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Saurabh11814122012-07-17 09:44:54 +00001/*
2 * Linux NET3: IP/IP protocol decoder modified to support
3 * virtual tunnel interface
4 *
5 * Authors:
6 * Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 */
14
15/*
16 This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c
17
18 For comments look at net/ipv4/ip_gre.c --ANK
19 */
20
21
22#include <linux/capability.h>
23#include <linux/module.h>
24#include <linux/types.h>
25#include <linux/kernel.h>
26#include <linux/uaccess.h>
27#include <linux/skbuff.h>
28#include <linux/netdevice.h>
29#include <linux/in.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/netfilter_ipv4.h>
36#include <linux/if_ether.h>
Steffen Klassert78a010c2014-02-21 08:41:10 +010037#include <linux/icmpv6.h>
Saurabh11814122012-07-17 09:44:54 +000038
39#include <net/sock.h>
40#include <net/ip.h>
41#include <net/icmp.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +000042#include <net/ip_tunnels.h>
Saurabh11814122012-07-17 09:44:54 +000043#include <net/inet_ecn.h>
44#include <net/xfrm.h>
45#include <net/net_namespace.h>
46#include <net/netns/generic.h>
47
Saurabh11814122012-07-17 09:44:54 +000048static struct rtnl_link_ops vti_link_ops __read_mostly;
49
50static int vti_net_id __read_mostly;
Saurabh11814122012-07-17 09:44:54 +000051static int vti_tunnel_init(struct net_device *dev);
Saurabh11814122012-07-17 09:44:54 +000052
Steffen Klassertdf3893c2014-02-21 08:41:10 +010053static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
54 int encap_type)
Saurabh11814122012-07-17 09:44:54 +000055{
56 struct ip_tunnel *tunnel;
57 const struct iphdr *iph = ip_hdr(skb);
Amerigo Wangb9959fd2013-07-21 10:46:25 +080058 struct net *net = dev_net(skb->dev);
59 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
Saurabh11814122012-07-17 09:44:54 +000060
Amerigo Wangb9959fd2013-07-21 10:46:25 +080061 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
62 iph->saddr, iph->daddr, 0);
Saurabh11814122012-07-17 09:44:54 +000063 if (tunnel != NULL) {
Steffen Klassertdf3893c2014-02-21 08:41:10 +010064 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
65 goto drop;
Saurabh11814122012-07-17 09:44:54 +000066
Steffen Klassertdf3893c2014-02-21 08:41:10 +010067 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
68 skb->mark = be32_to_cpu(tunnel->parms.i_key);
Christophe Gouault7263a512013-10-08 17:21:22 +020069
Steffen Klassertdf3893c2014-02-21 08:41:10 +010070 return xfrm_input(skb, nexthdr, spi, encap_type);
Saurabh11814122012-07-17 09:44:54 +000071 }
Saurabh11814122012-07-17 09:44:54 +000072
Steffen Klassertdf3893c2014-02-21 08:41:10 +010073 return -EINVAL;
74drop:
75 kfree_skb(skb);
76 return 0;
77}
78
79static int vti_rcv(struct sk_buff *skb)
80{
81 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
82 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
83
84 return vti_input(skb, ip_hdr(skb)->protocol, 0, 0);
85}
86
87static int vti_rcv_cb(struct sk_buff *skb, int err)
88{
89 unsigned short family;
90 struct net_device *dev;
91 struct pcpu_sw_netstats *tstats;
92 struct xfrm_state *x;
93 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
94
95 if (!tunnel)
96 return 1;
97
98 dev = tunnel->dev;
99
100 if (err) {
101 dev->stats.rx_errors++;
102 dev->stats.rx_dropped++;
103
104 return 0;
105 }
106
107 x = xfrm_input_state(skb);
108 family = x->inner_mode->afinfo->family;
109
110 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family))
111 return -EPERM;
112
113 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
114 skb->dev = dev;
115
116 tstats = this_cpu_ptr(dev->tstats);
117
118 u64_stats_update_begin(&tstats->syncp);
119 tstats->rx_packets++;
120 tstats->rx_bytes += skb->len;
121 u64_stats_update_end(&tstats->syncp);
122
123 return 0;
Saurabh11814122012-07-17 09:44:54 +0000124}
125
Steffen Klassert6e2de802014-02-21 08:41:11 +0100126static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
127{
128 xfrm_address_t *daddr = (xfrm_address_t *)&dst;
129 xfrm_address_t *saddr = (xfrm_address_t *)&src;
130
131 /* if there is no transform then this tunnel is not functional.
