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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 (slouken@cs.ucdavis.edu) 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 (slouken@cs.ucdavis.edu) 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 (alan@lxorguk.ukuu.org.uk) 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 (slouken@cs.ucdavis.edu) 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, t->err_time + IPTUNNEL_ERR_TIMEO))
194 t->err_count++;
195 else
196 t->err_count = 1;
197 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 return 0;
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 const struct net_device_ops ipip_netdev_ops = {
357 .ndo_init = ipip_tunnel_init,
358 .ndo_uninit = ip_tunnel_uninit,
359 .ndo_start_xmit = ipip_tunnel_xmit,
360 .ndo_siocdevprivate = ip_tunnel_siocdevprivate,
361 .ndo_change_mtu = ip_tunnel_change_mtu,
362 .ndo_get_stats64 = dev_get_tstats64,
363 .ndo_get_iflink = ip_tunnel_get_iflink,
364 .ndo_tunnel_ctl = ipip_tunnel_ctl,
365};
366
367#define IPIP_FEATURES (NETIF_F_SG | \
368 NETIF_F_FRAGLIST | \
369 NETIF_F_HIGHDMA | \
370 NETIF_F_GSO_SOFTWARE | \
371 NETIF_F_HW_CSUM)
372
373static void ipip_tunnel_setup(struct net_device *dev)
374{
375 dev->netdev_ops = &ipip_netdev_ops;
376 dev->header_ops = &ip_tunnel_header_ops;
377
378 dev->type = ARPHRD_TUNNEL;
379 dev->flags = IFF_NOARP;
380 dev->addr_len = 4;
381 dev->lltx = true;
382 netif_keep_dst(dev);
383
384 dev->features |= IPIP_FEATURES;
385 dev->hw_features |= IPIP_FEATURES;
386 ip_tunnel_setup(dev, ipip_net_id);
387}
388
389static int ipip_tunnel_init(struct net_device *dev)
390{
391 struct ip_tunnel *tunnel = netdev_priv(dev);
392
393 __dev_addr_set(dev, &tunnel->parms.iph.saddr, 4);
394 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
395
396 tunnel->tun_hlen = 0;
397 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
398 return ip_tunnel_init(dev);
399}
400
401static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
402 struct netlink_ext_ack *extack)
403{
404 u8 proto;
405
406 if (!data || !data[IFLA_IPTUN_PROTO])
407 return 0;
408
409 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
410 if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
411 return -EINVAL;
412
413 return 0;
414}
415
416static void ipip_netlink_parms(struct nlattr *data[],
417 struct ip_tunnel_parm_kern *parms,
418 bool *collect_md, __u32 *fwmark)
419{
420 memset(parms, 0, sizeof(*parms));
421
422 parms->iph.version = 4;
423 parms->iph.protocol = IPPROTO_IPIP;
424 parms->iph.ihl = 5;
425 *collect_md = false;
426
427 if (!data)
428 return;
429
430 ip_tunnel_netlink_parms(data, parms);
431
432 if (data[IFLA_IPTUN_COLLECT_METADATA])
433 *collect_md = true;
434
435 if (data[IFLA_IPTUN_FWMARK])
436 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
437}
438
439static int ipip_newlink(struct net *src_net, struct net_device *dev,
440 struct nlattr *tb[], struct nlattr *data[],
441 struct netlink_ext_ack *extack)
442{
443 struct ip_tunnel *t = netdev_priv(dev);
444 struct ip_tunnel_encap ipencap;
445 struct ip_tunnel_parm_kern p;
446 __u32 fwmark = 0;
447
448 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
449 int err = ip_tunnel_encap_setup(t, &ipencap);
450
451 if (err < 0)
452 return err;
453 }
454
455 ipip_netlink_parms(data, &p, &t->collect_md, &fwmark);
456 return ip_tunnel_newlink(dev, tb, &p, fwmark);
457}
458
459static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
460 struct nlattr *data[],
461 struct netlink_ext_ack *extack)
462{
463 struct ip_tunnel *t = netdev_priv(dev);
464 struct ip_tunnel_encap ipencap;
465 struct ip_tunnel_parm_kern p;
466 bool collect_md;
467 __u32 fwmark = t->fwmark;
468
469 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
470 int err = ip_tunnel_encap_setup(t, &ipencap);
471
472 if (err < 0)
473 return err;
474 }
475
476 ipip_netlink_parms(data, &p, &collect_md, &fwmark);
477 if (collect_md)
478 return -EINVAL;
479
480 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
481 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
482 return -EINVAL;
483
484 return ip_tunnel_changelink(dev, tb, &p, fwmark);
485}
486
487static size_t ipip_get_size(const struct net_device *dev)
488{
489 return
490 /* IFLA_IPTUN_LINK */
491 nla_total_size(4) +
492 /* IFLA_IPTUN_LOCAL */
493 nla_total_size(4) +
494 /* IFLA_IPTUN_REMOTE */
