1 // SPDX-License-Identifier: GPL-2.0-only
3 * VXLAN: Virtual eXtensible Local Area Network
5 * Copyright (c) 2012-2013 Vyatta Inc.
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/errno.h>
13 #include <linux/slab.h>
14 #include <linux/udp.h>
15 #include <linux/igmp.h>
16 #include <linux/if_ether.h>
17 #include <linux/ethtool.h>
19 #include <net/ndisc.h>
20 #include <net/ipv6_stubs.h>
23 #include <net/rtnetlink.h>
24 #include <net/inet_ecn.h>
25 #include <net/net_namespace.h>
26 #include <net/netns/generic.h>
27 #include <net/tun_proto.h>
28 #include <net/vxlan.h>
29 #include <net/nexthop.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <net/ip6_tunnel.h>
33 #include <net/ip6_checksum.h>
36 #define VXLAN_VERSION "0.1"
38 #define PORT_HASH_BITS 8
39 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
40 #define FDB_AGE_DEFAULT 300 /* 5 min */
41 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
43 /* UDP port for VXLAN traffic.
44 * The IANA assigned port is 4789, but the Linux default is 8472
45 * for compatibility with early adopters.
47 static unsigned short vxlan_port __read_mostly = 8472;
48 module_param_named(udp_port, vxlan_port, ushort, 0444);
49 MODULE_PARM_DESC(udp_port, "Destination UDP port");
51 static bool log_ecn_error = true;
52 module_param(log_ecn_error, bool, 0644);
53 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
55 static unsigned int vxlan_net_id;
56 static struct rtnl_link_ops vxlan_link_ops;
58 static const u8 all_zeros_mac[ETH_ALEN + 2];
60 static int vxlan_sock_add(struct vxlan_dev *vxlan);
62 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
64 /* per-network namespace private data for this module */
66 struct list_head vxlan_list;
67 struct hlist_head sock_list[PORT_HASH_SIZE];
71 /* Forwarding table entry */
73 struct hlist_node hlist; /* linked list of entries */
75 unsigned long updated; /* jiffies */
77 struct list_head remotes;
78 u8 eth_addr[ETH_ALEN];
79 u16 state; /* see ndm_state */
81 u16 flags; /* see ndm_flags and below */
82 struct list_head nh_list;
83 struct nexthop __rcu *nh;
84 struct vxlan_dev __rcu *vdev;
87 #define NTF_VXLAN_ADDED_BY_USER 0x100
89 /* salt for hash table */
90 static u32 vxlan_salt __read_mostly;
92 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
94 return vs->flags & VXLAN_F_COLLECT_METADATA ||
95 ip_tunnel_collect_metadata();
98 #if IS_ENABLED(CONFIG_IPV6)
100 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
102 if (a->sa.sa_family != b->sa.sa_family)
104 if (a->sa.sa_family == AF_INET6)
105 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
107 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
110 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
112 if (nla_len(nla) >= sizeof(struct in6_addr)) {
113 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
114 ip->sa.sa_family = AF_INET6;
116 } else if (nla_len(nla) >= sizeof(__be32)) {
117 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
118 ip->sa.sa_family = AF_INET;
121 return -EAFNOSUPPORT;
125 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
126 const union vxlan_addr *ip)
128 if (ip->sa.sa_family == AF_INET6)
129 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
131 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
134 #else /* !CONFIG_IPV6 */
137 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
139 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
142 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
144 if (nla_len(nla) >= sizeof(struct in6_addr)) {
145 return -EAFNOSUPPORT;
146 } else if (nla_len(nla) >= sizeof(__be32)) {
147 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
148 ip->sa.sa_family = AF_INET;
151 return -EAFNOSUPPORT;
155 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
156 const union vxlan_addr *ip)
158 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
162 /* Virtual Network hash table head */
163 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
165 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
168 /* Socket hash table head */
169 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
171 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
173 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
176 /* First remote destination for a forwarding entry.
177 * Guaranteed to be non-NULL because remotes are never deleted.
179 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
181 if (rcu_access_pointer(fdb->nh))
183 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
186 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
188 if (rcu_access_pointer(fdb->nh))
190 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
193 /* Find VXLAN socket based on network namespace, address family and UDP port
194 * and enabled unshareable flags.
196 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
197 __be16 port, u32 flags, int ifindex)
199 struct vxlan_sock *vs;
201 flags &= VXLAN_F_RCV_FLAGS;
203 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
204 if (inet_sk(vs->sock->sk)->inet_sport == port &&
205 vxlan_get_sk_family(vs) == family &&
206 vs->flags == flags &&
207 vs->sock->sk->sk_bound_dev_if == ifindex)
213 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
216 struct vxlan_dev_node *node;
218 /* For flow based devices, map all packets to VNI 0 */
219 if (vs->flags & VXLAN_F_COLLECT_METADATA)
222 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
223 if (node->vxlan->default_dst.remote_vni != vni)
226 if (IS_ENABLED(CONFIG_IPV6)) {
227 const struct vxlan_config *cfg = &node->vxlan->cfg;
229 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
230 cfg->remote_ifindex != ifindex)
240 /* Look up VNI in a per net namespace table */
241 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
242 __be32 vni, sa_family_t family,
243 __be16 port, u32 flags)
245 struct vxlan_sock *vs;
247 vs = vxlan_find_sock(net, family, port, flags, ifindex);
251 return vxlan_vs_find_vni(vs, ifindex, vni);
254 /* Fill in neighbour message in skbuff. */
255 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
256 const struct vxlan_fdb *fdb,
257 u32 portid, u32 seq, int type, unsigned int flags,
258 const struct vxlan_rdst *rdst)
260 unsigned long now = jiffies;
261 struct nda_cacheinfo ci;
262 bool send_ip, send_eth;
263 struct nlmsghdr *nlh;
269 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
273 ndm = nlmsg_data(nlh);
274 memset(ndm, 0, sizeof(*ndm));
276 send_eth = send_ip = true;
279 nh = rcu_dereference(fdb->nh);
281 nh_family = nexthop_get_family(nh);
286 if (type == RTM_GETNEIGH) {
288 send_ip = !vxlan_addr_any(&rdst->remote_ip);
289 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
291 ndm->ndm_family = nh_family;
293 send_eth = !is_zero_ether_addr(fdb->eth_addr);
295 ndm->ndm_family = AF_BRIDGE;
296 ndm->ndm_state = fdb->state;
297 ndm->ndm_ifindex = vxlan->dev->ifindex;
298 ndm->ndm_flags = fdb->flags;
299 if (rdst && rdst->offloaded)
300 ndm->ndm_flags |= NTF_OFFLOADED;
301 ndm->ndm_type = RTN_UNICAST;
303 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
304 nla_put_s32(skb, NDA_LINK_NETNSID,
305 peernet2id(dev_net(vxlan->dev), vxlan->net)))
306 goto nla_put_failure;
308 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
309 goto nla_put_failure;
311 if (nla_put_u32(skb, NDA_NH_ID, nh_id))
312 goto nla_put_failure;
314 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
316 goto nla_put_failure;
318 if (rdst->remote_port &&
319 rdst->remote_port != vxlan->cfg.dst_port &&
320 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
321 goto nla_put_failure;
322 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
323 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
324 goto nla_put_failure;
325 if (rdst->remote_ifindex &&
326 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
327 goto nla_put_failure;
330 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
331 nla_put_u32(skb, NDA_SRC_VNI,
332 be32_to_cpu(fdb->vni)))
333 goto nla_put_failure;
335 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
336 ci.ndm_confirmed = 0;
337 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
340 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
341 goto nla_put_failure;
347 nlmsg_cancel(skb, nlh);
351 static inline size_t vxlan_nlmsg_size(void)
353 return NLMSG_ALIGN(sizeof(struct ndmsg))
354 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
355 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
356 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
357 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
358 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
359 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
360 + nla_total_size(sizeof(struct nda_cacheinfo));
363 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
364 struct vxlan_rdst *rd, int type)
366 struct net *net = dev_net(vxlan->dev);
370 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
374 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
376 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
377 WARN_ON(err == -EMSGSIZE);
382 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
386 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
389 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
390 const struct vxlan_fdb *fdb,
391 const struct vxlan_rdst *rd,
392 struct netlink_ext_ack *extack,
393 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
395 fdb_info->info.dev = vxlan->dev;
396 fdb_info->info.extack = extack;
397 fdb_info->remote_ip = rd->remote_ip;
398 fdb_info->remote_port = rd->remote_port;
399 fdb_info->remote_vni = rd->remote_vni;
400 fdb_info->remote_ifindex = rd->remote_ifindex;
401 memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
402 fdb_info->vni = fdb->vni;
403 fdb_info->offloaded = rd->offloaded;
404 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
407 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
408 struct vxlan_fdb *fdb,
409 struct vxlan_rdst *rd,
411 struct netlink_ext_ack *extack)
413 struct switchdev_notifier_vxlan_fdb_info info;
414 enum switchdev_notifier_type notifier_type;
420 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
421 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
422 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
423 ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
425 return notifier_to_errno(ret);
428 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
429 struct vxlan_rdst *rd, int type, bool swdev_notify,
430 struct netlink_ext_ack *extack)
434 if (swdev_notify && rd) {
437 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
443 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
449 __vxlan_fdb_notify(vxlan, fdb, rd, type);
453 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
455 struct vxlan_dev *vxlan = netdev_priv(dev);
456 struct vxlan_fdb f = {
459 struct vxlan_rdst remote = {
460 .remote_ip = *ipa, /* goes to NDA_DST */
461 .remote_vni = cpu_to_be32(VXLAN_N_VID),
464 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
467 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
469 struct vxlan_fdb f = {
472 struct vxlan_rdst remote = { };
474 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
476 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
479 /* Hash Ethernet address */
480 static u32 eth_hash(const unsigned char *addr)
482 u64 value = get_unaligned((u64 *)addr);
484 /* only want 6 bytes */
490 return hash_64(value, FDB_HASH_BITS);
493 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
495 /* use 1 byte of OUI and 3 bytes of NIC */
496 u32 key = get_unaligned((u32 *)(addr + 2));
498 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
501 static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
503 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
504 return eth_vni_hash(mac, vni);
506 return eth_hash(mac);
509 /* Hash chain to use given mac address */
510 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
511 const u8 *mac, __be32 vni)
513 return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
516 /* Look up Ethernet address in forwarding table */
517 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
518 const u8 *mac, __be32 vni)
520 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
523 hlist_for_each_entry_rcu(f, head, hlist) {
524 if (ether_addr_equal(mac, f->eth_addr)) {
525 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
537 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
538 const u8 *mac, __be32 vni)
542 f = __vxlan_find_mac(vxlan, mac, vni);
543 if (f && f->used != jiffies)
549 /* caller should hold vxlan->hash_lock */
550 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
551 union vxlan_addr *ip, __be16 port,
552 __be32 vni, __u32 ifindex)
554 struct vxlan_rdst *rd;
556 list_for_each_entry(rd, &f->remotes, list) {
557 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
558 rd->remote_port == port &&
559 rd->remote_vni == vni &&
560 rd->remote_ifindex == ifindex)
567 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
568 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
570 struct vxlan_dev *vxlan = netdev_priv(dev);
571 u8 eth_addr[ETH_ALEN + 2] = { 0 };
572 struct vxlan_rdst *rdst;
576 if (is_multicast_ether_addr(mac) ||
577 is_zero_ether_addr(mac))
580 ether_addr_copy(eth_addr, mac);
584 f = __vxlan_find_mac(vxlan, eth_addr, vni);
590 rdst = first_remote_rcu(f);
591 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
597 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
599 static int vxlan_fdb_notify_one(struct notifier_block *nb,
600 const struct vxlan_dev *vxlan,
601 const struct vxlan_fdb *f,
602 const struct vxlan_rdst *rdst,
603 struct netlink_ext_ack *extack)
605 struct switchdev_notifier_vxlan_fdb_info fdb_info;
608 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
609 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
611 return notifier_to_errno(rc);
614 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
615 struct notifier_block *nb,
616 struct netlink_ext_ack *extack)
618 struct vxlan_dev *vxlan;
619 struct vxlan_rdst *rdst;
624 if (!netif_is_vxlan(dev))
626 vxlan = netdev_priv(dev);
628 for (h = 0; h < FDB_HASH_SIZE; ++h) {
629 spin_lock_bh(&vxlan->hash_lock[h]);
630 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
632 list_for_each_entry(rdst, &f->remotes, list) {
633 rc = vxlan_fdb_notify_one(nb, vxlan,
641 spin_unlock_bh(&vxlan->hash_lock[h]);
646 spin_unlock_bh(&vxlan->hash_lock[h]);
649 EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
651 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
653 struct vxlan_dev *vxlan;
654 struct vxlan_rdst *rdst;
658 if (!netif_is_vxlan(dev))
660 vxlan = netdev_priv(dev);
662 for (h = 0; h < FDB_HASH_SIZE; ++h) {
663 spin_lock_bh(&vxlan->hash_lock[h]);
664 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
666 list_for_each_entry(rdst, &f->remotes, list)
667 rdst->offloaded = false;
668 spin_unlock_bh(&vxlan->hash_lock[h]);
672 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
674 /* Replace destination of unicast mac */
675 static int vxlan_fdb_replace(struct vxlan_fdb *f,
676 union vxlan_addr *ip, __be16 port, __be32 vni,
677 __u32 ifindex, struct vxlan_rdst *oldrd)
679 struct vxlan_rdst *rd;
681 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
685 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
690 dst_cache_reset(&rd->dst_cache);
692 rd->remote_port = port;
693 rd->remote_vni = vni;
694 rd->remote_ifindex = ifindex;
695 rd->offloaded = false;
699 /* Add/update destinations for multicast */
700 static int vxlan_fdb_append(struct vxlan_fdb *f,
701 union vxlan_addr *ip, __be16 port, __be32 vni,
702 __u32 ifindex, struct vxlan_rdst **rdp)
704 struct vxlan_rdst *rd;
706 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
710 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
714 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
720 rd->remote_port = port;
721 rd->offloaded = false;
722 rd->remote_vni = vni;
723 rd->remote_ifindex = ifindex;
725 list_add_tail_rcu(&rd->list, &f->remotes);
731 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
733 struct vxlanhdr *vh, size_t hdrlen,
735 struct gro_remcsum *grc,
738 size_t start, offset;
740 if (skb->remcsum_offload)
743 if (!NAPI_GRO_CB(skb)->csum_valid)
746 start = vxlan_rco_start(vni_field);
747 offset = start + vxlan_rco_offset(vni_field);
749 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
750 start, offset, grc, nopartial);
752 skb->remcsum_offload = 1;
757 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
758 struct list_head *head,
761 struct sk_buff *pp = NULL;
763 struct vxlanhdr *vh, *vh2;
764 unsigned int hlen, off_vx;
766 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
768 struct gro_remcsum grc;
770 skb_gro_remcsum_init(&grc);
772 off_vx = skb_gro_offset(skb);
773 hlen = off_vx + sizeof(*vh);
774 vh = skb_gro_header_fast(skb, off_vx);
775 if (skb_gro_header_hard(skb, hlen)) {
776 vh = skb_gro_header_slow(skb, hlen, off_vx);
781 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
783 flags = vh->vx_flags;
785 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
786 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
789 VXLAN_F_REMCSUM_NOPARTIAL));
795 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
797 list_for_each_entry(p, head, list) {
798 if (!NAPI_GRO_CB(p)->same_flow)
801 vh2 = (struct vxlanhdr *)(p->data + off_vx);
802 if (vh->vx_flags != vh2->vx_flags ||
803 vh->vx_vni != vh2->vx_vni) {
804 NAPI_GRO_CB(p)->same_flow = 0;
809 pp = call_gro_receive(eth_gro_receive, head, skb);
813 skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
818 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
820 /* Sets 'skb->inner_mac_header' since we are always called with
821 * 'skb->encapsulation' set.
