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 VNI_HASH_BITS 10
48 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
49 #define FDB_HASH_BITS 8
50 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
51 #define FDB_AGE_DEFAULT 300 /* 5 min */
52 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
54 #define VXLAN_N_VID (1u << 24)
55 #define VXLAN_VID_MASK (VXLAN_N_VID - 1)
56 /* IP header + UDP + VXLAN + Ethernet header */
57 #define VXLAN_HEADROOM (20 + 8 + 8 + 14)
59 #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
61 /* VXLAN protocol header */
67 /* UDP port for VXLAN traffic.
68 * The IANA assigned port is 4789, but the Linux default is 8472
69 * for compatability with early adopters.
71 static unsigned int vxlan_port __read_mostly
= 8472;
72 module_param_named(udp_port
, vxlan_port
, uint
, 0444);
73 MODULE_PARM_DESC(udp_port
, "Destination UDP port");
75 static bool log_ecn_error
= true;
76 module_param(log_ecn_error
, bool, 0644);
77 MODULE_PARM_DESC(log_ecn_error
, "Log packets received with corrupted ECN");
79 /* per-net private data for this module */
80 static unsigned int vxlan_net_id
;
82 struct socket
*sock
; /* UDP encap socket */
83 struct hlist_head vni_list
[VNI_HASH_SIZE
];
92 struct vxlan_rdst
*remote_next
;
95 /* Forwarding table entry */
97 struct hlist_node hlist
; /* linked list of entries */
99 unsigned long updated
; /* jiffies */
101 struct vxlan_rdst remote
;
102 u16 state
; /* see ndm_state */
103 u8 flags
; /* see ndm_flags */
104 u8 eth_addr
[ETH_ALEN
];
107 /* Pseudo network device */
109 struct hlist_node hlist
;
110 struct net_device
*dev
;
111 struct vxlan_rdst default_dst
; /* default destination */
112 __be32 saddr
; /* source address */
114 __u16 port_min
; /* source port range */
116 __u8 tos
; /* TOS override */
118 u32 flags
; /* VXLAN_F_* below */
120 unsigned long age_interval
;
121 struct timer_list age_timer
;
122 spinlock_t hash_lock
;
123 unsigned int addrcnt
;
124 unsigned int addrmax
;
126 struct hlist_head fdb_head
[FDB_HASH_SIZE
];
129 #define VXLAN_F_LEARN 0x01
130 #define VXLAN_F_PROXY 0x02
131 #define VXLAN_F_RSC 0x04
132 #define VXLAN_F_L2MISS 0x08
133 #define VXLAN_F_L3MISS 0x10
135 /* salt for hash table */
136 static u32 vxlan_salt __read_mostly
;
138 static inline struct hlist_head
*vni_head(struct net
*net
, u32 id
)
140 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
142 return &vn
->vni_list
[hash_32(id
, VNI_HASH_BITS
)];
145 /* Look up VNI in a per net namespace table */
146 static struct vxlan_dev
*vxlan_find_vni(struct net
*net
, u32 id
)
148 struct vxlan_dev
*vxlan
;
150 hlist_for_each_entry_rcu(vxlan
, vni_head(net
, id
), hlist
) {
151 if (vxlan
->default_dst
.remote_vni
== id
)
158 /* Fill in neighbour message in skbuff. */
159 static int vxlan_fdb_info(struct sk_buff
*skb
, struct vxlan_dev
*vxlan
,
160 const struct vxlan_fdb
*fdb
,
161 u32 portid
, u32 seq
, int type
, unsigned int flags
,
162 const struct vxlan_rdst
*rdst
)
164 unsigned long now
= jiffies
;
165 struct nda_cacheinfo ci
;
166 struct nlmsghdr
*nlh
;
168 bool send_ip
, send_eth
;
170 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(*ndm
), flags
);
174 ndm
= nlmsg_data(nlh
);
175 memset(ndm
, 0, sizeof(*ndm
));
177 send_eth
= send_ip
= true;
179 if (type
== RTM_GETNEIGH
) {
180 ndm
->ndm_family
= AF_INET
;
181 send_ip
= rdst
->remote_ip
!= htonl(INADDR_ANY
);
182 send_eth
= !is_zero_ether_addr(fdb
->eth_addr
);
184 ndm
->ndm_family
= AF_BRIDGE
;
185 ndm
->ndm_state
= fdb
->state
;
186 ndm
->ndm_ifindex
= vxlan
->dev
->ifindex
;
187 ndm
->ndm_flags
= fdb
->flags
;
188 ndm
->ndm_type
= NDA_DST
;
190 if (send_eth
&& nla_put(skb
, NDA_LLADDR
, ETH_ALEN
, &fdb
->eth_addr
))
191 goto nla_put_failure
;
193 if (send_ip
&& nla_put_be32(skb
, NDA_DST
, rdst
->remote_ip
))
194 goto nla_put_failure
;
196 if (rdst
->remote_port
&& rdst
->remote_port
!= vxlan
->dst_port
&&
197 nla_put_be16(skb
, NDA_PORT
, rdst
->remote_port
))
198 goto nla_put_failure
;
199 if (rdst
->remote_vni
!= vxlan
->default_dst
.remote_vni
&&
200 nla_put_be32(skb
, NDA_VNI
, rdst
->remote_vni
))
201 goto nla_put_failure
;
202 if (rdst
->remote_ifindex
&&
203 nla_put_u32(skb
, NDA_IFINDEX
, rdst
->remote_ifindex
))
204 goto nla_put_failure
;
206 ci
.ndm_used
= jiffies_to_clock_t(now
- fdb
->used
);
207 ci
.ndm_confirmed
= 0;
208 ci
.ndm_updated
= jiffies_to_clock_t(now
- fdb
->updated
);
211 if (nla_put(skb
, NDA_CACHEINFO
, sizeof(ci
), &ci
))
212 goto nla_put_failure
;
214 return nlmsg_end(skb
, nlh
);
217 nlmsg_cancel(skb
, nlh
);
221 static inline size_t vxlan_nlmsg_size(void)
223 return NLMSG_ALIGN(sizeof(struct ndmsg
))
224 + nla_total_size(ETH_ALEN
) /* NDA_LLADDR */
225 + nla_total_size(sizeof(__be32
)) /* NDA_DST */
226 + nla_total_size(sizeof(__be16
)) /* NDA_PORT */
227 + nla_total_size(sizeof(__be32
)) /* NDA_VNI */
228 + nla_total_size(sizeof(__u32
)) /* NDA_IFINDEX */
229 + nla_total_size(sizeof(struct nda_cacheinfo
));
232 static void vxlan_fdb_notify(struct vxlan_dev
*vxlan
,
233 const struct vxlan_fdb
*fdb
, int type
)
235 struct net
*net
= dev_net(vxlan
->dev
);
239 skb
= nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC
);
243 err
= vxlan_fdb_info(skb
, vxlan
, fdb
, 0, 0, type
, 0, &fdb
->remote
);
245 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
246 WARN_ON(err
== -EMSGSIZE
);
251 rtnl_notify(skb
, net
, 0, RTNLGRP_NEIGH
, NULL
, GFP_ATOMIC
);
255 rtnl_set_sk_err(net
, RTNLGRP_NEIGH
, err
);
258 static void vxlan_ip_miss(struct net_device
*dev
, __be32 ipa
)
260 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
263 memset(&f
, 0, sizeof f
);
265 f
.remote
.remote_ip
= ipa
