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YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * xfrm_policy.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * Kazunori MIYAZAWA @USAGI
10 * YOSHIFUJI Hideaki
11 * Split up af-specific portion
12 * Derek Atkins <derek@ihtfp.com> Add the post_input processor
Trent Jaegerdf718372005-12-13 23:12:27 -080013 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 */
15
Herbert Xu66cdb3c2007-11-13 21:37:28 -080016#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/slab.h>
18#include <linux/kmod.h>
19#include <linux/list.h>
20#include <linux/spinlock.h>
21#include <linux/workqueue.h>
22#include <linux/notifier.h>
23#include <linux/netdevice.h>
Patrick McHardyeb9c7eb2006-01-06 23:06:30 -080024#include <linux/netfilter.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/module.h>
David S. Miller2518c7c2006-08-24 04:45:07 -070026#include <linux/cache.h>
Paul Moore68277ac2007-12-20 20:49:33 -080027#include <linux/audit.h>
Herbert Xu25ee3282007-12-11 09:32:34 -080028#include <net/dst.h>
Eric Paris6ce74ec2012-02-16 15:08:39 -050029#include <net/flow.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <net/xfrm.h>
31#include <net/ip.h>
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -080032#ifdef CONFIG_XFRM_STATISTICS
33#include <net/snmp.h>
34#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
David S. Miller44e36b42006-08-24 04:50:50 -070036#include "xfrm_hash.h"
37
Steffen Klasserta0073fe2013-02-05 12:52:55 +010038#define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
39#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
40#define XFRM_MAX_QUEUE_LEN 100
41
Steffen Klassertb8c203b2014-09-16 10:08:49 +020042struct xfrm_flo {
43 struct dst_entry *dst_orig;
44 u8 flags;
45};
46
Priyanka Jain418a99a2012-08-12 21:22:29 +000047static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
Florian Westphal37b10382017-02-07 15:00:19 +010048static struct xfrm_policy_afinfo const __rcu *xfrm_policy_afinfo[AF_INET6 + 1]
Priyanka Jain418a99a2012-08-12 21:22:29 +000049 __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Christoph Lametere18b8902006-12-06 20:33:20 -080051static struct kmem_cache *xfrm_dst_cache __read_mostly;
Florian Westphal30846092016-08-11 15:17:54 +020052static __read_mostly seqcount_t xfrm_policy_hash_generation;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Herbert Xu25ee3282007-12-11 09:32:34 -080054static void xfrm_init_pmtu(struct dst_entry *dst);
Timo Teräs80c802f2010-04-07 00:30:05 +000055static int stale_bundle(struct dst_entry *dst);
Steffen Klassert12fdb4d2011-06-29 23:18:20 +000056static int xfrm_bundle_ok(struct xfrm_dst *xdst);
Steffen Klasserta0073fe2013-02-05 12:52:55 +010057static void xfrm_policy_queue_process(unsigned long arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Herbert Xu12bfa8b2014-11-13 17:09:50 +080059static void __xfrm_policy_link(struct xfrm_policy *pol, int dir);
Wei Yongjun29fa0b302008-12-03 00:33:09 -080060static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
61 int dir);
62
Florian Westphale37cc8a2016-08-11 15:17:55 +020063static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy)
64{
65 return atomic_inc_not_zero(&policy->refcnt);
66}
67
David S. Millerbc9b35a2012-05-15 15:04:57 -040068static inline bool
David S. Miller200ce962011-02-24 00:12:25 -050069__xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
Andrew Morton77681022006-11-08 22:46:26 -080070{
David S. Miller7e1dc7b2011-03-12 02:42:11 -050071 const struct flowi4 *fl4 = &fl->u.ip4;
72
Alexey Dobriyan26bff942011-11-22 06:46:02 +000073 return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) &&
74 addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) &&
David S. Miller7e1dc7b2011-03-12 02:42:11 -050075 !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) &&
76 !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) &&
77 (fl4->flowi4_proto == sel->proto || !sel->proto) &&
78 (fl4->flowi4_oif == sel->ifindex || !sel->ifindex);
Andrew Morton77681022006-11-08 22:46:26 -080079}
80
David S. Millerbc9b35a2012-05-15 15:04:57 -040081static inline bool
David S. Miller200ce962011-02-24 00:12:25 -050082__xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl)
Andrew Morton77681022006-11-08 22:46:26 -080083{
David S. Miller7e1dc7b2011-03-12 02:42:11 -050084 const struct flowi6 *fl6 = &fl->u.ip6;
85
86 return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) &&
87 addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) &&
88 !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) &&
89 !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) &&
90 (fl6->flowi6_proto == sel->proto || !sel->proto) &&
91 (fl6->flowi6_oif == sel->ifindex || !sel->ifindex);
Andrew Morton77681022006-11-08 22:46:26 -080092}
93
David S. Millerbc9b35a2012-05-15 15:04:57 -040094bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl,
95 unsigned short family)
Andrew Morton77681022006-11-08 22:46:26 -080096{
97 switch (family) {
98 case AF_INET:
99 return __xfrm4_selector_match(sel, fl);
100 case AF_INET6:
101 return __xfrm6_selector_match(sel, fl);
102 }
David S. Millerbc9b35a2012-05-15 15:04:57 -0400103 return false;
Andrew Morton77681022006-11-08 22:46:26 -0800104}
105
Florian Westphala2817d82017-02-07 15:00:17 +0100106static const struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
Eric Dumazetef8531b2012-08-19 12:31:48 +0200107{
Florian Westphala2817d82017-02-07 15:00:17 +0100108 const struct xfrm_policy_afinfo *afinfo;
Eric Dumazetef8531b2012-08-19 12:31:48 +0200109
Florian Westphala2817d82017-02-07 15:00:17 +0100110 if (unlikely(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
Eric Dumazetef8531b2012-08-19 12:31:48 +0200111 return NULL;
112 rcu_read_lock();
113 afinfo = rcu_dereference(xfrm_policy_afinfo[family]);
114 if (unlikely(!afinfo))
115 rcu_read_unlock();
116 return afinfo;
117}
118
Steffen Klassertd77e38e2017-04-14 10:06:10 +0200119struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif,
120 const xfrm_address_t *saddr,
121 const xfrm_address_t *daddr,
122 int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123{
Florian Westphal37b10382017-02-07 15:00:19 +0100124 const struct xfrm_policy_afinfo *afinfo;
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800125 struct dst_entry *dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Herbert Xu25ee3282007-12-11 09:32:34 -0800127 afinfo = xfrm_policy_get_afinfo(family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 if (unlikely(afinfo == NULL))
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800129 return ERR_PTR(-EAFNOSUPPORT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
David Ahern42a7b322015-08-10 16:58:11 -0600131 dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr);
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900132
Florian Westphalbdba9fe2017-02-07 15:00:18 +0100133 rcu_read_unlock();
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900134
135 return dst;
136}
Steffen Klassertd77e38e2017-04-14 10:06:10 +0200137EXPORT_SYMBOL(__xfrm_dst_lookup);
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900138
David Ahern42a7b322015-08-10 16:58:11 -0600139static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x,
140 int tos, int oif,
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900141 xfrm_address_t *prev_saddr,
142 xfrm_address_t *prev_daddr,
143 int family)
144{
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -0800145 struct net *net = xs_net(x);
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900146 xfrm_address_t *saddr = &x->props.saddr;
147 xfrm_address_t *daddr = &x->id.daddr;
148 struct dst_entry *dst;
149
150 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
151 saddr = x->coaddr;
152 daddr = prev_daddr;
153 }
154 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
155 saddr = prev_saddr;
156 daddr = x->coaddr;
157 }
158
David Ahern42a7b322015-08-10 16:58:11 -0600159 dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family);
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900160
161 if (!IS_ERR(dst)) {
162 if (prev_saddr != saddr)
163 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
164 if (prev_daddr != daddr)
165 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
166 }
167
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800168 return dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171static inline unsigned long make_jiffies(long secs)
172{
173 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
174 return MAX_SCHEDULE_TIMEOUT-1;
175 else
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900176 return secs*HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177}
178
179static void xfrm_policy_timer(unsigned long data)
180{
Weilong Chen3e94c2d2013-12-24 09:43:47 +0800181 struct xfrm_policy *xp = (struct xfrm_policy *)data;
James Morris9d729f72007-03-04 16:12:44 -0800182 unsigned long now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 long next = LONG_MAX;
184 int warn = 0;
185 int dir;
186
187 read_lock(&xp->lock);
188
Timo Teräsea2dea92010-03-31 00:17:05 +0000189 if (unlikely(xp->walk.dead))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 goto out;
191
Herbert Xu77d8d7a2005-10-05 12:15:12 -0700192 dir = xfrm_policy_id2dir(xp->index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194 if (xp->lft.hard_add_expires_seconds) {
195 long tmo = xp->lft.hard_add_expires_seconds +
196 xp->curlft.add_time - now;
197 if (tmo <= 0)
198 goto expired;
199 if (tmo < next)
200 next = tmo;
201 }
202 if (xp->lft.hard_use_expires_seconds) {
203 long tmo = xp->lft.hard_use_expires_seconds +
204 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
205 if (tmo <= 0)
206 goto expired;
207 if (tmo < next)
208 next = tmo;
209 }
210 if (xp->lft.soft_add_expires_seconds) {
211 long tmo = xp->lft.soft_add_expires_seconds +
212 xp->curlft.add_time - now;
213 if (tmo <= 0) {
214 warn = 1;
215 tmo = XFRM_KM_TIMEOUT;
216 }
217 if (tmo < next)
218 next = tmo;
219 }
220 if (xp->lft.soft_use_expires_seconds) {
221 long tmo = xp->lft.soft_use_expires_seconds +
222 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
223 if (tmo <= 0) {
224 warn = 1;
225 tmo = XFRM_KM_TIMEOUT;
226 }
227 if (tmo < next)
228 next = tmo;
229 }
230
231 if (warn)
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -0800232 km_policy_expired(xp, dir, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 if (next != LONG_MAX &&
234 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
235 xfrm_pol_hold(xp);
236
237out:
238 read_unlock(&xp->lock);
239 xfrm_pol_put(xp);
240 return;
241
242expired:
243 read_unlock(&xp->lock);
Herbert Xu4666faa2005-06-18 22:43:22 -0700244 if (!xfrm_policy_delete(xp, dir))
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -0800245 km_policy_expired(xp, dir, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 xfrm_pol_put(xp);
247}
248
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000249static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
250{
251 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
252
253 if (unlikely(pol->walk.dead))
254 flo = NULL;
255 else
256 xfrm_pol_hold(pol);
257
258 return flo;
259}
260
261static int xfrm_policy_flo_check(struct flow_cache_object *flo)
262{
263 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
264
265 return !pol->walk.dead;
266}
267
268static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
269{
270 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
271}
272
273static const struct flow_cache_ops xfrm_policy_fc_ops = {
274 .get = xfrm_policy_flo_get,
275 .check = xfrm_policy_flo_check,
276 .delete = xfrm_policy_flo_delete,
277};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
280 * SPD calls.
281 */
282
Alexey Dobriyan0331b1f2008-11-25 17:21:45 -0800283struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284{
285 struct xfrm_policy *policy;
286
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700287 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289 if (policy) {
Alexey Dobriyan0331b1f2008-11-25 17:21:45 -0800290 write_pnet(&policy->xp_net, net);
Herbert Xu12a169e2008-10-01 07:03:24 -0700291 INIT_LIST_HEAD(&policy->walk.all);
David S. Miller2518c7c2006-08-24 04:45:07 -0700292 INIT_HLIST_NODE(&policy->bydst);
293 INIT_HLIST_NODE(&policy->byidx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 rwlock_init(&policy->lock);
David S. Miller2518c7c2006-08-24 04:45:07 -0700295 atomic_set(&policy->refcnt, 1);
Steffen Klasserta0073fe2013-02-05 12:52:55 +0100296 skb_queue_head_init(&policy->polq.hold_queue);
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -0800297 setup_timer(&policy->timer, xfrm_policy_timer,
298 (unsigned long)policy);
Steffen Klasserta0073fe2013-02-05 12:52:55 +0100299 setup_timer(&policy->polq.hold_timer, xfrm_policy_queue_process,
300 (unsigned long)policy);
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000301 policy->flo.ops = &xfrm_policy_fc_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 }
303 return policy;
304}
305EXPORT_SYMBOL(xfrm_policy_alloc);
306
Eric Dumazet56f04732015-12-08 07:22:01 -0800307static void xfrm_policy_destroy_rcu(struct rcu_head *head)
308{
309 struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu);
310
311 security_xfrm_policy_free(policy->security);
312 kfree(policy);
313}
314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315/* Destroy xfrm_policy: descendant resources must be released to this moment. */
316
WANG Cong64c31b32008-01-07 22:34:29 -0800317void xfrm_policy_destroy(struct xfrm_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
Herbert Xu12a169e2008-10-01 07:03:24 -0700319 BUG_ON(!policy->walk.dead);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Fan Du0659eea2013-08-01 18:08:36 +0800321 if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 BUG();
323
Eric Dumazet56f04732015-12-08 07:22:01 -0800324 call_rcu(&policy->rcu, xfrm_policy_destroy_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325}
WANG Cong64c31b32008-01-07 22:34:29 -0800326EXPORT_SYMBOL(xfrm_policy_destroy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
Alexander Alemayhu1365e547c2017-01-03 17:13:20 +0100328/* Rule must be locked. Release descendant resources, announce
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 * entry dead. The rule must be unlinked from lists to the moment.
