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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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Wei Yongjun29fa0b32008-12-03 00:33:09 -080054static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
55 int dir);
56
Andrew Morton77681022006-11-08 22:46:26 -080057static inline int
58__xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
59{
60 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
61 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
62 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
63 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
64 (fl->proto == sel->proto || !sel->proto) &&
65 (fl->oif == sel->ifindex || !sel->ifindex);
66}
67
68static inline int
69__xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
70{
71 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
72 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
73 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
74 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
75 (fl->proto == sel->proto || !sel->proto) &&
76 (fl->oif == sel->ifindex || !sel->ifindex);
77}
78
79int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
80 unsigned short family)
81{
82 switch (family) {
83 case AF_INET:
84 return __xfrm4_selector_match(sel, fl);
85 case AF_INET6:
86 return __xfrm6_selector_match(sel, fl);
87 }
88 return 0;
89}
90
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -080091static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +090092 xfrm_address_t *saddr,
93 xfrm_address_t *daddr,
94 int family)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
Herbert Xu66cdb3c2007-11-13 21:37:28 -080096 struct xfrm_policy_afinfo *afinfo;
97 struct dst_entry *dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Herbert Xu25ee3282007-12-11 09:32:34 -080099 afinfo = xfrm_policy_get_afinfo(family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 if (unlikely(afinfo == NULL))
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800101 return ERR_PTR(-EAFNOSUPPORT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -0800103 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900104
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 xfrm_policy_put_afinfo(afinfo);
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900106
107 return dst;
108}
109
110static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
111 xfrm_address_t *prev_saddr,
112 xfrm_address_t *prev_daddr,
113 int family)
114{
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -0800115 struct net *net = xs_net(x);
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900116 xfrm_address_t *saddr = &x->props.saddr;
117 xfrm_address_t *daddr = &x->id.daddr;
118 struct dst_entry *dst;
119
120 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
121 saddr = x->coaddr;
122 daddr = prev_daddr;
123 }
124 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
125 saddr = prev_saddr;
126 daddr = x->coaddr;
127 }
128
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -0800129 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +0900130
131 if (!IS_ERR(dst)) {
132 if (prev_saddr != saddr)
133 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
134 if (prev_daddr != daddr)
135 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
136 }
137
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800138 return dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141static inline unsigned long make_jiffies(long secs)
142{
143 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
144 return MAX_SCHEDULE_TIMEOUT-1;
145 else
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900146 return secs*HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
149static void xfrm_policy_timer(unsigned long data)
150{
151 struct xfrm_policy *xp = (struct xfrm_policy*)data;
James Morris9d729f72007-03-04 16:12:44 -0800152 unsigned long now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 long next = LONG_MAX;
154 int warn = 0;
155 int dir;
156
157 read_lock(&xp->lock);
158
Timo Teräsea2dea92010-03-31 00:17:05 +0000159 if (unlikely(xp->walk.dead))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 goto out;
161
Herbert Xu77d8d7a2005-10-05 12:15:12 -0700162 dir = xfrm_policy_id2dir(xp->index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
164 if (xp->lft.hard_add_expires_seconds) {
165 long tmo = xp->lft.hard_add_expires_seconds +
166 xp->curlft.add_time - now;
167 if (tmo <= 0)
168 goto expired;
169 if (tmo < next)
170 next = tmo;
171 }
172 if (xp->lft.hard_use_expires_seconds) {
173 long tmo = xp->lft.hard_use_expires_seconds +
174 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
175 if (tmo <= 0)
176 goto expired;
177 if (tmo < next)
178 next = tmo;
179 }
180 if (xp->lft.soft_add_expires_seconds) {
181 long tmo = xp->lft.soft_add_expires_seconds +
182 xp->curlft.add_time - now;
183 if (tmo <= 0) {
184 warn = 1;
185 tmo = XFRM_KM_TIMEOUT;
186 }
187 if (tmo < next)
188 next = tmo;
189 }
190 if (xp->lft.soft_use_expires_seconds) {
191 long tmo = xp->lft.soft_use_expires_seconds +
192 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
193 if (tmo <= 0) {
194 warn = 1;
195 tmo = XFRM_KM_TIMEOUT;
196 }
197 if (tmo < next)
198 next = tmo;
199 }
200
201 if (warn)
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -0800202 km_policy_expired(xp, dir, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (next != LONG_MAX &&
204 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
205 xfrm_pol_hold(xp);
206
207out:
208 read_unlock(&xp->lock);
209 xfrm_pol_put(xp);
210 return;
211
212expired:
213 read_unlock(&xp->lock);
Herbert Xu4666faa2005-06-18 22:43:22 -0700214 if (!xfrm_policy_delete(xp, dir))
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -0800215 km_policy_expired(xp, dir, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 xfrm_pol_put(xp);
217}
218
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000219static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
220{
221 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
222
223 if (unlikely(pol->walk.dead))
224 flo = NULL;
225 else
226 xfrm_pol_hold(pol);
227
228 return flo;
229}
230
231static int xfrm_policy_flo_check(struct flow_cache_object *flo)
232{
233 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
234
235 return !pol->walk.dead;
236}
237
238static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
239{
240 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
241}
242
243static const struct flow_cache_ops xfrm_policy_fc_ops = {
244 .get = xfrm_policy_flo_get,
245 .check = xfrm_policy_flo_check,
246 .delete = xfrm_policy_flo_delete,
247};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
250 * SPD calls.
251 */
252
Alexey Dobriyan0331b1f2008-11-25 17:21:45 -0800253struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
255 struct xfrm_policy *policy;
256
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700257 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
259 if (policy) {
Alexey Dobriyan0331b1f2008-11-25 17:21:45 -0800260 write_pnet(&policy->xp_net, net);
Herbert Xu12a169e2008-10-01 07:03:24 -0700261 INIT_LIST_HEAD(&policy->walk.all);
David S. Miller2518c7c2006-08-24 04:45:07 -0700262 INIT_HLIST_NODE(&policy->bydst);
263 INIT_HLIST_NODE(&policy->byidx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 rwlock_init(&policy->lock);
David S. Miller2518c7c2006-08-24 04:45:07 -0700265 atomic_set(&policy->refcnt, 1);
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -0800266 setup_timer(&policy->timer, xfrm_policy_timer,
267 (unsigned long)policy);
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000268 policy->flo.ops = &xfrm_policy_fc_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 }
270 return policy;
271}
272EXPORT_SYMBOL(xfrm_policy_alloc);
273
274/* Destroy xfrm_policy: descendant resources must be released to this moment. */
275
WANG Cong64c31b32008-01-07 22:34:29 -0800276void xfrm_policy_destroy(struct xfrm_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
Herbert Xu12a169e2008-10-01 07:03:24 -0700278 BUG_ON(!policy->walk.dead);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 if (del_timer(&policy->timer))
281 BUG();
282
Paul Moore03e1ad72008-04-12 19:07:52 -0700283 security_xfrm_policy_free(policy->security);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 kfree(policy);
285}
WANG Cong64c31b32008-01-07 22:34:29 -0800286EXPORT_SYMBOL(xfrm_policy_destroy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288/* Rule must be locked. Release descentant resources, announce
289 * entry dead. The rule must be unlinked from lists to the moment.
290 */
291
292static void xfrm_policy_kill(struct xfrm_policy *policy)
293{
Herbert Xu12a169e2008-10-01 07:03:24 -0700294 policy->walk.dead = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
Timo Teräs285ead12010-04-07 00:30:06 +0000296 atomic_inc(&policy->genid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Timo Teräs285ead12010-04-07 00:30:06 +0000298 if (del_timer(&policy->timer))
299 xfrm_pol_put(policy);
300
301 xfrm_pol_put(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302}
303
David S. Miller2518c7c2006-08-24 04:45:07 -0700304static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
305
Alexey Dobriyane92303f2008-11-25 17:32:41 -0800306static inline unsigned int idx_hash(struct net *net, u32 index)
David S. Miller2518c7c2006-08-24 04:45:07 -0700307{
Alexey Dobriyane92303f2008-11-25 17:32:41 -0800308 return __idx_hash(index, net->xfrm.policy_idx_hmask);
David S. Miller2518c7c2006-08-24 04:45:07 -0700309}
310
Alexey Dobriyan11219942008-11-25 17:33:06 -0800311static 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 -0700312{
Alexey Dobriyan11219942008-11-25 17:33:06 -0800313 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700314 unsigned int hash = __sel_hash(sel, family, hmask);
315
316 return (hash == hmask + 1 ?
Alexey Dobriyan11219942008-11-25 17:33:06 -0800317 &net->xfrm.policy_inexact[dir] :
318 net->xfrm.policy_bydst[dir].table + hash);
David S. Miller2518c7c2006-08-24 04:45:07 -0700319}
320
Alexey Dobriyan11219942008-11-25 17:33:06 -0800321static 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 -0700322{
Alexey Dobriyan11219942008-11-25 17:33:06 -0800323 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700324 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
325
Alexey Dobriyan11219942008-11-25 17:33:06 -0800326 return net->xfrm.policy_bydst[dir].table + hash;
David S. Miller2518c7c2006-08-24 04:45:07 -0700327}
328
David S. Miller2518c7c2006-08-24 04:45:07 -0700329static void xfrm_dst_hash_transfer(struct hlist_head *list,
330 struct hlist_head *ndsttable,
331 unsigned int nhashmask)
332{
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800333 struct hlist_node *entry, *tmp, *entry0 = NULL;
David S. Miller2518c7c2006-08-24 04:45:07 -0700334 struct xfrm_policy *pol;
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800335 unsigned int h0 = 0;
David S. Miller2518c7c2006-08-24 04:45:07 -0700336
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800337redo:
David S. Miller2518c7c2006-08-24 04:45:07 -0700338 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
339 unsigned int h;
340
341 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
342 pol->family, nhashmask);
YOSHIFUJI Hideakib7911602008-02-17 23:29:30 -0800343 if (!entry0) {
344 hlist_del(entry);
345 hlist_add_head(&pol->bydst, ndsttable+h);
346 h0 = h;
347 } else {
348 if (h != h0)
349 continue;
350 hlist_del(entry);
351 hlist_add_after(entry0, &pol->bydst);
352 }
353 entry0 = entry;
354 }
355 if (!hlist_empty(list)) {
356 entry0 = NULL;
357 goto redo;
David S. Miller2518c7c2006-08-24 04:45:07 -0700358 }
359}
360
361static void xfrm_idx_hash_transfer(struct hlist_head *list,
362 struct hlist_head *nidxtable,
363 unsigned int nhashmask)
364{
365 struct hlist_node *entry, *tmp;
366 struct xfrm_policy *pol;
367
368 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
369 unsigned int h;
370
371 h = __idx_hash(pol->index, nhashmask);
372 hlist_add_head(&pol->byidx, nidxtable+h);
373 }
374}
375
376static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
377{
378 return ((old_hmask + 1) << 1) - 1;
379}
380
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800381static void xfrm_bydst_resize(struct net *net, int dir)
David S. Miller2518c7c2006-08-24 04:45:07 -0700382{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800383 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700384 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
385 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800386 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
David S. Miller44e36b42006-08-24 04:50:50 -0700387 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
David S. Miller2518c7c2006-08-24 04:45:07 -0700388 int i;
389
390 if (!ndst)
391 return;
392
393 write_lock_bh(&xfrm_policy_lock);
394
395 for (i = hmask; i >= 0; i--)
396 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
397
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800398 net->xfrm.policy_bydst[dir].table = ndst;
399 net->xfrm.policy_bydst[dir].hmask = nhashmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700400
401 write_unlock_bh(&xfrm_policy_lock);
402
David S. Miller44e36b42006-08-24 04:50:50 -0700403 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
David S. Miller2518c7c2006-08-24 04:45:07 -0700404}
405
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800406static void xfrm_byidx_resize(struct net *net, int total)
David S. Miller2518c7c2006-08-24 04:45:07 -0700407{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800408 unsigned int hmask = net->xfrm.policy_idx_hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700409 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
410 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800411 struct hlist_head *oidx = net->xfrm.policy_byidx;
David S. Miller44e36b42006-08-24 04:50:50 -0700412 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
David S. Miller2518c7c2006-08-24 04:45:07 -0700413 int i;
414
415 if (!nidx)
416 return;
417
418 write_lock_bh(&xfrm_policy_lock);
419
420 for (i = hmask; i >= 0; i--)
421 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
422
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800423 net->xfrm.policy_byidx = nidx;
424 net->xfrm.policy_idx_hmask = nhashmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700425
426 write_unlock_bh(&xfrm_policy_lock);
427
David S. Miller44e36b42006-08-24 04:50:50 -0700428 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
David S. Miller2518c7c2006-08-24 04:45:07 -0700429}
430
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800431static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
David S. Miller2518c7c2006-08-24 04:45:07 -0700432{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800433 unsigned int cnt = net->xfrm.policy_count[dir];
434 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700435
436 if (total)
437 *total += cnt;
