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net: remove unnecessary mroute.h includes
[linux/fpc-iii.git] / net / ipv4 / ip_vti.c
blob02d9c21e2953b86179ea4a0ddcd9a3fb95bc9c63
1 /*
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/init.h>
34 #include <linux/netfilter_ipv4.h>
35 #include <linux/if_ether.h>
36 #include <linux/icmpv6.h>
37
38 #include <net/sock.h>
39 #include <net/ip.h>
40 #include <net/icmp.h>
41 #include <net/ip_tunnels.h>
42 #include <net/inet_ecn.h>
43 #include <net/xfrm.h>
44 #include <net/net_namespace.h>
45 #include <net/netns/generic.h>
46
47 static struct rtnl_link_ops vti_link_ops __read_mostly;
48
49 static int vti_net_id __read_mostly;
50 static int vti_tunnel_init(struct net_device *dev);
51
52 static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
53 int encap_type)
54 {
55 struct ip_tunnel *tunnel;
56 const struct iphdr *iph = ip_hdr(skb);
57 struct net *net = dev_net(skb->dev);
58 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
59
60 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
61 iph->saddr, iph->daddr, 0);
62 if (tunnel) {
63 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
64 goto drop;
65
66 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
67
68 return xfrm_input(skb, nexthdr, spi, encap_type);
69 }
70
71 return -EINVAL;
72 drop:
73 kfree_skb(skb);
74 return 0;
75 }
76
77 static 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
85 static 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;
92 u32 orig_mark = skb->mark;
93 int ret;
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 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)
115 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;
128 }
129
130 static 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
151 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
152 struct flowi *fl)
153 {
154 struct ip_tunnel *tunnel = netdev_priv(dev);
155 struct ip_tunnel_parm *parms = &tunnel->parms;
156 struct dst_entry *dst = skb_dst(skb);
157 struct net_device *tdev; /* Device to other host */
158 int err;
159
160 if (!dst) {
161 dev->stats.tx_carrier_errors++;
162 goto tx_error_icmp;
163 }
164
165 dst_hold(dst);
166 dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
167 if (IS_ERR(dst)) {
168 dev->stats.tx_carrier_errors++;
169 goto tx_error_icmp;
170 }
171
172 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
173 dev->stats.tx_carrier_errors++;
174 dst_release(dst);
175 goto tx_error_icmp;
176 }
177
178 tdev = dst->dev;
179
180 if (tdev == dev) {
181 dst_release(dst);
182 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
195 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
196 skb_dst_set(skb, dst);
197 skb->dev = skb_dst(skb)->dev;
198
199 err = dst_output(tunnel->net, skb->sk, skb);
200 if (net_xmit_eval(err) == 0)
201 err = skb->len;
202 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
203 return NETDEV_TX_OK;
204
205 tx_error_icmp:
206 dst_link_failure(skb);
207 tx_error:
208 dev->stats.tx_errors++;
209 kfree_skb(skb);
210 return NETDEV_TX_OK;
211 }
212
213 /* This function assumes it is being called from dev_queue_xmit()
214 * and that skb is filled properly by that function.
215 */
216 static 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
223 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
238 /* override mark with tunnel output key */
239 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
240
241 return vti_xmit(skb, dev, &fl);
242 }
243
244 static int vti4_err(struct sk_buff *skb, u32 info)
245 {
246 __be32 spi;
247 __u32 mark;
248 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
263 mark = be32_to_cpu(tunnel->parms.o_key);
264
265 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
292 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
293 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
306 static int
307 vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
308 {
309 int err = 0;
310 struct ip_tunnel_parm p;
311
312 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
313 return -EFAULT;
314
315 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
316 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
317 p.iph.ihl != 5)
318 return -EINVAL;
319 }
320
321 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
328 err = ip_tunnel_ioctl(dev, &p, cmd);
329 if (err)
330 return err;
331
332 if (cmd != SIOCDELTUNNEL) {
333 p.i_flags |= GRE_KEY;
334 p.o_flags |= GRE_KEY;
335 }
336
337 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
338 return -EFAULT;
339 return 0;
340 }
341
342 static const struct net_device_ops vti_netdev_ops = {
343 .ndo_init = vti_tunnel_init,
344 .ndo_uninit = ip_tunnel_uninit,
345 .ndo_start_xmit = vti_tunnel_xmit,
346 .ndo_do_ioctl = vti_tunnel_ioctl,
347 .ndo_change_mtu = ip_tunnel_change_mtu,
348 .ndo_get_stats64 = ip_tunnel_get_stats64,