132 * Or if the xfrm is not mode tunnel.
133 */
134 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
135 x->props.family != AF_INET)
136 return false;
137
138 if (!dst)
139 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
140
141 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
142 return false;
143
144 return true;
145}
146
Steffen Klassert78a010c2014-02-21 08:41:10 +0100147static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
148 struct flowi *fl)
Saurabh11814122012-07-17 09:44:54 +0000149{
150 struct ip_tunnel *tunnel = netdev_priv(dev);
Steffen Klassert6e2de802014-02-21 08:41:11 +0100151 struct ip_tunnel_parm *parms = &tunnel->parms;
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100152 struct dst_entry *dst = skb_dst(skb);
Saurabh11814122012-07-17 09:44:54 +0000153 struct net_device *tdev; /* Device to other host */
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800154 int err;
Saurabh11814122012-07-17 09:44:54 +0000155
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100156 if (!dst) {
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100157 dev->stats.tx_carrier_errors++;
158 goto tx_error_icmp;
159 }
160
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100161 dst_hold(dst);
Steffen Klassert78a010c2014-02-21 08:41:10 +0100162 dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100163 if (IS_ERR(dst)) {
Saurabh11814122012-07-17 09:44:54 +0000164 dev->stats.tx_carrier_errors++;
165 goto tx_error_icmp;
166 }
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100167
Steffen Klassert6e2de802014-02-21 08:41:11 +0100168 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
Saurabh11814122012-07-17 09:44:54 +0000169 dev->stats.tx_carrier_errors++;
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100170 dst_release(dst);
Saurabh11814122012-07-17 09:44:54 +0000171 goto tx_error_icmp;
172 }
Steffen Klassert6e2de802014-02-21 08:41:11 +0100173
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100174 tdev = dst->dev;
Saurabh11814122012-07-17 09:44:54 +0000175
176 if (tdev == dev) {
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100177 dst_release(dst);
Saurabh11814122012-07-17 09:44:54 +0000178 dev->stats.collisions++;
179 goto tx_error;
180 }
181
182 if (tunnel->err_count > 0) {
183 if (time_before(jiffies,
184 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
185 tunnel->err_count--;
186 dst_link_failure(skb);
187 } else
188 tunnel->err_count = 0;
189 }
190
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100191 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100192 skb_dst_set(skb, dst);
Saurabh11814122012-07-17 09:44:54 +0000193 skb->dev = skb_dst(skb)->dev;
194
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800195 err = dst_output(skb);
196 if (net_xmit_eval(err) == 0)
197 err = skb->len;
198 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
Saurabh11814122012-07-17 09:44:54 +0000199 return NETDEV_TX_OK;
200
201tx_error_icmp:
202 dst_link_failure(skb);
203tx_error:
204 dev->stats.tx_errors++;
Eric Dumazet3acfa1e2014-01-18 18:27:49 -0800205 kfree_skb(skb);
Saurabh11814122012-07-17 09:44:54 +0000206 return NETDEV_TX_OK;
207}
208
Steffen Klassert78a010c2014-02-21 08:41:10 +0100209/* This function assumes it is being called from dev_queue_xmit()
210 * and that skb is filled properly by that function.
