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a716c119 1/*
1da177e4
LT
2 * 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
df71837d 13 *
1da177e4
LT
14 */
15
66cdb3ca 16#include <linux/err.h>
1da177e4
LT
17#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>
eb9c7ebe 24#include <linux/netfilter.h>
1da177e4 25#include <linux/module.h>
2518c7c2 26#include <linux/cache.h>
68277acc 27#include <linux/audit.h>
25ee3286 28#include <net/dst.h>
1da177e4
LT
29#include <net/xfrm.h>
30#include <net/ip.h>
558f82ef
MN
31#ifdef CONFIG_XFRM_STATISTICS
32#include <net/snmp.h>
33#endif
1da177e4 34
44e36b42
DM
35#include "xfrm_hash.h"
36
28faa979 37int sysctl_xfrm_larval_drop __read_mostly = 1;
14e50e57 38
558f82ef
MN
39#ifdef CONFIG_XFRM_STATISTICS
40DEFINE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics) __read_mostly;
41EXPORT_SYMBOL(xfrm_statistics);
42#endif
43
4a3e2f71
AV
44DEFINE_MUTEX(xfrm_cfg_mutex);
45EXPORT_SYMBOL(xfrm_cfg_mutex);
1da177e4
LT
46
47static DEFINE_RWLOCK(xfrm_policy_lock);
48
1da177e4
LT
49static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
50static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
51
e18b890b 52static struct kmem_cache *xfrm_dst_cache __read_mostly;
1da177e4 53
2518c7c2 54static HLIST_HEAD(xfrm_policy_gc_list);
1da177e4
LT
55static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
56
57static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
58static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
25ee3286 59static void xfrm_init_pmtu(struct dst_entry *dst);
1da177e4 60
77681021
AM
61static inline int
62__xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
63{
64 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
65 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
66 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
67 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
68 (fl->proto == sel->proto || !sel->proto) &&
69 (fl->oif == sel->ifindex || !sel->ifindex);
70}
71
72static inline int
73__xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
74{
75 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
76 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
77 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
78 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
79 (fl->proto == sel->proto || !sel->proto) &&
80 (fl->oif == sel->ifindex || !sel->ifindex);
81}
82
83int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
84 unsigned short family)
85{
86 switch (family) {
87 case AF_INET:
88 return __xfrm4_selector_match(sel, fl);
89 case AF_INET6:
90 return __xfrm6_selector_match(sel, fl);
91 }
92 return 0;
93}
94
c5b3cf46 95static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
9bb182a7
YH
96 xfrm_address_t *saddr,
97 xfrm_address_t *daddr,
98 int family)
99{
100 struct xfrm_policy_afinfo *afinfo;
101 struct dst_entry *dst;
102
103 afinfo = xfrm_policy_get_afinfo(family);
104 if (unlikely(afinfo == NULL))
105 return ERR_PTR(-EAFNOSUPPORT);
106
c5b3cf46 107 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
9bb182a7
YH
108
109 xfrm_policy_put_afinfo(afinfo);
110
111 return dst;
112}
113
25ee3286 114static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
9bb182a7
YH
115 xfrm_address_t *prev_saddr,
116 xfrm_address_t *prev_daddr,
25ee3286 117 int family)
1da177e4 118{
c5b3cf46 119 struct net *net = xs_net(x);
66cdb3ca
HX
120 xfrm_address_t *saddr = &x->props.saddr;
121 xfrm_address_t *daddr = &x->id.daddr;
66cdb3ca
HX
122 struct dst_entry *dst;
123
9bb182a7 124 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
66cdb3ca 125 saddr = x->coaddr;
9bb182a7
YH
126 daddr = prev_daddr;
127 }
128 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
129 saddr = prev_saddr;
66cdb3ca 130 daddr = x->coaddr;
9bb182a7 131 }
1da177e4 132
c5b3cf46 133 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
9bb182a7
YH
134
135 if (!IS_ERR(dst)) {
136 if (prev_saddr != saddr)
137 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
138 if (prev_daddr != daddr)
139 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
140 }
1da177e4 141
66cdb3ca 142 return dst;
1da177e4 143}
1da177e4 144
1da177e4
LT
145static inline unsigned long make_jiffies(long secs)
146{
147 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
148 return MAX_SCHEDULE_TIMEOUT-1;
149 else
a716c119 150 return secs*HZ;
1da177e4
LT
151}
152
153static void xfrm_policy_timer(unsigned long data)
154{
155 struct xfrm_policy *xp = (struct xfrm_policy*)data;
9d729f72 156 unsigned long now = get_seconds();
1da177e4
LT
157 long next = LONG_MAX;
158 int warn = 0;
159 int dir;
160
161 read_lock(&xp->lock);
162
12a169e7 163 if (xp->walk.dead)
1da177e4
LT
164 goto out;
165
77d8d7a6 166 dir = xfrm_policy_id2dir(xp->index);
1da177e4
LT
167
168 if (xp->lft.hard_add_expires_seconds) {
169 long tmo = xp->lft.hard_add_expires_seconds +
170 xp->curlft.add_time - now;
171 if (tmo <= 0)
172 goto expired;
173 if (tmo < next)
174 next = tmo;
175 }
176 if (xp->lft.hard_use_expires_seconds) {
177 long tmo = xp->lft.hard_use_expires_seconds +
178 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
179 if (tmo <= 0)
180 goto expired;
181 if (tmo < next)
182 next = tmo;
183 }
184 if (xp->lft.soft_add_expires_seconds) {
185 long tmo = xp->lft.soft_add_expires_seconds +
186 xp->curlft.add_time - now;
187 if (tmo <= 0) {
188 warn = 1;
189 tmo = XFRM_KM_TIMEOUT;
190 }
191 if (tmo < next)
192 next = tmo;
193 }
194 if (xp->lft.soft_use_expires_seconds) {
195 long tmo = xp->lft.soft_use_expires_seconds +
196 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
197 if (tmo <= 0) {
198 warn = 1;
199 tmo = XFRM_KM_TIMEOUT;
200 }
201 if (tmo < next)
202 next = tmo;
203 }
204
205 if (warn)
6c5c8ca7 206 km_policy_expired(xp, dir, 0, 0);
1da177e4
LT
207 if (next != LONG_MAX &&
208 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
209 xfrm_pol_hold(xp);
210
211out:
212 read_unlock(&xp->lock);
213 xfrm_pol_put(xp);
214 return;
215
216expired:
217 read_unlock(&xp->lock);
4666faab 218 if (!xfrm_policy_delete(xp, dir))
6c5c8ca7 219 km_policy_expired(xp, dir, 1, 0);
1da177e4
LT
220 xfrm_pol_put(xp);
221}
222
223
224/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
225 * SPD calls.
