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>
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 + 2];
78 static int vxlan_sock_add(struct vxlan_dev *vxlan);
80 /* per-network namespace private data for this module */
82 struct list_head vxlan_list;
83 struct hlist_head sock_list[PORT_HASH_SIZE];
87 /* Forwarding table entry */
89 struct hlist_node hlist; /* linked list of entries */
91 unsigned long updated; /* jiffies */
93 struct list_head remotes;
94 u8 eth_addr[ETH_ALEN];
95 u16 state; /* see ndm_state */
96 u8 flags; /* see ndm_flags */
99 /* salt for hash table */
100 static u32 vxlan_salt __read_mostly;
102 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
104 return vs->flags & VXLAN_F_COLLECT_METADATA ||
105 ip_tunnel_collect_metadata();
108 #if IS_ENABLED(CONFIG_IPV6)
110 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
112 if (a->sa.sa_family != b->sa.sa_family)
114 if (a->sa.sa_family == AF_INET6)
115 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
117 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
120 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
122 if (ipa->sa.sa_family == AF_INET6)
123 return ipv6_addr_any(&ipa->sin6.sin6_addr);
125 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
128 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
130 if (ipa->sa.sa_family == AF_INET6)
131 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
133 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
136 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
138 if (nla_len(nla) >= sizeof(struct in6_addr)) {
139 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
140 ip->sa.sa_family = AF_INET6;
142 } else if (nla_len(nla) >= sizeof(__be32)) {
143 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
144 ip->sa.sa_family = AF_INET;
147 return -EAFNOSUPPORT;
151 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
152 const union vxlan_addr *ip)
154 if (ip->sa.sa_family == AF_INET6)
155 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
157 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
160 #else /* !CONFIG_IPV6 */
163 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
165 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
168 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
170 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
173 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
175 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
178 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
180 if (nla_len(nla) >= sizeof(struct in6_addr)) {
181 return -EAFNOSUPPORT;
182 } else if (nla_len(nla) >= sizeof(__be32)) {
183 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
184 ip->sa.sa_family = AF_INET;
187 return -EAFNOSUPPORT;
191 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
192 const union vxlan_addr *ip)
194 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
198 /* Virtual Network hash table head */
199 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
201 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
204 /* Socket hash table head */
205 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
207 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
209 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
212 /* First remote destination for a forwarding entry.
213 * Guaranteed to be non-NULL because remotes are never deleted.
215 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
217 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
220 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
222 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
225 /* Find VXLAN socket based on network namespace, address family and UDP port
226 * and enabled unshareable flags.
228 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
229 __be16 port, u32 flags)
231 struct vxlan_sock *vs;
233 flags &= VXLAN_F_RCV_FLAGS;
235 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
236 if (inet_sk(vs->sock->sk)->inet_sport == port &&
237 vxlan_get_sk_family(vs) == family &&
244 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
246 struct vxlan_dev *vxlan;
248 /* For flow based devices, map all packets to VNI 0 */
249 if (vs->flags & VXLAN_F_COLLECT_METADATA)
252 hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
253 if (vxlan->default_dst.remote_vni == vni)
260 /* Look up VNI in a per net namespace table */
261 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
262 sa_family_t family, __be16 port,
265 struct vxlan_sock *vs;
267 vs = vxlan_find_sock(net, family, port, flags);
271 return vxlan_vs_find_vni(vs, vni);
274 /* Fill in neighbour message in skbuff. */
275 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
276 const struct vxlan_fdb *fdb,
277 u32 portid, u32 seq, int type, unsigned int flags,
278 const struct vxlan_rdst *rdst)
280 unsigned long now = jiffies;
281 struct nda_cacheinfo ci;
282 struct nlmsghdr *nlh;
284 bool send_ip, send_eth;
286 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
290 ndm = nlmsg_data(nlh);
291 memset(ndm, 0, sizeof(*ndm));
293 send_eth = send_ip = true;
295 if (type == RTM_GETNEIGH) {
296 ndm->ndm_family = AF_INET;
297 send_ip = !vxlan_addr_any(&rdst->remote_ip);
298 send_eth = !is_zero_ether_addr(fdb->eth_addr);
300 ndm->ndm_family = AF_BRIDGE;
301 ndm->ndm_state = fdb->state;
302 ndm->ndm_ifindex = vxlan->dev->ifindex;
303 ndm->ndm_flags = fdb->flags;
304 ndm->ndm_type = RTN_UNICAST;
306 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
307 nla_put_s32(skb, NDA_LINK_NETNSID,
308 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
309 goto nla_put_failure;
311 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
312 goto nla_put_failure;
314 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
315 goto nla_put_failure;
317 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
318 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
319 goto nla_put_failure;
320 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
321 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
322 goto nla_put_failure;
323 if (rdst->remote_ifindex &&
324 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
325 goto nla_put_failure;
327 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
328 ci.ndm_confirmed = 0;
329 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
332 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
333 goto nla_put_failure;
339 nlmsg_cancel(skb, nlh);
343 static inline size_t vxlan_nlmsg_size(void)
345 return NLMSG_ALIGN(sizeof(struct ndmsg))
346 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
347 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
348 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
349 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
350 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
351 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
352 + nla_total_size(sizeof(struct nda_cacheinfo));
355 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
356 struct vxlan_rdst *rd, int type)
358 struct net *net = dev_net(vxlan->dev);
362 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
366 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
368 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
369 WARN_ON(err == -EMSGSIZE);
374 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
378 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
381 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
383 struct vxlan_dev *vxlan = netdev_priv(dev);
384 struct vxlan_fdb f = {
387 struct vxlan_rdst remote = {
388 .remote_ip = *ipa, /* goes to NDA_DST */
389 .remote_vni = cpu_to_be32(VXLAN_N_VID),
392 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
395 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
397 struct vxlan_fdb f = {
400 struct vxlan_rdst remote = { };
402 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
404 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
407 /* Hash Ethernet address */
408 static u32 eth_hash(const unsigned char *addr)
410 u64 value = get_unaligned((u64 *)addr);
412 /* only want 6 bytes */
418 return hash_64(value, FDB_HASH_BITS);
421 /* Hash chain to use given mac address */
422 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
425 return &vxlan->fdb_head[eth_hash(mac)];
428 /* Look up Ethernet address in forwarding table */
429 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
432 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
435 hlist_for_each_entry_rcu(f, head, hlist) {
436 if (ether_addr_equal(mac, f->eth_addr))
443 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
448 f = __vxlan_find_mac(vxlan, mac);
455 /* caller should hold vxlan->hash_lock */
456 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
457 union vxlan_addr *ip, __be16 port,
