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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>
Saurabh11814122012-07-17 09:44:54 +000033#include <linux/init.h>
34#include <linux/netfilter_ipv4.h>
35#include <linux/if_ether.h>
Steffen Klassert78a010c2014-02-21 08:41:10 +010036#include <linux/icmpv6.h>
Saurabh11814122012-07-17 09:44:54 +000037
38#include <net/sock.h>
39#include <net/ip.h>
40#include <net/icmp.h>
Pravin B Shelarc5441932013-03-25 14:49:35 +000041#include <net/ip_tunnels.h>
Saurabh11814122012-07-17 09:44:54 +000042#include <net/inet_ecn.h>
43#include <net/xfrm.h>
44#include <net/net_namespace.h>
45#include <net/netns/generic.h>
46
Saurabh11814122012-07-17 09:44:54 +000047static struct rtnl_link_ops vti_link_ops __read_mostly;
48
49static int vti_net_id __read_mostly;
Saurabh11814122012-07-17 09:44:54 +000050static int vti_tunnel_init(struct net_device *dev);
Saurabh11814122012-07-17 09:44:54 +000051
Steffen Klassertdf3893c2014-02-21 08:41:10 +010052static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
53 int encap_type)
Saurabh11814122012-07-17 09:44:54 +000054{
55 struct ip_tunnel *tunnel;
56 const struct iphdr *iph = ip_hdr(skb);
Amerigo Wangb9959fd2013-07-21 10:46:25 +080057 struct net *net = dev_net(skb->dev);
58 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
Saurabh11814122012-07-17 09:44:54 +000059
Amerigo Wangb9959fd2013-07-21 10:46:25 +080060 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
61 iph->saddr, iph->daddr, 0);
Ian Morris00db4122015-04-03 09:17:27 +010062 if (tunnel) {
Steffen Klassertdf3893c2014-02-21 08:41:10 +010063 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
64 goto drop;
Saurabh11814122012-07-17 09:44:54 +000065
Steffen Klassertdf3893c2014-02-21 08:41:10 +010066 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
Christophe Gouault7263a512013-10-08 17:21:22 +020067
Steffen Klassertdf3893c2014-02-21 08:41:10 +010068 return xfrm_input(skb, nexthdr, spi, encap_type);
Saurabh11814122012-07-17 09:44:54 +000069 }
Saurabh11814122012-07-17 09:44:54 +000070
Steffen Klassertdf3893c2014-02-21 08:41:10 +010071 return -EINVAL;
72drop:
73 kfree_skb(skb);
74 return 0;
75}
76
77static int vti_rcv(struct sk_buff *skb)
78{
79 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
80 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
81
82 return vti_input(skb, ip_hdr(skb)->protocol, 0, 0);
83}
84
85static int vti_rcv_cb(struct sk_buff *skb, int err)
86{
87 unsigned short family;
88 struct net_device *dev;
89 struct pcpu_sw_netstats *tstats;
90 struct xfrm_state *x;
91 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
Alexander Duyckd55c6702015-05-27 07:16:54 -070092 u32 orig_mark = skb->mark;
93 int ret;
Steffen Klassertdf3893c2014-02-21 08:41:10 +010094
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
Alexander Duyckd55c6702015-05-27 07:16:54 -0700110 skb->mark = be32_to_cpu(tunnel->parms.i_key);
111 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
112 skb->mark = orig_mark;
113
114 if (!ret)
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100115 return -EPERM;
116
117 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
118 skb->dev = dev;
119
120 tstats = this_cpu_ptr(dev->tstats);
121
122 u64_stats_update_begin(&tstats->syncp);
123 tstats->rx_packets++;
124 tstats->rx_bytes += skb->len;
125 u64_stats_update_end(&tstats->syncp);
126
127 return 0;
Saurabh11814122012-07-17 09:44:54 +0000128}
129
Steffen Klassert6e2de802014-02-21 08:41:11 +0100130static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
131{
132 xfrm_address_t *daddr = (xfrm_address_t *)&dst;
133 xfrm_address_t *saddr = (xfrm_address_t *)&src;
134
135 /* if there is no transform then this tunnel is not functional.