226 */
227
0331b1f3 228struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
1da177e4
LT
229{
230 struct xfrm_policy *policy;
231
0da974f4 232 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
1da177e4
LT
233
234 if (policy) {
0331b1f3 235 write_pnet(&policy->xp_net, net);
12a169e7 236 INIT_LIST_HEAD(&policy->walk.all);
2518c7c2
DM
237 INIT_HLIST_NODE(&policy->bydst);
238 INIT_HLIST_NODE(&policy->byidx);
1da177e4 239 rwlock_init(&policy->lock);
2518c7c2 240 atomic_set(&policy->refcnt, 1);
b24b8a24
PE
241 setup_timer(&policy->timer, xfrm_policy_timer,
242 (unsigned long)policy);
1da177e4
LT
243 }
244 return policy;
245}
246EXPORT_SYMBOL(xfrm_policy_alloc);
247
248/* Destroy xfrm_policy: descendant resources must be released to this moment. */
249
64c31b3f 250void xfrm_policy_destroy(struct xfrm_policy *policy)
1da177e4 251{
12a169e7 252 BUG_ON(!policy->walk.dead);
1da177e4 253
09a62660 254 BUG_ON(policy->bundles);
1da177e4
LT
255
256 if (del_timer(&policy->timer))
257 BUG();
258
03e1ad7b 259 security_xfrm_policy_free(policy->security);
1da177e4
LT
260 kfree(policy);
261}
64c31b3f 262EXPORT_SYMBOL(xfrm_policy_destroy);
1da177e4
LT
263
264static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
265{
266 struct dst_entry *dst;
267
268 while ((dst = policy->bundles) != NULL) {
269 policy->bundles = dst->next;
270 dst_free(dst);
271 }
272
273 if (del_timer(&policy->timer))
274 atomic_dec(&policy->refcnt);
275
276 if (atomic_read(&policy->refcnt) > 1)
277 flow_cache_flush();
278
279 xfrm_pol_put(policy);
280}
281
c4028958 282static void xfrm_policy_gc_task(struct work_struct *work)
1da177e4
LT
283{
284 struct xfrm_policy *policy;
2518c7c2
DM
285 struct hlist_node *entry, *tmp;
286 struct hlist_head gc_list;
1da177e4
LT
287
288 spin_lock_bh(&xfrm_policy_gc_lock);
2518c7c2
DM
289 gc_list.first = xfrm_policy_gc_list.first;
290 INIT_HLIST_HEAD(&xfrm_policy_gc_list);
1da177e4
LT
291 spin_unlock_bh(&xfrm_policy_gc_lock);
292
2518c7c2 293 hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
1da177e4 294 xfrm_policy_gc_kill(policy);
1da177e4 295}
c9583969 296static DECLARE_WORK(xfrm_policy_gc_work, xfrm_policy_gc_task);
1da177e4
LT
297
298/* Rule must be locked. Release descentant resources, announce
299 * entry dead. The rule must be unlinked from lists to the moment.
300 */
301
302static void xfrm_policy_kill(struct xfrm_policy *policy)
303{
304 int dead;
305
306 write_lock_bh(&policy->lock);
12a169e7
HX
307 dead = policy->walk.dead;
308 policy->walk.dead = 1;
1da177e4
LT
309 write_unlock_bh(&policy->lock);
310
311 if (unlikely(dead)) {
312 WARN_ON(1);
313 return;
314 }
315
bbb770e7 316 spin_lock_bh(&xfrm_policy_gc_lock);
2518c7c2 317 hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
bbb770e7 318 spin_unlock_bh(&xfrm_policy_gc_lock);
1da177e4
LT
319
320 schedule_work(&xfrm_policy_gc_work);
321}
322
2518c7c2
DM
323static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
324
e92303f8 325static inline unsigned int idx_hash(struct net *net, u32 index)
2518c7c2 326{
e92303f8 327 return __idx_hash(index, net->xfrm.policy_idx_hmask);
2518c7c2
DM
328}
329
1121994c 330static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir)
2518c7c2 331{
1121994c 332 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM
333 unsigned int hash = __sel_hash(sel, family, hmask);
334
335 return (hash == hmask + 1 ?
1121994c
AD
336 &net->xfrm.policy_inexact[dir] :
337 net->xfrm.policy_bydst[dir].table + hash);
2518c7c2
DM
338}
339
1121994c 340static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
2518c7c2 341{
1121994c 342 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM
343 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
344
1121994c 345 return net->xfrm.policy_bydst[dir].table + hash;
2518c7c2
DM
346}
347
2518c7c2
DM
348static void xfrm_dst_hash_transfer(struct hlist_head *list,
349 struct hlist_head *ndsttable,
350 unsigned int nhashmask)
351{
b791160b 352 struct hlist_node *entry, *tmp, *entry0 = NULL;
2518c7c2 353 struct xfrm_policy *pol;
b791160b 354 unsigned int h0 = 0;
2518c7c2 355
b791160b 356redo:
2518c7c2
DM
357 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
358 unsigned int h;
359
360 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
361 pol->family, nhashmask);
b791160b
YH
362 if (!entry0) {
363 hlist_del(entry);
364 hlist_add_head(&pol->bydst, ndsttable+h);
365 h0 = h;
366 } else {
367 if (h != h0)
368 continue;
369 hlist_del(entry);
370 hlist_add_after(entry0, &pol->bydst);
371 }
372 entry0 = entry;
373 }
374 if (!hlist_empty(list)) {
375 entry0 = NULL;
376 goto redo;
2518c7c2
DM
377 }
378}
379
380static void xfrm_idx_hash_transfer(struct hlist_head *list,
381 struct hlist_head *nidxtable,
382 unsigned int nhashmask)
383{
384 struct hlist_node *entry, *tmp;
385 struct xfrm_policy *pol;
386
387 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
388 unsigned int h;
389
390 h = __idx_hash(pol->index, nhashmask);
391 hlist_add_head(&pol->byidx, nidxtable+h);
392 }
393}
394
395static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
396{
397 return ((old_hmask + 1) << 1) - 1;
398}
399
66caf628 400static void xfrm_bydst_resize(struct net *net, int dir)
2518c7c2 401{
66caf628 402 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM
403 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
404 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
66caf628 405 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
44e36b42 406 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
2518c7c2
DM
407 int i;
408
409 if (!ndst)
410 return;
411
412 write_lock_bh(&xfrm_policy_lock);
413
414 for (i = hmask; i >= 0; i--)
415 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
416
66caf628
AD
417 net->xfrm.policy_bydst[dir].table = ndst;
418 net->xfrm.policy_bydst[dir].hmask = nhashmask;
2518c7c2
DM
419
420 write_unlock_bh(&xfrm_policy_lock);
421
44e36b42 422 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM
423}
424
66caf628 425static void xfrm_byidx_resize(struct net *net, int total)
2518c7c2 426{
66caf628 427 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM
428 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
429 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
66caf628 430 struct hlist_head *oidx = net->xfrm.policy_byidx;
44e36b42 431 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
2518c7c2
DM
432 int i;
433
434 if (!nidx)
435 return;
436
437 write_lock_bh(&xfrm_policy_lock);
438
439 for (i = hmask; i >= 0; i--)
440 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
441
66caf628
AD
442 net->xfrm.policy_byidx = nidx;
443 net->xfrm.policy_idx_hmask = nhashmask;
2518c7c2
DM
444
445 write_unlock_bh(&xfrm_policy_lock);
446
44e36b42 447 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM
448}
449
66caf628 450static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
2518c7c2 451{
66caf628
AD
452 unsigned int cnt = net->xfrm.policy_count[dir];
453 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
2518c7c2
DM
454
455 if (total)
456 *total += cnt;