495 nla_total_size(4) +
496 /* IFLA_IPTUN_TTL */
497 nla_total_size(1) +
498 /* IFLA_IPTUN_TOS */
499 nla_total_size(1) +
500 /* IFLA_IPTUN_PROTO */
501 nla_total_size(1) +
502 /* IFLA_IPTUN_PMTUDISC */
503 nla_total_size(1) +
504 /* IFLA_IPTUN_ENCAP_TYPE */
505 nla_total_size(2) +
506 /* IFLA_IPTUN_ENCAP_FLAGS */
507 nla_total_size(2) +
508 /* IFLA_IPTUN_ENCAP_SPORT */
509 nla_total_size(2) +
510 /* IFLA_IPTUN_ENCAP_DPORT */
511 nla_total_size(2) +
512 /* IFLA_IPTUN_COLLECT_METADATA */
513 nla_total_size(0) +
514 /* IFLA_IPTUN_FWMARK */
515 nla_total_size(4) +
516 0;
517}
518
519static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
520{
521 struct ip_tunnel *tunnel = netdev_priv(dev);
522 struct ip_tunnel_parm_kern *parm = &tunnel->parms;
523
524 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
525 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
526 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
527 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
528 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
529 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
530 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
531 !!(parm->iph.frag_off & htons(IP_DF))) ||
532 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
533 goto nla_put_failure;
534
535 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
536 tunnel->encap.type) ||
537 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
538 tunnel->encap.sport) ||
539 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
540 tunnel->encap.dport) ||
541 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
542 tunnel->encap.flags))
543 goto nla_put_failure;
544
545 if (tunnel->collect_md)
546 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
547 goto nla_put_failure;
548 return 0;
549
550nla_put_failure:
551 return -EMSGSIZE;
552}
553
554static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
555 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
556 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
557 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
558 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
559 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
560 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
561 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
562 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
563 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
564 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
565 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
566 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
567 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
568};
569
570static struct rtnl_link_ops ipip_link_ops __read_mostly = {
571 .kind = "ipip",
572 .maxtype = IFLA_IPTUN_MAX,
573 .policy = ipip_policy,
574 .priv_size = sizeof(struct ip_tunnel),
575 .setup = ipip_tunnel_setup,
576 .validate = ipip_tunnel_validate,
577 .newlink = ipip_newlink,
578 .changelink = ipip_changelink,
579 .dellink = ip_tunnel_dellink,
580 .get_size = ipip_get_size,
581 .fill_info = ipip_fill_info,
582 .get_link_net = ip_tunnel_get_link_net,
583};
584
585static struct xfrm_tunnel ipip_handler __read_mostly = {
586 .handler = ipip_rcv,
587 .err_handler = ipip_err,
588 .priority = 1,
589};
590
591#if IS_ENABLED(CONFIG_MPLS)
592static struct xfrm_tunnel mplsip_handler __read_mostly = {
593 .handler = mplsip_rcv,
594 .err_handler = ipip_err,
595 .priority = 1,
596};
597#endif
598
599static int __net_init ipip_init_net(struct net *net)
600{
601 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
602}
603
604static void __net_exit ipip_exit_batch_rtnl(struct list_head *list_net,
605 struct list_head *dev_to_kill)
606{
607 ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops,
608 dev_to_kill);
609}
610
611static struct pernet_operations ipip_net_ops = {
612 .init = ipip_init_net,
613 .exit_batch_rtnl = ipip_exit_batch_rtnl,
614 .id = &ipip_net_id,
615 .size = sizeof(struct ip_tunnel_net),
616};
617
618static int __init ipip_init(void)
619{
620 int err;
621
622 pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
623
624 err = register_pernet_device(&ipip_net_ops);
625 if (err < 0)
626 return err;
627 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
628 if (err < 0) {
629 pr_info("%s: can't register tunnel\n", __func__);
630 goto xfrm_tunnel_ipip_failed;