; /* goes to NDA_DST */
266 f
.remote
.remote_vni
= VXLAN_N_VID
;
268 vxlan_fdb_notify(vxlan
, &f
, RTM_GETNEIGH
);
271 static void vxlan_fdb_miss(struct vxlan_dev
*vxlan
, const u8 eth_addr
[ETH_ALEN
])
275 memset(&f
, 0, sizeof f
);
277 memcpy(f
.eth_addr
, eth_addr
, ETH_ALEN
);
279 vxlan_fdb_notify(vxlan
, &f
, RTM_GETNEIGH
);
282 /* Hash Ethernet address */
283 static u32
eth_hash(const unsigned char *addr
)
285 u64 value
= get_unaligned((u64
*)addr
);
287 /* only want 6 bytes */
293 return hash_64(value
, FDB_HASH_BITS
);
296 /* Hash chain to use given mac address */
297 static inline struct hlist_head
*vxlan_fdb_head(struct vxlan_dev
*vxlan
,
300 return &vxlan
->fdb_head
[eth_hash(mac
)];
303 /* Look up Ethernet address in forwarding table */
304 static struct vxlan_fdb
*vxlan_find_mac(struct vxlan_dev
*vxlan
,
308 struct hlist_head
*head
= vxlan_fdb_head(vxlan
, mac
);
311 hlist_for_each_entry_rcu(f
, head
, hlist
) {
312 if (compare_ether_addr(mac
, f
->eth_addr
) == 0)
319 /* Add/update destinations for multicast */
320 static int vxlan_fdb_append(struct vxlan_fdb
*f
,
321 __be32 ip
, __be16 port
, __u32 vni
, __u32 ifindex
)
323 struct vxlan_rdst
*rd_prev
, *rd
;
326 for (rd
= &f
->remote
; rd
; rd
= rd
->remote_next
) {
327 if (rd
->remote_ip
== ip
&&
328 rd
->remote_port
== port
&&
329 rd
->remote_vni
== vni
&&
330 rd
->remote_ifindex
== ifindex
)
334 rd
= kmalloc(sizeof(*rd
), GFP_ATOMIC
);
338 rd
->remote_port
= port
;
339 rd
->remote_vni
= vni
;
340 rd
->remote_ifindex
= ifindex
;
341 rd
->remote_next
= NULL
;
342 rd_prev
->remote_next
= rd
;
346 /* Add new entry to forwarding table -- assumes lock held */
347 static int vxlan_fdb_create(struct vxlan_dev
*vxlan
,
348 const u8
*mac
, __be32 ip
,
349 __u16 state
, __u16 flags
,
350 __be16 port
, __u32 vni
, __u32 ifindex
,
356 f
= vxlan_find_mac(vxlan
, mac
);
358 if (flags
& NLM_F_EXCL
) {
359 netdev_dbg(vxlan
->dev
,
360 "lost race to create %pM\n", mac
);
363 if (f
->state
!= state
) {
365 f
->updated
= jiffies
;
368 if (f
->flags
!= ndm_flags
) {
369 f
->flags
= ndm_flags
;
370 f
->updated
= jiffies
;
373 if ((flags
& NLM_F_APPEND
) &&
374 is_multicast_ether_addr(f
->eth_addr
)) {
375 int rc
= vxlan_fdb_append(f
, ip
, port
, vni
, ifindex
);
382 if (!(flags
& NLM_F_CREATE
))
385 if (vxlan
->addrmax
&& vxlan
->addrcnt
>= vxlan
->addrmax
)
388 netdev_dbg(vxlan
->dev
, "add %pM -> %pI4\n", mac
, &ip
);
389 f
= kmalloc(sizeof(*f
), GFP_ATOMIC
);
394 f
->remote
.remote_ip
= ip
;
395 f
->remote
.remote_port
= port
;
396 f
->remote
.remote_vni
= vni
;
397 f
->remote
.remote_ifindex
= ifindex
;
398 f
->remote
.remote_next
= NULL
;
400 f
->flags
= ndm_flags
;
401 f
->updated
= f
->used
= jiffies
;
402 memcpy(f
->eth_addr
, mac
, ETH_ALEN
);
405 hlist_add_head_rcu(&f
->hlist
,
406 vxlan_fdb_head(vxlan
, mac
));
410 vxlan_fdb_notify(vxlan
, f
, RTM_NEWNEIGH
);
415 static void vxlan_fdb_free(struct rcu_head
*head
)
417 struct vxlan_fdb
*f
= container_of(head
, struct vxlan_fdb
, rcu
);
419 while (f
->remote
.remote_next
) {
420 struct vxlan_rdst
*rd
= f
->remote
.remote_next
;
422 f
->remote
.remote_next
= rd
->remote_next
;
428 static void vxlan_fdb_destroy(struct vxlan_dev
*vxlan
, struct vxlan_fdb
*f
)
430 netdev_dbg(vxlan
->dev
,
431 "delete %pM\n", f
->eth_addr
);
434 vxlan_fdb_notify(vxlan
, f
, RTM_DELNEIGH
);
436 hlist_del_rcu(&f
->hlist
);
437 call_rcu(&f
->rcu
, vxlan_fdb_free
);
440 /* Add static entry (via netlink) */
441 static int vxlan_fdb_add(struct ndmsg
*ndm
, struct nlattr
*tb
[],
442 struct net_device
*dev
,
443 const unsigned char *addr
, u16 flags
)
445 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
446 struct net
*net
= dev_net(vxlan
->dev
);
452 if (!(ndm
->ndm_state
& (NUD_PERMANENT
|NUD_REACHABLE
))) {
453 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
458 if (tb
[NDA_DST
] == NULL
)
461 if (nla_len(tb
[NDA_DST
]) != sizeof(__be32
))
462 return -EAFNOSUPPORT
;
464 ip
= nla_get_be32(tb
[NDA_DST
]);
467 if (nla_len(tb
[NDA_PORT
]) != sizeof(__be16
))
469 port
= nla_get_be16(tb
[NDA_PORT
]);
471 port
= vxlan
->dst_port
;
474 if (nla_len(tb
[NDA_VNI
]) != sizeof(u32
))
476 vni
= nla_get_u32(tb
[NDA_VNI
]);
478 vni
= vxlan
->default_dst
.remote_vni
;
480 if (tb
[NDA_IFINDEX
]) {
481 struct net_device
*tdev
;
483 if (nla_len(tb
[NDA_IFINDEX
]) != sizeof(u32
))
485 ifindex
= nla_get_u32(tb
[NDA_IFINDEX
]);
486 tdev
= dev_get_by_index(net
, ifindex
);
488 return -EADDRNOTAVAIL
;
493 spin_lock_bh(&vxlan
->hash_lock
);
494 err
= vxlan_fdb_create(vxlan
, addr
, ip
, ndm
->ndm_state
, flags
,
495 port
, vni
, ifindex
, ndm
->ndm_flags
);
496 spin_unlock_bh(&vxlan
->hash_lock
);
501 /* Delete entry (via netlink) */
502 static int vxlan_fdb_delete(struct ndmsg
*ndm
, struct nlattr
*tb
[],
503 struct net_device
*dev
,
504 const unsigned char *addr
)
506 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
510 spin_lock_bh(&vxlan
->hash_lock
);
511 f
= vxlan_find_mac(vxlan
, addr
);
513 vxlan_fdb_destroy(vxlan
, f
);
516 spin_unlock_bh(&vxlan
->hash_lock
);
521 /* Dump forwarding table */
522 static int vxlan_fdb_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
,
523 struct net_device
*dev
, int idx
)
525 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
528 for (h
= 0; h
< FDB_HASH_SIZE
; ++h
) {
532 hlist_for_each_entry_rcu(f
, &vxlan
->fdb_head
[h
], hlist
) {
533 struct vxlan_rdst
*rd
;
534 for (rd
= &f
->remote
; rd
; rd
= rd
->remote_next
) {
535 if (idx
< cb
->args
[0])
538 err
= vxlan_fdb_info(skb
, vxlan
, f
,
539 NETLINK_CB(cb
->skb
).portid
,
554 /* Watch incoming packets to learn mapping between Ethernet address
555 * and Tunnel endpoint.
