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/types.h>
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/rculist.h>
20 #include <linux/netdevice.h>
23 #include <linux/udp.h>
24 #include <linux/igmp.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/hash.h>
29 #include <linux/ethtool.h>
31 #include <net/ndisc.h>
33 #include <net/ip_tunnels.h>
36 #include <net/rtnetlink.h>
37 #include <net/route.h>
38 #include <net/dsfield.h>
39 #include <net/inet_ecn.h>
40 #include <net/net_namespace.h>
41 #include <net/netns/generic.h>
42 #include <net/vxlan.h>
43 #if IS_ENABLED(CONFIG_IPV6)
45 #include <net/addrconf.h>
46 #include <net/ip6_tunnel.h>
47 #include <net/ip6_checksum.h>
50 #define VXLAN_VERSION "0.1"
52 #define PORT_HASH_BITS 8
53 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
54 #define VNI_HASH_BITS 10
55 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
56 #define FDB_HASH_BITS 8
57 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
58 #define FDB_AGE_DEFAULT 300 /* 5 min */
59 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
61 #define VXLAN_N_VID (1u << 24)
62 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
63 #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
65 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
67 /* VXLAN protocol header */
73 /* UDP port for VXLAN traffic.
74 * The IANA assigned port is 4789, but the Linux default is 8472
75 * for compatibility with early adopters.
77 static unsigned short vxlan_port __read_mostly = 8472;
78 module_param_named(udp_port, vxlan_port, ushort, 0444);
79 MODULE_PARM_DESC(udp_port, "Destination UDP port");
81 static bool log_ecn_error = true;
82 module_param(log_ecn_error, bool, 0644);
83 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
85 static int vxlan_net_id;
87 static const u8 all_zeros_mac[ETH_ALEN];
89 /* per-network namespace private data for this module */
91 struct list_head vxlan_list;
92 struct hlist_head sock_list[PORT_HASH_SIZE];
97 struct sockaddr_in sin;
98 struct sockaddr_in6 sin6;
103 union vxlan_addr remote_ip;
107 struct list_head list;
111 /* Forwarding table entry */
113 struct hlist_node hlist; /* linked list of entries */
115 unsigned long updated; /* jiffies */
117 struct list_head remotes;
118 u16 state; /* see ndm_state */
119 u8 flags; /* see ndm_flags */
120 u8 eth_addr[ETH_ALEN];
123 /* Pseudo network device */
125 struct hlist_node hlist; /* vni hash table */
126 struct list_head next; /* vxlan's per namespace list */
127 struct vxlan_sock *vn_sock; /* listening socket */
128 struct net_device *dev;
129 struct vxlan_rdst default_dst; /* default destination */
130 union vxlan_addr saddr; /* source address */
132 __u16 port_min; /* source port range */
134 __u8 tos; /* TOS override */
136 u32 flags; /* VXLAN_F_* below */
138 struct work_struct sock_work;
139 struct work_struct igmp_join;
140 struct work_struct igmp_leave;
142 unsigned long age_interval;
143 struct timer_list age_timer;
144 spinlock_t hash_lock;
145 unsigned int addrcnt;
146 unsigned int addrmax;
148 struct hlist_head fdb_head[FDB_HASH_SIZE];
151 #define VXLAN_F_LEARN 0x01
152 #define VXLAN_F_PROXY 0x02
153 #define VXLAN_F_RSC 0x04
154 #define VXLAN_F_L2MISS 0x08
155 #define VXLAN_F_L3MISS 0x10
156 #define VXLAN_F_IPV6 0x20 /* internal flag */
158 /* salt for hash table */
159 static u32 vxlan_salt __read_mostly;
160 static struct workqueue_struct *vxlan_wq;
162 static void vxlan_sock_work(struct work_struct *work);
164 #if IS_ENABLED(CONFIG_IPV6)
166 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
168 if (a->sa.sa_family != b->sa.sa_family)
170 if (a->sa.sa_family == AF_INET6)
171 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
173 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
176 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
178 if (ipa->sa.sa_family == AF_INET6)
179 return ipv6_addr_any(&ipa->sin6.sin6_addr);
181 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
184 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
186 if (ipa->sa.sa_family == AF_INET6)
187 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
189 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
192 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
194 if (nla_len(nla) >= sizeof(struct in6_addr)) {
195 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
196 ip->sa.sa_family = AF_INET6;
198 } else if (nla_len(nla) >= sizeof(__be32)) {
199 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
200 ip->sa.sa_family = AF_INET;
203 return -EAFNOSUPPORT;
207 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
208 const union vxlan_addr *ip)
210 if (ip->sa.sa_family == AF_INET6)
211 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
213 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
216 #else /* !CONFIG_IPV6 */
219 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
221 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
224 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
226 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
229 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
231 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
234 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
236 if (nla_len(nla) >= sizeof(struct in6_addr)) {
237 return -EAFNOSUPPORT;
238 } else if (nla_len(nla) >= sizeof(__be32)) {
239 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
240 ip->sa.sa_family = AF_INET;
243 return -EAFNOSUPPORT;
247 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
248 const union vxlan_addr *ip)
250 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
254 /* Virtual Network hash table head */
255 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
257 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
260 /* Socket hash table head */
261 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
263 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
265 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
268 /* First remote destination for a forwarding entry.
269 * Guaranteed to be non-NULL because remotes are never deleted.
271 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
273 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
276 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
278 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
281 /* Find VXLAN socket based on network namespace and UDP port */
282 static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
284 struct vxlan_sock *vs;
286 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
287 if (inet_sk(vs->sock->sk)->inet_sport == port)
293 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
295 struct vxlan_dev *vxlan;
297 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
298 if (vxlan->default_dst.remote_vni == id)
305 /* Look up VNI in a per net namespace table */
306 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
308 struct vxlan_sock *vs;
310 vs = vxlan_find_sock(net, port);
314 return vxlan_vs_find_vni(vs, id);
317 /* Fill in neighbour message in skbuff. */
318 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
319 const struct vxlan_fdb *fdb,
320 u32 portid, u32 seq, int type, unsigned int flags,
321 const struct vxlan_rdst *rdst)
323 unsigned long now = jiffies;
324 struct nda_cacheinfo ci;
325 struct nlmsghdr *nlh;
327 bool send_ip, send_eth;
329 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
333 ndm = nlmsg_data(nlh);
334 memset(ndm, 0, sizeof(*ndm));
336 send_eth = send_ip = true;
338 if (type == RTM_GETNEIGH) {
339 ndm->ndm_family = AF_INET;
340 send_ip = !vxlan_addr_any(&rdst->remote_ip);
341 send_eth = !is_zero_ether_addr(fdb->eth_addr);
343 ndm->ndm_family = AF_BRIDGE;
344 ndm->ndm_state = fdb->state;
345 ndm->ndm_ifindex = vxlan->dev->ifindex;
346 ndm->ndm_flags = fdb->flags;
347 ndm->ndm_type = NDA_DST;
349 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
350 goto nla_put_failure;
352 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
353 goto nla_put_failure;
355 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
356 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
357 goto nla_put_failure;
358 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
359 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
360 goto nla_put_failure;
361 if (rdst->remote_ifindex &&
362 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
363 goto nla_put_failure;
365 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
366 ci.ndm_confirmed = 0;
367 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
370 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
371 goto nla_put_failure;
373 return nlmsg_end(skb, nlh);
376 nlmsg_cancel(skb, nlh);
380 static inline size_t vxlan_nlmsg_size(void)
382 return NLMSG_ALIGN(sizeof(struct ndmsg))
383 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
384 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
385 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
