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Merge tag 'io_uring-5.11-2021-01-16' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / net / ipv4 / ip_vti.c
blobabc171e79d3e4f755182be054a6f948e20903c2d
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Linux NET3: IP/IP protocol decoder modified to support
4 * virtual tunnel interface
5 *
6 * Authors:
7 * Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012
8 */
9
10 /*
11 This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c
12
13 For comments look at net/ipv4/ip_gre.c --ANK
14 */
15
16
17 #include <linux/capability.h>
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/kernel.h>
21 #include <linux/uaccess.h>
22 #include <linux/skbuff.h>
23 #include <linux/netdevice.h>
24 #include <linux/in.h>
25 #include <linux/tcp.h>
26 #include <linux/udp.h>
27 #include <linux/if_arp.h>
28 #include <linux/init.h>
29 #include <linux/netfilter_ipv4.h>
30 #include <linux/if_ether.h>
31 #include <linux/icmpv6.h>
32
33 #include <net/sock.h>
34 #include <net/ip.h>
35 #include <net/icmp.h>
36 #include <net/ip_tunnels.h>
37 #include <net/inet_ecn.h>
38 #include <net/xfrm.h>
39 #include <net/net_namespace.h>
40 #include <net/netns/generic.h>
41
42 static struct rtnl_link_ops vti_link_ops __read_mostly;
43
44 static unsigned int vti_net_id __read_mostly;
45 static int vti_tunnel_init(struct net_device *dev);
46
47 static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
48 int encap_type, bool update_skb_dev)
49 {
50 struct ip_tunnel *tunnel;
51 const struct iphdr *iph = ip_hdr(skb);
52 struct net *net = dev_net(skb->dev);
53 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
54
55 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
56 iph->saddr, iph->daddr, 0);
57 if (tunnel) {
58 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
59 goto drop;
60
61 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
62
63 if (update_skb_dev)
64 skb->dev = tunnel->dev;
65
66 return xfrm_input(skb, nexthdr, spi, encap_type);
67 }
68
69 return -EINVAL;
70 drop:
71 kfree_skb(skb);
72 return 0;
73 }
74
75 static int vti_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
76 int encap_type)
77 {
78 return vti_input(skb, nexthdr, spi, encap_type, false);
79 }
80
81 static int vti_rcv(struct sk_buff *skb, __be32 spi, bool update_skb_dev)
82 {
83 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
84 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
85
86 return vti_input(skb, ip_hdr(skb)->protocol, spi, 0, update_skb_dev);
87 }
88
89 static int vti_rcv_proto(struct sk_buff *skb)
90 {
91 return vti_rcv(skb, 0, false);
92 }
93
94 static int vti_rcv_cb(struct sk_buff *skb, int err)
95 {
96 unsigned short family;
97 struct net_device *dev;
98 struct xfrm_state *x;
99 const struct xfrm_mode *inner_mode;
100 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
101 u32 orig_mark = skb->mark;
102 int ret;
103
104 if (!tunnel)
105 return 1;
106
107 dev = tunnel->dev;
108
109 if (err) {
110 dev->stats.rx_errors++;
111 dev->stats.rx_dropped++;
112
113 return 0;
114 }
115
116 x = xfrm_input_state(skb);
117
118 inner_mode = &x->inner_mode;
119
120 if (x->sel.family == AF_UNSPEC) {
121 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
122 if (inner_mode == NULL) {
123 XFRM_INC_STATS(dev_net(skb->dev),
124 LINUX_MIB_XFRMINSTATEMODEERROR);
125 return -EINVAL;
126 }
127 }
128
129 family = inner_mode->family;
130
131 skb->mark = be32_to_cpu(tunnel->parms.i_key);
132 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
133 skb->mark = orig_mark;
134
135 if (!ret)
136 return -EPERM;
137
138 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
139 skb->dev = dev;
140 dev_sw_netstats_rx_add(dev, skb->len);
141
142 return 0;
143 }
144
145 static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
146 {
147 xfrm_address_t *daddr = (xfrm_address_t *)&dst;
148 xfrm_address_t *saddr = (xfrm_address_t *)&src;
149
150 /* if there is no transform then this tunnel is not functional.
151 * Or if the xfrm is not mode tunnel.
