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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Linux NET3: IP/IP protocol decoder.
4 *
5 * Authors:
6 * Sam Lantinga ([email protected]) 02/01/95
7 *
8 * Fixes:
9 * Alan Cox : Merged and made usable non modular (its so tiny its silly as
10 * a module taking up 2 pages).
11 * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph)
12 * to keep ip_forward happy.
13 * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8).
14 * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL
15 * David Woodhouse : Perform some basic ICMP handling.
16 * IPIP Routing without decapsulation.
17 * Carlos Picoto : GRE over IP support
18 * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c.
19 * I do not want to merge them together.
20 */
21
22/* tunnel.c: an IP tunnel driver
23
24 The purpose of this driver is to provide an IP tunnel through
25 which you can tunnel network traffic transparently across subnets.
26
27 This was written by looking at Nick Holloway's dummy driver
28 Thanks for the great code!
29
30 -Sam Lantinga ([email protected]) 02/01/95
31
32 Minor tweaks:
33 Cleaned up the code a little and added some pre-1.3.0 tweaks.
34 dev->hard_header/hard_header_len changed to use no headers.
35 Comments/bracketing tweaked.
36 Made the tunnels use dev->name not tunnel: when error reporting.
37 Added tx_dropped stat
38
39 -Alan Cox ([email protected]) 21 March 95
40
41 Reworked:
42 Changed to tunnel to destination gateway in addition to the
43 tunnel's pointopoint address
44 Almost completely rewritten
45 Note: There is currently no firewall or ICMP handling done.
46
47 -Sam Lantinga ([email protected]) 02/13/96
48
49*/
50
51/* Things I wish I had known when writing the tunnel driver:
52
53 When the tunnel_xmit() function is called, the skb contains the
54 packet to be sent (plus a great deal of extra info), and dev
55 contains the tunnel device that _we_ are.
56
57 When we are passed a packet, we are expected to fill in the
58 source address with our source IP address.
59
60 What is the proper way to allocate, copy and free a buffer?
61 After you allocate it, it is a "0 length" chunk of memory
62 starting at zero. If you want to add headers to the buffer
63 later, you'll have to call "skb_reserve(skb, amount)" with
64 the amount of memory you want reserved. Then, you call
65 "skb_put(skb, amount)" with the amount of space you want in
66 the buffer. skb_put() returns a pointer to the top (#0) of
67 that buffer. skb->len is set to the amount of space you have
68 "allocated" with skb_put(). You can then write up to skb->len
69 bytes to that buffer. If you need more, you can call skb_put()
70 again with the additional amount of space you need. You can
71 find out how much more space you can allocate by calling
72 "skb_tailroom(skb)".
73 Now, to add header space, call "skb_push(skb, header_len)".
74 This creates space at the beginning of the buffer and returns
75 a pointer to this new space. If later you need to strip a
76 header from a buffer, call "skb_pull(skb, header_len)".
77 skb_headroom() will return how much space is left at the top
78 of the buffer (before the main data). Remember, this headroom
79 space must be reserved before the skb_put() function is called.
80 */
81
82/*
83 This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c
84
85 For comments look at net/ipv4/ip_gre.c --ANK
86 */
87
88
89#include <linux/capability.h>
90#include <linux/module.h>
91#include <linux/types.h>
92#include <linux/kernel.h>
93#include <linux/slab.h>
94#include <linux/uaccess.h>
95#include <linux/skbuff.h>
96#include <linux/netdevice.h>
97#include <linux/in.h>
98#include <linux/tcp.h>
99#include <linux/udp.h>
100#include <linux/if_arp.h>
101#include <linux/init.h>
102#include <linux/netfilter_ipv4.h>
103#include <linux/if_ether.h>
104
105#include <net/sock.h>
106#include <net/ip.h>
107#include <net/icmp.h>
108#include <net/ip_tunnels.h>
109#include <net/inet_ecn.h>
110#include <net/xfrm.h>
111#include <net/net_namespace.h>
112#include <net/netns/generic.h>
113#include <net/dst_metadata.h>
114
115static bool log_ecn_error = true;
116module_param(log_ecn_error, bool, 0644);
117MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
118
119static unsigned int ipip_net_id __read_mostly;
120
121static int ipip_tunnel_init(struct net_device *dev);
122static struct rtnl_link_ops ipip_link_ops __read_mostly;
123
124static int ipip_err(struct sk_buff *skb, u32 info)
125{
126 /* All the routers (except for Linux) return only
127 * 8 bytes of packet payload. It means, that precise relaying of
128 * ICMP in the real Internet is absolutely infeasible.