557 static void vxlan_snoop(struct net_device
*dev
,
558 __be32 src_ip
, const u8
*src_mac
)
560 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
564 f
= vxlan_find_mac(vxlan
, src_mac
);
567 if (likely(f
->remote
.remote_ip
== src_ip
))
572 "%pM migrated from %pI4 to %pI4\n",
573 src_mac
, &f
->remote
.remote_ip
, &src_ip
);
575 f
->remote
.remote_ip
= src_ip
;
576 f
->updated
= jiffies
;
578 /* learned new entry */
579 spin_lock(&vxlan
->hash_lock
);
580 err
= vxlan_fdb_create(vxlan
, src_mac
, src_ip
,
582 NLM_F_EXCL
|NLM_F_CREATE
,
584 vxlan
->default_dst
.remote_vni
,
586 spin_unlock(&vxlan
->hash_lock
);
591 /* See if multicast group is already in use by other ID */
592 static bool vxlan_group_used(struct vxlan_net
*vn
,
593 const struct vxlan_dev
*this)
595 const struct vxlan_dev
*vxlan
;
598 for (h
= 0; h
< VNI_HASH_SIZE
; ++h
)
599 hlist_for_each_entry(vxlan
, &vn
->vni_list
[h
], hlist
) {
603 if (!netif_running(vxlan
->dev
))
606 if (vxlan
->default_dst
.remote_ip
== this->default_dst
.remote_ip
)
613 /* kernel equivalent to IP_ADD_MEMBERSHIP */
614 static int vxlan_join_group(struct net_device
*dev
)
616 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
617 struct vxlan_net
*vn
= net_generic(dev_net(dev
), vxlan_net_id
);
618 struct sock
*sk
= vn
->sock
->sk
;
619 struct ip_mreqn mreq
= {
620 .imr_multiaddr
.s_addr
= vxlan
->default_dst
.remote_ip
,
621 .imr_ifindex
= vxlan
->default_dst
.remote_ifindex
,
625 /* Already a member of group */
626 if (vxlan_group_used(vn
, vxlan
))
629 /* Need to drop RTNL to call multicast join */
632 err
= ip_mc_join_group(sk
, &mreq
);
640 /* kernel equivalent to IP_DROP_MEMBERSHIP */
641 static int vxlan_leave_group(struct net_device
*dev
)
643 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
644 struct vxlan_net
*vn
= net_generic(dev_net(dev
), vxlan_net_id
);
646 struct sock
*sk
= vn
->sock
->sk
;
647 struct ip_mreqn mreq
= {
648 .imr_multiaddr
.s_addr
= vxlan
->default_dst
.remote_ip
,
649 .imr_ifindex
= vxlan
->default_dst
.remote_ifindex
,
652 /* Only leave group when last vxlan is done. */
653 if (vxlan_group_used(vn
, vxlan
))
656 /* Need to drop RTNL to call multicast leave */
659 err
= ip_mc_leave_group(sk
, &mreq
);
666 /* Callback from net/ipv4/udp.c to receive packets */
667 static int vxlan_udp_encap_recv(struct sock
*sk
, struct sk_buff
*skb
)
670 struct vxlanhdr
*vxh
;
671 struct vxlan_dev
*vxlan
;
672 struct pcpu_tstats
*stats
;
676 /* pop off outer UDP header */
677 __skb_pull(skb
, sizeof(struct udphdr
));
679 /* Need Vxlan and inner Ethernet header to be present */
680 if (!pskb_may_pull(skb
, sizeof(struct vxlanhdr
)))
683 /* Drop packets with reserved bits set */
684 vxh
= (struct vxlanhdr
*) skb
->data
;
685 if (vxh
->vx_flags
!= htonl(VXLAN_FLAGS
) ||
686 (vxh
->vx_vni
& htonl(0xff))) {
687 netdev_dbg(skb
->dev
, "invalid vxlan flags=%#x vni=%#x\n",
688 ntohl(vxh
->vx_flags
), ntohl(vxh
->vx_vni
));
692 __skb_pull(skb
, sizeof(struct vxlanhdr
));
694 /* Is this VNI defined? */
695 vni
= ntohl(vxh
->vx_vni
) >> 8;
696 vxlan
= vxlan_find_vni(sock_net(sk
), vni
);
698 netdev_dbg(skb
->dev
, "unknown vni %d\n", vni
);
702 if (!pskb_may_pull(skb
, ETH_HLEN
)) {
703 vxlan
->dev
->stats
.rx_length_errors
++;
704 vxlan
->dev
->stats
.rx_errors
++;
708 skb_reset_mac_header(skb
);
710 /* Re-examine inner Ethernet packet */
712 skb
->protocol
= eth_type_trans(skb
, vxlan
->dev
);
714 /* Ignore packet loops (and multicast echo) */
715 if (compare_ether_addr(eth_hdr(skb
)->h_source
,
716 vxlan
->dev
->dev_addr
) == 0)
719 if (vxlan
->flags
& VXLAN_F_LEARN
)
720 vxlan_snoop(skb
->dev
, oip
->saddr
, eth_hdr(skb
)->h_source
);
722 __skb_tunnel_rx(skb
, vxlan
->dev
);
723 skb_reset_network_header(skb
);
725 /* If the NIC driver gave us an encapsulated packet with
726 * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled,
727 * leave the CHECKSUM_UNNECESSARY, the device checksummed it
728 * for us. Otherwise force the upper layers to verify it.