152 */
153 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
154 x->props.family != AF_INET)
155 return false;
156
157 if (!dst)
158 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
159
160 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
161 return false;
162
163 return true;
164 }
165
166 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
167 struct flowi *fl)
168 {
169 struct ip_tunnel *tunnel = netdev_priv(dev);
170 struct ip_tunnel_parm *parms = &tunnel->parms;
171 struct dst_entry *dst = skb_dst(skb);
172 struct net_device *tdev; /* Device to other host */
173 int pkt_len = skb->len;
174 int err;
175 int mtu;
176
177 if (!dst) {
178 switch (skb->protocol) {
179 case htons(ETH_P_IP): {
180 struct rtable *rt;
181
182 fl->u.ip4.flowi4_oif = dev->ifindex;
183 fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
184 rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
185 if (IS_ERR(rt)) {
186 dev->stats.tx_carrier_errors++;
187 goto tx_error_icmp;
188 }
189 dst = &rt->dst;
190 skb_dst_set(skb, dst);
191 break;
192 }
193 #if IS_ENABLED(CONFIG_IPV6)
194 case htons(ETH_P_IPV6):
195 fl->u.ip6.flowi6_oif = dev->ifindex;
196 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
197 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
198 if (dst->error) {
199 dst_release(dst);
200 dst = NULL;
201 dev->stats.tx_carrier_errors++;
202 goto tx_error_icmp;
203 }
204 skb_dst_set(skb, dst);
205 break;
206 #endif
207 default:
208 dev->stats.tx_carrier_errors++;
209 goto tx_error_icmp;
210 }
211 }
212
213 dst_hold(dst);
214 dst = xfrm_lookup_route(tunnel->net, dst, fl, NULL, 0);
215 if (IS_ERR(dst)) {
216 dev->stats.tx_carrier_errors++;
217 goto tx_error_icmp;
218 }
219
220 if (dst->flags & DST_XFRM_QUEUE)
221 goto queued;
222
223 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
224 dev->stats.tx_carrier_errors++;
225 dst_release(dst);
226 goto tx_error_icmp;
227 }
228
229 tdev = dst->dev;
230
231 if (tdev == dev) {
232 dst_release(dst);
233 dev->stats.collisions++;
234 goto tx_error;
235 }
236
237 mtu = dst_mtu(dst);
238 if (skb->len > mtu) {
239 skb_dst_update_pmtu_no_confirm(skb, mtu);
240 if (skb->protocol == htons(ETH_P_IP)) {
241 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
242 htonl(mtu));
243 } else {
244 if (mtu < IPV6_MIN_MTU)
245 mtu = IPV6_MIN_MTU;
246
247 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
248 }
249
250 dst_release(dst);
251 goto tx_error;
252 }
253
254 queued:
255 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
256 skb_dst_set(skb, dst);
257 skb->dev = skb_dst(skb)->dev;
258
259 err = dst_output(tunnel->net, skb->sk, skb);
260 if (net_xmit_eval(err) == 0)
261 err = pkt_len;
262 iptunnel_xmit_stats(dev, err);
263 return NETDEV_TX_OK;
264
265 tx_error_icmp:
266 dst_link_failure(skb);
267 tx_error:
268 dev->stats.tx_errors++;
269 kfree_skb(skb);
270 return NETDEV_TX_OK;
271 }
272
273 /* This function assumes it is being called from dev_queue_xmit()
274 * and that skb is filled properly by that function.