129 */
130 struct net *net = dev_net(skb->dev);
131 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
132 const struct iphdr *iph = (const struct iphdr *)skb->data;
133 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
134 const int type = icmp_hdr(skb)->type;
135 const int code = icmp_hdr(skb)->code;
136 struct ip_tunnel *t;
137 int err = 0;
138
139 __set_bit(IP_TUNNEL_NO_KEY_BIT, flags);
140
141 t = ip_tunnel_lookup(itn, skb->dev->ifindex, flags, iph->daddr,
142 iph->saddr, 0);
143 if (!t) {
144 err = -ENOENT;
145 goto out;
146 }
147
148 switch (type) {
149 case ICMP_DEST_UNREACH:
150 switch (code) {
151 case ICMP_SR_FAILED:
152 /* Impossible event. */
153 goto out;
154 default:
155 /* All others are translated to HOST_UNREACH.
156 * rfc2003 contains "deep thoughts" about NET_UNREACH,
157 * I believe they are just ether pollution. --ANK
158 */
159 break;
160 }
161 break;
162
163 case ICMP_TIME_EXCEEDED:
164 if (code != ICMP_EXC_TTL)
165 goto out;
166 break;
167
168 case ICMP_REDIRECT:
169 break;
170
171 default:
172 goto out;
173 }
174
175 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
176 ipv4_update_pmtu(skb, net, info, t->parms.link, iph->protocol);
177 goto out;
178 }
179
180 if (type == ICMP_REDIRECT) {
181 ipv4_redirect(skb, net, t->parms.link, iph->protocol);
182 goto out;
183 }
184
185 if (t->parms.iph.daddr == 0) {
186 err = -ENOENT;
187 goto out;
188 }
189
190 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
191 goto out;
192
193 if (time_before(jiffies, READ_ONCE(t->err_time) + IPTUNNEL_ERR_TIMEO))
194 WRITE_ONCE(t->err_count, READ_ONCE(t->err_count) + 1);
195 else
196 WRITE_ONCE(t->err_count, 1);
197 WRITE_ONCE(t->err_time, jiffies);
198
199out:
200 return err;
201}
202
203static const struct tnl_ptk_info ipip_tpi = {
204 /* no tunnel info required for ipip. */
205 .proto = htons(ETH_P_IP),
206};
207
208#if IS_ENABLED(CONFIG_MPLS)
209static const struct tnl_ptk_info mplsip_tpi = {
210 /* no tunnel info required for mplsip. */
211 .proto = htons(ETH_P_MPLS_UC),
212};
213#endif
214
215static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
216{
217 struct net *net = dev_net(skb->dev);
218 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
219 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
220 struct metadata_dst *tun_dst = NULL;
221 struct ip_tunnel *tunnel;
222 const struct iphdr *iph;
223
224 __set_bit(IP_TUNNEL_NO_KEY_BIT, flags);
225
226 iph = ip_hdr(skb);
227 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, flags, iph->saddr,
228 iph->daddr, 0);
229 if (tunnel) {
230 const struct tnl_ptk_info *tpi;
231
232 if (tunnel->parms.iph.protocol != ipproto &&
233 tunnel->parms.iph.protocol != 0)
234 goto drop;
235
236 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
237 goto drop;
238#if IS_ENABLED(CONFIG_MPLS)
239 if (ipproto == IPPROTO_MPLS)
240 tpi = &mplsip_tpi;
241 else
242#endif
243 tpi = &ipip_tpi;
244 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
245 goto drop;
246 if (tunnel->collect_md) {
247 ip_tunnel_flags_zero(flags);
248
249 tun_dst = ip_tun_rx_dst(skb, flags, 0, 0);
250 if (!tun_dst)
251 goto drop;
252 ip_tunnel_md_udp_encap(skb, &tun_dst->u.tun_info);
253 }
254 skb_reset_mac_header(skb);
255
256 return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
257 }
258
259 return -1;
260
261drop:
262 kfree_skb(skb);
263 return 0;
264}
265
266static int ipip_rcv(struct sk_buff *skb)
267{
268 return ipip_tunnel_rcv(skb, IPPROTO_IPIP);
269}
270
271#if IS_ENABLED(CONFIG_MPLS)
272static int mplsip_rcv(struct sk_buff *skb)
273{
274 return ipip_tunnel_rcv(skb, IPPROTO_MPLS);
275}
276#endif
277
278/*
279 * This function assumes it is being called from dev_queue_xmit()
280 * and that skb is filled properly by that function.