136 * Or if the xfrm is not mode tunnel.
137 */
138 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
139 x->props.family != AF_INET)
140 return false;
141
142 if (!dst)
143 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
144
145 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
146 return false;
147
148 return true;
149}
150
Steffen Klassert78a010c2014-02-21 08:41:10 +0100151static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
152 struct flowi *fl)
Saurabh11814122012-07-17 09:44:54 +0000153{
154 struct ip_tunnel *tunnel = netdev_priv(dev);
Steffen Klassert6e2de802014-02-21 08:41:11 +0100155 struct ip_tunnel_parm *parms = &tunnel->parms;
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100156 struct dst_entry *dst = skb_dst(skb);
Saurabh11814122012-07-17 09:44:54 +0000157 struct net_device *tdev; /* Device to other host */
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800158 int err;
Saurabh11814122012-07-17 09:44:54 +0000159
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100160 if (!dst) {
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100161 dev->stats.tx_carrier_errors++;
162 goto tx_error_icmp;
163 }
164
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100165 dst_hold(dst);
Steffen Klassert78a010c2014-02-21 08:41:10 +0100166 dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100167 if (IS_ERR(dst)) {
Saurabh11814122012-07-17 09:44:54 +0000168 dev->stats.tx_carrier_errors++;
169 goto tx_error_icmp;
170 }
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100171
Steffen Klassert6e2de802014-02-21 08:41:11 +0100172 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
Saurabh11814122012-07-17 09:44:54 +0000173 dev->stats.tx_carrier_errors++;
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100174 dst_release(dst);
Saurabh11814122012-07-17 09:44:54 +0000175 goto tx_error_icmp;
176 }
Steffen Klassert6e2de802014-02-21 08:41:11 +0100177
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100178 tdev = dst->dev;
Saurabh11814122012-07-17 09:44:54 +0000179
180 if (tdev == dev) {
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100181 dst_release(dst);
Saurabh11814122012-07-17 09:44:54 +0000182 dev->stats.collisions++;
183 goto tx_error;
184 }
185
186 if (tunnel->err_count > 0) {
187 if (time_before(jiffies,
188 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
189 tunnel->err_count--;
190 dst_link_failure(skb);
191 } else
192 tunnel->err_count = 0;
193 }
194
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100195 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
Steffen Klasserta34cd4f2014-02-21 08:41:10 +0100196 skb_dst_set(skb, dst);
Saurabh11814122012-07-17 09:44:54 +0000197 skb->dev = skb_dst(skb)->dev;
198
Eric W. Biederman13206b62015-10-07 16:48:35 -0500199 err = dst_output(tunnel->net, skb->sk, skb);
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800200 if (net_xmit_eval(err) == 0)
201 err = skb->len;
Pravin B Shelar039f5062015-12-24 14:34:54 -0800202 iptunnel_xmit_stats(dev, err);
Saurabh11814122012-07-17 09:44:54 +0000203 return NETDEV_TX_OK;
204
205tx_error_icmp:
206 dst_link_failure(skb);
207tx_error:
208 dev->stats.tx_errors++;
Eric Dumazet3acfa1e2014-01-18 18:27:49 -0800209 kfree_skb(skb);
Saurabh11814122012-07-17 09:44:54 +0000210 return NETDEV_TX_OK;
211}
212
Steffen Klassert78a010c2014-02-21 08:41:10 +0100213/* This function assumes it is being called from dev_queue_xmit()
214 * and that skb is filled properly by that function.
