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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 const int type = icmp_hdr(skb)->type;
134 const int code = icmp_hdr(skb)->code;
135 struct ip_tunnel *t;
136 int err = 0;
137
138 t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
139 iph->daddr, iph->saddr, 0);
140 if (!t) {
141 err = -ENOENT;
142 goto out;
143 }
144
145 switch (type) {
146 case ICMP_DEST_UNREACH:
147 switch (code) {
148 case ICMP_SR_FAILED:
149 /* Impossible event. */
150 goto out;
151 default:
152 /* All others are translated to HOST_UNREACH.
153 * rfc2003 contains "deep thoughts" about NET_UNREACH,
154 * I believe they are just ether pollution. --ANK
155 */
156 break;
157 }
158 break;
159
160 case ICMP_TIME_EXCEEDED:
161 if (code != ICMP_EXC_TTL)
162 goto out;
163 break;
164
165 case ICMP_REDIRECT:
166 break;
167
168 default:
169 goto out;
170 }
171
172 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
173 ipv4_update_pmtu(skb, net, info, t->parms.link, iph->protocol);
174 goto out;
175 }
176
177 if (type == ICMP_REDIRECT) {
178 ipv4_redirect(skb, net, t->parms.link, iph->protocol);
179 goto out;
180 }
181
182 if (t->parms.iph.daddr == 0) {
183 err = -ENOENT;
184 goto out;
185 }
186
187 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
188 goto out;
189
190 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
191 t->err_count++;
192 else
193 t->err_count = 1;
194 t->err_time = jiffies;
195
196out:
197 return err;
198}
199
200static const struct tnl_ptk_info ipip_tpi = {
201 /* no tunnel info required for ipip. */
202 .proto = htons(ETH_P_IP),
203};
204
205#if IS_ENABLED(CONFIG_MPLS)
206static const struct tnl_ptk_info mplsip_tpi = {
207 /* no tunnel info required for mplsip. */
208 .proto = htons(ETH_P_MPLS_UC),
209};
210#endif
211
212static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
213{
214 struct net *net = dev_net(skb->dev);
215 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
216 struct metadata_dst *tun_dst = NULL;
217 struct ip_tunnel *tunnel;
218 const struct iphdr *iph;
219
220 iph = ip_hdr(skb);
221 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
222 iph->saddr, iph->daddr, 0);
223 if (tunnel) {
224 const struct tnl_ptk_info *tpi;
225
226 if (tunnel->parms.iph.protocol != ipproto &&
227 tunnel->parms.iph.protocol != 0)
228 goto drop;
229
230 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
231 goto drop;
232#if IS_ENABLED(CONFIG_MPLS)
233 if (ipproto == IPPROTO_MPLS)
234 tpi = &mplsip_tpi;
235 else
236#endif
237 tpi = &ipip_tpi;
238 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
239 goto drop;
240 if (tunnel->collect_md) {
241 tun_dst = ip_tun_rx_dst(skb, 0, 0, 0);
242 if (!tun_dst)
243 return 0;
244 }
245 skb_reset_mac_header(skb);
246
247 return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
248 }
249
250 return -1;
251
252drop:
253 kfree_skb(skb);
254 return 0;
255}
256
257static int ipip_rcv(struct sk_buff *skb)
258{
259 return ipip_tunnel_rcv(skb, IPPROTO_IPIP);
260}
261
262#if IS_ENABLED(CONFIG_MPLS)
263static int mplsip_rcv(struct sk_buff *skb)
264{
265 return ipip_tunnel_rcv(skb, IPPROTO_MPLS);
266}
267#endif
268
269/*
270 * This function assumes it is being called from dev_queue_xmit()
271 * and that skb is filled properly by that function.