457
458 if ((hmask + 1) < xfrm_policy_hashmax &&
459 cnt > hmask)
460 return 1;
461
462 return 0;
463}
464
66caf628 465static inline int xfrm_byidx_should_resize(struct net *net, int total)
2518c7c2 466{
66caf628 467 unsigned int hmask = net->xfrm.policy_idx_hmask;
2518c7c2
DM
468
469 if ((hmask + 1) < xfrm_policy_hashmax &&
470 total > hmask)
471 return 1;
472
473 return 0;
474}
475
5a6d3416 476void xfrm_spd_getinfo(struct xfrmk_spdinfo *si)
ecfd6b18
JHS
477{
478 read_lock_bh(&xfrm_policy_lock);
dc2caba7
AD
479 si->incnt = init_net.xfrm.policy_count[XFRM_POLICY_IN];
480 si->outcnt = init_net.xfrm.policy_count[XFRM_POLICY_OUT];
481 si->fwdcnt = init_net.xfrm.policy_count[XFRM_POLICY_FWD];
482 si->inscnt = init_net.xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
483 si->outscnt = init_net.xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
484 si->fwdscnt = init_net.xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
8100bea7 485 si->spdhcnt = init_net.xfrm.policy_idx_hmask;
ecfd6b18
JHS
486 si->spdhmcnt = xfrm_policy_hashmax;
487 read_unlock_bh(&xfrm_policy_lock);
488}
489EXPORT_SYMBOL(xfrm_spd_getinfo);
2518c7c2 490
ecfd6b18 491static DEFINE_MUTEX(hash_resize_mutex);
66caf628 492static void xfrm_hash_resize(struct work_struct *work)
2518c7c2 493{
66caf628 494 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
2518c7c2
DM
495 int dir, total;
496
497 mutex_lock(&hash_resize_mutex);
498
499 total = 0;
500 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
66caf628
AD
501 if (xfrm_bydst_should_resize(net, dir, &total))
502 xfrm_bydst_resize(net, dir);
2518c7c2 503 }
66caf628
AD
504 if (xfrm_byidx_should_resize(net, total))
505 xfrm_byidx_resize(net, total);
2518c7c2
DM
506
507 mutex_unlock(&hash_resize_mutex);
508}
509
1da177e4
LT
510/* Generate new index... KAME seems to generate them ordered by cost
511 * of an absolute inpredictability of ordering of rules. This will not pass. */
1121994c 512static u32 xfrm_gen_index(struct net *net, int dir)
1da177e4 513{
1da177e4
LT
514 static u32 idx_generator;
515
516 for (;;) {
2518c7c2
DM
517 struct hlist_node *entry;
518 struct hlist_head *list;
519 struct xfrm_policy *p;
520 u32 idx;
521 int found;
522
1da177e4
LT
523 idx = (idx_generator | dir);
524 idx_generator += 8;
525 if (idx == 0)
526 idx = 8;
1121994c 527 list = net->xfrm.policy_byidx + idx_hash(net, idx);
2518c7c2
DM
528 found = 0;
529 hlist_for_each_entry(p, entry, list, byidx) {
530 if (p->index == idx) {
531 found = 1;
1da177e4 532 break;
2518c7c2 533 }
1da177e4 534 }
2518c7c2 535 if (!found)
1da177e4
LT
536 return idx;
537 }
538}
539
2518c7c2
DM
540static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
541{
542 u32 *p1 = (u32 *) s1;
543 u32 *p2 = (u32 *) s2;
544 int len = sizeof(struct xfrm_selector) / sizeof(u32);
545 int i;
546
547 for (i = 0; i < len; i++) {
548 if (p1[i] != p2[i])
549 return 1;
550 }
551
552 return 0;
553}
554
1da177e4
LT
555int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
556{
1121994c 557 struct net *net = xp_net(policy);
2518c7c2
DM
558 struct xfrm_policy *pol;
559 struct xfrm_policy *delpol;
560 struct hlist_head *chain;
a6c7ab55 561 struct hlist_node *entry, *newpos;
9b78a82c 562 struct dst_entry *gc_list;
1da177e4
LT
563
564 write_lock_bh(&xfrm_policy_lock);
1121994c 565 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
2518c7c2
DM
566 delpol = NULL;
567 newpos = NULL;
2518c7c2 568 hlist_for_each_entry(pol, entry, chain, bydst) {
a6c7ab55 569 if (pol->type == policy->type &&
2518c7c2 570 !selector_cmp(&pol->selector, &policy->selector) &&
a6c7ab55
HX
571 xfrm_sec_ctx_match(pol->security, policy->security) &&
572 !WARN_ON(delpol)) {
1da177e4
LT
573 if (excl) {
574 write_unlock_bh(&xfrm_policy_lock);
575 return -EEXIST;
576 }
1da177e4
LT
577 delpol = pol;
578 if (policy->priority > pol->priority)
579 continue;
580 } else if (policy->priority >= pol->priority) {
a6c7ab55 581 newpos = &pol->bydst;
1da177e4
LT
582 continue;
583 }
1da177e4
LT
584 if (delpol)
585 break;
1da177e4
LT
586 }
587 if (newpos)
2518c7c2
DM
588 hlist_add_after(newpos, &policy->bydst);
589 else
590 hlist_add_head(&policy->bydst, chain);
1da177e4 591 xfrm_pol_hold(policy);
1121994c 592 net->xfrm.policy_count[dir]++;
1da177e4 593 atomic_inc(&flow_cache_genid);
2518c7c2
DM
594 if (delpol) {
595 hlist_del(&delpol->bydst);
596 hlist_del(&delpol->byidx);
12a169e7 597 list_del(&delpol->walk.all);
1121994c 598 net->xfrm.policy_count[dir]--;
2518c7c2 599 }
1121994c
AD
600 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir);
601 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
9d729f72 602 policy->curlft.add_time = get_seconds();
1da177e4
LT
603 policy->curlft.use_time = 0;
604 if (!mod_timer(&policy->timer, jiffies + HZ))
605 xfrm_pol_hold(policy);
1121994c 606 list_add(&policy->walk.all, &net->xfrm.policy_all);
1da177e4
LT
607 write_unlock_bh(&xfrm_policy_lock);
608
9b78a82c 609 if (delpol)
1da177e4 610 xfrm_policy_kill(delpol);
1121994c
AD
611 else if (xfrm_bydst_should_resize(net, dir, NULL))
612 schedule_work(&net->xfrm.policy_hash_work);
9b78a82c
DM
613
614 read_lock_bh(&xfrm_policy_lock);
615 gc_list = NULL;
2518c7c2
DM
616 entry = &policy->bydst;
617 hlist_for_each_entry_continue(policy, entry, bydst) {
9b78a82c
DM
618 struct dst_entry *dst;
619
620 write_lock(&policy->lock);
621 dst = policy->bundles;
622 if (dst) {
623 struct dst_entry *tail = dst;
624 while (tail->next)
625 tail = tail->next;
626 tail->next = gc_list;
627 gc_list = dst;
628
629 policy->bundles = NULL;
630 }
631 write_unlock(&policy->lock);
1da177e4 632 }
9b78a82c
DM
633 read_unlock_bh(&xfrm_policy_lock);
634
635 while (gc_list) {
636 struct dst_entry *dst = gc_list;
637
638 gc_list = dst->next;
639 dst_free(dst);
640 }
641
1da177e4
LT
642 return 0;
643}
644EXPORT_SYMBOL(xfrm_policy_insert);
645
8d1211a6 646struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir,
4e81bb83 647 struct xfrm_selector *sel,
ef41aaa0
EP
648 struct xfrm_sec_ctx *ctx, int delete,
649 int *err)
1da177e4 650{
2518c7c2
DM
651 struct xfrm_policy *pol, *ret;
652 struct hlist_head *chain;
653 struct hlist_node *entry;
1da177e4 654
ef41aaa0 655 *err = 0;
1da177e4 656 write_lock_bh(&xfrm_policy_lock);
8d1211a6 657 chain = policy_hash_bysel(net, sel, sel->family, dir);
2518c7c2
DM
658 ret = NULL;
659 hlist_for_each_entry(pol, entry, chain, bydst) {
660 if (pol->type == type &&
661 !selector_cmp(sel, &pol->selector) &&
662 xfrm_sec_ctx_match(ctx, pol->security)) {
1da177e4 663 xfrm_pol_hold(pol);
2518c7c2 664 if (delete) {
03e1ad7b
PM
665 *err = security_xfrm_policy_delete(
666 pol->security);
ef41aaa0
EP
667 if (*err) {
668 write_unlock_bh(&xfrm_policy_lock);
669 return pol;
670 }
2518c7c2
DM
671 hlist_del(&pol->bydst);
672 hlist_del(&pol->byidx);
12a169e7 673 list_del(&pol->walk.all);
8d1211a6 674 net->xfrm.policy_count[dir]--;
2518c7c2
DM
675 }
676 ret = pol;
1da177e4
LT
677 break;
678 }
679 }
680 write_unlock_bh(&xfrm_policy_lock);
681
2518c7c2 682 if (ret && delete) {
1da177e4 683 atomic_inc(&flow_cache_genid);
