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x86/speculation/mds: Fix documentation typo
[linux/fpc-iii.git] / net / ipv4 / ip_vti.c
blob306603a7f35145c6521e3f9b9cf754416be340d1
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 unsigned 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_input_ipip(struct sk_buff *skb, int nexthdr, __be32 spi,
78 int encap_type)
79 {
80 struct ip_tunnel *tunnel;
81 const struct iphdr *iph = ip_hdr(skb);
82 struct net *net = dev_net(skb->dev);
83 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
84
85 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
86 iph->saddr, iph->daddr, 0);
87 if (tunnel) {
88 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
89 goto drop;
90
91 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
92
93 skb->dev = tunnel->dev;
94
95 return xfrm_input(skb, nexthdr, spi, encap_type);
96 }
97
98 return -EINVAL;
99 drop:
100 kfree_skb(skb);
101 return 0;
102 }
103
104 static int vti_rcv(struct sk_buff *skb)
105 {
106 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
107 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
108
109 return vti_input(skb, ip_hdr(skb)->protocol, 0, 0);
110 }
111
112 static int vti_rcv_ipip(struct sk_buff *skb)
113 {
114 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
115 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
116
117 return vti_input_ipip(skb, ip_hdr(skb)->protocol, ip_hdr(skb)->saddr, 0);
118 }
119
120 static int vti_rcv_cb(struct sk_buff *skb, int err)
121 {
122 unsigned short family;
123 struct net_device *dev;
124 struct pcpu_sw_netstats *tstats;
125 struct xfrm_state *x;
126 struct xfrm_mode *inner_mode;
127 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
128 u32 orig_mark = skb->mark;
129 int ret;
130
131 if (!tunnel)
132 return 1;
133
134 dev = tunnel->dev;
135
136 if (err) {
137 dev->stats.rx_errors++;
138 dev->stats.rx_dropped++;
139
140 return 0;
141 }
142
143 x = xfrm_input_state(skb);
144
145 inner_mode = x->inner_mode;
146
147 if (x->sel.family == AF_UNSPEC) {
148 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
149 if (inner_mode == NULL) {
150 XFRM_INC_STATS(dev_net(skb->dev),
151 LINUX_MIB_XFRMINSTATEMODEERROR);
152 return -EINVAL;
153 }
154 }
155
156 family = inner_mode->afinfo->family;
157
158 skb->mark = be32_to_cpu(tunnel->parms.i_key);
159 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
160 skb->mark = orig_mark;
161
162 if (!ret)
163 return -EPERM;
164
165 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
166 skb->dev = dev;
167
168 tstats = this_cpu_ptr(dev->tstats);
169
170 u64_stats_update_begin(&tstats->syncp);
171 tstats->rx_packets++;
172 tstats->rx_bytes += skb->len;
173 u64_stats_update_end(&tstats->syncp);
174
175 return 0;
176 }
177
178 static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
179 {
180 xfrm_address_t *daddr = (xfrm_address_t *)&dst;
181 xfrm_address_t *saddr = (xfrm_address_t *)&src;
182
183 /* if there is no transform then this tunnel is not functional.
184 * Or if the xfrm is not mode tunnel.
