
2308 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2310 struct vxlan_dev *vxlan = netdev_priv(dev);
2311 struct vxlan_rdst *rdst, *fdst = NULL;
2312 const struct ip_tunnel_info *info;
2313 bool did_rsc = false;
2314 struct vxlan_fdb *f;
2318 info = skb_tunnel_info(skb);
2320 skb_reset_mac_header(skb);
2322 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2323 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2324 info->mode & IP_TUNNEL_INFO_TX) {
2325 vni = tunnel_id_to_key32(info->key.tun_id);
2327 if (info && info->mode & IP_TUNNEL_INFO_TX)
2328 vxlan_xmit_one(skb, dev, vni, NULL, false);
2331 return NETDEV_TX_OK;
2335 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2337 if (ntohs(eth->h_proto) == ETH_P_ARP)
2338 return arp_reduce(dev, skb, vni);
2339 #if IS_ENABLED(CONFIG_IPV6)
2340 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2341 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2342 sizeof(struct nd_msg)) &&
2343 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2344 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2346 if (m->icmph.icmp6_code == 0 &&
2347 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2348 return neigh_reduce(dev, skb, vni);
2354 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2357 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2358 (ntohs(eth->h_proto) == ETH_P_IP ||
2359 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2360 did_rsc = route_shortcircuit(dev, skb);
2362 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2366 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2368 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2369 !is_multicast_ether_addr(eth->h_dest))
2370 vxlan_fdb_miss(vxlan, eth->h_dest);
2372 dev->stats.tx_dropped++;
2374 return NETDEV_TX_OK;
2378 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2379 struct sk_buff *skb1;
2385 skb1 = skb_clone(skb, GFP_ATOMIC);
2387 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2391 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2394 return NETDEV_TX_OK;
2397 /* Walk the forwarding table and purge stale entries */
2398 static void vxlan_cleanup(unsigned long arg)
2400 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2401 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2404 if (!netif_running(vxlan->dev))
2407 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2408 struct hlist_node *p, *n;
2410 spin_lock_bh(&vxlan->hash_lock);
2411 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2413 = container_of(p, struct vxlan_fdb, hlist);
2414 unsigned long timeout;
2416 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2419 if (f->flags & NTF_EXT_LEARNED)
2422 timeout = f->used + vxlan->cfg.age_interval * HZ;
2423 if (time_before_eq(timeout, jiffies)) {
2424 netdev_dbg(vxlan->dev,
2425 "garbage collect %pM\n",
2427 f->state = NUD_STALE;
2428 vxlan_fdb_destroy(vxlan, f, true);
2429 } else if (time_before(timeout, next_timer))
2430 next_timer = timeout;
2432 spin_unlock_bh(&vxlan->hash_lock);
2435 mod_timer(&vxlan->age_timer, next_timer);
2438 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2440 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2442 spin_lock(&vn->sock_lock);
2443 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2444 #if IS_ENABLED(CONFIG_IPV6)
2445 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2447 spin_unlock(&vn->sock_lock);
2450 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2451 struct vxlan_dev_node *node)
2453 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2454 __be32 vni = vxlan->default_dst.remote_vni;
2456 node->vxlan = vxlan;
2457 spin_lock(&vn->sock_lock);
2458 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2459 spin_unlock(&vn->sock_lock);
2462 /* Setup stats when device is created */
2463 static int vxlan_init(struct net_device *dev)
2465 struct vxlan_dev *vxlan = netdev_priv(dev);
2468 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2472 err = gro_cells_init(&vxlan->gro_cells, dev);
2474 free_percpu(dev->tstats);
2481 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2483 struct vxlan_fdb *f;
2485 spin_lock_bh(&vxlan->hash_lock);
2486 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2488 vxlan_fdb_destroy(vxlan, f, true);
2489 spin_unlock_bh(&vxlan->hash_lock);
2492 static void vxlan_uninit(struct net_device *dev)
2494 struct vxlan_dev *vxlan = netdev_priv(dev);
2496 gro_cells_destroy(&vxlan->gro_cells);
2498 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2500 free_percpu(dev->tstats);
