2 * VXLAN: Virtual eXtensiable Local Area Network
4 * Copyright (c) 2012 Vyatta Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 * - use IANA UDP port number (when defined)
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/module.h>
20 #include <linux/errno.h>
21 #include <linux/slab.h>
22 #include <linux/skbuff.h>
23 #include <linux/rculist.h>
24 #include <linux/netdevice.h>
27 #include <linux/udp.h>
28 #include <linux/igmp.h>
29 #include <linux/etherdevice.h>
30 #include <linux/if_ether.h>
31 #include <linux/version.h>
32 #include <linux/hash.h>
36 #include <net/rtnetlink.h>
37 #include <net/route.h>
38 #include <net/dsfield.h>
39 #include <net/inet_ecn.h>
40 #include <net/net_namespace.h>
41 #include <net/netns/generic.h>
43 #define VXLAN_VERSION "0.1"
45 #define VNI_HASH_BITS 10
46 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
47 #define FDB_HASH_BITS 8
48 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
49 #define FDB_AGE_DEFAULT 300 /* 5 min */
50 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
52 #define VXLAN_N_VID (1u << 24)
53 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
54 /* VLAN + IP header + UDP + VXLAN */
55 #define VXLAN_HEADROOM (4 + 20 + 8 + 8)
57 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
59 /* VXLAN protocol header */
65 /* UDP port for VXLAN traffic. */
66 static unsigned int vxlan_port __read_mostly
= 8472;
67 module_param_named(udp_port
, vxlan_port
, uint
, 0444);
68 MODULE_PARM_DESC(udp_port
, "Destination UDP port");
70 static bool log_ecn_error
= true;
71 module_param(log_ecn_error
, bool, 0644);
72 MODULE_PARM_DESC(log_ecn_error
, "Log packets received with corrupted ECN");
74 /* per-net private data for this module */
75 static unsigned int vxlan_net_id
;
77 struct socket
*sock
; /* UDP encap socket */
78 struct hlist_head vni_list
[VNI_HASH_SIZE
];
81 /* Forwarding table entry */
83 struct hlist_node hlist
; /* linked list of entries */
85 unsigned long updated
; /* jiffies */
88 u16 state
; /* see ndm_state */
89 u8 eth_addr
[ETH_ALEN
];
92 /* Per-cpu network traffic stats */
98 struct u64_stats_sync syncp
;
101 /* Pseudo network device */
103 struct hlist_node hlist
;
104 struct net_device
*dev
;
105 struct vxlan_stats __percpu
*stats
;
106 __u32 vni
; /* virtual network id */
107 __be32 gaddr
; /* multicast group */
108 __be32 saddr
; /* source address */
109 unsigned int link
; /* link to multicast over */
110 __u8 tos
; /* TOS override */
114 unsigned long age_interval
;
115 struct timer_list age_timer
;
116 spinlock_t hash_lock
;
117 unsigned int addrcnt
;
118 unsigned int addrmax
;
119 unsigned int addrexceeded
;
121 struct hlist_head fdb_head
[FDB_HASH_SIZE
];
124 /* salt for hash table */
125 static u32 vxlan_salt __read_mostly
;
127 static inline struct hlist_head
*vni_head(struct net
*net
, u32 id
)
129 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
131 return &vn
->vni_list
[hash_32(id
, VNI_HASH_BITS
)];
134 /* Look up VNI in a per net namespace table */
135 static struct vxlan_dev
*vxlan_find_vni(struct net
*net
, u32 id
)
137 struct vxlan_dev
*vxlan
;
138 struct hlist_node
*node
;
140 hlist_for_each_entry_rcu(vxlan
, node
, vni_head(net
, id
), hlist
) {
141 if (vxlan
->vni
== id
)
148 /* Fill in neighbour message in skbuff. */