458 __be32 vni, __u32 ifindex)
460 struct vxlan_rdst *rd;
462 list_for_each_entry(rd, &f->remotes, list) {
463 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
464 rd->remote_port == port &&
465 rd->remote_vni == vni &&
466 rd->remote_ifindex == ifindex)
473 /* Replace destination of unicast mac */
474 static int vxlan_fdb_replace(struct vxlan_fdb *f,
475 union vxlan_addr *ip, __be16 port, __be32 vni,
478 struct vxlan_rdst *rd;
480 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
484 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
488 dst_cache_reset(&rd->dst_cache);
490 rd->remote_port = port;
491 rd->remote_vni = vni;
492 rd->remote_ifindex = ifindex;
496 /* Add/update destinations for multicast */
497 static int vxlan_fdb_append(struct vxlan_fdb *f,
498 union vxlan_addr *ip, __be16 port, __be32 vni,
499 __u32 ifindex, struct vxlan_rdst **rdp)
501 struct vxlan_rdst *rd;
503 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
507 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
511 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
517 rd->remote_port = port;
518 rd->remote_vni = vni;
519 rd->remote_ifindex = ifindex;
521 list_add_tail_rcu(&rd->list, &f->remotes);
527 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
529 struct vxlanhdr *vh, size_t hdrlen,
531 struct gro_remcsum *grc,
534 size_t start, offset;
536 if (skb->remcsum_offload)
539 if (!NAPI_GRO_CB(skb)->csum_valid)
542 start = vxlan_rco_start(vni_field);
543 offset = start + vxlan_rco_offset(vni_field);
545 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
546 start, offset, grc, nopartial);
548 skb->remcsum_offload = 1;
553 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
554 struct sk_buff **head,
557 struct sk_buff *p, **pp = NULL;
558 struct vxlanhdr *vh, *vh2;
559 unsigned int hlen, off_vx;
561 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
563 struct gro_remcsum grc;
565 skb_gro_remcsum_init(&grc);
567 off_vx = skb_gro_offset(skb);
568 hlen = off_vx + sizeof(*vh);
569 vh = skb_gro_header_fast(skb, off_vx);
570 if (skb_gro_header_hard(skb, hlen)) {
571 vh = skb_gro_header_slow(skb, hlen, off_vx);
576 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
578 flags = vh->vx_flags;
580 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
581 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
584 VXLAN_F_REMCSUM_NOPARTIAL));
590 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
592 for (p = *head; p; p = p->next) {
593 if (!NAPI_GRO_CB(p)->same_flow)
596 vh2 = (struct vxlanhdr *)(p->data + off_vx);
597 if (vh->vx_flags != vh2->vx_flags ||
598 vh->vx_vni != vh2->vx_vni) {
599 NAPI_GRO_CB(p)->same_flow = 0;
604 pp = eth_gro_receive(head, skb);
608 skb_gro_remcsum_cleanup(skb, &grc);
609 NAPI_GRO_CB(skb)->flush |= flush;
614 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
616 udp_tunnel_gro_complete(skb, nhoff);
618 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
621 /* Notify netdevs that UDP port started listening */
622 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
624 struct net_device *dev;
625 struct sock *sk = vs->sock->sk;
626 struct net *net = sock_net(sk);
627 sa_family_t sa_family = vxlan_get_sk_family(vs);
628 __be16 port = inet_sk(sk)->inet_sport;
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,
657 /* Add new entry to forwarding table -- assumes lock held */
658 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
659 const u8 *mac, union vxlan_addr *ip,
660 __u16 state, __u16 flags,
661 __be16 port, __be32 vni, __u32 ifindex,
664 struct vxlan_rdst *rd = NULL;
668 f = __vxlan_find_mac(vxlan, mac);
670 if (flags & NLM_F_EXCL) {
671 netdev_dbg(vxlan->dev,
672 "lost race to create %pM\n", mac);
675 if (f->state != state) {
677 f->updated = jiffies;
680 if (f->flags != ndm_flags) {
681 f->flags = ndm_flags;
682 f->updated = jiffies;
685 if ((flags & NLM_F_REPLACE)) {
686 /* Only change unicasts */
687 if (!(is_multicast_ether_addr(f->eth_addr) ||
688 is_zero_ether_addr(f->eth_addr))) {
689 notify |= vxlan_fdb_replace(f, ip, port, vni,
694 if ((flags & NLM_F_APPEND) &&
695 (is_multicast_ether_addr(f->eth_addr) ||
696 is_zero_ether_addr(f->eth_addr))) {
697 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
705 if (!(flags & NLM_F_CREATE))
708 if (vxlan->cfg.addrmax &&
709 vxlan->addrcnt >= vxlan->cfg.addrmax)
712 /* Disallow replace to add a multicast entry */
713 if ((flags & NLM_F_REPLACE) &&
714 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
717 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
718 f = kmalloc(sizeof(*f), GFP_ATOMIC);
724 f->flags = ndm_flags;
725 f->updated = f->used = jiffies;
726 INIT_LIST_HEAD(&f->remotes);
727 memcpy(f->eth_addr, mac, ETH_ALEN);
729 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
732 hlist_add_head_rcu(&f->hlist,
733 vxlan_fdb_head(vxlan, mac));
738 rd = first_remote_rtnl(f);
739 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
745 static void vxlan_fdb_free(struct rcu_head *head)
747 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
748 struct vxlan_rdst *rd, *nd;
750 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
751 dst_cache_destroy(&rd->dst_cache);
757 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
759 netdev_dbg(vxlan->dev,
760 "delete %pM\n", f->eth_addr);
763 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
765 hlist_del_rcu(&f->hlist);
766 call_rcu(&f->rcu, vxlan_fdb_free);
769 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
770 union vxlan_addr *ip, __be16 *port, __be32 *vni,
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 = cpu_to_be32(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); */
838 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
839 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
844 if (tb[NDA_DST] == NULL)
847 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
851 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
852 return -EAFNOSUPPORT;
854 spin_lock_bh(&vxlan->hash_lock);
855 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
856 port, vni, ifindex, ndm->ndm_flags);
857 spin_unlock_bh(&vxlan->hash_lock);
862 /* Delete entry (via netlink) */
863 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
864 struct net_device *dev,
865 const unsigned char *addr, u16 vid)
867 struct vxlan_dev *vxlan = netdev_priv(dev);
869 struct vxlan_rdst *rd = NULL;
876 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
882 spin_lock_bh(&vxlan->hash_lock);
883 f = vxlan_find_mac(vxlan, addr);
887 if (!vxlan_addr_any(&ip)) {
888 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
895 /* remove a destination if it's not the only one on the list,
896 * otherwise destroy the fdb entry
898 if (rd && !list_is_singular(&f->remotes)) {
899 list_del_rcu(&rd->list);
900 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
905 vxlan_fdb_destroy(vxlan, f);
908 spin_unlock_bh(&vxlan->hash_lock);
913 /* Dump forwarding table */
914 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
915 struct net_device *dev,
916 struct net_device *filter_dev, int idx)
918 struct vxlan_dev *vxlan = netdev_priv(dev);
921 for (h = 0; h < FDB_HASH_SIZE; ++h) {
925 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
926 struct vxlan_rdst *rd;
928 list_for_each_entry_rcu(rd, &f->remotes, list) {
929 if (idx < cb->args[0])
932 err = vxlan_fdb_info(skb, vxlan, f,
933 NETLINK_CB(cb->skb).portid,
950 /* Watch incoming packets to learn mapping between Ethernet address
951 * and Tunnel endpoint.
952 * Return true if packet is bogus and should be dropped.
954 static bool vxlan_snoop(struct net_device *dev,
955 union vxlan_addr *src_ip, const u8 *src_mac)
957 struct vxlan_dev *vxlan = netdev_priv(dev);
960 f = vxlan_find_mac(vxlan, src_mac);
962 struct vxlan_rdst *rdst = first_remote_rcu(f);
964 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
967 /* Don't migrate static entries, drop packets */
968 if (f->state & NUD_NOARP)
973 "%pM migrated from %pIS to %pIS\n",
974 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
976 rdst->remote_ip = *src_ip;
977 f->updated = jiffies;
978 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
980 /* learned new entry */
981 spin_lock(&vxlan->hash_lock);
983 /* close off race between vxlan_flush and incoming packets */
984 if (netif_running(dev))
985 vxlan_fdb_create(vxlan, src_mac, src_ip,
987 NLM_F_EXCL|NLM_F_CREATE,
989 vxlan->default_dst.remote_vni,
991 spin_unlock(&vxlan->hash_lock);
997 /* See if multicast group is already in use by other ID */
998 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1000 struct vxlan_dev *vxlan;
1001 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1003 /* The vxlan_sock is only used by dev, leaving group has
1004 * no effect on other vxlan devices.