185 */
186 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
187 x->props.family != AF_INET)
188 return false;
189
190 if (!dst)
191 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
192
193 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
194 return false;
195
196 return true;
197 }
198
199 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
200 struct flowi *fl)
201 {
202 struct ip_tunnel *tunnel = netdev_priv(dev);
203 struct ip_tunnel_parm *parms = &tunnel->parms;
204 struct dst_entry *dst = skb_dst(skb);
205 struct net_device *tdev; /* Device to other host */
206 int pkt_len = skb->len;
207 int err;
208 int mtu;
209
210 if (!dst) {
211 dev->stats.tx_carrier_errors++;
212 goto tx_error_icmp;
213 }
214
215 dst_hold(dst);
216 dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
217 if (IS_ERR(dst)) {
218 dev->stats.tx_carrier_errors++;
219 goto tx_error_icmp;
220 }
221
222 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
223 dev->stats.tx_carrier_errors++;
224 dst_release(dst);
225 goto tx_error_icmp;
226 }
227
228 tdev = dst->dev;
229
230 if (tdev == dev) {
231 dst_release(dst);
232 dev->stats.collisions++;
233 goto tx_error;
234 }
235
236 if (tunnel->err_count > 0) {
237 if (time_before(jiffies,
238 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
239 tunnel->err_count--;
240 dst_link_failure(skb);
241 } else
242 tunnel->err_count = 0;
243 }
244
245 mtu = dst_mtu(dst);
246 if (skb->len > mtu) {
247 skb_dst_update_pmtu(skb, mtu);
248 if (skb->protocol == htons(ETH_P_IP)) {
249 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
250 htonl(mtu));
251 } else {
252 if (mtu < IPV6_MIN_MTU)
253 mtu = IPV6_MIN_MTU;
254
255 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
256 }
257
258 dst_release(dst);
259 goto tx_error;
260 }
261
262 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
263 skb_dst_set(skb, dst);
264 skb->dev = skb_dst(skb)->dev;
265
266 err = dst_output(tunnel->net, skb->sk, skb);
267 if (net_xmit_eval(err) == 0)
268 err = pkt_len;
269 iptunnel_xmit_stats(dev, err);
270 return NETDEV_TX_OK;
271
272 tx_error_icmp:
273 dst_link_failure(skb);
274 tx_error:
275 dev->stats.tx_errors++;
276 kfree_skb(skb);
277 return NETDEV_TX_OK;
278 }
279
280 /* This function assumes it is being called from dev_queue_xmit()
281 * and that skb is filled properly by that function.
282 */
283 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
284 {
285 struct ip_tunnel *tunnel = netdev_priv(dev);
286 struct flowi fl;
287
288 memset(&fl, 0, sizeof(fl));
289
290 switch (skb->protocol) {
291 case htons(ETH_P_IP):
292 xfrm_decode_session(skb, &fl, AF_INET);
293 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
294 break;
295 case htons(ETH_P_IPV6):
296 xfrm_decode_session(skb, &fl, AF_INET6);
297 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
298 break;
299 default:
300 dev->stats.tx_errors++;
301 dev_kfree_skb(skb);
302 return NETDEV_TX_OK;
303 }
304
305 /* override mark with tunnel output key */
306 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
307
308 return vti_xmit(skb, dev, &fl);
309 }
310
311 static int vti4_err(struct sk_buff *skb, u32 info)
312 {
313 __be32 spi;
314 __u32 mark;
315 struct xfrm_state *x;
316 struct ip_tunnel *tunnel;
317 struct ip_esp_hdr *esph;
318 struct ip_auth_hdr *ah ;
319 struct ip_comp_hdr *ipch;
320 struct net *net = dev_net(skb->dev);
321 const struct iphdr *iph = (const struct iphdr *)skb->data;
322 int protocol = iph->protocol;
323 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
324
325 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
326 iph->daddr, iph->saddr, 0);
327 if (!tunnel)
328 return -1;
329
330 mark = be32_to_cpu(tunnel->parms.o_key);
331
332 switch (protocol) {
333 case IPPROTO_ESP:
334 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
335 spi = esph->spi;
336 break;
337 case IPPROTO_AH:
338 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
339 spi = ah->spi;
340 break;
341 case IPPROTO_COMP:
342 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
343 spi = htonl(ntohs(ipch->cpi));
344 break;
345 default:
346 return 0;
347 }
348
349 switch (icmp_hdr(skb)->type) {
350 case ICMP_DEST_UNREACH:
351 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
352 return 0;
353 case ICMP_REDIRECT:
354 break;
355 default:
356 return 0;
357 }
358
359 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
360 spi, protocol, AF_INET);
361 if (!x)
362 return 0;
363
364 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