823 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
826 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
827 __u16 state, __be32 src_vni,
832 f = kmalloc(sizeof(*f), GFP_ATOMIC);
836 f->flags = ndm_flags;
837 f->updated = f->used = jiffies;
840 RCU_INIT_POINTER(f->vdev, vxlan);
841 INIT_LIST_HEAD(&f->nh_list);
842 INIT_LIST_HEAD(&f->remotes);
843 memcpy(f->eth_addr, mac, ETH_ALEN);
848 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
849 __be32 src_vni, struct vxlan_fdb *f)
852 hlist_add_head_rcu(&f->hlist,
853 vxlan_fdb_head(vxlan, mac, src_vni));
856 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
857 u32 nhid, struct netlink_ext_ack *extack)
859 struct nexthop *old_nh = rtnl_dereference(fdb->nh);
863 if (old_nh && old_nh->id == nhid)
866 nh = nexthop_find_by_id(vxlan->net, nhid);
868 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
873 if (!nexthop_get(nh)) {
874 NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
878 if (!nexthop_is_fdb(nh)) {
879 NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
883 if (!nexthop_is_multipath(nh)) {
884 NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
888 /* check nexthop group family */
889 switch (vxlan->default_dst.remote_ip.sa.sa_family) {
891 if (!nexthop_has_v4(nh)) {
893 NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
898 if (nexthop_has_v4(nh)) {
900 NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
907 list_del_rcu(&fdb->nh_list);
910 rcu_assign_pointer(fdb->nh, nh);
911 list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
920 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
921 const u8 *mac, union vxlan_addr *ip,
922 __u16 state, __be16 port, __be32 src_vni,
923 __be32 vni, __u32 ifindex, __u16 ndm_flags,
924 u32 nhid, struct vxlan_fdb **fdb,
925 struct netlink_ext_ack *extack)
927 struct vxlan_rdst *rd = NULL;
931 if (vxlan->cfg.addrmax &&
932 vxlan->addrcnt >= vxlan->cfg.addrmax)
935 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
936 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
941 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
943 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
956 static void __vxlan_fdb_free(struct vxlan_fdb *f)
958 struct vxlan_rdst *rd, *nd;
961 nh = rcu_dereference_raw(f->nh);
963 rcu_assign_pointer(f->nh, NULL);
964 rcu_assign_pointer(f->vdev, NULL);
968 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
969 dst_cache_destroy(&rd->dst_cache);
975 static void vxlan_fdb_free(struct rcu_head *head)
977 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
982 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
983 bool do_notify, bool swdev_notify)
985 struct vxlan_rdst *rd;
987 netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
991 if (rcu_access_pointer(f->nh))
992 vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
995 list_for_each_entry(rd, &f->remotes, list)
996 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
1000 hlist_del_rcu(&f->hlist);
1001 list_del_rcu(&f->nh_list);
1002 call_rcu(&f->rcu, vxlan_fdb_free);
1005 static void vxlan_dst_free(struct rcu_head *head)
1007 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
1009 dst_cache_destroy(&rd->dst_cache);
1013 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
1014 union vxlan_addr *ip,
1015 __u16 state, __u16 flags,
1016 __be16 port, __be32 vni,
1017 __u32 ifindex, __u16 ndm_flags,
1018 struct vxlan_fdb *f, u32 nhid,
1020 struct netlink_ext_ack *extack)
1022 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
1023 struct vxlan_rdst *rd = NULL;
1024 struct vxlan_rdst oldrd;
1029 if (nhid && !rcu_access_pointer(f->nh)) {
1030 NL_SET_ERR_MSG(extack,
1031 "Cannot replace an existing non nexthop fdb with a nexthop");
1035 if (nhid && (flags & NLM_F_APPEND)) {
1036 NL_SET_ERR_MSG(extack,
1037 "Cannot append to a nexthop fdb");
1041 /* Do not allow an externally learned entry to take over an entry added
1044 if (!(fdb_flags & NTF_EXT_LEARNED) ||
1045 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
1046 if (f->state != state) {
1048 f->updated = jiffies;
1051 if (f->flags != fdb_flags) {
1052 f->flags = fdb_flags;
1053 f->updated = jiffies;
1058 if ((flags & NLM_F_REPLACE)) {
1059 /* Only change unicasts */
1060 if (!(is_multicast_ether_addr(f->eth_addr) ||
1061 is_zero_ether_addr(f->eth_addr))) {
1063 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
1067 rc = vxlan_fdb_replace(f, ip, port, vni,
1072 NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
1076 if ((flags & NLM_F_APPEND) &&
1077 (is_multicast_ether_addr(f->eth_addr) ||
1078 is_zero_ether_addr(f->eth_addr))) {
1079 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
1086 if (ndm_flags & NTF_USE)
1091 rd = first_remote_rtnl(f);
1093 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
1094 swdev_notify, extack);
1104 if ((flags & NLM_F_REPLACE) && rc)
1106 else if ((flags & NLM_F_APPEND) && rc) {
1107 list_del_rcu(&rd->list);
1108 call_rcu(&rd->rcu, vxlan_dst_free);
1113 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
1114 const u8 *mac, union vxlan_addr *ip,
1115 __u16 state, __u16 flags,
1116 __be16 port, __be32 src_vni, __be32 vni,
1117 __u32 ifindex, __u16 ndm_flags, u32 nhid,
1119 struct netlink_ext_ack *extack)
1121 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
1122 struct vxlan_fdb *f;
1125 /* Disallow replace to add a multicast entry */
1126 if ((flags & NLM_F_REPLACE) &&
1127 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
1130 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
1131 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
1132 vni, ifindex, fdb_flags, nhid, &f, extack);
1136 vxlan_fdb_insert(vxlan, mac, src_vni, f);
1137 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
1138 swdev_notify, extack);
1145 vxlan_fdb_destroy(vxlan, f, false, false);
1149 /* Add new entry to forwarding table -- assumes lock held */
1150 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
1151 const u8 *mac, union vxlan_addr *ip,
1152 __u16 state, __u16 flags,
1153 __be16 port, __be32 src_vni, __be32 vni,
1154 __u32 ifindex, __u16 ndm_flags, u32 nhid,
1156 struct netlink_ext_ack *extack)
1158 struct vxlan_fdb *f;
1160 f = __vxlan_find_mac(vxlan, mac, src_vni);
1162 if (flags & NLM_F_EXCL) {
1163 netdev_dbg(vxlan->dev,
1164 "lost race to create %pM\n", mac);
1168 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1169 vni, ifindex, ndm_flags, f,
1170 nhid, swdev_notify, extack);
1172 if (!(flags & NLM_F_CREATE))
1175 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1176 port, src_vni, vni, ifindex,
1177 ndm_flags, nhid, swdev_notify,
1182 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1183 struct vxlan_rdst *rd, bool swdev_notify)
1185 list_del_rcu(&rd->list);
1186 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1187 call_rcu(&rd->rcu, vxlan_dst_free);
1190 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1191 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1192 __be32 *vni, u32 *ifindex, u32 *nhid)
1194 struct net *net = dev_net(vxlan->dev);
1197 if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] ||
1202 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1206 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1208 if (remote->sa.sa_family == AF_INET) {
1209 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1210 ip->sa.sa_family = AF_INET;
1211 #if IS_ENABLED(CONFIG_IPV6)
1213 ip->sin6.sin6_addr = in6addr_any;
1214 ip->sa.sa_family = AF_INET6;
1220 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
1222 *port = nla_get_be16(tb[NDA_PORT]);
1224 *port = vxlan->cfg.dst_port;
1228 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
1230 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1232 *vni = vxlan->default_dst.remote_vni;
1235 if (tb[NDA_SRC_VNI]) {
1236 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
1238 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1240 *src_vni = vxlan->default_dst.remote_vni;
1243 if (tb[NDA_IFINDEX]) {
1244 struct net_device *tdev;
1246 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
1248 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1249 tdev = __dev_get_by_index(net, *ifindex);
1251 return -EADDRNOTAVAIL;
1257 *nhid = nla_get_u32(tb[NDA_NH_ID]);
1264 /* Add static entry (via netlink) */
1265 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1266 struct net_device *dev,
1267 const unsigned char *addr, u16 vid, u16 flags,
1268 struct netlink_ext_ack *extack)
1270 struct vxlan_dev *vxlan = netdev_priv(dev);
1271 /* struct net *net = dev_net(vxlan->dev); */
1272 union vxlan_addr ip;
1274 __be32 src_vni, vni;
1279 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1280 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1285 if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
1288 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1293 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1294 return -EAFNOSUPPORT;
1296 hash_index = fdb_head_index(vxlan, addr, src_vni);
1297 spin_lock_bh(&vxlan->hash_lock[hash_index]);
1298 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1299 port, src_vni, vni, ifindex,
1300 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1301 nhid, true, extack);
1302 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1307 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1308 const unsigned char *addr, union vxlan_addr ip,
1309 __be16 port, __be32 src_vni, __be32 vni,
1310 u32 ifindex, bool swdev_notify)
1312 struct vxlan_rdst *rd = NULL;
1313 struct vxlan_fdb *f;
1316 f = vxlan_find_mac(vxlan, addr, src_vni);
1320 if (!vxlan_addr_any(&ip)) {
1321 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1326 /* remove a destination if it's not the only one on the list,
1327 * otherwise destroy the fdb entry
1329 if (rd && !list_is_singular(&f->remotes)) {
1330 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1334 vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1340 /* Delete entry (via netlink) */
1341 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1342 struct net_device *dev,
1343 const unsigned char *addr, u16 vid)
1345 struct vxlan_dev *vxlan = netdev_priv(dev);
1346 union vxlan_addr ip;
1347 __be32 src_vni, vni;
1353 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1358 hash_index = fdb_head_index(vxlan, addr, src_vni);
1359 spin_lock_bh(&vxlan->hash_lock[hash_index]);
1360 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1362 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1367 /* Dump forwarding table */
1368 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1369 struct net_device *dev,
1370 struct net_device *filter_dev, int *idx)
1372 struct vxlan_dev *vxlan = netdev_priv(dev);
1376 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1377 struct vxlan_fdb *f;
1380 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1381 struct vxlan_rdst *rd;
1383 if (rcu_access_pointer(f->nh)) {
1384 if (*idx < cb->args[2])
1386 err = vxlan_fdb_info(skb, vxlan, f,
1387 NETLINK_CB(cb->skb).portid,
1400 list_for_each_entry_rcu(rd, &f->remotes, list) {
1401 if (*idx < cb->args[2])
1404 err = vxlan_fdb_info(skb, vxlan, f,
1405 NETLINK_CB(cb->skb).portid,
1423 static int vxlan_fdb_get(struct sk_buff *skb,
1424 struct nlattr *tb[],
1425 struct net_device *dev,
1426 const unsigned char *addr,
1427 u16 vid, u32 portid, u32 seq,
1428 struct netlink_ext_ack *extack)
1430 struct vxlan_dev *vxlan = netdev_priv(dev);
1431 struct vxlan_fdb *f;
1436 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1438 vni = vxlan->default_dst.remote_vni;
1442 f = __vxlan_find_mac(vxlan, addr, vni);
1444 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1449 err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1450 RTM_NEWNEIGH, 0, first_remote_rcu(f));
1456 /* Watch incoming packets to learn mapping between Ethernet address
1457 * and Tunnel endpoint.
