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>
52 #include <net/dst_metadata.h>
54 #define VXLAN_VERSION "0.1"
56 #define PORT_HASH_BITS 8
57 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
58 #define FDB_AGE_DEFAULT 300 /* 5 min */
59 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
61 /* UDP port for VXLAN traffic.
62 * The IANA assigned port is 4789, but the Linux default is 8472
63 * for compatibility with early adopters.
65 static unsigned short vxlan_port __read_mostly = 8472;
66 module_param_named(udp_port, vxlan_port, ushort, 0444);
67 MODULE_PARM_DESC(udp_port, "Destination UDP port");
69 static bool log_ecn_error = true;
70 module_param(log_ecn_error, bool, 0644);
71 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
73 static int vxlan_net_id;
74 static struct rtnl_link_ops vxlan_link_ops;
76 static const u8 all_zeros_mac[ETH_ALEN];
78 static struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
79 bool no_share, u32 flags);
81 /* per-network namespace private data for this module */
83 struct list_head vxlan_list;
84 struct hlist_head sock_list[PORT_HASH_SIZE];
88 /* Forwarding table entry */
90 struct hlist_node hlist; /* linked list of entries */
92 unsigned long updated; /* jiffies */
94 struct list_head remotes;
95 u8 eth_addr[ETH_ALEN];
96 u16 state; /* see ndm_state */
97 u8 flags; /* see ndm_flags */
100 /* salt for hash table */
101 static u32 vxlan_salt __read_mostly;
102 static struct workqueue_struct *vxlan_wq;
104 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
106 return vs->flags & VXLAN_F_COLLECT_METADATA ||
107 ip_tunnel_collect_metadata();
110 #if IS_ENABLED(CONFIG_IPV6)
112 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
114 if (a->sa.sa_family != b->sa.sa_family)
116 if (a->sa.sa_family == AF_INET6)
117 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
119 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
122 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
124 if (ipa->sa.sa_family == AF_INET6)
125 return ipv6_addr_any(&ipa->sin6.sin6_addr);
127 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
130 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
132 if (ipa->sa.sa_family == AF_INET6)
133 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
135 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
138 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
140 if (nla_len(nla) >= sizeof(struct in6_addr)) {
141 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
142 ip->sa.sa_family = AF_INET6;
144 } else if (nla_len(nla) >= sizeof(__be32)) {
145 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
146 ip->sa.sa_family = AF_INET;
149 return -EAFNOSUPPORT;
153 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
154 const union vxlan_addr *ip)
156 if (ip->sa.sa_family == AF_INET6)
157 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
159 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
162 #else /* !CONFIG_IPV6 */
165 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
167 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
170 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
172 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
175 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
177 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
180 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
182 if (nla_len(nla) >= sizeof(struct in6_addr)) {
183 return -EAFNOSUPPORT;
184 } else if (nla_len(nla) >= sizeof(__be32)) {
185 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
186 ip->sa.sa_family = AF_INET;
189 return -EAFNOSUPPORT;
193 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
194 const union vxlan_addr *ip)
196 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
200 /* Virtual Network hash table head */
201 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
203 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
206 /* Socket hash table head */
207 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
209 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
211 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
214 /* First remote destination for a forwarding entry.
215 * Guaranteed to be non-NULL because remotes are never deleted.
217 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
219 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
222 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
224 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
227 /* Find VXLAN socket based on network namespace, address family and UDP port
228 * and enabled unshareable flags.
230 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
231 __be16 port, u32 flags)
233 struct vxlan_sock *vs;
235 flags &= VXLAN_F_RCV_FLAGS;
237 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
238 if (inet_sk(vs->sock->sk)->inet_sport == port &&
239 vxlan_get_sk_family(vs) == family &&
246 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
248 struct vxlan_dev *vxlan;
250 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
251 if (vxlan->default_dst.remote_vni == id)
258 /* Look up VNI in a per net namespace table */
259 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
260 sa_family_t family, __be16 port,
263 struct vxlan_sock *vs;
265 vs = vxlan_find_sock(net, family, port, flags);
269 return vxlan_vs_find_vni(vs, id);
272 /* Fill in neighbour message in skbuff. */
273 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
274 const struct vxlan_fdb *fdb,
275 u32 portid, u32 seq, int type, unsigned int flags,
276 const struct vxlan_rdst *rdst)
278 unsigned long now = jiffies;
279 struct nda_cacheinfo ci;
280 struct nlmsghdr *nlh;
282 bool send_ip, send_eth;
284 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
288 ndm = nlmsg_data(nlh);
289 memset(ndm, 0, sizeof(*ndm));
291 send_eth = send_ip = true;
293 if (type == RTM_GETNEIGH) {
294 ndm->ndm_family = AF_INET;
295 send_ip = !vxlan_addr_any(&rdst->remote_ip);
296 send_eth = !is_zero_ether_addr(fdb->eth_addr);
298 ndm->ndm_family = AF_BRIDGE;
299 ndm->ndm_state = fdb->state;
300 ndm->ndm_ifindex = vxlan->dev->ifindex;
301 ndm->ndm_flags = fdb->flags;
302 ndm->ndm_type = RTN_UNICAST;
304 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
305 nla_put_s32(skb, NDA_LINK_NETNSID,
306 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
307 goto nla_put_failure;
309 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
310 goto nla_put_failure;
312 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
313 goto nla_put_failure;
315 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
316 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
317 goto nla_put_failure;
318 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
319 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
320 goto nla_put_failure;
321 if (rdst->remote_ifindex &&
322 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
323 goto nla_put_failure;
325 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
326 ci.ndm_confirmed = 0;
327 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
330 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
331 goto nla_put_failure;
337 nlmsg_cancel(skb, nlh);
341 static inline size_t vxlan_nlmsg_size(void)
343 return NLMSG_ALIGN(sizeof(struct ndmsg))
344 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
345 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
346 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
347 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
348 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
349 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
350 + nla_total_size(sizeof(struct nda_cacheinfo));
353 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
354 struct vxlan_rdst *rd, int type)
356 struct net *net = dev_net(vxlan->dev);
360 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
364 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
366 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
367 WARN_ON(err == -EMSGSIZE);
372 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
376 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
379 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
381 struct vxlan_dev *vxlan = netdev_priv(dev);
382 struct vxlan_fdb f = {
385 struct vxlan_rdst remote = {
386 .remote_ip = *ipa, /* goes to NDA_DST */
387 .remote_vni = VXLAN_N_VID,
390 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
393 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
395 struct vxlan_fdb f = {
398 struct vxlan_rdst remote = { };
400 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
402 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
405 /* Hash Ethernet address */
406 static u32 eth_hash(const unsigned char *addr)
408 u64 value = get_unaligned((u64 *)addr);
410 /* only want 6 bytes */
416 return hash_64(value, FDB_HASH_BITS);
419 /* Hash chain to use given mac address */
420 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
423 return &vxlan->fdb_head[eth_hash(mac)];
426 /* Look up Ethernet address in forwarding table */
427 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
430 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
433 hlist_for_each_entry_rcu(f, head, hlist) {
434 if (ether_addr_equal(mac, f->eth_addr))
441 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
446 f = __vxlan_find_mac(vxlan, mac);
453 /* caller should hold vxlan->hash_lock */
454 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
455 union vxlan_addr *ip, __be16 port,
456 __u32 vni, __u32 ifindex)
458 struct vxlan_rdst *rd;
460 list_for_each_entry(rd, &f->remotes, list) {
461 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
462 rd->remote_port == port &&
463 rd->remote_vni == vni &&
464 rd->remote_ifindex == ifindex)
471 /* Replace destination of unicast mac */
472 static int vxlan_fdb_replace(struct vxlan_fdb *f,
473 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
475 struct vxlan_rdst *rd;
477 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
481 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
485 rd->remote_port = port;
486 rd->remote_vni = vni;
487 rd->remote_ifindex = ifindex;
491 /* Add/update destinations for multicast */
492 static int vxlan_fdb_append(struct vxlan_fdb *f,
493 union vxlan_addr *ip, __be16 port, __u32 vni,
494 __u32 ifindex, struct vxlan_rdst **rdp)
496 struct vxlan_rdst *rd;
498 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
502 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
506 rd->remote_port = port;
507 rd->remote_vni = vni;
508 rd->remote_ifindex = ifindex;
510 list_add_tail_rcu(&rd->list, &f->remotes);
516 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
518 struct vxlanhdr *vh, size_t hdrlen,
519 u32 data, struct gro_remcsum *grc,
522 size_t start, offset;
524 if (skb->remcsum_offload)
527 if (!NAPI_GRO_CB(skb)->csum_valid)
530 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
531 offset = start + ((data & VXLAN_RCO_UDP) ?