2503 /* Start ageing timer and join group when device is brought up */
2504 static int vxlan_open(struct net_device *dev)
2506 struct vxlan_dev *vxlan = netdev_priv(dev);
2509 ret = vxlan_sock_add(vxlan);
2513 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2514 ret = vxlan_igmp_join(vxlan);
2515 if (ret == -EADDRINUSE)
2518 vxlan_sock_release(vxlan);
2523 if (vxlan->cfg.age_interval)
2524 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2529 /* Purge the forwarding table */
2530 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2534 spin_lock_bh(&vxlan->hash_lock);
2535 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2536 struct hlist_node *p, *n;
2537 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2539 = container_of(p, struct vxlan_fdb, hlist);
2540 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2542 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2543 if (!is_zero_ether_addr(f->eth_addr))
2544 vxlan_fdb_destroy(vxlan, f, true);
2547 spin_unlock_bh(&vxlan->hash_lock);
2550 /* Cleanup timer and forwarding table on shutdown */
2551 static int vxlan_stop(struct net_device *dev)
2553 struct vxlan_dev *vxlan = netdev_priv(dev);
2554 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2557 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2558 !vxlan_group_used(vn, vxlan))
2559 ret = vxlan_igmp_leave(vxlan);
2561 del_timer_sync(&vxlan->age_timer);
2563 vxlan_flush(vxlan, false);
2564 vxlan_sock_release(vxlan);
2569 /* Stub, nothing needs to be done. */
2570 static void vxlan_set_multicast_list(struct net_device *dev)
2574 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2576 struct vxlan_dev *vxlan = netdev_priv(dev);
2577 struct vxlan_rdst *dst = &vxlan->default_dst;
2578 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2579 dst->remote_ifindex);
2580 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2582 /* This check is different than dev->max_mtu, because it looks at
2583 * the lowerdev->mtu, rather than the static dev->max_mtu
2586 int max_mtu = lowerdev->mtu -
2587 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2588 if (new_mtu > max_mtu)
2596 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2598 struct vxlan_dev *vxlan = netdev_priv(dev);
2599 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2600 __be16 sport, dport;
2602 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2603 vxlan->cfg.port_max, true);
2604 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2606 if (ip_tunnel_info_af(info) == AF_INET) {
2607 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2610 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2611 info->key.u.ipv4.dst,
2612 &info->key.u.ipv4.src, dport, sport,
2613 &info->dst_cache, info);
2618 #if IS_ENABLED(CONFIG_IPV6)
2619 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2620 struct dst_entry *ndst;
2622 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2623 info->key.label, &info->key.u.ipv6.dst,
2624 &info->key.u.ipv6.src, dport, sport,
2625 &info->dst_cache, info);
2627 return PTR_ERR(ndst);
2629 #else /* !CONFIG_IPV6 */
2630 return -EPFNOSUPPORT;
2633 info->key.tp_src = sport;
2634 info->key.tp_dst = dport;
2638 static const struct net_device_ops vxlan_netdev_ether_ops = {
2639 .ndo_init = vxlan_init,
2640 .ndo_uninit = vxlan_uninit,
2641 .ndo_open = vxlan_open,
2642 .ndo_stop = vxlan_stop,
2643 .ndo_start_xmit = vxlan_xmit,
2644 .ndo_get_stats64 = ip_tunnel_get_stats64,
2645 .ndo_set_rx_mode = vxlan_set_multicast_list,
2646 .ndo_change_mtu = vxlan_change_mtu,
2647 .ndo_validate_addr = eth_validate_addr,
2648 .ndo_set_mac_address = eth_mac_addr,
2649 .ndo_fdb_add = vxlan_fdb_add,
2650 .ndo_fdb_del = vxlan_fdb_delete,
2651 .ndo_fdb_dump = vxlan_fdb_dump,
2652 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2655 static const struct net_device_ops vxlan_netdev_raw_ops = {
2656 .ndo_init = vxlan_init,
2657 .ndo_uninit = vxlan_uninit,
2658 .ndo_open = vxlan_open,
2659 .ndo_stop = vxlan_stop,
2660 .ndo_start_xmit = vxlan_xmit,
2661 .ndo_get_stats64 = ip_tunnel_get_stats64,
2662 .ndo_change_mtu = vxlan_change_mtu,
2663 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2666 /* Info for udev, that this is a virtual tunnel endpoint */
2667 static struct device_type vxlan_type = {
2671 /* Calls the ndo_udp_tunnel_add of the caller in order to
2672 * supply the listening VXLAN udp ports. Callers are expected
2673 * to implement the ndo_udp_tunnel_add.
