fbc1094964bf57d86388646b0d19f1db923dcbb0
2 * Copyright (c) 2013 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include <linux/capability.h>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/uaccess.h>
27 #include <linux/skbuff.h>
28 #include <linux/netdevice.h>
30 #include <linux/tcp.h>
31 #include <linux/udp.h>
32 #include <linux/if_arp.h>
33 #include <linux/mroute.h>
34 #include <linux/init.h>
35 #include <linux/in6.h>
36 #include <linux/inetdevice.h>
37 #include <linux/igmp.h>
38 #include <linux/netfilter_ipv4.h>
39 #include <linux/etherdevice.h>
40 #include <linux/if_ether.h>
41 #include <linux/if_vlan.h>
42 #include <linux/rculist.h>
47 #include <net/protocol.h>
48 #include <net/ip_tunnels.h>
50 #include <net/checksum.h>
51 #include <net/dsfield.h>
52 #include <net/inet_ecn.h>
54 #include <net/net_namespace.h>
55 #include <net/netns/generic.h>
56 #include <net/rtnetlink.h>
58 #if IS_ENABLED(CONFIG_IPV6)
60 #include <net/ip6_fib.h>
61 #include <net/ip6_route.h>
64 static unsigned int ip_tunnel_hash(struct ip_tunnel_net
*itn
,
65 __be32 key
, __be32 remote
)
67 return hash_32((__force u32
)key
^ (__force u32
)remote
,
71 /* Often modified stats are per cpu, other are shared (netdev->stats) */
72 struct rtnl_link_stats64
*ip_tunnel_get_stats64(struct net_device
*dev
,
73 struct rtnl_link_stats64
*tot
)
77 for_each_possible_cpu(i
) {
78 const struct pcpu_tstats
*tstats
= per_cpu_ptr(dev
->tstats
, i
);
79 u64 rx_packets
, rx_bytes
, tx_packets
, tx_bytes
;
83 start
= u64_stats_fetch_begin_bh(&tstats
->syncp
);
84 rx_packets
= tstats
->rx_packets
;
85 tx_packets
= tstats
->tx_packets
;
86 rx_bytes
= tstats
->rx_bytes
;
87 tx_bytes
= tstats
->tx_bytes
;
88 } while (u64_stats_fetch_retry_bh(&tstats
->syncp
, start
));
90 tot
->rx_packets
+= rx_packets
;
91 tot
->tx_packets
+= tx_packets
;
92 tot
->rx_bytes
+= rx_bytes
;
93 tot
->tx_bytes
+= tx_bytes
;
96 tot
->multicast
= dev
->stats
.multicast
;
98 tot
->rx_crc_errors
= dev
->stats
.rx_crc_errors
;
99 tot
->rx_fifo_errors
= dev
->stats
.rx_fifo_errors
;
100 tot
->rx_length_errors
= dev
->stats
.rx_length_errors
;
101 tot
->rx_frame_errors
= dev
->stats
.rx_frame_errors
;
102 tot
->rx_errors
= dev
->stats
.rx_errors
;
104 tot
->tx_fifo_errors
= dev
->stats
.tx_fifo_errors
;
105 tot
->tx_carrier_errors
= dev
->stats
.tx_carrier_errors
;
106 tot
->tx_dropped
= dev
->stats
.tx_dropped
;
107 tot
->tx_aborted_errors
= dev
->stats
.tx_aborted_errors
;
108 tot
->tx_errors
= dev
->stats
.tx_errors
;
110 tot
->collisions
= dev
->stats
.collisions
;
114 EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64
);
116 static bool ip_tunnel_key_match(const struct ip_tunnel_parm
*p
,
117 __be16 flags
, __be32 key
)
119 if (p
->i_flags
& TUNNEL_KEY
) {
120 if (flags
& TUNNEL_KEY
)
121 return key
== p
->i_key
;
123 /* key expected, none present */
126 return !(flags
& TUNNEL_KEY
);
129 /* Fallback tunnel: no source, no destination, no key, no options
132 We require exact key match i.e. if a key is present in packet
133 it will match only tunnel with the same key; if it is not present,
134 it will match only keyless tunnel.
136 All keysless packets, if not matched configured keyless tunnels
137 will match fallback tunnel.