1006 if (family == AF_INET && dev->vn4_sock &&
1007 atomic_read(&dev->vn4_sock->refcnt) == 1)
1009 #if IS_ENABLED(CONFIG_IPV6)
1010 if (family == AF_INET6 && dev->vn6_sock &&
1011 atomic_read(&dev->vn6_sock->refcnt) == 1)
1015 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1016 if (!netif_running(vxlan->dev) || vxlan == dev)
1019 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1021 #if IS_ENABLED(CONFIG_IPV6)
1022 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1026 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1027 &dev->default_dst.remote_ip))
1030 if (vxlan->default_dst.remote_ifindex !=
1031 dev->default_dst.remote_ifindex)
1040 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1042 struct vxlan_net *vn;
1046 if (!atomic_dec_and_test(&vs->refcnt))
1049 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1050 spin_lock(&vn->sock_lock);
1051 hlist_del_rcu(&vs->hlist);
1052 vxlan_notify_del_rx_port(vs);
1053 spin_unlock(&vn->sock_lock);
1058 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1060 bool ipv4 = __vxlan_sock_release_prep(vxlan->vn4_sock);
1061 #if IS_ENABLED(CONFIG_IPV6)
1062 bool ipv6 = __vxlan_sock_release_prep(vxlan->vn6_sock);
1068 udp_tunnel_sock_release(vxlan->vn4_sock->sock);
1069 kfree(vxlan->vn4_sock);
1072 #if IS_ENABLED(CONFIG_IPV6)
1074 udp_tunnel_sock_release(vxlan->vn6_sock->sock);
1075 kfree(vxlan->vn6_sock);
1080 /* Update multicast group membership when first VNI on
1081 * multicast address is brought up
1083 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1086 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1087 int ifindex = vxlan->default_dst.remote_ifindex;
1090 if (ip->sa.sa_family == AF_INET) {
1091 struct ip_mreqn mreq = {
1092 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1093 .imr_ifindex = ifindex,
1096 sk = vxlan->vn4_sock->sock->sk;
1098 ret = ip_mc_join_group(sk, &mreq);
1100 #if IS_ENABLED(CONFIG_IPV6)
1102 sk = vxlan->vn6_sock->sock->sk;
1104 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1105 &ip->sin6.sin6_addr);
1113 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1114 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1117 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1118 int ifindex = vxlan->default_dst.remote_ifindex;
1121 if (ip->sa.sa_family == AF_INET) {
1122 struct ip_mreqn mreq = {
1123 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1124 .imr_ifindex = ifindex,
1127 sk = vxlan->vn4_sock->sock->sk;
1129 ret = ip_mc_leave_group(sk, &mreq);
1131 #if IS_ENABLED(CONFIG_IPV6)
1133 sk = vxlan->vn6_sock->sock->sk;
1135 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1136 &ip->sin6.sin6_addr);
1144 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1145 struct sk_buff *skb, u32 vxflags)
1147 size_t start, offset;
1149 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1152 start = vxlan_rco_start(unparsed->vx_vni);
1153 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1155 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1158 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1159 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1161 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1162 unparsed->vx_vni &= VXLAN_VNI_MASK;
1166 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1167 struct sk_buff *skb, u32 vxflags,
1168 struct vxlan_metadata *md)
1170 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1171 struct metadata_dst *tun_dst;
1173 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1176 md->gbp = ntohs(gbp->policy_id);
1178 tun_dst = (struct metadata_dst *)skb_dst(skb);
1180 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1181 tun_dst->u.tun_info.options_len = sizeof(*md);
1183 if (gbp->dont_learn)
1184 md->gbp |= VXLAN_GBP_DONT_LEARN;
1186 if (gbp->policy_applied)
1187 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1189 /* In flow-based mode, GBP is carried in dst_metadata */
1190 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1191 skb->mark = md->gbp;
1193 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1196 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1198 struct sk_buff *skb, u32 vxflags)
1200 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1202 /* Need to have Next Protocol set for interfaces in GPE mode. */
1203 if (!gpe->np_applied)
1205 /* "The initial version is 0. If a receiver does not support the
1206 * version indicated it MUST drop the packet.
1208 if (gpe->version != 0)
1210 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1211 * processing MUST occur." However, we don't implement OAM
1212 * processing, thus drop the packet.
1217 switch (gpe->next_protocol) {
1218 case VXLAN_GPE_NP_IPV4:
1219 *protocol = htons(ETH_P_IP);
1221 case VXLAN_GPE_NP_IPV6:
1222 *protocol = htons(ETH_P_IPV6);
1224 case VXLAN_GPE_NP_ETHERNET:
1225 *protocol = htons(ETH_P_TEB);
1231 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1235 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1236 struct vxlan_sock *vs,
1237 struct sk_buff *skb)
1239 union vxlan_addr saddr;
1241 skb_reset_mac_header(skb);
1242 skb->protocol = eth_type_trans(skb, vxlan->dev);
1243 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1245 /* Ignore packet loops (and multicast echo) */
1246 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1249 /* Get address from the outer IP header */
1250 if (vxlan_get_sk_family(vs) == AF_INET) {
1251 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1252 saddr.sa.sa_family = AF_INET;
1253 #if IS_ENABLED(CONFIG_IPV6)
1255 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1256 saddr.sa.sa_family = AF_INET6;
1260 if ((vxlan->flags & VXLAN_F_LEARN) &&
1261 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1267 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1268 struct sk_buff *skb)
1272 if (vxlan_get_sk_family(vs) == AF_INET)
1273 err = IP_ECN_decapsulate(oiph, skb);
1274 #if IS_ENABLED(CONFIG_IPV6)
1276 err = IP6_ECN_decapsulate(oiph, skb);
1279 if (unlikely(err) && log_ecn_error) {
1280 if (vxlan_get_sk_family(vs) == AF_INET)
1281 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1282 &((struct iphdr *)oiph)->saddr,
1283 ((struct iphdr *)oiph)->tos);
1285 net_info_ratelimited("non-ECT from %pI6\n",
1286 &((struct ipv6hdr *)oiph)->saddr);
1291 /* Callback from net/ipv4/udp.c to receive packets */
1292 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1294 struct pcpu_sw_netstats *stats;
1295 struct vxlan_dev *vxlan;
1296 struct vxlan_sock *vs;
1297 struct vxlanhdr unparsed;
1298 struct vxlan_metadata _md;
1299 struct vxlan_metadata *md = &_md;
1300 __be16 protocol = htons(ETH_P_TEB);
1301 bool raw_proto = false;
1304 /* Need UDP and VXLAN header to be present */
1305 if (!pskb_may_pull(skb, VXLAN_HLEN))
1308 unparsed = *vxlan_hdr(skb);
1309 /* VNI flag always required to be set */
1310 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1311 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1312 ntohl(vxlan_hdr(skb)->vx_flags),
1313 ntohl(vxlan_hdr(skb)->vx_vni));
1314 /* Return non vxlan pkt */
1317 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1318 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1320 vs = rcu_dereference_sk_user_data(sk);
1324 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1328 /* For backwards compatibility, only allow reserved fields to be
1329 * used by VXLAN extensions if explicitly requested.
1331 if (vs->flags & VXLAN_F_GPE) {
1332 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1337 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1338 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1341 if (vxlan_collect_metadata(vs)) {
1342 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1343 struct metadata_dst *tun_dst;
1345 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1346 vxlan_vni_to_tun_id(vni), sizeof(*md));
1351 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1353 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1355 memset(md, 0, sizeof(*md));
1358 if (vs->flags & VXLAN_F_REMCSUM_RX)
1359 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1361 if (vs->flags & VXLAN_F_GBP)
1362 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1363 /* Note that GBP and GPE can never be active together. This is
1364 * ensured in vxlan_dev_configure.
1367 if (unparsed.vx_flags || unparsed.vx_vni) {
1368 /* If there are any unprocessed flags remaining treat
1369 * this as a malformed packet. This behavior diverges from
1370 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1371 * in reserved fields are to be ignored. The approach here
1372 * maintains compatibility with previous stack code, and also
1373 * is more robust and provides a little more security in
1374 * adding extensions to VXLAN.