281 */
282static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb,
283 struct net_device *dev)
284{
285 struct ip_tunnel *tunnel = netdev_priv(dev);
286 const struct iphdr *tiph = &tunnel->parms.iph;
287 u8 ipproto;
288
289 if (!pskb_inet_may_pull(skb))
290 goto tx_error;
291
292 switch (skb->protocol) {
293 case htons(ETH_P_IP):
294 ipproto = IPPROTO_IPIP;
295 break;
296#if IS_ENABLED(CONFIG_MPLS)
297 case htons(ETH_P_MPLS_UC):
298 ipproto = IPPROTO_MPLS;
299 break;
300#endif
301 default:
302 goto tx_error;
303 }
304
305 if (tiph->protocol != ipproto && tiph->protocol != 0)
306 goto tx_error;
307
308 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
309 goto tx_error;
310
311 skb_set_inner_ipproto(skb, ipproto);
312
313 if (tunnel->collect_md)
314 ip_md_tunnel_xmit(skb, dev, ipproto, 0);
315 else
316 ip_tunnel_xmit(skb, dev, tiph, ipproto);
317 return NETDEV_TX_OK;
318
319tx_error:
320 kfree_skb(skb);
321
322 DEV_STATS_INC(dev, tx_errors);
323 return NETDEV_TX_OK;
324}
325
326static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto)
327{
328 switch (ipproto) {
329 case 0:
330 case IPPROTO_IPIP:
331#if IS_ENABLED(CONFIG_MPLS)
332 case IPPROTO_MPLS:
333#endif
334 return true;
335 }
336
337 return false;
338}
339
340static int
341ipip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, int cmd)
342{
343 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
344 if (p->iph.version != 4 ||
345 !ipip_tunnel_ioctl_verify_protocol(p->iph.protocol) ||
346 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)))
347 return -EINVAL;
348 }
349
350 p->i_key = p->o_key = 0;
351 ip_tunnel_flags_zero(p->i_flags);
352 ip_tunnel_flags_zero(p->o_flags);
353 return ip_tunnel_ctl(dev, p, cmd);
354}
355
356static int ipip_fill_forward_path(struct net_device_path_ctx *ctx,
357 struct net_device_path *path)
358{
359 struct ip_tunnel *tunnel = netdev_priv(ctx->dev);
360 const struct iphdr *tiph = &tunnel->parms.iph;
361 struct rtable *rt;
362
363 if (ctx->ether_type != cpu_to_be16(ETH_P_IP))
364 return -EOPNOTSUPP;
365
366 if (tunnel->collect_md)
367 return -EOPNOTSUPP;
368
369 if (tunnel->parms.iph.tos & 0x1)
370 return -EOPNOTSUPP;
371
372 rt = ip_route_output(dev_net(ctx->dev), tiph->daddr, tiph->saddr,
373 inet_dsfield_to_dscp(tiph->tos),
374 tunnel->parms.link, RT_SCOPE_UNIVERSE);
375 if (IS_ERR(rt))
376 return PTR_ERR(rt);
377
378 path->type = DEV_PATH_TUN;
379 path->tun.src_v4.s_addr = tiph->saddr;
380 path->tun.dst_v4.s_addr = tiph->daddr;
381 path->tun.inner_proto = IPPROTO_IPIP;
382 path->tun.dst = &rt->dst;
383 path->dev = ctx->dev;
384
385 ctx->dev = rt->dst.dev;
386
387 return 0;
388}
389
390static const struct net_device_ops ipip_netdev_ops = {
391 .ndo_init = ipip_tunnel_init,
392 .ndo_uninit = ip_tunnel_uninit,
393 .ndo_start_xmit = ipip_tunnel_xmit,
394 .ndo_siocdevprivate = ip_tunnel_siocdevprivate,
395 .ndo_change_mtu = ip_tunnel_change_mtu,
396 .ndo_get_stats64 = dev_get_tstats64,
397 .ndo_get_iflink = ip_tunnel_get_iflink,
398 .ndo_tunnel_ctl = ipip_tunnel_ctl,
399 .ndo_fill_forward_path = ipip_fill_forward_path,
400};
401
402#define IPIP_FEATURES (NETIF_F_SG | \
403 NETIF_F_FRAGLIST | \
404 NETIF_F_HIGHDMA | \
405 NETIF_F_GSO_SOFTWARE | \
406 NETIF_F_HW_CSUM)
407
408static void ipip_tunnel_setup(struct net_device *dev)
409{
410 dev->netdev_ops = &ipip_netdev_ops;
411 dev->header_ops = &ip_tunnel_header_ops;
412
413 dev->type = ARPHRD_TUNNEL;
414 dev->flags = IFF_NOARP;
415 dev->addr_len = 4;
416 dev->lltx = true;
417 netif_keep_dst(dev);
418
419 dev->features |= IPIP_FEATURES;
420 dev->hw_features |= IPIP_FEATURES;
421 ip_tunnel_setup(dev, ipip_net_id);
422}
423
424static int ipip_tunnel_init(struct net_device *dev)
425{
426 struct ip_tunnel *tunnel = netdev_priv(dev);
427
428 __dev_addr_set(dev, &tunnel->parms.iph.saddr, 4);
429 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
430
431 tunnel->tun_hlen = 0;
432 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
433 return ip_tunnel_init(dev);
434}
435
436static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
