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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/ip_tunnels.h>
41#include <net/addrconf.h>
42#include <net/xfrm.h>
43#include <net/net_namespace.h>
44#include <net/dst_metadata.h>
45#include <net/netns/generic.h>
46#include <linux/etherdevice.h>
47
48static int xfrmi_dev_init(struct net_device *dev);
49static void xfrmi_dev_setup(struct net_device *dev);
50static struct rtnl_link_ops xfrmi_link_ops __read_mostly;
51static unsigned int xfrmi_net_id __read_mostly;
52static const struct net_device_ops xfrmi_netdev_ops;
53
54#define XFRMI_HASH_BITS 8
55#define XFRMI_HASH_SIZE BIT(XFRMI_HASH_BITS)
56
57struct xfrmi_net {
58 /* lists for storing interfaces in use */
59 struct xfrm_if __rcu *xfrmi[XFRMI_HASH_SIZE];
60 struct xfrm_if __rcu *collect_md_xfrmi;
61};
62
63static const struct nla_policy xfrm_lwt_policy[LWT_XFRM_MAX + 1] = {
64 [LWT_XFRM_IF_ID] = NLA_POLICY_MIN(NLA_U32, 1),
65 [LWT_XFRM_LINK] = NLA_POLICY_MIN(NLA_U32, 1),
66};
67
68static void xfrmi_destroy_state(struct lwtunnel_state *lwt)
69{
70}
71
72static int xfrmi_build_state(struct net *net, struct nlattr *nla,
73 unsigned int family, const void *cfg,
74 struct lwtunnel_state **ts,
75 struct netlink_ext_ack *extack)
76{
77 struct nlattr *tb[LWT_XFRM_MAX + 1];
78 struct lwtunnel_state *new_state;
79 struct xfrm_md_info *info;
80 int ret;
81
82 ret = nla_parse_nested(tb, LWT_XFRM_MAX, nla, xfrm_lwt_policy, extack);
83 if (ret < 0)
84 return ret;
85
86 if (!tb[LWT_XFRM_IF_ID]) {
87 NL_SET_ERR_MSG(extack, "if_id must be set");
88 return -EINVAL;
89 }
90
91 new_state = lwtunnel_state_alloc(sizeof(*info));
92 if (!new_state) {
93 NL_SET_ERR_MSG(extack, "failed to create encap info");
94 return -ENOMEM;
95 }
96
97 new_state->type = LWTUNNEL_ENCAP_XFRM;
98
99 info = lwt_xfrm_info(new_state);
100
101 info->if_id = nla_get_u32(tb[LWT_XFRM_IF_ID]);
102
103 if (tb[LWT_XFRM_LINK])
104 info->link = nla_get_u32(tb[LWT_XFRM_LINK]);
105
106 *ts = new_state;
107 return 0;
108}
109
110static int xfrmi_fill_encap_info(struct sk_buff *skb,
111 struct lwtunnel_state *lwt)
112{
113 struct xfrm_md_info *info = lwt_xfrm_info(lwt);
114
115 if (nla_put_u32(skb, LWT_XFRM_IF_ID, info->if_id) ||
116 (info->link && nla_put_u32(skb, LWT_XFRM_LINK, info->link)))
117 return -EMSGSIZE;
118
119 return 0;
120}
121
122static int xfrmi_encap_nlsize(struct lwtunnel_state *lwtstate)
123{
124 return nla_total_size(sizeof(u32)) + /* LWT_XFRM_IF_ID */
125 nla_total_size(sizeof(u32)); /* LWT_XFRM_LINK */
126}
127
128static int xfrmi_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
129{
130 struct xfrm_md_info *a_info = lwt_xfrm_info(a);
131 struct xfrm_md_info *b_info = lwt_xfrm_info(b);
132
133 return memcmp(a_info, b_info, sizeof(*a_info));
134}
135
136static const struct lwtunnel_encap_ops xfrmi_encap_ops = {
137 .build_state = xfrmi_build_state,
138 .destroy_state = xfrmi_destroy_state,
139 .fill_encap = xfrmi_fill_encap_info,
140 .get_encap_size = xfrmi_encap_nlsize,
141 .cmp_encap = xfrmi_encap_cmp,
142 .owner = THIS_MODULE,
143};
144
145#define for_each_xfrmi_rcu(start, xi) \
146 for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next))
147
148static u32 xfrmi_hash(u32 if_id)
149{
150 return hash_32(if_id, XFRMI_HASH_BITS);
151}
152
153static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x)
154{
155 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
156 struct xfrm_if *xi;
157
158 for_each_xfrmi_rcu(xfrmn->xfrmi[xfrmi_hash(x->if_id)], xi) {
159 if (x->if_id == xi->p.if_id &&
160 (xi->dev->flags & IFF_UP))
161 return xi;
162 }
163
164 xi = rcu_dereference(xfrmn->collect_md_xfrmi);
165 if (xi && (xi->dev->flags & IFF_UP))
166 return xi;
167
168 return NULL;
169}
170
171static bool xfrmi_decode_session(struct sk_buff *skb,
172 unsigned short family,
173 struct xfrm_if_decode_session_result *res)
174{
175 struct net_device *dev;
176 struct xfrm_if *xi;
177 int ifindex = 0;
178