1380 if (!vxlan_set_mac(vxlan, vs, skb))
1383 skb->dev = vxlan->dev;
1384 skb->pkt_type = PACKET_HOST;
1387 oiph = skb_network_header(skb);
1388 skb_reset_network_header(skb);
1390 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1391 ++vxlan->dev->stats.rx_frame_errors;
1392 ++vxlan->dev->stats.rx_errors;
1396 stats = this_cpu_ptr(vxlan->dev->tstats);
1397 u64_stats_update_begin(&stats->syncp);
1398 stats->rx_packets++;
1399 stats->rx_bytes += skb->len;
1400 u64_stats_update_end(&stats->syncp);
1402 gro_cells_receive(&vxlan->gro_cells, skb);
1406 /* Consume bad packet */
1411 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1413 struct vxlan_dev *vxlan = netdev_priv(dev);
1414 struct arphdr *parp;
1417 struct neighbour *n;
1419 if (dev->flags & IFF_NOARP)
1422 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1423 dev->stats.tx_dropped++;
1426 parp = arp_hdr(skb);
1428 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1429 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1430 parp->ar_pro != htons(ETH_P_IP) ||
1431 parp->ar_op != htons(ARPOP_REQUEST) ||
1432 parp->ar_hln != dev->addr_len ||
1435 arpptr = (u8 *)parp + sizeof(struct arphdr);
1437 arpptr += dev->addr_len; /* sha */
1438 memcpy(&sip, arpptr, sizeof(sip));
1439 arpptr += sizeof(sip);
1440 arpptr += dev->addr_len; /* tha */
1441 memcpy(&tip, arpptr, sizeof(tip));
1443 if (ipv4_is_loopback(tip) ||
1444 ipv4_is_multicast(tip))
1447 n = neigh_lookup(&arp_tbl, &tip, dev);
1450 struct vxlan_fdb *f;
1451 struct sk_buff *reply;
1453 if (!(n->nud_state & NUD_CONNECTED)) {
1458 f = vxlan_find_mac(vxlan, n->ha);
1459 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1460 /* bridge-local neighbor */
1465 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1473 skb_reset_mac_header(reply);
1474 __skb_pull(reply, skb_network_offset(reply));
1475 reply->ip_summed = CHECKSUM_UNNECESSARY;
1476 reply->pkt_type = PACKET_HOST;
1478 if (netif_rx_ni(reply) == NET_RX_DROP)
1479 dev->stats.rx_dropped++;
1480 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1481 union vxlan_addr ipa = {
1482 .sin.sin_addr.s_addr = tip,
1483 .sin.sin_family = AF_INET,
1486 vxlan_ip_miss(dev, &ipa);
1490 return NETDEV_TX_OK;
1493 #if IS_ENABLED(CONFIG_IPV6)
1494 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1495 struct neighbour *n, bool isrouter)
1497 struct net_device *dev = request->dev;
1498 struct sk_buff *reply;
1499 struct nd_msg *ns, *na;
1500 struct ipv6hdr *pip6;
1502 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1509 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1510 sizeof(*na) + na_olen + dev->needed_tailroom;
1511 reply = alloc_skb(len, GFP_ATOMIC);
1515 reply->protocol = htons(ETH_P_IPV6);
1517 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1518 skb_push(reply, sizeof(struct ethhdr));
1519 skb_reset_mac_header(reply);
1521 ns = (struct nd_msg *)skb_transport_header(request);
1523 daddr = eth_hdr(request)->h_source;
1524 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1525 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1526 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1527 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1532 /* Ethernet header */
1533 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1534 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1535 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1536 reply->protocol = htons(ETH_P_IPV6);
1538 skb_pull(reply, sizeof(struct ethhdr));
1539 skb_reset_network_header(reply);
1540 skb_put(reply, sizeof(struct ipv6hdr));
1544 pip6 = ipv6_hdr(reply);
1545 memset(pip6, 0, sizeof(struct ipv6hdr));
1547 pip6->priority = ipv6_hdr(request)->priority;
1548 pip6->nexthdr = IPPROTO_ICMPV6;
1549 pip6->hop_limit = 255;
1550 pip6->daddr = ipv6_hdr(request)->saddr;
1551 pip6->saddr = *(struct in6_addr *)n->primary_key;
1553 skb_pull(reply, sizeof(struct ipv6hdr));
1554 skb_reset_transport_header(reply);
1556 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1558 /* Neighbor Advertisement */
1559 memset(na, 0, sizeof(*na)+na_olen);
1560 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1561 na->icmph.icmp6_router = isrouter;
1562 na->icmph.icmp6_override = 1;
1563 na->icmph.icmp6_solicited = 1;
1564 na->target = ns->target;
1565 ether_addr_copy(&na->opt[2], n->ha);
1566 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1567 na->opt[1] = na_olen >> 3;
1569 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1570 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1571 csum_partial(na, sizeof(*na)+na_olen, 0));
1573 pip6->payload_len = htons(sizeof(*na)+na_olen);
1575 skb_push(reply, sizeof(struct ipv6hdr));
1577 reply->ip_summed = CHECKSUM_UNNECESSARY;
1582 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1584 struct vxlan_dev *vxlan = netdev_priv(dev);
1586 const struct ipv6hdr *iphdr;
1587 const struct in6_addr *saddr, *daddr;
1588 struct neighbour *n;
1589 struct inet6_dev *in6_dev;
1591 in6_dev = __in6_dev_get(dev);
1595 iphdr = ipv6_hdr(skb);
1596 saddr = &iphdr->saddr;
1597 daddr = &iphdr->daddr;
1599 msg = (struct nd_msg *)skb_transport_header(skb);
1600 if (msg->icmph.icmp6_code != 0 ||
1601 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1604 if (ipv6_addr_loopback(daddr) ||
1605 ipv6_addr_is_multicast(&msg->target))
1608 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1611 struct vxlan_fdb *f;
1612 struct sk_buff *reply;
1614 if (!(n->nud_state & NUD_CONNECTED)) {
1619 f = vxlan_find_mac(vxlan, n->ha);
1620 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1621 /* bridge-local neighbor */
1626 reply = vxlan_na_create(skb, n,
1627 !!(f ? f->flags & NTF_ROUTER : 0));
1634 if (netif_rx_ni(reply) == NET_RX_DROP)
1635 dev->stats.rx_dropped++;
1637 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1638 union vxlan_addr ipa = {
1639 .sin6.sin6_addr = msg->target,
1640 .sin6.sin6_family = AF_INET6,
1643 vxlan_ip_miss(dev, &ipa);
1648 return NETDEV_TX_OK;
1652 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1654 struct vxlan_dev *vxlan = netdev_priv(dev);
1655 struct neighbour *n;
1657 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1661 switch (ntohs(eth_hdr(skb)->h_proto)) {
1666 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1669 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1670 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1671 union vxlan_addr ipa = {
1672 .sin.sin_addr.s_addr = pip->daddr,
1673 .sin.sin_family = AF_INET,
1676 vxlan_ip_miss(dev, &ipa);
1682 #if IS_ENABLED(CONFIG_IPV6)
1685 struct ipv6hdr *pip6;
1687 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1689 pip6 = ipv6_hdr(skb);
1690 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1691 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1692 union vxlan_addr ipa = {
1693 .sin6.sin6_addr = pip6->daddr,
1694 .sin6.sin6_family = AF_INET6,
1697 vxlan_ip_miss(dev, &ipa);
1711 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1713 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1715 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1724 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1725 struct vxlan_metadata *md)
1727 struct vxlanhdr_gbp *gbp;
1732 gbp = (struct vxlanhdr_gbp *)vxh;
1733 vxh->vx_flags |= VXLAN_HF_GBP;
1735 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1736 gbp->dont_learn = 1;
1738 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1739 gbp->policy_applied = 1;
1741 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1744 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1747 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1749 gpe->np_applied = 1;
1752 case htons(ETH_P_IP):
1753 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1755 case htons(ETH_P_IPV6):
1756 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1758 case htons(ETH_P_TEB):
1759 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1762 return -EPFNOSUPPORT;
1765 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1766 int iphdr_len, __be32 vni,
1767 struct vxlan_metadata *md, u32 vxflags,
1770 struct vxlanhdr *vxh;
1773 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1774 __be16 inner_protocol = htons(ETH_P_TEB);
1776 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1777 skb->ip_summed == CHECKSUM_PARTIAL) {
1778 int csum_start = skb_checksum_start_offset(skb);
1780 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1781 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1782 (skb->csum_offset == offsetof(struct udphdr, check) ||
1783 skb->csum_offset == offsetof(struct tcphdr, check)))
1784 type |= SKB_GSO_TUNNEL_REMCSUM;