437 struct netlink_ext_ack *extack)
438{
439 u8 proto;
440
441 if (!data || !data[IFLA_IPTUN_PROTO])
442 return 0;
443
444 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
445 if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
446 return -EINVAL;
447
448 return 0;
449}
450
451static void ipip_netlink_parms(struct nlattr *data[],
452 struct ip_tunnel_parm_kern *parms,
453 bool *collect_md, __u32 *fwmark)
454{
455 memset(parms, 0, sizeof(*parms));
456
457 parms->iph.version = 4;
458 parms->iph.protocol = IPPROTO_IPIP;
459 parms->iph.ihl = 5;
460 *collect_md = false;
461
462 if (!data)
463 return;
464
465 ip_tunnel_netlink_parms(data, parms);
466
467 if (data[IFLA_IPTUN_COLLECT_METADATA])
468 *collect_md = true;
469
470 if (data[IFLA_IPTUN_FWMARK])
471 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
472}
473
474static int ipip_newlink(struct net_device *dev,
475 struct rtnl_newlink_params *params,
476 struct netlink_ext_ack *extack)
477{
478 struct ip_tunnel *t = netdev_priv(dev);
479 struct nlattr **data = params->data;
480 struct nlattr **tb = params->tb;
481 struct ip_tunnel_encap ipencap;
482 struct ip_tunnel_parm_kern p;
483 __u32 fwmark = 0;
484
485 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
486 int err = ip_tunnel_encap_setup(t, &ipencap);
487
488 if (err < 0)
489 return err;
490 }
491
492 ipip_netlink_parms(data, &p, &t->collect_md, &fwmark);
493 return ip_tunnel_newlink(params->link_net ? : dev_net(dev), dev, tb, &p,
494 fwmark);
495}
496
497static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
498 struct nlattr *data[],
499 struct netlink_ext_ack *extack)
500{
501 struct ip_tunnel *t = netdev_priv(dev);
502 struct ip_tunnel_encap ipencap;
503 struct ip_tunnel_parm_kern p;
504 bool collect_md;
505 __u32 fwmark = t->fwmark;
506
507 if (!rtnl_dev_link_net_capable(dev, t->net))
508 return -EPERM;
509
510 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
511 int err = ip_tunnel_encap_setup(t, &ipencap);
512
513 if (err < 0)
514 return err;
515 }
516
517 ipip_netlink_parms(data, &p, &collect_md, &fwmark);
518 if (collect_md)
519 return -EINVAL;
520
521 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
522 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
523 return -EINVAL;
524
525 return ip_tunnel_changelink(dev, tb, &p, fwmark);
526}
527
528static size_t ipip_get_size(const struct net_device *dev)
529{
530 return
531 /* IFLA_IPTUN_LINK */
532 nla_total_size(4) +
533 /* IFLA_IPTUN_LOCAL */
534 nla_total_size(4) +
535 /* IFLA_IPTUN_REMOTE */
536 nla_total_size(4) +
537 /* IFLA_IPTUN_TTL */
538 nla_total_size(1) +
539 /* IFLA_IPTUN_TOS */
540 nla_total_size(1) +
541 /* IFLA_IPTUN_PROTO */
542 nla_total_size(1) +
543 /* IFLA_IPTUN_PMTUDISC */
544 nla_total_size(1) +
545 /* IFLA_IPTUN_ENCAP_TYPE */
546 nla_total_size(2) +
547 /* IFLA_IPTUN_ENCAP_FLAGS */
548 nla_total_size(2) +
549 /* IFLA_IPTUN_ENCAP_SPORT */
550 nla_total_size(2) +
551 /* IFLA_IPTUN_ENCAP_DPORT */
552 nla_total_size(2) +
553 /* IFLA_IPTUN_COLLECT_METADATA */
554 nla_total_size(0) +
555 /* IFLA_IPTUN_FWMARK */
556 nla_total_size(4) +
557 0;
558}
559
560static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
561{
562 struct ip_tunnel *tunnel = netdev_priv(dev);
563 struct ip_tunnel_parm_kern *parm = &tunnel->parms;
564
565 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
566 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
567 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
568 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
569 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
570 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
571 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
572 !!(parm->iph.frag_off & htons(IP_DF))) ||
573 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
574 goto nla_put_failure;
575
576 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
577 tunnel->encap.type) ||
578 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
579 tunnel->encap.sport) ||
580 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