149 static int vxlan_fdb_info(struct sk_buff
*skb
, struct vxlan_dev
*vxlan
,
150 const struct vxlan_fdb
*fdb
,
151 u32 portid
, u32 seq
, int type
, unsigned int flags
)
153 unsigned long now
= jiffies
;
154 struct nda_cacheinfo ci
;
155 struct nlmsghdr
*nlh
;
158 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(*ndm
), flags
);
162 ndm
= nlmsg_data(nlh
);
163 memset(ndm
, 0, sizeof(*ndm
));
164 ndm
->ndm_family
= AF_BRIDGE
;
165 ndm
->ndm_state
= fdb
->state
;
166 ndm
->ndm_ifindex
= vxlan
->dev
->ifindex
;
167 ndm
->ndm_flags
= NTF_SELF
;
168 ndm
->ndm_type
= NDA_DST
;
170 if (nla_put(skb
, NDA_LLADDR
, ETH_ALEN
, &fdb
->eth_addr
))
171 goto nla_put_failure
;
173 if (nla_put_be32(skb
, NDA_DST
, fdb
->remote_ip
))
174 goto nla_put_failure
;
176 ci
.ndm_used
= jiffies_to_clock_t(now
- fdb
->used
);
177 ci
.ndm_confirmed
= 0;
178 ci
.ndm_updated
= jiffies_to_clock_t(now
- fdb
->updated
);
181 if (nla_put(skb
, NDA_CACHEINFO
, sizeof(ci
), &ci
))
182 goto nla_put_failure
;
184 return nlmsg_end(skb
, nlh
);
187 nlmsg_cancel(skb
, nlh
);
191 static inline size_t vxlan_nlmsg_size(void)
193 return NLMSG_ALIGN(sizeof(struct ndmsg
))
194 + nla_total_size(ETH_ALEN
) /* NDA_LLADDR */
195 + nla_total_size(sizeof(__be32
)) /* NDA_DST */
196 + nla_total_size(sizeof(struct nda_cacheinfo
));
199 static void vxlan_fdb_notify(struct vxlan_dev
*vxlan
,
200 const struct vxlan_fdb
*fdb
, int type
)
202 struct net
*net
= dev_net(vxlan
->dev
);
206 skb
= nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC
);
210 err
= vxlan_fdb_info(skb
, vxlan
, fdb
, 0, 0, type
, 0);
212 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
213 WARN_ON(err
== -EMSGSIZE
);
218 rtnl_notify(skb
, net
, 0, RTNLGRP_NEIGH
, NULL
, GFP_ATOMIC
);
222 rtnl_set_sk_err(net
, RTNLGRP_NEIGH
, err
);
225 /* Hash Ethernet address */
226 static u32
eth_hash(const unsigned char *addr
)
228 u64 value
= get_unaligned((u64
*)addr
);
230 /* only want 6 bytes */
236 return hash_64(value
, FDB_HASH_BITS
);
239 /* Hash chain to use given mac address */
240 static inline struct hlist_head
*vxlan_fdb_head(struct vxlan_dev
*vxlan
,
243 return &vxlan
->fdb_head
[eth_hash(mac
)];
246 /* Look up Ethernet address in forwarding table */
247 static struct vxlan_fdb
*vxlan_find_mac(struct vxlan_dev
*vxlan
,
251 struct hlist_head
*head
= vxlan_fdb_head(vxlan
, mac
);
253 struct hlist_node
*node
;
255 hlist_for_each_entry_rcu(f
, node
, head
, hlist
) {
256 if (compare_ether_addr(mac
, f
->eth_addr
) == 0)
263 /* Add new entry to forwarding table -- assumes lock held */
264 static int vxlan_fdb_create(struct vxlan_dev
*vxlan
,
265 const u8
*mac
, __be32 ip
,
266 __u16 state
, __u16 flags
)
271 f
= vxlan_find_mac(vxlan
, mac
);
273 if (flags
& NLM_F_EXCL
) {
274 netdev_dbg(vxlan
->dev
,
275 "lost race to create %pM\n", mac
);
278 if (f
->state
!= state
) {
280 f
->updated
= jiffies
;
284 if (!(flags
& NLM_F_CREATE
))
287 if (vxlan
->addrmax
&& vxlan
->addrcnt
>= vxlan
->addrmax
)
290 netdev_dbg(vxlan
->dev
, "add %pM -> %pI4\n", mac
, &ip
);
291 f
= kmalloc(sizeof(*f
), GFP_ATOMIC
);
298 f
->updated
= f
->used
= jiffies
;
299 memcpy(f
->eth_addr
, mac
, ETH_ALEN
);
302 hlist_add_head_rcu(&f
->hlist
,
303 vxlan_fdb_head(vxlan
, mac
));
307 vxlan_fdb_notify(vxlan
, f
, RTM_NEWNEIGH
);