532 offsetof(struct udphdr, check) :
533 offsetof(struct tcphdr, check));
535 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
536 start, offset, grc, nopartial);
538 skb->remcsum_offload = 1;
543 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
545 struct udp_offload *uoff)
547 struct sk_buff *p, **pp = NULL;
548 struct vxlanhdr *vh, *vh2;
549 unsigned int hlen, off_vx;
551 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
554 struct gro_remcsum grc;
556 skb_gro_remcsum_init(&grc);
558 off_vx = skb_gro_offset(skb);
559 hlen = off_vx + sizeof(*vh);
560 vh = skb_gro_header_fast(skb, off_vx);
561 if (skb_gro_header_hard(skb, hlen)) {
562 vh = skb_gro_header_slow(skb, hlen, off_vx);
567 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
569 flags = ntohl(vh->vx_flags);
571 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
572 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
573 ntohl(vh->vx_vni), &grc,
575 VXLAN_F_REMCSUM_NOPARTIAL));
581 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
585 for (p = *head; p; p = p->next) {
586 if (!NAPI_GRO_CB(p)->same_flow)
589 vh2 = (struct vxlanhdr *)(p->data + off_vx);
590 if (vh->vx_flags != vh2->vx_flags ||
591 vh->vx_vni != vh2->vx_vni) {
592 NAPI_GRO_CB(p)->same_flow = 0;
597 pp = eth_gro_receive(head, skb);
600 skb_gro_remcsum_cleanup(skb, &grc);
601 NAPI_GRO_CB(skb)->flush |= flush;
606 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
607 struct udp_offload *uoff)
609 udp_tunnel_gro_complete(skb, nhoff);
611 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
614 /* Notify netdevs that UDP port started listening */
615 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
617 struct net_device *dev;
618 struct sock *sk = vs->sock->sk;
619 struct net *net = sock_net(sk);
620 sa_family_t sa_family = vxlan_get_sk_family(vs);
621 __be16 port = inet_sk(sk)->inet_sport;
624 if (sa_family == AF_INET) {
625 err = udp_add_offload(&vs->udp_offloads);
627 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
631 for_each_netdev_rcu(net, dev) {
632 if (dev->netdev_ops->ndo_add_vxlan_port)
633 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
639 /* Notify netdevs that UDP port is no more listening */
640 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
642 struct net_device *dev;
643 struct sock *sk = vs->sock->sk;
644 struct net *net = sock_net(sk);
645 sa_family_t sa_family = vxlan_get_sk_family(vs);
646 __be16 port = inet_sk(sk)->inet_sport;
649 for_each_netdev_rcu(net, dev) {
650 if (dev->netdev_ops->ndo_del_vxlan_port)
651 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
656 if (sa_family == AF_INET)
657 udp_del_offload(&vs->udp_offloads);
660 /* Add new entry to forwarding table -- assumes lock held */
661 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
662 const u8 *mac, union vxlan_addr *ip,
663 __u16 state, __u16 flags,
664 __be16 port, __u32 vni, __u32 ifindex,
667 struct vxlan_rdst *rd = NULL;
671 f = __vxlan_find_mac(vxlan, mac);
673 if (flags & NLM_F_EXCL) {
674 netdev_dbg(vxlan->dev,
675 "lost race to create %pM\n", mac);
678 if (f->state != state) {
680 f->updated = jiffies;
683 if (f->flags != ndm_flags) {
684 f->flags = ndm_flags;
685 f->updated = jiffies;
688 if ((flags & NLM_F_REPLACE)) {
689 /* Only change unicasts */
690 if (!(is_multicast_ether_addr(f->eth_addr) ||
691 is_zero_ether_addr(f->eth_addr))) {
692 notify |= vxlan_fdb_replace(f, ip, port, vni,
697 if ((flags & NLM_F_APPEND) &&
698 (is_multicast_ether_addr(f->eth_addr) ||
699 is_zero_ether_addr(f->eth_addr))) {
700 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
708 if (!(flags & NLM_F_CREATE))
711 if (vxlan->cfg.addrmax &&
712 vxlan->addrcnt >= vxlan->cfg.addrmax)
715 /* Disallow replace to add a multicast entry */
716 if ((flags & NLM_F_REPLACE) &&
717 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
720 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
721 f = kmalloc(sizeof(*f), GFP_ATOMIC);
727 f->flags = ndm_flags;
728 f->updated = f->used = jiffies;
729 INIT_LIST_HEAD(&f->remotes);
730 memcpy(f->eth_addr, mac, ETH_ALEN);
732 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
735 hlist_add_head_rcu(&f->hlist,
736 vxlan_fdb_head(vxlan, mac));
741 rd = first_remote_rtnl(f);
742 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
748 static void vxlan_fdb_free(struct rcu_head *head)
750 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
751 struct vxlan_rdst *rd, *nd;
753 list_for_each_entry_safe(rd, nd, &f->remotes, list)
758 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
760 netdev_dbg(vxlan->dev,
761 "delete %pM\n", f->eth_addr);
764 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
766 hlist_del_rcu(&f->hlist);
767 call_rcu(&f->rcu, vxlan_fdb_free);
770 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
771 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
773 struct net *net = dev_net(vxlan->dev);
777 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
781 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
782 if (remote->sa.sa_family == AF_INET) {
783 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
784 ip->sa.sa_family = AF_INET;
785 #if IS_ENABLED(CONFIG_IPV6)
787 ip->sin6.sin6_addr = in6addr_any;
788 ip->sa.sa_family = AF_INET6;
794 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
796 *port = nla_get_be16(tb[NDA_PORT]);
798 *port = vxlan->cfg.dst_port;
802 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
804 *vni = nla_get_u32(tb[NDA_VNI]);
806 *vni = vxlan->default_dst.remote_vni;
809 if (tb[NDA_IFINDEX]) {
810 struct net_device *tdev;
812 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
814 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
815 tdev = __dev_get_by_index(net, *ifindex);
817 return -EADDRNOTAVAIL;
825 /* Add static entry (via netlink) */
826 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
827 struct net_device *dev,
828 const unsigned char *addr, u16 vid, u16 flags)
830 struct vxlan_dev *vxlan = netdev_priv(dev);
831 /* struct net *net = dev_net(vxlan->dev); */
837 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
838 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
843 if (tb[NDA_DST] == NULL)
846 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
850 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
851 return -EAFNOSUPPORT;
853 spin_lock_bh(&vxlan->hash_lock);
854 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
855 port, vni, ifindex, ndm->ndm_flags);
856 spin_unlock_bh(&vxlan->hash_lock);
861 /* Delete entry (via netlink) */
862 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
863 struct net_device *dev,
864 const unsigned char *addr, u16 vid)
866 struct vxlan_dev *vxlan = netdev_priv(dev);
868 struct vxlan_rdst *rd = NULL;
874 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
880 spin_lock_bh(&vxlan->hash_lock);
881 f = vxlan_find_mac(vxlan, addr);
885 if (!vxlan_addr_any(&ip)) {
886 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
893 /* remove a destination if it's not the only one on the list,
894 * otherwise destroy the fdb entry
896 if (rd && !list_is_singular(&f->remotes)) {
897 list_del_rcu(&rd->list);
898 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
903 vxlan_fdb_destroy(vxlan, f);
906 spin_unlock_bh(&vxlan->hash_lock);
911 /* Dump forwarding table */
912 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
913 struct net_device *dev,
914 struct net_device *filter_dev, int idx)
916 struct vxlan_dev *vxlan = netdev_priv(dev);
919 for (h = 0; h < FDB_HASH_SIZE; ++h) {
923 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
924 struct vxlan_rdst *rd;
926 list_for_each_entry_rcu(rd, &f->remotes, list) {
927 if (idx < cb->args[0])
930 err = vxlan_fdb_info(skb, vxlan, f,
931 NETLINK_CB(cb->skb).portid,
946 /* Watch incoming packets to learn mapping between Ethernet address
947 * and Tunnel endpoint.
948 * Return true if packet is bogus and should be dropped.