2675 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2677 struct vxlan_sock *vs;
2678 struct net *net = dev_net(dev);
2679 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2682 spin_lock(&vn->sock_lock);
2683 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2684 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2685 unsigned short type;
2687 if (vs->flags & VXLAN_F_GPE)
2688 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
2690 type = UDP_TUNNEL_TYPE_VXLAN;
2693 udp_tunnel_push_rx_port(dev, vs->sock, type);
2695 udp_tunnel_drop_rx_port(dev, vs->sock, type);
2698 spin_unlock(&vn->sock_lock);
2701 /* Initialize the device structure. */
2702 static void vxlan_setup(struct net_device *dev)
2704 struct vxlan_dev *vxlan = netdev_priv(dev);
2707 eth_hw_addr_random(dev);
2710 dev->needs_free_netdev = true;
2711 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2713 dev->features |= NETIF_F_LLTX;
2714 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2715 dev->features |= NETIF_F_RXCSUM;
2716 dev->features |= NETIF_F_GSO_SOFTWARE;
2718 dev->vlan_features = dev->features;
2719 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2720 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2721 netif_keep_dst(dev);
2722 dev->priv_flags |= IFF_NO_QUEUE;
2724 /* MTU range: 68 - 65535 */
2725 dev->min_mtu = ETH_MIN_MTU;
2726 dev->max_mtu = ETH_MAX_MTU;
2728 INIT_LIST_HEAD(&vxlan->next);
2729 spin_lock_init(&vxlan->hash_lock);
2731 init_timer_deferrable(&vxlan->age_timer);
2732 vxlan->age_timer.function = vxlan_cleanup;
2733 vxlan->age_timer.data = (unsigned long) vxlan;
2737 for (h = 0; h < FDB_HASH_SIZE; ++h)
2738 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2741 static void vxlan_ether_setup(struct net_device *dev)
2743 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2744 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2745 dev->netdev_ops = &vxlan_netdev_ether_ops;
2748 static void vxlan_raw_setup(struct net_device *dev)
2750 dev->header_ops = NULL;
2751 dev->type = ARPHRD_NONE;
2752 dev->hard_header_len = 0;
2754 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2755 dev->netdev_ops = &vxlan_netdev_raw_ops;
2758 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2759 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2760 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2761 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2762 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2763 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2764 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2765 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2766 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2767 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2768 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2769 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2770 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2771 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2772 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2773 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2774 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2775 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2776 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2777 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2778 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2779 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2780 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2781 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2782 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2783 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2784 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2785 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2788 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
2789 struct netlink_ext_ack *extack)
2791 if (tb[IFLA_ADDRESS]) {
2792 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2793 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2794 "Provided link layer address is not Ethernet");
2798 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2799 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2800 "Provided Ethernet address is not unicast");
2801 return -EADDRNOTAVAIL;
2806 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
2808 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
2809 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
2810 "MTU must be between 68 and 65535");
2816 NL_SET_ERR_MSG(extack,
2817 "Required attributes not provided to perform the operation");
2821 if (data[IFLA_VXLAN_ID]) {
2822 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2824 if (id >= VXLAN_N_VID) {
2825 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
2826 "VXLAN ID must be lower than 16777216");
2831 if (data[IFLA_VXLAN_PORT_RANGE]) {
2832 const struct ifla_vxlan_port_range *p
2833 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2835 if (ntohs(p->high) < ntohs(p->low)) {
2836 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
2837 "Invalid source port range");
2845 static void vxlan_get_drvinfo(struct net_device *netdev,
2846 struct ethtool_drvinfo *drvinfo)
2848 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2849 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2852 static const struct ethtool_ops vxlan_ethtool_ops = {
2853 .get_drvinfo = vxlan_get_drvinfo,
2854 .get_link = ethtool_op_get_link,
2857 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2858 __be16 port, u32 flags)
2860 struct socket *sock;
2861 struct udp_port_cfg udp_conf;
2864 memset(&udp_conf, 0, sizeof(udp_conf));
2867 udp_conf.family = AF_INET6;
2868 udp_conf.use_udp6_rx_checksums =
2869 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2870 udp_conf.ipv6_v6only = 1;
2872 udp_conf.family = AF_INET;
2875 udp_conf.local_udp_port = port;
2877 /* Open UDP socket */
2878 err = udp_sock_create(net, &udp_conf, &sock);
2880 return ERR_PTR(err);
2885 /* Create new listen socket if needed */
2886 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2887 __be16 port, u32 flags)
2889 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2890 struct vxlan_sock *vs;
2891 struct socket *sock;
2893 struct udp_tunnel_sock_cfg tunnel_cfg;
2895 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2897 return ERR_PTR(-ENOMEM);
2899 for (h = 0; h < VNI_HASH_SIZE; ++h)
2900 INIT_HLIST_HEAD(&vs->vni_list[h]);
2902 sock = vxlan_create_sock(net, ipv6, port, flags);
2905 return ERR_CAST(sock);
2909 refcount_set(&vs->refcnt, 1);
2910 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2912 spin_lock(&vn->sock_lock);
2913 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2914 udp_tunnel_notify_add_rx_port(sock,
2915 (vs->flags & VXLAN_F_GPE) ?