631 }
632#if IS_ENABLED(CONFIG_MPLS)
633 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
634 if (err < 0) {
635 pr_info("%s: can't register tunnel\n", __func__);
636 goto xfrm_tunnel_mplsip_failed;
637 }
638#endif
639 err = rtnl_link_register(&ipip_link_ops);
640 if (err < 0)
641 goto rtnl_link_failed;
642
643out:
644 return err;
645
646rtnl_link_failed:
647#if IS_ENABLED(CONFIG_MPLS)
648 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
649xfrm_tunnel_mplsip_failed:
650
651#endif
652 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
653xfrm_tunnel_ipip_failed:
654 unregister_pernet_device(&ipip_net_ops);
655 goto out;
656}
657
658static void __exit ipip_fini(void)
659{
660 rtnl_link_unregister(&ipip_link_ops);
661 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
662 pr_info("%s: can't deregister tunnel\n", __func__);
663#if IS_ENABLED(CONFIG_MPLS)
664 if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
665 pr_info("%s: can't deregister tunnel\n", __func__);
666#endif
667 unregister_pernet_device(&ipip_net_ops);
668}
669
670module_init(ipip_init);
671module_exit(ipip_fini);
672MODULE_DESCRIPTION("IP/IP protocol decoder library");
673MODULE_LICENSE("GPL");
674MODULE_ALIAS_RTNL_LINK("ipip");
675MODULE_ALIAS_NETDEV("tunl0");
1/*
2 * Linux NET3: IP/IP protocol decoder.
3 *
4 * Authors:
5 * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95
6 *
7 * Fixes:
8 * Alan Cox : Merged and made usable non modular (its so tiny its silly as
9 * a module taking up 2 pages).
10 * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph)
11 * to keep ip_forward happy.
12 * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8).
13 * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL
14 * David Woodhouse : Perform some basic ICMP handling.
15 * IPIP Routing without decapsulation.
16 * Carlos Picoto : GRE over IP support
17 * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c.
18 * I do not want to merge them together.
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 *
25 */
26
27/* tunnel.c: an IP tunnel driver
28
29 The purpose of this driver is to provide an IP tunnel through
30 which you can tunnel network traffic transparently across subnets.
31
32 This was written by looking at Nick Holloway's dummy driver
33 Thanks for the great code!
34
35 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95
36
37 Minor tweaks:
38 Cleaned up the code a little and added some pre-1.3.0 tweaks.
39 dev->hard_header/hard_header_len changed to use no headers.
40 Comments/bracketing tweaked.
41 Made the tunnels use dev->name not tunnel: when error reporting.
42 Added tx_dropped stat
43
44 -Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95
45
46 Reworked:
47 Changed to tunnel to destination gateway in addition to the
48 tunnel's pointopoint address
49 Almost completely rewritten
50 Note: There is currently no firewall or ICMP handling done.
51
52 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96
53
54*/
55
56/* Things I wish I had known when writing the tunnel driver:
57
58 When the tunnel_xmit() function is called, the skb contains the
59 packet to be sent (plus a great deal of extra info), and dev
60 contains the tunnel device that _we_ are.
61
62 When we are passed a packet, we are expected to fill in the
63 source address with our source IP address.
64
65 What is the proper way to allocate, copy and free a buffer?
66 After you allocate it, it is a "0 length" chunk of memory
67 starting at zero. If you want to add headers to the buffer
68 later, you'll have to call "skb_reserve(skb, amount)" with
69 the amount of memory you want reserved. Then, you call
70 "skb_put(skb, amount)" with the amount of space you want in
71 the buffer. skb_put() returns a pointer to the top (#0) of
72 that buffer. skb->len is set to the amount of space you have
73 "allocated" with skb_put(). You can then write up to skb->len
74 bytes to that buffer. If you need more, you can call skb_put()
75 again with the additional amount of space you need. You can
76 find out how much more space you can allocate by calling
77 "skb_tailroom(skb)".
78 Now, to add header space, call "skb_push(skb, header_len)".
79 This creates space at the beginning of the buffer and returns
80 a pointer to this new space. If later you need to strip a
81 header from a buffer, call "skb_pull(skb, header_len)".