730 if (skb
->ip_summed
!= CHECKSUM_UNNECESSARY
|| !skb
->encapsulation
||
731 !(vxlan
->dev
->features
& NETIF_F_RXCSUM
))
732 skb
->ip_summed
= CHECKSUM_NONE
;
734 skb
->encapsulation
= 0;
736 err
= IP_ECN_decapsulate(oip
, skb
);
739 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
740 &oip
->saddr
, oip
->tos
);
742 ++vxlan
->dev
->stats
.rx_frame_errors
;
743 ++vxlan
->dev
->stats
.rx_errors
;
748 stats
= this_cpu_ptr(vxlan
->dev
->tstats
);
749 u64_stats_update_begin(&stats
->syncp
);
751 stats
->rx_bytes
+= skb
->len
;
752 u64_stats_update_end(&stats
->syncp
);
758 /* Put UDP header back */
759 __skb_push(skb
, sizeof(struct udphdr
));
763 /* Consume bad packet */
768 static int arp_reduce(struct net_device
*dev
, struct sk_buff
*skb
)
770 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
776 if (dev
->flags
& IFF_NOARP
)
779 if (!pskb_may_pull(skb
, arp_hdr_len(dev
))) {
780 dev
->stats
.tx_dropped
++;
785 if ((parp
->ar_hrd
!= htons(ARPHRD_ETHER
) &&
786 parp
->ar_hrd
!= htons(ARPHRD_IEEE802
)) ||
787 parp
->ar_pro
!= htons(ETH_P_IP
) ||
788 parp
->ar_op
!= htons(ARPOP_REQUEST
) ||
789 parp
->ar_hln
!= dev
->addr_len
||
792 arpptr
= (u8
*)parp
+ sizeof(struct arphdr
);
794 arpptr
+= dev
->addr_len
; /* sha */
795 memcpy(&sip
, arpptr
, sizeof(sip
));
796 arpptr
+= sizeof(sip
);
797 arpptr
+= dev
->addr_len
; /* tha */
798 memcpy(&tip
, arpptr
, sizeof(tip
));
800 if (ipv4_is_loopback(tip
) ||
801 ipv4_is_multicast(tip
))
804 n
= neigh_lookup(&arp_tbl
, &tip
, dev
);
808 struct sk_buff
*reply
;
810 if (!(n
->nud_state
& NUD_CONNECTED
)) {
815 f
= vxlan_find_mac(vxlan
, n
->ha
);
816 if (f
&& f
->remote
.remote_ip
== htonl(INADDR_ANY
)) {
817 /* bridge-local neighbor */
822 reply
= arp_create(ARPOP_REPLY
, ETH_P_ARP
, sip
, dev
, tip
, sha
,
827 skb_reset_mac_header(reply
);
828 __skb_pull(reply
, skb_network_offset(reply
));
829 reply
->ip_summed
= CHECKSUM_UNNECESSARY
;
830 reply
->pkt_type
= PACKET_HOST
;
832 if (netif_rx_ni(reply
) == NET_RX_DROP
)
833 dev
->stats
.rx_dropped
++;
834 } else if (vxlan
->flags
& VXLAN_F_L3MISS
)
835 vxlan_ip_miss(dev
, tip
);
841 static bool route_shortcircuit(struct net_device
*dev
, struct sk_buff
*skb
)
843 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
847 if (is_multicast_ether_addr(eth_hdr(skb
)->h_dest
))
851 switch (ntohs(eth_hdr(skb
)->h_proto
)) {
853 if (!pskb_may_pull(skb
, sizeof(struct iphdr
)))
856 n
= neigh_lookup(&arp_tbl
, &pip
->daddr
, dev
);
865 diff
= compare_ether_addr(eth_hdr(skb
)->h_dest
, n
->ha
) != 0;
867 memcpy(eth_hdr(skb
)->h_source
, eth_hdr(skb
)->h_dest
,
869 memcpy(eth_hdr(skb
)->h_dest
, n
->ha
, dev
->addr_len
);
873 } else if (vxlan
->flags
& VXLAN_F_L3MISS
)
874 vxlan_ip_miss(dev
, pip
->daddr
);
878 static void vxlan_sock_free(struct sk_buff
*skb
)
883 /* On transmit, associate with the tunnel socket */
884 static void vxlan_set_owner(struct net_device
*dev
, struct sk_buff
*skb
)
886 struct vxlan_net
*vn
= net_generic(dev_net(dev
), vxlan_net_id
);
887 struct sock
*sk
= vn
->sock
->sk
;
892 skb
->destructor
= vxlan_sock_free
;
895 /* Compute source port for outgoing packet
896 * first choice to use L4 flow hash since it will spread
897 * better and maybe available from hardware
898 * secondary choice is to use jhash on the Ethernet header
900 static __be16
vxlan_src_port(const struct vxlan_dev
*vxlan
, struct sk_buff
*skb
)
902 unsigned int range
= (vxlan
->port_max
- vxlan
->port_min
) + 1;
905 hash
= skb_get_rxhash(skb
);
907 hash
= jhash(skb
->data
, 2 * ETH_ALEN
,
908 (__force u32
) skb
->protocol
);
910 return htons((((u64
) hash
* range
) >> 32) + vxlan
->port_min
);
913 static int handle_offloads(struct sk_buff
*skb
)
915 if (skb_is_gso(skb
)) {
916 int err
= skb_unclone(skb
, GFP_ATOMIC
);
920 skb_shinfo(skb
)->gso_type
|= SKB_GSO_UDP_TUNNEL
;
921 } else if (skb
->ip_summed
!= CHECKSUM_PARTIAL
)
922 skb
->ip_summed