950 static bool vxlan_snoop(struct net_device *dev,
951 union vxlan_addr *src_ip, const u8 *src_mac)
953 struct vxlan_dev *vxlan = netdev_priv(dev);
956 f = vxlan_find_mac(vxlan, src_mac);
958 struct vxlan_rdst *rdst = first_remote_rcu(f);
960 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
963 /* Don't migrate static entries, drop packets */
964 if (f->state & NUD_NOARP)
969 "%pM migrated from %pIS to %pIS\n",
970 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
972 rdst->remote_ip = *src_ip;
973 f->updated = jiffies;
974 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
976 /* learned new entry */
977 spin_lock(&vxlan->hash_lock);
979 /* close off race between vxlan_flush and incoming packets */
980 if (netif_running(dev))
981 vxlan_fdb_create(vxlan, src_mac, src_ip,
983 NLM_F_EXCL|NLM_F_CREATE,
985 vxlan->default_dst.remote_vni,
987 spin_unlock(&vxlan->hash_lock);
993 /* See if multicast group is already in use by other ID */
994 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
996 struct vxlan_dev *vxlan;
998 /* The vxlan_sock is only used by dev, leaving group has
999 * no effect on other vxlan devices.
1001 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1004 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1005 if (!netif_running(vxlan->dev) || vxlan == dev)
1008 if (vxlan->vn_sock != dev->vn_sock)
1011 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1012 &dev->default_dst.remote_ip))
1015 if (vxlan->default_dst.remote_ifindex !=
1016 dev->default_dst.remote_ifindex)
1025 static void vxlan_sock_release(struct vxlan_sock *vs)
1027 struct sock *sk = vs->sock->sk;
1028 struct net *net = sock_net(sk);
1029 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1031 if (!atomic_dec_and_test(&vs->refcnt))
1034 spin_lock(&vn->sock_lock);
1035 hlist_del_rcu(&vs->hlist);
1036 vxlan_notify_del_rx_port(vs);
1037 spin_unlock(&vn->sock_lock);
1039 queue_work(vxlan_wq, &vs->del_work);
1042 /* Update multicast group membership when first VNI on
1043 * multicast address is brought up
1045 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1047 struct vxlan_sock *vs = vxlan->vn_sock;
1048 struct sock *sk = vs->sock->sk;
1049 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1050 int ifindex = vxlan->default_dst.remote_ifindex;
1054 if (ip->sa.sa_family == AF_INET) {
1055 struct ip_mreqn mreq = {
1056 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1057 .imr_ifindex = ifindex,
1060 ret = ip_mc_join_group(sk, &mreq);
1061 #if IS_ENABLED(CONFIG_IPV6)
1063 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1064 &ip->sin6.sin6_addr);
1072 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1073 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1075 struct vxlan_sock *vs = vxlan->vn_sock;
1076 struct sock *sk = vs->sock->sk;
1077 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1078 int ifindex = vxlan->default_dst.remote_ifindex;
1082 if (ip->sa.sa_family == AF_INET) {
1083 struct ip_mreqn mreq = {
1084 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1085 .imr_ifindex = ifindex,
1088 ret = ip_mc_leave_group(sk, &mreq);
1089 #if IS_ENABLED(CONFIG_IPV6)
1091 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1092 &ip->sin6.sin6_addr);
1100 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1101 size_t hdrlen, u32 data, bool nopartial)
1103 size_t start, offset, plen;
1105 if (skb->remcsum_offload)
1108 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1109 offset = start + ((data & VXLAN_RCO_UDP) ?
1110 offsetof(struct udphdr, check) :
1111 offsetof(struct tcphdr, check));
1113 plen = hdrlen + offset + sizeof(u16);
1115 if (!pskb_may_pull(skb, plen))
1118 vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1120 skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1126 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1127 struct vxlan_metadata *md, u32 vni,
1128 struct metadata_dst *tun_dst)
1130 struct iphdr *oip = NULL;
1131 struct ipv6hdr *oip6 = NULL;
1132 struct vxlan_dev *vxlan;
1133 struct pcpu_sw_netstats *stats;
1134 union vxlan_addr saddr;
1136 union vxlan_addr *remote_ip;
1138 /* For flow based devices, map all packets to VNI 0 */
1139 if (vs->flags & VXLAN_F_COLLECT_METADATA)
1142 /* Is this VNI defined? */
1143 vxlan = vxlan_vs_find_vni(vs, vni);
1147 remote_ip = &vxlan->default_dst.remote_ip;
1148 skb_reset_mac_header(skb);
1149 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1150 skb->protocol = eth_type_trans(skb, vxlan->dev);
1151 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1153 /* Ignore packet loops (and multicast echo) */
1154 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1157 /* Re-examine inner Ethernet packet */
1158 if (remote_ip->sa.sa_family == AF_INET) {
1160 saddr.sin.sin_addr.s_addr = oip->saddr;
1161 saddr.sa.sa_family = AF_INET;
1162 #if IS_ENABLED(CONFIG_IPV6)
1164 oip6 = ipv6_hdr(skb);
1165 saddr.sin6.sin6_addr = oip6->saddr;
1166 saddr.sa.sa_family = AF_INET6;
1171 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1175 if ((vxlan->flags & VXLAN_F_LEARN) &&
1176 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1179 skb_reset_network_header(skb);
1180 /* In flow-based mode, GBP is carried in dst_metadata */
1181 if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1182 skb->mark = md->gbp;
1185 err = IP6_ECN_decapsulate(oip6, skb);
1187 err = IP_ECN_decapsulate(oip, skb);
1189 if (unlikely(err)) {
1190 if (log_ecn_error) {
1192 net_info_ratelimited("non-ECT from %pI6\n",
1195 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1196 &oip->saddr, oip->tos);
1199 ++vxlan->dev->stats.rx_frame_errors;
1200 ++vxlan->dev->stats.rx_errors;
1205 stats = this_cpu_ptr(vxlan->dev->tstats);
1206 u64_stats_update_begin(&stats->syncp);
1207 stats->rx_packets++;
1208 stats->rx_bytes += skb->len;
1209 u64_stats_update_end(&stats->syncp);
1211 gro_cells_receive(&vxlan->gro_cells, skb);
1216 dst_release((struct dst_entry *)tun_dst);
1218 /* Consume bad packet */
1222 /* Callback from net/ipv4/udp.c to receive packets */
1223 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1225 struct metadata_dst *tun_dst = NULL;
1226 struct vxlan_sock *vs;
1227 struct vxlanhdr *vxh;
1229 struct vxlan_metadata _md;
1230 struct vxlan_metadata *md = &_md;
1232 /* Need Vxlan and inner Ethernet header to be present */
1233 if (!pskb_may_pull(skb, VXLAN_HLEN))
1236 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1237 flags = ntohl(vxh->vx_flags);
1238 vni = ntohl(vxh->vx_vni);
1240 if (flags & VXLAN_HF_VNI) {
1241 flags &= ~VXLAN_HF_VNI;
1243 /* VNI flag always required to be set */
1247 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1249 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1251 vs = rcu_dereference_sk_user_data(sk);
1255 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1256 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1257 !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1261 flags &= ~VXLAN_HF_RCO;
1262 vni &= VXLAN_VNI_MASK;
1265 if (vxlan_collect_metadata(vs)) {
1266 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1267 cpu_to_be64(vni >> 8), sizeof(*md));
1272 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1274 memset(md, 0, sizeof(*md));
1277 /* For backwards compatibility, only allow reserved fields to be
1278 * used by VXLAN extensions if explicitly requested.
1280 if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1281 struct vxlanhdr_gbp *gbp;
1283 gbp = (struct vxlanhdr_gbp *)vxh;
1284 md->gbp = ntohs(gbp->policy_id);
1287 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1289 if (gbp->dont_learn)
1290 md->gbp |= VXLAN_GBP_DONT_LEARN;
1292 if (gbp->policy_applied)
1293 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1295 flags &= ~VXLAN_GBP_USED_BITS;
1298 if (flags || vni & ~VXLAN_VNI_MASK) {
1299 /* If there are any unprocessed flags remaining treat
1300 * this as a malformed packet. This behavior diverges from
1301 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1302 * in reserved fields are to be ignored. The approach here
1303 * maintains compatibility with previous stack code, and also
1304 * is more robust and provides a little more security in
1305 * adding extensions to VXLAN.