211 */
212static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
213{
214 struct ip_tunnel *tunnel = netdev_priv(dev);
215 struct flowi fl;
216
217 memset(&fl, 0, sizeof(fl));
218
219 skb->mark = be32_to_cpu(tunnel->parms.o_key);
220
221 switch (skb->protocol) {
222 case htons(ETH_P_IP):
223 xfrm_decode_session(skb, &fl, AF_INET);
224 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
225 break;
226 case htons(ETH_P_IPV6):
227 xfrm_decode_session(skb, &fl, AF_INET6);
228 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
229 break;
230 default:
231 dev->stats.tx_errors++;
232 dev_kfree_skb(skb);
233 return NETDEV_TX_OK;
234 }
235
236 return vti_xmit(skb, dev, &fl);
237}
238
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100239static int vti4_err(struct sk_buff *skb, u32 info)
240{
241 __be32 spi;
Steffen Klassert6d004d62014-05-12 09:09:26 +0200242 __u32 mark;
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100243 struct xfrm_state *x;
244 struct ip_tunnel *tunnel;
245 struct ip_esp_hdr *esph;
246 struct ip_auth_hdr *ah ;
247 struct ip_comp_hdr *ipch;
248 struct net *net = dev_net(skb->dev);
249 const struct iphdr *iph = (const struct iphdr *)skb->data;
250 int protocol = iph->protocol;
251 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
252
253 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
254 iph->daddr, iph->saddr, 0);
255 if (!tunnel)
256 return -1;
257
Steffen Klassert6d004d62014-05-12 09:09:26 +0200258 mark = be32_to_cpu(tunnel->parms.o_key);
259
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100260 switch (protocol) {
261 case IPPROTO_ESP:
262 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
263 spi = esph->spi;
264 break;
265 case IPPROTO_AH:
266 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
267 spi = ah->spi;
268 break;
269 case IPPROTO_COMP:
270 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
271 spi = htonl(ntohs(ipch->cpi));
272 break;
273 default:
274 return 0;
275 }
276
277 switch (icmp_hdr(skb)->type) {
278 case ICMP_DEST_UNREACH:
279 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
280 return 0;
281 case ICMP_REDIRECT:
282 break;
283 default:
284 return 0;
285 }
286
Steffen Klassert6d004d62014-05-12 09:09:26 +0200287 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100288 spi, protocol, AF_INET);
289 if (!x)
290 return 0;
291
292 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
293 ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
294 else
295 ipv4_redirect(skb, net, 0, 0, protocol, 0);
296 xfrm_state_put(x);
297
298 return 0;
299}
300
Saurabh11814122012-07-17 09:44:54 +0000301static int
302vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
303{
304 int err = 0;
305 struct ip_tunnel_parm p;
Saurabh11814122012-07-17 09:44:54 +0000306
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800307 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
308 return -EFAULT;
Saurabh11814122012-07-17 09:44:54 +0000309
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800310 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
Saurabh11814122012-07-17 09:44:54 +0000311 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
312 p.iph.ihl != 5)
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800313 return -EINVAL;
Saurabh11814122012-07-17 09:44:54 +0000314 }
315
Dmitry Popov7c8e6b92014-06-08 02:06:25 +0400316 if (!(p.i_flags & GRE_KEY))
317 p.i_key = 0;
318 if (!(p.o_flags & GRE_KEY))
319 p.o_key = 0;
320
321 p.i_flags = VTI_ISVTI;
322
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800323 err = ip_tunnel_ioctl(dev, &p, cmd);
324 if (err)
325 return err;
Saurabh11814122012-07-17 09:44:54 +0000326
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800327 if (cmd != SIOCDELTUNNEL) {
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100328 p.i_flags |= GRE_KEY;
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800329 p.o_flags |= GRE_KEY;
330 }
331
332 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
333 return -EFAULT;
Saurabh11814122012-07-17 09:44:54 +0000334 return 0;
335}
336
337static const struct net_device_ops vti_netdev_ops = {
338 .ndo_init = vti_tunnel_init,
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800339 .ndo_uninit = ip_tunnel_uninit,
Saurabh11814122012-07-17 09:44:54 +0000340 .ndo_start_xmit = vti_tunnel_xmit,
341 .ndo_do_ioctl = vti_tunnel_ioctl,
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800342 .ndo_change_mtu = ip_tunnel_change_mtu,
Pravin B Shelarf61dd382013-03-25 14:50:00 +0000343 .ndo_get_stats64 = ip_tunnel_get_stats64,
Saurabh11814122012-07-17 09:44:54 +0000344};
345
Saurabh11814122012-07-17 09:44:54 +0000346static void vti_tunnel_setup(struct net_device *dev)