138 Given src, dst and key, find appropriate for input tunnel.
140 struct ip_tunnel
*ip_tunnel_lookup(struct ip_tunnel_net
*itn
,
141 int link
, __be16 flags
,
142 __be32 remote
, __be32 local
,
146 struct ip_tunnel
*t
, *cand
= NULL
;
147 struct hlist_head
*head
;
149 hash
= ip_tunnel_hash(itn
, key
, remote
);
150 head
= &itn
->tunnels
[hash
];
152 hlist_for_each_entry_rcu(t
, head
, hash_node
) {
153 if (local
!= t
->parms
.iph
.saddr
||
154 remote
!= t
->parms
.iph
.daddr
||
155 !(t
->dev
->flags
& IFF_UP
))
158 if (!ip_tunnel_key_match(&t
->parms
, flags
, key
))
161 if (t
->parms
.link
== link
)
167 hlist_for_each_entry_rcu(t
, head
, hash_node
) {
168 if (remote
!= t
->parms
.iph
.daddr
||
169 !(t
->dev
->flags
& IFF_UP
))
172 if (!ip_tunnel_key_match(&t
->parms
, flags
, key
))
175 if (t
->parms
.link
== link
)
181 hash
= ip_tunnel_hash(itn
, key
, 0);
182 head
= &itn
->tunnels
[hash
];
184 hlist_for_each_entry_rcu(t
, head
, hash_node
) {
185 if ((local
!= t
->parms
.iph
.saddr
&&
186 (local
!= t
->parms
.iph
.daddr
||
187 !ipv4_is_multicast(local
))) ||
188 !(t
->dev
->flags
& IFF_UP
))
191 if (!ip_tunnel_key_match(&t
->parms
, flags
, key
))
194 if (t
->parms
.link
== link
)
200 if (flags
& TUNNEL_NO_KEY
)
201 goto skip_key_lookup
;
203 hlist_for_each_entry_rcu(t
, head
, hash_node
) {
204 if (t
->parms
.i_key
!= key
||
205 !(t
->dev
->flags
& IFF_UP
))
208 if (t
->parms
.link
== link
)
218 if (itn
->fb_tunnel_dev
&& itn
->fb_tunnel_dev
->flags
& IFF_UP
)
219 return netdev_priv(itn
->fb_tunnel_dev
);
224 EXPORT_SYMBOL_GPL(ip_tunnel_lookup
);
226 static struct hlist_head
*ip_bucket(struct ip_tunnel_net
*itn
,
227 struct ip_tunnel_parm
*parms
)
232 if (parms
->iph
.daddr
&& !ipv4_is_multicast(parms
->iph
.daddr
))
233 remote
= parms
->iph
.daddr
;
237 h
= ip_tunnel_hash(itn
, parms
->i_key
, remote
);
238 return &itn
->tunnels
[h
];
241 static void ip_tunnel_add(struct ip_tunnel_net
*itn
, struct ip_tunnel
*t
)
243 struct hlist_head
*head
= ip_bucket(itn
, &t
->parms
);
245 hlist_add_head_rcu(&t
->hash_node
, head
);
248 static void ip_tunnel_del(struct ip_tunnel
*t
)
250 hlist_del_init_rcu(&t
->hash_node
);
253 static struct ip_tunnel
*ip_tunnel_find(struct ip_tunnel_net
*itn
,
254 struct ip_tunnel_parm
*parms
,
257 __be32 remote
= parms
->iph
.daddr
;
258 __be32 local
= parms
->iph
.saddr
;
259 __be32 key
= parms
->i_key
;
260 int link
= parms
->link
;
261 struct ip_tunnel
*t
= NULL
;
262 struct hlist_head
*head
= ip_bucket(itn
, parms
);
264 hlist_for_each_entry_rcu(t
, head
, hash_node
) {
265 if (local
== t
->parms
.iph
.saddr
&&
266 remote
== t
->parms
.iph
.daddr
&&
267 key
== t
->parms
.i_key
&&
268 link
== t
->parms
.link
&&
269 type
== t
->dev
->type
)
275 static struct net_device
*__ip_tunnel_create(struct net
*net
,
276 const struct rtnl_link_ops
*ops
,
277 struct ip_tunnel_parm
*parms
)
280 struct ip_tunnel
*tunnel
;
281 struct net_device
*dev
;
285 strlcpy(name
, parms
->name
, IFNAMSIZ
);
287 if (strlen(ops
->kind
) > (IFNAMSIZ