1787 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1788 + VXLAN_HLEN + iphdr_len
1789 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1791 /* Need space for new headers (invalidates iph ptr) */
1792 err = skb_cow_head(skb, min_headroom);
1796 skb = vlan_hwaccel_push_inside(skb);
1800 err = iptunnel_handle_offloads(skb, type);
1804 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1805 vxh->vx_flags = VXLAN_HF_VNI;
1806 vxh->vx_vni = vxlan_vni_field(vni);
1808 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1811 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1812 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1813 vxh->vx_flags |= VXLAN_HF_RCO;
1815 if (!skb_is_gso(skb)) {
1816 skb->ip_summed = CHECKSUM_NONE;
1817 skb->encapsulation = 0;
1821 if (vxflags & VXLAN_F_GBP)
1822 vxlan_build_gbp_hdr(vxh, vxflags, md);
1823 if (vxflags & VXLAN_F_GPE) {
1824 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1827 inner_protocol = skb->protocol;
1830 skb_set_inner_protocol(skb, inner_protocol);
1838 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1839 struct sk_buff *skb, int oif, u8 tos,
1840 __be32 daddr, __be32 *saddr,
1841 struct dst_cache *dst_cache,
1842 const struct ip_tunnel_info *info)
1844 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1845 struct rtable *rt = NULL;
1851 rt = dst_cache_get_ip4(dst_cache, saddr);
1856 memset(&fl4, 0, sizeof(fl4));
1857 fl4.flowi4_oif = oif;
1858 fl4.flowi4_tos = RT_TOS(tos);
1859 fl4.flowi4_mark = skb->mark;
1860 fl4.flowi4_proto = IPPROTO_UDP;
1862 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1864 rt = ip_route_output_key(vxlan->net, &fl4);
1868 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1873 #if IS_ENABLED(CONFIG_IPV6)
1874 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1875 struct sk_buff *skb, int oif, u8 tos,
1877 const struct in6_addr *daddr,
1878 struct in6_addr *saddr,
1879 struct dst_cache *dst_cache,
1880 const struct ip_tunnel_info *info)
1882 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1883 struct dst_entry *ndst;
1890 ndst = dst_cache_get_ip6(dst_cache, saddr);
1895 memset(&fl6, 0, sizeof(fl6));
1896 fl6.flowi6_oif = oif;
1898 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1899 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1900 fl6.flowi6_mark = skb->mark;
1901 fl6.flowi6_proto = IPPROTO_UDP;
1903 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1904 vxlan->vn6_sock->sock->sk,
1907 return ERR_PTR(err);
1911 dst_cache_set_ip6(dst_cache, ndst, saddr);
1916 /* Bypass encapsulation if the destination is local */
1917 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1918 struct vxlan_dev *dst_vxlan)
1920 struct pcpu_sw_netstats *tx_stats, *rx_stats;
1921 union vxlan_addr loopback;
1922 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1923 struct net_device *dev = skb->dev;
1926 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1927 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1928 skb->pkt_type = PACKET_HOST;
1929 skb->encapsulation = 0;
1930 skb->dev = dst_vxlan->dev;
1931 __skb_pull(skb, skb_network_offset(skb));
1933 if (remote_ip->sa.sa_family == AF_INET) {
1934 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1935 loopback.sa.sa_family = AF_INET;
1936 #if IS_ENABLED(CONFIG_IPV6)
1938 loopback.sin6.sin6_addr = in6addr_loopback;
1939 loopback.sa.sa_family = AF_INET6;
1943 if (dst_vxlan->flags & VXLAN_F_LEARN)
1944 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1946 u64_stats_update_begin(&tx_stats->syncp);
1947 tx_stats->tx_packets++;
1948 tx_stats->tx_bytes += len;
1949 u64_stats_update_end(&tx_stats->syncp);
1951 if (netif_rx(skb) == NET_RX_SUCCESS) {
1952 u64_stats_update_begin(&rx_stats->syncp);
1953 rx_stats->rx_packets++;
1954 rx_stats->rx_bytes += len;
1955 u64_stats_update_end(&rx_stats->syncp);
1957 dev->stats.rx_dropped++;
1961 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1962 struct vxlan_rdst *rdst, bool did_rsc)
1964 struct dst_cache *dst_cache;
1965 struct ip_tunnel_info *info;
1966 struct vxlan_dev *vxlan = netdev_priv(dev);
1968 struct rtable *rt = NULL;
1969 const struct iphdr *old_iph;
1970 union vxlan_addr *dst;
1971 union vxlan_addr remote_ip;
1972 struct vxlan_metadata _md;
1973 struct vxlan_metadata *md = &_md;
1974 __be16 src_port = 0, dst_port;
1979 u32 flags = vxlan->flags;
1980 bool udp_sum = false;
1981 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1983 info = skb_tunnel_info(skb);
1986 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1987 vni = rdst->remote_vni;
1988 dst = &rdst->remote_ip;
1989 dst_cache = &rdst->dst_cache;
1992 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1996 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1997 vni = vxlan_tun_id_to_vni(info->key.tun_id);
1998 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1999 if (remote_ip.sa.sa_family == AF_INET)
2000 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2002 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2004 dst_cache = &info->dst_cache;
2007 if (vxlan_addr_any(dst)) {
2009 /* short-circuited back to local bridge */
2010 vxlan_encap_bypass(skb, vxlan, vxlan);
2016 old_iph = ip_hdr(skb);
2018 ttl = vxlan->cfg.ttl;
2019 if (!ttl && vxlan_addr_multicast(dst))
2022 tos = vxlan->cfg.tos;
2024 tos = ip_tunnel_get_dsfield(old_iph, skb);
2026 label = vxlan->cfg.label;
2027 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2028 vxlan->cfg.port_max, true);
2031 ttl = info->key.ttl;
2032 tos = info->key.tos;
2033 label = info->key.label;
2034 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2036 if (info->options_len)
2037 md = ip_tunnel_info_opts(info);
2039 md->gbp = skb->mark;
2042 if (dst->sa.sa_family == AF_INET) {
2045 if (!vxlan->vn4_sock)
2047 sk = vxlan->vn4_sock->sock->sk;
2049 rt = vxlan_get_route(vxlan, skb,
2050 rdst ? rdst->remote_ifindex : 0, tos,
2051 dst->sin.sin_addr.s_addr, &saddr,
2054 netdev_dbg(dev, "no route to %pI4\n",
2055 &dst->sin.sin_addr.s_addr);
2056 dev->stats.tx_carrier_errors++;
2060 if (rt->dst.dev == dev) {
2061 netdev_dbg(dev, "circular route to %pI4\n",
2062 &dst->sin.sin_addr.s_addr);
2063 dev->stats.collisions++;
2067 /* Bypass encapsulation if the destination is local */
2068 if (rt->rt_flags & RTCF_LOCAL &&
2069 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2070 struct vxlan_dev *dst_vxlan;
2073 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2074 dst->sa.sa_family, dst_port,
2078 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2083 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2084 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2087 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2088 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2089 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2090 vni, md, flags, udp_sum);
2094 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2095 dst->sin.sin_addr.s_addr, tos, ttl, df,
2096 src_port, dst_port, xnet, !udp_sum);
2097 #if IS_ENABLED(CONFIG_IPV6)
2099 struct dst_entry *ndst;
2100 struct in6_addr saddr;
2103 if (!vxlan->vn6_sock)
2105 sk = vxlan->vn6_sock->sock->sk;
2107 ndst = vxlan6_get_route(vxlan, skb,
2108 rdst ? rdst->remote_ifindex : 0, tos,
2109 label, &dst->sin6.sin6_addr, &saddr,
2112 netdev_dbg(dev, "no route to %pI6\n",
2113 &dst->sin6.sin6_addr);
2114 dev->stats.tx_carrier_errors++;
2118 if (ndst->dev == dev) {
2119 netdev_dbg(dev, "circular route to %pI6\n",
2120 &dst->sin6.sin6_addr);
2122 dev->stats.collisions++;
2126 /* Bypass encapsulation if the destination is local */
2127 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2128 if (rt6i_flags & RTF_LOCAL &&
2129 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2130 struct vxlan_dev *dst_vxlan;
2133 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2134 dst->sa.sa_family, dst_port,
2138 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2143 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2145 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2146 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2147 skb_scrub_packet(skb, xnet);
2148 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2149 vni, md, flags, udp_sum);
2154 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2155 &saddr, &dst->sin6.sin6_addr, tos, ttl,
2156 label, src_port, dst_port, !udp_sum);
2163 dev->stats.tx_dropped++;
2167 /* skb is already freed. */
2172 dev->stats.tx_errors++;
2177 /* Transmit local packets over Vxlan
2179 * Outer IP header inherits ECN and DF from inner header.
2180 * Outer UDP destination is the VXLAN assigned port.
