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/udp_tunnel.h>
37 #include <net/rtnetlink.h>
38 #include <net/route.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/vxlan.h>
44 #include <net/protocol.h>
45 #include <net/udp_tunnel.h>
46 #if IS_ENABLED(CONFIG_IPV6)
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/ip6_checksum.h>
53 #define VXLAN_VERSION "0.1"
55 #define PORT_HASH_BITS 8
56 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
57 #define VNI_HASH_BITS 10
58 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
59 #define FDB_HASH_BITS 8
60 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
61 #define FDB_AGE_DEFAULT 300 /* 5 min */
62 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
64 /* UDP port for VXLAN traffic.
65 * The IANA assigned port is 4789, but the Linux default is 8472
66 * for compatibility with early adopters.
68 static unsigned short vxlan_port __read_mostly = 8472;
69 module_param_named(udp_port, vxlan_port, ushort, 0444);
70 MODULE_PARM_DESC(udp_port, "Destination UDP port");
72 static bool log_ecn_error = true;
73 module_param(log_ecn_error, bool, 0644);
74 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
76 static int vxlan_net_id;
78 static const u8 all_zeros_mac[ETH_ALEN];
80 /* per-network namespace private data for this module */
82 struct list_head vxlan_list;
83 struct hlist_head sock_list[PORT_HASH_SIZE];
88 struct sockaddr_in sin;
89 struct sockaddr_in6 sin6;
94 union vxlan_addr remote_ip;
98 struct list_head list;
102 /* Forwarding table entry */
104 struct hlist_node hlist; /* linked list of entries */
106 unsigned long updated; /* jiffies */
108 struct list_head remotes;
109 u16 state; /* see ndm_state */
110 u8 flags; /* see ndm_flags */
111 u8 eth_addr[ETH_ALEN];
114 /* Pseudo network device */
116 struct hlist_node hlist; /* vni hash table */
117 struct list_head next; /* vxlan's per namespace list */
118 struct vxlan_sock *vn_sock; /* listening socket */
119 struct net_device *dev;
120 struct net *net; /* netns for packet i/o */
121 struct vxlan_rdst default_dst; /* default destination */
122 union vxlan_addr saddr; /* source address */
124 __u16 port_min; /* source port range */
126 __u8 tos; /* TOS override */
128 u32 flags; /* VXLAN_F_* in vxlan.h */
130 struct work_struct sock_work;
131 struct work_struct igmp_join;
132 struct work_struct igmp_leave;
134 unsigned long age_interval;
135 struct timer_list age_timer;
136 spinlock_t hash_lock;
137 unsigned int addrcnt;
138 unsigned int addrmax;
140 struct hlist_head fdb_head[FDB_HASH_SIZE];
143 /* salt for hash table */
144 static u32 vxlan_salt __read_mostly;
145 static struct workqueue_struct *vxlan_wq;
147 static void vxlan_sock_work(struct work_struct *work);
149 #if IS_ENABLED(CONFIG_IPV6)
151 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
153 if (a->sa.sa_family != b->sa.sa_family)
155 if (a->sa.sa_family == AF_INET6)
156 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
158 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
161 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
163 if (ipa->sa.sa_family == AF_INET6)
164 return ipv6_addr_any(&ipa->sin6.sin6_addr);
166 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
169 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
171 if (ipa->sa.sa_family == AF_INET6)
172 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
174 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
177 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
179 if (nla_len(nla) >= sizeof(struct in6_addr)) {
180 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
181 ip->sa.sa_family = AF_INET6;
183 } else if (nla_len(nla) >= sizeof(__be32)) {
184 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
185 ip->sa.sa_family = AF_INET;
188 return -EAFNOSUPPORT;
192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
193 const union vxlan_addr *ip)
195 if (ip->sa.sa_family == AF_INET6)
196 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
198 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
201 #else /* !CONFIG_IPV6 */
204 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
206 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
209 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
211 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
214 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
216 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
219 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
221 if (nla_len(nla) >= sizeof(struct in6_addr)) {
222 return -EAFNOSUPPORT;
223 } else if (nla_len(nla) >= sizeof(__be32)) {
224 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
225 ip->sa.sa_family = AF_INET;
228 return -EAFNOSUPPORT;
232 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
233 const union vxlan_addr *ip)
235 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
239 /* Virtual Network hash table head */
240 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
242 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
245 /* Socket hash table head */
246 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
248 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
250 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
253 /* First remote destination for a forwarding entry.
254 * Guaranteed to be non-NULL because remotes are never deleted.
256 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
258 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
261 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
263 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
266 /* Find VXLAN socket based on network namespace, address family and UDP port
267 * and enabled unshareable flags.
269 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
270 __be16 port, u32 flags)
272 struct vxlan_sock *vs;
273 u32 match_flags = flags & VXLAN_F_UNSHAREABLE;
275 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
276 if (inet_sk(vs->sock->sk)->inet_sport == port &&
277 inet_sk(vs->sock->sk)->sk.sk_family == family &&
278 (vs->flags & VXLAN_F_UNSHAREABLE) == match_flags)
284 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
286 struct vxlan_dev *vxlan;
288 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
289 if (vxlan->default_dst.remote_vni == id)
296 /* Look up VNI in a per net namespace table */
297 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
298 sa_family_t family, __be16 port,
301 struct vxlan_sock *vs;
303 vs = vxlan_find_sock(net, family, port, flags);
307 return vxlan_vs_find_vni(vs, id);
310 /* Fill in neighbour message in skbuff. */
311 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
312 const struct vxlan_fdb *fdb,
313 u32 portid, u32 seq, int type, unsigned int flags,
314 const struct vxlan_rdst *rdst)
316 unsigned long now = jiffies;
317 struct nda_cacheinfo ci;
318 struct nlmsghdr *nlh;
320 bool send_ip, send_eth;
322 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
326 ndm = nlmsg_data(nlh);
327 memset(ndm, 0, sizeof(*ndm));
329 send_eth = send_ip = true;
331 if (type == RTM_GETNEIGH) {
332 ndm->ndm_family = AF_INET;
333 send_ip = !vxlan_addr_any(&rdst->remote_ip);
334 send_eth = !is_zero_ether_addr(fdb->eth_addr);
336 ndm->ndm_family = AF_BRIDGE;
337 ndm->ndm_state = fdb->state;
338 ndm->ndm_ifindex = vxlan->dev->ifindex;
339 ndm->ndm_flags = fdb->flags;
340 ndm->ndm_type = RTN_UNICAST;
342 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
343 goto nla_put_failure;
345 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
346 goto nla_put_failure;
348 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
349 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
350 goto nla_put_failure;
351 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
352 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
353 goto nla_put_failure;
354 if (rdst->remote_ifindex &&
355 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
356 goto nla_put_failure;
358 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
359 ci.ndm_confirmed = 0;
360 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
363 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
364 goto nla_put_failure;
370 nlmsg_cancel(skb, nlh);
374 static inline size_t vxlan_nlmsg_size(void)
376 return NLMSG_ALIGN(sizeof(struct ndmsg))
377 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
378 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
379 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
380 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
381 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
382 + nla_total_size(sizeof(struct nda_cacheinfo));
385 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
386 struct vxlan_rdst *rd, int type)
388 struct net *net = dev_net(vxlan->dev);
392 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
396 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
398 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
399 WARN_ON(err == -EMSGSIZE);
404 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
408 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
411 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
413 struct vxlan_dev *vxlan = netdev_priv(dev);
414 struct vxlan_fdb f = {
417 struct vxlan_rdst remote = {
418 .remote_ip = *ipa, /* goes to NDA_DST */
419 .remote_vni = VXLAN_N_VID,
422 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
425 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
427 struct vxlan_fdb f = {
430 struct vxlan_rdst remote = { };
432 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
434 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
437 /* Hash Ethernet address */
438 static u32 eth_hash(const unsigned char *addr)
440 u64 value = get_unaligned((u64 *)addr);
442 /* only want 6 bytes */
448 return hash_64(value, FDB_HASH_BITS);
451 /* Hash chain to use given mac address */
452 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
455 return &vxlan->fdb_head[eth_hash(mac)];
458 /* Look up Ethernet address in forwarding table */
459 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
462 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
465 hlist_for_each_entry_rcu(f, head, hlist) {
466 if (ether_addr_equal(mac, f->eth_addr))
473 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
478 f = __vxlan_find_mac(vxlan, mac);
485 /* caller should hold vxlan->hash_lock */
486 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
487 union vxlan_addr *ip, __be16 port,
488 __u32 vni, __u32 ifindex)
490 struct vxlan_rdst *rd;
492 list_for_each_entry(rd, &f->remotes, list) {
493 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
494 rd->remote_port == port &&
495 rd->remote_vni == vni &&
496 rd->remote_ifindex == ifindex)
503 /* Replace destination of unicast mac */
504 static int vxlan_fdb_replace(struct vxlan_fdb *f,
505 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
507 struct vxlan_rdst *rd;
509 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
513 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
517 rd->remote_port = port;
518 rd->remote_vni = vni;
519 rd->remote_ifindex = ifindex;
523 /* Add/update destinations for multicast */
524 static int vxlan_fdb_append(struct vxlan_fdb *f,
525 union vxlan_addr *ip, __be16 port, __u32 vni,
526 __u32 ifindex, struct vxlan_rdst **rdp)
528 struct vxlan_rdst *rd;
530 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
534 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
538 rd->remote_port = port;
539 rd->remote_vni = vni;
540 rd->remote_ifindex = ifindex;
542 list_add_tail_rcu(&rd->list, &f->remotes);
548 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
550 struct vxlanhdr *vh, size_t hdrlen,
553 size_t start, offset, plen;
556 if (skb->remcsum_offload)
559 if (!NAPI_GRO_CB(skb)->csum_valid)
562 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
563 offset = start + ((data & VXLAN_RCO_UDP) ?