330 */
331
332static void xfrm_policy_kill(struct xfrm_policy *policy)
333{
Herbert Xu12a169e2008-10-01 07:03:24 -0700334 policy->walk.dead = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Timo Teräs285ead12010-04-07 00:30:06 +0000336 atomic_inc(&policy->genid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
Steffen Klasserte7d8f6c2013-10-08 10:49:45 +0200338 if (del_timer(&policy->polq.hold_timer))
339 xfrm_pol_put(policy);
Li RongQing1ee5e662015-04-22 15:51:16 +0800340 skb_queue_purge(&policy->polq.hold_queue);
Steffen Klasserta0073fe2013-02-05 12:52:55 +0100341
Timo Teräs285ead12010-04-07 00:30:06 +0000342 if (del_timer(&policy->timer))
343 xfrm_pol_put(policy);
344
345 xfrm_pol_put(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346}
347
David S. Miller2518c7c2006-08-24 04:45:07 -0700348static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
349
Alexey Dobriyane92303f2008-11-25 17:32:41 -0800350static inline unsigned int idx_hash(struct net *net, u32 index)
David S. Miller2518c7c2006-08-24 04:45:07 -0700351{
Alexey Dobriyane92303f2008-11-25 17:32:41 -0800352 return __idx_hash(index, net->xfrm.policy_idx_hmask);
David S. Miller2518c7c2006-08-24 04:45:07 -0700353}
354
Christophe Gouaultb58555f2014-08-29 16:16:04 +0200355/* calculate policy hash thresholds */
356static void __get_hash_thresh(struct net *net,
357 unsigned short family, int dir,
358 u8 *dbits, u8 *sbits)
359{
360 switch (family) {
361 case AF_INET:
362 *dbits = net->xfrm.policy_bydst[dir].dbits4;
363 *sbits = net->xfrm.policy_bydst[dir].sbits4;
364 break;
365
366 case AF_INET6:
367 *dbits = net->xfrm.policy_bydst[dir].dbits6;
368 *sbits = net->xfrm.policy_bydst[dir].sbits6;
369 break;
370
371 default:
372 *dbits = 0;
373 *sbits = 0;
374 }
375}
376
David S. Miller5f803b52011-02-24 00:33:19 -0500377static struct hlist_head *policy_hash_bysel(struct net *net,
378 const struct xfrm_selector *sel,
379 unsigned short family, int dir)
David S. Miller2518c7c2006-08-24 04:45:07 -0700380{
Alexey Dobriyan11219942008-11-25 17:33:06 -0800381 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
Christophe Gouaultb58555f2014-08-29 16:16:04 +0200382 unsigned int hash;
383 u8 dbits;
384 u8 sbits;
385
386 __get_hash_thresh(net, family, dir, &dbits, &sbits);
387 hash = __sel_hash(sel, family, hmask, dbits, sbits);
David S. Miller2518c7c2006-08-24 04:45:07 -0700388
Florian Westphale1e551b2016-08-11 15:17:53 +0200389 if (hash == hmask + 1)
390 return &net->xfrm.policy_inexact[dir];
391
392 return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
393 lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
David S. Miller2518c7c2006-08-24 04:45:07 -0700394}
395
David S. Miller5f803b52011-02-24 00:33:19 -0500396static struct hlist_head *policy_hash_direct(struct net *net,
397 const xfrm_address_t *daddr,
398 const xfrm_address_t *saddr,
399 unsigned short family, int dir)
David S. Miller2518c7c2006-08-24 04:45:07 -0700400{
Alexey Dobriyan11219942008-11-25 17:33:06 -0800401 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
Christophe Gouaultb58555f2014-08-29 16:16:04 +0200402 unsigned int hash;
403 u8 dbits;
404 u8 sbits;
405
406 __get_hash_thresh(net, family, dir, &dbits, &sbits);
407 hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits);
David S. Miller2518c7c2006-08-24 04:45:07 -0700408
Florian Westphale1e551b2016-08-11 15:17:53 +0200409 return rcu_dereference_check(net->xfrm.policy_bydst[dir].table,
410 lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash;
David S. Miller2518c7c2006-08-24 04:45:07 -0700411}
412
Christophe Gouaultb58555f2014-08-29 16:16:04 +0200413static void xfrm_dst_hash_transfer(struct net *net,
414 struct hlist_head *list,
David S. Miller2518c7c2006-08-24 04:45:07 -0700415 struct hlist_head *ndsttable,
Christophe Gouaultb58555f2014-08-29 16:16:04 +0200416 unsigned int nhashmask,
417 int dir)
David S. Miller2518c7c2006-08-24 04:45:07 -0700418{
Sasha Levinb67bfe02013-02-27 17:06:00 -0800419 struct hlist_node *tmp, *entry0 = NULL;
David S. Miller2518c7c2006-08-24 04:45:07 -0700420 struct xfrm_policy *pol;
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800421 unsigned int h0 = 0;
Christophe Gouaultb58555f2014-08-29 16:16:04 +0200422 u8 dbits;
423 u8 sbits;
David S. Miller2518c7c2006-08-24 04:45:07 -0700424
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800425redo:
Sasha Levinb67bfe02013-02-27 17:06:00 -0800426 hlist_for_each_entry_safe(pol, tmp, list, bydst) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700427 unsigned int h;
428
Christophe Gouaultb58555f2014-08-29 16:16:04 +0200429 __get_hash_thresh(net, pol->family, dir, &dbits, &sbits);
David S. Miller2518c7c2006-08-24 04:45:07 -0700430 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
Christophe Gouaultb58555f2014-08-29 16:16:04 +0200431 pol->family, nhashmask, dbits, sbits);
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800432 if (!entry0) {
Florian Westphala5eefc12016-08-11 15:17:52 +0200433 hlist_del_rcu(&pol->bydst);
434 hlist_add_head_rcu(&pol->bydst, ndsttable + h);
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800435 h0 = h;
436 } else {
437 if (h != h0)
438 continue;
Florian Westphala5eefc12016-08-11 15:17:52 +0200439 hlist_del_rcu(&pol->bydst);
440 hlist_add_behind_rcu(&pol->bydst, entry0);
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800441 }
Sasha Levinb67bfe02013-02-27 17:06:00 -0800442 entry0 = &pol->bydst;
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800443 }
444 if (!hlist_empty(list)) {
445 entry0 = NULL;
446 goto redo;
David S. Miller2518c7c2006-08-24 04:45:07 -0700447 }
448}
449
450static void xfrm_idx_hash_transfer(struct hlist_head *list,
451 struct hlist_head *nidxtable,
452 unsigned int nhashmask)
453{
Sasha Levinb67bfe02013-02-27 17:06:00 -0800454 struct hlist_node *tmp;
David S. Miller2518c7c2006-08-24 04:45:07 -0700455 struct xfrm_policy *pol;
456
Sasha Levinb67bfe02013-02-27 17:06:00 -0800457 hlist_for_each_entry_safe(pol, tmp, list, byidx) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700458 unsigned int h;
459
460 h = __idx_hash(pol->index, nhashmask);
461 hlist_add_head(&pol->byidx, nidxtable+h);
462 }
463}
464
465static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
466{
467 return ((old_hmask + 1) << 1) - 1;
468}
469
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800470static void xfrm_bydst_resize(struct net *net, int dir)
David S. Miller2518c7c2006-08-24 04:45:07 -0700471{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800472 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700473 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
474 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
David S. Miller44e36b42006-08-24 04:50:50 -0700475 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
Florian Westphale1e551b2016-08-11 15:17:53 +0200476 struct hlist_head *odst;
David S. Miller2518c7c2006-08-24 04:45:07 -0700477 int i;
478
479 if (!ndst)
480 return;
481
Florian Westphal9d0380d2016-08-11 15:17:59 +0200482 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
Florian Westphal30846092016-08-11 15:17:54 +0200483 write_seqcount_begin(&xfrm_policy_hash_generation);
484
485 odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
486 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
David S. Miller2518c7c2006-08-24 04:45:07 -0700487
Florian Westphale1e551b2016-08-11 15:17:53 +0200488 odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table,
489 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
490
David S. Miller2518c7c2006-08-24 04:45:07 -0700491 for (i = hmask; i >= 0; i--)
Christophe Gouaultb58555f2014-08-29 16:16:04 +0200492 xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700493
Florian Westphale1e551b2016-08-11 15:17:53 +0200494 rcu_assign_pointer(net->xfrm.policy_bydst[dir].table, ndst);
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800495 net->xfrm.policy_bydst[dir].hmask = nhashmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700496
Florian Westphal30846092016-08-11 15:17:54 +0200497 write_seqcount_end(&xfrm_policy_hash_generation);
Florian Westphal9d0380d2016-08-11 15:17:59 +0200498 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
David S. Miller2518c7c2006-08-24 04:45:07 -0700499
Florian Westphale1e551b2016-08-11 15:17:53 +0200500 synchronize_rcu();
501
David S. Miller44e36b42006-08-24 04:50:50 -0700502 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
David S. Miller2518c7c2006-08-24 04:45:07 -0700503}
504
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800505static void xfrm_byidx_resize(struct net *net, int total)
David S. Miller2518c7c2006-08-24 04:45:07 -0700506{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800507 unsigned int hmask = net->xfrm.policy_idx_hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700508 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
509 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800510 struct hlist_head *oidx = net->xfrm.policy_byidx;
David S. Miller44e36b42006-08-24 04:50:50 -0700511 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
David S. Miller2518c7c2006-08-24 04:45:07 -0700512 int i;
513
514 if (!nidx)
515 return;
516
Florian Westphal9d0380d2016-08-11 15:17:59 +0200517 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
David S. Miller2518c7c2006-08-24 04:45:07 -0700518
519 for (i = hmask; i >= 0; i--)
520 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
521
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800522 net->xfrm.policy_byidx = nidx;
523 net->xfrm.policy_idx_hmask = nhashmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700524
Florian Westphal9d0380d2016-08-11 15:17:59 +0200525 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
David S. Miller2518c7c2006-08-24 04:45:07 -0700526
David S. Miller44e36b42006-08-24 04:50:50 -0700527 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
David S. Miller2518c7c2006-08-24 04:45:07 -0700528}
529
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800530static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
David S. Miller2518c7c2006-08-24 04:45:07 -0700531{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800532 unsigned int cnt = net->xfrm.policy_count[dir];
533 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700534
535 if (total)
536 *total += cnt;
537
538 if ((hmask + 1) < xfrm_policy_hashmax &&
539 cnt > hmask)
540 return 1;
541
542 return 0;
543}
544
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800545static inline int xfrm_byidx_should_resize(struct net *net, int total)
David S. Miller2518c7c2006-08-24 04:45:07 -0700546{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800547 unsigned int hmask = net->xfrm.policy_idx_hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700548
549 if ((hmask + 1) < xfrm_policy_hashmax &&
550 total > hmask)
551 return 1;
552
553 return 0;
554}
555
Alexey Dobriyane0710412010-01-23 13:37:10 +0000556void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
Jamal Hadi Salimecfd6b12007-04-28 21:20:32 -0700557{
Alexey Dobriyane0710412010-01-23 13:37:10 +0000558 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
559 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
560 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
561 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
562 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
563 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
564 si->spdhcnt = net->xfrm.policy_idx_hmask;
Jamal Hadi Salimecfd6b12007-04-28 21:20:32 -0700565 si->spdhmcnt = xfrm_policy_hashmax;
Jamal Hadi Salimecfd6b12007-04-28 21:20:32 -0700566}
567EXPORT_SYMBOL(xfrm_spd_getinfo);
David S. Miller2518c7c2006-08-24 04:45:07 -0700568
Jamal Hadi Salimecfd6b12007-04-28 21:20:32 -0700569static DEFINE_MUTEX(hash_resize_mutex);
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800570static void xfrm_hash_resize(struct work_struct *work)
David S. Miller2518c7c2006-08-24 04:45:07 -0700571{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800572 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
David S. Miller2518c7c2006-08-24 04:45:07 -0700573 int dir, total;
574
575 mutex_lock(&hash_resize_mutex);
576
577 total = 0;
Herbert Xu53c2e282014-11-13 17:09:49 +0800578 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800579 if (xfrm_bydst_should_resize(net, dir, &total))
580 xfrm_bydst_resize(net, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700581 }
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800582 if (xfrm_byidx_should_resize(net, total))
583 xfrm_byidx_resize(net, total);
David S. Miller2518c7c2006-08-24 04:45:07 -0700584
585 mutex_unlock(&hash_resize_mutex);
586}
587
Christophe Gouault880a6fa2014-08-29 16:16:05 +0200588static void xfrm_hash_rebuild(struct work_struct *work)
589{
590 struct net *net = container_of(work, struct net,
591 xfrm.policy_hthresh.work);
592 unsigned int hmask;
593 struct xfrm_policy *pol;
594 struct xfrm_policy *policy;
595 struct hlist_head *chain;
596 struct hlist_head *odst;
597 struct hlist_node *newpos;
598 int i;
599 int dir;
600 unsigned seq;
601 u8 lbits4, rbits4, lbits6, rbits6;
602
603 mutex_lock(&hash_resize_mutex);
604
605 /* read selector prefixlen thresholds */
606 do {
607 seq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
608
609 lbits4 = net->xfrm.policy_hthresh.lbits4;
610 rbits4 = net->xfrm.policy_hthresh.rbits4;
611 lbits6 = net->xfrm.policy_hthresh.lbits6;
612 rbits6 = net->xfrm.policy_hthresh.rbits6;
613 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq));
614
Florian Westphal9d0380d2016-08-11 15:17:59 +0200615 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
Christophe Gouault880a6fa2014-08-29 16:16:05 +0200616
617 /* reset the bydst and inexact table in all directions */
Herbert Xu53c2e282014-11-13 17:09:49 +0800618 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
Christophe Gouault880a6fa2014-08-29 16:16:05 +0200619 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
620 hmask = net->xfrm.policy_bydst[dir].hmask;
621 odst = net->xfrm.policy_bydst[dir].table;
622 for (i = hmask; i >= 0; i--)
623 INIT_HLIST_HEAD(odst + i);
624 if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) {
625 /* dir out => dst = remote, src = local */
626 net->xfrm.policy_bydst[dir].dbits4 = rbits4;
627 net->xfrm.policy_bydst[dir].sbits4 = lbits4;
628 net->xfrm.policy_bydst[dir].dbits6 = rbits6;
629 net->xfrm.policy_bydst[dir].sbits6 = lbits6;
630 } else {
631 /* dir in/fwd => dst = local, src = remote */
632 net->xfrm.policy_bydst[dir].dbits4 = lbits4;
633 net->xfrm.policy_bydst[dir].sbits4 = rbits4;
634 net->xfrm.policy_bydst[dir].dbits6 = lbits6;
635 net->xfrm.policy_bydst[dir].sbits6 = rbits6;
636 }
637 }
638
639 /* re-insert all policies by order of creation */
640 list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
Tobias Brunner6916fb32016-07-29 09:57:32 +0200641 if (xfrm_policy_id2dir(policy->index) >= XFRM_POLICY_MAX) {
642 /* skip socket policies */
643 continue;
644 }
Christophe Gouault880a6fa2014-08-29 16:16:05 +0200645 newpos = NULL;
646 chain = policy_hash_bysel(net, &policy->selector,
647 policy->family,
648 xfrm_policy_id2dir(policy->index));
649 hlist_for_each_entry(pol, chain, bydst) {
650 if (policy->priority >= pol->priority)
651 newpos = &pol->bydst;
652 else
653 break;
654 }
655 if (newpos)
656 hlist_add_behind(&policy->bydst, newpos);
657 else
658 hlist_add_head(&policy->bydst, chain);
659 }
660
Florian Westphal9d0380d2016-08-11 15:17:59 +0200661 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Christophe Gouault880a6fa2014-08-29 16:16:05 +0200662
663 mutex_unlock(&hash_resize_mutex);
664}
665
666void xfrm_policy_hash_rebuild(struct net *net)
667{
668 schedule_work(&net->xfrm.policy_hthresh.work);
669}
670EXPORT_SYMBOL(xfrm_policy_hash_rebuild);
671
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672/* Generate new index... KAME seems to generate them ordered by cost
673 * of an absolute inpredictability of ordering of rules. This will not pass. */
Fan Due682adf2013-11-07 17:47:48 +0800674static u32 xfrm_gen_index(struct net *net, int dir, u32 index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 static u32 idx_generator;
677
678 for (;;) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700679 struct hlist_head *list;
680 struct xfrm_policy *p;
681 u32 idx;
682 int found;
683
Fan Due682adf2013-11-07 17:47:48 +0800684 if (!index) {
685 idx = (idx_generator | dir);
686 idx_generator += 8;
687 } else {
688 idx = index;
689 index = 0;
690 }
691
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 if (idx == 0)
693 idx = 8;
Alexey Dobriyan11219942008-11-25 17:33:06 -0800694 list = net->xfrm.policy_byidx + idx_hash(net, idx);
David S. Miller2518c7c2006-08-24 04:45:07 -0700695 found = 0;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800696 hlist_for_each_entry(p, list, byidx) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700697 if (p->index == idx) {
698 found = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 break;
David S. Miller2518c7c2006-08-24 04:45:07 -0700700 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 }
David S. Miller2518c7c2006-08-24 04:45:07 -0700702 if (!found)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 return idx;
704 }
705}
706
David S. Miller2518c7c2006-08-24 04:45:07 -0700707static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
708{
709 u32 *p1 = (u32 *) s1;
710 u32 *p2 = (u32 *) s2;
711 int len = sizeof(struct xfrm_selector) / sizeof(u32);
712 int i;
713
714 for (i = 0; i < len; i++) {
715 if (p1[i] != p2[i])
716 return 1;
717 }
718
719 return 0;
720}
721
Steffen Klasserta0073fe2013-02-05 12:52:55 +0100722static void xfrm_policy_requeue(struct xfrm_policy *old,
723 struct xfrm_policy *new)
724{
725 struct xfrm_policy_queue *pq = &old->polq;
726 struct sk_buff_head list;
727
Li RongQingde2ad482015-04-30 17:25:19 +0800728 if (skb_queue_empty(&pq->hold_queue))
729 return;
730
Steffen Klasserta0073fe2013-02-05 12:52:55 +0100731 __skb_queue_head_init(&list);
732
733 spin_lock_bh(&pq->hold_queue.lock);
734 skb_queue_splice_init(&pq->hold_queue, &list);
Steffen Klasserte7d8f6c2013-10-08 10:49:45 +0200735 if (del_timer(&pq->hold_timer))
736 xfrm_pol_put(old);
Steffen Klasserta0073fe2013-02-05 12:52:55 +0100737 spin_unlock_bh(&pq->hold_queue.lock);
738
Steffen Klasserta0073fe2013-02-05 12:52:55 +0100739 pq = &new->polq;
740
741 spin_lock_bh(&pq->hold_queue.lock);
742 skb_queue_splice(&list, &pq->hold_queue);
743 pq->timeout = XFRM_QUEUE_TMO_MIN;
Steffen Klasserte7d8f6c2013-10-08 10:49:45 +0200744 if (!mod_timer(&pq->hold_timer, jiffies))
745 xfrm_pol_hold(new);
Steffen Klasserta0073fe2013-02-05 12:52:55 +0100746 spin_unlock_bh(&pq->hold_queue.lock);
747}
748
Steffen Klassert7cb8a932013-02-11 07:02:36 +0100749static bool xfrm_policy_mark_match(struct xfrm_policy *policy,
750 struct xfrm_policy *pol)
751{
752 u32 mark = policy->mark.v & policy->mark.m;
753
754 if (policy->mark.v == pol->mark.v && policy->mark.m == pol->mark.m)
755 return true;
756
757 if ((mark & pol->mark.m) == pol->mark.v &&
758 policy->priority == pol->priority)
759 return true;
760
761 return false;
762}
763
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
765{
Alexey Dobriyan11219942008-11-25 17:33:06 -0800766 struct net *net = xp_net(policy);
David S. Miller2518c7c2006-08-24 04:45:07 -0700767 struct xfrm_policy *pol;
768 struct xfrm_policy *delpol;
769 struct hlist_head *chain;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800770 struct hlist_node *newpos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
Florian Westphal9d0380d2016-08-11 15:17:59 +0200772 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800773 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700774 delpol = NULL;
775 newpos = NULL;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800776 hlist_for_each_entry(pol, chain, bydst) {
Herbert Xua6c7ab52007-01-16 16:52:02 -0800777 if (pol->type == policy->type &&
David S. Miller2518c7c2006-08-24 04:45:07 -0700778 !selector_cmp(&pol->selector, &policy->selector) &&
Steffen Klassert7cb8a932013-02-11 07:02:36 +0100779 xfrm_policy_mark_match(policy, pol) &&
Herbert Xua6c7ab52007-01-16 16:52:02 -0800780 xfrm_sec_ctx_match(pol->security, policy->security) &&
781 !WARN_ON(delpol)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 if (excl) {
Florian Westphal9d0380d2016-08-11 15:17:59 +0200783 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 return -EEXIST;
785 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 delpol = pol;
787 if (policy->priority > pol->priority)
788 continue;
789 } else if (policy->priority >= pol->priority) {