215 */
216static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
217{
218 struct ip_tunnel *tunnel = netdev_priv(dev);
219 struct flowi fl;
220
221 memset(&fl, 0, sizeof(fl));
222
Steffen Klassert78a010c2014-02-21 08:41:10 +0100223 switch (skb->protocol) {
224 case htons(ETH_P_IP):
225 xfrm_decode_session(skb, &fl, AF_INET);
226 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
227 break;
228 case htons(ETH_P_IPV6):
229 xfrm_decode_session(skb, &fl, AF_INET6);
230 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
231 break;
232 default:
233 dev->stats.tx_errors++;
234 dev_kfree_skb(skb);
235 return NETDEV_TX_OK;
236 }
237
Alexander Duyckcd5279c2015-05-27 07:16:43 -0700238 /* override mark with tunnel output key */
239 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
240
Steffen Klassert78a010c2014-02-21 08:41:10 +0100241 return vti_xmit(skb, dev, &fl);
242}
243
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100244static int vti4_err(struct sk_buff *skb, u32 info)
245{
246 __be32 spi;
Steffen Klassert6d004d62014-05-12 09:09:26 +0200247 __u32 mark;
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100248 struct xfrm_state *x;
249 struct ip_tunnel *tunnel;
250 struct ip_esp_hdr *esph;
251 struct ip_auth_hdr *ah ;
252 struct ip_comp_hdr *ipch;
253 struct net *net = dev_net(skb->dev);
254 const struct iphdr *iph = (const struct iphdr *)skb->data;
255 int protocol = iph->protocol;
256 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
257
258 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
259 iph->daddr, iph->saddr, 0);
260 if (!tunnel)
261 return -1;
262
Steffen Klassert6d004d62014-05-12 09:09:26 +0200263 mark = be32_to_cpu(tunnel->parms.o_key);
264
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100265 switch (protocol) {
266 case IPPROTO_ESP:
267 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
268 spi = esph->spi;
269 break;
270 case IPPROTO_AH:
271 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
272 spi = ah->spi;
273 break;
274 case IPPROTO_COMP:
275 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
276 spi = htonl(ntohs(ipch->cpi));
277 break;
278 default:
279 return 0;
280 }
281
282 switch (icmp_hdr(skb)->type) {
283 case ICMP_DEST_UNREACH:
284 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
285 return 0;
286 case ICMP_REDIRECT:
287 break;
288 default:
289 return 0;
290 }
291
Steffen Klassert6d004d62014-05-12 09:09:26 +0200292 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100293 spi, protocol, AF_INET);
294 if (!x)
295 return 0;
296
297 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
298 ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
299 else
300 ipv4_redirect(skb, net, 0, 0, protocol, 0);
301 xfrm_state_put(x);
302
303 return 0;
304}
305
Saurabh11814122012-07-17 09:44:54 +0000306static int
307vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
308{
309 int err = 0;
310 struct ip_tunnel_parm p;
Saurabh11814122012-07-17 09:44:54 +0000311
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800312 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
313 return -EFAULT;
Saurabh11814122012-07-17 09:44:54 +0000314
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800315 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
Saurabh11814122012-07-17 09:44:54 +0000316 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
317 p.iph.ihl != 5)
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800318 return -EINVAL;
Saurabh11814122012-07-17 09:44:54 +0000319 }
320
Dmitry Popov7c8e6b92014-06-08 02:06:25 +0400321 if (!(p.i_flags & GRE_KEY))
322 p.i_key = 0;
323 if (!(p.o_flags & GRE_KEY))
324 p.o_key = 0;
325
326 p.i_flags = VTI_ISVTI;
327
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800328 err = ip_tunnel_ioctl(dev, &p, cmd);
329 if (err)
