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[RAMEN9610-20741]UPSTREAM: xfrm: Remove xfrmi interface ID from flowi
[GitHub/MotorolaMobilityLLC/kernel-slsi.git] / net / xfrm / xfrm_interface.c
CommitLineData
6c670b15
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
6c670b15 310 dst_hold(dst);
ab74c777 311 dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id);
6c670b15
SK		 312 if (IS_ERR(dst)) {
313 err = PTR_ERR(dst);
314 dst = NULL;
315 goto tx_err_link_failure;
316 }
317
318 x = dst->xfrm;
319 if (!x)
320 goto tx_err_link_failure;
321
322 if (x->if_id != xi->p.if_id)
323 goto tx_err_link_failure;
324
325 tdev = dst->dev;
326
327 if (tdev == dev) {
328 stats->collisions++;
329 net_warn_ratelimited("%s: Local routing loop detected!\n",
330 xi->p.name);
331 goto tx_err_dst_release;
332 }
333
334 mtu = dst_mtu(dst);
335 if (!skb->ignore_df && skb->len > mtu) {
336 skb_dst_update_pmtu(skb, mtu);
337
338 if (skb->protocol == htons(ETH_P_IPV6)) {
339 if (mtu < IPV6_MIN_MTU)
340 mtu = IPV6_MIN_MTU;
341
342 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
343 } else {
344 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
345 htonl(mtu));
346 }
347
348 dst_release(dst);
349 return -EMSGSIZE;
350 }
351
352 xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev)));
353 skb_dst_set(skb, dst);
354 skb->dev = tdev;
355
356 err = dst_output(xi->net, skb->sk, skb);
357 if (net_xmit_eval(err) == 0) {
358 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
359
360 u64_stats_update_begin(&tstats->syncp);
361 tstats->tx_bytes += length;
362 tstats->tx_packets++;
363 u64_stats_update_end(&tstats->syncp);
364 } else {
365 stats->tx_errors++;
366 stats->tx_aborted_errors++;
367 }
368
369 return 0;
370tx_err_link_failure:
371 stats->tx_carrier_errors++;
372 dst_link_failure(skb);
373tx_err_dst_release:
374 dst_release(dst);
375 return err;
376}
377
378static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev)
379{
380 struct xfrm_if *xi = netdev_priv(dev);
381 struct net_device_stats *stats = &xi->dev->stats;
382 struct flowi fl;
383 int ret;
384
385 memset(&fl, 0, sizeof(fl));
386
387 switch (skb->protocol) {
388 case htons(ETH_P_IPV6):
389 xfrm_decode_session(skb, &fl, AF_INET6);
390 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
391 break;
392 case htons(ETH_P_IP):
393 xfrm_decode_session(skb, &fl, AF_INET);
394 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
395 break;
396 default:
397 goto tx_err;
398 }
399
400 fl.flowi_oif = xi->phydev->ifindex;
401
402 ret = xfrmi_xmit2(skb, dev, &fl);
403 if (ret < 0)
404 goto tx_err;
405
406 return NETDEV_TX_OK;
407
408tx_err:
409 stats->tx_errors++;
410 stats->tx_dropped++;
411 kfree_skb(skb);
412 return NETDEV_TX_OK;
413}
414
415static int xfrmi4_err(struct sk_buff *skb, u32 info)
416{
417 const struct iphdr *iph = (const struct iphdr *)skb->data;
418 struct net *net = dev_net(skb->dev);
419 int protocol = iph->protocol;
420 struct ip_comp_hdr *ipch;
421 struct ip_esp_hdr *esph;
422 struct ip_auth_hdr *ah ;
423 struct xfrm_state *x;
424 struct xfrm_if *xi;
425 __be32 spi;
426
427 switch (protocol) {
428 case IPPROTO_ESP:
429 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
430 spi = esph->spi;
431 break;
432 case IPPROTO_AH:
433 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
