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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <net/xfrm.h>
30#include <net/ip.h>
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -080031#ifdef CONFIG_XFRM_STATISTICS
32#include <net/snmp.h>
33#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
David S. Miller44e36b42006-08-24 04:50:50 -070035#include "xfrm_hash.h"
36
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080037DEFINE_MUTEX(xfrm_cfg_mutex);
38EXPORT_SYMBOL(xfrm_cfg_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Timo Teräs80c802f2010-04-07 00:30:05 +000040static DEFINE_SPINLOCK(xfrm_policy_sk_bundle_lock);
41static struct dst_entry *xfrm_policy_sk_bundles;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042static DEFINE_RWLOCK(xfrm_policy_lock);
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
45static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
46
Christoph Lametere18b8902006-12-06 20:33:20 -080047static struct kmem_cache *xfrm_dst_cache __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Linus Torvalds1da177e2005-04-16 15:20:36 -070049static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
50static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
Herbert Xu25ee3282007-12-11 09:32:34 -080051static void xfrm_init_pmtu(struct dst_entry *dst);
Timo Teräs80c802f2010-04-07 00:30:05 +000052static int stale_bundle(struct dst_entry *dst);
stephen hemminger1c4c40c2010-10-15 05:14:19 +000053static int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
54 struct flowi *fl, int family, int strict);
55
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Wei Yongjun29fa0b302008-12-03 00:33:09 -080057static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
58 int dir);
59
Andrew Morton77681022006-11-08 22:46:26 -080060static inline int
61__xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
62{
63 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
64 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
65 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
66 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
67 (fl->proto == sel->proto || !sel->proto) &&
68 (fl->oif == sel->ifindex || !sel->ifindex);
69}
70
71static inline int
72__xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
73{
74 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
75 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
76 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
77 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
78 (fl->proto == sel->proto || !sel->proto) &&
79 (fl->oif == sel->ifindex || !sel->ifindex);
80}
81
82int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
83 unsigned short family)
84{
85 switch (family) {
86 case AF_INET:
87 return __xfrm4_selector_match(sel, fl);
88 case AF_INET6:
89 return __xfrm6_selector_match(sel, fl);
90 }
91 return 0;
92}
93
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -080094static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +090095 xfrm_address_t *saddr,
96 xfrm_address_t *daddr,
97 int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
Herbert Xu66cdb3c2007-11-13 21:37:28 -080099 struct xfrm_policy_afinfo *afinfo;
100 struct dst_entry *dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
Herbert Xu25ee3282007-12-11 09:32:34 -0800102 afinfo = xfrm_policy_get_afinfo(family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 if (unlikely(afinfo == NULL))
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800104 return ERR_PTR(-EAFNOSUPPORT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -0800106 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 xfrm_policy_put_afinfo(afinfo);
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900109
110 return dst;
111}
112
113static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
114 xfrm_address_t *prev_saddr,
115 xfrm_address_t *prev_daddr,
116 int family)
117{
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -0800118 struct net *net = xs_net(x);
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900119 xfrm_address_t *saddr = &x->props.saddr;
120 xfrm_address_t *daddr = &x->id.daddr;
121 struct dst_entry *dst;
122
123 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
124 saddr = x->coaddr;
125 daddr = prev_daddr;
126 }
127 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
128 saddr = prev_saddr;
129 daddr = x->coaddr;
130 }
131
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -0800132 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900133
134 if (!IS_ERR(dst)) {
135 if (prev_saddr != saddr)
136 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
137 if (prev_daddr != daddr)
138 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
139 }
140
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800141 return dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144static inline unsigned long make_jiffies(long secs)
145{
146 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
147 return MAX_SCHEDULE_TIMEOUT-1;
148 else
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900149 return secs*HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
152static void xfrm_policy_timer(unsigned long data)
153{
154 struct xfrm_policy *xp = (struct xfrm_policy*)data;
James Morris9d729f72007-03-04 16:12:44 -0800155 unsigned long now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 long next = LONG_MAX;
157 int warn = 0;
158 int dir;
159
160 read_lock(&xp->lock);
161
Timo Teräsea2dea92010-03-31 00:17:05 +0000162 if (unlikely(xp->walk.dead))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 goto out;
164
Herbert Xu77d8d7a2005-10-05 12:15:12 -0700165 dir = xfrm_policy_id2dir(xp->index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
167 if (xp->lft.hard_add_expires_seconds) {
168 long tmo = xp->lft.hard_add_expires_seconds +
169 xp->curlft.add_time - now;
170 if (tmo <= 0)
171 goto expired;
172 if (tmo < next)
173 next = tmo;
174 }
175 if (xp->lft.hard_use_expires_seconds) {
176 long tmo = xp->lft.hard_use_expires_seconds +
177 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
178 if (tmo <= 0)
179 goto expired;
180 if (tmo < next)
181 next = tmo;
182 }
183 if (xp->lft.soft_add_expires_seconds) {
184 long tmo = xp->lft.soft_add_expires_seconds +
185 xp->curlft.add_time - now;
186 if (tmo <= 0) {
187 warn = 1;
188 tmo = XFRM_KM_TIMEOUT;
189 }
190 if (tmo < next)
191 next = tmo;
192 }
193 if (xp->lft.soft_use_expires_seconds) {
194 long tmo = xp->lft.soft_use_expires_seconds +
195 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
196 if (tmo <= 0) {
197 warn = 1;
198 tmo = XFRM_KM_TIMEOUT;
199 }
200 if (tmo < next)
201 next = tmo;
202 }
203
204 if (warn)
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -0800205 km_policy_expired(xp, dir, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 if (next != LONG_MAX &&
207 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
208 xfrm_pol_hold(xp);
209
210out:
211 read_unlock(&xp->lock);
212 xfrm_pol_put(xp);
213 return;
214
215expired:
216 read_unlock(&xp->lock);
Herbert Xu4666faa2005-06-18 22:43:22 -0700217 if (!xfrm_policy_delete(xp, dir))
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -0800218 km_policy_expired(xp, dir, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 xfrm_pol_put(xp);
220}
221
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000222static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
223{
224 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
225
226 if (unlikely(pol->walk.dead))
227 flo = NULL;
228 else
229 xfrm_pol_hold(pol);
230
231 return flo;
232}
233
234static int xfrm_policy_flo_check(struct flow_cache_object *flo)
235{
236 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
237
238 return !pol->walk.dead;
239}
240
241static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
242{
243 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
244}
245
246static const struct flow_cache_ops xfrm_policy_fc_ops = {
247 .get = xfrm_policy_flo_get,
248 .check = xfrm_policy_flo_check,
249 .delete = xfrm_policy_flo_delete,
250};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
253 * SPD calls.
254 */
255
Alexey Dobriyan0331b1f2008-11-25 17:21:45 -0800256struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257{
258 struct xfrm_policy *policy;
259
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700260 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262 if (policy) {
Alexey Dobriyan0331b1f2008-11-25 17:21:45 -0800263 write_pnet(&policy->xp_net, net);
Herbert Xu12a169e2008-10-01 07:03:24 -0700264 INIT_LIST_HEAD(&policy->walk.all);
David S. Miller2518c7c2006-08-24 04:45:07 -0700265 INIT_HLIST_NODE(&policy->bydst);
266 INIT_HLIST_NODE(&policy->byidx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 rwlock_init(&policy->lock);
David S. Miller2518c7c2006-08-24 04:45:07 -0700268 atomic_set(&policy->refcnt, 1);
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -0800269 setup_timer(&policy->timer, xfrm_policy_timer,
270 (unsigned long)policy);
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000271 policy->flo.ops = &xfrm_policy_fc_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273 return policy;
274}
275EXPORT_SYMBOL(xfrm_policy_alloc);
276
277/* Destroy xfrm_policy: descendant resources must be released to this moment. */
278
WANG Cong64c31b32008-01-07 22:34:29 -0800279void xfrm_policy_destroy(struct xfrm_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280{
Herbert Xu12a169e2008-10-01 07:03:24 -0700281 BUG_ON(!policy->walk.dead);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 if (del_timer(&policy->timer))
284 BUG();
285
Paul Moore03e1ad72008-04-12 19:07:52 -0700286 security_xfrm_policy_free(policy->security);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 kfree(policy);
288}
WANG Cong64c31b32008-01-07 22:34:29 -0800289EXPORT_SYMBOL(xfrm_policy_destroy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291/* Rule must be locked. Release descentant resources, announce
292 * entry dead. The rule must be unlinked from lists to the moment.
293 */
294
295static void xfrm_policy_kill(struct xfrm_policy *policy)
296{
Herbert Xu12a169e2008-10-01 07:03:24 -0700297 policy->walk.dead = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Timo Teräs285ead12010-04-07 00:30:06 +0000299 atomic_inc(&policy->genid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Timo Teräs285ead12010-04-07 00:30:06 +0000301 if (del_timer(&policy->timer))
302 xfrm_pol_put(policy);
303
304 xfrm_pol_put(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305}
306
David S. Miller2518c7c2006-08-24 04:45:07 -0700307static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
308
Alexey Dobriyane92303f2008-11-25 17:32:41 -0800309static inline unsigned int idx_hash(struct net *net, u32 index)
David S. Miller2518c7c2006-08-24 04:45:07 -0700310{
Alexey Dobriyane92303f2008-11-25 17:32:41 -0800311 return __idx_hash(index, net->xfrm.policy_idx_hmask);
David S. Miller2518c7c2006-08-24 04:45:07 -0700312}
313
Alexey Dobriyan11219942008-11-25 17:33:06 -0800314static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir)
David S. Miller2518c7c2006-08-24 04:45:07 -0700315{
Alexey Dobriyan11219942008-11-25 17:33:06 -0800316 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700317 unsigned int hash = __sel_hash(sel, family, hmask);
318
319 return (hash == hmask + 1 ?