438
439 if ((hmask + 1) < xfrm_policy_hashmax &&
440 cnt > hmask)
441 return 1;
442
443 return 0;
444}
445
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800446static inline int xfrm_byidx_should_resize(struct net *net, int total)
David S. Miller2518c7c2006-08-24 04:45:07 -0700447{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800448 unsigned int hmask = net->xfrm.policy_idx_hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -0700449
450 if ((hmask + 1) < xfrm_policy_hashmax &&
451 total > hmask)
452 return 1;
453
454 return 0;
455}
456
Alexey Dobriyane0710412010-01-23 13:37:10 +0000457void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
Jamal Hadi Salimecfd6b12007-04-28 21:20:32 -0700458{
459 read_lock_bh(&xfrm_policy_lock);
Alexey Dobriyane0710412010-01-23 13:37:10 +0000460 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
461 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
462 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
463 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
464 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
465 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
466 si->spdhcnt = net->xfrm.policy_idx_hmask;
Jamal Hadi Salimecfd6b12007-04-28 21:20:32 -0700467 si->spdhmcnt = xfrm_policy_hashmax;
468 read_unlock_bh(&xfrm_policy_lock);
469}
470EXPORT_SYMBOL(xfrm_spd_getinfo);
David S. Miller2518c7c2006-08-24 04:45:07 -0700471
Jamal Hadi Salimecfd6b12007-04-28 21:20:32 -0700472static DEFINE_MUTEX(hash_resize_mutex);
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800473static void xfrm_hash_resize(struct work_struct *work)
David S. Miller2518c7c2006-08-24 04:45:07 -0700474{
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800475 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
David S. Miller2518c7c2006-08-24 04:45:07 -0700476 int dir, total;
477
478 mutex_lock(&hash_resize_mutex);
479
480 total = 0;
481 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800482 if (xfrm_bydst_should_resize(net, dir, &total))
483 xfrm_bydst_resize(net, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700484 }
Alexey Dobriyan66caf622008-11-25 17:28:57 -0800485 if (xfrm_byidx_should_resize(net, total))
486 xfrm_byidx_resize(net, total);
David S. Miller2518c7c2006-08-24 04:45:07 -0700487
488 mutex_unlock(&hash_resize_mutex);
489}
490
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491/* Generate new index... KAME seems to generate them ordered by cost
492 * of an absolute inpredictability of ordering of rules. This will not pass. */
Alexey Dobriyan11219942008-11-25 17:33:06 -0800493static u32 xfrm_gen_index(struct net *net, int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 static u32 idx_generator;
496
497 for (;;) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700498 struct hlist_node *entry;
499 struct hlist_head *list;
500 struct xfrm_policy *p;
501 u32 idx;
502 int found;
503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 idx = (idx_generator | dir);
505 idx_generator += 8;
506 if (idx == 0)
507 idx = 8;
Alexey Dobriyan11219942008-11-25 17:33:06 -0800508 list = net->xfrm.policy_byidx + idx_hash(net, idx);
David S. Miller2518c7c2006-08-24 04:45:07 -0700509 found = 0;
510 hlist_for_each_entry(p, entry, list, byidx) {
511 if (p->index == idx) {
512 found = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 break;
David S. Miller2518c7c2006-08-24 04:45:07 -0700514 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 }
David S. Miller2518c7c2006-08-24 04:45:07 -0700516 if (!found)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 return idx;
518 }
519}
520
David S. Miller2518c7c2006-08-24 04:45:07 -0700521static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
522{
523 u32 *p1 = (u32 *) s1;
524 u32 *p2 = (u32 *) s2;
525 int len = sizeof(struct xfrm_selector) / sizeof(u32);
526 int i;
527
528 for (i = 0; i < len; i++) {
529 if (p1[i] != p2[i])
530 return 1;
531 }
532
533 return 0;
534}
535
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
537{
Alexey Dobriyan11219942008-11-25 17:33:06 -0800538 struct net *net = xp_net(policy);
David S. Miller2518c7c2006-08-24 04:45:07 -0700539 struct xfrm_policy *pol;
540 struct xfrm_policy *delpol;
541 struct hlist_head *chain;
Herbert Xua6c7ab52007-01-16 16:52:02 -0800542 struct hlist_node *entry, *newpos;
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +0000543 u32 mark = policy->mark.v & policy->mark.m;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
545 write_lock_bh(&xfrm_policy_lock);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800546 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700547 delpol = NULL;
548 newpos = NULL;
David S. Miller2518c7c2006-08-24 04:45:07 -0700549 hlist_for_each_entry(pol, entry, chain, bydst) {
Herbert Xua6c7ab52007-01-16 16:52:02 -0800550 if (pol->type == policy->type &&
David S. Miller2518c7c2006-08-24 04:45:07 -0700551 !selector_cmp(&pol->selector, &policy->selector) &&
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +0000552 (mark & pol->mark.m) == pol->mark.v &&
Herbert Xua6c7ab52007-01-16 16:52:02 -0800553 xfrm_sec_ctx_match(pol->security, policy->security) &&
554 !WARN_ON(delpol)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 if (excl) {
556 write_unlock_bh(&xfrm_policy_lock);
557 return -EEXIST;
558 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 delpol = pol;
560 if (policy->priority > pol->priority)
561 continue;
562 } else if (policy->priority >= pol->priority) {
Herbert Xua6c7ab52007-01-16 16:52:02 -0800563 newpos = &pol->bydst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 continue;
565 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 if (delpol)
567 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 }
569 if (newpos)
David S. Miller2518c7c2006-08-24 04:45:07 -0700570 hlist_add_after(newpos, &policy->bydst);
571 else
572 hlist_add_head(&policy->bydst, chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 xfrm_pol_hold(policy);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800574 net->xfrm.policy_count[dir]++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 atomic_inc(&flow_cache_genid);
Wei Yongjun29fa0b32008-12-03 00:33:09 -0800576 if (delpol)
577 __xfrm_policy_unlink(delpol, dir);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800578 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir);
579 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
James Morris9d729f72007-03-04 16:12:44 -0800580 policy->curlft.add_time = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 policy->curlft.use_time = 0;
582 if (!mod_timer(&policy->timer, jiffies + HZ))
583 xfrm_pol_hold(policy);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800584 list_add(&policy->walk.all, &net->xfrm.policy_all);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 write_unlock_bh(&xfrm_policy_lock);
586
David S. Miller9b78a822005-12-22 07:39:48 -0800587 if (delpol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 xfrm_policy_kill(delpol);
Alexey Dobriyan11219942008-11-25 17:33:06 -0800589 else if (xfrm_bydst_should_resize(net, dir, NULL))
590 schedule_work(&net->xfrm.policy_hash_work);
David S. Miller9b78a822005-12-22 07:39:48 -0800591
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 return 0;
593}
594EXPORT_SYMBOL(xfrm_policy_insert);
595
Jamal Hadi Salim8ca2e932010-02-22 11:32:57 +0000596struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
597 int dir, struct xfrm_selector *sel,
Eric Parisef41aaa2007-03-07 15:37:58 -0800598 struct xfrm_sec_ctx *ctx, int delete,
599 int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600{
David S. Miller2518c7c2006-08-24 04:45:07 -0700601 struct xfrm_policy *pol, *ret;
602 struct hlist_head *chain;
603 struct hlist_node *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
Eric Parisef41aaa2007-03-07 15:37:58 -0800605 *err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 write_lock_bh(&xfrm_policy_lock);
Alexey Dobriyan8d1211a2008-11-25 17:34:20 -0800607 chain = policy_hash_bysel(net, sel, sel->family, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700608 ret = NULL;
609 hlist_for_each_entry(pol, entry, chain, bydst) {
610 if (pol->type == type &&
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +0000611 (mark & pol->mark.m) == pol->mark.v &&
David S. Miller2518c7c2006-08-24 04:45:07 -0700612 !selector_cmp(sel, &pol->selector) &&
613 xfrm_sec_ctx_match(ctx, pol->security)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 xfrm_pol_hold(pol);
David S. Miller2518c7c2006-08-24 04:45:07 -0700615 if (delete) {
Paul Moore03e1ad72008-04-12 19:07:52 -0700616 *err = security_xfrm_policy_delete(
617 pol->security);
Eric Parisef41aaa2007-03-07 15:37:58 -0800618 if (*err) {
619 write_unlock_bh(&xfrm_policy_lock);
620 return pol;
621 }
Wei Yongjun29fa0b32008-12-03 00:33:09 -0800622 __xfrm_policy_unlink(pol, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700623 }
624 ret = pol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 break;
626 }
627 }
628 write_unlock_bh(&xfrm_policy_lock);
629
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000630 if (ret && delete)
David S. Miller2518c7c2006-08-24 04:45:07 -0700631 xfrm_policy_kill(ret);
David S. Miller2518c7c2006-08-24 04:45:07 -0700632 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633}
Trent Jaegerdf718372005-12-13 23:12:27 -0800634EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
Jamal Hadi Salim8ca2e932010-02-22 11:32:57 +0000636struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
637 int dir, u32 id, int delete, int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638{
David S. Miller2518c7c2006-08-24 04:45:07 -0700639 struct xfrm_policy *pol, *ret;
640 struct hlist_head *chain;
641 struct hlist_node *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Herbert Xub5505c62007-05-14 02:15:47 -0700643 *err = -ENOENT;
644 if (xfrm_policy_id2dir(id) != dir)
645 return NULL;
646
Eric Parisef41aaa2007-03-07 15:37:58 -0800647 *err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 write_lock_bh(&xfrm_policy_lock);
Alexey Dobriyan8d1211a2008-11-25 17:34:20 -0800649 chain = net->xfrm.policy_byidx + idx_hash(net, id);
David S. Miller2518c7c2006-08-24 04:45:07 -0700650 ret = NULL;
651 hlist_for_each_entry(pol, entry, chain, byidx) {
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +0000652 if (pol->type == type && pol->index == id &&
653 (mark & pol->mark.m) == pol->mark.v) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 xfrm_pol_hold(pol);
David S. Miller2518c7c2006-08-24 04:45:07 -0700655 if (delete) {
Paul Moore03e1ad72008-04-12 19:07:52 -0700656 *err = security_xfrm_policy_delete(
657 pol->security);
Eric Parisef41aaa2007-03-07 15:37:58 -0800658 if (*err) {
659 write_unlock_bh(&xfrm_policy_lock);
660 return pol;
661 }
Wei Yongjun29fa0b32008-12-03 00:33:09 -0800662 __xfrm_policy_unlink(pol, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700663 }
664 ret = pol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 break;
666 }
667 }
668 write_unlock_bh(&xfrm_policy_lock);
669
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000670 if (ret && delete)
David S. Miller2518c7c2006-08-24 04:45:07 -0700671 xfrm_policy_kill(ret);
David S. Miller2518c7c2006-08-24 04:45:07 -0700672 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673}
674EXPORT_SYMBOL(xfrm_policy_byid);
675
Joy Latten4aa2e622007-06-04 19:05:57 -0400676#ifdef CONFIG_SECURITY_NETWORK_XFRM
677static inline int
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800678xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679{
Joy Latten4aa2e622007-06-04 19:05:57 -0400680 int dir, err = 0;
681
682 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
683 struct xfrm_policy *pol;
684 struct hlist_node *entry;
685 int i;
686
687 hlist_for_each_entry(pol, entry,
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800688 &net->xfrm.policy_inexact[dir], bydst) {
Joy Latten4aa2e622007-06-04 19:05:57 -0400689 if (pol->type != type)
690 continue;
Paul Moore03e1ad72008-04-12 19:07:52 -0700691 err = security_xfrm_policy_delete(pol->security);
Joy Latten4aa2e622007-06-04 19:05:57 -0400692 if (err) {
Joy Lattenab5f5e82007-09-17 11:51:22 -0700693 xfrm_audit_policy_delete(pol, 0,
694 audit_info->loginuid,
Eric Paris25323862008-04-18 10:09:25 -0400695 audit_info->sessionid,
Joy Lattenab5f5e82007-09-17 11:51:22 -0700696 audit_info->secid);
Joy Latten4aa2e622007-06-04 19:05:57 -0400697 return err;
698 }
YOSHIFUJI Hideaki7dc12d62007-07-19 10:45:15 +0900699 }
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800700 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
Joy Latten4aa2e622007-06-04 19:05:57 -0400701 hlist_for_each_entry(pol, entry,
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800702 net->xfrm.policy_bydst[dir].table + i,
Joy Latten4aa2e622007-06-04 19:05:57 -0400703 bydst) {
704 if (pol->type != type)
705 continue;
Paul Moore03e1ad72008-04-12 19:07:52 -0700706 err = security_xfrm_policy_delete(
707 pol->security);
Joy Latten4aa2e622007-06-04 19:05:57 -0400708 if (err) {
Joy Lattenab5f5e82007-09-17 11:51:22 -0700709 xfrm_audit_policy_delete(pol, 0,
710 audit_info->loginuid,
Eric Paris25323862008-04-18 10:09:25 -0400711 audit_info->sessionid,
Joy Lattenab5f5e82007-09-17 11:51:22 -0700712 audit_info->secid);
Joy Latten4aa2e622007-06-04 19:05:57 -0400713 return err;
714 }
715 }
716 }
717 }
718 return err;
719}
720#else
721static inline int
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800722xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
Joy Latten4aa2e622007-06-04 19:05:57 -0400723{
724 return 0;
725}
726#endif
727
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800728int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
Joy Latten4aa2e622007-06-04 19:05:57 -0400729{
Jamal Hadi Salim2f1eb652010-02-19 02:00:42 +0000730 int dir, err = 0, cnt = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
732 write_lock_bh(&xfrm_policy_lock);
Joy Latten4aa2e622007-06-04 19:05:57 -0400733
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800734 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
Joy Latten4aa2e622007-06-04 19:05:57 -0400735 if (err)
736 goto out;
737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700739 struct xfrm_policy *pol;
740 struct hlist_node *entry;
Wei Yongjun29fa0b32008-12-03 00:33:09 -0800741 int i;
David S. Miller2518c7c2006-08-24 04:45:07 -0700742
743 again1:
744 hlist_for_each_entry(pol, entry,
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800745 &net->xfrm.policy_inexact[dir], bydst) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700746 if (pol->type != type)
747 continue;
Timo Teräsea2dea92010-03-31 00:17:05 +0000748 __xfrm_policy_unlink(pol, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 write_unlock_bh(&xfrm_policy_lock);
Timo Teräsea2dea92010-03-31 00:17:05 +0000750 cnt++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751
Joy Lattenab5f5e82007-09-17 11:51:22 -0700752 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
