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xfrm: Add virtual xfrm interfaces
[linux-block.git] / net / xfrm / xfrm_interface.c
CommitLineData
f203b76d
SK		 1// SPDX-License-Identifier: GPL-2.0
2/*
3 * XFRM virtual interface
4 *
5 * Copyright (C) 2018 secunet Security Networks AG
6 *
7 * Author:
8 * Steffen Klassert <steffen.klassert@secunet.com>
9 */
10
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/addrconf.h>
41#include <net/xfrm.h>
42#include <net/net_namespace.h>
43#include <net/netns/generic.h>
44#include <linux/etherdevice.h>
45
46static int xfrmi_dev_init(struct net_device *dev);
47static void xfrmi_dev_setup(struct net_device *dev);
48static struct rtnl_link_ops xfrmi_link_ops __read_mostly;
49static unsigned int xfrmi_net_id __read_mostly;
50
51struct xfrmi_net {
52 /* lists for storing interfaces in use */
53 struct xfrm_if __rcu *xfrmi[1];
54};
55
56#define for_each_xfrmi_rcu(start, xi) \
57 for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next))
58
59static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x)
60{
61 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
62 struct xfrm_if *xi;
63
64 for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
65 if (x->if_id == xi->p.if_id &&
66 (xi->dev->flags & IFF_UP))
67 return xi;
68 }
69
70 return NULL;
71}
72
73static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb)
74{
75 struct xfrmi_net *xfrmn;
76 int ifindex;
77 struct xfrm_if *xi;
78
79 if (!skb->dev)
80 return NULL;
81
82 xfrmn = net_generic(dev_net(skb->dev), xfrmi_net_id);
83 ifindex = skb->dev->ifindex;
84
85 for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
86 if (ifindex == xi->dev->ifindex &&
87 (xi->dev->flags & IFF_UP))
88 return xi;
89 }
90
91 return NULL;
92}
93
94static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
95{
96 struct xfrm_if __rcu **xip = &xfrmn->xfrmi[0];
97
98 rcu_assign_pointer(xi->next , rtnl_dereference(*xip));
99 rcu_assign_pointer(*xip, xi);
100}
101
102static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
103{
104 struct xfrm_if __rcu **xip;
105 struct xfrm_if *iter;
106
107 for (xip = &xfrmn->xfrmi[0];
108 (iter = rtnl_dereference(*xip)) != NULL;
109 xip = &iter->next) {
110 if (xi == iter) {
111 rcu_assign_pointer(*xip, xi->next);
112 break;
113 }
114 }
115}
116
117static void xfrmi_dev_free(struct net_device *dev)
118{
119 free_percpu(dev->tstats);
120}
121
122static int xfrmi_create2(struct net_device *dev)
123{
124 struct xfrm_if *xi = netdev_priv(dev);
125 struct net *net = dev_net(dev);
126 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
127 int err;
128
129 dev->rtnl_link_ops = &xfrmi_link_ops;
130 err = register_netdevice(dev);
131 if (err < 0)
132 goto out;
133
134 strcpy(xi->p.name, dev->name);
135
136 dev_hold(dev);
137 xfrmi_link(xfrmn, xi);
138
139 return 0;
140
141out:
142 return err;
143}
144
145static struct xfrm_if *xfrmi_create(struct net *net, struct xfrm_if_parms *p)
146{
147 struct net_device *dev;
148 struct xfrm_if *xi;
149 char name[IFNAMSIZ];
150 int err;
151
152 if (p->name[0])
153 strlcpy(name, p->name, IFNAMSIZ);
154 else
155 goto failed;
156
157 dev = alloc_netdev(sizeof(*xi), name, NET_NAME_UNKNOWN, xfrmi_dev_setup);
158 if (!dev)
159 goto failed;
160
161 dev_net_set(dev, net);
162
163 xi = netdev_priv(dev);
164 xi->p = *p;
165 xi->net = net;
166 xi->dev = dev;
167 xi->phydev = dev_get_by_index(net, p->link);
168 if (!xi->phydev)
169 goto failed_free;
170
171 err = xfrmi_create2(dev);
172 if (err < 0)
173 goto failed_dev_put;
174
175 return xi;
176
177failed_dev_put:
178 dev_put(xi->phydev);
179failed_free:
180 free_netdev(dev);
181failed:
182 return NULL;
183}
184
185static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p,
186 int create)
187{
188 struct xfrm_if __rcu **xip;