Alexey Dobriyan11219942008-11-25 17:33:06 -0800320 &net->xfrm.policy_inexact[dir] :
321 net->xfrm.policy_bydst[dir].table + hash);
David S. Miller2518c7c2006-08-24 04:45:07 -0700322}
323
Alexey Dobriyan11219942008-11-25 17:33:06 -0800324static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
David S. Miller2518c7c2006-08-24 04:45:07 -0700325{
Alexey Dobriyan11219942008-11-25 17:33:06 -0800326 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700327 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
328
Alexey Dobriyan11219942008-11-25 17:33:06 -0800329 return net->xfrm.policy_bydst[dir].table + hash;
David S. Miller2518c7c2006-08-24 04:45:07 -0700330}
331
David S. Miller2518c7c2006-08-24 04:45:07 -0700332static void xfrm_dst_hash_transfer(struct hlist_head *list,
333 struct hlist_head *ndsttable,
334 unsigned int nhashmask)
335{
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800336 struct hlist_node *entry, *tmp, *entry0 = NULL;
David S. Miller2518c7c2006-08-24 04:45:07 -0700337 struct xfrm_policy *pol;
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800338 unsigned int h0 = 0;
David S. Miller2518c7c2006-08-24 04:45:07 -0700339
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800340redo:
David S. Miller2518c7c2006-08-24 04:45:07 -0700341 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
342 unsigned int h;
343
344 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
345 pol->family, nhashmask);
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800346 if (!entry0) {
347 hlist_del(entry);
348 hlist_add_head(&pol->bydst, ndsttable+h);
349 h0 = h;
350 } else {
351 if (h != h0)
352 continue;
353 hlist_del(entry);
354 hlist_add_after(entry0, &pol->bydst);
355 }
356 entry0 = entry;
357 }
358 if (!hlist_empty(list)) {
359 entry0 = NULL;
360 goto redo;
David S. Miller2518c7c2006-08-24 04:45:07 -0700361 }
362}
363
364static void xfrm_idx_hash_transfer(struct hlist_head *list,
365 struct hlist_head *nidxtable,
366 unsigned int nhashmask)
367{
368 struct hlist_node *entry, *tmp;
369 struct xfrm_policy *pol;
370
371 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
372 unsigned int h;
373
374 h = __idx_hash(pol->index, nhashmask);
375 hlist_add_head(&pol->byidx, nidxtable+h);
376 }
377}
378
379static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
380{
381 return ((old_hmask + 1) << 1) - 1;
382}
383
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800384static void xfrm_bydst_resize(struct net *net, int dir)
David S. Miller2518c7c2006-08-24 04:45:07 -0700385{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800386 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700387 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
388 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800389 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
David S. Miller44e36b42006-08-24 04:50:50 -0700390 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
David S. Miller2518c7c2006-08-24 04:45:07 -0700391 int i;
392
393 if (!ndst)
394 return;
395
396 write_lock_bh(&xfrm_policy_lock);
397
398 for (i = hmask; i >= 0; i--)
399 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
400
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800401 net->xfrm.policy_bydst[dir].table = ndst;
402 net->xfrm.policy_bydst[dir].hmask = nhashmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700403
404 write_unlock_bh(&xfrm_policy_lock);
405
David S. Miller44e36b42006-08-24 04:50:50 -0700406 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
David S. Miller2518c7c2006-08-24 04:45:07 -0700407}
408
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800409static void xfrm_byidx_resize(struct net *net, int total)
David S. Miller2518c7c2006-08-24 04:45:07 -0700410{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800411 unsigned int hmask = net->xfrm.policy_idx_hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700412 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
413 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800414 struct hlist_head *oidx = net->xfrm.policy_byidx;
David S. Miller44e36b42006-08-24 04:50:50 -0700415 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
David S. Miller2518c7c2006-08-24 04:45:07 -0700416 int i;
417
418 if (!nidx)
419 return;
420
421 write_lock_bh(&xfrm_policy_lock);
422
423 for (i = hmask; i >= 0; i--)
424 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
425
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800426 net->xfrm.policy_byidx = nidx;
427 net->xfrm.policy_idx_hmask = nhashmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700428
429 write_unlock_bh(&xfrm_policy_lock);
430
David S. Miller44e36b42006-08-24 04:50:50 -0700431 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
David S. Miller2518c7c2006-08-24 04:45:07 -0700432}
433
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800434static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
David S. Miller2518c7c2006-08-24 04:45:07 -0700435{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800436 unsigned int cnt = net->xfrm.policy_count[dir];
437 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700438
439 if (total)
440 *total += cnt;
441
442 if ((hmask + 1) < xfrm_policy_hashmax &&
443 cnt > hmask)
444 return 1;
445
446 return 0;
447}
448
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800449static inline int xfrm_byidx_should_resize(struct net *net, int total)
David S. Miller2518c7c2006-08-24 04:45:07 -0700450{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800451 unsigned int hmask = net->xfrm.policy_idx_hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700452
453 if ((hmask + 1) < xfrm_policy_hashmax &&
454 total > hmask)
455 return 1;
456
457 return 0;
458}
459
Alexey Dobriyane0710412010-01-23 13:37:10 +0000460void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
Jamal Hadi Salimecfd6b12007-04-28 21:20:32 -0700461{
462 read_lock_bh(&xfrm_policy_lock);
Alexey Dobriyane0710412010-01-23 13:37:10 +0000463 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
464 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
465 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
466 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
467 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
468 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
469 si->spdhcnt = net->xfrm.policy_idx_hmask;
Jamal Hadi Salimecfd6b12007-04-28 21:20:32 -0700470 si->spdhmcnt = xfrm_policy_hashmax;
471 read_unlock_bh(&xfrm_policy_lock);
472}
473EXPORT_SYMBOL(xfrm_spd_getinfo);
David S. Miller2518c7c2006-08-24 04:45:07 -0700474
Jamal Hadi Salimecfd6b12007-04-28 21:20:32 -0700475static DEFINE_MUTEX(hash_resize_mutex);
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800476static void xfrm_hash_resize(struct work_struct *work)
David S. Miller2518c7c2006-08-24 04:45:07 -0700477{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800478 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
David S. Miller2518c7c2006-08-24 04:45:07 -0700479 int dir, total;
480
481 mutex_lock(&hash_resize_mutex);
482
483 total = 0;
484 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800485 if (xfrm_bydst_should_resize(net, dir, &total))
486 xfrm_bydst_resize(net, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700487 }
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800488 if (xfrm_byidx_should_resize(net, total))
489 xfrm_byidx_resize(net, total);
David S. Miller2518c7c2006-08-24 04:45:07 -0700490
491 mutex_unlock(&hash_resize_mutex);
492}
493
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494/* Generate new index... KAME seems to generate them ordered by cost
495 * of an absolute inpredictability of ordering of rules. This will not pass. */
Alexey Dobriyan11219942008-11-25 17:33:06 -0800496static u32 xfrm_gen_index(struct net *net, int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 static u32 idx_generator;
499
500 for (;;) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700501 struct hlist_node *entry;
502 struct hlist_head *list;
503 struct xfrm_policy *p;
504 u32 idx;
505 int found;
506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 idx = (idx_generator | dir);
508 idx_generator += 8;
509 if (idx == 0)
510 idx = 8;
Alexey Dobriyan11219942008-11-25 17:33:06 -0800511 list = net->xfrm.policy_byidx + idx_hash(net, idx);
David S. Miller2518c7c2006-08-24 04:45:07 -0700512 found = 0;
513 hlist_for_each_entry(p, entry, list, byidx) {
514 if (p->index == idx) {
515 found = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 break;
David S. Miller2518c7c2006-08-24 04:45:07 -0700517 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 }
David S. Miller2518c7c2006-08-24 04:45:07 -0700519 if (!found)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 return idx;
521 }
522}
523
David S. Miller2518c7c2006-08-24 04:45:07 -0700524static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
525{
526 u32 *p1 = (u32 *) s1;
527 u32 *p2 = (u32 *) s2;
528 int len = sizeof(struct xfrm_selector) / sizeof(u32);
529 int i;
530
531 for (i = 0; i < len; i++) {
532 if (p1[i] != p2[i])
533 return 1;
534 }
535
536 return 0;
537}
538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
540{
Alexey Dobriyan11219942008-11-25 17:33:06 -0800541 struct net *net = xp_net(policy);
David S. Miller2518c7c2006-08-24 04:45:07 -0700542 struct xfrm_policy *pol;
543 struct xfrm_policy *delpol;
544 struct hlist_head *chain;
Herbert Xua6c7ab52007-01-16 16:52:02 -0800545 struct hlist_node *entry, *newpos;
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +0000546 u32 mark = policy->mark.v & policy->mark.m;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
548 write_lock_bh(&xfrm_policy_lock);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800549 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700550 delpol = NULL;
551 newpos = NULL;
David S. Miller2518c7c2006-08-24 04:45:07 -0700552 hlist_for_each_entry(pol, entry, chain, bydst) {
Herbert Xua6c7ab52007-01-16 16:52:02 -0800553 if (pol->type == policy->type &&
David S. Miller2518c7c2006-08-24 04:45:07 -0700554 !selector_cmp(&pol->selector, &policy->selector) &&
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +0000555 (mark & pol->mark.m) == pol->mark.v &&
Herbert Xua6c7ab52007-01-16 16:52:02 -0800556 xfrm_sec_ctx_match(pol->security, policy->security) &&
557 !WARN_ON(delpol)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 if (excl) {
559 write_unlock_bh(&xfrm_policy_lock);
560 return -EEXIST;
561 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 delpol = pol;
563 if (policy->priority > pol->priority)
564 continue;
565 } else if (policy->priority >= pol->priority) {
Herbert Xua6c7ab52007-01-16 16:52:02 -0800566 newpos = &pol->bydst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 continue;
568 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 if (delpol)
570 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 }
572 if (newpos)
David S. Miller2518c7c2006-08-24 04:45:07 -0700573 hlist_add_after(newpos, &policy->bydst);
574 else
575 hlist_add_head(&policy->bydst, chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 xfrm_pol_hold(policy);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800577 net->xfrm.policy_count[dir]++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 atomic_inc(&flow_cache_genid);
Wei Yongjun29fa0b302008-12-03 00:33:09 -0800579 if (delpol)
580 __xfrm_policy_unlink(delpol, dir);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800581 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir);
582 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
James Morris9d729f72007-03-04 16:12:44 -0800583 policy->curlft.add_time = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 policy->curlft.use_time = 0;
585 if (!mod_timer(&policy->timer, jiffies + HZ))
586 xfrm_pol_hold(policy);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800587 list_add(&policy->walk.all, &net->xfrm.policy_all);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 write_unlock_bh(&xfrm_policy_lock);
589
David S. Miller9b78a822005-12-22 07:39:48 -0800590 if (delpol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 xfrm_policy_kill(delpol);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800592 else if (xfrm_bydst_should_resize(net, dir, NULL))
593 schedule_work(&net->xfrm.policy_hash_work);
David S. Miller9b78a822005-12-22 07:39:48 -0800594
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 return 0;
596}
597EXPORT_SYMBOL(xfrm_policy_insert);
598
Jamal Hadi Salim8ca2e932010-02-22 11:32:57 +0000599struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
600 int dir, struct xfrm_selector *sel,
Eric Parisef41aaa2007-03-07 15:37:58 -0800601 struct xfrm_sec_ctx *ctx, int delete,
602 int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603{
David S. Miller2518c7c2006-08-24 04:45:07 -0700604 struct xfrm_policy *pol, *ret;
605 struct hlist_head *chain;
606 struct hlist_node *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
Eric Parisef41aaa2007-03-07 15:37:58 -0800608 *err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 write_lock_bh(&xfrm_policy_lock);
Alexey Dobriyan8d1211a2008-11-25 17:34:20 -0800610 chain = policy_hash_bysel(net, sel, sel->family, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700611 ret = NULL;
612 hlist_for_each_entry(pol, entry, chain, bydst) {
613 if (pol->type == type &&
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +0000614 (mark & pol->mark.m) == pol->mark.v &&
David S. Miller2518c7c2006-08-24 04:45:07 -0700615 !selector_cmp(sel, &pol->selector) &&
616 xfrm_sec_ctx_match(ctx, pol->security)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 xfrm_pol_hold(pol);
David S. Miller2518c7c2006-08-24 04:45:07 -0700618 if (delete) {
Paul Moore03e1ad72008-04-12 19:07:52 -0700619 *err = security_xfrm_policy_delete(
620 pol->security);
Eric Parisef41aaa2007-03-07 15:37:58 -0800621 if (*err) {
622 write_unlock_bh(&xfrm_policy_lock);
623 return pol;
624 }
Wei Yongjun29fa0b302008-12-03 00:33:09 -0800625 __xfrm_policy_unlink(pol, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700626 }
627 ret = pol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 break;
629 }
630 }
631 write_unlock_bh(&xfrm_policy_lock);
632
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000633 if (ret && delete)
David S. Miller2518c7c2006-08-24 04:45:07 -0700634 xfrm_policy_kill(ret);
David S. Miller2518c7c2006-08-24 04:45:07 -0700635 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636}
Trent Jaegerdf718372005-12-13 23:12:27 -0800637EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
Jamal Hadi Salim8ca2e932010-02-22 11:32:57 +0000639struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
640 int dir, u32 id, int delete, int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641{
David S. Miller2518c7c2006-08-24 04:45:07 -0700642 struct xfrm_policy *pol, *ret;
643 struct hlist_head *chain;
644 struct hlist_node *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
Herbert Xub5505c62007-05-14 02:15:47 -0700646 *err = -ENOENT;
647 if (xfrm_policy_id2dir(id) != dir)
648 return NULL;
649
Eric Parisef41aaa2007-03-07 15:37:58 -0800650 *err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 write_lock_bh(&xfrm_policy_lock);
Alexey Dobriyan8d1211a2008-11-25 17:34:20 -0800652 chain = net->xfrm.policy_byidx + idx_hash(net, id);
David S. Miller2518c7c2006-08-24 04:45:07 -0700653 ret = NULL;
654 hlist_for_each_entry(pol, entry, chain, byidx) {
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +0000655 if (pol->type == type && pol->index == id &&
656 (mark & pol->mark.m) == pol->mark.v) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 xfrm_pol_hold(pol);
David S. Miller2518c7c2006-08-24 04:45:07 -0700658 if (delete) {
Paul Moore03e1ad72008-04-12 19:07:52 -0700659 *err = security_xfrm_policy_delete(
660 pol->security);
Eric Parisef41aaa2007-03-07 15:37:58 -0800661 if (*err) {
662 write_unlock_bh(&xfrm_policy_lock);
663 return pol;
664 }
Wei Yongjun29fa0b302008-12-03 00:33:09 -0800665 __xfrm_policy_unlink(pol, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700666 }
667 ret = pol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 break;
669 }
670 }
671 write_unlock_bh(&xfrm_policy_lock);
672
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000673 if (ret && delete)
David S. Miller2518c7c2006-08-24 04:45:07 -0700674 xfrm_policy_kill(ret);
David S. Miller2518c7c2006-08-24 04:45:07 -0700675 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676}
677EXPORT_SYMBOL(xfrm_policy_byid);
678
Joy Latten4aa2e622007-06-04 19:05:57 -0400679#ifdef CONFIG_SECURITY_NETWORK_XFRM
680static inline int
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800681xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682{
Joy Latten4aa2e622007-06-04 19:05:57 -0400683 int dir, err = 0;
684
685 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
686 struct xfrm_policy *pol;
687 struct hlist_node *entry;
688 int i;
689
690 hlist_for_each_entry(pol, entry,
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800691 &net->xfrm.policy_inexact[dir], bydst) {
Joy Latten4aa2e622007-06-04 19:05:57 -0400692 if (pol->type != type)
693 continue;
Paul Moore03e1ad72008-04-12 19:07:52 -0700694 err = security_xfrm_policy_delete(pol->security);
Joy Latten4aa2e622007-06-04 19:05:57 -0400695 if (err) {
Joy Lattenab5f5e82007-09-17 11:51:22 -0700696 xfrm_audit_policy_delete(pol, 0,
697 audit_info->loginuid,
Eric Paris25323862008-04-18 10:09:25 -0400698 audit_info->sessionid,
Joy Lattenab5f5e82007-09-17 11:51:22 -0700699 audit_info->secid);
Joy Latten4aa2e622007-06-04 19:05:57 -0400700 return err;
701 }