Eric Paris25323862008-04-18 10:09:25 -0400753 audit_info->sessionid,
Joy Lattenab5f5e82007-09-17 11:51:22 -0700754 audit_info->secid);
Joy Latten161a09e2006-11-27 13:11:54 -0600755
David S. Miller2518c7c2006-08-24 04:45:07 -0700756 xfrm_policy_kill(pol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
758 write_lock_bh(&xfrm_policy_lock);
David S. Miller2518c7c2006-08-24 04:45:07 -0700759 goto again1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 }
David S. Miller2518c7c2006-08-24 04:45:07 -0700761
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800762 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700763 again2:
764 hlist_for_each_entry(pol, entry,
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -0800765 net->xfrm.policy_bydst[dir].table + i,
David S. Miller2518c7c2006-08-24 04:45:07 -0700766 bydst) {
767 if (pol->type != type)
768 continue;
Timo Teräsea2dea92010-03-31 00:17:05 +0000769 __xfrm_policy_unlink(pol, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700770 write_unlock_bh(&xfrm_policy_lock);
Timo Teräsea2dea92010-03-31 00:17:05 +0000771 cnt++;
David S. Miller2518c7c2006-08-24 04:45:07 -0700772
Joy Lattenab5f5e82007-09-17 11:51:22 -0700773 xfrm_audit_policy_delete(pol, 1,
774 audit_info->loginuid,
Eric Paris25323862008-04-18 10:09:25 -0400775 audit_info->sessionid,
Joy Lattenab5f5e82007-09-17 11:51:22 -0700776 audit_info->secid);
David S. Miller2518c7c2006-08-24 04:45:07 -0700777 xfrm_policy_kill(pol);
778
779 write_lock_bh(&xfrm_policy_lock);
780 goto again2;
781 }
782 }
783
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 }
Jamal Hadi Salim2f1eb652010-02-19 02:00:42 +0000785 if (!cnt)
786 err = -ESRCH;
Joy Latten4aa2e622007-06-04 19:05:57 -0400787out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 write_unlock_bh(&xfrm_policy_lock);
Joy Latten4aa2e622007-06-04 19:05:57 -0400789 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790}
791EXPORT_SYMBOL(xfrm_policy_flush);
792
Alexey Dobriyancdcbca72008-11-25 17:34:49 -0800793int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
Timo Teras4c563f72008-02-28 21:31:08 -0800794 int (*func)(struct xfrm_policy *, int, int, void*),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 void *data)
796{
Herbert Xu12a169e2008-10-01 07:03:24 -0700797 struct xfrm_policy *pol;
798 struct xfrm_policy_walk_entry *x;
Timo Teras4c563f72008-02-28 21:31:08 -0800799 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
Timo Teras4c563f72008-02-28 21:31:08 -0800801 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
802 walk->type != XFRM_POLICY_TYPE_ANY)
803 return -EINVAL;
804
Herbert Xu12a169e2008-10-01 07:03:24 -0700805 if (list_empty(&walk->walk.all) && walk->seq != 0)
Timo Teras4c563f72008-02-28 21:31:08 -0800806 return 0;
807
Herbert Xu12a169e2008-10-01 07:03:24 -0700808 write_lock_bh(&xfrm_policy_lock);
809 if (list_empty(&walk->walk.all))
Alexey Dobriyancdcbca72008-11-25 17:34:49 -0800810 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
Herbert Xu12a169e2008-10-01 07:03:24 -0700811 else
812 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
Alexey Dobriyancdcbca72008-11-25 17:34:49 -0800813 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
Herbert Xu12a169e2008-10-01 07:03:24 -0700814 if (x->dead)
Timo Teras4c563f72008-02-28 21:31:08 -0800815 continue;
Herbert Xu12a169e2008-10-01 07:03:24 -0700816 pol = container_of(x, struct xfrm_policy, walk);
817 if (walk->type != XFRM_POLICY_TYPE_ANY &&
818 walk->type != pol->type)
819 continue;
820 error = func(pol, xfrm_policy_id2dir(pol->index),
821 walk->seq, data);
822 if (error) {
823 list_move_tail(&walk->walk.all, &x->all);
824 goto out;
Timo Teras4c563f72008-02-28 21:31:08 -0800825 }
Herbert Xu12a169e2008-10-01 07:03:24 -0700826 walk->seq++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 }
Herbert Xu12a169e2008-10-01 07:03:24 -0700828 if (walk->seq == 0) {
Jamal Hadi Salimbaf5d742006-12-04 20:02:37 -0800829 error = -ENOENT;
830 goto out;
831 }
Herbert Xu12a169e2008-10-01 07:03:24 -0700832 list_del_init(&walk->walk.all);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833out:
Herbert Xu12a169e2008-10-01 07:03:24 -0700834 write_unlock_bh(&xfrm_policy_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 return error;
836}
837EXPORT_SYMBOL(xfrm_policy_walk);
838
Herbert Xu12a169e2008-10-01 07:03:24 -0700839void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
840{
841 INIT_LIST_HEAD(&walk->walk.all);
842 walk->walk.dead = 1;
843 walk->type = type;
844 walk->seq = 0;
845}
846EXPORT_SYMBOL(xfrm_policy_walk_init);
847
848void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
849{
850 if (list_empty(&walk->walk.all))
851 return;
852
853 write_lock_bh(&xfrm_policy_lock);
854 list_del(&walk->walk.all);
855 write_unlock_bh(&xfrm_policy_lock);
856}
857EXPORT_SYMBOL(xfrm_policy_walk_done);
858
James Morris134b0fc2006-10-05 15:42:27 -0500859/*
860 * Find policy to apply to this flow.
861 *
862 * Returns 0 if policy found, else an -errno.
863 */
David S. Miller2518c7c2006-08-24 04:45:07 -0700864static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
865 u8 type, u16 family, int dir)
866{
867 struct xfrm_selector *sel = &pol->selector;
James Morris134b0fc2006-10-05 15:42:27 -0500868 int match, ret = -ESRCH;
David S. Miller2518c7c2006-08-24 04:45:07 -0700869
870 if (pol->family != family ||
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +0000871 (fl->mark & pol->mark.m) != pol->mark.v ||
David S. Miller2518c7c2006-08-24 04:45:07 -0700872 pol->type != type)
James Morris134b0fc2006-10-05 15:42:27 -0500873 return ret;
David S. Miller2518c7c2006-08-24 04:45:07 -0700874
875 match = xfrm_selector_match(sel, fl, family);
James Morris134b0fc2006-10-05 15:42:27 -0500876 if (match)
Paul Moore03e1ad72008-04-12 19:07:52 -0700877 ret = security_xfrm_policy_lookup(pol->security, fl->secid,
878 dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700879
James Morris134b0fc2006-10-05 15:42:27 -0500880 return ret;
David S. Miller2518c7c2006-08-24 04:45:07 -0700881}
882
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800883static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
884 struct flowi *fl,
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700885 u16 family, u8 dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886{
James Morris134b0fc2006-10-05 15:42:27 -0500887 int err;
David S. Miller2518c7c2006-08-24 04:45:07 -0700888 struct xfrm_policy *pol, *ret;
889 xfrm_address_t *daddr, *saddr;
890 struct hlist_node *entry;
891 struct hlist_head *chain;
David S. Milleracba48e2006-08-25 15:46:46 -0700892 u32 priority = ~0U;
David S. Miller2518c7c2006-08-24 04:45:07 -0700893
894 daddr = xfrm_flowi_daddr(fl, family);
895 saddr = xfrm_flowi_saddr(fl, family);
896 if (unlikely(!daddr || !saddr))
897 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899 read_lock_bh(&xfrm_policy_lock);
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800900 chain = policy_hash_direct(net, daddr, saddr, family, dir);
David S. Miller2518c7c2006-08-24 04:45:07 -0700901 ret = NULL;
902 hlist_for_each_entry(pol, entry, chain, bydst) {
James Morris134b0fc2006-10-05 15:42:27 -0500903 err = xfrm_policy_match(pol, fl, type, family, dir);
904 if (err) {
905 if (err == -ESRCH)
906 continue;
907 else {
908 ret = ERR_PTR(err);
909 goto fail;
910 }
911 } else {
David S. Milleracba48e2006-08-25 15:46:46 -0700912 ret = pol;
913 priority = ret->priority;
914 break;
915 }
916 }
Alexey Dobriyan52479b62008-11-25 17:35:18 -0800917 chain = &net->xfrm.policy_inexact[dir];
David S. Milleracba48e2006-08-25 15:46:46 -0700918 hlist_for_each_entry(pol, entry, chain, bydst) {
James Morris134b0fc2006-10-05 15:42:27 -0500919 err = xfrm_policy_match(pol, fl, type, family, dir);
920 if (err) {
921 if (err == -ESRCH)
922 continue;
923 else {
924 ret = ERR_PTR(err);
925 goto fail;
926 }
927 } else if (pol->priority < priority) {
David S. Miller2518c7c2006-08-24 04:45:07 -0700928 ret = pol;
929 break;
930 }
931 }
David S. Milleracba48e2006-08-25 15:46:46 -0700932 if (ret)
933 xfrm_pol_hold(ret);
James Morris134b0fc2006-10-05 15:42:27 -0500934fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 read_unlock_bh(&xfrm_policy_lock);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700936
David S. Miller2518c7c2006-08-24 04:45:07 -0700937 return ret;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700938}
939
Timo Teräs80c802f2010-04-07 00:30:05 +0000940static struct xfrm_policy *
941__xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir)
942{
943#ifdef CONFIG_XFRM_SUB_POLICY
944 struct xfrm_policy *pol;
945
946 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
947 if (pol != NULL)
948 return pol;
949#endif
950 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
951}
952
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000953static struct flow_cache_object *
954xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family,
955 u8 dir, struct flow_cache_object *old_obj, void *ctx)
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700956{
957 struct xfrm_policy *pol;
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000958
959 if (old_obj)
960 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700961
Timo Teräs80c802f2010-04-07 00:30:05 +0000962 pol = __xfrm_policy_lookup(net, fl, family, dir);
963 if (IS_ERR_OR_NULL(pol))
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000964 return ERR_CAST(pol);
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000965
Timo Teräsfe1a5f02010-04-07 00:30:04 +0000966 /* Resolver returns two references:
967 * one for cache and one for caller of flow_cache_lookup() */
968 xfrm_pol_hold(pol);
969
970 return &pol->flo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971}
972
Trent Jaegerdf718372005-12-13 23:12:27 -0800973static inline int policy_to_flow_dir(int dir)
974{
975 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900976 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
977 XFRM_POLICY_FWD == FLOW_DIR_FWD)
978 return dir;
979 switch (dir) {
980 default:
981 case XFRM_POLICY_IN:
982 return FLOW_DIR_IN;
983 case XFRM_POLICY_OUT:
984 return FLOW_DIR_OUT;
985 case XFRM_POLICY_FWD:
986 return FLOW_DIR_FWD;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700987 }
Trent Jaegerdf718372005-12-13 23:12:27 -0800988}
989
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -0700990static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991{
992 struct xfrm_policy *pol;
993
994 read_lock_bh(&xfrm_policy_lock);
995 if ((pol = sk->sk_policy[dir]) != NULL) {
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900996 int match = xfrm_selector_match(&pol->selector, fl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 sk->sk_family);
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +0900998 int err = 0;
Trent Jaegerdf718372005-12-13 23:12:27 -0800999
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05001000 if (match) {
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +00001001 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1002 pol = NULL;
1003 goto out;
1004 }
Paul Moore03e1ad72008-04-12 19:07:52 -07001005 err = security_xfrm_policy_lookup(pol->security,
1006 fl->secid,
1007 policy_to_flow_dir(dir));
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05001008 if (!err)
1009 xfrm_pol_hold(pol);
1010 else if (err == -ESRCH)
1011 pol = NULL;
1012 else
1013 pol = ERR_PTR(err);
1014 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 pol = NULL;
1016 }
Jamal Hadi Salim34f8d882010-02-22 11:32:58 +00001017out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 read_unlock_bh(&xfrm_policy_lock);
1019 return pol;
1020}
1021
1022static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1023{
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001024 struct net *net = xp_net(pol);
Alexey Dobriyan11219942008-11-25 17:33:06 -08001025 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
David S. Miller2518c7c2006-08-24 04:45:07 -07001026 pol->family, dir);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001027
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001028 list_add(&pol->walk.all, &net->xfrm.policy_all);
David S. Miller2518c7c2006-08-24 04:45:07 -07001029 hlist_add_head(&pol->bydst, chain);
Alexey Dobriyane92303f2008-11-25 17:32:41 -08001030 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001031 net->xfrm.policy_count[dir]++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 xfrm_pol_hold(pol);
David S. Miller2518c7c2006-08-24 04:45:07 -07001033
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001034 if (xfrm_bydst_should_resize(net, dir, NULL))
1035 schedule_work(&net->xfrm.policy_hash_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036}
1037
1038static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1039 int dir)
1040{
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001041 struct net *net = xp_net(pol);
1042
David S. Miller2518c7c2006-08-24 04:45:07 -07001043 if (hlist_unhashed(&pol->bydst))
1044 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
David S. Miller2518c7c2006-08-24 04:45:07 -07001046 hlist_del(&pol->bydst);
1047 hlist_del(&pol->byidx);
Herbert Xu12a169e2008-10-01 07:03:24 -07001048 list_del(&pol->walk.all);
Alexey Dobriyan98806f72008-11-25 17:29:47 -08001049 net->xfrm.policy_count[dir]--;
David S. Miller2518c7c2006-08-24 04:45:07 -07001050
1051 return pol;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052}
1053
Herbert Xu4666faa2005-06-18 22:43:22 -07001054int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055{
1056 write_lock_bh(&xfrm_policy_lock);
1057 pol = __xfrm_policy_unlink(pol, dir);
1058 write_unlock_bh(&xfrm_policy_lock);
1059 if (pol) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 xfrm_policy_kill(pol);
Herbert Xu4666faa2005-06-18 22:43:22 -07001061 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 }
Herbert Xu4666faa2005-06-18 22:43:22 -07001063 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064}
David S. Millera70fcb02006-03-20 19:18:52 -08001065EXPORT_SYMBOL(xfrm_policy_delete);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066
1067int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1068{
Alexey Dobriyan11219942008-11-25 17:33:06 -08001069 struct net *net = xp_net(pol);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 struct xfrm_policy *old_pol;
1071
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001072#ifdef CONFIG_XFRM_SUB_POLICY
1073 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1074 return -EINVAL;
1075#endif
1076
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 write_lock_bh(&xfrm_policy_lock);
1078 old_pol = sk->sk_policy[dir];
1079 sk->sk_policy[dir] = pol;
1080 if (pol) {
James Morris9d729f72007-03-04 16:12:44 -08001081 pol->curlft.add_time = get_seconds();
Alexey Dobriyan11219942008-11-25 17:33:06 -08001082 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1084 }
1085 if (old_pol)
Timo Teräsea2dea92010-03-31 00:17:05 +00001086 /* Unlinking succeeds always. This is the only function
1087 * allowed to delete or replace socket policy.