189 struct xfrm_if *xi;
190 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
191
192 for (xip = &xfrmn->xfrmi[0];
193 (xi = rtnl_dereference(*xip)) != NULL;
194 xip = &xi->next) {
195 if (xi->p.if_id == p->if_id) {
196 if (create)
197 return NULL;
198
199 return xi;
200 }
201 }
202 if (!create)
203 return NULL;
204 return xfrmi_create(net, p);
205}
206
207static void xfrmi_dev_uninit(struct net_device *dev)
208{
209 struct xfrm_if *xi = netdev_priv(dev);
210 struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id);
211
212 xfrmi_unlink(xfrmn, xi);
213 dev_put(xi->phydev);
214 dev_put(dev);
215}
216
217static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
218{
219 skb->tstamp = 0;
220 skb->pkt_type = PACKET_HOST;
221 skb->skb_iif = 0;
222 skb->ignore_df = 0;
223 skb_dst_drop(skb);
224 nf_reset(skb);
225 nf_reset_trace(skb);
226
227 if (!xnet)
228 return;
229
230 ipvs_reset(skb);
231 secpath_reset(skb);
232 skb_orphan(skb);
233 skb->mark = 0;
234}
235
236static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
237{
238 struct pcpu_sw_netstats *tstats;
239 struct xfrm_mode *inner_mode;
240 struct net_device *dev;
241 struct xfrm_state *x;
242 struct xfrm_if *xi;
243 bool xnet;
244
245 if (err && !skb->sp)
246 return 0;
247
248 x = xfrm_input_state(skb);
249
250 xi = xfrmi_lookup(xs_net(x), x);
251 if (!xi)
252 return 1;
253
254 dev = xi->dev;
255 skb->dev = dev;
256
257 if (err) {
258 dev->stats.rx_errors++;
259 dev->stats.rx_dropped++;
260
261 return 0;
262 }
263
264 xnet = !net_eq(xi->net, dev_net(skb->dev));
265
266 if (xnet) {
267 inner_mode = x->inner_mode;
268
269 if (x->sel.family == AF_UNSPEC) {
270 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
271 if (inner_mode == NULL) {
272 XFRM_INC_STATS(dev_net(skb->dev),
273 LINUX_MIB_XFRMINSTATEMODEERROR);
274 return -EINVAL;
275 }
276 }
277
278 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb,
279 inner_mode->afinfo->family))
280 return -EPERM;
281 }
282
283 xfrmi_scrub_packet(skb, xnet);
284
285 tstats = this_cpu_ptr(dev->tstats);
286
287 u64_stats_update_begin(&tstats->syncp);
288 tstats->rx_packets++;
289 tstats->rx_bytes += skb->len;
290 u64_stats_update_end(&tstats->syncp);
291
292 return 0;
293}
294
295static int
296xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
297{
298 struct xfrm_if *xi = netdev_priv(dev);
299 struct net_device_stats *stats = &xi->dev->stats;
300 struct dst_entry *dst = skb_dst(skb);
301 unsigned int length = skb->len;
302 struct net_device *tdev;
303 struct xfrm_state *x;
304 int err = -1;
305 int mtu;
306
307 if (!dst)
308 goto tx_err_link_failure;
309
310 fl->flowi_xfrm.if_id = xi->p.if_id;
311
312 dst_hold(dst);
313 dst = xfrm_lookup(xi->net, dst, fl, NULL, 0);
314 if (IS_ERR(dst)) {
315 err = PTR_ERR(dst);
316 dst = NULL;
317 goto tx_err_link_failure;
318 }
319
320 x = dst->xfrm;
321 if (!x)
322 goto tx_err_link_failure;
323
324 if (x->if_id != xi->p.if_id)
325 goto tx_err_link_failure;
326
327 tdev = dst->dev;
328
329 if (tdev == dev) {
330 stats->collisions++;
331 net_warn_ratelimited("%s: Local routing loop detected!\n",
332 xi->p.name);
333 goto tx_err_dst_release;
334 }
335
336 mtu = dst_mtu(dst);
337 if (!skb->ignore_df && skb->len > mtu) {
338 skb_dst_update_pmtu(skb, mtu);
339
340 if (skb->protocol == htons(ETH_P_IPV6)) {
341 if (mtu < IPV6_MIN_MTU)
342 mtu = IPV6_MIN_MTU;
343
344 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
345 } else {
346 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
347 htonl(mtu));
348 }
349
350 dst_release(dst);
351 return -EMSGSIZE;
352 }
353
354 xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev)));
355 skb_dst_set(skb, dst);
356 skb->dev = tdev;
357
358 err = dst_output(xi->net, skb->sk, skb);
359 if (net_xmit_eval(err) == 0) {