82 skb_headroom() will return how much space is left at the top
83 of the buffer (before the main data). Remember, this headroom
84 space must be reserved before the skb_put() function is called.
85 */
86
87/*
88 This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c
89
90 For comments look at net/ipv4/ip_gre.c --ANK
91 */
92
93
94#include <linux/capability.h>
95#include <linux/module.h>
96#include <linux/types.h>
97#include <linux/kernel.h>
98#include <linux/slab.h>
99#include <linux/uaccess.h>
100#include <linux/skbuff.h>
101#include <linux/netdevice.h>
102#include <linux/in.h>
103#include <linux/tcp.h>
104#include <linux/udp.h>
105#include <linux/if_arp.h>
106#include <linux/init.h>
107#include <linux/netfilter_ipv4.h>
108#include <linux/if_ether.h>
109
110#include <net/sock.h>
111#include <net/ip.h>
112#include <net/icmp.h>
113#include <net/ip_tunnels.h>
114#include <net/inet_ecn.h>
115#include <net/xfrm.h>
116#include <net/net_namespace.h>
117#include <net/netns/generic.h>
118#include <net/dst_metadata.h>
119
120static bool log_ecn_error = true;
121module_param(log_ecn_error, bool, 0644);
122MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
123
124static unsigned int ipip_net_id __read_mostly;
125
126static int ipip_tunnel_init(struct net_device *dev);
127static struct rtnl_link_ops ipip_link_ops __read_mostly;
128
129static int ipip_err(struct sk_buff *skb, u32 info)
130{
131
132/* All the routers (except for Linux) return only
133 8 bytes of packet payload. It means, that precise relaying of
134 ICMP in the real Internet is absolutely infeasible.
135 */
136 struct net *net = dev_net(skb->dev);
137 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
138 const struct iphdr *iph = (const struct iphdr *)skb->data;
139 struct ip_tunnel *t;
140 int err;
141 const int type = icmp_hdr(skb)->type;
142 const int code = icmp_hdr(skb)->code;
143
144 err = -ENOENT;
145 t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
146 iph->daddr, iph->saddr, 0);
147 if (!t)
148 goto out;
149
150 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
151 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
152 t->parms.link, 0, iph->protocol, 0);
153 err = 0;
154 goto out;
155 }
156
157 if (type == ICMP_REDIRECT) {
158 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
159 iph->protocol, 0);
160 err = 0;
161 goto out;
162 }
163
164 if (t->parms.iph.daddr == 0)
165 goto out;
166
167 err = 0;
168 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
169 goto out;
170
171 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
172 t->err_count++;
173 else
174 t->err_count = 1;
175 t->err_time = jiffies;
176
177out:
178 return err;
179}
180
181static const struct tnl_ptk_info ipip_tpi = {
182 /* no tunnel info required for ipip. */
183 .proto = htons(ETH_P_IP),
184};
185
186#if IS_ENABLED(CONFIG_MPLS)
187static const struct tnl_ptk_info mplsip_tpi = {
188 /* no tunnel info required for mplsip. */
189 .proto = htons(ETH_P_MPLS_UC),
190};
191#endif
192
193static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
194{
195 struct net *net = dev_net(skb->dev);
196 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
197 struct metadata_dst *tun_dst = NULL;
198 struct ip_tunnel *tunnel;
199 const struct iphdr *iph;
200
201 iph = ip_hdr(skb);
202 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
203 iph->saddr, iph->daddr, 0);
204 if (tunnel) {
205 const struct tnl_ptk_info *tpi;
206
207 if (tunnel->parms.iph.protocol != ipproto &&
208 tunnel->parms.iph.protocol != 0)
209 goto drop;
210
211 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
212 goto drop;
213#if IS_ENABLED(CONFIG_MPLS)
214 if (ipproto == IPPROTO_MPLS)
215 tpi = &mplsip_tpi;
216 else
217#endif
218 tpi = &ipip_tpi;
219 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
220 goto drop;
221 if (tunnel->collect_md) {
222 tun_dst = ip_tun_rx_dst(skb, 0, 0, 0);
223 if (!tun_dst)
224 return 0;
225 }
226 return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
227 }
228
229 return -1;
230
231drop:
232 kfree_skb(skb);
233 return 0;
234}
235
236static int ipip_rcv(struct sk_buff *skb)
237{
238 return ipip_tunnel_rcv(skb, IPPROTO_IPIP);
239}
240
241#if IS_ENABLED(CONFIG_MPLS)
242static int mplsip_rcv(struct sk_buff *skb)
243{
244 return ipip_tunnel_rcv(skb, IPPROTO_MPLS);
245}
246#endif
247
248/*
249 * This function assumes it is being called from dev_queue_xmit()
250 * and that skb is filled properly by that function.