= CHECKSUM_NONE
;
927 /* Bypass encapsulation if the destination is local */
928 static void vxlan_encap_bypass(struct sk_buff
*skb
, struct vxlan_dev
*src_vxlan
,
929 struct vxlan_dev
*dst_vxlan
)
931 struct pcpu_tstats
*tx_stats
= this_cpu_ptr(src_vxlan
->dev
->tstats
);
932 struct pcpu_tstats
*rx_stats
= this_cpu_ptr(dst_vxlan
->dev
->tstats
);
934 skb
->pkt_type
= PACKET_HOST
;
935 skb
->encapsulation
= 0;
936 skb
->dev
= dst_vxlan
->dev
;
937 __skb_pull(skb
, skb_network_offset(skb
));
939 if (dst_vxlan
->flags
& VXLAN_F_LEARN
)
940 vxlan_snoop(skb
->dev
, htonl(INADDR_LOOPBACK
),
941 eth_hdr(skb
)->h_source
);
943 u64_stats_update_begin(&tx_stats
->syncp
);
944 tx_stats
->tx_packets
++;
945 tx_stats
->tx_bytes
+= skb
->len
;
946 u64_stats_update_end(&tx_stats
->syncp
);
948 if (netif_rx(skb
) == NET_RX_SUCCESS
) {
949 u64_stats_update_begin(&rx_stats
->syncp
);
950 rx_stats
->rx_packets
++;
951 rx_stats
->rx_bytes
+= skb
->len
;
952 u64_stats_update_end(&rx_stats
->syncp
);
954 skb
->dev
->stats
.rx_dropped
++;
958 static netdev_tx_t
vxlan_xmit_one(struct sk_buff
*skb
, struct net_device
*dev
,
959 struct vxlan_rdst
*rdst
, bool did_rsc
)
961 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
963 const struct iphdr
*old_iph
;
965 struct vxlanhdr
*vxh
;
969 __be16 src_port
, dst_port
;
974 dst_port
= rdst
->remote_port
? rdst
->remote_port
: vxlan
->dst_port
;
975 vni
= rdst
->remote_vni
;
976 dst
= rdst
->remote_ip
;
980 /* short-circuited back to local bridge */
981 vxlan_encap_bypass(skb
, vxlan
, vxlan
);
987 if (!skb
->encapsulation
) {
988 skb_reset_inner_headers(skb
);
989 skb
->encapsulation
= 1;
992 /* Need space for new headers (invalidates iph ptr) */
993 if (skb_cow_head(skb
, VXLAN_HEADROOM
))
996 old_iph
= ip_hdr(skb
);
999 if (!ttl
&& IN_MULTICAST(ntohl(dst
)))
1004 tos
= ip_tunnel_get_dsfield(old_iph
, skb
);
1006 src_port
= vxlan_src_port(vxlan
, skb
);
1008 memset(&fl4
, 0, sizeof(fl4
));
1009 fl4
.flowi4_oif
= rdst
->remote_ifindex
;
1010 fl4
.flowi4_tos
= RT_TOS(tos
);
1012 fl4
.saddr
= vxlan
->saddr
;
1014 rt
= ip_route_output_key(dev_net(dev
), &fl4
);
1016 netdev_dbg(dev
, "no route to %pI4\n", &dst
);
1017 dev
->stats
.tx_carrier_errors
++;
1021 if (rt
->dst
.dev
== dev
) {
1022 netdev_dbg(dev
, "circular route to %pI4\n", &dst
);
1024 dev
->stats
.collisions
++;
1028 /* Bypass encapsulation if the destination is local */
1029 if (rt
->rt_flags
& RTCF_LOCAL
&&
1030 !(rt
->rt_flags
& (RTCF_BROADCAST
| RTCF_MULTICAST
))) {
1031 struct vxlan_dev
*dst_vxlan
;
1034 dst_vxlan
= vxlan_find_vni(dev_net(dev
), vni
);
1037 vxlan_encap_bypass(skb
, vxlan
, dst_vxlan
);
1038 return NETDEV_TX_OK
;
1041 memset(&(IPCB(skb
)->opt
), 0, sizeof(IPCB(skb
)->opt
));
1042 IPCB(skb
)->flags
&= ~(IPSKB_XFRM_TUNNEL_SIZE
| IPSKB_XFRM_TRANSFORMED
|
1045 skb_dst_set(skb
, &rt
->dst
);
1047 vxh
= (struct vxlanhdr
*) __skb_push(skb
, sizeof(*vxh
));
1048 vxh
->vx_flags
= htonl(VXLAN_FLAGS
);
1049 vxh
->vx_vni
= htonl(vni
<< 8);
1051 __skb_push(skb
, sizeof(*uh
));
1052 skb_reset_transport_header(skb
);
1055 uh
->dest
= dst_port
;
1056 uh
->source
= src_port
;
1058 uh
->len
= htons(skb
->len
);
1061 __skb_push(skb
, sizeof(*iph
));
1062 skb_reset_network_header(skb
);
1065 iph
->ihl
= sizeof(struct iphdr
) >> 2;
1067 iph
->protocol
= IPPROTO_UDP
;
1068 iph
->tos
= ip_tunnel_ecn_encap(tos
, old_iph
, skb
);
1070 iph
->saddr
= fl4
.saddr
;
1071 iph
->ttl
= ttl
? : ip4_dst_hoplimit(&rt
->dst
);
1072 tunnel_ip_select_ident(skb
, old_iph
, &rt
->dst
);
1076 vxlan_set_owner(dev
, skb
);
1078 if (handle_offloads(skb
))
1081 iptunnel_xmit(skb
, dev
);
1082 return NETDEV_TX_OK
;
1085 dev
->stats
.tx_dropped
++;
1089 dev
->stats
.tx_errors
++;
1092 return NETDEV_TX_OK
;
1095 /* Transmit local packets over Vxlan
1097 * Outer IP header inherits ECN and DF from inner header.
1098 * Outer UDP destination is the VXLAN assigned port.
