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dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / net / ipv4 / ip_vti.c
blob4b7c81f88abf26c0539e017679ff4b3c551dd7cc
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/mroute.h>
34 #include <linux/init.h>
35 #include <linux/netfilter_ipv4.h>
36 #include <linux/if_ether.h>
37 #include <linux/icmpv6.h>
38
39 #include <net/sock.h>
40 #include <net/ip.h>
41 #include <net/icmp.h>
42 #include <net/ip_tunnels.h>
43 #include <net/inet_ecn.h>
44 #include <net/xfrm.h>
45 #include <net/net_namespace.h>
46 #include <net/netns/generic.h>
47
48 static struct rtnl_link_ops vti_link_ops __read_mostly;
49
50 static int vti_net_id __read_mostly;
51 static int vti_tunnel_init(struct net_device *dev);
52
53 static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
54 int encap_type)
55 {
56 struct ip_tunnel *tunnel;
57 const struct iphdr *iph = ip_hdr(skb);
58 struct net *net = dev_net(skb->dev);
59 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
60
61 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
62 iph->saddr, iph->daddr, 0);
63 if (tunnel) {
64 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
65 goto drop;
66
67 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
68
69 return xfrm_input(skb, nexthdr, spi, encap_type);
70 }
71
72 return -EINVAL;
73 drop:
74 kfree_skb(skb);
75 return 0;
76 }
77
78 static int vti_rcv(struct sk_buff *skb)
79 {
80 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
81 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
82
83 return vti_input(skb, ip_hdr(skb)->protocol, 0, 0);
84 }
85
86 static int vti_rcv_cb(struct sk_buff *skb, int err)
87 {
88 unsigned short family;
89 struct net_device *dev;
90 struct pcpu_sw_netstats *tstats;
91 struct xfrm_state *x;
92 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
93 u32 orig_mark = skb->mark;
94 int ret;
95
96 if (!tunnel)
97 return 1;
98
99 dev = tunnel->dev;
100
101 if (err) {
102 dev->stats.rx_errors++;
103 dev->stats.rx_dropped++;
104
105 return 0;
106 }
107
108 x = xfrm_input_state(skb);
109 family = x->inner_mode->afinfo->family;
110
111 skb->mark = be32_to_cpu(tunnel->parms.i_key);
112 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
113 skb->mark = orig_mark;
114
115 if (!ret)
116 return -EPERM;
117
118 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
119 skb->dev = dev;
120
121 tstats = this_cpu_ptr(dev->tstats);
122
123 u64_stats_update_begin(&tstats->syncp);
124 tstats->rx_packets++;
125 tstats->rx_bytes += skb->len;
126 u64_stats_update_end(&tstats->syncp);
127
128 return 0;
129 }
130
131 static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
132 {
133 xfrm_address_t *daddr = (xfrm_address_t *)&dst;
134 xfrm_address_t *saddr = (xfrm_address_t *)&src;
135
136 /* if there is no transform then this tunnel is not functional.
137 * Or if the xfrm is not mode tunnel.
138 */
139 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
140 x->props.family != AF_INET)
141 return false;
142
143 if (!dst)
144 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
145
146 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
147 return false;
148
149 return true;
150 }
151
152 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
153 struct flowi *fl)
154 {
155 struct ip_tunnel *tunnel = netdev_priv(dev);
156 struct ip_tunnel_parm *parms = &tunnel->parms;
157 struct dst_entry *dst = skb_dst(skb);
158 struct net_device *tdev; /* Device to other host */
159 int pkt_len = skb->len;
160 int err;
161
162 if (!dst) {
163 dev->stats.tx_carrier_errors++;
164 goto tx_error_icmp;
165 }
166
167 dst_hold(dst);
168 dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
169 if (IS_ERR(dst)) {
170 dev->stats.tx_carrier_errors++;
171 goto tx_error_icmp;
172 }
173
174 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
175 dev->stats.tx_carrier_errors++;
176 dst_release(dst);
177 goto tx_error_icmp;
178 }
179
180 tdev = dst->dev;
181
182 if (tdev == dev) {
183 dst_release(dst);
184 dev->stats.collisions++;
185 goto tx_error;
186 }
187
188 if (tunnel->err_count > 0) {
189 if (time_before(jiffies,
190 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
191 tunnel->err_count--;
192 dst_link_failure(skb);
193 } else
194 tunnel->err_count = 0;
195 }
196
197 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
198 skb_dst_set(skb, dst);
199 skb->dev = skb_dst(skb)->dev;
200
201 err = dst_output(tunnel->net, skb->sk, skb);
202 if (net_xmit_eval(err) == 0)
203 err = pkt_len;
204 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
205 return NETDEV_TX_OK;
206
207 tx_error_icmp:
208 dst_link_failure(skb);
209 tx_error:
210 dev->stats.tx_errors++;
211 kfree_skb(skb);
212 return NETDEV_TX_OK;
213 }
214
215 /* This function assumes it is being called from dev_queue_xmit()
216 * and that skb is filled properly by that function.