349 .ndo_get_iflink = ip_tunnel_get_iflink,
350 };
351
352 static void vti_tunnel_setup(struct net_device *dev)
353 {
354 dev->netdev_ops = &vti_netdev_ops;
355 dev->type = ARPHRD_TUNNEL;
356 ip_tunnel_setup(dev, vti_net_id);
357 }
358
359 static 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);
366
367 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
368 dev->mtu = ETH_DATA_LEN;
369 dev->flags = IFF_NOARP;
370 dev->addr_len = 4;
371 dev->features |= NETIF_F_LLTX;
372 netif_keep_dst(dev);
373
374 return ip_tunnel_init(dev);
375 }
376
377 static void __net_init vti_fb_tunnel_init(struct net_device *dev)
378 {
379 struct ip_tunnel *tunnel = netdev_priv(dev);
380 struct iphdr *iph = &tunnel->parms.iph;
381
382 iph->version = 4;
383 iph->protocol = IPPROTO_IPIP;
384 iph->ihl = 5;
385 }
386
387 static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
388 .handler = vti_rcv,
389 .input_handler = vti_input,
390 .cb_handler = vti_rcv_cb,
391 .err_handler = vti4_err,
392 .priority = 100,
393 };
394
395 static 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
403 static 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,
409 };
410
411 static int __net_init vti_init_net(struct net *net)
412 {
413 int err;
414 struct ip_tunnel_net *itn;
415
416 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
417 if (err)
418 return err;
419 itn = net_generic(net, vti_net_id);
420 vti_fb_tunnel_init(itn->fb_tunnel_dev);
421 return 0;
422 }
423
424 static void __net_exit vti_exit_net(struct net *net)
425 {
426 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
427 ip_tunnel_delete_net(itn, &vti_link_ops);
428 }
429
430 static struct pernet_operations vti_net_ops = {
431 .init = vti_init_net,
432 .exit = vti_exit_net,
433 .id = &vti_net_id,
434 .size = sizeof(struct ip_tunnel_net),
435 };
436
437 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
438 {
439 return 0;
440 }
441
442 static 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
452 parms->i_flags = VTI_ISVTI;
453
454 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])
464 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
465
466 if (data[IFLA_VTI_REMOTE])
467 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
468
469 }
470
471 static int vti_newlink(struct net *src_net, struct net_device *dev,
472 struct nlattr *tb[], struct nlattr *data[])
473 {
474 struct ip_tunnel_parm parms;
475
476 vti_netlink_parms(data, &parms);
477 return ip_tunnel_newlink(dev, tb, &parms);
478 }
479
480 static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
481 struct nlattr *data[])
482 {
483 struct ip_tunnel_parm p;
484
485 vti_netlink_parms(data, &p);
486 return ip_tunnel_changelink(dev, tb, &p);
487 }
488
489 static 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
505 static 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);
513 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr);
514 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr);
515
516 return 0;
517 }
518
519 static 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
527 static 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,
536 .dellink = ip_tunnel_dellink,
537 .get_size = vti_get_size,
538 .fill_info = vti_fill_info,
539 .get_link_net = ip_tunnel_get_link_net,
540 };
541
542 static int __init vti_init(void)
543 {
544 const char *msg;
545 int err;
546
547 pr_info("IPv4 over IPsec tunneling driver\n");
548
549 msg = "tunnel device";
550 err = register_pernet_device(&vti_net_ops);
551 if (err < 0)
552 goto pernet_dev_failed;
553
554 msg = "tunnel protocols";
555 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
556 if (err < 0)
557 goto xfrm_proto_esp_failed;
558 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
559 if (err < 0)
560 goto xfrm_proto_ah_failed;
561 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
562 if (err < 0)
563 goto xfrm_proto_comp_failed;
564
565 msg = "netlink interface";
566 err = rtnl_link_register(&vti_link_ops);
567 if (err < 0)
568 goto rtnl_link_failed;
569
570 return err;
571
572 rtnl_link_failed:
573 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
574 xfrm_proto_comp_failed:
575 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
576 xfrm_proto_ah_failed:
577 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
578 xfrm_proto_esp_failed:
579 unregister_pernet_device(&vti_net_ops);
580 pernet_dev_failed:
581 pr_err("vti init: failed to register %s\n", msg);
582 return err;
583 }
584
585 static void __exit vti_fini(void)
586 {
587 rtnl_link_unregister(&vti_link_ops);
588 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);
591 unregister_pernet_device(&vti_net_ops);
592 }
593
594 module_init(vti_init);
595 module_exit(vti_fini);
596 MODULE_LICENSE("GPL");
597 MODULE_ALIAS_RTNL_LINK("vti");
598 MODULE_ALIAS_NETDEV("ip_vti0");
Linux with added FPC-III support