386 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
387 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
388 + nla_total_size(sizeof(struct nda_cacheinfo));
391 static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
392 struct vxlan_fdb *fdb, int type)
394 struct net *net = dev_net(vxlan->dev);
398 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
402 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0,
403 first_remote_rtnl(fdb));
405 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
406 WARN_ON(err == -EMSGSIZE);
411 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
415 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
418 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
420 struct vxlan_dev *vxlan = netdev_priv(dev);
421 struct vxlan_fdb f = {
424 struct vxlan_rdst remote = {
425 .remote_ip = *ipa, /* goes to NDA_DST */
426 .remote_vni = VXLAN_N_VID,
429 INIT_LIST_HEAD(&f.remotes);
430 list_add_rcu(&remote.list, &f.remotes);
432 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
435 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
437 struct vxlan_fdb f = {
441 INIT_LIST_HEAD(&f.remotes);
442 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
444 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
447 /* Hash Ethernet address */
448 static u32 eth_hash(const unsigned char *addr)
450 u64 value = get_unaligned((u64 *)addr);
452 /* only want 6 bytes */
458 return hash_64(value, FDB_HASH_BITS);
461 /* Hash chain to use given mac address */
462 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
465 return &vxlan->fdb_head[eth_hash(mac)];
468 /* Look up Ethernet address in forwarding table */
469 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
473 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
476 hlist_for_each_entry_rcu(f, head, hlist) {
477 if (ether_addr_equal(mac, f->eth_addr))
484 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
489 f = __vxlan_find_mac(vxlan, mac);
496 /* caller should hold vxlan->hash_lock */
497 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
498 union vxlan_addr *ip, __be16 port,
499 __u32 vni, __u32 ifindex)
501 struct vxlan_rdst *rd;
503 list_for_each_entry(rd, &f->remotes, list) {
504 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
505 rd->remote_port == port &&
506 rd->remote_vni == vni &&
507 rd->remote_ifindex == ifindex)
514 /* Replace destination of unicast mac */
515 static int vxlan_fdb_replace(struct vxlan_fdb *f,
516 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
518 struct vxlan_rdst *rd;
520 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
524 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
528 rd->remote_port = port;
529 rd->remote_vni = vni;
530 rd->remote_ifindex = ifindex;
534 /* Add/update destinations for multicast */
535 static int vxlan_fdb_append(struct vxlan_fdb *f,
536 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
538 struct vxlan_rdst *rd;
540 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
544 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
548 rd->remote_port = port;
549 rd->remote_vni = vni;
550 rd->remote_ifindex = ifindex;
552 list_add_tail_rcu(&rd->list, &f->remotes);
557 /* Notify netdevs that UDP port started listening */
558 static void vxlan_notify_add_rx_port(struct sock *sk)
560 struct net_device *dev;
561 struct net *net = sock_net(sk);
562 sa_family_t sa_family = sk->sk_family;
563 __be16 port = inet_sk(sk)->inet_sport;
566 for_each_netdev_rcu(net, dev) {
567 if (dev->netdev_ops->ndo_add_vxlan_port)
568 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
574 /* Notify netdevs that UDP port is no more listening */
575 static void vxlan_notify_del_rx_port(struct sock *sk)
577 struct net_device *dev;
578 struct net *net = sock_net(sk);
579 sa_family_t sa_family = sk->sk_family;
580 __be16 port = inet_sk(sk)->inet_sport;
583 for_each_netdev_rcu(net, dev) {
584 if (dev->netdev_ops->ndo_del_vxlan_port)
585 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
591 /* Add new entry to forwarding table -- assumes lock held */
592 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
593 const u8 *mac, union vxlan_addr *ip,
594 __u16 state, __u16 flags,
595 __be16 port, __u32 vni, __u32 ifindex,
601 f = __vxlan_find_mac(vxlan, mac);
603 if (flags & NLM_F_EXCL) {
604 netdev_dbg(vxlan->dev,
605 "lost race to create %pM\n", mac);
608 if (f->state != state) {
610 f->updated = jiffies;
613 if (f->flags != ndm_flags) {
614 f->flags = ndm_flags;
615 f->updated = jiffies;
618 if ((flags & NLM_F_REPLACE)) {
619 /* Only change unicasts */
620 if (!(is_multicast_ether_addr(f->eth_addr) ||
621 is_zero_ether_addr(f->eth_addr))) {
622 int rc = vxlan_fdb_replace(f, ip, port, vni,
631 if ((flags & NLM_F_APPEND) &&
632 (is_multicast_ether_addr(f->eth_addr) ||
633 is_zero_ether_addr(f->eth_addr))) {
634 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex);
641 if (!(flags & NLM_F_CREATE))
644 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
647 /* Disallow replace to add a multicast entry */
648 if ((flags & NLM_F_REPLACE) &&
649 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
652 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
653 f = kmalloc(sizeof(*f), GFP_ATOMIC);
659 f->flags = ndm_flags;
660 f->updated = f->used = jiffies;
661 INIT_LIST_HEAD(&f->remotes);
662 memcpy(f->eth_addr, mac, ETH_ALEN);
664 vxlan_fdb_append(f, ip, port, vni, ifindex);
667 hlist_add_head_rcu(&f->hlist,
668 vxlan_fdb_head(vxlan, mac));
672 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
677 static void vxlan_fdb_free(struct rcu_head *head)
679 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
680 struct vxlan_rdst *rd, *nd;
682 list_for_each_entry_safe(rd, nd, &f->remotes, list)
687 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
689 netdev_dbg(vxlan->dev,
690 "delete %pM\n", f->eth_addr);
693 vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
695 hlist_del_rcu(&f->hlist);
696 call_rcu(&f->rcu, vxlan_fdb_free);
699 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
700 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
702 struct net *net = dev_net(vxlan->dev);
706 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
710 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
711 if (remote->sa.sa_family == AF_INET) {
712 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
713 ip->sa.sa_family = AF_INET;
714 #if IS_ENABLED(CONFIG_IPV6)
716 ip->sin6.sin6_addr = in6addr_any;
717 ip->sa.sa_family = AF_INET6;
723 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
725 *port = nla_get_be16(tb[NDA_PORT]);
727 *port = vxlan->dst_port;
731 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
733 *vni = nla_get_u32(tb[NDA_VNI]);
735 *vni = vxlan->default_dst.remote_vni;
738 if (tb[NDA_IFINDEX]) {
739 struct net_device *tdev;
741 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
743 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
744 tdev = dev_get_by_index(net, *ifindex);
746 return -EADDRNOTAVAIL;
755 /* Add static entry (via netlink) */
756 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
757 struct net_device *dev,
758 const unsigned char *addr, u16 flags)
760 struct vxlan_dev *vxlan = netdev_priv(dev);
761 /* struct net *net = dev_net(vxlan->dev); */
767 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
768 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
773 if (tb[NDA_DST] == NULL)
776 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
780 spin_lock_bh(&vxlan->hash_lock);
781 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
782 port, vni, ifindex, ndm->ndm_flags);
783 spin_unlock_bh(&vxlan->hash_lock);
788 /* Delete entry (via netlink) */
789 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
790 struct net_device *dev,
791 const unsigned char *addr)
793 struct vxlan_dev *vxlan = netdev_priv(dev);
795 struct vxlan_rdst *rd = NULL;
801 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
807 spin_lock_bh(&vxlan->hash_lock);
808 f = vxlan_find_mac(vxlan, addr);
812 if (!vxlan_addr_any(&ip)) {
813 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
820 /* remove a destination if it's not the only one on the list,
821 * otherwise destroy the fdb entry
823 if (rd && !list_is_singular(&f->remotes)) {
824 list_del_rcu(&rd->list);
829 vxlan_fdb_destroy(vxlan, f);
832 spin_unlock_bh(&vxlan->hash_lock);
837 /* Dump forwarding table */
838 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
839 struct net_device *dev, int idx)
841 struct vxlan_dev *vxlan = netdev_priv(dev);
844 for (h = 0; h < FDB_HASH_SIZE; ++h) {
848 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
849 struct vxlan_rdst *rd;
851 if (idx < cb->args[0])
854 list_for_each_entry_rcu(rd, &f->remotes, list) {
855 err = vxlan_fdb_info(skb, vxlan, f,
856 NETLINK_CB(cb->skb).portid,
871 /* Watch incoming packets to learn mapping between Ethernet address
872 * and Tunnel endpoint.
