2 * VXLAN: Virtual eXtensible Local Area Network
4 * Copyright (c) 2012-2013 Vyatta Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/module.h>
19 #include <linux/errno.h>
20 #include <linux/slab.h>
21 #include <linux/skbuff.h>
22 #include <linux/rculist.h>
23 #include <linux/netdevice.h>
26 #include <linux/udp.h>
27 #include <linux/igmp.h>
28 #include <linux/etherdevice.h>
29 #include <linux/if_ether.h>
30 #include <linux/hash.h>
31 #include <linux/ethtool.h>
33 #include <net/ndisc.h>
35 #include <net/ip_tunnels.h>
38 #include <net/rtnetlink.h>
39 #include <net/route.h>
40 #include <net/dsfield.h>
41 #include <net/inet_ecn.h>
42 #include <net/net_namespace.h>
43 #include <net/netns/generic.h>
45 #define VXLAN_VERSION "0.1"
47 #define PORT_HASH_BITS 8
48 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
49 #define VNI_HASH_BITS 10
50 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
51 #define FDB_HASH_BITS 8
52 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
53 #define FDB_AGE_DEFAULT 300 /* 5 min */
54 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
56 #define VXLAN_N_VID (1u << 24)
57 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
58 /* IP header + UDP + VXLAN + Ethernet header */
59 #define VXLAN_HEADROOM (20 + 8 + 8 + 14)
61 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
63 /* VXLAN protocol header */
69 /* UDP port for VXLAN traffic.
70 * The IANA assigned port is 4789, but the Linux default is 8472
71 * for compatability with early adopters.
73 static unsigned int vxlan_port __read_mostly = 8472;
74 module_param_named(udp_port, vxlan_port, uint, 0444);
75 MODULE_PARM_DESC(udp_port, "Destination UDP port");
77 static bool log_ecn_error = true;
78 module_param(log_ecn_error, bool, 0644);
79 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
81 static unsigned int vxlan_net_id;
83 /* per UDP socket information */
85 struct hlist_node hlist;
87 struct work_struct del_work;
90 struct hlist_head vni_list[VNI_HASH_SIZE];
93 /* per-network namespace private data for this module */
95 struct list_head vxlan_list;
96 struct hlist_head sock_list[PORT_HASH_SIZE];
105 struct list_head list;
108 /* Forwarding table entry */
110 struct hlist_node hlist; /* linked list of entries */
112 unsigned long updated; /* jiffies */
114 struct list_head remotes;
115 u16 state; /* see ndm_state */
116 u8 flags; /* see ndm_flags */
117 u8 eth_addr[ETH_ALEN];
120 /* Pseudo network device */
122 struct hlist_node hlist; /* vni hash table */
123 struct list_head next; /* vxlan's per namespace list */
124 struct vxlan_sock *vn_sock; /* listening socket */
125 struct net_device *dev;
126 struct vxlan_rdst default_dst; /* default destination */
127 __be32 saddr; /* source address */
129 __u16 port_min; /* source port range */
131 __u8 tos; /* TOS override */
133 u32 flags; /* VXLAN_F_* below */
135 struct work_struct sock_work;
136 struct work_struct igmp_work;
138 unsigned long age_interval;
139 struct timer_list age_timer;
140 spinlock_t hash_lock;
141 unsigned int addrcnt;
142 unsigned int addrmax;
144 struct hlist_head fdb_head[FDB_HASH_SIZE];
147 #define VXLAN_F_LEARN 0x01
148 #define VXLAN_F_PROXY 0x02
149 #define VXLAN_F_RSC 0x04
150 #define VXLAN_F_L2MISS 0x08
151 #define VXLAN_F_L3MISS 0x10
153 /* salt for hash table */
154 static u32 vxlan_salt __read_mostly;
155 static struct workqueue_struct *vxlan_wq;
157 static void vxlan_sock_work(struct work_struct *work);
159 /* Virtual Network hash table head */
160 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
162 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
165 /* Socket hash table head */
166 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
168 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
170 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
173 /* First remote destination for a forwarding entry.
174 * Guaranteed to be non-NULL because remotes are never deleted.