272 */
273static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb,
274 struct net_device *dev)
275{
276 struct ip_tunnel *tunnel = netdev_priv(dev);
277 const struct iphdr *tiph = &tunnel->parms.iph;
278 u8 ipproto;
279
280 if (!pskb_inet_may_pull(skb))
281 goto tx_error;
282
283 switch (skb->protocol) {
284 case htons(ETH_P_IP):
285 ipproto = IPPROTO_IPIP;
286 break;
287#if IS_ENABLED(CONFIG_MPLS)
288 case htons(ETH_P_MPLS_UC):
289 ipproto = IPPROTO_MPLS;
290 break;
291#endif
292 default:
293 goto tx_error;
294 }
295
296 if (tiph->protocol != ipproto && tiph->protocol != 0)
297 goto tx_error;
298
299 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
300 goto tx_error;
301
302 skb_set_inner_ipproto(skb, ipproto);
303
304 if (tunnel->collect_md)
305 ip_md_tunnel_xmit(skb, dev, ipproto, 0);
306 else
307 ip_tunnel_xmit(skb, dev, tiph, ipproto);
308 return NETDEV_TX_OK;
309
310tx_error:
311 kfree_skb(skb);
312
313 dev->stats.tx_errors++;
314 return NETDEV_TX_OK;
315}
316
317static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto)
318{
319 switch (ipproto) {
320 case 0:
321 case IPPROTO_IPIP:
322#if IS_ENABLED(CONFIG_MPLS)
323 case IPPROTO_MPLS:
324#endif
325 return true;
326 }
327
328 return false;
329}
330
331static int
332ipip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
333{
334 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
335 if (p->iph.version != 4 ||
336 !ipip_tunnel_ioctl_verify_protocol(p->iph.protocol) ||
337 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)))
338 return -EINVAL;
339 }
340
341 p->i_key = p->o_key = 0;
342 p->i_flags = p->o_flags = 0;
343 return ip_tunnel_ctl(dev, p, cmd);
344}
345
346static const struct net_device_ops ipip_netdev_ops = {
347 .ndo_init = ipip_tunnel_init,
348 .ndo_uninit = ip_tunnel_uninit,
349 .ndo_start_xmit = ipip_tunnel_xmit,
350 .ndo_do_ioctl = ip_tunnel_ioctl,
351 .ndo_change_mtu = ip_tunnel_change_mtu,
352 .ndo_get_stats64 = dev_get_tstats64,
353 .ndo_get_iflink = ip_tunnel_get_iflink,
354 .ndo_tunnel_ctl = ipip_tunnel_ctl,
355};
356
357#define IPIP_FEATURES (NETIF_F_SG | \
358 NETIF_F_FRAGLIST | \
359 NETIF_F_HIGHDMA | \
360 NETIF_F_GSO_SOFTWARE | \
361 NETIF_F_HW_CSUM)
362
363static void ipip_tunnel_setup(struct net_device *dev)
364{
365 dev->netdev_ops = &ipip_netdev_ops;
366 dev->header_ops = &ip_tunnel_header_ops;
367
368 dev->type = ARPHRD_TUNNEL;
369 dev->flags = IFF_NOARP;
370 dev->addr_len = 4;
371 dev->features |= NETIF_F_LLTX;
372 netif_keep_dst(dev);
373
374 dev->features |= IPIP_FEATURES;
375 dev->hw_features |= IPIP_FEATURES;
376 ip_tunnel_setup(dev, ipip_net_id);
377}
378
379static int ipip_tunnel_init(struct net_device *dev)
380{
381 struct ip_tunnel *tunnel = netdev_priv(dev);
382
383 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
384 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
385
386 tunnel->tun_hlen = 0;
387 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
388 return ip_tunnel_init(dev);
389}
390
391static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
392 struct netlink_ext_ack *extack)
393{
394 u8 proto;
395
396 if (!data || !data[IFLA_IPTUN_PROTO])
397 return 0;
398
399 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
400 if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
401 return -EINVAL;
402
403 return 0;
404}
405
406static void ipip_netlink_parms(struct nlattr *data[],
407 struct ip_tunnel_parm *parms, bool *collect_md,
408 __u32 *fwmark)
409{
410 memset(parms, 0, sizeof(*parms));
411
412 parms->iph.version = 4;
413 parms->iph.protocol = IPPROTO_IPIP;
414 parms->iph.ihl = 5;
415 *collect_md = false;
416
417 if (!data)
418 return;
419
420 if (data[IFLA_IPTUN_LINK])
421 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
422
423 if (data[IFLA_IPTUN_LOCAL])
424 parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]);
425
426 if (data[IFLA_IPTUN_REMOTE])
427 parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]);
428
429 if (data[IFLA_IPTUN_TTL]) {
430 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
431 if (parms->iph.ttl)
432 parms->iph.frag_off = htons(IP_DF);
433 }
434
435 if (data[IFLA_IPTUN_TOS])
436 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
437
438 if (data[IFLA_IPTUN_PROTO])
439 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
440
441 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