873 * Return true if packet is bogus and should be droppped.
875 static bool vxlan_snoop(struct net_device *dev,
876 union vxlan_addr *src_ip, const u8 *src_mac)
878 struct vxlan_dev *vxlan = netdev_priv(dev);
881 f = vxlan_find_mac(vxlan, src_mac);
883 struct vxlan_rdst *rdst = first_remote_rcu(f);
885 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
888 /* Don't migrate static entries, drop packets */
889 if (f->state & NUD_NOARP)
894 "%pM migrated from %pIS to %pIS\n",
895 src_mac, &rdst->remote_ip, &src_ip);
897 rdst->remote_ip = *src_ip;
898 f->updated = jiffies;
899 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
901 /* learned new entry */
902 spin_lock(&vxlan->hash_lock);
904 /* close off race between vxlan_flush and incoming packets */
905 if (netif_running(dev))
906 vxlan_fdb_create(vxlan, src_mac, src_ip,
908 NLM_F_EXCL|NLM_F_CREATE,
910 vxlan->default_dst.remote_vni,
912 spin_unlock(&vxlan->hash_lock);
918 /* See if multicast group is already in use by other ID */
919 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
921 struct vxlan_dev *vxlan;
923 /* The vxlan_sock is only used by dev, leaving group has
924 * no effect on other vxlan devices.
926 if (atomic_read(&dev->vn_sock->refcnt) == 1)
929 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
930 if (!netif_running(vxlan->dev) || vxlan == dev)
933 if (vxlan->vn_sock != dev->vn_sock)
936 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
937 &dev->default_dst.remote_ip))
940 if (vxlan->default_dst.remote_ifindex !=
941 dev->default_dst.remote_ifindex)
950 static void vxlan_sock_hold(struct vxlan_sock *vs)
952 atomic_inc(&vs->refcnt);
955 void vxlan_sock_release(struct vxlan_sock *vs)
957 struct sock *sk = vs->sock->sk;
958 struct net *net = sock_net(sk);
959 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
961 if (!atomic_dec_and_test(&vs->refcnt))
964 spin_lock(&vn->sock_lock);
965 hlist_del_rcu(&vs->hlist);
966 rcu_assign_sk_user_data(vs->sock->sk, NULL);
967 vxlan_notify_del_rx_port(sk);
968 spin_unlock(&vn->sock_lock);
970 queue_work(vxlan_wq, &vs->del_work);
972 EXPORT_SYMBOL_GPL(vxlan_sock_release);
974 /* Callback to update multicast group membership when first VNI on
975 * multicast asddress is brought up
976 * Done as workqueue because ip_mc_join_group acquires RTNL.
978 static void vxlan_igmp_join(struct work_struct *work)
980 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
981 struct vxlan_sock *vs = vxlan->vn_sock;
982 struct sock *sk = vs->sock->sk;
983 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
984 int ifindex = vxlan->default_dst.remote_ifindex;
987 if (ip->sa.sa_family == AF_INET) {
988 struct ip_mreqn mreq = {
989 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
990 .imr_ifindex = ifindex,
993 ip_mc_join_group(sk, &mreq);
994 #if IS_ENABLED(CONFIG_IPV6)
996 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
997 &ip->sin6.sin6_addr);
1002 vxlan_sock_release(vs);
1003 dev_put(vxlan->dev);
1006 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1007 static void vxlan_igmp_leave(struct work_struct *work)
1009 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1010 struct vxlan_sock *vs = vxlan->vn_sock;
1011 struct sock *sk = vs->sock->sk;
1012 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1013 int ifindex = vxlan->default_dst.remote_ifindex;
1016 if (ip->sa.sa_family == AF_INET) {
1017 struct ip_mreqn mreq = {
1018 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1019 .imr_ifindex = ifindex,
1022 ip_mc_leave_group(sk, &mreq);
1023 #if IS_ENABLED(CONFIG_IPV6)
1025 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1026 &ip->sin6.sin6_addr);
1032 vxlan_sock_release(vs);
1033 dev_put(vxlan->dev);
1036 /* Callback from net/ipv4/udp.c to receive packets */
1037 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1039 struct vxlan_sock *vs;
1040 struct vxlanhdr *vxh;
1043 /* Need Vxlan and inner Ethernet header to be present */
1044 if (!pskb_may_pull(skb, VXLAN_HLEN))
1047 /* Return packets with reserved bits set */
1048 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1049 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1050 (vxh->vx_vni & htonl(0xff))) {
1051 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1052 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1056 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1059 port = inet_sk(sk)->inet_sport;
1061 vs = rcu_dereference_sk_user_data(sk);
1065 vs->rcv(vs, skb, vxh->vx_vni);
1069 /* Consume bad packet */
1074 /* Return non vxlan pkt */
1078 static void vxlan_rcv(struct vxlan_sock *vs,
1079 struct sk_buff *skb, __be32 vx_vni)
1081 struct iphdr *oip = NULL;
1082 struct ipv6hdr *oip6 = NULL;
1083 struct vxlan_dev *vxlan;
1084 struct pcpu_tstats *stats;
1085 union vxlan_addr saddr;
1088 union vxlan_addr *remote_ip;
1090 vni = ntohl(vx_vni) >> 8;
1091 /* Is this VNI defined? */
1092 vxlan = vxlan_vs_find_vni(vs, vni);
1096 remote_ip = &vxlan->default_dst.remote_ip;
1097 skb_reset_mac_header(skb);
1098 skb->protocol = eth_type_trans(skb, vxlan->dev);
1100 /* Ignore packet loops (and multicast echo) */
1101 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1104 /* Re-examine inner Ethernet packet */
1105 if (remote_ip->sa.sa_family == AF_INET) {
1107 saddr.sin.sin_addr.s_addr = oip->saddr;
1108 saddr.sa.sa_family = AF_INET;
1109 #if IS_ENABLED(CONFIG_IPV6)
1111 oip6 = ipv6_hdr(skb);
1112 saddr.sin6.sin6_addr = oip6->saddr;
1113 saddr.sa.sa_family = AF_INET6;
1117 if ((vxlan->flags & VXLAN_F_LEARN) &&
1118 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1121 skb_reset_network_header(skb);
1123 /* If the NIC driver gave us an encapsulated packet with
1124 * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled,
1125 * leave the CHECKSUM_UNNECESSARY, the device checksummed it
1126 * for us. Otherwise force the upper layers to verify it.