1458 * Return true if packet is bogus and should be dropped.
1460 static bool vxlan_snoop(struct net_device *dev,
1461 union vxlan_addr *src_ip, const u8 *src_mac,
1462 u32 src_ifindex, __be32 vni)
1464 struct vxlan_dev *vxlan = netdev_priv(dev);
1465 struct vxlan_fdb *f;
1468 #if IS_ENABLED(CONFIG_IPV6)
1469 if (src_ip->sa.sa_family == AF_INET6 &&
1470 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1471 ifindex = src_ifindex;
1474 f = vxlan_find_mac(vxlan, src_mac, vni);
1476 struct vxlan_rdst *rdst = first_remote_rcu(f);
1478 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1479 rdst->remote_ifindex == ifindex))
1482 /* Don't migrate static entries, drop packets */
1483 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1486 /* Don't override an fdb with nexthop with a learnt entry */
1487 if (rcu_access_pointer(f->nh))
1490 if (net_ratelimit())
1492 "%pM migrated from %pIS to %pIS\n",
1493 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1495 rdst->remote_ip = *src_ip;
1496 f->updated = jiffies;
1497 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1499 u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
1501 /* learned new entry */
1502 spin_lock(&vxlan->hash_lock[hash_index]);
1504 /* close off race between vxlan_flush and incoming packets */
1505 if (netif_running(dev))
1506 vxlan_fdb_update(vxlan, src_mac, src_ip,
1508 NLM_F_EXCL|NLM_F_CREATE,
1509 vxlan->cfg.dst_port,
1511 vxlan->default_dst.remote_vni,
1512 ifindex, NTF_SELF, 0, true, NULL);
1513 spin_unlock(&vxlan->hash_lock[hash_index]);
1519 /* See if multicast group is already in use by other ID */
1520 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1522 struct vxlan_dev *vxlan;
1523 struct vxlan_sock *sock4;
1524 #if IS_ENABLED(CONFIG_IPV6)
1525 struct vxlan_sock *sock6;
1527 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1529 sock4 = rtnl_dereference(dev->vn4_sock);
1531 /* The vxlan_sock is only used by dev, leaving group has
1532 * no effect on other vxlan devices.
1534 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1536 #if IS_ENABLED(CONFIG_IPV6)
1537 sock6 = rtnl_dereference(dev->vn6_sock);
1538 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1542 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1543 if (!netif_running(vxlan->dev) || vxlan == dev)
1546 if (family == AF_INET &&
1547 rtnl_dereference(vxlan->vn4_sock) != sock4)
1549 #if IS_ENABLED(CONFIG_IPV6)
1550 if (family == AF_INET6 &&
1551 rtnl_dereference(vxlan->vn6_sock) != sock6)
1555 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1556 &dev->default_dst.remote_ip))
1559 if (vxlan->default_dst.remote_ifindex !=
1560 dev->default_dst.remote_ifindex)
1569 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1571 struct vxlan_net *vn;
1575 if (!refcount_dec_and_test(&vs->refcnt))
1578 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1579 spin_lock(&vn->sock_lock);
1580 hlist_del_rcu(&vs->hlist);
1581 udp_tunnel_notify_del_rx_port(vs->sock,
1582 (vs->flags & VXLAN_F_GPE) ?
1583 UDP_TUNNEL_TYPE_VXLAN_GPE :
1584 UDP_TUNNEL_TYPE_VXLAN);
1585 spin_unlock(&vn->sock_lock);
1590 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1592 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1593 #if IS_ENABLED(CONFIG_IPV6)
1594 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1596 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1599 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1602 vxlan_vs_del_dev(vxlan);
1604 if (__vxlan_sock_release_prep(sock4)) {
1605 udp_tunnel_sock_release(sock4->sock);
1609 #if IS_ENABLED(CONFIG_IPV6)
1610 if (__vxlan_sock_release_prep(sock6)) {
1611 udp_tunnel_sock_release(sock6->sock);
1617 /* Update multicast group membership when first VNI on
1618 * multicast address is brought up
1620 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1623 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1624 int ifindex = vxlan->default_dst.remote_ifindex;
1627 if (ip->sa.sa_family == AF_INET) {
1628 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1629 struct ip_mreqn mreq = {
1630 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1631 .imr_ifindex = ifindex,
1634 sk = sock4->sock->sk;
1636 ret = ip_mc_join_group(sk, &mreq);
1638 #if IS_ENABLED(CONFIG_IPV6)
1640 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1642 sk = sock6->sock->sk;
1644 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1645 &ip->sin6.sin6_addr);
1653 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1654 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1657 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1658 int ifindex = vxlan->default_dst.remote_ifindex;
1661 if (ip->sa.sa_family == AF_INET) {
1662 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1663 struct ip_mreqn mreq = {
1664 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1665 .imr_ifindex = ifindex,
1668 sk = sock4->sock->sk;
1670 ret = ip_mc_leave_group(sk, &mreq);
1672 #if IS_ENABLED(CONFIG_IPV6)
1674 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1676 sk = sock6->sock->sk;
1678 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1679 &ip->sin6.sin6_addr);
1687 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1688 struct sk_buff *skb, u32 vxflags)
1690 size_t start, offset;
1692 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1695 start = vxlan_rco_start(unparsed->vx_vni);
1696 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1698 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1701 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1702 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1704 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1705 unparsed->vx_vni &= VXLAN_VNI_MASK;
1709 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1710 struct sk_buff *skb, u32 vxflags,
1711 struct vxlan_metadata *md)
1713 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1714 struct metadata_dst *tun_dst;
1716 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1719 md->gbp = ntohs(gbp->policy_id);
1721 tun_dst = (struct metadata_dst *)skb_dst(skb);
1723 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1724 tun_dst->u.tun_info.options_len = sizeof(*md);
1726 if (gbp->dont_learn)
1727 md->gbp |= VXLAN_GBP_DONT_LEARN;
1729 if (gbp->policy_applied)
1730 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1732 /* In flow-based mode, GBP is carried in dst_metadata */
1733 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1734 skb->mark = md->gbp;
1736 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1739 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1741 struct sk_buff *skb, u32 vxflags)
1743 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1745 /* Need to have Next Protocol set for interfaces in GPE mode. */
1746 if (!gpe->np_applied)
1748 /* "The initial version is 0. If a receiver does not support the
1749 * version indicated it MUST drop the packet.
1751 if (gpe->version != 0)
1753 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1754 * processing MUST occur." However, we don't implement OAM
1755 * processing, thus drop the packet.
1760 *protocol = tun_p_to_eth_p(gpe->next_protocol);
1764 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1768 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1769 struct vxlan_sock *vs,
1770 struct sk_buff *skb, __be32 vni)
1772 union vxlan_addr saddr;
1773 u32 ifindex = skb->dev->ifindex;
1775 skb_reset_mac_header(skb);
1776 skb->protocol = eth_type_trans(skb, vxlan->dev);
1777 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1779 /* Ignore packet loops (and multicast echo) */
1780 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1783 /* Get address from the outer IP header */
1784 if (vxlan_get_sk_family(vs) == AF_INET) {
1785 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1786 saddr.sa.sa_family = AF_INET;
1787 #if IS_ENABLED(CONFIG_IPV6)
1789 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1790 saddr.sa.sa_family = AF_INET6;
1794 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1795 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1801 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1802 struct sk_buff *skb)
1806 if (vxlan_get_sk_family(vs) == AF_INET)
1807 err = IP_ECN_decapsulate(oiph, skb);
1808 #if IS_ENABLED(CONFIG_IPV6)
1810 err = IP6_ECN_decapsulate(oiph, skb);
1813 if (unlikely(err) && log_ecn_error) {
1814 if (vxlan_get_sk_family(vs) == AF_INET)
1815 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1816 &((struct iphdr *)oiph)->saddr,
1817 ((struct iphdr *)oiph)->tos);
1819 net_info_ratelimited("non-ECT from %pI6\n",
1820 &((struct ipv6hdr *)oiph)->saddr);
1825 /* Callback from net/ipv4/udp.c to receive packets */
1826 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1828 struct pcpu_sw_netstats *stats;
1829 struct vxlan_dev *vxlan;
1830 struct vxlan_sock *vs;
1831 struct vxlanhdr unparsed;
1832 struct vxlan_metadata _md;
1833 struct vxlan_metadata *md = &_md;
1834 __be16 protocol = htons(ETH_P_TEB);
1835 bool raw_proto = false;
1839 /* Need UDP and VXLAN header to be present */
1840 if (!pskb_may_pull(skb, VXLAN_HLEN))
1843 unparsed = *vxlan_hdr(skb);
1844 /* VNI flag always required to be set */
1845 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1846 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1847 ntohl(vxlan_hdr(skb)->vx_flags),
1848 ntohl(vxlan_hdr(skb)->vx_vni));
1849 /* Return non vxlan pkt */
1852 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1853 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1855 vs = rcu_dereference_sk_user_data(sk);
1859 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1861 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1865 /* For backwards compatibility, only allow reserved fields to be
1866 * used by VXLAN extensions if explicitly requested.
1868 if (vs->flags & VXLAN_F_GPE) {
1869 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1874 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1875 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1878 if (vxlan_collect_metadata(vs)) {
1879 struct metadata_dst *tun_dst;
1881 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1882 key32_to_tunnel_id(vni), sizeof(*md));
1887 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1889 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1891 memset(md, 0, sizeof(*md));
1894 if (vs->flags & VXLAN_F_REMCSUM_RX)
1895 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1897 if (vs->flags & VXLAN_F_GBP)
1898 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1899 /* Note that GBP and GPE can never be active together. This is
1900 * ensured in vxlan_dev_configure.
1903 if (unparsed.vx_flags || unparsed.vx_vni) {
1904 /* If there are any unprocessed flags remaining treat
1905 * this as a malformed packet. This behavior diverges from
1906 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1907 * in reserved fields are to be ignored. The approach here
1908 * maintains compatibility with previous stack code, and also
1909 * is more robust and provides a little more security in
1910 * adding extensions to VXLAN.