179 if (!secpath_exists(skb) || !skb->dev)
180 return false;
181
182 switch (family) {
183 case AF_INET6:
184 ifindex = inet6_sdif(skb);
185 break;
186 case AF_INET:
187 ifindex = inet_sdif(skb);
188 break;
189 }
190
191 if (ifindex) {
192 struct net *net = xs_net(xfrm_input_state(skb));
193
194 dev = dev_get_by_index_rcu(net, ifindex);
195 } else {
196 dev = skb->dev;
197 }
198
199 if (!dev || !(dev->flags & IFF_UP))
200 return false;
201 if (dev->netdev_ops != &xfrmi_netdev_ops)
202 return false;
203
204 xi = netdev_priv(dev);
205 res->net = xi->net;
206
207 if (xi->p.collect_md)
208 res->if_id = xfrm_input_state(skb)->if_id;
209 else
210 res->if_id = xi->p.if_id;
211 return true;
212}
213
214static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
215{
216 struct xfrm_if __rcu **xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)];
217
218 rcu_assign_pointer(xi->next , rtnl_dereference(*xip));
219 rcu_assign_pointer(*xip, xi);
220}
221
222static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
223{
224 struct xfrm_if __rcu **xip;
225 struct xfrm_if *iter;
226
227 for (xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)];
228 (iter = rtnl_dereference(*xip)) != NULL;
229 xip = &iter->next) {
230 if (xi == iter) {
231 rcu_assign_pointer(*xip, xi->next);
232 break;
233 }
234 }
235}
236
237static void xfrmi_dev_free(struct net_device *dev)
238{
239 struct xfrm_if *xi = netdev_priv(dev);
240
241 gro_cells_destroy(&xi->gro_cells);
242 free_percpu(dev->tstats);
243}
244
245static int xfrmi_create(struct net_device *dev)
246{
247 struct xfrm_if *xi = netdev_priv(dev);
248 struct net *net = dev_net(dev);
249 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
250 int err;
251
252 dev->rtnl_link_ops = &xfrmi_link_ops;
253 err = register_netdevice(dev);
254 if (err < 0)
255 goto out;
256
257 if (xi->p.collect_md)
258 rcu_assign_pointer(xfrmn->collect_md_xfrmi, xi);
259 else
260 xfrmi_link(xfrmn, xi);
261
262 return 0;
263
264out:
265 return err;
266}
267
268static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p)
269{
270 struct xfrm_if __rcu **xip;
271 struct xfrm_if *xi;
272 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
273
274 for (xip = &xfrmn->xfrmi[xfrmi_hash(p->if_id)];
275 (xi = rtnl_dereference(*xip)) != NULL;
276 xip = &xi->next)
277 if (xi->p.if_id == p->if_id)
278 return xi;
279
280 return NULL;
281}
282
283static void xfrmi_dev_uninit(struct net_device *dev)
284{
285 struct xfrm_if *xi = netdev_priv(dev);
286 struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id);
287
288 if (xi->p.collect_md)
289 RCU_INIT_POINTER(xfrmn->collect_md_xfrmi, NULL);
290 else
291 xfrmi_unlink(xfrmn, xi);
292}
293
294static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
295{
296 skb_clear_tstamp(skb);
297 skb->pkt_type = PACKET_HOST;
298 skb->skb_iif = 0;
299 skb->ignore_df = 0;
300 skb_dst_drop(skb);
301 nf_reset_ct(skb);
302 nf_reset_trace(skb);
303
304 if (!xnet)
305 return;
306
307 ipvs_reset(skb);
308 secpath_reset(skb);
309 skb_orphan(skb);
310 skb->mark = 0;
311}
312
313static int xfrmi_input(struct sk_buff *skb, int nexthdr, __be32 spi,
314 int encap_type, unsigned short family)
315{
316 struct sec_path *sp;
317
318 sp = skb_sec_path(skb);
319 if (sp && (sp->len || sp->olen) &&
320 !xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family))
321 goto discard;
322
323 XFRM_SPI_SKB_CB(skb)->family = family;
324 if (family == AF_INET) {
325 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
326 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
327 } else {
328 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
329 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
330 }
331
332 return xfrm_input(skb, nexthdr, spi, encap_type);
333discard:
334 kfree_skb(skb);
335 return 0;
336}
337
338static int xfrmi4_rcv(struct sk_buff *skb)
339{
340 return xfrmi_input(skb, ip_hdr(skb)->protocol, 0, 0, AF_INET);
341}
342
343static int xfrmi6_rcv(struct sk_buff *skb)