1128 if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation ||
1129 !(vxlan->dev->features & NETIF_F_RXCSUM))
1130 skb->ip_summed = CHECKSUM_NONE;
1132 skb->encapsulation = 0;
1135 err = IP6_ECN_decapsulate(oip6, skb);
1137 err = IP_ECN_decapsulate(oip, skb);
1139 if (unlikely(err)) {
1140 if (log_ecn_error) {
1142 net_info_ratelimited("non-ECT from %pI6\n",
1145 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1146 &oip->saddr, oip->tos);
1149 ++vxlan->dev->stats.rx_frame_errors;
1150 ++vxlan->dev->stats.rx_errors;
1155 stats = this_cpu_ptr(vxlan->dev->tstats);
1156 u64_stats_update_begin(&stats->syncp);
1157 stats->rx_packets++;
1158 stats->rx_bytes += skb->len;
1159 u64_stats_update_end(&stats->syncp);
1165 /* Consume bad packet */
1169 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1171 struct vxlan_dev *vxlan = netdev_priv(dev);
1172 struct arphdr *parp;
1175 struct neighbour *n;
1177 if (dev->flags & IFF_NOARP)
1180 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1181 dev->stats.tx_dropped++;
1184 parp = arp_hdr(skb);
1186 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1187 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1188 parp->ar_pro != htons(ETH_P_IP) ||
1189 parp->ar_op != htons(ARPOP_REQUEST) ||
1190 parp->ar_hln != dev->addr_len ||
1193 arpptr = (u8 *)parp + sizeof(struct arphdr);
1195 arpptr += dev->addr_len; /* sha */
1196 memcpy(&sip, arpptr, sizeof(sip));
1197 arpptr += sizeof(sip);
1198 arpptr += dev->addr_len; /* tha */
1199 memcpy(&tip, arpptr, sizeof(tip));
1201 if (ipv4_is_loopback(tip) ||
1202 ipv4_is_multicast(tip))
1205 n = neigh_lookup(&arp_tbl, &tip, dev);
1208 struct vxlan_fdb *f;
1209 struct sk_buff *reply;
1211 if (!(n->nud_state & NUD_CONNECTED)) {
1216 f = vxlan_find_mac(vxlan, n->ha);
1217 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1218 /* bridge-local neighbor */
1223 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1228 skb_reset_mac_header(reply);
1229 __skb_pull(reply, skb_network_offset(reply));
1230 reply->ip_summed = CHECKSUM_UNNECESSARY;
1231 reply->pkt_type = PACKET_HOST;
1233 if (netif_rx_ni(reply) == NET_RX_DROP)
1234 dev->stats.rx_dropped++;
1235 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1236 union vxlan_addr ipa = {
1237 .sin.sin_addr.s_addr = tip,
1238 .sa.sa_family = AF_INET,
1241 vxlan_ip_miss(dev, &ipa);
1245 return NETDEV_TX_OK;
1248 #if IS_ENABLED(CONFIG_IPV6)
1249 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1251 struct vxlan_dev *vxlan = netdev_priv(dev);
1252 struct neighbour *n;
1253 union vxlan_addr ipa;
1254 const struct ipv6hdr *iphdr;
1255 const struct in6_addr *saddr, *daddr;
1257 struct inet6_dev *in6_dev = NULL;
1259 in6_dev = __in6_dev_get(dev);
1263 if (!pskb_may_pull(skb, skb->len))
1266 iphdr = ipv6_hdr(skb);
1267 saddr = &iphdr->saddr;
1268 daddr = &iphdr->daddr;
1270 if (ipv6_addr_loopback(daddr) ||
1271 ipv6_addr_is_multicast(daddr))
1274 msg = (struct nd_msg *)skb_transport_header(skb);
1275 if (msg->icmph.icmp6_code != 0 ||
1276 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1279 n = neigh_lookup(ipv6_stub->nd_tbl, daddr, dev);
1282 struct vxlan_fdb *f;
1284 if (!(n->nud_state & NUD_CONNECTED)) {
1289 f = vxlan_find_mac(vxlan, n->ha);
1290 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1291 /* bridge-local neighbor */
1296 ipv6_stub->ndisc_send_na(dev, n, saddr, &msg->target,
1297 !!in6_dev->cnf.forwarding,
1298 true, false, false);
1300 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1301 ipa.sin6.sin6_addr = *daddr;
1302 ipa.sa.sa_family = AF_INET6;
1303 vxlan_ip_miss(dev, &ipa);
1308 return NETDEV_TX_OK;
1312 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1314 struct vxlan_dev *vxlan = netdev_priv(dev);
1315 struct neighbour *n;
1317 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1321 switch (ntohs(eth_hdr(skb)->h_proto)) {
1326 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1329 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1330 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1331 union vxlan_addr ipa = {
1332 .sin.sin_addr.s_addr = pip->daddr,
1333 .sa.sa_family = AF_INET,
1336 vxlan_ip_miss(dev, &ipa);
1342 #if IS_ENABLED(CONFIG_IPV6)
1345 struct ipv6hdr *pip6;
1347 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1349 pip6 = ipv6_hdr(skb);
1350 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1351 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1352 union vxlan_addr ipa = {
1353 .sin6.sin6_addr = pip6->daddr,
1354 .sa.sa_family = AF_INET6,
1357 vxlan_ip_miss(dev, &ipa);
1371 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1373 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1375 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1384 static void vxlan_sock_put(struct sk_buff *skb)
1389 /* On transmit, associate with the tunnel socket */
1390 static void vxlan_set_owner(struct sock *sk, struct sk_buff *skb)
1395 skb->destructor = vxlan_sock_put;
1398 /* Compute source port for outgoing packet
1399 * first choice to use L4 flow hash since it will spread
1400 * better and maybe available from hardware
1401 * secondary choice is to use jhash on the Ethernet header
1403 __be16 vxlan_src_port(__u16 port_min, __u16 port_max, struct sk_buff *skb)
1405 unsigned int range = (port_max - port_min) + 1;
1408 hash = skb_get_hash(skb);
1410 hash = jhash(skb->data, 2 * ETH_ALEN,
1411 (__force u32) skb->protocol);
1413 return htons((((u64) hash * range) >> 32) + port_min);
1415 EXPORT_SYMBOL_GPL(vxlan_src_port);
1417 static int handle_offloads(struct sk_buff *skb)
1419 if (skb_is_gso(skb)) {
1420 int err = skb_unclone(skb, GFP_ATOMIC);
1424 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
1425 } else if (skb->ip_summed != CHECKSUM_PARTIAL)
1426 skb->ip_summed = CHECKSUM_NONE;
1431 #if IS_ENABLED(CONFIG_IPV6)
1432 static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1433 struct dst_entry *dst, struct sk_buff *skb,
1434 struct net_device *dev, struct in6_addr *saddr,
1435 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1436 __be16 src_port, __be16 dst_port, __be32 vni)
1438 struct ipv6hdr *ip6h;
1439 struct vxlanhdr *vxh;
1444 if (!skb->encapsulation) {
1445 skb_reset_inner_headers(skb);
1446 skb->encapsulation = 1;
1449 skb_scrub_packet(skb, false);
1451 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1452 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1453 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1455 /* Need space for new headers (invalidates iph ptr) */
1456 err = skb_cow_head(skb, min_headroom);
1460 if (vlan_tx_tag_present(skb)) {
1461 if (WARN_ON(!__vlan_put_tag(skb,
1463 vlan_tx_tag_get(skb))))
1469 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1470 vxh->vx_flags = htonl(VXLAN_FLAGS);
1473 __skb_push(skb, sizeof(*uh));
1474 skb_reset_transport_header(skb);
1477 uh->dest = dst_port;
1478 uh->source = src_port;