251 */
252static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb,
253 struct net_device *dev)
254{
255 struct ip_tunnel *tunnel = netdev_priv(dev);
256 const struct iphdr *tiph = &tunnel->parms.iph;
257 u8 ipproto;
258
259 switch (skb->protocol) {
260 case htons(ETH_P_IP):
261 ipproto = IPPROTO_IPIP;
262 break;
263#if IS_ENABLED(CONFIG_MPLS)
264 case htons(ETH_P_MPLS_UC):
265 ipproto = IPPROTO_MPLS;
266 break;
267#endif
268 default:
269 goto tx_error;
270 }
271
272 if (tiph->protocol != ipproto && tiph->protocol != 0)
273 goto tx_error;
274
275 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
276 goto tx_error;
277
278 skb_set_inner_ipproto(skb, ipproto);
279
280 if (tunnel->collect_md)
281 ip_md_tunnel_xmit(skb, dev, ipproto);
282 else
283 ip_tunnel_xmit(skb, dev, tiph, ipproto);
284 return NETDEV_TX_OK;
285
286tx_error:
287 kfree_skb(skb);
288
289 dev->stats.tx_errors++;
290 return NETDEV_TX_OK;
291}
292
293static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto)
294{
295 switch (ipproto) {
296 case 0:
297 case IPPROTO_IPIP:
298#if IS_ENABLED(CONFIG_MPLS)
299 case IPPROTO_MPLS:
300#endif
301 return true;
302 }
303
304 return false;
305}
306
307static int
308ipip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
309{
310 int err = 0;
311 struct ip_tunnel_parm p;
312
313 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
314 return -EFAULT;
315
316 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
317 if (p.iph.version != 4 ||
318 !ipip_tunnel_ioctl_verify_protocol(p.iph.protocol) ||
319 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
320 return -EINVAL;
321 }
322
323 p.i_key = p.o_key = 0;
324 p.i_flags = p.o_flags = 0;
325 err = ip_tunnel_ioctl(dev, &p, cmd);
326 if (err)
327 return err;
328
329 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
330 return -EFAULT;
331
332 return 0;
333}
334
335static const struct net_device_ops ipip_netdev_ops = {
336 .ndo_init = ipip_tunnel_init,
337 .ndo_uninit = ip_tunnel_uninit,
338 .ndo_start_xmit = ipip_tunnel_xmit,
339 .ndo_do_ioctl = ipip_tunnel_ioctl,
340 .ndo_change_mtu = ip_tunnel_change_mtu,
341 .ndo_get_stats64 = ip_tunnel_get_stats64,
342 .ndo_get_iflink = ip_tunnel_get_iflink,
343};
344
345#define IPIP_FEATURES (NETIF_F_SG | \
346 NETIF_F_FRAGLIST | \
347 NETIF_F_HIGHDMA | \
348 NETIF_F_GSO_SOFTWARE | \
349 NETIF_F_HW_CSUM)
350
351static void ipip_tunnel_setup(struct net_device *dev)
352{
353 dev->netdev_ops = &ipip_netdev_ops;
354
355 dev->type = ARPHRD_TUNNEL;
356 dev->flags = IFF_NOARP;
357 dev->addr_len = 4;
358 dev->features |= NETIF_F_LLTX;
359 netif_keep_dst(dev);
360
361 dev->features |= IPIP_FEATURES;
362 dev->hw_features |= IPIP_FEATURES;
363 ip_tunnel_setup(dev, ipip_net_id);
364}
365
366static int ipip_tunnel_init(struct net_device *dev)
367{
368 struct ip_tunnel *tunnel = netdev_priv(dev);
369
370 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
371 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
372
373 tunnel->tun_hlen = 0;
374 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
375 return ip_tunnel_init(dev);
376}
377
378static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
379{
380 u8 proto;
381
382 if (!data || !data[IFLA_IPTUN_PROTO])
383 return 0;
384
385 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
386 if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
387 return -EINVAL;
388
389 return 0;
390}
391
392static void ipip_netlink_parms(struct nlattr *data[],
393 struct ip_tunnel_parm *parms, bool *collect_md)
394{
395 memset(parms, 0, sizeof(*parms));
396
397 parms->iph.version = 4;
398 parms->iph.protocol = IPPROTO_IPIP;
399 parms->iph.ihl = 5;
400 *collect_md = false;
401
402 if (!data)
403 return;
404
405 if (data[IFLA_IPTUN_LINK])
406 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
407
408 if (data[IFLA_IPTUN_LOCAL])
409 parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]);
410
411 if (data[IFLA_IPTUN_REMOTE])
412 parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]);
413
414 if (data[IFLA_IPTUN_TTL]) {