2518c7c2 684 xfrm_policy_kill(ret);
1da177e4 685 }
2518c7c2 686 return ret;
1da177e4 687}
df71837d 688EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
1da177e4 689
8d1211a6
AD
690struct xfrm_policy *xfrm_policy_byid(struct net *net, u8 type, int dir, u32 id,
691 int delete, int *err)
1da177e4 692{
2518c7c2
DM
693 struct xfrm_policy *pol, *ret;
694 struct hlist_head *chain;
695 struct hlist_node *entry;
1da177e4 696
b5505c6e
HX
697 *err = -ENOENT;
698 if (xfrm_policy_id2dir(id) != dir)
699 return NULL;
700
ef41aaa0 701 *err = 0;
1da177e4 702 write_lock_bh(&xfrm_policy_lock);
8d1211a6 703 chain = net->xfrm.policy_byidx + idx_hash(net, id);
2518c7c2
DM
704 ret = NULL;
705 hlist_for_each_entry(pol, entry, chain, byidx) {
706 if (pol->type == type && pol->index == id) {
1da177e4 707 xfrm_pol_hold(pol);
2518c7c2 708 if (delete) {
03e1ad7b
PM
709 *err = security_xfrm_policy_delete(
710 pol->security);
ef41aaa0
EP
711 if (*err) {
712 write_unlock_bh(&xfrm_policy_lock);
713 return pol;
714 }
2518c7c2
DM
715 hlist_del(&pol->bydst);
716 hlist_del(&pol->byidx);
12a169e7 717 list_del(&pol->walk.all);
8d1211a6 718 net->xfrm.policy_count[dir]--;
2518c7c2
DM
719 }
720 ret = pol;
1da177e4
LT
721 break;
722 }
723 }
724 write_unlock_bh(&xfrm_policy_lock);
725
2518c7c2 726 if (ret && delete) {
1da177e4 727 atomic_inc(&flow_cache_genid);
2518c7c2 728 xfrm_policy_kill(ret);
1da177e4 729 }
2518c7c2 730 return ret;
1da177e4
LT
731}
732EXPORT_SYMBOL(xfrm_policy_byid);
733
4aa2e62c
JL
734#ifdef CONFIG_SECURITY_NETWORK_XFRM
735static inline int
33ffbbd5 736xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
1da177e4 737{
4aa2e62c
JL
738 int dir, err = 0;
739
740 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
741 struct xfrm_policy *pol;
742 struct hlist_node *entry;
743 int i;
744
745 hlist_for_each_entry(pol, entry,
33ffbbd5 746 &net->xfrm.policy_inexact[dir], bydst) {
4aa2e62c
JL
747 if (pol->type != type)
748 continue;
03e1ad7b 749 err = security_xfrm_policy_delete(pol->security);
4aa2e62c 750 if (err) {
ab5f5e8b
JL
751 xfrm_audit_policy_delete(pol, 0,
752 audit_info->loginuid,
2532386f 753 audit_info->sessionid,
ab5f5e8b 754 audit_info->secid);
4aa2e62c
JL
755 return err;
756 }
7dc12d6d 757 }
33ffbbd5 758 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
4aa2e62c 759 hlist_for_each_entry(pol, entry,
33ffbbd5 760 net->xfrm.policy_bydst[dir].table + i,
4aa2e62c
JL
761 bydst) {
762 if (pol->type != type)
763 continue;
03e1ad7b
PM
764 err = security_xfrm_policy_delete(
765 pol->security);
4aa2e62c 766 if (err) {
ab5f5e8b
JL
767 xfrm_audit_policy_delete(pol, 0,
768 audit_info->loginuid,
2532386f 769 audit_info->sessionid,
ab5f5e8b 770 audit_info->secid);
4aa2e62c
JL
771 return err;
772 }
773 }
774 }
775 }
776 return err;
777}
778#else
779static inline int
33ffbbd5 780xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
4aa2e62c
JL
781{
782 return 0;
783}
784#endif
785
33ffbbd5 786int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
4aa2e62c
JL
787{
788 int dir, err = 0;
1da177e4
LT
789
790 write_lock_bh(&xfrm_policy_lock);
4aa2e62c 791
33ffbbd5 792 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
4aa2e62c
JL
793 if (err)
794 goto out;
795
1da177e4 796 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2
DM
797 struct xfrm_policy *pol;
798 struct hlist_node *entry;
ae8c0577 799 int i, killed;
2518c7c2 800
ae8c0577 801 killed = 0;
2518c7c2
DM
802 again1:
803 hlist_for_each_entry(pol, entry,
33ffbbd5 804 &net->xfrm.policy_inexact[dir], bydst) {
2518c7c2
DM
805 if (pol->type != type)
806 continue;
807 hlist_del(&pol->bydst);
808 hlist_del(&pol->byidx);
1da177e4
LT
809 write_unlock_bh(&xfrm_policy_lock);
810
ab5f5e8b 811 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
2532386f 812 audit_info->sessionid,
ab5f5e8b 813 audit_info->secid);
161a09e7 814
2518c7c2 815 xfrm_policy_kill(pol);
ae8c0577 816 killed++;
1da177e4
LT
817
818 write_lock_bh(&xfrm_policy_lock);
2518c7c2
DM
819 goto again1;
820 }
821
33ffbbd5 822 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
2518c7c2
DM
823 again2:
824 hlist_for_each_entry(pol, entry,
33ffbbd5 825 net->xfrm.policy_bydst[dir].table + i,
2518c7c2
DM
826 bydst) {
827 if (pol->type != type)
828 continue;
829 hlist_del(&pol->bydst);
830 hlist_del(&pol->byidx);
12a169e7 831 list_del(&pol->walk.all);
2518c7c2
DM
832 write_unlock_bh(&xfrm_policy_lock);
833
ab5f5e8b
JL
834 xfrm_audit_policy_delete(pol, 1,
835 audit_info->loginuid,
2532386f 836 audit_info->sessionid,
ab5f5e8b 837 audit_info->secid);
2518c7c2 838 xfrm_policy_kill(pol);
ae8c0577 839 killed++;
2518c7c2
DM
840
841 write_lock_bh(&xfrm_policy_lock);
842 goto again2;
843 }
1da177e4 844 }
2518c7c2 845
33ffbbd5 846 net->xfrm.policy_count[dir] -= killed;
1da177e4
LT
847 }
848 atomic_inc(&flow_cache_genid);
4aa2e62c 849out:
1da177e4 850 write_unlock_bh(&xfrm_policy_lock);
4aa2e62c 851 return err;
1da177e4
LT
852}
853EXPORT_SYMBOL(xfrm_policy_flush);
854
cdcbca7c 855int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
4c563f76 856 int (*func)(struct xfrm_policy *, int, int, void*),
1da177e4
LT
857 void *data)
858{
12a169e7
HX
859 struct xfrm_policy *pol;
860 struct xfrm_policy_walk_entry *x;
4c563f76
TT
861 int error = 0;
862
863 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
864 walk->type != XFRM_POLICY_TYPE_ANY)
865 return -EINVAL;
1da177e4 866
12a169e7 867 if (list_empty(&walk->walk.all) && walk->seq != 0)
4c563f76
TT
868 return 0;
869
12a169e7
HX
870 write_lock_bh(&xfrm_policy_lock);
871 if (list_empty(&walk->walk.all))
cdcbca7c 872 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
12a169e7
HX
873 else
874 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
cdcbca7c 875 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
12a169e7 876 if (x->dead)
4c563f76 877 continue;
12a169e7
HX
878 pol = container_of(x, struct xfrm_policy, walk);
879 if (walk->type != XFRM_POLICY_TYPE_ANY &&
880 walk->type != pol->type)
881 continue;
882 error = func(pol, xfrm_policy_id2dir(pol->index),
883 walk->seq, data);
884 if (error) {
885 list_move_tail(&walk->walk.all, &x->all);
886 goto out;
2518c7c2 887 }
12a169e7 888 walk->seq++;
1da177e4 889 }
12a169e7 890 if (walk->seq == 0) {
baf5d743
JHS
891 error = -ENOENT;
892 goto out;
893 }
12a169e7 894 list_del_init(&walk->walk.all);
1da177e4 895out:
12a169e7 896 write_unlock_bh(&xfrm_policy_lock);
1da177e4
LT
897 return error;
898}
899EXPORT_SYMBOL(xfrm_policy_walk);
900
12a169e7
HX
901void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
902{
903 INIT_LIST_HEAD(&walk->walk.all);
904 walk->walk.dead = 1;
905 walk->type = type;
906 walk->seq = 0;
907}
908EXPORT_SYMBOL(xfrm_policy_walk_init);
909
910void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
911{
912 if (list_empty(&walk->walk.all))
913 return;
914
915 write_lock_bh(&xfrm_policy_lock);
916 list_del(&walk->walk.all);
917 write_unlock_bh(&xfrm_policy_lock);
918}
919EXPORT_SYMBOL(xfrm_policy_walk_done);
920
134b0fc5
JM
921/*
922 * Find policy to apply to this flow.