176 static inline struct vxlan_rdst *first_remote(struct vxlan_fdb *fdb)
178 return list_first_or_null_rcu(&fdb->remotes, struct vxlan_rdst, list);
181 /* Find VXLAN socket based on network namespace and UDP port */
182 static struct vxlan_sock *vxlan_find_port(struct net *net, __be16 port)
184 struct vxlan_sock *vs;
186 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
187 if (inet_sk(vs->sock->sk)->inet_sport == port)
193 /* Look up VNI in a per net namespace table */
194 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
196 struct vxlan_sock *vs;
197 struct vxlan_dev *vxlan;
199 vs = vxlan_find_port(net, port);
203 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
204 if (vxlan->default_dst.remote_vni == id)
211 /* Fill in neighbour message in skbuff. */
212 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
213 const struct vxlan_fdb *fdb,
214 u32 portid, u32 seq, int type, unsigned int flags,
215 const struct vxlan_rdst *rdst)
217 unsigned long now = jiffies;
218 struct nda_cacheinfo ci;
219 struct nlmsghdr *nlh;
221 bool send_ip, send_eth;
223 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
227 ndm = nlmsg_data(nlh);
228 memset(ndm, 0, sizeof(*ndm));
230 send_eth = send_ip = true;
232 if (type == RTM_GETNEIGH) {
233 ndm->ndm_family = AF_INET;
234 send_ip = rdst->remote_ip != htonl(INADDR_ANY);
235 send_eth = !is_zero_ether_addr(fdb->eth_addr);
237 ndm->ndm_family = AF_BRIDGE;
238 ndm->ndm_state = fdb->state;
239 ndm->ndm_ifindex = vxlan->dev->ifindex;
240 ndm->ndm_flags = fdb->flags;
241 ndm->ndm_type = NDA_DST;
243 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
244 goto nla_put_failure;
246 if (send_ip && nla_put_be32(skb, NDA_DST, rdst->remote_ip))
247 goto nla_put_failure;
249 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
250 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
251 goto nla_put_failure;
252 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
253 nla_put_be32(skb, NDA_VNI, rdst->remote_vni))
254 goto nla_put_failure;
255 if (rdst->remote_ifindex &&
256 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
257 goto nla_put_failure;
259 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
260 ci.ndm_confirmed = 0;
261 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
264 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
265 goto nla_put_failure;
267 return nlmsg_end(skb, nlh);
270 nlmsg_cancel(skb, nlh);
274 static inline size_t vxlan_nlmsg_size(void)
276 return NLMSG_ALIGN(sizeof(struct ndmsg))
277 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
278 + nla_total_size(sizeof(__be32)) /* NDA_DST */
279 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
280 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
281 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
282 + nla_total_size(sizeof(struct nda_cacheinfo));
285 static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
286 struct vxlan_fdb *fdb, int type)
288 struct net *net = dev_net(vxlan->dev);
292 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
296 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, first_remote(fdb));
298 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
299 WARN_ON(err == -EMSGSIZE);
304 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
308 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
311 static void vxlan_ip_miss(struct net_device *dev, __be32 ipa)
313 struct vxlan_dev *vxlan = netdev_priv(dev);
315 struct vxlan_rdst remote;
317 memset(&f, 0, sizeof f);
320 remote.remote_ip = ipa; /* goes to NDA_DST */
321 remote.remote_vni = VXLAN_N_VID;
323 INIT_LIST_HEAD(&f.remotes);
324 list_add_rcu(&remote.list, &f.remotes);
326 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
329 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
333 memset(&f, 0, sizeof f);
334 INIT_LIST_HEAD(&f.remotes);
336 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
338 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
341 /* Hash Ethernet address */
342 static u32 eth_hash(const unsigned char *addr)
344 u64 value = get_unaligned((u64 *)addr);
346 /* only want 6 bytes */
352 return hash_64(value, FDB_HASH_BITS);
355 /* Hash chain to use given mac address */
356 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
359 return &vxlan->fdb_head[eth_hash(mac)];
362 /* Look up Ethernet address in forwarding table */
363 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
367 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
370 hlist_for_each_entry_rcu(f, head, hlist) {
371 if (compare_ether_addr(mac, f->eth_addr) == 0)
378 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
383 f = __vxlan_find_mac(vxlan, mac);
390 /* Add/update destinations for multicast */
391 static int vxlan_fdb_append(struct vxlan_fdb *f,
392 __be32 ip, __be16 port, __u32 vni, __u32 ifindex)
394 struct vxlan_rdst *rd;
396 /* protected by vxlan->hash_lock */
397 list_for_each_entry(rd, &f->remotes, list) {
398 if (rd->remote_ip == ip &&
399 rd->remote_port == port &&
400 rd->remote_vni == vni &&
401 rd->remote_ifindex == ifindex)
405 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
409 rd->remote_port = port;
410 rd->remote_vni = vni;
411 rd->remote_ifindex = ifindex;
413 list_add_tail_rcu(&rd->list, &f->remotes);
418 /* Add new entry to forwarding table -- assumes lock held */