312 static void vxlan_fdb_destroy(struct vxlan_dev
*vxlan
, struct vxlan_fdb
*f
)
314 netdev_dbg(vxlan
->dev
,
315 "delete %pM\n", f
->eth_addr
);
318 vxlan_fdb_notify(vxlan
, f
, RTM_DELNEIGH
);
320 hlist_del_rcu(&f
->hlist
);
324 /* Add static entry (via netlink) */
325 static int vxlan_fdb_add(struct ndmsg
*ndm
, struct nlattr
*tb
[],
326 struct net_device
*dev
,
327 const unsigned char *addr
, u16 flags
)
329 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
333 if (!(ndm
->ndm_state
& (NUD_PERMANENT
|NUD_REACHABLE
))) {
334 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
339 if (tb
[NDA_DST
] == NULL
)
342 if (nla_len(tb
[NDA_DST
]) != sizeof(__be32
))
343 return -EAFNOSUPPORT
;
345 ip
= nla_get_be32(tb
[NDA_DST
]);
347 spin_lock_bh(&vxlan
->hash_lock
);
348 err
= vxlan_fdb_create(vxlan
, addr
, ip
, ndm
->ndm_state
, flags
);
349 spin_unlock_bh(&vxlan
->hash_lock
);
354 /* Delete entry (via netlink) */
355 static int vxlan_fdb_delete(struct ndmsg
*ndm
, struct net_device
*dev
,
356 const unsigned char *addr
)
358 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
362 spin_lock_bh(&vxlan
->hash_lock
);
363 f
= vxlan_find_mac(vxlan
, addr
);
365 vxlan_fdb_destroy(vxlan
, f
);
368 spin_unlock_bh(&vxlan
->hash_lock
);
373 /* Dump forwarding table */
374 static int vxlan_fdb_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
,
375 struct net_device
*dev
, int idx
)
377 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
380 for (h
= 0; h
< FDB_HASH_SIZE
; ++h
) {
382 struct hlist_node
*n
;
385 hlist_for_each_entry_rcu(f
, n
, &vxlan
->fdb_head
[h
], hlist
) {
386 if (idx
< cb
->args
[0])
389 err
= vxlan_fdb_info(skb
, vxlan
, f
,
390 NETLINK_CB(cb
->skb
).portid
,
404 /* Watch incoming packets to learn mapping between Ethernet address
405 * and Tunnel endpoint.
407 static void vxlan_snoop(struct net_device
*dev
,
408 __be32 src_ip
, const u8
*src_mac
)
410 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
414 f
= vxlan_find_mac(vxlan
, src_mac
);
417 if (likely(f
->remote_ip
== src_ip
))
422 "%pM migrated from %pI4 to %pI4\n",
423 src_mac
, &f
->remote_ip
, &src_ip
);
425 f
->remote_ip
= src_ip
;
426 f
->updated
= jiffies
;
428 /* learned new entry */
429 spin_lock(&vxlan
->hash_lock
);
430 err
= vxlan_fdb_create(vxlan
, src_mac
, src_ip
,
432 NLM_F_EXCL
|NLM_F_CREATE
);
433 spin_unlock(&vxlan
->hash_lock
);
438 /* See if multicast group is already in use by other ID */
439 static bool vxlan_group_used(struct vxlan_net
*vn
,
440 const struct vxlan_dev
*this)
442 const struct vxlan_dev
*vxlan
;
443 struct hlist_node
*node
;
446 for (h
= 0; h
< VNI_HASH_SIZE
; ++h
)
447 hlist_for_each_entry(vxlan
, node
, &vn
->vni_list
[h
], hlist
) {
451 if (!netif_running(vxlan
->dev
))
454 if (vxlan
->gaddr
== this->gaddr
)
461 /* kernel equivalent to IP_ADD_MEMBERSHIP */
462 static int vxlan_join_group(struct net_device
*dev
)
464 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
465 struct vxlan_net
*vn
= net_generic(dev_net(dev
), vxlan_net_id
);
466 struct sock
*sk
= vn
->sock
->sk
;
467 struct ip_mreqn mreq
= {
468 .imr_multiaddr
.s_addr
= vxlan
->gaddr
,
472 /* Already a member of group */
473 if (vxlan_group_used(vn
, vxlan
))
476 /* Need to drop RTNL to call multicast join */
479 err
= ip_mc_join_group(sk
, &mreq