2181 * source port is based on hash of flow
2183 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2185 struct vxlan_dev *vxlan = netdev_priv(dev);
2186 const struct ip_tunnel_info *info;
2188 bool did_rsc = false;
2189 struct vxlan_rdst *rdst, *fdst = NULL;
2190 struct vxlan_fdb *f;
2192 info = skb_tunnel_info(skb);
2194 skb_reset_mac_header(skb);
2196 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2197 if (info && info->mode & IP_TUNNEL_INFO_TX)
2198 vxlan_xmit_one(skb, dev, NULL, false);
2201 return NETDEV_TX_OK;
2204 if (vxlan->flags & VXLAN_F_PROXY) {
2206 if (ntohs(eth->h_proto) == ETH_P_ARP)
2207 return arp_reduce(dev, skb);
2208 #if IS_ENABLED(CONFIG_IPV6)
2209 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2210 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2211 + sizeof(struct nd_msg)) &&
2212 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2215 msg = (struct nd_msg *)skb_transport_header(skb);
2216 if (msg->icmph.icmp6_code == 0 &&
2217 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2218 return neigh_reduce(dev, skb);
2224 f = vxlan_find_mac(vxlan, eth->h_dest);
2227 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2228 (ntohs(eth->h_proto) == ETH_P_IP ||
2229 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2230 did_rsc = route_shortcircuit(dev, skb);
2232 f = vxlan_find_mac(vxlan, eth->h_dest);
2236 f = vxlan_find_mac(vxlan, all_zeros_mac);
2238 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2239 !is_multicast_ether_addr(eth->h_dest))
2240 vxlan_fdb_miss(vxlan, eth->h_dest);
2242 dev->stats.tx_dropped++;
2244 return NETDEV_TX_OK;
2248 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2249 struct sk_buff *skb1;
2255 skb1 = skb_clone(skb, GFP_ATOMIC);
2257 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2261 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2264 return NETDEV_TX_OK;
2267 /* Walk the forwarding table and purge stale entries */
2268 static void vxlan_cleanup(unsigned long arg)
2270 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2271 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2274 if (!netif_running(vxlan->dev))
2277 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2278 struct hlist_node *p, *n;
2280 spin_lock_bh(&vxlan->hash_lock);
2281 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2283 = container_of(p, struct vxlan_fdb, hlist);
2284 unsigned long timeout;
2286 if (f->state & NUD_PERMANENT)
2289 timeout = f->used + vxlan->cfg.age_interval * HZ;
2290 if (time_before_eq(timeout, jiffies)) {
2291 netdev_dbg(vxlan->dev,
2292 "garbage collect %pM\n",
2294 f->state = NUD_STALE;
2295 vxlan_fdb_destroy(vxlan, f);
2296 } else if (time_before(timeout, next_timer))
2297 next_timer = timeout;
2299 spin_unlock_bh(&vxlan->hash_lock);
2302 mod_timer(&vxlan->age_timer, next_timer);
2305 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2307 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2308 __be32 vni = vxlan->default_dst.remote_vni;
2310 spin_lock(&vn->sock_lock);
2311 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2312 spin_unlock(&vn->sock_lock);
2315 /* Setup stats when device is created */
2316 static int vxlan_init(struct net_device *dev)
2318 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2325 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2327 struct vxlan_fdb *f;
2329 spin_lock_bh(&vxlan->hash_lock);
2330 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2332 vxlan_fdb_destroy(vxlan, f);
2333 spin_unlock_bh(&vxlan->hash_lock);
2336 static void vxlan_uninit(struct net_device *dev)
2338 struct vxlan_dev *vxlan = netdev_priv(dev);
2340 vxlan_fdb_delete_default(vxlan);
2342 free_percpu(dev->tstats);
2345 /* Start ageing timer and join group when device is brought up */
2346 static int vxlan_open(struct net_device *dev)
2348 struct vxlan_dev *vxlan = netdev_priv(dev);
2351 ret = vxlan_sock_add(vxlan);
2355 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2356 ret = vxlan_igmp_join(vxlan);
2357 if (ret == -EADDRINUSE)
2360 vxlan_sock_release(vxlan);
2365 if (vxlan->cfg.age_interval)
2366 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2371 /* Purge the forwarding table */
2372 static void vxlan_flush(struct vxlan_dev *vxlan)
2376 spin_lock_bh(&vxlan->hash_lock);
2377 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2378 struct hlist_node *p, *n;
2379 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2381 = container_of(p, struct vxlan_fdb, hlist);
2382 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2383 if (!is_zero_ether_addr(f->eth_addr))
2384 vxlan_fdb_destroy(vxlan, f);
2387 spin_unlock_bh(&vxlan->hash_lock);
2390 /* Cleanup timer and forwarding table on shutdown */
2391 static int vxlan_stop(struct net_device *dev)
2393 struct vxlan_dev *vxlan = netdev_priv(dev);
2394 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2397 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2398 !vxlan_group_used(vn, vxlan))
2399 ret = vxlan_igmp_leave(vxlan);
2401 del_timer_sync(&vxlan->age_timer);
2404 vxlan_sock_release(vxlan);
2409 /* Stub, nothing needs to be done. */
2410 static void vxlan_set_multicast_list(struct net_device *dev)
2414 static int __vxlan_change_mtu(struct net_device *dev,
2415 struct net_device *lowerdev,
2416 struct vxlan_rdst *dst, int new_mtu, bool strict)
2418 int max_mtu = IP_MAX_MTU;
2421 max_mtu = lowerdev->mtu;
2423 if (dst->remote_ip.sa.sa_family == AF_INET6)
2424 max_mtu -= VXLAN6_HEADROOM;
2426 max_mtu -= VXLAN_HEADROOM;
2431 if (new_mtu > max_mtu) {
2442 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2444 struct vxlan_dev *vxlan = netdev_priv(dev);
2445 struct vxlan_rdst *dst = &vxlan->default_dst;
2446 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2447 dst->remote_ifindex);
2448 return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2451 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2453 struct vxlan_dev *vxlan = netdev_priv(dev);
2454 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2455 __be16 sport, dport;
2457 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2458 vxlan->cfg.port_max, true);
2459 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2461 if (ip_tunnel_info_af(info) == AF_INET) {
2464 if (!vxlan->vn4_sock)
2466 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2467 info->key.u.ipv4.dst,
2468 &info->key.u.ipv4.src, NULL, info);
2473 #if IS_ENABLED(CONFIG_IPV6)
2474 struct dst_entry *ndst;
2476 if (!vxlan->vn6_sock)
2478 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
2479 info->key.label, &info->key.u.ipv6.dst,
2480 &info->key.u.ipv6.src, NULL, info);
2482 return PTR_ERR(ndst);
2484 #else /* !CONFIG_IPV6 */
2485 return -EPFNOSUPPORT;
2488 info->key.tp_src = sport;
2489 info->key.tp_dst = dport;
2493 static const struct net_device_ops vxlan_netdev_ether_ops = {
2494 .ndo_init = vxlan_init,
2495 .ndo_uninit = vxlan_uninit,
2496 .ndo_open = vxlan_open,
2497 .ndo_stop = vxlan_stop,
2498 .ndo_start_xmit = vxlan_xmit,
2499 .ndo_get_stats64 = ip_tunnel_get_stats64,
2500 .ndo_set_rx_mode = vxlan_set_multicast_list,
2501 .ndo_change_mtu = vxlan_change_mtu,
2502 .ndo_validate_addr = eth_validate_addr,
2503 .ndo_set_mac_address = eth_mac_addr,
2504 .ndo_fdb_add = vxlan_fdb_add,
2505 .ndo_fdb_del = vxlan_fdb_delete,
2506 .ndo_fdb_dump = vxlan_fdb_dump,
2507 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2510 static const struct net_device_ops vxlan_netdev_raw_ops = {
2511 .ndo_init = vxlan_init,
2512 .ndo_uninit = vxlan_uninit,
2513 .ndo_open = vxlan_open,
2514 .ndo_stop = vxlan_stop,
2515 .ndo_start_xmit = vxlan_xmit,
2516 .ndo_get_stats64 = ip_tunnel_get_stats64,
2517 .ndo_change_mtu = vxlan_change_mtu,
2518 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2521 /* Info for udev, that this is a virtual tunnel endpoint */
2522 static struct device_type vxlan_type = {
2526 /* Calls the ndo_add_vxlan_port of the caller in order to
2527 * supply the listening VXLAN udp ports. Callers are expected
2528 * to implement the ndo_add_vxlan_port.