419 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
420 const u8 *mac, __be32 ip,
421 __u16 state, __u16 flags,
422 __be16 port, __u32 vni, __u32 ifindex,
428 f = __vxlan_find_mac(vxlan, mac);
430 if (flags & NLM_F_EXCL) {
431 netdev_dbg(vxlan->dev,
432 "lost race to create %pM\n", mac);
435 if (f->state != state) {
437 f->updated = jiffies;
440 if (f->flags != ndm_flags) {
441 f->flags = ndm_flags;
442 f->updated = jiffies;
445 if ((flags & NLM_F_APPEND) &&
446 is_multicast_ether_addr(f->eth_addr)) {
447 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex);
454 if (!(flags & NLM_F_CREATE))
457 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
460 netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip);
461 f = kmalloc(sizeof(*f), GFP_ATOMIC);
467 f->flags = ndm_flags;
468 f->updated = f->used = jiffies;
469 INIT_LIST_HEAD(&f->remotes);
470 memcpy(f->eth_addr, mac, ETH_ALEN);
472 vxlan_fdb_append(f, ip, port, vni, ifindex);
475 hlist_add_head_rcu(&f->hlist,
476 vxlan_fdb_head(vxlan, mac));
480 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
485 static void vxlan_fdb_free(struct rcu_head *head)
487 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
488 struct vxlan_rdst *rd, *nd;
490 list_for_each_entry_safe(rd, nd, &f->remotes, list)
495 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
497 netdev_dbg(vxlan->dev,
498 "delete %pM\n", f->eth_addr);
501 vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
503 hlist_del_rcu(&f->hlist);
504 call_rcu(&f->rcu, vxlan_fdb_free);
507 /* Add static entry (via netlink) */
508 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
509 struct net_device *dev,
510 const unsigned char *addr, u16 flags)
512 struct vxlan_dev *vxlan = netdev_priv(dev);
513 struct net *net = dev_net(vxlan->dev);
519 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
520 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
525 if (tb[NDA_DST] == NULL)
528 if (nla_len(tb[NDA_DST]) != sizeof(__be32))
529 return -EAFNOSUPPORT;
531 ip = nla_get_be32(tb[NDA_DST]);
534 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
536 port = nla_get_be16(tb[NDA_PORT]);
538 port = vxlan->dst_port;
541 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
543 vni = nla_get_u32(tb[NDA_VNI]);
545 vni = vxlan->default_dst.remote_vni;
547 if (tb[NDA_IFINDEX]) {
548 struct net_device *tdev;
550 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
552 ifindex = nla_get_u32(tb[NDA_IFINDEX]);
553 tdev = dev_get_by_index(net, ifindex);
555 return -EADDRNOTAVAIL;
560 spin_lock_bh(&vxlan->hash_lock);
561 err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags,
562 port, vni, ifindex, ndm->ndm_flags);
563 spin_unlock_bh(&vxlan->hash_lock);
568 /* Delete entry (via netlink) */
569 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
570 struct net_device *dev,
571 const unsigned char *addr)
573 struct vxlan_dev *vxlan = netdev_priv(dev);
577 spin_lock_bh(&vxlan->hash_lock);
578 f = vxlan_find_mac(vxlan, addr);
580 vxlan_fdb_destroy(vxlan, f);
583 spin_unlock_bh(&vxlan->hash_lock);
588 /* Dump forwarding table */
589 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
590 struct net_device *dev, int idx)
592 struct vxlan_dev *vxlan = netdev_priv(dev);
595 for (h = 0; h < FDB_HASH_SIZE; ++h) {
599 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
600 struct vxlan_rdst *rd;
602 if (idx < cb->args[0])
605 list_for_each_entry_rcu(rd, &f->remotes, list) {
606 err = vxlan_fdb_info(skb, vxlan, f,
607 NETLINK_CB(cb->skb).portid,
622 /* Watch incoming packets to learn mapping between Ethernet address
623 * and Tunnel endpoint.
624 * Return true if packet is bogus and should be droppped.
626 static bool vxlan_snoop(struct net_device *dev,
627 __be32 src_ip, const u8 *src_mac)
629 struct vxlan_dev *vxlan = netdev_priv(dev);
632 f = vxlan_find_mac(vxlan, src_mac);
634 struct vxlan_rdst *rdst = first_remote(f);
636 if (likely(rdst->remote_ip == src_ip))
639 /* Don't migrate static entries, drop packets */
640 if (f->state & NUD_NOARP)
645 "%pM migrated from %pI4 to %pI4\n",
646 src_mac, &rdst->remote_ip, &src_ip);
648 rdst->remote_ip = src_ip;
649 f->updated = jiffies;
650 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
652 /* learned new entry */
653 spin_lock(&vxlan->hash_lock);
655 /* close off race between vxlan_flush and incoming packets */
656 if (netif_running(dev))
657 vxlan_fdb_create(vxlan, src_mac, src_ip,
659 NLM_F_EXCL|NLM_F_CREATE,
661 vxlan->default_dst.remote_vni,
663 spin_unlock(&vxlan->hash_lock);
670 /* See if multicast group is already in use by other ID */
671 static bool vxlan_group_used(struct vxlan_net *vn, __be32 remote_ip)
673 struct vxlan_dev *vxlan;
675 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
676 if (!netif_running(vxlan->dev))
679 if (vxlan->default_dst.remote_ip == remote_ip)
686 static void vxlan_sock_hold(struct vxlan_sock *vs)
688 atomic_inc(&vs->refcnt);
691 static void vxlan_sock_release(struct vxlan_net *vn, struct vxlan_sock *vs)
693 if (!atomic_dec_and_test(&vs->refcnt))
696 spin_lock(&vn->sock_lock);
697 hlist_del_rcu(&vs->hlist);
698 spin_unlock(&vn->sock_lock);
700 queue_work(vxlan_wq, &vs->del_work);
703 /* Callback to update multicast group membership.
704 * Scheduled when vxlan goes up/down.