1480 uh->len = htons(skb->len);
1483 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1484 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
1486 skb_dst_set(skb, dst);
1488 if (!skb_is_gso(skb) && !(dst->dev->features & NETIF_F_IPV6_CSUM)) {
1489 __wsum csum = skb_checksum(skb, 0, skb->len, 0);
1490 skb->ip_summed = CHECKSUM_UNNECESSARY;
1491 uh->check = csum_ipv6_magic(saddr, daddr, skb->len,
1494 uh->check = CSUM_MANGLED_0;
1496 skb->ip_summed = CHECKSUM_PARTIAL;
1497 skb->csum_start = skb_transport_header(skb) - skb->head;
1498 skb->csum_offset = offsetof(struct udphdr, check);
1499 uh->check = ~csum_ipv6_magic(saddr, daddr,
1500 skb->len, IPPROTO_UDP, 0);
1503 __skb_push(skb, sizeof(*ip6h));
1504 skb_reset_network_header(skb);
1505 ip6h = ipv6_hdr(skb);
1507 ip6h->priority = prio;
1508 ip6h->flow_lbl[0] = 0;
1509 ip6h->flow_lbl[1] = 0;
1510 ip6h->flow_lbl[2] = 0;
1511 ip6h->payload_len = htons(skb->len);
1512 ip6h->nexthdr = IPPROTO_UDP;
1513 ip6h->hop_limit = ttl;
1514 ip6h->daddr = *daddr;
1515 ip6h->saddr = *saddr;
1517 vxlan_set_owner(vs->sock->sk, skb);
1519 err = handle_offloads(skb);
1523 ip6tunnel_xmit(skb, dev);
1528 int vxlan_xmit_skb(struct vxlan_sock *vs,
1529 struct rtable *rt, struct sk_buff *skb,
1530 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1531 __be16 src_port, __be16 dst_port, __be32 vni)
1533 struct vxlanhdr *vxh;
1538 if (!skb->encapsulation) {
1539 skb_reset_inner_headers(skb);
1540 skb->encapsulation = 1;
1543 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1544 + VXLAN_HLEN + sizeof(struct iphdr)
1545 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1547 /* Need space for new headers (invalidates iph ptr) */
1548 err = skb_cow_head(skb, min_headroom);
1552 if (vlan_tx_tag_present(skb)) {
1553 if (WARN_ON(!__vlan_put_tag(skb,
1555 vlan_tx_tag_get(skb))))
1561 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1562 vxh->vx_flags = htonl(VXLAN_FLAGS);
1565 __skb_push(skb, sizeof(*uh));
1566 skb_reset_transport_header(skb);
1569 uh->dest = dst_port;
1570 uh->source = src_port;
1572 uh->len = htons(skb->len);
1575 vxlan_set_owner(vs->sock->sk, skb);
1577 err = handle_offloads(skb);
1581 return iptunnel_xmit(rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df,
1584 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1586 /* Bypass encapsulation if the destination is local */
1587 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1588 struct vxlan_dev *dst_vxlan)
1590 struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1591 struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1592 union vxlan_addr loopback;
1593 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1595 skb->pkt_type = PACKET_HOST;
1596 skb->encapsulation = 0;
1597 skb->dev = dst_vxlan->dev;
1598 __skb_pull(skb, skb_network_offset(skb));
1600 if (remote_ip->sa.sa_family == AF_INET) {
1601 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1602 loopback.sa.sa_family = AF_INET;
1603 #if IS_ENABLED(CONFIG_IPV6)
1605 loopback.sin6.sin6_addr = in6addr_loopback;
1606 loopback.sa.sa_family = AF_INET6;
1610 if (dst_vxlan->flags & VXLAN_F_LEARN)
1611 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1613 u64_stats_update_begin(&tx_stats->syncp);
1614 tx_stats->tx_packets++;
1615 tx_stats->tx_bytes += skb->len;
1616 u64_stats_update_end(&tx_stats->syncp);
1618 if (netif_rx(skb) == NET_RX_SUCCESS) {
1619 u64_stats_update_begin(&rx_stats->syncp);
1620 rx_stats->rx_packets++;
1621 rx_stats->rx_bytes += skb->len;
1622 u64_stats_update_end(&rx_stats->syncp);
1624 skb->dev->stats.rx_dropped++;
1628 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1629 struct vxlan_rdst *rdst, bool did_rsc)
1631 struct vxlan_dev *vxlan = netdev_priv(dev);
1632 struct rtable *rt = NULL;
1633 const struct iphdr *old_iph;
1635 union vxlan_addr *dst;
1636 __be16 src_port = 0, dst_port;
1642 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1643 vni = rdst->remote_vni;
1644 dst = &rdst->remote_ip;
1646 if (vxlan_addr_any(dst)) {
1648 /* short-circuited back to local bridge */
1649 vxlan_encap_bypass(skb, vxlan, vxlan);
1655 old_iph = ip_hdr(skb);
1658 if (!ttl && vxlan_addr_multicast(dst))
1663 tos = ip_tunnel_get_dsfield(old_iph, skb);
1665 src_port = vxlan_src_port(vxlan->port_min, vxlan->port_max, skb);
1667 if (dst->sa.sa_family == AF_INET) {
1668 memset(&fl4, 0, sizeof(fl4));
1669 fl4.flowi4_oif = rdst->remote_ifindex;
1670 fl4.flowi4_tos = RT_TOS(tos);
1671 fl4.daddr = dst->sin.sin_addr.s_addr;
1672 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1674 rt = ip_route_output_key(dev_net(dev), &fl4);
1676 netdev_dbg(dev, "no route to %pI4\n",
1677 &dst->sin.sin_addr.s_addr);
1678 dev->stats.tx_carrier_errors++;
1682 if (rt->dst.dev == dev) {
1683 netdev_dbg(dev, "circular route to %pI4\n",
1684 &dst->sin.sin_addr.s_addr);
1685 dev->stats.collisions++;
1689 /* Bypass encapsulation if the destination is local */
1690 if (rt->rt_flags & RTCF_LOCAL &&
1691 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1692 struct vxlan_dev *dst_vxlan;
1695 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1698 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1702 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1703 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1705 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1706 fl4.saddr, dst->sin.sin_addr.s_addr,
1707 tos, ttl, df, src_port, dst_port,
1712 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1713 #if IS_ENABLED(CONFIG_IPV6)
1715 struct sock *sk = vxlan->vn_sock->sock->sk;
1716 struct dst_entry *ndst;
1720 memset(&fl6, 0, sizeof(fl6));
1721 fl6.flowi6_oif = rdst->remote_ifindex;
1722 fl6.daddr = dst->sin6.sin6_addr;
1723 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1724 fl6.flowi6_proto = IPPROTO_UDP;
1726 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1727 netdev_dbg(dev, "no route to %pI6\n",
1728 &dst->sin6.sin6_addr);
1729 dev->stats.tx_carrier_errors++;
1733 if (ndst->dev == dev) {
1734 netdev_dbg(dev, "circular route to %pI6\n",
1735 &dst->sin6.sin6_addr);
1737 dev->stats.collisions++;
1741 /* Bypass encapsulation if the destination is local */
1742 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1743 if (flags & RTF_LOCAL &&
1744 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1745 struct vxlan_dev *dst_vxlan;
1748 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1751 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1755 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1757 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
1758 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1759 src_port, dst_port, htonl(vni << 8));
1766 dev->stats.tx_dropped++;
1772 dev->stats.tx_errors++;
1777 /* Transmit local packets over Vxlan
1779 * Outer IP header inherits ECN and DF from inner header.
1780 * Outer UDP destination is the VXLAN assigned port.