442 parms->iph.frag_off = htons(IP_DF);
443
444 if (data[IFLA_IPTUN_COLLECT_METADATA])
445 *collect_md = true;
446
447 if (data[IFLA_IPTUN_FWMARK])
448 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
449}
450
451/* This function returns true when ENCAP attributes are present in the nl msg */
452static bool ipip_netlink_encap_parms(struct nlattr *data[],
453 struct ip_tunnel_encap *ipencap)
454{
455 bool ret = false;
456
457 memset(ipencap, 0, sizeof(*ipencap));
458
459 if (!data)
460 return ret;
461
462 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
463 ret = true;
464 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
465 }
466
467 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
468 ret = true;
469 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
470 }
471
472 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
473 ret = true;
474 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
475 }
476
477 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
478 ret = true;
479 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
480 }
481
482 return ret;
483}
484
485static int ipip_newlink(struct net *src_net, struct net_device *dev,
486 struct nlattr *tb[], struct nlattr *data[],
487 struct netlink_ext_ack *extack)
488{
489 struct ip_tunnel *t = netdev_priv(dev);
490 struct ip_tunnel_parm p;
491 struct ip_tunnel_encap ipencap;
492 __u32 fwmark = 0;
493
494 if (ipip_netlink_encap_parms(data, &ipencap)) {
495 int err = ip_tunnel_encap_setup(t, &ipencap);
496
497 if (err < 0)
498 return err;
499 }
500
501 ipip_netlink_parms(data, &p, &t->collect_md, &fwmark);
502 return ip_tunnel_newlink(dev, tb, &p, fwmark);
503}
504
505static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
506 struct nlattr *data[],
507 struct netlink_ext_ack *extack)
508{
509 struct ip_tunnel *t = netdev_priv(dev);
510 struct ip_tunnel_parm p;
511 struct ip_tunnel_encap ipencap;
512 bool collect_md;
513 __u32 fwmark = t->fwmark;
514
515 if (ipip_netlink_encap_parms(data, &ipencap)) {
516 int err = ip_tunnel_encap_setup(t, &ipencap);
517
518 if (err < 0)
519 return err;
520 }
521
522 ipip_netlink_parms(data, &p, &collect_md, &fwmark);
523 if (collect_md)
524 return -EINVAL;
525
526 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
527 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
528 return -EINVAL;
529
530 return ip_tunnel_changelink(dev, tb, &p, fwmark);
531}
532
533static size_t ipip_get_size(const struct net_device *dev)
534{
535 return
536 /* IFLA_IPTUN_LINK */
537 nla_total_size(4) +
538 /* IFLA_IPTUN_LOCAL */
539 nla_total_size(4) +
540 /* IFLA_IPTUN_REMOTE */
541 nla_total_size(4) +
542 /* IFLA_IPTUN_TTL */
543 nla_total_size(1) +
544 /* IFLA_IPTUN_TOS */
545 nla_total_size(1) +
546 /* IFLA_IPTUN_PROTO */
547 nla_total_size(1) +
548 /* IFLA_IPTUN_PMTUDISC */
549 nla_total_size(1) +
550 /* IFLA_IPTUN_ENCAP_TYPE */
551 nla_total_size(2) +
552 /* IFLA_IPTUN_ENCAP_FLAGS */
553 nla_total_size(2) +
554 /* IFLA_IPTUN_ENCAP_SPORT */
555 nla_total_size(2) +
556 /* IFLA_IPTUN_ENCAP_DPORT */
557 nla_total_size(2) +
558 /* IFLA_IPTUN_COLLECT_METADATA */
559 nla_total_size(0) +
560 /* IFLA_IPTUN_FWMARK */
561 nla_total_size(4) +
562 0;
563}
564
565static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
566{
567 struct ip_tunnel *tunnel = netdev_priv(dev);
568 struct ip_tunnel_parm *parm = &tunnel->parms;
569
570 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
571 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
572 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
573 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
574 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
575 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
576 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
577 !!(parm->iph.frag_off & htons(IP_DF))) ||
578 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
579 goto nla_put_failure;
580
581 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
582 tunnel->encap.type) ||
583 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
584 tunnel->encap.sport) ||
585 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
586 tunnel->encap.dport) ||
587 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
588 tunnel->encap.flags))
589 goto nla_put_failure;
590
591 if (tunnel->collect_md)