YOSHIFUJI Hideaki7dc12d62007-07-19 10:45:15 +0900702 }
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800703 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
Joy Latten4aa2e622007-06-04 19:05:57 -0400704 hlist_for_each_entry(pol, entry,
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800705 net->xfrm.policy_bydst[dir].table + i,
Joy Latten4aa2e622007-06-04 19:05:57 -0400706 bydst) {
707 if (pol->type != type)
708 continue;
Paul Moore03e1ad72008-04-12 19:07:52 -0700709 err = security_xfrm_policy_delete(
710 pol->security);
Joy Latten4aa2e622007-06-04 19:05:57 -0400711 if (err) {
Joy Lattenab5f5e82007-09-17 11:51:22 -0700712 xfrm_audit_policy_delete(pol, 0,
713 audit_info->loginuid,
Eric Paris25323862008-04-18 10:09:25 -0400714 audit_info->sessionid,
Joy Lattenab5f5e82007-09-17 11:51:22 -0700715 audit_info->secid);
Joy Latten4aa2e622007-06-04 19:05:57 -0400716 return err;
717 }
718 }
719 }
720 }
721 return err;
722}
723#else
724static inline int
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800725xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
Joy Latten4aa2e622007-06-04 19:05:57 -0400726{
727 return 0;
728}
729#endif
730
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800731int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
Joy Latten4aa2e622007-06-04 19:05:57 -0400732{
Jamal Hadi Salim2f1eb652010-02-19 02:00:42 +0000733 int dir, err = 0, cnt = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
735 write_lock_bh(&xfrm_policy_lock);
Joy Latten4aa2e622007-06-04 19:05:57 -0400736
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800737 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
Joy Latten4aa2e622007-06-04 19:05:57 -0400738 if (err)
739 goto out;
740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700742 struct xfrm_policy *pol;
743 struct hlist_node *entry;
Wei Yongjun29fa0b302008-12-03 00:33:09 -0800744 int i;
David S. Miller2518c7c2006-08-24 04:45:07 -0700745
746 again1:
747 hlist_for_each_entry(pol, entry,
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800748 &net->xfrm.policy_inexact[dir], bydst) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700749 if (pol->type != type)
750 continue;
Timo Teräsea2dea92010-03-31 00:17:05 +0000751 __xfrm_policy_unlink(pol, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 write_unlock_bh(&xfrm_policy_lock);
Timo Teräsea2dea92010-03-31 00:17:05 +0000753 cnt++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
Joy Lattenab5f5e82007-09-17 11:51:22 -0700755 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
Eric Paris25323862008-04-18 10:09:25 -0400756 audit_info->sessionid,
Joy Lattenab5f5e82007-09-17 11:51:22 -0700757 audit_info->secid);
Joy Latten161a09e2006-11-27 13:11:54 -0600758
David S. Miller2518c7c2006-08-24 04:45:07 -0700759 xfrm_policy_kill(pol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
761 write_lock_bh(&xfrm_policy_lock);
David S. Miller2518c7c2006-08-24 04:45:07 -0700762 goto again1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 }
David S. Miller2518c7c2006-08-24 04:45:07 -0700764
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800765 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700766 again2:
767 hlist_for_each_entry(pol, entry,
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800768 net->xfrm.policy_bydst[dir].table + i,
David S. Miller2518c7c2006-08-24 04:45:07 -0700769 bydst) {
770 if (pol->type != type)
771 continue;
Timo Teräsea2dea92010-03-31 00:17:05 +0000772 __xfrm_policy_unlink(pol, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700773 write_unlock_bh(&xfrm_policy_lock);
Timo Teräsea2dea92010-03-31 00:17:05 +0000774 cnt++;
David S. Miller2518c7c2006-08-24 04:45:07 -0700775
Joy Lattenab5f5e82007-09-17 11:51:22 -0700776 xfrm_audit_policy_delete(pol, 1,
777 audit_info->loginuid,
Eric Paris25323862008-04-18 10:09:25 -0400778 audit_info->sessionid,
Joy Lattenab5f5e82007-09-17 11:51:22 -0700779 audit_info->secid);
David S. Miller2518c7c2006-08-24 04:45:07 -0700780 xfrm_policy_kill(pol);
781
782 write_lock_bh(&xfrm_policy_lock);
783 goto again2;
784 }
785 }
786
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 }
Jamal Hadi Salim2f1eb652010-02-19 02:00:42 +0000788 if (!cnt)
789 err = -ESRCH;
Joy Latten4aa2e622007-06-04 19:05:57 -0400790out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 write_unlock_bh(&xfrm_policy_lock);
Joy Latten4aa2e622007-06-04 19:05:57 -0400792 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793}
794EXPORT_SYMBOL(xfrm_policy_flush);
795
Alexey Dobriyancdcbca72008-11-25 17:34:49 -0800796int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
Timo Teras4c563f72008-02-28 21:31:08 -0800797 int (*func)(struct xfrm_policy *, int, int, void*),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 void *data)
799{
Herbert Xu12a169e2008-10-01 07:03:24 -0700800 struct xfrm_policy *pol;
801 struct xfrm_policy_walk_entry *x;
Timo Teras4c563f72008-02-28 21:31:08 -0800802 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
Timo Teras4c563f72008-02-28 21:31:08 -0800804 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
805 walk->type != XFRM_POLICY_TYPE_ANY)
806 return -EINVAL;
807
Herbert Xu12a169e2008-10-01 07:03:24 -0700808 if (list_empty(&walk->walk.all) && walk->seq != 0)
Timo Teras4c563f72008-02-28 21:31:08 -0800809 return 0;
810
Herbert Xu12a169e2008-10-01 07:03:24 -0700811 write_lock_bh(&xfrm_policy_lock);
812 if (list_empty(&walk->walk.all))
Alexey Dobriyancdcbca72008-11-25 17:34:49 -0800813 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
Herbert Xu12a169e2008-10-01 07:03:24 -0700814 else
815 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
Alexey Dobriyancdcbca72008-11-25 17:34:49 -0800816 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
Herbert Xu12a169e2008-10-01 07:03:24 -0700817 if (x->dead)
Timo Teras4c563f72008-02-28 21:31:08 -0800818 continue;
Herbert Xu12a169e2008-10-01 07:03:24 -0700819 pol = container_of(x, struct xfrm_policy, walk);
820 if (walk->type != XFRM_POLICY_TYPE_ANY &&
821 walk->type != pol->type)
822 continue;
823 error = func(pol, xfrm_policy_id2dir(pol->index),
824 walk->seq, data);
825 if (error) {
826 list_move_tail(&walk->walk.all, &x->all);
827 goto out;
Timo Teras4c563f72008-02-28 21:31:08 -0800828 }
Herbert Xu12a169e2008-10-01 07:03:24 -0700829 walk->seq++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 }
Herbert Xu12a169e2008-10-01 07:03:24 -0700831 if (walk->seq == 0) {
Jamal Hadi Salimbaf5d742006-12-04 20:02:37 -0800832 error = -ENOENT;
833 goto out;
834 }
Herbert Xu12a169e2008-10-01 07:03:24 -0700835 list_del_init(&walk->walk.all);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836out:
Herbert Xu12a169e2008-10-01 07:03:24 -0700837 write_unlock_bh(&xfrm_policy_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 return error;
839}
840EXPORT_SYMBOL(xfrm_policy_walk);
841
Herbert Xu12a169e2008-10-01 07:03:24 -0700842void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
843{
844 INIT_LIST_HEAD(&walk->walk.all);
845 walk->walk.dead = 1;
846 walk->type = type;
847 walk->seq = 0;
848}
849EXPORT_SYMBOL(xfrm_policy_walk_init);
850
851void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
852{
853 if (list_empty(&walk->walk.all))
854 return;
855
856 write_lock_bh(&xfrm_policy_lock);
857 list_del(&walk->walk.all);
858 write_unlock_bh(&xfrm_policy_lock);
859}
860EXPORT_SYMBOL(xfrm_policy_walk_done);
861
James Morris134b0fc2006-10-05 15:42:27 -0500862/*
863 * Find policy to apply to this flow.
864 *
865 * Returns 0 if policy found, else an -errno.
866 */
David S. Miller2518c7c2006-08-24 04:45:07 -0700867static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
868 u8 type, u16 family, int dir)
869{
870 struct xfrm_selector *sel = &pol->selector;
James Morris134b0fc2006-10-05 15:42:27 -0500871 int match, ret = -ESRCH;
David S. Miller2518c7c2006-08-24 04:45:07 -0700872
873 if (pol->family != family ||
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +0000874 (fl->mark & pol->mark.m) != pol->mark.v ||
David S. Miller2518c7c2006-08-24 04:45:07 -0700875 pol->type != type)
James Morris134b0fc2006-10-05 15:42:27 -0500876 return ret;
David S. Miller2518c7c2006-08-24 04:45:07 -0700877
878 match = xfrm_selector_match(sel, fl, family);
James Morris134b0fc2006-10-05 15:42:27 -0500879 if (match)
Paul Moore03e1ad72008-04-12 19:07:52 -0700880 ret = security_xfrm_policy_lookup(pol->security, fl->secid,
881 dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700882
James Morris134b0fc2006-10-05 15:42:27 -0500883 return ret;
David S. Miller2518c7c2006-08-24 04:45:07 -0700884}
885
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800886static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
887 struct flowi *fl,
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700888 u16 family, u8 dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889{
James Morris134b0fc2006-10-05 15:42:27 -0500890 int err;
David S. Miller2518c7c2006-08-24 04:45:07 -0700891 struct xfrm_policy *pol, *ret;
892 xfrm_address_t *daddr, *saddr;
893 struct hlist_node *entry;
894 struct hlist_head *chain;
David S. Milleracba48e2006-08-25 15:46:46 -0700895 u32 priority = ~0U;
David S. Miller2518c7c2006-08-24 04:45:07 -0700896
897 daddr = xfrm_flowi_daddr(fl, family);
898 saddr = xfrm_flowi_saddr(fl, family);
899 if (unlikely(!daddr || !saddr))
900 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
902 read_lock_bh(&xfrm_policy_lock);
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800903 chain = policy_hash_direct(net, daddr, saddr, family, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700904 ret = NULL;
905 hlist_for_each_entry(pol, entry, chain, bydst) {
James Morris134b0fc2006-10-05 15:42:27 -0500906 err = xfrm_policy_match(pol, fl, type, family, dir);
907 if (err) {
908 if (err == -ESRCH)
909 continue;
910 else {
911 ret = ERR_PTR(err);
912 goto fail;
913 }
914 } else {
David S. Milleracba48e2006-08-25 15:46:46 -0700915 ret = pol;
916 priority = ret->priority;
917 break;
918 }
919 }
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800920 chain = &net->xfrm.policy_inexact[dir];
David S. Milleracba48e2006-08-25 15:46:46 -0700921 hlist_for_each_entry(pol, entry, chain, bydst) {
James Morris134b0fc2006-10-05 15:42:27 -0500922 err = xfrm_policy_match(pol, fl, type, family, dir);
923 if (err) {
924 if (err == -ESRCH)
925 continue;
926 else {
927 ret = ERR_PTR(err);
928 goto fail;
929 }
930 } else if (pol->priority < priority) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700931 ret = pol;
932 break;
933 }
934 }
David S. Milleracba48e2006-08-25 15:46:46 -0700935 if (ret)
936 xfrm_pol_hold(ret);
James Morris134b0fc2006-10-05 15:42:27 -0500937fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 read_unlock_bh(&xfrm_policy_lock);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700939
David S. Miller2518c7c2006-08-24 04:45:07 -0700940 return ret;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700941}
942
Timo Teräs80c802f2010-04-07 00:30:05 +0000943static struct xfrm_policy *
944__xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir)
945{
946#ifdef CONFIG_XFRM_SUB_POLICY
947 struct xfrm_policy *pol;
948
949 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
950 if (pol != NULL)
951 return pol;
952#endif
953 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
954}
955
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000956static struct flow_cache_object *
957xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family,
958 u8 dir, struct flow_cache_object *old_obj, void *ctx)
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700959{
960 struct xfrm_policy *pol;
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000961
962 if (old_obj)
963 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700964
Timo Teräs80c802f2010-04-07 00:30:05 +0000965 pol = __xfrm_policy_lookup(net, fl, family, dir);
966 if (IS_ERR_OR_NULL(pol))
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000967 return ERR_CAST(pol);
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000968
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000969 /* Resolver returns two references:
970 * one for cache and one for caller of flow_cache_lookup() */
971 xfrm_pol_hold(pol);
972
973 return &pol->flo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974}
975
Trent Jaegerdf718372005-12-13 23:12:27 -0800976static inline int policy_to_flow_dir(int dir)
977{
978 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900979 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
980 XFRM_POLICY_FWD == FLOW_DIR_FWD)
981 return dir;
982 switch (dir) {
983 default:
984 case XFRM_POLICY_IN:
985 return FLOW_DIR_IN;
986 case XFRM_POLICY_OUT:
987 return FLOW_DIR_OUT;
988 case XFRM_POLICY_FWD:
989 return FLOW_DIR_FWD;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700990 }
Trent Jaegerdf718372005-12-13 23:12:27 -0800991}
992
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -0700993static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994{
995 struct xfrm_policy *pol;
996
997 read_lock_bh(&xfrm_policy_lock);
998 if ((pol = sk->sk_policy[dir]) != NULL) {
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900999 int match = xfrm_selector_match(&pol->selector, fl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 sk->sk_family);
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09001001 int err = 0;
Trent Jaegerdf718372005-12-13 23:12:27 -08001002
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05001003 if (match) {
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +00001004 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1005 pol = NULL;
1006 goto out;
1007 }
Paul Moore03e1ad72008-04-12 19:07:52 -07001008 err = security_xfrm_policy_lookup(pol->security,
1009 fl->secid,
1010 policy_to_flow_dir(dir));
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05001011 if (!err)
1012 xfrm_pol_hold(pol);
1013 else if (err == -ESRCH)
1014 pol = NULL;
1015 else
1016 pol = ERR_PTR(err);
1017 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 pol = NULL;
1019 }
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +00001020out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 read_unlock_bh(&xfrm_policy_lock);
1022 return pol;
1023}
1024
1025static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1026{
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001027 struct net *net = xp_net(pol);
Alexey Dobriyan11219942008-11-25 17:33:06 -08001028 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
David S. Miller2518c7c2006-08-24 04:45:07 -07001029 pol->family, dir);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001030
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001031 list_add(&pol->walk.all, &net->xfrm.policy_all);
David S. Miller2518c7c2006-08-24 04:45:07 -07001032 hlist_add_head(&pol->bydst, chain);
Alexey Dobriyane92303f2008-11-25 17:32:41 -08001033 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001034 net->xfrm.policy_count[dir]++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 xfrm_pol_hold(pol);
David S. Miller2518c7c2006-08-24 04:45:07 -07001036
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001037 if (xfrm_bydst_should_resize(net, dir, NULL))
1038 schedule_work(&net->xfrm.policy_hash_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039}
1040
1041static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1042 int dir)
1043{
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001044 struct net *net = xp_net(pol);
1045
David S. Miller2518c7c2006-08-24 04:45:07 -07001046 if (hlist_unhashed(&pol->bydst))
1047 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048
David S. Miller2518c7c2006-08-24 04:45:07 -07001049 hlist_del(&pol->bydst);
1050 hlist_del(&pol->byidx);
Herbert Xu12a169e2008-10-01 07:03:24 -07001051 list_del(&pol->walk.all);
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001052 net->xfrm.policy_count[dir]--;
David S. Miller2518c7c2006-08-24 04:45:07 -07001053
1054 return pol;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055}
1056
Herbert Xu4666faa2005-06-18 22:43:22 -07001057int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058{
1059 write_lock_bh(&xfrm_policy_lock);
1060 pol = __xfrm_policy_unlink(pol, dir);
1061 write_unlock_bh(&xfrm_policy_lock);
1062 if (pol) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 xfrm_policy_kill(pol);
Herbert Xu4666faa2005-06-18 22:43:22 -07001064 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 }
Herbert Xu4666faa2005-06-18 22:43:22 -07001066 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067}
David S. Millera70fcb02006-03-20 19:18:52 -08001068EXPORT_SYMBOL(xfrm_policy_delete);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069
1070int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1071{
Alexey Dobriyan11219942008-11-25 17:33:06 -08001072 struct net *net = xp_net(pol);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 struct xfrm_policy *old_pol;
1074
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001075#ifdef CONFIG_XFRM_SUB_POLICY
1076 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1077 return -EINVAL;
1078#endif
1079
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 write_lock_bh(&xfrm_policy_lock);
1081 old_pol = sk->sk_policy[dir];
1082 sk->sk_policy[dir] = pol;
1083 if (pol) {
James Morris9d729f72007-03-04 16:12:44 -08001084 pol->curlft.add_time = get_seconds();
Alexey Dobriyan11219942008-11-25 17:33:06 -08001085 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1087 }
1088 if (old_pol)
Timo Teräsea2dea92010-03-31 00:17:05 +00001089 /* Unlinking succeeds always. This is the only function
1090 * allowed to delete or replace socket policy.