564 offsetof(struct udphdr, check) :
565 offsetof(struct tcphdr, check));
567 plen = hdrlen + offset + sizeof(u16);
569 /* Pull checksum that will be written */
570 if (skb_gro_header_hard(skb, off + plen)) {
571 vh = skb_gro_header_slow(skb, off + plen, off);
576 delta = remcsum_adjust((void *)vh + hdrlen,
577 NAPI_GRO_CB(skb)->csum, start, offset);
579 /* Adjust skb->csum since we changed the packet */
580 skb->csum = csum_add(skb->csum, delta);
581 NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta);
583 skb->remcsum_offload = 1;
588 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
590 struct udp_offload *uoff)
592 struct sk_buff *p, **pp = NULL;
593 struct vxlanhdr *vh, *vh2;
594 unsigned int hlen, off_vx;
596 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
600 off_vx = skb_gro_offset(skb);
601 hlen = off_vx + sizeof(*vh);
602 vh = skb_gro_header_fast(skb, off_vx);
603 if (skb_gro_header_hard(skb, hlen)) {
604 vh = skb_gro_header_slow(skb, hlen, off_vx);
609 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
610 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
612 flags = ntohl(vh->vx_flags);
614 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
615 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
624 for (p = *head; p; p = p->next) {
625 if (!NAPI_GRO_CB(p)->same_flow)
628 vh2 = (struct vxlanhdr *)(p->data + off_vx);
629 if (vh->vx_flags != vh2->vx_flags ||
630 vh->vx_vni != vh2->vx_vni) {
631 NAPI_GRO_CB(p)->same_flow = 0;
636 pp = eth_gro_receive(head, skb);
639 NAPI_GRO_CB(skb)->flush |= flush;
644 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
645 struct udp_offload *uoff)
647 udp_tunnel_gro_complete(skb, nhoff);
649 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
652 /* Notify netdevs that UDP port started listening */
653 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
655 struct net_device *dev;
656 struct sock *sk = vs->sock->sk;
657 struct net *net = sock_net(sk);
658 sa_family_t sa_family = sk->sk_family;
659 __be16 port = inet_sk(sk)->inet_sport;
662 if (sa_family == AF_INET) {
663 err = udp_add_offload(&vs->udp_offloads);
665 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
669 for_each_netdev_rcu(net, dev) {
670 if (dev->netdev_ops->ndo_add_vxlan_port)
671 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
677 /* Notify netdevs that UDP port is no more listening */
678 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
680 struct net_device *dev;
681 struct sock *sk = vs->sock->sk;
682 struct net *net = sock_net(sk);
683 sa_family_t sa_family = sk->sk_family;
684 __be16 port = inet_sk(sk)->inet_sport;
687 for_each_netdev_rcu(net, dev) {
688 if (dev->netdev_ops->ndo_del_vxlan_port)
689 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
694 if (sa_family == AF_INET)
695 udp_del_offload(&vs->udp_offloads);
698 /* Add new entry to forwarding table -- assumes lock held */
699 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
700 const u8 *mac, union vxlan_addr *ip,
701 __u16 state, __u16 flags,
702 __be16 port, __u32 vni, __u32 ifindex,
705 struct vxlan_rdst *rd = NULL;
709 f = __vxlan_find_mac(vxlan, mac);
711 if (flags & NLM_F_EXCL) {
712 netdev_dbg(vxlan->dev,
713 "lost race to create %pM\n", mac);
716 if (f->state != state) {
718 f->updated = jiffies;
721 if (f->flags != ndm_flags) {
722 f->flags = ndm_flags;
723 f->updated = jiffies;
726 if ((flags & NLM_F_REPLACE)) {
727 /* Only change unicasts */
728 if (!(is_multicast_ether_addr(f->eth_addr) ||
729 is_zero_ether_addr(f->eth_addr))) {
730 int rc = vxlan_fdb_replace(f, ip, port, vni,
739 if ((flags & NLM_F_APPEND) &&
740 (is_multicast_ether_addr(f->eth_addr) ||
741 is_zero_ether_addr(f->eth_addr))) {
742 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
750 if (!(flags & NLM_F_CREATE))
753 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
756 /* Disallow replace to add a multicast entry */
757 if ((flags & NLM_F_REPLACE) &&
758 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
761 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
762 f = kmalloc(sizeof(*f), GFP_ATOMIC);
768 f->flags = ndm_flags;
769 f->updated = f->used = jiffies;
770 INIT_LIST_HEAD(&f->remotes);
771 memcpy(f->eth_addr, mac, ETH_ALEN);
773 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
776 hlist_add_head_rcu(&f->hlist,
777 vxlan_fdb_head(vxlan, mac));
782 rd = first_remote_rtnl(f);
783 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
789 static void vxlan_fdb_free(struct rcu_head *head)
791 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
792 struct vxlan_rdst *rd, *nd;
794 list_for_each_entry_safe(rd, nd, &f->remotes, list)
799 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
801 netdev_dbg(vxlan->dev,
802 "delete %pM\n", f->eth_addr);
805 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
807 hlist_del_rcu(&f->hlist);
808 call_rcu(&f->rcu, vxlan_fdb_free);
811 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
812 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
814 struct net *net = dev_net(vxlan->dev);
818 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
822 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
823 if (remote->sa.sa_family == AF_INET) {
824 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
825 ip->sa.sa_family = AF_INET;
826 #if IS_ENABLED(CONFIG_IPV6)
828 ip->sin6.sin6_addr = in6addr_any;
829 ip->sa.sa_family = AF_INET6;
835 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
837 *port = nla_get_be16(tb[NDA_PORT]);
839 *port = vxlan->dst_port;
843 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
845 *vni = nla_get_u32(tb[NDA_VNI]);
847 *vni = vxlan->default_dst.remote_vni;
850 if (tb[NDA_IFINDEX]) {
851 struct net_device *tdev;
853 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
855 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
856 tdev = __dev_get_by_index(net, *ifindex);
858 return -EADDRNOTAVAIL;
866 /* Add static entry (via netlink) */
867 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
868 struct net_device *dev,
869 const unsigned char *addr, u16 vid, u16 flags)
871 struct vxlan_dev *vxlan = netdev_priv(dev);
872 /* struct net *net = dev_net(vxlan->dev); */
878 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
879 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
884 if (tb[NDA_DST] == NULL)
887 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
891 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
892 return -EAFNOSUPPORT;
894 spin_lock_bh(&vxlan->hash_lock);
895 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
896 port, vni, ifindex, ndm->ndm_flags);
897 spin_unlock_bh(&vxlan->hash_lock);
902 /* Delete entry (via netlink) */
903 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
904 struct net_device *dev,
905 const unsigned char *addr, u16 vid)
907 struct vxlan_dev *vxlan = netdev_priv(dev);
909 struct vxlan_rdst *rd = NULL;
915 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
921 spin_lock_bh(&vxlan->hash_lock);
922 f = vxlan_find_mac(vxlan, addr);
926 if (!vxlan_addr_any(&ip)) {
927 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
934 /* remove a destination if it's not the only one on the list,
935 * otherwise destroy the fdb entry
937 if (rd && !list_is_singular(&f->remotes)) {
938 list_del_rcu(&rd->list);
939 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
944 vxlan_fdb_destroy(vxlan, f);
947 spin_unlock_bh(&vxlan->hash_lock);
952 /* Dump forwarding table */
953 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
954 struct net_device *dev,
955 struct net_device *filter_dev, int idx)
957 struct vxlan_dev *vxlan = netdev_priv(dev);
960 for (h = 0; h < FDB_HASH_SIZE; ++h) {
964 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
965 struct vxlan_rdst *rd;
967 if (idx < cb->args[0])
970 list_for_each_entry_rcu(rd, &f->remotes, list) {
971 err = vxlan_fdb_info(skb, vxlan, f,
972 NETLINK_CB(cb->skb).portid,
987 /* Watch incoming packets to learn mapping between Ethernet address
988 * and Tunnel endpoint.
