2 * VXLAN: Virtual eXtensible Local Area Network
4 * Copyright (c) 2012-2013 Vyatta Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/module.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/rculist.h>
20 #include <linux/netdevice.h>
23 #include <linux/udp.h>
24 #include <linux/igmp.h>
25 #include <linux/etherdevice.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/hash.h>
29 #include <linux/ethtool.h>
31 #include <net/ndisc.h>
33 #include <net/ip_tunnels.h>
36 #include <net/udp_tunnel.h>
37 #include <net/rtnetlink.h>
38 #include <net/route.h>
39 #include <net/dsfield.h>
40 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/vxlan.h>
44 #include <net/protocol.h>
45 #include <net/udp_tunnel.h>
46 #if IS_ENABLED(CONFIG_IPV6)
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/ip6_checksum.h>
53 #define VXLAN_VERSION "0.1"
55 #define PORT_HASH_BITS 8
56 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
57 #define VNI_HASH_BITS 10
58 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
59 #define FDB_HASH_BITS 8
60 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
61 #define FDB_AGE_DEFAULT 300 /* 5 min */
62 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
64 /* UDP port for VXLAN traffic.
65 * The IANA assigned port is 4789, but the Linux default is 8472
66 * for compatibility with early adopters.
68 static unsigned short vxlan_port __read_mostly
= 8472;
69 module_param_named(udp_port
, vxlan_port
, ushort
, 0444);
70 MODULE_PARM_DESC(udp_port
, "Destination UDP port");
72 static bool log_ecn_error
= true;
73 module_param(log_ecn_error
, bool, 0644);
74 MODULE_PARM_DESC(log_ecn_error
, "Log packets received with corrupted ECN");
76 static int vxlan_net_id
;
78 static const u8 all_zeros_mac
[ETH_ALEN
];
80 /* per-network namespace private data for this module */
82 struct list_head vxlan_list
;
83 struct hlist_head sock_list
[PORT_HASH_SIZE
];
88 struct sockaddr_in sin
;
89 struct sockaddr_in6 sin6
;
94 union vxlan_addr remote_ip
;
98 struct list_head list
;
102 /* Forwarding table entry */
104 struct hlist_node hlist
; /* linked list of entries */
106 unsigned long updated
; /* jiffies */
108 struct list_head remotes
;
109 u16 state
; /* see ndm_state */
110 u8 flags
; /* see ndm_flags */
111 u8 eth_addr
[ETH_ALEN
];
114 /* Pseudo network device */
116 struct hlist_node hlist
; /* vni hash table */
117 struct list_head next
; /* vxlan's per namespace list */
118 struct vxlan_sock
*vn_sock
; /* listening socket */
119 struct net_device
*dev
;
120 struct net
*net
; /* netns for packet i/o */
121 struct vxlan_rdst default_dst
; /* default destination */
122 union vxlan_addr saddr
; /* source address */
124 __u16 port_min
; /* source port range */
126 __u8 tos
; /* TOS override */
128 u32 flags
; /* VXLAN_F_* in vxlan.h */
130 struct work_struct sock_work
;
131 struct work_struct igmp_join
;
132 struct work_struct igmp_leave
;
134 unsigned long age_interval
;
135 struct timer_list age_timer
;
136 spinlock_t hash_lock
;
137 unsigned int addrcnt
;
138 unsigned int addrmax
;
140 struct hlist_head fdb_head
[FDB_HASH_SIZE
];
143 /* salt for hash table */
144 static u32 vxlan_salt __read_mostly
;
145 static struct workqueue_struct
*vxlan_wq
;
147 static void vxlan_sock_work(struct work_struct
*work
);
149 #if IS_ENABLED(CONFIG_IPV6)
151 bool vxlan_addr_equal(const union vxlan_addr
*a
, const union vxlan_addr
*b
)
153 if (a
->sa
.sa_family
!= b
->sa
.sa_family
)
155 if (a
->sa
.sa_family
== AF_INET6
)
156 return ipv6_addr_equal(&a
->sin6
.sin6_addr
, &b
->sin6
.sin6_addr
);
158 return a
->sin
.sin_addr
.s_addr
== b
->sin
.sin_addr
.s_addr
;
161 static inline bool vxlan_addr_any(const union vxlan_addr
*ipa
)
163 if (ipa
->sa
.sa_family
== AF_INET6
)
164 return ipv6_addr_any(&ipa
->sin6
.sin6_addr
);
166 return ipa
->sin
.sin_addr
.s_addr
== htonl(INADDR_ANY
);
169 static inline bool vxlan_addr_multicast(const union vxlan_addr
*ipa
)
171 if (ipa
->sa
.sa_family
== AF_INET6
)
172 return ipv6_addr_is_multicast(&ipa
->sin6
.sin6_addr
);
174 return IN_MULTICAST(ntohl(ipa
->sin
.sin_addr
.s_addr
));
177 static int vxlan_nla_get_addr(union vxlan_addr
*ip
, struct nlattr
*nla
)
179 if (nla_len(nla
) >= sizeof(struct in6_addr
)) {
180 nla_memcpy(&ip
->sin6
.sin6_addr
, nla
, sizeof(struct in6_addr
));
181 ip
->sa
.sa_family
= AF_INET6
;
183 } else if (nla_len(nla
) >= sizeof(__be32
)) {
184 ip
->sin
.sin_addr
.s_addr
= nla_get_be32(nla
);
185 ip
->sa
.sa_family
= AF_INET
;
188 return -EAFNOSUPPORT
;
192 static int vxlan_nla_put_addr(struct sk_buff
*skb
, int attr
,
193 const union vxlan_addr
*ip
)
195 if (ip
->sa
.sa_family
== AF_INET6
)
196 return nla_put(skb
, attr
, sizeof(struct in6_addr
), &ip
->sin6
.sin6_addr
);
198 return nla_put_be32(skb
, attr
, ip
->sin
.sin_addr
.s_addr
);
201 #else /* !CONFIG_IPV6 */
204 bool vxlan_addr_equal(const union vxlan_addr
*a
, const union vxlan_addr
*b
)
206 return a
->sin
.sin_addr
.s_addr
== b
->sin
.sin_addr
.s_addr
;
209 static inline bool vxlan_addr_any(const union vxlan_addr
*ipa
)
211 return ipa
->sin
.sin_addr
.s_addr
== htonl(INADDR_ANY
);
214 static inline bool vxlan_addr_multicast(const union vxlan_addr
*ipa
)
216 return IN_MULTICAST(ntohl(ipa
->sin
.sin_addr
.s_addr
));
219 static int vxlan_nla_get_addr(union vxlan_addr
*ip
, struct nlattr
*nla
)
221 if (nla_len(nla
) >= sizeof(struct in6_addr
)) {
222 return -EAFNOSUPPORT
;
223 } else if (nla_len(nla
) >= sizeof(__be32
)) {
224 ip
->sin
.sin_addr
.s_addr
= nla_get_be32(nla
);
225 ip
->sa
.sa_family
= AF_INET
;
228 return -EAFNOSUPPORT
;
232 static int vxlan_nla_put_addr(struct sk_buff
*skb
, int attr
,
233 const union vxlan_addr
*ip
)
235 return nla_put_be32(skb
, attr
, ip
->sin
.sin_addr
.s_addr
);
239 /* Virtual Network hash table head */
240 static inline struct hlist_head
*vni_head(struct vxlan_sock
*vs
, u32 id
)
242 return &vs
->vni_list
[hash_32(id
, VNI_HASH_BITS
)];
245 /* Socket hash table head */
246 static inline struct hlist_head
*vs_head(struct net
*net
, __be16 port
)
248 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
250 return &vn
->sock_list
[hash_32(ntohs(port
), PORT_HASH_BITS
)];
253 /* First remote destination for a forwarding entry.
254 * Guaranteed to be non-NULL because remotes are never deleted.
256 static inline struct vxlan_rdst
*first_remote_rcu(struct vxlan_fdb
*fdb
)
258 return list_entry_rcu(fdb
->remotes
.next
, struct vxlan_rdst
, list
);
261 static inline struct vxlan_rdst
*first_remote_rtnl(struct vxlan_fdb
*fdb
)
263 return list_first_entry(&fdb
->remotes
, struct vxlan_rdst
, list
);
266 /* Find VXLAN socket based on network namespace, address family and UDP port
267 * and enabled unshareable flags.
269 static struct vxlan_sock
*vxlan_find_sock(struct net
*net
, sa_family_t family
,
270 __be16 port
, u32 flags
)
272 struct vxlan_sock
*vs
;
274 flags
&= VXLAN_F_RCV_FLAGS
;
276 hlist_for_each_entry_rcu(vs
, vs_head(net
, port
), hlist
) {
277 if (inet_sk(vs
->sock
->sk
)->inet_sport
== port
&&
278 inet_sk(vs
->sock
->sk
)->sk
.sk_family
== family
&&
285 static struct vxlan_dev
*vxlan_vs_find_vni(struct vxlan_sock
*vs
, u32 id
)
287 struct vxlan_dev
*vxlan
;
289 hlist_for_each_entry_rcu(vxlan
, vni_head(vs
, id
), hlist
) {
290 if (vxlan
->default_dst
.remote_vni
== id
)
297 /* Look up VNI in a per net namespace table */
298 static struct vxlan_dev
*vxlan_find_vni(struct net
*net
, u32 id
,
299 sa_family_t family
, __be16 port
,
302 struct vxlan_sock
*vs
;
304 vs
= vxlan_find_sock(net
, family
, port
, flags
);
308 return vxlan_vs_find_vni(vs
, id
);
311 /* Fill in neighbour message in skbuff. */
312 static int vxlan_fdb_info(struct sk_buff
*skb
, struct vxlan_dev
*vxlan
,
313 const struct vxlan_fdb
*fdb
,
314 u32 portid
, u32 seq
, int type
, unsigned int flags
,
315 const struct vxlan_rdst
*rdst
)
317 unsigned long now
= jiffies
;
318 struct nda_cacheinfo ci
;
319 struct nlmsghdr
*nlh
;
321 bool send_ip
, send_eth
;
323 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(*ndm
), flags
);
327 ndm
= nlmsg_data(nlh
);
328 memset(ndm
, 0, sizeof(*ndm
));
330 send_eth
= send_ip
= true;
332 if (type
== RTM_GETNEIGH
) {
333 ndm
->ndm_family
= AF_INET
;
334 send_ip
= !vxlan_addr_any(&rdst
->remote_ip
);
335 send_eth
= !is_zero_ether_addr(fdb
->eth_addr
);
337 ndm
->ndm_family
= AF_BRIDGE
;
338 ndm
->ndm_state
= fdb
->state
;
339 ndm
->ndm_ifindex
= vxlan
->dev
->ifindex
;
340 ndm
->ndm_flags
= fdb
->flags
;
341 ndm
->ndm_type
= RTN_UNICAST
;
343 if (!net_eq(dev_net(vxlan
->dev
), vxlan
->net
) &&
344 nla_put_s32(skb
, NDA_LINK_NETNSID
,
345 peernet2id(dev_net(vxlan
->dev
), vxlan
->net
)))
346 goto nla_put_failure
;
348 if (send_eth
&& nla_put(skb
, NDA_LLADDR
, ETH_ALEN
, &fdb
->eth_addr
))
349 goto nla_put_failure
;
351 if (send_ip
&& vxlan_nla_put_addr(skb
, NDA_DST
, &rdst
->remote_ip
))
352 goto nla_put_failure
;
354 if (rdst
->remote_port
&& rdst
->remote_port
!= vxlan
->dst_port
&&
355 nla_put_be16(skb
, NDA_PORT
, rdst
->remote_port
))
356 goto nla_put_failure
;
357 if (rdst
->remote_vni
!= vxlan
->default_dst
.remote_vni
&&
358 nla_put_u32(skb
, NDA_VNI
, rdst
->remote_vni
))
359 goto nla_put_failure
;
360 if (rdst
->remote_ifindex
&&
361 nla_put_u32(skb
, NDA_IFINDEX
, rdst
->remote_ifindex
))
362 goto nla_put_failure
;
364 ci
.ndm_used
= jiffies_to_clock_t(now
- fdb
->used
);
365 ci
.ndm_confirmed
= 0;
366 ci
.ndm_updated
= jiffies_to_clock_t(now
- fdb
->updated
);
369 if (nla_put(skb
, NDA_CACHEINFO
, sizeof(ci
), &ci
))
370 goto nla_put_failure
;
376 nlmsg_cancel(skb
, nlh
);
380 static inline size_t vxlan_nlmsg_size(void)
382 return NLMSG_ALIGN(sizeof(struct ndmsg
))
383 + nla_total_size(ETH_ALEN
) /* NDA_LLADDR */
384 + nla_total_size(sizeof(struct in6_addr
)) /* NDA_DST */
385 + nla_total_size(sizeof(__be16
)) /* NDA_PORT */
386 + nla_total_size(sizeof(__be32
)) /* NDA_VNI */
387 + nla_total_size(sizeof(__u32
)) /* NDA_IFINDEX */
388 + nla_total_size(sizeof(__s32
)) /* NDA_LINK_NETNSID */
389 + nla_total_size(sizeof(struct nda_cacheinfo
));
392 static void vxlan_fdb_notify(struct vxlan_dev
*vxlan
, struct vxlan_fdb
*fdb
,
393 struct vxlan_rdst
*rd
, int type
)
395 struct net
*net
= dev_net(vxlan
->dev
);
399 skb
= nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC
);
403 err
= vxlan_fdb_info(skb
, vxlan
, fdb
, 0, 0, type
, 0, rd
);
405 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
406 WARN_ON(err
== -EMSGSIZE
);
411 rtnl_notify(skb
, net
, 0, RTNLGRP_NEIGH
, NULL
, GFP_ATOMIC
);
415 rtnl_set_sk_err(net
, RTNLGRP_NEIGH
, err
);
418 static void vxlan_ip_miss(struct net_device
*dev
, union vxlan_addr
*ipa
)
420 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
421 struct vxlan_fdb f
= {
424 struct vxlan_rdst remote
= {
425 .remote_ip
= *ipa
, /* goes to NDA_DST */
426 .remote_vni
= VXLAN_N_VID
,
429 vxlan_fdb_notify(vxlan
, &f
, &remote
, RTM_GETNEIGH
);
432 static void vxlan_fdb_miss(struct vxlan_dev
*vxlan
, const u8 eth_addr
[ETH_ALEN
])
434 struct vxlan_fdb f
= {
437 struct vxlan_rdst remote