1916 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1919 skb_reset_mac_header(skb);
1920 skb->dev = vxlan->dev;
1921 skb->pkt_type = PACKET_HOST;
1924 oiph = skb_network_header(skb);
1925 skb_reset_network_header(skb);
1927 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1928 ++vxlan->dev->stats.rx_frame_errors;
1929 ++vxlan->dev->stats.rx_errors;
1935 if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1937 atomic_long_inc(&vxlan->dev->rx_dropped);
1941 stats = this_cpu_ptr(vxlan->dev->tstats);
1942 u64_stats_update_begin(&stats->syncp);
1943 stats->rx_packets++;
1944 stats->rx_bytes += skb->len;
1945 u64_stats_update_end(&stats->syncp);
1947 gro_cells_receive(&vxlan->gro_cells, skb);
1954 /* Consume bad packet */
1959 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1960 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1962 struct vxlan_dev *vxlan;
1963 struct vxlan_sock *vs;
1964 struct vxlanhdr *hdr;
1967 if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1970 hdr = vxlan_hdr(skb);
1972 if (!(hdr->vx_flags & VXLAN_HF_VNI))
1975 vs = rcu_dereference_sk_user_data(sk);
1979 vni = vxlan_vni(hdr->vx_vni);
1980 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1987 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1989 struct vxlan_dev *vxlan = netdev_priv(dev);
1990 struct arphdr *parp;
1993 struct neighbour *n;
1995 if (dev->flags & IFF_NOARP)
1998 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1999 dev->stats.tx_dropped++;
2002 parp = arp_hdr(skb);
2004 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
2005 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
2006 parp->ar_pro != htons(ETH_P_IP) ||
2007 parp->ar_op != htons(ARPOP_REQUEST) ||
2008 parp->ar_hln != dev->addr_len ||
2011 arpptr = (u8 *)parp + sizeof(struct arphdr);
2013 arpptr += dev->addr_len; /* sha */
2014 memcpy(&sip, arpptr, sizeof(sip));
2015 arpptr += sizeof(sip);
2016 arpptr += dev->addr_len; /* tha */
2017 memcpy(&tip, arpptr, sizeof(tip));
2019 if (ipv4_is_loopback(tip) ||
2020 ipv4_is_multicast(tip))
2023 n = neigh_lookup(&arp_tbl, &tip, dev);
2026 struct vxlan_fdb *f;
2027 struct sk_buff *reply;
2029 if (!(n->nud_state & NUD_CONNECTED)) {
2034 f = vxlan_find_mac(vxlan, n->ha, vni);
2035 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2036 /* bridge-local neighbor */
2041 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
2049 skb_reset_mac_header(reply);
2050 __skb_pull(reply, skb_network_offset(reply));
2051 reply->ip_summed = CHECKSUM_UNNECESSARY;
2052 reply->pkt_type = PACKET_HOST;
2054 if (netif_rx_ni(reply) == NET_RX_DROP)
2055 dev->stats.rx_dropped++;
2056 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2057 union vxlan_addr ipa = {
2058 .sin.sin_addr.s_addr = tip,
2059 .sin.sin_family = AF_INET,
2062 vxlan_ip_miss(dev, &ipa);
2066 return NETDEV_TX_OK;
2069 #if IS_ENABLED(CONFIG_IPV6)
2070 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
2071 struct neighbour *n, bool isrouter)
2073 struct net_device *dev = request->dev;
2074 struct sk_buff *reply;
2075 struct nd_msg *ns, *na;
2076 struct ipv6hdr *pip6;
2078 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
2082 if (dev == NULL || !pskb_may_pull(request, request->len))
2085 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
2086 sizeof(*na) + na_olen + dev->needed_tailroom;
2087 reply = alloc_skb(len, GFP_ATOMIC);
2091 reply->protocol = htons(ETH_P_IPV6);
2093 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
2094 skb_push(reply, sizeof(struct ethhdr));
2095 skb_reset_mac_header(reply);
2097 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
2099 daddr = eth_hdr(request)->h_source;
2100 ns_olen = request->len - skb_network_offset(request) -
2101 sizeof(struct ipv6hdr) - sizeof(*ns);
2102 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
2103 if (!ns->opt[i + 1]) {
2107 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
2108 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
2113 /* Ethernet header */
2114 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
2115 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
2116 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
2117 reply->protocol = htons(ETH_P_IPV6);
2119 skb_pull(reply, sizeof(struct ethhdr));
2120 skb_reset_network_header(reply);
2121 skb_put(reply, sizeof(struct ipv6hdr));
2125 pip6 = ipv6_hdr(reply);
2126 memset(pip6, 0, sizeof(struct ipv6hdr));
2128 pip6->priority = ipv6_hdr(request)->priority;
2129 pip6->nexthdr = IPPROTO_ICMPV6;
2130 pip6->hop_limit = 255;
2131 pip6->daddr = ipv6_hdr(request)->saddr;
2132 pip6->saddr = *(struct in6_addr *)n->primary_key;
2134 skb_pull(reply, sizeof(struct ipv6hdr));
2135 skb_reset_transport_header(reply);
2137 /* Neighbor Advertisement */
2138 na = skb_put_zero(reply, sizeof(*na) + na_olen);
2139 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
2140 na->icmph.icmp6_router = isrouter;
2141 na->icmph.icmp6_override = 1;
2142 na->icmph.icmp6_solicited = 1;
2143 na->target = ns->target;
2144 ether_addr_copy(&na->opt[2], n->ha);
2145 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
2146 na->opt[1] = na_olen >> 3;
2148 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
2149 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
2150 csum_partial(na, sizeof(*na)+na_olen, 0));
2152 pip6->payload_len = htons(sizeof(*na)+na_olen);
2154 skb_push(reply, sizeof(struct ipv6hdr));
2156 reply->ip_summed = CHECKSUM_UNNECESSARY;
2161 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
2163 struct vxlan_dev *vxlan = netdev_priv(dev);
2164 const struct in6_addr *daddr;
2165 const struct ipv6hdr *iphdr;
2166 struct inet6_dev *in6_dev;
2167 struct neighbour *n;
2170 in6_dev = __in6_dev_get(dev);
2174 iphdr = ipv6_hdr(skb);
2175 daddr = &iphdr->daddr;
2176 msg = (struct nd_msg *)(iphdr + 1);
2178 if (ipv6_addr_loopback(daddr) ||
2179 ipv6_addr_is_multicast(&msg->target))
2182 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
2185 struct vxlan_fdb *f;
2186 struct sk_buff *reply;
2188 if (!(n->nud_state & NUD_CONNECTED)) {
2193 f = vxlan_find_mac(vxlan, n->ha, vni);
2194 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2195 /* bridge-local neighbor */
2200 reply = vxlan_na_create(skb, n,
2201 !!(f ? f->flags & NTF_ROUTER : 0));
2208 if (netif_rx_ni(reply) == NET_RX_DROP)
2209 dev->stats.rx_dropped++;
2211 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2212 union vxlan_addr ipa = {
2213 .sin6.sin6_addr = msg->target,
2214 .sin6.sin6_family = AF_INET6,
2217 vxlan_ip_miss(dev, &ipa);
2222 return NETDEV_TX_OK;
2226 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2228 struct vxlan_dev *vxlan = netdev_priv(dev);
2229 struct neighbour *n;
2231 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2235 switch (ntohs(eth_hdr(skb)->h_proto)) {
2240 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2243 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2244 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2245 union vxlan_addr ipa = {
2246 .sin.sin_addr.s_addr = pip->daddr,
2247 .sin.sin_family = AF_INET,
2250 vxlan_ip_miss(dev, &ipa);
2256 #if IS_ENABLED(CONFIG_IPV6)
2259 struct ipv6hdr *pip6;
2261 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2263 pip6 = ipv6_hdr(skb);
2264 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2265 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2266 union vxlan_addr ipa = {
2267 .sin6.sin6_addr = pip6->daddr,
2268 .sin6.sin6_family = AF_INET6,
2271 vxlan_ip_miss(dev, &ipa);
2285 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2287 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2289 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2298 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
2299 struct vxlan_metadata *md)
2301 struct vxlanhdr_gbp *gbp;
2306 gbp = (struct vxlanhdr_gbp *)vxh;
2307 vxh->vx_flags |= VXLAN_HF_GBP;
2309 if (md->gbp & VXLAN_GBP_DONT_LEARN)
2310 gbp->dont_learn = 1;
2312 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
2313 gbp->policy_applied = 1;
2315 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
2318 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
2321 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2323 gpe->np_applied = 1;
2324 gpe->next_protocol = tun_p_from_eth_p(protocol);
2325 if (!gpe->next_protocol)
2326 return -EPFNOSUPPORT;
2330 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2331 int iphdr_len, __be32 vni,
2332 struct vxlan_metadata *md, u32 vxflags,
2335 struct vxlanhdr *vxh;
2338 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2339 __be16 inner_protocol = htons(ETH_P_TEB);
2341 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2342 skb->ip_summed == CHECKSUM_PARTIAL) {
2343 int csum_start = skb_checksum_start_offset(skb);
2345 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2346 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2347 (skb->csum_offset == offsetof(struct udphdr, check) ||
2348 skb->csum_offset == offsetof(struct tcphdr, check)))
2349 type |= SKB_GSO_TUNNEL_REMCSUM;
2352 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2353 + VXLAN_HLEN + iphdr_len;
2355 /* Need space for new headers (invalidates iph ptr) */
2356 err = skb_cow_head(skb, min_headroom);
2360 err = iptunnel_handle_offloads(skb, type);
2364 vxh = __skb_push(skb, sizeof(*vxh));
2365 vxh->vx_flags = VXLAN_HF_VNI;
2366 vxh->vx_vni = vxlan_vni_field(vni);
2368 if (type & SKB_GSO_TUNNEL_REMCSUM) {
2371 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2372 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2373 vxh->vx_flags |= VXLAN_HF_RCO;
2375 if (!skb_is_gso(skb)) {
2376 skb->ip_summed = CHECKSUM_NONE;
2377 skb->encapsulation = 0;
2381 if (vxflags & VXLAN_F_GBP)
2382 vxlan_build_gbp_hdr(vxh, vxflags, md);
2383 if (vxflags & VXLAN_F_GPE) {
2384 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
2387 inner_protocol = skb->protocol;
2390 skb_set_inner_protocol(skb, inner_protocol);
2394 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2395 struct vxlan_sock *sock4,
2396 struct sk_buff *skb, int oif, u8 tos,
2397 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2398 struct dst_cache *dst_cache,
2399 const struct ip_tunnel_info *info)
2401 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2402 struct rtable *rt = NULL;
2406 return ERR_PTR(-EIO);
2411 rt = dst_cache_get_ip4(dst_cache, saddr);
2416 memset(&fl4, 0, sizeof(fl4));
2417 fl4.flowi4_oif = oif;
2418 fl4.flowi4_tos = RT_TOS(tos);
2419 fl4.flowi4_mark = skb->mark;
2420 fl4.flowi4_proto = IPPROTO_UDP;
2423 fl4.fl4_dport = dport;
2424 fl4.fl4_sport = sport;
2426 rt = ip_route_output_key(vxlan->net, &fl4);
2428 if (rt->dst.dev == dev) {
2429 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2431 return ERR_PTR(-ELOOP);
2436 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2438 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2439 return ERR_PTR(-ENETUNREACH);
2444 #if IS_ENABLED(CONFIG_IPV6)
2445 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2446 struct net_device *dev,
2447 struct vxlan_sock *sock6,
2448 struct sk_buff *skb, int oif, u8 tos,
2450 const struct in6_addr *daddr,
2451 struct in6_addr *saddr,
2452 __be16 dport, __be16 sport,
2453 struct dst_cache *dst_cache,
2454 const struct ip_tunnel_info *info)
2456 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2457 struct dst_entry *ndst;
2461 return ERR_PTR(-EIO);
2466 ndst = dst_cache_get_ip6(dst_cache, saddr);
2471 memset(&fl6, 0, sizeof(fl6));
2472 fl6.flowi6_oif = oif;
2475 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2476 fl6.flowi6_mark = skb->mark;
2477 fl6.flowi6_proto = IPPROTO_UDP;
2478 fl6.fl6_dport = dport;
2479 fl6.fl6_sport = sport;
2481 ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
2483 if (unlikely(IS_ERR(ndst))) {
2484 netdev_dbg(dev, "no route to %pI6\n", daddr);
2485 return ERR_PTR(-ENETUNREACH);
2488 if (unlikely(ndst->dev == dev)) {
2489 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2491 return ERR_PTR(-ELOOP);
2496 dst_cache_set_ip6(dst_cache, ndst, saddr);
2501 /* Bypass encapsulation if the destination is local */
2502 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2503 struct vxlan_dev *dst_vxlan, __be32 vni)