- 3)) {
291 strlcpy(name
, ops
->kind
, IFNAMSIZ
);
292 strncat(name
, "%d", 2);
296 dev
= alloc_netdev(ops
->priv_size
, name
, ops
->setup
);
301 dev_net_set(dev
, net
);
303 dev
->rtnl_link_ops
= ops
;
305 tunnel
= netdev_priv(dev
);
306 tunnel
->parms
= *parms
;
309 err
= register_netdevice(dev
);
321 static inline struct rtable
*ip_route_output_tunnel(struct net
*net
,
324 __be32 daddr
, __be32 saddr
,
325 __be32 key
, __u8 tos
, int oif
)
327 memset(fl4
, 0, sizeof(*fl4
));
328 fl4
->flowi4_oif
= oif
;
331 fl4
->flowi4_tos
= tos
;
332 fl4
->flowi4_proto
= proto
;
333 fl4
->fl4_gre_key
= key
;
334 return ip_route_output_key(net
, fl4
);
337 static int ip_tunnel_bind_dev(struct net_device
*dev
)
339 struct net_device
*tdev
= NULL
;
340 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
341 const struct iphdr
*iph
;
342 int hlen
= LL_MAX_HEADER
;
343 int mtu
= ETH_DATA_LEN
;
344 int t_hlen
= tunnel
->hlen
+ sizeof(struct iphdr
);
346 iph
= &tunnel
->parms
.iph
;
348 /* Guess output device to choose reasonable mtu and needed_headroom */
353 rt
= ip_route_output_tunnel(dev_net(dev
), &fl4
,
354 tunnel
->parms
.iph
.protocol
,
355 iph
->daddr
, iph
->saddr
,
363 if (dev
->type
!= ARPHRD_ETHER
)
364 dev
->flags
|= IFF_POINTOPOINT
;
367 if (!tdev
&& tunnel
->parms
.link
)
368 tdev
= __dev_get_by_index(dev_net(dev
), tunnel
->parms
.link
);
371 hlen
= tdev
->hard_header_len
+ tdev
->needed_headroom
;
374 dev
->iflink
= tunnel
->parms
.link
;
376 dev
->needed_headroom
= t_hlen
+ hlen
;
377 mtu
-= (dev
->hard_header_len
+ t_hlen
);
385 static struct ip_tunnel
*ip_tunnel_create(struct net
*net
,
386 struct ip_tunnel_net
*itn
,
387 struct ip_tunnel_parm
*parms
)
389 struct ip_tunnel
*nt
, *fbt
;
390 struct net_device
*dev
;
392 BUG_ON(!itn
->fb_tunnel_dev
);
393 fbt
= netdev_priv(itn
->fb_tunnel_dev
);
394 dev
= __ip_tunnel_create(net
, itn
->fb_tunnel_dev
->rtnl_link_ops
, parms
);
398 dev
->mtu
= ip_tunnel_bind_dev(dev
);
400 nt
= netdev_priv(dev
);
401 ip_tunnel_add(itn
, nt
);
405 int ip_tunnel_rcv(struct ip_tunnel
*tunnel
, struct sk_buff
*skb
,
406 const struct tnl_ptk_info
*tpi
, bool log_ecn_error
)
408 struct pcpu_tstats
*tstats
;
409 const struct iphdr
*iph
= ip_hdr(skb
);
412 #ifdef CONFIG_NET_IPGRE_BROADCAST
413 if (ipv4_is_multicast(iph
->daddr
)) {
414 /* Looped back packet, drop it! */
415 if (rt_is_output_route(skb_rtable(skb
)))
417 tunnel
->dev
->stats
.multicast
++;
418 skb
->pkt_type
= PACKET_BROADCAST
;
422 if ((!(tpi
->flags
&TUNNEL_CSUM
) && (tunnel
->parms
.i_flags
&TUNNEL_CSUM
)) ||
423 ((tpi
->flags
&TUNNEL_CSUM
) && !(tunnel
->parms
.i_flags
&TUNNEL_CSUM
))) {
424 tunnel
->dev
->stats
.rx_crc_errors
++;
425 tunnel
->dev
->stats
.rx_errors
++;
429 if (tunnel
->parms
.i_flags
&TUNNEL_SEQ
) {
430 if (!(tpi
->flags
&TUNNEL_SEQ
) ||
431 (tunnel
->i_seqno
&& (s32
)(ntohl(tpi
->seq
) - tunnel
->i_seqno
) < 0)) {
432 tunnel
->dev
->stats
.rx_fifo_errors
++;
433 tunnel
->dev
->stats
.rx_errors
++;
436 tunnel
->i_seqno
= ntohl(tpi
->seq
) + 1;