= { };
439 memcpy(f
.eth_addr
, eth_addr
, ETH_ALEN
);
441 vxlan_fdb_notify(vxlan
, &f
, &remote
, RTM_GETNEIGH
);
444 /* Hash Ethernet address */
445 static u32
eth_hash(const unsigned char *addr
)
447 u64 value
= get_unaligned((u64
*)addr
);
449 /* only want 6 bytes */
455 return hash_64(value
, FDB_HASH_BITS
);
458 /* Hash chain to use given mac address */
459 static inline struct hlist_head
*vxlan_fdb_head(struct vxlan_dev
*vxlan
,
462 return &vxlan
->fdb_head
[eth_hash(mac
)];
465 /* Look up Ethernet address in forwarding table */
466 static struct vxlan_fdb
*__vxlan_find_mac(struct vxlan_dev
*vxlan
,
469 struct hlist_head
*head
= vxlan_fdb_head(vxlan
, mac
);
472 hlist_for_each_entry_rcu(f
, head
, hlist
) {
473 if (ether_addr_equal(mac
, f
->eth_addr
))
480 static struct vxlan_fdb
*vxlan_find_mac(struct vxlan_dev
*vxlan
,
485 f
= __vxlan_find_mac(vxlan
, mac
);
492 /* caller should hold vxlan->hash_lock */
493 static struct vxlan_rdst
*vxlan_fdb_find_rdst(struct vxlan_fdb
*f
,
494 union vxlan_addr
*ip
, __be16 port
,
495 __u32 vni
, __u32 ifindex
)
497 struct vxlan_rdst
*rd
;
499 list_for_each_entry(rd
, &f
->remotes
, list
) {
500 if (vxlan_addr_equal(&rd
->remote_ip
, ip
) &&
501 rd
->remote_port
== port
&&
502 rd
->remote_vni
== vni
&&
503 rd
->remote_ifindex
== ifindex
)
510 /* Replace destination of unicast mac */
511 static int vxlan_fdb_replace(struct vxlan_fdb
*f
,
512 union vxlan_addr
*ip
, __be16 port
, __u32 vni
, __u32 ifindex
)
514 struct vxlan_rdst
*rd
;
516 rd
= vxlan_fdb_find_rdst(f
, ip
, port
, vni
, ifindex
);
520 rd
= list_first_entry_or_null(&f
->remotes
, struct vxlan_rdst
, list
);
524 rd
->remote_port
= port
;
525 rd
->remote_vni
= vni
;
526 rd
->remote_ifindex
= ifindex
;
530 /* Add/update destinations for multicast */
531 static int vxlan_fdb_append(struct vxlan_fdb
*f
,
532 union vxlan_addr
*ip
, __be16 port
, __u32 vni
,
533 __u32 ifindex
, struct vxlan_rdst
**rdp
)
535 struct vxlan_rdst
*rd
;
537 rd
= vxlan_fdb_find_rdst(f
, ip
, port
, vni
, ifindex
);
541 rd
= kmalloc(sizeof(*rd
), GFP_ATOMIC
);
545 rd
->remote_port
= port
;
546 rd
->remote_vni
= vni
;
547 rd
->remote_ifindex
= ifindex
;
549 list_add_tail_rcu(&rd
->list
, &f
->remotes
);
555 static struct vxlanhdr
*vxlan_gro_remcsum(struct sk_buff
*skb
,
557 struct vxlanhdr
*vh
, size_t hdrlen
,
560 size_t start
, offset
, plen
;
562 if (skb
->remcsum_offload
)
565 if (!NAPI_GRO_CB(skb
)->csum_valid
)
568 start
= (data
& VXLAN_RCO_MASK
) << VXLAN_RCO_SHIFT
;
569 offset
= start
+ ((data
& VXLAN_RCO_UDP
) ?
570 offsetof(struct udphdr
, check
) :
571 offsetof(struct tcphdr
, check
));
573 plen
= hdrlen
+ offset
+ sizeof(u16
);
575 /* Pull checksum that will be written */
576 if (skb_gro_header_hard(skb
, off
+ plen
)) {
577 vh
= skb_gro_header_slow(skb
, off
+ plen
, off
);
582 skb_gro_remcsum_process(skb
, (void *)vh
+ hdrlen
, start
, offset
);
584 skb
->remcsum_offload
= 1;
589 static struct sk_buff
**vxlan_gro_receive(struct sk_buff
**head
,
591 struct udp_offload
*uoff
)
593 struct sk_buff
*p
, **pp
= NULL
;
594 struct vxlanhdr
*vh
, *vh2
;
595 unsigned int hlen
, off_vx
;
597 struct vxlan_sock
*vs
= container_of(uoff
, struct vxlan_sock
,
601 off_vx
= skb_gro_offset(skb
);
602 hlen
= off_vx
+ sizeof(*vh
);
603 vh
= skb_gro_header_fast(skb
, off_vx
);
604 if (skb_gro_header_hard(skb
, hlen
)) {
605 vh
= skb_gro_header_slow(skb
, hlen
, off_vx
);
610 skb_gro_pull(skb
, sizeof(struct vxlanhdr
)); /* pull vxlan header */
611 skb_gro_postpull_rcsum(skb
, vh
, sizeof(struct vxlanhdr
));
613 flags
= ntohl(vh
->vx_flags
);
615 if ((flags
& VXLAN_HF_RCO
) && (vs
->flags
& VXLAN_F_REMCSUM_RX
)) {
616 vh
= vxlan_gro_remcsum(skb
, off_vx
, vh
, sizeof(struct vxlanhdr
),
625 for (p
= *head
; p
; p
= p
->next
) {
626 if (!NAPI_GRO_CB(p
)->same_flow
)
629 vh2
= (struct vxlanhdr
*)(p
->data
+ off_vx
);
630 if (vh
->vx_flags
!= vh2
->vx_flags
||
631 vh
->vx_vni
!= vh2
->vx_vni
) {
632 NAPI_GRO_CB(p
)->same_flow
= 0;
637 pp
= eth_gro_receive(head
, skb
);
640 NAPI_GRO_CB(skb
)->flush
|= flush
;
645 static int vxlan_gro_complete(struct sk_buff
*skb
, int nhoff
,
646 struct udp_offload
*uoff
)
648 udp_tunnel_gro_complete(skb
, nhoff
);
650 return eth_gro_complete(skb
, nhoff
+ sizeof(struct vxlanhdr
));
653 /* Notify netdevs that UDP port started listening */
654 static void vxlan_notify_add_rx_port(struct vxlan_sock
*vs
)
656 struct net_device
*dev
;
657 struct sock
*sk
= vs
->sock
->sk
;
658 struct net
*net
= sock_net(sk
);
659 sa_family_t sa_family
= sk
->sk_family
;
660 __be16 port
= inet_sk(sk
)->inet_sport
;
663 if (sa_family
== AF_INET
) {
664 err
= udp_add_offload(&vs
->udp_offloads
);
666 pr_warn("vxlan: udp_add_offload failed with status %d\n", err
);
670 for_each_netdev_rcu(net
, dev
) {
671 if (dev
->netdev_ops
->ndo_add_vxlan_port
)
672 dev
->netdev_ops
->ndo_add_vxlan_port(dev
, sa_family
,
678 /* Notify netdevs that UDP port is no more listening */
679 static void vxlan_notify_del_rx_port(struct vxlan_sock
*vs
)
681 struct net_device
*dev
;
682 struct sock
*sk
= vs
->sock
->sk
;
683 struct net
*net
= sock_net(sk
);
684 sa_family_t sa_family
= sk
->sk_family
;
685 __be16 port
= inet_sk(sk
)->inet_sport
;
688 for_each_netdev_rcu(net
, dev
) {
689 if (dev
->netdev_ops
->ndo_del_vxlan_port
)
690 dev
->netdev_ops
->ndo_del_vxlan_port(dev
, sa_family
,
695 if (sa_family
== AF_INET
)
696 udp_del_offload(&vs
->udp_offloads
);
699 /* Add new entry to forwarding table -- assumes lock held */
700 static int vxlan_fdb_create(struct vxlan_dev
*vxlan
,
701 const u8
*mac
, union vxlan_addr
*ip
,
702 __u16 state
, __u16 flags
,
703 __be16 port
, __u32 vni
, __u32 ifindex
,
706 struct vxlan_rdst
*rd
= NULL
;
710 f
= __vxlan_find_mac(vxlan
, mac
);
712 if (flags
& NLM_F_EXCL
) {
713 netdev_dbg(vxlan
->dev
,
714 "lost race to create %pM\n", mac
);
717 if (f
->state
!= state
) {
719 f
->updated
= jiffies
;
722 if (f
->flags
!= ndm_flags
) {
723 f
->flags
= ndm_flags
;
724 f
->updated
= jiffies
;
727 if ((flags
& NLM_F_REPLACE
)) {
728 /* Only change unicasts */
729 if (!(is_multicast_ether_addr(f
->eth_addr
) ||
730 is_zero_ether_addr(f
->eth_addr
))) {
731 int rc
= vxlan_fdb_replace(f
, ip
, port
, vni
,
740 if ((flags
& NLM_F_APPEND
) &&
741 (is_multicast_ether_addr(f
->eth_addr
) ||
742 is_zero_ether_addr(f
->eth_addr
))) {
743 int rc
= vxlan_fdb_append(f
, ip
, port
, vni
, ifindex
,
751 if (!(flags
& NLM_F_CREATE
))
754 if (vxlan
->addrmax
&& vxlan
->addrcnt
>= vxlan
->addrmax
)
757 /* Disallow replace to add a multicast entry */
758 if ((flags
& NLM_F_REPLACE
) &&
759 (is_multicast_ether_addr(mac
) || is_zero_ether_addr(mac
)))
762 netdev_dbg(vxlan
->dev
, "add %pM -> %pIS\n", mac
, ip
);
763 f
= kmalloc(sizeof(*f
), GFP_ATOMIC
);
769 f
->flags
= ndm_flags
;
770 f
->updated
= f
->used
= jiffies
;
771 INIT_LIST_HEAD(&f
->remotes
);
772 memcpy(f
->eth_addr
, mac
, ETH_ALEN
);
774 vxlan_fdb_append(f
, ip
, port
, vni
, ifindex
, &rd
);
777 hlist_add_head_rcu(&f
->hlist
,
778 vxlan_fdb_head(vxlan
, mac
));
783 rd
= first_remote_rtnl(f
);
784 vxlan_fdb_notify(vxlan
, f
, rd
, RTM_NEWNEIGH
);
790 static void vxlan_fdb_free(struct rcu_head
*head
)
792 struct vxlan_fdb
*f
= container_of(head
, struct vxlan_fdb
, rcu
);
793 struct vxlan_rdst
*rd
, *nd
;
795 list_for_each_entry_safe(rd
, nd
, &f
->remotes
, list
)
800 static void vxlan_fdb_destroy(struct vxlan_dev
*vxlan
, struct vxlan_fdb
*f
)
802 netdev_dbg(vxlan
->dev
,
803 "delete %pM\n", f
->eth_addr
);
806 vxlan_fdb_notify(vxlan
, f
, first_remote_rtnl(f
), RTM_DELNEIGH
);
808 hlist_del_rcu(&f
->hlist
);
809 call_rcu(&f
->rcu
, vxlan_fdb_free
);
812 static int vxlan_fdb_parse(struct nlattr
*tb
[], struct vxlan_dev
*vxlan
,
813 union vxlan_addr
*ip
, __be16
*port
, u32
*vni
, u32
*ifindex
)
815 struct net
*net
= dev_net(vxlan
->dev
);
819 err
= vxlan_nla_get_addr(ip
, tb
[NDA_DST
]);
823 union vxlan_addr
*remote
= &vxlan
->default_dst
.remote_ip
;
824 if (remote
->sa
.sa_family
== AF_INET
) {
825 ip
->sin
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
826 ip
->sa
.sa_family
= AF_INET
;
827 #if IS_ENABLED(CONFIG_IPV6)
829 ip
->sin6
.sin6_addr
= in6addr_any
;
830 ip
->sa
.sa_family
= AF_INET6
;
836 if (nla_len(tb
[NDA_PORT
]) != sizeof(__be16
))
838 *port
= nla_get_be16(tb
[NDA_PORT
]);
840 *port
= vxlan
->dst_port
;
844 if (nla_len(tb
[NDA_VNI
]) != sizeof(u32
))
846 *vni
= nla_get_u32(tb
[NDA_VNI
]);
848 *vni
= vxlan
->default_dst
.remote_vni
;
851 if (tb
[NDA_IFINDEX
]) {
852 struct net_device
*tdev
;
854 if (nla_len(tb
[NDA_IFINDEX
]) != sizeof(u32
))
856 *ifindex
= nla_get_u32(tb
[NDA_IFINDEX
]);
857 tdev
= __dev_get_by_index(net
, *ifindex
);
859 return -EADDRNOTAVAIL
;
867 /* Add static entry (via netlink) */
868 static int vxlan_fdb_add(struct ndmsg
*ndm
, struct nlattr
*tb
[],
869 struct net_device
*dev
,
870 const unsigned char *addr
, u16 vid
, u16 flags
)
872 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
873 /* struct net *net = dev_net(vxlan->dev); */
879 if (!(ndm
->ndm_state
& (NUD_PERMANENT
|NUD_REACHABLE
))) {
880 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
885 if (tb
[NDA_DST
] == NULL
)
888 err
= vxlan_fdb_parse(tb
, vxlan
, &ip
, &port
, &vni
, &ifindex
);
892 if (vxlan
->default_dst
.remote_ip
.sa
.sa_family
!= ip
.sa
.sa_family
)
893 return -EAFNOSUPPORT
;
895 spin_lock_bh(&vxlan
->hash_lock
);
896 err
= vxlan_fdb_create(vxlan
, addr
, &ip
, ndm
->ndm_state
, flags
,
897 port
, vni
, ifindex
, ndm
->ndm_flags
);
898 spin_unlock_bh(&vxlan
->hash_lock
);
903 /* Delete entry (via netlink) */
904 static int vxlan_fdb_delete(struct ndmsg
*ndm
, struct nlattr
*tb
[],
905 struct net_device
*dev
,
906 const unsigned char *addr
, u16 vid
)
908 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
910 struct vxlan_rdst
*rd
= NULL
;
916 err
= vxlan_fdb_parse(tb
, vxlan
, &ip
, &port
, &vni
, &ifindex
);
922 spin_lock_bh(&vxlan
->hash_lock
);
923 f
= vxlan_find_mac(vxlan
, addr
);
927 if (!vxlan_addr_any(&ip
)) {
928 rd
= vxlan_fdb_find_rdst(f
, &ip
, port
, vni
, ifindex
);
935 /* remove a destination if it's not the only one on the list,
936 * otherwise destroy the fdb entry
938 if (rd
&& !list_is_singular(&f
->remotes
)) {
939 list_del_rcu(&rd
->list
);
940 vxlan_fdb_notify(vxlan
, f
, rd
, RTM_DELNEIGH
);
945 vxlan_fdb_destroy(vxlan
, f
);
948 spin_unlock_bh(&vxlan
->hash_lock
);
953 /* Dump forwarding table */
954 static int vxlan_fdb_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
,
955 struct net_device
*dev
,
956 struct net_device
*filter_dev
, int idx
)
958 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
961 for (h
= 0; h
< FDB_HASH_SIZE
; ++h
) {
965 hlist_for_each_entry_rcu(f
, &vxlan
->fdb_head
[h
], hlist
) {
966 struct vxlan_rdst
*rd
;
968 if (idx
< cb
->args
[0])
971 list_for_each_entry_rcu(rd
, &f
->remotes
, list
) {
972 err
= vxlan_fdb_info(skb
, vxlan
, f
,
973 NETLINK_CB(cb
->skb
).portid
,
988 /* Watch incoming packets to learn mapping between Ethernet address
989 * and Tunnel endpoint.