592 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
593 goto nla_put_failure;
594 return 0;
595
596nla_put_failure:
597 return -EMSGSIZE;
598}
599
600static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
601 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
602 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
603 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
604 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
605 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
606 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
607 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
608 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
609 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
610 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
611 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
612 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
613 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
614};
615
616static struct rtnl_link_ops ipip_link_ops __read_mostly = {
617 .kind = "ipip",
618 .maxtype = IFLA_IPTUN_MAX,
619 .policy = ipip_policy,
620 .priv_size = sizeof(struct ip_tunnel),
621 .setup = ipip_tunnel_setup,
622 .validate = ipip_tunnel_validate,
623 .newlink = ipip_newlink,
624 .changelink = ipip_changelink,
625 .dellink = ip_tunnel_dellink,
626 .get_size = ipip_get_size,
627 .fill_info = ipip_fill_info,
628 .get_link_net = ip_tunnel_get_link_net,
629};
630
631static struct xfrm_tunnel ipip_handler __read_mostly = {
632 .handler = ipip_rcv,
633 .err_handler = ipip_err,
634 .priority = 1,
635};
636
637#if IS_ENABLED(CONFIG_MPLS)
638static struct xfrm_tunnel mplsip_handler __read_mostly = {
639 .handler = mplsip_rcv,
640 .err_handler = ipip_err,
641 .priority = 1,
642};
643#endif
644
645static int __net_init ipip_init_net(struct net *net)
646{
647 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
648}
649
650static void __net_exit ipip_exit_batch_net(struct list_head *list_net)
651{
652 ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops);
653}
654
655static struct pernet_operations ipip_net_ops = {
656 .init = ipip_init_net,
657 .exit_batch = ipip_exit_batch_net,
658 .id = &ipip_net_id,
659 .size = sizeof(struct ip_tunnel_net),
660};
661
662static int __init ipip_init(void)
663{
664 int err;
665
666 pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
667
668 err = register_pernet_device(&ipip_net_ops);
669 if (err < 0)
670 return err;
671 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
672 if (err < 0) {
673 pr_info("%s: can't register tunnel\n", __func__);
674 goto xfrm_tunnel_ipip_failed;
675 }
676#if IS_ENABLED(CONFIG_MPLS)
677 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
678 if (err < 0) {
679 pr_info("%s: can't register tunnel\n", __func__);
680 goto xfrm_tunnel_mplsip_failed;
681 }
682#endif
683 err = rtnl_link_register(&ipip_link_ops);
684 if (err < 0)
685 goto rtnl_link_failed;
686
687out:
688 return err;
689
690rtnl_link_failed:
691#if IS_ENABLED(CONFIG_MPLS)
692 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
693xfrm_tunnel_mplsip_failed:
694
695#endif
696 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
697xfrm_tunnel_ipip_failed:
698 unregister_pernet_device(&ipip_net_ops);
699 goto out;
700}
701
702static void __exit ipip_fini(void)
703{
704 rtnl_link_unregister(&ipip_link_ops);
705 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
706 pr_info("%s: can't deregister tunnel\n", __func__);
707#if IS_ENABLED(CONFIG_MPLS)
708 if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
709 pr_info("%s: can't deregister tunnel\n", __func__);
710#endif
711 unregister_pernet_device(&ipip_net_ops);
712}
713
714module_init(ipip_init);
715module_exit(ipip_fini);
716MODULE_LICENSE("GPL");
717MODULE_ALIAS_RTNL_LINK("ipip");
718MODULE_ALIAS_NETDEV("tunl0");
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 const int type = icmp_hdr(skb)->type;
134 const int code = icmp_hdr(skb)->code;
135 struct ip_tunnel *t;
136 int err = 0;
137
138 t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
139 iph->daddr, iph->saddr, 0);
140 if (!t) {
141 err = -ENOENT;
142 goto out;
143 }
144
145 switch (type) {
146 case ICMP_DEST_UNREACH:
147 switch (code) {
148 case ICMP_SR_FAILED:
149 /* Impossible event. */
150 goto out;
151 default:
152 /* All others are translated to HOST_UNREACH.