1088 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1090 write_unlock_bh(&xfrm_policy_lock);
1091
1092 if (old_pol) {
1093 xfrm_policy_kill(old_pol);
1094 }
1095 return 0;
1096}
1097
1098static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1099{
Alexey Dobriyan0331b1f2008-11-25 17:21:45 -08001100 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101
1102 if (newp) {
1103 newp->selector = old->selector;
Paul Moore03e1ad72008-04-12 19:07:52 -07001104 if (security_xfrm_policy_clone(old->security,
1105 &newp->security)) {
Trent Jaegerdf718372005-12-13 23:12:27 -08001106 kfree(newp);
1107 return NULL; /* ENOMEM */
1108 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 newp->lft = old->lft;
1110 newp->curlft = old->curlft;
Jamal Hadi Salimfb977e22010-02-23 15:09:53 -08001111 newp->mark = old->mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 newp->action = old->action;
1113 newp->flags = old->flags;
1114 newp->xfrm_nr = old->xfrm_nr;
1115 newp->index = old->index;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001116 newp->type = old->type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 memcpy(newp->xfrm_vec, old->xfrm_vec,
1118 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1119 write_lock_bh(&xfrm_policy_lock);
1120 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1121 write_unlock_bh(&xfrm_policy_lock);
1122 xfrm_pol_put(newp);
1123 }
1124 return newp;
1125}
1126
1127int __xfrm_sk_clone_policy(struct sock *sk)
1128{
1129 struct xfrm_policy *p0 = sk->sk_policy[0],
1130 *p1 = sk->sk_policy[1];
1131
1132 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1133 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1134 return -ENOMEM;
1135 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1136 return -ENOMEM;
1137 return 0;
1138}
1139
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001140static int
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -08001141xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001142 unsigned short family)
1143{
1144 int err;
1145 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1146
1147 if (unlikely(afinfo == NULL))
1148 return -EINVAL;
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -08001149 err = afinfo->get_saddr(net, local, remote);
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001150 xfrm_policy_put_afinfo(afinfo);
1151 return err;
1152}
1153
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154/* Resolve list of templates for the flow, given policy. */
1155
1156static int
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001157xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1158 struct xfrm_state **xfrm,
1159 unsigned short family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160{
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -08001161 struct net *net = xp_net(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 int nx;
1163 int i, error;
1164 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1165 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001166 xfrm_address_t tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
1168 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1169 struct xfrm_state *x;
1170 xfrm_address_t *remote = daddr;
1171 xfrm_address_t *local = saddr;
1172 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1173
Joakim Koskela48b8d782007-07-26 00:08:42 -07001174 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1175 tmpl->mode == XFRM_MODE_BEET) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 remote = &tmpl->id.daddr;
1177 local = &tmpl->saddr;
Miika Komu76b3f052006-11-30 16:40:43 -08001178 family = tmpl->encap_family;
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001179 if (xfrm_addr_any(local, family)) {
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -08001180 error = xfrm_get_saddr(net, &tmp, remote, family);
Patrick McHardya1e59ab2006-09-19 12:57:34 -07001181 if (error)
1182 goto fail;
1183 local = &tmp;
1184 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 }
1186
1187 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1188
1189 if (x && x->km.state == XFRM_STATE_VALID) {
1190 xfrm[nx++] = x;
1191 daddr = remote;
1192 saddr = local;
1193 continue;
1194 }
1195 if (x) {
1196 error = (x->km.state == XFRM_STATE_ERROR ?
1197 -EINVAL : -EAGAIN);
1198 xfrm_state_put(x);
1199 }
fernando@oss.ntt.coa43222662008-10-23 04:27:19 +00001200 else if (error == -ESRCH)
1201 error = -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
1203 if (!tmpl->optional)
1204 goto fail;
1205 }
1206 return nx;
1207
1208fail:
1209 for (nx--; nx>=0; nx--)
1210 xfrm_state_put(xfrm[nx]);
1211 return error;
1212}
1213
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001214static int
1215xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1216 struct xfrm_state **xfrm,
1217 unsigned short family)
1218{
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001219 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1220 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001221 int cnx = 0;
1222 int error;
1223 int ret;
1224 int i;
1225
1226 for (i = 0; i < npols; i++) {
1227 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1228 error = -ENOBUFS;
1229 goto fail;
1230 }
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001231
1232 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001233 if (ret < 0) {
1234 error = ret;
1235 goto fail;
1236 } else
1237 cnx += ret;
1238 }
1239
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001240 /* found states are sorted for outbound processing */
1241 if (npols > 1)
1242 xfrm_state_sort(xfrm, tpp, cnx, family);
1243
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001244 return cnx;
1245
1246 fail:
1247 for (cnx--; cnx>=0; cnx--)
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001248 xfrm_state_put(tpp[cnx]);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001249 return error;
1250
1251}
1252
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253/* Check that the bundle accepts the flow and its components are
1254 * still valid.
1255 */
1256
Herbert Xu25ee3282007-12-11 09:32:34 -08001257static inline int xfrm_get_tos(struct flowi *fl, int family)
1258{
1259 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1260 int tos;
1261
1262 if (!afinfo)
1263 return -EINVAL;
1264
1265 tos = afinfo->get_tos(fl);
1266
1267 xfrm_policy_put_afinfo(afinfo);
1268
1269 return tos;
1270}
1271
Timo Teräs80c802f2010-04-07 00:30:05 +00001272static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1273{
1274 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1275 struct dst_entry *dst = &xdst->u.dst;
1276
1277 if (xdst->route == NULL) {
1278 /* Dummy bundle - if it has xfrms we were not
1279 * able to build bundle as template resolution failed.
1280 * It means we need to try again resolving. */
1281 if (xdst->num_xfrms > 0)
1282 return NULL;
1283 } else {
1284 /* Real bundle */
1285 if (stale_bundle(dst))
1286 return NULL;
1287 }
1288
1289 dst_hold(dst);
1290 return flo;
1291}
1292
1293static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1294{
1295 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1296 struct dst_entry *dst = &xdst->u.dst;
1297
1298 if (!xdst->route)
1299 return 0;
1300 if (stale_bundle(dst))
1301 return 0;
1302
1303 return 1;
1304}
1305
1306static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1307{
1308 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1309 struct dst_entry *dst = &xdst->u.dst;
1310
1311 dst_free(dst);
1312}
1313
1314static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1315 .get = xfrm_bundle_flo_get,
1316 .check = xfrm_bundle_flo_check,
1317 .delete = xfrm_bundle_flo_delete,
1318};
1319
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001320static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
Herbert Xu25ee3282007-12-11 09:32:34 -08001321{
1322 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001323 struct dst_ops *dst_ops;
Herbert Xu25ee3282007-12-11 09:32:34 -08001324 struct xfrm_dst *xdst;
1325
1326 if (!afinfo)
1327 return ERR_PTR(-EINVAL);
1328
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001329 switch (family) {
1330 case AF_INET:
1331 dst_ops = &net->xfrm.xfrm4_dst_ops;
1332 break;
1333#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1334 case AF_INET6:
1335 dst_ops = &net->xfrm.xfrm6_dst_ops;
1336 break;
1337#endif
1338 default:
1339 BUG();
1340 }
1341 xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS);
Herbert Xu25ee3282007-12-11 09:32:34 -08001342 xfrm_policy_put_afinfo(afinfo);
1343
Timo Teräs80c802f2010-04-07 00:30:05 +00001344 xdst->flo.ops = &xfrm_bundle_fc_ops;
1345
Herbert Xu25ee3282007-12-11 09:32:34 -08001346 return xdst;
1347}
1348
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001349static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1350 int nfheader_len)
1351{
1352 struct xfrm_policy_afinfo *afinfo =
1353 xfrm_policy_get_afinfo(dst->ops->family);
1354 int err;
1355
1356 if (!afinfo)
1357 return -EINVAL;
1358
1359 err = afinfo->init_path(path, dst, nfheader_len);
1360
1361 xfrm_policy_put_afinfo(afinfo);
1362
1363 return err;
1364}
1365
Herbert Xu87c1e122010-03-02 02:51:56 +00001366static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1367 struct flowi *fl)
Herbert Xu25ee3282007-12-11 09:32:34 -08001368{
1369 struct xfrm_policy_afinfo *afinfo =
1370 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1371 int err;
1372
1373 if (!afinfo)
1374 return -EINVAL;
1375
Herbert Xu87c1e122010-03-02 02:51:56 +00001376 err = afinfo->fill_dst(xdst, dev, fl);
Herbert Xu25ee3282007-12-11 09:32:34 -08001377
1378 xfrm_policy_put_afinfo(afinfo);
1379
1380 return err;
1381}
1382
Timo Teräs80c802f2010-04-07 00:30:05 +00001383
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384/* Allocate chain of dst_entry's, attach known xfrm's, calculate
1385 * all the metrics... Shortly, bundle a bundle.