990 * Return true if packet is bogus and should be droppped.
992 static bool vxlan_snoop(struct net_device
*dev
,
993 union vxlan_addr
*src_ip
, const u8
*src_mac
)
995 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
998 f
= vxlan_find_mac(vxlan
, src_mac
);
1000 struct vxlan_rdst
*rdst
= first_remote_rcu(f
);
1002 if (likely(vxlan_addr_equal(&rdst
->remote_ip
, src_ip
)))
1005 /* Don't migrate static entries, drop packets */
1006 if (f
->state
& NUD_NOARP
)
1009 if (net_ratelimit())
1011 "%pM migrated from %pIS to %pIS\n",
1012 src_mac
, &rdst
->remote_ip
.sa
, &src_ip
->sa
);
1014 rdst
->remote_ip
= *src_ip
;
1015 f
->updated
= jiffies
;
1016 vxlan_fdb_notify(vxlan
, f
, rdst
, RTM_NEWNEIGH
);
1018 /* learned new entry */
1019 spin_lock(&vxlan
->hash_lock
);
1021 /* close off race between vxlan_flush and incoming packets */
1022 if (netif_running(dev
))
1023 vxlan_fdb_create(vxlan
, src_mac
, src_ip
,
1025 NLM_F_EXCL
|NLM_F_CREATE
,
1027 vxlan
->default_dst
.remote_vni
,
1029 spin_unlock(&vxlan
->hash_lock
);
1035 /* See if multicast group is already in use by other ID */
1036 static bool vxlan_group_used(struct vxlan_net
*vn
, struct vxlan_dev
*dev
)
1038 struct vxlan_dev
*vxlan
;
1040 /* The vxlan_sock is only used by dev, leaving group has
1041 * no effect on other vxlan devices.
1043 if (atomic_read(&dev
->vn_sock
->refcnt
) == 1)
1046 list_for_each_entry(vxlan
, &vn
->vxlan_list
, next
) {
1047 if (!netif_running(vxlan
->dev
) || vxlan
== dev
)
1050 if (vxlan
->vn_sock
!= dev
->vn_sock
)
1053 if (!vxlan_addr_equal(&vxlan
->default_dst
.remote_ip
,
1054 &dev
->default_dst
.remote_ip
))
1057 if (vxlan
->default_dst
.remote_ifindex
!=
1058 dev
->default_dst
.remote_ifindex
)
1067 static void vxlan_sock_hold(struct vxlan_sock
*vs
)
1069 atomic_inc(&vs
->refcnt
);
1072 void vxlan_sock_release(struct vxlan_sock
*vs
)
1074 struct sock
*sk
= vs
->sock
->sk
;
1075 struct net
*net
= sock_net(sk
);
1076 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
1078 if (!atomic_dec_and_test(&vs
->refcnt
))
1081 spin_lock(&vn
->sock_lock
);
1082 hlist_del_rcu(&vs
->hlist
);
1083 vxlan_notify_del_rx_port(vs
);
1084 spin_unlock(&vn
->sock_lock
);
1086 queue_work(vxlan_wq
, &vs
->del_work
);
1088 EXPORT_SYMBOL_GPL(vxlan_sock_release
);
1090 /* Callback to update multicast group membership when first VNI on
1091 * multicast asddress is brought up
1092 * Done as workqueue because ip_mc_join_group acquires RTNL.
1094 static void vxlan_igmp_join(struct work_struct
*work
)
1096 struct vxlan_dev
*vxlan
= container_of(work
, struct vxlan_dev
, igmp_join
);
1097 struct vxlan_sock
*vs
= vxlan
->vn_sock
;
1098 struct sock
*sk
= vs
->sock
->sk
;
1099 union vxlan_addr
*ip
= &vxlan
->default_dst
.remote_ip
;
1100 int ifindex
= vxlan
->default_dst
.remote_ifindex
;
1103 if (ip
->sa
.sa_family
== AF_INET
) {
1104 struct ip_mreqn mreq
= {
1105 .imr_multiaddr
.s_addr
= ip
->sin
.sin_addr
.s_addr
,
1106 .imr_ifindex
= ifindex
,
1109 ip_mc_join_group(sk
, &mreq
);
1110 #if IS_ENABLED(CONFIG_IPV6)
1112 ipv6_stub
->ipv6_sock_mc_join(sk
, ifindex
,
1113 &ip
->sin6
.sin6_addr
);
1118 vxlan_sock_release(vs
);
1119 dev_put(vxlan
->dev
);
1122 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1123 static void vxlan_igmp_leave(struct work_struct
*work
)
1125 struct vxlan_dev
*vxlan
= container_of(work
, struct vxlan_dev
, igmp_leave
);
1126 struct vxlan_sock
*vs
= vxlan
->vn_sock
;
1127 struct sock
*sk
= vs
->sock
->sk
;
1128 union vxlan_addr
*ip
= &vxlan
->default_dst
.remote_ip
;
1129 int ifindex
= vxlan
->default_dst
.remote_ifindex
;
1132 if (ip
->sa
.sa_family
== AF_INET
) {
1133 struct ip_mreqn mreq
= {
1134 .imr_multiaddr
.s_addr
= ip
->sin
.sin_addr
.s_addr
,
1135 .imr_ifindex
= ifindex
,
1138 ip_mc_leave_group(sk
, &mreq
);
1139 #if IS_ENABLED(CONFIG_IPV6)
1141 ipv6_stub
->ipv6_sock_mc_drop(sk
, ifindex
,
1142 &ip
->sin6
.sin6_addr
);
1148 vxlan_sock_release(vs
);
1149 dev_put(vxlan
->dev
);
1152 static struct vxlanhdr
*vxlan_remcsum(struct sk_buff
*skb
, struct vxlanhdr
*vh
,
1153 size_t hdrlen
, u32 data
)
1155 size_t start
, offset
, plen
;
1157 if (skb
->remcsum_offload
) {
1158 /* Already processed in GRO path */
1159 skb
->remcsum_offload
= 0;
1163 start
= (data
& VXLAN_RCO_MASK
) << VXLAN_RCO_SHIFT
;
1164 offset
= start
+ ((data
& VXLAN_RCO_UDP
) ?
1165 offsetof(struct udphdr
, check
) :
1166 offsetof(struct tcphdr
, check
));
1168 plen
= hdrlen
+ offset
+ sizeof(u16
);
1170 if (!pskb_may_pull(skb
, plen
))
1173 vh
= (struct vxlanhdr
*)(udp_hdr(skb
) + 1);
1175 skb_remcsum_process(skb
, (void *)vh
+ hdrlen
, start
, offset
);
1180 /* Callback from net/ipv4/udp.c to receive packets */
1181 static int vxlan_udp_encap_recv(struct sock
*sk
, struct sk_buff
*skb
)
1183 struct vxlan_sock
*vs
;
1184 struct vxlanhdr
*vxh
;
1186 struct vxlan_metadata md
= {0};
1188 /* Need Vxlan and inner Ethernet header to be present */
1189 if (!pskb_may_pull(skb
, VXLAN_HLEN
))
1192 vxh
= (struct vxlanhdr
*)(udp_hdr(skb
) + 1);
1193 flags
= ntohl(vxh
->vx_flags
);
1194 vni
= ntohl(vxh
->vx_vni
);
1196 if (flags
& VXLAN_HF_VNI
) {
1197 flags
&= ~VXLAN_HF_VNI
;
1199 /* VNI flag always required to be set */
1203 if (iptunnel_pull_header(skb
, VXLAN_HLEN
, htons(ETH_P_TEB
)))
1205 vxh
= (struct vxlanhdr
*)(udp_hdr(skb
) + 1);
1207 vs
= rcu_dereference_sk_user_data(sk
);
1211 if ((flags
& VXLAN_HF_RCO
) && (vs
->flags
& VXLAN_F_REMCSUM_RX
)) {
1212 vxh
= vxlan_remcsum(skb
, vxh
, sizeof(struct vxlanhdr
), vni
);
1216 flags
&= ~VXLAN_HF_RCO
;
1217 vni
&= VXLAN_VID_MASK
;
1220 /* For backwards compatibility, only allow reserved fields to be
1221 * used by VXLAN extensions if explicitly requested.
1223 if ((flags
& VXLAN_HF_GBP
) && (vs
->flags
& VXLAN_F_GBP
)) {
1224 struct vxlanhdr_gbp
*gbp
;
1226 gbp
= (struct vxlanhdr_gbp
*)vxh
;
1227 md
.gbp
= ntohs(gbp
->policy_id
);
1229 if (gbp
->dont_learn
)
1230 md
.gbp
|= VXLAN_GBP_DONT_LEARN
;
1232 if (gbp
->policy_applied
)
1233 md
.gbp
|= VXLAN_GBP_POLICY_APPLIED
;
1235 flags
&= ~VXLAN_GBP_USED_BITS
;
1238 if (flags
|| (vni
& ~VXLAN_VID_MASK
)) {
1239 /* If there are any unprocessed flags remaining treat
1240 * this as a malformed packet. This behavior diverges from
1241 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1242 * in reserved fields are to be ignored. The approach here
1243 * maintains compatbility with previous stack code, and also
1244 * is more robust and provides a little more security in
1245 * adding extensions to VXLAN.