217 */
218 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
219 {
220 struct ip_tunnel *tunnel = netdev_priv(dev);
221 struct flowi fl;
222
223 memset(&fl, 0, sizeof(fl));
224
225 switch (skb->protocol) {
226 case htons(ETH_P_IP):
227 xfrm_decode_session(skb, &fl, AF_INET);
228 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
229 break;
230 case htons(ETH_P_IPV6):
231 xfrm_decode_session(skb, &fl, AF_INET6);
232 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
233 break;
234 default:
235 dev->stats.tx_errors++;
236 dev_kfree_skb(skb);
237 return NETDEV_TX_OK;
238 }
239
240 /* override mark with tunnel output key */
241 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
242
243 return vti_xmit(skb, dev, &fl);
244 }
245
246 static int vti4_err(struct sk_buff *skb, u32 info)
247 {
248 __be32 spi;
249 __u32 mark;
250 struct xfrm_state *x;
251 struct ip_tunnel *tunnel;
252 struct ip_esp_hdr *esph;
253 struct ip_auth_hdr *ah ;
254 struct ip_comp_hdr *ipch;
255 struct net *net = dev_net(skb->dev);
256 const struct iphdr *iph = (const struct iphdr *)skb->data;
257 int protocol = iph->protocol;
258 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
259
260 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
261 iph->daddr, iph->saddr, 0);
262 if (!tunnel)
263 return -1;
264
265 mark = be32_to_cpu(tunnel->parms.o_key);
266
267 switch (protocol) {
268 case IPPROTO_ESP:
269 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
270 spi = esph->spi;
271 break;
272 case IPPROTO_AH:
273 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
274 spi = ah->spi;
275 break;
276 case IPPROTO_COMP:
277 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
278 spi = htonl(ntohs(ipch->cpi));
279 break;
280 default:
281 return 0;
282 }
283
284 switch (icmp_hdr(skb)->type) {
285 case ICMP_DEST_UNREACH:
286 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
287 return 0;
288 case ICMP_REDIRECT:
289 break;
290 default:
291 return 0;
292 }
293
294 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
295 spi, protocol, AF_INET);
296 if (!x)
297 return 0;
298
299 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
300 ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
301 else
302 ipv4_redirect(skb, net, 0, 0, protocol, 0);
303 xfrm_state_put(x);
304
305 return 0;
306 }
307
308 static int
309 vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
310 {
311 int err = 0;
312 struct ip_tunnel_parm p;
313
314 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
315 return -EFAULT;
316
317 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
318 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
319 p.iph.ihl != 5)
320 return -EINVAL;
321 }
322
323 if (!(p.i_flags & GRE_KEY))
324 p.i_key = 0;
325 if (!(p.o_flags & GRE_KEY))
326 p.o_key = 0;
327
328 p.i_flags = VTI_ISVTI;
329
330 err = ip_tunnel_ioctl(dev, &p, cmd);
331 if (err)
332 return err;
333
334 if (cmd != SIOCDELTUNNEL) {
335 p.i_flags |= GRE_KEY;
336 p.o_flags |= GRE_KEY;
337 }
338
339 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
340 return -EFAULT;
341 return 0;
342 }
343
344 static const struct net_device_ops vti_netdev_ops = {
345 .ndo_init = vti_tunnel_init,
346 .ndo_uninit = ip_tunnel_uninit,
347 .ndo_start_xmit = vti_tunnel_xmit,
348 .ndo_do_ioctl = vti_tunnel_ioctl,
349 .ndo_change_mtu = ip_tunnel_change_mtu,
350 .ndo_get_stats64 = ip_tunnel_get_stats64,
351 .ndo_get_iflink = ip_tunnel_get_iflink,
352 };
353
354 static void vti_tunnel_setup(struct net_device *dev)
355 {
356 dev->netdev_ops = &vti_netdev_ops;
357 dev->type = ARPHRD_TUNNEL;
358 ip_tunnel_setup(dev, vti_net_id);
359 }
360
361 static int vti_tunnel_init(struct net_device *dev)
362 {