1386 */
1387
Herbert Xu25ee3282007-12-11 09:32:34 -08001388static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1389 struct xfrm_state **xfrm, int nx,
1390 struct flowi *fl,
1391 struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392{
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001393 struct net *net = xp_net(policy);
Herbert Xu25ee3282007-12-11 09:32:34 -08001394 unsigned long now = jiffies;
1395 struct net_device *dev;
1396 struct dst_entry *dst_prev = NULL;
1397 struct dst_entry *dst0 = NULL;
1398 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 int err;
Herbert Xu25ee3282007-12-11 09:32:34 -08001400 int header_len = 0;
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001401 int nfheader_len = 0;
Herbert Xu25ee3282007-12-11 09:32:34 -08001402 int trailer_len = 0;
1403 int tos;
1404 int family = policy->selector.family;
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +09001405 xfrm_address_t saddr, daddr;
1406
1407 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
Herbert Xu25ee3282007-12-11 09:32:34 -08001408
1409 tos = xfrm_get_tos(fl, family);
1410 err = tos;
1411 if (tos < 0)
1412 goto put_states;
1413
1414 dst_hold(dst);
1415
1416 for (; i < nx; i++) {
Alexey Dobriyand7c75442010-01-24 22:47:53 -08001417 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
Herbert Xu25ee3282007-12-11 09:32:34 -08001418 struct dst_entry *dst1 = &xdst->u.dst;
1419
1420 err = PTR_ERR(xdst);
1421 if (IS_ERR(xdst)) {
1422 dst_release(dst);
1423 goto put_states;
1424 }
1425
1426 if (!dst_prev)
1427 dst0 = dst1;
1428 else {
1429 dst_prev->child = dst_clone(dst1);
1430 dst1->flags |= DST_NOHASH;
1431 }
1432
1433 xdst->route = dst;
1434 memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics));
1435
1436 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1437 family = xfrm[i]->props.family;
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +09001438 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1439 family);
Herbert Xu25ee3282007-12-11 09:32:34 -08001440 err = PTR_ERR(dst);
1441 if (IS_ERR(dst))
1442 goto put_states;
1443 } else
1444 dst_hold(dst);
1445
1446 dst1->xfrm = xfrm[i];
Timo Teräs80c802f2010-04-07 00:30:05 +00001447 xdst->xfrm_genid = xfrm[i]->genid;
Herbert Xu25ee3282007-12-11 09:32:34 -08001448
1449 dst1->obsolete = -1;
1450 dst1->flags |= DST_HOST;
1451 dst1->lastuse = now;
1452
1453 dst1->input = dst_discard;
1454 dst1->output = xfrm[i]->outer_mode->afinfo->output;
1455
1456 dst1->next = dst_prev;
1457 dst_prev = dst1;
1458
1459 header_len += xfrm[i]->props.header_len;
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001460 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1461 nfheader_len += xfrm[i]->props.header_len;
Herbert Xu25ee3282007-12-11 09:32:34 -08001462 trailer_len += xfrm[i]->props.trailer_len;
1463 }
1464
1465 dst_prev->child = dst;
1466 dst0->path = dst;
1467
1468 err = -ENODEV;
1469 dev = dst->dev;
1470 if (!dev)
1471 goto free_dst;
1472
Ralf Baechle96c53402009-12-25 23:30:02 +00001473 /* Copy neighbour for reachability confirmation */
Herbert Xu25ee3282007-12-11 09:32:34 -08001474 dst0->neighbour = neigh_clone(dst->neighbour);
1475
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -08001476 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
Herbert Xu25ee3282007-12-11 09:32:34 -08001477 xfrm_init_pmtu(dst_prev);
1478
1479 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1480 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1481
Herbert Xu87c1e122010-03-02 02:51:56 +00001482 err = xfrm_fill_dst(xdst, dev, fl);
Herbert Xu25ee3282007-12-11 09:32:34 -08001483 if (err)
1484 goto free_dst;
1485
1486 dst_prev->header_len = header_len;
1487 dst_prev->trailer_len = trailer_len;
1488 header_len -= xdst->u.dst.xfrm->props.header_len;
1489 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1490 }
1491
1492out:
1493 return dst0;
1494
1495put_states:
1496 for (; i < nx; i++)
1497 xfrm_state_put(xfrm[i]);
1498free_dst:
1499 if (dst0)
1500 dst_free(dst0);
1501 dst0 = ERR_PTR(err);
1502 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503}
1504
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -07001505static int inline
1506xfrm_dst_alloc_copy(void **target, void *src, int size)
1507{
1508 if (!*target) {
1509 *target = kmalloc(size, GFP_ATOMIC);
1510 if (!*target)
1511 return -ENOMEM;
1512 }
1513 memcpy(*target, src, size);
1514 return 0;
1515}
1516
1517static int inline
1518xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
1519{
1520#ifdef CONFIG_XFRM_SUB_POLICY
1521 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1522 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1523 sel, sizeof(*sel));
1524#else
1525 return 0;
1526#endif
1527}
1528
1529static int inline
1530xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
1531{
1532#ifdef CONFIG_XFRM_SUB_POLICY
1533 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1534 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1535#else
1536 return 0;
1537#endif
1538}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539
Timo Teräs80c802f2010-04-07 00:30:05 +00001540static int xfrm_expand_policies(struct flowi *fl, u16 family,
1541 struct xfrm_policy **pols,
1542 int *num_pols, int *num_xfrms)
1543{
1544 int i;
1545
1546 if (*num_pols == 0 || !pols[0]) {
1547 *num_pols = 0;
1548 *num_xfrms = 0;
1549 return 0;
1550 }
1551 if (IS_ERR(pols[0]))
1552 return PTR_ERR(pols[0]);
1553
1554 *num_xfrms = pols[0]->xfrm_nr;
1555
1556#ifdef CONFIG_XFRM_SUB_POLICY
1557 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1558 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1559 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1560 XFRM_POLICY_TYPE_MAIN,
1561 fl, family,
1562 XFRM_POLICY_OUT);
1563 if (pols[1]) {
1564 if (IS_ERR(pols[1])) {
1565 xfrm_pols_put(pols, *num_pols);
1566 return PTR_ERR(pols[1]);
1567 }
1568 (*num_pols) ++;
1569 (*num_xfrms) += pols[1]->xfrm_nr;
1570 }
1571 }
1572#endif
1573 for (i = 0; i < *num_pols; i++) {
1574 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1575 *num_xfrms = -1;
1576 break;
1577 }
1578 }
1579
1580 return 0;
1581
1582}
1583
1584static struct xfrm_dst *
1585xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1586 struct flowi *fl, u16 family,
1587 struct dst_entry *dst_orig)
1588{
1589 struct net *net = xp_net(pols[0]);
1590 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1591 struct dst_entry *dst;
1592 struct xfrm_dst *xdst;
1593 int err;
1594
1595 /* Try to instantiate a bundle */
1596 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1597 if (err < 0) {
1598 if (err != -EAGAIN)
1599 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1600 return ERR_PTR(err);
1601 }
1602
1603 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1604 if (IS_ERR(dst)) {
1605 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1606 return ERR_CAST(dst);
1607 }
1608
1609 xdst = (struct xfrm_dst *)dst;
1610 xdst->num_xfrms = err;
1611 if (num_pols > 1)
1612 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1613 else
1614 err = xfrm_dst_update_origin(dst, fl);
1615 if (unlikely(err)) {
1616 dst_free(dst);
1617 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1618 return ERR_PTR(err);
1619 }
1620
1621 xdst->num_pols = num_pols;
1622 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1623 xdst->policy_genid = atomic_read(&pols[0]->genid);
1624
1625 return xdst;
1626}
1627
1628static struct flow_cache_object *
1629xfrm_bundle_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir,
1630 struct flow_cache_object *oldflo, void *ctx)
1631{
1632 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1633 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1634 struct xfrm_dst *xdst, *new_xdst;
1635 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1636
1637 /* Check if the policies from old bundle are usable */
1638 xdst = NULL;
1639 if (oldflo) {
1640 xdst = container_of(oldflo, struct xfrm_dst, flo);
1641 num_pols = xdst->num_pols;
1642 num_xfrms = xdst->num_xfrms;
1643 pol_dead = 0;
1644 for (i = 0; i < num_pols; i++) {
1645 pols[i] = xdst->pols[i];
1646 pol_dead |= pols[i]->walk.dead;
1647 }
1648 if (pol_dead) {
1649 dst_free(&xdst->u.dst);
1650 xdst = NULL;
1651 num_pols = 0;
1652 num_xfrms = 0;
1653 oldflo = NULL;
1654 }
1655 }
1656
1657 /* Resolve policies to use if we couldn't get them from
1658 * previous cache entry */
1659 if (xdst == NULL) {
1660 num_pols = 1;
1661 pols[0] = __xfrm_policy_lookup(net, fl, family, dir);
1662 err = xfrm_expand_policies(fl, family, pols,
1663 &num_pols, &num_xfrms);
1664 if (err < 0)
1665 goto inc_error;
1666 if (num_pols == 0)
1667 return NULL;
1668 if (num_xfrms <= 0)
1669 goto make_dummy_bundle;
1670 }
1671
1672 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1673 if (IS_ERR(new_xdst)) {
1674 err = PTR_ERR(new_xdst);
1675 if (err != -EAGAIN)
1676 goto error;
1677 if (oldflo == NULL)
1678 goto make_dummy_bundle;
1679 dst_hold(&xdst->u.dst);
1680 return oldflo;
1681 }
1682
1683 /* Kill the previous bundle */
1684 if (xdst) {
1685 /* The policies were stolen for newly generated bundle */
1686 xdst->num_pols = 0;
1687 dst_free(&xdst->u.dst);
1688 }
1689
1690 /* Flow cache does not have reference, it dst_free()'s,
1691 * but we do need to return one reference for original caller */
1692 dst_hold(&new_xdst->u.dst);
1693 return &new_xdst->flo;
1694
1695make_dummy_bundle:
1696 /* We found policies, but there's no bundles to instantiate:
1697 * either because the policy blocks, has no transformations or
1698 * we could not build template (no xfrm_states).*/
1699 xdst = xfrm_alloc_dst(net, family);
1700 if (IS_ERR(xdst)) {
1701 xfrm_pols_put(pols, num_pols);
1702 return ERR_CAST(xdst);
1703 }
1704 xdst->num_pols = num_pols;
1705 xdst->num_xfrms = num_xfrms;
1706 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1707
1708 dst_hold(&xdst->u.dst);
1709 return &xdst->flo;
1710
1711inc_error:
1712 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1713error:
1714 if (xdst != NULL)
1715 dst_free(&xdst->u.dst);
1716 else
1717 xfrm_pols_put(pols, num_pols);
1718 return ERR_PTR(err);
1719}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720
1721/* Main function: finds/creates a bundle for given flow.
1722 *
1723 * At the moment we eat a raw IP route. Mostly to speed up lookups
1724 * on interfaces with disabled IPsec.
1725 */
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001726int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
David S. Miller14e50e52007-05-24 18:17:54 -07001727 struct sock *sk, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728{
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001729 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
Timo Teräs80c802f2010-04-07 00:30:05 +00001730 struct flow_cache_object *flo;
1731 struct xfrm_dst *xdst;
1732 struct dst_entry *dst, *dst_orig = *dst_p, *route;
1733 u16 family = dst_orig->ops->family;
Trent Jaegerdf718372005-12-13 23:12:27 -08001734 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
Changli Gao4b021622010-04-27 21:20:22 +00001735 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07001736
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737restart:
Timo Teräs80c802f2010-04-07 00:30:05 +00001738 dst = NULL;
1739 xdst = NULL;
1740 route = NULL;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001741
Thomas Graff7944fb2007-08-25 13:46:55 -07001742 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
Timo Teräs80c802f2010-04-07 00:30:05 +00001743 num_pols = 1;
1744 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1745 err = xfrm_expand_policies(fl, family, pols,
1746 &num_pols, &num_xfrms);
1747 if (err < 0)
Herbert Xu75b8c132007-12-11 04:38:08 -08001748 goto dropdst;
Timo Teräs80c802f2010-04-07 00:30:05 +00001749
1750 if (num_pols) {
1751 if (num_xfrms <= 0) {
1752 drop_pols = num_pols;
1753 goto no_transform;
1754 }
1755
1756 xdst = xfrm_resolve_and_create_bundle(
1757 pols, num_pols, fl,
1758 family, dst_orig);
1759 if (IS_ERR(xdst)) {
1760 xfrm_pols_put(pols, num_pols);
1761 err = PTR_ERR(xdst);
1762 goto dropdst;
1763 }
1764
1765 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
1766 xdst->u.dst.next = xfrm_policy_sk_bundles;
1767 xfrm_policy_sk_bundles = &xdst->u.dst;
1768 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
1769
1770 route = xdst->route;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08001771 }
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05001772 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773
Timo Teräs80c802f2010-04-07 00:30:05 +00001774 if (xdst == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775 /* To accelerate a bit... */
David S. Miller2518c7c2006-08-24 04:45:07 -07001776 if ((dst_orig->flags & DST_NOXFRM) ||
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001777 !net->xfrm.policy_count[XFRM_POLICY_OUT])
Herbert Xu8b7817f2007-12-12 10:44:43 -08001778 goto nopol;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001779
Timo Teräs80c802f2010-04-07 00:30:05 +00001780 flo = flow_cache_lookup(net, fl, family, dir,
1781 xfrm_bundle_lookup, dst_orig);
1782 if (flo == NULL)
1783 goto nopol;
Timo Teräsfe1a5f02010-04-07 00:30:04 +00001784 if (IS_ERR(flo)) {
Timo Teräs80c802f2010-04-07 00:30:05 +00001785 err = PTR_ERR(flo);
Herbert Xu75b8c132007-12-11 04:38:08 -08001786 goto dropdst;
Masahide NAKAMURAd66e37a2008-01-07 21:46:15 -08001787 }
Timo Teräs80c802f2010-04-07 00:30:05 +00001788 xdst = container_of(flo, struct xfrm_dst, flo);
1789
1790 num_pols = xdst->num_pols;
1791 num_xfrms = xdst->num_xfrms;
1792 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols);
1793 route = xdst->route;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 }
1795
Timo Teräs80c802f2010-04-07 00:30:05 +00001796 dst = &xdst->u.dst;
1797 if (route == NULL && num_xfrms > 0) {
1798 /* The only case when xfrm_bundle_lookup() returns a
1799 * bundle with null route, is when the template could
1800 * not be resolved. It means policies are there, but
1801 * bundle could not be created, since we don't yet
1802 * have the xfrm_state's. We need to wait for KM to
1803 * negotiate new SA's or bail out with error.*/
1804 if (net->xfrm.sysctl_larval_drop) {
1805 /* EREMOTE tells the caller to generate
1806 * a one-shot blackhole route. */
1807 dst_release(dst);
Timo Terasa1aa3482010-05-15 23:49:26 -07001808 xfrm_pols_put(pols, drop_pols);
Timo Teräs80c802f2010-04-07 00:30:05 +00001809 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1810 return -EREMOTE;
1811 }
1812 if (flags & XFRM_LOOKUP_WAIT) {
1813 DECLARE_WAITQUEUE(wait, current);
1814
1815 add_wait_queue(&net->xfrm.km_waitq, &wait);
1816 set_current_state(TASK_INTERRUPTIBLE);
1817 schedule();
1818 set_current_state(TASK_RUNNING);
1819 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1820
1821 if (!signal_pending(current)) {
1822 dst_release(dst);
1823 goto restart;
1824 }
1825
1826 err = -ERESTART;
1827 } else
1828 err = -EAGAIN;
1829
1830 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1831 goto error;
1832 }
1833
1834no_transform:
1835 if (num_pols == 0)
Herbert Xu8b7817f2007-12-12 10:44:43 -08001836 goto nopol;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837
Timo Teräs80c802f2010-04-07 00:30:05 +00001838 if ((flags & XFRM_LOOKUP_ICMP) &&
1839 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
1840 err = -ENOENT;
Herbert Xu8b7817f2007-12-12 10:44:43 -08001841 goto error;
Timo Teräs80c802f2010-04-07 00:30:05 +00001842 }
Herbert Xu8b7817f2007-12-12 10:44:43 -08001843
Timo Teräs80c802f2010-04-07 00:30:05 +00001844 for (i = 0; i < num_pols; i++)
1845 pols[i]->curlft.use_time = get_seconds();
Herbert Xu8b7817f2007-12-12 10:44:43 -08001846
Timo Teräs80c802f2010-04-07 00:30:05 +00001847 if (num_xfrms < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848 /* Prohibit the flow */
Alexey Dobriyan59c99402008-11-25 17:59:52 -08001849 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
Patrick McHardye1044112005-09-08 15:11:55 -07001850 err = -EPERM;
1851 goto error;
Timo Teräs80c802f2010-04-07 00:30:05 +00001852 } else if (num_xfrms > 0) {
1853 /* Flow transformed */
1854 *dst_p = dst;
1855 dst_release(dst_orig);
1856 } else {
1857 /* Flow passes untransformed */
1858 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859 }
Timo Teräs80c802f2010-04-07 00:30:05 +00001860ok:
1861 xfrm_pols_put(pols, drop_pols);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862 return 0;
1863
Timo Teräs80c802f2010-04-07 00:30:05 +00001864nopol:
1865 if (!(flags & XFRM_LOOKUP_ICMP))
1866 goto ok;
1867 err = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868error:
Timo Teräs80c802f2010-04-07 00:30:05 +00001869 dst_release(dst);
Herbert Xu75b8c132007-12-11 04:38:08 -08001870dropdst:
1871 dst_release(dst_orig);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 *dst_p = NULL;
Timo Teräs80c802f2010-04-07 00:30:05 +00001873 xfrm_pols_put(pols, drop_pols);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874 return err;
1875}
David S. Miller14e50e52007-05-24 18:17:54 -07001876EXPORT_SYMBOL(__xfrm_lookup);
1877
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001878int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
David S. Miller14e50e52007-05-24 18:17:54 -07001879 struct sock *sk, int flags)
1880{
Alexey Dobriyan52479b62008-11-25 17:35:18 -08001881 int err = __xfrm_lookup(net, dst_p, fl, sk, flags);
David S. Miller14e50e52007-05-24 18:17:54 -07001882
1883 if (err == -EREMOTE) {
1884 dst_release(*dst_p);
1885 *dst_p = NULL;
1886 err = -EAGAIN;
1887 }
1888
1889 return err;
1890}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891EXPORT_SYMBOL(xfrm_lookup);
1892
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001893static inline int
1894xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1895{
1896 struct xfrm_state *x;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001897
1898 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1899 return 0;
1900 x = skb->sp->xvec[idx];
1901 if (!x->type->reject)
1902 return 0;
Herbert Xu1ecafed2007-10-09 13:24:07 -07001903 return x->type->reject(x, skb, fl);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001904}
1905
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906/* When skb is transformed back to its "native" form, we have to
1907 * check policy restrictions. At the moment we make this in maximally
1908 * stupid way. Shame on me. :-) Of course, connected sockets must
1909 * have policy cached at them.