1099 * source port is based on hash of flow
1101 static netdev_tx_t
vxlan_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
1103 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1105 bool did_rsc
= false;
1106 struct vxlan_rdst
*rdst0
, *rdst
;
1107 struct vxlan_fdb
*f
;
1110 skb_reset_mac_header(skb
);
1113 if ((vxlan
->flags
& VXLAN_F_PROXY
) && ntohs(eth
->h_proto
) == ETH_P_ARP
)
1114 return arp_reduce(dev
, skb
);
1116 f
= vxlan_find_mac(vxlan
, eth
->h_dest
);
1119 if (f
&& (f
->flags
& NTF_ROUTER
) && (vxlan
->flags
& VXLAN_F_RSC
) &&
1120 ntohs(eth
->h_proto
) == ETH_P_IP
) {
1121 did_rsc
= route_shortcircuit(dev
, skb
);
1123 f
= vxlan_find_mac(vxlan
, eth
->h_dest
);
1127 rdst0
= &vxlan
->default_dst
;
1129 if (rdst0
->remote_ip
== htonl(INADDR_ANY
) &&
1130 (vxlan
->flags
& VXLAN_F_L2MISS
) &&
1131 !is_multicast_ether_addr(eth
->h_dest
))
1132 vxlan_fdb_miss(vxlan
, eth
->h_dest
);
1138 /* if there are multiple destinations, send copies */
1139 for (rdst
= rdst0
->remote_next
; rdst
; rdst
= rdst
->remote_next
) {
1140 struct sk_buff
*skb1
;
1142 skb1
= skb_clone(skb
, GFP_ATOMIC
);
1143 rc1
= vxlan_xmit_one(skb1
, dev
, rdst
, did_rsc
);
1144 if (rc
== NETDEV_TX_OK
)
1148 rc1
= vxlan_xmit_one(skb
, dev
, rdst0
, did_rsc
);
1149 if (rc
== NETDEV_TX_OK
)
1154 /* Walk the forwarding table and purge stale entries */
1155 static void vxlan_cleanup(unsigned long arg
)
1157 struct vxlan_dev
*vxlan
= (struct vxlan_dev
*) arg
;
1158 unsigned long next_timer
= jiffies
+ FDB_AGE_INTERVAL
;
1161 if (!netif_running(vxlan
->dev
))
1164 spin_lock_bh(&vxlan
->hash_lock
);
1165 for (h
= 0; h
< FDB_HASH_SIZE
; ++h
) {
1166 struct hlist_node
*p
, *n
;
1167 hlist_for_each_safe(p
, n
, &vxlan
->fdb_head
[h
]) {
1169 = container_of(p
, struct vxlan_fdb
, hlist
);
1170 unsigned long timeout
;
1172 if (f
->state
& NUD_PERMANENT
)
1175 timeout
= f
->used
+ vxlan
->age_interval
* HZ
;
1176 if (time_before_eq(timeout
, jiffies
)) {
1177 netdev_dbg(vxlan
->dev
,
1178 "garbage collect %pM\n",
1180 f
->state
= NUD_STALE
;
1181 vxlan_fdb_destroy(vxlan
, f
);
1182 } else if (time_before(timeout
, next_timer
))
1183 next_timer
= timeout
;
1186 spin_unlock_bh(&vxlan
->hash_lock
);
1188 mod_timer(&vxlan
->age_timer
, next_timer
);
1191 /* Setup stats when device is created */
1192 static int vxlan_init(struct net_device
*dev
)
1194 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
1201 /* Start ageing timer and join group when device is brought up */
1202 static int vxlan_open(struct net_device
*dev
)
1204 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1207 if (IN_MULTICAST(ntohl(vxlan
->default_dst
.remote_ip
))) {
1208 err
= vxlan_join_group(dev
);
1213 if (vxlan
->age_interval
)
1214 mod_timer(&vxlan
->age_timer
, jiffies
+ FDB_AGE_INTERVAL
);
1219 /* Purge the forwarding table */
1220 static void vxlan_flush(struct vxlan_dev
*vxlan
)
1224 spin_lock_bh(&vxlan
->hash_lock
);
1225 for (h
= 0; h
< FDB_HASH_SIZE
; ++h
) {
1226 struct hlist_node
*p
, *n
;
1227 hlist_for_each_safe(p
, n
, &vxlan
->fdb_head
[h
]) {
1229 = container_of(p
, struct vxlan_fdb
, hlist
);
1230 vxlan_fdb_destroy(vxlan
, f
);
1233 spin_unlock_bh(&vxlan
->hash_lock
);
1236 /* Cleanup timer and forwarding table on shutdown */
1237 static int vxlan_stop(struct net_device
*dev
)
1239 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1241 if (IN_MULTICAST(ntohl(vxlan
->default_dst
.remote_ip
)))
1242 vxlan_leave_group(dev
);
1244 del_timer_sync(&vxlan
->age_timer
);
1251 /* Stub, nothing needs to be done. */
1252 static void vxlan_set_multicast_list(struct net_device
*dev
)
1256 static const struct net_device_ops vxlan_netdev_ops
= {
1257 .ndo_init
= vxlan_init
,
1258 .ndo_open
= vxlan_open
,
1259 .ndo_stop
= vxlan_stop
,
1260 .ndo_start_xmit
= vxlan_xmit
,
1261 .ndo_get_stats64
= ip_tunnel_get_stats64
,
1262 .ndo_set_rx_mode
= vxlan_set_multicast_list
,
1263 .ndo_change_mtu
= eth_change_mtu
,
1264 .ndo_validate_addr
= eth_validate_addr
,
1265 .ndo_set_mac_address
= eth_mac_addr
,
1266 .ndo_fdb_add
= vxlan_fdb_add
,
1267 .ndo_fdb_del
= vxlan_fdb_delete
,
1268 .ndo_fdb_dump
= vxlan_fdb_dump
,
1271 /* Info for udev, that this is a virtual tunnel endpoint */
1272 static struct device_type vxlan_type
= {
1276 static void vxlan_free(struct net_device
*dev
)
1278 free_percpu(dev
->tstats
);
1282 /* Initialize the device structure. */
1283 static void vxlan_setup(struct net_device
*dev
)
1285 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1289 eth_hw_addr_random(dev
);
1291 dev
->hard_header_len
= ETH_HLEN
+ VXLAN_HEADROOM
;
1293 dev
->netdev_ops
= &vxlan_netdev_ops
;
1294 dev
->destructor
= vxlan_free
;
1295 SET_NETDEV_DEVTYPE(dev
, &vxlan_type
);
1297 dev
->tx_queue_len
= 0;
1298 dev
->features
|= NETIF_F_LLTX
;
1299 dev
->features
|= NETIF_F_NETNS_LOCAL
;
1300 dev
->features
|= NETIF_F_SG
| NETIF_F_HW_CSUM
;
1301 dev
->features
|= NETIF_F_RXCSUM
;
1302 dev
->features
|= NETIF_F_GSO_SOFTWARE
;
1304 dev
->hw_features
|= NETIF_F_SG
| NETIF_F_HW_CSUM
| NETIF_F_RXCSUM
;
1305 dev
->hw_features
|= NETIF_F_GSO_SOFTWARE
;
1306 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
1307 dev
->priv_flags
|= IFF_LIVE_ADDR_CHANGE
;
1309 spin_lock_init(&vxlan
->hash_lock