434 spi = ah->spi;
435 break;
436 case IPPROTO_COMP:
437 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
438 spi = htonl(ntohs(ipch->cpi));
439 break;
440 default:
441 return 0;
442 }
443
444 switch (icmp_hdr(skb)->type) {
445 case ICMP_DEST_UNREACH:
446 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
447 return 0;
448 case ICMP_REDIRECT:
449 break;
450 default:
451 return 0;
452 }
453
454 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
455 spi, protocol, AF_INET);
456 if (!x)
457 return 0;
458
459 xi = xfrmi_lookup(net, x);
460 if (!xi) {
461 xfrm_state_put(x);
462 return -1;
463 }
464
465 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
466 ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
467 else
468 ipv4_redirect(skb, net, 0, 0, protocol, 0);
469 xfrm_state_put(x);
470
471 return 0;
472}
473
474static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
475 u8 type, u8 code, int offset, __be32 info)
476{
477 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
478 struct net *net = dev_net(skb->dev);
479 int protocol = iph->nexthdr;
480 struct ip_comp_hdr *ipch;
481 struct ip_esp_hdr *esph;
482 struct ip_auth_hdr *ah;
483 struct xfrm_state *x;
484 struct xfrm_if *xi;
485 __be32 spi;
486
487 switch (protocol) {
488 case IPPROTO_ESP:
489 esph = (struct ip_esp_hdr *)(skb->data + offset);
490 spi = esph->spi;
491 break;
492 case IPPROTO_AH:
493 ah = (struct ip_auth_hdr *)(skb->data + offset);
494 spi = ah->spi;
495 break;
496 case IPPROTO_COMP:
497 ipch = (struct ip_comp_hdr *)(skb->data + offset);
498 spi = htonl(ntohs(ipch->cpi));
499 break;
500 default:
501 return 0;
502 }
503
504 if (type != ICMPV6_PKT_TOOBIG &&
505 type != NDISC_REDIRECT)
506 return 0;
507
508 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
509 spi, protocol, AF_INET6);
510 if (!x)
511 return 0;
512
513 xi = xfrmi_lookup(net, x);
514 if (!xi) {
515 xfrm_state_put(x);
516 return -1;
517 }
518
519 if (type == NDISC_REDIRECT)
520 ip6_redirect(skb, net, skb->dev->ifindex, 0,
521 sock_net_uid(net, NULL));
522 else
523 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
524 xfrm_state_put(x);
525
526 return 0;
527}
528
529static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p)
530{
531 if (xi->p.link != p->link)
532 return -EINVAL;
533
534 xi->p.if_id = p->if_id;
535
536 return 0;
537}
538
539static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p)
540{
541 struct net *net = dev_net(xi->dev);
542 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
543 int err;
544
545 xfrmi_unlink(xfrmn, xi);
546 synchronize_net();
547 err = xfrmi_change(xi, p);
548 xfrmi_link(xfrmn, xi);
549 netdev_state_change(xi->dev);
550 return err;
551}
552
553static void xfrmi_get_stats64(struct net_device *dev,
554 struct rtnl_link_stats64 *s)
555{
556 int cpu;
557
558 if (!dev->tstats)
559 return;
560
561 for_each_possible_cpu(cpu) {
562 struct pcpu_sw_netstats *stats;
563 struct pcpu_sw_netstats tmp;
564 int start;
565
566 stats = per_cpu_ptr(dev->tstats, cpu);
567 do {
568 start = u64_stats_fetch_begin_irq(&stats->syncp);
569 tmp.rx_packets = stats->rx_packets;
570 tmp.rx_bytes = stats->rx_bytes;
571 tmp.tx_packets = stats->tx_packets;
572 tmp.tx_bytes = stats->tx_bytes;
573 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
574
575 s->rx_packets += tmp.rx_packets;