989 * Return true if packet is bogus and should be droppped.
991 static bool vxlan_snoop(struct net_device *dev,
992 union vxlan_addr *src_ip, const u8 *src_mac)
994 struct vxlan_dev *vxlan = netdev_priv(dev);
997 f = vxlan_find_mac(vxlan, src_mac);
999 struct vxlan_rdst *rdst = first_remote_rcu(f);
1001 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
1004 /* Don't migrate static entries, drop packets */
1005 if (f->state & NUD_NOARP)
1008 if (net_ratelimit())
1010 "%pM migrated from %pIS to %pIS\n",
1011 src_mac, &rdst->remote_ip, &src_ip);
1013 rdst->remote_ip = *src_ip;
1014 f->updated = jiffies;
1015 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1017 /* learned new entry */
1018 spin_lock(&vxlan->hash_lock);
1020 /* close off race between vxlan_flush and incoming packets */
1021 if (netif_running(dev))
1022 vxlan_fdb_create(vxlan, src_mac, src_ip,
1024 NLM_F_EXCL|NLM_F_CREATE,
1026 vxlan->default_dst.remote_vni,
1028 spin_unlock(&vxlan->hash_lock);
1034 /* See if multicast group is already in use by other ID */
1035 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1037 struct vxlan_dev *vxlan;
1039 /* The vxlan_sock is only used by dev, leaving group has
1040 * no effect on other vxlan devices.
1042 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1045 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1046 if (!netif_running(vxlan->dev) || vxlan == dev)
1049 if (vxlan->vn_sock != dev->vn_sock)
1052 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1053 &dev->default_dst.remote_ip))
1056 if (vxlan->default_dst.remote_ifindex !=
1057 dev->default_dst.remote_ifindex)
1066 static void vxlan_sock_hold(struct vxlan_sock *vs)
1068 atomic_inc(&vs->refcnt);
1071 void vxlan_sock_release(struct vxlan_sock *vs)
1073 struct sock *sk = vs->sock->sk;
1074 struct net *net = sock_net(sk);
1075 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1077 if (!atomic_dec_and_test(&vs->refcnt))
1080 spin_lock(&vn->sock_lock);
1081 hlist_del_rcu(&vs->hlist);
1082 vxlan_notify_del_rx_port(vs);
1083 spin_unlock(&vn->sock_lock);
1085 queue_work(vxlan_wq, &vs->del_work);
1087 EXPORT_SYMBOL_GPL(vxlan_sock_release);
1089 /* Callback to update multicast group membership when first VNI on
1090 * multicast asddress is brought up
1091 * Done as workqueue because ip_mc_join_group acquires RTNL.
1093 static void vxlan_igmp_join(struct work_struct *work)
1095 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
1096 struct vxlan_sock *vs = vxlan->vn_sock;
1097 struct sock *sk = vs->sock->sk;
1098 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1099 int ifindex = vxlan->default_dst.remote_ifindex;
1102 if (ip->sa.sa_family == AF_INET) {
1103 struct ip_mreqn mreq = {
1104 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1105 .imr_ifindex = ifindex,
1108 ip_mc_join_group(sk, &mreq);
1109 #if IS_ENABLED(CONFIG_IPV6)
1111 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1112 &ip->sin6.sin6_addr);
1117 vxlan_sock_release(vs);
1118 dev_put(vxlan->dev);
1121 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1122 static void vxlan_igmp_leave(struct work_struct *work)
1124 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
1125 struct vxlan_sock *vs = vxlan->vn_sock;
1126 struct sock *sk = vs->sock->sk;
1127 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1128 int ifindex = vxlan->default_dst.remote_ifindex;
1131 if (ip->sa.sa_family == AF_INET) {
1132 struct ip_mreqn mreq = {
1133 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1134 .imr_ifindex = ifindex,
1137 ip_mc_leave_group(sk, &mreq);
1138 #if IS_ENABLED(CONFIG_IPV6)
1140 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1141 &ip->sin6.sin6_addr);
1147 vxlan_sock_release(vs);
1148 dev_put(vxlan->dev);
1151 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1152 size_t hdrlen, u32 data)
1154 size_t start, offset, plen;
1157 if (skb->remcsum_offload) {
1158 /* Already processed in GRO path */
1159 skb->remcsum_offload = 0;
1163 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1164 offset = start + ((data & VXLAN_RCO_UDP) ?
1165 offsetof(struct udphdr, check) :
1166 offsetof(struct tcphdr, check));
1168 plen = hdrlen + offset + sizeof(u16);
1170 if (!pskb_may_pull(skb, plen))
1173 vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1175 if (unlikely(skb->ip_summed != CHECKSUM_COMPLETE))
1176 __skb_checksum_complete(skb);
1178 delta = remcsum_adjust((void *)vh + hdrlen,
1179 skb->csum, start, offset);
1181 /* Adjust skb->csum since we changed the packet */
1182 skb->csum = csum_add(skb->csum, delta);
1187 /* Callback from net/ipv4/udp.c to receive packets */
1188 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1190 struct vxlan_sock *vs;
1191 struct vxlanhdr *vxh;
1193 struct vxlan_metadata md = {0};
1195 /* Need Vxlan and inner Ethernet header to be present */
1196 if (!pskb_may_pull(skb, VXLAN_HLEN))
1199 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1200 flags = ntohl(vxh->vx_flags);
1201 vni = ntohl(vxh->vx_vni);
1203 if (flags & VXLAN_HF_VNI) {
1204 flags &= ~VXLAN_HF_VNI;
1206 /* VNI flag always required to be set */
1210 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1212 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1214 vs = rcu_dereference_sk_user_data(sk);
1218 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1219 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni);
1223 flags &= ~VXLAN_HF_RCO;
1224 vni &= VXLAN_VID_MASK;
1227 /* For backwards compatibility, only allow reserved fields to be
1228 * used by VXLAN extensions if explicitly requested.
1230 if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1231 struct vxlanhdr_gbp *gbp;
1233 gbp = (struct vxlanhdr_gbp *)vxh;
1234 md.gbp = ntohs(gbp->policy_id);
1236 if (gbp->dont_learn)
1237 md.gbp |= VXLAN_GBP_DONT_LEARN;
1239 if (gbp->policy_applied)
1240 md.gbp |= VXLAN_GBP_POLICY_APPLIED;
1242 flags &= ~VXLAN_GBP_USED_BITS;
1245 if (flags || (vni & ~VXLAN_VID_MASK)) {
1246 /* If there are any unprocessed flags remaining treat
1247 * this as a malformed packet. This behavior diverges from
1248 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1249 * in reserved fields are to be ignored. The approach here
1250 * maintains compatbility with previous stack code, and also
1251 * is more robust and provides a little more security in
1252 * adding extensions to VXLAN.