360 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
361
362 u64_stats_update_begin(&tstats->syncp);
363 tstats->tx_bytes += length;
364 tstats->tx_packets++;
365 u64_stats_update_end(&tstats->syncp);
366 } else {
367 stats->tx_errors++;
368 stats->tx_aborted_errors++;
369 }
370
371 return 0;
372tx_err_link_failure:
373 stats->tx_carrier_errors++;
374 dst_link_failure(skb);
375tx_err_dst_release:
376 dst_release(dst);
377 return err;
378}
379
380static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev)
381{
382 struct xfrm_if *xi = netdev_priv(dev);
383 struct net_device_stats *stats = &xi->dev->stats;
384 struct flowi fl;
385 int ret;
386
387 memset(&fl, 0, sizeof(fl));
388
389 switch (skb->protocol) {
390 case htons(ETH_P_IPV6):
391 xfrm_decode_session(skb, &fl, AF_INET6);
392 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
393 break;
394 case htons(ETH_P_IP):
395 xfrm_decode_session(skb, &fl, AF_INET);
396 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
397 break;
398 default:
399 goto tx_err;
400 }
401
402 fl.flowi_oif = xi->phydev->ifindex;
403
404 ret = xfrmi_xmit2(skb, dev, &fl);
405 if (ret < 0)
406 goto tx_err;
407
408 return NETDEV_TX_OK;
409
410tx_err:
411 stats->tx_errors++;
412 stats->tx_dropped++;
413 kfree_skb(skb);
414 return NETDEV_TX_OK;
415}
416
417static int xfrmi4_err(struct sk_buff *skb, u32 info)
418{
419 const struct iphdr *iph = (const struct iphdr *)skb->data;
420 struct net *net = dev_net(skb->dev);
421 int protocol = iph->protocol;
422 struct ip_comp_hdr *ipch;
423 struct ip_esp_hdr *esph;
424 struct ip_auth_hdr *ah ;
425 struct xfrm_state *x;
426 struct xfrm_if *xi;
427 __be32 spi;
428
429 switch (protocol) {
430 case IPPROTO_ESP:
431 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
432 spi = esph->spi;
433 break;
434 case IPPROTO_AH:
435 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
436 spi = ah->spi;
437 break;
438 case IPPROTO_COMP:
439 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
440 spi = htonl(ntohs(ipch->cpi));
441 break;
442 default:
443 return 0;
444 }
445
446 switch (icmp_hdr(skb)->type) {
447 case ICMP_DEST_UNREACH:
448 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
449 return 0;
450 case ICMP_REDIRECT:
451 break;
452 default:
453 return 0;
454 }
455
456 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
457 spi, protocol, AF_INET);
458 if (!x)
459 return 0;
460
461 xi = xfrmi_lookup(net, x);
462 if (!xi) {
463 xfrm_state_put(x);
464 return -1;
465 }
466
467 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
468 ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
469 else
470 ipv4_redirect(skb, net, 0, 0, protocol, 0);
471 xfrm_state_put(x);
472
473 return 0;
474}
475
476static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
477 u8 type, u8 code, int offset, __be32 info)
478{
479 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
480 struct net *net = dev_net(skb->dev);
481 int protocol = iph->nexthdr;
482 struct ip_comp_hdr *ipch;
483 struct ip_esp_hdr *esph;
484 struct ip_auth_hdr *ah;
485 struct xfrm_state *x;
486 struct xfrm_if *xi;
487 __be32 spi;
488
489 switch (protocol) {
490 case IPPROTO_ESP:
491 esph = (struct ip_esp_hdr *)(skb->data + offset);
492 spi = esph->spi;
493 break;
494 case IPPROTO_AH:
495 ah = (struct ip_auth_hdr *)(skb->data + offset);
496 spi = ah->spi;
497 break;
498 case IPPROTO_COMP:
499 ipch = (struct ip_comp_hdr *)(skb->data + offset);
500 spi = htonl(ntohs(ipch->cpi));
501 break;
502 default:
503 return 0;
504 }
505
506 if (type != ICMPV6_PKT_TOOBIG &&
507 type != NDISC_REDIRECT)
508 return 0;
509
510 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
511 spi, protocol, AF_INET6);
512 if (!x)
513 return 0;
514
515 xi = xfrmi_lookup(net, x);
516 if (!xi) {
517 xfrm_state_put(x);
518 return -1;