2505 struct pcpu_sw_netstats *tx_stats, *rx_stats;
2506 union vxlan_addr loopback;
2507 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2508 struct net_device *dev;
2511 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2512 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2513 skb->pkt_type = PACKET_HOST;
2514 skb->encapsulation = 0;
2515 skb->dev = dst_vxlan->dev;
2516 __skb_pull(skb, skb_network_offset(skb));
2518 if (remote_ip->sa.sa_family == AF_INET) {
2519 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2520 loopback.sa.sa_family = AF_INET;
2521 #if IS_ENABLED(CONFIG_IPV6)
2523 loopback.sin6.sin6_addr = in6addr_loopback;
2524 loopback.sa.sa_family = AF_INET6;
2530 if (unlikely(!(dev->flags & IFF_UP))) {
2535 if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2536 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2538 u64_stats_update_begin(&tx_stats->syncp);
2539 tx_stats->tx_packets++;
2540 tx_stats->tx_bytes += len;
2541 u64_stats_update_end(&tx_stats->syncp);
2543 if (netif_rx(skb) == NET_RX_SUCCESS) {
2544 u64_stats_update_begin(&rx_stats->syncp);
2545 rx_stats->rx_packets++;
2546 rx_stats->rx_bytes += len;
2547 u64_stats_update_end(&rx_stats->syncp);
2550 dev->stats.rx_dropped++;
2555 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2556 struct vxlan_dev *vxlan,
2557 union vxlan_addr *daddr,
2558 __be16 dst_port, int dst_ifindex, __be32 vni,
2559 struct dst_entry *dst,
2562 #if IS_ENABLED(CONFIG_IPV6)
2563 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2564 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2565 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2567 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2569 /* Bypass encapsulation if the destination is local */
2570 if (rt_flags & RTCF_LOCAL &&
2571 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2572 struct vxlan_dev *dst_vxlan;
2575 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2576 daddr->sa.sa_family, dst_port,
2579 dev->stats.tx_errors++;
2584 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2591 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2592 __be32 default_vni, struct vxlan_rdst *rdst,
2595 struct dst_cache *dst_cache;
2596 struct ip_tunnel_info *info;
2597 struct vxlan_dev *vxlan = netdev_priv(dev);
2598 const struct iphdr *old_iph = ip_hdr(skb);
2599 union vxlan_addr *dst;
2600 union vxlan_addr remote_ip, local_ip;
2601 struct vxlan_metadata _md;
2602 struct vxlan_metadata *md = &_md;
2603 __be16 src_port = 0, dst_port;
2604 struct dst_entry *ndst = NULL;
2609 u32 flags = vxlan->cfg.flags;
2610 bool udp_sum = false;
2611 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2613 info = skb_tunnel_info(skb);
2616 dst = &rdst->remote_ip;
2617 if (vxlan_addr_any(dst)) {
2619 /* short-circuited back to local bridge */
2620 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2626 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2627 vni = (rdst->remote_vni) ? : default_vni;
2628 ifindex = rdst->remote_ifindex;
2629 local_ip = vxlan->cfg.saddr;
2630 dst_cache = &rdst->dst_cache;
2631 md->gbp = skb->mark;
2632 if (flags & VXLAN_F_TTL_INHERIT) {
2633 ttl = ip_tunnel_get_ttl(old_iph, skb);
2635 ttl = vxlan->cfg.ttl;
2636 if (!ttl && vxlan_addr_multicast(dst))
2640 tos = vxlan->cfg.tos;
2642 tos = ip_tunnel_get_dsfield(old_iph, skb);
2644 if (dst->sa.sa_family == AF_INET)
2645 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2647 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2648 label = vxlan->cfg.label;
2651 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2655 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2656 if (remote_ip.sa.sa_family == AF_INET) {
2657 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2658 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2660 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2661 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2664 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2665 vni = tunnel_id_to_key32(info->key.tun_id);
2667 dst_cache = &info->dst_cache;
2668 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
2669 if (info->options_len < sizeof(*md))
2671 md = ip_tunnel_info_opts(info);
2673 ttl = info->key.ttl;
2674 tos = info->key.tos;
2675 label = info->key.label;
2676 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2678 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2679 vxlan->cfg.port_max, true);
2682 if (dst->sa.sa_family == AF_INET) {
2683 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2688 ifindex = sock4->sock->sk->sk_bound_dev_if;
2690 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2691 dst->sin.sin_addr.s_addr,
2692 &local_ip.sin.sin_addr.s_addr,
2701 /* Bypass encapsulation if the destination is local */
2702 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2703 dst_port, ifindex, vni,
2704 &rt->dst, rt->rt_flags);
2708 if (vxlan->cfg.df == VXLAN_DF_SET) {
2710 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2711 struct ethhdr *eth = eth_hdr(skb);
2713 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2714 (ntohs(eth->h_proto) == ETH_P_IP &&
2715 old_iph->frag_off & htons(IP_DF)))
2718 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2723 skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
2725 tos = ip_tunnel_ecn_encap(RT_TOS(tos), old_iph, skb);
2726 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2727 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2728 vni, md, flags, udp_sum);
2732 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2733 dst->sin.sin_addr.s_addr, tos, ttl, df,
2734 src_port, dst_port, xnet, !udp_sum);
2735 #if IS_ENABLED(CONFIG_IPV6)
2737 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2740 ifindex = sock6->sock->sk->sk_bound_dev_if;
2742 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2743 label, &dst->sin6.sin6_addr,
2744 &local_ip.sin6.sin6_addr,
2748 err = PTR_ERR(ndst);
2754 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2756 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2757 dst_port, ifindex, vni,
2763 skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
2765 tos = ip_tunnel_ecn_encap(RT_TOS(tos), old_iph, skb);
2766 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2767 skb_scrub_packet(skb, xnet);
2768 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2769 vni, md, flags, udp_sum);
2773 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2774 &local_ip.sin6.sin6_addr,
2775 &dst->sin6.sin6_addr, tos, ttl,
2776 label, src_port, dst_port, !udp_sum);
2784 dev->stats.tx_dropped++;
2791 dev->stats.collisions++;
2792 else if (err == -ENETUNREACH)
2793 dev->stats.tx_carrier_errors++;
2795 dev->stats.tx_errors++;
2799 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
2800 struct vxlan_fdb *f, __be32 vni, bool did_rsc)
2802 struct vxlan_rdst nh_rdst;
2807 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
2808 hash = skb_get_hash(skb);
2811 nh = rcu_dereference(f->nh);
2816 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
2819 if (likely(do_xmit))
2820 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
2827 dev->stats.tx_dropped++;
2831 /* Transmit local packets over Vxlan
2833 * Outer IP header inherits ECN and DF from inner header.
2834 * Outer UDP destination is the VXLAN assigned port.
2835 * source port is based on hash of flow
2837 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2839 struct vxlan_dev *vxlan = netdev_priv(dev);
2840 struct vxlan_rdst *rdst, *fdst = NULL;
2841 const struct ip_tunnel_info *info;
2842 bool did_rsc = false;
2843 struct vxlan_fdb *f;
2847 info = skb_tunnel_info(skb);
2849 skb_reset_mac_header(skb);
2851 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2852 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2853 info->mode & IP_TUNNEL_INFO_TX) {
2854 vni = tunnel_id_to_key32(info->key.tun_id);
2856 if (info && info->mode & IP_TUNNEL_INFO_TX)
2857 vxlan_xmit_one(skb, dev, vni, NULL, false);
2860 return NETDEV_TX_OK;
2864 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2866 if (ntohs(eth->h_proto) == ETH_P_ARP)
2867 return arp_reduce(dev, skb, vni);
2868 #if IS_ENABLED(CONFIG_IPV6)
2869 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2870 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2871 sizeof(struct nd_msg)) &&
2872 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2873 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2875 if (m->icmph.icmp6_code == 0 &&
2876 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2877 return neigh_reduce(dev, skb, vni);
2883 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2886 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2887 (ntohs(eth->h_proto) == ETH_P_IP ||
2888 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2889 did_rsc = route_shortcircuit(dev, skb);
2891 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2895 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2897 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2898 !is_multicast_ether_addr(eth->h_dest))
2899 vxlan_fdb_miss(vxlan, eth->h_dest);
2901 dev->stats.tx_dropped++;
2903 return NETDEV_TX_OK;
2907 if (rcu_access_pointer(f->nh)) {
2908 vxlan_xmit_nh(skb, dev, f,
2909 (vni ? : vxlan->default_dst.remote_vni), did_rsc);
2911 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2912 struct sk_buff *skb1;
2918 skb1 = skb_clone(skb, GFP_ATOMIC);
2920 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2923 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2928 return NETDEV_TX_OK;
2931 /* Walk the forwarding table and purge stale entries */
2932 static void vxlan_cleanup(struct timer_list *t)
2934 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2935 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2938 if (!netif_running(vxlan->dev))
2941 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2942 struct hlist_node *p, *n;
2944 spin_lock(&vxlan->hash_lock[h]);
2945 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2947 = container_of(p, struct vxlan_fdb, hlist);
2948 unsigned long timeout;
2950 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2953 if (f->flags & NTF_EXT_LEARNED)
2956 timeout = f->used + vxlan->cfg.age_interval * HZ;
2957 if (time_before_eq(timeout, jiffies)) {
2958 netdev_dbg(vxlan->dev,
2959 "garbage collect %pM\n",
2961 f->state = NUD_STALE;
2962 vxlan_fdb_destroy(vxlan, f, true, true);
2963 } else if (time_before(timeout, next_timer))
2964 next_timer = timeout;
2966 spin_unlock(&vxlan->hash_lock[h]);
2969 mod_timer(&vxlan->age_timer, next_timer);
2972 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2974 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2976 spin_lock(&vn->sock_lock);
2977 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2978 #if IS_ENABLED(CONFIG_IPV6)
2979 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2981 spin_unlock(&vn->sock_lock);
2984 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2985 struct vxlan_dev_node *node)
2987 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2988 __be32 vni = vxlan->default_dst.remote_vni;
2990 node->vxlan = vxlan;
2991 spin_lock(&vn->sock_lock);
2992 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2993 spin_unlock(&vn->sock_lock);
2996 /* Setup stats when device is created */
2997 static int vxlan_init(struct net_device *dev)
2999 struct vxlan_dev *vxlan = netdev_priv(dev);
3002 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3006 err = gro_cells_init(&vxlan->gro_cells, dev);
3008 free_percpu(dev->tstats);
3015 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
3017 struct vxlan_fdb *f;
3018 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
3020 spin_lock_bh(&vxlan->hash_lock[hash_index]);
3021 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
3023 vxlan_fdb_destroy(vxlan, f, true, true);
3024 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
3027 static void vxlan_uninit(struct net_device *dev)
3029 struct vxlan_dev *vxlan = netdev_priv(dev);
3031 gro_cells_destroy(&vxlan->gro_cells);
3033 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
3035 free_percpu(dev->tstats);
3038 /* Start ageing timer and join group when device is brought up */