);
1311 init_timer_deferrable(&vxlan
->age_timer
);
1312 vxlan
->age_timer
.function
= vxlan_cleanup
;
1313 vxlan
->age_timer
.data
= (unsigned long) vxlan
;
1315 inet_get_local_port_range(&low
, &high
);
1316 vxlan
->port_min
= low
;
1317 vxlan
->port_max
= high
;
1318 vxlan
->dst_port
= htons(vxlan_port
);
1322 for (h
= 0; h
< FDB_HASH_SIZE
; ++h
)
1323 INIT_HLIST_HEAD(&vxlan
->fdb_head
[h
]);
1326 static const struct nla_policy vxlan_policy
[IFLA_VXLAN_MAX
+ 1] = {
1327 [IFLA_VXLAN_ID
] = { .type
= NLA_U32
},
1328 [IFLA_VXLAN_GROUP
] = { .len
= FIELD_SIZEOF(struct iphdr
, daddr
) },
1329 [IFLA_VXLAN_LINK
] = { .type
= NLA_U32
},
1330 [IFLA_VXLAN_LOCAL
] = { .len
= FIELD_SIZEOF(struct iphdr
, saddr
) },
1331 [IFLA_VXLAN_TOS
] = { .type
= NLA_U8
},
1332 [IFLA_VXLAN_TTL
] = { .type
= NLA_U8
},
1333 [IFLA_VXLAN_LEARNING
] = { .type
= NLA_U8
},
1334 [IFLA_VXLAN_AGEING
] = { .type
= NLA_U32
},
1335 [IFLA_VXLAN_LIMIT
] = { .type
= NLA_U32
},
1336 [IFLA_VXLAN_PORT_RANGE
] = { .len
= sizeof(struct ifla_vxlan_port_range
) },
1337 [IFLA_VXLAN_PROXY
] = { .type
= NLA_U8
},
1338 [IFLA_VXLAN_RSC
] = { .type
= NLA_U8
},
1339 [IFLA_VXLAN_L2MISS
] = { .type
= NLA_U8
},
1340 [IFLA_VXLAN_L3MISS
] = { .type
= NLA_U8
},
1341 [IFLA_VXLAN_PORT
] = { .type
= NLA_U16
},
1344 static int vxlan_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
1346 if (tb
[IFLA_ADDRESS
]) {
1347 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
) {
1348 pr_debug("invalid link address (not ethernet)\n");
1352 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
]))) {
1353 pr_debug("invalid all zero ethernet address\n");
1354 return -EADDRNOTAVAIL
;
1361 if (data
[IFLA_VXLAN_ID
]) {
1362 __u32 id
= nla_get_u32(data
[IFLA_VXLAN_ID
]);
1363 if (id
>= VXLAN_VID_MASK
)
1367 if (data
[IFLA_VXLAN_PORT_RANGE
]) {
1368 const struct ifla_vxlan_port_range
*p
1369 = nla_data(data
[IFLA_VXLAN_PORT_RANGE
]);
1371 if (ntohs(p
->high
) < ntohs(p
->low
)) {
1372 pr_debug("port range %u .. %u not valid\n",
1373 ntohs(p
->low
), ntohs(p
->high
));
1381 static void vxlan_get_drvinfo(struct net_device
*netdev
,
1382 struct ethtool_drvinfo
*drvinfo
)
1384 strlcpy(drvinfo
->version
, VXLAN_VERSION
, sizeof(drvinfo
->version
));
1385 strlcpy(drvinfo
->driver
, "vxlan", sizeof(drvinfo
->driver
));
1388 static const struct ethtool_ops vxlan_ethtool_ops
= {
1389 .get_drvinfo
= vxlan_get_drvinfo
,
1390 .get_link
= ethtool_op_get_link
,
1393 static int vxlan_newlink(struct net
*net
, struct net_device
*dev
,
1394 struct nlattr
*tb
[], struct nlattr
*data
[])
1396 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1397 struct vxlan_rdst
*dst
= &vxlan
->default_dst
;
1401 if (!data
[IFLA_VXLAN_ID
])
1404 vni
= nla_get_u32(data
[IFLA_VXLAN_ID
]);
1405 if (vxlan_find_vni(net
, vni
)) {
1406 pr_info("duplicate VNI %u\n", vni
);
1409 dst
->remote_vni
= vni
;
1411 if (data
[IFLA_VXLAN_GROUP
])
1412 dst
->remote_ip
= nla_get_be32(data
[IFLA_VXLAN_GROUP
]);
1414 if (data
[IFLA_VXLAN_LOCAL
])
1415 vxlan
->saddr
= nla_get_be32(data
[IFLA_VXLAN_LOCAL
]);
1417 if (data
[IFLA_VXLAN_LINK
] &&
1418 (dst
->remote_ifindex
= nla_get_u32(data
[IFLA_VXLAN_LINK
]))) {
1419 struct net_device
*lowerdev
1420 = __dev_get_by_index(net
, dst
->remote_ifindex
);
1423 pr_info("ifindex %d does not exist\n", dst
->remote_ifindex
);
1428 dev
->mtu
= lowerdev
->mtu
- VXLAN_HEADROOM
;
1430 /* update header length based on lower device */
1431 dev
->hard_header_len
= lowerdev
->hard_header_len
+
1435 if (data
[IFLA_VXLAN_TOS
])
1436 vxlan
->tos
= nla_get_u8(data
[IFLA_VXLAN_TOS
]);
1438 if (data
[IFLA_VXLAN_TTL
])
1439 vxlan
->ttl
= nla_get_u8(data
[IFLA_VXLAN_TTL
]);
1441 if (!data
[IFLA_VXLAN_LEARNING
] || nla_get_u8(data
[IFLA_VXLAN_LEARNING
]))
1442 vxlan
->flags
|= VXLAN_F_LEARN
;
1444 if (data
[IFLA_VXLAN_AGEING
])
1445 vxlan
->age_interval
= nla_get_u32(data
[IFLA_VXLAN_AGEING
]);
1447 vxlan
->age_interval
= FDB_AGE_DEFAULT
;
1449 if (data
[IFLA_VXLAN_PROXY
] && nla_get_u8(data
[IFLA_VXLAN_PROXY
]))
1450 vxlan
->flags
|= VXLAN_F_PROXY
;
1452 if (data
[IFLA_VXLAN_RSC
] && nla_get_u8(data
[IFLA_VXLAN_RSC
]))
1453 vxlan
->flags
|= VXLAN_F_RSC
;
1455 if (data
[IFLA_VXLAN_L2MISS
] && nla_get_u8(data
[IFLA_VXLAN_L2MISS
]))
1456 vxlan
->flags
|= VXLAN_F_L2MISS
;
1458 if (data
[IFLA_VXLAN_L3MISS
] && nla_get_u8(data
[IFLA_VXLAN_L3MISS
]))
1459 vxlan
->flags
|= VXLAN_F_L3MISS
;
1461 if (data
[IFLA_VXLAN_LIMIT
])
1462 vxlan
->addrmax
= nla_get_u32(data
[IFLA_VXLAN_LIMIT
]);
1464 if (data
[IFLA_VXLAN_PORT_RANGE
]) {
1465 const struct ifla_vxlan_port_range
*p
1466 = nla_data(data
[IFLA_VXLAN_PORT_RANGE
]);
1467 vxlan
->port_min
= ntohs(p
->low
);
1468 vxlan
->port_max
= ntohs(p
->high
);
1471 if (data
[IFLA_VXLAN_PORT
])
1472 vxlan
->dst_port
= nla_get_be16(data
[IFLA_VXLAN_PORT
]);
1474 SET_ETHTOOL_OPS(dev
, &vxlan_ethtool_ops
);
1476 err
= register_netdevice(dev
);
1478 hlist_add_head_rcu(&vxlan
->hlist
, vni_head(net
, dst
->remote_vni
));
1483 static void vxlan_dellink(struct net_device
*dev
, struct list_head
*head
)
1485 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1487 hlist_del_rcu(&vxlan
->hlist
);
1489 unregister_netdevice_queue(dev
, head
);
1492 static size_t vxlan_get_size(const struct net_device