275 */
276 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
277 {
278 struct ip_tunnel *tunnel = netdev_priv(dev);
279 struct flowi fl;
280
281 if (!pskb_inet_may_pull(skb))
282 goto tx_err;
283
284 memset(&fl, 0, sizeof(fl));
285
286 switch (skb->protocol) {
287 case htons(ETH_P_IP):
288 xfrm_decode_session(skb, &fl, AF_INET);
289 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
290 break;
291 case htons(ETH_P_IPV6):
292 xfrm_decode_session(skb, &fl, AF_INET6);
293 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
294 break;
295 default:
296 goto tx_err;
297 }
298
299 /* override mark with tunnel output key */
300 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
301
302 return vti_xmit(skb, dev, &fl);
303
304 tx_err:
305 dev->stats.tx_errors++;
306 kfree_skb(skb);
307 return NETDEV_TX_OK;
308 }
309
310 static int vti4_err(struct sk_buff *skb, u32 info)
311 {
312 __be32 spi;
313 __u32 mark;
314 struct xfrm_state *x;
315 struct ip_tunnel *tunnel;
316 struct ip_esp_hdr *esph;
317 struct ip_auth_hdr *ah ;
318 struct ip_comp_hdr *ipch;
319 struct net *net = dev_net(skb->dev);
320 const struct iphdr *iph = (const struct iphdr *)skb->data;
321 int protocol = iph->protocol;
322 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
323
324 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
325 iph->daddr, iph->saddr, 0);
326 if (!tunnel)
327 return -1;
328
329 mark = be32_to_cpu(tunnel->parms.o_key);
330
331 switch (protocol) {
332 case IPPROTO_ESP:
333 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
334 spi = esph->spi;
335 break;
336 case IPPROTO_AH:
337 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
338 spi = ah->spi;
339 break;
340 case IPPROTO_COMP:
341 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
342 spi = htonl(ntohs(ipch->cpi));
343 break;
344 default:
345 return 0;
346 }
347
348 switch (icmp_hdr(skb)->type) {
349 case ICMP_DEST_UNREACH:
350 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
351 return 0;
352 case ICMP_REDIRECT:
353 break;
354 default:
355 return 0;
356 }
357
358 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
359 spi, protocol, AF_INET);
360 if (!x)
361 return 0;
362
363 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
364 ipv4_update_pmtu(skb, net, info, 0, protocol);
365 else
366 ipv4_redirect(skb, net, 0, protocol);
367 xfrm_state_put(x);
368
369 return 0;
370 }
371
372 static int
373 vti_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
374 {
375 int err = 0;
376
377 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
378 if (p->iph.version != 4 || p->iph.protocol != IPPROTO_IPIP ||
379 p->iph.ihl != 5)
380 return -EINVAL;
381 }
382
383 if (!(p->i_flags & GRE_KEY))
384 p->i_key = 0;
385 if (!(p->o_flags & GRE_KEY))
386 p->o_key = 0;
387
388 p->i_flags = VTI_ISVTI;
389
390 err = ip_tunnel_ctl(dev, p, cmd);
391 if (err)
392 return err;
393
394 if (cmd != SIOCDELTUNNEL) {
395 p->i_flags |= GRE_KEY;
396 p->o_flags |= GRE_KEY;
397 }
398 return 0;
399 }
400
401 static const struct net_device_ops vti_netdev_ops = {
402 .ndo_init = vti_tunnel_init,
403 .ndo_uninit = ip_tunnel_uninit,
404 .ndo_start_xmit = vti_tunnel_xmit,
405 .ndo_do_ioctl = ip_tunnel_ioctl,
406 .ndo_change_mtu = ip_tunnel_change_mtu,
407 .ndo_get_stats64 = dev_get_tstats64,
408 .ndo_get_iflink = ip_tunnel_get_iflink,
409 .ndo_tunnel_ctl = vti_tunnel_ctl,
410 };
411
412 static void vti_tunnel_setup(struct net_device *dev)
413 {
414 dev->netdev_ops = &vti_netdev_ops;
415 dev->header_ops = &ip_tunnel_header_ops;
416 dev->type = ARPHRD_TUNNEL;
417 ip_tunnel_setup(dev, vti_net_id);
418 }
419
420 static int vti_tunnel_init(struct net_device *dev)
421 {
422 struct ip_tunnel *tunnel = netdev_priv(dev);
423 struct iphdr *iph = &tunnel->parms.iph;
424
425 memcpy(dev->dev_addr, &iph->saddr, 4);
426 memcpy(dev->broadcast, &iph->daddr, 4);
427
428 dev->flags = IFF_NOARP;
429 dev->addr_len = 4;
430 dev->features |= NETIF_F_LLTX;
431 netif_keep_dst(dev);
432
433 return ip_tunnel_init(dev);
434 }
435
436 static void __net_init vti_fb_tunnel_init(struct net_device *dev)
437 {
438 struct ip_tunnel *tunnel = netdev_priv(dev);