1251 md
.vni
= vxh
->vx_vni
;
1252 vs
->rcv(vs
, skb
, &md
);
1256 /* Consume bad packet */
1261 netdev_dbg(skb
->dev
, "invalid vxlan flags=%#x vni=%#x\n",
1262 ntohl(vxh
->vx_flags
), ntohl(vxh
->vx_vni
));
1265 /* Return non vxlan pkt */
1269 static void vxlan_rcv(struct vxlan_sock
*vs
, struct sk_buff
*skb
,
1270 struct vxlan_metadata
*md
)
1272 struct iphdr
*oip
= NULL
;
1273 struct ipv6hdr
*oip6
= NULL
;
1274 struct vxlan_dev
*vxlan
;
1275 struct pcpu_sw_netstats
*stats
;
1276 union vxlan_addr saddr
;
1279 union vxlan_addr
*remote_ip
;
1281 vni
= ntohl(md
->vni
) >> 8;
1282 /* Is this VNI defined? */
1283 vxlan
= vxlan_vs_find_vni(vs
, vni
);
1287 remote_ip
= &vxlan
->default_dst
.remote_ip
;
1288 skb_reset_mac_header(skb
);
1289 skb_scrub_packet(skb
, !net_eq(vxlan
->net
, dev_net(vxlan
->dev
)));
1290 skb
->protocol
= eth_type_trans(skb
, vxlan
->dev
);
1291 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
1293 /* Ignore packet loops (and multicast echo) */
1294 if (ether_addr_equal(eth_hdr(skb
)->h_source
, vxlan
->dev
->dev_addr
))
1297 /* Re-examine inner Ethernet packet */
1298 if (remote_ip
->sa
.sa_family
== AF_INET
) {
1300 saddr
.sin
.sin_addr
.s_addr
= oip
->saddr
;
1301 saddr
.sa
.sa_family
= AF_INET
;
1302 #if IS_ENABLED(CONFIG_IPV6)
1304 oip6
= ipv6_hdr(skb
);
1305 saddr
.sin6
.sin6_addr
= oip6
->saddr
;
1306 saddr
.sa
.sa_family
= AF_INET6
;
1310 if ((vxlan
->flags
& VXLAN_F_LEARN
) &&
1311 vxlan_snoop(skb
->dev
, &saddr
, eth_hdr(skb
)->h_source
))
1314 skb_reset_network_header(skb
);
1315 skb
->mark
= md
->gbp
;
1318 err
= IP6_ECN_decapsulate(oip6
, skb
);
1320 err
= IP_ECN_decapsulate(oip
, skb
);
1322 if (unlikely(err
)) {
1323 if (log_ecn_error
) {
1325 net_info_ratelimited("non-ECT from %pI6\n",
1328 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1329 &oip
->saddr
, oip
->tos
);
1332 ++vxlan
->dev
->stats
.rx_frame_errors
;
1333 ++vxlan
->dev
->stats
.rx_errors
;
1338 stats
= this_cpu_ptr(vxlan
->dev
->tstats
);
1339 u64_stats_update_begin(&stats
->syncp
);
1340 stats
->rx_packets
++;
1341 stats
->rx_bytes
+= skb
->len
;
1342 u64_stats_update_end(&stats
->syncp
);
1348 /* Consume bad packet */
1352 static int arp_reduce(struct net_device
*dev
, struct sk_buff
*skb
)
1354 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1355 struct arphdr
*parp
;
1358 struct neighbour
*n
;
1360 if (dev
->flags
& IFF_NOARP
)
1363 if (!pskb_may_pull(skb
, arp_hdr_len(dev
))) {
1364 dev
->stats
.tx_dropped
++;
1367 parp
= arp_hdr(skb
);
1369 if ((parp
->ar_hrd
!= htons(ARPHRD_ETHER
) &&
1370 parp
->ar_hrd
!= htons(ARPHRD_IEEE802
)) ||
1371 parp
->ar_pro
!= htons(ETH_P_IP
) ||
1372 parp
->ar_op
!= htons(ARPOP_REQUEST
) ||
1373 parp
->ar_hln
!= dev
->addr_len
||
1376 arpptr
= (u8
*)parp
+ sizeof(struct arphdr
);
1378 arpptr
+= dev
->addr_len
; /* sha */
1379 memcpy(&sip
, arpptr
, sizeof(sip
));
1380 arpptr
+= sizeof(sip
);
1381 arpptr
+= dev
->addr_len
; /* tha */
1382 memcpy(&tip
, arpptr
, sizeof(tip
));
1384 if (ipv4_is_loopback(tip
) ||
1385 ipv4_is_multicast(tip
))
1388 n
= neigh_lookup(&arp_tbl
, &tip
, dev
);
1391 struct vxlan_fdb
*f
;
1392 struct sk_buff
*reply
;
1394 if (!(n
->nud_state
& NUD_CONNECTED
)) {
1399 f
= vxlan_find_mac(vxlan
, n
->ha
);
1400 if (f
&& vxlan_addr_any(&(first_remote_rcu(f
)->remote_ip
))) {
1401 /* bridge-local neighbor */
1406 reply
= arp_create(ARPOP_REPLY
, ETH_P_ARP
, sip
, dev
, tip
, sha
,
1414 skb_reset_mac_header(reply
);
1415 __skb_pull(reply
, skb_network_offset(reply
));
1416 reply
->ip_summed
= CHECKSUM_UNNECESSARY
;
1417 reply
->pkt_type
= PACKET_HOST
;
1419 if (netif_rx_ni(reply
) == NET_RX_DROP
)
1420 dev
->stats
.rx_dropped
++;
1421 } else if (vxlan
->flags
& VXLAN_F_L3MISS
) {
1422 union vxlan_addr ipa
= {
1423 .sin
.sin_addr
.s_addr
= tip
,
1424 .sin
.sin_family
= AF_INET
,
1427 vxlan_ip_miss(dev
, &ipa
);
1431 return NETDEV_TX_OK
;
1434 #if IS_ENABLED(CONFIG_IPV6)
1435 static struct sk_buff
*vxlan_na_create(struct sk_buff
*request
,
1436 struct neighbour
*n
, bool isrouter
)
1438 struct net_device
*dev
= request
->dev
;
1439 struct sk_buff
*reply
;
1440 struct nd_msg
*ns
, *na
;
1441 struct ipv6hdr
*pip6
;
1443 int na_olen
= 8; /* opt hdr + ETH_ALEN for target */
1450 len
= LL_RESERVED_SPACE(dev
) + sizeof(struct ipv6hdr
) +
1451 sizeof(*na
) + na_olen
+ dev
->needed_tailroom
;
1452 reply
= alloc_skb(len
, GFP_ATOMIC
);
1456 reply
->protocol
= htons(ETH_P_IPV6
);
1458 skb_reserve(reply
, LL_RESERVED_SPACE(request
->dev
));
1459 skb_push(reply
, sizeof(struct ethhdr
));
1460 skb_set_mac_header(reply
, 0);
1462 ns
= (struct nd_msg
*)skb_transport_header(request
);
1464 daddr
= eth_hdr(request
)->h_source
;
1465 ns_olen
= request
->len
- skb_transport_offset(request
) - sizeof(*ns
);
1466 for (i
= 0; i
< ns_olen
-1; i
+= (ns
->opt
[i
+1]<<3)) {
1467 if (ns
->opt
[i
] == ND_OPT_SOURCE_LL_ADDR
) {
1468 daddr
= ns
->opt
+ i
+ sizeof(struct nd_opt_hdr
);
1473 /* Ethernet header */
1474 ether_addr_copy(eth_hdr(reply
)->h_dest
, daddr
);
1475 ether_addr_copy(eth_hdr(reply
)->h_source
, n
->ha
);
1476 eth_hdr(reply
)->h_proto
= htons(ETH_P_IPV6
);
1477 reply
->protocol
= htons(ETH_P_IPV6
);
1479 skb_pull(reply
, sizeof(struct ethhdr
));
1480 skb_set_network_header(reply
, 0);
1481 skb_put(reply
, sizeof(struct ipv6hdr
));
1485 pip6
= ipv6_hdr(reply
);
1486 memset(pip6
, 0, sizeof(struct ipv6hdr
));
1488 pip6
->priority
= ipv6_hdr(request
)->priority
;
1489 pip6
->nexthdr
= IPPROTO_ICMPV6
;
1490 pip6
->hop_limit
= 255;
1491 pip6
->daddr
= ipv6_hdr(request
)->saddr
;
1492 pip6
->saddr
= *(struct in6_addr
*)n
->primary_key
;
1494 skb_pull(reply
, sizeof(struct ipv6hdr
));
1495 skb_set_transport_header(reply
, 0);
1497 na
= (struct nd_msg
*)skb_put(reply
, sizeof(*na
) + na_olen
);
1499 /* Neighbor Advertisement */
1500 memset(na
, 0, sizeof(*na
)+na_olen
);
1501 na
->icmph
.icmp6_type
= NDISC_NEIGHBOUR_ADVERTISEMENT
;
1502 na
->icmph
.icmp6_router
= isrouter
;
1503 na
->icmph
.icmp6_override
= 1;
1504 na
->icmph
.icmp6_solicited
= 1;
1505 na
->target
= ns
->target
;
1506 ether_addr_copy(&na
->opt
[2], n
->ha
);
1507 na
->opt
[0] = ND_OPT_TARGET_LL_ADDR
;
1508 na
->opt
[1] = na_olen
>> 3;
1510 na
->icmph
.icmp6_cksum
= csum_ipv6_magic(&pip6
->saddr
,
1511 &pip6
->daddr
, sizeof(*na
)+na_olen
, IPPROTO_ICMPV6
,
1512 csum_partial(na
, sizeof(*na
)+na_olen
, 0));
1514 pip6
->payload_len
= htons(sizeof(*na
)+na_olen
);
1516 skb_push(reply
, sizeof(struct ipv6hdr
));
1518 reply
->ip_summed
= CHECKSUM_UNNECESSARY
;
1523 static int neigh_reduce(struct net_device
*dev
, struct sk_buff
*skb
)
1525 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1527 const struct ipv6hdr
*iphdr
;
1528 const struct in6_addr
*saddr
, *daddr
;
1529 struct neighbour
*n
;
1530 struct inet6_dev
*in6_dev
;
1532 in6_dev
= __in6_dev_get(dev
);
1536 iphdr
= ipv6_hdr(skb
);
1537 saddr
= &iphdr
->saddr
;
1538 daddr
= &iphdr
->daddr
;
1540 msg
= (struct nd_msg
*)skb_transport_header(skb
);
1541 if (msg
->icmph
.icmp6_code
!= 0 ||
1542 msg
->icmph
.icmp6_type
!= NDISC_NEIGHBOUR_SOLICITATION
)
1545 if (ipv6_addr_loopback(daddr
) ||
1546 ipv6_addr_is_multicast(&msg
->target
))
1549 n
= neigh_lookup(ipv6_stub
->nd_tbl
, &msg
->target
, dev
);
1552 struct vxlan_fdb
*f
;
1553 struct sk_buff
*reply
;
1555 if (!(n
->nud_state
& NUD_CONNECTED
)) {
1560 f
= vxlan_find_mac(vxlan
, n
->ha
);
1561 if (f
&& vxlan_addr_any(&(first_remote_rcu(f
)->remote_ip
))) {
1562 /* bridge-local neighbor */
1567 reply
= vxlan_na_create(skb
, n
,
1568 !!(f
? f
->flags
& NTF_ROUTER
: 0));
1575 if (netif_rx_ni(reply
) == NET_RX_DROP
)
1576 dev
->stats
.rx_dropped
++;
1578 } else if (vxlan
->flags
& VXLAN_F_L3MISS
) {
1579 union vxlan_addr ipa
= {
1580 .sin6
.sin6_addr
= msg
->target
,
1581 .sin6
.sin6_family
= AF_INET6
,
1584 vxlan_ip_miss(dev
, &ipa
);
1589 return NETDEV_TX_OK
;
1593 static bool route_shortcircuit(struct net_device
*dev
, struct sk_buff
*skb
)
1595 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1596 struct neighbour
*n
;
1598 if (is_multicast_ether_addr(eth_hdr(skb
)->h_dest
))
1602 switch (ntohs(eth_hdr(skb
)->h_proto
)) {
1607 if (!pskb_may_pull(skb
, sizeof(struct iphdr
)))
1610 n
= neigh_lookup(&arp_tbl
, &pip
->daddr
, dev
);
1611 if (!n
&& (vxlan
->flags
& VXLAN_F_L3MISS
)) {
1612 union vxlan_addr ipa
= {
1613 .sin
.sin_addr
.s_addr
= pip
->daddr
,
1614 .sin
.sin_family
= AF_INET
,
1617 vxlan_ip_miss(dev
, &ipa
);
1623 #if IS_ENABLED(CONFIG_IPV6)
1626 struct ipv6hdr
*pip6
;
1628 if (!pskb_may_pull(skb
, sizeof(struct ipv6hdr
)))
1630 pip6
= ipv6_hdr(skb
);
1631 n
= neigh_lookup(ipv6_stub
->nd_tbl
, &pip6
->daddr
, dev
);
1632 if (!n
&& (vxlan
->flags
& VXLAN_F_L3MISS
)) {
1633 union vxlan_addr ipa
= {
1634 .sin6
.sin6_addr
= pip6
->daddr
,
1635 .sin6
.sin6_family
= AF_INET6
,
1638 vxlan_ip_miss(dev
, &ipa
);
1652 diff
= !ether_addr_equal(eth_hdr(skb
)->h_dest
, n
->ha
);
1654 memcpy(eth_hdr(skb
)->h_source
, eth_hdr(skb
)->h_dest
,
1656 memcpy(eth_hdr(skb
)->h_dest
, n
->ha
, dev
->addr_len
);
1665 static void vxlan_build_gbp_hdr(struct vxlanhdr
*vxh
, u32 vxflags
,
1666 struct vxlan_metadata
*md
)
1668 struct vxlanhdr_gbp
*gbp
;
1673 gbp
= (struct vxlanhdr_gbp
*)vxh
;
1674 vxh
->vx_flags
|= htonl(VXLAN_HF_GBP
);
1676 if (md
->gbp
& VXLAN_GBP_DONT_LEARN
)
1677 gbp
->dont_learn
= 1;
1679 if (md
->gbp
& VXLAN_GBP_POLICY_APPLIED
)
1680 gbp
->policy_applied
= 1;
1682 gbp
->policy_id
= htons(md
->gbp
& VXLAN_GBP_ID_MASK
);