330 return err;
Saurabh11814122012-07-17 09:44:54 +0000331
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800332 if (cmd != SIOCDELTUNNEL) {
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100333 p.i_flags |= GRE_KEY;
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800334 p.o_flags |= GRE_KEY;
335 }
336
337 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
338 return -EFAULT;
Saurabh11814122012-07-17 09:44:54 +0000339 return 0;
340}
341
342static const struct net_device_ops vti_netdev_ops = {
343 .ndo_init = vti_tunnel_init,
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800344 .ndo_uninit = ip_tunnel_uninit,
Saurabh11814122012-07-17 09:44:54 +0000345 .ndo_start_xmit = vti_tunnel_xmit,
346 .ndo_do_ioctl = vti_tunnel_ioctl,
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800347 .ndo_change_mtu = ip_tunnel_change_mtu,
Pravin B Shelarf61dd382013-03-25 14:50:00 +0000348 .ndo_get_stats64 = ip_tunnel_get_stats64,
Nicolas Dichtel1e995842015-04-02 17:07:02 +0200349 .ndo_get_iflink = ip_tunnel_get_iflink,
Saurabh11814122012-07-17 09:44:54 +0000350};
351
Saurabh11814122012-07-17 09:44:54 +0000352static void vti_tunnel_setup(struct net_device *dev)
353{
354 dev->netdev_ops = &vti_netdev_ops;
Nicolas Dichtel8d89dcd2014-04-11 15:51:19 +0200355 dev->type = ARPHRD_TUNNEL;
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800356 ip_tunnel_setup(dev, vti_net_id);
357}
358
359static int vti_tunnel_init(struct net_device *dev)
360{
361 struct ip_tunnel *tunnel = netdev_priv(dev);
362 struct iphdr *iph = &tunnel->parms.iph;
363
364 memcpy(dev->dev_addr, &iph->saddr, 4);
365 memcpy(dev->broadcast, &iph->daddr, 4);
Saurabh11814122012-07-17 09:44:54 +0000366
Saurabh11814122012-07-17 09:44:54 +0000367 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
368 dev->mtu = ETH_DATA_LEN;
369 dev->flags = IFF_NOARP;
Saurabh11814122012-07-17 09:44:54 +0000370 dev->addr_len = 4;
Saurabh11814122012-07-17 09:44:54 +0000371 dev->features |= NETIF_F_LLTX;
Eric Dumazet02875872014-10-05 18:38:35 -0700372 netif_keep_dst(dev);
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800373
374 return ip_tunnel_init(dev);
Saurabh11814122012-07-17 09:44:54 +0000375}
376
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800377static void __net_init vti_fb_tunnel_init(struct net_device *dev)
Saurabh11814122012-07-17 09:44:54 +0000378{
379 struct ip_tunnel *tunnel = netdev_priv(dev);
380 struct iphdr *iph = &tunnel->parms.iph;
Saurabh11814122012-07-17 09:44:54 +0000381
Saurabh11814122012-07-17 09:44:54 +0000382 iph->version = 4;
383 iph->protocol = IPPROTO_IPIP;
384 iph->ihl = 5;
Saurabh11814122012-07-17 09:44:54 +0000385}
386
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100387static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
Saurabh11814122012-07-17 09:44:54 +0000388 .handler = vti_rcv,
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100389 .input_handler = vti_input,
390 .cb_handler = vti_rcv_cb,
391 .err_handler = vti4_err,
392 .priority = 100,
393};
394
395static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
396 .handler = vti_rcv,
397 .input_handler = vti_input,
398 .cb_handler = vti_rcv_cb,
399 .err_handler = vti4_err,
400 .priority = 100,
401};
402
403static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
404 .handler = vti_rcv,
405 .input_handler = vti_input,
406 .cb_handler = vti_rcv_cb,
407 .err_handler = vti4_err,
408 .priority = 100,
Saurabh11814122012-07-17 09:44:54 +0000409};
410
Saurabh11814122012-07-17 09:44:54 +0000411static int __net_init vti_init_net(struct net *net)
412{
413 int err;
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800414 struct ip_tunnel_net *itn;
Saurabh11814122012-07-17 09:44:54 +0000415
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800416 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