);
487 /* kernel equivalent to IP_DROP_MEMBERSHIP */
488 static int vxlan_leave_group(struct net_device
*dev
)
490 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
491 struct vxlan_net
*vn
= net_generic(dev_net(dev
), vxlan_net_id
);
493 struct sock
*sk
= vn
->sock
->sk
;
494 struct ip_mreqn mreq
= {
495 .imr_multiaddr
.s_addr
= vxlan
->gaddr
,
498 /* Only leave group when last vxlan is done. */
499 if (vxlan_group_used(vn
, vxlan
))
502 /* Need to drop RTNL to call multicast leave */
505 err
= ip_mc_leave_group(sk
, &mreq
);
512 /* Callback from net/ipv4/udp.c to receive packets */
513 static int vxlan_udp_encap_recv(struct sock
*sk
, struct sk_buff
*skb
)
516 struct vxlanhdr
*vxh
;
517 struct vxlan_dev
*vxlan
;
518 struct vxlan_stats
*stats
;
522 /* pop off outer UDP header */
523 __skb_pull(skb
, sizeof(struct udphdr
));
525 /* Need Vxlan and inner Ethernet header to be present */
526 if (!pskb_may_pull(skb
, sizeof(struct vxlanhdr
)))
529 /* Drop packets with reserved bits set */
530 vxh
= (struct vxlanhdr
*) skb
->data
;
531 if (vxh
->vx_flags
!= htonl(VXLAN_FLAGS
) ||
532 (vxh
->vx_vni
& htonl(0xff))) {
533 netdev_dbg(skb
->dev
, "invalid vxlan flags=%#x vni=%#x\n",
534 ntohl(vxh
->vx_flags
), ntohl(vxh
->vx_vni
));
538 __skb_pull(skb
, sizeof(struct vxlanhdr
));
539 skb_postpull_rcsum(skb
, eth_hdr(skb
), sizeof(struct vxlanhdr
));
541 /* Is this VNI defined? */
542 vni
= ntohl(vxh
->vx_vni
) >> 8;
543 vxlan
= vxlan_find_vni(sock_net(sk
), vni
);
545 netdev_dbg(skb
->dev
, "unknown vni %d\n", vni
);
549 if (!pskb_may_pull(skb
, ETH_HLEN
)) {
550 vxlan
->dev
->stats
.rx_length_errors
++;
551 vxlan
->dev
->stats
.rx_errors
++;
555 /* Re-examine inner Ethernet packet */
557 skb
->protocol
= eth_type_trans(skb
, vxlan
->dev
);
558 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
560 /* Ignore packet loops (and multicast echo) */
561 if (compare_ether_addr(eth_hdr(skb
)->h_source
,
562 vxlan
->dev
->dev_addr
) == 0)
566 vxlan_snoop(skb
->dev
, oip
->saddr
, eth_hdr(skb
)->h_source
);
568 __skb_tunnel_rx(skb
, vxlan
->dev
);
569 skb_reset_network_header(skb
);
571 err
= IP_ECN_decapsulate(oip
, skb
);
574 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
575 &oip
->saddr
, oip
->tos
);
577 ++vxlan
->dev
->stats
.rx_frame_errors
;
578 ++vxlan
->dev
->stats
.rx_errors
;
583 stats
= this_cpu_ptr(vxlan
->stats
);
584 u64_stats_update_begin(&stats
->syncp
);
586 stats
->rx_bytes
+= skb
->len
;
587 u64_stats_update_end(&stats
->syncp
);
593 /* Put UDP header back */
594 __skb_push(skb
, sizeof(struct udphdr
));
598 /* Consume bad packet */
603 /* Extract dsfield from inner protocol */
604 static inline u8
vxlan_get_dsfield(const struct iphdr
*iph
,
605 const struct sk_buff
*skb
)
607 if (skb
->protocol
== htons(ETH_P_IP
))
609 else if (skb
->protocol
== htons(ETH_P_IPV6
))
610 return ipv6_get_dsfield((const struct ipv6hdr
*)iph
);
615 /* Propogate ECN bits out */
616 static inline u8
vxlan_ecn_encap(u8 tos
,
617 const struct iphdr
*iph
,
618 const struct sk_buff
*skb
)
620 u8 inner
= vxlan_get_dsfield(iph
, skb
);
622 return INET_ECN_encapsulate(tos
, inner
);
625 /* Transmit local packets over Vxlan
627 * Outer IP header inherits ECN and DF from inner header.
628 * Outer UDP destination is the VXLAN assigned port.