344{
345 return xfrmi_input(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
346 0, 0, AF_INET6);
347}
348
349static int xfrmi4_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
350{
351 return xfrmi_input(skb, nexthdr, spi, encap_type, AF_INET);
352}
353
354static int xfrmi6_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
355{
356 return xfrmi_input(skb, nexthdr, spi, encap_type, AF_INET6);
357}
358
359static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
360{
361 const struct xfrm_mode *inner_mode;
362 struct net_device *dev;
363 struct xfrm_state *x;
364 struct xfrm_if *xi;
365 bool xnet;
366 int link;
367
368 if (err && !secpath_exists(skb))
369 return 0;
370
371 x = xfrm_input_state(skb);
372
373 xi = xfrmi_lookup(xs_net(x), x);
374 if (!xi)
375 return 1;
376
377 link = skb->dev->ifindex;
378 dev = xi->dev;
379 skb->dev = dev;
380
381 if (err) {
382 dev->stats.rx_errors++;
383 dev->stats.rx_dropped++;
384
385 return 0;
386 }
387
388 xnet = !net_eq(xi->net, dev_net(skb->dev));
389
390 if (xnet) {
391 inner_mode = &x->inner_mode;
392
393 if (x->sel.family == AF_UNSPEC) {
394 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
395 if (inner_mode == NULL) {
396 XFRM_INC_STATS(dev_net(skb->dev),
397 LINUX_MIB_XFRMINSTATEMODEERROR);
398 return -EINVAL;
399 }
400 }
401
402 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb,
403 inner_mode->family))
404 return -EPERM;
405 }
406
407 xfrmi_scrub_packet(skb, xnet);
408 if (xi->p.collect_md) {
409 struct metadata_dst *md_dst;
410
411 md_dst = metadata_dst_alloc(0, METADATA_XFRM, GFP_ATOMIC);
412 if (!md_dst)
413 return -ENOMEM;
414
415 md_dst->u.xfrm_info.if_id = x->if_id;
416 md_dst->u.xfrm_info.link = link;
417 skb_dst_set(skb, (struct dst_entry *)md_dst);
418 }
419 dev_sw_netstats_rx_add(dev, skb->len);
420
421 return 0;
422}
423
424static int
425xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
426{
427 struct xfrm_if *xi = netdev_priv(dev);
428 struct net_device_stats *stats = &xi->dev->stats;
429 struct dst_entry *dst = skb_dst(skb);
430 unsigned int length = skb->len;
431 struct net_device *tdev;
432 struct xfrm_state *x;
433 int err = -1;
434 u32 if_id;
435 int mtu;
436
437 if (xi->p.collect_md) {
438 struct xfrm_md_info *md_info = skb_xfrm_md_info(skb);
439
440 if (unlikely(!md_info))
441 return -EINVAL;
442
443 if_id = md_info->if_id;
444 fl->flowi_oif = md_info->link;
445 if (md_info->dst_orig) {
446 struct dst_entry *tmp_dst = dst;
447
448 dst = md_info->dst_orig;
449 skb_dst_set(skb, dst);
450 md_info->dst_orig = NULL;
451 dst_release(tmp_dst);
452 }
453 } else {
454 if_id = xi->p.if_id;
455 }
456
457 dst_hold(dst);
458 dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, if_id);
459 if (IS_ERR(dst)) {
460 err = PTR_ERR(dst);
461 dst = NULL;
462 goto tx_err_link_failure;
463 }
464
465 x = dst->xfrm;
466 if (!x)
467 goto tx_err_link_failure;
468
469 if (x->if_id != if_id)
470 goto tx_err_link_failure;
471
472 tdev = dst->dev;
473
474 if (tdev == dev) {
475 stats->collisions++;
476 net_warn_ratelimited("%s: Local routing loop detected!\n",
477 dev->name);
478 goto tx_err_dst_release;
479 }
480
481 mtu = dst_mtu(dst);
482 if ((!skb_is_gso(skb) && skb->len > mtu) ||
483 (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu))) {
484 skb_dst_update_pmtu_no_confirm(skb, mtu);
485
486 if (skb->protocol == htons(ETH_P_IPV6)) {
487 if (mtu < IPV6_MIN_MTU)
488 mtu = IPV6_MIN_MTU;
489
490 if (skb->len > 1280)
491 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
492 else
493 goto xmit;
494 } else {
495 if (!(ip_hdr(skb)->frag_off & htons(IP_DF)))
496 goto xmit;
497 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
498 htonl(mtu));
499 }
500
501 dst_release(dst);
502 return -EMSGSIZE;
503 }
504
505xmit:
506 xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev)));
507 skb_dst_set(skb, dst);
508 skb->dev = tdev;
509
510 err = dst_output(xi->net, skb->sk, skb);
511 if (net_xmit_eval(err) == 0) {