347{
348 dev->netdev_ops = &vti_netdev_ops;
Nicolas Dichtel8d89dcd2014-04-11 15:51:19 +0200349 dev->type = ARPHRD_TUNNEL;
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800350 ip_tunnel_setup(dev, vti_net_id);
351}
352
353static int vti_tunnel_init(struct net_device *dev)
354{
355 struct ip_tunnel *tunnel = netdev_priv(dev);
356 struct iphdr *iph = &tunnel->parms.iph;
357
358 memcpy(dev->dev_addr, &iph->saddr, 4);
359 memcpy(dev->broadcast, &iph->daddr, 4);
Saurabh11814122012-07-17 09:44:54 +0000360
Saurabh11814122012-07-17 09:44:54 +0000361 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
362 dev->mtu = ETH_DATA_LEN;
363 dev->flags = IFF_NOARP;
364 dev->iflink = 0;
365 dev->addr_len = 4;
Saurabh11814122012-07-17 09:44:54 +0000366 dev->features |= NETIF_F_LLTX;
367 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800368
369 return ip_tunnel_init(dev);
Saurabh11814122012-07-17 09:44:54 +0000370}
371
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800372static void __net_init vti_fb_tunnel_init(struct net_device *dev)
Saurabh11814122012-07-17 09:44:54 +0000373{
374 struct ip_tunnel *tunnel = netdev_priv(dev);
375 struct iphdr *iph = &tunnel->parms.iph;
Saurabh11814122012-07-17 09:44:54 +0000376
Saurabh11814122012-07-17 09:44:54 +0000377 iph->version = 4;
378 iph->protocol = IPPROTO_IPIP;
379 iph->ihl = 5;
Saurabh11814122012-07-17 09:44:54 +0000380}
381
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100382static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
Saurabh11814122012-07-17 09:44:54 +0000383 .handler = vti_rcv,
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100384 .input_handler = vti_input,
385 .cb_handler = vti_rcv_cb,
386 .err_handler = vti4_err,
387 .priority = 100,
388};
389
390static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
391 .handler = vti_rcv,
392 .input_handler = vti_input,
393 .cb_handler = vti_rcv_cb,
394 .err_handler = vti4_err,
395 .priority = 100,
396};
397
398static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
399 .handler = vti_rcv,
400 .input_handler = vti_input,
401 .cb_handler = vti_rcv_cb,
402 .err_handler = vti4_err,
403 .priority = 100,
Saurabh11814122012-07-17 09:44:54 +0000404};
405
Saurabh11814122012-07-17 09:44:54 +0000406static int __net_init vti_init_net(struct net *net)
407{
408 int err;
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800409 struct ip_tunnel_net *itn;
Saurabh11814122012-07-17 09:44:54 +0000410
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800411 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
Saurabh11814122012-07-17 09:44:54 +0000412 if (err)
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800413 return err;
414 itn = net_generic(net, vti_net_id);
415 vti_fb_tunnel_init(itn->fb_tunnel_dev);
Saurabh11814122012-07-17 09:44:54 +0000416 return 0;
Saurabh11814122012-07-17 09:44:54 +0000417}
418
419static void __net_exit vti_exit_net(struct net *net)
420{
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800421 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
Nicolas Dichtel6c742e72013-08-13 17:51:11 +0200422 ip_tunnel_delete_net(itn, &vti_link_ops);
Saurabh11814122012-07-17 09:44:54 +0000423}
424
425static struct pernet_operations vti_net_ops = {
426 .init = vti_init_net,
427 .exit = vti_exit_net,
428 .id = &vti_net_id,
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800429 .size = sizeof(struct ip_tunnel_net),
Saurabh11814122012-07-17 09:44:54 +0000430};
431
432static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
433{
434 return 0;
435}
436
437static void vti_netlink_parms(struct nlattr *data[],
438 struct ip_tunnel_parm *parms)
439{
440 memset(parms, 0, sizeof(*parms));
441
442 parms->iph.protocol = IPPROTO_IPIP;
443
444 if (!data)
445 return;
446
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100447 parms->i_flags = VTI_ISVTI;
448
Saurabh11814122012-07-17 09:44:54 +0000449 if (data[IFLA_VTI_LINK])
450 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
451
452 if (data[IFLA_VTI_IKEY])
453 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
454
455 if (data[IFLA_VTI_OKEY])
456 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
457
458 if (data[IFLA_VTI_LOCAL])
459 parms->iph.saddr = nla_get_be32(data[IFLA_VTI_LOCAL]);
460
461 if (data[IFLA_VTI_REMOTE])
462 parms->iph.daddr = nla_get_be32(data[IFLA_VTI_REMOTE]);
463
464}
465
466static int vti_newlink(struct net *src_net, struct net_device *dev,
467 struct nlattr *tb[], struct nlattr *data[])
468{
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800469 struct ip_tunnel_parm parms;
Saurabh11814122012-07-17 09:44:54 +0000470