Herbert Xua6c7ab52007-01-16 16:52:02 -0800790 newpos = &pol->bydst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 continue;
792 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 if (delpol)
794 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 }
796 if (newpos)
Ken Helias1d023282014-08-06 16:09:16 -0700797 hlist_add_behind(&policy->bydst, newpos);
David S. Miller2518c7c2006-08-24 04:45:07 -0700798 else
799 hlist_add_head(&policy->bydst, chain);
Herbert Xu12bfa8b2014-11-13 17:09:50 +0800800 __xfrm_policy_link(policy, dir);
Fan Duca925cf2014-01-18 09:55:27 +0800801 atomic_inc(&net->xfrm.flow_cache_genid);
fan.duca4c3fc2013-07-30 08:33:53 +0800802
803 /* After previous checking, family can either be AF_INET or AF_INET6 */
804 if (policy->family == AF_INET)
805 rt_genid_bump_ipv4(net);
806 else
807 rt_genid_bump_ipv6(net);
808
Steffen Klasserta0073fe2013-02-05 12:52:55 +0100809 if (delpol) {
810 xfrm_policy_requeue(delpol, policy);
Wei Yongjun29fa0b302008-12-03 00:33:09 -0800811 __xfrm_policy_unlink(delpol, dir);
Steffen Klasserta0073fe2013-02-05 12:52:55 +0100812 }
Fan Due682adf2013-11-07 17:47:48 +0800813 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800814 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
James Morris9d729f72007-03-04 16:12:44 -0800815 policy->curlft.add_time = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 policy->curlft.use_time = 0;
817 if (!mod_timer(&policy->timer, jiffies + HZ))
818 xfrm_pol_hold(policy);
Florian Westphal9d0380d2016-08-11 15:17:59 +0200819 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
David S. Miller9b78a822005-12-22 07:39:48 -0800821 if (delpol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 xfrm_policy_kill(delpol);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800823 else if (xfrm_bydst_should_resize(net, dir, NULL))
824 schedule_work(&net->xfrm.policy_hash_work);
David S. Miller9b78a822005-12-22 07:39:48 -0800825
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 return 0;
827}
828EXPORT_SYMBOL(xfrm_policy_insert);
829
Jamal Hadi Salim8ca2e932010-02-22 11:32:57 +0000830struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
831 int dir, struct xfrm_selector *sel,
Eric Parisef41aaa2007-03-07 15:37:58 -0800832 struct xfrm_sec_ctx *ctx, int delete,
833 int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834{
David S. Miller2518c7c2006-08-24 04:45:07 -0700835 struct xfrm_policy *pol, *ret;
836 struct hlist_head *chain;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837
Eric Parisef41aaa2007-03-07 15:37:58 -0800838 *err = 0;
Florian Westphal9d0380d2016-08-11 15:17:59 +0200839 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
Alexey Dobriyan8d1211a2008-11-25 17:34:20 -0800840 chain = policy_hash_bysel(net, sel, sel->family, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700841 ret = NULL;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800842 hlist_for_each_entry(pol, chain, bydst) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700843 if (pol->type == type &&
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +0000844 (mark & pol->mark.m) == pol->mark.v &&
David S. Miller2518c7c2006-08-24 04:45:07 -0700845 !selector_cmp(sel, &pol->selector) &&
846 xfrm_sec_ctx_match(ctx, pol->security)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 xfrm_pol_hold(pol);
David S. Miller2518c7c2006-08-24 04:45:07 -0700848 if (delete) {
Paul Moore03e1ad72008-04-12 19:07:52 -0700849 *err = security_xfrm_policy_delete(
850 pol->security);
Eric Parisef41aaa2007-03-07 15:37:58 -0800851 if (*err) {
Florian Westphal9d0380d2016-08-11 15:17:59 +0200852 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Eric Parisef41aaa2007-03-07 15:37:58 -0800853 return pol;
854 }
Wei Yongjun29fa0b302008-12-03 00:33:09 -0800855 __xfrm_policy_unlink(pol, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700856 }
857 ret = pol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 break;
859 }
860 }
Florian Westphal9d0380d2016-08-11 15:17:59 +0200861 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000863 if (ret && delete)
David S. Miller2518c7c2006-08-24 04:45:07 -0700864 xfrm_policy_kill(ret);
David S. Miller2518c7c2006-08-24 04:45:07 -0700865 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866}
Trent Jaegerdf718372005-12-13 23:12:27 -0800867EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
Jamal Hadi Salim8ca2e932010-02-22 11:32:57 +0000869struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
870 int dir, u32 id, int delete, int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871{
David S. Miller2518c7c2006-08-24 04:45:07 -0700872 struct xfrm_policy *pol, *ret;
873 struct hlist_head *chain;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
Herbert Xub5505c62007-05-14 02:15:47 -0700875 *err = -ENOENT;
876 if (xfrm_policy_id2dir(id) != dir)
877 return NULL;
878
Eric Parisef41aaa2007-03-07 15:37:58 -0800879 *err = 0;
Florian Westphal9d0380d2016-08-11 15:17:59 +0200880 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
Alexey Dobriyan8d1211a2008-11-25 17:34:20 -0800881 chain = net->xfrm.policy_byidx + idx_hash(net, id);
David S. Miller2518c7c2006-08-24 04:45:07 -0700882 ret = NULL;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800883 hlist_for_each_entry(pol, chain, byidx) {
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +0000884 if (pol->type == type && pol->index == id &&
885 (mark & pol->mark.m) == pol->mark.v) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 xfrm_pol_hold(pol);
David S. Miller2518c7c2006-08-24 04:45:07 -0700887 if (delete) {
Paul Moore03e1ad72008-04-12 19:07:52 -0700888 *err = security_xfrm_policy_delete(
889 pol->security);
Eric Parisef41aaa2007-03-07 15:37:58 -0800890 if (*err) {
Florian Westphal9d0380d2016-08-11 15:17:59 +0200891 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Eric Parisef41aaa2007-03-07 15:37:58 -0800892 return pol;
893 }
Wei Yongjun29fa0b302008-12-03 00:33:09 -0800894 __xfrm_policy_unlink(pol, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700895 }
896 ret = pol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 break;
898 }
899 }
Florian Westphal9d0380d2016-08-11 15:17:59 +0200900 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000902 if (ret && delete)
David S. Miller2518c7c2006-08-24 04:45:07 -0700903 xfrm_policy_kill(ret);
David S. Miller2518c7c2006-08-24 04:45:07 -0700904 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
906EXPORT_SYMBOL(xfrm_policy_byid);
907
Joy Latten4aa2e622007-06-04 19:05:57 -0400908#ifdef CONFIG_SECURITY_NETWORK_XFRM
909static inline int
Tetsuo Handa2e710292014-04-22 21:48:30 +0900910xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911{
Joy Latten4aa2e622007-06-04 19:05:57 -0400912 int dir, err = 0;
913
914 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
915 struct xfrm_policy *pol;
Joy Latten4aa2e622007-06-04 19:05:57 -0400916 int i;
917
Sasha Levinb67bfe02013-02-27 17:06:00 -0800918 hlist_for_each_entry(pol,
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800919 &net->xfrm.policy_inexact[dir], bydst) {
Joy Latten4aa2e622007-06-04 19:05:57 -0400920 if (pol->type != type)
921 continue;
Paul Moore03e1ad72008-04-12 19:07:52 -0700922 err = security_xfrm_policy_delete(pol->security);
Joy Latten4aa2e622007-06-04 19:05:57 -0400923 if (err) {
Tetsuo Handa2e710292014-04-22 21:48:30 +0900924 xfrm_audit_policy_delete(pol, 0, task_valid);
Joy Latten4aa2e622007-06-04 19:05:57 -0400925 return err;
926 }
YOSHIFUJI Hideaki7dc12d62007-07-19 10:45:15 +0900927 }
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800928 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
Sasha Levinb67bfe02013-02-27 17:06:00 -0800929 hlist_for_each_entry(pol,
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800930 net->xfrm.policy_bydst[dir].table + i,
Joy Latten4aa2e622007-06-04 19:05:57 -0400931 bydst) {
932 if (pol->type != type)
933 continue;
Paul Moore03e1ad72008-04-12 19:07:52 -0700934 err = security_xfrm_policy_delete(
935 pol->security);
Joy Latten4aa2e622007-06-04 19:05:57 -0400936 if (err) {
Joy Lattenab5f5e82007-09-17 11:51:22 -0700937 xfrm_audit_policy_delete(pol, 0,
Tetsuo Handa2e710292014-04-22 21:48:30 +0900938 task_valid);
Joy Latten4aa2e622007-06-04 19:05:57 -0400939 return err;
940 }
941 }
942 }
943 }
944 return err;
945}
946#else
947static inline int
Tetsuo Handa2e710292014-04-22 21:48:30 +0900948xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid)
Joy Latten4aa2e622007-06-04 19:05:57 -0400949{
950 return 0;
951}
952#endif
953
Tetsuo Handa2e710292014-04-22 21:48:30 +0900954int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
Joy Latten4aa2e622007-06-04 19:05:57 -0400955{
Jamal Hadi Salim2f1eb652010-02-19 02:00:42 +0000956 int dir, err = 0, cnt = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957
Florian Westphal9d0380d2016-08-11 15:17:59 +0200958 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
Joy Latten4aa2e622007-06-04 19:05:57 -0400959
Tetsuo Handa2e710292014-04-22 21:48:30 +0900960 err = xfrm_policy_flush_secctx_check(net, type, task_valid);
Joy Latten4aa2e622007-06-04 19:05:57 -0400961 if (err)
962 goto out;
963
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700965 struct xfrm_policy *pol;
Wei Yongjun29fa0b302008-12-03 00:33:09 -0800966 int i;
David S. Miller2518c7c2006-08-24 04:45:07 -0700967
968 again1:
Sasha Levinb67bfe02013-02-27 17:06:00 -0800969 hlist_for_each_entry(pol,
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800970 &net->xfrm.policy_inexact[dir], bydst) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700971 if (pol->type != type)
972 continue;
Timo Teräsea2dea92010-03-31 00:17:05 +0000973 __xfrm_policy_unlink(pol, dir);
Florian Westphal9d0380d2016-08-11 15:17:59 +0200974 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Timo Teräsea2dea92010-03-31 00:17:05 +0000975 cnt++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976
Tetsuo Handa2e710292014-04-22 21:48:30 +0900977 xfrm_audit_policy_delete(pol, 1, task_valid);
Joy Latten161a09e2006-11-27 13:11:54 -0600978
David S. Miller2518c7c2006-08-24 04:45:07 -0700979 xfrm_policy_kill(pol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980
Steffen Klassert4141b362016-08-24 13:08:40 +0200981 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
David S. Miller2518c7c2006-08-24 04:45:07 -0700982 goto again1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 }
David S. Miller2518c7c2006-08-24 04:45:07 -0700984
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800985 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700986 again2:
Sasha Levinb67bfe02013-02-27 17:06:00 -0800987 hlist_for_each_entry(pol,
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800988 net->xfrm.policy_bydst[dir].table + i,
David S. Miller2518c7c2006-08-24 04:45:07 -0700989 bydst) {
990 if (pol->type != type)
991 continue;
Timo Teräsea2dea92010-03-31 00:17:05 +0000992 __xfrm_policy_unlink(pol, dir);
Florian Westphal9d0380d2016-08-11 15:17:59 +0200993 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Timo Teräsea2dea92010-03-31 00:17:05 +0000994 cnt++;
David S. Miller2518c7c2006-08-24 04:45:07 -0700995
Tetsuo Handa2e710292014-04-22 21:48:30 +0900996 xfrm_audit_policy_delete(pol, 1, task_valid);
David S. Miller2518c7c2006-08-24 04:45:07 -0700997 xfrm_policy_kill(pol);
998
Florian Westphal9d0380d2016-08-11 15:17:59 +0200999 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
David S. Miller2518c7c2006-08-24 04:45:07 -07001000 goto again2;
1001 }
1002 }
1003
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 }
Jamal Hadi Salim2f1eb652010-02-19 02:00:42 +00001005 if (!cnt)
1006 err = -ESRCH;
Joy Latten4aa2e622007-06-04 19:05:57 -04001007out:
Florian Westphal9d0380d2016-08-11 15:17:59 +02001008 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Xin Long35db0692017-04-24 15:33:39 +08001009
1010 if (cnt)
1011 xfrm_garbage_collect(net);
1012
Joy Latten4aa2e622007-06-04 19:05:57 -04001013 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014}
1015EXPORT_SYMBOL(xfrm_policy_flush);
1016
Alexey Dobriyancdcbca72008-11-25 17:34:49 -08001017int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
Timo Teras4c563f72008-02-28 21:31:08 -08001018 int (*func)(struct xfrm_policy *, int, int, void*),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 void *data)
1020{
Herbert Xu12a169e2008-10-01 07:03:24 -07001021 struct xfrm_policy *pol;
1022 struct xfrm_policy_walk_entry *x;
Timo Teras4c563f72008-02-28 21:31:08 -08001023 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
Timo Teras4c563f72008-02-28 21:31:08 -08001025 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
1026 walk->type != XFRM_POLICY_TYPE_ANY)
1027 return -EINVAL;
1028
Herbert Xu12a169e2008-10-01 07:03:24 -07001029 if (list_empty(&walk->walk.all) && walk->seq != 0)
Timo Teras4c563f72008-02-28 21:31:08 -08001030 return 0;
1031
Florian Westphal9d0380d2016-08-11 15:17:59 +02001032 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
Herbert Xu12a169e2008-10-01 07:03:24 -07001033 if (list_empty(&walk->walk.all))
Alexey Dobriyancdcbca72008-11-25 17:34:49 -08001034 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
Herbert Xu12a169e2008-10-01 07:03:24 -07001035 else
Li RongQing80077702015-04-22 17:09:54 +08001036 x = list_first_entry(&walk->walk.all,
1037 struct xfrm_policy_walk_entry, all);
1038
Alexey Dobriyancdcbca72008-11-25 17:34:49 -08001039 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
Herbert Xu12a169e2008-10-01 07:03:24 -07001040 if (x->dead)
Timo Teras4c563f72008-02-28 21:31:08 -08001041 continue;
Herbert Xu12a169e2008-10-01 07:03:24 -07001042 pol = container_of(x, struct xfrm_policy, walk);
1043 if (walk->type != XFRM_POLICY_TYPE_ANY &&
1044 walk->type != pol->type)
1045 continue;
1046 error = func(pol, xfrm_policy_id2dir(pol->index),
1047 walk->seq, data);
1048 if (error) {
1049 list_move_tail(&walk->walk.all, &x->all);
1050 goto out;
Timo Teras4c563f72008-02-28 21:31:08 -08001051 }
Herbert Xu12a169e2008-10-01 07:03:24 -07001052 walk->seq++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 }
Herbert Xu12a169e2008-10-01 07:03:24 -07001054 if (walk->seq == 0) {
Jamal Hadi Salimbaf5d742006-12-04 20:02:37 -08001055 error = -ENOENT;
1056 goto out;
1057 }
Herbert Xu12a169e2008-10-01 07:03:24 -07001058 list_del_init(&walk->walk.all);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059out:
Florian Westphal9d0380d2016-08-11 15:17:59 +02001060 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 return error;
1062}
1063EXPORT_SYMBOL(xfrm_policy_walk);
1064
Herbert Xu12a169e2008-10-01 07:03:24 -07001065void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1066{
1067 INIT_LIST_HEAD(&walk->walk.all);
1068 walk->walk.dead = 1;
1069 walk->type = type;
1070 walk->seq = 0;
1071}
1072EXPORT_SYMBOL(xfrm_policy_walk_init);
1073
Fan Du283bc9f2013-11-07 17:47:50 +08001074void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net)
Herbert Xu12a169e2008-10-01 07:03:24 -07001075{
1076 if (list_empty(&walk->walk.all))
1077 return;
1078
Florian Westphal9d0380d2016-08-11 15:17:59 +02001079 spin_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */
Herbert Xu12a169e2008-10-01 07:03:24 -07001080 list_del(&walk->walk.all);
Florian Westphal9d0380d2016-08-11 15:17:59 +02001081 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Herbert Xu12a169e2008-10-01 07:03:24 -07001082}
1083EXPORT_SYMBOL(xfrm_policy_walk_done);
1084
James Morris134b0fc2006-10-05 15:42:27 -05001085/*
1086 * Find policy to apply to this flow.
1087 *
1088 * Returns 0 if policy found, else an -errno.
1089 */
David S. Millerf299d552011-02-24 01:23:30 -05001090static int xfrm_policy_match(const struct xfrm_policy *pol,
1091 const struct flowi *fl,
David S. Miller2518c7c2006-08-24 04:45:07 -07001092 u8 type, u16 family, int dir)
1093{
David S. Millerf299d552011-02-24 01:23:30 -05001094 const struct xfrm_selector *sel = &pol->selector;
David S. Millerbc9b35a2012-05-15 15:04:57 -04001095 int ret = -ESRCH;
1096 bool match;
David S. Miller2518c7c2006-08-24 04:45:07 -07001097
1098 if (pol->family != family ||
David S. Miller1d28f422011-03-12 00:29:39 -05001099 (fl->flowi_mark & pol->mark.m) != pol->mark.v ||
David S. Miller2518c7c2006-08-24 04:45:07 -07001100 pol->type != type)
James Morris134b0fc2006-10-05 15:42:27 -05001101 return ret;
David S. Miller2518c7c2006-08-24 04:45:07 -07001102
1103 match = xfrm_selector_match(sel, fl, family);
James Morris134b0fc2006-10-05 15:42:27 -05001104 if (match)
David S. Miller1d28f422011-03-12 00:29:39 -05001105 ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
Paul Moore03e1ad72008-04-12 19:07:52 -07001106 dir);
David S. Miller2518c7c2006-08-24 04:45:07 -07001107
James Morris134b0fc2006-10-05 15:42:27 -05001108 return ret;
David S. Miller2518c7c2006-08-24 04:45:07 -07001109}
1110
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001111static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
David S. Miller062cdb42011-02-22 18:31:08 -08001112 const struct flowi *fl,
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001113 u16 family, u8 dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114{
James Morris134b0fc2006-10-05 15:42:27 -05001115 int err;
David S. Miller2518c7c2006-08-24 04:45:07 -07001116 struct xfrm_policy *pol, *ret;
David S. Miller0b597e72011-02-24 01:22:48 -05001117 const xfrm_address_t *daddr, *saddr;
David S. Miller2518c7c2006-08-24 04:45:07 -07001118 struct hlist_head *chain;
Florian Westphal30846092016-08-11 15:17:54 +02001119 unsigned int sequence;
1120 u32 priority;
David S. Miller2518c7c2006-08-24 04:45:07 -07001121
1122 daddr = xfrm_flowi_daddr(fl, family);
1123 saddr = xfrm_flowi_saddr(fl, family);
1124 if (unlikely(!daddr || !saddr))
1125 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
Florian Westphala7c442472016-08-11 15:17:56 +02001127 rcu_read_lock();
Florian Westphal30846092016-08-11 15:17:54 +02001128 retry:
1129 do {
1130 sequence = read_seqcount_begin(&xfrm_policy_hash_generation);
1131 chain = policy_hash_direct(net, daddr, saddr, family, dir);
1132 } while (read_seqcount_retry(&xfrm_policy_hash_generation, sequence));
1133
1134 priority = ~0U;
David S. Miller2518c7c2006-08-24 04:45:07 -07001135 ret = NULL;
Florian Westphala5eefc12016-08-11 15:17:52 +02001136 hlist_for_each_entry_rcu(pol, chain, bydst) {
James Morris134b0fc2006-10-05 15:42:27 -05001137 err = xfrm_policy_match(pol, fl, type, family, dir);
1138 if (err) {
1139 if (err == -ESRCH)
1140 continue;
1141 else {
1142 ret = ERR_PTR(err);
1143 goto fail;
1144 }
1145 } else {
David S. Milleracba48e2006-08-25 15:46:46 -07001146 ret = pol;
1147 priority = ret->priority;
1148 break;
1149 }
1150 }
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001151 chain = &net->xfrm.policy_inexact[dir];
Florian Westphala5eefc12016-08-11 15:17:52 +02001152 hlist_for_each_entry_rcu(pol, chain, bydst) {
Li RongQing8faf4912015-05-14 11:16:59 +08001153 if ((pol->priority >= priority) && ret)
1154 break;
1155
James Morris134b0fc2006-10-05 15:42:27 -05001156 err = xfrm_policy_match(pol, fl, type, family, dir);
1157 if (err) {
1158 if (err == -ESRCH)
1159 continue;
1160 else {
1161 ret = ERR_PTR(err);
1162 goto fail;
1163 }
Li RongQing8faf4912015-05-14 11:16:59 +08001164 } else {
David S. Miller2518c7c2006-08-24 04:45:07 -07001165 ret = pol;
1166 break;
1167 }
1168 }
Li RongQing586f2eb2015-04-30 17:13:41 +08001169
Florian Westphal30846092016-08-11 15:17:54 +02001170 if (read_seqcount_retry(&xfrm_policy_hash_generation, sequence))
1171 goto retry;
1172
Florian Westphale37cc8a2016-08-11 15:17:55 +02001173 if (ret && !xfrm_pol_hold_rcu(ret))
1174 goto retry;
James Morris134b0fc2006-10-05 15:42:27 -05001175fail:
Florian Westphala7c442472016-08-11 15:17:56 +02001176 rcu_read_unlock();
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001177
David S. Miller2518c7c2006-08-24 04:45:07 -07001178 return ret;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001179}
1180
Timo Teräs80c802f2010-04-07 00:30:05 +00001181static struct xfrm_policy *
David S. Miller73ff93c2011-02-22 18:33:42 -08001182__xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir)
Timo Teräs80c802f2010-04-07 00:30:05 +00001183{
1184#ifdef CONFIG_XFRM_SUB_POLICY
1185 struct xfrm_policy *pol;
1186
1187 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
1188 if (pol != NULL)
1189 return pol;
1190#endif
1191 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
1192}
1193
Baker Zhangb5fb82c2013-03-19 04:24:30 +00001194static int flow_to_policy_dir(int dir)
1195{
1196 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
1197 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1198 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1199 return dir;