1311 vxlan_rcv(vs, skb, md, vni >> 8, tun_dst);
1315 /* Consume bad packet */
1320 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1321 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1325 dst_release((struct dst_entry *)tun_dst);
1327 /* Return non vxlan pkt */
1331 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1333 struct vxlan_dev *vxlan = netdev_priv(dev);
1334 struct arphdr *parp;
1337 struct neighbour *n;
1339 if (dev->flags & IFF_NOARP)
1342 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1343 dev->stats.tx_dropped++;
1346 parp = arp_hdr(skb);
1348 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1349 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1350 parp->ar_pro != htons(ETH_P_IP) ||
1351 parp->ar_op != htons(ARPOP_REQUEST) ||
1352 parp->ar_hln != dev->addr_len ||
1355 arpptr = (u8 *)parp + sizeof(struct arphdr);
1357 arpptr += dev->addr_len; /* sha */
1358 memcpy(&sip, arpptr, sizeof(sip));
1359 arpptr += sizeof(sip);
1360 arpptr += dev->addr_len; /* tha */
1361 memcpy(&tip, arpptr, sizeof(tip));
1363 if (ipv4_is_loopback(tip) ||
1364 ipv4_is_multicast(tip))
1367 n = neigh_lookup(&arp_tbl, &tip, dev);
1370 struct vxlan_fdb *f;
1371 struct sk_buff *reply;
1373 if (!(n->nud_state & NUD_CONNECTED)) {
1378 f = vxlan_find_mac(vxlan, n->ha);
1379 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1380 /* bridge-local neighbor */
1385 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1393 skb_reset_mac_header(reply);
1394 __skb_pull(reply, skb_network_offset(reply));
1395 reply->ip_summed = CHECKSUM_UNNECESSARY;
1396 reply->pkt_type = PACKET_HOST;
1398 if (netif_rx_ni(reply) == NET_RX_DROP)
1399 dev->stats.rx_dropped++;
1400 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1401 union vxlan_addr ipa = {
1402 .sin.sin_addr.s_addr = tip,
1403 .sin.sin_family = AF_INET,
1406 vxlan_ip_miss(dev, &ipa);
1410 return NETDEV_TX_OK;
1413 #if IS_ENABLED(CONFIG_IPV6)
1414 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1415 struct neighbour *n, bool isrouter)
1417 struct net_device *dev = request->dev;
1418 struct sk_buff *reply;
1419 struct nd_msg *ns, *na;
1420 struct ipv6hdr *pip6;
1422 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1429 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1430 sizeof(*na) + na_olen + dev->needed_tailroom;
1431 reply = alloc_skb(len, GFP_ATOMIC);
1435 reply->protocol = htons(ETH_P_IPV6);
1437 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1438 skb_push(reply, sizeof(struct ethhdr));
1439 skb_set_mac_header(reply, 0);
1441 ns = (struct nd_msg *)skb_transport_header(request);
1443 daddr = eth_hdr(request)->h_source;
1444 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1445 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1446 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1447 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1452 /* Ethernet header */
1453 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1454 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1455 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1456 reply->protocol = htons(ETH_P_IPV6);
1458 skb_pull(reply, sizeof(struct ethhdr));
1459 skb_set_network_header(reply, 0);
1460 skb_put(reply, sizeof(struct ipv6hdr));
1464 pip6 = ipv6_hdr(reply);
1465 memset(pip6, 0, sizeof(struct ipv6hdr));
1467 pip6->priority = ipv6_hdr(request)->priority;
1468 pip6->nexthdr = IPPROTO_ICMPV6;
1469 pip6->hop_limit = 255;
1470 pip6->daddr = ipv6_hdr(request)->saddr;
1471 pip6->saddr = *(struct in6_addr *)n->primary_key;
1473 skb_pull(reply, sizeof(struct ipv6hdr));
1474 skb_set_transport_header(reply, 0);
1476 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1478 /* Neighbor Advertisement */
1479 memset(na, 0, sizeof(*na)+na_olen);
1480 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1481 na->icmph.icmp6_router = isrouter;
1482 na->icmph.icmp6_override = 1;
1483 na->icmph.icmp6_solicited = 1;
1484 na->target = ns->target;
1485 ether_addr_copy(&na->opt[2], n->ha);
1486 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1487 na->opt[1] = na_olen >> 3;
1489 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1490 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1491 csum_partial(na, sizeof(*na)+na_olen, 0));
1493 pip6->payload_len = htons(sizeof(*na)+na_olen);
1495 skb_push(reply, sizeof(struct ipv6hdr));
1497 reply->ip_summed = CHECKSUM_UNNECESSARY;
1502 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1504 struct vxlan_dev *vxlan = netdev_priv(dev);
1506 const struct ipv6hdr *iphdr;
1507 const struct in6_addr *saddr, *daddr;
1508 struct neighbour *n;
1509 struct inet6_dev *in6_dev;
1511 in6_dev = __in6_dev_get(dev);
1515 iphdr = ipv6_hdr(skb);
1516 saddr = &iphdr->saddr;
1517 daddr = &iphdr->daddr;
1519 msg = (struct nd_msg *)skb_transport_header(skb);
1520 if (msg->icmph.icmp6_code != 0 ||
1521 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1524 if (ipv6_addr_loopback(daddr) ||
1525 ipv6_addr_is_multicast(&msg->target))
1528 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1531 struct vxlan_fdb *f;
1532 struct sk_buff *reply;
1534 if (!(n->nud_state & NUD_CONNECTED)) {
1539 f = vxlan_find_mac(vxlan, n->ha);
1540 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1541 /* bridge-local neighbor */
1546 reply = vxlan_na_create(skb, n,
1547 !!(f ? f->flags & NTF_ROUTER : 0));
1554 if (netif_rx_ni(reply) == NET_RX_DROP)
1555 dev->stats.rx_dropped++;
1557 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1558 union vxlan_addr ipa = {
1559 .sin6.sin6_addr = msg->target,
1560 .sin6.sin6_family = AF_INET6,
1563 vxlan_ip_miss(dev, &ipa);
1568 return NETDEV_TX_OK;
1572 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1574 struct vxlan_dev *vxlan = netdev_priv(dev);
1575 struct neighbour *n;
1577 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1581 switch (ntohs(eth_hdr(skb)->h_proto)) {
1586 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1589 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1590 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1591 union vxlan_addr ipa = {
1592 .sin.sin_addr.s_addr = pip->daddr,
1593 .sin.sin_family = AF_INET,
1596 vxlan_ip_miss(dev, &ipa);
1602 #if IS_ENABLED(CONFIG_IPV6)
1605 struct ipv6hdr *pip6;
1607 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1609 pip6 = ipv6_hdr(skb);
1610 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1611 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1612 union vxlan_addr ipa = {
1613 .sin6.sin6_addr = pip6->daddr,
1614 .sin6.sin6_family = AF_INET6,
1617 vxlan_ip_miss(dev, &ipa);
1631 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1633 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1635 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1644 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1645 struct vxlan_metadata *md)
1647 struct vxlanhdr_gbp *gbp;
1652 gbp = (struct vxlanhdr_gbp *)vxh;
1653 vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1655 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1656 gbp->dont_learn = 1;
1658 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1659 gbp->policy_applied = 1;
1661 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1664 #if IS_ENABLED(CONFIG_IPV6)
1665 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1666 struct sk_buff *skb,
1667 struct net_device *dev, struct in6_addr *saddr,
1668 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1669 __be16 src_port, __be16 dst_port, __be32 vni,
1670 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1672 struct vxlanhdr *vxh;
1675 bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1676 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1677 u16 hdrlen = sizeof(struct vxlanhdr);
1679 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1680 skb->ip_summed == CHECKSUM_PARTIAL) {
1681 int csum_start = skb_checksum_start_offset(skb);
1683 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1684 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1685 (skb->csum_offset == offsetof(struct udphdr, check) ||
1686 skb->csum_offset == offsetof(struct tcphdr, check))) {
1688 type |= SKB_GSO_TUNNEL_REMCSUM;
1692 skb_scrub_packet(skb, xnet);
1694 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1695 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1696 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1698 /* Need space for new headers (invalidates iph ptr) */
1699 err = skb_cow_head(skb, min_headroom);
1700 if (unlikely(err)) {
1705 skb = vlan_hwaccel_push_inside(skb);
1706 if (WARN_ON(!skb)) {