923 *
924 * Returns 0 if policy found, else an -errno.
925 */
2518c7c2
DM
926static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
927 u8 type, u16 family, int dir)
1da177e4 928{
2518c7c2 929 struct xfrm_selector *sel = &pol->selector;
134b0fc5 930 int match, ret = -ESRCH;
1da177e4 931
2518c7c2
DM
932 if (pol->family != family ||
933 pol->type != type)
134b0fc5 934 return ret;
1da177e4 935
2518c7c2 936 match = xfrm_selector_match(sel, fl, family);
134b0fc5 937 if (match)
03e1ad7b
PM
938 ret = security_xfrm_policy_lookup(pol->security, fl->secid,
939 dir);
2518c7c2 940
134b0fc5 941 return ret;
2518c7c2 942}
1da177e4 943
52479b62
AD
944static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
945 struct flowi *fl,
2518c7c2
DM
946 u16 family, u8 dir)
947{
134b0fc5 948 int err;
2518c7c2
DM
949 struct xfrm_policy *pol, *ret;
950 xfrm_address_t *daddr, *saddr;
951 struct hlist_node *entry;
952 struct hlist_head *chain;
acba48e1 953 u32 priority = ~0U;
df71837d 954
2518c7c2
DM
955 daddr = xfrm_flowi_daddr(fl, family);
956 saddr = xfrm_flowi_saddr(fl, family);
957 if (unlikely(!daddr || !saddr))
958 return NULL;
959
960 read_lock_bh(&xfrm_policy_lock);
52479b62 961 chain = policy_hash_direct(net, daddr, saddr, family, dir);
2518c7c2
DM
962 ret = NULL;
963 hlist_for_each_entry(pol, entry, chain, bydst) {
134b0fc5
JM
964 err = xfrm_policy_match(pol, fl, type, family, dir);
965 if (err) {
966 if (err == -ESRCH)
967 continue;
968 else {
969 ret = ERR_PTR(err);
970 goto fail;
971 }
972 } else {
2518c7c2 973 ret = pol;
acba48e1 974 priority = ret->priority;
2518c7c2
DM
975 break;
976 }
977 }
52479b62 978 chain = &net->xfrm.policy_inexact[dir];
acba48e1 979 hlist_for_each_entry(pol, entry, chain, bydst) {
134b0fc5
JM
980 err = xfrm_policy_match(pol, fl, type, family, dir);
981 if (err) {
982 if (err == -ESRCH)
983 continue;
984 else {
985 ret = ERR_PTR(err);
986 goto fail;
987 }
988 } else if (pol->priority < priority) {
acba48e1
DM
989 ret = pol;
990 break;
1da177e4
LT
991 }
992 }
acba48e1
DM
993 if (ret)
994 xfrm_pol_hold(ret);
134b0fc5 995fail:
1da177e4 996 read_unlock_bh(&xfrm_policy_lock);
4e81bb83 997
2518c7c2 998 return ret;
4e81bb83
MN
999}
1000
52479b62
AD
1001static int xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family,
1002 u8 dir, void **objp, atomic_t **obj_refp)
4e81bb83
MN
1003{
1004 struct xfrm_policy *pol;
134b0fc5 1005 int err = 0;
4e81bb83
MN
1006
1007#ifdef CONFIG_XFRM_SUB_POLICY
52479b62 1008 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
134b0fc5
JM
1009 if (IS_ERR(pol)) {
1010 err = PTR_ERR(pol);
1011 pol = NULL;
1012 }
1013 if (pol || err)
4e81bb83
MN
1014 goto end;
1015#endif
52479b62 1016 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
134b0fc5
JM
1017 if (IS_ERR(pol)) {
1018 err = PTR_ERR(pol);
1019 pol = NULL;
1020 }
4e81bb83 1021#ifdef CONFIG_XFRM_SUB_POLICY
2518c7c2 1022end:
4e81bb83 1023#endif
1da177e4
LT
1024 if ((*objp = (void *) pol) != NULL)
1025 *obj_refp = &pol->refcnt;
134b0fc5 1026 return err;
1da177e4
LT
1027}
1028
df71837d
TJ
1029static inline int policy_to_flow_dir(int dir)
1030{
1031 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
a716c119
YH
1032 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1033 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1034 return dir;
1035 switch (dir) {
1036 default:
1037 case XFRM_POLICY_IN:
1038 return FLOW_DIR_IN;
1039 case XFRM_POLICY_OUT:
1040 return FLOW_DIR_OUT;
1041 case XFRM_POLICY_FWD:
1042 return FLOW_DIR_FWD;
3ff50b79 1043 }
df71837d
TJ
1044}
1045
e0d1caa7 1046static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
1da177e4
LT
1047{
1048 struct xfrm_policy *pol;
1049
1050 read_lock_bh(&xfrm_policy_lock);
1051 if ((pol = sk->sk_policy[dir]) != NULL) {
a716c119 1052 int match = xfrm_selector_match(&pol->selector, fl,
1da177e4 1053 sk->sk_family);
a716c119 1054 int err = 0;
df71837d 1055
3bccfbc7 1056 if (match) {
03e1ad7b
PM
1057 err = security_xfrm_policy_lookup(pol->security,
1058 fl->secid,
1059 policy_to_flow_dir(dir));
3bccfbc7
VY
1060 if (!err)
1061 xfrm_pol_hold(pol);
1062 else if (err == -ESRCH)
1063 pol = NULL;
1064 else
1065 pol = ERR_PTR(err);
1066 } else
1da177e4
LT
1067 pol = NULL;
1068 }
1069 read_unlock_bh(&xfrm_policy_lock);
1070 return pol;
1071}
1072
1073static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1074{
98806f75 1075 struct net *net = xp_net(pol);
1121994c 1076 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
2518c7c2 1077 pol->family, dir);
4e81bb83 1078
98806f75 1079 list_add(&pol->walk.all, &net->xfrm.policy_all);
2518c7c2 1080 hlist_add_head(&pol->bydst, chain);
e92303f8 1081 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
98806f75 1082 net->xfrm.policy_count[dir]++;
1da177e4 1083 xfrm_pol_hold(pol);
2518c7c2 1084
98806f75
AD
1085 if (xfrm_bydst_should_resize(net, dir, NULL))
1086 schedule_work(&net->xfrm.policy_hash_work);
1da177e4
LT
1087}
1088
1089static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1090 int dir)
1091{
98806f75
AD
1092 struct net *net = xp_net(pol);
1093
2518c7c2
DM
1094 if (hlist_unhashed(&pol->bydst))
1095 return NULL;
1da177e4 1096
2518c7c2
DM
1097 hlist_del(&pol->bydst);
1098 hlist_del(&pol->byidx);
12a169e7 1099 list_del(&pol->walk.all);
98806f75 1100 net->xfrm.policy_count[dir]--;
2518c7c2
DM
1101
1102 return pol;
1da177e4
LT
1103}
1104
4666faab 1105int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1da177e4
LT
1106{
1107 write_lock_bh(&xfrm_policy_lock);
1108 pol = __xfrm_policy_unlink(pol, dir);