153 * rfc2003 contains "deep thoughts" about NET_UNREACH,
154 * I believe they are just ether pollution. --ANK
155 */
156 break;
157 }
158 break;
159
160 case ICMP_TIME_EXCEEDED:
161 if (code != ICMP_EXC_TTL)
162 goto out;
163 break;
164
165 case ICMP_REDIRECT:
166 break;
167
168 default:
169 goto out;
170 }
171
172 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
173 ipv4_update_pmtu(skb, net, info, t->parms.link, iph->protocol);
174 goto out;
175 }
176
177 if (type == ICMP_REDIRECT) {
178 ipv4_redirect(skb, net, t->parms.link, iph->protocol);
179 goto out;
180 }
181
182 if (t->parms.iph.daddr == 0) {
183 err = -ENOENT;
184 goto out;
185 }
186
187 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
188 goto out;
189
190 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
191 t->err_count++;
192 else
193 t->err_count = 1;
194 t->err_time = jiffies;
195
196out:
197 return err;
198}
199
200static const struct tnl_ptk_info ipip_tpi = {
201 /* no tunnel info required for ipip. */
202 .proto = htons(ETH_P_IP),
203};
204
205#if IS_ENABLED(CONFIG_MPLS)
206static const struct tnl_ptk_info mplsip_tpi = {
207 /* no tunnel info required for mplsip. */
208 .proto = htons(ETH_P_MPLS_UC),
209};
210#endif
211
212static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
213{
214 struct net *net = dev_net(skb->dev);
215 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
216 struct metadata_dst *tun_dst = NULL;
217 struct ip_tunnel *tunnel;
218 const struct iphdr *iph;
219
220 iph = ip_hdr(skb);
221 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
222 iph->saddr, iph->daddr, 0);
223 if (tunnel) {
224 const struct tnl_ptk_info *tpi;
225
226 if (tunnel->parms.iph.protocol != ipproto &&
227 tunnel->parms.iph.protocol != 0)
228 goto drop;
229
230 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
231 goto drop;
232#if IS_ENABLED(CONFIG_MPLS)
233 if (ipproto == IPPROTO_MPLS)
234 tpi = &mplsip_tpi;
235 else
236#endif
237 tpi = &ipip_tpi;
238 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
239 goto drop;
240 if (tunnel->collect_md) {
241 tun_dst = ip_tun_rx_dst(skb, 0, 0, 0);
242 if (!tun_dst)
243 return 0;
244 ip_tunnel_md_udp_encap(skb, &tun_dst->u.tun_info);
245 }
246 skb_reset_mac_header(skb);
247
248 return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
249 }
250
251 return -1;
252
253drop:
254 kfree_skb(skb);
255 return 0;
256}
257
258static int ipip_rcv(struct sk_buff *skb)
259{
260 return ipip_tunnel_rcv(skb, IPPROTO_IPIP);
261}
262
263#if IS_ENABLED(CONFIG_MPLS)
264static int mplsip_rcv(struct sk_buff *skb)
265{
266 return ipip_tunnel_rcv(skb, IPPROTO_MPLS);
267}
268#endif
269
270/*
271 * This function assumes it is being called from dev_queue_xmit()
272 * and that skb is filled properly by that function.