629 * source port is based on hash of flow if available
630 * otherwise use a random value
632 static netdev_tx_t
vxlan_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
634 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
636 const struct ethhdr
*eth
;
637 const struct iphdr
*old_iph
;
639 struct vxlanhdr
*vxh
;
643 unsigned int pkt_len
= skb
->len
;
650 /* Need space for new headers (invalidates iph ptr) */
651 if (skb_cow_head(skb
, VXLAN_HEADROOM
))
654 eth
= (void *)skb
->data
;
655 old_iph
= ip_hdr(skb
);
657 if (!is_multicast_ether_addr(eth
->h_dest
) &&
658 (f
= vxlan_find_mac(vxlan
, eth
->h_dest
)))
660 else if (vxlan
->gaddr
) {
666 if (!ttl
&& IN_MULTICAST(ntohl(dst
)))
671 tos
= vxlan_get_dsfield(old_iph
, skb
);
673 hash
= skb_get_rxhash(skb
);
675 rt
= ip_route_output_gre(dev_net(dev
), &fl4
, dst
,
676 vxlan
->saddr
, vxlan
->vni
,
677 RT_TOS(tos
), vxlan
->link
);
679 netdev_dbg(dev
, "no route to %pI4\n", &dst
);
680 dev
->stats
.tx_carrier_errors
++;
684 if (rt
->dst
.dev
== dev
) {
685 netdev_dbg(dev
, "circular route to %pI4\n", &dst
);
687 dev
->stats
.collisions
++;
691 memset(&(IPCB(skb
)->opt
), 0, sizeof(IPCB(skb
)->opt
));
692 IPCB(skb
)->flags
&= ~(IPSKB_XFRM_TUNNEL_SIZE
| IPSKB_XFRM_TRANSFORMED
|
695 skb_dst_set(skb
, &rt
->dst
);
697 vxh
= (struct vxlanhdr
*) __skb_push(skb
, sizeof(*vxh
));
698 vxh
->vx_flags
= htonl(VXLAN_FLAGS
);
699 vxh
->vx_vni
= htonl(vxlan
->vni
<< 8);
701 __skb_push(skb
, sizeof(*uh
));
702 skb_reset_transport_header(skb
);
705 uh
->dest
= htons(vxlan_port
);
706 uh
->source
= hash
? :random32();
708 uh
->len
= htons(skb
->len
);
711 __skb_push(skb
, sizeof(*iph
));
712 skb_reset_network_header(skb
);
715 iph
->ihl
= sizeof(struct iphdr
) >> 2;
717 iph
->protocol
= IPPROTO_UDP
;
718 iph
->tos
= vxlan_ecn_encap(tos
, old_iph
, skb
);
719 iph
->daddr
= fl4
.daddr
;
720 iph
->saddr
= fl4
.saddr
;
721 iph
->ttl
= ttl
? : ip4_dst_hoplimit(&rt
->dst
);
723 /* See __IPTUNNEL_XMIT */
724 skb
->ip_summed
= CHECKSUM_NONE
;
725 ip_select_ident(iph
, &rt
->dst
, NULL
);
727 err
= ip_local_out(skb
);
728 if (likely(net_xmit_eval(err
) == 0)) {
729 struct vxlan_stats
*stats
= this_cpu_ptr(vxlan
->stats
);
731 u64_stats_update_begin(&stats
->syncp
);
733 stats
->tx_bytes
+= pkt_len
;
734 u64_stats_update_end(&stats
->syncp
);
736 dev
->stats
.tx_errors
++;
737 dev
->stats
.tx_aborted_errors
++;
742 dev
->stats
.tx_dropped
++;
746 dev
->stats
.tx_errors
++;
752 /* Walk the forwarding table and purge stale entries */
753 static void vxlan_cleanup(unsigned long arg
)
755 struct vxlan_dev
*vxlan
= (struct vxlan_dev
*) arg
;
756 unsigned long next_timer
= jiffies
+ FDB_AGE_INTERVAL
;
759 if (!netif_running(vxlan
->dev
))
762 spin_lock_bh(&vxlan
->hash_lock
);
763 for (h
= 0; h
< FDB_HASH_SIZE
; ++h
) {
764 struct hlist_node
*p
, *n
;
765 hlist_for_each_safe(p
, n
, &vxlan
->fdb_head
[h
]) {
767 = container_of(p
, struct vxlan_fdb
, hlist
);
768 unsigned long timeout
;
770 if (f
->state
== NUD_PERMANENT
)
773 timeout
= f
->used
+ vxlan
->age_interval
* HZ
;
774 if (time_before_eq(timeout
, jiffies
)) {
775 netdev_dbg(vxlan
->dev
,
776 "garbage collect %pM\n",
778 f
->state
= NUD_STALE
;
779 vxlan_fdb_destroy(vxlan
, f
);
780 } else if (time_before(timeout
, next_timer
))
781 next_timer
= timeout
;
784 spin_unlock_bh(&vxlan
->hash_lock
);
786 mod_timer(&vxlan
->age_timer
, next_timer
);
789 /* Setup stats when device is created */
790 static int vxlan_init(struct net_device
*dev
)
792 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
794 vxlan
->stats