1109 write_unlock_bh(&xfrm_policy_lock);
1110 if (pol) {
1111 if (dir < XFRM_POLICY_MAX)
1112 atomic_inc(&flow_cache_genid);
1113 xfrm_policy_kill(pol);
4666faab 1114 return 0;
1da177e4 1115 }
4666faab 1116 return -ENOENT;
1da177e4 1117}
a70fcb0b 1118EXPORT_SYMBOL(xfrm_policy_delete);
1da177e4
LT
1119
1120int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1121{
1121994c 1122 struct net *net = xp_net(pol);
1da177e4
LT
1123 struct xfrm_policy *old_pol;
1124
4e81bb83
MN
1125#ifdef CONFIG_XFRM_SUB_POLICY
1126 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1127 return -EINVAL;
1128#endif
1129
1da177e4
LT
1130 write_lock_bh(&xfrm_policy_lock);
1131 old_pol = sk->sk_policy[dir];
1132 sk->sk_policy[dir] = pol;
1133 if (pol) {
9d729f72 1134 pol->curlft.add_time = get_seconds();
1121994c 1135 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir);
1da177e4
LT
1136 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1137 }
1138 if (old_pol)
1139 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1140 write_unlock_bh(&xfrm_policy_lock);
1141
1142 if (old_pol) {
1143 xfrm_policy_kill(old_pol);
1144 }
1145 return 0;
1146}
1147
1148static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1149{
0331b1f3 1150 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1da177e4
LT
1151
1152 if (newp) {
1153 newp->selector = old->selector;
03e1ad7b
PM
1154 if (security_xfrm_policy_clone(old->security,
1155 &newp->security)) {
df71837d
TJ
1156 kfree(newp);
1157 return NULL; /* ENOMEM */
1158 }
1da177e4
LT
1159 newp->lft = old->lft;
1160 newp->curlft = old->curlft;
1161 newp->action = old->action;
1162 newp->flags = old->flags;
1163 newp->xfrm_nr = old->xfrm_nr;
1164 newp->index = old->index;
4e81bb83 1165 newp->type = old->type;
1da177e4
LT
1166 memcpy(newp->xfrm_vec, old->xfrm_vec,
1167 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1168 write_lock_bh(&xfrm_policy_lock);
1169 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1170 write_unlock_bh(&xfrm_policy_lock);
1171 xfrm_pol_put(newp);
1172 }
1173 return newp;
1174}
1175
1176int __xfrm_sk_clone_policy(struct sock *sk)
1177{
1178 struct xfrm_policy *p0 = sk->sk_policy[0],
1179 *p1 = sk->sk_policy[1];
1180
1181 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1182 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1183 return -ENOMEM;
1184 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1185 return -ENOMEM;
1186 return 0;
1187}
1188
a1e59abf
PM
1189static int
1190xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote,
1191 unsigned short family)
1192{
1193 int err;
1194 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1195
1196 if (unlikely(afinfo == NULL))
1197 return -EINVAL;
1198 err = afinfo->get_saddr(local, remote);
1199 xfrm_policy_put_afinfo(afinfo);
1200 return err;
1201}
1202
1da177e4
LT
1203/* Resolve list of templates for the flow, given policy. */
1204
1205static int
4e81bb83
MN
1206xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1207 struct xfrm_state **xfrm,
1208 unsigned short family)
1da177e4
LT
1209{
1210 int nx;
1211 int i, error;
1212 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1213 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
a1e59abf 1214 xfrm_address_t tmp;
1da177e4
LT
1215
1216 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1217 struct xfrm_state *x;
1218 xfrm_address_t *remote = daddr;
1219 xfrm_address_t *local = saddr;
1220 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1221
48b8d783
JK
1222 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1223 tmpl->mode == XFRM_MODE_BEET) {
1da177e4
LT
1224 remote = &tmpl->id.daddr;
1225 local = &tmpl->saddr;
76b3f055 1226 family = tmpl->encap_family;
a1e59abf
PM
1227 if (xfrm_addr_any(local, family)) {
1228 error = xfrm_get_saddr(&tmp, remote, family);
1229 if (error)
1230 goto fail;
1231 local = &tmp;
1232 }
1da177e4
LT
1233 }
1234
1235 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1236
1237 if (x && x->km.state == XFRM_STATE_VALID) {
1238 xfrm[nx++] = x;
1239 daddr = remote;
1240 saddr = local;
1241 continue;
1242 }
1243 if (x) {
1244 error = (x->km.state == XFRM_STATE_ERROR ?
1245 -EINVAL : -EAGAIN);
1246 xfrm_state_put(x);
1247 }
a4322266 1248 else if (error == -ESRCH)
1249 error = -EAGAIN;
1da177e4
LT
1250
1251 if (!tmpl->optional)
1252 goto fail;
1253 }
1254 return nx;
1255
1256fail:
1257 for (nx--; nx>=0; nx--)
1258 xfrm_state_put(xfrm[nx]);
1259 return error;
1260}
1261
4e81bb83
MN
1262static int
1263xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1264 struct xfrm_state **xfrm,
1265 unsigned short family)
1266{
41a49cc3
MN
1267 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1268 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
4e81bb83
MN
1269 int cnx = 0;
1270 int error;
1271 int ret;
1272 int i;
1273
1274 for (i = 0; i < npols; i++) {
1275 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1276 error = -ENOBUFS;
1277 goto fail;
1278 }
41a49cc3
MN
1279
1280 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
4e81bb83
MN
1281 if (ret < 0) {
1282 error = ret;
1283 goto fail;
1284 } else
1285 cnx += ret;
1286 }
1287
41a49cc3
MN
1288 /* found states are sorted for outbound processing */
1289 if (npols > 1)
1290 xfrm_state_sort(xfrm, tpp, cnx, family);
1291
4e81bb83
MN
1292 return cnx;
1293
1294 fail:
1295 for (cnx--; cnx>=0; cnx--)
41a49cc3 1296 xfrm_state_put(tpp[cnx]);
4e81bb83
MN
1297 return error;
1298
1299}
1300
1da177e4
LT
1301/* Check that the bundle accepts the flow and its components are
1302 * still valid.