1091 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1093 write_unlock_bh(&xfrm_policy_lock);
1094
1095 if (old_pol) {
1096 xfrm_policy_kill(old_pol);
1097 }
1098 return 0;
1099}
1100
1101static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1102{
Alexey Dobriyan0331b1f2008-11-25 17:21:45 -08001103 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104
1105 if (newp) {
1106 newp->selector = old->selector;
Paul Moore03e1ad72008-04-12 19:07:52 -07001107 if (security_xfrm_policy_clone(old->security,
1108 &newp->security)) {
Trent Jaegerdf718372005-12-13 23:12:27 -08001109 kfree(newp);
1110 return NULL; /* ENOMEM */
1111 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 newp->lft = old->lft;
1113 newp->curlft = old->curlft;
Jamal Hadi Salimfb977e22010-02-23 15:09:53 -08001114 newp->mark = old->mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 newp->action = old->action;
1116 newp->flags = old->flags;
1117 newp->xfrm_nr = old->xfrm_nr;
1118 newp->index = old->index;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001119 newp->type = old->type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 memcpy(newp->xfrm_vec, old->xfrm_vec,
1121 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1122 write_lock_bh(&xfrm_policy_lock);
1123 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1124 write_unlock_bh(&xfrm_policy_lock);
1125 xfrm_pol_put(newp);
1126 }
1127 return newp;
1128}
1129
1130int __xfrm_sk_clone_policy(struct sock *sk)
1131{
1132 struct xfrm_policy *p0 = sk->sk_policy[0],
1133 *p1 = sk->sk_policy[1];
1134
1135 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1136 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1137 return -ENOMEM;
1138 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1139 return -ENOMEM;
1140 return 0;
1141}
1142
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001143static int
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -08001144xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001145 unsigned short family)
1146{
1147 int err;
1148 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1149
1150 if (unlikely(afinfo == NULL))
1151 return -EINVAL;
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -08001152 err = afinfo->get_saddr(net, local, remote);
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001153 xfrm_policy_put_afinfo(afinfo);
1154 return err;
1155}
1156
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157/* Resolve list of templates for the flow, given policy. */
1158
1159static int
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001160xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1161 struct xfrm_state **xfrm,
1162 unsigned short family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163{
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -08001164 struct net *net = xp_net(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 int nx;
1166 int i, error;
1167 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1168 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001169 xfrm_address_t tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170
1171 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1172 struct xfrm_state *x;
1173 xfrm_address_t *remote = daddr;
1174 xfrm_address_t *local = saddr;
1175 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1176
Joakim Koskela48b8d782007-07-26 00:08:42 -07001177 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1178 tmpl->mode == XFRM_MODE_BEET) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 remote = &tmpl->id.daddr;
1180 local = &tmpl->saddr;
Thomas Egerer8444cf72010-09-20 11:11:38 -07001181 if (xfrm_addr_any(local, tmpl->encap_family)) {
1182 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001183 if (error)
1184 goto fail;
1185 local = &tmp;
1186 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 }
1188
1189 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1190
1191 if (x && x->km.state == XFRM_STATE_VALID) {
1192 xfrm[nx++] = x;
1193 daddr = remote;
1194 saddr = local;
1195 continue;
1196 }
1197 if (x) {
1198 error = (x->km.state == XFRM_STATE_ERROR ?
1199 -EINVAL : -EAGAIN);
1200 xfrm_state_put(x);
1201 }
fernando@oss.ntt.coa43222662008-10-23 04:27:19 +00001202 else if (error == -ESRCH)
1203 error = -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204
1205 if (!tmpl->optional)
1206 goto fail;
1207 }
1208 return nx;
1209
1210fail:
1211 for (nx--; nx>=0; nx--)
1212 xfrm_state_put(xfrm[nx]);
1213 return error;
1214}
1215
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001216static int
1217xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1218 struct xfrm_state **xfrm,
1219 unsigned short family)
1220{
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001221 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1222 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001223 int cnx = 0;
1224 int error;
1225 int ret;
1226 int i;
1227
1228 for (i = 0; i < npols; i++) {
1229 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1230 error = -ENOBUFS;
1231 goto fail;
1232 }
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001233
1234 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001235 if (ret < 0) {
1236 error = ret;
1237 goto fail;
1238 } else
1239 cnx += ret;
1240 }
1241
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001242 /* found states are sorted for outbound processing */
1243 if (npols > 1)
1244 xfrm_state_sort(xfrm, tpp, cnx, family);
1245
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001246 return cnx;
1247
1248 fail:
1249 for (cnx--; cnx>=0; cnx--)
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001250 xfrm_state_put(tpp[cnx]);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001251 return error;
1252
1253}
1254
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255/* Check that the bundle accepts the flow and its components are
1256 * still valid.
1257 */
1258
Herbert Xu25ee3282007-12-11 09:32:34 -08001259static inline int xfrm_get_tos(struct flowi *fl, int family)
1260{
1261 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1262 int tos;
1263
1264 if (!afinfo)
1265 return -EINVAL;
1266
1267 tos = afinfo->get_tos(fl);
1268
1269 xfrm_policy_put_afinfo(afinfo);
1270
1271 return tos;
1272}
1273
Timo Teräs80c802f2010-04-07 00:30:05 +00001274static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1275{
1276 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1277 struct dst_entry *dst = &xdst->u.dst;
1278
1279 if (xdst->route == NULL) {
1280 /* Dummy bundle - if it has xfrms we were not
1281 * able to build bundle as template resolution failed.
1282 * It means we need to try again resolving. */
1283 if (xdst->num_xfrms > 0)
1284 return NULL;
1285 } else {
1286 /* Real bundle */
1287 if (stale_bundle(dst))
1288 return NULL;
1289 }
1290
1291 dst_hold(dst);
1292 return flo;
1293}
1294
1295static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1296{
1297 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1298 struct dst_entry *dst = &xdst->u.dst;
1299
1300 if (!xdst->route)
1301 return 0;
1302 if (stale_bundle(dst))
1303 return 0;
1304
1305 return 1;
1306}
1307
1308static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1309{
1310 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1311 struct dst_entry *dst = &xdst->u.dst;
1312
1313 dst_free(dst);
1314}
1315
1316static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1317 .get = xfrm_bundle_flo_get,
1318 .check = xfrm_bundle_flo_check,
1319 .delete = xfrm_bundle_flo_delete,
1320};
1321
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001322static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
Herbert Xu25ee3282007-12-11 09:32:34 -08001323{
1324 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001325 struct dst_ops *dst_ops;
Herbert Xu25ee3282007-12-11 09:32:34 -08001326 struct xfrm_dst *xdst;
1327
1328 if (!afinfo)
1329 return ERR_PTR(-EINVAL);
1330
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001331 switch (family) {
1332 case AF_INET:
1333 dst_ops = &net->xfrm.xfrm4_dst_ops;
1334 break;
1335#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1336 case AF_INET6:
1337 dst_ops = &net->xfrm.xfrm6_dst_ops;
1338 break;
1339#endif
1340 default:
1341 BUG();
1342 }
1343 xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS);
Herbert Xu25ee3282007-12-11 09:32:34 -08001344 xfrm_policy_put_afinfo(afinfo);
1345
Timo Teräs80c802f2010-04-07 00:30:05 +00001346 xdst->flo.ops = &xfrm_bundle_fc_ops;
1347
Herbert Xu25ee3282007-12-11 09:32:34 -08001348 return xdst;
1349}
1350
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001351static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1352 int nfheader_len)
1353{
1354 struct xfrm_policy_afinfo *afinfo =
1355 xfrm_policy_get_afinfo(dst->ops->family);
1356 int err;
1357
1358 if (!afinfo)
1359 return -EINVAL;
1360
1361 err = afinfo->init_path(path, dst, nfheader_len);
1362
1363 xfrm_policy_put_afinfo(afinfo);
1364
1365 return err;
1366}
1367
Herbert Xu87c1e122010-03-02 02:51:56 +00001368static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1369 struct flowi *fl)
Herbert Xu25ee3282007-12-11 09:32:34 -08001370{
1371 struct xfrm_policy_afinfo *afinfo =
1372 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1373 int err;
1374
1375 if (!afinfo)
1376 return -EINVAL;
1377
Herbert Xu87c1e122010-03-02 02:51:56 +00001378 err = afinfo->fill_dst(xdst, dev, fl);
Herbert Xu25ee3282007-12-11 09:32:34 -08001379
1380 xfrm_policy_put_afinfo(afinfo);
1381
1382 return err;
1383}
1384
Timo Teräs80c802f2010-04-07 00:30:05 +00001385
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386/* Allocate chain of dst_entry's, attach known xfrm's, calculate
1387 * all the metrics... Shortly, bundle a bundle.