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800471 vti_netlink_parms(data, &parms);
472 return ip_tunnel_newlink(dev, tb, &parms);
Saurabh11814122012-07-17 09:44:54 +0000473}
474
475static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
476 struct nlattr *data[])
477{
Saurabh11814122012-07-17 09:44:54 +0000478 struct ip_tunnel_parm p;
Saurabh11814122012-07-17 09:44:54 +0000479
Saurabh11814122012-07-17 09:44:54 +0000480 vti_netlink_parms(data, &p);
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800481 return ip_tunnel_changelink(dev, tb, &p);
Saurabh11814122012-07-17 09:44:54 +0000482}
483
484static size_t vti_get_size(const struct net_device *dev)
485{
486 return
487 /* IFLA_VTI_LINK */
488 nla_total_size(4) +
489 /* IFLA_VTI_IKEY */
490 nla_total_size(4) +
491 /* IFLA_VTI_OKEY */
492 nla_total_size(4) +
493 /* IFLA_VTI_LOCAL */
494 nla_total_size(4) +
495 /* IFLA_VTI_REMOTE */
496 nla_total_size(4) +
497 0;
498}
499
500static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
501{
502 struct ip_tunnel *t = netdev_priv(dev);
503 struct ip_tunnel_parm *p = &t->parms;
504
505 nla_put_u32(skb, IFLA_VTI_LINK, p->link);
506 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key);
507 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key);
508 nla_put_be32(skb, IFLA_VTI_LOCAL, p->iph.saddr);
509 nla_put_be32(skb, IFLA_VTI_REMOTE, p->iph.daddr);
510
511 return 0;
512}
513
514static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
515 [IFLA_VTI_LINK] = { .type = NLA_U32 },
516 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
517 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
518 [IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
519 [IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
520};
521
522static struct rtnl_link_ops vti_link_ops __read_mostly = {
523 .kind = "vti",
524 .maxtype = IFLA_VTI_MAX,
525 .policy = vti_policy,
526 .priv_size = sizeof(struct ip_tunnel),
527 .setup = vti_tunnel_setup,
528 .validate = vti_tunnel_validate,
529 .newlink = vti_newlink,
530 .changelink = vti_changelink,
531 .get_size = vti_get_size,
532 .fill_info = vti_fill_info,
533};
534
535static int __init vti_init(void)
536{
537 int err;
538
539 pr_info("IPv4 over IPSec tunneling driver\n");
540
541 err = register_pernet_device(&vti_net_ops);
542 if (err < 0)
543 return err;
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100544 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
Saurabh11814122012-07-17 09:44:54 +0000545 if (err < 0) {
546 unregister_pernet_device(&vti_net_ops);
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800547 pr_info("vti init: can't register tunnel\n");
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100548
549 return err;
550 }
551
552 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
553 if (err < 0) {
554 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
555 unregister_pernet_device(&vti_net_ops);
556 pr_info("vti init: can't register tunnel\n");
557
558 return err;
559 }
560
561 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
562 if (err < 0) {
563 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
564 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
565 unregister_pernet_device(&vti_net_ops);
566 pr_info("vti init: can't register tunnel\n");
567
568 return err;
Saurabh11814122012-07-17 09:44:54 +0000569 }
570
571 err = rtnl_link_register(&vti_link_ops);
572 if (err < 0)
573 goto rtnl_link_failed;
574
575 return err;
576
577rtnl_link_failed:
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100578 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
579 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
580 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
Saurabh11814122012-07-17 09:44:54 +0000581 unregister_pernet_device(&vti_net_ops);
582 return err;
583}
584
585static void __exit vti_fini(void)
586{
587 rtnl_link_unregister(&vti_link_ops);
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100588 if (xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP))
Saurabh11814122012-07-17 09:44:54 +0000589 pr_info("vti close: can't deregister tunnel\n");
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100590 if (xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH))
591 pr_info("vti close: can't deregister tunnel\n");
592 if (xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP))
593 pr_info("vti close: can't deregister tunnel\n");
594
Saurabh11814122012-07-17 09:44:54 +0000595
596 unregister_pernet_device(&vti_net_ops);
597}
598
599module_init(vti_init);
600module_exit(vti_fini);
601MODULE_LICENSE("GPL");
602MODULE_ALIAS_RTNL_LINK("vti");
603MODULE_ALIAS_NETDEV("ip_vti0");