1781 * source port is based on hash of flow
1783 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1785 struct vxlan_dev *vxlan = netdev_priv(dev);
1787 bool did_rsc = false;
1788 struct vxlan_rdst *rdst;
1789 struct vxlan_fdb *f;
1791 skb_reset_mac_header(skb);
1794 if ((vxlan->flags & VXLAN_F_PROXY)) {
1795 if (ntohs(eth->h_proto) == ETH_P_ARP)
1796 return arp_reduce(dev, skb);
1797 #if IS_ENABLED(CONFIG_IPV6)
1798 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1799 skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
1800 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1803 msg = (struct nd_msg *)skb_transport_header(skb);
1804 if (msg->icmph.icmp6_code == 0 &&
1805 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1806 return neigh_reduce(dev, skb);
1811 f = vxlan_find_mac(vxlan, eth->h_dest);
1814 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1815 (ntohs(eth->h_proto) == ETH_P_IP ||
1816 ntohs(eth->h_proto) == ETH_P_IPV6)) {
1817 did_rsc = route_shortcircuit(dev, skb);
1819 f = vxlan_find_mac(vxlan, eth->h_dest);
1823 f = vxlan_find_mac(vxlan, all_zeros_mac);
1825 if ((vxlan->flags & VXLAN_F_L2MISS) &&
1826 !is_multicast_ether_addr(eth->h_dest))
1827 vxlan_fdb_miss(vxlan, eth->h_dest);
1829 dev->stats.tx_dropped++;
1831 return NETDEV_TX_OK;
1835 list_for_each_entry_rcu(rdst, &f->remotes, list) {
1836 struct sk_buff *skb1;
1838 skb1 = skb_clone(skb, GFP_ATOMIC);
1840 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1844 return NETDEV_TX_OK;
1847 /* Walk the forwarding table and purge stale entries */
1848 static void vxlan_cleanup(unsigned long arg)
1850 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1851 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1854 if (!netif_running(vxlan->dev))
1857 spin_lock_bh(&vxlan->hash_lock);
1858 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1859 struct hlist_node *p, *n;
1860 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1862 = container_of(p, struct vxlan_fdb, hlist);
1863 unsigned long timeout;
1865 if (f->state & NUD_PERMANENT)
1868 timeout = f->used + vxlan->age_interval * HZ;
1869 if (time_before_eq(timeout, jiffies)) {
1870 netdev_dbg(vxlan->dev,
1871 "garbage collect %pM\n",
1873 f->state = NUD_STALE;
1874 vxlan_fdb_destroy(vxlan, f);
1875 } else if (time_before(timeout, next_timer))
1876 next_timer = timeout;
1879 spin_unlock_bh(&vxlan->hash_lock);
1881 mod_timer(&vxlan->age_timer, next_timer);
1884 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
1886 __u32 vni = vxlan->default_dst.remote_vni;
1888 vxlan->vn_sock = vs;
1889 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1892 /* Setup stats when device is created */
1893 static int vxlan_init(struct net_device *dev)
1895 struct vxlan_dev *vxlan = netdev_priv(dev);
1896 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1897 struct vxlan_sock *vs;
1900 dev->tstats = alloc_percpu(struct pcpu_tstats);
1904 for_each_possible_cpu(i) {
1905 struct pcpu_tstats *vxlan_stats;
1906 vxlan_stats = per_cpu_ptr(dev->tstats, i);
1907 u64_stats_init(&vxlan_stats->syncp);
1911 spin_lock(&vn->sock_lock);
1912 vs = vxlan_find_sock(dev_net(dev), vxlan->dst_port);
1914 /* If we have a socket with same port already, reuse it */
1915 atomic_inc(&vs->refcnt);
1916 vxlan_vs_add_dev(vs, vxlan);
1918 /* otherwise make new socket outside of RTNL */
1920 queue_work(vxlan_wq, &vxlan->sock_work);
1922 spin_unlock(&vn->sock_lock);
1927 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
1929 struct vxlan_fdb *f;
1931 spin_lock_bh(&vxlan->hash_lock);
1932 f = __vxlan_find_mac(vxlan, all_zeros_mac);
1934 vxlan_fdb_destroy(vxlan, f);
1935 spin_unlock_bh(&vxlan->hash_lock);
1938 static void vxlan_uninit(struct net_device *dev)
1940 struct vxlan_dev *vxlan = netdev_priv(dev);
1941 struct vxlan_sock *vs = vxlan->vn_sock;
1943 vxlan_fdb_delete_default(vxlan);
1946 vxlan_sock_release(vs);
1947 free_percpu(dev->tstats);
1950 /* Start ageing timer and join group when device is brought up */
1951 static int vxlan_open(struct net_device *dev)
1953 struct vxlan_dev *vxlan = netdev_priv(dev);
1954 struct vxlan_sock *vs = vxlan->vn_sock;
1956 /* socket hasn't been created */
1960 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
1961 vxlan_sock_hold(vs);
1963 queue_work(vxlan_wq, &vxlan->igmp_join);
1966 if (vxlan->age_interval)
1967 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
1972 /* Purge the forwarding table */
1973 static void vxlan_flush(struct vxlan_dev *vxlan)
1977 spin_lock_bh(&vxlan->hash_lock);
1978 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1979 struct hlist_node *p, *n;
1980 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1982 = container_of(p, struct vxlan_fdb, hlist);
1983 /* the all_zeros_mac entry is deleted at vxlan_uninit */
1984 if (!is_zero_ether_addr(f->eth_addr))
1985 vxlan_fdb_destroy(vxlan, f);
1988 spin_unlock_bh(&vxlan->hash_lock);
1991 /* Cleanup timer and forwarding table on shutdown */
1992 static int vxlan_stop(struct net_device *dev)
1994 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1995 struct vxlan_dev *vxlan = netdev_priv(dev);
1996 struct vxlan_sock *vs = vxlan->vn_sock;
1998 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
1999 !vxlan_group_used(vn, vxlan)) {
2000 vxlan_sock_hold(vs);
2002 queue_work(vxlan_wq, &vxlan->igmp_leave);
2005 del_timer_sync(&vxlan->age_timer);
2012 /* Stub, nothing needs to be done. */
2013 static void vxlan_set_multicast_list(struct net_device *dev)
2017 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2019 struct vxlan_dev *vxlan = netdev_priv(dev);
2020 struct vxlan_rdst *dst = &vxlan->default_dst;
2021 struct net_device *lowerdev;
2024 lowerdev = __dev_get_by_index(dev_net(dev), dst->remote_ifindex);
2025 if (lowerdev == NULL)
2026 return eth_change_mtu(dev, new_mtu);
2028 if (dst->remote_ip.sa.sa_family == AF_INET6)
2029 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2031 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2033 if (new_mtu < 68 || new_mtu > max_mtu)
2040 static const struct net_device_ops vxlan_netdev_ops = {
2041 .ndo_init = vxlan_init,
2042 .ndo_uninit = vxlan_uninit,
2043 .ndo_open = vxlan_open,
2044 .ndo_stop = vxlan_stop,
2045 .ndo_start_xmit = vxlan_xmit,
2046 .ndo_get_stats64 = ip_tunnel_get_stats64,
2047 .ndo_set_rx_mode = vxlan_set_multicast_list,
2048 .ndo_change_mtu = vxlan_change_mtu,
2049 .ndo_validate_addr = eth_validate_addr,
2050 .ndo_set_mac_address = eth_mac_addr,
2051 .ndo_fdb_add = vxlan_fdb_add,
2052 .ndo_fdb_del = vxlan_fdb_delete,
2053 .ndo_fdb_dump = vxlan_fdb_dump,
2056 /* Info for udev, that this is a virtual tunnel endpoint */
2057 static struct device_type vxlan_type = {
2061 /* Calls the ndo_add_vxlan_port of the caller in order to
2062 * supply the listening VXLAN udp ports. Callers are expected
2063 * to implement the ndo_add_vxlan_port.