1711 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1717 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1718 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1721 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1722 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1725 if (skb->csum_offset == offsetof(struct udphdr, check))
1726 data |= VXLAN_RCO_UDP;
1728 vxh->vx_vni |= htonl(data);
1729 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1731 if (!skb_is_gso(skb)) {
1732 skb->ip_summed = CHECKSUM_NONE;
1733 skb->encapsulation = 0;
1737 if (vxflags & VXLAN_F_GBP)
1738 vxlan_build_gbp_hdr(vxh, vxflags, md);
1740 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1742 udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1743 ttl, src_port, dst_port,
1744 !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1752 static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
1753 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1754 __be16 src_port, __be16 dst_port, __be32 vni,
1755 struct vxlan_metadata *md, bool xnet, u32 vxflags)
1757 struct vxlanhdr *vxh;
1760 bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1761 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1762 u16 hdrlen = sizeof(struct vxlanhdr);
1764 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1765 skb->ip_summed == CHECKSUM_PARTIAL) {
1766 int csum_start = skb_checksum_start_offset(skb);
1768 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1769 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1770 (skb->csum_offset == offsetof(struct udphdr, check) ||
1771 skb->csum_offset == offsetof(struct tcphdr, check))) {
1773 type |= SKB_GSO_TUNNEL_REMCSUM;
1777 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1778 + VXLAN_HLEN + sizeof(struct iphdr)
1779 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1781 /* Need space for new headers (invalidates iph ptr) */
1782 err = skb_cow_head(skb, min_headroom);
1783 if (unlikely(err)) {
1788 skb = vlan_hwaccel_push_inside(skb);
1792 skb = iptunnel_handle_offloads(skb, udp_sum, type);
1794 return PTR_ERR(skb);
1796 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1797 vxh->vx_flags = htonl(VXLAN_HF_VNI);
1800 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1801 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1804 if (skb->csum_offset == offsetof(struct udphdr, check))
1805 data |= VXLAN_RCO_UDP;
1807 vxh->vx_vni |= htonl(data);
1808 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1810 if (!skb_is_gso(skb)) {
1811 skb->ip_summed = CHECKSUM_NONE;
1812 skb->encapsulation = 0;
1816 if (vxflags & VXLAN_F_GBP)
1817 vxlan_build_gbp_hdr(vxh, vxflags, md);
1819 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1821 return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
1822 ttl, df, src_port, dst_port, xnet,
1823 !(vxflags & VXLAN_F_UDP_CSUM));
1826 /* Bypass encapsulation if the destination is local */
1827 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1828 struct vxlan_dev *dst_vxlan)
1830 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1831 union vxlan_addr loopback;
1832 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1833 struct net_device *dev = skb->dev;
1836 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1837 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1838 skb->pkt_type = PACKET_HOST;
1839 skb->encapsulation = 0;
1840 skb->dev = dst_vxlan->dev;
1841 __skb_pull(skb, skb_network_offset(skb));
1843 if (remote_ip->sa.sa_family == AF_INET) {
1844 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1845 loopback.sa.sa_family = AF_INET;
1846 #if IS_ENABLED(CONFIG_IPV6)
1848 loopback.sin6.sin6_addr = in6addr_loopback;
1849 loopback.sa.sa_family = AF_INET6;
1853 if (dst_vxlan->flags & VXLAN_F_LEARN)
1854 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1856 u64_stats_update_begin(&tx_stats->syncp);
1857 tx_stats->tx_packets++;
1858 tx_stats->tx_bytes += len;
1859 u64_stats_update_end(&tx_stats->syncp);
1861 if (netif_rx(skb) == NET_RX_SUCCESS) {
1862 u64_stats_update_begin(&rx_stats->syncp);
1863 rx_stats->rx_packets++;
1864 rx_stats->rx_bytes += len;
1865 u64_stats_update_end(&rx_stats->syncp);
1867 dev->stats.rx_dropped++;
1871 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1872 struct vxlan_rdst *rdst, bool did_rsc)
1874 struct ip_tunnel_info *info;
1875 struct vxlan_dev *vxlan = netdev_priv(dev);
1876 struct sock *sk = vxlan->vn_sock->sock->sk;
1877 unsigned short family = vxlan_get_sk_family(vxlan->vn_sock);
1878 struct rtable *rt = NULL;
1879 const struct iphdr *old_iph;
1881 union vxlan_addr *dst;
1882 union vxlan_addr remote_ip;
1883 struct vxlan_metadata _md;
1884 struct vxlan_metadata *md = &_md;
1885 __be16 src_port = 0, dst_port;
1890 u32 flags = vxlan->flags;
1892 info = skb_tunnel_info(skb);
1895 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1896 vni = rdst->remote_vni;
1897 dst = &rdst->remote_ip;
1900 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1904 if (family != ip_tunnel_info_af(info))
1907 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1908 vni = be64_to_cpu(info->key.tun_id);
1909 remote_ip.sa.sa_family = family;
1910 if (family == AF_INET)
1911 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1913 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1917 if (vxlan_addr_any(dst)) {
1919 /* short-circuited back to local bridge */
1920 vxlan_encap_bypass(skb, vxlan, vxlan);
1926 old_iph = ip_hdr(skb);
1928 ttl = vxlan->cfg.ttl;
1929 if (!ttl && vxlan_addr_multicast(dst))
1932 tos = vxlan->cfg.tos;
1934 tos = ip_tunnel_get_dsfield(old_iph, skb);
1936 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1937 vxlan->cfg.port_max, true);
1940 if (info->key.tun_flags & TUNNEL_CSUM)
1941 flags |= VXLAN_F_UDP_CSUM;
1943 flags &= ~VXLAN_F_UDP_CSUM;
1945 ttl = info->key.ttl;
1946 tos = info->key.tos;
1948 if (info->options_len)
1949 md = ip_tunnel_info_opts(info);
1951 md->gbp = skb->mark;
1954 if (dst->sa.sa_family == AF_INET) {
1955 if (info && (info->key.tun_flags & TUNNEL_DONT_FRAGMENT))
1958 memset(&fl4, 0, sizeof(fl4));
1959 fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
1960 fl4.flowi4_tos = RT_TOS(tos);
1961 fl4.flowi4_mark = skb->mark;
1962 fl4.flowi4_proto = IPPROTO_UDP;
1963 fl4.daddr = dst->sin.sin_addr.s_addr;
1964 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1966 rt = ip_route_output_key(vxlan->net, &fl4);
1968 netdev_dbg(dev, "no route to %pI4\n",
1969 &dst->sin.sin_addr.s_addr);
1970 dev->stats.tx_carrier_errors++;
1974 if (rt->dst.dev == dev) {
1975 netdev_dbg(dev, "circular route to %pI4\n",
1976 &dst->sin.sin_addr.s_addr);
1977 dev->stats.collisions++;
1981 /* Bypass encapsulation if the destination is local */
1982 if (rt->rt_flags & RTCF_LOCAL &&
1983 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1984 struct vxlan_dev *dst_vxlan;
1987 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1988 dst->sa.sa_family, dst_port,
1992 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1996 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1997 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1998 err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
1999 dst->sin.sin_addr.s_addr, tos, ttl, df,
2000 src_port, dst_port, htonl(vni << 8), md,
2001 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2004 /* skb is already freed. */
2009 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
2010 #if IS_ENABLED(CONFIG_IPV6)
2012 struct dst_entry *ndst;
2016 memset(&fl6, 0, sizeof(fl6));
2017 fl6.flowi6_oif = rdst ? rdst->remote_ifindex : 0;
2018 fl6.daddr = dst->sin6.sin6_addr;
2019 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
2020 fl6.flowi6_mark = skb->mark;
2021 fl6.flowi6_proto = IPPROTO_UDP;
2023 if (ipv6_stub->ipv6_dst_lookup(vxlan->net, sk, &ndst, &fl6)) {
2024 netdev_dbg(dev, "no route to %pI6\n",
2025 &dst->sin6.sin6_addr);
2026 dev->stats.tx_carrier_errors++;
2030 if (ndst->dev == dev) {
2031 netdev_dbg(dev, "circular route to %pI6\n",
2032 &dst->sin6.sin6_addr);
2034 dev->stats.collisions++;
2038 /* Bypass encapsulation if the destination is local */
2039 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2040 if (rt6i_flags & RTF_LOCAL &&
2041 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2042 struct vxlan_dev *dst_vxlan;
2045 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2046 dst->sa.sa_family, dst_port,
2050 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2054 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2055 err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
2056 0, ttl, src_port, dst_port, htonl(vni << 8), md,
2057 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2065 dev->stats.tx_dropped++;
2071 dev->stats.tx_errors++;
2076 /* Transmit local packets over Vxlan
2078 * Outer IP header inherits ECN and DF from inner header.