365 ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
366 else
367 ipv4_redirect(skb, net, 0, 0, protocol, 0);
368 xfrm_state_put(x);
369
370 return 0;
371 }
372
373 static int
374 vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
375 {
376 int err = 0;
377 struct ip_tunnel_parm p;
378
379 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
380 return -EFAULT;
381
382 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
383 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
384 p.iph.ihl != 5)
385 return -EINVAL;
386 }
387
388 if (!(p.i_flags & GRE_KEY))
389 p.i_key = 0;
390 if (!(p.o_flags & GRE_KEY))
391 p.o_key = 0;
392
393 p.i_flags = VTI_ISVTI;
394
395 err = ip_tunnel_ioctl(dev, &p, cmd);
396 if (err)
397 return err;
398
399 if (cmd != SIOCDELTUNNEL) {
400 p.i_flags |= GRE_KEY;
401 p.o_flags |= GRE_KEY;
402 }
403
404 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
405 return -EFAULT;
406 return 0;
407 }
408
409 static const struct net_device_ops vti_netdev_ops = {
410 .ndo_init = vti_tunnel_init,
411 .ndo_uninit = ip_tunnel_uninit,
412 .ndo_start_xmit = vti_tunnel_xmit,
413 .ndo_do_ioctl = vti_tunnel_ioctl,
414 .ndo_change_mtu = ip_tunnel_change_mtu,
415 .ndo_get_stats64 = ip_tunnel_get_stats64,
416 .ndo_get_iflink = ip_tunnel_get_iflink,
417 };
418
419 static void vti_tunnel_setup(struct net_device *dev)
420 {
421 dev->netdev_ops = &vti_netdev_ops;
422 dev->type = ARPHRD_TUNNEL;
423 ip_tunnel_setup(dev, vti_net_id);
424 }
425
426 static int vti_tunnel_init(struct net_device *dev)
427 {
428 struct ip_tunnel *tunnel = netdev_priv(dev);
429 struct iphdr *iph = &tunnel->parms.iph;
430
431 memcpy(dev->dev_addr, &iph->saddr, 4);
432 memcpy(dev->broadcast, &iph->daddr, 4);
433
434 dev->mtu = ETH_DATA_LEN;
435 dev->flags = IFF_NOARP;
436 dev->addr_len = 4;
437 dev->features |= NETIF_F_LLTX;
438 netif_keep_dst(dev);
439
440 return ip_tunnel_init(dev);
441 }
442
443 static void __net_init vti_fb_tunnel_init(struct net_device *dev)
444 {
445 struct ip_tunnel *tunnel = netdev_priv(dev);
446 struct iphdr *iph = &tunnel->parms.iph;
447
448 iph->version = 4;
449 iph->protocol = IPPROTO_IPIP;
450 iph->ihl = 5;
451 }
452
453 static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
454 .handler = vti_rcv,
455 .input_handler = vti_input,
456 .cb_handler = vti_rcv_cb,
457 .err_handler = vti4_err,
458 .priority = 100,
459 };
460
461 static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
462 .handler = vti_rcv,
463 .input_handler = vti_input,
464 .cb_handler = vti_rcv_cb,
465 .err_handler = vti4_err,
466 .priority = 100,
467 };
468
469 static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
470 .handler = vti_rcv,
471 .input_handler = vti_input,
472 .cb_handler = vti_rcv_cb,
473 .err_handler = vti4_err,
474 .priority = 100,
475 };
476
477 static struct xfrm_tunnel ipip_handler __read_mostly = {
478 .handler = vti_rcv_ipip,
479 .err_handler = vti4_err,
480 .priority = 0,
481 };
482
483 static int __net_init vti_init_net(struct net *net)
484 {
485 int err;
486 struct ip_tunnel_net *itn;
487
488 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
489 if (err)
490 return err;
491 itn = net_generic(net, vti_net_id);
492 vti_fb_tunnel_init(itn->fb_tunnel_dev);
493 return 0;
494 }
495
496 static void __net_exit vti_exit_net(struct net *net)
497 {
498 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
499 ip_tunnel_delete_net(itn, &vti_link_ops);
500 }
501
502 static struct pernet_operations vti_net_ops = {
503 .init = vti_init_net,
504 .exit = vti_exit_net,
505 .id = &vti_net_id,
506 .size = sizeof(struct ip_tunnel_net),
507 };
508
509 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
510 struct netlink_ext_ack *extack)
511 {
512 return 0;
513 }
514
515 static void vti_netlink_parms(struct nlattr *data[],
516 struct ip_tunnel_parm *parms,
517 __u32 *fwmark)
518 {
519 memset(parms, 0, sizeof(*parms));
520
521 parms->iph.protocol = IPPROTO_IPIP;
522
523 if (!data)
524 return;
525
526 parms->i_flags = VTI_ISVTI;
527
528 if (data[IFLA_VTI_LINK])
529 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
530
531 if (data[IFLA_VTI_IKEY])
532 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
533
534 if (data[IFLA_VTI_OKEY])
535 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
536
537 if (data[IFLA_VTI_LOCAL])
538 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
539
540 if (data[IFLA_VTI_REMOTE])
541 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
542
543 if (data[IFLA_VTI_FWMARK])