273 */
274static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb,
275 struct net_device *dev)
276{
277 struct ip_tunnel *tunnel = netdev_priv(dev);
278 const struct iphdr *tiph = &tunnel->parms.iph;
279 u8 ipproto;
280
281 if (!pskb_inet_may_pull(skb))
282 goto tx_error;
283
284 switch (skb->protocol) {
285 case htons(ETH_P_IP):
286 ipproto = IPPROTO_IPIP;
287 break;
288#if IS_ENABLED(CONFIG_MPLS)
289 case htons(ETH_P_MPLS_UC):
290 ipproto = IPPROTO_MPLS;
291 break;
292#endif
293 default:
294 goto tx_error;
295 }
296
297 if (tiph->protocol != ipproto && tiph->protocol != 0)
298 goto tx_error;
299
300 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
301 goto tx_error;
302
303 skb_set_inner_ipproto(skb, ipproto);
304
305 if (tunnel->collect_md)
306 ip_md_tunnel_xmit(skb, dev, ipproto, 0);
307 else
308 ip_tunnel_xmit(skb, dev, tiph, ipproto);
309 return NETDEV_TX_OK;
310
311tx_error:
312 kfree_skb(skb);
313
314 DEV_STATS_INC(dev, tx_errors);
315 return NETDEV_TX_OK;
316}
317
318static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto)
319{
320 switch (ipproto) {
321 case 0:
322 case IPPROTO_IPIP:
323#if IS_ENABLED(CONFIG_MPLS)
324 case IPPROTO_MPLS:
325#endif
326 return true;
327 }
328
329 return false;
330}
331
332static int
333ipip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
334{
335 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
336 if (p->iph.version != 4 ||
337 !ipip_tunnel_ioctl_verify_protocol(p->iph.protocol) ||
338 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)))
339 return -EINVAL;
340 }
341
342 p->i_key = p->o_key = 0;
343 p->i_flags = p->o_flags = 0;
344 return ip_tunnel_ctl(dev, p, cmd);
345}
346
347static const struct net_device_ops ipip_netdev_ops = {
348 .ndo_init = ipip_tunnel_init,
349 .ndo_uninit = ip_tunnel_uninit,
350 .ndo_start_xmit = ipip_tunnel_xmit,
351 .ndo_siocdevprivate = ip_tunnel_siocdevprivate,
352 .ndo_change_mtu = ip_tunnel_change_mtu,
353 .ndo_get_stats64 = dev_get_tstats64,
354 .ndo_get_iflink = ip_tunnel_get_iflink,
355 .ndo_tunnel_ctl = ipip_tunnel_ctl,
356};
357
358#define IPIP_FEATURES (NETIF_F_SG | \
359 NETIF_F_FRAGLIST | \
360 NETIF_F_HIGHDMA | \
361 NETIF_F_GSO_SOFTWARE | \
362 NETIF_F_HW_CSUM)
363
364static void ipip_tunnel_setup(struct net_device *dev)
365{
366 dev->netdev_ops = &ipip_netdev_ops;
367 dev->header_ops = &ip_tunnel_header_ops;
368
369 dev->type = ARPHRD_TUNNEL;
370 dev->flags = IFF_NOARP;
371 dev->addr_len = 4;
372 dev->features |= NETIF_F_LLTX;
373 netif_keep_dst(dev);
374
375 dev->features |= IPIP_FEATURES;
376 dev->hw_features |= IPIP_FEATURES;
377 ip_tunnel_setup(dev, ipip_net_id);
378}
379
380static int ipip_tunnel_init(struct net_device *dev)
381{
382 struct ip_tunnel *tunnel = netdev_priv(dev);
383
384 __dev_addr_set(dev, &tunnel->parms.iph.saddr, 4);
385 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
386
387 tunnel->tun_hlen = 0;
388 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
389 return ip_tunnel_init(dev);
390}
391
392static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
393 struct netlink_ext_ack *extack)
394{
395 u8 proto;
396
397 if (!data || !data[IFLA_IPTUN_PROTO])
398 return 0;
399
400 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
401 if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
402 return -EINVAL;
403
404 return 0;
405}
406
407static void ipip_netlink_parms(struct nlattr *data[],
408 struct ip_tunnel_parm *parms, bool *collect_md,
409 __u32 *fwmark)
410{
411 memset(parms, 0, sizeof(*parms));
412
413 parms->iph.version = 4;
414 parms->iph.protocol = IPPROTO_IPIP;
415 parms->iph.ihl = 5;
416 *collect_md = false;
417
418 if (!data)
419 return;
420