439 err
= IP_ECN_decapsulate(iph
, skb
);
442 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
443 &iph
->saddr
, iph
->tos
);
445 ++tunnel
->dev
->stats
.rx_frame_errors
;
446 ++tunnel
->dev
->stats
.rx_errors
;
451 tstats
= this_cpu_ptr(tunnel
->dev
->tstats
);
452 u64_stats_update_begin(&tstats
->syncp
);
453 tstats
->rx_packets
++;
454 tstats
->rx_bytes
+= skb
->len
;
455 u64_stats_update_end(&tstats
->syncp
);
457 if (tunnel
->dev
->type
== ARPHRD_ETHER
) {
458 skb
->protocol
= eth_type_trans(skb
, tunnel
->dev
);
459 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_HLEN
);
461 skb
->dev
= tunnel
->dev
;
464 if (tunnel
->net
!= dev_net(tunnel
->dev
))
465 skb_scrub_packet(skb
);
467 gro_cells_receive(&tunnel
->gro_cells
, skb
);
474 EXPORT_SYMBOL_GPL(ip_tunnel_rcv
);
476 static int tnl_update_pmtu(struct net_device
*dev
, struct sk_buff
*skb
,
477 struct rtable
*rt
, __be16 df
)
479 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
480 int pkt_size
= skb
->len
- tunnel
->hlen
- dev
->hard_header_len
;
484 mtu
= dst_mtu(&rt
->dst
) - dev
->hard_header_len
485 - sizeof(struct iphdr
) - tunnel
->hlen
;
487 mtu
= skb_dst(skb
) ? dst_mtu(skb_dst(skb
)) : dev
->mtu
;
490 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), NULL
, skb
, mtu
);
492 if (skb
->protocol
== htons(ETH_P_IP
)) {
493 if (!skb_is_gso(skb
) &&
494 (df
& htons(IP_DF
)) && mtu
< pkt_size
) {
495 memset(IPCB(skb
), 0, sizeof(*IPCB(skb
)));
496 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_FRAG_NEEDED
, htonl(mtu
));
500 #if IS_ENABLED(CONFIG_IPV6)
501 else if (skb
->protocol
== htons(ETH_P_IPV6
)) {
502 struct rt6_info
*rt6
= (struct rt6_info
*)skb_dst(skb
);
504 if (rt6
&& mtu
< dst_mtu(skb_dst(skb
)) &&
505 mtu
>= IPV6_MIN_MTU
) {
506 if ((tunnel
->parms
.iph
.daddr
&&
507 !ipv4_is_multicast(tunnel
->parms
.iph
.daddr
)) ||
508 rt6
->rt6i_dst
.plen
== 128) {
509 rt6
->rt6i_flags
|= RTF_MODIFIED
;
510 dst_metric_set(skb_dst(skb
), RTAX_MTU
, mtu
);
514 if (!skb_is_gso(skb
) && mtu
>= IPV6_MIN_MTU
&&
516 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
524 void ip_tunnel_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
525 const struct iphdr
*tnl_params
, const u8 protocol
)
527 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
528 const struct iphdr
*inner_iph
;
532 struct rtable
*rt
; /* Route to the other host */
533 unsigned int max_headroom
; /* The extra header space needed */
537 inner_iph
= (const struct iphdr
*)skb_inner_network_header(skb
);
539 dst
= tnl_params
->daddr
;
543 if (skb_dst(skb
) == NULL
) {
544 dev
->stats
.tx_fifo_errors
++;
548 if (skb
->protocol
== htons(ETH_P_IP
)) {
549 rt
= skb_rtable(skb
);
550 dst
= rt_nexthop(rt
, inner_iph
->daddr
);
552 #if IS_ENABLED(CONFIG_IPV6)
553 else if (skb
->protocol
== htons(ETH_P_IPV6
)) {
554 const struct in6_addr
*addr6
;
555 struct neighbour
*neigh
;
556 bool do_tx_error_icmp
;
559 neigh
= dst_neigh_lookup(skb_dst(skb
),
560 &ipv6_hdr(skb
)->daddr
);
564 addr6
= (const struct in6_addr