1685 #if IS_ENABLED(CONFIG_IPV6)
1686 static int vxlan6_xmit_skb(struct dst_entry
*dst
, struct sk_buff
*skb
,
1687 struct net_device
*dev
, struct in6_addr
*saddr
,
1688 struct in6_addr
*daddr
, __u8 prio
, __u8 ttl
,
1689 __be16 src_port
, __be16 dst_port
,
1690 struct vxlan_metadata
*md
, bool xnet
, u32 vxflags
)
1692 struct vxlanhdr
*vxh
;
1695 bool udp_sum
= !(vxflags
& VXLAN_F_UDP_ZERO_CSUM6_TX
);
1696 int type
= udp_sum
? SKB_GSO_UDP_TUNNEL_CSUM
: SKB_GSO_UDP_TUNNEL
;
1697 u16 hdrlen
= sizeof(struct vxlanhdr
);
1699 if ((vxflags
& VXLAN_F_REMCSUM_TX
) &&
1700 skb
->ip_summed
== CHECKSUM_PARTIAL
) {
1701 int csum_start
= skb_checksum_start_offset(skb
);
1703 if (csum_start
<= VXLAN_MAX_REMCSUM_START
&&
1704 !(csum_start
& VXLAN_RCO_SHIFT_MASK
) &&
1705 (skb
->csum_offset
== offsetof(struct udphdr
, check
) ||
1706 skb
->csum_offset
== offsetof(struct tcphdr
, check
))) {
1708 type
|= SKB_GSO_TUNNEL_REMCSUM
;
1712 skb
= iptunnel_handle_offloads(skb
, udp_sum
, type
);
1718 skb_scrub_packet(skb
, xnet
);
1720 min_headroom
= LL_RESERVED_SPACE(dst
->dev
) + dst
->header_len
1721 + VXLAN_HLEN
+ sizeof(struct ipv6hdr
)
1722 + (skb_vlan_tag_present(skb
) ? VLAN_HLEN
: 0);
1724 /* Need space for new headers (invalidates iph ptr) */
1725 err
= skb_cow_head(skb
, min_headroom
);
1726 if (unlikely(err
)) {
1731 skb
= vlan_hwaccel_push_inside(skb
);
1732 if (WARN_ON(!skb
)) {
1737 vxh
= (struct vxlanhdr
*) __skb_push(skb
, sizeof(*vxh
));
1738 vxh
->vx_flags
= htonl(VXLAN_HF_VNI
);
1739 vxh
->vx_vni
= md
->vni
;
1741 if (type
& SKB_GSO_TUNNEL_REMCSUM
) {
1742 u32 data
= (skb_checksum_start_offset(skb
) - hdrlen
) >>
1745 if (skb
->csum_offset
== offsetof(struct udphdr
, check
))
1746 data
|= VXLAN_RCO_UDP
;
1748 vxh
->vx_vni
|= htonl(data
);
1749 vxh
->vx_flags
|= htonl(VXLAN_HF_RCO
);
1751 if (!skb_is_gso(skb
)) {
1752 skb
->ip_summed
= CHECKSUM_NONE
;
1753 skb
->encapsulation
= 0;
1757 if (vxflags
& VXLAN_F_GBP
)
1758 vxlan_build_gbp_hdr(vxh
, vxflags
, md
);
1760 skb_set_inner_protocol(skb
, htons(ETH_P_TEB
));
1762 udp_tunnel6_xmit_skb(dst
, skb
, dev
, saddr
, daddr
, prio
,
1763 ttl
, src_port
, dst_port
,
1764 !!(vxflags
& VXLAN_F_UDP_ZERO_CSUM6_TX
));
1772 int vxlan_xmit_skb(struct rtable
*rt
, struct sk_buff
*skb
,
1773 __be32 src
, __be32 dst
, __u8 tos
, __u8 ttl
, __be16 df
,
1774 __be16 src_port
, __be16 dst_port
,
1775 struct vxlan_metadata
*md
, bool xnet
, u32 vxflags
)
1777 struct vxlanhdr
*vxh
;
1780 bool udp_sum
= !!(vxflags
& VXLAN_F_UDP_CSUM
);
1781 int type
= udp_sum
? SKB_GSO_UDP_TUNNEL_CSUM
: SKB_GSO_UDP_TUNNEL
;
1782 u16 hdrlen
= sizeof(struct vxlanhdr
);
1784 if ((vxflags
& VXLAN_F_REMCSUM_TX
) &&
1785 skb
->ip_summed
== CHECKSUM_PARTIAL
) {
1786 int csum_start
= skb_checksum_start_offset(skb
);
1788 if (csum_start
<= VXLAN_MAX_REMCSUM_START
&&
1789 !(csum_start
& VXLAN_RCO_SHIFT_MASK
) &&
1790 (skb
->csum_offset
== offsetof(struct udphdr
, check
) ||
1791 skb
->csum_offset
== offsetof(struct tcphdr
, check
))) {
1793 type
|= SKB_GSO_TUNNEL_REMCSUM
;
1797 skb
= iptunnel_handle_offloads(skb
, udp_sum
, type
);
1799 return PTR_ERR(skb
);
1801 min_headroom
= LL_RESERVED_SPACE(rt
->dst
.dev
) + rt
->dst
.header_len
1802 + VXLAN_HLEN
+ sizeof(struct iphdr
)
1803 + (skb_vlan_tag_present(skb
) ? VLAN_HLEN
: 0);
1805 /* Need space for new headers (invalidates iph ptr) */
1806 err
= skb_cow_head(skb
, min_headroom
);
1807 if (unlikely(err
)) {
1812 skb
= vlan_hwaccel_push_inside(skb
);
1816 vxh
= (struct vxlanhdr
*) __skb_push(skb
, sizeof(*vxh
));
1817 vxh
->vx_flags
= htonl(VXLAN_HF_VNI
);
1818 vxh
->vx_vni
= md
->vni
;
1820 if (type
& SKB_GSO_TUNNEL_REMCSUM
) {
1821 u32 data
= (skb_checksum_start_offset(skb
) - hdrlen
) >>
1824 if (skb
->csum_offset
== offsetof(struct udphdr
, check
))
1825 data
|= VXLAN_RCO_UDP
;
1827 vxh
->vx_vni
|= htonl(data
);
1828 vxh
->vx_flags
|= htonl(VXLAN_HF_RCO
);
1830 if (!skb_is_gso(skb
)) {
1831 skb
->ip_summed
= CHECKSUM_NONE
;
1832 skb
->encapsulation
= 0;
1836 if (vxflags
& VXLAN_F_GBP
)
1837 vxlan_build_gbp_hdr(vxh
, vxflags
, md
);
1839 skb_set_inner_protocol(skb
, htons(ETH_P_TEB
));
1841 return udp_tunnel_xmit_skb(rt
, skb
, src
, dst
, tos
,
1842 ttl
, df
, src_port
, dst_port
, xnet
,
1843 !(vxflags
& VXLAN_F_UDP_CSUM
));
1845 EXPORT_SYMBOL_GPL(vxlan_xmit_skb
);
1847 /* Bypass encapsulation if the destination is local */
1848 static void vxlan_encap_bypass(struct sk_buff
*skb
, struct vxlan_dev
*src_vxlan
,
1849 struct vxlan_dev
*dst_vxlan
)
1851 struct pcpu_sw_netstats
*tx_stats
, *rx_stats
;
1852 union vxlan_addr loopback
;
1853 union vxlan_addr
*remote_ip
= &dst_vxlan
->default_dst
.remote_ip
;
1854 struct net_device
*dev
= skb
->dev
;
1857 tx_stats
= this_cpu_ptr(src_vxlan
->dev
->tstats
);
1858 rx_stats
= this_cpu_ptr(dst_vxlan
->dev
->tstats
);
1859 skb
->pkt_type
= PACKET_HOST
;
1860 skb
->encapsulation
= 0;
1861 skb
->dev
= dst_vxlan
->dev
;
1862 __skb_pull(skb
, skb_network_offset(skb
));
1864 if (remote_ip
->sa
.sa_family
== AF_INET
) {
1865 loopback
.sin
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
1866 loopback
.sa
.sa_family
= AF_INET
;
1867 #if IS_ENABLED(CONFIG_IPV6)
1869 loopback
.sin6
.sin6_addr
= in6addr_loopback
;
1870 loopback
.sa
.sa_family
= AF_INET6
;
1874 if (dst_vxlan
->flags
& VXLAN_F_LEARN
)
1875 vxlan_snoop(skb
->dev
, &loopback
, eth_hdr(skb
)->h_source
);
1877 u64_stats_update_begin(&tx_stats
->syncp
);
1878 tx_stats
->tx_packets
++;
1879 tx_stats
->tx_bytes
+= len
;
1880 u64_stats_update_end(&tx_stats
->syncp
);
1882 if (netif_rx(skb
) == NET_RX_SUCCESS
) {
1883 u64_stats_update_begin(&rx_stats
->syncp
);
1884 rx_stats
->rx_packets
++;
1885 rx_stats
->rx_bytes
+= len
;
1886 u64_stats_update_end(&rx_stats
->syncp
);
1888 dev
->stats
.rx_dropped
++;
1892 static void vxlan_xmit_one(struct sk_buff
*skb
, struct net_device
*dev
,
1893 struct vxlan_rdst
*rdst
, bool did_rsc
)
1895 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
1896 struct rtable
*rt
= NULL
;
1897 const struct iphdr
*old_iph
;
1899 union vxlan_addr
*dst
;
1900 struct vxlan_metadata md
;
1901 __be16 src_port
= 0, dst_port
;
1907 dst_port
= rdst
->remote_port
? rdst
->remote_port
: vxlan
->dst_port
;
1908 vni
= rdst
->remote_vni
;
1909 dst
= &rdst
->remote_ip
;
1911 if (vxlan_addr_any(dst
)) {
1913 /* short-circuited back to local bridge */
1914 vxlan_encap_bypass(skb
, vxlan
, vxlan
);
1920 old_iph
= ip_hdr(skb
);
1923 if (!ttl
&& vxlan_addr_multicast(dst
))
1928 tos
= ip_tunnel_get_dsfield(old_iph
, skb
);
1930 src_port
= udp_flow_src_port(dev_net(dev
), skb
, vxlan
->port_min
,
1931 vxlan
->port_max
, true);
1933 if (dst
->sa
.sa_family
== AF_INET
) {
1934 memset(&fl4
, 0, sizeof(fl4
));
1935 fl4
.flowi4_oif
= rdst
->remote_ifindex
;
1936 fl4
.flowi4_tos
= RT_TOS(tos
);
1937 fl4
.daddr
= dst
->sin
.sin_addr
.s_addr
;
1938 fl4
.saddr
= vxlan
->saddr
.sin
.sin_addr
.s_addr
;
1940 rt
= ip_route_output_key(vxlan
->net
, &fl4
);
1942 netdev_dbg(dev
, "no route to %pI4\n",
1943 &dst
->sin
.sin_addr
.s_addr
);
1944 dev
->stats
.tx_carrier_errors
++;
1948 if (rt
->dst
.dev
== dev
) {
1949 netdev_dbg(dev
, "circular route to %pI4\n",
1950 &dst
->sin
.sin_addr
.s_addr
);
1951 dev
->stats
.collisions
++;
1955 /* Bypass encapsulation if the destination is local */
1956 if (rt
->rt_flags
& RTCF_LOCAL
&&
1957 !(rt
->rt_flags
& (RTCF_BROADCAST
| RTCF_MULTICAST
))) {
1958 struct vxlan_dev
*dst_vxlan
;
1961 dst_vxlan
= vxlan_find_vni(vxlan
->net
, vni
,
1962 dst
->sa
.sa_family
, dst_port
,
1966 vxlan_encap_bypass(skb
, vxlan
, dst_vxlan
);
1970 tos
= ip_tunnel_ecn_encap(tos
, old_iph
, skb
);
1971 ttl
= ttl
? : ip4_dst_hoplimit(&rt
->dst
);
1972 md
.vni
= htonl(vni
<< 8);
1975 err
= vxlan_xmit_skb(rt
, skb
, fl4
.saddr
,
1976 dst
->sin
.sin_addr
.s_addr
, tos
, ttl
, df
,
1977 src_port
, dst_port
, &md
,
1978 !net_eq(vxlan
->net
, dev_net(vxlan
->dev
)),
1981 /* skb is already freed. */
1986 iptunnel_xmit_stats(err
, &dev
->stats
, dev
->tstats
);
1987 #if IS_ENABLED(CONFIG_IPV6)
1989 struct sock
*sk
= vxlan
->vn_sock
->sock
->sk
;
1990 struct dst_entry
*ndst
;
1994 memset(&fl6
, 0, sizeof(fl6
));
1995 fl6
.flowi6_oif
= rdst
->remote_ifindex
;
1996 fl6
.daddr
= dst
->sin6
.sin6_addr
;
1997 fl6
.saddr
= vxlan
->saddr
.sin6
.sin6_addr
;
1998 fl6
.flowi6_proto
= IPPROTO_UDP
;
2000 if (ipv6_stub
->ipv6_dst_lookup(sk
, &ndst
, &fl6
)) {
2001 netdev_dbg(dev
, "no route to %pI6\n",
2002 &dst
->sin6
.sin6_addr
);
2003 dev
->stats
.tx_carrier_errors
++;
2007 if (ndst
->dev
== dev
) {
2008 netdev_dbg(dev
, "circular route to %pI6\n",
2009 &dst
->sin6
.sin6_addr
);
2011 dev
->stats
.collisions
++;
2015 /* Bypass encapsulation if the destination is local */
2016 flags
= ((struct rt6_info
*)ndst
)->rt6i_flags
;
2017 if (flags
& RTF_LOCAL
&&
2018 !(flags
& (RTCF_BROADCAST
| RTCF_MULTICAST
))) {
2019 struct vxlan_dev
*dst_vxlan
;
2022 dst_vxlan
= vxlan_find_vni(vxlan
->net
, vni
,
2023 dst
->sa
.sa_family
, dst_port
,
2027 vxlan_encap_bypass(skb
, vxlan
, dst_vxlan
);
2031 ttl
= ttl
? : ip6_dst_hoplimit(ndst
);
2032 md
.vni
= htonl(vni
<< 8);
2035 err
= vxlan6_xmit_skb(ndst
, skb
, dev
, &fl6
.saddr
, &fl6
.daddr
,
2036 0, ttl
, src_port
, dst_port
, &md
,
2037 !net_eq(vxlan
->net
, dev_net(vxlan
->dev
)),
2045 dev
->stats
.tx_dropped
++;
2051 dev
->stats
.tx_errors
++;
2056 /* Transmit local packets over Vxlan
2058 * Outer IP header inherits ECN and DF from inner header.
2059 * Outer UDP destination is the VXLAN assigned port.