= alloc_percpu(struct vxlan_stats
);
801 /* Start ageing timer and join group when device is brought up */
802 static int vxlan_open(struct net_device
*dev
)
804 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
808 err
= vxlan_join_group(dev
);
813 if (vxlan
->age_interval
)
814 mod_timer(&vxlan
->age_timer
, jiffies
+ FDB_AGE_INTERVAL
);
819 /* Purge the forwarding table */
820 static void vxlan_flush(struct vxlan_dev
*vxlan
)
824 spin_lock_bh(&vxlan
->hash_lock
);
825 for (h
= 0; h
< FDB_HASH_SIZE
; ++h
) {
826 struct hlist_node
*p
, *n
;
827 hlist_for_each_safe(p
, n
, &vxlan
->fdb_head
[h
]) {
829 = container_of(p
, struct vxlan_fdb
, hlist
);
830 vxlan_fdb_destroy(vxlan
, f
);
833 spin_unlock_bh(&vxlan
->hash_lock
);
836 /* Cleanup timer and forwarding table on shutdown */
837 static int vxlan_stop(struct net_device
*dev
)
839 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
842 vxlan_leave_group(dev
);
844 del_timer_sync(&vxlan
->age_timer
);
851 /* Merge per-cpu statistics */
852 static struct rtnl_link_stats64
*vxlan_stats64(struct net_device
*dev
,
853 struct rtnl_link_stats64
*stats
)
855 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
856 struct vxlan_stats tmp
, sum
= { 0 };
859 for_each_possible_cpu(cpu
) {
861 const struct vxlan_stats
*stats
862 = per_cpu_ptr(vxlan
->stats
, cpu
);
865 start
= u64_stats_fetch_begin_bh(&stats
->syncp
);
866 memcpy(&tmp
, stats
, sizeof(tmp
));
867 } while (u64_stats_fetch_retry_bh(&stats
->syncp
, start
));
869 sum
.tx_bytes
+= tmp
.tx_bytes
;
870 sum
.tx_packets
+= tmp
.tx_packets
;
871 sum
.rx_bytes
+= tmp
.rx_bytes
;
872 sum
.rx_packets
+= tmp
.rx_packets
;
875 stats
->tx_bytes
= sum
.tx_bytes
;
876 stats
->tx_packets
= sum
.tx_packets
;
877 stats
->rx_bytes
= sum
.rx_bytes
;
878 stats
->rx_packets
= sum
.rx_packets
;
880 stats
->multicast
= dev
->stats
.multicast
;
881 stats
->rx_length_errors
= dev
->stats
.rx_length_errors
;
882 stats
->rx_frame_errors
= dev
->stats
.rx_frame_errors
;
883 stats
->rx_errors
= dev
->stats
.rx_errors
;
885 stats
->tx_dropped
= dev
->stats
.tx_dropped
;
886 stats
->tx_carrier_errors
= dev
->stats
.tx_carrier_errors
;
887 stats
->tx_aborted_errors
= dev
->stats
.tx_aborted_errors
;
888 stats
->collisions
= dev
->stats
.collisions
;
889 stats
->tx_errors
= dev
->stats
.tx_errors
;
894 /* Stub, nothing needs to be done. */
895 static void vxlan_set_multicast_list(struct net_device
*dev
)
899 static const struct net_device_ops vxlan_netdev_ops
= {
900 .ndo_init
= vxlan_init
,
901 .ndo_open
= vxlan_open
,
902 .ndo_stop
= vxlan_stop
,
903 .ndo_start_xmit
= vxlan_xmit
,
904 .ndo_get_stats64
= vxlan_stats64
,
905 .ndo_set_rx_mode
= vxlan_set_multicast_list
,
906 .ndo_change_mtu
= eth_change_mtu
,
907 .ndo_validate_addr
= eth_validate_addr
,
908 .ndo_set_mac_address
= eth_mac_addr
,
909 .ndo_fdb_add
= vxlan_fdb_add
,
910 .ndo_fdb_del
= vxlan_fdb_delete
,
911 .ndo_fdb_dump
= vxlan_fdb_dump
,
914 /* Info for udev, that this is a virtual tunnel endpoint */
915 static struct device_type vxlan_type
= {
919 static void vxlan_free(struct net_device
*dev
)
921 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
923 free_percpu(vxlan
->stats
);
927 /* Initialize the device structure. */
928 static void vxlan_setup(struct net_device
*dev
)
930 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
933 eth_hw_addr_random(dev
);
936 dev
->netdev_ops
= &vxlan_netdev_ops
;
937 dev
->destructor
= vxlan_free
;
938 SET_NETDEV_DEVTYPE(dev
, &vxlan_type
);
940 dev
->tx_queue_len
= 0;
941 dev
->features
|= NETIF_F_LLTX
;
942 dev
->features
|= NETIF_F_NETNS_LOCAL