706 static void vxlan_igmp_work(struct work_struct *work)
708 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_work);
709 struct vxlan_net *vn = net_generic(dev_net(vxlan->dev), vxlan_net_id);
710 struct vxlan_sock *vs = vxlan->vn_sock;
711 struct sock *sk = vs->sock->sk;
712 struct ip_mreqn mreq = {
713 .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip,
714 .imr_ifindex = vxlan->default_dst.remote_ifindex,
718 if (vxlan_group_used(vn, vxlan->default_dst.remote_ip))
719 ip_mc_join_group(sk, &mreq);
721 ip_mc_leave_group(sk, &mreq);
724 vxlan_sock_release(vn, vs);
728 /* Callback from net/ipv4/udp.c to receive packets */
729 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
732 struct vxlanhdr *vxh;
733 struct vxlan_dev *vxlan;
734 struct pcpu_tstats *stats;
739 /* pop off outer UDP header */
740 __skb_pull(skb, sizeof(struct udphdr));
742 /* Need Vxlan and inner Ethernet header to be present */
743 if (!pskb_may_pull(skb, sizeof(struct vxlanhdr)))
746 /* Drop packets with reserved bits set */
747 vxh = (struct vxlanhdr *) skb->data;
748 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
749 (vxh->vx_vni & htonl(0xff))) {
750 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
751 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
755 __skb_pull(skb, sizeof(struct vxlanhdr));
757 /* Is this VNI defined? */
758 vni = ntohl(vxh->vx_vni) >> 8;
759 port = inet_sk(sk)->inet_sport;
760 vxlan = vxlan_find_vni(sock_net(sk), vni, port);
762 netdev_dbg(skb->dev, "unknown vni %d port %u\n",
767 if (!pskb_may_pull(skb, ETH_HLEN)) {
768 vxlan->dev->stats.rx_length_errors++;
769 vxlan->dev->stats.rx_errors++;
773 skb_reset_mac_header(skb);
775 /* Re-examine inner Ethernet packet */
777 skb->protocol = eth_type_trans(skb, vxlan->dev);
779 /* Ignore packet loops (and multicast echo) */
780 if (compare_ether_addr(eth_hdr(skb)->h_source,
781 vxlan->dev->dev_addr) == 0)
784 if ((vxlan->flags & VXLAN_F_LEARN) &&
785 vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source))
788 __skb_tunnel_rx(skb, vxlan->dev);
789 skb_reset_network_header(skb);
791 /* If the NIC driver gave us an encapsulated packet with
792 * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled,
793 * leave the CHECKSUM_UNNECESSARY, the device checksummed it
794 * for us. Otherwise force the upper layers to verify it.
796 if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation ||
797 !(vxlan->dev->features & NETIF_F_RXCSUM))
798 skb->ip_summed = CHECKSUM_NONE;
800 skb->encapsulation = 0;
802 err = IP_ECN_decapsulate(oip, skb);
805 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
806 &oip->saddr, oip->tos);
808 ++vxlan->dev->stats.rx_frame_errors;
809 ++vxlan->dev->stats.rx_errors;
814 stats = this_cpu_ptr(vxlan->dev->tstats);
815 u64_stats_update_begin(&stats->syncp);
817 stats->rx_bytes += skb->len;
818 u64_stats_update_end(&stats->syncp);
824 /* Put UDP header back */
825 __skb_push(skb, sizeof(struct udphdr));
829 /* Consume bad packet */
834 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
836 struct vxlan_dev *vxlan = netdev_priv(dev);
842 if (dev->flags & IFF_NOARP)
845 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
846 dev->stats.tx_dropped++;
851 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
852 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
853 parp->ar_pro != htons(ETH_P_IP) ||
854 parp->ar_op != htons(ARPOP_REQUEST) ||
855 parp->ar_hln != dev->addr_len ||
858 arpptr = (u8 *)parp + sizeof(struct arphdr);
860 arpptr += dev->addr_len; /* sha */
861 memcpy(&sip, arpptr, sizeof(sip));
862 arpptr += sizeof(sip);
863 arpptr += dev->addr_len; /* tha */
864 memcpy(&tip, arpptr, sizeof(tip));
866 if (ipv4_is_loopback(tip) ||
867 ipv4_is_multicast(tip))
870 n = neigh_lookup(&arp_tbl, &tip, dev);
874 struct sk_buff *reply;
876 if (!(n->nud_state & NUD_CONNECTED)) {
881 f = vxlan_find_mac(vxlan, n->ha);
882 if (f && first_remote(f)->remote_ip == htonl(INADDR_ANY)) {
883 /* bridge-local neighbor */
888 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
893 skb_reset_mac_header(reply);
894 __skb_pull(reply, skb_network_offset(reply));
895 reply->ip_summed = CHECKSUM_UNNECESSARY;
896 reply->pkt_type = PACKET_HOST;
898 if (netif_rx_ni(reply) == NET_RX_DROP)
899 dev->stats.rx_dropped++;
900 } else if (vxlan->flags & VXLAN_F_L3MISS)
901 vxlan_ip_miss(dev, tip);
907 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
909 struct vxlan_dev *vxlan = netdev_priv(dev);
913 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
917 switch (ntohs(eth_hdr(skb)->h_proto)) {
919 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
922 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