1910 */
1911
1912static inline int
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09001913xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 unsigned short family)
1915{
1916 if (xfrm_state_kern(x))
Kazunori MIYAZAWA928ba412007-02-13 12:57:16 -08001917 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 return x->id.proto == tmpl->id.proto &&
1919 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1920 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1921 x->props.mode == tmpl->mode &&
Herbert Xuc5d18e92008-04-22 00:46:42 -07001922 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
Masahide NAKAMURAf3bd4842006-08-23 18:00:48 -07001923 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -07001924 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1925 xfrm_state_addr_cmp(tmpl, x, family));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926}
1927
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001928/*
1929 * 0 or more than 0 is returned when validation is succeeded (either bypass
1930 * because of optional transport mode, or next index of the mathced secpath
1931 * state with the template.
1932 * -1 is returned when no matching template is found.
1933 * Otherwise "-2 - errored_index" is returned.
1934 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935static inline int
1936xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1937 unsigned short family)
1938{
1939 int idx = start;
1940
1941 if (tmpl->optional) {
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -07001942 if (tmpl->mode == XFRM_MODE_TRANSPORT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 return start;
1944 } else
1945 start = -1;
1946 for (; idx < sp->len; idx++) {
Herbert Xudbe5b4a2006-04-01 00:54:16 -08001947 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 return ++idx;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001949 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1950 if (start == -1)
1951 start = -2-idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952 break;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001953 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 }
1955 return start;
1956}
1957
Herbert Xud5422ef2007-12-12 10:44:16 -08001958int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1959 unsigned int family, int reverse)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960{
1961 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07001962 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963
1964 if (unlikely(afinfo == NULL))
1965 return -EAFNOSUPPORT;
1966
Herbert Xud5422ef2007-12-12 10:44:16 -08001967 afinfo->decode_session(skb, fl, reverse);
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07001968 err = security_xfrm_decode_session(skb, &fl->secid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969 xfrm_policy_put_afinfo(afinfo);
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07001970 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971}
Herbert Xud5422ef2007-12-12 10:44:16 -08001972EXPORT_SYMBOL(__xfrm_decode_session);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001974static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975{
1976 for (; k < sp->len; k++) {
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001977 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
James Morrisd1d9fac2006-09-01 00:32:12 -07001978 *idxp = k;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979 return 1;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001980 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981 }
1982
1983 return 0;
1984}
1985
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09001986int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987 unsigned short family)
1988{
Alexey Dobriyanf6e1e252008-11-25 17:35:44 -08001989 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990 struct xfrm_policy *pol;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001991 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1992 int npols = 0;
1993 int xfrm_nr;
1994 int pi;
Herbert Xud5422ef2007-12-12 10:44:16 -08001995 int reverse;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001996 struct flowi fl;
Herbert Xud5422ef2007-12-12 10:44:16 -08001997 u8 fl_dir;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07001998 int xerr_idx = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999
Herbert Xud5422ef2007-12-12 10:44:16 -08002000 reverse = dir & ~XFRM_POLICY_MASK;
2001 dir &= XFRM_POLICY_MASK;
2002 fl_dir = policy_to_flow_dir(dir);
2003
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002004 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002005 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002007 }
2008
Patrick McHardyeb9c7eb2006-01-06 23:06:30 -08002009 nf_nat_decode_session(skb, &fl, family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010
2011 /* First, check used SA against their selectors. */
2012 if (skb->sp) {
2013 int i;
2014
2015 for (i=skb->sp->len-1; i>=0; i--) {
Herbert Xudbe5b4a2006-04-01 00:54:16 -08002016 struct xfrm_state *x = skb->sp->xvec[i];
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002017 if (!xfrm_selector_match(&x->sel, &fl, family)) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002018 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002019 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002020 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021 }
2022 }
2023
2024 pol = NULL;
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05002025 if (sk && sk->sk_policy[dir]) {
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07002026 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002027 if (IS_ERR(pol)) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002028 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05002029 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002030 }
Venkat Yekkirala3bccfbc2006-10-05 15:42:35 -05002031 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032
Timo Teräsfe1a5f02010-04-07 00:30:04 +00002033 if (!pol) {
2034 struct flow_cache_object *flo;
2035
2036 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2037 xfrm_policy_lookup, NULL);
2038 if (IS_ERR_OR_NULL(flo))
2039 pol = ERR_CAST(flo);
2040 else
2041 pol = container_of(flo, struct xfrm_policy, flo);
2042 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002044 if (IS_ERR(pol)) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002045 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
James Morris134b0fc2006-10-05 15:42:27 -05002046 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002047 }
James Morris134b0fc2006-10-05 15:42:27 -05002048
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002049 if (!pol) {
James Morrisd1d9fac2006-09-01 00:32:12 -07002050 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002051 xfrm_secpath_reject(xerr_idx, skb, &fl);
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002052 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002053 return 0;
2054 }
2055 return 1;
2056 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057
James Morris9d729f72007-03-04 16:12:44 -08002058 pol->curlft.use_time = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002060 pols[0] = pol;
2061 npols ++;
2062#ifdef CONFIG_XFRM_SUB_POLICY
2063 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
Alexey Dobriyanf6e1e252008-11-25 17:35:44 -08002064 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002065 &fl, family,
2066 XFRM_POLICY_IN);
2067 if (pols[1]) {
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002068 if (IS_ERR(pols[1])) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002069 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
James Morris134b0fc2006-10-05 15:42:27 -05002070 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002071 }
James Morris9d729f72007-03-04 16:12:44 -08002072 pols[1]->curlft.use_time = get_seconds();
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002073 npols ++;
2074 }
2075 }
2076#endif
2077
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078 if (pol->action == XFRM_POLICY_ALLOW) {
2079 struct sec_path *sp;
2080 static struct sec_path dummy;
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002081 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07002082 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002083 struct xfrm_tmpl **tpp = tp;
2084 int ti = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 int i, k;
2086
2087 if ((sp = skb->sp) == NULL)
2088 sp = &dummy;
2089
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002090 for (pi = 0; pi < npols; pi++) {
2091 if (pols[pi] != pol &&
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002092 pols[pi]->action != XFRM_POLICY_ALLOW) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002093 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002094 goto reject;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002095 }
2096 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002097 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002098 goto reject_error;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002099 }
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002100 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2101 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2102 }
2103 xfrm_nr = ti;
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07002104 if (npols > 1) {
2105 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2106 tpp = stp;
2107 }
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002108
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109 /* For each tunnel xfrm, find the first matching tmpl.
2110 * For each tmpl before that, find corresponding xfrm.
2111 * Order is _important_. Later we will implement
2112 * some barriers, but at the moment barriers
2113 * are implied between each two transformations.
2114 */
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002115 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2116 k = xfrm_policy_ok(tpp[i], sp, k, family);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002117 if (k < 0) {
James Morrisd1d9fac2006-09-01 00:32:12 -07002118 if (k < -1)
2119 /* "-2 - errored_index" returned */
2120 xerr_idx = -(2+k);
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002121 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122 goto reject;
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002123 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124 }
2125
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002126 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002127 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002128 goto reject;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002129 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002130
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002131 xfrm_pols_put(pols, npols);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002132 return 1;
2133 }
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002134 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135
2136reject:
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -07002137 xfrm_secpath_reject(xerr_idx, skb, &fl);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07002138reject_error:
2139 xfrm_pols_put(pols, npols);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140 return 0;
2141}
2142EXPORT_SYMBOL(__xfrm_policy_check);
2143
2144int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2145{
Alexey Dobriyan99a66652008-11-25 17:36:13 -08002146 struct net *net = dev_net(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147 struct flowi fl;
Eric Dumazetadf30902009-06-02 05:19:30 +00002148 struct dst_entry *dst;
2149 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002150
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002151 if (xfrm_decode_session(skb, &fl, family) < 0) {
jamal72032fd2010-02-18 03:35:07 +00002152 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002153 return 0;
Masahide NAKAMURA0aa64772007-12-20 20:43:36 -08002154 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155
Eric Dumazetfafeeb62010-06-01 10:04:49 +00002156 skb_dst_force(skb);
Eric Dumazetadf30902009-06-02 05:19:30 +00002157 dst = skb_dst(skb);
2158
2159 res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0;
2160 skb_dst_set(skb, dst);
2161 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002162}
2163EXPORT_SYMBOL(__xfrm_route_forward);
2164
David S. Millerd49c73c2006-08-13 18:55:53 -07002165/* Optimize later using cookies and generation ids. */
2166
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2168{
David S. Millerd49c73c2006-08-13 18:55:53 -07002169 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2170 * to "-1" to force all XFRM destinations to get validated by
2171 * dst_ops->check on every use. We do this because when a
2172 * normal route referenced by an XFRM dst is obsoleted we do
2173 * not go looking around for all parent referencing XFRM dsts
2174 * so that we can invalidate them. It is just too much work.
2175 * Instead we make the checks here on every use. For example:
2176 *
2177 * XFRM dst A --> IPv4 dst X
2178 *
2179 * X is the "xdst->route" of A (X is also the "dst->path" of A
2180 * in this example). If X is marked obsolete, "A" will not
2181 * notice. That's what we are validating here via the
2182 * stale_bundle() check.
2183 *
2184 * When a policy's bundle is pruned, we dst_free() the XFRM
2185 * dst which causes it's ->obsolete field to be set to a
2186 * positive non-zero integer. If an XFRM dst has been pruned
2187 * like this, we want to force a new route lookup.
David S. Miller399c1802005-12-19 14:23:23 -08002188 */
David S. Millerd49c73c2006-08-13 18:55:53 -07002189 if (dst->obsolete < 0 && !stale_bundle(dst))
2190 return dst;
2191
Linus Torvalds1da177e2005-04-16 15:20:36 -07002192 return NULL;
2193}
2194
2195static int stale_bundle(struct dst_entry *dst)
2196{
Venkat Yekkirala5b368e62006-10-05 15:42:18 -05002197 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002198}
2199
Herbert Xuaabc9762005-05-03 16:27:10 -07002200void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002201{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002202 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09002203 dst->dev = dev_net(dev)->loopback_dev;
Daniel Lezcanode3cb742007-09-25 19:16:28 -07002204 dev_hold(dst->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002205 dev_put(dev);
2206 }
2207}
Herbert Xuaabc9762005-05-03 16:27:10 -07002208EXPORT_SYMBOL(xfrm_dst_ifdown);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209
2210static void xfrm_link_failure(struct sk_buff *skb)
2211{
2212 /* Impossible. Such dst must be popped before reaches point of failure. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002213}
2214
2215static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2216{
2217 if (dst) {
2218 if (dst->obsolete) {
2219 dst_release(dst);
2220 dst = NULL;
2221 }
2222 }
2223 return dst;
2224}
2225
Alexey Dobriyanddcfd792008-11-25 17:37:23 -08002226static void __xfrm_garbage_collect(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002227{
Timo Teräs80c802f2010-04-07 00:30:05 +00002228 struct dst_entry *head, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229
Timo Teräs80c802f2010-04-07 00:30:05 +00002230 flow_cache_flush();
2231
2232 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
2233 head = xfrm_policy_sk_bundles;
2234 xfrm_policy_sk_bundles = NULL;
2235 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
2236
2237 while (head) {
2238 next = head->next;
2239 dst_free(head);
2240 head = next;
2241 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242}
2243
Herbert Xu25ee3282007-12-11 09:32:34 -08002244static void xfrm_init_pmtu(struct dst_entry *dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002245{
2246 do {
2247 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2248 u32 pmtu, route_mtu_cached;
2249
2250 pmtu = dst_mtu(dst->child);
2251 xdst->child_mtu_cached = pmtu;
2252
2253 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2254
2255 route_mtu_cached = dst_mtu(xdst->route);
2256 xdst->route_mtu_cached = route_mtu_cached;
2257
2258 if (pmtu > route_mtu_cached)
2259 pmtu = route_mtu_cached;
2260
2261 dst->metrics[RTAX_MTU-1] = pmtu;
2262 } while ((dst = dst->next));
2263}
2264
Linus Torvalds1da177e2005-04-16 15:20:36 -07002265/* Check that the bundle accepts the flow and its components are
2266 * still valid.