421 ip_tunnel_netlink_parms(data, parms);
422
423 if (data[IFLA_IPTUN_COLLECT_METADATA])
424 *collect_md = true;
425
426 if (data[IFLA_IPTUN_FWMARK])
427 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
428}
429
430static int ipip_newlink(struct net *src_net, struct net_device *dev,
431 struct nlattr *tb[], struct nlattr *data[],
432 struct netlink_ext_ack *extack)
433{
434 struct ip_tunnel *t = netdev_priv(dev);
435 struct ip_tunnel_parm p;
436 struct ip_tunnel_encap ipencap;
437 __u32 fwmark = 0;
438
439 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
440 int err = ip_tunnel_encap_setup(t, &ipencap);
441
442 if (err < 0)
443 return err;
444 }
445
446 ipip_netlink_parms(data, &p, &t->collect_md, &fwmark);
447 return ip_tunnel_newlink(dev, tb, &p, fwmark);
448}
449
450static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
451 struct nlattr *data[],
452 struct netlink_ext_ack *extack)
453{
454 struct ip_tunnel *t = netdev_priv(dev);
455 struct ip_tunnel_parm p;
456 struct ip_tunnel_encap ipencap;
457 bool collect_md;
458 __u32 fwmark = t->fwmark;
459
460 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
461 int err = ip_tunnel_encap_setup(t, &ipencap);
462
463 if (err < 0)
464 return err;
465 }
466
467 ipip_netlink_parms(data, &p, &collect_md, &fwmark);
468 if (collect_md)
469 return -EINVAL;
470
471 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
472 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
473 return -EINVAL;
474
475 return ip_tunnel_changelink(dev, tb, &p, fwmark);
476}
477
478static size_t ipip_get_size(const struct net_device *dev)
479{
480 return
481 /* IFLA_IPTUN_LINK */
482 nla_total_size(4) +
483 /* IFLA_IPTUN_LOCAL */
484 nla_total_size(4) +
485 /* IFLA_IPTUN_REMOTE */
486 nla_total_size(4) +
487 /* IFLA_IPTUN_TTL */
488 nla_total_size(1) +
489 /* IFLA_IPTUN_TOS */
490 nla_total_size(1) +
491 /* IFLA_IPTUN_PROTO */
492 nla_total_size(1) +
493 /* IFLA_IPTUN_PMTUDISC */
494 nla_total_size(1) +
495 /* IFLA_IPTUN_ENCAP_TYPE */
496 nla_total_size(2) +
497 /* IFLA_IPTUN_ENCAP_FLAGS */
498 nla_total_size(2) +
499 /* IFLA_IPTUN_ENCAP_SPORT */
500 nla_total_size(2) +
501 /* IFLA_IPTUN_ENCAP_DPORT */
502 nla_total_size(2) +
503 /* IFLA_IPTUN_COLLECT_METADATA */
504 nla_total_size(0) +
505 /* IFLA_IPTUN_FWMARK */
506 nla_total_size(4) +
507 0;
508}
509
510static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
511{
512 struct ip_tunnel *tunnel = netdev_priv(dev);
513 struct ip_tunnel_parm *parm = &tunnel->parms;
514
515 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
516 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
517 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
518 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
519 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
520 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
521 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
522 !!(parm->iph.frag_off & htons(IP_DF))) ||
523 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
524 goto nla_put_failure;
525
526 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
527 tunnel->encap.type) ||
528 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
529 tunnel->encap.sport) ||
530 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
531 tunnel->encap.dport) ||
532 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
533 tunnel->encap.flags))
534 goto nla_put_failure;
535
536 if (tunnel->collect_md)
537 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
538 goto nla_put_failure;
539 return 0;
540
541nla_put_failure:
542 return -EMSGSIZE;
543}
544
545static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