1258 md.vni = vxh->vx_vni;
1259 vs->rcv(vs, skb, &md);
1263 /* Consume bad packet */
1268 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1269 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1272 /* Return non vxlan pkt */
1276 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1277 struct vxlan_metadata *md)
1279 struct iphdr *oip = NULL;
1280 struct ipv6hdr *oip6 = NULL;
1281 struct vxlan_dev *vxlan;
1282 struct pcpu_sw_netstats *stats;
1283 union vxlan_addr saddr;
1286 union vxlan_addr *remote_ip;
1288 vni = ntohl(md->vni) >> 8;
1289 /* Is this VNI defined? */
1290 vxlan = vxlan_vs_find_vni(vs, vni);
1294 remote_ip = &vxlan->default_dst.remote_ip;
1295 skb_reset_mac_header(skb);
1296 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1297 skb->protocol = eth_type_trans(skb, vxlan->dev);
1298 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1300 /* Ignore packet loops (and multicast echo) */
1301 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1304 /* Re-examine inner Ethernet packet */
1305 if (remote_ip->sa.sa_family == AF_INET) {
1307 saddr.sin.sin_addr.s_addr = oip->saddr;
1308 saddr.sa.sa_family = AF_INET;
1309 #if IS_ENABLED(CONFIG_IPV6)
1311 oip6 = ipv6_hdr(skb);
1312 saddr.sin6.sin6_addr = oip6->saddr;
1313 saddr.sa.sa_family = AF_INET6;
1317 if ((vxlan->flags & VXLAN_F_LEARN) &&
1318 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1321 skb_reset_network_header(skb);
1322 skb->mark = md->gbp;
1325 err = IP6_ECN_decapsulate(oip6, skb);
1327 err = IP_ECN_decapsulate(oip, skb);
1329 if (unlikely(err)) {
1330 if (log_ecn_error) {
1332 net_info_ratelimited("non-ECT from %pI6\n",
1335 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1336 &oip->saddr, oip->tos);
1339 ++vxlan->dev->stats.rx_frame_errors;
1340 ++vxlan->dev->stats.rx_errors;
1345 stats = this_cpu_ptr(vxlan->dev->tstats);
1346 u64_stats_update_begin(&stats->syncp);
1347 stats->rx_packets++;
1348 stats->rx_bytes += skb->len;
1349 u64_stats_update_end(&stats->syncp);
1355 /* Consume bad packet */
1359 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1361 struct vxlan_dev *vxlan = netdev_priv(dev);
1362 struct arphdr *parp;
1365 struct neighbour *n;
1367 if (dev->flags & IFF_NOARP)
1370 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1371 dev->stats.tx_dropped++;
1374 parp = arp_hdr(skb);
1376 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1377 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1378 parp->ar_pro != htons(ETH_P_IP) ||
1379 parp->ar_op != htons(ARPOP_REQUEST) ||
1380 parp->ar_hln != dev->addr_len ||
1383 arpptr = (u8 *)parp + sizeof(struct arphdr);
1385 arpptr += dev->addr_len; /* sha */
1386 memcpy(&sip, arpptr, sizeof(sip));
1387 arpptr += sizeof(sip);
1388 arpptr += dev->addr_len; /* tha */
1389 memcpy(&tip, arpptr, sizeof(tip));
1391 if (ipv4_is_loopback(tip) ||
1392 ipv4_is_multicast(tip))
1395 n = neigh_lookup(&arp_tbl, &tip, dev);
1398 struct vxlan_fdb *f;
1399 struct sk_buff *reply;
1401 if (!(n->nud_state & NUD_CONNECTED)) {
1406 f = vxlan_find_mac(vxlan, n->ha);
1407 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1408 /* bridge-local neighbor */
1413 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1421 skb_reset_mac_header(reply);
1422 __skb_pull(reply, skb_network_offset(reply));
1423 reply->ip_summed = CHECKSUM_UNNECESSARY;
1424 reply->pkt_type = PACKET_HOST;
1426 if (netif_rx_ni(reply) == NET_RX_DROP)
1427 dev->stats.rx_dropped++;
1428 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1429 union vxlan_addr ipa = {
1430 .sin.sin_addr.s_addr = tip,
1431 .sin.sin_family = AF_INET,
1434 vxlan_ip_miss(dev, &ipa);
1438 return NETDEV_TX_OK;
1441 #if IS_ENABLED(CONFIG_IPV6)
1442 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1443 struct neighbour *n, bool isrouter)
1445 struct net_device *dev = request->dev;
1446 struct sk_buff *reply;
1447 struct nd_msg *ns, *na;
1448 struct ipv6hdr *pip6;
1450 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1457 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1458 sizeof(*na) + na_olen + dev->needed_tailroom;
1459 reply = alloc_skb(len, GFP_ATOMIC);
1463 reply->protocol = htons(ETH_P_IPV6);
1465 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1466 skb_push(reply, sizeof(struct ethhdr));
1467 skb_set_mac_header(reply, 0);
1469 ns = (struct nd_msg *)skb_transport_header(request);
1471 daddr = eth_hdr(request)->h_source;
1472 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1473 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1474 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1475 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1480 /* Ethernet header */
1481 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1482 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1483 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1484 reply->protocol = htons(ETH_P_IPV6);
1486 skb_pull(reply, sizeof(struct ethhdr));
1487 skb_set_network_header(reply, 0);
1488 skb_put(reply, sizeof(struct ipv6hdr));
1492 pip6 = ipv6_hdr(reply);
1493 memset(pip6, 0, sizeof(struct ipv6hdr));
1495 pip6->priority = ipv6_hdr(request)->priority;
1496 pip6->nexthdr = IPPROTO_ICMPV6;
1497 pip6->hop_limit = 255;
1498 pip6->daddr = ipv6_hdr(request)->saddr;
1499 pip6->saddr = *(struct in6_addr *)n->primary_key;
1501 skb_pull(reply, sizeof(struct ipv6hdr));
1502 skb_set_transport_header(reply, 0);
1504 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1506 /* Neighbor Advertisement */
1507 memset(na, 0, sizeof(*na)+na_olen);
1508 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1509 na->icmph.icmp6_router = isrouter;
1510 na->icmph.icmp6_override = 1;
1511 na->icmph.icmp6_solicited = 1;
1512 na->target = ns->target;
1513 ether_addr_copy(&na->opt[2], n->ha);
1514 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1515 na->opt[1] = na_olen >> 3;
1517 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1518 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1519 csum_partial(na, sizeof(*na)+na_olen, 0));
1521 pip6->payload_len = htons(sizeof(*na)+na_olen);
1523 skb_push(reply, sizeof(struct ipv6hdr));
1525 reply->ip_summed = CHECKSUM_UNNECESSARY;
1530 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1532 struct vxlan_dev *vxlan = netdev_priv(dev);
1534 const struct ipv6hdr *iphdr;
1535 const struct in6_addr *saddr, *daddr;
1536 struct neighbour *n;
1537 struct inet6_dev *in6_dev;
1539 in6_dev = __in6_dev_get(dev);
1543 iphdr = ipv6_hdr(skb);
1544 saddr = &iphdr->saddr;
1545 daddr = &iphdr->daddr;
1547 msg = (struct nd_msg *)skb_transport_header(skb);
1548 if (msg->icmph.icmp6_code != 0 ||
1549 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1552 if (ipv6_addr_loopback(daddr) ||
1553 ipv6_addr_is_multicast(&msg->target))
1556 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1559 struct vxlan_fdb *f;
1560 struct sk_buff *reply;
1562 if (!(n->nud_state & NUD_CONNECTED)) {
1567 f = vxlan_find_mac(vxlan, n->ha);
1568 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1569 /* bridge-local neighbor */
1574 reply = vxlan_na_create(skb, n,
1575 !!(f ? f->flags & NTF_ROUTER : 0));
1582 if (netif_rx_ni(reply) == NET_RX_DROP)
1583 dev->stats.rx_dropped++;
1585 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1586 union vxlan_addr ipa = {
1587 .sin6.sin6_addr = msg->target,
1588 .sin6.sin6_family = AF_INET6,
1591 vxlan_ip_miss(dev, &ipa);
1596 return NETDEV_TX_OK;
1600 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1602 struct vxlan_dev *vxlan = netdev_priv(dev);
1603 struct neighbour *n;
1605 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1609 switch (ntohs(eth_hdr(skb)->h_proto)) {
1614 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1617 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1618 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1619 union vxlan_addr ipa = {
1620 .sin.sin_addr.s_addr = pip->daddr,
1621 .sin.sin_family = AF_INET,
1624 vxlan_ip_miss(dev, &ipa);
1630 #if IS_ENABLED(CONFIG_IPV6)
1633 struct ipv6hdr *pip6;
1635 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1637 pip6 = ipv6_hdr(skb);
1638 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1639 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1640 union vxlan_addr ipa = {
1641 .sin6.sin6_addr = pip6->daddr,
1642 .sin6.sin6_family = AF_INET6,
1645 vxlan_ip_miss(dev, &ipa);
1659 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1661 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1663 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1672 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, struct vxlan_sock *vs,
1673 struct vxlan_metadata *md)
1675 struct vxlanhdr_gbp *gbp;
1677 gbp = (struct vxlanhdr_gbp *)vxh;
1678 vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1680 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1681 gbp->dont_learn = 1;
1683 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1684 gbp->policy_applied = 1;
1686 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1689 #if IS_ENABLED(CONFIG_IPV6)
1690 static int vxlan6_xmit_skb(struct vxlan_sock *vs,