2065 void vxlan_get_rx_port(struct net_device *dev)
2067 struct vxlan_sock *vs;
2068 struct net *net = dev_net(dev);
2069 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2070 sa_family_t sa_family;
2074 spin_lock(&vn->sock_lock);
2075 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2076 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2077 port = inet_sk(vs->sock->sk)->inet_sport;
2078 sa_family = vs->sock->sk->sk_family;
2079 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2083 spin_unlock(&vn->sock_lock);
2085 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2087 /* Initialize the device structure. */
2088 static void vxlan_setup(struct net_device *dev)
2090 struct vxlan_dev *vxlan = netdev_priv(dev);
2094 eth_hw_addr_random(dev);
2096 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2097 dev->hard_header_len = ETH_HLEN + VXLAN6_HEADROOM;
2099 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
2101 dev->netdev_ops = &vxlan_netdev_ops;
2102 dev->destructor = free_netdev;
2103 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2105 dev->tx_queue_len = 0;
2106 dev->features |= NETIF_F_LLTX;
2107 dev->features |= NETIF_F_NETNS_LOCAL;
2108 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2109 dev->features |= NETIF_F_RXCSUM;
2110 dev->features |= NETIF_F_GSO_SOFTWARE;
2112 dev->vlan_features = dev->features;
2113 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2114 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2115 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2116 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2117 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
2118 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2120 INIT_LIST_HEAD(&vxlan->next);
2121 spin_lock_init(&vxlan->hash_lock);
2122 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2123 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2124 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2126 init_timer_deferrable(&vxlan->age_timer);
2127 vxlan->age_timer.function = vxlan_cleanup;
2128 vxlan->age_timer.data = (unsigned long) vxlan;
2130 inet_get_local_port_range(dev_net(dev), &low, &high);
2131 vxlan->port_min = low;
2132 vxlan->port_max = high;
2133 vxlan->dst_port = htons(vxlan_port);
2137 for (h = 0; h < FDB_HASH_SIZE; ++h)
2138 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2141 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2142 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2143 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2144 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2145 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2146 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2147 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2148 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2149 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2150 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2151 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2152 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2153 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2154 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2155 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2156 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2157 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2158 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2161 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2163 if (tb[IFLA_ADDRESS]) {
2164 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2165 pr_debug("invalid link address (not ethernet)\n");
2169 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2170 pr_debug("invalid all zero ethernet address\n");
2171 return -EADDRNOTAVAIL;
2178 if (data[IFLA_VXLAN_ID]) {
2179 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2180 if (id >= VXLAN_VID_MASK)
2184 if (data[IFLA_VXLAN_PORT_RANGE]) {
2185 const struct ifla_vxlan_port_range *p
2186 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2188 if (ntohs(p->high) < ntohs(p->low)) {
2189 pr_debug("port range %u .. %u not valid\n",
2190 ntohs(p->low), ntohs(p->high));
2198 static void vxlan_get_drvinfo(struct net_device *netdev,
2199 struct ethtool_drvinfo *drvinfo)
2201 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2202 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2205 static const struct ethtool_ops vxlan_ethtool_ops = {
2206 .get_drvinfo = vxlan_get_drvinfo,
2207 .get_link = ethtool_op_get_link,
2210 static void vxlan_del_work(struct work_struct *work)
2212 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2214 sk_release_kernel(vs->sock->sk);
2218 #if IS_ENABLED(CONFIG_IPV6)
2219 /* Create UDP socket for encapsulation receive. AF_INET6 socket
2220 * could be used for both IPv4 and IPv6 communications, but
2221 * users may set bindv6only=1.
2223 static struct socket *create_v6_sock(struct net *net, __be16 port)
2226 struct socket *sock;
2227 struct sockaddr_in6 vxlan_addr = {
2228 .sin6_family = AF_INET6,
2233 rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
2235 pr_debug("UDPv6 socket create failed\n");
2239 /* Put in proper namespace */
2241 sk_change_net(sk, net);
2243 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
2244 (char *)&val, sizeof(val));
2245 rc = kernel_bind(sock, (struct sockaddr *)&vxlan_addr,
2246 sizeof(struct sockaddr_in6));
2248 pr_debug("bind for UDPv6 socket %pI6:%u (%d)\n",
2249 &vxlan_addr.sin6_addr, ntohs(vxlan_addr.sin6_port), rc);
2250 sk_release_kernel(sk);
2253 /* At this point, IPv6 module should have been loaded in
2254 * sock_create_kern().
2258 /* Disable multicast loopback */
2259 inet_sk(sk)->mc_loop = 0;
2265 static struct socket *create_v6_sock(struct net *net, __be16 port)
2267 return ERR_PTR(-EPFNOSUPPORT);
2271 static struct socket *create_v4_sock(struct net *net, __be16 port)
2274 struct socket *sock;
2275 struct sockaddr_in vxlan_addr = {
2276 .sin_family = AF_INET,
2277 .sin_addr.s_addr = htonl(INADDR_ANY),
2282 /* Create UDP socket for encapsulation receive. */
2283 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
2285 pr_debug("UDP socket create failed\n");
2289 /* Put in proper namespace */
2291 sk_change_net(sk, net);
2293 rc = kernel_bind(sock, (struct sockaddr *) &vxlan_addr,
2294 sizeof(vxlan_addr));
2296 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
2297 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
2298 sk_release_kernel(sk);
2302 /* Disable multicast loopback */
2303 inet_sk(sk)->mc_loop = 0;
2307 /* Create new listen socket if needed */
2308 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2309 vxlan_rcv_t *rcv, void *data, bool ipv6)
2311 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2312 struct vxlan_sock *vs;
2313 struct socket *sock;
2317 vs = kmalloc(sizeof(*vs), GFP_KERNEL);
2319 return ERR_PTR(-ENOMEM);
2321 for (h = 0; h < VNI_HASH_SIZE; ++h)
2322 INIT_HLIST_HEAD(&vs->vni_list[h]);
2324 INIT_WORK(&vs->del_work, vxlan_del_work);
2327 sock = create_v6_sock(net, port);
2329 sock = create_v4_sock(net, port);
2332 return ERR_CAST(sock);
2337 atomic_set(&vs->refcnt, 1);
2340 rcu_assign_sk_user_data(vs->sock->sk, vs);
2342 spin_lock(&vn->sock_lock);
2343 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2344 vxlan_notify_add_rx_port(sk);
2345 spin_unlock(&vn->sock_lock);
2347 /* Mark socket as an encapsulation socket. */
2348 udp_sk(sk)->encap_type = 1;
2349 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
2350 #if IS_ENABLED(CONFIG_IPV6)
2352 ipv6_stub->udpv6_encap_enable();
2360 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2361 vxlan_rcv_t *rcv, void *data,
2362 bool no_share, bool ipv6)
2364 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2365 struct vxlan_sock *vs;
2367 vs = vxlan_socket_create(net, port, rcv, data, ipv6);
2371 if (no_share) /* Return error if sharing is not allowed. */
2374 spin_lock(&vn->sock_lock);
2375 vs = vxlan_find_sock(net, port);
2378 atomic_inc(&vs->refcnt);
2380 vs = ERR_PTR(-EBUSY);
2382 spin_unlock(&vn->sock_lock);
2385 vs = ERR_PTR(-EINVAL);
2389 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2391 /* Scheduled at device creation to bind to a socket */
2392 static void vxlan_sock_work(struct work_struct *work)
2394 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2395 struct net *net = dev_net(vxlan->dev);
2396 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2397 __be16 port = vxlan->dst_port;
2398 struct vxlan_sock *nvs;
2400 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags & VXLAN_F_IPV6);
2401 spin_lock(&vn->sock_lock);
2403 vxlan_vs_add_dev(nvs, vxlan);
2404 spin_unlock(&vn->sock_lock);
2406 dev_put(vxlan->dev);
2409 static int vxlan_newlink(struct net *net, struct net_device *dev,
2410 struct nlattr *tb[], struct nlattr *data[])