519 }
520
521 if (type == NDISC_REDIRECT)
522 ip6_redirect(skb, net, skb->dev->ifindex, 0,
523 sock_net_uid(net, NULL));
524 else
525 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
526 xfrm_state_put(x);
527
528 return 0;
529}
530
531static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p)
532{
533 if (xi->p.link != p->link)
534 return -EINVAL;
535
536 xi->p.if_id = p->if_id;
537
538 return 0;
539}
540
541static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p)
542{
543 struct net *net = dev_net(xi->dev);
544 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
545 int err;
546
547 xfrmi_unlink(xfrmn, xi);
548 synchronize_net();
549 err = xfrmi_change(xi, p);
550 xfrmi_link(xfrmn, xi);
551 netdev_state_change(xi->dev);
552 return err;
553}
554
555static void xfrmi_get_stats64(struct net_device *dev,
556 struct rtnl_link_stats64 *s)
557{
558 int cpu;
559
560 if (!dev->tstats)
561 return;
562
563 for_each_possible_cpu(cpu) {
564 struct pcpu_sw_netstats *stats;
565 struct pcpu_sw_netstats tmp;
566 int start;
567
568 stats = per_cpu_ptr(dev->tstats, cpu);
569 do {
570 start = u64_stats_fetch_begin_irq(&stats->syncp);
571 tmp.rx_packets = stats->rx_packets;
572 tmp.rx_bytes = stats->rx_bytes;
573 tmp.tx_packets = stats->tx_packets;
574 tmp.tx_bytes = stats->tx_bytes;
575 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
576
577 s->rx_packets += tmp.rx_packets;
578 s->rx_bytes += tmp.rx_bytes;
579 s->tx_packets += tmp.tx_packets;
580 s->tx_bytes += tmp.tx_bytes;
581 }
582
583 s->rx_dropped = dev->stats.rx_dropped;
584 s->tx_dropped = dev->stats.tx_dropped;
585}
586
587static int xfrmi_get_iflink(const struct net_device *dev)
588{
589 struct xfrm_if *xi = netdev_priv(dev);
590
591 return xi->phydev->ifindex;
592}
593
594
595static const struct net_device_ops xfrmi_netdev_ops = {
596 .ndo_init = xfrmi_dev_init,
597 .ndo_uninit = xfrmi_dev_uninit,
598 .ndo_start_xmit = xfrmi_xmit,
599 .ndo_get_stats64 = xfrmi_get_stats64,
600 .ndo_get_iflink = xfrmi_get_iflink,
601};
602
603static void xfrmi_dev_setup(struct net_device *dev)
604{
605 dev->netdev_ops = &xfrmi_netdev_ops;
606 dev->type = ARPHRD_NONE;
607 dev->hard_header_len = ETH_HLEN;
608 dev->min_header_len = ETH_HLEN;
609 dev->mtu = ETH_DATA_LEN;
610 dev->min_mtu = ETH_MIN_MTU;
611 dev->max_mtu = ETH_DATA_LEN;
612 dev->addr_len = ETH_ALEN;
613 dev->flags = IFF_NOARP;
614 dev->needs_free_netdev = true;
615 dev->priv_destructor = xfrmi_dev_free;
616 netif_keep_dst(dev);
617}
618
619static int xfrmi_dev_init(struct net_device *dev)
620{
621 struct xfrm_if *xi = netdev_priv(dev);
622 struct net_device *phydev = xi->phydev;
623 int err;
624
625 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
626 if (!dev->tstats)
627 return -ENOMEM;
628
629 err = gro_cells_init(&xi->gro_cells, dev);
630 if (err) {
631 free_percpu(dev->tstats);
632 return err;
633 }
634
635 dev->features |= NETIF_F_LLTX;
636
637 dev->needed_headroom = phydev->needed_headroom;
638 dev->needed_tailroom = phydev->needed_tailroom;
639
640 if (is_zero_ether_addr(dev->dev_addr))
641 eth_hw_addr_inherit(dev, phydev);
642 if (is_zero_ether_addr(dev->broadcast))
643 memcpy(dev->broadcast, phydev->broadcast, dev->addr_len);
644
645 return 0;
646}
647
648static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[],
649 struct netlink_ext_ack *extack)
650{
651 return 0;
652}
653
654static void xfrmi_netlink_parms(struct nlattr *data[],
655 struct xfrm_if_parms *parms)
656{
657 memset(parms, 0, sizeof(*parms));
658
659 if (!data)
660 return;
661
662 if (data[IFLA_XFRM_LINK])
663 parms->link = nla_get_u32(data[IFLA_XFRM_LINK]);
664
665 if (data[IFLA_XFRM_IF_ID])
666 parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]);
667}
668
669static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