1691 struct dst_entry *dst, struct sk_buff *skb,
1692 struct net_device *dev, struct in6_addr *saddr,
1693 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1694 __be16 src_port, __be16 dst_port,
1695 struct vxlan_metadata *md, bool xnet)
1697 struct vxlanhdr *vxh;
1700 bool udp_sum = !udp_get_no_check6_tx(vs->sock->sk);
1701 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1702 u16 hdrlen = sizeof(struct vxlanhdr);
1704 if ((vs->flags & VXLAN_F_REMCSUM_TX) &&
1705 skb->ip_summed == CHECKSUM_PARTIAL) {
1706 int csum_start = skb_checksum_start_offset(skb);
1708 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1709 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1710 (skb->csum_offset == offsetof(struct udphdr, check) ||
1711 skb->csum_offset == offsetof(struct tcphdr, check))) {
1713 type |= SKB_GSO_TUNNEL_REMCSUM;
1717 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1723 skb_scrub_packet(skb, xnet);
1725 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1726 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1727 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1729 /* Need space for new headers (invalidates iph ptr) */
1730 err = skb_cow_head(skb, min_headroom);
1731 if (unlikely(err)) {
1736 skb = vlan_hwaccel_push_inside(skb);
1737 if (WARN_ON(!skb)) {
1742 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1743 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1744 vxh->vx_vni = md->vni;
1746 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1747 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1750 if (skb->csum_offset == offsetof(struct udphdr, check))
1751 data |= VXLAN_RCO_UDP;
1753 vxh->vx_vni |= htonl(data);
1754 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1756 if (!skb_is_gso(skb)) {
1757 skb->ip_summed = CHECKSUM_NONE;
1758 skb->encapsulation = 0;
1762 if (vs->flags & VXLAN_F_GBP)
1763 vxlan_build_gbp_hdr(vxh, vs, md);
1765 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1767 udp_tunnel6_xmit_skb(vs->sock, dst, skb, dev, saddr, daddr, prio,
1768 ttl, src_port, dst_port);
1776 int vxlan_xmit_skb(struct vxlan_sock *vs,
1777 struct rtable *rt, struct sk_buff *skb,
1778 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1779 __be16 src_port, __be16 dst_port,
1780 struct vxlan_metadata *md, bool xnet)
1782 struct vxlanhdr *vxh;
1785 bool udp_sum = !vs->sock->sk->sk_no_check_tx;
1786 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1787 u16 hdrlen = sizeof(struct vxlanhdr);
1789 if ((vs->flags & VXLAN_F_REMCSUM_TX) &&
1790 skb->ip_summed == CHECKSUM_PARTIAL) {
1791 int csum_start = skb_checksum_start_offset(skb);
1793 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1794 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1795 (skb->csum_offset == offsetof(struct udphdr, check) ||
1796 skb->csum_offset == offsetof(struct tcphdr, check))) {
1798 type |= SKB_GSO_TUNNEL_REMCSUM;
1802 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1804 return PTR_ERR(skb);
1806 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1807 + VXLAN_HLEN + sizeof(struct iphdr)
1808 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1810 /* Need space for new headers (invalidates iph ptr) */
1811 err = skb_cow_head(skb, min_headroom);
1812 if (unlikely(err)) {
1817 skb = vlan_hwaccel_push_inside(skb);
1821 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1822 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1823 vxh->vx_vni = md->vni;
1825 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1826 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1829 if (skb->csum_offset == offsetof(struct udphdr, check))
1830 data |= VXLAN_RCO_UDP;
1832 vxh->vx_vni |= htonl(data);
1833 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1835 if (!skb_is_gso(skb)) {
1836 skb->ip_summed = CHECKSUM_NONE;
1837 skb->encapsulation = 0;
1841 if (vs->flags & VXLAN_F_GBP)
1842 vxlan_build_gbp_hdr(vxh, vs, md);
1844 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1846 return udp_tunnel_xmit_skb(vs->sock, rt, skb, src, dst, tos,
1847 ttl, df, src_port, dst_port, xnet);
1849 EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1851 /* Bypass encapsulation if the destination is local */
1852 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1853 struct vxlan_dev *dst_vxlan)
1855 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1856 union vxlan_addr loopback;
1857 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1858 struct net_device *dev = skb->dev;
1861 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1862 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1863 skb->pkt_type = PACKET_HOST;
1864 skb->encapsulation = 0;
1865 skb->dev = dst_vxlan->dev;
1866 __skb_pull(skb, skb_network_offset(skb));
1868 if (remote_ip->sa.sa_family == AF_INET) {
1869 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1870 loopback.sa.sa_family = AF_INET;
1871 #if IS_ENABLED(CONFIG_IPV6)
1873 loopback.sin6.sin6_addr = in6addr_loopback;
1874 loopback.sa.sa_family = AF_INET6;
1878 if (dst_vxlan->flags & VXLAN_F_LEARN)
1879 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1881 u64_stats_update_begin(&tx_stats->syncp);
1882 tx_stats->tx_packets++;
1883 tx_stats->tx_bytes += len;
1884 u64_stats_update_end(&tx_stats->syncp);
1886 if (netif_rx(skb) == NET_RX_SUCCESS) {
1887 u64_stats_update_begin(&rx_stats->syncp);
1888 rx_stats->rx_packets++;
1889 rx_stats->rx_bytes += len;
1890 u64_stats_update_end(&rx_stats->syncp);
1892 dev->stats.rx_dropped++;
1896 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1897 struct vxlan_rdst *rdst, bool did_rsc)
1899 struct vxlan_dev *vxlan = netdev_priv(dev);
1900 struct rtable *rt = NULL;
1901 const struct iphdr *old_iph;
1903 union vxlan_addr *dst;
1904 struct vxlan_metadata md;
1905 __be16 src_port = 0, dst_port;
1911 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1912 vni = rdst->remote_vni;
1913 dst = &rdst->remote_ip;
1915 if (vxlan_addr_any(dst)) {
1917 /* short-circuited back to local bridge */
1918 vxlan_encap_bypass(skb, vxlan, vxlan);
1924 old_iph = ip_hdr(skb);
1927 if (!ttl && vxlan_addr_multicast(dst))
1932 tos = ip_tunnel_get_dsfield(old_iph, skb);
1934 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1935 vxlan->port_max, true);
1937 if (dst->sa.sa_family == AF_INET) {
1938 memset(&fl4, 0, sizeof(fl4));
1939 fl4.flowi4_oif = rdst->remote_ifindex;
1940 fl4.flowi4_tos = RT_TOS(tos);
1941 fl4.daddr = dst->sin.sin_addr.s_addr;
1942 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1944 rt = ip_route_output_key(vxlan->net, &fl4);
1946 netdev_dbg(dev, "no route to %pI4\n",
1947 &dst->sin.sin_addr.s_addr);
1948 dev->stats.tx_carrier_errors++;
1952 if (rt->dst.dev == dev) {
1953 netdev_dbg(dev, "circular route to %pI4\n",
1954 &dst->sin.sin_addr.s_addr);
1955 dev->stats.collisions++;
1959 /* Bypass encapsulation if the destination is local */
1960 if (rt->rt_flags & RTCF_LOCAL &&
1961 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1962 struct vxlan_dev *dst_vxlan;
1965 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1966 dst->sa.sa_family, dst_port,
1970 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1974 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1975 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1976 md.vni = htonl(vni << 8);
1979 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1980 fl4.saddr, dst->sin.sin_addr.s_addr,
1981 tos, ttl, df, src_port, dst_port, &md,
1982 !net_eq(vxlan->net, dev_net(vxlan->dev)));
1984 /* skb is already freed. */
1989 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1990 #if IS_ENABLED(CONFIG_IPV6)
1992 struct sock *sk = vxlan->vn_sock->sock->sk;
1993 struct dst_entry *ndst;
1997 memset(&fl6, 0, sizeof(fl6));
1998 fl6.flowi6_oif = rdst->remote_ifindex;
1999 fl6.daddr = dst->sin6.sin6_addr;
2000 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
2001 fl6.flowi6_proto = IPPROTO_UDP;
2003 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
2004 netdev_dbg(dev, "no route to %pI6\n",
2005 &dst->sin6.sin6_addr);
2006 dev->stats.tx_carrier_errors++;
2010 if (ndst->dev == dev) {
2011 netdev_dbg(dev, "circular route to %pI6\n",
2012 &dst->sin6.sin6_addr);
2014 dev->stats.collisions++;
2018 /* Bypass encapsulation if the destination is local */
2019 flags = ((struct rt6_info *)ndst)->rt6i_flags;
2020 if (flags & RTF_LOCAL &&
2021 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2022 struct vxlan_dev *dst_vxlan;
2025 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2026 dst->sa.sa_family, dst_port,
2030 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2034 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2035 md.vni = htonl(vni << 8);
2038 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
2039 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
2040 src_port, dst_port, &md,
2041 !net_eq(vxlan->net, dev_net(vxlan->dev)));
2048 dev->stats.tx_dropped++;
2054 dev->stats.tx_errors++;
2059 /* Transmit local packets over Vxlan
2061 * Outer IP header inherits ECN and DF from inner header.