Saurabh11814122012-07-17 09:44:54 +0000417 if (err)
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800418 return err;
419 itn = net_generic(net, vti_net_id);
420 vti_fb_tunnel_init(itn->fb_tunnel_dev);
Saurabh11814122012-07-17 09:44:54 +0000421 return 0;
Saurabh11814122012-07-17 09:44:54 +0000422}
423
424static void __net_exit vti_exit_net(struct net *net)
425{
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800426 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
Nicolas Dichtel6c742e72013-08-13 17:51:11 +0200427 ip_tunnel_delete_net(itn, &vti_link_ops);
Saurabh11814122012-07-17 09:44:54 +0000428}
429
430static struct pernet_operations vti_net_ops = {
431 .init = vti_init_net,
432 .exit = vti_exit_net,
433 .id = &vti_net_id,
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800434 .size = sizeof(struct ip_tunnel_net),
Saurabh11814122012-07-17 09:44:54 +0000435};
436
437static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
438{
439 return 0;
440}
441
442static void vti_netlink_parms(struct nlattr *data[],
443 struct ip_tunnel_parm *parms)
444{
445 memset(parms, 0, sizeof(*parms));
446
447 parms->iph.protocol = IPPROTO_IPIP;
448
449 if (!data)
450 return;
451
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100452 parms->i_flags = VTI_ISVTI;
453
Saurabh11814122012-07-17 09:44:54 +0000454 if (data[IFLA_VTI_LINK])
455 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
456
457 if (data[IFLA_VTI_IKEY])
458 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
459
460 if (data[IFLA_VTI_OKEY])
461 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
462
463 if (data[IFLA_VTI_LOCAL])
Jiri Benc67b61f62015-03-29 16:59:26 +0200464 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
Saurabh11814122012-07-17 09:44:54 +0000465
466 if (data[IFLA_VTI_REMOTE])
Jiri Benc67b61f62015-03-29 16:59:26 +0200467 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
Saurabh11814122012-07-17 09:44:54 +0000468
469}
470
471static int vti_newlink(struct net *src_net, struct net_device *dev,
472 struct nlattr *tb[], struct nlattr *data[])
473{
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800474 struct ip_tunnel_parm parms;
Saurabh11814122012-07-17 09:44:54 +0000475
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800476 vti_netlink_parms(data, &parms);
477 return ip_tunnel_newlink(dev, tb, &parms);
Saurabh11814122012-07-17 09:44:54 +0000478}
479
480static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
481 struct nlattr *data[])
482{
Saurabh11814122012-07-17 09:44:54 +0000483 struct ip_tunnel_parm p;
Saurabh11814122012-07-17 09:44:54 +0000484
Saurabh11814122012-07-17 09:44:54 +0000485 vti_netlink_parms(data, &p);
Amerigo Wangb9959fd2013-07-21 10:46:25 +0800486 return ip_tunnel_changelink(dev, tb, &p);
Saurabh11814122012-07-17 09:44:54 +0000487}
488
489static size_t vti_get_size(const struct net_device *dev)
490{
491 return
492 /* IFLA_VTI_LINK */
493 nla_total_size(4) +
494 /* IFLA_VTI_IKEY */
495 nla_total_size(4) +
496 /* IFLA_VTI_OKEY */
497 nla_total_size(4) +
498 /* IFLA_VTI_LOCAL */
499 nla_total_size(4) +
500 /* IFLA_VTI_REMOTE */
501 nla_total_size(4) +
502 0;
503}
504
505static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
506{
507 struct ip_tunnel *t = netdev_priv(dev);
508 struct ip_tunnel_parm *p = &t->parms;
509
510 nla_put_u32(skb, IFLA_VTI_LINK, p->link);
511 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key);
512 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key);
Jiri Benc930345e2015-03-29 16:59:25 +0200513 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr);
514 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr);
Saurabh11814122012-07-17 09:44:54 +0000515
516 return 0;
517}
518
519static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