931 diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0;
933 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
935 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
939 } else if (vxlan->flags & VXLAN_F_L3MISS)
940 vxlan_ip_miss(dev, pip->daddr);
944 static void vxlan_sock_put(struct sk_buff *skb)
949 /* On transmit, associate with the tunnel socket */
950 static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb)
952 struct vxlan_dev *vxlan = netdev_priv(dev);
953 struct sock *sk = vxlan->vn_sock->sock->sk;
958 skb->destructor = vxlan_sock_put;
961 /* Compute source port for outgoing packet
962 * first choice to use L4 flow hash since it will spread
963 * better and maybe available from hardware
964 * secondary choice is to use jhash on the Ethernet header
966 static __be16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb)
968 unsigned int range = (vxlan->port_max - vxlan->port_min) + 1;
971 hash = skb_get_rxhash(skb);
973 hash = jhash(skb->data, 2 * ETH_ALEN,
974 (__force u32) skb->protocol);
976 return htons((((u64) hash * range) >> 32) + vxlan->port_min);
979 static int handle_offloads(struct sk_buff *skb)
981 if (skb_is_gso(skb)) {
982 int err = skb_unclone(skb, GFP_ATOMIC);
986 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
987 } else if (skb->ip_summed != CHECKSUM_PARTIAL)
988 skb->ip_summed = CHECKSUM_NONE;
993 /* Bypass encapsulation if the destination is local */
994 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
995 struct vxlan_dev *dst_vxlan)
997 struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
998 struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1000 skb->pkt_type = PACKET_HOST;
1001 skb->encapsulation = 0;
1002 skb->dev = dst_vxlan->dev;
1003 __skb_pull(skb, skb_network_offset(skb));
1005 if (dst_vxlan->flags & VXLAN_F_LEARN)
1006 vxlan_snoop(skb->dev, htonl(INADDR_LOOPBACK),
1007 eth_hdr(skb)->h_source);
1009 u64_stats_update_begin(&tx_stats->syncp);
1010 tx_stats->tx_packets++;
1011 tx_stats->tx_bytes += skb->len;
1012 u64_stats_update_end(&tx_stats->syncp);
1014 if (netif_rx(skb) == NET_RX_SUCCESS) {
1015 u64_stats_update_begin(&rx_stats->syncp);
1016 rx_stats->rx_packets++;
1017 rx_stats->rx_bytes += skb->len;
1018 u64_stats_update_end(&rx_stats->syncp);
1020 skb->dev->stats.rx_dropped++;
1024 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1025 struct vxlan_rdst *rdst, bool did_rsc)
1027 struct vxlan_dev *vxlan = netdev_priv(dev);
1029 const struct iphdr *old_iph;
1030 struct vxlanhdr *vxh;
1034 __be16 src_port, dst_port;
1040 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1041 vni = rdst->remote_vni;
1042 dst = rdst->remote_ip;
1046 /* short-circuited back to local bridge */
1047 vxlan_encap_bypass(skb, vxlan, vxlan);
1053 if (!skb->encapsulation) {
1054 skb_reset_inner_headers(skb);
1055 skb->encapsulation = 1;
1058 /* Need space for new headers (invalidates iph ptr) */
1059 if (skb_cow_head(skb, VXLAN_HEADROOM))
1062 old_iph = ip_hdr(skb);
1065 if (!ttl && IN_MULTICAST(ntohl(dst)))
1070 tos = ip_tunnel_get_dsfield(old_iph, skb);
1072 src_port = vxlan_src_port(vxlan, skb);
1074 memset(&fl4, 0, sizeof(fl4));
1075 fl4.flowi4_oif = rdst->remote_ifindex;
1076 fl4.flowi4_tos = RT_TOS(tos);
1078 fl4.saddr = vxlan->saddr;
1080 rt = ip_route_output_key(dev_net(dev), &fl4);
1082 netdev_dbg(dev, "no route to %pI4\n", &dst);
1083 dev->stats.tx_carrier_errors++;
1087 if (rt->dst.dev == dev) {
1088 netdev_dbg(dev, "circular route to %pI4\n", &dst);
1090 dev->stats.collisions++;
1094 /* Bypass encapsulation if the destination is local */
1095 if (rt->rt_flags & RTCF_LOCAL &&
1096 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1097 struct vxlan_dev *dst_vxlan;
1100 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1103 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1106 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1107 vxh->vx_flags = htonl(VXLAN_FLAGS);
1108 vxh->vx_vni = htonl(vni << 8);
1110 __skb_push(skb, sizeof(*uh));
1111 skb_reset_transport_header(skb);
1114 uh->dest = dst_port;
1115 uh->source = src_port;
1117 uh->len = htons(skb->len);
1120 vxlan_set_owner(dev, skb);
1122 if (handle_offloads(skb))
1125 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1126 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1128 err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, dst,
1129 IPPROTO_UDP, tos, ttl, df);
1130 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1135 dev->stats.tx_dropped++;
1139 dev->stats.tx_errors++;
1144 /* Transmit local packets over Vxlan
1146 * Outer IP header inherits ECN and DF from inner header.
1147 * Outer UDP destination is the VXLAN assigned port.