2062 * Outer UDP destination is the VXLAN assigned port.
2063 * source port is based on hash of flow
2065 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2067 struct vxlan_dev *vxlan = netdev_priv(dev);
2069 bool did_rsc = false;
2070 struct vxlan_rdst *rdst, *fdst = NULL;
2071 struct vxlan_fdb *f;
2073 skb_reset_mac_header(skb);
2076 if ((vxlan->flags & VXLAN_F_PROXY)) {
2077 if (ntohs(eth->h_proto) == ETH_P_ARP)
2078 return arp_reduce(dev, skb);
2079 #if IS_ENABLED(CONFIG_IPV6)
2080 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2081 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2082 + sizeof(struct nd_msg)) &&
2083 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2086 msg = (struct nd_msg *)skb_transport_header(skb);
2087 if (msg->icmph.icmp6_code == 0 &&
2088 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2089 return neigh_reduce(dev, skb);
2095 f = vxlan_find_mac(vxlan, eth->h_dest);
2098 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2099 (ntohs(eth->h_proto) == ETH_P_IP ||
2100 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2101 did_rsc = route_shortcircuit(dev, skb);
2103 f = vxlan_find_mac(vxlan, eth->h_dest);
2107 f = vxlan_find_mac(vxlan, all_zeros_mac);
2109 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2110 !is_multicast_ether_addr(eth->h_dest))
2111 vxlan_fdb_miss(vxlan, eth->h_dest);
2113 dev->stats.tx_dropped++;
2115 return NETDEV_TX_OK;
2119 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2120 struct sk_buff *skb1;
2126 skb1 = skb_clone(skb, GFP_ATOMIC);
2128 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2132 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2135 return NETDEV_TX_OK;
2138 /* Walk the forwarding table and purge stale entries */
2139 static void vxlan_cleanup(unsigned long arg)
2141 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2142 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2145 if (!netif_running(vxlan->dev))
2148 spin_lock_bh(&vxlan->hash_lock);
2149 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2150 struct hlist_node *p, *n;
2151 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2153 = container_of(p, struct vxlan_fdb, hlist);
2154 unsigned long timeout;
2156 if (f->state & NUD_PERMANENT)
2159 timeout = f->used + vxlan->age_interval * HZ;
2160 if (time_before_eq(timeout, jiffies)) {
2161 netdev_dbg(vxlan->dev,
2162 "garbage collect %pM\n",
2164 f->state = NUD_STALE;
2165 vxlan_fdb_destroy(vxlan, f);
2166 } else if (time_before(timeout, next_timer))
2167 next_timer = timeout;
2170 spin_unlock_bh(&vxlan->hash_lock);
2172 mod_timer(&vxlan->age_timer, next_timer);
2175 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2177 __u32 vni = vxlan->default_dst.remote_vni;
2179 vxlan->vn_sock = vs;
2180 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2183 /* Setup stats when device is created */
2184 static int vxlan_init(struct net_device *dev)
2186 struct vxlan_dev *vxlan = netdev_priv(dev);
2187 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2188 struct vxlan_sock *vs;
2189 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2191 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2195 spin_lock(&vn->sock_lock);
2196 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2197 vxlan->dst_port, vxlan->flags);
2198 if (vs && atomic_add_unless(&vs->refcnt, 1, 0)) {
2199 /* If we have a socket with same port already, reuse it */
2200 vxlan_vs_add_dev(vs, vxlan);
2202 /* otherwise make new socket outside of RTNL */
2204 queue_work(vxlan_wq, &vxlan->sock_work);
2206 spin_unlock(&vn->sock_lock);
2211 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2213 struct vxlan_fdb *f;
2215 spin_lock_bh(&vxlan->hash_lock);
2216 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2218 vxlan_fdb_destroy(vxlan, f);
2219 spin_unlock_bh(&vxlan->hash_lock);
2222 static void vxlan_uninit(struct net_device *dev)
2224 struct vxlan_dev *vxlan = netdev_priv(dev);
2225 struct vxlan_sock *vs = vxlan->vn_sock;
2227 vxlan_fdb_delete_default(vxlan);
2230 vxlan_sock_release(vs);
2231 free_percpu(dev->tstats);
2234 /* Start ageing timer and join group when device is brought up */
2235 static int vxlan_open(struct net_device *dev)
2237 struct vxlan_dev *vxlan = netdev_priv(dev);
2238 struct vxlan_sock *vs = vxlan->vn_sock;
2240 /* socket hasn't been created */
2244 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2245 vxlan_sock_hold(vs);
2247 queue_work(vxlan_wq, &vxlan->igmp_join);
2250 if (vxlan->age_interval)
2251 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2256 /* Purge the forwarding table */
2257 static void vxlan_flush(struct vxlan_dev *vxlan)
2261 spin_lock_bh(&vxlan->hash_lock);
2262 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2263 struct hlist_node *p, *n;
2264 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2266 = container_of(p, struct vxlan_fdb, hlist);
2267 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2268 if (!is_zero_ether_addr(f->eth_addr))
2269 vxlan_fdb_destroy(vxlan, f);
2272 spin_unlock_bh(&vxlan->hash_lock);
2275 /* Cleanup timer and forwarding table on shutdown */
2276 static int vxlan_stop(struct net_device *dev)
2278 struct vxlan_dev *vxlan = netdev_priv(dev);
2279 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2280 struct vxlan_sock *vs = vxlan->vn_sock;
2282 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2283 !vxlan_group_used(vn, vxlan)) {
2284 vxlan_sock_hold(vs);
2286 queue_work(vxlan_wq, &vxlan->igmp_leave);
2289 del_timer_sync(&vxlan->age_timer);
2296 /* Stub, nothing needs to be done. */
2297 static void vxlan_set_multicast_list(struct net_device *dev)
2301 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2303 struct vxlan_dev *vxlan = netdev_priv(dev);
2304 struct vxlan_rdst *dst = &vxlan->default_dst;
2305 struct net_device *lowerdev;
2308 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2309 if (lowerdev == NULL)
2310 return eth_change_mtu(dev, new_mtu);
2312 if (dst->remote_ip.sa.sa_family == AF_INET6)
2313 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2315 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2317 if (new_mtu < 68 || new_mtu > max_mtu)
2324 static const struct net_device_ops vxlan_netdev_ops = {
2325 .ndo_init = vxlan_init,
2326 .ndo_uninit = vxlan_uninit,
2327 .ndo_open = vxlan_open,
2328 .ndo_stop = vxlan_stop,
2329 .ndo_start_xmit = vxlan_xmit,
2330 .ndo_get_stats64 = ip_tunnel_get_stats64,
2331 .ndo_set_rx_mode = vxlan_set_multicast_list,
2332 .ndo_change_mtu = vxlan_change_mtu,
2333 .ndo_validate_addr = eth_validate_addr,
2334 .ndo_set_mac_address = eth_mac_addr,
2335 .ndo_fdb_add = vxlan_fdb_add,
2336 .ndo_fdb_del = vxlan_fdb_delete,
2337 .ndo_fdb_dump = vxlan_fdb_dump,
2340 /* Info for udev, that this is a virtual tunnel endpoint */
2341 static struct device_type vxlan_type = {
2345 /* Calls the ndo_add_vxlan_port of the caller in order to
2346 * supply the listening VXLAN udp ports. Callers are expected
2347 * to implement the ndo_add_vxlan_port.