2079 * Outer UDP destination is the VXLAN assigned port.
2080 * source port is based on hash of flow
2082 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2084 struct vxlan_dev *vxlan = netdev_priv(dev);
2085 const struct ip_tunnel_info *info;
2087 bool did_rsc = false;
2088 struct vxlan_rdst *rdst, *fdst = NULL;
2089 struct vxlan_fdb *f;
2091 info = skb_tunnel_info(skb);
2093 skb_reset_mac_header(skb);
2096 if ((vxlan->flags & VXLAN_F_PROXY)) {
2097 if (ntohs(eth->h_proto) == ETH_P_ARP)
2098 return arp_reduce(dev, skb);
2099 #if IS_ENABLED(CONFIG_IPV6)
2100 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2101 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2102 + sizeof(struct nd_msg)) &&
2103 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2106 msg = (struct nd_msg *)skb_transport_header(skb);
2107 if (msg->icmph.icmp6_code == 0 &&
2108 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2109 return neigh_reduce(dev, skb);
2115 if (vxlan->flags & VXLAN_F_COLLECT_METADATA &&
2116 info && info->mode & IP_TUNNEL_INFO_TX) {
2117 vxlan_xmit_one(skb, dev, NULL, false);
2118 return NETDEV_TX_OK;
2121 f = vxlan_find_mac(vxlan, eth->h_dest);
2124 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2125 (ntohs(eth->h_proto) == ETH_P_IP ||
2126 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2127 did_rsc = route_shortcircuit(dev, skb);
2129 f = vxlan_find_mac(vxlan, eth->h_dest);
2133 f = vxlan_find_mac(vxlan, all_zeros_mac);
2135 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2136 !is_multicast_ether_addr(eth->h_dest))
2137 vxlan_fdb_miss(vxlan, eth->h_dest);
2139 dev->stats.tx_dropped++;
2141 return NETDEV_TX_OK;
2145 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2146 struct sk_buff *skb1;
2152 skb1 = skb_clone(skb, GFP_ATOMIC);
2154 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2158 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2161 return NETDEV_TX_OK;
2164 /* Walk the forwarding table and purge stale entries */
2165 static void vxlan_cleanup(unsigned long arg)
2167 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2168 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2171 if (!netif_running(vxlan->dev))
2174 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2175 struct hlist_node *p, *n;
2177 spin_lock_bh(&vxlan->hash_lock);
2178 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2180 = container_of(p, struct vxlan_fdb, hlist);
2181 unsigned long timeout;
2183 if (f->state & NUD_PERMANENT)
2186 timeout = f->used + vxlan->cfg.age_interval * HZ;
2187 if (time_before_eq(timeout, jiffies)) {
2188 netdev_dbg(vxlan->dev,
2189 "garbage collect %pM\n",
2191 f->state = NUD_STALE;
2192 vxlan_fdb_destroy(vxlan, f);
2193 } else if (time_before(timeout, next_timer))
2194 next_timer = timeout;
2196 spin_unlock_bh(&vxlan->hash_lock);
2199 mod_timer(&vxlan->age_timer, next_timer);
2202 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2204 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2205 __u32 vni = vxlan->default_dst.remote_vni;
2207 vxlan->vn_sock = vs;
2208 spin_lock(&vn->sock_lock);
2209 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2210 spin_unlock(&vn->sock_lock);
2213 /* Setup stats when device is created */
2214 static int vxlan_init(struct net_device *dev)
2216 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2223 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2225 struct vxlan_fdb *f;
2227 spin_lock_bh(&vxlan->hash_lock);
2228 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2230 vxlan_fdb_destroy(vxlan, f);
2231 spin_unlock_bh(&vxlan->hash_lock);
2234 static void vxlan_uninit(struct net_device *dev)
2236 struct vxlan_dev *vxlan = netdev_priv(dev);
2238 vxlan_fdb_delete_default(vxlan);
2240 free_percpu(dev->tstats);
2243 /* Start ageing timer and join group when device is brought up */
2244 static int vxlan_open(struct net_device *dev)
2246 struct vxlan_dev *vxlan = netdev_priv(dev);
2247 struct vxlan_sock *vs;
2250 vs = vxlan_sock_add(vxlan->net, vxlan->cfg.dst_port,
2251 vxlan->cfg.no_share, vxlan->flags);
2255 vxlan_vs_add_dev(vs, vxlan);
2257 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2258 ret = vxlan_igmp_join(vxlan);
2259 if (ret == -EADDRINUSE)
2262 vxlan_sock_release(vs);
2267 if (vxlan->cfg.age_interval)
2268 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2273 /* Purge the forwarding table */
2274 static void vxlan_flush(struct vxlan_dev *vxlan)
2278 spin_lock_bh(&vxlan->hash_lock);
2279 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2280 struct hlist_node *p, *n;
2281 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2283 = container_of(p, struct vxlan_fdb, hlist);
2284 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2285 if (!is_zero_ether_addr(f->eth_addr))
2286 vxlan_fdb_destroy(vxlan, f);
2289 spin_unlock_bh(&vxlan->hash_lock);
2292 /* Cleanup timer and forwarding table on shutdown */
2293 static int vxlan_stop(struct net_device *dev)
2295 struct vxlan_dev *vxlan = netdev_priv(dev);
2296 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2297 struct vxlan_sock *vs = vxlan->vn_sock;
2300 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2301 !vxlan_group_used(vn, vxlan))
2302 ret = vxlan_igmp_leave(vxlan);
2304 del_timer_sync(&vxlan->age_timer);
2307 vxlan_sock_release(vs);
2312 /* Stub, nothing needs to be done. */
2313 static void vxlan_set_multicast_list(struct net_device *dev)
2317 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2319 struct vxlan_dev *vxlan = netdev_priv(dev);
2320 struct vxlan_rdst *dst = &vxlan->default_dst;
2321 struct net_device *lowerdev;
2324 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2325 if (lowerdev == NULL)
2326 return eth_change_mtu(dev, new_mtu);
2328 if (dst->remote_ip.sa.sa_family == AF_INET6)
2329 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2331 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2333 if (new_mtu < 68 || new_mtu > max_mtu)
2340 static const struct net_device_ops vxlan_netdev_ops = {
2341 .ndo_init = vxlan_init,
2342 .ndo_uninit = vxlan_uninit,
2343 .ndo_open = vxlan_open,
2344 .ndo_stop = vxlan_stop,
2345 .ndo_start_xmit = vxlan_xmit,
2346 .ndo_get_stats64 = ip_tunnel_get_stats64,
2347 .ndo_set_rx_mode = vxlan_set_multicast_list,
2348 .ndo_change_mtu = vxlan_change_mtu,
2349 .ndo_validate_addr = eth_validate_addr,
2350 .ndo_set_mac_address = eth_mac_addr,
2351 .ndo_fdb_add = vxlan_fdb_add,
2352 .ndo_fdb_del = vxlan_fdb_delete,
2353 .ndo_fdb_dump = vxlan_fdb_dump,
2356 /* Info for udev, that this is a virtual tunnel endpoint */
2357 static struct device_type vxlan_type = {
2361 /* Calls the ndo_add_vxlan_port of the caller in order to
2362 * supply the listening VXLAN udp ports. Callers are expected
2363 * to implement the ndo_add_vxlan_port.