363 struct ip_tunnel *tunnel = netdev_priv(dev);
364 struct iphdr *iph = &tunnel->parms.iph;
365
366 memcpy(dev->dev_addr, &iph->saddr, 4);
367 memcpy(dev->broadcast, &iph->daddr, 4);
368
369 dev->mtu = ETH_DATA_LEN;
370 dev->flags = IFF_NOARP;
371 dev->addr_len = 4;
372 dev->features |= NETIF_F_LLTX;
373 netif_keep_dst(dev);
374
375 return ip_tunnel_init(dev);
376 }
377
378 static void __net_init vti_fb_tunnel_init(struct net_device *dev)
379 {
380 struct ip_tunnel *tunnel = netdev_priv(dev);
381 struct iphdr *iph = &tunnel->parms.iph;
382
383 iph->version = 4;
384 iph->protocol = IPPROTO_IPIP;
385 iph->ihl = 5;
386 }
387
388 static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
389 .handler = vti_rcv,
390 .input_handler = vti_input,
391 .cb_handler = vti_rcv_cb,
392 .err_handler = vti4_err,
393 .priority = 100,
394 };
395
396 static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
397 .handler = vti_rcv,
398 .input_handler = vti_input,
399 .cb_handler = vti_rcv_cb,
400 .err_handler = vti4_err,
401 .priority = 100,
402 };
403
404 static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
405 .handler = vti_rcv,
406 .input_handler = vti_input,
407 .cb_handler = vti_rcv_cb,
408 .err_handler = vti4_err,
409 .priority = 100,
410 };
411
412 static int __net_init vti_init_net(struct net *net)
413 {
414 int err;
415 struct ip_tunnel_net *itn;
416
417 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
418 if (err)
419 return err;
420 itn = net_generic(net, vti_net_id);
421 vti_fb_tunnel_init(itn->fb_tunnel_dev);
422 return 0;
423 }
424
425 static void __net_exit vti_exit_net(struct net *net)
426 {
427 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
428 ip_tunnel_delete_net(itn, &vti_link_ops);
429 }
430
431 static struct pernet_operations vti_net_ops = {
432 .init = vti_init_net,
433 .exit = vti_exit_net,
434 .id = &vti_net_id,
435 .size = sizeof(struct ip_tunnel_net),
436 };
437
438 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
439 {
440 return 0;
441 }
442
443 static void vti_netlink_parms(struct nlattr *data[],
444 struct ip_tunnel_parm *parms)
445 {
446 memset(parms, 0, sizeof(*parms));
447
448 parms->iph.protocol = IPPROTO_IPIP;
449
450 if (!data)
451 return;
452
453 parms->i_flags = VTI_ISVTI;
454
455 if (data[IFLA_VTI_LINK])
456 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
457
458 if (data[IFLA_VTI_IKEY])
459 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
460
461 if (data[IFLA_VTI_OKEY])
462 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
463
464 if (data[IFLA_VTI_LOCAL])
465 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
466
467 if (data[IFLA_VTI_REMOTE])
468 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
469
470 }
471
472 static int vti_newlink(struct net *src_net, struct net_device *dev,
473 struct nlattr *tb[], struct nlattr *data[])
474 {
475 struct ip_tunnel_parm parms;
476
477 vti_netlink_parms(data, &parms);
478 return ip_tunnel_newlink(dev, tb, &parms);
479 }
480
481 static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
482 struct nlattr *data[])
483 {
484 struct ip_tunnel_parm p;
485
486 vti_netlink_parms(data, &p);
487 return ip_tunnel_changelink(dev, tb, &p);
488 }
489
490 static size_t vti_get_size(const struct net_device *dev)
491 {
492 return
493 /* IFLA_VTI_LINK */
494 nla_total_size(4) +
495 /* IFLA_VTI_IKEY */
496 nla_total_size(4) +
497 /* IFLA_VTI_OKEY */
498 nla_total_size(4) +
499 /* IFLA_VTI_LOCAL */
500 nla_total_size(4) +
501 /* IFLA_VTI_REMOTE */
502 nla_total_size(4) +
503 0;
504 }
505
506 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
507 {
508 struct ip_tunnel *t = netdev_priv(dev);
509 struct ip_tunnel_parm *p = &t->parms;