512 dev_sw_netstats_tx_add(dev, 1, length);
513 } else {
514 stats->tx_errors++;
515 stats->tx_aborted_errors++;
516 }
517
518 return 0;
519tx_err_link_failure:
520 stats->tx_carrier_errors++;
521 dst_link_failure(skb);
522tx_err_dst_release:
523 dst_release(dst);
524 return err;
525}
526
527static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev)
528{
529 struct xfrm_if *xi = netdev_priv(dev);
530 struct net_device_stats *stats = &xi->dev->stats;
531 struct dst_entry *dst = skb_dst(skb);
532 struct flowi fl;
533 int ret;
534
535 memset(&fl, 0, sizeof(fl));
536
537 switch (skb->protocol) {
538 case htons(ETH_P_IPV6):
539 xfrm_decode_session(skb, &fl, AF_INET6);
540 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
541 if (!dst) {
542 fl.u.ip6.flowi6_oif = dev->ifindex;
543 fl.u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
544 dst = ip6_route_output(dev_net(dev), NULL, &fl.u.ip6);
545 if (dst->error) {
546 dst_release(dst);
547 stats->tx_carrier_errors++;
548 goto tx_err;
549 }
550 skb_dst_set(skb, dst);
551 }
552 break;
553 case htons(ETH_P_IP):
554 xfrm_decode_session(skb, &fl, AF_INET);
555 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
556 if (!dst) {
557 struct rtable *rt;
558
559 fl.u.ip4.flowi4_oif = dev->ifindex;
560 fl.u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
561 rt = __ip_route_output_key(dev_net(dev), &fl.u.ip4);
562 if (IS_ERR(rt)) {
563 stats->tx_carrier_errors++;
564 goto tx_err;
565 }
566 skb_dst_set(skb, &rt->dst);
567 }
568 break;
569 default:
570 goto tx_err;
571 }
572
573 fl.flowi_oif = xi->p.link;
574
575 ret = xfrmi_xmit2(skb, dev, &fl);
576 if (ret < 0)
577 goto tx_err;
578
579 return NETDEV_TX_OK;
580
581tx_err:
582 stats->tx_errors++;
583 stats->tx_dropped++;
584 kfree_skb(skb);
585 return NETDEV_TX_OK;
586}
587
588static int xfrmi4_err(struct sk_buff *skb, u32 info)
589{
590 const struct iphdr *iph = (const struct iphdr *)skb->data;
591 struct net *net = dev_net(skb->dev);
592 int protocol = iph->protocol;
593 struct ip_comp_hdr *ipch;
594 struct ip_esp_hdr *esph;
595 struct ip_auth_hdr *ah ;
596 struct xfrm_state *x;
597 struct xfrm_if *xi;
598 __be32 spi;
599
600 switch (protocol) {
601 case IPPROTO_ESP:
602 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
603 spi = esph->spi;
604 break;
605 case IPPROTO_AH:
606 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
607 spi = ah->spi;
608 break;
609 case IPPROTO_COMP:
610 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
611 spi = htonl(ntohs(ipch->cpi));
612 break;
613 default:
614 return 0;
615 }
616
617 switch (icmp_hdr(skb)->type) {
618 case ICMP_DEST_UNREACH:
619 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
620 return 0;
621 break;
622 case ICMP_REDIRECT:
623 break;
624 default:
625 return 0;
626 }
627
628 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
629 spi, protocol, AF_INET);
630 if (!x)
631 return 0;
632
633 xi = xfrmi_lookup(net, x);
634 if (!xi) {
635 xfrm_state_put(x);
636 return -1;
637 }
638
639 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
640 ipv4_update_pmtu(skb, net, info, 0, protocol);
641 else
642 ipv4_redirect(skb, net, 0, protocol);
643 xfrm_state_put(x);
644
645 return 0;
646}
647
648static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
649 u8 type, u8 code, int offset, __be32 info)
650{
651 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
652 struct net *net = dev_net(skb->dev);
653 int protocol = iph->nexthdr;
654 struct ip_comp_hdr *ipch;
655 struct ip_esp_hdr *esph;
656 struct ip_auth_hdr *ah;
657 struct xfrm_state *x;
658 struct xfrm_if *xi;
659 __be32 spi;
660
661 switch (protocol) {
662 case IPPROTO_ESP:
663 esph = (struct ip_esp_hdr *)(skb->data + offset);
664 spi = esph->spi;
665 break;
666 case IPPROTO_AH:
667 ah = (struct ip_auth_hdr *)(skb->data + offset);
668 spi = ah->spi;
669 break;
670 case IPPROTO_COMP:
671 ipch = (struct ip_comp_hdr *)(skb->data + offset);