1148 * source port is based on hash of flow
1150 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1152 struct vxlan_dev *vxlan = netdev_priv(dev);
1154 bool did_rsc = false;
1155 struct vxlan_rdst *rdst0, *rdst;
1156 struct vxlan_fdb *f;
1158 skb_reset_mac_header(skb);
1161 if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP)
1162 return arp_reduce(dev, skb);
1164 f = vxlan_find_mac(vxlan, eth->h_dest);
1167 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1168 ntohs(eth->h_proto) == ETH_P_IP) {
1169 did_rsc = route_shortcircuit(dev, skb);
1171 f = vxlan_find_mac(vxlan, eth->h_dest);
1175 rdst0 = &vxlan->default_dst;
1177 if (rdst0->remote_ip == htonl(INADDR_ANY) &&
1178 (vxlan->flags & VXLAN_F_L2MISS) &&
1179 !is_multicast_ether_addr(eth->h_dest))
1180 vxlan_fdb_miss(vxlan, eth->h_dest);
1182 rdst = rdst0 = first_remote(f);
1184 /* if there are multiple destinations, send copies */
1185 list_for_each_entry_continue_rcu(rdst, &f->remotes, list) {
1186 struct sk_buff *skb1;
1188 skb1 = skb_clone(skb, GFP_ATOMIC);
1190 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1194 vxlan_xmit_one(skb, dev, rdst0, did_rsc);
1195 return NETDEV_TX_OK;
1198 /* Walk the forwarding table and purge stale entries */
1199 static void vxlan_cleanup(unsigned long arg)
1201 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1202 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1205 if (!netif_running(vxlan->dev))
1208 spin_lock_bh(&vxlan->hash_lock);
1209 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1210 struct hlist_node *p, *n;
1211 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1213 = container_of(p, struct vxlan_fdb, hlist);
1214 unsigned long timeout;
1216 if (f->state & NUD_PERMANENT)
1219 timeout = f->used + vxlan->age_interval * HZ;
1220 if (time_before_eq(timeout, jiffies)) {
1221 netdev_dbg(vxlan->dev,
1222 "garbage collect %pM\n",
1224 f->state = NUD_STALE;
1225 vxlan_fdb_destroy(vxlan, f);
1226 } else if (time_before(timeout, next_timer))
1227 next_timer = timeout;
1230 spin_unlock_bh(&vxlan->hash_lock);
1232 mod_timer(&vxlan->age_timer, next_timer);
1235 /* Setup stats when device is created */
1236 static int vxlan_init(struct net_device *dev)
1238 struct vxlan_dev *vxlan = netdev_priv(dev);
1239 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1240 struct vxlan_sock *vs;
1241 __u32 vni = vxlan->default_dst.remote_vni;
1243 dev->tstats = alloc_percpu(struct pcpu_tstats);
1247 spin_lock(&vn->sock_lock);
1248 vs = vxlan_find_port(dev_net(dev), vxlan->dst_port);
1250 /* If we have a socket with same port already, reuse it */
1251 atomic_inc(&vs->refcnt);
1252 vxlan->vn_sock = vs;
1253 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1255 /* otherwise make new socket outside of RTNL */
1257 queue_work(vxlan_wq, &vxlan->sock_work);
1259 spin_unlock(&vn->sock_lock);
1264 static void vxlan_uninit(struct net_device *dev)
1266 struct vxlan_dev *vxlan = netdev_priv(dev);
1267 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1268 struct vxlan_sock *vs = vxlan->vn_sock;
1271 vxlan_sock_release(vn, vs);
1272 free_percpu(dev->tstats);
1275 /* Start ageing timer and join group when device is brought up */
1276 static int vxlan_open(struct net_device *dev)
1278 struct vxlan_dev *vxlan = netdev_priv(dev);
1279 struct vxlan_sock *vs = vxlan->vn_sock;
1281 /* socket hasn't been created */
1285 if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) {
1286 vxlan_sock_hold(vs);
1288 queue_work(vxlan_wq, &vxlan->igmp_work);
1291 if (vxlan->age_interval)
1292 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
1297 /* Purge the forwarding table */
1298 static void vxlan_flush(struct vxlan_dev *vxlan)
1302 spin_lock_bh(&vxlan->hash_lock);
1303 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1304 struct hlist_node *p, *n;
1305 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1307 = container_of(p, struct vxlan_fdb, hlist);
1308 vxlan_fdb_destroy(vxlan, f);
1311 spin_unlock_bh(&vxlan->hash_lock);
1314 /* Cleanup timer and forwarding table on shutdown */
1315 static int vxlan_stop(struct net_device *dev)
1317 struct vxlan_dev *vxlan = netdev_priv(dev);
1318 struct vxlan_sock *vs = vxlan->vn_sock;
1320 if (vs && IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) {
1321 vxlan_sock_hold(vs);
1323 queue_work(vxlan_wq, &vxlan->igmp_work);
1326 del_timer_sync(&vxlan->age_timer);
1333 /* Stub, nothing needs to be done. */
1334 static void vxlan_set_multicast_list(struct net_device *dev)
1338 static const struct net_device_ops vxlan_netdev_ops = {
1339 .ndo_init = vxlan_init,
1340 .ndo_uninit = vxlan_uninit,
1341 .ndo_open = vxlan_open,
1342 .ndo_stop = vxlan_stop,
1343 .ndo_start_xmit = vxlan_xmit,
1344 .ndo_get_stats64 = ip_tunnel_get_stats64,
1345 .ndo_set_rx_mode = vxlan_set_multicast_list,
1346 .ndo_change_mtu = eth_change_mtu,
1347 .ndo_validate_addr = eth_validate_addr,
1348 .ndo_set_mac_address = eth_mac_addr,
1349 .ndo_fdb_add = vxlan_fdb_add,
1350 .ndo_fdb_del = vxlan_fdb_delete,
1351 .ndo_fdb_dump = vxlan_fdb_dump,
1354 /* Info for udev, that this is a virtual tunnel endpoint */
1355 static struct device_type vxlan_type = {
1359 /* Initialize the device structure. */
1360 static void vxlan_setup(struct net_device *dev)
1362 struct vxlan_dev *vxlan = netdev_priv(dev);
1366 eth_hw_addr_random(dev);
1368 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
1370 dev->netdev_ops = &vxlan_netdev_ops;
1371 dev->destructor = free_netdev;
1372 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
1374 dev->tx_queue_len = 0;
1375 dev->features |= NETIF_F_LLTX;
1376 dev->features |= NETIF_F_NETNS_LOCAL;
1377 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1378 dev->features |= NETIF_F_RXCSUM;
1379 dev->features |= NETIF_F_GSO_SOFTWARE;
1381 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1382 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1383 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1384 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1386 INIT_LIST_HEAD(&vxlan->next);