1388 */
1389
Herbert Xu25ee3282007-12-11 09:32:34 -08001390static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1391 struct xfrm_state **xfrm, int nx,
1392 struct flowi *fl,
1393 struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394{
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001395 struct net *net = xp_net(policy);
Herbert Xu25ee3282007-12-11 09:32:34 -08001396 unsigned long now = jiffies;
1397 struct net_device *dev;
1398 struct dst_entry *dst_prev = NULL;
1399 struct dst_entry *dst0 = NULL;
1400 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 int err;
Herbert Xu25ee3282007-12-11 09:32:34 -08001402 int header_len = 0;
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001403 int nfheader_len = 0;
Herbert Xu25ee3282007-12-11 09:32:34 -08001404 int trailer_len = 0;
1405 int tos;
1406 int family = policy->selector.family;
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +09001407 xfrm_address_t saddr, daddr;
1408
1409 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
Herbert Xu25ee3282007-12-11 09:32:34 -08001410
1411 tos = xfrm_get_tos(fl, family);
1412 err = tos;
1413 if (tos < 0)
1414 goto put_states;
1415
1416 dst_hold(dst);
1417
1418 for (; i < nx; i++) {
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001419 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
Herbert Xu25ee3282007-12-11 09:32:34 -08001420 struct dst_entry *dst1 = &xdst->u.dst;
1421
1422 err = PTR_ERR(xdst);
1423 if (IS_ERR(xdst)) {
1424 dst_release(dst);
1425 goto put_states;
1426 }
1427
1428 if (!dst_prev)
1429 dst0 = dst1;
1430 else {
1431 dst_prev->child = dst_clone(dst1);
1432 dst1->flags |= DST_NOHASH;
1433 }
1434
1435 xdst->route = dst;
1436 memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics));
1437
1438 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1439 family = xfrm[i]->props.family;
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +09001440 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1441 family);
Herbert Xu25ee3282007-12-11 09:32:34 -08001442 err = PTR_ERR(dst);
1443 if (IS_ERR(dst))
1444 goto put_states;
1445 } else
1446 dst_hold(dst);
1447
1448 dst1->xfrm = xfrm[i];
Timo Teräs80c802f2010-04-07 00:30:05 +00001449 xdst->xfrm_genid = xfrm[i]->genid;
Herbert Xu25ee3282007-12-11 09:32:34 -08001450
1451 dst1->obsolete = -1;
1452 dst1->flags |= DST_HOST;
1453 dst1->lastuse = now;
1454
1455 dst1->input = dst_discard;
1456 dst1->output = xfrm[i]->outer_mode->afinfo->output;
1457
1458 dst1->next = dst_prev;
1459 dst_prev = dst1;
1460
1461 header_len += xfrm[i]->props.header_len;
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001462 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1463 nfheader_len += xfrm[i]->props.header_len;
Herbert Xu25ee3282007-12-11 09:32:34 -08001464 trailer_len += xfrm[i]->props.trailer_len;
1465 }
1466
1467 dst_prev->child = dst;
1468 dst0->path = dst;
1469
1470 err = -ENODEV;
1471 dev = dst->dev;
1472 if (!dev)
1473 goto free_dst;
1474
Ralf Baechle96c53402009-12-25 23:30:02 +00001475 /* Copy neighbour for reachability confirmation */
Herbert Xu25ee3282007-12-11 09:32:34 -08001476 dst0->neighbour = neigh_clone(dst->neighbour);
1477
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001478 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
Herbert Xu25ee3282007-12-11 09:32:34 -08001479 xfrm_init_pmtu(dst_prev);
1480
1481 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1482 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1483
Herbert Xu87c1e122010-03-02 02:51:56 +00001484 err = xfrm_fill_dst(xdst, dev, fl);
Herbert Xu25ee3282007-12-11 09:32:34 -08001485 if (err)
1486 goto free_dst;
1487
1488 dst_prev->header_len = header_len;
1489 dst_prev->trailer_len = trailer_len;
1490 header_len -= xdst->u.dst.xfrm->props.header_len;
1491 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1492 }
1493
1494out:
1495 return dst0;
1496
1497put_states:
1498 for (; i < nx; i++)
1499 xfrm_state_put(xfrm[i]);
1500free_dst:
1501 if (dst0)
1502 dst_free(dst0);
1503 dst0 = ERR_PTR(err);
1504 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505}
1506
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -07001507static int inline
1508xfrm_dst_alloc_copy(void **target, void *src, int size)
1509{
1510 if (!*target) {
1511 *target = kmalloc(size, GFP_ATOMIC);
1512 if (!*target)
1513 return -ENOMEM;
1514 }
1515 memcpy(*target, src, size);
1516 return 0;
1517}
1518
1519static int inline
1520xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
1521{
1522#ifdef CONFIG_XFRM_SUB_POLICY
1523 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1524 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1525 sel, sizeof(*sel));
1526#else
1527 return 0;
1528#endif
1529}
1530
1531static int inline
1532xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
1533{
1534#ifdef CONFIG_XFRM_SUB_POLICY
1535 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1536 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1537#else
1538 return 0;
1539#endif
1540}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541
Timo Teräs80c802f2010-04-07 00:30:05 +00001542static int xfrm_expand_policies(struct flowi *fl, u16 family,
1543 struct xfrm_policy **pols,
1544 int *num_pols, int *num_xfrms)
1545{
1546 int i;
1547
1548 if (*num_pols == 0 || !pols[0]) {
1549 *num_pols = 0;
1550 *num_xfrms = 0;
1551 return 0;
1552 }
1553 if (IS_ERR(pols[0]))
1554 return PTR_ERR(pols[0]);
1555
1556 *num_xfrms = pols[0]->xfrm_nr;
1557
1558#ifdef CONFIG_XFRM_SUB_POLICY
1559 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1560 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1561 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1562 XFRM_POLICY_TYPE_MAIN,
1563 fl, family,
1564 XFRM_POLICY_OUT);
1565 if (pols[1]) {
1566 if (IS_ERR(pols[1])) {
1567 xfrm_pols_put(pols, *num_pols);
1568 return PTR_ERR(pols[1]);
1569 }
1570 (*num_pols) ++;
1571 (*num_xfrms) += pols[1]->xfrm_nr;
1572 }
1573 }
1574#endif
1575 for (i = 0; i < *num_pols; i++) {
1576 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1577 *num_xfrms = -1;
1578 break;
1579 }
1580 }
1581
1582 return 0;
1583
1584}
1585
1586static struct xfrm_dst *
1587xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1588 struct flowi *fl, u16 family,
1589 struct dst_entry *dst_orig)
1590{
1591 struct net *net = xp_net(pols[0]);
1592 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1593 struct dst_entry *dst;
1594 struct xfrm_dst *xdst;
1595 int err;
1596
1597 /* Try to instantiate a bundle */
1598 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
Timo Teräsd809ec82010-07-12 21:29:42 +00001599 if (err <= 0) {
1600 if (err != 0 && err != -EAGAIN)
Timo Teräs80c802f2010-04-07 00:30:05 +00001601 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1602 return ERR_PTR(err);
1603 }
1604
1605 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1606 if (IS_ERR(dst)) {
1607 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1608 return ERR_CAST(dst);
1609 }
1610
1611 xdst = (struct xfrm_dst *)dst;
1612 xdst->num_xfrms = err;
1613 if (num_pols > 1)
1614 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1615 else
1616 err = xfrm_dst_update_origin(dst, fl);
1617 if (unlikely(err)) {
1618 dst_free(dst);
1619 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1620 return ERR_PTR(err);
1621 }
1622
1623 xdst->num_pols = num_pols;
1624 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1625 xdst->policy_genid = atomic_read(&pols[0]->genid);
1626
1627 return xdst;
1628}
1629
1630static struct flow_cache_object *
1631xfrm_bundle_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir,
1632 struct flow_cache_object *oldflo, void *ctx)
1633{
1634 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1635 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1636 struct xfrm_dst *xdst, *new_xdst;
1637 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1638
1639 /* Check if the policies from old bundle are usable */
1640 xdst = NULL;
1641 if (oldflo) {
1642 xdst = container_of(oldflo, struct xfrm_dst, flo);
1643 num_pols = xdst->num_pols;
1644 num_xfrms = xdst->num_xfrms;
1645 pol_dead = 0;
1646 for (i = 0; i < num_pols; i++) {
1647 pols[i] = xdst->pols[i];
1648 pol_dead |= pols[i]->walk.dead;
1649 }
1650 if (pol_dead) {
1651 dst_free(&xdst->u.dst);
1652 xdst = NULL;
1653 num_pols = 0;
1654 num_xfrms = 0;
1655 oldflo = NULL;
1656 }
1657 }
1658
1659 /* Resolve policies to use if we couldn't get them from
1660 * previous cache entry */
1661 if (xdst == NULL) {
1662 num_pols = 1;
1663 pols[0] = __xfrm_policy_lookup(net, fl, family, dir);
1664 err = xfrm_expand_policies(fl, family, pols,
1665 &num_pols, &num_xfrms);
1666 if (err < 0)
1667 goto inc_error;
1668 if (num_pols == 0)
1669 return NULL;
1670 if (num_xfrms <= 0)
1671 goto make_dummy_bundle;
1672 }
1673
1674 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1675 if (IS_ERR(new_xdst)) {
1676 err = PTR_ERR(new_xdst);
1677 if (err != -EAGAIN)
1678 goto error;
1679 if (oldflo == NULL)
1680 goto make_dummy_bundle;
1681 dst_hold(&xdst->u.dst);
1682 return oldflo;
Timo Teräsd809ec82010-07-12 21:29:42 +00001683 } else if (new_xdst == NULL) {
1684 num_xfrms = 0;
1685 if (oldflo == NULL)
1686 goto make_dummy_bundle;
1687 xdst->num_xfrms = 0;
1688 dst_hold(&xdst->u.dst);
1689 return oldflo;
Timo Teräs80c802f2010-04-07 00:30:05 +00001690 }
1691
1692 /* Kill the previous bundle */
1693 if (xdst) {
1694 /* The policies were stolen for newly generated bundle */
1695 xdst->num_pols = 0;
1696 dst_free(&xdst->u.dst);
1697 }
1698
1699 /* Flow cache does not have reference, it dst_free()'s,
1700 * but we do need to return one reference for original caller */
1701 dst_hold(&new_xdst->u.dst);
1702 return &new_xdst->flo;
1703
1704make_dummy_bundle:
1705 /* We found policies, but there's no bundles to instantiate:
1706 * either because the policy blocks, has no transformations or
1707 * we could not build template (no xfrm_states).*/
1708 xdst = xfrm_alloc_dst(net, family);
1709 if (IS_ERR(xdst)) {
1710 xfrm_pols_put(pols, num_pols);
1711 return ERR_CAST(xdst);
1712 }
1713 xdst->num_pols = num_pols;
1714 xdst->num_xfrms = num_xfrms;
1715 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1716
1717 dst_hold(&xdst->u.dst);
1718 return &xdst->flo;
1719
1720inc_error:
1721 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1722error:
1723 if (xdst != NULL)
1724 dst_free(&xdst->u.dst);
1725 else
1726 xfrm_pols_put(pols, num_pols);
1727 return ERR_PTR(err);
1728}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729
1730/* Main function: finds/creates a bundle for given flow.
1731 *
1732 * At the moment we eat a raw IP route. Mostly to speed up lookups
1733 * on interfaces with disabled IPsec.
1734 */
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001735int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
David S. Miller14e50e52007-05-24 18:17:54 -07001736 struct sock *sk, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737{
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001738 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
Timo Teräs80c802f2010-04-07 00:30:05 +00001739 struct flow_cache_object *flo;
1740 struct xfrm_dst *xdst;
1741 struct dst_entry *dst, *dst_orig = *dst_p, *route;
1742 u16 family = dst_orig->ops->family;
Trent Jaegerdf718372005-12-13 23:12:27 -08001743 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
Changli Gao4b021622010-04-27 21:20:22 +00001744 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07001745
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746restart:
Timo Teräs80c802f2010-04-07 00:30:05 +00001747 dst = NULL;
1748 xdst = NULL;
1749 route = NULL;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001750
Thomas Graff7944fb2007-08-25 13:46:55 -07001751 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
Timo Teräs80c802f2010-04-07 00:30:05 +00001752 num_pols = 1;
1753 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1754 err = xfrm_expand_policies(fl, family, pols,
1755 &num_pols, &num_xfrms);
1756 if (err < 0)
Herbert Xu75b8c132007-12-11 04:38:08 -08001757 goto dropdst;
Timo Teräs80c802f2010-04-07 00:30:05 +00001758
1759 if (num_pols) {
1760 if (num_xfrms <= 0) {
1761 drop_pols = num_pols;
1762 goto no_transform;
1763 }
1764
1765 xdst = xfrm_resolve_and_create_bundle(
1766 pols, num_pols, fl,
1767 family, dst_orig);
1768 if (IS_ERR(xdst)) {
1769 xfrm_pols_put(pols, num_pols);
1770 err = PTR_ERR(xdst);
1771 goto dropdst;
Timo Teräsd809ec82010-07-12 21:29:42 +00001772 } else if (xdst == NULL) {
1773 num_xfrms = 0;
1774 drop_pols = num_pols;
1775 goto no_transform;
Timo Teräs80c802f2010-04-07 00:30:05 +00001776 }
1777
1778 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
1779 xdst->u.dst.next = xfrm_policy_sk_bundles;
1780 xfrm_policy_sk_bundles = &xdst->u.dst;
1781 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
1782
1783 route = xdst->route;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08001784 }
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05001785 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786
Timo Teräs80c802f2010-04-07 00:30:05 +00001787 if (xdst == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 /* To accelerate a bit... */
David S. Miller2518c7c2006-08-24 04:45:07 -07001789 if ((dst_orig->flags & DST_NOXFRM) ||
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001790 !net->xfrm.policy_count[XFRM_POLICY_OUT])
Herbert Xu8b7817f2007-12-12 10:44:43 -08001791 goto nopol;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792
Timo Teräs80c802f2010-04-07 00:30:05 +00001793 flo = flow_cache_lookup(net, fl, family, dir,
1794 xfrm_bundle_lookup, dst_orig);
1795 if (flo == NULL)
1796 goto nopol;
Timo Teräsfe1a5f02010-04-07 00:30:04 +00001797 if (IS_ERR(flo)) {
Timo Teräs80c802f2010-04-07 00:30:05 +00001798 err = PTR_ERR(flo);
Herbert Xu75b8c132007-12-11 04:38:08 -08001799 goto dropdst;
Masahide NAKAMURAd66e37a2008-01-07 21:46:15 -08001800 }
Timo Teräs80c802f2010-04-07 00:30:05 +00001801 xdst = container_of(flo, struct xfrm_dst, flo);
1802
1803 num_pols = xdst->num_pols;
1804 num_xfrms = xdst->num_xfrms;
1805 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols);
1806 route = xdst->route;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807 }
1808
Timo Teräs80c802f2010-04-07 00:30:05 +00001809 dst = &xdst->u.dst;
1810 if (route == NULL && num_xfrms > 0) {
1811 /* The only case when xfrm_bundle_lookup() returns a
1812 * bundle with null route, is when the template could
1813 * not be resolved. It means policies are there, but
1814 * bundle could not be created, since we don't yet
1815 * have the xfrm_state's. We need to wait for KM to
1816 * negotiate new SA's or bail out with error.*/
1817 if (net->xfrm.sysctl_larval_drop) {
1818 /* EREMOTE tells the caller to generate
1819 * a one-shot blackhole route. */
1820 dst_release(dst);
Timo Terasa1aa3482010-05-15 23:49:26 -07001821 xfrm_pols_put(pols, drop_pols);
Timo Teräs80c802f2010-04-07 00:30:05 +00001822 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1823 return -EREMOTE;
1824 }
1825 if (flags & XFRM_LOOKUP_WAIT) {
1826 DECLARE_WAITQUEUE(wait, current);
1827
1828 add_wait_queue(&net->xfrm.km_waitq, &wait);
1829 set_current_state(TASK_INTERRUPTIBLE);
1830 schedule();
1831 set_current_state(TASK_RUNNING);
1832 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1833
1834 if (!signal_pending(current)) {
1835 dst_release(dst);
1836 goto restart;
1837 }
1838
1839 err = -ERESTART;
1840 } else
1841 err = -EAGAIN;
1842
1843 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1844 goto error;
1845 }
1846
1847no_transform:
1848 if (num_pols == 0)
Herbert Xu8b7817f2007-12-12 10:44:43 -08001849 goto nopol;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850
Timo Teräs80c802f2010-04-07 00:30:05 +00001851 if ((flags & XFRM_LOOKUP_ICMP) &&
1852 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
1853 err = -ENOENT;
Herbert Xu8b7817f2007-12-12 10:44:43 -08001854 goto error;
Timo Teräs80c802f2010-04-07 00:30:05 +00001855 }
Herbert Xu8b7817f2007-12-12 10:44:43 -08001856
Timo Teräs80c802f2010-04-07 00:30:05 +00001857 for (i = 0; i < num_pols; i++)
1858 pols[i]->curlft.use_time = get_seconds();
Herbert Xu8b7817f2007-12-12 10:44:43 -08001859
Timo Teräs80c802f2010-04-07 00:30:05 +00001860 if (num_xfrms < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861 /* Prohibit the flow */
Alexey Dobriyan59c99402008-11-25 17:59:52 -08001862 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
Patrick McHardye104411b2005-09-08 15:11:55 -07001863 err = -EPERM;
1864 goto error;
Timo Teräs80c802f2010-04-07 00:30:05 +00001865 } else if (num_xfrms > 0) {
1866 /* Flow transformed */
1867 *dst_p = dst;
1868 dst_release(dst_orig);
1869 } else {
1870 /* Flow passes untransformed */
1871 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 }
Timo Teräs80c802f2010-04-07 00:30:05 +00001873ok:
1874 xfrm_pols_put(pols, drop_pols);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 return 0;
1876
Timo Teräs80c802f2010-04-07 00:30:05 +00001877nopol:
1878 if (!(flags & XFRM_LOOKUP_ICMP))
1879 goto ok;
1880 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881error:
Timo Teräs80c802f2010-04-07 00:30:05 +00001882 dst_release(dst);
Herbert Xu75b8c132007-12-11 04:38:08 -08001883dropdst:
1884 dst_release(dst_orig);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 *dst_p = NULL;
Timo Teräs80c802f2010-04-07 00:30:05 +00001886 xfrm_pols_put(pols, drop_pols);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 return err;
1888}
David S. Miller14e50e52007-05-24 18:17:54 -07001889EXPORT_SYMBOL(__xfrm_lookup);
1890
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001891int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
David S. Miller14e50e52007-05-24 18:17:54 -07001892 struct sock *sk, int flags)
1893{
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001894 int err = __xfrm_lookup(net, dst_p, fl, sk, flags);
David S. Miller14e50e52007-05-24 18:17:54 -07001895
1896 if (err == -EREMOTE) {
1897 dst_release(*dst_p);
1898 *dst_p = NULL;
1899 err = -EAGAIN;
1900 }
1901
1902 return err;
1903}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904EXPORT_SYMBOL(xfrm_lookup);
1905
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001906static inline int
1907xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1908{
1909 struct xfrm_state *x;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001910
1911 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1912 return 0;
1913 x = skb->sp->xvec[idx];
1914 if (!x->type->reject)
1915 return 0;
Herbert Xu1ecafed2007-10-09 13:24:07 -07001916 return x->type->reject(x, skb, fl);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001917}
1918
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919/* When skb is transformed back to its "native" form, we have to
1920 * check policy restrictions. At the moment we make this in maximally
1921 * stupid way. Shame on me. :-) Of course, connected sockets must
1922 * have policy cached at them.