*dev
)
1495 return nla_total_size(sizeof(__u32
)) + /* IFLA_VXLAN_ID */
1496 nla_total_size(sizeof(__be32
)) +/* IFLA_VXLAN_GROUP */
1497 nla_total_size(sizeof(__u32
)) + /* IFLA_VXLAN_LINK */
1498 nla_total_size(sizeof(__be32
))+ /* IFLA_VXLAN_LOCAL */
1499 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_TTL */
1500 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_TOS */
1501 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_LEARNING */
1502 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_PROXY */
1503 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_RSC */
1504 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_L2MISS */
1505 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_L3MISS */
1506 nla_total_size(sizeof(__u32
)) + /* IFLA_VXLAN_AGEING */
1507 nla_total_size(sizeof(__u32
)) + /* IFLA_VXLAN_LIMIT */
1508 nla_total_size(sizeof(struct ifla_vxlan_port_range
)) +
1509 nla_total_size(sizeof(__be16
))+ /* IFLA_VXLAN_PORT */
1513 static int vxlan_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
1515 const struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1516 const struct vxlan_rdst
*dst
= &vxlan
->default_dst
;
1517 struct ifla_vxlan_port_range ports
= {
1518 .low
= htons(vxlan
->port_min
),
1519 .high
= htons(vxlan
->port_max
),
1522 if (nla_put_u32(skb
, IFLA_VXLAN_ID
, dst
->remote_vni
))
1523 goto nla_put_failure
;
1525 if (dst
->remote_ip
&& nla_put_be32(skb
, IFLA_VXLAN_GROUP
, dst
->remote_ip
))
1526 goto nla_put_failure
;
1528 if (dst
->remote_ifindex
&& nla_put_u32(skb
, IFLA_VXLAN_LINK
, dst
->remote_ifindex
))
1529 goto nla_put_failure
;
1531 if (vxlan
->saddr
&& nla_put_be32(skb
, IFLA_VXLAN_LOCAL
, vxlan
->saddr
))
1532 goto nla_put_failure
;
1534 if (nla_put_u8(skb
, IFLA_VXLAN_TTL
, vxlan
->ttl
) ||
1535 nla_put_u8(skb
, IFLA_VXLAN_TOS
, vxlan
->tos
) ||
1536 nla_put_u8(skb
, IFLA_VXLAN_LEARNING
,
1537 !!(vxlan
->flags
& VXLAN_F_LEARN
)) ||
1538 nla_put_u8(skb
, IFLA_VXLAN_PROXY
,
1539 !!(vxlan
->flags
& VXLAN_F_PROXY
)) ||
1540 nla_put_u8(skb
, IFLA_VXLAN_RSC
, !!(vxlan
->flags
& VXLAN_F_RSC
)) ||
1541 nla_put_u8(skb
, IFLA_VXLAN_L2MISS
,
1542 !!(vxlan
->flags
& VXLAN_F_L2MISS
)) ||
1543 nla_put_u8(skb
, IFLA_VXLAN_L3MISS
,
1544 !!(vxlan
->flags
& VXLAN_F_L3MISS
)) ||
1545 nla_put_u32(skb
, IFLA_VXLAN_AGEING
, vxlan
->age_interval
) ||
1546 nla_put_u32(skb
, IFLA_VXLAN_LIMIT
, vxlan
->addrmax
) ||
1547 nla_put_be16(skb
, IFLA_VXLAN_PORT
, vxlan
->dst_port
))
1548 goto nla_put_failure
;
1550 if (nla_put(skb
, IFLA_VXLAN_PORT_RANGE
, sizeof(ports
), &ports
))
1551 goto nla_put_failure
;
1559 static struct rtnl_link_ops vxlan_link_ops __read_mostly
= {
1561 .maxtype
= IFLA_VXLAN_MAX
,
1562 .policy
= vxlan_policy
,
1563 .priv_size
= sizeof(struct vxlan_dev
),
1564 .setup
= vxlan_setup
,
1565 .validate
= vxlan_validate
,
1566 .newlink
= vxlan_newlink
,
1567 .dellink
= vxlan_dellink
,
1568 .get_size
= vxlan_get_size
,
1569 .fill_info
= vxlan_fill_info
,
1572 static __net_init
int vxlan_init_net(struct net
*net
)
1574 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
1576 struct sockaddr_in vxlan_addr
= {
1577 .sin_family
= AF_INET
,
1578 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
1583 /* Create UDP socket for encapsulation receive. */
1584 rc
= sock_create_kern(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
, &vn
->sock
);
1586 pr_debug("UDP socket create failed\n");
1589 /* Put in proper namespace */
1591 sk_change_net(sk
, net
);
1593 vxlan_addr
.sin_port
= htons(vxlan_port
);
1595 rc
= kernel_bind(vn
->sock
, (struct sockaddr
*) &vxlan_addr
,
1596 sizeof(vxlan_addr
));
1598 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
1599 &vxlan_addr
.sin_addr
, ntohs(vxlan_addr
.sin_port
), rc
);
1600 sk_release_kernel(sk
);
1605 /* Disable multicast loopback */
1606 inet_sk(sk
)->mc_loop
= 0;
1608 /* Mark socket as an encapsulation socket. */
1609 udp_sk(sk
)->encap_type
= 1;
1610 udp_sk(sk
)->encap_rcv
= vxlan_udp_encap_recv
;
1613 for (h
= 0; h
< VNI_HASH_SIZE
; ++h
)
1614 INIT_HLIST_HEAD(&vn
->vni_list
[h
]);
1619 static __net_exit
void vxlan_exit_net(struct net
*net
)
1621 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
1622 struct vxlan_dev
*vxlan
;
1626 for (h
= 0; h
< VNI_HASH_SIZE
; ++h
)
1627 hlist_for_each_entry(vxlan
, &vn
->vni_list
[h
], hlist
)
1628 dev_close(vxlan
->dev
);
1632 sk_release_kernel(vn
->sock
->sk
);
1637 static struct pernet_operations vxlan_net_ops
= {
1638 .init
= vxlan_init_net
,
1639 .exit
= vxlan_exit_net
,
1640 .id
= &vxlan_net_id
,
1641 .size
= sizeof(struct vxlan_net
),
1644 static int __init
vxlan_init_module(void)
1648 get_random_bytes(&vxlan_salt
, sizeof(vxlan_salt
));
1650 rc
= register_pernet_device(&vxlan_net_ops
);
1654 rc
= rtnl_link_register(&vxlan_link_ops
);
1661 unregister_pernet_device(&vxlan_net_ops
);
1665 module_init(vxlan_init_module
);
1667 static void __exit
vxlan_cleanup_module(void)
1669 rtnl_link_unregister(&vxlan_link_ops
);
1670 unregister_pernet_device(&vxlan_net_ops
);
1673 module_exit(vxlan_cleanup_module
);
1675 MODULE_LICENSE("GPL");
1676 MODULE_VERSION(VXLAN_VERSION
);
1677 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
1678 MODULE_ALIAS_RTNL_LINK("vxlan");