2412 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2413 struct vxlan_dev *vxlan = netdev_priv(dev);
2414 struct vxlan_rdst *dst = &vxlan->default_dst;
2417 bool use_ipv6 = false;
2419 if (!data[IFLA_VXLAN_ID])
2422 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2423 dst->remote_vni = vni;
2425 if (data[IFLA_VXLAN_GROUP]) {
2426 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2427 dst->remote_ip.sa.sa_family = AF_INET;
2428 } else if (data[IFLA_VXLAN_GROUP6]) {
2429 if (!IS_ENABLED(CONFIG_IPV6))
2430 return -EPFNOSUPPORT;
2432 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2433 sizeof(struct in6_addr));
2434 dst->remote_ip.sa.sa_family = AF_INET6;
2438 if (data[IFLA_VXLAN_LOCAL]) {
2439 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2440 vxlan->saddr.sa.sa_family = AF_INET;
2441 } else if (data[IFLA_VXLAN_LOCAL6]) {
2442 if (!IS_ENABLED(CONFIG_IPV6))
2443 return -EPFNOSUPPORT;
2445 /* TODO: respect scope id */
2446 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2447 sizeof(struct in6_addr));
2448 vxlan->saddr.sa.sa_family = AF_INET6;
2452 if (data[IFLA_VXLAN_LINK] &&
2453 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2454 struct net_device *lowerdev
2455 = __dev_get_by_index(net, dst->remote_ifindex);
2458 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2462 #if IS_ENABLED(CONFIG_IPV6)
2464 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2465 if (idev && idev->cnf.disable_ipv6) {
2466 pr_info("IPv6 is disabled via sysctl\n");
2469 vxlan->flags |= VXLAN_F_IPV6;
2474 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2476 /* update header length based on lower device */
2477 dev->hard_header_len = lowerdev->hard_header_len +
2478 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2481 if (data[IFLA_VXLAN_TOS])
2482 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2484 if (data[IFLA_VXLAN_TTL])
2485 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2487 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2488 vxlan->flags |= VXLAN_F_LEARN;
2490 if (data[IFLA_VXLAN_AGEING])
2491 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2493 vxlan->age_interval = FDB_AGE_DEFAULT;
2495 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2496 vxlan->flags |= VXLAN_F_PROXY;
2498 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2499 vxlan->flags |= VXLAN_F_RSC;
2501 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2502 vxlan->flags |= VXLAN_F_L2MISS;
2504 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2505 vxlan->flags |= VXLAN_F_L3MISS;
2507 if (data[IFLA_VXLAN_LIMIT])
2508 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2510 if (data[IFLA_VXLAN_PORT_RANGE]) {
2511 const struct ifla_vxlan_port_range *p
2512 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2513 vxlan->port_min = ntohs(p->low);
2514 vxlan->port_max = ntohs(p->high);
2517 if (data[IFLA_VXLAN_PORT])
2518 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2520 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
2521 pr_info("duplicate VNI %u\n", vni);
2525 SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
2527 /* create an fdb entry for a valid default destination */
2528 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2529 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2530 &vxlan->default_dst.remote_ip,
2531 NUD_REACHABLE|NUD_PERMANENT,
2532 NLM_F_EXCL|NLM_F_CREATE,
2534 vxlan->default_dst.remote_vni,
2535 vxlan->default_dst.remote_ifindex,
2541 err = register_netdevice(dev);
2543 vxlan_fdb_delete_default(vxlan);
2547 list_add(&vxlan->next, &vn->vxlan_list);
2552 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2554 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2555 struct vxlan_dev *vxlan = netdev_priv(dev);
2557 spin_lock(&vn->sock_lock);
2558 if (!hlist_unhashed(&vxlan->hlist))
2559 hlist_del_rcu(&vxlan->hlist);
2560 spin_unlock(&vn->sock_lock);
2562 list_del(&vxlan->next);
2563 unregister_netdevice_queue(dev, head);
2566 static size_t vxlan_get_size(const struct net_device *dev)
2569 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2570 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2571 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2572 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2573 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2574 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2575 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2576 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2577 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2578 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2579 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2580 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2581 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2582 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2583 nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
2587 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2589 const struct vxlan_dev *vxlan = netdev_priv(dev);
2590 const struct vxlan_rdst *dst = &vxlan->default_dst;
2591 struct ifla_vxlan_port_range ports = {
2592 .low = htons(vxlan->port_min),
2593 .high = htons(vxlan->port_max),
2596 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2597 goto nla_put_failure;
2599 if (!vxlan_addr_any(&dst->remote_ip)) {
2600 if (dst->remote_ip.sa.sa_family == AF_INET) {
2601 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2602 dst->remote_ip.sin.sin_addr.s_addr))
2603 goto nla_put_failure;
2604 #if IS_ENABLED(CONFIG_IPV6)
2606 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2607 &dst->remote_ip.sin6.sin6_addr))
2608 goto nla_put_failure;
2613 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2614 goto nla_put_failure;
2616 if (!vxlan_addr_any(&vxlan->saddr)) {
2617 if (vxlan->saddr.sa.sa_family == AF_INET) {
2618 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2619 vxlan->saddr.sin.sin_addr.s_addr))
2620 goto nla_put_failure;
2621 #if IS_ENABLED(CONFIG_IPV6)
2623 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2624 &vxlan->saddr.sin6.sin6_addr))
2625 goto nla_put_failure;
2630 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2631 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2632 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2633 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2634 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2635 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2636 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2637 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2638 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2639 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2640 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2641 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2642 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2643 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
2644 goto nla_put_failure;
2646 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2647 goto nla_put_failure;
2655 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2657 .maxtype = IFLA_VXLAN_MAX,
2658 .policy = vxlan_policy,
2659 .priv_size = sizeof(struct vxlan_dev),
2660 .setup = vxlan_setup,
2661 .validate = vxlan_validate,
2662 .newlink = vxlan_newlink,
2663 .dellink = vxlan_dellink,
2664 .get_size = vxlan_get_size,
2665 .fill_info = vxlan_fill_info,
2668 static __net_init int vxlan_init_net(struct net *net)
2670 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2673 INIT_LIST_HEAD(&vn->vxlan_list);
2674 spin_lock_init(&vn->sock_lock);
2676 for (h = 0; h < PORT_HASH_SIZE; ++h)
2677 INIT_HLIST_HEAD(&vn->sock_list[h]);
2682 static __net_exit void vxlan_exit_net(struct net *net)
2684 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2685 struct vxlan_dev *vxlan;
2689 list_for_each_entry(vxlan, &vn->vxlan_list, next)
2690 unregister_netdevice_queue(vxlan->dev, &list);
2691 unregister_netdevice_many(&list);
2695 static struct pernet_operations vxlan_net_ops = {
2696 .init = vxlan_init_net,
2697 .exit = vxlan_exit_net,
2698 .id = &vxlan_net_id,
2699 .size = sizeof(struct vxlan_net),
2702 static int __init vxlan_init_module(void)
2706 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2710 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2712 rc = register_pernet_device(&vxlan_net_ops);
2716 rc = rtnl_link_register(&vxlan_link_ops);
2723 unregister_pernet_device(&vxlan_net_ops);
2725 destroy_workqueue(vxlan_wq);
2728 late_initcall(vxlan_init_module);
2730 static void __exit vxlan_cleanup_module(void)
2732 rtnl_link_unregister(&vxlan_link_ops);
2733 destroy_workqueue(vxlan_wq);
2734 unregister_pernet_device(&vxlan_net_ops);
2737 module_exit(vxlan_cleanup_module);
2739 MODULE_LICENSE("GPL");
2740 MODULE_VERSION(VXLAN_VERSION);
2741 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
2742 MODULE_ALIAS_RTNL_LINK("vxlan");