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
115 static bool log_ecn_error = true;
116 module_param(log_ecn_error, bool, 0644);
117 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
118
119 static unsigned int ipip_net_id __read_mostly;
120
121 static int ipip_tunnel_init(struct net_device *dev);
122 static struct rtnl_link_ops ipip_link_ops __read_mostly;
123
ipip_err(struct sk_buff * skb,u32 info)124 static 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
199 out:
200 return err;
201 }
202
203 static 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)
209 static 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
ipip_tunnel_rcv(struct sk_buff * skb,u8 ipproto)215 static 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
261 drop:
262 kfree_skb(skb);
263 return 0;
264 }
265
ipip_rcv(struct sk_buff * skb)266 static int ipip_rcv(struct sk_buff *skb)
267 {
268 return ipip_tunnel_rcv(skb, IPPROTO_IPIP);
269 }
270
271 #if IS_ENABLED(CONFIG_MPLS)
mplsip_rcv(struct sk_buff * skb)272 static 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 */
ipip_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)282 static 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
319 tx_error:
320 kfree_skb(skb);
321
322 DEV_STATS_INC(dev, tx_errors);
323 return NETDEV_TX_OK;
324 }
325
ipip_tunnel_ioctl_verify_protocol(u8 ipproto)326 static 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
340 static int
ipip_tunnel_ctl(struct net_device * dev,struct ip_tunnel_parm_kern * p,int cmd)341 ipip_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
356 static 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
ipip_tunnel_setup(struct net_device * dev)373 static 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
ipip_tunnel_init(struct net_device * dev)389 static 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
ipip_tunnel_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)401 static 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
ipip_netlink_parms(struct nlattr * data[],struct ip_tunnel_parm_kern * parms,bool * collect_md,__u32 * fwmark)416 static 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
ipip_newlink(struct net_device * dev,struct rtnl_newlink_params * params,struct netlink_ext_ack * extack)439 static int ipip_newlink(struct net_device *dev,
440 struct rtnl_newlink_params *params,
441 struct netlink_ext_ack *extack)
442 {
443 struct ip_tunnel *t = netdev_priv(dev);
444 struct nlattr **data = params->data;
445 struct nlattr **tb = params->tb;
446 struct ip_tunnel_encap ipencap;
447 struct ip_tunnel_parm_kern p;
448 __u32 fwmark = 0;
449
450 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
451 int err = ip_tunnel_encap_setup(t, &ipencap);
452
453 if (err < 0)
454 return err;
455 }
456
457 ipip_netlink_parms(data, &p, &t->collect_md, &fwmark);
458 return ip_tunnel_newlink(params->link_net ? : dev_net(dev), dev, tb, &p,
459 fwmark);
460 }
461
ipip_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)462 static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
463 struct nlattr *data[],
464 struct netlink_ext_ack *extack)
465 {
466 struct ip_tunnel *t = netdev_priv(dev);
467 struct ip_tunnel_encap ipencap;
468 struct ip_tunnel_parm_kern p;
469 bool collect_md;
470 __u32 fwmark = t->fwmark;
471
472 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
473 int err = ip_tunnel_encap_setup(t, &ipencap);
474
475 if (err < 0)
476 return err;
477 }
478
479 ipip_netlink_parms(data, &p, &collect_md, &fwmark);
480 if (collect_md)
481 return -EINVAL;
482
483 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
484 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
485 return -EINVAL;
486
487 return ip_tunnel_changelink(dev, tb, &p, fwmark);
488 }
489
ipip_get_size(const struct net_device * dev)490 static size_t ipip_get_size(const struct net_device *dev)
491 {
492 return
493 /* IFLA_IPTUN_LINK */
494 nla_total_size(4) +
495 /* IFLA_IPTUN_LOCAL */
496 nla_total_size(4) +
497 /* IFLA_IPTUN_REMOTE */
498 nla_total_size(4) +
499 /* IFLA_IPTUN_TTL */
500 nla_total_size(1) +
501 /* IFLA_IPTUN_TOS */
502 nla_total_size(1) +
503 /* IFLA_IPTUN_PROTO */
504 nla_total_size(1) +
505 /* IFLA_IPTUN_PMTUDISC */
506 nla_total_size(1) +
507 /* IFLA_IPTUN_ENCAP_TYPE */
508 nla_total_size(2) +
509 /* IFLA_IPTUN_ENCAP_FLAGS */
510 nla_total_size(2) +
511 /* IFLA_IPTUN_ENCAP_SPORT */
512 nla_total_size(2) +
513 /* IFLA_IPTUN_ENCAP_DPORT */
514 nla_total_size(2) +
515 /* IFLA_IPTUN_COLLECT_METADATA */
516 nla_total_size(0) +
517 /* IFLA_IPTUN_FWMARK */
518 nla_total_size(4) +
519 0;
520 }
521
ipip_fill_info(struct sk_buff * skb,const struct net_device * dev)522 static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
523 {
524 struct ip_tunnel *tunnel = netdev_priv(dev);
525 struct ip_tunnel_parm_kern *parm = &tunnel->parms;
526
527 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
528 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