*)&neigh
->primary_key
;
565 addr_type
= ipv6_addr_type(addr6
);
567 if (addr_type
== IPV6_ADDR_ANY
) {
568 addr6
= &ipv6_hdr(skb
)->daddr
;
569 addr_type
= ipv6_addr_type(addr6
);
572 if ((addr_type
& IPV6_ADDR_COMPATv4
) == 0)
573 do_tx_error_icmp
= true;
575 do_tx_error_icmp
= false;
576 dst
= addr6
->s6_addr32
[3];
578 neigh_release(neigh
);
579 if (do_tx_error_icmp
)
587 tos
= tnl_params
->tos
;
590 if (skb
->protocol
== htons(ETH_P_IP
))
591 tos
= inner_iph
->tos
;
592 else if (skb
->protocol
== htons(ETH_P_IPV6
))
593 tos
= ipv6_get_dsfield((const struct ipv6hdr
*)inner_iph
);
596 rt
= ip_route_output_tunnel(tunnel
->net
, &fl4
,
598 dst
, tnl_params
->saddr
,
603 dev
->stats
.tx_carrier_errors
++;
606 if (rt
->dst
.dev
== dev
) {
608 dev
->stats
.collisions
++;
612 if (tnl_update_pmtu(dev
, skb
, rt
, tnl_params
->frag_off
)) {
617 if (tunnel
->net
!= dev_net(dev
))
618 skb_scrub_packet(skb
);
620 if (tunnel
->err_count
> 0) {
621 if (time_before(jiffies
,
622 tunnel
->err_time
+ IPTUNNEL_ERR_TIMEO
)) {
625 dst_link_failure(skb
);
627 tunnel
->err_count
= 0;
630 ttl
= tnl_params
->ttl
;
632 if (skb
->protocol
== htons(ETH_P_IP
))
633 ttl
= inner_iph
->ttl
;
634 #if IS_ENABLED(CONFIG_IPV6)
635 else if (skb
->protocol
== htons(ETH_P_IPV6
))
636 ttl
= ((const struct ipv6hdr
*)inner_iph
)->hop_limit
;
639 ttl
= ip4_dst_hoplimit(&rt
->dst
);
642 df
= tnl_params
->frag_off
;
643 if (skb
->protocol
== htons(ETH_P_IP
))
644 df
|= (inner_iph
->frag_off
&htons(IP_DF
));
646 max_headroom
= LL_RESERVED_SPACE(rt
->dst
.dev
) + sizeof(struct iphdr
)
647 + rt
->dst
.header_len
;
648 if (max_headroom
> dev
->needed_headroom
) {
649 dev
->needed_headroom
= max_headroom
;
650 if (skb_cow_head(skb
, dev
->needed_headroom
)) {
651 dev
->stats
.tx_dropped
++;
657 err
= iptunnel_xmit(dev_net(dev
), rt
, skb
,
658 fl4
.saddr
, fl4
.daddr
, protocol
,
659 ip_tunnel_ecn_encap(tos
, inner_iph
, skb
), ttl
, df
);
660 iptunnel_xmit_stats(err
, &dev
->stats
, dev
->tstats
);
664 #if IS_ENABLED(CONFIG_IPV6)
666 dst_link_failure(skb
);
669 dev
->stats
.tx_errors
++;
672 EXPORT_SYMBOL_GPL(ip_tunnel_xmit
);
674 static void ip_tunnel_update(struct ip_tunnel_net
*itn
,
676 struct net_device
*dev
,
677 struct ip_tunnel_parm
*p
,
681 t
->parms
.iph
.saddr
= p
->iph
.saddr
;
682 t
->parms
.iph
.daddr
= p
->iph
.daddr
;
683 t
->parms
.i_key
= p
->i_key
;
684 t
->parms
.o_key
= p
->o_key
;
685 if (dev
->type
!= ARPHRD_ETHER
) {
686 memcpy(dev
->dev_addr
, &p
->iph
.saddr
, 4);
687 memcpy(dev
->broadcast
, &p
->iph
.daddr
, 4);
689 ip_tunnel_add(itn
, t
);
691 t
->parms
.iph
.ttl
= p
->iph
.ttl
;
692 t
->parms
.iph
.tos
= p
->iph
.tos
;
693 t
->parms
.iph
.frag_off
= p
->iph
.frag_off
;
695 if (t
->parms
.link
!= p
->link
) {
698 t
->parms
.link
= p
->link
;
699 mtu
= ip_tunnel_bind_dev(dev
);
703 netdev_state_change(dev
);
706 int ip_tunnel_ioctl(struct net_device
*dev
, struct ip_tunnel_parm
*p
, int cmd
)
710 struct net
*net
= dev_net(dev
);
711 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