672 spi = htonl(ntohs(ipch->cpi));
673 break;
674 default:
675 return 0;
676 }
677
678 if (type != ICMPV6_PKT_TOOBIG &&
679 type != NDISC_REDIRECT)
680 return 0;
681
682 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
683 spi, protocol, AF_INET6);
684 if (!x)
685 return 0;
686
687 xi = xfrmi_lookup(net, x);
688 if (!xi) {
689 xfrm_state_put(x);
690 return -1;
691 }
692
693 if (type == NDISC_REDIRECT)
694 ip6_redirect(skb, net, skb->dev->ifindex, 0,
695 sock_net_uid(net, NULL));
696 else
697 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
698 xfrm_state_put(x);
699
700 return 0;
701}
702
703static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p)
704{
705 if (xi->p.link != p->link)
706 return -EINVAL;
707
708 xi->p.if_id = p->if_id;
709
710 return 0;
711}
712
713static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p)
714{
715 struct net *net = xi->net;
716 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
717 int err;
718
719 xfrmi_unlink(xfrmn, xi);
720 synchronize_net();
721 err = xfrmi_change(xi, p);
722 xfrmi_link(xfrmn, xi);
723 netdev_state_change(xi->dev);
724 return err;
725}
726
727static int xfrmi_get_iflink(const struct net_device *dev)
728{
729 struct xfrm_if *xi = netdev_priv(dev);
730
731 return xi->p.link;
732}
733
734static const struct net_device_ops xfrmi_netdev_ops = {
735 .ndo_init = xfrmi_dev_init,
736 .ndo_uninit = xfrmi_dev_uninit,
737 .ndo_start_xmit = xfrmi_xmit,
738 .ndo_get_stats64 = dev_get_tstats64,
739 .ndo_get_iflink = xfrmi_get_iflink,
740};
741
742static void xfrmi_dev_setup(struct net_device *dev)
743{
744 dev->netdev_ops = &xfrmi_netdev_ops;
745 dev->header_ops = &ip_tunnel_header_ops;
746 dev->type = ARPHRD_NONE;
747 dev->mtu = ETH_DATA_LEN;
748 dev->min_mtu = ETH_MIN_MTU;
749 dev->max_mtu = IP_MAX_MTU;
750 dev->flags = IFF_NOARP;
751 dev->needs_free_netdev = true;
752 dev->priv_destructor = xfrmi_dev_free;
753 netif_keep_dst(dev);
754
755 eth_broadcast_addr(dev->broadcast);
756}
757
758#define XFRMI_FEATURES (NETIF_F_SG | \
759 NETIF_F_FRAGLIST | \
760 NETIF_F_GSO_SOFTWARE | \
761 NETIF_F_HW_CSUM)
762
763static int xfrmi_dev_init(struct net_device *dev)
764{
765 struct xfrm_if *xi = netdev_priv(dev);
766 struct net_device *phydev = __dev_get_by_index(xi->net, xi->p.link);
767 int err;
768
769 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
770 if (!dev->tstats)
771 return -ENOMEM;
772
773 err = gro_cells_init(&xi->gro_cells, dev);
774 if (err) {
775 free_percpu(dev->tstats);
776 return err;
777 }
778
779 dev->features |= NETIF_F_LLTX;
780 dev->features |= XFRMI_FEATURES;
781 dev->hw_features |= XFRMI_FEATURES;
782
783 if (phydev) {
784 dev->needed_headroom = phydev->needed_headroom;
785 dev->needed_tailroom = phydev->needed_tailroom;
786
787 if (is_zero_ether_addr(dev->dev_addr))
788 eth_hw_addr_inherit(dev, phydev);
789 if (is_zero_ether_addr(dev->broadcast))
790 memcpy(dev->broadcast, phydev->broadcast,
791 dev->addr_len);
792 } else {
793 eth_hw_addr_random(dev);
794 eth_broadcast_addr(dev->broadcast);
795 }
796
797 return 0;
798}
799
800static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[],
801 struct netlink_ext_ack *extack)
802{
803 return 0;
804}
805
806static void xfrmi_netlink_parms(struct nlattr *data[],
807 struct xfrm_if_parms *parms)
808{
809 memset(parms, 0, sizeof(*parms));
810
811 if (!data)
812 return;
813
814 if (data[IFLA_XFRM_LINK])
815 parms->link = nla_get_u32(data[IFLA_XFRM_LINK]);
816
817 if (data[IFLA_XFRM_IF_ID])
818 parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]);
819
820 if (data[IFLA_XFRM_COLLECT_METADATA])
821 parms->collect_md = true;
822}
823
824static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
825 struct nlattr *tb[], struct nlattr *data[],
826 struct netlink_ext_ack *extack)
827{
828 struct net *net = dev_net(dev);
829 struct xfrm_if_parms p = {};
830 struct xfrm_if *xi;
831 int err;
832
833 xfrmi_netlink_parms(data, &p);
834 if (p.collect_md) {