1387 spin_lock_init(&vxlan->hash_lock);
1388 INIT_WORK(&vxlan->igmp_work, vxlan_igmp_work);
1389 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
1391 init_timer_deferrable(&vxlan->age_timer);
1392 vxlan->age_timer.function = vxlan_cleanup;
1393 vxlan->age_timer.data = (unsigned long) vxlan;
1395 inet_get_local_port_range(&low, &high);
1396 vxlan->port_min = low;
1397 vxlan->port_max = high;
1398 vxlan->dst_port = htons(vxlan_port);
1402 for (h = 0; h < FDB_HASH_SIZE; ++h)
1403 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
1406 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
1407 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
1408 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1409 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
1410 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
1411 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
1412 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
1413 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
1414 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
1415 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
1416 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
1417 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
1418 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
1419 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
1420 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
1421 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
1424 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
1426 if (tb[IFLA_ADDRESS]) {
1427 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1428 pr_debug("invalid link address (not ethernet)\n");
1432 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1433 pr_debug("invalid all zero ethernet address\n");
1434 return -EADDRNOTAVAIL;
1441 if (data[IFLA_VXLAN_ID]) {
1442 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
1443 if (id >= VXLAN_VID_MASK)
1447 if (data[IFLA_VXLAN_PORT_RANGE]) {
1448 const struct ifla_vxlan_port_range *p
1449 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1451 if (ntohs(p->high) < ntohs(p->low)) {
1452 pr_debug("port range %u .. %u not valid\n",
1453 ntohs(p->low), ntohs(p->high));
1461 static void vxlan_get_drvinfo(struct net_device *netdev,
1462 struct ethtool_drvinfo *drvinfo)
1464 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
1465 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
1468 static const struct ethtool_ops vxlan_ethtool_ops = {
1469 .get_drvinfo = vxlan_get_drvinfo,
1470 .get_link = ethtool_op_get_link,
1473 static void vxlan_del_work(struct work_struct *work)
1475 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
1477 sk_release_kernel(vs->sock->sk);
1481 static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port)
1483 struct vxlan_sock *vs;
1485 struct sockaddr_in vxlan_addr = {
1486 .sin_family = AF_INET,
1487 .sin_addr.s_addr = htonl(INADDR_ANY),
1492 vs = kmalloc(sizeof(*vs), GFP_KERNEL);
1494 return ERR_PTR(-ENOMEM);
1496 for (h = 0; h < VNI_HASH_SIZE; ++h)
1497 INIT_HLIST_HEAD(&vs->vni_list[h]);
1499 INIT_WORK(&vs->del_work, vxlan_del_work);
1501 /* Create UDP socket for encapsulation receive. */
1502 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vs->sock);
1504 pr_debug("UDP socket create failed\n");
1509 /* Put in proper namespace */
1511 sk_change_net(sk, net);
1513 vxlan_addr.sin_port = port;
1515 rc = kernel_bind(vs->sock, (struct sockaddr *) &vxlan_addr,
1516 sizeof(vxlan_addr));
1518 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
1519 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
1520 sk_release_kernel(sk);
1525 /* Disable multicast loopback */
1526 inet_sk(sk)->mc_loop = 0;
1528 /* Mark socket as an encapsulation socket. */
1529 udp_sk(sk)->encap_type = 1;
1530 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
1532 atomic_set(&vs->refcnt, 1);
1537 /* Scheduled at device creation to bind to a socket */
1538 static void vxlan_sock_work(struct work_struct *work)
1540 struct vxlan_dev *vxlan
1541 = container_of(work, struct vxlan_dev, sock_work);
1542 struct net_device *dev = vxlan->dev;
1543 struct net *net = dev_net(dev);
1544 __u32 vni = vxlan->default_dst.remote_vni;
1545 __be16 port = vxlan->dst_port;
1546 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1547 struct vxlan_sock *nvs, *ovs;
1549 nvs = vxlan_socket_create(net, port);
1551 netdev_err(vxlan->dev, "Can not create UDP socket, %ld\n",
1556 spin_lock(&vn->sock_lock);
1557 /* Look again to see if can reuse socket */
1558 ovs = vxlan_find_port(net, port);
1560 atomic_inc(&ovs->refcnt);
1561 vxlan->vn_sock = ovs;
1562 hlist_add_head_rcu(&vxlan->hlist, vni_head(ovs, vni));
1563 spin_unlock(&vn->sock_lock);
1565 sk_release_kernel(nvs->sock->sk);
1568 vxlan->vn_sock = nvs;
1569 hlist_add_head_rcu(&nvs->hlist, vs_head(net, port));
1570 hlist_add_head_rcu(&vxlan->hlist, vni_head(nvs, vni));
1571 spin_unlock(&vn->sock_lock);
1577 static int vxlan_newlink(struct net *net, struct net_device *dev,
1578 struct nlattr *tb[], struct nlattr *data[])
1580 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1581 struct vxlan_dev *vxlan = netdev_priv(dev);
1582 struct vxlan_rdst *dst = &vxlan->default_dst;
1586 if (!data[IFLA_VXLAN_ID])
1589 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
1590 dst->remote_vni = vni;
1592 if (data[IFLA_VXLAN_GROUP])
1593 dst->remote_ip = nla_get_be32(data[IFLA_VXLAN_GROUP]);
1595 if (data[IFLA_VXLAN_LOCAL])
1596 vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
1598 if (data[IFLA_VXLAN_LINK] &&
1599 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
1600 struct net_device *lowerdev
1601 = __dev_get_by_index(net, dst->remote_ifindex);
1604 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
1609 dev->mtu = lowerdev->mtu - VXLAN_HEADROOM;
1611 /* update header length based on lower device */
1612 dev->hard_header_len = lowerdev->hard_header_len +