2060 * source port is based on hash of flow
2062 static netdev_tx_t
vxlan_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
2064 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
2066 bool did_rsc
= false;
2067 struct vxlan_rdst
*rdst
, *fdst
= NULL
;
2068 struct vxlan_fdb
*f
;
2070 skb_reset_mac_header(skb
);
2073 if ((vxlan
->flags
& VXLAN_F_PROXY
)) {
2074 if (ntohs(eth
->h_proto
) == ETH_P_ARP
)
2075 return arp_reduce(dev
, skb
);
2076 #if IS_ENABLED(CONFIG_IPV6)
2077 else if (ntohs(eth
->h_proto
) == ETH_P_IPV6
&&
2078 pskb_may_pull(skb
, sizeof(struct ipv6hdr
)
2079 + sizeof(struct nd_msg
)) &&
2080 ipv6_hdr(skb
)->nexthdr
== IPPROTO_ICMPV6
) {
2083 msg
= (struct nd_msg
*)skb_transport_header(skb
);
2084 if (msg
->icmph
.icmp6_code
== 0 &&
2085 msg
->icmph
.icmp6_type
== NDISC_NEIGHBOUR_SOLICITATION
)
2086 return neigh_reduce(dev
, skb
);
2092 f
= vxlan_find_mac(vxlan
, eth
->h_dest
);
2095 if (f
&& (f
->flags
& NTF_ROUTER
) && (vxlan
->flags
& VXLAN_F_RSC
) &&
2096 (ntohs(eth
->h_proto
) == ETH_P_IP
||
2097 ntohs(eth
->h_proto
) == ETH_P_IPV6
)) {
2098 did_rsc
= route_shortcircuit(dev
, skb
);
2100 f
= vxlan_find_mac(vxlan
, eth
->h_dest
);
2104 f
= vxlan_find_mac(vxlan
, all_zeros_mac
);
2106 if ((vxlan
->flags
& VXLAN_F_L2MISS
) &&
2107 !is_multicast_ether_addr(eth
->h_dest
))
2108 vxlan_fdb_miss(vxlan
, eth
->h_dest
);
2110 dev
->stats
.tx_dropped
++;
2112 return NETDEV_TX_OK
;
2116 list_for_each_entry_rcu(rdst
, &f
->remotes
, list
) {
2117 struct sk_buff
*skb1
;
2123 skb1
= skb_clone(skb
, GFP_ATOMIC
);
2125 vxlan_xmit_one(skb1
, dev
, rdst
, did_rsc
);
2129 vxlan_xmit_one(skb
, dev
, fdst
, did_rsc
);
2132 return NETDEV_TX_OK
;
2135 /* Walk the forwarding table and purge stale entries */
2136 static void vxlan_cleanup(unsigned long arg
)
2138 struct vxlan_dev
*vxlan
= (struct vxlan_dev
*) arg
;
2139 unsigned long next_timer
= jiffies
+ FDB_AGE_INTERVAL
;
2142 if (!netif_running(vxlan
->dev
))
2145 spin_lock_bh(&vxlan
->hash_lock
);
2146 for (h
= 0; h
< FDB_HASH_SIZE
; ++h
) {
2147 struct hlist_node
*p
, *n
;
2148 hlist_for_each_safe(p
, n
, &vxlan
->fdb_head
[h
]) {
2150 = container_of(p
, struct vxlan_fdb
, hlist
);
2151 unsigned long timeout
;
2153 if (f
->state
& NUD_PERMANENT
)
2156 timeout
= f
->used
+ vxlan
->age_interval
* HZ
;
2157 if (time_before_eq(timeout
, jiffies
)) {
2158 netdev_dbg(vxlan
->dev
,
2159 "garbage collect %pM\n",
2161 f
->state
= NUD_STALE
;
2162 vxlan_fdb_destroy(vxlan
, f
);
2163 } else if (time_before(timeout
, next_timer
))
2164 next_timer
= timeout
;
2167 spin_unlock_bh(&vxlan
->hash_lock
);
2169 mod_timer(&vxlan
->age_timer
, next_timer
);
2172 static void vxlan_vs_add_dev(struct vxlan_sock
*vs
, struct vxlan_dev
*vxlan
)
2174 __u32 vni
= vxlan
->default_dst
.remote_vni
;
2176 vxlan
->vn_sock
= vs
;
2177 hlist_add_head_rcu(&vxlan
->hlist
, vni_head(vs
, vni
));
2180 /* Setup stats when device is created */
2181 static int vxlan_init(struct net_device
*dev
)
2183 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
2184 struct vxlan_net
*vn
= net_generic(vxlan
->net
, vxlan_net_id
);
2185 struct vxlan_sock
*vs
;
2186 bool ipv6
= vxlan
->flags
& VXLAN_F_IPV6
;
2188 dev
->tstats
= netdev_alloc_pcpu_stats(struct pcpu_sw_netstats
);
2192 spin_lock(&vn
->sock_lock
);
2193 vs
= vxlan_find_sock(vxlan
->net
, ipv6
? AF_INET6
: AF_INET
,
2194 vxlan
->dst_port
, vxlan
->flags
);
2195 if (vs
&& atomic_add_unless(&vs
->refcnt
, 1, 0)) {
2196 /* If we have a socket with same port already, reuse it */
2197 vxlan_vs_add_dev(vs
, vxlan
);
2199 /* otherwise make new socket outside of RTNL */
2201 queue_work(vxlan_wq
, &vxlan
->sock_work
);
2203 spin_unlock(&vn
->sock_lock
);
2208 static void vxlan_fdb_delete_default(struct vxlan_dev
*vxlan
)
2210 struct vxlan_fdb
*f
;
2212 spin_lock_bh(&vxlan
->hash_lock
);
2213 f
= __vxlan_find_mac(vxlan
, all_zeros_mac
);
2215 vxlan_fdb_destroy(vxlan
, f
);
2216 spin_unlock_bh(&vxlan
->hash_lock
);
2219 static void vxlan_uninit(struct net_device
*dev
)
2221 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
2222 struct vxlan_sock
*vs
= vxlan
->vn_sock
;
2224 vxlan_fdb_delete_default(vxlan
);
2227 vxlan_sock_release(vs
);
2228 free_percpu(dev
->tstats
);
2231 /* Start ageing timer and join group when device is brought up */
2232 static int vxlan_open(struct net_device
*dev
)
2234 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
2235 struct vxlan_sock
*vs
= vxlan
->vn_sock
;
2237 /* socket hasn't been created */
2241 if (vxlan_addr_multicast(&vxlan
->default_dst
.remote_ip
)) {
2242 vxlan_sock_hold(vs
);
2244 queue_work(vxlan_wq
, &vxlan
->igmp_join
);
2247 if (vxlan
->age_interval
)
2248 mod_timer(&vxlan
->age_timer
, jiffies
+ FDB_AGE_INTERVAL
);
2253 /* Purge the forwarding table */
2254 static void vxlan_flush(struct vxlan_dev
*vxlan
)
2258 spin_lock_bh(&vxlan
->hash_lock
);
2259 for (h
= 0; h
< FDB_HASH_SIZE
; ++h
) {
2260 struct hlist_node
*p
, *n
;
2261 hlist_for_each_safe(p
, n
, &vxlan
->fdb_head
[h
]) {
2263 = container_of(p
, struct vxlan_fdb
, hlist
);
2264 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2265 if (!is_zero_ether_addr(f
->eth_addr
))
2266 vxlan_fdb_destroy(vxlan
, f
);
2269 spin_unlock_bh(&vxlan
->hash_lock
);
2272 /* Cleanup timer and forwarding table on shutdown */
2273 static int vxlan_stop(struct net_device
*dev
)
2275 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
2276 struct vxlan_net
*vn
= net_generic(vxlan
->net
, vxlan_net_id
);
2277 struct vxlan_sock
*vs
= vxlan
->vn_sock
;
2279 if (vs
&& vxlan_addr_multicast(&vxlan
->default_dst
.remote_ip
) &&
2280 !vxlan_group_used(vn
, vxlan
)) {
2281 vxlan_sock_hold(vs
);
2283 queue_work(vxlan_wq
, &vxlan
->igmp_leave
);
2286 del_timer_sync(&vxlan
->age_timer
);
2293 /* Stub, nothing needs to be done. */
2294 static void vxlan_set_multicast_list(struct net_device
*dev
)
2298 static int vxlan_change_mtu(struct net_device
*dev
, int new_mtu
)
2300 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
2301 struct vxlan_rdst
*dst
= &vxlan
->default_dst
;
2302 struct net_device
*lowerdev
;
2305 lowerdev
= __dev_get_by_index(vxlan
->net
, dst
->remote_ifindex
);
2306 if (lowerdev
== NULL
)
2307 return eth_change_mtu(dev
, new_mtu
);
2309 if (dst
->remote_ip
.sa
.sa_family
== AF_INET6
)
2310 max_mtu
= lowerdev
->mtu
- VXLAN6_HEADROOM
;
2312 max_mtu
= lowerdev
->mtu
- VXLAN_HEADROOM
;
2314 if (new_mtu
< 68 || new_mtu
> max_mtu
)
2321 static const struct net_device_ops vxlan_netdev_ops
= {
2322 .ndo_init
= vxlan_init
,
2323 .ndo_uninit
= vxlan_uninit
,
2324 .ndo_open
= vxlan_open
,
2325 .ndo_stop
= vxlan_stop
,
2326 .ndo_start_xmit
= vxlan_xmit
,
2327 .ndo_get_stats64
= ip_tunnel_get_stats64
,
2328 .ndo_set_rx_mode
= vxlan_set_multicast_list
,
2329 .ndo_change_mtu
= vxlan_change_mtu
,
2330 .ndo_validate_addr
= eth_validate_addr
,
2331 .ndo_set_mac_address
= eth_mac_addr
,
2332 .ndo_fdb_add
= vxlan_fdb_add
,
2333 .ndo_fdb_del
= vxlan_fdb_delete
,
2334 .ndo_fdb_dump
= vxlan_fdb_dump
,
2337 /* Info for udev, that this is a virtual tunnel endpoint */
2338 static struct device_type vxlan_type
= {
2342 /* Calls the ndo_add_vxlan_port of the caller in order to
2343 * supply the listening VXLAN udp ports. Callers are expected
2344 * to implement the ndo_add_vxlan_port.
2346 void vxlan_get_rx_port(struct net_device
*dev
)
2348 struct vxlan_sock
*vs
;
2349 struct net
*net
= dev_net(dev
);
2350 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
2351 sa_family_t sa_family
;
2355 spin_lock(&vn
->sock_lock
);
2356 for (i
= 0; i
< PORT_HASH_SIZE
; ++i
) {
2357 hlist_for_each_entry_rcu(vs
, &vn
->sock_list
[i
], hlist
) {
2358 port
= inet_sk(vs
->sock
->sk
)->inet_sport
;
2359 sa_family
= vs
->sock
->sk
->sk_family
;
2360 dev
->netdev_ops
->ndo_add_vxlan_port(dev
, sa_family
,
2364 spin_unlock(&vn
->sock_lock
);
2366 EXPORT_SYMBOL_GPL(vxlan_get_rx_port
);
2368 /* Initialize the device structure. */
2369 static void vxlan_setup(struct net_device
*dev
)
2371 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
2374 eth_hw_addr_random(dev
);
2376 if (vxlan
->default_dst
.remote_ip
.sa
.sa_family
== AF_INET6
)
2377 dev
->needed_headroom
= ETH_HLEN
+ VXLAN6_HEADROOM
;
2379 dev
->needed_headroom
= ETH_HLEN
+ VXLAN_HEADROOM
;
2381 dev
->netdev_ops
= &vxlan_netdev_ops
;
2382 dev
->destructor
= free_netdev
;
2383 SET_NETDEV_DEVTYPE(dev
, &vxlan_type
);
2385 dev
->tx_queue_len
= 0;
2386 dev
->features
|= NETIF_F_LLTX
;
2387 dev
->features
|= NETIF_F_SG
| NETIF_F_HW_CSUM
;
2388 dev
->features
|= NETIF_F_RXCSUM
;
2389 dev
->features
|= NETIF_F_GSO_SOFTWARE
;
2391 dev
->vlan_features
= dev
->features
;
2392 dev
->features
|= NETIF_F_HW_VLAN_CTAG_TX
| NETIF_F_HW_VLAN_STAG_TX
;
2393 dev
->hw_features
|= NETIF_F_SG
| NETIF_F_HW_CSUM
| NETIF_F_RXCSUM
;
2394 dev
->hw_features
|= NETIF_F_GSO_SOFTWARE
;
2395 dev
->hw_features
|= NETIF_F_HW_VLAN_CTAG_TX
| NETIF_F_HW_VLAN_STAG_TX
;
2396 netif_keep_dst(dev
);
2397 dev
->priv_flags
|= IFF_LIVE_ADDR_CHANGE
;
2399 INIT_LIST_HEAD(&vxlan
->next
);
2400 spin_lock_init(&vxlan
->hash_lock
);
2401 INIT_WORK(&vxlan
->igmp_join
, vxlan_igmp_join
);
2402 INIT_WORK(&vxlan
->igmp_leave
, vxlan_igmp_leave
);
2403 INIT_WORK(&vxlan
->sock_work
, vxlan_sock_work
);
2405 init_timer_deferrable(&vxlan
->age_timer
);
2406 vxlan
->age_timer
.function
= vxlan_cleanup
;
2407 vxlan
->age_timer
.data
= (unsigned long) vxlan
;
2409 vxlan
->dst_port
= htons(vxlan_port
);
2413 for (h
= 0; h
< FDB_HASH_SIZE
; ++h
)
2414 INIT_HLIST_HEAD(&vxlan
->fdb_head
[h
]);
2417 static const struct nla_policy vxlan_policy
[IFLA_VXLAN_MAX
+ 1] = {
2418 [IFLA_VXLAN_ID
] = { .type
= NLA_U32
},
2419 [IFLA_VXLAN_GROUP