2365 void vxlan_get_rx_port(struct net_device *dev)
2367 struct vxlan_sock *vs;
2368 struct net *net = dev_net(dev);
2369 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2370 sa_family_t sa_family;
2374 spin_lock(&vn->sock_lock);
2375 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2376 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2377 port = inet_sk(vs->sock->sk)->inet_sport;
2378 sa_family = vxlan_get_sk_family(vs);
2379 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2383 spin_unlock(&vn->sock_lock);
2385 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2387 /* Initialize the device structure. */
2388 static void vxlan_setup(struct net_device *dev)
2390 struct vxlan_dev *vxlan = netdev_priv(dev);
2393 eth_hw_addr_random(dev);
2396 dev->netdev_ops = &vxlan_netdev_ops;
2397 dev->destructor = free_netdev;
2398 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2400 dev->features |= NETIF_F_LLTX;
2401 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2402 dev->features |= NETIF_F_RXCSUM;
2403 dev->features |= NETIF_F_GSO_SOFTWARE;
2405 dev->vlan_features = dev->features;
2406 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2407 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2408 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2409 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2410 netif_keep_dst(dev);
2411 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2413 INIT_LIST_HEAD(&vxlan->next);
2414 spin_lock_init(&vxlan->hash_lock);
2416 init_timer_deferrable(&vxlan->age_timer);
2417 vxlan->age_timer.function = vxlan_cleanup;
2418 vxlan->age_timer.data = (unsigned long) vxlan;
2420 vxlan->cfg.dst_port = htons(vxlan_port);
2424 gro_cells_init(&vxlan->gro_cells, dev);
2426 for (h = 0; h < FDB_HASH_SIZE; ++h)
2427 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2430 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2431 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2432 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2433 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2434 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2435 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2436 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2437 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2438 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2439 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2440 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2441 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2442 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2443 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2444 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2445 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2446 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2447 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2448 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2449 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2450 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2451 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2452 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2453 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2454 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2455 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2458 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2460 if (tb[IFLA_ADDRESS]) {
2461 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2462 pr_debug("invalid link address (not ethernet)\n");
2466 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2467 pr_debug("invalid all zero ethernet address\n");
2468 return -EADDRNOTAVAIL;
2475 if (data[IFLA_VXLAN_ID]) {
2476 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2477 if (id >= VXLAN_VID_MASK)
2481 if (data[IFLA_VXLAN_PORT_RANGE]) {
2482 const struct ifla_vxlan_port_range *p
2483 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2485 if (ntohs(p->high) < ntohs(p->low)) {
2486 pr_debug("port range %u .. %u not valid\n",
2487 ntohs(p->low), ntohs(p->high));
2495 static void vxlan_get_drvinfo(struct net_device *netdev,
2496 struct ethtool_drvinfo *drvinfo)
2498 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2499 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2502 static const struct ethtool_ops vxlan_ethtool_ops = {
2503 .get_drvinfo = vxlan_get_drvinfo,
2504 .get_link = ethtool_op_get_link,
2507 static void vxlan_del_work(struct work_struct *work)
2509 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2510 udp_tunnel_sock_release(vs->sock);
2514 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2515 __be16 port, u32 flags)
2517 struct socket *sock;
2518 struct udp_port_cfg udp_conf;
2521 memset(&udp_conf, 0, sizeof(udp_conf));
2524 udp_conf.family = AF_INET6;
2525 udp_conf.use_udp6_rx_checksums =
2526 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2527 udp_conf.ipv6_v6only = 1;
2529 udp_conf.family = AF_INET;
2532 udp_conf.local_udp_port = port;
2534 /* Open UDP socket */
2535 err = udp_sock_create(net, &udp_conf, &sock);
2537 return ERR_PTR(err);
2542 /* Create new listen socket if needed */
2543 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2546 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2547 struct vxlan_sock *vs;
2548 struct socket *sock;
2550 bool ipv6 = !!(flags & VXLAN_F_IPV6);
2551 struct udp_tunnel_sock_cfg tunnel_cfg;
2553 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2555 return ERR_PTR(-ENOMEM);
2557 for (h = 0; h < VNI_HASH_SIZE; ++h)
2558 INIT_HLIST_HEAD(&vs->vni_list[h]);
2560 INIT_WORK(&vs->del_work, vxlan_del_work);
2562 sock = vxlan_create_sock(net, ipv6, port, flags);
2564 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2567 return ERR_CAST(sock);
2571 atomic_set(&vs->refcnt, 1);
2572 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2574 /* Initialize the vxlan udp offloads structure */
2575 vs->udp_offloads.port = port;
2576 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2577 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2579 spin_lock(&vn->sock_lock);
2580 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2581 vxlan_notify_add_rx_port(vs);
2582 spin_unlock(&vn->sock_lock);
2584 /* Mark socket as an encapsulation socket. */
2585 tunnel_cfg.sk_user_data = vs;
2586 tunnel_cfg.encap_type = 1;
2587 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2588 tunnel_cfg.encap_destroy = NULL;
2590 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2595 static struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2596 bool no_share, u32 flags)
2598 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2599 struct vxlan_sock *vs;
2600 bool ipv6 = flags & VXLAN_F_IPV6;
2603 spin_lock(&vn->sock_lock);
2604 vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port,
2607 if (!atomic_add_unless(&vs->refcnt, 1, 0))
2608 vs = ERR_PTR(-EBUSY);
2609 spin_unlock(&vn->sock_lock);
2612 spin_unlock(&vn->sock_lock);
2615 return vxlan_socket_create(net, port, flags);
2618 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2619 struct vxlan_config *conf)
2621 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2622 struct vxlan_dev *vxlan = netdev_priv(dev);
2623 struct vxlan_rdst *dst = &vxlan->default_dst;
2625 bool use_ipv6 = false;
2626 __be16 default_port = vxlan->cfg.dst_port;
2628 vxlan->net = src_net;
2630 dst->remote_vni = conf->vni;
2632 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2634 /* Unless IPv6 is explicitly requested, assume IPv4 */
2635 if (!dst->remote_ip.sa.sa_family)
2636 dst->remote_ip.sa.sa_family = AF_INET;
2638 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2639 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2640 if (!IS_ENABLED(CONFIG_IPV6))
2641 return -EPFNOSUPPORT;
2645 if (conf->remote_ifindex) {
2646 struct net_device *lowerdev
2647 = __dev_get_by_index(src_net, conf->remote_ifindex);
2649 dst->remote_ifindex = conf->remote_ifindex;
2652 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2656 #if IS_ENABLED(CONFIG_IPV6)
2658 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2659 if (idev && idev->cnf.disable_ipv6) {
2660 pr_info("IPv6 is disabled via sysctl\n");
2663 vxlan->flags |= VXLAN_F_IPV6;
2668 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2670 dev->needed_headroom = lowerdev->hard_header_len +
2671 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2672 } else if (use_ipv6) {
2673 vxlan->flags |= VXLAN_F_IPV6;
2674 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2676 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2679 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2680 if (!vxlan->cfg.dst_port)
2681 vxlan->cfg.dst_port = default_port;
2682 vxlan->flags |= conf->flags;
2684 if (!vxlan->cfg.age_interval)
2685 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2687 if (vxlan_find_vni(src_net, conf->vni, use_ipv6 ? AF_INET6 : AF_INET,
2688 vxlan->cfg.dst_port, vxlan->flags))
2691 dev->ethtool_ops = &vxlan_ethtool_ops;
2693 /* create an fdb entry for a valid default destination */
2694 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2695 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2696 &vxlan->default_dst.remote_ip,
2697 NUD_REACHABLE|NUD_PERMANENT,
2698 NLM_F_EXCL|NLM_F_CREATE,
2699 vxlan->cfg.dst_port,
2700 vxlan->default_dst.remote_vni,
2701 vxlan->default_dst.remote_ifindex,
2707 err = register_netdevice(dev);
2709 vxlan_fdb_delete_default(vxlan);
2713 list_add(&vxlan->next, &vn->vxlan_list);
2718 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2719 u8 name_assign_type, struct vxlan_config *conf)
2721 struct nlattr *tb[IFLA_MAX+1];
2722 struct net_device *dev;
2725 memset(&tb, 0, sizeof(tb));
2727 dev = rtnl_create_link(net, name, name_assign_type,
2728 &vxlan_link_ops, tb);
2732 err = vxlan_dev_configure(net, dev, conf);
2735 return ERR_PTR(err);
2740 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2742 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2743 struct nlattr *tb[], struct nlattr *data[])
2745 struct vxlan_config conf;
2748 memset(&conf, 0, sizeof(conf));
2750 if (data[IFLA_VXLAN_ID])
2751 conf.vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2753 if (data[IFLA_VXLAN_GROUP]) {
2754 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2755 } else if (data[IFLA_VXLAN_GROUP6]) {
2756 if (!IS_ENABLED(CONFIG_IPV6))
2757 return -EPFNOSUPPORT;
2759 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2760 conf.remote_ip.sa.sa_family = AF_INET6;
2763 if (data[IFLA_VXLAN_LOCAL]) {
2764 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2765 conf.saddr.sa.sa_family = AF_INET;
2766 } else if (data[IFLA_VXLAN_LOCAL6]) {
2767 if (!IS_ENABLED(CONFIG_IPV6))
2768 return -EPFNOSUPPORT;
2770 /* TODO: respect scope id */
2771 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2772 conf.saddr.sa.sa_family = AF_INET6;
2775 if (data[IFLA_VXLAN_LINK])
2776 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2778 if (data[IFLA_VXLAN_TOS])