1303 */
1304
1305static struct dst_entry *
1306xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
1307{
1308 struct dst_entry *x;
1309 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1310 if (unlikely(afinfo == NULL))
1311 return ERR_PTR(-EINVAL);
1312 x = afinfo->find_bundle(fl, policy);
1313 xfrm_policy_put_afinfo(afinfo);
1314 return x;
1315}
1316
25ee3286
HX
1317static inline int xfrm_get_tos(struct flowi *fl, int family)
1318{
1319 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1320 int tos;
1da177e4 1321
25ee3286
HX
1322 if (!afinfo)
1323 return -EINVAL;
1324
1325 tos = afinfo->get_tos(fl);
1326
1327 xfrm_policy_put_afinfo(afinfo);
1328
1329 return tos;
1330}
1331
1332static inline struct xfrm_dst *xfrm_alloc_dst(int family)
1da177e4 1333{
1da177e4 1334 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
25ee3286
HX
1335 struct xfrm_dst *xdst;
1336
1337 if (!afinfo)
1338 return ERR_PTR(-EINVAL);
1339
1340 xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS);
1341
1342 xfrm_policy_put_afinfo(afinfo);
1343
1344 return xdst;
1345}
1346
a1b05140
MN
1347static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1348 int nfheader_len)
1349{
1350 struct xfrm_policy_afinfo *afinfo =
1351 xfrm_policy_get_afinfo(dst->ops->family);
1352 int err;
1353
1354 if (!afinfo)
1355 return -EINVAL;
1356
1357 err = afinfo->init_path(path, dst, nfheader_len);
1358
1359 xfrm_policy_put_afinfo(afinfo);
1360
1361 return err;
1362}
1363
25ee3286
HX
1364static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
1365{
1366 struct xfrm_policy_afinfo *afinfo =
1367 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1368 int err;
1369
1370 if (!afinfo)
1da177e4 1371 return -EINVAL;
25ee3286
HX
1372
1373 err = afinfo->fill_dst(xdst, dev);
1374
1da177e4 1375 xfrm_policy_put_afinfo(afinfo);
25ee3286 1376
1da177e4
LT
1377 return err;
1378}
1379
25ee3286
HX
1380/* Allocate chain of dst_entry's, attach known xfrm's, calculate
1381 * all the metrics... Shortly, bundle a bundle.
1382 */
1383
1384static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1385 struct xfrm_state **xfrm, int nx,
1386 struct flowi *fl,
1387 struct dst_entry *dst)
1388{
1389 unsigned long now = jiffies;
1390 struct net_device *dev;
1391 struct dst_entry *dst_prev = NULL;
1392 struct dst_entry *dst0 = NULL;
1393 int i = 0;
1394 int err;
1395 int header_len = 0;
a1b05140 1396 int nfheader_len = 0;
25ee3286
HX
1397 int trailer_len = 0;
1398 int tos;
1399 int family = policy->selector.family;
9bb182a7
YH
1400 xfrm_address_t saddr, daddr;
1401
1402 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
25ee3286
HX
1403
1404 tos = xfrm_get_tos(fl, family);
1405 err = tos;
1406 if (tos < 0)
1407 goto put_states;
1408
1409 dst_hold(dst);
1410
1411 for (; i < nx; i++) {
1412 struct xfrm_dst *xdst = xfrm_alloc_dst(family);
1413 struct dst_entry *dst1 = &xdst->u.dst;
1414
1415 err = PTR_ERR(xdst);
1416 if (IS_ERR(xdst)) {
1417 dst_release(dst);
1418 goto put_states;
1419 }
1420
1421 if (!dst_prev)
1422 dst0 = dst1;
1423 else {
1424 dst_prev->child = dst_clone(dst1);
1425 dst1->flags |= DST_NOHASH;
1426 }
1427
1428 xdst->route = dst;
1429 memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics));
1430
1431 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1432 family = xfrm[i]->props.family;
9bb182a7
YH
1433 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1434 family);
25ee3286
HX
1435 err = PTR_ERR(dst);
1436 if (IS_ERR(dst))
1437 goto put_states;
1438 } else
1439 dst_hold(dst);
1440
1441 dst1->xfrm = xfrm[i];
1442 xdst->genid = xfrm[i]->genid;
1443
1444 dst1->obsolete = -1;
1445 dst1->flags |= DST_HOST;
1446 dst1->lastuse = now;
1447
1448 dst1->input = dst_discard;
1449 dst1->output = xfrm[i]->outer_mode->afinfo->output;
1450
1451 dst1->next = dst_prev;
1452 dst_prev = dst1;
1453
1454 header_len += xfrm[i]->props.header_len;
a1b05140
MN
1455 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1456 nfheader_len += xfrm[i]->props.header_len;
25ee3286
HX
1457 trailer_len += xfrm[i]->props.trailer_len;
1458 }
1459
1460 dst_prev->child = dst;
1461 dst0->path = dst;
1462
1463 err = -ENODEV;
1464 dev = dst->dev;
1465 if (!dev)
1466 goto free_dst;
1467
1468 /* Copy neighbout for reachability confirmation */
1469 dst0->neighbour = neigh_clone(dst->neighbour);
1470
a1b05140 1471 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
25ee3286
HX
1472 xfrm_init_pmtu(dst_prev);
1473
1474 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1475 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1476
1477 err = xfrm_fill_dst(xdst, dev);
1478 if (err)
1479 goto free_dst;
1480
1481 dst_prev->header_len = header_len;
1482 dst_prev->trailer_len = trailer_len;
1483 header_len -= xdst->u.dst.xfrm->props.header_len;
1484 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1485 }
1486
1487out:
1488 return dst0;
1489
1490put_states:
1491 for (; i < nx; i++)
1492 xfrm_state_put(xfrm[i]);
1493free_dst:
1494 if (dst0)
1495 dst_free(dst0);
1496 dst0 = ERR_PTR(err);
1497 goto out;
1498}
1499
157bfc25
MN
1500static int inline
1501xfrm_dst_alloc_copy(void **target, void *src, int size)
1502{
1503 if (!*target) {
1504 *target = kmalloc(size, GFP_ATOMIC);
1505 if (!*target)
1506 return -ENOMEM;
1507 }
1508 memcpy(*target, src, size);
1509 return 0;
1510}
1511
1512static int inline
1513xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
1514{
1515#ifdef CONFIG_XFRM_SUB_POLICY
1516 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1517 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1518 sel, sizeof(*sel));
1519#else
1520 return 0;
1521#endif
1522}
1523
1524static int inline
1525xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
1526{
1527#ifdef CONFIG_XFRM_SUB_POLICY
1528 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1529 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1530#else
1531 return 0;
1532#endif
1533}
1da177e4
LT
1534
1535static int stale_bundle(struct dst_entry *dst);
1536
1537/* Main function: finds/creates a bundle for given flow.
1538 *
1539 * At the moment we eat a raw IP route. Mostly to speed up lookups
1540 * on interfaces with disabled IPsec.