2349 void vxlan_get_rx_port(struct net_device *dev)
2351 struct vxlan_sock *vs;
2352 struct net *net = dev_net(dev);
2353 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2354 sa_family_t sa_family;
2358 spin_lock(&vn->sock_lock);
2359 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2360 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2361 port = inet_sk(vs->sock->sk)->inet_sport;
2362 sa_family = vs->sock->sk->sk_family;
2363 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2367 spin_unlock(&vn->sock_lock);
2369 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2371 /* Initialize the device structure. */
2372 static void vxlan_setup(struct net_device *dev)
2374 struct vxlan_dev *vxlan = netdev_priv(dev);
2377 eth_hw_addr_random(dev);
2379 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2380 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2382 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2384 dev->netdev_ops = &vxlan_netdev_ops;
2385 dev->destructor = free_netdev;
2386 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2388 dev->tx_queue_len = 0;
2389 dev->features |= NETIF_F_LLTX;
2390 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2391 dev->features |= NETIF_F_RXCSUM;
2392 dev->features |= NETIF_F_GSO_SOFTWARE;
2394 dev->vlan_features = dev->features;
2395 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2396 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2397 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2398 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2399 netif_keep_dst(dev);
2400 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2402 INIT_LIST_HEAD(&vxlan->next);
2403 spin_lock_init(&vxlan->hash_lock);
2404 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2405 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
2406 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
2408 init_timer_deferrable(&vxlan->age_timer);
2409 vxlan->age_timer.function = vxlan_cleanup;
2410 vxlan->age_timer.data = (unsigned long) vxlan;
2412 vxlan->dst_port = htons(vxlan_port);
2416 for (h = 0; h < FDB_HASH_SIZE; ++h)
2417 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2420 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2421 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2422 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2423 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2424 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2425 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2426 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2427 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2428 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2429 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2430 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2431 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2432 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2433 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2434 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2435 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2436 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2437 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2438 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2439 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2440 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2441 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2442 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2443 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2446 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2448 if (tb[IFLA_ADDRESS]) {
2449 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2450 pr_debug("invalid link address (not ethernet)\n");
2454 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2455 pr_debug("invalid all zero ethernet address\n");
2456 return -EADDRNOTAVAIL;
2463 if (data[IFLA_VXLAN_ID]) {
2464 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2465 if (id >= VXLAN_VID_MASK)
2469 if (data[IFLA_VXLAN_PORT_RANGE]) {
2470 const struct ifla_vxlan_port_range *p
2471 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2473 if (ntohs(p->high) < ntohs(p->low)) {
2474 pr_debug("port range %u .. %u not valid\n",
2475 ntohs(p->low), ntohs(p->high));
2483 static void vxlan_get_drvinfo(struct net_device *netdev,
2484 struct ethtool_drvinfo *drvinfo)
2486 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2487 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2490 static const struct ethtool_ops vxlan_ethtool_ops = {
2491 .get_drvinfo = vxlan_get_drvinfo,
2492 .get_link = ethtool_op_get_link,
2495 static void vxlan_del_work(struct work_struct *work)
2497 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2498 udp_tunnel_sock_release(vs->sock);
2502 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2503 __be16 port, u32 flags)
2505 struct socket *sock;
2506 struct udp_port_cfg udp_conf;
2509 memset(&udp_conf, 0, sizeof(udp_conf));
2512 udp_conf.family = AF_INET6;
2513 udp_conf.use_udp6_tx_checksums =
2514 !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2515 udp_conf.use_udp6_rx_checksums =
2516 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2518 udp_conf.family = AF_INET;
2519 udp_conf.local_ip.s_addr = INADDR_ANY;
2520 udp_conf.use_udp_checksums =
2521 !!(flags & VXLAN_F_UDP_CSUM);
2524 udp_conf.local_udp_port = port;
2526 /* Open UDP socket */
2527 err = udp_sock_create(net, &udp_conf, &sock);
2529 return ERR_PTR(err);
2534 /* Create new listen socket if needed */
2535 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2536 vxlan_rcv_t *rcv, void *data,
2539 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2540 struct vxlan_sock *vs;
2541 struct socket *sock;
2543 bool ipv6 = !!(flags & VXLAN_F_IPV6);
2544 struct udp_tunnel_sock_cfg tunnel_cfg;
2546 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2548 return ERR_PTR(-ENOMEM);
2550 for (h = 0; h < VNI_HASH_SIZE; ++h)
2551 INIT_HLIST_HEAD(&vs->vni_list[h]);
2553 INIT_WORK(&vs->del_work, vxlan_del_work);
2555 sock = vxlan_create_sock(net, ipv6, port, flags);
2558 return ERR_CAST(sock);
2562 atomic_set(&vs->refcnt, 1);
2567 /* Initialize the vxlan udp offloads structure */
2568 vs->udp_offloads.port = port;
2569 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2570 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2572 spin_lock(&vn->sock_lock);
2573 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2574 vxlan_notify_add_rx_port(vs);
2575 spin_unlock(&vn->sock_lock);
2577 /* Mark socket as an encapsulation socket. */
2578 tunnel_cfg.sk_user_data = vs;
2579 tunnel_cfg.encap_type = 1;
2580 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2581 tunnel_cfg.encap_destroy = NULL;
2583 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2588 struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2589 vxlan_rcv_t *rcv, void *data,
2590 bool no_share, u32 flags)
2592 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2593 struct vxlan_sock *vs;
2594 bool ipv6 = flags & VXLAN_F_IPV6;
2596 vs = vxlan_socket_create(net, port, rcv, data, flags);
2600 if (no_share) /* Return error if sharing is not allowed. */
2603 spin_lock(&vn->sock_lock);
2604 vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port, flags);
2605 if (vs && ((vs->rcv != rcv) ||
2606 !atomic_add_unless(&vs->refcnt, 1, 0)))
2607 vs = ERR_PTR(-EBUSY);
2608 spin_unlock(&vn->sock_lock);
2611 vs = ERR_PTR(-EINVAL);
2615 EXPORT_SYMBOL_GPL(vxlan_sock_add);
2617 /* Scheduled at device creation to bind to a socket */
2618 static void vxlan_sock_work(struct work_struct *work)
2620 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2621 struct net *net = vxlan->net;
2622 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2623 __be16 port = vxlan->dst_port;
2624 struct vxlan_sock *nvs;
2626 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
2627 spin_lock(&vn->sock_lock);
2629 vxlan_vs_add_dev(nvs, vxlan);
2630 spin_unlock(&vn->sock_lock);
2632 dev_put(vxlan->dev);
2635 static int vxlan_newlink(struct net *net, struct net_device *dev,
2636 struct nlattr *tb[], struct nlattr *data[])
2638 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2639 struct vxlan_dev *vxlan = netdev_priv(dev);
2640 struct vxlan_rdst *dst = &vxlan->default_dst;
2643 bool use_ipv6 = false;
2645 if (!data[IFLA_VXLAN_ID])
2648 vxlan->net = dev_net(dev);
2650 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2651 dst->remote_vni = vni;
2653 /* Unless IPv6 is explicitly requested, assume IPv4 */
2654 dst->remote_ip.sa.sa_family = AF_INET;
2655 if (data[IFLA_VXLAN_GROUP]) {
2656 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2657 } else if (data[IFLA_VXLAN_GROUP6]) {
2658 if (!IS_ENABLED(CONFIG_IPV6))
2659 return -EPFNOSUPPORT;
2661 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2662 sizeof(struct in6_addr));
2663 dst->remote_ip.sa.sa_family = AF_INET6;
2667 if (data[IFLA_VXLAN_LOCAL]) {
2668 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2669 vxlan->saddr.sa.sa_family = AF_INET;
2670 } else if (data[IFLA_VXLAN_LOCAL6]) {
2671 if (!IS_ENABLED(CONFIG_IPV6))
2672 return -EPFNOSUPPORT;
2674 /* TODO: respect scope id */
2675 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2676 sizeof(struct in6_addr));
2677 vxlan->saddr.sa.sa_family = AF_INET6;
2681 if (data[IFLA_VXLAN_LINK] &&
2682 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2683 struct net_device *lowerdev
2684 = __dev_get_by_index(net, dst->remote_ifindex);
2687 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2691 #if IS_ENABLED(CONFIG_IPV6)
2693 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2694 if (idev && idev->cnf.disable_ipv6) {
2695 pr_info("IPv6 is disabled via sysctl\n");
2698 vxlan->flags |= VXLAN_F_IPV6;
2703 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2705 dev->needed_headroom = lowerdev->hard_header_len +
2706 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2707 } else if (use_ipv6)
2708 vxlan->flags |= VXLAN_F_IPV6;
2710 if (data[IFLA_VXLAN_TOS])
2711 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2713 if (data[IFLA_VXLAN_TTL])
2714 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2716 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2717 vxlan->flags |= VXLAN_F_LEARN;
2719 if (data[IFLA_VXLAN_AGEING])
2720 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2722 vxlan->age_interval = FDB_AGE_DEFAULT;