;
943 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
945 spin_lock_init(&vxlan
->hash_lock
);
947 init_timer_deferrable(&vxlan
->age_timer
);
948 vxlan
->age_timer
.function
= vxlan_cleanup
;
949 vxlan
->age_timer
.data
= (unsigned long) vxlan
;
953 for (h
= 0; h
< FDB_HASH_SIZE
; ++h
)
954 INIT_HLIST_HEAD(&vxlan
->fdb_head
[h
]);
957 static const struct nla_policy vxlan_policy
[IFLA_VXLAN_MAX
+ 1] = {
958 [IFLA_VXLAN_ID
] = { .type
= NLA_U32
},
959 [IFLA_VXLAN_GROUP
] = { .len
= FIELD_SIZEOF(struct iphdr
, daddr
) },
960 [IFLA_VXLAN_LINK
] = { .type
= NLA_U32
},
961 [IFLA_VXLAN_LOCAL
] = { .len
= FIELD_SIZEOF(struct iphdr
, saddr
) },
962 [IFLA_VXLAN_TOS
] = { .type
= NLA_U8
},
963 [IFLA_VXLAN_TTL
] = { .type
= NLA_U8
},
964 [IFLA_VXLAN_LEARNING
] = { .type
= NLA_U8
},
965 [IFLA_VXLAN_AGEING
] = { .type
= NLA_U32
},
966 [IFLA_VXLAN_LIMIT
] = { .type
= NLA_U32
},
969 static int vxlan_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
971 if (tb
[IFLA_ADDRESS
]) {
972 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
) {
973 pr_debug("invalid link address (not ethernet)\n");
977 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
]))) {
978 pr_debug("invalid all zero ethernet address\n");
979 return -EADDRNOTAVAIL
;
986 if (data
[IFLA_VXLAN_ID
]) {
987 __u32 id
= nla_get_u32(data
[IFLA_VXLAN_ID
]);
988 if (id
>= VXLAN_VID_MASK
)
992 if (data
[IFLA_VXLAN_GROUP
]) {
993 __be32 gaddr
= nla_get_be32(data
[IFLA_VXLAN_GROUP
]);
994 if (!IN_MULTICAST(ntohl(gaddr
))) {
995 pr_debug("group address is not IPv4 multicast\n");
996 return -EADDRNOTAVAIL
;
1002 static int vxlan_newlink(struct net
*net
, struct net_device
*dev
,
1003 struct nlattr
*tb
[], struct nlattr
*data
[])
1005 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1009 if (!data
[IFLA_VXLAN_ID
])
1012 vni
= nla_get_u32(data
[IFLA_VXLAN_ID
]);
1013 if (vxlan_find_vni(net
, vni
)) {
1014 pr_info("duplicate VNI %u\n", vni
);
1019 if (data
[IFLA_VXLAN_GROUP
])
1020 vxlan
->gaddr
= nla_get_be32(data
[IFLA_VXLAN_GROUP
]);
1022 if (data
[IFLA_VXLAN_LOCAL
])
1023 vxlan
->saddr
= nla_get_be32(data
[IFLA_VXLAN_LOCAL
]);
1025 if (data
[IFLA_VXLAN_LINK
]) {
1026 vxlan
->link
= nla_get_u32(data
[IFLA_VXLAN_LINK
]);
1028 if (!tb
[IFLA_MTU
]) {
1029 struct net_device
*lowerdev
;
1030 lowerdev
= __dev_get_by_index(net
, vxlan
->link
);
1031 dev
->mtu
= lowerdev
->mtu
- VXLAN_HEADROOM
;
1035 if (data
[IFLA_VXLAN_TOS
])
1036 vxlan
->tos
= nla_get_u8(data
[IFLA_VXLAN_TOS
]);
1038 if (!data
[IFLA_VXLAN_LEARNING
] || nla_get_u8(data
[IFLA_VXLAN_LEARNING
]))
1039 vxlan
->learn
= true;
1041 if (data
[IFLA_VXLAN_AGEING
])
1042 vxlan
->age_interval
= nla_get_u32(data
[IFLA_VXLAN_AGEING
]);
1044 vxlan
->age_interval
= FDB_AGE_DEFAULT
;
1046 if (data
[IFLA_VXLAN_LIMIT
])
1047 vxlan
->addrmax
= nla_get_u32(data
[IFLA_VXLAN_LIMIT
]);
1049 err
= register_netdevice(dev
);
1051 hlist_add_head_rcu(&vxlan
->hlist
, vni_head(net
, vxlan
->vni
));
1056 static void vxlan_dellink(struct net_device
*dev
, struct list_head
*head
)
1058 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1060 hlist_del_rcu(&vxlan
->hlist
);
1062 unregister_netdevice_queue(dev
, head
);
1065 static size_t vxlan_get_size(const struct net_device
*dev
)
1068 return nla_total_size(sizeof(__u32
)) + /* IFLA_VXLAN_ID */
1069 nla_total_size(sizeof(__be32
)) +/* IFLA_VXLAN_GROUP */
1070 nla_total_size(sizeof(__u32
)) + /* IFLA_VXLAN_LINK */
1071 nla_total_size(sizeof(__be32
))+ /* IFLA_VXLAN_LOCAL */
1072 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_TTL */