712 struct ip_tunnel_net
*itn
= net_generic(net
, tunnel
->ip_tnl_net_id
);
714 BUG_ON(!itn
->fb_tunnel_dev
);
718 if (dev
== itn
->fb_tunnel_dev
)
719 t
= ip_tunnel_find(itn
, p
, itn
->fb_tunnel_dev
->type
);
721 t
= netdev_priv(dev
);
722 memcpy(p
, &t
->parms
, sizeof(*p
));
728 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
731 p
->iph
.frag_off
|= htons(IP_DF
);
732 if (!(p
->i_flags
&TUNNEL_KEY
))
734 if (!(p
->o_flags
&TUNNEL_KEY
))
737 t
= ip_tunnel_find(itn
, p
, itn
->fb_tunnel_dev
->type
);
739 if (!t
&& (cmd
== SIOCADDTUNNEL
))
740 t
= ip_tunnel_create(net
, itn
, p
);
742 if (dev
!= itn
->fb_tunnel_dev
&& cmd
== SIOCCHGTUNNEL
) {
749 unsigned int nflags
= 0;
751 if (ipv4_is_multicast(p
->iph
.daddr
))
752 nflags
= IFF_BROADCAST
;
753 else if (p
->iph
.daddr
)
754 nflags
= IFF_POINTOPOINT
;
756 if ((dev
->flags
^nflags
)&(IFF_POINTOPOINT
|IFF_BROADCAST
)) {
761 t
= netdev_priv(dev
);
767 ip_tunnel_update(itn
, t
, dev
, p
, true);
769 err
= (cmd
== SIOCADDTUNNEL
? -ENOBUFS
: -ENOENT
);
774 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
777 if (dev
== itn
->fb_tunnel_dev
) {
779 t
= ip_tunnel_find(itn
, p
, itn
->fb_tunnel_dev
->type
);
783 if (t
== netdev_priv(itn
->fb_tunnel_dev
))
787 unregister_netdevice(dev
);
798 EXPORT_SYMBOL_GPL(ip_tunnel_ioctl
);
800 int ip_tunnel_change_mtu(struct net_device
*dev
, int new_mtu
)
802 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
803 int t_hlen
= tunnel
->hlen
+ sizeof(struct iphdr
);
806 new_mtu
> 0xFFF8 - dev
->hard_header_len
- t_hlen
)
811 EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu
);
813 static void ip_tunnel_dev_free(struct net_device
*dev
)
815 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
817 gro_cells_destroy(&tunnel
->gro_cells
);
818 free_percpu(dev
->tstats
);
822 void ip_tunnel_dellink(struct net_device
*dev
, struct list_head
*head
)
824 struct net
*net
= dev_net(dev
);
825 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
826 struct ip_tunnel_net
*itn
;
828 itn
= net_generic(net
, tunnel
->ip_tnl_net_id
);
830 if (itn
->fb_tunnel_dev
!= dev
) {
831 ip_tunnel_del(netdev_priv(dev
));
832 unregister_netdevice_queue(dev
, head
);
835 EXPORT_SYMBOL_GPL(ip_tunnel_dellink
);
837 int ip_tunnel_init_net(struct net
*net
, int ip_tnl_net_id
,
838 struct rtnl_link_ops
*ops
, char *devname
)
840 struct ip_tunnel_net
*itn
= net_generic(net
, ip_tnl_net_id
);
841 struct ip_tunnel_parm parms
;
844 for (i
= 0; i
< IP_TNL_HASH_SIZE
; i
++)
845 INIT_HLIST_HEAD(&itn
->tunnels
[i
]);
848 itn
->fb_tunnel_dev
= NULL
;
852 memset(&parms
, 0, sizeof(parms
));
854 strlcpy(parms
.name
, devname
, IFNAMSIZ
);
857 itn
->fb_tunnel_dev
= __ip_tunnel_create(net
, ops
, &parms
);
860 if (IS_ERR(itn
->fb_tunnel_dev
))
861 return PTR_ERR(itn
->fb_tunnel_dev
);
865 EXPORT_SYMBOL_GPL(ip_tunnel_init_net
);
867 static void ip_tunnel_destroy(struct ip_tunnel_net
*itn
, struct list_head
*head
)
871 for (h
= 0; h
< IP_TNL_HASH_SIZE
; h
++) {
873 struct hlist_node