1200
1201 switch (dir) {
1202 default:
1203 case FLOW_DIR_IN:
1204 return XFRM_POLICY_IN;
1205 case FLOW_DIR_OUT:
1206 return XFRM_POLICY_OUT;
1207 case FLOW_DIR_FWD:
1208 return XFRM_POLICY_FWD;
1209 }
1210}
1211
Timo Teräsfe1a5f02010-04-07 00:30:04 +00001212static struct flow_cache_object *
David S. Millerdee9f4b2011-02-22 18:44:31 -08001213xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family,
Timo Teräsfe1a5f02010-04-07 00:30:04 +00001214 u8 dir, struct flow_cache_object *old_obj, void *ctx)
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001215{
1216 struct xfrm_policy *pol;
Timo Teräsfe1a5f02010-04-07 00:30:04 +00001217
1218 if (old_obj)
1219 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001220
Baker Zhangb5fb82c2013-03-19 04:24:30 +00001221 pol = __xfrm_policy_lookup(net, fl, family, flow_to_policy_dir(dir));
Timo Teräs80c802f2010-04-07 00:30:05 +00001222 if (IS_ERR_OR_NULL(pol))
Timo Teräsfe1a5f02010-04-07 00:30:04 +00001223 return ERR_CAST(pol);
Timo Teräsfe1a5f02010-04-07 00:30:04 +00001224
Timo Teräsfe1a5f02010-04-07 00:30:04 +00001225 /* Resolver returns two references:
1226 * one for cache and one for caller of flow_cache_lookup() */
1227 xfrm_pol_hold(pol);
1228
1229 return &pol->flo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230}
1231
Trent Jaegerdf718372005-12-13 23:12:27 -08001232static inline int policy_to_flow_dir(int dir)
1233{
1234 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09001235 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1236 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1237 return dir;
1238 switch (dir) {
1239 default:
1240 case XFRM_POLICY_IN:
1241 return FLOW_DIR_IN;
1242 case XFRM_POLICY_OUT:
1243 return FLOW_DIR_OUT;
1244 case XFRM_POLICY_FWD:
1245 return FLOW_DIR_FWD;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001246 }
Trent Jaegerdf718372005-12-13 23:12:27 -08001247}
1248
Eric Dumazet6f9c9612015-09-25 07:39:10 -07001249static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
Steffen Klassert4c86d772017-02-14 07:43:56 +01001250 const struct flowi *fl, u16 family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251{
1252 struct xfrm_policy *pol;
1253
Eric Dumazetd188ba82015-12-08 07:22:02 -08001254 rcu_read_lock();
Florian Westphalae337862016-08-11 15:17:57 +02001255 again:
Eric Dumazetd188ba82015-12-08 07:22:02 -08001256 pol = rcu_dereference(sk->sk_policy[dir]);
1257 if (pol != NULL) {
Steffen Klassert4c86d772017-02-14 07:43:56 +01001258 bool match = xfrm_selector_match(&pol->selector, fl, family);
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09001259 int err = 0;
Trent Jaegerdf718372005-12-13 23:12:27 -08001260
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05001261 if (match) {
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +00001262 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1263 pol = NULL;
1264 goto out;
1265 }
Paul Moore03e1ad72008-04-12 19:07:52 -07001266 err = security_xfrm_policy_lookup(pol->security,
David S. Miller1d28f422011-03-12 00:29:39 -05001267 fl->flowi_secid,
Paul Moore03e1ad72008-04-12 19:07:52 -07001268 policy_to_flow_dir(dir));
Florian Westphal330e8322016-11-17 13:21:46 +01001269 if (!err) {
1270 if (!xfrm_pol_hold_rcu(pol))
1271 goto again;
1272 } else if (err == -ESRCH) {
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05001273 pol = NULL;
Florian Westphal330e8322016-11-17 13:21:46 +01001274 } else {
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05001275 pol = ERR_PTR(err);
Florian Westphal330e8322016-11-17 13:21:46 +01001276 }
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05001277 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 pol = NULL;
1279 }
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +00001280out:
Eric Dumazetd188ba82015-12-08 07:22:02 -08001281 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 return pol;
1283}
1284
1285static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1286{
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001287 struct net *net = xp_net(pol);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001288
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001289 list_add(&pol->walk.all, &net->xfrm.policy_all);
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001290 net->xfrm.policy_count[dir]++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 xfrm_pol_hold(pol);
1292}
1293
1294static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1295 int dir)
1296{
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001297 struct net *net = xp_net(pol);
1298
Herbert Xu53c2e282014-11-13 17:09:49 +08001299 if (list_empty(&pol->walk.all))
David S. Miller2518c7c2006-08-24 04:45:07 -07001300 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301
Herbert Xu53c2e282014-11-13 17:09:49 +08001302 /* Socket policies are not hashed. */
1303 if (!hlist_unhashed(&pol->bydst)) {
Florian Westphala5eefc12016-08-11 15:17:52 +02001304 hlist_del_rcu(&pol->bydst);
Herbert Xu53c2e282014-11-13 17:09:49 +08001305 hlist_del(&pol->byidx);
1306 }
1307
1308 list_del_init(&pol->walk.all);
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001309 net->xfrm.policy_count[dir]--;
David S. Miller2518c7c2006-08-24 04:45:07 -07001310
1311 return pol;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312}
1313
Herbert Xu53c2e282014-11-13 17:09:49 +08001314static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir)
1315{
1316 __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir);
1317}
1318
1319static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir)
1320{
1321 __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir);
1322}
1323
Herbert Xu4666faa2005-06-18 22:43:22 -07001324int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325{
Fan Du283bc9f2013-11-07 17:47:50 +08001326 struct net *net = xp_net(pol);
1327
Florian Westphal9d0380d2016-08-11 15:17:59 +02001328 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 pol = __xfrm_policy_unlink(pol, dir);
Florian Westphal9d0380d2016-08-11 15:17:59 +02001330 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 if (pol) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 xfrm_policy_kill(pol);
Herbert Xu4666faa2005-06-18 22:43:22 -07001333 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 }
Herbert Xu4666faa2005-06-18 22:43:22 -07001335 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336}
David S. Millera70fcb02006-03-20 19:18:52 -08001337EXPORT_SYMBOL(xfrm_policy_delete);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
1339int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1340{
Alexey Dobriyan11219942008-11-25 17:33:06 -08001341 struct net *net = xp_net(pol);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 struct xfrm_policy *old_pol;
1343
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001344#ifdef CONFIG_XFRM_SUB_POLICY
1345 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1346 return -EINVAL;
1347#endif
1348
Florian Westphal9d0380d2016-08-11 15:17:59 +02001349 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
Eric Dumazetd188ba82015-12-08 07:22:02 -08001350 old_pol = rcu_dereference_protected(sk->sk_policy[dir],
1351 lockdep_is_held(&net->xfrm.xfrm_policy_lock));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 if (pol) {
James Morris9d729f72007-03-04 16:12:44 -08001353 pol->curlft.add_time = get_seconds();
Fan Due682adf2013-11-07 17:47:48 +08001354 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
Herbert Xu53c2e282014-11-13 17:09:49 +08001355 xfrm_sk_policy_link(pol, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 }
Eric Dumazetd188ba82015-12-08 07:22:02 -08001357 rcu_assign_pointer(sk->sk_policy[dir], pol);
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001358 if (old_pol) {
1359 if (pol)
1360 xfrm_policy_requeue(old_pol, pol);
1361
Timo Teräsea2dea92010-03-31 00:17:05 +00001362 /* Unlinking succeeds always. This is the only function
1363 * allowed to delete or replace socket policy.
1364 */
Herbert Xu53c2e282014-11-13 17:09:49 +08001365 xfrm_sk_policy_unlink(old_pol, dir);
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001366 }
Florian Westphal9d0380d2016-08-11 15:17:59 +02001367 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368
1369 if (old_pol) {
1370 xfrm_policy_kill(old_pol);
1371 }
1372 return 0;
1373}
1374
David S. Millerd3e40a92011-02-24 01:25:41 -05001375static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376{
Alexey Dobriyan0331b1f2008-11-25 17:21:45 -08001377 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
Fan Du283bc9f2013-11-07 17:47:50 +08001378 struct net *net = xp_net(old);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379
1380 if (newp) {
1381 newp->selector = old->selector;
Paul Moore03e1ad72008-04-12 19:07:52 -07001382 if (security_xfrm_policy_clone(old->security,
1383 &newp->security)) {
Trent Jaegerdf718372005-12-13 23:12:27 -08001384 kfree(newp);
1385 return NULL; /* ENOMEM */
1386 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 newp->lft = old->lft;
1388 newp->curlft = old->curlft;
Jamal Hadi Salimfb977e22010-02-23 15:09:53 -08001389 newp->mark = old->mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 newp->action = old->action;
1391 newp->flags = old->flags;
1392 newp->xfrm_nr = old->xfrm_nr;
1393 newp->index = old->index;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001394 newp->type = old->type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 memcpy(newp->xfrm_vec, old->xfrm_vec,
1396 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
Florian Westphal9d0380d2016-08-11 15:17:59 +02001397 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
Herbert Xu53c2e282014-11-13 17:09:49 +08001398 xfrm_sk_policy_link(newp, dir);
Florian Westphal9d0380d2016-08-11 15:17:59 +02001399 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 xfrm_pol_put(newp);
1401 }
1402 return newp;
1403}
1404
Eric Dumazetd188ba82015-12-08 07:22:02 -08001405int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406{
Eric Dumazetd188ba82015-12-08 07:22:02 -08001407 const struct xfrm_policy *p;
1408 struct xfrm_policy *np;
1409 int i, ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410
Eric Dumazetd188ba82015-12-08 07:22:02 -08001411 rcu_read_lock();
1412 for (i = 0; i < 2; i++) {
1413 p = rcu_dereference(osk->sk_policy[i]);
1414 if (p) {
1415 np = clone_policy(p, i);
1416 if (unlikely(!np)) {
1417 ret = -ENOMEM;
1418 break;
1419 }
1420 rcu_assign_pointer(sk->sk_policy[i], np);
1421 }
1422 }
1423 rcu_read_unlock();
1424 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425}
1426
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001427static int
David Ahern42a7b322015-08-10 16:58:11 -06001428xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local,
1429 xfrm_address_t *remote, unsigned short family)
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001430{
1431 int err;
Florian Westphal37b10382017-02-07 15:00:19 +01001432 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001433
1434 if (unlikely(afinfo == NULL))
1435 return -EINVAL;
David Ahern42a7b322015-08-10 16:58:11 -06001436 err = afinfo->get_saddr(net, oif, local, remote);
Florian Westphalbdba9fe2017-02-07 15:00:18 +01001437 rcu_read_unlock();
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001438 return err;
1439}
1440
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441/* Resolve list of templates for the flow, given policy. */
1442
1443static int
David S. Millera6c2e612011-02-22 18:35:39 -08001444xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl,
1445 struct xfrm_state **xfrm, unsigned short family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446{
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -08001447 struct net *net = xp_net(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 int nx;
1449 int i, error;
1450 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1451 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001452 xfrm_address_t tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
Weilong Chen9b7a7872013-12-24 09:43:46 +08001454 for (nx = 0, i = 0; i < policy->xfrm_nr; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 struct xfrm_state *x;
1456 xfrm_address_t *remote = daddr;
1457 xfrm_address_t *local = saddr;
1458 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1459
Joakim Koskela48b8d782007-07-26 00:08:42 -07001460 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1461 tmpl->mode == XFRM_MODE_BEET) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 remote = &tmpl->id.daddr;
1463 local = &tmpl->saddr;
Thomas Egerer8444cf72010-09-20 11:11:38 -07001464 if (xfrm_addr_any(local, tmpl->encap_family)) {
David Ahern42a7b322015-08-10 16:58:11 -06001465 error = xfrm_get_saddr(net, fl->flowi_oif,
1466 &tmp, remote,
1467 tmpl->encap_family);
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001468 if (error)
1469 goto fail;
1470 local = &tmp;
1471 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 }
1473
1474 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1475
1476 if (x && x->km.state == XFRM_STATE_VALID) {
1477 xfrm[nx++] = x;
1478 daddr = remote;
1479 saddr = local;
1480 continue;
1481 }
1482 if (x) {
1483 error = (x->km.state == XFRM_STATE_ERROR ?
1484 -EINVAL : -EAGAIN);
1485 xfrm_state_put(x);
Weilong Chen420545692013-12-24 09:43:49 +08001486 } else if (error == -ESRCH) {
fernando@oss.ntt.coa43222662008-10-23 04:27:19 +00001487 error = -EAGAIN;
Weilong Chen420545692013-12-24 09:43:49 +08001488 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489
1490 if (!tmpl->optional)
1491 goto fail;
1492 }
1493 return nx;
1494
1495fail:
Weilong Chen9b7a7872013-12-24 09:43:46 +08001496 for (nx--; nx >= 0; nx--)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 xfrm_state_put(xfrm[nx]);
1498 return error;
1499}
1500
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001501static int
David S. Millera6c2e612011-02-22 18:35:39 -08001502xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl,
1503 struct xfrm_state **xfrm, unsigned short family)
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001504{
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001505 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1506 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001507 int cnx = 0;
1508 int error;
1509 int ret;
1510 int i;
1511
1512 for (i = 0; i < npols; i++) {
1513 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1514 error = -ENOBUFS;
1515 goto fail;
1516 }
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001517
1518 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001519 if (ret < 0) {
1520 error = ret;
1521 goto fail;
1522 } else
1523 cnx += ret;
1524 }
1525
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001526 /* found states are sorted for outbound processing */
1527 if (npols > 1)
1528 xfrm_state_sort(xfrm, tpp, cnx, family);
1529
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001530 return cnx;
1531
1532 fail:
Weilong Chen9b7a7872013-12-24 09:43:46 +08001533 for (cnx--; cnx >= 0; cnx--)
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001534 xfrm_state_put(tpp[cnx]);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001535 return error;
1536
1537}
1538
Florian Westphalf5e2bb42017-02-07 15:00:14 +01001539static int xfrm_get_tos(const struct flowi *fl, int family)
Herbert Xu25ee3282007-12-11 09:32:34 -08001540{
Florian Westphal37b10382017-02-07 15:00:19 +01001541 const struct xfrm_policy_afinfo *afinfo;
Florian Westphalf5e2bb42017-02-07 15:00:14 +01001542 int tos = 0;
Herbert Xu25ee3282007-12-11 09:32:34 -08001543
Florian Westphalf5e2bb42017-02-07 15:00:14 +01001544 afinfo = xfrm_policy_get_afinfo(family);
1545 tos = afinfo ? afinfo->get_tos(fl) : 0;
Herbert Xu25ee3282007-12-11 09:32:34 -08001546
Florian Westphalbdba9fe2017-02-07 15:00:18 +01001547 rcu_read_unlock();
Herbert Xu25ee3282007-12-11 09:32:34 -08001548
1549 return tos;
1550}
1551
Timo Teräs80c802f2010-04-07 00:30:05 +00001552static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1553{
1554 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1555 struct dst_entry *dst = &xdst->u.dst;
1556
1557 if (xdst->route == NULL) {
1558 /* Dummy bundle - if it has xfrms we were not
1559 * able to build bundle as template resolution failed.
1560 * It means we need to try again resolving. */
1561 if (xdst->num_xfrms > 0)
1562 return NULL;
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001563 } else if (dst->flags & DST_XFRM_QUEUE) {
1564 return NULL;
Timo Teräs80c802f2010-04-07 00:30:05 +00001565 } else {
1566 /* Real bundle */
1567 if (stale_bundle(dst))
1568 return NULL;
1569 }
1570
1571 dst_hold(dst);
1572 return flo;
1573}
1574
1575static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1576{
1577 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1578 struct dst_entry *dst = &xdst->u.dst;
1579
1580 if (!xdst->route)
1581 return 0;
1582 if (stale_bundle(dst))
1583 return 0;
1584
1585 return 1;
1586}
1587
1588static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1589{
1590 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1591 struct dst_entry *dst = &xdst->u.dst;
1592
1593 dst_free(dst);
1594}
1595
1596static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1597 .get = xfrm_bundle_flo_get,
1598 .check = xfrm_bundle_flo_check,
1599 .delete = xfrm_bundle_flo_delete,
1600};
1601
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001602static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
Herbert Xu25ee3282007-12-11 09:32:34 -08001603{
Florian Westphal37b10382017-02-07 15:00:19 +01001604 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001605 struct dst_ops *dst_ops;
Herbert Xu25ee3282007-12-11 09:32:34 -08001606 struct xfrm_dst *xdst;
1607
1608 if (!afinfo)
1609 return ERR_PTR(-EINVAL);
1610
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001611 switch (family) {
1612 case AF_INET:
1613 dst_ops = &net->xfrm.xfrm4_dst_ops;
1614 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001615#if IS_ENABLED(CONFIG_IPV6)
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001616 case AF_INET6:
1617 dst_ops = &net->xfrm.xfrm6_dst_ops;
1618 break;
1619#endif
1620 default:
1621 BUG();
1622 }
David S. Millerf5b0a872012-07-19 12:31:33 -07001623 xdst = dst_alloc(dst_ops, NULL, 0, DST_OBSOLETE_NONE, 0);
Herbert Xu25ee3282007-12-11 09:32:34 -08001624
Madalin Bucurd4cae562011-09-26 07:04:36 +00001625 if (likely(xdst)) {
Steffen Klassert141e3692012-07-05 23:39:34 +00001626 struct dst_entry *dst = &xdst->u.dst;
1627
1628 memset(dst + 1, 0, sizeof(*xdst) - sizeof(*dst));
Hiroaki SHIMODA0b150932011-02-10 23:08:33 -08001629 xdst->flo.ops = &xfrm_bundle_fc_ops;
Madalin Bucurd4cae562011-09-26 07:04:36 +00001630 } else
Hiroaki SHIMODA0b150932011-02-10 23:08:33 -08001631 xdst = ERR_PTR(-ENOBUFS);
Timo Teräs80c802f2010-04-07 00:30:05 +00001632
Florian Westphalbdba9fe2017-02-07 15:00:18 +01001633 rcu_read_unlock();
Madalin Bucurd4cae562011-09-26 07:04:36 +00001634
Herbert Xu25ee3282007-12-11 09:32:34 -08001635 return xdst;
1636}
1637
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001638static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1639 int nfheader_len)
1640{
Florian Westphal37b10382017-02-07 15:00:19 +01001641 const struct xfrm_policy_afinfo *afinfo =
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001642 xfrm_policy_get_afinfo(dst->ops->family);
1643 int err;
1644
1645 if (!afinfo)
1646 return -EINVAL;
1647
1648 err = afinfo->init_path(path, dst, nfheader_len);
1649
Florian Westphalbdba9fe2017-02-07 15:00:18 +01001650 rcu_read_unlock();
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001651
1652 return err;
1653}
1654
Herbert Xu87c1e122010-03-02 02:51:56 +00001655static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
David S. Miller0c7b3ee2011-02-22 17:48:57 -08001656 const struct flowi *fl)
Herbert Xu25ee3282007-12-11 09:32:34 -08001657{
Florian Westphal37b10382017-02-07 15:00:19 +01001658 const struct xfrm_policy_afinfo *afinfo =
Herbert Xu25ee3282007-12-11 09:32:34 -08001659 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1660 int err;
1661
1662 if (!afinfo)
1663 return -EINVAL;
1664
Herbert Xu87c1e122010-03-02 02:51:56 +00001665 err = afinfo->fill_dst(xdst, dev, fl);
Herbert Xu25ee3282007-12-11 09:32:34 -08001666
Florian Westphalbdba9fe2017-02-07 15:00:18 +01001667 rcu_read_unlock();
Herbert Xu25ee3282007-12-11 09:32:34 -08001668
1669 return err;
1670}
1671
Timo Teräs80c802f2010-04-07 00:30:05 +00001672
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673/* Allocate chain of dst_entry's, attach known xfrm's, calculate
1674 * all the metrics... Shortly, bundle a bundle.
