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11#include <linux/module.h>
12#include <linux/capability.h>
13#include <linux/errno.h>
14#include <linux/types.h>
15#include <linux/sockios.h>
16#include <linux/icmp.h>
17#include <linux/if.h>
18#include <linux/in.h>
19#include <linux/ip.h>
20#include <linux/net.h>
21#include <linux/in6.h>
22#include <linux/netdevice.h>
23#include <linux/if_link.h>
24#include <linux/if_arp.h>
25#include <linux/icmpv6.h>
26#include <linux/init.h>
27#include <linux/route.h>
28#include <linux/rtnetlink.h>
29#include <linux/netfilter_ipv6.h>
30#include <linux/slab.h>
31#include <linux/hash.h>
32
33#include <linux/uaccess.h>
34#include <linux/atomic.h>
35
36#include <net/icmp.h>
37#include <net/ip.h>
38#include <net/ipv6.h>
39#include <net/ip6_route.h>
40#include <net/ip_tunnels.h>
41#include <net/addrconf.h>
42#include <net/xfrm.h>
43#include <net/net_namespace.h>
44#include <net/netns/generic.h>
45#include <linux/etherdevice.h>
46
47static int xfrmi_dev_init(struct net_device *dev);
48static void xfrmi_dev_setup(struct net_device *dev);
49static struct rtnl_link_ops xfrmi_link_ops __read_mostly;
50static unsigned int xfrmi_net_id __read_mostly;
51
52struct xfrmi_net {
53
54 struct xfrm_if __rcu *xfrmi[1];
55};
56
57#define for_each_xfrmi_rcu(start, xi) \
58 for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next))
59
60static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x)
61{
62 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
63 struct xfrm_if *xi;
64
65 for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
66 if (x->if_id == xi->p.if_id &&
67 (xi->dev->flags & IFF_UP))
68 return xi;
69 }
70
71 return NULL;
72}
73
74static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb,
75 unsigned short family)
76{
77 struct xfrmi_net *xfrmn;
78 struct xfrm_if *xi;
79 int ifindex = 0;
80
81 if (!secpath_exists(skb) || !skb->dev)
82 return NULL;
83
84 switch (family) {
85 case AF_INET6:
86 ifindex = inet6_sdif(skb);
87 break;
88 case AF_INET:
89 ifindex = inet_sdif(skb);
90 break;
91 }
92 if (!ifindex)
93 ifindex = skb->dev->ifindex;
94
95 xfrmn = net_generic(xs_net(xfrm_input_state(skb)), xfrmi_net_id);
96
97 for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
98 if (ifindex == xi->dev->ifindex &&
99 (xi->dev->flags & IFF_UP))
100 return xi;
101 }
102
103 return NULL;
104}
105
106static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
107{
108 struct xfrm_if __rcu **xip = &xfrmn->xfrmi[0];
109
110 rcu_assign_pointer(xi->next , rtnl_dereference(*xip));
111 rcu_assign_pointer(*xip, xi);
112}
113
114static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
115{
116 struct xfrm_if __rcu **xip;
117 struct xfrm_if *iter;
118
119 for (xip = &xfrmn->xfrmi[0];
120 (iter = rtnl_dereference(*xip)) != NULL;
121 xip = &iter->next) {
122 if (xi == iter) {
123 rcu_assign_pointer(*xip, xi->next);
124 break;
125 }
126 }
127}
128
129static void xfrmi_dev_free(struct net_device *dev)
130{
131 struct xfrm_if *xi = netdev_priv(dev);
132
133 gro_cells_destroy(&xi->gro_cells);
134 free_percpu(dev->tstats);
135}
136
137static int xfrmi_create(struct net_device *dev)
138{
139 struct xfrm_if *xi = netdev_priv(dev);
140 struct net *net = dev_net(dev);
141 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
142 int err;
143
144 dev->rtnl_link_ops = &xfrmi_link_ops;
145 err = register_netdevice(dev);
146 if (err < 0)
147 goto out;
148
149 xfrmi_link(xfrmn, xi);
150
151 return 0;
152
153out:
154 return err;
155}
156
157static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p)
158{
159 struct xfrm_if __rcu **xip;
160 struct xfrm_if *xi;
161 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
162
163 for (xip = &xfrmn->xfrmi[0];
164 (xi = rtnl_dereference(*xip)) != NULL;
165 xip = &xi->next)
166 if (xi->p.if_id == p->if_id)