2530 void vxlan_get_rx_port(struct net_device *dev)
2532 struct vxlan_sock *vs;
2533 struct net *net = dev_net(dev);
2534 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2535 sa_family_t sa_family;
2539 spin_lock(&vn->sock_lock);
2540 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2541 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2542 port = inet_sk(vs->sock->sk)->inet_sport;
2543 sa_family = vxlan_get_sk_family(vs);
2544 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2548 spin_unlock(&vn->sock_lock);
2550 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2552 /* Initialize the device structure. */
2553 static void vxlan_setup(struct net_device *dev)
2555 struct vxlan_dev *vxlan = netdev_priv(dev);
2558 dev->destructor = free_netdev;
2559 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2561 dev->features |= NETIF_F_LLTX;
2562 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2563 dev->features |= NETIF_F_RXCSUM;
2564 dev->features |= NETIF_F_GSO_SOFTWARE;
2566 dev->vlan_features = dev->features;
2567 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2568 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2569 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2570 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2571 netif_keep_dst(dev);
2572 dev->priv_flags |= IFF_NO_QUEUE;
2574 INIT_LIST_HEAD(&vxlan->next);
2575 spin_lock_init(&vxlan->hash_lock);
2577 init_timer_deferrable(&vxlan->age_timer);
2578 vxlan->age_timer.function = vxlan_cleanup;
2579 vxlan->age_timer.data = (unsigned long) vxlan;
2581 vxlan->cfg.dst_port = htons(vxlan_port);
2585 gro_cells_init(&vxlan->gro_cells, dev);
2587 for (h = 0; h < FDB_HASH_SIZE; ++h)
2588 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2591 static void vxlan_ether_setup(struct net_device *dev)
2593 eth_hw_addr_random(dev);
2595 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2596 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2597 dev->netdev_ops = &vxlan_netdev_ether_ops;
2600 static void vxlan_raw_setup(struct net_device *dev)
2602 dev->type = ARPHRD_NONE;
2603 dev->hard_header_len = 0;
2605 dev->mtu = ETH_DATA_LEN;
2606 dev->tx_queue_len = 1000;
2607 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2608 dev->netdev_ops = &vxlan_netdev_raw_ops;
2611 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2612 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2613 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2614 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2615 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2616 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2617 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2618 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2619 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2620 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2621 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2622 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2623 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2624 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2625 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2626 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2627 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2628 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2629 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2630 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2631 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2632 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2633 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2634 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2635 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2636 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2637 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2638 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2641 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2643 if (tb[IFLA_ADDRESS]) {
2644 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2645 pr_debug("invalid link address (not ethernet)\n");
2649 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2650 pr_debug("invalid all zero ethernet address\n");
2651 return -EADDRNOTAVAIL;
2658 if (data[IFLA_VXLAN_ID]) {
2659 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2660 if (id >= VXLAN_VID_MASK)
2664 if (data[IFLA_VXLAN_PORT_RANGE]) {
2665 const struct ifla_vxlan_port_range *p
2666 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2668 if (ntohs(p->high) < ntohs(p->low)) {
2669 pr_debug("port range %u .. %u not valid\n",
2670 ntohs(p->low), ntohs(p->high));
2678 static void vxlan_get_drvinfo(struct net_device *netdev,
2679 struct ethtool_drvinfo *drvinfo)
2681 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2682 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2685 static const struct ethtool_ops vxlan_ethtool_ops = {
2686 .get_drvinfo = vxlan_get_drvinfo,
2687 .get_link = ethtool_op_get_link,
2690 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2691 __be16 port, u32 flags)
2693 struct socket *sock;
2694 struct udp_port_cfg udp_conf;
2697 memset(&udp_conf, 0, sizeof(udp_conf));
2700 udp_conf.family = AF_INET6;
2701 udp_conf.use_udp6_rx_checksums =
2702 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2703 udp_conf.ipv6_v6only = 1;
2705 udp_conf.family = AF_INET;
2708 udp_conf.local_udp_port = port;
2710 /* Open UDP socket */
2711 err = udp_sock_create(net, &udp_conf, &sock);
2713 return ERR_PTR(err);
2718 /* Create new listen socket if needed */
2719 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2720 __be16 port, u32 flags)
2722 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2723 struct vxlan_sock *vs;
2724 struct socket *sock;
2726 struct udp_tunnel_sock_cfg tunnel_cfg;
2728 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2730 return ERR_PTR(-ENOMEM);
2732 for (h = 0; h < VNI_HASH_SIZE; ++h)
2733 INIT_HLIST_HEAD(&vs->vni_list[h]);
2735 sock = vxlan_create_sock(net, ipv6, port, flags);
2737 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2740 return ERR_CAST(sock);
2744 atomic_set(&vs->refcnt, 1);
2745 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2747 spin_lock(&vn->sock_lock);
2748 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2749 vxlan_notify_add_rx_port(vs);
2750 spin_unlock(&vn->sock_lock);
2752 /* Mark socket as an encapsulation socket. */
2753 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2754 tunnel_cfg.sk_user_data = vs;
2755 tunnel_cfg.encap_type = 1;
2756 tunnel_cfg.encap_rcv = vxlan_rcv;
2757 tunnel_cfg.encap_destroy = NULL;
2758 tunnel_cfg.gro_receive = vxlan_gro_receive;
2759 tunnel_cfg.gro_complete = vxlan_gro_complete;
2761 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2766 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2768 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2769 struct vxlan_sock *vs = NULL;
2771 if (!vxlan->cfg.no_share) {
2772 spin_lock(&vn->sock_lock);
2773 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2774 vxlan->cfg.dst_port, vxlan->flags);
2775 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2776 spin_unlock(&vn->sock_lock);
2779 spin_unlock(&vn->sock_lock);
2782 vs = vxlan_socket_create(vxlan->net, ipv6,
2783 vxlan->cfg.dst_port, vxlan->flags);
2786 #if IS_ENABLED(CONFIG_IPV6)
2788 vxlan->vn6_sock = vs;
2791 vxlan->vn4_sock = vs;
2792 vxlan_vs_add_dev(vs, vxlan);
2796 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2798 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2799 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2802 vxlan->vn4_sock = NULL;
2803 #if IS_ENABLED(CONFIG_IPV6)
2804 vxlan->vn6_sock = NULL;
2805 if (ipv6 || metadata)
2806 ret = __vxlan_sock_add(vxlan, true);
2808 if (!ret && (!ipv6 || metadata))
2809 ret = __vxlan_sock_add(vxlan, false);
2811 vxlan_sock_release(vxlan);
2815 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2816 struct vxlan_config *conf)
2818 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2819 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2820 struct vxlan_rdst *dst = &vxlan->default_dst;
2821 unsigned short needed_headroom = ETH_HLEN;
2823 bool use_ipv6 = false;
2824 __be16 default_port = vxlan->cfg.dst_port;
2825 struct net_device *lowerdev = NULL;
2827 if (conf->flags & VXLAN_F_GPE) {
2828 if (conf->flags & ~VXLAN_F_ALLOWED_GPE)
2830 /* For now, allow GPE only together with COLLECT_METADATA.
2831 * This can be relaxed later; in such case, the other side
2832 * of the PtP link will have to be provided.
2834 if (!(conf->flags & VXLAN_F_COLLECT_METADATA))
2837 vxlan_raw_setup(dev);
2839 vxlan_ether_setup(dev);
2842 vxlan->net = src_net;
2844 dst->remote_vni = conf->vni;
2846 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2848 /* Unless IPv6 is explicitly requested, assume IPv4 */
2849 if (!dst->remote_ip.sa.sa_family)
2850 dst->remote_ip.sa.sa_family = AF_INET;
2852 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2853 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2854 if (!IS_ENABLED(CONFIG_IPV6))
2855 return -EPFNOSUPPORT;
2857 vxlan->flags |= VXLAN_F_IPV6;
2860 if (conf->label && !use_ipv6) {
2861 pr_info("label only supported in use with IPv6\n");
2865 if (conf->remote_ifindex) {
2866 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2867 dst->remote_ifindex = conf->remote_ifindex;
2870 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2874 #if IS_ENABLED(CONFIG_IPV6)
2876 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2877 if (idev && idev->cnf.disable_ipv6) {
2878 pr_info("IPv6 is disabled via sysctl\n");
2885 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2887 needed_headroom = lowerdev->hard_header_len;
2891 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2896 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2897 needed_headroom += VXLAN6_HEADROOM;
2899 needed_headroom += VXLAN_HEADROOM;
2900 dev->needed_headroom = needed_headroom;
2902 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2903 if (!vxlan->cfg.dst_port) {
2904 if (conf->flags & VXLAN_F_GPE)
2905 vxlan->cfg.dst_port = 4790; /* IANA assigned VXLAN-GPE port */
2907 vxlan->cfg.dst_port = default_port;
2909 vxlan->flags |= conf->flags;
2911 if (!vxlan->cfg.age_interval)
2912 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2914 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2915 if (tmp->cfg.vni == conf->vni &&
2916 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2917 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2918 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2919 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2920 (vxlan->flags & VXLAN_F_RCV_FLAGS))
2924 dev->ethtool_ops = &vxlan_ethtool_ops;
2926 /* create an fdb entry for a valid default destination */
2927 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2928 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2929 &vxlan->default_dst.remote_ip,
2930 NUD_REACHABLE|NUD_PERMANENT,
2931 NLM_F_EXCL|NLM_F_CREATE,
2932 vxlan->cfg.dst_port,
2933 vxlan->default_dst.remote_vni,
2934 vxlan->default_dst.remote_ifindex,
2940 err = register_netdevice(dev);
2942 vxlan_fdb_delete_default(vxlan);
2946 list_add(&vxlan->next, &vn->vxlan_list);
2951 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2952 u8 name_assign_type, struct vxlan_config *conf)
2954 struct nlattr *tb[IFLA_MAX+1];
2955 struct net_device *dev;
2958 memset(&tb, 0, sizeof(tb));
2960 dev = rtnl_create_link(net, name, name_assign_type,
2961 &vxlan_link_ops, tb);
2965 err = vxlan_dev_configure(net, dev, conf);
2968 return ERR_PTR(err);
2973 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2975 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2976 struct nlattr *tb[], struct nlattr *data[])
2978 struct vxlan_config conf;
2981 memset(&conf, 0, sizeof(conf));
2983 if (data[IFLA_VXLAN_ID])
2984 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2986 if (data[IFLA_VXLAN_GROUP]) {
2987 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2988 } else if (data[IFLA_VXLAN_GROUP6]) {