415 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
416 if (parms->iph.ttl)
417 parms->iph.frag_off = htons(IP_DF);
418 }
419
420 if (data[IFLA_IPTUN_TOS])
421 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
422
423 if (data[IFLA_IPTUN_PROTO])
424 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
425
426 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
427 parms->iph.frag_off = htons(IP_DF);
428
429 if (data[IFLA_IPTUN_COLLECT_METADATA])
430 *collect_md = true;
431}
432
433/* This function returns true when ENCAP attributes are present in the nl msg */
434static bool ipip_netlink_encap_parms(struct nlattr *data[],
435 struct ip_tunnel_encap *ipencap)
436{
437 bool ret = false;
438
439 memset(ipencap, 0, sizeof(*ipencap));
440
441 if (!data)
442 return ret;
443
444 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
445 ret = true;
446 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
447 }
448
449 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
450 ret = true;
451 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
452 }
453
454 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
455 ret = true;
456 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
457 }
458
459 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
460 ret = true;
461 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
462 }
463
464 return ret;
465}
466
467static int ipip_newlink(struct net *src_net, struct net_device *dev,
468 struct nlattr *tb[], struct nlattr *data[])
469{
470 struct ip_tunnel *t = netdev_priv(dev);
471 struct ip_tunnel_parm p;
472 struct ip_tunnel_encap ipencap;
473
474 if (ipip_netlink_encap_parms(data, &ipencap)) {
475 int err = ip_tunnel_encap_setup(t, &ipencap);
476
477 if (err < 0)
478 return err;
479 }
480
481 ipip_netlink_parms(data, &p, &t->collect_md);
482 return ip_tunnel_newlink(dev, tb, &p);
483}
484
485static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
486 struct nlattr *data[])
487{
488 struct ip_tunnel_parm p;
489 struct ip_tunnel_encap ipencap;
490 bool collect_md;
491
492 if (ipip_netlink_encap_parms(data, &ipencap)) {
493 struct ip_tunnel *t = netdev_priv(dev);
494 int err = ip_tunnel_encap_setup(t, &ipencap);
495
496 if (err < 0)
497 return err;
498 }
499
500 ipip_netlink_parms(data, &p, &collect_md);
501 if (collect_md)
502 return -EINVAL;
503
504 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
505 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
506 return -EINVAL;
507
508 return ip_tunnel_changelink(dev, tb, &p);
509}
510
511static size_t ipip_get_size(const struct net_device *dev)
512{
513 return
514 /* IFLA_IPTUN_LINK */
515 nla_total_size(4) +
516 /* IFLA_IPTUN_LOCAL */
517 nla_total_size(4) +
518 /* IFLA_IPTUN_REMOTE */
519 nla_total_size(4) +
520 /* IFLA_IPTUN_TTL */
521 nla_total_size(1) +
522 /* IFLA_IPTUN_TOS */
523 nla_total_size(1) +
524 /* IFLA_IPTUN_PROTO */
525 nla_total_size(1) +
526 /* IFLA_IPTUN_PMTUDISC */
527 nla_total_size(1) +
528 /* IFLA_IPTUN_ENCAP_TYPE */
529 nla_total_size(2) +
530 /* IFLA_IPTUN_ENCAP_FLAGS */
531 nla_total_size(2) +
532 /* IFLA_IPTUN_ENCAP_SPORT */
533 nla_total_size(2) +
534 /* IFLA_IPTUN_ENCAP_DPORT */
535 nla_total_size(2) +
536 /* IFLA_IPTUN_COLLECT_METADATA */
537 nla_total_size(0) +
538 0;
539}
540
541static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
542{
543 struct ip_tunnel *tunnel = netdev_priv(dev);
544 struct ip_tunnel_parm *parm = &tunnel->parms;
545
546 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
547 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
548 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
549 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
550 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
551 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
552 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
553 !!(parm->iph.frag_off & htons(IP_DF))))
554 goto nla_put_failure;
555
556 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
557 tunnel->encap.type) ||
558 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