670 struct nlattr *tb[], struct nlattr *data[],
671 struct netlink_ext_ack *extack)
672{
673 struct net *net = dev_net(dev);
674 struct xfrm_if_parms *p;
675 struct xfrm_if *xi;
676
677 xi = netdev_priv(dev);
678 p = &xi->p;
679
680 xfrmi_netlink_parms(data, p);
681
682 if (!tb[IFLA_IFNAME])
683 return -EINVAL;
684
685 nla_strlcpy(p->name, tb[IFLA_IFNAME], IFNAMSIZ);
686
687 if (!xfrmi_locate(net, p, 1))
688 return -EEXIST;
689
690 return 0;
691}
692
693static void xfrmi_dellink(struct net_device *dev, struct list_head *head)
694{
695 unregister_netdevice_queue(dev, head);
696}
697
698static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
699 struct nlattr *data[],
700 struct netlink_ext_ack *extack)
701{
702 struct xfrm_if *xi = netdev_priv(dev);
703 struct net *net = dev_net(dev);
704
705 xfrmi_netlink_parms(data, &xi->p);
706
707 xi = xfrmi_locate(net, &xi->p, 0);
708
709 if (xi) {
710 if (xi->dev != dev)
711 return -EEXIST;
712 } else
713 xi = netdev_priv(dev);
714
715 return xfrmi_update(xi, &xi->p);
716}
717
718static size_t xfrmi_get_size(const struct net_device *dev)
719{
720 return
721 /* IFLA_XFRM_LINK */
722 nla_total_size(4) +
723 /* IFLA_XFRM_IF_ID */
724 nla_total_size(4) +
725 0;
726}
727
728static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev)
729{
730 struct xfrm_if *xi = netdev_priv(dev);
731 struct xfrm_if_parms *parm = &xi->p;
732
733 if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) ||
734 nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id))
735 goto nla_put_failure;
736 return 0;
737
738nla_put_failure:
739 return -EMSGSIZE;
740}
741
742struct net *xfrmi_get_link_net(const struct net_device *dev)
743{
744 struct xfrm_if *xi = netdev_priv(dev);
745
746 return dev_net(xi->phydev);
747}
748
749static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {
750 [IFLA_XFRM_LINK] = { .type = NLA_U32 },
751 [IFLA_XFRM_IF_ID] = { .type = NLA_U32 },
752};
753
754static struct rtnl_link_ops xfrmi_link_ops __read_mostly = {
755 .kind = "xfrm",
756 .maxtype = IFLA_XFRM_MAX,
757 .policy = xfrmi_policy,
758 .priv_size = sizeof(struct xfrm_if),
759 .setup = xfrmi_dev_setup,
760 .validate = xfrmi_validate,
761 .newlink = xfrmi_newlink,
762 .dellink = xfrmi_dellink,
763 .changelink = xfrmi_changelink,
764 .get_size = xfrmi_get_size,
765 .fill_info = xfrmi_fill_info,
766 .get_link_net = xfrmi_get_link_net,
767};
768
769static void __net_exit xfrmi_destroy_interfaces(struct xfrmi_net *xfrmn)
770{
771 struct xfrm_if *xi;
772 LIST_HEAD(list);
773
774 xi = rtnl_dereference(xfrmn->xfrmi[0]);
775 if (!xi)
776 return;
777
778 unregister_netdevice_queue(xi->dev, &list);
779 unregister_netdevice_many(&list);
780}
781
782static int __net_init xfrmi_init_net(struct net *net)
783{
784 return 0;
785}
786
787static void __net_exit xfrmi_exit_net(struct net *net)
788{
789 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
790
791 rtnl_lock();
792 xfrmi_destroy_interfaces(xfrmn);
793 rtnl_unlock();
794}
795
796static struct pernet_operations xfrmi_net_ops = {
797 .init = xfrmi_init_net,
798 .exit = xfrmi_exit_net,
799 .id = &xfrmi_net_id,
800 .size = sizeof(struct xfrmi_net),
801};
802
803static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = {
804 .handler = xfrm6_rcv,
805 .cb_handler = xfrmi_rcv_cb,
806 .err_handler = xfrmi6_err,
807 .priority = 10,
808};
809
810static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = {
811 .handler = xfrm6_rcv,
812 .cb_handler = xfrmi_rcv_cb,
813 .err_handler = xfrmi6_err,
814 .priority = 10,
815};
816
817static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = {
818 .handler = xfrm6_rcv,
819 .cb_handler = xfrmi_rcv_cb,
820 .err_handler = xfrmi6_err,
821 .priority = 10,
822};
823
824static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = {
825 .handler = xfrm4_rcv,
826 .input_handler = xfrm_input,
827 .cb_handler = xfrmi_rcv_cb,
828 .err_handler = xfrmi4_err,
829 .priority = 10,
830};
831
832static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = {
833 .handler = xfrm4_rcv,
834 .input_handler = xfrm_input,
835 .cb_handler = xfrmi_rcv_cb,
836 .err_handler = xfrmi4_err,
837 .priority = 10,
838};
839
840static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = {
841 .handler = xfrm4_rcv,
842 .input_handler = xfrm_input,
843 .cb_handler = xfrmi_rcv_cb,
844 .err_handler = xfrmi4_err,
845 .priority = 10,
846};
847
848static int __init xfrmi4_init(void)
849{
850 int err;
851
852 err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP);
853 if (err < 0)
854 goto xfrm_proto_esp_failed;
855 err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH);
856 if (err < 0)
857 goto xfrm_proto_ah_failed;
858 err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
859 if (err < 0)
860 goto xfrm_proto_comp_failed;
861
862 return 0;
863
864xfrm_proto_comp_failed:
865 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
866xfrm_proto_ah_failed:
867 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
868xfrm_proto_esp_failed:
869 return err;
870}
871
872static void xfrmi4_fini(void)
873{
874 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
875 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
876 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
877}
878
879static int __init xfrmi6_init(void)
880{
881 int err;
882
883 err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP);
884 if (err < 0)
885 goto xfrm_proto_esp_failed;
886 err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH);
887 if (err < 0)
888 goto xfrm_proto_ah_failed;
889 err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
890 if (err < 0)
891 goto xfrm_proto_comp_failed;
892
893 return 0;
894
895xfrm_proto_comp_failed:
896 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
897xfrm_proto_ah_failed:
898 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
899xfrm_proto_esp_failed:
900 return err;
901}
902
903static void xfrmi6_fini(void)
904{
905 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
906 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
907 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
908}
909
910static const struct xfrm_if_cb xfrm_if_cb = {
911 .decode_session = xfrmi_decode_session,
912};
913
914static int __init xfrmi_init(void)
915{
916 const char *msg;
917 int err;
918
919 pr_info("IPsec XFRM device driver\n");
920
921 msg = "tunnel device";
922 err = register_pernet_device(&xfrmi_net_ops);
923 if (err < 0)
924 goto pernet_dev_failed;
925
926 msg = "xfrm4 protocols";
927 err = xfrmi4_init();
928 if (err < 0)
929 goto xfrmi4_failed;
930
931 msg = "xfrm6 protocols";
932 err = xfrmi6_init();
933 if (err < 0)
934 goto xfrmi6_failed;
935
936
937 msg = "netlink interface";
938 err = rtnl_link_register(&xfrmi_link_ops);
939 if (err < 0)
940 goto rtnl_link_failed;
941
942 xfrm_if_register_cb(&xfrm_if_cb);
943
944 return err;
945
946rtnl_link_failed:
947 xfrmi6_fini();
948xfrmi6_failed:
949 xfrmi4_fini();
950xfrmi4_failed:
951 unregister_pernet_device(&xfrmi_net_ops);
952pernet_dev_failed:
953 pr_err("xfrmi init: failed to register %s\n", msg);
954 return err;
955}
956
957static void __exit xfrmi_fini(void)
958{
959 xfrm_if_unregister_cb();
960 rtnl_link_unregister(&xfrmi_link_ops);
961 xfrmi4_fini();
962 xfrmi6_fini();
963 unregister_pernet_device(&xfrmi_net_ops);
964}
965
966module_init(xfrmi_init);
967module_exit(xfrmi_fini);
968MODULE_LICENSE("GPL");
969MODULE_ALIAS_RTNL_LINK("xfrm");
970MODULE_ALIAS_NETDEV("xfrm0");
971MODULE_AUTHOR("Steffen Klassert");
972MODULE_DESCRIPTION("XFRM virtual interface");
Linux 6.x block layer and io_uring tree(s)