2724 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2725 vxlan->flags |= VXLAN_F_PROXY;
2727 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2728 vxlan->flags |= VXLAN_F_RSC;
2730 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2731 vxlan->flags |= VXLAN_F_L2MISS;
2733 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2734 vxlan->flags |= VXLAN_F_L3MISS;
2736 if (data[IFLA_VXLAN_LIMIT])
2737 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2739 if (data[IFLA_VXLAN_PORT_RANGE]) {
2740 const struct ifla_vxlan_port_range *p
2741 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2742 vxlan->port_min = ntohs(p->low);
2743 vxlan->port_max = ntohs(p->high);
2746 if (data[IFLA_VXLAN_PORT])
2747 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2749 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2750 vxlan->flags |= VXLAN_F_UDP_CSUM;
2752 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2753 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2754 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2756 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2757 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2758 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2760 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2761 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2762 vxlan->flags |= VXLAN_F_REMCSUM_TX;
2764 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2765 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2766 vxlan->flags |= VXLAN_F_REMCSUM_RX;
2768 if (data[IFLA_VXLAN_GBP])
2769 vxlan->flags |= VXLAN_F_GBP;
2771 if (vxlan_find_vni(net, vni, use_ipv6 ? AF_INET6 : AF_INET,
2772 vxlan->dst_port, vxlan->flags)) {
2773 pr_info("duplicate VNI %u\n", vni);
2777 dev->ethtool_ops = &vxlan_ethtool_ops;
2779 /* create an fdb entry for a valid default destination */
2780 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2781 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2782 &vxlan->default_dst.remote_ip,
2783 NUD_REACHABLE|NUD_PERMANENT,
2784 NLM_F_EXCL|NLM_F_CREATE,
2786 vxlan->default_dst.remote_vni,
2787 vxlan->default_dst.remote_ifindex,
2793 err = register_netdevice(dev);
2795 vxlan_fdb_delete_default(vxlan);
2799 list_add(&vxlan->next, &vn->vxlan_list);
2804 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2806 struct vxlan_dev *vxlan = netdev_priv(dev);
2807 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2809 spin_lock(&vn->sock_lock);
2810 if (!hlist_unhashed(&vxlan->hlist))
2811 hlist_del_rcu(&vxlan->hlist);
2812 spin_unlock(&vn->sock_lock);
2814 list_del(&vxlan->next);
2815 unregister_netdevice_queue(dev, head);
2818 static size_t vxlan_get_size(const struct net_device *dev)
2821 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2822 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2823 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2824 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2825 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2826 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2827 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2828 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2829 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2830 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2831 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2832 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2833 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2834 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2835 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2836 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2837 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2838 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2839 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2840 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2844 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2846 const struct vxlan_dev *vxlan = netdev_priv(dev);
2847 const struct vxlan_rdst *dst = &vxlan->default_dst;
2848 struct ifla_vxlan_port_range ports = {
2849 .low = htons(vxlan->port_min),
2850 .high = htons(vxlan->port_max),
2853 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2854 goto nla_put_failure;
2856 if (!vxlan_addr_any(&dst->remote_ip)) {
2857 if (dst->remote_ip.sa.sa_family == AF_INET) {
2858 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2859 dst->remote_ip.sin.sin_addr.s_addr))
2860 goto nla_put_failure;
2861 #if IS_ENABLED(CONFIG_IPV6)
2863 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2864 &dst->remote_ip.sin6.sin6_addr))
2865 goto nla_put_failure;
2870 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2871 goto nla_put_failure;
2873 if (!vxlan_addr_any(&vxlan->saddr)) {
2874 if (vxlan->saddr.sa.sa_family == AF_INET) {
2875 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2876 vxlan->saddr.sin.sin_addr.s_addr))
2877 goto nla_put_failure;
2878 #if IS_ENABLED(CONFIG_IPV6)
2880 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2881 &vxlan->saddr.sin6.sin6_addr))
2882 goto nla_put_failure;
2887 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2888 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2889 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2890 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2891 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2892 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2893 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2894 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2895 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2896 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2897 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2898 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2899 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2900 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2901 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2902 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2903 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2904 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2905 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2906 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
2907 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
2908 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
2909 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
2910 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
2911 goto nla_put_failure;
2913 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2914 goto nla_put_failure;
2916 if (vxlan->flags & VXLAN_F_GBP &&
2917 nla_put_flag(skb, IFLA_VXLAN_GBP))
2918 goto nla_put_failure;
2926 static struct net *vxlan_get_link_net(const struct net_device *dev)
2928 struct vxlan_dev *vxlan = netdev_priv(dev);
2933 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2935 .maxtype = IFLA_VXLAN_MAX,
2936 .policy = vxlan_policy,
2937 .priv_size = sizeof(struct vxlan_dev),
2938 .setup = vxlan_setup,
2939 .validate = vxlan_validate,
2940 .newlink = vxlan_newlink,
2941 .dellink = vxlan_dellink,
2942 .get_size = vxlan_get_size,
2943 .fill_info = vxlan_fill_info,
2944 .get_link_net = vxlan_get_link_net,
2947 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2948 struct net_device *dev)
2950 struct vxlan_dev *vxlan, *next;
2951 LIST_HEAD(list_kill);
2953 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2954 struct vxlan_rdst *dst = &vxlan->default_dst;
2956 /* In case we created vxlan device with carrier
2957 * and we loose the carrier due to module unload
2958 * we also need to remove vxlan device. In other
2959 * cases, it's not necessary and remote_ifindex
2960 * is 0 here, so no matches.
2962 if (dst->remote_ifindex == dev->ifindex)
2963 vxlan_dellink(vxlan->dev, &list_kill);
2966 unregister_netdevice_many(&list_kill);
2969 static int vxlan_lowerdev_event(struct notifier_block *unused,
2970 unsigned long event, void *ptr)
2972 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2973 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2975 if (event == NETDEV_UNREGISTER)
2976 vxlan_handle_lowerdev_unregister(vn, dev);
2981 static struct notifier_block vxlan_notifier_block __read_mostly = {
2982 .notifier_call = vxlan_lowerdev_event,
2985 static __net_init int vxlan_init_net(struct net *net)
2987 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2990 INIT_LIST_HEAD(&vn->vxlan_list);
2991 spin_lock_init(&vn->sock_lock);
2993 for (h = 0; h < PORT_HASH_SIZE; ++h)
2994 INIT_HLIST_HEAD(&vn->sock_list[h]);
2999 static void __net_exit vxlan_exit_net(struct net *net)
3001 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3002 struct vxlan_dev *vxlan, *next;
3003 struct net_device *dev, *aux;
3007 for_each_netdev_safe(net, dev, aux)
3008 if (dev->rtnl_link_ops == &vxlan_link_ops)
3009 unregister_netdevice_queue(dev, &list);
3011 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3012 /* If vxlan->dev is in the same netns, it has already been added
3013 * to the list by the previous loop.
3015 if (!net_eq(dev_net(vxlan->dev), net))
3016 unregister_netdevice_queue(dev, &list);
3019 unregister_netdevice_many(&list);
3023 static struct pernet_operations vxlan_net_ops = {
3024 .init = vxlan_init_net,
3025 .exit = vxlan_exit_net,
3026 .id = &vxlan_net_id,
3027 .size = sizeof(struct vxlan_net),
3030 static int __init vxlan_init_module(void)
3034 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3038 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3040 rc = register_pernet_subsys(&vxlan_net_ops);
3044 rc = register_netdevice_notifier(&vxlan_notifier_block);
3048 rc = rtnl_link_register(&vxlan_link_ops);
3054 unregister_netdevice_notifier(&vxlan_notifier_block);
3056 unregister_pernet_subsys(&vxlan_net_ops);
3058 destroy_workqueue(vxlan_wq);
3061 late_initcall(vxlan_init_module);
3063 static void __exit vxlan_cleanup_module(void)
3065 rtnl_link_unregister(&vxlan_link_ops);
3066 unregister_netdevice_notifier(&vxlan_notifier_block);
3067 destroy_workqueue(vxlan_wq);
3068 unregister_pernet_subsys(&vxlan_net_ops);
3069 /* rcu_barrier() is called by netns */
3071 module_exit(vxlan_cleanup_module);
3073 MODULE_LICENSE("GPL");
3074 MODULE_VERSION(VXLAN_VERSION);
3075 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3076 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3077 MODULE_ALIAS_RTNL_LINK("vxlan");