167 return xi;
168
169 return NULL;
170}
171
172static void xfrmi_dev_uninit(struct net_device *dev)
173{
174 struct xfrm_if *xi = netdev_priv(dev);
175 struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id);
176
177 xfrmi_unlink(xfrmn, xi);
178}
179
180static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
181{
182 skb->tstamp = 0;
183 skb->pkt_type = PACKET_HOST;
184 skb->skb_iif = 0;
185 skb->ignore_df = 0;
186 skb_dst_drop(skb);
187 nf_reset_ct(skb);
188 nf_reset_trace(skb);
189
190 if (!xnet)
191 return;
192
193 ipvs_reset(skb);
194 secpath_reset(skb);
195 skb_orphan(skb);
196 skb->mark = 0;
197}
198
199static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
200{
201 const struct xfrm_mode *inner_mode;
202 struct pcpu_sw_netstats *tstats;
203 struct net_device *dev;
204 struct xfrm_state *x;
205 struct xfrm_if *xi;
206 bool xnet;
207
208 if (err && !secpath_exists(skb))
209 return 0;
210
211 x = xfrm_input_state(skb);
212
213 xi = xfrmi_lookup(xs_net(x), x);
214 if (!xi)
215 return 1;
216
217 dev = xi->dev;
218 skb->dev = dev;
219
220 if (err) {
221 dev->stats.rx_errors++;
222 dev->stats.rx_dropped++;
223
224 return 0;
225 }
226
227 xnet = !net_eq(xi->net, dev_net(skb->dev));
228
229 if (xnet) {
230 inner_mode = &x->inner_mode;
231
232 if (x->sel.family == AF_UNSPEC) {
233 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
234 if (inner_mode == NULL) {
235 XFRM_INC_STATS(dev_net(skb->dev),
236 LINUX_MIB_XFRMINSTATEMODEERROR);
237 return -EINVAL;
238 }
239 }
240
241 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb,
242 inner_mode->family))
243 return -EPERM;
244 }
245
246 xfrmi_scrub_packet(skb, xnet);
247
248 tstats = this_cpu_ptr(dev->tstats);
249
250 u64_stats_update_begin(&tstats->syncp);
251 tstats->rx_packets++;
252 tstats->rx_bytes += skb->len;
253 u64_stats_update_end(&tstats->syncp);
254
255 return 0;
256}
257
258static int
259xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
260{
261 struct xfrm_if *xi = netdev_priv(dev);
262 struct net_device_stats *stats = &xi->dev->stats;
263 struct dst_entry *dst = skb_dst(skb);
264 unsigned int length = skb->len;
265 struct net_device *tdev;
266 struct xfrm_state *x;
267 int err = -1;
268 int mtu;
269
270 dst_hold(dst);
271 dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id);
272 if (IS_ERR(dst)) {
273 err = PTR_ERR(dst);
274 dst = NULL;
275 goto tx_err_link_failure;
276 }
277
278 x = dst->xfrm;
279 if (!x)
280 goto tx_err_link_failure;
281
282 if (x->if_id != xi->p.if_id)
283 goto tx_err_link_failure;
284
285 tdev = dst->dev;
286
287 if (tdev == dev) {
288 stats->collisions++;
289 net_warn_ratelimited("%s: Local routing loop detected!\n",
290 dev->name);
291 goto tx_err_dst_release;
292 }
293
294 mtu = dst_mtu(dst);
295 if (!skb->ignore_df && skb->len > mtu) {
296 skb_dst_update_pmtu_no_confirm(skb, mtu);
297
298 if (skb->protocol == htons(ETH_P_IPV6)) {
299 if (mtu < IPV6_MIN_MTU)
300 mtu = IPV6_MIN_MTU;
301
302 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
303 } else {
304 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
305 htonl(mtu));
306 }
307
308 dst_release(dst);
309 return -EMSGSIZE;
310 }
311
312 xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev)));
313 skb_dst_set(skb, dst);
314 skb->dev = tdev;
315
316 err = dst_output(xi->net, skb->sk, skb);
317 if (net_xmit_eval(err) == 0) {
318 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
319
320 u64_stats_update_begin(&tstats->syncp);
321 tstats->tx_bytes += length;
322 tstats->tx_packets++;
323 u64_stats_update_end(&tstats->syncp);
324 } else {
325 stats->tx_errors++;
326 stats->tx_aborted_errors++;
327 }
328
329 return 0;
330tx_err_link_failure:
331 stats->tx_carrier_errors++;
332 dst_link_failure(skb);
333tx_err_dst_release:
334 dst_release(dst);
335 return err;
336}
337