3039 static int vxlan_open(struct net_device *dev)
3041 struct vxlan_dev *vxlan = netdev_priv(dev);
3044 ret = vxlan_sock_add(vxlan);
3048 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
3049 ret = vxlan_igmp_join(vxlan);
3050 if (ret == -EADDRINUSE)
3053 vxlan_sock_release(vxlan);
3058 if (vxlan->cfg.age_interval)
3059 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
3064 /* Purge the forwarding table */
3065 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
3069 for (h = 0; h < FDB_HASH_SIZE; ++h) {
3070 struct hlist_node *p, *n;
3072 spin_lock_bh(&vxlan->hash_lock[h]);
3073 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
3075 = container_of(p, struct vxlan_fdb, hlist);
3076 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
3078 /* the all_zeros_mac entry is deleted at vxlan_uninit */
3079 if (is_zero_ether_addr(f->eth_addr) &&
3080 f->vni == vxlan->cfg.vni)
3082 vxlan_fdb_destroy(vxlan, f, true, true);
3084 spin_unlock_bh(&vxlan->hash_lock[h]);
3088 /* Cleanup timer and forwarding table on shutdown */
3089 static int vxlan_stop(struct net_device *dev)
3091 struct vxlan_dev *vxlan = netdev_priv(dev);
3092 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3095 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
3096 !vxlan_group_used(vn, vxlan))
3097 ret = vxlan_igmp_leave(vxlan);
3099 del_timer_sync(&vxlan->age_timer);
3101 vxlan_flush(vxlan, false);
3102 vxlan_sock_release(vxlan);
3107 /* Stub, nothing needs to be done. */
3108 static void vxlan_set_multicast_list(struct net_device *dev)
3112 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
3114 struct vxlan_dev *vxlan = netdev_priv(dev);
3115 struct vxlan_rdst *dst = &vxlan->default_dst;
3116 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3117 dst->remote_ifindex);
3118 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
3120 /* This check is different than dev->max_mtu, because it looks at
3121 * the lowerdev->mtu, rather than the static dev->max_mtu
3124 int max_mtu = lowerdev->mtu -
3125 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
3126 if (new_mtu > max_mtu)
3134 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
3136 struct vxlan_dev *vxlan = netdev_priv(dev);
3137 struct ip_tunnel_info *info = skb_tunnel_info(skb);
3138 __be16 sport, dport;
3140 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
3141 vxlan->cfg.port_max, true);
3142 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
3144 if (ip_tunnel_info_af(info) == AF_INET) {
3145 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
3148 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
3149 info->key.u.ipv4.dst,
3150 &info->key.u.ipv4.src, dport, sport,
3151 &info->dst_cache, info);
3156 #if IS_ENABLED(CONFIG_IPV6)
3157 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
3158 struct dst_entry *ndst;
3160 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
3161 info->key.label, &info->key.u.ipv6.dst,
3162 &info->key.u.ipv6.src, dport, sport,
3163 &info->dst_cache, info);
3165 return PTR_ERR(ndst);
3167 #else /* !CONFIG_IPV6 */
3168 return -EPFNOSUPPORT;
3171 info->key.tp_src = sport;
3172 info->key.tp_dst = dport;
3176 static const struct net_device_ops vxlan_netdev_ether_ops = {
3177 .ndo_init = vxlan_init,
3178 .ndo_uninit = vxlan_uninit,
3179 .ndo_open = vxlan_open,
3180 .ndo_stop = vxlan_stop,
3181 .ndo_start_xmit = vxlan_xmit,
3182 .ndo_get_stats64 = ip_tunnel_get_stats64,
3183 .ndo_set_rx_mode = vxlan_set_multicast_list,
3184 .ndo_change_mtu = vxlan_change_mtu,
3185 .ndo_validate_addr = eth_validate_addr,
3186 .ndo_set_mac_address = eth_mac_addr,
3187 .ndo_fdb_add = vxlan_fdb_add,
3188 .ndo_fdb_del = vxlan_fdb_delete,
3189 .ndo_fdb_dump = vxlan_fdb_dump,
3190 .ndo_fdb_get = vxlan_fdb_get,
3191 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
3192 .ndo_change_proto_down = dev_change_proto_down_generic,
3195 static const struct net_device_ops vxlan_netdev_raw_ops = {
3196 .ndo_init = vxlan_init,
3197 .ndo_uninit = vxlan_uninit,
3198 .ndo_open = vxlan_open,
3199 .ndo_stop = vxlan_stop,
3200 .ndo_start_xmit = vxlan_xmit,
3201 .ndo_get_stats64 = ip_tunnel_get_stats64,
3202 .ndo_change_mtu = vxlan_change_mtu,
3203 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
3206 /* Info for udev, that this is a virtual tunnel endpoint */
3207 static struct device_type vxlan_type = {
3211 /* Calls the ndo_udp_tunnel_add of the caller in order to
3212 * supply the listening VXLAN udp ports. Callers are expected
3213 * to implement the ndo_udp_tunnel_add.
3215 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
3217 struct vxlan_sock *vs;
3218 struct net *net = dev_net(dev);
3219 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3222 spin_lock(&vn->sock_lock);
3223 for (i = 0; i < PORT_HASH_SIZE; ++i) {
3224 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
3225 unsigned short type;
3227 if (vs->flags & VXLAN_F_GPE)
3228 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3230 type = UDP_TUNNEL_TYPE_VXLAN;
3233 udp_tunnel_push_rx_port(dev, vs->sock, type);
3235 udp_tunnel_drop_rx_port(dev, vs->sock, type);
3238 spin_unlock(&vn->sock_lock);
3241 /* Initialize the device structure. */
3242 static void vxlan_setup(struct net_device *dev)
3244 struct vxlan_dev *vxlan = netdev_priv(dev);
3247 eth_hw_addr_random(dev);
3250 dev->needs_free_netdev = true;
3251 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3253 dev->features |= NETIF_F_LLTX;
3254 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
3255 dev->features |= NETIF_F_RXCSUM;
3256 dev->features |= NETIF_F_GSO_SOFTWARE;
3258 dev->vlan_features = dev->features;
3259 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
3260 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3261 netif_keep_dst(dev);
3262 dev->priv_flags |= IFF_NO_QUEUE;
3264 /* MTU range: 68 - 65535 */
3265 dev->min_mtu = ETH_MIN_MTU;
3266 dev->max_mtu = ETH_MAX_MTU;
3268 INIT_LIST_HEAD(&vxlan->next);
3270 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3274 for (h = 0; h < FDB_HASH_SIZE; ++h) {
3275 spin_lock_init(&vxlan->hash_lock[h]);
3276 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3280 static void vxlan_ether_setup(struct net_device *dev)
3282 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3283 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3284 dev->netdev_ops = &vxlan_netdev_ether_ops;
3287 static void vxlan_raw_setup(struct net_device *dev)
3289 dev->header_ops = NULL;
3290 dev->type = ARPHRD_NONE;
3291 dev->hard_header_len = 0;
3293 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3294 dev->netdev_ops = &vxlan_netdev_raw_ops;
3297 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3298 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
3299 [IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) },
3300 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
3301 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
3302 [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) },
3303 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
3304 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
3305 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
3306 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
3307 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
3308 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
3309 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
3310 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
3311 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
3312 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
3313 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
3314 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
3315 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
3316 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
3317 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
3318 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
3319 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
3320 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
3321 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3322 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
3323 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
3324 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
3325 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
3326 [IFLA_VXLAN_DF] = { .type = NLA_U8 },
3329 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3330 struct netlink_ext_ack *extack)
3332 if (tb[IFLA_ADDRESS]) {
3333 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3334 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3335 "Provided link layer address is not Ethernet");
3339 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3340 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3341 "Provided Ethernet address is not unicast");
3342 return -EADDRNOTAVAIL;
3347 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3349 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3350 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3351 "MTU must be between 68 and 65535");
3357 NL_SET_ERR_MSG(extack,
3358 "Required attributes not provided to perform the operation");
3362 if (data[IFLA_VXLAN_ID]) {
3363 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3365 if (id >= VXLAN_N_VID) {
3366 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
3367 "VXLAN ID must be lower than 16777216");
3372 if (data[IFLA_VXLAN_PORT_RANGE]) {
3373 const struct ifla_vxlan_port_range *p
3374 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3376 if (ntohs(p->high) < ntohs(p->low)) {
3377 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
3378 "Invalid source port range");
3383 if (data[IFLA_VXLAN_DF]) {
3384 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3386 if (df < 0 || df > VXLAN_DF_MAX) {
3387 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
3388 "Invalid DF attribute");
3396 static void vxlan_get_drvinfo(struct net_device *netdev,
3397 struct ethtool_drvinfo *drvinfo)
3399 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3400 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3403 static int vxlan_get_link_ksettings(struct net_device *dev,
3404 struct ethtool_link_ksettings *cmd)
3406 struct vxlan_dev *vxlan = netdev_priv(dev);
3407 struct vxlan_rdst *dst = &vxlan->default_dst;
3408 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3409 dst->remote_ifindex);
3412 cmd->base.duplex = DUPLEX_UNKNOWN;
3413 cmd->base.port = PORT_OTHER;
3414 cmd->base.speed = SPEED_UNKNOWN;
3419 return __ethtool_get_link_ksettings(lowerdev, cmd);
3422 static const struct ethtool_ops vxlan_ethtool_ops = {
3423 .get_drvinfo = vxlan_get_drvinfo,
3424 .get_link = ethtool_op_get_link,
3425 .get_link_ksettings = vxlan_get_link_ksettings,
3428 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3429 __be16 port, u32 flags, int ifindex)
3431 struct socket *sock;
3432 struct udp_port_cfg udp_conf;
3435 memset(&udp_conf, 0, sizeof(udp_conf));
3438 udp_conf.family = AF_INET6;
3439 udp_conf.use_udp6_rx_checksums =
3440 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3441 udp_conf.ipv6_v6only = 1;
3443 udp_conf.family = AF_INET;
3446 udp_conf.local_udp_port = port;
3447 udp_conf.bind_ifindex = ifindex;
3449 /* Open UDP socket */
3450 err = udp_sock_create(net, &udp_conf, &sock);
3452 return ERR_PTR(err);
3457 /* Create new listen socket if needed */
3458 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3459 __be16 port, u32 flags,
3462 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3463 struct vxlan_sock *vs;
3464 struct socket *sock;
3466 struct udp_tunnel_sock_cfg tunnel_cfg;
3468 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3470 return ERR_PTR(-ENOMEM);
3472 for (h = 0; h < VNI_HASH_SIZE; ++h)
3473 INIT_HLIST_HEAD(&vs->vni_list[h]);
3475 sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3478 return ERR_CAST(sock);
3482 refcount_set(&vs->refcnt, 1);
3483 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3485 spin_lock(&vn->sock_lock);
3486 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3487 udp_tunnel_notify_add_rx_port(sock,
3488 (vs->flags & VXLAN_F_GPE) ?