2267 */
2268
Venkat Yekkirala5b368e62006-10-05 15:42:18 -05002269int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
2270 struct flowi *fl, int family, int strict)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002271{
2272 struct dst_entry *dst = &first->u.dst;
2273 struct xfrm_dst *last;
2274 u32 mtu;
2275
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -07002276 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07002277 (dst->dev && !netif_running(dst->dev)))
2278 return 0;
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -07002279#ifdef CONFIG_XFRM_SUB_POLICY
2280 if (fl) {
2281 if (first->origin && !flow_cache_uli_match(first->origin, fl))
2282 return 0;
2283 if (first->partner &&
2284 !xfrm_selector_match(first->partner, fl, family))
2285 return 0;
2286 }
2287#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002288
2289 last = NULL;
2290
2291 do {
2292 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2293
2294 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
2295 return 0;
Venkat Yekkirala67f83cb2006-11-08 17:04:26 -06002296 if (fl && pol &&
2297 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07002298 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002299 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2300 return 0;
Timo Teräs80c802f2010-04-07 00:30:05 +00002301 if (xdst->xfrm_genid != dst->xfrm->genid)
2302 return 0;
2303 if (xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
David S. Miller9d4a7062006-08-24 03:18:09 -07002304 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002305
Herbert Xu1bfcb102007-10-17 21:31:50 -07002306 if (strict && fl &&
Herbert Xu13996372007-10-17 21:35:51 -07002307 !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
Masahide NAKAMURAe53820d2006-08-23 19:12:01 -07002308 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
2309 return 0;
2310
Linus Torvalds1da177e2005-04-16 15:20:36 -07002311 mtu = dst_mtu(dst->child);
2312 if (xdst->child_mtu_cached != mtu) {
2313 last = xdst;
2314 xdst->child_mtu_cached = mtu;
2315 }
2316
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -07002317 if (!dst_check(xdst->route, xdst->route_cookie))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318 return 0;
2319 mtu = dst_mtu(xdst->route);
2320 if (xdst->route_mtu_cached != mtu) {
2321 last = xdst;
2322 xdst->route_mtu_cached = mtu;
2323 }
2324
2325 dst = dst->child;
2326 } while (dst->xfrm);
2327
2328 if (likely(!last))
2329 return 1;
2330
2331 mtu = last->child_mtu_cached;
2332 for (;;) {
2333 dst = &last->u.dst;
2334
2335 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2336 if (mtu > last->route_mtu_cached)
2337 mtu = last->route_mtu_cached;
2338 dst->metrics[RTAX_MTU-1] = mtu;
2339
2340 if (last == first)
2341 break;
2342
Patrick McHardybd0bf072007-07-18 01:55:52 -07002343 last = (struct xfrm_dst *)last->u.dst.next;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002344 last->child_mtu_cached = mtu;
2345 }
2346
2347 return 1;
2348}
2349
2350EXPORT_SYMBOL(xfrm_bundle_ok);
2351
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2353{
Alexey Dobriyand7c75442010-01-24 22:47:53 -08002354 struct net *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355 int err = 0;
2356 if (unlikely(afinfo == NULL))
2357 return -EINVAL;
2358 if (unlikely(afinfo->family >= NPROTO))
2359 return -EAFNOSUPPORT;
Ingo Molnare959d812006-04-28 15:32:29 -07002360 write_lock_bh(&xfrm_policy_afinfo_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002361 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2362 err = -ENOBUFS;
2363 else {
2364 struct dst_ops *dst_ops = afinfo->dst_ops;
2365 if (likely(dst_ops->kmem_cachep == NULL))
2366 dst_ops->kmem_cachep = xfrm_dst_cache;
2367 if (likely(dst_ops->check == NULL))
2368 dst_ops->check = xfrm_dst_check;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002369 if (likely(dst_ops->negative_advice == NULL))
2370 dst_ops->negative_advice = xfrm_negative_advice;
2371 if (likely(dst_ops->link_failure == NULL))
2372 dst_ops->link_failure = xfrm_link_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373 if (likely(afinfo->garbage_collect == NULL))
2374 afinfo->garbage_collect = __xfrm_garbage_collect;
2375 xfrm_policy_afinfo[afinfo->family] = afinfo;
2376 }
Ingo Molnare959d812006-04-28 15:32:29 -07002377 write_unlock_bh(&xfrm_policy_afinfo_lock);
Alexey Dobriyand7c75442010-01-24 22:47:53 -08002378
2379 rtnl_lock();
2380 for_each_net(net) {
2381 struct dst_ops *xfrm_dst_ops;
2382
2383 switch (afinfo->family) {
2384 case AF_INET:
2385 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2386 break;
2387#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2388 case AF_INET6:
2389 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2390 break;
2391#endif
2392 default:
2393 BUG();
2394 }
2395 *xfrm_dst_ops = *afinfo->dst_ops;
2396 }
2397 rtnl_unlock();
2398
Linus Torvalds1da177e2005-04-16 15:20:36 -07002399 return err;
2400}
2401EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2402
2403int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2404{
2405 int err = 0;
2406 if (unlikely(afinfo == NULL))
2407 return -EINVAL;
2408 if (unlikely(afinfo->family >= NPROTO))
2409 return -EAFNOSUPPORT;
Ingo Molnare959d812006-04-28 15:32:29 -07002410 write_lock_bh(&xfrm_policy_afinfo_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002411 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2412 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2413 err = -EINVAL;
2414 else {
2415 struct dst_ops *dst_ops = afinfo->dst_ops;
2416 xfrm_policy_afinfo[afinfo->family] = NULL;
2417 dst_ops->kmem_cachep = NULL;
2418 dst_ops->check = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419 dst_ops->negative_advice = NULL;
2420 dst_ops->link_failure = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002421 afinfo->garbage_collect = NULL;
2422 }
2423 }
Ingo Molnare959d812006-04-28 15:32:29 -07002424 write_unlock_bh(&xfrm_policy_afinfo_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002425 return err;
2426}
2427EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2428
Alexey Dobriyand7c75442010-01-24 22:47:53 -08002429static void __net_init xfrm_dst_ops_init(struct net *net)
2430{
2431 struct xfrm_policy_afinfo *afinfo;
2432
2433 read_lock_bh(&xfrm_policy_afinfo_lock);
2434 afinfo = xfrm_policy_afinfo[AF_INET];
2435 if (afinfo)
2436 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2437#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2438 afinfo = xfrm_policy_afinfo[AF_INET6];
2439 if (afinfo)
2440 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2441#endif
2442 read_unlock_bh(&xfrm_policy_afinfo_lock);
2443}
2444
Linus Torvalds1da177e2005-04-16 15:20:36 -07002445static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2446{
2447 struct xfrm_policy_afinfo *afinfo;
2448 if (unlikely(family >= NPROTO))
2449 return NULL;
2450 read_lock(&xfrm_policy_afinfo_lock);
2451 afinfo = xfrm_policy_afinfo[family];
Herbert Xu546be242006-05-27 23:03:58 -07002452 if (unlikely(!afinfo))
2453 read_unlock(&xfrm_policy_afinfo_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002454 return afinfo;
2455}
2456
2457static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2458{
Herbert Xu546be242006-05-27 23:03:58 -07002459 read_unlock(&xfrm_policy_afinfo_lock);
2460}
2461
Linus Torvalds1da177e2005-04-16 15:20:36 -07002462static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2463{
Eric W. Biedermane9dc8652007-09-12 13:02:17 +02002464 struct net_device *dev = ptr;
2465
Linus Torvalds1da177e2005-04-16 15:20:36 -07002466 switch (event) {
2467 case NETDEV_DOWN:
Timo Teräs80c802f2010-04-07 00:30:05 +00002468 __xfrm_garbage_collect(dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002469 }
2470 return NOTIFY_DONE;
2471}
2472
2473static struct notifier_block xfrm_dev_notifier = {
Alexey Dobriyand5917a32008-10-31 00:41:59 -07002474 .notifier_call = xfrm_dev_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002475};
2476
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002477#ifdef CONFIG_XFRM_STATISTICS
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002478static int __net_init xfrm_statistics_init(struct net *net)
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002479{
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08002480 int rv;
2481
Tejun Heo7d720c32010-02-16 15:20:26 +00002482 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002483 sizeof(struct linux_xfrm_mib)) < 0)
2484 return -ENOMEM;
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08002485 rv = xfrm_proc_init(net);
2486 if (rv < 0)
Tejun Heo7d720c32010-02-16 15:20:26 +00002487 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08002488 return rv;
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002489}
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002490
2491static void xfrm_statistics_fini(struct net *net)
2492{
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08002493 xfrm_proc_fini(net);
Tejun Heo7d720c32010-02-16 15:20:26 +00002494 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002495}
2496#else
2497static int __net_init xfrm_statistics_init(struct net *net)
2498{
2499 return 0;
2500}
2501
2502static void xfrm_statistics_fini(struct net *net)
2503{
2504}
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08002505#endif
2506
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002507static int __net_init xfrm_policy_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002508{
David S. Miller2518c7c2006-08-24 04:45:07 -07002509 unsigned int hmask, sz;
2510 int dir;
2511
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002512 if (net_eq(net, &init_net))
2513 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002514 sizeof(struct xfrm_dst),
Alexey Dobriyane5d679f2006-08-26 19:25:52 -07002515 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
Paul Mundt20c2df82007-07-20 10:11:58 +09002516 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002517
David S. Miller2518c7c2006-08-24 04:45:07 -07002518 hmask = 8 - 1;
2519 sz = (hmask+1) * sizeof(struct hlist_head);
2520
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002521 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2522 if (!net->xfrm.policy_byidx)
2523 goto out_byidx;
Alexey Dobriyan8100bea2008-11-25 17:22:58 -08002524 net->xfrm.policy_idx_hmask = hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -07002525
2526 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2527 struct xfrm_policy_hash *htab;
2528
Alexey Dobriyandc2caba2008-11-25 17:24:15 -08002529 net->xfrm.policy_count[dir] = 0;
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002530 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
David S. Miller2518c7c2006-08-24 04:45:07 -07002531
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002532 htab = &net->xfrm.policy_bydst[dir];
David S. Miller44e36b42006-08-24 04:50:50 -07002533 htab->table = xfrm_hash_alloc(sz);
David S. Miller2518c7c2006-08-24 04:45:07 -07002534 if (!htab->table)
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002535 goto out_bydst;
2536 htab->hmask = hmask;
David S. Miller2518c7c2006-08-24 04:45:07 -07002537 }
2538
Alexey Dobriyanadfcf0b2008-11-25 17:22:11 -08002539 INIT_LIST_HEAD(&net->xfrm.policy_all);
Alexey Dobriyan66caf622008-11-25 17:28:57 -08002540 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002541 if (net_eq(net, &init_net))
2542 register_netdevice_notifier(&xfrm_dev_notifier);
2543 return 0;
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002544
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002545out_bydst:
2546 for (dir--; dir >= 0; dir--) {
2547 struct xfrm_policy_hash *htab;
2548
2549 htab = &net->xfrm.policy_bydst[dir];
2550 xfrm_hash_free(htab->table, sz);
2551 }
2552 xfrm_hash_free(net->xfrm.policy_byidx, sz);
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002553out_byidx:
2554 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002555}
2556
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002557static void xfrm_policy_fini(struct net *net)
2558{
Alexey Dobriyan7c2776e2008-11-25 17:57:44 -08002559 struct xfrm_audit audit_info;
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002560 unsigned int sz;
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002561 int dir;
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002562
Alexey Dobriyan7c2776e2008-11-25 17:57:44 -08002563 flush_work(&net->xfrm.policy_hash_work);
2564#ifdef CONFIG_XFRM_SUB_POLICY
2565 audit_info.loginuid = -1;
2566 audit_info.sessionid = -1;
2567 audit_info.secid = 0;
2568 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2569#endif
2570 audit_info.loginuid = -1;
2571 audit_info.sessionid = -1;
2572 audit_info.secid = 0;
2573 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
Alexey Dobriyan7c2776e2008-11-25 17:57:44 -08002574
Alexey Dobriyanadfcf0b2008-11-25 17:22:11 -08002575 WARN_ON(!list_empty(&net->xfrm.policy_all));
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002576
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002577 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002578 struct xfrm_policy_hash *htab;
2579
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002580 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