2916 UDP_TUNNEL_TYPE_VXLAN_GPE :
2917 UDP_TUNNEL_TYPE_VXLAN);
2918 spin_unlock(&vn->sock_lock);
2920 /* Mark socket as an encapsulation socket. */
2921 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2922 tunnel_cfg.sk_user_data = vs;
2923 tunnel_cfg.encap_type = 1;
2924 tunnel_cfg.encap_rcv = vxlan_rcv;
2925 tunnel_cfg.encap_destroy = NULL;
2926 tunnel_cfg.gro_receive = vxlan_gro_receive;
2927 tunnel_cfg.gro_complete = vxlan_gro_complete;
2929 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2934 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2936 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2937 struct vxlan_sock *vs = NULL;
2938 struct vxlan_dev_node *node;
2940 if (!vxlan->cfg.no_share) {
2941 spin_lock(&vn->sock_lock);
2942 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2943 vxlan->cfg.dst_port, vxlan->cfg.flags);
2944 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
2945 spin_unlock(&vn->sock_lock);
2948 spin_unlock(&vn->sock_lock);
2951 vs = vxlan_socket_create(vxlan->net, ipv6,
2952 vxlan->cfg.dst_port, vxlan->cfg.flags);
2955 #if IS_ENABLED(CONFIG_IPV6)
2957 rcu_assign_pointer(vxlan->vn6_sock, vs);
2958 node = &vxlan->hlist6;
2962 rcu_assign_pointer(vxlan->vn4_sock, vs);
2963 node = &vxlan->hlist4;
2965 vxlan_vs_add_dev(vs, vxlan, node);
2969 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2971 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
2972 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
2973 bool ipv4 = !ipv6 || metadata;
2976 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2977 #if IS_ENABLED(CONFIG_IPV6)
2978 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2980 ret = __vxlan_sock_add(vxlan, true);
2981 if (ret < 0 && ret != -EAFNOSUPPORT)
2986 ret = __vxlan_sock_add(vxlan, false);
2988 vxlan_sock_release(vxlan);
2992 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
2993 struct net_device **lower,
2994 struct vxlan_dev *old,
2995 struct netlink_ext_ack *extack)
2997 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2998 struct vxlan_dev *tmp;
2999 bool use_ipv6 = false;
3001 if (conf->flags & VXLAN_F_GPE) {
3002 /* For now, allow GPE only together with
3003 * COLLECT_METADATA. This can be relaxed later; in such
3004 * case, the other side of the PtP link will have to be
3007 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3008 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3009 NL_SET_ERR_MSG(extack,
3010 "VXLAN GPE does not support this combination of attributes");
3015 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3016 /* Unless IPv6 is explicitly requested, assume IPv4 */
3017 conf->remote_ip.sa.sa_family = AF_INET;
3018 conf->saddr.sa.sa_family = AF_INET;
3019 } else if (!conf->remote_ip.sa.sa_family) {
3020 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3021 } else if (!conf->saddr.sa.sa_family) {
3022 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3025 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3026 NL_SET_ERR_MSG(extack,
3027 "Local and remote address must be from the same family");
3031 if (vxlan_addr_multicast(&conf->saddr)) {
3032 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3036 if (conf->saddr.sa.sa_family == AF_INET6) {
3037 if (!IS_ENABLED(CONFIG_IPV6)) {
3038 NL_SET_ERR_MSG(extack,
3039 "IPv6 support not enabled in the kernel");
3040 return -EPFNOSUPPORT;
3043 conf->flags |= VXLAN_F_IPV6;
3045 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3047 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3049 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3051 if (local_type & IPV6_ADDR_LINKLOCAL) {
3052 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3053 (remote_type != IPV6_ADDR_ANY)) {
3054 NL_SET_ERR_MSG(extack,
3055 "Invalid combination of local and remote address scopes");
3059 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3062 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3063 NL_SET_ERR_MSG(extack,
3064 "Invalid combination of local and remote address scopes");
3068 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3073 if (conf->label && !use_ipv6) {
3074 NL_SET_ERR_MSG(extack,
3075 "Label attribute only applies to IPv6 VXLAN devices");
3079 if (conf->remote_ifindex) {
3080 struct net_device *lowerdev;