1675 */
1676
Herbert Xu25ee3282007-12-11 09:32:34 -08001677static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1678 struct xfrm_state **xfrm, int nx,
David S. Miller98313ad2011-02-22 18:36:50 -08001679 const struct flowi *fl,
Herbert Xu25ee3282007-12-11 09:32:34 -08001680 struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681{
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001682 struct net *net = xp_net(policy);
Herbert Xu25ee3282007-12-11 09:32:34 -08001683 unsigned long now = jiffies;
1684 struct net_device *dev;
Steffen Klassert43a4dea2011-05-09 19:36:38 +00001685 struct xfrm_mode *inner_mode;
Herbert Xu25ee3282007-12-11 09:32:34 -08001686 struct dst_entry *dst_prev = NULL;
1687 struct dst_entry *dst0 = NULL;
1688 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689 int err;
Herbert Xu25ee3282007-12-11 09:32:34 -08001690 int header_len = 0;
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001691 int nfheader_len = 0;
Herbert Xu25ee3282007-12-11 09:32:34 -08001692 int trailer_len = 0;
1693 int tos;
1694 int family = policy->selector.family;
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +09001695 xfrm_address_t saddr, daddr;
1696
1697 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
Herbert Xu25ee3282007-12-11 09:32:34 -08001698
1699 tos = xfrm_get_tos(fl, family);
Herbert Xu25ee3282007-12-11 09:32:34 -08001700
1701 dst_hold(dst);
1702
1703 for (; i < nx; i++) {
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001704 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
Herbert Xu25ee3282007-12-11 09:32:34 -08001705 struct dst_entry *dst1 = &xdst->u.dst;
1706
1707 err = PTR_ERR(xdst);
1708 if (IS_ERR(xdst)) {
1709 dst_release(dst);
1710 goto put_states;
1711 }
1712
Steffen Klassert43a4dea2011-05-09 19:36:38 +00001713 if (xfrm[i]->sel.family == AF_UNSPEC) {
1714 inner_mode = xfrm_ip2inner_mode(xfrm[i],
1715 xfrm_af2proto(family));
1716 if (!inner_mode) {
1717 err = -EAFNOSUPPORT;
1718 dst_release(dst);
1719 goto put_states;
1720 }
1721 } else
1722 inner_mode = xfrm[i]->inner_mode;
1723
Herbert Xu25ee3282007-12-11 09:32:34 -08001724 if (!dst_prev)
1725 dst0 = dst1;
1726 else {
1727 dst_prev->child = dst_clone(dst1);
1728 dst1->flags |= DST_NOHASH;
1729 }
1730
1731 xdst->route = dst;
David S. Millerdefb3512010-12-08 21:16:57 -08001732 dst_copy_metrics(dst1, dst);
Herbert Xu25ee3282007-12-11 09:32:34 -08001733
1734 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1735 family = xfrm[i]->props.family;
David Ahern42a7b322015-08-10 16:58:11 -06001736 dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif,
1737 &saddr, &daddr, family);
Herbert Xu25ee3282007-12-11 09:32:34 -08001738 err = PTR_ERR(dst);
1739 if (IS_ERR(dst))
1740 goto put_states;
1741 } else
1742 dst_hold(dst);
1743
1744 dst1->xfrm = xfrm[i];
Timo Teräs80c802f2010-04-07 00:30:05 +00001745 xdst->xfrm_genid = xfrm[i]->genid;
Herbert Xu25ee3282007-12-11 09:32:34 -08001746
David S. Millerf5b0a872012-07-19 12:31:33 -07001747 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
Herbert Xu25ee3282007-12-11 09:32:34 -08001748 dst1->flags |= DST_HOST;
1749 dst1->lastuse = now;
1750
1751 dst1->input = dst_discard;
Steffen Klassert43a4dea2011-05-09 19:36:38 +00001752 dst1->output = inner_mode->afinfo->output;
Herbert Xu25ee3282007-12-11 09:32:34 -08001753
1754 dst1->next = dst_prev;
1755 dst_prev = dst1;
1756
1757 header_len += xfrm[i]->props.header_len;
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001758 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1759 nfheader_len += xfrm[i]->props.header_len;
Herbert Xu25ee3282007-12-11 09:32:34 -08001760 trailer_len += xfrm[i]->props.trailer_len;
1761 }
1762
1763 dst_prev->child = dst;
1764 dst0->path = dst;
1765
1766 err = -ENODEV;
1767 dev = dst->dev;
1768 if (!dev)
1769 goto free_dst;
1770
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001771 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
Herbert Xu25ee3282007-12-11 09:32:34 -08001772 xfrm_init_pmtu(dst_prev);
1773
1774 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1775 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1776
Herbert Xu87c1e122010-03-02 02:51:56 +00001777 err = xfrm_fill_dst(xdst, dev, fl);
Herbert Xu25ee3282007-12-11 09:32:34 -08001778 if (err)
1779 goto free_dst;
1780
1781 dst_prev->header_len = header_len;
1782 dst_prev->trailer_len = trailer_len;
1783 header_len -= xdst->u.dst.xfrm->props.header_len;
1784 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1785 }
1786
1787out:
1788 return dst0;
1789
1790put_states:
1791 for (; i < nx; i++)
1792 xfrm_state_put(xfrm[i]);
1793free_dst:
1794 if (dst0)
1795 dst_free(dst0);
1796 dst0 = ERR_PTR(err);
1797 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798}
1799
David S. Miller73ff93c2011-02-22 18:33:42 -08001800static int xfrm_expand_policies(const struct flowi *fl, u16 family,
Timo Teräs80c802f2010-04-07 00:30:05 +00001801 struct xfrm_policy **pols,
1802 int *num_pols, int *num_xfrms)
1803{
1804 int i;
1805
1806 if (*num_pols == 0 || !pols[0]) {
1807 *num_pols = 0;
1808 *num_xfrms = 0;
1809 return 0;
1810 }
1811 if (IS_ERR(pols[0]))
1812 return PTR_ERR(pols[0]);
1813
1814 *num_xfrms = pols[0]->xfrm_nr;
1815
1816#ifdef CONFIG_XFRM_SUB_POLICY
1817 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1818 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1819 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1820 XFRM_POLICY_TYPE_MAIN,
1821 fl, family,
1822 XFRM_POLICY_OUT);
1823 if (pols[1]) {
1824 if (IS_ERR(pols[1])) {
1825 xfrm_pols_put(pols, *num_pols);
1826 return PTR_ERR(pols[1]);
1827 }
Weilong Chen02d08922013-12-24 09:43:48 +08001828 (*num_pols)++;
Timo Teräs80c802f2010-04-07 00:30:05 +00001829 (*num_xfrms) += pols[1]->xfrm_nr;
1830 }
1831 }
1832#endif
1833 for (i = 0; i < *num_pols; i++) {
1834 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1835 *num_xfrms = -1;
1836 break;
1837 }
1838 }
1839
1840 return 0;
1841
1842}
1843
1844static struct xfrm_dst *
1845xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
David S. Miller4ca2e682011-02-22 18:38:51 -08001846 const struct flowi *fl, u16 family,
Timo Teräs80c802f2010-04-07 00:30:05 +00001847 struct dst_entry *dst_orig)
1848{
1849 struct net *net = xp_net(pols[0]);
1850 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1851 struct dst_entry *dst;
1852 struct xfrm_dst *xdst;
1853 int err;
1854
1855 /* Try to instantiate a bundle */
1856 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
Timo Teräsd809ec82010-07-12 21:29:42 +00001857 if (err <= 0) {
1858 if (err != 0 && err != -EAGAIN)
Timo Teräs80c802f2010-04-07 00:30:05 +00001859 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1860 return ERR_PTR(err);
1861 }
1862
1863 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1864 if (IS_ERR(dst)) {
1865 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1866 return ERR_CAST(dst);
1867 }
1868
1869 xdst = (struct xfrm_dst *)dst;
1870 xdst->num_xfrms = err;
Timo Teräs80c802f2010-04-07 00:30:05 +00001871 xdst->num_pols = num_pols;
Weilong Chen3e94c2d2013-12-24 09:43:47 +08001872 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
Timo Teräs80c802f2010-04-07 00:30:05 +00001873 xdst->policy_genid = atomic_read(&pols[0]->genid);
1874
1875 return xdst;
1876}
1877
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001878static void xfrm_policy_queue_process(unsigned long arg)
1879{
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001880 struct sk_buff *skb;
1881 struct sock *sk;
1882 struct dst_entry *dst;
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001883 struct xfrm_policy *pol = (struct xfrm_policy *)arg;
Eric W. Biederman3f5312a2015-10-07 16:48:34 -05001884 struct net *net = xp_net(pol);
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001885 struct xfrm_policy_queue *pq = &pol->polq;
1886 struct flowi fl;
1887 struct sk_buff_head list;
1888
1889 spin_lock(&pq->hold_queue.lock);
1890 skb = skb_peek(&pq->hold_queue);
Steffen Klassert2bb53e22013-10-08 10:49:51 +02001891 if (!skb) {
1892 spin_unlock(&pq->hold_queue.lock);
1893 goto out;
1894 }
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001895 dst = skb_dst(skb);
1896 sk = skb->sk;
1897 xfrm_decode_session(skb, &fl, dst->ops->family);
1898 spin_unlock(&pq->hold_queue.lock);
1899
1900 dst_hold(dst->path);
Eric W. Biederman3f5312a2015-10-07 16:48:34 -05001901 dst = xfrm_lookup(net, dst->path, &fl, sk, 0);
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001902 if (IS_ERR(dst))
1903 goto purge_queue;
1904
1905 if (dst->flags & DST_XFRM_QUEUE) {
1906 dst_release(dst);
1907
1908 if (pq->timeout >= XFRM_QUEUE_TMO_MAX)
1909 goto purge_queue;
1910
1911 pq->timeout = pq->timeout << 1;
Steffen Klasserte7d8f6c2013-10-08 10:49:45 +02001912 if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout))
1913 xfrm_pol_hold(pol);
1914 goto out;
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001915 }
1916
1917 dst_release(dst);
1918
1919 __skb_queue_head_init(&list);
1920
1921 spin_lock(&pq->hold_queue.lock);
1922 pq->timeout = 0;
1923 skb_queue_splice_init(&pq->hold_queue, &list);
1924 spin_unlock(&pq->hold_queue.lock);
1925
1926 while (!skb_queue_empty(&list)) {
1927 skb = __skb_dequeue(&list);
1928
1929 xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
1930 dst_hold(skb_dst(skb)->path);
Eric W. Biederman3f5312a2015-10-07 16:48:34 -05001931 dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0);
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001932 if (IS_ERR(dst)) {
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001933 kfree_skb(skb);
1934 continue;
1935 }
1936
1937 nf_reset(skb);
1938 skb_dst_drop(skb);
1939 skb_dst_set(skb, dst);
1940
Eric W. Biederman13206b62015-10-07 16:48:35 -05001941 dst_output(net, skb->sk, skb);
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001942 }
1943
Steffen Klasserte7d8f6c2013-10-08 10:49:45 +02001944out:
1945 xfrm_pol_put(pol);
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001946 return;
1947
1948purge_queue:
1949 pq->timeout = 0;
Li RongQing1ee5e662015-04-22 15:51:16 +08001950 skb_queue_purge(&pq->hold_queue);
Steffen Klasserte7d8f6c2013-10-08 10:49:45 +02001951 xfrm_pol_put(pol);
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001952}
1953
Eric W. Biedermanede20592015-10-07 16:48:47 -05001954static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001955{
1956 unsigned long sched_next;
1957 struct dst_entry *dst = skb_dst(skb);
1958 struct xfrm_dst *xdst = (struct xfrm_dst *) dst;
Steffen Klasserte7d8f6c2013-10-08 10:49:45 +02001959 struct xfrm_policy *pol = xdst->pols[0];
1960 struct xfrm_policy_queue *pq = &pol->polq;
Steffen Klassert4d53eff2013-10-16 13:42:46 +02001961
Eric Dumazet39bb5e62014-10-30 10:32:34 -07001962 if (unlikely(skb_fclone_busy(sk, skb))) {
Steffen Klassert4d53eff2013-10-16 13:42:46 +02001963 kfree_skb(skb);
1964 return 0;
1965 }
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001966
1967 if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) {
1968 kfree_skb(skb);
1969 return -EAGAIN;
1970 }
1971
1972 skb_dst_force(skb);
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001973
1974 spin_lock_bh(&pq->hold_queue.lock);
1975
1976 if (!pq->timeout)
1977 pq->timeout = XFRM_QUEUE_TMO_MIN;
1978
1979 sched_next = jiffies + pq->timeout;
1980
1981 if (del_timer(&pq->hold_timer)) {
1982 if (time_before(pq->hold_timer.expires, sched_next))
1983 sched_next = pq->hold_timer.expires;
Steffen Klasserte7d8f6c2013-10-08 10:49:45 +02001984 xfrm_pol_put(pol);
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001985 }
1986
1987 __skb_queue_tail(&pq->hold_queue, skb);
Steffen Klasserte7d8f6c2013-10-08 10:49:45 +02001988 if (!mod_timer(&pq->hold_timer, sched_next))
1989 xfrm_pol_hold(pol);
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001990
1991 spin_unlock_bh(&pq->hold_queue.lock);
1992
1993 return 0;
1994}
1995
1996static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
Steffen Klassertb8c203b2014-09-16 10:08:49 +02001997 struct xfrm_flo *xflo,
Steffen Klasserta0073fe2013-02-05 12:52:55 +01001998 const struct flowi *fl,
1999 int num_xfrms,
2000 u16 family)
2001{
2002 int err;
2003 struct net_device *dev;
Steffen Klassertb8c203b2014-09-16 10:08:49 +02002004 struct dst_entry *dst;
Steffen Klasserta0073fe2013-02-05 12:52:55 +01002005 struct dst_entry *dst1;
2006 struct xfrm_dst *xdst;
2007
2008 xdst = xfrm_alloc_dst(net, family);
2009 if (IS_ERR(xdst))
2010 return xdst;
2011
Steffen Klassertb8c203b2014-09-16 10:08:49 +02002012 if (!(xflo->flags & XFRM_LOOKUP_QUEUE) ||
2013 net->xfrm.sysctl_larval_drop ||
2014 num_xfrms <= 0)
Steffen Klasserta0073fe2013-02-05 12:52:55 +01002015 return xdst;
2016
Steffen Klassertb8c203b2014-09-16 10:08:49 +02002017 dst = xflo->dst_orig;
Steffen Klasserta0073fe2013-02-05 12:52:55 +01002018 dst1 = &xdst->u.dst;
2019 dst_hold(dst);
2020 xdst->route = dst;
2021
2022 dst_copy_metrics(dst1, dst);
2023
2024 dst1->obsolete = DST_OBSOLETE_FORCE_CHK;
2025 dst1->flags |= DST_HOST | DST_XFRM_QUEUE;
2026 dst1->lastuse = jiffies;
2027
2028 dst1->input = dst_discard;
2029 dst1->output = xdst_queue_output;
2030
2031 dst_hold(dst);
2032 dst1->child = dst;
2033 dst1->path = dst;
2034
2035 xfrm_init_path((struct xfrm_dst *)dst1, dst, 0);
2036
2037 err = -ENODEV;
2038 dev = dst->dev;
2039 if (!dev)
2040 goto free_dst;
2041
2042 err = xfrm_fill_dst(xdst, dev, fl);
2043 if (err)
2044 goto free_dst;
2045
2046out:
2047 return xdst;
2048
2049free_dst:
2050 dst_release(dst1);
2051 xdst = ERR_PTR(err);
2052 goto out;
2053}
2054
Timo Teräs80c802f2010-04-07 00:30:05 +00002055static struct flow_cache_object *
David S. Millerdee9f4b2011-02-22 18:44:31 -08002056xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir,
Timo Teräs80c802f2010-04-07 00:30:05 +00002057 struct flow_cache_object *oldflo, void *ctx)
2058{
Steffen Klassertb8c203b2014-09-16 10:08:49 +02002059 struct xfrm_flo *xflo = (struct xfrm_flo *)ctx;
Timo Teräs80c802f2010-04-07 00:30:05 +00002060 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2061 struct xfrm_dst *xdst, *new_xdst;
2062 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
2063
2064 /* Check if the policies from old bundle are usable */
2065 xdst = NULL;
2066 if (oldflo) {
2067 xdst = container_of(oldflo, struct xfrm_dst, flo);
2068 num_pols = xdst->num_pols;
2069 num_xfrms = xdst->num_xfrms;
2070 pol_dead = 0;
2071 for (i = 0; i < num_pols; i++) {
2072 pols[i] = xdst->pols[i];
2073 pol_dead |= pols[i]->walk.dead;
2074 }
2075 if (pol_dead) {
2076 dst_free(&xdst->u.dst);
2077 xdst = NULL;
2078 num_pols = 0;
2079 num_xfrms = 0;
2080 oldflo = NULL;
2081 }
2082 }
2083
2084 /* Resolve policies to use if we couldn't get them from
2085 * previous cache entry */
2086 if (xdst == NULL) {
2087 num_pols = 1;
Baker Zhangb5fb82c2013-03-19 04:24:30 +00002088 pols[0] = __xfrm_policy_lookup(net, fl, family,
2089 flow_to_policy_dir(dir));
Timo Teräs80c802f2010-04-07 00:30:05 +00002090 err = xfrm_expand_policies(fl, family, pols,
2091 &num_pols, &num_xfrms);
2092 if (err < 0)
2093 goto inc_error;
2094 if (num_pols == 0)
2095 return NULL;
2096 if (num_xfrms <= 0)
2097 goto make_dummy_bundle;
2098 }
2099
Steffen Klassertb8c203b2014-09-16 10:08:49 +02002100 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
2101 xflo->dst_orig);
Timo Teräs80c802f2010-04-07 00:30:05 +00002102 if (IS_ERR(new_xdst)) {
2103 err = PTR_ERR(new_xdst);
2104 if (err != -EAGAIN)
2105 goto error;
2106 if (oldflo == NULL)
2107 goto make_dummy_bundle;
2108 dst_hold(&xdst->u.dst);
2109 return oldflo;
Timo Teräsd809ec82010-07-12 21:29:42 +00002110 } else if (new_xdst == NULL) {
2111 num_xfrms = 0;
2112 if (oldflo == NULL)
2113 goto make_dummy_bundle;
2114 xdst->num_xfrms = 0;
2115 dst_hold(&xdst->u.dst);
2116 return oldflo;
Timo Teräs80c802f2010-04-07 00:30:05 +00002117 }
2118
2119 /* Kill the previous bundle */
2120 if (xdst) {
2121 /* The policies were stolen for newly generated bundle */
2122 xdst->num_pols = 0;
2123 dst_free(&xdst->u.dst);
2124 }
2125
2126 /* Flow cache does not have reference, it dst_free()'s,
2127 * but we do need to return one reference for original caller */
2128 dst_hold(&new_xdst->u.dst);
2129 return &new_xdst->flo;
2130
2131make_dummy_bundle:
2132 /* We found policies, but there's no bundles to instantiate:
2133 * either because the policy blocks, has no transformations or
2134 * we could not build template (no xfrm_states).*/
Steffen Klassertb8c203b2014-09-16 10:08:49 +02002135 xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family);
Timo Teräs80c802f2010-04-07 00:30:05 +00002136 if (IS_ERR(xdst)) {
2137 xfrm_pols_put(pols, num_pols);
2138 return ERR_CAST(xdst);
2139 }
2140 xdst->num_pols = num_pols;
2141 xdst->num_xfrms = num_xfrms;
Weilong Chen3e94c2d2013-12-24 09:43:47 +08002142 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
Timo Teräs80c802f2010-04-07 00:30:05 +00002143
2144 dst_hold(&xdst->u.dst);
2145 return &xdst->flo;
2146
2147inc_error:
2148 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
2149error:
2150 if (xdst != NULL)
2151 dst_free(&xdst->u.dst);
2152 else
2153 xfrm_pols_put(pols, num_pols);
2154 return ERR_PTR(err);
2155}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002156
David S. Miller2774c132011-03-01 14:59:04 -08002157static struct dst_entry *make_blackhole(struct net *net, u16 family,
2158 struct dst_entry *dst_orig)
2159{
Florian Westphal37b10382017-02-07 15:00:19 +01002160 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
David S. Miller2774c132011-03-01 14:59:04 -08002161 struct dst_entry *ret;
2162
2163 if (!afinfo) {
2164 dst_release(dst_orig);
Li RongQing433a1952012-09-17 22:40:10 +00002165 return ERR_PTR(-EINVAL);
David S. Miller2774c132011-03-01 14:59:04 -08002166 } else {
2167 ret = afinfo->blackhole_route(net, dst_orig);
2168 }
Florian Westphalbdba9fe2017-02-07 15:00:18 +01002169 rcu_read_unlock();
David S. Miller2774c132011-03-01 14:59:04 -08002170
2171 return ret;
2172}
2173
Linus Torvalds1da177e2005-04-16 15:20:36 -07002174/* Main function: finds/creates a bundle for given flow.