Alexey Dobriyana35f6c52008-11-25 17:23:48 -08002581
2582 htab = &net->xfrm.policy_bydst[dir];
2583 sz = (htab->hmask + 1);
2584 WARN_ON(!hlist_empty(htab->table));
2585 xfrm_hash_free(htab->table, sz);
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002586 }
2587
Alexey Dobriyan8100bea2008-11-25 17:22:58 -08002588 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
Alexey Dobriyan93b851c2008-11-25 17:22:35 -08002589 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2590 xfrm_hash_free(net->xfrm.policy_byidx, sz);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002591}
2592
2593static int __net_init xfrm_net_init(struct net *net)
2594{
2595 int rv;
2596
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002597 rv = xfrm_statistics_init(net);
2598 if (rv < 0)
2599 goto out_statistics;
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002600 rv = xfrm_state_init(net);
2601 if (rv < 0)
2602 goto out_state;
2603 rv = xfrm_policy_init(net);
2604 if (rv < 0)
2605 goto out_policy;
Alexey Dobriyand7c75442010-01-24 22:47:53 -08002606 xfrm_dst_ops_init(net);
Alexey Dobriyanb27aead2008-11-25 18:00:48 -08002607 rv = xfrm_sysctl_init(net);
2608 if (rv < 0)
2609 goto out_sysctl;
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002610 return 0;
2611
Alexey Dobriyanb27aead2008-11-25 18:00:48 -08002612out_sysctl:
2613 xfrm_policy_fini(net);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002614out_policy:
2615 xfrm_state_fini(net);
2616out_state:
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002617 xfrm_statistics_fini(net);
2618out_statistics:
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002619 return rv;
2620}
2621
2622static void __net_exit xfrm_net_exit(struct net *net)
2623{
Alexey Dobriyanb27aead2008-11-25 18:00:48 -08002624 xfrm_sysctl_fini(net);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002625 xfrm_policy_fini(net);
2626 xfrm_state_fini(net);
Alexey Dobriyan59c99402008-11-25 17:59:52 -08002627 xfrm_statistics_fini(net);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002628}
2629
2630static struct pernet_operations __net_initdata xfrm_net_ops = {
2631 .init = xfrm_net_init,
2632 .exit = xfrm_net_exit,
2633};
2634
Linus Torvalds1da177e2005-04-16 15:20:36 -07002635void __init xfrm_init(void)
2636{
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08002637 register_pernet_subsys(&xfrm_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002638 xfrm_input_init();
2639}
2640
Joy Lattenab5f5e82007-09-17 11:51:22 -07002641#ifdef CONFIG_AUDITSYSCALL
Ilpo Järvinen1486cbd2008-01-12 03:20:03 -08002642static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2643 struct audit_buffer *audit_buf)
Joy Lattenab5f5e82007-09-17 11:51:22 -07002644{
Paul Moore875179f2007-12-01 23:27:18 +11002645 struct xfrm_sec_ctx *ctx = xp->security;
2646 struct xfrm_selector *sel = &xp->selector;
Joy Lattenab5f5e82007-09-17 11:51:22 -07002647
Paul Moore875179f2007-12-01 23:27:18 +11002648 if (ctx)
2649 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2650 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2651
2652 switch(sel->family) {
Joy Lattenab5f5e82007-09-17 11:51:22 -07002653 case AF_INET:
Harvey Harrison21454aa2008-10-31 00:54:56 -07002654 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
Paul Moore875179f2007-12-01 23:27:18 +11002655 if (sel->prefixlen_s != 32)
2656 audit_log_format(audit_buf, " src_prefixlen=%d",
2657 sel->prefixlen_s);
Harvey Harrison21454aa2008-10-31 00:54:56 -07002658 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
Paul Moore875179f2007-12-01 23:27:18 +11002659 if (sel->prefixlen_d != 32)
2660 audit_log_format(audit_buf, " dst_prefixlen=%d",
2661 sel->prefixlen_d);
Joy Lattenab5f5e82007-09-17 11:51:22 -07002662 break;
2663 case AF_INET6:
Harvey Harrison5b095d9892008-10-29 12:52:50 -07002664 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
Paul Moore875179f2007-12-01 23:27:18 +11002665 if (sel->prefixlen_s != 128)
2666 audit_log_format(audit_buf, " src_prefixlen=%d",
2667 sel->prefixlen_s);
Harvey Harrison5b095d9892008-10-29 12:52:50 -07002668 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
Paul Moore875179f2007-12-01 23:27:18 +11002669 if (sel->prefixlen_d != 128)
2670 audit_log_format(audit_buf, " dst_prefixlen=%d",
2671 sel->prefixlen_d);
Joy Lattenab5f5e82007-09-17 11:51:22 -07002672 break;
2673 }
2674}
2675
Paul Moore68277ac2007-12-20 20:49:33 -08002676void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
Eric Paris25323862008-04-18 10:09:25 -04002677 uid_t auid, u32 sessionid, u32 secid)
Joy Lattenab5f5e82007-09-17 11:51:22 -07002678{
2679 struct audit_buffer *audit_buf;
Joy Lattenab5f5e82007-09-17 11:51:22 -07002680
Paul Mooreafeb14b2007-12-21 14:58:11 -08002681 audit_buf = xfrm_audit_start("SPD-add");
Joy Lattenab5f5e82007-09-17 11:51:22 -07002682 if (audit_buf == NULL)
2683 return;
Eric Paris25323862008-04-18 10:09:25 -04002684 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
Paul Mooreafeb14b2007-12-21 14:58:11 -08002685 audit_log_format(audit_buf, " res=%u", result);
Joy Lattenab5f5e82007-09-17 11:51:22 -07002686 xfrm_audit_common_policyinfo(xp, audit_buf);
2687 audit_log_end(audit_buf);
2688}
2689EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2690
Paul Moore68277ac2007-12-20 20:49:33 -08002691void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
Eric Paris25323862008-04-18 10:09:25 -04002692 uid_t auid, u32 sessionid, u32 secid)
Joy Lattenab5f5e82007-09-17 11:51:22 -07002693{
2694 struct audit_buffer *audit_buf;
Joy Lattenab5f5e82007-09-17 11:51:22 -07002695
Paul Mooreafeb14b2007-12-21 14:58:11 -08002696 audit_buf = xfrm_audit_start("SPD-delete");
Joy Lattenab5f5e82007-09-17 11:51:22 -07002697 if (audit_buf == NULL)
2698 return;
Eric Paris25323862008-04-18 10:09:25 -04002699 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
Paul Mooreafeb14b2007-12-21 14:58:11 -08002700 audit_log_format(audit_buf, " res=%u", result);
Joy Lattenab5f5e82007-09-17 11:51:22 -07002701 xfrm_audit_common_policyinfo(xp, audit_buf);
2702 audit_log_end(audit_buf);
2703}
2704EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2705#endif
2706
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002707#ifdef CONFIG_XFRM_MIGRATE
2708static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2709 struct xfrm_selector *sel_tgt)
2710{
2711 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2712 if (sel_tgt->family == sel_cmp->family &&
2713 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
YOSHIFUJI Hideakia716c112007-02-09 23:25:29 +09002714 sel_cmp->family) == 0 &&
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002715 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2716 sel_cmp->family) == 0 &&
2717 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2718 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2719 return 1;
2720 }
2721 } else {
2722 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2723 return 1;
2724 }
2725 }
2726 return 0;
2727}
2728
2729static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2730 u8 dir, u8 type)
2731{
2732 struct xfrm_policy *pol, *ret = NULL;
2733 struct hlist_node *entry;
2734 struct hlist_head *chain;
2735 u32 priority = ~0U;
2736
2737 read_lock_bh(&xfrm_policy_lock);
Alexey Dobriyan11219942008-11-25 17:33:06 -08002738 chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002739 hlist_for_each_entry(pol, entry, chain, bydst) {
2740 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2741 pol->type == type) {
2742 ret = pol;
2743 priority = ret->priority;
2744 break;
2745 }
2746 }
Alexey Dobriyan8b18f8e2008-11-25 17:23:26 -08002747 chain = &init_net.xfrm.policy_inexact[dir];
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002748 hlist_for_each_entry(pol, entry, chain, bydst) {
2749 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2750 pol->type == type &&
2751 pol->priority < priority) {
2752 ret = pol;
2753 break;
2754 }
2755 }
2756
2757 if (ret)
2758 xfrm_pol_hold(ret);
2759
2760 read_unlock_bh(&xfrm_policy_lock);
2761
2762 return ret;
2763}
2764
2765static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2766{
2767 int match = 0;
2768
2769 if (t->mode == m->mode && t->id.proto == m->proto &&
2770 (m->reqid == 0 || t->reqid == m->reqid)) {
2771 switch (t->mode) {
2772 case XFRM_MODE_TUNNEL:
2773 case XFRM_MODE_BEET:
2774 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2775 m->old_family) == 0 &&
2776 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2777 m->old_family) == 0) {
2778 match = 1;
2779 }
2780 break;
2781 case XFRM_MODE_TRANSPORT:
2782 /* in case of transport mode, template does not store
2783 any IP addresses, hence we just compare mode and
2784 protocol */
2785 match = 1;
2786 break;
2787 default:
2788 break;
2789 }
2790 }
2791 return match;
2792}
2793
2794/* update endpoint address(es) of template(s) */
2795static int xfrm_policy_migrate(struct xfrm_policy *pol,
2796 struct xfrm_migrate *m, int num_migrate)
2797{
2798 struct xfrm_migrate *mp;
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002799 int i, j, n = 0;
2800
2801 write_lock_bh(&pol->lock);
Herbert Xu12a169e2008-10-01 07:03:24 -07002802 if (unlikely(pol->walk.dead)) {
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002803 /* target policy has been deleted */
2804 write_unlock_bh(&pol->lock);
2805 return -ENOENT;
2806 }
2807
2808 for (i = 0; i < pol->xfrm_nr; i++) {
2809 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2810 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2811 continue;
2812 n++;
Herbert Xu1bfcb102007-10-17 21:31:50 -07002813 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2814 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002815 continue;
2816 /* update endpoints */
2817 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2818 sizeof(pol->xfrm_vec[i].id.daddr));
2819 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2820 sizeof(pol->xfrm_vec[i].saddr));
2821 pol->xfrm_vec[i].encap_family = mp->new_family;
2822 /* flush bundles */
Timo Teräs80c802f2010-04-07 00:30:05 +00002823 atomic_inc(&pol->genid);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002824 }
2825 }
2826
2827 write_unlock_bh(&pol->lock);
2828
2829 if (!n)
2830 return -ENODATA;
2831
2832 return 0;
2833}
2834
2835static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2836{
2837 int i, j;
2838
2839 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2840 return -EINVAL;
2841
2842 for (i = 0; i < num_migrate; i++) {
2843 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2844 m[i].old_family) == 0) &&
2845 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2846 m[i].old_family) == 0))
2847 return -EINVAL;
2848 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2849 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2850 return -EINVAL;
2851
2852 /* check if there is any duplicated entry */
2853 for (j = i + 1; j < num_migrate; j++) {
2854 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2855 sizeof(m[i].old_daddr)) &&
2856 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2857 sizeof(m[i].old_saddr)) &&
2858 m[i].proto == m[j].proto &&
2859 m[i].mode == m[j].mode &&
2860 m[i].reqid == m[j].reqid &&
2861 m[i].old_family == m[j].old_family)
2862 return -EINVAL;
2863 }
2864 }
2865
2866 return 0;
2867}
2868
2869int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
Arnaud Ebalard13c1d182008-10-05 13:33:42 -07002870 struct xfrm_migrate *m, int num_migrate,
2871 struct xfrm_kmaddress *k)
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002872{
2873 int i, err, nx_cur = 0, nx_new = 0;
2874 struct xfrm_policy *pol = NULL;
2875 struct xfrm_state *x, *xc;
2876 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2877 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2878 struct xfrm_migrate *mp;
2879
2880 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2881 goto out;
2882
2883 /* Stage 1 - find policy */
2884 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2885 err = -ENOENT;
2886 goto out;
2887 }
2888
2889 /* Stage 2 - find and update state(s) */
2890 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2891 if ((x = xfrm_migrate_state_find(mp))) {
2892 x_cur[nx_cur] = x;
2893 nx_cur++;
2894 if ((xc = xfrm_state_migrate(x, mp))) {
2895 x_new[nx_new] = xc;
2896 nx_new++;
2897 } else {
2898 err = -ENODATA;
2899 goto restore_state;
2900 }
2901 }
2902 }
2903
2904 /* Stage 3 - update policy */
2905 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2906 goto restore_state;
2907
2908 /* Stage 4 - delete old state(s) */
2909 if (nx_cur) {
2910 xfrm_states_put(x_cur, nx_cur);
2911 xfrm_states_delete(x_cur, nx_cur);
2912 }
2913
2914 /* Stage 5 - announce */
Arnaud Ebalard13c1d182008-10-05 13:33:42 -07002915 km_migrate(sel, dir, type, m, num_migrate, k);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002916
2917 xfrm_pol_put(pol);
2918
2919 return 0;
2920out:
2921 return err;
2922
2923restore_state:
2924 if (pol)
2925 xfrm_pol_put(pol);
2926 if (nx_cur)
2927 xfrm_states_put(x_cur, nx_cur);
2928 if (nx_new)
2929 xfrm_states_delete(x_new, nx_new);
2930
2931 return err;
2932}
David S. Millere610e672007-02-08 13:29:15 -08002933EXPORT_SYMBOL(xfrm_migrate);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08002934#endif