439 struct iphdr *iph = &tunnel->parms.iph;
440
441 iph->version = 4;
442 iph->protocol = IPPROTO_IPIP;
443 iph->ihl = 5;
444 }
445
446 static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
447 .handler = vti_rcv_proto,
448 .input_handler = vti_input_proto,
449 .cb_handler = vti_rcv_cb,
450 .err_handler = vti4_err,
451 .priority = 100,
452 };
453
454 static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
455 .handler = vti_rcv_proto,
456 .input_handler = vti_input_proto,
457 .cb_handler = vti_rcv_cb,
458 .err_handler = vti4_err,
459 .priority = 100,
460 };
461
462 static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
463 .handler = vti_rcv_proto,
464 .input_handler = vti_input_proto,
465 .cb_handler = vti_rcv_cb,
466 .err_handler = vti4_err,
467 .priority = 100,
468 };
469
470 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
471 static int vti_rcv_tunnel(struct sk_buff *skb)
472 {
473 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
474 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
475
476 return vti_input(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr, 0, false);
477 }
478
479 static struct xfrm_tunnel vti_ipip_handler __read_mostly = {
480 .handler = vti_rcv_tunnel,
481 .cb_handler = vti_rcv_cb,
482 .err_handler = vti4_err,
483 .priority = 0,
484 };
485
486 #if IS_ENABLED(CONFIG_IPV6)
487 static struct xfrm_tunnel vti_ipip6_handler __read_mostly = {
488 .handler = vti_rcv_tunnel,
489 .cb_handler = vti_rcv_cb,
490 .err_handler = vti4_err,
491 .priority = 0,
492 };
493 #endif
494 #endif
495
496 static int __net_init vti_init_net(struct net *net)
497 {
498 int err;
499 struct ip_tunnel_net *itn;
500
501 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
502 if (err)
503 return err;
504 itn = net_generic(net, vti_net_id);
505 if (itn->fb_tunnel_dev)
506 vti_fb_tunnel_init(itn->fb_tunnel_dev);
507 return 0;
508 }
509
510 static void __net_exit vti_exit_batch_net(struct list_head *list_net)
511 {
512 ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops);
513 }
514
515 static struct pernet_operations vti_net_ops = {
516 .init = vti_init_net,
517 .exit_batch = vti_exit_batch_net,
518 .id = &vti_net_id,
519 .size = sizeof(struct ip_tunnel_net),
520 };
521
522 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
523 struct netlink_ext_ack *extack)
524 {
525 return 0;
526 }
527
528 static void vti_netlink_parms(struct nlattr *data[],
529 struct ip_tunnel_parm *parms,
530 __u32 *fwmark)
531 {
532 memset(parms, 0, sizeof(*parms));
533
534 parms->iph.protocol = IPPROTO_IPIP;
535
536 if (!data)
537 return;
538
539 parms->i_flags = VTI_ISVTI;
540
541 if (data[IFLA_VTI_LINK])
542 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
543
544 if (data[IFLA_VTI_IKEY])
545 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
546
547 if (data[IFLA_VTI_OKEY])
548 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
549
550 if (data[IFLA_VTI_LOCAL])
551 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
552
553 if (data[IFLA_VTI_REMOTE])
554 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
555
556 if (data[IFLA_VTI_FWMARK])
557 *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
558 }
559
560 static int vti_newlink(struct net *src_net, struct net_device *dev,
561 struct nlattr *tb[], struct nlattr *data[],
562 struct netlink_ext_ack *extack)
563 {
564 struct ip_tunnel_parm parms;
565 __u32 fwmark = 0;
566
567 vti_netlink_parms(data, &parms, &fwmark);
568 return ip_tunnel_newlink(dev, tb, &parms, fwmark);
569 }
570
571 static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
572 struct nlattr *data[],
573 struct netlink_ext_ack *extack)
574 {
575 struct ip_tunnel *t = netdev_priv(dev);
576 __u32 fwmark = t->fwmark;
577 struct ip_tunnel_parm p;
578
579 vti_netlink_parms(data, &p, &fwmark);
580 return ip_tunnel_changelink(dev, tb, &p, fwmark);
581 }
582
583 static size_t vti_get_size(const struct net_device *dev)
584 {
585 return
586 /* IFLA_VTI_LINK */
587 nla_total_size(4) +
588 /* IFLA_VTI_IKEY */
589 nla_total_size(4) +
590 /* IFLA_VTI_OKEY */
591 nla_total_size(4) +
592 /* IFLA_VTI_LOCAL */
593 nla_total_size(4) +
594 /* IFLA_VTI_REMOTE */