835 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
836
837 if (p.link || p.if_id) {
838 NL_SET_ERR_MSG(extack, "link and if_id must be zero");
839 return -EINVAL;
840 }
841
842 if (rtnl_dereference(xfrmn->collect_md_xfrmi))
843 return -EEXIST;
844
845 } else {
846 if (!p.if_id) {
847 NL_SET_ERR_MSG(extack, "if_id must be non zero");
848 return -EINVAL;
849 }
850
851 xi = xfrmi_locate(net, &p);
852 if (xi)
853 return -EEXIST;
854 }
855
856 xi = netdev_priv(dev);
857 xi->p = p;
858 xi->net = net;
859 xi->dev = dev;
860
861 err = xfrmi_create(dev);
862 return err;
863}
864
865static void xfrmi_dellink(struct net_device *dev, struct list_head *head)
866{
867 unregister_netdevice_queue(dev, head);
868}
869
870static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
871 struct nlattr *data[],
872 struct netlink_ext_ack *extack)
873{
874 struct xfrm_if *xi = netdev_priv(dev);
875 struct net *net = xi->net;
876 struct xfrm_if_parms p = {};
877
878 xfrmi_netlink_parms(data, &p);
879 if (!p.if_id) {
880 NL_SET_ERR_MSG(extack, "if_id must be non zero");
881 return -EINVAL;
882 }
883
884 if (p.collect_md) {
885 NL_SET_ERR_MSG(extack, "collect_md can't be changed");
886 return -EINVAL;
887 }
888
889 xi = xfrmi_locate(net, &p);
890 if (!xi) {
891 xi = netdev_priv(dev);
892 } else {
893 if (xi->dev != dev)
894 return -EEXIST;
895 if (xi->p.collect_md) {
896 NL_SET_ERR_MSG(extack,
897 "device can't be changed to collect_md");
898 return -EINVAL;
899 }
900 }
901
902 return xfrmi_update(xi, &p);
903}
904
905static size_t xfrmi_get_size(const struct net_device *dev)
906{
907 return
908 /* IFLA_XFRM_LINK */
909 nla_total_size(4) +
910 /* IFLA_XFRM_IF_ID */
911 nla_total_size(4) +
912 /* IFLA_XFRM_COLLECT_METADATA */
913 nla_total_size(0) +
914 0;
915}
916
917static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev)
918{
919 struct xfrm_if *xi = netdev_priv(dev);
920 struct xfrm_if_parms *parm = &xi->p;
921
922 if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) ||
923 nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id) ||
924 (xi->p.collect_md && nla_put_flag(skb, IFLA_XFRM_COLLECT_METADATA)))
925 goto nla_put_failure;
926 return 0;
927
928nla_put_failure:
929 return -EMSGSIZE;
930}
931
932static struct net *xfrmi_get_link_net(const struct net_device *dev)
933{
934 struct xfrm_if *xi = netdev_priv(dev);
935
936 return xi->net;
937}
938
939static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {
940 [IFLA_XFRM_UNSPEC] = { .strict_start_type = IFLA_XFRM_COLLECT_METADATA },
941 [IFLA_XFRM_LINK] = { .type = NLA_U32 },
942 [IFLA_XFRM_IF_ID] = { .type = NLA_U32 },
943 [IFLA_XFRM_COLLECT_METADATA] = { .type = NLA_FLAG },
944};
945
946static struct rtnl_link_ops xfrmi_link_ops __read_mostly = {
947 .kind = "xfrm",
948 .maxtype = IFLA_XFRM_MAX,
949 .policy = xfrmi_policy,
950 .priv_size = sizeof(struct xfrm_if),
951 .setup = xfrmi_dev_setup,
952 .validate = xfrmi_validate,
953 .newlink = xfrmi_newlink,
954 .dellink = xfrmi_dellink,
955 .changelink = xfrmi_changelink,
956 .get_size = xfrmi_get_size,
957 .fill_info = xfrmi_fill_info,
958 .get_link_net = xfrmi_get_link_net,
959};
960
961static void __net_exit xfrmi_exit_batch_net(struct list_head *net_exit_list)
962{
963 struct net *net;
964 LIST_HEAD(list);
965
966 rtnl_lock();
967 list_for_each_entry(net, net_exit_list, exit_list) {
968 struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
969 struct xfrm_if __rcu **xip;
970 struct xfrm_if *xi;
971 int i;
972
973 for (i = 0; i < XFRMI_HASH_SIZE; i++) {
974 for (xip = &xfrmn->xfrmi[i];
975 (xi = rtnl_dereference(*xip)) != NULL;
976 xip = &xi->next)
977 unregister_netdevice_queue(xi->dev, &list);
978 }
979 xi = rtnl_dereference(xfrmn->collect_md_xfrmi);
980 if (xi)
981 unregister_netdevice_queue(xi->dev, &list);
982 }
983 unregister_netdevice_many(&list);
984 rtnl_unlock();
985}
986
987static struct pernet_operations xfrmi_net_ops = {
988 .exit_batch = xfrmi_exit_batch_net,
989 .id = &xfrmi_net_id,