1923 */
1924
1925static inline int
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09001926xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 unsigned short family)
1928{
1929 if (xfrm_state_kern(x))
Kazunori MIYAZAWA928ba412007-02-13 12:57:16 -08001930 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 return x->id.proto == tmpl->id.proto &&
1932 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1933 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1934 x->props.mode == tmpl->mode &&
Herbert Xuc5d18e92008-04-22 00:46:42 -07001935 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
Masahide NAKAMURAf3bd4842006-08-23 18:00:48 -07001936 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -07001937 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1938 xfrm_state_addr_cmp(tmpl, x, family));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939}
1940
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001941/*
1942 * 0 or more than 0 is returned when validation is succeeded (either bypass
1943 * because of optional transport mode, or next index of the mathced secpath
1944 * state with the template.
1945 * -1 is returned when no matching template is found.
1946 * Otherwise "-2 - errored_index" is returned.
1947 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948static inline int
1949xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1950 unsigned short family)
1951{
1952 int idx = start;
1953
1954 if (tmpl->optional) {
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -07001955 if (tmpl->mode == XFRM_MODE_TRANSPORT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956 return start;
1957 } else
1958 start = -1;
1959 for (; idx < sp->len; idx++) {
Herbert Xudbe5b4a2006-04-01 00:54:16 -08001960 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 return ++idx;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001962 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1963 if (start == -1)
1964 start = -2-idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965 break;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001966 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 }
1968 return start;
1969}
1970
Herbert Xud5422ef2007-12-12 10:44:16 -08001971int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1972 unsigned int family, int reverse)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973{
1974 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07001975 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976
1977 if (unlikely(afinfo == NULL))
1978 return -EAFNOSUPPORT;
1979
Herbert Xud5422ef2007-12-12 10:44:16 -08001980 afinfo->decode_session(skb, fl, reverse);
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001981 err = security_xfrm_decode_session(skb, &fl->secid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982 xfrm_policy_put_afinfo(afinfo);
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07001983 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984}
Herbert Xud5422ef2007-12-12 10:44:16 -08001985EXPORT_SYMBOL(__xfrm_decode_session);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001986
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001987static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988{
1989 for (; k < sp->len; k++) {
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001990 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
James Morrisd1d9fac2006-09-01 00:32:12 -07001991 *idxp = k;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992 return 1;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001993 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994 }
1995
1996 return 0;
1997}
1998
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09001999int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000 unsigned short family)
2001{
Alexey Dobriyanf6e1e252008-11-25 17:35:44 -08002002 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002003 struct xfrm_policy *pol;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002004 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2005 int npols = 0;
2006 int xfrm_nr;
2007 int pi;
Herbert Xud5422ef2007-12-12 10:44:16 -08002008 int reverse;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009 struct flowi fl;
Herbert Xud5422ef2007-12-12 10:44:16 -08002010 u8 fl_dir;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002011 int xerr_idx = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012
Herbert Xud5422ef2007-12-12 10:44:16 -08002013 reverse = dir & ~XFRM_POLICY_MASK;
2014 dir &= XFRM_POLICY_MASK;
2015 fl_dir = policy_to_flow_dir(dir);
2016
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002017 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002018 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002020 }
2021
Patrick McHardyeb9c7eb2006-01-06 23:06:30 -08002022 nf_nat_decode_session(skb, &fl, family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023
2024 /* First, check used SA against their selectors. */
2025 if (skb->sp) {
2026 int i;
2027
2028 for (i=skb->sp->len-1; i>=0; i--) {
Herbert Xudbe5b4a2006-04-01 00:54:16 -08002029 struct xfrm_state *x = skb->sp->xvec[i];
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002030 if (!xfrm_selector_match(&x->sel, &fl, family)) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002031 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002033 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034 }
2035 }
2036
2037 pol = NULL;
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05002038 if (sk && sk->sk_policy[dir]) {
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07002039 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002040 if (IS_ERR(pol)) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002041 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05002042 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002043 }
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05002044 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045
Timo Teräsfe1a5f02010-04-07 00:30:04 +00002046 if (!pol) {
2047 struct flow_cache_object *flo;
2048
2049 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2050 xfrm_policy_lookup, NULL);
2051 if (IS_ERR_OR_NULL(flo))
2052 pol = ERR_CAST(flo);
2053 else
2054 pol = container_of(flo, struct xfrm_policy, flo);
2055 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002057 if (IS_ERR(pol)) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002058 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
James Morris134b0fc2006-10-05 15:42:27 -05002059 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002060 }
James Morris134b0fc2006-10-05 15:42:27 -05002061
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002062 if (!pol) {
James Morrisd1d9fac2006-09-01 00:32:12 -07002063 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002064 xfrm_secpath_reject(xerr_idx, skb, &fl);
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002065 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002066 return 0;
2067 }
2068 return 1;
2069 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070
James Morris9d729f72007-03-04 16:12:44 -08002071 pol->curlft.use_time = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002073 pols[0] = pol;
2074 npols ++;
2075#ifdef CONFIG_XFRM_SUB_POLICY
2076 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
Alexey Dobriyanf6e1e252008-11-25 17:35:44 -08002077 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002078 &fl, family,
2079 XFRM_POLICY_IN);
2080 if (pols[1]) {
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002081 if (IS_ERR(pols[1])) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002082 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
James Morris134b0fc2006-10-05 15:42:27 -05002083 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002084 }
James Morris9d729f72007-03-04 16:12:44 -08002085 pols[1]->curlft.use_time = get_seconds();
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002086 npols ++;
2087 }
2088 }
2089#endif
2090
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091 if (pol->action == XFRM_POLICY_ALLOW) {
2092 struct sec_path *sp;
2093 static struct sec_path dummy;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002094 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07002095 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002096 struct xfrm_tmpl **tpp = tp;
2097 int ti = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098 int i, k;
2099
2100 if ((sp = skb->sp) == NULL)
2101 sp = &dummy;
2102
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002103 for (pi = 0; pi < npols; pi++) {
2104 if (pols[pi] != pol &&
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002105 pols[pi]->action != XFRM_POLICY_ALLOW) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002106 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002107 goto reject;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002108 }
2109 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002110 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002111 goto reject_error;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002112 }
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002113 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2114 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2115 }
2116 xfrm_nr = ti;
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07002117 if (npols > 1) {
2118 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2119 tpp = stp;
2120 }
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002121
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122 /* For each tunnel xfrm, find the first matching tmpl.
2123 * For each tmpl before that, find corresponding xfrm.
2124 * Order is _important_. Later we will implement
2125 * some barriers, but at the moment barriers
2126 * are implied between each two transformations.
2127 */
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002128 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2129 k = xfrm_policy_ok(tpp[i], sp, k, family);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002130 if (k < 0) {
James Morrisd1d9fac2006-09-01 00:32:12 -07002131 if (k < -1)
2132 /* "-2 - errored_index" returned */
2133 xerr_idx = -(2+k);
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002134 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135 goto reject;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002136 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002137 }
2138
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002139 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002140 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002141 goto reject;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002142 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002143
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002144 xfrm_pols_put(pols, npols);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 return 1;
2146 }
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002147 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002148
2149reject:
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002150 xfrm_secpath_reject(xerr_idx, skb, &fl);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002151reject_error:
2152 xfrm_pols_put(pols, npols);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002153 return 0;
2154}
2155EXPORT_SYMBOL(__xfrm_policy_check);
2156
2157int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2158{
Alexey Dobriyan99a66652008-11-25 17:36:13 -08002159 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160 struct flowi fl;
Eric Dumazetadf30902009-06-02 05:19:30 +00002161 struct dst_entry *dst;
2162 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002163
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002164 if (xfrm_decode_session(skb, &fl, family) < 0) {
jamal72032fd2010-02-18 03:35:07 +00002165 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002167 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168
Eric Dumazetfafeeb62010-06-01 10:04:49 +00002169 skb_dst_force(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +00002170 dst = skb_dst(skb);
2171
2172 res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0;
2173 skb_dst_set(skb, dst);
2174 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175}
2176EXPORT_SYMBOL(__xfrm_route_forward);
2177
David S. Millerd49c73c2006-08-13 18:55:53 -07002178/* Optimize later using cookies and generation ids. */
2179
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2181{
David S. Millerd49c73c2006-08-13 18:55:53 -07002182 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2183 * to "-1" to force all XFRM destinations to get validated by
2184 * dst_ops->check on every use. We do this because when a
2185 * normal route referenced by an XFRM dst is obsoleted we do
2186 * not go looking around for all parent referencing XFRM dsts
2187 * so that we can invalidate them. It is just too much work.
2188 * Instead we make the checks here on every use. For example:
2189 *
2190 * XFRM dst A --> IPv4 dst X
2191 *
2192 * X is the "xdst->route" of A (X is also the "dst->path" of A
2193 * in this example). If X is marked obsolete, "A" will not
2194 * notice. That's what we are validating here via the
2195 * stale_bundle() check.
2196 *
2197 * When a policy's bundle is pruned, we dst_free() the XFRM
2198 * dst which causes it's ->obsolete field to be set to a
2199 * positive non-zero integer. If an XFRM dst has been pruned
2200 * like this, we want to force a new route lookup.