338static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev)
339{
340 struct xfrm_if *xi = netdev_priv(dev);
341 struct net_device_stats *stats = &xi->dev->stats;
342 struct dst_entry *dst = skb_dst(skb);
343 struct flowi fl;
344 int ret;
345
346 memset(&fl, 0, sizeof(fl));
347
348 switch (skb->protocol) {
349 case htons(ETH_P_IPV6):
350 xfrm_decode_session(skb, &fl, AF_INET6);
351 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
352 if (!dst) {
353 fl.u.ip6.flowi6_oif = dev->ifindex;
354 fl.u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
355 dst = ip6_route_output(dev_net(dev), NULL, &fl.u.ip6);
356 if (dst->error) {
357 dst_release(dst);
358 stats->tx_carrier_errors++;
359 goto tx_err;
360 }
361 skb_dst_set(skb, dst);
362 }
363 break;
364 case htons(ETH_P_IP):
365 xfrm_decode_session(skb, &fl, AF_INET);
366 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
367 if (!dst) {
368 struct rtable *rt;
369
370 fl.u.ip4.flowi4_oif = dev->ifindex;
371 fl.u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
372 rt = __ip_route_output_key(dev_net(dev), &fl.u.ip4);
373 if (IS_ERR(rt)) {
374 stats->tx_carrier_errors++;
375 goto tx_err;
376 }
377 skb_dst_set(skb, &rt->dst);
378 }
379 break;
380 default:
381 goto tx_err;
382 }
383
384 fl.flowi_oif = xi->p.link;
385
386 ret = xfrmi_xmit2(skb, dev, &fl);
387 if (ret < 0)
388 goto tx_err;
389
390 return NETDEV_TX_OK;
391
392tx_err:
393 stats->tx_errors++;
394 stats->tx_dropped++;
395 kfree_skb(skb);
396 return NETDEV_TX_OK;
397}
398
399static int xfrmi4_err(struct sk_buff *skb, u32 info)
400{
401 const struct iphdr *iph = (const struct iphdr *)skb->data;
402 struct net *net = dev_net(skb->dev);
403 int protocol = iph->protocol;
404 struct ip_comp_hdr *ipch;
405 struct ip_esp_hdr *esph;
406 struct ip_auth_hdr *ah ;
407 struct xfrm_state *x;
408 struct xfrm_if *xi;
409 __be32 spi;
410
411 switch (protocol) {
412 case IPPROTO_ESP:
413 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
414 spi = esph->spi;
415 break;
416 case IPPROTO_AH:
417 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
418 spi = ah->spi;
419 break;
420 case IPPROTO_COMP:
421 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
422 spi = htonl(ntohs(ipch->cpi));
423 break;
424 default:
425 return 0;
426 }
427
428 switch (icmp_hdr(skb)->type) {
429 case ICMP_DEST_UNREACH:
430 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
431 return 0;
432 case ICMP_REDIRECT:
433 break;
434 default:
435 return 0;
436 }
437
438 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
439 spi, protocol, AF_INET);
440 if (!x)
441 return 0;
442
443 xi = xfrmi_lookup(net, x);
444 if (!xi) {
445 xfrm_state_put(x);
446 return -1;
447 }
448
449 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
450 ipv4_update_pmtu(skb, net, info, 0, protocol);
451 else
452 ipv4_redirect(skb, net, 0, protocol);
453 xfrm_state_put(x);
454
455 return 0;
456}
457
458static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
459 u8 type, u8 code, int offset, __be32 info)
460{
461 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
462 struct net *net = dev_net(skb->dev);
463 int protocol = iph->nexthdr;
464 struct ip_comp_hdr *ipch;
465 struct ip_esp_hdr *esph;
466 struct ip_auth_hdr *ah;
467 struct xfrm_state *x;
468 struct xfrm_if *xi;
469 __be32 spi;
470
471 switch (protocol) {
472 case IPPROTO_ESP:
473 esph = (struct ip_esp_hdr *)(skb->data + offset);
474 spi = esph->spi;
475 break;
476 case IPPROTO_AH:
477 ah = (struct ip_auth_hdr *)(skb->data + offset);
478 spi = ah->spi;
479 break;
480 case IPPROTO_COMP:
481 ipch = (struct ip_comp_hdr *)(skb->data + offset);
482 spi = htonl(ntohs(ipch->cpi));
483 break;
484 default:
485 return 0;
486 }
487
488 if (type != ICMPV6_PKT_TOOBIG &&
489 type != NDISC_REDIRECT)
490 return 0;
491
492 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