2175 *
2176 * At the moment we eat a raw IP route. Mostly to speed up lookups
2177 * on interfaces with disabled IPsec.
2178 */
David S. Miller452edd52011-03-02 13:27:41 -08002179struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
2180 const struct flowi *fl,
Eric Dumazet6f9c9612015-09-25 07:39:10 -07002181 const struct sock *sk, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002182{
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002183 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
Timo Teräs80c802f2010-04-07 00:30:05 +00002184 struct flow_cache_object *flo;
2185 struct xfrm_dst *xdst;
David S. Miller452edd52011-03-02 13:27:41 -08002186 struct dst_entry *dst, *route;
Timo Teräs80c802f2010-04-07 00:30:05 +00002187 u16 family = dst_orig->ops->family;
Trent Jaegerdf718372005-12-13 23:12:27 -08002188 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
Changli Gao4b021622010-04-27 21:20:22 +00002189 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07002190
Timo Teräs80c802f2010-04-07 00:30:05 +00002191 dst = NULL;
2192 xdst = NULL;
2193 route = NULL;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002194
Eric Dumazetbd5eb352015-12-07 08:53:17 -08002195 sk = sk_const_to_full_sk(sk);
Thomas Graff7944fb2007-08-25 13:46:55 -07002196 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
Timo Teräs80c802f2010-04-07 00:30:05 +00002197 num_pols = 1;
Steffen Klassert4c86d772017-02-14 07:43:56 +01002198 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family);
Timo Teräs80c802f2010-04-07 00:30:05 +00002199 err = xfrm_expand_policies(fl, family, pols,
2200 &num_pols, &num_xfrms);
2201 if (err < 0)
Herbert Xu75b8c132007-12-11 04:38:08 -08002202 goto dropdst;
Timo Teräs80c802f2010-04-07 00:30:05 +00002203
2204 if (num_pols) {
2205 if (num_xfrms <= 0) {
2206 drop_pols = num_pols;
2207 goto no_transform;
2208 }
2209
2210 xdst = xfrm_resolve_and_create_bundle(
2211 pols, num_pols, fl,
2212 family, dst_orig);
2213 if (IS_ERR(xdst)) {
2214 xfrm_pols_put(pols, num_pols);
2215 err = PTR_ERR(xdst);
2216 goto dropdst;
Timo Teräsd809ec82010-07-12 21:29:42 +00002217 } else if (xdst == NULL) {
2218 num_xfrms = 0;
2219 drop_pols = num_pols;
2220 goto no_transform;
Timo Teräs80c802f2010-04-07 00:30:05 +00002221 }
2222
Steffen Klassertb7eea452014-06-18 12:34:21 +02002223 dst_hold(&xdst->u.dst);
2224 xdst->u.dst.flags |= DST_NOCACHE;
Timo Teräs80c802f2010-04-07 00:30:05 +00002225 route = xdst->route;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002226 }
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05002227 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228
Timo Teräs80c802f2010-04-07 00:30:05 +00002229 if (xdst == NULL) {
Steffen Klassertb8c203b2014-09-16 10:08:49 +02002230 struct xfrm_flo xflo;
2231
2232 xflo.dst_orig = dst_orig;
2233 xflo.flags = flags;
2234
Linus Torvalds1da177e2005-04-16 15:20:36 -07002235 /* To accelerate a bit... */
David S. Miller2518c7c2006-08-24 04:45:07 -07002236 if ((dst_orig->flags & DST_NOXFRM) ||
Alexey Dobriyan52479b62008-11-25 17:35:18 -08002237 !net->xfrm.policy_count[XFRM_POLICY_OUT])
Herbert Xu8b7817f2007-12-12 10:44:43 -08002238 goto nopol;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002239
Timo Teräs80c802f2010-04-07 00:30:05 +00002240 flo = flow_cache_lookup(net, fl, family, dir,
Steffen Klassertb8c203b2014-09-16 10:08:49 +02002241 xfrm_bundle_lookup, &xflo);
Timo Teräs80c802f2010-04-07 00:30:05 +00002242 if (flo == NULL)
2243 goto nopol;
Timo Teräsfe1a5f02010-04-07 00:30:04 +00002244 if (IS_ERR(flo)) {
Timo Teräs80c802f2010-04-07 00:30:05 +00002245 err = PTR_ERR(flo);
Herbert Xu75b8c132007-12-11 04:38:08 -08002246 goto dropdst;
Masahide NAKAMURAd66e37a2008-01-07 21:46:15 -08002247 }
Timo Teräs80c802f2010-04-07 00:30:05 +00002248 xdst = container_of(flo, struct xfrm_dst, flo);
2249
2250 num_pols = xdst->num_pols;
2251 num_xfrms = xdst->num_xfrms;
Weilong Chen3e94c2d2013-12-24 09:43:47 +08002252 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols);
Timo Teräs80c802f2010-04-07 00:30:05 +00002253 route = xdst->route;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002254 }
2255
Timo Teräs80c802f2010-04-07 00:30:05 +00002256 dst = &xdst->u.dst;
2257 if (route == NULL && num_xfrms > 0) {
2258 /* The only case when xfrm_bundle_lookup() returns a
2259 * bundle with null route, is when the template could
2260 * not be resolved. It means policies are there, but
2261 * bundle could not be created, since we don't yet
2262 * have the xfrm_state's. We need to wait for KM to
2263 * negotiate new SA's or bail out with error.*/
2264 if (net->xfrm.sysctl_larval_drop) {
Timo Teräs80c802f2010-04-07 00:30:05 +00002265 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
huaibin Wangac37e252015-02-11 18:10:36 +01002266 err = -EREMOTE;
2267 goto error;
Timo Teräs80c802f2010-04-07 00:30:05 +00002268 }
Timo Teräs80c802f2010-04-07 00:30:05 +00002269
Steffen Klassert5b8ef342013-08-27 13:43:30 +02002270 err = -EAGAIN;
Timo Teräs80c802f2010-04-07 00:30:05 +00002271
2272 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
2273 goto error;
2274 }
2275
2276no_transform:
2277 if (num_pols == 0)
Herbert Xu8b7817f2007-12-12 10:44:43 -08002278 goto nopol;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002279
Timo Teräs80c802f2010-04-07 00:30:05 +00002280 if ((flags & XFRM_LOOKUP_ICMP) &&
2281 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
2282 err = -ENOENT;
Herbert Xu8b7817f2007-12-12 10:44:43 -08002283 goto error;
Timo Teräs80c802f2010-04-07 00:30:05 +00002284 }
Herbert Xu8b7817f2007-12-12 10:44:43 -08002285
Timo Teräs80c802f2010-04-07 00:30:05 +00002286 for (i = 0; i < num_pols; i++)
2287 pols[i]->curlft.use_time = get_seconds();
Herbert Xu8b7817f2007-12-12 10:44:43 -08002288
Timo Teräs80c802f2010-04-07 00:30:05 +00002289 if (num_xfrms < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290 /* Prohibit the flow */
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002291 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
Patrick McHardye104411b2005-09-08 15:11:55 -07002292 err = -EPERM;
2293 goto error;
Timo Teräs80c802f2010-04-07 00:30:05 +00002294 } else if (num_xfrms > 0) {
2295 /* Flow transformed */
Timo Teräs80c802f2010-04-07 00:30:05 +00002296 dst_release(dst_orig);
2297 } else {
2298 /* Flow passes untransformed */
2299 dst_release(dst);
David S. Miller452edd52011-03-02 13:27:41 -08002300 dst = dst_orig;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002301 }
Timo Teräs80c802f2010-04-07 00:30:05 +00002302ok:
2303 xfrm_pols_put(pols, drop_pols);
Gao feng0c183372012-05-26 01:30:53 +00002304 if (dst && dst->xfrm &&
2305 dst->xfrm->props.mode == XFRM_MODE_TUNNEL)
2306 dst->flags |= DST_XFRM_TUNNEL;
David S. Miller452edd52011-03-02 13:27:41 -08002307 return dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002308
Timo Teräs80c802f2010-04-07 00:30:05 +00002309nopol:
David S. Miller452edd52011-03-02 13:27:41 -08002310 if (!(flags & XFRM_LOOKUP_ICMP)) {
2311 dst = dst_orig;
Timo Teräs80c802f2010-04-07 00:30:05 +00002312 goto ok;
David S. Miller452edd52011-03-02 13:27:41 -08002313 }
Timo Teräs80c802f2010-04-07 00:30:05 +00002314 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315error:
Timo Teräs80c802f2010-04-07 00:30:05 +00002316 dst_release(dst);
Herbert Xu75b8c132007-12-11 04:38:08 -08002317dropdst:
huaibin Wangac37e252015-02-11 18:10:36 +01002318 if (!(flags & XFRM_LOOKUP_KEEP_DST_REF))
2319 dst_release(dst_orig);
Timo Teräs80c802f2010-04-07 00:30:05 +00002320 xfrm_pols_put(pols, drop_pols);
David S. Miller452edd52011-03-02 13:27:41 -08002321 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322}
2323EXPORT_SYMBOL(xfrm_lookup);
2324
Steffen Klassertf92ee612014-09-16 10:08:40 +02002325/* Callers of xfrm_lookup_route() must ensure a call to dst_output().
2326 * Otherwise we may send out blackholed packets.
2327 */
2328struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
2329 const struct flowi *fl,
Eric Dumazet6f9c9612015-09-25 07:39:10 -07002330 const struct sock *sk, int flags)
Steffen Klassertf92ee612014-09-16 10:08:40 +02002331{
Steffen Klassertb8c203b2014-09-16 10:08:49 +02002332 struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk,
huaibin Wangac37e252015-02-11 18:10:36 +01002333 flags | XFRM_LOOKUP_QUEUE |
2334 XFRM_LOOKUP_KEEP_DST_REF);
Steffen Klassertf92ee612014-09-16 10:08:40 +02002335
2336 if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
2337 return make_blackhole(net, dst_orig->ops->family, dst_orig);
2338
2339 return dst;
2340}
2341EXPORT_SYMBOL(xfrm_lookup_route);
2342
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002343static inline int
David S. Miller8f029de2011-02-22 17:59:59 -08002344xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl)
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002345{
2346 struct xfrm_state *x;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002347
2348 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
2349 return 0;
2350 x = skb->sp->xvec[idx];
2351 if (!x->type->reject)
2352 return 0;
Herbert Xu1ecafed2007-10-09 13:24:07 -07002353 return x->type->reject(x, skb, fl);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002354}
2355
Linus Torvalds1da177e2005-04-16 15:20:36 -07002356/* When skb is transformed back to its "native" form, we have to
2357 * check policy restrictions. At the moment we make this in maximally
2358 * stupid way. Shame on me. :-) Of course, connected sockets must
2359 * have policy cached at them.
2360 */
2361
2362static inline int
David S. Miller7db454b2011-02-24 01:43:01 -05002363xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002364 unsigned short family)
2365{
2366 if (xfrm_state_kern(x))
Kazunori MIYAZAWA928ba412007-02-13 12:57:16 -08002367 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002368 return x->id.proto == tmpl->id.proto &&
2369 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
2370 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
2371 x->props.mode == tmpl->mode &&
Herbert Xuc5d18e92008-04-22 00:46:42 -07002372 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
Masahide NAKAMURAf3bd4842006-08-23 18:00:48 -07002373 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -07002374 !(x->props.mode != XFRM_MODE_TRANSPORT &&
2375 xfrm_state_addr_cmp(tmpl, x, family));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002376}
2377
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002378/*
2379 * 0 or more than 0 is returned when validation is succeeded (either bypass
2380 * because of optional transport mode, or next index of the mathced secpath
2381 * state with the template.
2382 * -1 is returned when no matching template is found.
2383 * Otherwise "-2 - errored_index" is returned.
2384 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385static inline int
David S. Miller22cccb72011-02-24 01:43:33 -05002386xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002387 unsigned short family)
2388{
2389 int idx = start;
2390
2391 if (tmpl->optional) {
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -07002392 if (tmpl->mode == XFRM_MODE_TRANSPORT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002393 return start;
2394 } else
2395 start = -1;
2396 for (; idx < sp->len; idx++) {
Herbert Xudbe5b4a2006-04-01 00:54:16 -08002397 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002398 return ++idx;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002399 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
2400 if (start == -1)
2401 start = -2-idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002402 break;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002403 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002404 }
2405 return start;
2406}
2407
Herbert Xud5422ef2007-12-12 10:44:16 -08002408int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
2409 unsigned int family, int reverse)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002410{
Florian Westphal37b10382017-02-07 15:00:19 +01002411 const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07002412 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413
2414 if (unlikely(afinfo == NULL))
2415 return -EAFNOSUPPORT;
2416
Herbert Xud5422ef2007-12-12 10:44:16 -08002417 afinfo->decode_session(skb, fl, reverse);
David S. Miller1d28f422011-03-12 00:29:39 -05002418 err = security_xfrm_decode_session(skb, &fl->flowi_secid);
Florian Westphalbdba9fe2017-02-07 15:00:18 +01002419 rcu_read_unlock();
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07002420 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002421}
Herbert Xud5422ef2007-12-12 10:44:16 -08002422EXPORT_SYMBOL(__xfrm_decode_session);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002423
David S. Miller9a7386e2011-02-24 01:44:12 -05002424static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002425{
2426 for (; k < sp->len; k++) {
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002427 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
James Morrisd1d9fac2006-09-01 00:32:12 -07002428 *idxp = k;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002429 return 1;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002430 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431 }
2432
2433 return 0;
2434}
2435
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09002436int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002437 unsigned short family)
2438{
Alexey Dobriyanf6e1e252008-11-25 17:35:44 -08002439 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002440 struct xfrm_policy *pol;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002441 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2442 int npols = 0;
2443 int xfrm_nr;
2444 int pi;
Herbert Xud5422ef2007-12-12 10:44:16 -08002445 int reverse;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002446 struct flowi fl;
Herbert Xud5422ef2007-12-12 10:44:16 -08002447 u8 fl_dir;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002448 int xerr_idx = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449
Herbert Xud5422ef2007-12-12 10:44:16 -08002450 reverse = dir & ~XFRM_POLICY_MASK;
2451 dir &= XFRM_POLICY_MASK;
2452 fl_dir = policy_to_flow_dir(dir);
2453
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002454 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002455 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002456 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002457 }
2458
Patrick McHardyeb9c7eb2006-01-06 23:06:30 -08002459 nf_nat_decode_session(skb, &fl, family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002460
2461 /* First, check used SA against their selectors. */
2462 if (skb->sp) {
2463 int i;
2464
Weilong Chen9b7a7872013-12-24 09:43:46 +08002465 for (i = skb->sp->len-1; i >= 0; i--) {
Herbert Xudbe5b4a2006-04-01 00:54:16 -08002466 struct xfrm_state *x = skb->sp->xvec[i];
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002467 if (!xfrm_selector_match(&x->sel, &fl, family)) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002468 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002469 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002470 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002471 }
2472 }
2473
2474 pol = NULL;
Eric Dumazetbd5eb352015-12-07 08:53:17 -08002475 sk = sk_to_full_sk(sk);
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05002476 if (sk && sk->sk_policy[dir]) {
Steffen Klassert4c86d772017-02-14 07:43:56 +01002477 pol = xfrm_sk_policy_lookup(sk, dir, &fl, family);
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002478 if (IS_ERR(pol)) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002479 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05002480 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002481 }
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05002482 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002483
Timo Teräsfe1a5f02010-04-07 00:30:04 +00002484 if (!pol) {
2485 struct flow_cache_object *flo;
2486
2487 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2488 xfrm_policy_lookup, NULL);
2489 if (IS_ERR_OR_NULL(flo))
2490 pol = ERR_CAST(flo);
2491 else
2492 pol = container_of(flo, struct xfrm_policy, flo);
2493 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002494
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002495 if (IS_ERR(pol)) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002496 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
James Morris134b0fc2006-10-05 15:42:27 -05002497 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002498 }
James Morris134b0fc2006-10-05 15:42:27 -05002499
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002500 if (!pol) {
James Morrisd1d9fac2006-09-01 00:32:12 -07002501 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002502 xfrm_secpath_reject(xerr_idx, skb, &fl);
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002503 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002504 return 0;
2505 }
2506 return 1;
2507 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002508
James Morris9d729f72007-03-04 16:12:44 -08002509 pol->curlft.use_time = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002510
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002511 pols[0] = pol;
Weilong Chen02d08922013-12-24 09:43:48 +08002512 npols++;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002513#ifdef CONFIG_XFRM_SUB_POLICY
2514 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
Alexey Dobriyanf6e1e252008-11-25 17:35:44 -08002515 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002516 &fl, family,
2517 XFRM_POLICY_IN);
2518 if (pols[1]) {
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002519 if (IS_ERR(pols[1])) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002520 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
James Morris134b0fc2006-10-05 15:42:27 -05002521 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002522 }
James Morris9d729f72007-03-04 16:12:44 -08002523 pols[1]->curlft.use_time = get_seconds();
Weilong Chen02d08922013-12-24 09:43:48 +08002524 npols++;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002525 }
2526 }
2527#endif
2528
Linus Torvalds1da177e2005-04-16 15:20:36 -07002529 if (pol->action == XFRM_POLICY_ALLOW) {
2530 struct sec_path *sp;
2531 static struct sec_path dummy;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002532 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07002533 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002534 struct xfrm_tmpl **tpp = tp;
2535 int ti = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002536 int i, k;
2537
2538 if ((sp = skb->sp) == NULL)
2539 sp = &dummy;
2540
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002541 for (pi = 0; pi < npols; pi++) {
2542 if (pols[pi] != pol &&
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002543 pols[pi]->action != XFRM_POLICY_ALLOW) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002544 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002545 goto reject;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002546 }
2547 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002548 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002549 goto reject_error;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002550 }
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002551 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2552 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2553 }
2554 xfrm_nr = ti;
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07002555 if (npols > 1) {
Fan Du283bc9f2013-11-07 17:47:50 +08002556 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family, net);
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07002557 tpp = stp;
2558 }
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002559
Linus Torvalds1da177e2005-04-16 15:20:36 -07002560 /* For each tunnel xfrm, find the first matching tmpl.