1073 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_TOS */
1074 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_LEARNING */
1075 nla_total_size(sizeof(__u32
)) + /* IFLA_VXLAN_AGEING */
1076 nla_total_size(sizeof(__u32
)) + /* IFLA_VXLAN_LIMIT */
1080 static int vxlan_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
1082 const struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1084 if (nla_put_u32(skb
, IFLA_VXLAN_ID
, vxlan
->vni
))
1085 goto nla_put_failure
;
1087 if (vxlan
->gaddr
&& nla_put_u32(skb
, IFLA_VXLAN_GROUP
, vxlan
->gaddr
))
1088 goto nla_put_failure
;
1090 if (vxlan
->link
&& nla_put_u32(skb
, IFLA_VXLAN_LINK
, vxlan
->link
))
1091 goto nla_put_failure
;
1093 if (vxlan
->saddr
&& nla_put_u32(skb
, IFLA_VXLAN_LOCAL
, vxlan
->saddr
))
1094 goto nla_put_failure
;
1096 if (nla_put_u8(skb
, IFLA_VXLAN_TTL
, vxlan
->ttl
) ||
1097 nla_put_u8(skb
, IFLA_VXLAN_TOS
, vxlan
->tos
) ||
1098 nla_put_u8(skb
, IFLA_VXLAN_LEARNING
, vxlan
->learn
) ||
1099 nla_put_u32(skb
, IFLA_VXLAN_AGEING
, vxlan
->age_interval
) ||
1100 nla_put_u32(skb
, IFLA_VXLAN_LIMIT
, vxlan
->addrmax
))
1101 goto nla_put_failure
;
1109 static struct rtnl_link_ops vxlan_link_ops __read_mostly
= {
1111 .maxtype
= IFLA_VXLAN_MAX
,
1112 .policy
= vxlan_policy
,
1113 .priv_size
= sizeof(struct vxlan_dev
),
1114 .setup
= vxlan_setup
,
1115 .validate
= vxlan_validate
,
1116 .newlink
= vxlan_newlink
,
1117 .dellink
= vxlan_dellink
,
1118 .get_size
= vxlan_get_size
,
1119 .fill_info
= vxlan_fill_info
,
1122 static __net_init
int vxlan_init_net(struct net
*net
)
1124 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
1126 struct sockaddr_in vxlan_addr
= {
1127 .sin_family
= AF_INET
,
1128 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
1133 /* Create UDP socket for encapsulation receive. */
1134 rc
= sock_create_kern(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
, &vn
->sock
);
1136 pr_debug("UDP socket create failed\n");
1139 /* Put in proper namespace */
1141 sk_change_net(sk
, net
);
1143 vxlan_addr
.sin_port
= htons(vxlan_port
);
1145 rc
= kernel_bind(vn
->sock
, (struct sockaddr
*) &vxlan_addr
,
1146 sizeof(vxlan_addr
));
1148 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
1149 &vxlan_addr
.sin_addr
, ntohs(vxlan_addr
.sin_port
), rc
);
1150 sk_release_kernel(sk
);
1155 /* Disable multicast loopback */
1156 inet_sk(sk
)->mc_loop
= 0;
1158 /* Mark socket as an encapsulation socket. */
1159 udp_sk(sk
)->encap_type
= 1;
1160 udp_sk(sk
)->encap_rcv
= vxlan_udp_encap_recv
;
1163 for (h
= 0; h
< VNI_HASH_SIZE
; ++h
)
1164 INIT_HLIST_HEAD(&vn
->vni_list
[h
]);
1169 static __net_exit
void vxlan_exit_net(struct net
*net
)
1171 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
1174 sk_release_kernel(vn
->sock
->sk
);
1179 static struct pernet_operations vxlan_net_ops
= {
1180 .init
= vxlan_init_net
,
1181 .exit
= vxlan_exit_net
,
1182 .id
= &vxlan_net_id
,
1183 .size
= sizeof(struct vxlan_net
),
1186 static int __init
vxlan_init_module(void)
1190 get_random_bytes(&vxlan_salt
, sizeof(vxlan_salt
));
1192 rc
= register_pernet_device(&vxlan_net_ops
);
1196 rc
= rtnl_link_register(&vxlan_link_ops
);
1203 unregister_pernet_device(&vxlan_net_ops
);
1207 module_init(vxlan_init_module
);
1209 static void __exit
vxlan_cleanup_module(void)
1211 rtnl_link_unregister(&vxlan_link_ops
);
1212 unregister_pernet_device(&vxlan_net_ops
);
1214 module_exit(vxlan_cleanup_module
);
1216 MODULE_LICENSE("GPL");
1217 MODULE_VERSION(VXLAN_VERSION
);
1218 MODULE_AUTHOR("Stephen Hemminger <shemminger@vyatta.com>");
1219 MODULE_ALIAS_RTNL_LINK("vxlan");