3489 UDP_TUNNEL_TYPE_VXLAN_GPE :
3490 UDP_TUNNEL_TYPE_VXLAN);
3491 spin_unlock(&vn->sock_lock);
3493 /* Mark socket as an encapsulation socket. */
3494 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3495 tunnel_cfg.sk_user_data = vs;
3496 tunnel_cfg.encap_type = 1;
3497 tunnel_cfg.encap_rcv = vxlan_rcv;
3498 tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3499 tunnel_cfg.encap_destroy = NULL;
3500 tunnel_cfg.gro_receive = vxlan_gro_receive;
3501 tunnel_cfg.gro_complete = vxlan_gro_complete;
3503 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3508 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3510 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3511 struct vxlan_sock *vs = NULL;
3512 struct vxlan_dev_node *node;
3513 int l3mdev_index = 0;
3515 if (vxlan->cfg.remote_ifindex)
3516 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3517 vxlan->net, vxlan->cfg.remote_ifindex);
3519 if (!vxlan->cfg.no_share) {
3520 spin_lock(&vn->sock_lock);
3521 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3522 vxlan->cfg.dst_port, vxlan->cfg.flags,
3524 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3525 spin_unlock(&vn->sock_lock);
3528 spin_unlock(&vn->sock_lock);
3531 vs = vxlan_socket_create(vxlan->net, ipv6,
3532 vxlan->cfg.dst_port, vxlan->cfg.flags,
3536 #if IS_ENABLED(CONFIG_IPV6)
3538 rcu_assign_pointer(vxlan->vn6_sock, vs);
3539 node = &vxlan->hlist6;
3543 rcu_assign_pointer(vxlan->vn4_sock, vs);
3544 node = &vxlan->hlist4;
3546 vxlan_vs_add_dev(vs, vxlan, node);
3550 static int vxlan_sock_add(struct vxlan_dev *vxlan)
3552 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3553 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3554 bool ipv4 = !ipv6 || metadata;
3557 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3558 #if IS_ENABLED(CONFIG_IPV6)
3559 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3561 ret = __vxlan_sock_add(vxlan, true);
3562 if (ret < 0 && ret != -EAFNOSUPPORT)
3567 ret = __vxlan_sock_add(vxlan, false);
3569 vxlan_sock_release(vxlan);
3573 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3574 struct net_device **lower,
3575 struct vxlan_dev *old,
3576 struct netlink_ext_ack *extack)
3578 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3579 struct vxlan_dev *tmp;
3580 bool use_ipv6 = false;
3582 if (conf->flags & VXLAN_F_GPE) {
3583 /* For now, allow GPE only together with
3584 * COLLECT_METADATA. This can be relaxed later; in such
3585 * case, the other side of the PtP link will have to be
3588 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3589 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3590 NL_SET_ERR_MSG(extack,
3591 "VXLAN GPE does not support this combination of attributes");
3596 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3597 /* Unless IPv6 is explicitly requested, assume IPv4 */
3598 conf->remote_ip.sa.sa_family = AF_INET;
3599 conf->saddr.sa.sa_family = AF_INET;
3600 } else if (!conf->remote_ip.sa.sa_family) {
3601 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3602 } else if (!conf->saddr.sa.sa_family) {
3603 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3606 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3607 NL_SET_ERR_MSG(extack,
3608 "Local and remote address must be from the same family");
3612 if (vxlan_addr_multicast(&conf->saddr)) {
3613 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3617 if (conf->saddr.sa.sa_family == AF_INET6) {
3618 if (!IS_ENABLED(CONFIG_IPV6)) {
3619 NL_SET_ERR_MSG(extack,
3620 "IPv6 support not enabled in the kernel");
3621 return -EPFNOSUPPORT;
3624 conf->flags |= VXLAN_F_IPV6;
3626 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3628 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3630 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3632 if (local_type & IPV6_ADDR_LINKLOCAL) {
3633 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3634 (remote_type != IPV6_ADDR_ANY)) {
3635 NL_SET_ERR_MSG(extack,
3636 "Invalid combination of local and remote address scopes");
3640 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3643 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3644 NL_SET_ERR_MSG(extack,
3645 "Invalid combination of local and remote address scopes");
3649 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3654 if (conf->label && !use_ipv6) {
3655 NL_SET_ERR_MSG(extack,
3656 "Label attribute only applies to IPv6 VXLAN devices");
3660 if (conf->remote_ifindex) {
3661 struct net_device *lowerdev;
3663 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3665 NL_SET_ERR_MSG(extack,
3666 "Invalid local interface, device not found");
3670 #if IS_ENABLED(CONFIG_IPV6)
3672 struct inet6_dev *idev = __in6_dev_get(lowerdev);
3673 if (idev && idev->cnf.disable_ipv6) {
3674 NL_SET_ERR_MSG(extack,
3675 "IPv6 support disabled by administrator");
3683 if (vxlan_addr_multicast(&conf->remote_ip)) {
3684 NL_SET_ERR_MSG(extack,
3685 "Local interface required for multicast remote destination");
3690 #if IS_ENABLED(CONFIG_IPV6)
3691 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3692 NL_SET_ERR_MSG(extack,
3693 "Local interface required for link-local local/remote addresses");
3701 if (!conf->dst_port) {
3702 if (conf->flags & VXLAN_F_GPE)
3703 conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3705 conf->dst_port = htons(vxlan_port);
3708 if (!conf->age_interval)
3709 conf->age_interval = FDB_AGE_DEFAULT;
3711 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3715 if (tmp->cfg.vni != conf->vni)
3717 if (tmp->cfg.dst_port != conf->dst_port)
3719 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3720 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3723 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3724 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3727 NL_SET_ERR_MSG(extack,
3728 "A VXLAN device with the specified VNI already exists");
3735 static void vxlan_config_apply(struct net_device *dev,
3736 struct vxlan_config *conf,
3737 struct net_device *lowerdev,
3738 struct net *src_net,
3741 struct vxlan_dev *vxlan = netdev_priv(dev);
3742 struct vxlan_rdst *dst = &vxlan->default_dst;
3743 unsigned short needed_headroom = ETH_HLEN;
3744 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3745 int max_mtu = ETH_MAX_MTU;
3748 if (conf->flags & VXLAN_F_GPE)
3749 vxlan_raw_setup(dev);
3751 vxlan_ether_setup(dev);
3754 dev->mtu = conf->mtu;
3756 vxlan->net = src_net;
3759 dst->remote_vni = conf->vni;
3761 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3764 dst->remote_ifindex = conf->remote_ifindex;
3766 dev->gso_max_size = lowerdev->gso_max_size;
3767 dev->gso_max_segs = lowerdev->gso_max_segs;
3769 needed_headroom = lowerdev->hard_header_len;
3771 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3773 if (max_mtu < ETH_MIN_MTU)
3774 max_mtu = ETH_MIN_MTU;
3776 if (!changelink && !conf->mtu)
3780 if (dev->mtu > max_mtu)
3783 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3784 needed_headroom += VXLAN6_HEADROOM;
3786 needed_headroom += VXLAN_HEADROOM;
3787 dev->needed_headroom = needed_headroom;
3789 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3792 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3793 struct vxlan_config *conf, bool changelink,
3794 struct netlink_ext_ack *extack)
3796 struct vxlan_dev *vxlan = netdev_priv(dev);
3797 struct net_device *lowerdev;
3800 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3804 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3809 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3810 struct vxlan_config *conf,
3811 struct netlink_ext_ack *extack)
3813 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3814 struct vxlan_dev *vxlan = netdev_priv(dev);
3815 struct net_device *remote_dev = NULL;
3816 struct vxlan_fdb *f = NULL;
3817 bool unregister = false;
3818 struct vxlan_rdst *dst;
3821 dst = &vxlan->default_dst;
3822 err = vxlan_dev_configure(net, dev, conf, false, extack);
3826 dev->ethtool_ops = &vxlan_ethtool_ops;
3828 /* create an fdb entry for a valid default destination */
3829 if (!vxlan_addr_any(&dst->remote_ip)) {
3830 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3832 NUD_REACHABLE | NUD_PERMANENT,
3833 vxlan->cfg.dst_port,
3836 dst->remote_ifindex,
3837 NTF_SELF, 0, &f, extack);
3842 err = register_netdevice(dev);
3847 if (dst->remote_ifindex) {
3848 remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
3852 err = netdev_upper_dev_link(remote_dev, dev, extack);
3857 err = rtnl_configure_link(dev, NULL);
3862 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
3864 /* notify default fdb entry */
3865 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
3866 RTM_NEWNEIGH, true, extack);
3868 vxlan_fdb_destroy(vxlan, f, false, false);
3870 netdev_upper_dev_unlink(remote_dev, dev);
3875 list_add(&vxlan->next, &vn->vxlan_list);
3877 dst->remote_dev = remote_dev;
3881 netdev_upper_dev_unlink(remote_dev, dev);
3883 /* unregister_netdevice() destroys the default FDB entry with deletion
3884 * notification. But the addition notification was not sent yet, so
3885 * destroy the entry by hand here.
3888 __vxlan_fdb_free(f);
3891 unregister_netdevice(dev);
3895 /* Set/clear flags based on attribute */
3896 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
3897 int attrtype, unsigned long mask, bool changelink,
3898 bool changelink_supported,
3899 struct netlink_ext_ack *extack)
3901 unsigned long flags;
3906 if (changelink && !changelink_supported) {
3907 vxlan_flag_attr_error(attrtype, extack);
3911 if (vxlan_policy[attrtype].type == NLA_FLAG)
3912 flags = conf->flags | mask;
3913 else if (nla_get_u8(tb[attrtype]))
3914 flags = conf->flags | mask;
3916 flags = conf->flags & ~mask;
3918 conf->flags = flags;
3923 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3924 struct net_device *dev, struct vxlan_config *conf,
3925 bool changelink, struct netlink_ext_ack *extack)
3927 struct vxlan_dev *vxlan = netdev_priv(dev);
3930 memset(conf, 0, sizeof(*conf));
3932 /* if changelink operation, start with old existing cfg */
3934 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3936 if (data[IFLA_VXLAN_ID]) {
3937 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3939 if (changelink && (vni != conf->vni)) {
3940 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
3943 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3946 if (data[IFLA_VXLAN_GROUP]) {
3947 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
3948 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
3952 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3953 conf->remote_ip.sa.sa_family = AF_INET;
3954 } else if (data[IFLA_VXLAN_GROUP6]) {
3955 if (!IS_ENABLED(CONFIG_IPV6)) {
3956 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
3957 return -EPFNOSUPPORT;
3960 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
3961 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
3965 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3966 conf->remote_ip.sa.sa_family = AF_INET6;
3969 if (data[IFLA_VXLAN_LOCAL]) {
3970 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
3971 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
3975 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3976 conf->saddr.sa.sa_family = AF_INET;
3977 } else if (data[IFLA_VXLAN_LOCAL6]) {
3978 if (!IS_ENABLED(CONFIG_IPV6)) {
3979 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
3980 return -EPFNOSUPPORT;
3983 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
3984 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
3988 /* TODO: respect scope id */
3989 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3990 conf->saddr.sa.sa_family = AF_INET6;
3993 if (data[IFLA_VXLAN_LINK])
3994 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3996 if (data[IFLA_VXLAN_TOS])
3997 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3999 if (data[IFLA_VXLAN_TTL])
4000 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
4002 if (data[IFLA_VXLAN_TTL_INHERIT]) {
4003 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
4004 VXLAN_F_TTL_INHERIT, changelink, false,
4011 if (data[IFLA_VXLAN_LABEL])
4012 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
4013 IPV6_FLOWLABEL_MASK;
4015 if (data[IFLA_VXLAN_LEARNING]) {
4016 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
4017 VXLAN_F_LEARN, changelink, true,
4021 } else if (!changelink) {
4022 /* default to learn on a new device */
4023 conf->flags |= VXLAN_F_LEARN;
4026 if (data[IFLA_VXLAN_AGEING])
4027 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
4029 if (data[IFLA_VXLAN_PROXY]) {
4030 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
4031 VXLAN_F_PROXY, changelink, false,
4037 if (data[IFLA_VXLAN_RSC]) {
4038 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
4039 VXLAN_F_RSC, changelink, false,
4045 if (data[IFLA_VXLAN_L2MISS]) {
4046 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
4047 VXLAN_F_L2MISS, changelink, false,
4053 if (data[IFLA_VXLAN_L3MISS]) {
4054 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
4055 VXLAN_F_L3MISS, changelink, false,
4061 if (data[IFLA_VXLAN_LIMIT]) {
4063 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
4064 "Cannot change limit");
4067 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
4070 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
4071 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
4072 VXLAN_F_COLLECT_METADATA, changelink, false,
4078 if (data[IFLA_VXLAN_PORT_RANGE]) {
4080 const struct ifla_vxlan_port_range *p
4081 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
4082 conf->port_min = ntohs(p->low);
4083 conf->port_max = ntohs(p->high);
4085 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
4086 "Cannot change port range");
4091 if (data[IFLA_VXLAN_PORT]) {
4093 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
4094 "Cannot change port");
4097 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
4100 if (data[IFLA_VXLAN_UDP_CSUM]) {
4102 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
4103 "Cannot change UDP_CSUM flag");
4106 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
4107 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
4110 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
4111 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4112 VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
4118 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
4119 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4120 VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
4126 if (data[IFLA_VXLAN_REMCSUM_TX]) {
4127 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
4128 VXLAN_F_REMCSUM_TX, changelink, false,
4134 if (data[IFLA_VXLAN_REMCSUM_RX]) {
4135 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
4136 VXLAN_F_REMCSUM_RX, changelink, false,
4142 if (data[IFLA_VXLAN_GBP]) {
4143 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
4144 VXLAN_F_GBP, changelink, false, extack);
4149 if (data[IFLA_VXLAN_GPE]) {
4150 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
4151 VXLAN_F_GPE, changelink, false,
4157 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
4158 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
4159 VXLAN_F_REMCSUM_NOPARTIAL, changelink,
4167 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
4168 "Cannot change mtu");
4171 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
4174 if (data[IFLA_VXLAN_DF])
4175 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
4180 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
4181 struct nlattr *tb[], struct nlattr *data[],
4182 struct netlink_ext_ack *extack)
4184 struct vxlan_config conf;
4187 err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
4191 return __vxlan_dev_create(src_net, dev, &conf, extack);