581 tunnel->encap.dport) ||
582 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
583 tunnel->encap.flags))
584 goto nla_put_failure;
585
586 if (tunnel->collect_md)
587 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
588 goto nla_put_failure;
589 return 0;
590
591nla_put_failure:
592 return -EMSGSIZE;
593}
594
595static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
596 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
597 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
598 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
599 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
600 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
601 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
602 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
603 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
604 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
605 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
606 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
607 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
608 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
609};
610
611static struct rtnl_link_ops ipip_link_ops __read_mostly = {
612 .kind = "ipip",
613 .maxtype = IFLA_IPTUN_MAX,
614 .policy = ipip_policy,
615 .priv_size = sizeof(struct ip_tunnel),
616 .setup = ipip_tunnel_setup,
617 .validate = ipip_tunnel_validate,
618 .newlink = ipip_newlink,
619 .changelink = ipip_changelink,
620 .dellink = ip_tunnel_dellink,
621 .get_size = ipip_get_size,
622 .fill_info = ipip_fill_info,
623 .get_link_net = ip_tunnel_get_link_net,
624};
625
626static struct xfrm_tunnel ipip_handler __read_mostly = {
627 .handler = ipip_rcv,
628 .err_handler = ipip_err,
629 .priority = 1,
630};
631
632#if IS_ENABLED(CONFIG_MPLS)
633static struct xfrm_tunnel mplsip_handler __read_mostly = {
634 .handler = mplsip_rcv,
635 .err_handler = ipip_err,
636 .priority = 1,
637};
638#endif
639
640static int __net_init ipip_init_net(struct net *net)
641{
642 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
643}
644
645static void __net_exit ipip_exit_rtnl(struct net *net,
646 struct list_head *dev_to_kill)
647{
648 ip_tunnel_delete_net(net, ipip_net_id, &ipip_link_ops, dev_to_kill);
649}
650
651static struct pernet_operations ipip_net_ops = {
652 .init = ipip_init_net,
653 .exit_rtnl = ipip_exit_rtnl,
654 .id = &ipip_net_id,
655 .size = sizeof(struct ip_tunnel_net),
656};
657
658static int __init ipip_init(void)
659{
660 int err;
661
662 pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
663
664 err = register_pernet_device(&ipip_net_ops);
665 if (err < 0)
666 return err;
667 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
668 if (err < 0) {
669 pr_info("%s: can't register tunnel\n", __func__);
670 goto xfrm_tunnel_ipip_failed;
671 }
672#if IS_ENABLED(CONFIG_MPLS)
673 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
674 if (err < 0) {
675 pr_info("%s: can't register tunnel\n", __func__);
676 goto xfrm_tunnel_mplsip_failed;
677 }
678#endif
679 err = rtnl_link_register(&ipip_link_ops);
680 if (err < 0)
681 goto rtnl_link_failed;
682
683out:
684 return err;
685
686rtnl_link_failed:
687#if IS_ENABLED(CONFIG_MPLS)
688 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
689xfrm_tunnel_mplsip_failed:
690
691#endif
692 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
693xfrm_tunnel_ipip_failed:
694 unregister_pernet_device(&ipip_net_ops);
695 goto out;
696}
697
698static void __exit ipip_fini(void)
699{
700 rtnl_link_unregister(&ipip_link_ops);
701 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
702 pr_info("%s: can't deregister tunnel\n", __func__);
703#if IS_ENABLED(CONFIG_MPLS)
704 if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
705 pr_info("%s: can't deregister tunnel\n", __func__);
706#endif
707 unregister_pernet_device(&ipip_net_ops);
708}
709
710module_init(ipip_init);
711module_exit(ipip_fini);
712MODULE_DESCRIPTION("IP/IP protocol decoder library");
713MODULE_LICENSE("GPL");
714MODULE_ALIAS_RTNL_LINK("ipip");
715MODULE_ALIAS_NETDEV("tunl0");