3082 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3084 NL_SET_ERR_MSG(extack,
3085 "Invalid local interface, device not found");
3089 #if IS_ENABLED(CONFIG_IPV6)
3091 struct inet6_dev *idev = __in6_dev_get(lowerdev);
3092 if (idev && idev->cnf.disable_ipv6) {
3093 NL_SET_ERR_MSG(extack,
3094 "IPv6 support disabled by administrator");
3102 if (vxlan_addr_multicast(&conf->remote_ip)) {
3103 NL_SET_ERR_MSG(extack,
3104 "Local interface required for multicast remote destination");
3109 #if IS_ENABLED(CONFIG_IPV6)
3110 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3111 NL_SET_ERR_MSG(extack,
3112 "Local interface required for link-local local/remote addresses");
3120 if (!conf->dst_port) {
3121 if (conf->flags & VXLAN_F_GPE)
3122 conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3124 conf->dst_port = htons(vxlan_port);
3127 if (!conf->age_interval)
3128 conf->age_interval = FDB_AGE_DEFAULT;
3130 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3134 if (tmp->cfg.vni != conf->vni)
3136 if (tmp->cfg.dst_port != conf->dst_port)
3138 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3139 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3142 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3143 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3146 NL_SET_ERR_MSG(extack,
3147 "A VXLAN device with the specified VNI already exists");
3154 static void vxlan_config_apply(struct net_device *dev,
3155 struct vxlan_config *conf,
3156 struct net_device *lowerdev,
3157 struct net *src_net,
3160 struct vxlan_dev *vxlan = netdev_priv(dev);
3161 struct vxlan_rdst *dst = &vxlan->default_dst;
3162 unsigned short needed_headroom = ETH_HLEN;
3163 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3164 int max_mtu = ETH_MAX_MTU;
3167 if (conf->flags & VXLAN_F_GPE)
3168 vxlan_raw_setup(dev);
3170 vxlan_ether_setup(dev);
3173 dev->mtu = conf->mtu;
3175 vxlan->net = src_net;
3178 dst->remote_vni = conf->vni;
3180 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3183 dst->remote_ifindex = conf->remote_ifindex;
3185 dev->gso_max_size = lowerdev->gso_max_size;
3186 dev->gso_max_segs = lowerdev->gso_max_segs;
3188 needed_headroom = lowerdev->hard_header_len;
3189 needed_headroom += lowerdev->needed_headroom;
3191 dev->needed_tailroom = lowerdev->needed_tailroom;
3193 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3195 if (max_mtu < ETH_MIN_MTU)
3196 max_mtu = ETH_MIN_MTU;
3198 if (!changelink && !conf->mtu)
3202 if (dev->mtu > max_mtu)
3205 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3206 needed_headroom += VXLAN6_HEADROOM;
3208 needed_headroom += VXLAN_HEADROOM;
3209 dev->needed_headroom = needed_headroom;
3211 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3214 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3215 struct vxlan_config *conf, bool changelink,
3216 struct netlink_ext_ack *extack)
3218 struct vxlan_dev *vxlan = netdev_priv(dev);
3219 struct net_device *lowerdev;
3222 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3226 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3231 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3232 struct vxlan_config *conf,
3233 struct netlink_ext_ack *extack)
3235 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3236 struct vxlan_dev *vxlan = netdev_priv(dev);
3237 struct vxlan_fdb *f = NULL;
3238 bool unregister = false;
3241 err = vxlan_dev_configure(net, dev, conf, false, extack);
3245 dev->ethtool_ops = &vxlan_ethtool_ops;
3247 /* create an fdb entry for a valid default destination */
3248 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3249 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3250 &vxlan->default_dst.remote_ip,
3251 NUD_REACHABLE | NUD_PERMANENT,
3252 vxlan->cfg.dst_port,
3253 vxlan->default_dst.remote_vni,
3254 vxlan->default_dst.remote_vni,
3255 vxlan->default_dst.remote_ifindex,
3261 err = register_netdevice(dev);
3266 err = rtnl_configure_link(dev, NULL);
3270 /* notify default fdb entry */
3272 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH);
3274 list_add(&vxlan->next, &vn->vxlan_list);
3278 /* unregister_netdevice() destroys the default FDB entry with deletion
3279 * notification. But the addition notification was not sent yet, so
3280 * destroy the entry by hand here.