990 .size = sizeof(struct xfrmi_net),
991};
992
993static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = {
994 .handler = xfrmi6_rcv,
995 .input_handler = xfrmi6_input,
996 .cb_handler = xfrmi_rcv_cb,
997 .err_handler = xfrmi6_err,
998 .priority = 10,
999};
1000
1001static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = {
1002 .handler = xfrm6_rcv,
1003 .input_handler = xfrm_input,
1004 .cb_handler = xfrmi_rcv_cb,
1005 .err_handler = xfrmi6_err,
1006 .priority = 10,
1007};
1008
1009static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = {
1010 .handler = xfrm6_rcv,
1011 .input_handler = xfrm_input,
1012 .cb_handler = xfrmi_rcv_cb,
1013 .err_handler = xfrmi6_err,
1014 .priority = 10,
1015};
1016
1017#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1018static int xfrmi6_rcv_tunnel(struct sk_buff *skb)
1019{
1020 const xfrm_address_t *saddr;
1021 __be32 spi;
1022
1023 saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr;
1024 spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr);
1025
1026 return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL);
1027}
1028
1029static struct xfrm6_tunnel xfrmi_ipv6_handler __read_mostly = {
1030 .handler = xfrmi6_rcv_tunnel,
1031 .cb_handler = xfrmi_rcv_cb,
1032 .err_handler = xfrmi6_err,
1033 .priority = 2,
1034};
1035
1036static struct xfrm6_tunnel xfrmi_ip6ip_handler __read_mostly = {
1037 .handler = xfrmi6_rcv_tunnel,
1038 .cb_handler = xfrmi_rcv_cb,
1039 .err_handler = xfrmi6_err,
1040 .priority = 2,
1041};
1042#endif
1043
1044static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = {
1045 .handler = xfrmi4_rcv,
1046 .input_handler = xfrmi4_input,
1047 .cb_handler = xfrmi_rcv_cb,
1048 .err_handler = xfrmi4_err,
1049 .priority = 10,
1050};
1051
1052static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = {
1053 .handler = xfrm4_rcv,
1054 .input_handler = xfrm_input,
1055 .cb_handler = xfrmi_rcv_cb,
1056 .err_handler = xfrmi4_err,
1057 .priority = 10,
1058};
1059
1060static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = {
1061 .handler = xfrm4_rcv,
1062 .input_handler = xfrm_input,
1063 .cb_handler = xfrmi_rcv_cb,
1064 .err_handler = xfrmi4_err,
1065 .priority = 10,
1066};
1067
1068#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
1069static int xfrmi4_rcv_tunnel(struct sk_buff *skb)
1070{
1071 return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
1072}
1073
1074static struct xfrm_tunnel xfrmi_ipip_handler __read_mostly = {
1075 .handler = xfrmi4_rcv_tunnel,
1076 .cb_handler = xfrmi_rcv_cb,
1077 .err_handler = xfrmi4_err,
1078 .priority = 3,
1079};
1080
1081static struct xfrm_tunnel xfrmi_ipip6_handler __read_mostly = {
1082 .handler = xfrmi4_rcv_tunnel,
1083 .cb_handler = xfrmi_rcv_cb,
1084 .err_handler = xfrmi4_err,
1085 .priority = 2,
1086};
1087#endif
1088
1089static int __init xfrmi4_init(void)
1090{
1091 int err;
1092
1093 err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP);
1094 if (err < 0)
1095 goto xfrm_proto_esp_failed;
1096 err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH);
1097 if (err < 0)
1098 goto xfrm_proto_ah_failed;
1099 err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
1100 if (err < 0)
1101 goto xfrm_proto_comp_failed;
1102#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
1103 err = xfrm4_tunnel_register(&xfrmi_ipip_handler, AF_INET);
1104 if (err < 0)
1105 goto xfrm_tunnel_ipip_failed;
1106 err = xfrm4_tunnel_register(&xfrmi_ipip6_handler, AF_INET6);
1107 if (err < 0)
1108 goto xfrm_tunnel_ipip6_failed;
1109#endif
1110
1111 return 0;
1112
1113#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
1114xfrm_tunnel_ipip6_failed:
1115 xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET);
1116xfrm_tunnel_ipip_failed:
1117 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
1118#endif
1119xfrm_proto_comp_failed:
1120 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
1121xfrm_proto_ah_failed:
1122 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