David S. Miller399c1802005-12-19 14:23:23 -08002201 */
David S. Millerd49c73c2006-08-13 18:55:53 -07002202 if (dst->obsolete < 0 && !stale_bundle(dst))
2203 return dst;
2204
Linus Torvalds1da177e2005-04-16 15:20:36 -07002205 return NULL;
2206}
2207
2208static int stale_bundle(struct dst_entry *dst)
2209{
Venkat Yekkirala5b368e62006-10-05 15:42:18 -05002210 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002211}
2212
Herbert Xuaabc9762005-05-03 16:27:10 -07002213void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002215 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002216 dst->dev = dev_net(dev)->loopback_dev;
Daniel Lezcanode3cb742007-09-25 19:16:28 -07002217 dev_hold(dst->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002218 dev_put(dev);
2219 }
2220}
Herbert Xuaabc9762005-05-03 16:27:10 -07002221EXPORT_SYMBOL(xfrm_dst_ifdown);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222
2223static void xfrm_link_failure(struct sk_buff *skb)
2224{
2225 /* Impossible. Such dst must be popped before reaches point of failure. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002226}
2227
2228static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2229{
2230 if (dst) {
2231 if (dst->obsolete) {
2232 dst_release(dst);
2233 dst = NULL;
2234 }
2235 }
2236 return dst;
2237}
2238
Alexey Dobriyanddcfd792008-11-25 17:37:23 -08002239static void __xfrm_garbage_collect(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240{
Timo Teräs80c802f2010-04-07 00:30:05 +00002241 struct dst_entry *head, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242
Timo Teräs80c802f2010-04-07 00:30:05 +00002243 flow_cache_flush();
2244
2245 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
2246 head = xfrm_policy_sk_bundles;
2247 xfrm_policy_sk_bundles = NULL;
2248 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
2249
2250 while (head) {
2251 next = head->next;
2252 dst_free(head);
2253 head = next;
2254 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002255}
2256
Herbert Xu25ee3282007-12-11 09:32:34 -08002257static void xfrm_init_pmtu(struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002258{
2259 do {
2260 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2261 u32 pmtu, route_mtu_cached;
2262
2263 pmtu = dst_mtu(dst->child);
2264 xdst->child_mtu_cached = pmtu;
2265
2266 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2267
2268 route_mtu_cached = dst_mtu(xdst->route);
2269 xdst->route_mtu_cached = route_mtu_cached;
2270
2271 if (pmtu > route_mtu_cached)
2272 pmtu = route_mtu_cached;
2273
2274 dst->metrics[RTAX_MTU-1] = pmtu;
2275 } while ((dst = dst->next));
2276}
2277
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278/* Check that the bundle accepts the flow and its components are
2279 * still valid.
2280 */
2281
stephen hemminger1c4c40c2010-10-15 05:14:19 +00002282static int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
Venkat Yekkirala5b368e62006-10-05 15:42:18 -05002283 struct flowi *fl, int family, int strict)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002284{
2285 struct dst_entry *dst = &first->u.dst;
2286 struct xfrm_dst *last;
2287 u32 mtu;
2288
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -07002289 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290 (dst->dev && !netif_running(dst->dev)))
2291 return 0;
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -07002292#ifdef CONFIG_XFRM_SUB_POLICY
2293 if (fl) {
2294 if (first->origin && !flow_cache_uli_match(first->origin, fl))
2295 return 0;
2296 if (first->partner &&
2297 !xfrm_selector_match(first->partner, fl, family))
2298 return 0;
2299 }
2300#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002301
2302 last = NULL;
2303
2304 do {
2305 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2306
2307 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
2308 return 0;
Venkat Yekkirala67f83cb2006-11-08 17:04:26 -06002309 if (fl && pol &&
2310 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07002311 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002312 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2313 return 0;
Timo Teräs80c802f2010-04-07 00:30:05 +00002314 if (xdst->xfrm_genid != dst->xfrm->genid)
2315 return 0;
Timo Teräsb1312c82010-06-24 14:35:00 -07002316 if (xdst->num_pols > 0 &&
2317 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
David S. Miller9d4a7062006-08-24 03:18:09 -07002318 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319
Herbert Xu1bfcb102007-10-17 21:31:50 -07002320 if (strict && fl &&
Herbert Xu13996372007-10-17 21:35:51 -07002321 !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
Masahide NAKAMURAe53820d2006-08-23 19:12:01 -07002322 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
2323 return 0;
2324
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325 mtu = dst_mtu(dst->child);
2326 if (xdst->child_mtu_cached != mtu) {
2327 last = xdst;
2328 xdst->child_mtu_cached = mtu;
2329 }
2330
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -07002331 if (!dst_check(xdst->route, xdst->route_cookie))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002332 return 0;
2333 mtu = dst_mtu(xdst->route);
2334 if (xdst->route_mtu_cached != mtu) {
2335 last = xdst;
2336 xdst->route_mtu_cached = mtu;
2337 }
2338
2339 dst = dst->child;
2340 } while (dst->xfrm);
2341
2342 if (likely(!last))
2343 return 1;
2344
2345 mtu = last->child_mtu_cached;
2346 for (;;) {
2347 dst = &last->u.dst;
2348
2349 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2350 if (mtu > last->route_mtu_cached)
2351 mtu = last->route_mtu_cached;
2352 dst->metrics[RTAX_MTU-1] = mtu;
2353
2354 if (last == first)
2355 break;
2356
Patrick McHardybd0bf072007-07-18 01:55:52 -07002357 last = (struct xfrm_dst *)last->u.dst.next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002358 last->child_mtu_cached = mtu;
2359 }
2360
2361 return 1;
2362}
2363
Linus Torvalds1da177e2005-04-16 15:20:36 -07002364int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2365{
Alexey Dobriyand7c75442010-01-24 22:47:53 -08002366 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367 int err = 0;
2368 if (unlikely(afinfo == NULL))
2369 return -EINVAL;
2370 if (unlikely(afinfo->family >= NPROTO))
2371 return -EAFNOSUPPORT;
Ingo Molnare959d812006-04-28 15:32:29 -07002372 write_lock_bh(&xfrm_policy_afinfo_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2374 err = -ENOBUFS;
2375 else {
2376 struct dst_ops *dst_ops = afinfo->dst_ops;
2377 if (likely(dst_ops->kmem_cachep == NULL))
2378 dst_ops->kmem_cachep = xfrm_dst_cache;
2379 if (likely(dst_ops->check == NULL))
2380 dst_ops->check = xfrm_dst_check;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002381 if (likely(dst_ops->negative_advice == NULL))
2382 dst_ops->negative_advice = xfrm_negative_advice;
2383 if (likely(dst_ops->link_failure == NULL))
2384 dst_ops->link_failure = xfrm_link_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385 if (likely(afinfo->garbage_collect == NULL))
2386 afinfo->garbage_collect = __xfrm_garbage_collect;
2387 xfrm_policy_afinfo[afinfo->family] = afinfo;
2388 }
Ingo Molnare959d812006-04-28 15:32:29 -07002389 write_unlock_bh(&xfrm_policy_afinfo_lock);
Alexey Dobriyand7c75442010-01-24 22:47:53 -08002390
2391 rtnl_lock();
2392 for_each_net(net) {
2393 struct dst_ops *xfrm_dst_ops;
2394
2395 switch (afinfo->family) {
2396 case AF_INET:
2397 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2398 break;
2399#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2400 case AF_INET6:
2401 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2402 break;
2403#endif
2404 default:
2405 BUG();
2406 }
2407 *xfrm_dst_ops = *afinfo->dst_ops;
2408 }
2409 rtnl_unlock();
2410
Linus Torvalds1da177e2005-04-16 15:20:36 -07002411 return err;
2412}
2413EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2414
2415int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2416{
2417 int err = 0;
2418 if (unlikely(afinfo == NULL))
2419 return -EINVAL;
2420 if (unlikely(afinfo->family >= NPROTO))
2421 return -EAFNOSUPPORT;
Ingo Molnare959d812006-04-28 15:32:29 -07002422 write_lock_bh(&xfrm_policy_afinfo_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002423 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2424 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2425 err = -EINVAL;
2426 else {
2427 struct dst_ops *dst_ops = afinfo->dst_ops;
2428 xfrm_policy_afinfo[afinfo->family] = NULL;
2429 dst_ops->kmem_cachep = NULL;
2430 dst_ops->check = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431 dst_ops->negative_advice = NULL;
2432 dst_ops->link_failure = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002433 afinfo->garbage_collect = NULL;
2434 }
2435 }
Ingo Molnare959d812006-04-28 15:32:29 -07002436 write_unlock_bh(&xfrm_policy_afinfo_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002437 return err;
2438}
2439EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2440
Alexey Dobriyand7c75442010-01-24 22:47:53 -08002441static void __net_init xfrm_dst_ops_init(struct net *net)
2442{
2443 struct xfrm_policy_afinfo *afinfo;
2444
2445 read_lock_bh(&xfrm_policy_afinfo_lock);
2446 afinfo = xfrm_policy_afinfo[AF_INET];
2447 if (afinfo)
2448 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2449#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2450 afinfo = xfrm_policy_afinfo[AF_INET6];
2451 if (afinfo)
2452 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2453#endif
2454 read_unlock_bh(&xfrm_policy_afinfo_lock);
2455}
2456
Linus Torvalds1da177e2005-04-16 15:20:36 -07002457static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2458{
2459 struct xfrm_policy_afinfo *afinfo;
2460 if (unlikely(family >= NPROTO))
2461 return NULL;
2462 read_lock(&xfrm_policy_afinfo_lock);
2463 afinfo = xfrm_policy_afinfo[family];
Herbert Xu546be242006-05-27 23:03:58 -07002464 if (unlikely(!afinfo))
2465 read_unlock(&xfrm_policy_afinfo_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002466 return afinfo;
2467}
2468
2469static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2470{
Herbert Xu546be242006-05-27 23:03:58 -07002471 read_unlock(&xfrm_policy_afinfo_lock);
2472}
2473
Linus Torvalds1da177e2005-04-16 15:20:36 -07002474static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2475{
Eric W. Biedermane9dc8652007-09-12 13:02:17 +02002476 struct net_device *dev = ptr;
2477
Linus Torvalds1da177e2005-04-16 15:20:36 -07002478 switch (event) {
2479 case NETDEV_DOWN:
Timo Teräs80c802f2010-04-07 00:30:05 +00002480 __xfrm_garbage_collect(dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002481 }
2482 return NOTIFY_DONE;
2483}
2484
2485static struct notifier_block xfrm_dev_notifier = {
Alexey Dobriyand5917a32008-10-31 00:41:59 -07002486 .notifier_call = xfrm_dev_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002487};
2488
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002489#ifdef CONFIG_XFRM_STATISTICS
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002490static int __net_init xfrm_statistics_init(struct net *net)
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002491{
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08002492 int rv;
2493
Tejun Heo7d720c32010-02-16 15:20:26 +00002494 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
Eric Dumazet1823e4c82010-06-22 20:58:41 +00002495 sizeof(struct linux_xfrm_mib),
2496 __alignof__(struct linux_xfrm_mib)) < 0)
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002497 return -ENOMEM;
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08002498 rv = xfrm_proc_init(net);
2499 if (rv < 0)
Tejun Heo7d720c32010-02-16 15:20:26 +00002500 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08002501 return rv;
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002502}
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002503
2504static void xfrm_statistics_fini(struct net *net)
2505{
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08002506 xfrm_proc_fini(net);
Tejun Heo7d720c32010-02-16 15:20:26 +00002507 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002508}
2509#else
2510static int __net_init xfrm_statistics_init(struct net *net)
2511{
2512 return 0;
2513}
2514
2515static void xfrm_statistics_fini(struct net *net)
2516{
2517}
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002518#endif
2519
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002520static int __net_init xfrm_policy_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521{
David S. Miller2518c7c2006-08-24 04:45:07 -07002522 unsigned int hmask, sz;
2523 int dir;
2524
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002525 if (net_eq(net, &init_net))
2526 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002527 sizeof(struct xfrm_dst),
Alexey Dobriyane5d679f332006-08-26 19:25:52 -07002528 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
Paul Mundt20c2df82007-07-20 10:11:58 +09002529 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530
David S. Miller2518c7c2006-08-24 04:45:07 -07002531 hmask = 8 - 1;
2532 sz = (hmask+1) * sizeof(struct hlist_head);
2533
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002534 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2535 if (!net->xfrm.policy_byidx)
2536 goto out_byidx;
Alexey Dobriyan8100bea2008-11-25 17:22:58 -08002537 net->xfrm.policy_idx_hmask = hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -07002538
2539 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2540 struct xfrm_policy_hash *htab;
2541
Alexey Dobriyandc2caba2008-11-25 17:24:15 -08002542 net->xfrm.policy_count[dir] = 0;
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002543 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
David S. Miller2518c7c2006-08-24 04:45:07 -07002544
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002545 htab = &net->xfrm.policy_bydst[dir];
David S. Miller44e36b42006-08-24 04:50:50 -07002546 htab->table = xfrm_hash_alloc(sz);
David S. Miller2518c7c2006-08-24 04:45:07 -07002547 if (!htab->table)
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002548 goto out_bydst;
2549 htab->hmask = hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -07002550 }
2551
Alexey Dobriyanadfcf0b2008-11-25 17:22:11 -08002552 INIT_LIST_HEAD(&net->xfrm.policy_all);
Alexey Dobriyan66caf622008-11-25 17:28:57 -08002553 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002554 if (net_eq(net, &init_net))
2555 register_netdevice_notifier(&xfrm_dev_notifier);
2556 return 0;
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002557
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002558out_bydst:
2559 for (dir--; dir >= 0; dir--) {
2560 struct xfrm_policy_hash *htab;
2561
2562 htab = &net->xfrm.policy_bydst[dir];