3283 vxlan_fdb_destroy(vxlan, f, false);
3285 unregister_netdevice(dev);
3289 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3290 struct net_device *dev, struct vxlan_config *conf,
3293 struct vxlan_dev *vxlan = netdev_priv(dev);
3295 memset(conf, 0, sizeof(*conf));
3297 /* if changelink operation, start with old existing cfg */
3299 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3301 if (data[IFLA_VXLAN_ID]) {
3302 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3304 if (changelink && (vni != conf->vni))
3306 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3309 if (data[IFLA_VXLAN_GROUP]) {
3310 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
3313 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3314 conf->remote_ip.sa.sa_family = AF_INET;
3315 } else if (data[IFLA_VXLAN_GROUP6]) {
3316 if (!IS_ENABLED(CONFIG_IPV6))
3317 return -EPFNOSUPPORT;
3319 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
3322 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3323 conf->remote_ip.sa.sa_family = AF_INET6;
3326 if (data[IFLA_VXLAN_LOCAL]) {
3327 if (changelink && (conf->saddr.sa.sa_family != AF_INET))
3330 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3331 conf->saddr.sa.sa_family = AF_INET;
3332 } else if (data[IFLA_VXLAN_LOCAL6]) {
3333 if (!IS_ENABLED(CONFIG_IPV6))
3334 return -EPFNOSUPPORT;
3336 if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
3339 /* TODO: respect scope id */
3340 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3341 conf->saddr.sa.sa_family = AF_INET6;
3344 if (data[IFLA_VXLAN_LINK])
3345 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3347 if (data[IFLA_VXLAN_TOS])
3348 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3350 if (data[IFLA_VXLAN_TTL])
3351 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3353 if (data[IFLA_VXLAN_LABEL])
3354 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3355 IPV6_FLOWLABEL_MASK;
3357 if (data[IFLA_VXLAN_LEARNING]) {
3358 if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3359 conf->flags |= VXLAN_F_LEARN;
3361 conf->flags &= ~VXLAN_F_LEARN;
3362 } else if (!changelink) {
3363 /* default to learn on a new device */
3364 conf->flags |= VXLAN_F_LEARN;
3367 if (data[IFLA_VXLAN_AGEING]) {
3370 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3373 if (data[IFLA_VXLAN_PROXY]) {
3376 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3377 conf->flags |= VXLAN_F_PROXY;
3380 if (data[IFLA_VXLAN_RSC]) {
3383 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3384 conf->flags |= VXLAN_F_RSC;
3387 if (data[IFLA_VXLAN_L2MISS]) {
3390 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3391 conf->flags |= VXLAN_F_L2MISS;
3394 if (data[IFLA_VXLAN_L3MISS]) {
3397 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3398 conf->flags |= VXLAN_F_L3MISS;
3401 if (data[IFLA_VXLAN_LIMIT]) {
3404 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3407 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3410 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3411 conf->flags |= VXLAN_F_COLLECT_METADATA;
3414 if (data[IFLA_VXLAN_PORT_RANGE]) {
3416 const struct ifla_vxlan_port_range *p
3417 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3418 conf->port_min = ntohs(p->low);
3419 conf->port_max = ntohs(p->high);
3425 if (data[IFLA_VXLAN_PORT]) {
3428 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3431 if (data[IFLA_VXLAN_UDP_CSUM]) {
3434 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3435 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3438 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3441 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3442 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3445 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3448 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3449 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3452 if (data[IFLA_VXLAN_REMCSUM_TX]) {
3455 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3456 conf->flags |= VXLAN_F_REMCSUM_TX;
3459 if (data[IFLA_VXLAN_REMCSUM_RX]) {
3462 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3463 conf->flags |= VXLAN_F_REMCSUM_RX;
3466 if (data[IFLA_VXLAN_GBP]) {
3469 conf->flags |= VXLAN_F_GBP;
3472 if (data[IFLA_VXLAN_GPE]) {
3475 conf->flags |= VXLAN_F_GPE;
3478 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3481 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3487 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3493 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3494 struct nlattr *tb[], struct nlattr *data[],
3495 struct netlink_ext_ack *extack)
3497 struct vxlan_config conf;
3500 err = vxlan_nl2conf(tb, data, dev, &conf, false);
3504 return __vxlan_dev_create(src_net, dev, &conf, extack);
3507 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3508 struct nlattr *data[],
3509 struct netlink_ext_ack *extack)
3511 struct vxlan_dev *vxlan = netdev_priv(dev);
3512 struct vxlan_rdst *dst = &vxlan->default_dst;
3513 struct vxlan_rdst old_dst;
3514 struct vxlan_config conf;
3517 err = vxlan_nl2conf(tb, data,