2989 if (!IS_ENABLED(CONFIG_IPV6))
2990 return -EPFNOSUPPORT;
2992 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2993 conf.remote_ip.sa.sa_family = AF_INET6;
2996 if (data[IFLA_VXLAN_LOCAL]) {
2997 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2998 conf.saddr.sa.sa_family = AF_INET;
2999 } else if (data[IFLA_VXLAN_LOCAL6]) {
3000 if (!IS_ENABLED(CONFIG_IPV6))
3001 return -EPFNOSUPPORT;
3003 /* TODO: respect scope id */
3004 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3005 conf.saddr.sa.sa_family = AF_INET6;
3008 if (data[IFLA_VXLAN_LINK])
3009 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3011 if (data[IFLA_VXLAN_TOS])
3012 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3014 if (data[IFLA_VXLAN_TTL])
3015 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3017 if (data[IFLA_VXLAN_LABEL])
3018 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3019 IPV6_FLOWLABEL_MASK;
3021 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3022 conf.flags |= VXLAN_F_LEARN;
3024 if (data[IFLA_VXLAN_AGEING])
3025 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3027 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
3028 conf.flags |= VXLAN_F_PROXY;
3030 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
3031 conf.flags |= VXLAN_F_RSC;
3033 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3034 conf.flags |= VXLAN_F_L2MISS;
3036 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3037 conf.flags |= VXLAN_F_L3MISS;
3039 if (data[IFLA_VXLAN_LIMIT])
3040 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3042 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
3043 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3044 conf.flags |= VXLAN_F_COLLECT_METADATA;
3046 if (data[IFLA_VXLAN_PORT_RANGE]) {
3047 const struct ifla_vxlan_port_range *p
3048 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3049 conf.port_min = ntohs(p->low);
3050 conf.port_max = ntohs(p->high);
3053 if (data[IFLA_VXLAN_PORT])
3054 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3056 if (data[IFLA_VXLAN_UDP_CSUM] &&
3057 !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3058 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3060 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
3061 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3062 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3064 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3065 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3066 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3068 if (data[IFLA_VXLAN_REMCSUM_TX] &&
3069 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3070 conf.flags |= VXLAN_F_REMCSUM_TX;
3072 if (data[IFLA_VXLAN_REMCSUM_RX] &&
3073 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3074 conf.flags |= VXLAN_F_REMCSUM_RX;
3076 if (data[IFLA_VXLAN_GBP])
3077 conf.flags |= VXLAN_F_GBP;
3079 if (data[IFLA_VXLAN_GPE])
3080 conf.flags |= VXLAN_F_GPE;
3082 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3083 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3085 err = vxlan_dev_configure(src_net, dev, &conf);
3088 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
3092 pr_info("IPv6 is disabled via sysctl\n");
3096 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
3100 pr_info("unsupported combination of extensions\n");
3107 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3109 struct vxlan_dev *vxlan = netdev_priv(dev);
3110 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3112 spin_lock(&vn->sock_lock);
3113 if (!hlist_unhashed(&vxlan->hlist))
3114 hlist_del_rcu(&vxlan->hlist);
3115 spin_unlock(&vn->sock_lock);
3117 gro_cells_destroy(&vxlan->gro_cells);
3118 list_del(&vxlan->next);
3119 unregister_netdevice_queue(dev, head);
3122 static size_t vxlan_get_size(const struct net_device *dev)
3125 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3126 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3127 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3128 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3129 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3130 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3131 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3132 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3133 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3134 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3135 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3136 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3137 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3138 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3139 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3140 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3141 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3142 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3143 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3144 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3145 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3146 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3150 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3152 const struct vxlan_dev *vxlan = netdev_priv(dev);
3153 const struct vxlan_rdst *dst = &vxlan->default_dst;
3154 struct ifla_vxlan_port_range ports = {
3155 .low = htons(vxlan->cfg.port_min),
3156 .high = htons(vxlan->cfg.port_max),
3159 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3160 goto nla_put_failure;
3162 if (!vxlan_addr_any(&dst->remote_ip)) {
3163 if (dst->remote_ip.sa.sa_family == AF_INET) {
3164 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3165 dst->remote_ip.sin.sin_addr.s_addr))
3166 goto nla_put_failure;
3167 #if IS_ENABLED(CONFIG_IPV6)
3169 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3170 &dst->remote_ip.sin6.sin6_addr))
3171 goto nla_put_failure;
3176 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3177 goto nla_put_failure;
3179 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3180 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3181 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3182 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3183 goto nla_put_failure;
3184 #if IS_ENABLED(CONFIG_IPV6)
3186 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3187 &vxlan->cfg.saddr.sin6.sin6_addr))
3188 goto nla_put_failure;
3193 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3194 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3195 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3196 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3197 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3198 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3199 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3200 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3201 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3202 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3203 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3204 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3205 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3206 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3207 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3208 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3209 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3210 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3211 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3212 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3213 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3214 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3215 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3216 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3217 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3218 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3219 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3220 goto nla_put_failure;
3222 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3223 goto nla_put_failure;
3225 if (vxlan->flags & VXLAN_F_GBP &&
3226 nla_put_flag(skb, IFLA_VXLAN_GBP))
3227 goto nla_put_failure;
3229 if (vxlan->flags & VXLAN_F_GPE &&
3230 nla_put_flag(skb, IFLA_VXLAN_GPE))
3231 goto nla_put_failure;
3233 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3234 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3235 goto nla_put_failure;
3243 static struct net *vxlan_get_link_net(const struct net_device *dev)
3245 struct vxlan_dev *vxlan = netdev_priv(dev);
3250 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3252 .maxtype = IFLA_VXLAN_MAX,
3253 .policy = vxlan_policy,
3254 .priv_size = sizeof(struct vxlan_dev),
3255 .setup = vxlan_setup,
3256 .validate = vxlan_validate,
3257 .newlink = vxlan_newlink,
3258 .dellink = vxlan_dellink,
3259 .get_size = vxlan_get_size,
3260 .fill_info = vxlan_fill_info,
3261 .get_link_net = vxlan_get_link_net,
3264 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3265 struct net_device *dev)
3267 struct vxlan_dev *vxlan, *next;
3268 LIST_HEAD(list_kill);
3270 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3271 struct vxlan_rdst *dst = &vxlan->default_dst;
3273 /* In case we created vxlan device with carrier
3274 * and we loose the carrier due to module unload
3275 * we also need to remove vxlan device. In other
3276 * cases, it's not necessary and remote_ifindex
3277 * is 0 here, so no matches.
3279 if (dst->remote_ifindex == dev->ifindex)
3280 vxlan_dellink(vxlan->dev, &list_kill);
3283 unregister_netdevice_many(&list_kill);
3286 static int vxlan_lowerdev_event(struct notifier_block *unused,
3287 unsigned long event, void *ptr)
3289 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3290 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3292 if (event == NETDEV_UNREGISTER)
3293 vxlan_handle_lowerdev_unregister(vn, dev);
3298 static struct notifier_block vxlan_notifier_block __read_mostly = {
3299 .notifier_call = vxlan_lowerdev_event,
3302 static __net_init int vxlan_init_net(struct net *net)
3304 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3307 INIT_LIST_HEAD(&vn->vxlan_list);
3308 spin_lock_init(&vn->sock_lock);
3310 for (h = 0; h < PORT_HASH_SIZE; ++h)
3311 INIT_HLIST_HEAD(&vn->sock_list[h]);
3316 static void __net_exit vxlan_exit_net(struct net *net)
3318 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3319 struct vxlan_dev *vxlan, *next;
3320 struct net_device *dev, *aux;
3324 for_each_netdev_safe(net, dev, aux)
3325 if (dev->rtnl_link_ops == &vxlan_link_ops)
3326 unregister_netdevice_queue(dev, &list);
3328 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3329 /* If vxlan->dev is in the same netns, it has already been added
3330 * to the list by the previous loop.
3332 if (!net_eq(dev_net(vxlan->dev), net)) {
3333 gro_cells_destroy(&vxlan->gro_cells);
3334 unregister_netdevice_queue(vxlan->dev, &list);
3338 unregister_netdevice_many(&list);
3342 static struct pernet_operations vxlan_net_ops = {
3343 .init = vxlan_init_net,
3344 .exit = vxlan_exit_net,
3345 .id = &vxlan_net_id,
3346 .size = sizeof(struct vxlan_net),
3349 static int __init vxlan_init_module(void)
3353 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3355 rc = register_pernet_subsys(&vxlan_net_ops);
3359 rc = register_netdevice_notifier(&vxlan_notifier_block);
3363 rc = rtnl_link_register(&vxlan_link_ops);
3369 unregister_netdevice_notifier(&vxlan_notifier_block);
3371 unregister_pernet_subsys(&vxlan_net_ops);
3375 late_initcall(vxlan_init_module);
3377 static void __exit vxlan_cleanup_module(void)
3379 rtnl_link_unregister(&vxlan_link_ops);
3380 unregister_netdevice_notifier(&vxlan_notifier_block);
3381 unregister_pernet_subsys(&vxlan_net_ops);
3382 /* rcu_barrier() is called by netns */
3384 module_exit(vxlan_cleanup_module);
3386 MODULE_LICENSE("GPL");
3387 MODULE_VERSION(VXLAN_VERSION);
3388 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3389 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3390 MODULE_ALIAS_RTNL_LINK("vxlan");