2561 * For each tmpl before that, find corresponding xfrm.
2562 * Order is _important_. Later we will implement
2563 * some barriers, but at the moment barriers
2564 * are implied between each two transformations.
2565 */
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002566 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2567 k = xfrm_policy_ok(tpp[i], sp, k, family);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002568 if (k < 0) {
James Morrisd1d9fac2006-09-01 00:32:12 -07002569 if (k < -1)
2570 /* "-2 - errored_index" returned */
2571 xerr_idx = -(2+k);
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002572 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573 goto reject;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002574 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002575 }
2576
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002577 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002578 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002579 goto reject;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002580 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002581
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002582 xfrm_pols_put(pols, npols);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002583 return 1;
2584 }
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002585 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002586
2587reject:
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002588 xfrm_secpath_reject(xerr_idx, skb, &fl);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002589reject_error:
2590 xfrm_pols_put(pols, npols);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002591 return 0;
2592}
2593EXPORT_SYMBOL(__xfrm_policy_check);
2594
2595int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2596{
Alexey Dobriyan99a66652008-11-25 17:36:13 -08002597 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002598 struct flowi fl;
Eric Dumazetadf30902009-06-02 05:19:30 +00002599 struct dst_entry *dst;
Eric Dumazet73137142011-03-15 15:26:43 -07002600 int res = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002601
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002602 if (xfrm_decode_session(skb, &fl, family) < 0) {
jamal72032fd2010-02-18 03:35:07 +00002603 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002604 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002605 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002606
Eric Dumazetfafeeb62010-06-01 10:04:49 +00002607 skb_dst_force(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +00002608
Steffen Klassertb8c203b2014-09-16 10:08:49 +02002609 dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE);
David S. Miller452edd52011-03-02 13:27:41 -08002610 if (IS_ERR(dst)) {
Eric Dumazet73137142011-03-15 15:26:43 -07002611 res = 0;
David S. Miller452edd52011-03-02 13:27:41 -08002612 dst = NULL;
2613 }
Eric Dumazetadf30902009-06-02 05:19:30 +00002614 skb_dst_set(skb, dst);
2615 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002616}
2617EXPORT_SYMBOL(__xfrm_route_forward);
2618
David S. Millerd49c73c2006-08-13 18:55:53 -07002619/* Optimize later using cookies and generation ids. */
2620
Linus Torvalds1da177e2005-04-16 15:20:36 -07002621static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2622{
David S. Millerd49c73c2006-08-13 18:55:53 -07002623 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
David S. Millerf5b0a872012-07-19 12:31:33 -07002624 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2625 * get validated by dst_ops->check on every use. We do this
2626 * because when a normal route referenced by an XFRM dst is
2627 * obsoleted we do not go looking around for all parent
2628 * referencing XFRM dsts so that we can invalidate them. It
2629 * is just too much work. Instead we make the checks here on
2630 * every use. For example:
David S. Millerd49c73c2006-08-13 18:55:53 -07002631 *
2632 * XFRM dst A --> IPv4 dst X
2633 *
2634 * X is the "xdst->route" of A (X is also the "dst->path" of A
2635 * in this example). If X is marked obsolete, "A" will not
2636 * notice. That's what we are validating here via the
2637 * stale_bundle() check.
2638 *
2639 * When a policy's bundle is pruned, we dst_free() the XFRM
David S. Millerf5b0a872012-07-19 12:31:33 -07002640 * dst which causes it's ->obsolete field to be set to
2641 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2642 * this, we want to force a new route lookup.
David S. Miller399c1802005-12-19 14:23:23 -08002643 */
David S. Millerd49c73c2006-08-13 18:55:53 -07002644 if (dst->obsolete < 0 && !stale_bundle(dst))
2645 return dst;
2646
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647 return NULL;
2648}
2649
2650static int stale_bundle(struct dst_entry *dst)
2651{
Steffen Klassert12fdb4d2011-06-29 23:18:20 +00002652 return !xfrm_bundle_ok((struct xfrm_dst *)dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002653}
2654
Herbert Xuaabc9762005-05-03 16:27:10 -07002655void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002656{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002657 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002658 dst->dev = dev_net(dev)->loopback_dev;
Daniel Lezcanode3cb742007-09-25 19:16:28 -07002659 dev_hold(dst->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660 dev_put(dev);
2661 }
2662}
Herbert Xuaabc9762005-05-03 16:27:10 -07002663EXPORT_SYMBOL(xfrm_dst_ifdown);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002664
2665static void xfrm_link_failure(struct sk_buff *skb)
2666{
2667 /* Impossible. Such dst must be popped before reaches point of failure. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668}
2669
2670static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2671{
2672 if (dst) {
2673 if (dst->obsolete) {
2674 dst_release(dst);
2675 dst = NULL;
2676 }
2677 }
2678 return dst;
2679}
2680
Paul Mooree4c17212013-05-29 07:36:25 +00002681void xfrm_garbage_collect(struct net *net)
Steffen Klassertc0ed1c12011-12-21 16:48:08 -05002682{
Fan Duca925cf2014-01-18 09:55:27 +08002683 flow_cache_flush(net);
Steffen Klassertc0ed1c12011-12-21 16:48:08 -05002684}
Paul Mooree4c17212013-05-29 07:36:25 +00002685EXPORT_SYMBOL(xfrm_garbage_collect);
Steffen Klassertc0ed1c12011-12-21 16:48:08 -05002686
Florian Westphal3d7d25a2017-02-07 15:00:16 +01002687void xfrm_garbage_collect_deferred(struct net *net)
Steffen Klassertc0ed1c12011-12-21 16:48:08 -05002688{
Fan Duca925cf2014-01-18 09:55:27 +08002689 flow_cache_flush_deferred(net);
Steffen Klassertc0ed1c12011-12-21 16:48:08 -05002690}
Florian Westphal3d7d25a2017-02-07 15:00:16 +01002691EXPORT_SYMBOL(xfrm_garbage_collect_deferred);
Steffen Klassertc0ed1c12011-12-21 16:48:08 -05002692
Herbert Xu25ee3282007-12-11 09:32:34 -08002693static void xfrm_init_pmtu(struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002694{
2695 do {
2696 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2697 u32 pmtu, route_mtu_cached;
2698
2699 pmtu = dst_mtu(dst->child);
2700 xdst->child_mtu_cached = pmtu;
2701
2702 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2703
2704 route_mtu_cached = dst_mtu(xdst->route);
2705 xdst->route_mtu_cached = route_mtu_cached;
2706
2707 if (pmtu > route_mtu_cached)
2708 pmtu = route_mtu_cached;
2709
David S. Millerdefb3512010-12-08 21:16:57 -08002710 dst_metric_set(dst, RTAX_MTU, pmtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002711 } while ((dst = dst->next));
2712}
2713
Linus Torvalds1da177e2005-04-16 15:20:36 -07002714/* Check that the bundle accepts the flow and its components are
2715 * still valid.
2716 */
2717
Steffen Klassert12fdb4d2011-06-29 23:18:20 +00002718static int xfrm_bundle_ok(struct xfrm_dst *first)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002719{
2720 struct dst_entry *dst = &first->u.dst;
2721 struct xfrm_dst *last;
2722 u32 mtu;
2723
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -07002724 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07002725 (dst->dev && !netif_running(dst->dev)))
2726 return 0;
2727
Steffen Klasserta0073fe2013-02-05 12:52:55 +01002728 if (dst->flags & DST_XFRM_QUEUE)
2729 return 1;
2730
Linus Torvalds1da177e2005-04-16 15:20:36 -07002731 last = NULL;
2732
2733 do {
2734 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2735
Linus Torvalds1da177e2005-04-16 15:20:36 -07002736 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2737 return 0;
Timo Teräs80c802f2010-04-07 00:30:05 +00002738 if (xdst->xfrm_genid != dst->xfrm->genid)
2739 return 0;
Timo Teräsb1312c82010-06-24 14:35:00 -07002740 if (xdst->num_pols > 0 &&
2741 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
David S. Miller9d4a7062006-08-24 03:18:09 -07002742 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002743
2744 mtu = dst_mtu(dst->child);
2745 if (xdst->child_mtu_cached != mtu) {
2746 last = xdst;
2747 xdst->child_mtu_cached = mtu;
2748 }
2749
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -07002750 if (!dst_check(xdst->route, xdst->route_cookie))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002751 return 0;
2752 mtu = dst_mtu(xdst->route);
2753 if (xdst->route_mtu_cached != mtu) {
2754 last = xdst;
2755 xdst->route_mtu_cached = mtu;
2756 }
2757
2758 dst = dst->child;
2759 } while (dst->xfrm);
2760
2761 if (likely(!last))
2762 return 1;
2763
2764 mtu = last->child_mtu_cached;
2765 for (;;) {
2766 dst = &last->u.dst;
2767
2768 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2769 if (mtu > last->route_mtu_cached)
2770 mtu = last->route_mtu_cached;
David S. Millerdefb3512010-12-08 21:16:57 -08002771 dst_metric_set(dst, RTAX_MTU, mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002772
2773 if (last == first)
2774 break;
2775
Patrick McHardybd0bf072007-07-18 01:55:52 -07002776 last = (struct xfrm_dst *)last->u.dst.next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002777 last->child_mtu_cached = mtu;
2778 }
2779
2780 return 1;
2781}
2782
David S. Miller0dbaee32010-12-13 12:52:14 -08002783static unsigned int xfrm_default_advmss(const struct dst_entry *dst)
2784{
2785 return dst_metric_advmss(dst->path);
2786}
2787
Steffen Klassertebb762f2011-11-23 02:12:51 +00002788static unsigned int xfrm_mtu(const struct dst_entry *dst)
David S. Millerd33e4552010-12-14 13:01:14 -08002789{
Steffen Klassert618f9bc2011-11-23 02:13:31 +00002790 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
2791
2792 return mtu ? : dst_mtu(dst->path);
David S. Millerd33e4552010-12-14 13:01:14 -08002793}
2794
Julian Anastasov1ecc9ad2017-02-25 17:57:43 +02002795static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst,
2796 const void *daddr)
Julian Anastasov63fca652017-02-06 23:14:15 +02002797{
2798 const struct dst_entry *path = dst->path;
2799
2800 for (; dst != path; dst = dst->child) {
2801 const struct xfrm_state *xfrm = dst->xfrm;
2802
2803 if (xfrm->props.mode == XFRM_MODE_TRANSPORT)
2804 continue;
2805 if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR)
2806 daddr = xfrm->coaddr;
2807 else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR))
2808 daddr = &xfrm->id.daddr;
2809 }
Julian Anastasov1ecc9ad2017-02-25 17:57:43 +02002810 return daddr;
2811}
2812
2813static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst,
2814 struct sk_buff *skb,
2815 const void *daddr)
2816{
2817 const struct dst_entry *path = dst->path;
2818
2819 if (!skb)
2820 daddr = xfrm_get_dst_nexthop(dst, daddr);
2821 return path->ops->neigh_lookup(path, skb, daddr);
2822}
2823
2824static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr)
2825{
2826 const struct dst_entry *path = dst->path;
2827
2828 daddr = xfrm_get_dst_nexthop(dst, daddr);
Julian Anastasov63fca652017-02-06 23:14:15 +02002829 path->ops->confirm_neigh(path, daddr);
2830}
2831
Florian Westphala2817d82017-02-07 15:00:17 +01002832int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002833{
2834 int err = 0;
Florian Westphala2817d82017-02-07 15:00:17 +01002835
2836 if (WARN_ON(family >= ARRAY_SIZE(xfrm_policy_afinfo)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002837 return -EAFNOSUPPORT;
Florian Westphala2817d82017-02-07 15:00:17 +01002838
Eric Dumazetef8531b2012-08-19 12:31:48 +02002839 spin_lock(&xfrm_policy_afinfo_lock);
Florian Westphala2817d82017-02-07 15:00:17 +01002840 if (unlikely(xfrm_policy_afinfo[family] != NULL))
Li RongQingf31e8d4f2015-04-23 11:06:53 +08002841 err = -EEXIST;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002842 else {
2843 struct dst_ops *dst_ops = afinfo->dst_ops;
2844 if (likely(dst_ops->kmem_cachep == NULL))
2845 dst_ops->kmem_cachep = xfrm_dst_cache;
2846 if (likely(dst_ops->check == NULL))
2847 dst_ops->check = xfrm_dst_check;
David S. Miller0dbaee32010-12-13 12:52:14 -08002848 if (likely(dst_ops->default_advmss == NULL))
2849 dst_ops->default_advmss = xfrm_default_advmss;
Steffen Klassertebb762f2011-11-23 02:12:51 +00002850 if (likely(dst_ops->mtu == NULL))
2851 dst_ops->mtu = xfrm_mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002852 if (likely(dst_ops->negative_advice == NULL))
2853 dst_ops->negative_advice = xfrm_negative_advice;
2854 if (likely(dst_ops->link_failure == NULL))
2855 dst_ops->link_failure = xfrm_link_failure;
David S. Millerd3aaeb32011-07-18 00:40:17 -07002856 if (likely(dst_ops->neigh_lookup == NULL))
2857 dst_ops->neigh_lookup = xfrm_neigh_lookup;
Julian Anastasov63fca652017-02-06 23:14:15 +02002858 if (likely(!dst_ops->confirm_neigh))
2859 dst_ops->confirm_neigh = xfrm_confirm_neigh;
Florian Westphala2817d82017-02-07 15:00:17 +01002860 rcu_assign_pointer(xfrm_policy_afinfo[family], afinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002861 }
Eric Dumazetef8531b2012-08-19 12:31:48 +02002862 spin_unlock(&xfrm_policy_afinfo_lock);
Alexey Dobriyand7c75442010-01-24 22:47:53 -08002863
Linus Torvalds1da177e2005-04-16 15:20:36 -07002864 return err;
2865}
2866EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2867
Florian Westphala2817d82017-02-07 15:00:17 +01002868void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002869{
Florian Westphal2b619972017-02-07 15:00:15 +01002870 struct dst_ops *dst_ops = afinfo->dst_ops;
Florian Westphala2817d82017-02-07 15:00:17 +01002871 int i;
Eric Dumazetef8531b2012-08-19 12:31:48 +02002872
Florian Westphala2817d82017-02-07 15:00:17 +01002873 for (i = 0; i < ARRAY_SIZE(xfrm_policy_afinfo); i++) {
2874 if (xfrm_policy_afinfo[i] != afinfo)
2875 continue;
2876 RCU_INIT_POINTER(xfrm_policy_afinfo[i], NULL);
2877 break;
Eric Dumazetef8531b2012-08-19 12:31:48 +02002878 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002879
Florian Westphal2b619972017-02-07 15:00:15 +01002880 synchronize_rcu();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002881
Florian Westphal2b619972017-02-07 15:00:15 +01002882 dst_ops->kmem_cachep = NULL;
2883 dst_ops->check = NULL;
2884 dst_ops->negative_advice = NULL;
2885 dst_ops->link_failure = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002886}
2887EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2888
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002889#ifdef CONFIG_XFRM_STATISTICS
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002890static int __net_init xfrm_statistics_init(struct net *net)
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002891{
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08002892 int rv;
WANG Cong698365f2014-05-05 15:55:55 -07002893 net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib);
2894 if (!net->mib.xfrm_statistics)
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002895 return -ENOMEM;
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08002896 rv = xfrm_proc_init(net);
2897 if (rv < 0)
WANG Cong698365f2014-05-05 15:55:55 -07002898 free_percpu(net->mib.xfrm_statistics);
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08002899 return rv;
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002900}
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002901
2902static void xfrm_statistics_fini(struct net *net)
2903{
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08002904 xfrm_proc_fini(net);
WANG Cong698365f2014-05-05 15:55:55 -07002905 free_percpu(net->mib.xfrm_statistics);
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002906}
2907#else
2908static int __net_init xfrm_statistics_init(struct net *net)
2909{
2910 return 0;
2911}
2912
2913static void xfrm_statistics_fini(struct net *net)
2914{
2915}
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002916#endif
2917
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002918static int __net_init xfrm_policy_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002919{
David S. Miller2518c7c2006-08-24 04:45:07 -07002920 unsigned int hmask, sz;
2921 int dir;
2922
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002923 if (net_eq(net, &init_net))
2924 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002925 sizeof(struct xfrm_dst),
Alexey Dobriyane5d679f332006-08-26 19:25:52 -07002926 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
Paul Mundt20c2df82007-07-20 10:11:58 +09002927 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002928
David S. Miller2518c7c2006-08-24 04:45:07 -07002929 hmask = 8 - 1;
2930 sz = (hmask+1) * sizeof(struct hlist_head);
2931
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002932 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2933 if (!net->xfrm.policy_byidx)
2934 goto out_byidx;
Alexey Dobriyan8100bea2008-11-25 17:22:58 -08002935 net->xfrm.policy_idx_hmask = hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -07002936
Herbert Xu53c2e282014-11-13 17:09:49 +08002937 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
David S. Miller2518c7c2006-08-24 04:45:07 -07002938 struct xfrm_policy_hash *htab;
2939
Alexey Dobriyandc2caba2008-11-25 17:24:15 -08002940 net->xfrm.policy_count[dir] = 0;
Herbert Xu53c2e282014-11-13 17:09:49 +08002941 net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0;
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002942 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
David S. Miller2518c7c2006-08-24 04:45:07 -07002943
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002944 htab = &net->xfrm.policy_bydst[dir];
David S. Miller44e36b42006-08-24 04:50:50 -07002945 htab->table = xfrm_hash_alloc(sz);
David S. Miller2518c7c2006-08-24 04:45:07 -07002946 if (!htab->table)