] = { .len
= FIELD_SIZEOF(struct iphdr
, daddr
) },
2420 [IFLA_VXLAN_GROUP6
] = { .len
= sizeof(struct in6_addr
) },
2421 [IFLA_VXLAN_LINK
] = { .type
= NLA_U32
},
2422 [IFLA_VXLAN_LOCAL
] = { .len
= FIELD_SIZEOF(struct iphdr
, saddr
) },
2423 [IFLA_VXLAN_LOCAL6
] = { .len
= sizeof(struct in6_addr
) },
2424 [IFLA_VXLAN_TOS
] = { .type
= NLA_U8
},
2425 [IFLA_VXLAN_TTL
] = { .type
= NLA_U8
},
2426 [IFLA_VXLAN_LEARNING
] = { .type
= NLA_U8
},
2427 [IFLA_VXLAN_AGEING
] = { .type
= NLA_U32
},
2428 [IFLA_VXLAN_LIMIT
] = { .type
= NLA_U32
},
2429 [IFLA_VXLAN_PORT_RANGE
] = { .len
= sizeof(struct ifla_vxlan_port_range
) },
2430 [IFLA_VXLAN_PROXY
] = { .type
= NLA_U8
},
2431 [IFLA_VXLAN_RSC
] = { .type
= NLA_U8
},
2432 [IFLA_VXLAN_L2MISS
] = { .type
= NLA_U8
},
2433 [IFLA_VXLAN_L3MISS
] = { .type
= NLA_U8
},
2434 [IFLA_VXLAN_PORT
] = { .type
= NLA_U16
},
2435 [IFLA_VXLAN_UDP_CSUM
] = { .type
= NLA_U8
},
2436 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX
] = { .type
= NLA_U8
},
2437 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX
] = { .type
= NLA_U8
},
2438 [IFLA_VXLAN_REMCSUM_TX
] = { .type
= NLA_U8
},
2439 [IFLA_VXLAN_REMCSUM_RX
] = { .type
= NLA_U8
},
2440 [IFLA_VXLAN_GBP
] = { .type
= NLA_FLAG
, },
2443 static int vxlan_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
2445 if (tb
[IFLA_ADDRESS
]) {
2446 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
) {
2447 pr_debug("invalid link address (not ethernet)\n");
2451 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
]))) {
2452 pr_debug("invalid all zero ethernet address\n");
2453 return -EADDRNOTAVAIL
;
2460 if (data
[IFLA_VXLAN_ID
]) {
2461 __u32 id
= nla_get_u32(data
[IFLA_VXLAN_ID
]);
2462 if (id
>= VXLAN_VID_MASK
)
2466 if (data
[IFLA_VXLAN_PORT_RANGE
]) {
2467 const struct ifla_vxlan_port_range
*p
2468 = nla_data(data
[IFLA_VXLAN_PORT_RANGE
]);
2470 if (ntohs(p
->high
) < ntohs(p
->low
)) {
2471 pr_debug("port range %u .. %u not valid\n",
2472 ntohs(p
->low
), ntohs(p
->high
));
2480 static void vxlan_get_drvinfo(struct net_device
*netdev
,
2481 struct ethtool_drvinfo
*drvinfo
)
2483 strlcpy(drvinfo
->version
, VXLAN_VERSION
, sizeof(drvinfo
->version
));
2484 strlcpy(drvinfo
->driver
, "vxlan", sizeof(drvinfo
->driver
));
2487 static const struct ethtool_ops vxlan_ethtool_ops
= {
2488 .get_drvinfo
= vxlan_get_drvinfo
,
2489 .get_link
= ethtool_op_get_link
,
2492 static void vxlan_del_work(struct work_struct
*work
)
2494 struct vxlan_sock
*vs
= container_of(work
, struct vxlan_sock
, del_work
);
2495 udp_tunnel_sock_release(vs
->sock
);
2499 static struct socket
*vxlan_create_sock(struct net
*net
, bool ipv6
,
2500 __be16 port
, u32 flags
)
2502 struct socket
*sock
;
2503 struct udp_port_cfg udp_conf
;
2506 memset(&udp_conf
, 0, sizeof(udp_conf
));
2509 udp_conf
.family
= AF_INET6
;
2510 udp_conf
.use_udp6_rx_checksums
=
2511 !(flags
& VXLAN_F_UDP_ZERO_CSUM6_RX
);
2513 udp_conf
.family
= AF_INET
;
2514 udp_conf
.local_ip
.s_addr
= INADDR_ANY
;
2517 udp_conf
.local_udp_port
= port
;
2519 /* Open UDP socket */
2520 err
= udp_sock_create(net
, &udp_conf
, &sock
);
2522 return ERR_PTR(err
);
2527 /* Create new listen socket if needed */
2528 static struct vxlan_sock
*vxlan_socket_create(struct net
*net
, __be16 port
,
2529 vxlan_rcv_t
*rcv
, void *data
,
2532 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
2533 struct vxlan_sock
*vs
;
2534 struct socket
*sock
;
2536 bool ipv6
= !!(flags
& VXLAN_F_IPV6
);
2537 struct udp_tunnel_sock_cfg tunnel_cfg
;
2539 vs
= kzalloc(sizeof(*vs
), GFP_KERNEL
);
2541 return ERR_PTR(-ENOMEM
);
2543 for (h
= 0; h
< VNI_HASH_SIZE
; ++h
)
2544 INIT_HLIST_HEAD(&vs
->vni_list
[h
]);
2546 INIT_WORK(&vs
->del_work
, vxlan_del_work
);
2548 sock
= vxlan_create_sock(net
, ipv6
, port
, flags
);
2551 return ERR_CAST(sock
);
2555 atomic_set(&vs
->refcnt
, 1);
2558 vs
->flags
= (flags
& VXLAN_F_RCV_FLAGS
);
2560 /* Initialize the vxlan udp offloads structure */
2561 vs
->udp_offloads
.port
= port
;
2562 vs
->udp_offloads
.callbacks
.gro_receive
= vxlan_gro_receive
;
2563 vs
->udp_offloads
.callbacks
.gro_complete
= vxlan_gro_complete
;
2565 spin_lock(&vn
->sock_lock
);
2566 hlist_add_head_rcu(&vs
->hlist
, vs_head(net
, port
));
2567 vxlan_notify_add_rx_port(vs
);
2568 spin_unlock(&vn
->sock_lock
);
2570 /* Mark socket as an encapsulation socket. */
2571 tunnel_cfg
.sk_user_data
= vs
;
2572 tunnel_cfg
.encap_type
= 1;
2573 tunnel_cfg
.encap_rcv
= vxlan_udp_encap_recv
;
2574 tunnel_cfg
.encap_destroy
= NULL
;
2576 setup_udp_tunnel_sock(net
, sock
, &tunnel_cfg
);
2581 struct vxlan_sock
*vxlan_sock_add(struct net
*net
, __be16 port
,
2582 vxlan_rcv_t
*rcv
, void *data
,
2583 bool no_share
, u32 flags
)
2585 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
2586 struct vxlan_sock
*vs
;
2587 bool ipv6
= flags
& VXLAN_F_IPV6
;
2589 vs
= vxlan_socket_create(net
, port
, rcv
, data
, flags
);
2593 if (no_share
) /* Return error if sharing is not allowed. */
2596 spin_lock(&vn
->sock_lock
);
2597 vs
= vxlan_find_sock(net
, ipv6
? AF_INET6
: AF_INET
, port
, flags
);
2598 if (vs
&& ((vs
->rcv
!= rcv
) ||
2599 !atomic_add_unless(&vs
->refcnt
, 1, 0)))
2600 vs
= ERR_PTR(-EBUSY
);
2601 spin_unlock(&vn
->sock_lock
);
2604 vs
= ERR_PTR(-EINVAL
);
2608 EXPORT_SYMBOL_GPL(vxlan_sock_add
);
2610 /* Scheduled at device creation to bind to a socket */
2611 static void vxlan_sock_work(struct work_struct
*work
)
2613 struct vxlan_dev
*vxlan
= container_of(work
, struct vxlan_dev
, sock_work
);
2614 struct net
*net
= vxlan
->net
;
2615 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
2616 __be16 port
= vxlan
->dst_port
;
2617 struct vxlan_sock
*nvs
;
2619 nvs
= vxlan_sock_add(net
, port
, vxlan_rcv
, NULL
, false, vxlan
->flags
);
2620 spin_lock(&vn
->sock_lock
);
2622 vxlan_vs_add_dev(nvs
, vxlan
);
2623 spin_unlock(&vn
->sock_lock
);
2625 dev_put(vxlan
->dev
);
2628 static int vxlan_newlink(struct net
*src_net
, struct net_device
*dev
,
2629 struct nlattr
*tb
[], struct nlattr
*data
[])
2631 struct vxlan_net
*vn
= net_generic(src_net
, vxlan_net_id
);
2632 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
2633 struct vxlan_rdst
*dst
= &vxlan
->default_dst
;
2636 bool use_ipv6
= false;
2638 if (!data
[IFLA_VXLAN_ID
])
2641 vxlan
->net
= src_net
;
2643 vni
= nla_get_u32(data
[IFLA_VXLAN_ID
]);
2644 dst
->remote_vni
= vni
;
2646 /* Unless IPv6 is explicitly requested, assume IPv4 */
2647 dst
->remote_ip
.sa
.sa_family
= AF_INET
;
2648 if (data
[IFLA_VXLAN_GROUP
]) {
2649 dst
->remote_ip
.sin
.sin_addr
.s_addr
= nla_get_be32(data
[IFLA_VXLAN_GROUP
]);
2650 } else if (data
[IFLA_VXLAN_GROUP6
]) {
2651 if (!IS_ENABLED(CONFIG_IPV6
))
2652 return -EPFNOSUPPORT
;
2654 nla_memcpy(&dst
->remote_ip
.sin6
.sin6_addr
, data
[IFLA_VXLAN_GROUP6
],
2655 sizeof(struct in6_addr
));
2656 dst
->remote_ip
.sa
.sa_family
= AF_INET6
;
2660 if (data
[IFLA_VXLAN_LOCAL
]) {
2661 vxlan
->saddr
.sin
.sin_addr
.s_addr
= nla_get_be32(data
[IFLA_VXLAN_LOCAL
]);
2662 vxlan
->saddr
.sa
.sa_family
= AF_INET
;
2663 } else if (data
[IFLA_VXLAN_LOCAL6
]) {
2664 if (!IS_ENABLED(CONFIG_IPV6
))
2665 return -EPFNOSUPPORT
;
2667 /* TODO: respect scope id */
2668 nla_memcpy(&vxlan
->saddr
.sin6
.sin6_addr
, data
[IFLA_VXLAN_LOCAL6
],
2669 sizeof(struct in6_addr
));
2670 vxlan
->saddr
.sa
.sa_family
= AF_INET6
;
2674 if (data
[IFLA_VXLAN_LINK
] &&
2675 (dst
->remote_ifindex
= nla_get_u32(data
[IFLA_VXLAN_LINK
]))) {
2676 struct net_device
*lowerdev
2677 = __dev_get_by_index(src_net
, dst
->remote_ifindex
);
2680 pr_info("ifindex %d does not exist\n", dst
->remote_ifindex
);
2684 #if IS_ENABLED(CONFIG_IPV6)
2686 struct inet6_dev
*idev
= __in6_dev_get(lowerdev
);
2687 if (idev
&& idev
->cnf
.disable_ipv6
) {
2688 pr_info("IPv6 is disabled via sysctl\n");
2691 vxlan
->flags
|= VXLAN_F_IPV6
;
2696 dev
->mtu
= lowerdev
->mtu
- (use_ipv6
? VXLAN6_HEADROOM
: VXLAN_HEADROOM
);
2698 dev
->needed_headroom
= lowerdev
->hard_header_len
+
2699 (use_ipv6
? VXLAN6_HEADROOM
: VXLAN_HEADROOM
);
2700 } else if (use_ipv6
)
2701 vxlan
->flags
|= VXLAN_F_IPV6
;
2703 if (data
[IFLA_VXLAN_TOS
])
2704 vxlan
->tos
= nla_get_u8(data
[IFLA_VXLAN_TOS
]);
2706 if (data
[IFLA_VXLAN_TTL
])
2707 vxlan
->ttl
= nla_get_u8(data
[IFLA_VXLAN_TTL
]);
2709 if (!data
[IFLA_VXLAN_LEARNING
] || nla_get_u8(data
[IFLA_VXLAN_LEARNING
]))
2710 vxlan
->flags
|= VXLAN_F_LEARN
;
2712 if (data
[IFLA_VXLAN_AGEING
])
2713 vxlan
->age_interval
= nla_get_u32(data
[IFLA_VXLAN_AGEING
]);
2715 vxlan
->age_interval
= FDB_AGE_DEFAULT
;
2717 if (data
[IFLA_VXLAN_PROXY
] && nla_get_u8(data
[IFLA_VXLAN_PROXY
]))
2718 vxlan
->flags
|= VXLAN_F_PROXY
;
2720 if (data
[IFLA_VXLAN_RSC
] && nla_get_u8(data
[IFLA_VXLAN_RSC
]))
2721 vxlan
->flags
|= VXLAN_F_RSC
;
2723 if (data
[IFLA_VXLAN_L2MISS
] && nla_get_u8(data
[IFLA_VXLAN_L2MISS
]))
2724 vxlan
->flags
|= VXLAN_F_L2MISS
;
2726 if (data
[IFLA_VXLAN_L3MISS
] && nla_get_u8(data
[IFLA_VXLAN_L3MISS
]))
2727 vxlan
->flags
|= VXLAN_F_L3MISS
;
2729 if (data
[IFLA_VXLAN_LIMIT
])
2730 vxlan
->addrmax
= nla_get_u32(data
[IFLA_VXLAN_LIMIT
]);
2732 if (data
[IFLA_VXLAN_PORT_RANGE
]) {
2733 const struct ifla_vxlan_port_range
*p
2734 = nla_data(data
[IFLA_VXLAN_PORT_RANGE
]);
2735 vxlan
->port_min
= ntohs(p
->low
);
2736 vxlan
->port_max
= ntohs(p
->high
);
2739 if (data
[IFLA_VXLAN_PORT
])
2740 vxlan
->dst_port
= nla_get_be16(data
[IFLA_VXLAN_PORT
]);
2742 if (data
[IFLA_VXLAN_UDP_CSUM
] && nla_get_u8(data
[IFLA_VXLAN_UDP_CSUM
]))
2743 vxlan
->flags
|= VXLAN_F_UDP_CSUM
;
2745 if (data
[IFLA_VXLAN_UDP_ZERO_CSUM6_TX
] &&
2746 nla_get_u8(data
[IFLA_VXLAN_UDP_ZERO_CSUM6_TX
]))
2747 vxlan
->flags
|= VXLAN_F_UDP_ZERO_CSUM6_TX