559 tunnel->encap.sport) ||
560 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
561 tunnel->encap.dport) ||
562 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
563 tunnel->encap.flags))
564 goto nla_put_failure;
565
566 if (tunnel->collect_md)
567 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
568 goto nla_put_failure;
569 return 0;
570
571nla_put_failure:
572 return -EMSGSIZE;
573}
574
575static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
576 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
577 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
578 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
579 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
580 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
581 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
582 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
583 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
584 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
585 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
586 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
587 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
588};
589
590static struct rtnl_link_ops ipip_link_ops __read_mostly = {
591 .kind = "ipip",
592 .maxtype = IFLA_IPTUN_MAX,
593 .policy = ipip_policy,
594 .priv_size = sizeof(struct ip_tunnel),
595 .setup = ipip_tunnel_setup,
596 .validate = ipip_tunnel_validate,
597 .newlink = ipip_newlink,
598 .changelink = ipip_changelink,
599 .dellink = ip_tunnel_dellink,
600 .get_size = ipip_get_size,
601 .fill_info = ipip_fill_info,
602 .get_link_net = ip_tunnel_get_link_net,
603};
604
605static struct xfrm_tunnel ipip_handler __read_mostly = {
606 .handler = ipip_rcv,
607 .err_handler = ipip_err,
608 .priority = 1,
609};
610
611#if IS_ENABLED(CONFIG_MPLS)
612static struct xfrm_tunnel mplsip_handler __read_mostly = {
613 .handler = mplsip_rcv,
614 .err_handler = ipip_err,
615 .priority = 1,
616};
617#endif
618
619static int __net_init ipip_init_net(struct net *net)
620{
621 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
622}
623
624static void __net_exit ipip_exit_net(struct net *net)
625{
626 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
627 ip_tunnel_delete_net(itn, &ipip_link_ops);
628}
629
630static struct pernet_operations ipip_net_ops = {
631 .init = ipip_init_net,
632 .exit = ipip_exit_net,
633 .id = &ipip_net_id,
634 .size = sizeof(struct ip_tunnel_net),
635};
636
637static int __init ipip_init(void)
638{
639 int err;
640
641 pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
642
643 err = register_pernet_device(&ipip_net_ops);
644 if (err < 0)
645 return err;
646 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
647 if (err < 0) {
648 pr_info("%s: can't register tunnel\n", __func__);
649 goto xfrm_tunnel_ipip_failed;
650 }
651#if IS_ENABLED(CONFIG_MPLS)
652 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
653 if (err < 0) {
654 pr_info("%s: can't register tunnel\n", __func__);
655 goto xfrm_tunnel_mplsip_failed;
656 }
657#endif
658 err = rtnl_link_register(&ipip_link_ops);
659 if (err < 0)
660 goto rtnl_link_failed;
661
662out:
663 return err;
664
665rtnl_link_failed:
666#if IS_ENABLED(CONFIG_MPLS)
667 xfrm4_tunnel_deregister(&mplsip_handler, AF_INET);
668xfrm_tunnel_mplsip_failed:
669
670#endif
671 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
672xfrm_tunnel_ipip_failed:
673 unregister_pernet_device(&ipip_net_ops);
674 goto out;
675}
676
677static void __exit ipip_fini(void)
678{
679 rtnl_link_unregister(&ipip_link_ops);
680 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
681 pr_info("%s: can't deregister tunnel\n", __func__);
682#if IS_ENABLED(CONFIG_MPLS)
683 if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
684 pr_info("%s: can't deregister tunnel\n", __func__);
685#endif
686 unregister_pernet_device(&ipip_net_ops);
687}
688
689module_init(ipip_init);
690module_exit(ipip_fini);
691MODULE_LICENSE("GPL");
692MODULE_ALIAS_RTNL_LINK("ipip");
693MODULE_ALIAS_NETDEV("tunl0");