3522 memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3524 err = vxlan_dev_configure(vxlan->net, dev, &conf, true, extack);
3528 /* handle default dst entry */
3529 if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3530 spin_lock_bh(&vxlan->hash_lock);
3531 if (!vxlan_addr_any(&old_dst.remote_ip))
3532 __vxlan_fdb_delete(vxlan, all_zeros_mac,
3534 vxlan->cfg.dst_port,
3537 old_dst.remote_ifindex, 0);
3539 if (!vxlan_addr_any(&dst->remote_ip)) {
3540 err = vxlan_fdb_update(vxlan, all_zeros_mac,
3542 NUD_REACHABLE | NUD_PERMANENT,
3543 NLM_F_APPEND | NLM_F_CREATE,
3544 vxlan->cfg.dst_port,
3547 dst->remote_ifindex,
3550 spin_unlock_bh(&vxlan->hash_lock);
3554 spin_unlock_bh(&vxlan->hash_lock);
3560 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3562 struct vxlan_dev *vxlan = netdev_priv(dev);
3564 vxlan_flush(vxlan, true);
3566 list_del(&vxlan->next);
3567 unregister_netdevice_queue(dev, head);
3570 static size_t vxlan_get_size(const struct net_device *dev)
3573 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3574 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3575 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3576 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3577 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3578 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3579 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3580 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3581 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3582 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3583 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3584 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3585 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3586 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3587 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3588 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3589 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3590 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3591 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3592 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3593 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3594 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3598 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3600 const struct vxlan_dev *vxlan = netdev_priv(dev);
3601 const struct vxlan_rdst *dst = &vxlan->default_dst;
3602 struct ifla_vxlan_port_range ports = {
3603 .low = htons(vxlan->cfg.port_min),
3604 .high = htons(vxlan->cfg.port_max),
3607 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3608 goto nla_put_failure;
3610 if (!vxlan_addr_any(&dst->remote_ip)) {
3611 if (dst->remote_ip.sa.sa_family == AF_INET) {
3612 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3613 dst->remote_ip.sin.sin_addr.s_addr))
3614 goto nla_put_failure;
3615 #if IS_ENABLED(CONFIG_IPV6)
3617 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3618 &dst->remote_ip.sin6.sin6_addr))
3619 goto nla_put_failure;
3624 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3625 goto nla_put_failure;
3627 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3628 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3629 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3630 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3631 goto nla_put_failure;
3632 #if IS_ENABLED(CONFIG_IPV6)
3634 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3635 &vxlan->cfg.saddr.sin6.sin6_addr))
3636 goto nla_put_failure;
3641 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3642 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3643 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3644 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3645 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
3646 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3647 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
3648 nla_put_u8(skb, IFLA_VXLAN_RSC,
3649 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
3650 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3651 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
3652 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3653 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
3654 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3655 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
3656 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3657 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3658 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3659 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3660 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3661 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3662 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3663 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3664 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3665 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3666 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