;
2749 if (data
[IFLA_VXLAN_UDP_ZERO_CSUM6_RX
] &&
2750 nla_get_u8(data
[IFLA_VXLAN_UDP_ZERO_CSUM6_RX
]))
2751 vxlan
->flags
|= VXLAN_F_UDP_ZERO_CSUM6_RX
;
2753 if (data
[IFLA_VXLAN_REMCSUM_TX
] &&
2754 nla_get_u8(data
[IFLA_VXLAN_REMCSUM_TX
]))
2755 vxlan
->flags
|= VXLAN_F_REMCSUM_TX
;
2757 if (data
[IFLA_VXLAN_REMCSUM_RX
] &&
2758 nla_get_u8(data
[IFLA_VXLAN_REMCSUM_RX
]))
2759 vxlan
->flags
|= VXLAN_F_REMCSUM_RX
;
2761 if (data
[IFLA_VXLAN_GBP
])
2762 vxlan
->flags
|= VXLAN_F_GBP
;
2764 if (vxlan_find_vni(src_net
, vni
, use_ipv6
? AF_INET6
: AF_INET
,
2765 vxlan
->dst_port
, vxlan
->flags
)) {
2766 pr_info("duplicate VNI %u\n", vni
);
2770 dev
->ethtool_ops
= &vxlan_ethtool_ops
;
2772 /* create an fdb entry for a valid default destination */
2773 if (!vxlan_addr_any(&vxlan
->default_dst
.remote_ip
)) {
2774 err
= vxlan_fdb_create(vxlan
, all_zeros_mac
,
2775 &vxlan
->default_dst
.remote_ip
,
2776 NUD_REACHABLE
|NUD_PERMANENT
,
2777 NLM_F_EXCL
|NLM_F_CREATE
,
2779 vxlan
->default_dst
.remote_vni
,
2780 vxlan
->default_dst
.remote_ifindex
,
2786 err
= register_netdevice(dev
);
2788 vxlan_fdb_delete_default(vxlan
);
2792 list_add(&vxlan
->next
, &vn
->vxlan_list
);
2797 static void vxlan_dellink(struct net_device
*dev
, struct list_head
*head
)
2799 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
2800 struct vxlan_net
*vn
= net_generic(vxlan
->net
, vxlan_net_id
);
2802 spin_lock(&vn
->sock_lock
);
2803 if (!hlist_unhashed(&vxlan
->hlist
))
2804 hlist_del_rcu(&vxlan
->hlist
);
2805 spin_unlock(&vn
->sock_lock
);
2807 list_del(&vxlan
->next
);
2808 unregister_netdevice_queue(dev
, head
);
2811 static size_t vxlan_get_size(const struct net_device
*dev
)
2814 return nla_total_size(sizeof(__u32
)) + /* IFLA_VXLAN_ID */
2815 nla_total_size(sizeof(struct in6_addr
)) + /* IFLA_VXLAN_GROUP{6} */
2816 nla_total_size(sizeof(__u32
)) + /* IFLA_VXLAN_LINK */
2817 nla_total_size(sizeof(struct in6_addr
)) + /* IFLA_VXLAN_LOCAL{6} */
2818 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_TTL */
2819 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_TOS */
2820 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_LEARNING */
2821 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_PROXY */
2822 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_RSC */
2823 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_L2MISS */
2824 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_L3MISS */
2825 nla_total_size(sizeof(__u32
)) + /* IFLA_VXLAN_AGEING */
2826 nla_total_size(sizeof(__u32
)) + /* IFLA_VXLAN_LIMIT */
2827 nla_total_size(sizeof(struct ifla_vxlan_port_range
)) +
2828 nla_total_size(sizeof(__be16
)) + /* IFLA_VXLAN_PORT */
2829 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_UDP_CSUM */
2830 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2831 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2832 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_REMCSUM_TX */
2833 nla_total_size(sizeof(__u8
)) + /* IFLA_VXLAN_REMCSUM_RX */
2837 static int vxlan_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
2839 const struct vxlan_dev
*vxlan
= netdev_priv(dev
);
2840 const struct vxlan_rdst
*dst
= &vxlan
->default_dst
;
2841 struct ifla_vxlan_port_range ports
= {
2842 .low
= htons(vxlan
->port_min
),
2843 .high
= htons(vxlan
->port_max
),
2846 if (nla_put_u32(skb
, IFLA_VXLAN_ID
, dst
->remote_vni
))
2847 goto nla_put_failure
;
2849 if (!vxlan_addr_any(&dst
->remote_ip
)) {
2850 if (dst
->remote_ip
.sa
.sa_family
== AF_INET
) {
2851 if (nla_put_be32(skb
, IFLA_VXLAN_GROUP
,
2852 dst
->remote_ip
.sin
.sin_addr
.s_addr
))
2853 goto nla_put_failure
;
2854 #if IS_ENABLED(CONFIG_IPV6)
2856 if (nla_put(skb
, IFLA_VXLAN_GROUP6
, sizeof(struct in6_addr
),
2857 &dst
->remote_ip
.sin6
.sin6_addr
))
2858 goto nla_put_failure
;
2863 if (dst
->remote_ifindex
&& nla_put_u32(skb
, IFLA_VXLAN_LINK
, dst
->remote_ifindex
))
2864 goto nla_put_failure
;
2866 if (!vxlan_addr_any(&vxlan
->saddr
)) {
2867 if (vxlan
->saddr
.sa
.sa_family
== AF_INET
) {
2868 if (nla_put_be32(skb
, IFLA_VXLAN_LOCAL
,
2869 vxlan
->saddr
.sin
.sin_addr
.s_addr
))
2870 goto nla_put_failure
;
2871 #if IS_ENABLED(CONFIG_IPV6)
2873 if (nla_put(skb
, IFLA_VXLAN_LOCAL6
, sizeof(struct in6_addr
),
2874 &vxlan
->saddr
.sin6
.sin6_addr
))
2875 goto nla_put_failure
;
2880 if (nla_put_u8(skb
, IFLA_VXLAN_TTL
, vxlan
->ttl
) ||
2881 nla_put_u8(skb
, IFLA_VXLAN_TOS
, vxlan
->tos
) ||
2882 nla_put_u8(skb
, IFLA_VXLAN_LEARNING
,
2883 !!(vxlan
->flags
& VXLAN_F_LEARN
)) ||
2884 nla_put_u8(skb
, IFLA_VXLAN_PROXY
,
2885 !!(vxlan
->flags
& VXLAN_F_PROXY
)) ||
2886 nla_put_u8(skb
, IFLA_VXLAN_RSC
, !!(vxlan
->flags
& VXLAN_F_RSC
)) ||
2887 nla_put_u8(skb
, IFLA_VXLAN_L2MISS
,
2888 !!(vxlan
->flags
& VXLAN_F_L2MISS
)) ||
2889 nla_put_u8(skb
, IFLA_VXLAN_L3MISS
,
2890 !!(vxlan
->flags
& VXLAN_F_L3MISS
)) ||
2891 nla_put_u32(skb
, IFLA_VXLAN_AGEING
, vxlan
->age_interval
) ||
2892 nla_put_u32(skb
, IFLA_VXLAN_LIMIT
, vxlan
->addrmax
) ||
2893 nla_put_be16(skb
, IFLA_VXLAN_PORT
, vxlan
->dst_port
) ||
2894 nla_put_u8(skb
, IFLA_VXLAN_UDP_CSUM
,
2895 !!(vxlan
->flags
& VXLAN_F_UDP_CSUM
)) ||
2896 nla_put_u8(skb
, IFLA_VXLAN_UDP_ZERO_CSUM6_TX
,
2897 !!(vxlan
->flags
& VXLAN_F_UDP_ZERO_CSUM6_TX
)) ||
2898 nla_put_u8(skb
, IFLA_VXLAN_UDP_ZERO_CSUM6_RX
,
2899 !!(vxlan
->flags
& VXLAN_F_UDP_ZERO_CSUM6_RX
)) ||
2900 nla_put_u8(skb
, IFLA_VXLAN_REMCSUM_TX
,
2901 !!(vxlan
->flags
& VXLAN_F_REMCSUM_TX
)) ||
2902 nla_put_u8(skb
, IFLA_VXLAN_REMCSUM_RX
,
2903 !!(vxlan
->flags
& VXLAN_F_REMCSUM_RX
)))
2904 goto nla_put_failure
;
2906 if (nla_put(skb
, IFLA_VXLAN_PORT_RANGE
, sizeof(ports
), &ports
))
2907 goto nla_put_failure
;
2909 if (vxlan
->flags
& VXLAN_F_GBP
&&
2910 nla_put_flag(skb
, IFLA_VXLAN_GBP
))
2911 goto nla_put_failure
;
2919 static struct net
*vxlan_get_link_net(const struct net_device
*dev
)
2921 struct vxlan_dev
*vxlan
= netdev_priv(dev
);
2926 static struct rtnl_link_ops vxlan_link_ops __read_mostly
= {
2928 .maxtype
= IFLA_VXLAN_MAX
,
2929 .policy
= vxlan_policy
,
2930 .priv_size
= sizeof(struct vxlan_dev
),
2931 .setup
= vxlan_setup
,
2932 .validate
= vxlan_validate
,
2933 .newlink
= vxlan_newlink
,
2934 .dellink
= vxlan_dellink
,
2935 .get_size
= vxlan_get_size
,
2936 .fill_info
= vxlan_fill_info
,
2937 .get_link_net
= vxlan_get_link_net
,
2940 static void vxlan_handle_lowerdev_unregister(struct vxlan_net
*vn
,
2941 struct net_device
*dev
)
2943 struct vxlan_dev
*vxlan
, *next
;
2944 LIST_HEAD(list_kill
);
2946 list_for_each_entry_safe(vxlan
, next
, &vn
->vxlan_list
, next
) {
2947 struct vxlan_rdst
*dst
= &vxlan
->default_dst
;
2949 /* In case we created vxlan device with carrier
2950 * and we loose the carrier due to module unload
2951 * we also need to remove vxlan device. In other
2952 * cases, it's not necessary and remote_ifindex
2953 * is 0 here, so no matches.
2955 if (dst
->remote_ifindex
== dev
->ifindex
)
2956 vxlan_dellink(vxlan
->dev
, &list_kill
);
2959 unregister_netdevice_many(&list_kill
);
2962 static int vxlan_lowerdev_event(struct notifier_block
*unused
,
2963 unsigned long event
, void *ptr
)
2965 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
2966 struct vxlan_net
*vn
= net_generic(dev_net(dev
), vxlan_net_id
);
2968 if (event
== NETDEV_UNREGISTER
)
2969 vxlan_handle_lowerdev_unregister(vn
, dev
);
2974 static struct notifier_block vxlan_notifier_block __read_mostly
= {
2975 .notifier_call
= vxlan_lowerdev_event
,
2978 static __net_init
int vxlan_init_net(struct net
*net
)
2980 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
2983 INIT_LIST_HEAD(&vn
->vxlan_list
);
2984 spin_lock_init(&vn
->sock_lock
);
2986 for (h
= 0; h
< PORT_HASH_SIZE
; ++h
)
2987 INIT_HLIST_HEAD(&vn
->sock_list
[h
]);
2992 static void __net_exit
vxlan_exit_net(struct net
*net
)
2994 struct vxlan_net
*vn
= net_generic(net
, vxlan_net_id
);
2995 struct vxlan_dev
*vxlan
, *next
;
2996 struct net_device
*dev
, *aux
;
3000 for_each_netdev_safe(net
, dev
, aux
)
3001 if (dev
->rtnl_link_ops
== &vxlan_link_ops
)
3002 unregister_netdevice_queue(dev
, &list
);
3004 list_for_each_entry_safe(vxlan
, next
, &vn
->vxlan_list
, next
) {
3005 /* If vxlan->dev is in the same netns, it has already been added
3006 * to the list by the previous loop.
3008 if (!net_eq(dev_net(vxlan
->dev
), net
))
3009 unregister_netdevice_queue(dev
, &list
);
3012 unregister_netdevice_many(&list
);
3016 static struct pernet_operations vxlan_net_ops
= {
3017 .init
= vxlan_init_net
,
3018 .exit
= vxlan_exit_net
,
3019 .id
= &vxlan_net_id
,
3020 .size
= sizeof(struct vxlan_net
),
3023 static int __init
vxlan_init_module(void)
3027 vxlan_wq
= alloc_workqueue("vxlan", 0, 0);
3031 get_random_bytes(&vxlan_salt
, sizeof(vxlan_salt
));
3033 rc
= register_pernet_subsys(&vxlan_net_ops
);
3037 rc
= register_netdevice_notifier(&vxlan_notifier_block
);
3041 rc
= rtnl_link_register(&vxlan_link_ops
);
3047 unregister_netdevice_notifier(&vxlan_notifier_block
);
3049 unregister_pernet_subsys(&vxlan_net_ops
);
3051 destroy_workqueue(vxlan_wq
);
3054 late_initcall(vxlan_init_module
);
3056 static void __exit
vxlan_cleanup_module(void)
3058 rtnl_link_unregister(&vxlan_link_ops
);
3059 unregister_netdevice_notifier(&vxlan_notifier_block
);
3060 destroy_workqueue(vxlan_wq
);
3061 unregister_pernet_subsys(&vxlan_net_ops
);
3062 /* rcu_barrier() is called by netns */
3064 module_exit(vxlan_cleanup_module
);
3066 MODULE_LICENSE("GPL");
3067 MODULE_VERSION(VXLAN_VERSION
);
3068 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3069 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3070 MODULE_ALIAS_RTNL_LINK("vxlan");