2779 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2781 if (data[IFLA_VXLAN_TTL])
2782 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2784 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2785 conf.flags |= VXLAN_F_LEARN;
2787 if (data[IFLA_VXLAN_AGEING])
2788 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2790 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2791 conf.flags |= VXLAN_F_PROXY;
2793 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2794 conf.flags |= VXLAN_F_RSC;
2796 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2797 conf.flags |= VXLAN_F_L2MISS;
2799 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2800 conf.flags |= VXLAN_F_L3MISS;
2802 if (data[IFLA_VXLAN_LIMIT])
2803 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2805 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2806 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2807 conf.flags |= VXLAN_F_COLLECT_METADATA;
2809 if (data[IFLA_VXLAN_PORT_RANGE]) {
2810 const struct ifla_vxlan_port_range *p
2811 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2812 conf.port_min = ntohs(p->low);
2813 conf.port_max = ntohs(p->high);
2816 if (data[IFLA_VXLAN_PORT])
2817 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2819 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2820 conf.flags |= VXLAN_F_UDP_CSUM;
2822 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2823 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2824 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2826 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2827 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2828 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2830 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2831 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2832 conf.flags |= VXLAN_F_REMCSUM_TX;
2834 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2835 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2836 conf.flags |= VXLAN_F_REMCSUM_RX;
2838 if (data[IFLA_VXLAN_GBP])
2839 conf.flags |= VXLAN_F_GBP;
2841 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2842 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2844 err = vxlan_dev_configure(src_net, dev, &conf);
2847 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2851 pr_info("IPv6 is disabled via sysctl\n");
2855 pr_info("duplicate VNI %u\n", conf.vni);
2862 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2864 struct vxlan_dev *vxlan = netdev_priv(dev);
2865 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2867 spin_lock(&vn->sock_lock);
2868 if (!hlist_unhashed(&vxlan->hlist))
2869 hlist_del_rcu(&vxlan->hlist);
2870 spin_unlock(&vn->sock_lock);
2872 gro_cells_destroy(&vxlan->gro_cells);
2873 list_del(&vxlan->next);
2874 unregister_netdevice_queue(dev, head);
2877 static size_t vxlan_get_size(const struct net_device *dev)
2880 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
2881 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2882 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2883 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2884 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2885 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2886 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
2887 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2888 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2889 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2890 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
2891 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
2892 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2893 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2894 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2895 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2896 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2897 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2898 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2899 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2900 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2904 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2906 const struct vxlan_dev *vxlan = netdev_priv(dev);
2907 const struct vxlan_rdst *dst = &vxlan->default_dst;
2908 struct ifla_vxlan_port_range ports = {
2909 .low = htons(vxlan->cfg.port_min),
2910 .high = htons(vxlan->cfg.port_max),
2913 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2914 goto nla_put_failure;
2916 if (!vxlan_addr_any(&dst->remote_ip)) {
2917 if (dst->remote_ip.sa.sa_family == AF_INET) {
2918 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
2919 dst->remote_ip.sin.sin_addr.s_addr))
2920 goto nla_put_failure;
2921 #if IS_ENABLED(CONFIG_IPV6)
2923 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
2924 &dst->remote_ip.sin6.sin6_addr))
2925 goto nla_put_failure;
2930 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2931 goto nla_put_failure;
2933 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
2934 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
2935 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
2936 vxlan->cfg.saddr.sin.sin_addr.s_addr))
2937 goto nla_put_failure;
2938 #if IS_ENABLED(CONFIG_IPV6)
2940 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
2941 &vxlan->cfg.saddr.sin6.sin6_addr))
2942 goto nla_put_failure;
2947 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
2948 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
2949 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2950 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2951 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2952 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2953 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2954 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2955 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2956 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2957 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2958 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
2959 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
2960 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
2961 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
2962 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
2963 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2964 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2965 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2966 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2967 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2968 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
2969 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
2970 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
2971 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
2972 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
2973 goto nla_put_failure;
2975 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2976 goto nla_put_failure;
2978 if (vxlan->flags & VXLAN_F_GBP &&
2979 nla_put_flag(skb, IFLA_VXLAN_GBP))
2980 goto nla_put_failure;
2982 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
2983 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
2984 goto nla_put_failure;
2992 static struct net *vxlan_get_link_net(const struct net_device *dev)
2994 struct vxlan_dev *vxlan = netdev_priv(dev);
2999 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3001 .maxtype = IFLA_VXLAN_MAX,
3002 .policy = vxlan_policy,
3003 .priv_size = sizeof(struct vxlan_dev),
3004 .setup = vxlan_setup,
3005 .validate = vxlan_validate,
3006 .newlink = vxlan_newlink,
3007 .dellink = vxlan_dellink,
3008 .get_size = vxlan_get_size,
3009 .fill_info = vxlan_fill_info,
3010 .get_link_net = vxlan_get_link_net,
3013 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3014 struct net_device *dev)
3016 struct vxlan_dev *vxlan, *next;
3017 LIST_HEAD(list_kill);
3019 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3020 struct vxlan_rdst *dst = &vxlan->default_dst;
3022 /* In case we created vxlan device with carrier
3023 * and we loose the carrier due to module unload
3024 * we also need to remove vxlan device. In other
3025 * cases, it's not necessary and remote_ifindex
3026 * is 0 here, so no matches.
3028 if (dst->remote_ifindex == dev->ifindex)
3029 vxlan_dellink(vxlan->dev, &list_kill);
3032 unregister_netdevice_many(&list_kill);
3035 static int vxlan_lowerdev_event(struct notifier_block *unused,
3036 unsigned long event, void *ptr)
3038 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3039 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3041 if (event == NETDEV_UNREGISTER)
3042 vxlan_handle_lowerdev_unregister(vn, dev);
3047 static struct notifier_block vxlan_notifier_block __read_mostly = {
3048 .notifier_call = vxlan_lowerdev_event,
3051 static __net_init int vxlan_init_net(struct net *net)
3053 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3056 INIT_LIST_HEAD(&vn->vxlan_list);
3057 spin_lock_init(&vn->sock_lock);
3059 for (h = 0; h < PORT_HASH_SIZE; ++h)
3060 INIT_HLIST_HEAD(&vn->sock_list[h]);
3065 static void __net_exit vxlan_exit_net(struct net *net)
3067 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3068 struct vxlan_dev *vxlan, *next;
3069 struct net_device *dev, *aux;
3073 for_each_netdev_safe(net, dev, aux)
3074 if (dev->rtnl_link_ops == &vxlan_link_ops)
3075 unregister_netdevice_queue(dev, &list);
3077 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3078 /* If vxlan->dev is in the same netns, it has already been added
3079 * to the list by the previous loop.
3081 if (!net_eq(dev_net(vxlan->dev), net)) {
3082 gro_cells_destroy(&vxlan->gro_cells);
3083 unregister_netdevice_queue(vxlan->dev, &list);
3087 unregister_netdevice_many(&list);
3091 static struct pernet_operations vxlan_net_ops = {
3092 .init = vxlan_init_net,
3093 .exit = vxlan_exit_net,
3094 .id = &vxlan_net_id,
3095 .size = sizeof(struct vxlan_net),
3098 static int __init vxlan_init_module(void)
3102 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3106 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3108 rc = register_pernet_subsys(&vxlan_net_ops);
3112 rc = register_netdevice_notifier(&vxlan_notifier_block);
3116 rc = rtnl_link_register(&vxlan_link_ops);
3122 unregister_netdevice_notifier(&vxlan_notifier_block);
3124 unregister_pernet_subsys(&vxlan_net_ops);
3126 destroy_workqueue(vxlan_wq);
3129 late_initcall(vxlan_init_module);
3131 static void __exit vxlan_cleanup_module(void)
3133 rtnl_link_unregister(&vxlan_link_ops);
3134 unregister_netdevice_notifier(&vxlan_notifier_block);
3135 destroy_workqueue(vxlan_wq);
3136 unregister_pernet_subsys(&vxlan_net_ops);
3137 /* rcu_barrier() is called by netns */
3139 module_exit(vxlan_cleanup_module);
3141 MODULE_LICENSE("GPL");
3142 MODULE_VERSION(VXLAN_VERSION);
3143 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3144 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3145 MODULE_ALIAS_RTNL_LINK("vxlan");