4194 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
4195 struct nlattr *data[],
4196 struct netlink_ext_ack *extack)
4198 struct vxlan_dev *vxlan = netdev_priv(dev);
4199 struct net_device *lowerdev;
4200 struct vxlan_config conf;
4201 struct vxlan_rdst *dst;
4204 dst = &vxlan->default_dst;
4205 err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
4209 err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
4214 if (dst->remote_dev == lowerdev)
4217 err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
4222 /* handle default dst entry */
4223 if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
4224 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
4226 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4227 if (!vxlan_addr_any(&conf.remote_ip)) {
4228 err = vxlan_fdb_update(vxlan, all_zeros_mac,
4230 NUD_REACHABLE | NUD_PERMANENT,
4231 NLM_F_APPEND | NLM_F_CREATE,
4232 vxlan->cfg.dst_port,
4234 conf.remote_ifindex,
4235 NTF_SELF, 0, true, extack);
4237 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4238 netdev_adjacent_change_abort(dst->remote_dev,
4243 if (!vxlan_addr_any(&dst->remote_ip))
4244 __vxlan_fdb_delete(vxlan, all_zeros_mac,
4246 vxlan->cfg.dst_port,
4249 dst->remote_ifindex,
4251 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4254 if (conf.age_interval != vxlan->cfg.age_interval)
4255 mod_timer(&vxlan->age_timer, jiffies);
4257 netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
4258 if (lowerdev && lowerdev != dst->remote_dev)
4259 dst->remote_dev = lowerdev;
4260 vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
4264 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
4266 struct vxlan_dev *vxlan = netdev_priv(dev);
4268 vxlan_flush(vxlan, true);
4270 list_del(&vxlan->next);
4271 unregister_netdevice_queue(dev, head);
4272 if (vxlan->default_dst.remote_dev)
4273 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
4276 static size_t vxlan_get_size(const struct net_device *dev)
4279 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
4280 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4281 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
4282 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4283 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
4284 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */
4285 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
4286 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */
4287 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4288 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
4289 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
4290 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
4291 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
4292 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
4293 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
4294 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
4295 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
4296 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4297 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4298 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4299 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4300 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4301 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4302 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4306 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4308 const struct vxlan_dev *vxlan = netdev_priv(dev);
4309 const struct vxlan_rdst *dst = &vxlan->default_dst;
4310 struct ifla_vxlan_port_range ports = {
4311 .low = htons(vxlan->cfg.port_min),
4312 .high = htons(vxlan->cfg.port_max),
4315 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4316 goto nla_put_failure;
4318 if (!vxlan_addr_any(&dst->remote_ip)) {
4319 if (dst->remote_ip.sa.sa_family == AF_INET) {
4320 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4321 dst->remote_ip.sin.sin_addr.s_addr))
4322 goto nla_put_failure;
4323 #if IS_ENABLED(CONFIG_IPV6)
4325 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4326 &dst->remote_ip.sin6.sin6_addr))
4327 goto nla_put_failure;
4332 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4333 goto nla_put_failure;
4335 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4336 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4337 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4338 vxlan->cfg.saddr.sin.sin_addr.s_addr))
4339 goto nla_put_failure;
4340 #if IS_ENABLED(CONFIG_IPV6)
4342 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4343 &vxlan->cfg.saddr.sin6.sin6_addr))
4344 goto nla_put_failure;
4349 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4350 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4351 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4352 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4353 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4354 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4355 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4356 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4357 nla_put_u8(skb, IFLA_VXLAN_PROXY,
4358 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4359 nla_put_u8(skb, IFLA_VXLAN_RSC,
4360 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4361 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4362 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4363 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4364 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4365 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4366 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4367 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4368 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4369 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4370 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4371 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4372 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4373 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4374 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4375 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4376 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4377 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4378 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4379 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
4380 goto nla_put_failure;
4382 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4383 goto nla_put_failure;
4385 if (vxlan->cfg.flags & VXLAN_F_GBP &&
4386 nla_put_flag(skb, IFLA_VXLAN_GBP))
4387 goto nla_put_failure;
4389 if (vxlan->cfg.flags & VXLAN_F_GPE &&
4390 nla_put_flag(skb, IFLA_VXLAN_GPE))
4391 goto nla_put_failure;
4393 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4394 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4395 goto nla_put_failure;
4403 static struct net *vxlan_get_link_net(const struct net_device *dev)
4405 struct vxlan_dev *vxlan = netdev_priv(dev);
4410 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4412 .maxtype = IFLA_VXLAN_MAX,
4413 .policy = vxlan_policy,
4414 .priv_size = sizeof(struct vxlan_dev),
4415 .setup = vxlan_setup,
4416 .validate = vxlan_validate,
4417 .newlink = vxlan_newlink,
4418 .changelink = vxlan_changelink,
4419 .dellink = vxlan_dellink,
4420 .get_size = vxlan_get_size,
4421 .fill_info = vxlan_fill_info,
4422 .get_link_net = vxlan_get_link_net,
4425 struct net_device *vxlan_dev_create(struct net *net, const char *name,
4426 u8 name_assign_type,
4427 struct vxlan_config *conf)
4429 struct nlattr *tb[IFLA_MAX + 1];
4430 struct net_device *dev;
4433 memset(&tb, 0, sizeof(tb));
4435 dev = rtnl_create_link(net, name, name_assign_type,
4436 &vxlan_link_ops, tb, NULL);
4440 err = __vxlan_dev_create(net, dev, conf, NULL);
4443 return ERR_PTR(err);
4446 err = rtnl_configure_link(dev, NULL);
4448 LIST_HEAD(list_kill);
4450 vxlan_dellink(dev, &list_kill);
4451 unregister_netdevice_many(&list_kill);
4452 return ERR_PTR(err);
4457 EXPORT_SYMBOL_GPL(vxlan_dev_create);
4459 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4460 struct net_device *dev)
4462 struct vxlan_dev *vxlan, *next;
4463 LIST_HEAD(list_kill);
4465 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4466 struct vxlan_rdst *dst = &vxlan->default_dst;
4468 /* In case we created vxlan device with carrier
4469 * and we loose the carrier due to module unload
4470 * we also need to remove vxlan device. In other
4471 * cases, it's not necessary and remote_ifindex
4472 * is 0 here, so no matches.
4474 if (dst->remote_ifindex == dev->ifindex)
4475 vxlan_dellink(vxlan->dev, &list_kill);
4478 unregister_netdevice_many(&list_kill);
4481 static int vxlan_netdevice_event(struct notifier_block *unused,
4482 unsigned long event, void *ptr)
4484 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4485 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4487 if (event == NETDEV_UNREGISTER) {
4488 if (!dev->udp_tunnel_nic_info)
4489 vxlan_offload_rx_ports(dev, false);
4490 vxlan_handle_lowerdev_unregister(vn, dev);
4491 } else if (event == NETDEV_REGISTER) {
4492 if (!dev->udp_tunnel_nic_info)
4493 vxlan_offload_rx_ports(dev, true);
4494 } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
4495 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
4496 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
4502 static struct notifier_block vxlan_notifier_block __read_mostly = {
4503 .notifier_call = vxlan_netdevice_event,
4507 vxlan_fdb_offloaded_set(struct net_device *dev,
4508 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4510 struct vxlan_dev *vxlan = netdev_priv(dev);
4511 struct vxlan_rdst *rdst;
4512 struct vxlan_fdb *f;
4515 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4517 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4519 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4523 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4524 fdb_info->remote_port,
4525 fdb_info->remote_vni,
4526 fdb_info->remote_ifindex);
4530 rdst->offloaded = fdb_info->offloaded;
4533 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4537 vxlan_fdb_external_learn_add(struct net_device *dev,
4538 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4540 struct vxlan_dev *vxlan = netdev_priv(dev);
4541 struct netlink_ext_ack *extack;
4545 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4546 extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4548 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4549 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4551 NLM_F_CREATE | NLM_F_REPLACE,
4552 fdb_info->remote_port,
4554 fdb_info->remote_vni,
4555 fdb_info->remote_ifindex,
4556 NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4558 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4564 vxlan_fdb_external_learn_del(struct net_device *dev,
4565 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4567 struct vxlan_dev *vxlan = netdev_priv(dev);
4568 struct vxlan_fdb *f;
4572 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4573 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4575 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4578 else if (f->flags & NTF_EXT_LEARNED)
4579 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4580 fdb_info->remote_ip,
4581 fdb_info->remote_port,
4583 fdb_info->remote_vni,
4584 fdb_info->remote_ifindex,
4587 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4592 static int vxlan_switchdev_event(struct notifier_block *unused,
4593 unsigned long event, void *ptr)
4595 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4596 struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4600 case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4601 vxlan_fdb_offloaded_set(dev, ptr);
4603 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4605 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4607 err = notifier_from_errno(err);
4610 fdb_info->offloaded = true;
4611 vxlan_fdb_offloaded_set(dev, fdb_info);
4613 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4615 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4617 err = notifier_from_errno(err);
4620 fdb_info->offloaded = false;
4621 vxlan_fdb_offloaded_set(dev, fdb_info);
4628 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4629 .notifier_call = vxlan_switchdev_event,
4632 static void vxlan_fdb_nh_flush(struct nexthop *nh)
4634 struct vxlan_fdb *fdb;
4635 struct vxlan_dev *vxlan;
4639 list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
4640 vxlan = rcu_dereference(fdb->vdev);
4642 hash_index = fdb_head_index(vxlan, fdb->eth_addr,
4643 vxlan->default_dst.remote_vni);
4644 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4645 if (!hlist_unhashed(&fdb->hlist))
4646 vxlan_fdb_destroy(vxlan, fdb, false, false);
4647 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4652 static int vxlan_nexthop_event(struct notifier_block *nb,
4653 unsigned long event, void *ptr)
4655 struct nexthop *nh = ptr;
4657 if (!nh || event != NEXTHOP_EVENT_DEL)
4660 vxlan_fdb_nh_flush(nh);
4665 static struct notifier_block vxlan_nexthop_notifier_block __read_mostly = {
4666 .notifier_call = vxlan_nexthop_event,
4669 static __net_init int vxlan_init_net(struct net *net)
4671 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4674 INIT_LIST_HEAD(&vn->vxlan_list);
4675 spin_lock_init(&vn->sock_lock);
4677 for (h = 0; h < PORT_HASH_SIZE; ++h)
4678 INIT_HLIST_HEAD(&vn->sock_list[h]);
4680 return register_nexthop_notifier(net, &vxlan_nexthop_notifier_block);
4683 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
4685 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4686 struct vxlan_dev *vxlan, *next;
4687 struct net_device *dev, *aux;
4690 for_each_netdev_safe(net, dev, aux)
4691 if (dev->rtnl_link_ops == &vxlan_link_ops)
4692 unregister_netdevice_queue(dev, head);
4694 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4695 /* If vxlan->dev is in the same netns, it has already been added
4696 * to the list by the previous loop.
4698 if (!net_eq(dev_net(vxlan->dev), net))
4699 unregister_netdevice_queue(vxlan->dev, head);
4702 for (h = 0; h < PORT_HASH_SIZE; ++h)
4703 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4706 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
4712 list_for_each_entry(net, net_list, exit_list)
4713 unregister_nexthop_notifier(net, &vxlan_nexthop_notifier_block);
4714 list_for_each_entry(net, net_list, exit_list)
4715 vxlan_destroy_tunnels(net, &list);
4717 unregister_netdevice_many(&list);
4721 static struct pernet_operations vxlan_net_ops = {
4722 .init = vxlan_init_net,
4723 .exit_batch = vxlan_exit_batch_net,
4724 .id = &vxlan_net_id,
4725 .size = sizeof(struct vxlan_net),
4728 static int __init vxlan_init_module(void)
4732 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4734 rc = register_pernet_subsys(&vxlan_net_ops);
4738 rc = register_netdevice_notifier(&vxlan_notifier_block);
4742 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4746 rc = rtnl_link_register(&vxlan_link_ops);
4752 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4754 unregister_netdevice_notifier(&vxlan_notifier_block);
4756 unregister_pernet_subsys(&vxlan_net_ops);
4760 late_initcall(vxlan_init_module);
4762 static void __exit vxlan_cleanup_module(void)
4764 rtnl_link_unregister(&vxlan_link_ops);
4765 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4766 unregister_netdevice_notifier(&vxlan_notifier_block);
4767 unregister_pernet_subsys(&vxlan_net_ops);
4768 /* rcu_barrier() is called by netns */
4770 module_exit(vxlan_cleanup_module);
4772 MODULE_LICENSE("GPL");
4773 MODULE_VERSION(VXLAN_VERSION);
4774 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
4775 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4776 MODULE_ALIAS_RTNL_LINK("vxlan");