*n
;
874 struct hlist_head
*thead
= &itn
->tunnels
[h
];
876 hlist_for_each_entry_safe(t
, n
, thead
, hash_node
)
877 unregister_netdevice_queue(t
->dev
, head
);
879 if (itn
->fb_tunnel_dev
)
880 unregister_netdevice_queue(itn
->fb_tunnel_dev
, head
);
883 void ip_tunnel_delete_net(struct ip_tunnel_net
*itn
)
888 ip_tunnel_destroy(itn
, &list
);
889 unregister_netdevice_many(&list
);
892 EXPORT_SYMBOL_GPL(ip_tunnel_delete_net
);
894 int ip_tunnel_newlink(struct net_device
*dev
, struct nlattr
*tb
[],
895 struct ip_tunnel_parm
*p
)
897 struct ip_tunnel
*nt
;
898 struct net
*net
= dev_net(dev
);
899 struct ip_tunnel_net
*itn
;
903 nt
= netdev_priv(dev
);
904 itn
= net_generic(net
, nt
->ip_tnl_net_id
);
906 if (ip_tunnel_find(itn
, p
, dev
->type
))
911 err
= register_netdevice(dev
);
915 if (dev
->type
== ARPHRD_ETHER
&& !tb
[IFLA_ADDRESS
])
916 eth_hw_addr_random(dev
);
918 mtu
= ip_tunnel_bind_dev(dev
);
922 ip_tunnel_add(itn
, nt
);
927 EXPORT_SYMBOL_GPL(ip_tunnel_newlink
);
929 int ip_tunnel_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
930 struct ip_tunnel_parm
*p
)
932 struct ip_tunnel
*t
, *nt
;
933 struct net
*net
= dev_net(dev
);
934 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
935 struct ip_tunnel_net
*itn
= net_generic(net
, tunnel
->ip_tnl_net_id
);
937 if (dev
== itn
->fb_tunnel_dev
)
940 nt
= netdev_priv(dev
);
942 t
= ip_tunnel_find(itn
, p
, dev
->type
);
950 if (dev
->type
!= ARPHRD_ETHER
) {
951 unsigned int nflags
= 0;
953 if (ipv4_is_multicast(p
->iph
.daddr
))
954 nflags
= IFF_BROADCAST
;
955 else if (p
->iph
.daddr
)
956 nflags
= IFF_POINTOPOINT
;
958 if ((dev
->flags
^ nflags
) &
959 (IFF_POINTOPOINT
| IFF_BROADCAST
))
964 ip_tunnel_update(itn
, t
, dev
, p
, !tb
[IFLA_MTU
]);
967 EXPORT_SYMBOL_GPL(ip_tunnel_changelink
);
969 int ip_tunnel_init(struct net_device
*dev
)
971 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
972 struct iphdr
*iph
= &tunnel
->parms
.iph
;
975 dev
->destructor
= ip_tunnel_dev_free
;
976 dev
->tstats
= alloc_percpu(struct pcpu_tstats
);
980 err
= gro_cells_init(&tunnel
->gro_cells
, dev
);
982 free_percpu(dev
->tstats
);
987 strcpy(tunnel
->parms
.name
, dev
->name
);
993 EXPORT_SYMBOL_GPL(ip_tunnel_init
);
995 void ip_tunnel_uninit(struct net_device
*dev
)
997 struct net
*net
= dev_net(dev
);
998 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
999 struct ip_tunnel_net
*itn
;
1001 itn
= net_generic(net
, tunnel
->ip_tnl_net_id
);
1002 /* fb_tunnel_dev will be unregisted in net-exit call. */
1003 if (itn
->fb_tunnel_dev
!= dev
)
1004 ip_tunnel_del(netdev_priv(dev
));
1006 EXPORT_SYMBOL_GPL(ip_tunnel_uninit
);
1008 /* Do least required initialization, rest of init is done in tunnel_init call */
1009 void ip_tunnel_setup(struct net_device
*dev
, int net_id
)
1011 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
1012 tunnel
->ip_tnl_net_id
= net_id
;
1014 EXPORT_SYMBOL_GPL(ip_tunnel_setup
);
1016 MODULE_LICENSE("GPL");
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