544 *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
545 }
546
547 static int vti_newlink(struct net *src_net, struct net_device *dev,
548 struct nlattr *tb[], struct nlattr *data[],
549 struct netlink_ext_ack *extack)
550 {
551 struct ip_tunnel_parm parms;
552 __u32 fwmark = 0;
553
554 vti_netlink_parms(data, &parms, &fwmark);
555 return ip_tunnel_newlink(dev, tb, &parms, fwmark);
556 }
557
558 static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
559 struct nlattr *data[],
560 struct netlink_ext_ack *extack)
561 {
562 struct ip_tunnel *t = netdev_priv(dev);
563 __u32 fwmark = t->fwmark;
564 struct ip_tunnel_parm p;
565
566 vti_netlink_parms(data, &p, &fwmark);
567 return ip_tunnel_changelink(dev, tb, &p, fwmark);
568 }
569
570 static size_t vti_get_size(const struct net_device *dev)
571 {
572 return
573 /* IFLA_VTI_LINK */
574 nla_total_size(4) +
575 /* IFLA_VTI_IKEY */
576 nla_total_size(4) +
577 /* IFLA_VTI_OKEY */
578 nla_total_size(4) +
579 /* IFLA_VTI_LOCAL */
580 nla_total_size(4) +
581 /* IFLA_VTI_REMOTE */
582 nla_total_size(4) +
583 /* IFLA_VTI_FWMARK */
584 nla_total_size(4) +
585 0;
586 }
587
588 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
589 {
590 struct ip_tunnel *t = netdev_priv(dev);
591 struct ip_tunnel_parm *p = &t->parms;
592
593 if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) ||
594 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) ||
595 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) ||
596 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) ||
597 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) ||
598 nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark))
599 return -EMSGSIZE;
600
601 return 0;
602 }
603
604 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
605 [IFLA_VTI_LINK] = { .type = NLA_U32 },
606 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
607 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
608 [IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
609 [IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
610 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
611 };
612
613 static struct rtnl_link_ops vti_link_ops __read_mostly = {
614 .kind = "vti",
615 .maxtype = IFLA_VTI_MAX,
616 .policy = vti_policy,
617 .priv_size = sizeof(struct ip_tunnel),
618 .setup = vti_tunnel_setup,
619 .validate = vti_tunnel_validate,
620 .newlink = vti_newlink,
621 .changelink = vti_changelink,
622 .dellink = ip_tunnel_dellink,
623 .get_size = vti_get_size,
624 .fill_info = vti_fill_info,
625 .get_link_net = ip_tunnel_get_link_net,
626 };
627
628 static int __init vti_init(void)
629 {
630 const char *msg;
631 int err;
632
633 pr_info("IPv4 over IPsec tunneling driver\n");
634
635 msg = "tunnel device";
636 err = register_pernet_device(&vti_net_ops);
637 if (err < 0)
638 goto pernet_dev_failed;
639
640 msg = "tunnel protocols";
641 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
642 if (err < 0)
643 goto xfrm_proto_esp_failed;
644 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
645 if (err < 0)
646 goto xfrm_proto_ah_failed;
647 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
648 if (err < 0)
649 goto xfrm_proto_comp_failed;
650
651 msg = "ipip tunnel";
652 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
653 if (err < 0) {
654 pr_info("%s: cant't register tunnel\n",__func__);
655 goto xfrm_tunnel_failed;
656 }
657
658 msg = "netlink interface";
659 err = rtnl_link_register(&vti_link_ops);
660 if (err < 0)
661 goto rtnl_link_failed;
662
663 return err;
664
665 rtnl_link_failed:
666 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
667 xfrm_tunnel_failed:
668 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
669 xfrm_proto_comp_failed:
670 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
671 xfrm_proto_ah_failed:
672 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
673 xfrm_proto_esp_failed:
674 unregister_pernet_device(&vti_net_ops);
675 pernet_dev_failed:
676 pr_err("vti init: failed to register %s\n", msg);
677 return err;
678 }
679
680 static void __exit vti_fini(void)
681 {
682 rtnl_link_unregister(&vti_link_ops);
683 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
684 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
685 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
686 unregister_pernet_device(&vti_net_ops);
687 }
688
689 module_init(vti_init);
690 module_exit(vti_fini);
691 MODULE_LICENSE("GPL");
692 MODULE_ALIAS_RTNL_LINK("vti");
693 MODULE_ALIAS_NETDEV("ip_vti0");
Linux with added FPC-III support