520 [IFLA_VTI_LINK] = { .type = NLA_U32 },
521 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
522 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
523 [IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
524 [IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
525};
526
527static struct rtnl_link_ops vti_link_ops __read_mostly = {
528 .kind = "vti",
529 .maxtype = IFLA_VTI_MAX,
530 .policy = vti_policy,
531 .priv_size = sizeof(struct ip_tunnel),
532 .setup = vti_tunnel_setup,
533 .validate = vti_tunnel_validate,
534 .newlink = vti_newlink,
535 .changelink = vti_changelink,
lucien20ea60c2014-11-23 15:04:11 +0800536 .dellink = ip_tunnel_dellink,
Saurabh11814122012-07-17 09:44:54 +0000537 .get_size = vti_get_size,
538 .fill_info = vti_fill_info,
Nicolas Dichtel1728d4f2015-01-15 15:11:17 +0100539 .get_link_net = ip_tunnel_get_link_net,
Saurabh11814122012-07-17 09:44:54 +0000540};
541
542static int __init vti_init(void)
543{
Mathias Krause1990e4f2014-05-09 23:43:42 +0200544 const char *msg;
Saurabh11814122012-07-17 09:44:54 +0000545 int err;
546
Mathias Krause1990e4f2014-05-09 23:43:42 +0200547 pr_info("IPv4 over IPsec tunneling driver\n");
Saurabh11814122012-07-17 09:44:54 +0000548
Mathias Krause1990e4f2014-05-09 23:43:42 +0200549 msg = "tunnel device";
Saurabh11814122012-07-17 09:44:54 +0000550 err = register_pernet_device(&vti_net_ops);
551 if (err < 0)
Mathias Krause1990e4f2014-05-09 23:43:42 +0200552 goto pernet_dev_failed;
553
554 msg = "tunnel protocols";
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100555 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
Mathias Krause1990e4f2014-05-09 23:43:42 +0200556 if (err < 0)
557 goto xfrm_proto_esp_failed;
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100558 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
Mathias Krause1990e4f2014-05-09 23:43:42 +0200559 if (err < 0)
560 goto xfrm_proto_ah_failed;
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100561 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
Mathias Krause1990e4f2014-05-09 23:43:42 +0200562 if (err < 0)
563 goto xfrm_proto_comp_failed;
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100564
Mathias Krause1990e4f2014-05-09 23:43:42 +0200565 msg = "netlink interface";
Saurabh11814122012-07-17 09:44:54 +0000566 err = rtnl_link_register(&vti_link_ops);
567 if (err < 0)
568 goto rtnl_link_failed;
569
570 return err;
571
572rtnl_link_failed:
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100573 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
Mathias Krause1990e4f2014-05-09 23:43:42 +0200574xfrm_proto_comp_failed:
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100575 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
Mathias Krause1990e4f2014-05-09 23:43:42 +0200576xfrm_proto_ah_failed:
Steffen Klassertdf3893c2014-02-21 08:41:10 +0100577 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
Mathias Krause1990e4f2014-05-09 23:43:42 +0200578xfrm_proto_esp_failed:
Saurabh11814122012-07-17 09:44:54 +0000579 unregister_pernet_device(&vti_net_ops);
Mathias Krause1990e4f2014-05-09 23:43:42 +0200580pernet_dev_failed:
581 pr_err("vti init: failed to register %s\n", msg);
Saurabh11814122012-07-17 09:44:54 +0000582 return err;
583}
584
585static void __exit vti_fini(void)
586{
587 rtnl_link_unregister(&vti_link_ops);
Mathias Krause1990e4f2014-05-09 23:43:42 +0200588 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
589 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
590 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
Saurabh11814122012-07-17 09:44:54 +0000591 unregister_pernet_device(&vti_net_ops);
592}
593
594module_init(vti_init);
595module_exit(vti_fini);
596MODULE_LICENSE("GPL");
597MODULE_ALIAS_RTNL_LINK("vti");
598MODULE_ALIAS_NETDEV("ip_vti0");