1616 if (data[IFLA_VXLAN_TOS])
1617 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
1619 if (data[IFLA_VXLAN_TTL])
1620 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
1622 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
1623 vxlan->flags |= VXLAN_F_LEARN;
1625 if (data[IFLA_VXLAN_AGEING])
1626 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
1628 vxlan->age_interval = FDB_AGE_DEFAULT;
1630 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
1631 vxlan->flags |= VXLAN_F_PROXY;
1633 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
1634 vxlan->flags |= VXLAN_F_RSC;
1636 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
1637 vxlan->flags |= VXLAN_F_L2MISS;
1639 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
1640 vxlan->flags |= VXLAN_F_L3MISS;
1642 if (data[IFLA_VXLAN_LIMIT])
1643 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
1645 if (data[IFLA_VXLAN_PORT_RANGE]) {
1646 const struct ifla_vxlan_port_range *p
1647 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1648 vxlan->port_min = ntohs(p->low);
1649 vxlan->port_max = ntohs(p->high);
1652 if (data[IFLA_VXLAN_PORT])
1653 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
1655 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
1656 pr_info("duplicate VNI %u\n", vni);
1660 SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
1662 err = register_netdevice(dev);
1666 list_add(&vxlan->next, &vn->vxlan_list);
1671 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
1673 struct vxlan_dev *vxlan = netdev_priv(dev);
1675 hlist_del_rcu(&vxlan->hlist);
1676 list_del(&vxlan->next);
1677 unregister_netdevice_queue(dev, head);
1680 static size_t vxlan_get_size(const struct net_device *dev)
1683 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
1684 nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */
1685 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
1686 nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */
1687 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
1688 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
1689 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
1690 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
1691 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
1692 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
1693 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
1694 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
1695 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
1696 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
1697 nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
1701 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
1703 const struct vxlan_dev *vxlan = netdev_priv(dev);
1704 const struct vxlan_rdst *dst = &vxlan->default_dst;
1705 struct ifla_vxlan_port_range ports = {
1706 .low = htons(vxlan->port_min),
1707 .high = htons(vxlan->port_max),
1710 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
1711 goto nla_put_failure;
1713 if (dst->remote_ip && nla_put_be32(skb, IFLA_VXLAN_GROUP, dst->remote_ip))
1714 goto nla_put_failure;
1716 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
1717 goto nla_put_failure;
1719 if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr))
1720 goto nla_put_failure;
1722 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
1723 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
1724 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
1725 !!(vxlan->flags & VXLAN_F_LEARN)) ||
1726 nla_put_u8(skb, IFLA_VXLAN_PROXY,
1727 !!(vxlan->flags & VXLAN_F_PROXY)) ||
1728 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
1729 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
1730 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
1731 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
1732 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
1733 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
1734 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
1735 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
1736 goto nla_put_failure;
1738 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
1739 goto nla_put_failure;
1747 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
1749 .maxtype = IFLA_VXLAN_MAX,
1750 .policy = vxlan_policy,
1751 .priv_size = sizeof(struct vxlan_dev),
1752 .setup = vxlan_setup,
1753 .validate = vxlan_validate,
1754 .newlink = vxlan_newlink,
1755 .dellink = vxlan_dellink,
1756 .get_size = vxlan_get_size,
1757 .fill_info = vxlan_fill_info,
1760 static __net_init int vxlan_init_net(struct net *net)
1762 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1765 INIT_LIST_HEAD(&vn->vxlan_list);
1766 spin_lock_init(&vn->sock_lock);
1768 for (h = 0; h < PORT_HASH_SIZE; ++h)
1769 INIT_HLIST_HEAD(&vn->sock_list[h]);
1774 static __net_exit void vxlan_exit_net(struct net *net)
1776 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1777 struct vxlan_dev *vxlan;
1780 list_for_each_entry(vxlan, &vn->vxlan_list, next)
1781 dev_close(vxlan->dev);
1785 static struct pernet_operations vxlan_net_ops = {
1786 .init = vxlan_init_net,
1787 .exit = vxlan_exit_net,
1788 .id = &vxlan_net_id,
1789 .size = sizeof(struct vxlan_net),
1792 static int __init vxlan_init_module(void)
1796 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
1800 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
1802 rc = register_pernet_device(&vxlan_net_ops);
1806 rc = rtnl_link_register(&vxlan_link_ops);
1813 unregister_pernet_device(&vxlan_net_ops);
1815 destroy_workqueue(vxlan_wq);
1818 late_initcall(vxlan_init_module);
1820 static void __exit vxlan_cleanup_module(void)
1822 unregister_pernet_device(&vxlan_net_ops);
1823 rtnl_link_unregister(&vxlan_link_ops);
1824 destroy_workqueue(vxlan_wq);
1827 module_exit(vxlan_cleanup_module);
1829 MODULE_LICENSE("GPL");
1830 MODULE_VERSION(VXLAN_VERSION);
1831 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
1832 MODULE_ALIAS_RTNL_LINK("vxlan");