493 spi, protocol, AF_INET6);
494 if (!x)
495 return 0;
496
497 xi = xfrmi_lookup(net, x);
498 if (!xi) {
499 xfrm_state_put(x);
500 return -1;
501 }
502
503 if (type == NDISC_REDIRECT)
504 ip6_redirect(skb, net, skb->dev->ifindex, 0,
505 sock_net_uid(net, NULL));
506 else
507 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
508 xfrm_state_put(x);
509
510 return 0;
511}
512
513static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p)
514{
515 if (xi->p.link != p->link)
516 return -EINVAL;
517
518 xi->p.if_id = p->if_id;
519
520 return 0;
521}
522
523static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p)
524{
525 struct net *net = xi->net;
526 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
527 int err;
528
529 xfrmi_unlink(xfrmn, xi);
530 synchronize_net();
531 err = xfrmi_change(xi, p);
532 xfrmi_link(xfrmn, xi);
533 netdev_state_change(xi->dev);
534 return err;
535}
536
537static void xfrmi_get_stats64(struct net_device *dev,
538 struct rtnl_link_stats64 *s)
539{
540 int cpu;
541
542 for_each_possible_cpu(cpu) {
543 struct pcpu_sw_netstats *stats;
544 struct pcpu_sw_netstats tmp;
545 int start;
546
547 stats = per_cpu_ptr(dev->tstats, cpu);
548 do {
549 start = u64_stats_fetch_begin_irq(&stats->syncp);
550 tmp.rx_packets = stats->rx_packets;
551 tmp.rx_bytes = stats->rx_bytes;
552 tmp.tx_packets = stats->tx_packets;
553 tmp.tx_bytes = stats->tx_bytes;
554 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
555
556 s->rx_packets += tmp.rx_packets;
557 s->rx_bytes += tmp.rx_bytes;
558 s->tx_packets += tmp.tx_packets;
559 s->tx_bytes += tmp.tx_bytes;
560 }
561
562 s->rx_dropped = dev->stats.rx_dropped;
563 s->tx_dropped = dev->stats.tx_dropped;
564}
565
566static int xfrmi_get_iflink(const struct net_device *dev)
567{
568 struct xfrm_if *xi = netdev_priv(dev);
569
570 return xi->p.link;
571}
572
573
574static const struct net_device_ops xfrmi_netdev_ops = {
575 .ndo_init = xfrmi_dev_init,
576 .ndo_uninit = xfrmi_dev_uninit,
577 .ndo_start_xmit = xfrmi_xmit,
578 .ndo_get_stats64 = xfrmi_get_stats64,
579 .ndo_get_iflink = xfrmi_get_iflink,
580};
581
582static void xfrmi_dev_setup(struct net_device *dev)
583{
584 dev->netdev_ops = &xfrmi_netdev_ops;
585 dev->header_ops = &ip_tunnel_header_ops;
586 dev->type = ARPHRD_NONE;
587 dev->mtu = ETH_DATA_LEN;
588 dev->min_mtu = ETH_MIN_MTU;
589 dev->max_mtu = IP_MAX_MTU;
590 dev->flags = IFF_NOARP;
591 dev->needs_free_netdev = true;
592 dev->priv_destructor = xfrmi_dev_free;
593 netif_keep_dst(dev);
594
595 eth_broadcast_addr(dev->broadcast);
596}
597
598static int xfrmi_dev_init(struct net_device *dev)
599{
600 struct xfrm_if *xi = netdev_priv(dev);
601 struct net_device *phydev = __dev_get_by_index(xi->net, xi->p.link);
602 int err;
603
604 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
605 if (!dev->tstats)
606 return -ENOMEM;
607
608 err = gro_cells_init(&xi->gro_cells, dev);
609 if (err) {
610 free_percpu(dev->tstats);
611 return err;
612 }
613
614 dev->features |= NETIF_F_LLTX;
615
616 if (phydev) {
617 dev->needed_headroom = phydev->needed_headroom;
618 dev->needed_tailroom = phydev->needed_tailroom;
619
620 if (is_zero_ether_addr(dev->dev_addr))
621 eth_hw_addr_inherit(dev, phydev);
622 if (is_zero_ether_addr(dev->broadcast))
623 memcpy(dev->broadcast, phydev->broadcast,
624 dev->addr_len);
625 } else {
626 eth_hw_addr_random(dev);
627 eth_broadcast_addr(dev->broadcast);
628 }
629
630 return 0;
631}
632
633static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[],
634 struct netlink_ext_ack *extack)
635{
636 return 0;
637}
638
639static void xfrmi_netlink_parms(struct nlattr *data[],
640 struct xfrm_if_parms *parms)
641{
642 memset(parms, 0, sizeof(*parms));
643
644 if (!data)
645 return;
646
647 if (data[IFLA_XFRM_LINK])
648 parms->link = nla_get_u32(data[IFLA_XFRM_LINK]);
649