546 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
547 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
548 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
549 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
550 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
551 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
552 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
553 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
554 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
555 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
556 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
557 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
558 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
559};
560
561static struct rtnl_link_ops ipip_link_ops __read_mostly = {
562 .kind = "ipip",
563 .maxtype = IFLA_IPTUN_MAX,
564 .policy = ipip_policy,
565 .priv_size = sizeof(struct ip_tunnel),
566 .setup = ipip_tunnel_setup,
567 .validate = ipip_tunnel_validate,
568 .newlink = ipip_newlink,
569 .changelink = ipip_changelink,
570 .dellink = ip_tunnel_dellink,
571 .get_size = ipip_get_size,
572 .fill_info = ipip_fill_info,
573 .get_link_net = ip_tunnel_get_link_net,
574};
575
576static struct xfrm_tunnel ipip_handler __read_mostly = {
577 .handler = ipip_rcv,
578 .err_handler = ipip_err,
579 .priority = 1,
580};
581
582#if IS_ENABLED(CONFIG_MPLS)
583static struct xfrm_tunnel mplsip_handler __read_mostly = {
584 .handler = mplsip_rcv,
585 .err_handler = ipip_err,
586 .priority = 1,
587};
588#endif
589
590static int __net_init ipip_init_net(struct net *net)
591{
592 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
593}
594
595static void __net_exit ipip_exit_batch_net(struct list_head *list_net)
596{
597 ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops);
598}
599
600static struct pernet_operations ipip_net_ops = {
601 .init = ipip_init_net,
602 .exit_batch = ipip_exit_batch_net,
603 .id = &ipip_net_id,
604 .size = sizeof(struct ip_tunnel_net),
605};
606
607static int __init ipip_init(void)
608{
609 int err;
610
611 pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
612
613 err = register_pernet_device(&ipip_net_ops);
614 if (err < 0)
615 return err;
616 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
617 if (err < 0) {
618 pr_info("%s: can't register tunnel\n", __func__);
619 goto xfrm_tunnel_ipip_failed;
620 }
621#if IS_ENABLED(CONFIG_MPLS)
622 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
623 if (err < 0) {
624 pr_info("%s: can't register tunnel\n", __func__);
625 goto xfrm_tunnel_mplsip_failed;
626 }
627#endif
628 err = rtnl_link_register(&ipip_link_ops);
629 if (err < 0)
630 goto rtnl_link_failed;
631
632out:
633 return err;
634
635rtnl_link_failed:
636#if IS_ENABLED(CONFIG_MPLS)
637 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
638xfrm_tunnel_mplsip_failed:
639
640#endif
641 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
642xfrm_tunnel_ipip_failed:
643 unregister_pernet_device(&ipip_net_ops);
644 goto out;
645}
646
647static void __exit ipip_fini(void)
648{
649 rtnl_link_unregister(&ipip_link_ops);
650 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
651 pr_info("%s: can't deregister tunnel\n", __func__);
652#if IS_ENABLED(CONFIG_MPLS)
653 if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
654 pr_info("%s: can't deregister tunnel\n", __func__);
655#endif
656 unregister_pernet_device(&ipip_net_ops);
657}
658
659module_init(ipip_init);
660module_exit(ipip_fini);
661MODULE_DESCRIPTION("IP/IP protocol decoder library");
662MODULE_LICENSE("GPL");
663MODULE_ALIAS_RTNL_LINK("ipip");
664MODULE_ALIAS_NETDEV("tunl0");