529 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
530 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
531 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
532 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
533 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
534 !!(parm->iph.frag_off & htons(IP_DF))) ||
535 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
536 goto nla_put_failure;
537
538 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
539 tunnel->encap.type) ||
540 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
541 tunnel->encap.sport) ||
542 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
543 tunnel->encap.dport) ||
544 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
545 tunnel->encap.flags))
546 goto nla_put_failure;
547
548 if (tunnel->collect_md)
549 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
550 goto nla_put_failure;
551 return 0;
552
553 nla_put_failure:
554 return -EMSGSIZE;
555 }
556
557 static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
558 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
559 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
560 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
561 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
562 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
563 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
564 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
565 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
566 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
567 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
568 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
569 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
570 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
571 };
572
573 static struct rtnl_link_ops ipip_link_ops __read_mostly = {
574 .kind = "ipip",
575 .maxtype = IFLA_IPTUN_MAX,
576 .policy = ipip_policy,
577 .priv_size = sizeof(struct ip_tunnel),
578 .setup = ipip_tunnel_setup,
579 .validate = ipip_tunnel_validate,
580 .newlink = ipip_newlink,
581 .changelink = ipip_changelink,
582 .dellink = ip_tunnel_dellink,
583 .get_size = ipip_get_size,
584 .fill_info = ipip_fill_info,
585 .get_link_net = ip_tunnel_get_link_net,
586 };
587
588 static struct xfrm_tunnel ipip_handler __read_mostly = {
589 .handler = ipip_rcv,
590 .err_handler = ipip_err,
591 .priority = 1,
592 };
593
594 #if IS_ENABLED(CONFIG_MPLS)
595 static struct xfrm_tunnel mplsip_handler __read_mostly = {
596 .handler = mplsip_rcv,
597 .err_handler = ipip_err,
598 .priority = 1,
599 };
600 #endif
601
ipip_init_net(struct net * net)602 static int __net_init ipip_init_net(struct net *net)
603 {
604 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
605 }
606
ipip_exit_batch_rtnl(struct list_head * list_net,struct list_head * dev_to_kill)607 static void __net_exit ipip_exit_batch_rtnl(struct list_head *list_net,
608 struct list_head *dev_to_kill)
609 {
610 ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops,
611 dev_to_kill);
612 }
613
614 static struct pernet_operations ipip_net_ops = {
615 .init = ipip_init_net,
616 .exit_batch_rtnl = ipip_exit_batch_rtnl,
617 .id = &ipip_net_id,
618 .size = sizeof(struct ip_tunnel_net),
619 };
620
ipip_init(void)621 static int __init ipip_init(void)
622 {
623 int err;
624
625 pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
626
627 err = register_pernet_device(&ipip_net_ops);
628 if (err < 0)
629 return err;
630 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
631 if (err < 0) {
632 pr_info("%s: can't register tunnel\n", __func__);
633 goto xfrm_tunnel_ipip_failed;
634 }
635 #if IS_ENABLED(CONFIG_MPLS)
636 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
637 if (err < 0) {
638 pr_info("%s: can't register tunnel\n", __func__);
639 goto xfrm_tunnel_mplsip_failed;
640 }
641 #endif
642 err = rtnl_link_register(&ipip_link_ops);
643 if (err < 0)
644 goto rtnl_link_failed;
645
646 out:
647 return err;
648
649 rtnl_link_failed:
650 #if IS_ENABLED(CONFIG_MPLS)
651 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
652 xfrm_tunnel_mplsip_failed:
653
654 #endif
655 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
656 xfrm_tunnel_ipip_failed:
657 unregister_pernet_device(&ipip_net_ops);
658 goto out;
659 }
660
ipip_fini(void)661 static void __exit ipip_fini(void)
662 {
663 rtnl_link_unregister(&ipip_link_ops);
664 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
665 pr_info("%s: can't deregister tunnel\n", __func__);
666 #if IS_ENABLED(CONFIG_MPLS)
667 if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
668 pr_info("%s: can't deregister tunnel\n", __func__);
669 #endif
670 unregister_pernet_device(&ipip_net_ops);
671 }
672
673 module_init(ipip_init);
674 module_exit(ipip_fini);
675 MODULE_DESCRIPTION("IP/IP protocol decoder library");
676 MODULE_LICENSE("GPL");
677 MODULE_ALIAS_RTNL_LINK("ipip");
678 MODULE_ALIAS_NETDEV("tunl0");
679