510
511 nla_put_u32(skb, IFLA_VTI_LINK, p->link);
512 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key);
513 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key);
514 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr);
515 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr);
516
517 return 0;
518 }
519
520 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
521 [IFLA_VTI_LINK] = { .type = NLA_U32 },
522 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
523 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
524 [IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
525 [IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
526 };
527
528 static struct rtnl_link_ops vti_link_ops __read_mostly = {
529 .kind = "vti",
530 .maxtype = IFLA_VTI_MAX,
531 .policy = vti_policy,
532 .priv_size = sizeof(struct ip_tunnel),
533 .setup = vti_tunnel_setup,
534 .validate = vti_tunnel_validate,
535 .newlink = vti_newlink,
536 .changelink = vti_changelink,
537 .dellink = ip_tunnel_dellink,
538 .get_size = vti_get_size,
539 .fill_info = vti_fill_info,
540 .get_link_net = ip_tunnel_get_link_net,
541 };
542
543 static bool is_vti_tunnel(const struct net_device *dev)
544 {
545 return dev->netdev_ops == &vti_netdev_ops;
546 }
547
548 static int vti_device_event(struct notifier_block *unused,
549 unsigned long event, void *ptr)
550 {
551 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
552 struct ip_tunnel *tunnel = netdev_priv(dev);
553
554 if (!is_vti_tunnel(dev))
555 return NOTIFY_DONE;
556
557 switch (event) {
558 case NETDEV_DOWN:
559 if (!net_eq(tunnel->net, dev_net(dev)))
560 xfrm_garbage_collect(tunnel->net);
561 break;
562 }
563 return NOTIFY_DONE;
564 }
565
566 static struct notifier_block vti_notifier_block __read_mostly = {
567 .notifier_call = vti_device_event,
568 };
569
570 static int __init vti_init(void)
571 {
572 const char *msg;
573 int err;
574
575 pr_info("IPv4 over IPsec tunneling driver\n");
576
577 register_netdevice_notifier(&vti_notifier_block);
578
579 msg = "tunnel device";
580 err = register_pernet_device(&vti_net_ops);
581 if (err < 0)
582 goto pernet_dev_failed;
583
584 msg = "tunnel protocols";
585 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
586 if (err < 0)
587 goto xfrm_proto_esp_failed;
588 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
589 if (err < 0)
590 goto xfrm_proto_ah_failed;
591 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
592 if (err < 0)
593 goto xfrm_proto_comp_failed;
594
595 msg = "netlink interface";
596 err = rtnl_link_register(&vti_link_ops);
597 if (err < 0)
598 goto rtnl_link_failed;
599
600 return err;
601
602 rtnl_link_failed:
603 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
604 xfrm_proto_comp_failed:
605 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
606 xfrm_proto_ah_failed:
607 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
608 xfrm_proto_esp_failed:
609 unregister_pernet_device(&vti_net_ops);
610 pernet_dev_failed:
611 unregister_netdevice_notifier(&vti_notifier_block);
612 pr_err("vti init: failed to register %s\n", msg);
613 return err;
614 }
615
616 static void __exit vti_fini(void)
617 {
618 rtnl_link_unregister(&vti_link_ops);
619 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
620 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
621 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
622 unregister_pernet_device(&vti_net_ops);
623 unregister_netdevice_notifier(&vti_notifier_block);
624 }
625
626 module_init(vti_init);
627 module_exit(vti_fini);
628 MODULE_LICENSE("GPL");
629 MODULE_ALIAS_RTNL_LINK("vti");
630 MODULE_ALIAS_NETDEV("ip_vti0");
Linux with added FPC-III support