1123xfrm_proto_esp_failed:
1124 return err;
1125}
1126
1127static void xfrmi4_fini(void)
1128{
1129#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL)
1130 xfrm4_tunnel_deregister(&xfrmi_ipip6_handler, AF_INET6);
1131 xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET);
1132#endif
1133 xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP);
1134 xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH);
1135 xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP);
1136}
1137
1138static int __init xfrmi6_init(void)
1139{
1140 int err;
1141
1142 err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP);
1143 if (err < 0)
1144 goto xfrm_proto_esp_failed;
1145 err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH);
1146 if (err < 0)
1147 goto xfrm_proto_ah_failed;
1148 err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
1149 if (err < 0)
1150 goto xfrm_proto_comp_failed;
1151#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1152 err = xfrm6_tunnel_register(&xfrmi_ipv6_handler, AF_INET6);
1153 if (err < 0)
1154 goto xfrm_tunnel_ipv6_failed;
1155 err = xfrm6_tunnel_register(&xfrmi_ip6ip_handler, AF_INET);
1156 if (err < 0)
1157 goto xfrm_tunnel_ip6ip_failed;
1158#endif
1159
1160 return 0;
1161
1162#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1163xfrm_tunnel_ip6ip_failed:
1164 xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6);
1165xfrm_tunnel_ipv6_failed:
1166 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
1167#endif
1168xfrm_proto_comp_failed:
1169 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
1170xfrm_proto_ah_failed:
1171 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
1172xfrm_proto_esp_failed:
1173 return err;
1174}
1175
1176static void xfrmi6_fini(void)
1177{
1178#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1179 xfrm6_tunnel_deregister(&xfrmi_ip6ip_handler, AF_INET);
1180 xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6);
1181#endif
1182 xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP);
1183 xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH);
1184 xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP);
1185}
1186
1187static const struct xfrm_if_cb xfrm_if_cb = {
1188 .decode_session = xfrmi_decode_session,
1189};
1190
1191static int __init xfrmi_init(void)
1192{
1193 const char *msg;
1194 int err;
1195
1196 pr_info("IPsec XFRM device driver\n");
1197
1198 msg = "tunnel device";
1199 err = register_pernet_device(&xfrmi_net_ops);
1200 if (err < 0)
1201 goto pernet_dev_failed;
1202
1203 msg = "xfrm4 protocols";
1204 err = xfrmi4_init();
1205 if (err < 0)
1206 goto xfrmi4_failed;
1207
1208 msg = "xfrm6 protocols";
1209 err = xfrmi6_init();
1210 if (err < 0)
1211 goto xfrmi6_failed;
1212
1213
1214 msg = "netlink interface";
1215 err = rtnl_link_register(&xfrmi_link_ops);
1216 if (err < 0)
1217 goto rtnl_link_failed;
1218
1219 err = register_xfrm_interface_bpf();
1220 if (err < 0)
1221 goto kfunc_failed;
1222
1223 lwtunnel_encap_add_ops(&xfrmi_encap_ops, LWTUNNEL_ENCAP_XFRM);
1224
1225 xfrm_if_register_cb(&xfrm_if_cb);
1226
1227 return err;
1228
1229kfunc_failed:
1230 rtnl_link_unregister(&xfrmi_link_ops);
1231rtnl_link_failed:
1232 xfrmi6_fini();
1233xfrmi6_failed:
1234 xfrmi4_fini();
1235xfrmi4_failed:
1236 unregister_pernet_device(&xfrmi_net_ops);
1237pernet_dev_failed:
1238 pr_err("xfrmi init: failed to register %s\n", msg);
1239 return err;
1240}
1241
1242static void __exit xfrmi_fini(void)
1243{
1244 xfrm_if_unregister_cb();
1245 lwtunnel_encap_del_ops(&xfrmi_encap_ops, LWTUNNEL_ENCAP_XFRM);
1246 rtnl_link_unregister(&xfrmi_link_ops);
1247 xfrmi4_fini();
1248 xfrmi6_fini();
1249 unregister_pernet_device(&xfrmi_net_ops);
1250}
1251
1252module_init(xfrmi_init);
1253module_exit(xfrmi_fini);
1254MODULE_LICENSE("GPL");
1255MODULE_ALIAS_RTNL_LINK("xfrm");
1256MODULE_ALIAS_NETDEV("xfrm0");
1257MODULE_AUTHOR("Steffen Klassert");
1258MODULE_DESCRIPTION("XFRM virtual interface");