3667 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3668 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
3669 goto nla_put_failure;
3671 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3672 goto nla_put_failure;
3674 if (vxlan->cfg.flags & VXLAN_F_GBP &&
3675 nla_put_flag(skb, IFLA_VXLAN_GBP))
3676 goto nla_put_failure;
3678 if (vxlan->cfg.flags & VXLAN_F_GPE &&
3679 nla_put_flag(skb, IFLA_VXLAN_GPE))
3680 goto nla_put_failure;
3682 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3683 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3684 goto nla_put_failure;
3692 static struct net *vxlan_get_link_net(const struct net_device *dev)
3694 struct vxlan_dev *vxlan = netdev_priv(dev);
3699 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3701 .maxtype = IFLA_VXLAN_MAX,
3702 .policy = vxlan_policy,
3703 .priv_size = sizeof(struct vxlan_dev),
3704 .setup = vxlan_setup,
3705 .validate = vxlan_validate,
3706 .newlink = vxlan_newlink,
3707 .changelink = vxlan_changelink,
3708 .dellink = vxlan_dellink,
3709 .get_size = vxlan_get_size,
3710 .fill_info = vxlan_fill_info,
3711 .get_link_net = vxlan_get_link_net,
3714 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3715 u8 name_assign_type,
3716 struct vxlan_config *conf)
3718 struct nlattr *tb[IFLA_MAX + 1];
3719 struct net_device *dev;
3722 memset(&tb, 0, sizeof(tb));
3724 dev = rtnl_create_link(net, name, name_assign_type,
3725 &vxlan_link_ops, tb);
3729 err = __vxlan_dev_create(net, dev, conf, NULL);
3732 return ERR_PTR(err);
3735 err = rtnl_configure_link(dev, NULL);
3737 LIST_HEAD(list_kill);
3739 vxlan_dellink(dev, &list_kill);
3740 unregister_netdevice_many(&list_kill);
3741 return ERR_PTR(err);
3746 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3748 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3749 struct net_device *dev)
3751 struct vxlan_dev *vxlan, *next;
3752 LIST_HEAD(list_kill);
3754 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3755 struct vxlan_rdst *dst = &vxlan->default_dst;
3757 /* In case we created vxlan device with carrier
3758 * and we loose the carrier due to module unload
3759 * we also need to remove vxlan device. In other
3760 * cases, it's not necessary and remote_ifindex
3761 * is 0 here, so no matches.
3763 if (dst->remote_ifindex == dev->ifindex)
3764 vxlan_dellink(vxlan->dev, &list_kill);
3767 unregister_netdevice_many(&list_kill);
3770 static int vxlan_netdevice_event(struct notifier_block *unused,
3771 unsigned long event, void *ptr)
3773 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3774 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3776 if (event == NETDEV_UNREGISTER) {
3777 vxlan_offload_rx_ports(dev, false);
3778 vxlan_handle_lowerdev_unregister(vn, dev);
3779 } else if (event == NETDEV_REGISTER) {
3780 vxlan_offload_rx_ports(dev, true);
3781 } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
3782 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
3783 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
3789 static struct notifier_block vxlan_notifier_block __read_mostly = {
3790 .notifier_call = vxlan_netdevice_event,
3793 static __net_init int vxlan_init_net(struct net *net)
3795 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3798 INIT_LIST_HEAD(&vn->vxlan_list);
3799 spin_lock_init(&vn->sock_lock);
3801 for (h = 0; h < PORT_HASH_SIZE; ++h)
3802 INIT_HLIST_HEAD(&vn->sock_list[h]);
3807 static void __net_exit vxlan_exit_net(struct net *net)
3809 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3810 struct vxlan_dev *vxlan, *next;
3811 struct net_device *dev, *aux;
3815 for_each_netdev_safe(net, dev, aux)
3816 if (dev->rtnl_link_ops == &vxlan_link_ops)
3817 unregister_netdevice_queue(dev, &list);
3819 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3820 /* If vxlan->dev is in the same netns, it has already been added
3821 * to the list by the previous loop.
3823 if (!net_eq(dev_net(vxlan->dev), net))
3824 unregister_netdevice_queue(vxlan->dev, &list);
3827 unregister_netdevice_many(&list);
3831 static struct pernet_operations vxlan_net_ops = {
3832 .init = vxlan_init_net,
3833 .exit = vxlan_exit_net,
3834 .id = &vxlan_net_id,
3835 .size = sizeof(struct vxlan_net),
3838 static int __init vxlan_init_module(void)
3842 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3844 rc = register_pernet_subsys(&vxlan_net_ops);
3848 rc = register_netdevice_notifier(&vxlan_notifier_block);
3852 rc = rtnl_link_register(&vxlan_link_ops);
3858 unregister_netdevice_notifier(&vxlan_notifier_block);
3860 unregister_pernet_subsys(&vxlan_net_ops);
3864 late_initcall(vxlan_init_module);
3866 static void __exit vxlan_cleanup_module(void)
3868 rtnl_link_unregister(&vxlan_link_ops);
3869 unregister_netdevice_notifier(&vxlan_notifier_block);
3870 unregister_pernet_subsys(&vxlan_net_ops);
3871 /* rcu_barrier() is called by netns */
3873 module_exit(vxlan_cleanup_module);
3875 MODULE_LICENSE("GPL");
3876 MODULE_VERSION(VXLAN_VERSION);
3877 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3878 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3879 MODULE_ALIAS_RTNL_LINK("vxlan");