2563 xfrm_hash_free(htab->table, sz);
2564 }
2565 xfrm_hash_free(net->xfrm.policy_byidx, sz);
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002566out_byidx:
2567 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002568}
2569
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002570static void xfrm_policy_fini(struct net *net)
2571{
Alexey Dobriyan7c2776e2008-11-25 17:57:44 -08002572 struct xfrm_audit audit_info;
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002573 unsigned int sz;
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002574 int dir;
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002575
Alexey Dobriyan7c2776e2008-11-25 17:57:44 -08002576 flush_work(&net->xfrm.policy_hash_work);
2577#ifdef CONFIG_XFRM_SUB_POLICY
2578 audit_info.loginuid = -1;
2579 audit_info.sessionid = -1;
2580 audit_info.secid = 0;
2581 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2582#endif
2583 audit_info.loginuid = -1;
2584 audit_info.sessionid = -1;
2585 audit_info.secid = 0;
2586 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
Alexey Dobriyan7c2776e2008-11-25 17:57:44 -08002587
Alexey Dobriyanadfcf0b2008-11-25 17:22:11 -08002588 WARN_ON(!list_empty(&net->xfrm.policy_all));
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002589
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002590 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002591 struct xfrm_policy_hash *htab;
2592
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002593 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002594
2595 htab = &net->xfrm.policy_bydst[dir];
2596 sz = (htab->hmask + 1);
2597 WARN_ON(!hlist_empty(htab->table));
2598 xfrm_hash_free(htab->table, sz);
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002599 }
2600
Alexey Dobriyan8100bea2008-11-25 17:22:58 -08002601 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002602 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2603 xfrm_hash_free(net->xfrm.policy_byidx, sz);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002604}
2605
2606static int __net_init xfrm_net_init(struct net *net)
2607{
2608 int rv;
2609
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002610 rv = xfrm_statistics_init(net);
2611 if (rv < 0)
2612 goto out_statistics;
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002613 rv = xfrm_state_init(net);
2614 if (rv < 0)
2615 goto out_state;
2616 rv = xfrm_policy_init(net);
2617 if (rv < 0)
2618 goto out_policy;
Alexey Dobriyand7c75442010-01-24 22:47:53 -08002619 xfrm_dst_ops_init(net);
Alexey Dobriyanb27aead2008-11-25 18:00:48 -08002620 rv = xfrm_sysctl_init(net);
2621 if (rv < 0)
2622 goto out_sysctl;
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002623 return 0;
2624
Alexey Dobriyanb27aead2008-11-25 18:00:48 -08002625out_sysctl:
2626 xfrm_policy_fini(net);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002627out_policy:
2628 xfrm_state_fini(net);
2629out_state:
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002630 xfrm_statistics_fini(net);
2631out_statistics:
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002632 return rv;
2633}
2634
2635static void __net_exit xfrm_net_exit(struct net *net)
2636{
Alexey Dobriyanb27aead2008-11-25 18:00:48 -08002637 xfrm_sysctl_fini(net);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002638 xfrm_policy_fini(net);
2639 xfrm_state_fini(net);
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002640 xfrm_statistics_fini(net);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002641}
2642
2643static struct pernet_operations __net_initdata xfrm_net_ops = {
2644 .init = xfrm_net_init,
2645 .exit = xfrm_net_exit,
2646};
2647
Linus Torvalds1da177e2005-04-16 15:20:36 -07002648void __init xfrm_init(void)
2649{
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002650 register_pernet_subsys(&xfrm_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002651 xfrm_input_init();
2652}
2653
Joy Lattenab5f5e82007-09-17 11:51:22 -07002654#ifdef CONFIG_AUDITSYSCALL
Ilpo Järvinen1486cbd72008-01-12 03:20:03 -08002655static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2656 struct audit_buffer *audit_buf)
Joy Lattenab5f5e82007-09-17 11:51:22 -07002657{
Paul Moore875179f2007-12-01 23:27:18 +11002658 struct xfrm_sec_ctx *ctx = xp->security;
2659 struct xfrm_selector *sel = &xp->selector;
Joy Lattenab5f5e82007-09-17 11:51:22 -07002660
Paul Moore875179f2007-12-01 23:27:18 +11002661 if (ctx)
2662 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2663 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2664
2665 switch(sel->family) {
Joy Lattenab5f5e82007-09-17 11:51:22 -07002666 case AF_INET:
Harvey Harrison21454aa2008-10-31 00:54:56 -07002667 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
Paul Moore875179f2007-12-01 23:27:18 +11002668 if (sel->prefixlen_s != 32)
2669 audit_log_format(audit_buf, " src_prefixlen=%d",
2670 sel->prefixlen_s);
Harvey Harrison21454aa2008-10-31 00:54:56 -07002671 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
Paul Moore875179f2007-12-01 23:27:18 +11002672 if (sel->prefixlen_d != 32)
2673 audit_log_format(audit_buf, " dst_prefixlen=%d",
2674 sel->prefixlen_d);
Joy Lattenab5f5e82007-09-17 11:51:22 -07002675 break;
2676 case AF_INET6:
Harvey Harrison5b095d9892008-10-29 12:52:50 -07002677 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
Paul Moore875179f2007-12-01 23:27:18 +11002678 if (sel->prefixlen_s != 128)
2679 audit_log_format(audit_buf, " src_prefixlen=%d",
2680 sel->prefixlen_s);
Harvey Harrison5b095d9892008-10-29 12:52:50 -07002681 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
Paul Moore875179f2007-12-01 23:27:18 +11002682 if (sel->prefixlen_d != 128)
2683 audit_log_format(audit_buf, " dst_prefixlen=%d",
2684 sel->prefixlen_d);
Joy Lattenab5f5e82007-09-17 11:51:22 -07002685 break;
2686 }
2687}
2688
Paul Moore68277ac2007-12-20 20:49:33 -08002689void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
Eric Paris25323862008-04-18 10:09:25 -04002690 uid_t auid, u32 sessionid, u32 secid)
Joy Lattenab5f5e82007-09-17 11:51:22 -07002691{
2692 struct audit_buffer *audit_buf;
Joy Lattenab5f5e82007-09-17 11:51:22 -07002693
Paul Mooreafeb14b2007-12-21 14:58:11 -08002694 audit_buf = xfrm_audit_start("SPD-add");
Joy Lattenab5f5e82007-09-17 11:51:22 -07002695 if (audit_buf == NULL)
2696 return;
Eric Paris25323862008-04-18 10:09:25 -04002697 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
Paul Mooreafeb14b2007-12-21 14:58:11 -08002698 audit_log_format(audit_buf, " res=%u", result);
Joy Lattenab5f5e82007-09-17 11:51:22 -07002699 xfrm_audit_common_policyinfo(xp, audit_buf);
2700 audit_log_end(audit_buf);
2701}
2702EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2703
Paul Moore68277ac2007-12-20 20:49:33 -08002704void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
Eric Paris25323862008-04-18 10:09:25 -04002705 uid_t auid, u32 sessionid, u32 secid)
Joy Lattenab5f5e82007-09-17 11:51:22 -07002706{
2707 struct audit_buffer *audit_buf;
Joy Lattenab5f5e82007-09-17 11:51:22 -07002708
Paul Mooreafeb14b2007-12-21 14:58:11 -08002709 audit_buf = xfrm_audit_start("SPD-delete");
Joy Lattenab5f5e82007-09-17 11:51:22 -07002710 if (audit_buf == NULL)
2711 return;
Eric Paris25323862008-04-18 10:09:25 -04002712 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
Paul Mooreafeb14b2007-12-21 14:58:11 -08002713 audit_log_format(audit_buf, " res=%u", result);
Joy Lattenab5f5e82007-09-17 11:51:22 -07002714 xfrm_audit_common_policyinfo(xp, audit_buf);
2715 audit_log_end(audit_buf);
2716}
2717EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2718#endif
2719
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002720#ifdef CONFIG_XFRM_MIGRATE
2721static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2722 struct xfrm_selector *sel_tgt)
2723{
2724 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2725 if (sel_tgt->family == sel_cmp->family &&
2726 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09002727 sel_cmp->family) == 0 &&
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002728 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2729 sel_cmp->family) == 0 &&
2730 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2731 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2732 return 1;
2733 }
2734 } else {
2735 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2736 return 1;
2737 }
2738 }
2739 return 0;
2740}
2741
2742static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2743 u8 dir, u8 type)
2744{
2745 struct xfrm_policy *pol, *ret = NULL;
2746 struct hlist_node *entry;
2747 struct hlist_head *chain;
2748 u32 priority = ~0U;
2749
2750 read_lock_bh(&xfrm_policy_lock);
Alexey Dobriyan11219942008-11-25 17:33:06 -08002751 chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002752 hlist_for_each_entry(pol, entry, chain, bydst) {
2753 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2754 pol->type == type) {
2755 ret = pol;
2756 priority = ret->priority;
2757 break;
2758 }
2759 }
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002760 chain = &init_net.xfrm.policy_inexact[dir];
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002761 hlist_for_each_entry(pol, entry, chain, bydst) {
2762 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2763 pol->type == type &&
2764 pol->priority < priority) {
2765 ret = pol;
2766 break;
2767 }
2768 }
2769
2770 if (ret)
2771 xfrm_pol_hold(ret);
2772
2773 read_unlock_bh(&xfrm_policy_lock);
2774
2775 return ret;
2776}
2777
2778static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2779{
2780 int match = 0;
2781
2782 if (t->mode == m->mode && t->id.proto == m->proto &&
2783 (m->reqid == 0 || t->reqid == m->reqid)) {
2784 switch (t->mode) {
2785 case XFRM_MODE_TUNNEL:
2786 case XFRM_MODE_BEET:
2787 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2788 m->old_family) == 0 &&
2789 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2790 m->old_family) == 0) {
2791 match = 1;
2792 }
2793 break;
2794 case XFRM_MODE_TRANSPORT:
2795 /* in case of transport mode, template does not store
2796 any IP addresses, hence we just compare mode and
2797 protocol */
2798 match = 1;
2799 break;
2800 default:
2801 break;
2802 }
2803 }
2804 return match;
2805}
2806
2807/* update endpoint address(es) of template(s) */
2808static int xfrm_policy_migrate(struct xfrm_policy *pol,
2809 struct xfrm_migrate *m, int num_migrate)
2810{
2811 struct xfrm_migrate *mp;
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002812 int i, j, n = 0;
2813
2814 write_lock_bh(&pol->lock);
Herbert Xu12a169e2008-10-01 07:03:24 -07002815 if (unlikely(pol->walk.dead)) {
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002816 /* target policy has been deleted */
2817 write_unlock_bh(&pol->lock);
2818 return -ENOENT;
2819 }
2820
2821 for (i = 0; i < pol->xfrm_nr; i++) {
2822 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2823 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2824 continue;
2825 n++;
Herbert Xu1bfcb102007-10-17 21:31:50 -07002826 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2827 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002828 continue;
2829 /* update endpoints */
2830 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2831 sizeof(pol->xfrm_vec[i].id.daddr));
2832 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2833 sizeof(pol->xfrm_vec[i].saddr));
2834 pol->xfrm_vec[i].encap_family = mp->new_family;
2835 /* flush bundles */
Timo Teräs80c802f2010-04-07 00:30:05 +00002836 atomic_inc(&pol->genid);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002837 }
2838 }
2839
2840 write_unlock_bh(&pol->lock);
2841
2842 if (!n)
2843 return -ENODATA;
2844
2845 return 0;
2846}
2847
2848static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2849{
2850 int i, j;
2851
2852 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2853 return -EINVAL;
2854
2855 for (i = 0; i < num_migrate; i++) {
2856 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2857 m[i].old_family) == 0) &&
2858 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2859 m[i].old_family) == 0))
2860 return -EINVAL;
2861 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2862 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2863 return -EINVAL;
2864
2865 /* check if there is any duplicated entry */
2866 for (j = i + 1; j < num_migrate; j++) {
2867 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2868 sizeof(m[i].old_daddr)) &&
2869 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2870 sizeof(m[i].old_saddr)) &&
2871 m[i].proto == m[j].proto &&
2872 m[i].mode == m[j].mode &&
2873 m[i].reqid == m[j].reqid &&
2874 m[i].old_family == m[j].old_family)
2875 return -EINVAL;
2876 }
2877 }
2878
2879 return 0;
2880}
2881
2882int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
Arnaud Ebalard13c1d182008-10-05 13:33:42 -07002883 struct xfrm_migrate *m, int num_migrate,
2884 struct xfrm_kmaddress *k)
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002885{
2886 int i, err, nx_cur = 0, nx_new = 0;
2887 struct xfrm_policy *pol = NULL;
2888 struct xfrm_state *x, *xc;
2889 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2890 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2891 struct xfrm_migrate *mp;
2892
2893 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2894 goto out;
2895
2896 /* Stage 1 - find policy */
2897 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2898 err = -ENOENT;
2899 goto out;
2900 }
2901
2902 /* Stage 2 - find and update state(s) */
2903 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2904 if ((x = xfrm_migrate_state_find(mp))) {
2905 x_cur[nx_cur] = x;
2906 nx_cur++;
2907 if ((xc = xfrm_state_migrate(x, mp))) {
2908 x_new[nx_new] = xc;
2909 nx_new++;
2910 } else {
2911 err = -ENODATA;
2912 goto restore_state;
2913 }
2914 }
2915 }
2916
2917 /* Stage 3 - update policy */
2918 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2919 goto restore_state;
2920
2921 /* Stage 4 - delete old state(s) */
2922 if (nx_cur) {
2923 xfrm_states_put(x_cur, nx_cur);
2924 xfrm_states_delete(x_cur, nx_cur);
2925 }
2926
2927 /* Stage 5 - announce */
Arnaud Ebalard13c1d182008-10-05 13:33:42 -07002928 km_migrate(sel, dir, type, m, num_migrate, k);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002929
2930 xfrm_pol_put(pol);
2931
2932 return 0;
2933out:
2934 return err;
2935
2936restore_state:
2937 if (pol)
2938 xfrm_pol_put(pol);
2939 if (nx_cur)
2940 xfrm_states_put(x_cur, nx_cur);
2941 if (nx_new)
2942 xfrm_states_delete(x_new, nx_new);
2943
2944 return err;
2945}
David S. Millere610e672007-02-08 13:29:15 -08002946EXPORT_SYMBOL(xfrm_migrate);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002947#endif