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002947 goto out_bydst;
2948 htab->hmask = hmask;
Christophe Gouaultb58555f2014-08-29 16:16:04 +02002949 htab->dbits4 = 32;
2950 htab->sbits4 = 32;
2951 htab->dbits6 = 128;
2952 htab->sbits6 = 128;
David S. Miller2518c7c2006-08-24 04:45:07 -07002953 }
Christophe Gouault880a6fa2014-08-29 16:16:05 +02002954 net->xfrm.policy_hthresh.lbits4 = 32;
2955 net->xfrm.policy_hthresh.rbits4 = 32;
2956 net->xfrm.policy_hthresh.lbits6 = 128;
2957 net->xfrm.policy_hthresh.rbits6 = 128;
2958
2959 seqlock_init(&net->xfrm.policy_hthresh.lock);
David S. Miller2518c7c2006-08-24 04:45:07 -07002960
Alexey Dobriyanadfcf0b2008-11-25 17:22:11 -08002961 INIT_LIST_HEAD(&net->xfrm.policy_all);
Alexey Dobriyan66caf622008-11-25 17:28:57 -08002962 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
Christophe Gouault880a6fa2014-08-29 16:16:05 +02002963 INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002964 if (net_eq(net, &init_net))
Steffen Klassert21f42cc2017-04-14 10:05:53 +02002965 xfrm_dev_init();
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002966 return 0;
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002967
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002968out_bydst:
2969 for (dir--; dir >= 0; dir--) {
2970 struct xfrm_policy_hash *htab;
2971
2972 htab = &net->xfrm.policy_bydst[dir];
2973 xfrm_hash_free(htab->table, sz);
2974 }
2975 xfrm_hash_free(net->xfrm.policy_byidx, sz);
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002976out_byidx:
2977 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002978}
2979
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002980static void xfrm_policy_fini(struct net *net)
2981{
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002982 unsigned int sz;
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002983 int dir;
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002984
Alexey Dobriyan7c2776e2008-11-25 17:57:44 -08002985 flush_work(&net->xfrm.policy_hash_work);
2986#ifdef CONFIG_XFRM_SUB_POLICY
Tetsuo Handa2e710292014-04-22 21:48:30 +09002987 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false);
Alexey Dobriyan7c2776e2008-11-25 17:57:44 -08002988#endif
Tetsuo Handa2e710292014-04-22 21:48:30 +09002989 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false);
Alexey Dobriyan7c2776e2008-11-25 17:57:44 -08002990
Alexey Dobriyanadfcf0b2008-11-25 17:22:11 -08002991 WARN_ON(!list_empty(&net->xfrm.policy_all));
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002992
Herbert Xu53c2e282014-11-13 17:09:49 +08002993 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002994 struct xfrm_policy_hash *htab;
2995
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002996 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002997
2998 htab = &net->xfrm.policy_bydst[dir];
Michal Kubecek5b653b22013-01-18 16:03:48 +01002999 sz = (htab->hmask + 1) * sizeof(struct hlist_head);
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08003000 WARN_ON(!hlist_empty(htab->table));
3001 xfrm_hash_free(htab->table, sz);
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08003002 }
3003
Alexey Dobriyan8100bea2008-11-25 17:22:58 -08003004 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08003005 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
3006 xfrm_hash_free(net->xfrm.policy_byidx, sz);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08003007}
3008
3009static int __net_init xfrm_net_init(struct net *net)
3010{
3011 int rv;
3012
Florian Westphalc2822222017-02-08 11:52:29 +01003013 /* Initialize the per-net locks here */
3014 spin_lock_init(&net->xfrm.xfrm_state_lock);
3015 spin_lock_init(&net->xfrm.xfrm_policy_lock);
3016 mutex_init(&net->xfrm.xfrm_cfg_mutex);
3017
Alexey Dobriyan59c99402008-11-25 17:59:52 -08003018 rv = xfrm_statistics_init(net);
3019 if (rv < 0)
3020 goto out_statistics;
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08003021 rv = xfrm_state_init(net);
3022 if (rv < 0)
3023 goto out_state;
3024 rv = xfrm_policy_init(net);
3025 if (rv < 0)
3026 goto out_policy;
Alexey Dobriyanb27aead2008-11-25 18:00:48 -08003027 rv = xfrm_sysctl_init(net);
3028 if (rv < 0)
3029 goto out_sysctl;
Steffen Klassert4a93f502014-03-12 09:43:17 +01003030 rv = flow_cache_init(net);
3031 if (rv < 0)
3032 goto out;
Fan Du283bc9f2013-11-07 17:47:50 +08003033
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08003034 return 0;
3035
Steffen Klassert4a93f502014-03-12 09:43:17 +01003036out:
3037 xfrm_sysctl_fini(net);
Alexey Dobriyanb27aead2008-11-25 18:00:48 -08003038out_sysctl:
3039 xfrm_policy_fini(net);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08003040out_policy:
3041 xfrm_state_fini(net);
3042out_state:
Alexey Dobriyan59c99402008-11-25 17:59:52 -08003043 xfrm_statistics_fini(net);
3044out_statistics:
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08003045 return rv;
3046}
3047
3048static void __net_exit xfrm_net_exit(struct net *net)
3049{
Steffen Klassert4a93f502014-03-12 09:43:17 +01003050 flow_cache_fini(net);
Alexey Dobriyanb27aead2008-11-25 18:00:48 -08003051 xfrm_sysctl_fini(net);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08003052 xfrm_policy_fini(net);
3053 xfrm_state_fini(net);
Alexey Dobriyan59c99402008-11-25 17:59:52 -08003054 xfrm_statistics_fini(net);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08003055}
3056
3057static struct pernet_operations __net_initdata xfrm_net_ops = {
3058 .init = xfrm_net_init,
3059 .exit = xfrm_net_exit,
3060};
3061
Linus Torvalds1da177e2005-04-16 15:20:36 -07003062void __init xfrm_init(void)
3063{
Sebastian Andrzej Siewiora4fc1bf2016-11-03 15:50:05 +01003064 flow_cache_hp_init();
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08003065 register_pernet_subsys(&xfrm_net_ops);
Florian Westphal30846092016-08-11 15:17:54 +02003066 seqcount_init(&xfrm_policy_hash_generation);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003067 xfrm_input_init();
3068}
3069
Joy Lattenab5f5e82007-09-17 11:51:22 -07003070#ifdef CONFIG_AUDITSYSCALL
Ilpo Järvinen1486cbd72008-01-12 03:20:03 -08003071static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
3072 struct audit_buffer *audit_buf)
Joy Lattenab5f5e82007-09-17 11:51:22 -07003073{
Paul Moore875179f2007-12-01 23:27:18 +11003074 struct xfrm_sec_ctx *ctx = xp->security;
3075 struct xfrm_selector *sel = &xp->selector;
Joy Lattenab5f5e82007-09-17 11:51:22 -07003076
Paul Moore875179f2007-12-01 23:27:18 +11003077 if (ctx)
3078 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
3079 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
3080
Weilong Chen9b7a7872013-12-24 09:43:46 +08003081 switch (sel->family) {
Joy Lattenab5f5e82007-09-17 11:51:22 -07003082 case AF_INET:
Harvey Harrison21454aa2008-10-31 00:54:56 -07003083 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
Paul Moore875179f2007-12-01 23:27:18 +11003084 if (sel->prefixlen_s != 32)
3085 audit_log_format(audit_buf, " src_prefixlen=%d",
3086 sel->prefixlen_s);
Harvey Harrison21454aa2008-10-31 00:54:56 -07003087 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
Paul Moore875179f2007-12-01 23:27:18 +11003088 if (sel->prefixlen_d != 32)
3089 audit_log_format(audit_buf, " dst_prefixlen=%d",
3090 sel->prefixlen_d);
Joy Lattenab5f5e82007-09-17 11:51:22 -07003091 break;
3092 case AF_INET6:
Harvey Harrison5b095d9892008-10-29 12:52:50 -07003093 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
Paul Moore875179f2007-12-01 23:27:18 +11003094 if (sel->prefixlen_s != 128)
3095 audit_log_format(audit_buf, " src_prefixlen=%d",
3096 sel->prefixlen_s);
Harvey Harrison5b095d9892008-10-29 12:52:50 -07003097 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
Paul Moore875179f2007-12-01 23:27:18 +11003098 if (sel->prefixlen_d != 128)
3099 audit_log_format(audit_buf, " dst_prefixlen=%d",
3100 sel->prefixlen_d);
Joy Lattenab5f5e82007-09-17 11:51:22 -07003101 break;
3102 }
3103}
3104
Tetsuo Handa2e710292014-04-22 21:48:30 +09003105void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid)
Joy Lattenab5f5e82007-09-17 11:51:22 -07003106{
3107 struct audit_buffer *audit_buf;
Joy Lattenab5f5e82007-09-17 11:51:22 -07003108
Paul Mooreafeb14b2007-12-21 14:58:11 -08003109 audit_buf = xfrm_audit_start("SPD-add");
Joy Lattenab5f5e82007-09-17 11:51:22 -07003110 if (audit_buf == NULL)
3111 return;
Tetsuo Handa2e710292014-04-22 21:48:30 +09003112 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
Paul Mooreafeb14b2007-12-21 14:58:11 -08003113 audit_log_format(audit_buf, " res=%u", result);
Joy Lattenab5f5e82007-09-17 11:51:22 -07003114 xfrm_audit_common_policyinfo(xp, audit_buf);
3115 audit_log_end(audit_buf);
3116}
3117EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
3118
Paul Moore68277ac2007-12-20 20:49:33 -08003119void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
Tetsuo Handa2e710292014-04-22 21:48:30 +09003120 bool task_valid)
Joy Lattenab5f5e82007-09-17 11:51:22 -07003121{
3122 struct audit_buffer *audit_buf;
Joy Lattenab5f5e82007-09-17 11:51:22 -07003123
Paul Mooreafeb14b2007-12-21 14:58:11 -08003124 audit_buf = xfrm_audit_start("SPD-delete");
Joy Lattenab5f5e82007-09-17 11:51:22 -07003125 if (audit_buf == NULL)
3126 return;
Tetsuo Handa2e710292014-04-22 21:48:30 +09003127 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
Paul Mooreafeb14b2007-12-21 14:58:11 -08003128 audit_log_format(audit_buf, " res=%u", result);
Joy Lattenab5f5e82007-09-17 11:51:22 -07003129 xfrm_audit_common_policyinfo(xp, audit_buf);
3130 audit_log_end(audit_buf);
3131}
3132EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
3133#endif
3134
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003135#ifdef CONFIG_XFRM_MIGRATE
David S. Millerbc9b35a2012-05-15 15:04:57 -04003136static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp,
3137 const struct xfrm_selector *sel_tgt)
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003138{
3139 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
3140 if (sel_tgt->family == sel_cmp->family &&
YOSHIFUJI Hideaki / 吉藤英明70e94e62013-01-29 12:48:50 +00003141 xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr,
3142 sel_cmp->family) &&
3143 xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr,
3144 sel_cmp->family) &&
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003145 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
3146 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
David S. Millerbc9b35a2012-05-15 15:04:57 -04003147 return true;
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003148 }
3149 } else {
3150 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
David S. Millerbc9b35a2012-05-15 15:04:57 -04003151 return true;
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003152 }
3153 }
David S. Millerbc9b35a2012-05-15 15:04:57 -04003154 return false;
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003155}
3156
Weilong Chen3e94c2d2013-12-24 09:43:47 +08003157static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel,
3158 u8 dir, u8 type, struct net *net)
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003159{
3160 struct xfrm_policy *pol, *ret = NULL;
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003161 struct hlist_head *chain;
3162 u32 priority = ~0U;
3163
Florian Westphal9d0380d2016-08-11 15:17:59 +02003164 spin_lock_bh(&net->xfrm.xfrm_policy_lock);
Fan Du8d549c42013-11-07 17:47:49 +08003165 chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir);
Sasha Levinb67bfe02013-02-27 17:06:00 -08003166 hlist_for_each_entry(pol, chain, bydst) {
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003167 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
3168 pol->type == type) {
3169 ret = pol;
3170 priority = ret->priority;
3171 break;
3172 }
3173 }
Fan Du8d549c42013-11-07 17:47:49 +08003174 chain = &net->xfrm.policy_inexact[dir];
Sasha Levinb67bfe02013-02-27 17:06:00 -08003175 hlist_for_each_entry(pol, chain, bydst) {
Li RongQing8faf4912015-05-14 11:16:59 +08003176 if ((pol->priority >= priority) && ret)
3177 break;
3178
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003179 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
Li RongQing8faf4912015-05-14 11:16:59 +08003180 pol->type == type) {
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003181 ret = pol;
3182 break;
3183 }
3184 }
3185
Li RongQing586f2eb2015-04-30 17:13:41 +08003186 xfrm_pol_hold(ret);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003187
Florian Westphal9d0380d2016-08-11 15:17:59 +02003188 spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003189
3190 return ret;
3191}
3192
David S. Millerdd701752011-02-24 00:21:08 -05003193static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t)
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003194{
3195 int match = 0;
3196
3197 if (t->mode == m->mode && t->id.proto == m->proto &&
3198 (m->reqid == 0 || t->reqid == m->reqid)) {
3199 switch (t->mode) {
3200 case XFRM_MODE_TUNNEL:
3201 case XFRM_MODE_BEET:
YOSHIFUJI Hideaki / 吉藤英明70e94e62013-01-29 12:48:50 +00003202 if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr,
3203 m->old_family) &&
3204 xfrm_addr_equal(&t->saddr, &m->old_saddr,
3205 m->old_family)) {
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003206 match = 1;
3207 }
3208 break;
3209 case XFRM_MODE_TRANSPORT:
3210 /* in case of transport mode, template does not store
3211 any IP addresses, hence we just compare mode and
3212 protocol */
3213 match = 1;
3214 break;
3215 default:
3216 break;
3217 }
3218 }
3219 return match;
3220}
3221
3222/* update endpoint address(es) of template(s) */
3223static int xfrm_policy_migrate(struct xfrm_policy *pol,
3224 struct xfrm_migrate *m, int num_migrate)
3225{
3226 struct xfrm_migrate *mp;
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003227 int i, j, n = 0;
3228
3229 write_lock_bh(&pol->lock);
Herbert Xu12a169e2008-10-01 07:03:24 -07003230 if (unlikely(pol->walk.dead)) {
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003231 /* target policy has been deleted */
3232 write_unlock_bh(&pol->lock);
3233 return -ENOENT;
3234 }
3235
3236 for (i = 0; i < pol->xfrm_nr; i++) {
3237 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
3238 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
3239 continue;
3240 n++;
Herbert Xu1bfcb102007-10-17 21:31:50 -07003241 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
3242 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003243 continue;
3244 /* update endpoints */
3245 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
3246 sizeof(pol->xfrm_vec[i].id.daddr));
3247 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
3248 sizeof(pol->xfrm_vec[i].saddr));
3249 pol->xfrm_vec[i].encap_family = mp->new_family;
3250 /* flush bundles */
Timo Teräs80c802f2010-04-07 00:30:05 +00003251 atomic_inc(&pol->genid);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003252 }
3253 }
3254
3255 write_unlock_bh(&pol->lock);
3256
3257 if (!n)
3258 return -ENODATA;
3259
3260 return 0;
3261}
3262
David S. Millerdd701752011-02-24 00:21:08 -05003263static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate)
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003264{
3265 int i, j;
3266
3267 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
3268 return -EINVAL;
3269
3270 for (i = 0; i < num_migrate; i++) {
YOSHIFUJI Hideaki / 吉藤英明70e94e62013-01-29 12:48:50 +00003271 if (xfrm_addr_equal(&m[i].old_daddr, &m[i].new_daddr,
3272 m[i].old_family) &&
3273 xfrm_addr_equal(&m[i].old_saddr, &m[i].new_saddr,
3274 m[i].old_family))
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003275 return -EINVAL;
3276 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
3277 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
3278 return -EINVAL;
3279
3280 /* check if there is any duplicated entry */
3281 for (j = i + 1; j < num_migrate; j++) {
3282 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
3283 sizeof(m[i].old_daddr)) &&
3284 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
3285 sizeof(m[i].old_saddr)) &&
3286 m[i].proto == m[j].proto &&
3287 m[i].mode == m[j].mode &&
3288 m[i].reqid == m[j].reqid &&
3289 m[i].old_family == m[j].old_family)
3290 return -EINVAL;
3291 }
3292 }
3293
3294 return 0;
3295}
3296
David S. Millerb4b7c0b2011-02-24 00:35:06 -05003297int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
Arnaud Ebalard13c1d182008-10-05 13:33:42 -07003298 struct xfrm_migrate *m, int num_migrate,
Fan Du8d549c42013-11-07 17:47:49 +08003299 struct xfrm_kmaddress *k, struct net *net)
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003300{
3301 int i, err, nx_cur = 0, nx_new = 0;
3302 struct xfrm_policy *pol = NULL;
3303 struct xfrm_state *x, *xc;
3304 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
3305 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
3306 struct xfrm_migrate *mp;
3307
3308 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
3309 goto out;
3310
3311 /* Stage 1 - find policy */
Fan Du8d549c42013-11-07 17:47:49 +08003312 if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003313 err = -ENOENT;
3314 goto out;
3315 }
3316
3317 /* Stage 2 - find and update state(s) */
3318 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
Fan Du283bc9f2013-11-07 17:47:50 +08003319 if ((x = xfrm_migrate_state_find(mp, net))) {
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003320 x_cur[nx_cur] = x;
3321 nx_cur++;
3322 if ((xc = xfrm_state_migrate(x, mp))) {
3323 x_new[nx_new] = xc;
3324 nx_new++;
3325 } else {
3326 err = -ENODATA;
3327 goto restore_state;
3328 }
3329 }
3330 }
3331
3332 /* Stage 3 - update policy */
3333 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
3334 goto restore_state;
3335
3336 /* Stage 4 - delete old state(s) */
3337 if (nx_cur) {
3338 xfrm_states_put(x_cur, nx_cur);
3339 xfrm_states_delete(x_cur, nx_cur);
3340 }
3341
3342 /* Stage 5 - announce */
Arnaud Ebalard13c1d182008-10-05 13:33:42 -07003343 km_migrate(sel, dir, type, m, num_migrate, k);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003344
3345 xfrm_pol_put(pol);
3346
3347 return 0;
3348out:
3349 return err;
3350
3351restore_state:
3352 if (pol)
3353 xfrm_pol_put(pol);
3354 if (nx_cur)
3355 xfrm_states_put(x_cur, nx_cur);
3356 if (nx_new)
3357 xfrm_states_delete(x_new, nx_new);
3358
3359 return err;
3360}
David S. Millere610e672007-02-08 13:29:15 -08003361EXPORT_SYMBOL(xfrm_migrate);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08003362#endif