576 s->rx_bytes += tmp.rx_bytes;
577 s->tx_packets += tmp.tx_packets;
578 s->tx_bytes += tmp.tx_bytes;
579 }
580
581 s->rx_dropped = dev->stats.rx_dropped;
582 s->tx_dropped = dev->stats.tx_dropped;
583}
584
585static int xfrmi_get_iflink(const struct net_device *dev)
586{
587 struct xfrm_if *xi = netdev_priv(dev);
588
589 return xi->phydev->ifindex;
590}
591
592
593static const struct net_device_ops xfrmi_netdev_ops = {
594 .ndo_init = xfrmi_dev_init,
595 .ndo_uninit = xfrmi_dev_uninit,
596 .ndo_start_xmit = xfrmi_xmit,
597 .ndo_get_stats64 = xfrmi_get_stats64,
598 .ndo_get_iflink = xfrmi_get_iflink,
599};
600
601static void xfrmi_dev_setup(struct net_device *dev)
602{
603 dev->netdev_ops = &xfrmi_netdev_ops;
604 dev->type = ARPHRD_NONE;
605 dev->hard_header_len = ETH_HLEN;
606 dev->min_header_len = ETH_HLEN;
607 dev->mtu = ETH_DATA_LEN;
608 dev->min_mtu = ETH_MIN_MTU;
609 dev->max_mtu = ETH_DATA_LEN;
610 dev->addr_len = ETH_ALEN;
611 dev->flags = IFF_NOARP;
612 dev->needs_free_netdev = true;
613 dev->priv_destructor = xfrmi_dev_free;
614 netif_keep_dst(dev);
615}
616
617static int xfrmi_dev_init(struct net_device *dev)
618{
619 struct xfrm_if *xi = netdev_priv(dev);
620 struct net_device *phydev = xi->phydev;
621 int err;
622
623 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
624 if (!dev->tstats)
625 return -ENOMEM;
626
627 err = gro_cells_init(&xi->gro_cells, dev);
628 if (err) {
629 free_percpu(dev->tstats);
630 return err;
631 }
632
633 dev->features |= NETIF_F_LLTX;
634
635 dev->needed_headroom = phydev->needed_headroom;
636 dev->needed_tailroom = phydev->needed_tailroom;
637
638 if (is_zero_ether_addr(dev->dev_addr))
639 eth_hw_addr_inherit(dev, phydev);
640 if (is_zero_ether_addr(dev->broadcast))
641 memcpy(dev->broadcast, phydev->broadcast, dev->addr_len);
642
643 return 0;
644}
645
646static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[],
647 struct netlink_ext_ack *extack)
648{
649 return 0;
650}
651
652static void xfrmi_netlink_parms(struct nlattr *data[],
653 struct xfrm_if_parms *parms)
654{
655 memset(parms, 0, sizeof(*parms));
656
657 if (!data)
658 return;
659
660 if (data[IFLA_XFRM_LINK])
661 parms->link = nla_get_u32(data[IFLA_XFRM_LINK]);
662
663 if (data[IFLA_XFRM_IF_ID])
664 parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]);
665}
666
667static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
668 struct nlattr *tb[], struct nlattr *data[],
669 struct netlink_ext_ack *extack)
670{
671 struct net *net = dev_net(dev);
672 struct xfrm_if_parms *p;
673 struct xfrm_if *xi;
674
675 xi = netdev_priv(dev);
676 p = &xi->p;
677
678 xfrmi_netlink_parms(data, p);
679
680 if (!tb[IFLA_IFNAME])
681 return -EINVAL;
682
683 nla_strlcpy(p->name, tb[IFLA_IFNAME], IFNAMSIZ);
684
685 if (!xfrmi_locate(net, p, 1))
686 return -EEXIST;
687
688 return 0;
689}
690
691static void xfrmi_dellink(struct net_device *dev, struct list_head *head)
692{
693 unregister_netdevice_queue(dev, head);
694}
695
696static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
697 struct nlattr *data[],
698 struct netlink_ext_ack *extack)
699{
700 struct xfrm_if *xi = netdev_priv(dev);
701 struct net *net = dev_net(dev);
702
703 xfrmi_netlink_parms(data, &xi->p);
704
705 xi = xfrmi_locate(net, &xi->p, 0);
706
707 if (xi) {
708 if (xi->dev != dev)