650 if (data[IFLA_XFRM_IF_ID])
651 parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]);
652}
653
654static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
655 struct nlattr *tb[], struct nlattr *data[],
656 struct netlink_ext_ack *extack)
657{
658 struct net *net = dev_net(dev);
659 struct xfrm_if_parms p;
660 struct xfrm_if *xi;
661 int err;
662
663 xfrmi_netlink_parms(data, &p);
664 xi = xfrmi_locate(net, &p);
665 if (xi)
666 return -EEXIST;
667
668 xi = netdev_priv(dev);
669 xi->p = p;
670 xi->net = net;
671 xi->dev = dev;
672
673 err = xfrmi_create(dev);
674 return err;
675}
676
677static void xfrmi_dellink(struct net_device *dev, struct list_head *head)
678{
679 unregister_netdevice_queue(dev, head);
680}
681
682static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
683 struct nlattr *data[],
684 struct netlink_ext_ack *extack)
685{
686 struct xfrm_if *xi = netdev_priv(dev);
687 struct net *net = xi->net;
688 struct xfrm_if_parms p;
689
690 xfrmi_netlink_parms(data, &p);
691 xi = xfrmi_locate(net, &p);
692 if (!xi) {
693 xi = netdev_priv(dev);
694 } else {
695 if (xi->dev != dev)
696 return -EEXIST;
697 }
698
699 return xfrmi_update(xi, &p);
700}
701
702static size_t xfrmi_get_size(const struct net_device *dev)
703{
704 return
705
706 nla_total_size(4) +
707
708 nla_total_size(4) +
709 0;
710}
711
712static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev)
713{
714 struct xfrm_if *xi = netdev_priv(dev);
715 struct xfrm_if_parms *parm = &xi->p;
716
717 if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) ||
718 nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id))
719 goto nla_put_failure;
720 return 0;
721
722nla_put_failure:
723 return -EMSGSIZE;
724}
725
726static struct net *xfrmi_get_link_net(const struct net_device *dev)
727{
728 struct xfrm_if *xi = netdev_priv(dev);
729
730 return xi->net;
731}
732
733static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {
734 [IFLA_XFRM_LINK] = { .type = NLA_U32 },
735 [IFLA_XFRM_IF_ID] = { .type = NLA_U32 },
736};
737
738static struct rtnl_link_ops xfrmi_link_ops __read_mostly = {
739 .kind = "xfrm",
740 .maxtype = IFLA_XFRM_MAX,
741 .policy = xfrmi_policy,
742 .priv_size = sizeof(struct xfrm_if),
743 .setup = xfrmi_dev_setup,
744 .validate = xfrmi_validate,
745 .newlink = xfrmi_newlink,
746 .dellink = xfrmi_dellink,
747 .changelink = xfrmi_changelink,
748 .get_size = xfrmi_get_size,
749 .fill_info = xfrmi_fill_info,
750 .get_link_net = xfrmi_get_link_net,
751};
752
753static void __net_exit xfrmi_exit_batch_net(struct list_head *net_exit_list)
754{
755 struct net *net;
756 LIST_HEAD(list);
757
758 rtnl_lock();
759 list_for_each_entry(net, net_exit_list, exit_list) {
760 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
761 struct xfrm_if __rcu **xip;
762 struct xfrm_if *xi;
763
764 for (xip = &xfrmn->xfrmi[0];
765 (xi = rtnl_dereference(*xip)) != NULL;
766 xip = &xi->next)
767 unregister_netdevice_queue(xi->dev, &list);
768 }
769 unregister_netdevice_many(&list);
770 rtnl_unlock();
771}
772
773static struct pernet_operations xfrmi_net_ops = {
774 .exit_batch = xfrmi_exit_batch_net,
775 .id = &xfrmi_net_id,
776 .size = sizeof(struct xfrmi_net),
777};
778
779static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = {
780 .handler = xfrm6_rcv,
781 .input_handler = xfrm_input,
782 .cb_handler = xfrmi_rcv_cb,
783 .err_handler = xfrmi6_err,
784 .priority = 10,
785};
786
787static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = {
788 .handler = xfrm6_rcv,
789 .input_handler = xfrm_input,
790 .cb_handler = xfrmi_rcv_cb,
791 .err_handler = xfrmi6_err,
792 .priority = 10,
793};
794
795static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = {
796 .handler = xfrm6_rcv,
797 .input_handler = xfrm_input,
798 .cb_handler = xfrmi_rcv_cb,
799 .err_handler = xfrmi6_err,
800 .priority = 10,