595 nla_total_size(4) +
596 /* IFLA_VTI_FWMARK */
597 nla_total_size(4) +
598 0;
599 }
600
601 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
602 {
603 struct ip_tunnel *t = netdev_priv(dev);
604 struct ip_tunnel_parm *p = &t->parms;
605
606 if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) ||
607 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) ||
608 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) ||
609 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) ||
610 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) ||
611 nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark))
612 return -EMSGSIZE;
613
614 return 0;
615 }
616
617 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
618 [IFLA_VTI_LINK] = { .type = NLA_U32 },
619 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
620 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
621 [IFLA_VTI_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) },
622 [IFLA_VTI_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) },
623 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
624 };
625
626 static struct rtnl_link_ops vti_link_ops __read_mostly = {
627 .kind = "vti",
628 .maxtype = IFLA_VTI_MAX,
629 .policy = vti_policy,
630 .priv_size = sizeof(struct ip_tunnel),
631 .setup = vti_tunnel_setup,
632 .validate = vti_tunnel_validate,
633 .newlink = vti_newlink,
634 .changelink = vti_changelink,
635 .dellink = ip_tunnel_dellink,
636 .get_size = vti_get_size,
637 .fill_info = vti_fill_info,
638 .get_link_net = ip_tunnel_get_link_net,
639 };
640
641 static int __init vti_init(void)
642 {
643 const char *msg;
644 int err;
645
646 pr_info("IPv4 over IPsec tunneling driver\n");
647
648 msg = "tunnel device";
649 err = register_pernet_device(&vti_net_ops);
650 if (err < 0)
651 goto pernet_dev_failed;
652
653 msg = "tunnel protocols";
654 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
655 if (err < 0)
656 goto xfrm_proto_esp_failed;
657 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
658 if (err < 0)
659 goto xfrm_proto_ah_failed;
660 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
661 if (err < 0)
662 goto xfrm_proto_comp_failed;
663
664 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
665 msg = "ipip tunnel";
666 err = xfrm4_tunnel_register(&vti_ipip_handler, AF_INET);
667 if (err < 0)
668 goto xfrm_tunnel_ipip_failed;
669 #if IS_ENABLED(CONFIG_IPV6)
670 err = xfrm4_tunnel_register(&vti_ipip6_handler, AF_INET6);
671 if (err < 0)
672 goto xfrm_tunnel_ipip6_failed;
673 #endif
674 #endif
675
676 msg = "netlink interface";
677 err = rtnl_link_register(&vti_link_ops);
678 if (err < 0)
679 goto rtnl_link_failed;
680
681 return err;
682
683 rtnl_link_failed:
684 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
685 #if IS_ENABLED(CONFIG_IPV6)
686 xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6);
687 xfrm_tunnel_ipip6_failed:
688 #endif
689 xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET);
690 xfrm_tunnel_ipip_failed:
691 #endif
692 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
693 xfrm_proto_comp_failed:
694 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
695 xfrm_proto_ah_failed:
696 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
697 xfrm_proto_esp_failed:
698 unregister_pernet_device(&vti_net_ops);
699 pernet_dev_failed:
700 pr_err("vti init: failed to register %s\n", msg);
701 return err;
702 }
703
704 static void __exit vti_fini(void)
705 {
706 rtnl_link_unregister(&vti_link_ops);
707 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
708 #if IS_ENABLED(CONFIG_IPV6)
709 xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6);
710 #endif
711 xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET);
712 #endif
713 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
714 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
715 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
716 unregister_pernet_device(&vti_net_ops);
717 }
718
719 module_init(vti_init);
720 module_exit(vti_fini);
721 MODULE_LICENSE("GPL");
722 MODULE_ALIAS_RTNL_LINK("vti");
723 MODULE_ALIAS_NETDEV("ip_vti0");
Linux with added FPC-III support