709 return -EEXIST;
710 } else
711 xi = netdev_priv(dev);
712
713 return xfrmi_update(xi, &xi->p);
714}
715
716static size_t xfrmi_get_size(const struct net_device *dev)
717{
718 return
719 /* IFLA_XFRM_LINK */
720 nla_total_size(4) +
721 /* IFLA_XFRM_IF_ID */
722 nla_total_size(4) +
723 0;
724}
725
726static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev)
727{
728 struct xfrm_if *xi = netdev_priv(dev);
729 struct xfrm_if_parms *parm = &xi->p;
730
731 if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) ||
732 nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id))
733 goto nla_put_failure;
734 return 0;
735
736nla_put_failure:
737 return -EMSGSIZE;
738}
739
740struct net *xfrmi_get_link_net(const struct net_device *dev)
741{
742 struct xfrm_if *xi = netdev_priv(dev);
743
744 return dev_net(xi->phydev);
745}
746
747static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {
748 [IFLA_XFRM_LINK] = { .type = NLA_U32 },
749 [IFLA_XFRM_IF_ID] = { .type = NLA_U32 },
750};
751
752static struct rtnl_link_ops xfrmi_link_ops __read_mostly = {
753 .kind = "xfrm",
754 .maxtype = IFLA_XFRM_MAX,
755 .policy = xfrmi_policy,
756 .priv_size = sizeof(struct xfrm_if),
757 .setup = xfrmi_dev_setup,
758 .validate = xfrmi_validate,
759 .newlink = xfrmi_newlink,
760 .dellink = xfrmi_dellink,
761 .changelink = xfrmi_changelink,
762 .get_size = xfrmi_get_size,
763 .fill_info = xfrmi_fill_info,
764 .get_link_net = xfrmi_get_link_net,
765};
766
767static void __net_exit xfrmi_destroy_interfaces(struct xfrmi_net *xfrmn)
768{
769 struct xfrm_if *xi;
770 LIST_HEAD(list);
771
772 xi = rtnl_dereference(xfrmn->xfrmi[0]);
773 if (!xi)
774 return;
775
776 unregister_netdevice_queue(xi->dev, &list);
777 unregister_netdevice_many(&list);
778}
779
780static int __net_init xfrmi_init_net(struct net *net)
781{
782 return 0;
783}
784
785static void __net_exit xfrmi_exit_net(struct net *net)
786{
787 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
788
789 rtnl_lock();
790 xfrmi_destroy_interfaces(xfrmn);
791 rtnl_unlock();
792}
793
794static struct pernet_operations xfrmi_net_ops = {
795 .init = xfrmi_init_net,
796 .exit = xfrmi_exit_net,
797 .id = &xfrmi_net_id,
798 .size = sizeof(struct xfrmi_net),
799};
800
801static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = {
802 .handler = xfrm6_rcv,
803 .cb_handler = xfrmi_rcv_cb,
804 .err_handler = xfrmi6_err,
805 .priority = 10,
806};
807
808static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = {
809 .handler = xfrm6_rcv,
810 .cb_handler = xfrmi_rcv_cb,
811 .err_handler = xfrmi6_err,
812 .priority = 10,
813};
814
815static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = {
816 .handler = xfrm6_rcv,
817 .cb_handler = xfrmi_rcv_cb,
818 .err_handler = xfrmi6_err,
819 .priority = 10,
820};
821
822static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = {
823 .handler = xfrm4_rcv,
824 .input_handler = xfrm_input,
825 .cb_handler = xfrmi_rcv_cb,
826 .err_handler = xfrmi4_err,
827 .priority = 10,
828};
829
830static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = {
831 .handler = xfrm4_rcv,
832 .input_handler = xfrm_input,
833 .cb_handler = xfrmi_rcv_cb,
834 .err_handler = xfrmi4_err,
835 .priority = 10,
836};
837
838static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = {
839 .handler = xfrm4_rcv,