801};
802
803static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = {
804 .handler = xfrm4_rcv,
805 .input_handler = xfrm_input,
806 .cb_handler = xfrmi_rcv_cb,
807 .err_handler = xfrmi4_err,
808 .priority = 10,
809};
810
811static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = {
812 .handler = xfrm4_rcv,
813 .input_handler = xfrm_input,
814 .cb_handler = xfrmi_rcv_cb,
815 .err_handler = xfrmi4_err,
816 .priority = 10,
817};
818
819static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = {
820 .handler = xfrm4_rcv,
821 .input_handler = xfrm_input,
822 .cb_handler = xfrmi_rcv_cb,
823 .err_handler = xfrmi4_err,
824 .priority = 10,
825};
826
827static int __init xfrmi4_init(void)
828{
829 int err;
830
831 err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP);
832 if (err < 0)
833 goto xfrm_proto_esp_failed;
834 err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH);
835 if (err < 0)
836 goto xfrm_proto_ah_failed;
837 err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
838 if (err < 0)
839 goto xfrm_proto_comp_failed;
840
841 return 0;
842
843xfrm_proto_comp_failed:
844 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
845xfrm_proto_ah_failed:
846 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
847xfrm_proto_esp_failed:
848 return err;
849}
850
851static void xfrmi4_fini(void)
852{
853 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
854 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
855 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
856}
857
858static int __init xfrmi6_init(void)
859{
860 int err;
861
862 err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP);
863 if (err < 0)
864 goto xfrm_proto_esp_failed;
865 err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH);
866 if (err < 0)
867 goto xfrm_proto_ah_failed;
868 err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
869 if (err < 0)
870 goto xfrm_proto_comp_failed;
871
872 return 0;
873
874xfrm_proto_comp_failed:
875 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
876xfrm_proto_ah_failed:
877 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
878xfrm_proto_esp_failed:
879 return err;
880}
881
882static void xfrmi6_fini(void)
883{
884 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
885 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
886 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
887}
888
889static const struct xfrm_if_cb xfrm_if_cb = {
890 .decode_session = xfrmi_decode_session,
891};
892
893static int __init xfrmi_init(void)
894{
895 const char *msg;
896 int err;
897
898 pr_info("IPsec XFRM device driver\n");
899
900 msg = "tunnel device";
901 err = register_pernet_device(&xfrmi_net_ops);
902 if (err < 0)
903 goto pernet_dev_failed;
904
905 msg = "xfrm4 protocols";
906 err = xfrmi4_init();
907 if (err < 0)
908 goto xfrmi4_failed;
909
910 msg = "xfrm6 protocols";
911 err = xfrmi6_init();
912 if (err < 0)
913 goto xfrmi6_failed;
914
915
916 msg = "netlink interface";
917 err = rtnl_link_register(&xfrmi_link_ops);
918 if (err < 0)
919 goto rtnl_link_failed;
920
921 xfrm_if_register_cb(&xfrm_if_cb);
922
923 return err;
924
925rtnl_link_failed:
926 xfrmi6_fini();
927xfrmi6_failed:
928 xfrmi4_fini();
929xfrmi4_failed:
930 unregister_pernet_device(&xfrmi_net_ops);
931pernet_dev_failed:
932 pr_err("xfrmi init: failed to register %s\n", msg);
933 return err;
934}
935
936static void __exit xfrmi_fini(void)
937{
938 xfrm_if_unregister_cb();
939 rtnl_link_unregister(&xfrmi_link_ops);
940 xfrmi4_fini();
941 xfrmi6_fini();
942 unregister_pernet_device(&xfrmi_net_ops);
943}
944
945module_init(xfrmi_init);
946module_exit(xfrmi_fini);
947MODULE_LICENSE("GPL");
948MODULE_ALIAS_RTNL_LINK("xfrm");
949MODULE_ALIAS_NETDEV("xfrm0");
950MODULE_AUTHOR("Steffen Klassert");
951MODULE_DESCRIPTION("XFRM virtual interface");
952