840 .input_handler = xfrm_input,
841 .cb_handler = xfrmi_rcv_cb,
842 .err_handler = xfrmi4_err,
843 .priority = 10,
844};
845
846static int __init xfrmi4_init(void)
847{
848 int err;
849
850 err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP);
851 if (err < 0)
852 goto xfrm_proto_esp_failed;
853 err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH);
854 if (err < 0)
855 goto xfrm_proto_ah_failed;
856 err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
857 if (err < 0)
858 goto xfrm_proto_comp_failed;
859
860 return 0;
861
862xfrm_proto_comp_failed:
863 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
864xfrm_proto_ah_failed:
865 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
866xfrm_proto_esp_failed:
867 return err;
868}
869
870static void xfrmi4_fini(void)
871{
872 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
873 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
874 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
875}
876
877static int __init xfrmi6_init(void)
878{
879 int err;
880
881 err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP);
882 if (err < 0)
883 goto xfrm_proto_esp_failed;
884 err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH);
885 if (err < 0)
886 goto xfrm_proto_ah_failed;
887 err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
888 if (err < 0)
889 goto xfrm_proto_comp_failed;
890
891 return 0;
892
893xfrm_proto_comp_failed:
894 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
895xfrm_proto_ah_failed:
896 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
897xfrm_proto_esp_failed:
898 return err;
899}
900
901static void xfrmi6_fini(void)
902{
903 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
904 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
905 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
906}
907
908static const struct xfrm_if_cb xfrm_if_cb = {
909 .decode_session = xfrmi_decode_session,
910};
911
912static int __init xfrmi_init(void)
913{
914 const char *msg;
915 int err;
916
917 pr_info("IPsec XFRM device driver\n");
918
919 msg = "tunnel device";
920 err = register_pernet_device(&xfrmi_net_ops);
921 if (err < 0)
922 goto pernet_dev_failed;
923
924 msg = "xfrm4 protocols";
925 err = xfrmi4_init();
926 if (err < 0)
927 goto xfrmi4_failed;
928
929 msg = "xfrm6 protocols";
930 err = xfrmi6_init();
931 if (err < 0)
932 goto xfrmi6_failed;
933
934
935 msg = "netlink interface";
936 err = rtnl_link_register(&xfrmi_link_ops);
937 if (err < 0)
938 goto rtnl_link_failed;
939
940 xfrm_if_register_cb(&xfrm_if_cb);
941
942 return err;
943
944rtnl_link_failed:
945 xfrmi6_fini();
946xfrmi6_failed:
947 xfrmi4_fini();
948xfrmi4_failed:
949 unregister_pernet_device(&xfrmi_net_ops);
950pernet_dev_failed:
951 pr_err("xfrmi init: failed to register %s\n", msg);
952 return err;
953}
954
955static void __exit xfrmi_fini(void)
956{
957 xfrm_if_unregister_cb();
958 rtnl_link_unregister(&xfrmi_link_ops);
959 xfrmi4_fini();
960 xfrmi6_fini();
961 unregister_pernet_device(&xfrmi_net_ops);
962}
963
964module_init(xfrmi_init);
965module_exit(xfrmi_fini);
966MODULE_LICENSE("GPL");
967MODULE_ALIAS_RTNL_LINK("xfrm");
968MODULE_ALIAS_NETDEV("xfrm0");
969MODULE_AUTHOR("Steffen Klassert");
970MODULE_DESCRIPTION("XFRM virtual interface");
Motorola kernel-slsi