1541 */
52479b62 1542int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
14e50e57 1543 struct sock *sk, int flags)
1da177e4
LT
1544{
1545 struct xfrm_policy *policy;
4e81bb83
MN
1546 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1547 int npols;
1548 int pol_dead;
1549 int xfrm_nr;
1550 int pi;
1da177e4
LT
1551 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1552 struct dst_entry *dst, *dst_orig = *dst_p;
1553 int nx = 0;
1554 int err;
1555 u32 genid;
42cf93cd 1556 u16 family;
df71837d 1557 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
e0d1caa7 1558
1da177e4
LT
1559restart:
1560 genid = atomic_read(&flow_cache_genid);
1561 policy = NULL;
4e81bb83
MN
1562 for (pi = 0; pi < ARRAY_SIZE(pols); pi++)
1563 pols[pi] = NULL;
1564 npols = 0;
1565 pol_dead = 0;
1566 xfrm_nr = 0;
1567
f7944fb1 1568 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
e0d1caa7 1569 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
75b8c133 1570 err = PTR_ERR(policy);
0aa64774
MN
1571 if (IS_ERR(policy)) {
1572 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
75b8c133 1573 goto dropdst;
0aa64774 1574 }
3bccfbc7 1575 }
1da177e4
LT
1576
1577 if (!policy) {
1578 /* To accelerate a bit... */
2518c7c2 1579 if ((dst_orig->flags & DST_NOXFRM) ||
52479b62 1580 !net->xfrm.policy_count[XFRM_POLICY_OUT])
8b7817f3 1581 goto nopol;
1da177e4 1582
52479b62 1583 policy = flow_cache_lookup(net, fl, dst_orig->ops->family,
42cf93cd 1584 dir, xfrm_policy_lookup);
75b8c133 1585 err = PTR_ERR(policy);
d66e37a9
MN
1586 if (IS_ERR(policy)) {
1587 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
75b8c133 1588 goto dropdst;
d66e37a9 1589 }
1da177e4
LT
1590 }
1591
1592 if (!policy)
8b7817f3 1593 goto nopol;
1da177e4 1594
42cf93cd 1595 family = dst_orig->ops->family;
4e81bb83
MN
1596 pols[0] = policy;
1597 npols ++;
1598 xfrm_nr += pols[0]->xfrm_nr;
1da177e4 1599
aef21785 1600 err = -ENOENT;
8b7817f3
HX
1601 if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP))
1602 goto error;
1603
1604 policy->curlft.use_time = get_seconds();
1605
1da177e4 1606 switch (policy->action) {
5e5234ff 1607 default:
1da177e4
LT
1608 case XFRM_POLICY_BLOCK:
1609 /* Prohibit the flow */
0aa64774 1610 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK);
e104411b
PM
1611 err = -EPERM;
1612 goto error;
1da177e4
LT
1613
1614 case XFRM_POLICY_ALLOW:
4e81bb83 1615#ifndef CONFIG_XFRM_SUB_POLICY
1da177e4
LT
1616 if (policy->xfrm_nr == 0) {
1617 /* Flow passes not transformed. */
1618 xfrm_pol_put(policy);
1619 return 0;
1620 }
4e81bb83 1621#endif
1da177e4
LT
1622
1623 /* Try to find matching bundle.
1624 *
1625 * LATER: help from flow cache. It is optional, this
1626 * is required only for output policy.
1627 */
1628 dst = xfrm_find_bundle(fl, policy, family);
1629 if (IS_ERR(dst)) {
0aa64774 1630 XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
e104411b
PM
1631 err = PTR_ERR(dst);
1632 goto error;
1da177e4
LT
1633 }
1634
1635 if (dst)
1636 break;
1637
4e81bb83
MN
1638#ifdef CONFIG_XFRM_SUB_POLICY
1639 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
52479b62
AD
1640 pols[1] = xfrm_policy_lookup_bytype(net,
1641 XFRM_POLICY_TYPE_MAIN,
4e81bb83
MN
1642 fl, family,
1643 XFRM_POLICY_OUT);
1644 if (pols[1]) {
134b0fc5 1645 if (IS_ERR(pols[1])) {
0aa64774 1646 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
134b0fc5
JM
1647 err = PTR_ERR(pols[1]);
1648 goto error;
1649 }
4e81bb83 1650 if (pols[1]->action == XFRM_POLICY_BLOCK) {
0aa64774 1651 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK);
4e81bb83
MN
1652 err = -EPERM;
1653 goto error;
1654 }
1655 npols ++;
1656 xfrm_nr += pols[1]->xfrm_nr;
1657 }
1658 }
1659
1660 /*
1661 * Because neither flowi nor bundle information knows about
1662 * transformation template size. On more than one policy usage
1663 * we can realize whether all of them is bypass or not after
1664 * they are searched. See above not-transformed bypass
1665 * is surrounded by non-sub policy configuration, too.
1666 */
1667 if (xfrm_nr == 0) {
1668 /* Flow passes not transformed. */
1669 xfrm_pols_put(pols, npols);
1670 return 0;
1671 }
1672
1673#endif
1674 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1da177e4
LT
1675
1676 if (unlikely(nx<0)) {
1677 err = nx;
14e50e57
DM
1678 if (err == -EAGAIN && sysctl_xfrm_larval_drop) {
1679 /* EREMOTE tells the caller to generate
1680 * a one-shot blackhole route.
1681 */
d66e37a9 1682 XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
14e50e57
DM
1683 xfrm_pol_put(policy);
1684 return -EREMOTE;
1685 }
815f4e57 1686 if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) {
1da177e4
LT
1687 DECLARE_WAITQUEUE(wait, current);
1688
52479b62 1689 add_wait_queue(&net->xfrm.km_waitq, &wait);
1da177e4
LT
1690 set_current_state(TASK_INTERRUPTIBLE);
1691 schedule();
1692 set_current_state(TASK_RUNNING);
52479b62 1693 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1da177e4 1694
4e81bb83 1695 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1da177e4
LT
1696
1697 if (nx == -EAGAIN && signal_pending(current)) {
0aa64774 1698 XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
1da177e4
LT
1699 err = -ERESTART;
1700 goto error;
1701 }
1702 if (nx == -EAGAIN ||
1703 genid != atomic_read(&flow_cache_genid)) {
4e81bb83 1704 xfrm_pols_put(pols, npols);
1da177e4
LT
1705 goto restart;
1706 }
1707 err = nx;
1708 }
0aa64774
MN
1709 if (err < 0) {
1710 XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
1da177e4 1711 goto error;
0aa64774 1712 }
1da177e4
LT
1713 }
1714 if (nx == 0) {
1715 /* Flow passes not transformed. */
4e81bb83 1716 xfrm_pols_put(pols, npols);
1da177e4
LT
1717 return 0;
1718 }
1719
25ee3286
HX
1720 dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig);
1721 err = PTR_ERR(dst);
0aa64774
MN
1722 if (IS_ERR(dst)) {
1723 XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1da177e4 1724 goto error;
0aa64774 1725 }
1da177e4 1726
4e81bb83
MN
1727 for (pi = 0; pi < npols; pi++) {
1728 read_lock_bh(&pols[pi]->lock);
12a169e7 1729 pol_dead |= pols[pi]->walk.dead;
4e81bb83
MN
1730 read_unlock_bh(&pols[pi]->lock);
1731 }
1732
1da177e4 1733 write_lock_bh(&policy->lock);
4e81bb83 1734 if (unlikely(pol_dead || stale_bundle(dst))) {
1da177e4
LT
1735 /* Wow! While we worked on resolving, this
1736 * policy has gone. Retry. It is not paranoia,
1737 * we just cannot enlist new bundle to dead object.
1738 * We can't enlist stable bundles either.
1739 */
1740 write_unlock_bh(&policy->lock);
9d7d7402 1741 dst_free(dst);
00de651d 1742
0aa64774
MN
1743 if (pol_dead)
1744 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD);
1745 else
1746 XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
00de651d
HX
1747 err = -EHOSTUNREACH;
1748 goto error;
1da177e4 1749 }
157bfc25
MN
1750
1751 if (npols > 1)
1752 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1753 else
1754 err = xfrm_dst_update_origin(dst, fl);
1755 if (unlikely(err)) {
1756 write_unlock_bh(&policy->lock);
9d7d7402 1757 dst_free(dst);
0aa64774 1758 XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
157bfc25
MN
1759 goto error;
1760 }
1761
1da177e4
LT
1762 dst->next = policy->bundles;
1763 policy->bundles = dst;
1764 dst_hold(dst);
1765 write_unlock_bh(&policy->lock);
1766 }
1767 *dst_p = dst;
1768 dst_release(dst_orig);
a716c119 1769 xfrm_pols_put(pols, npols);
1da177e4
LT
1770 return 0;
1771
1772error:
4e81bb83 1773 xfrm_pols_put(pols, npols);
75b8c133
HX
1774dropdst:
1775 dst_release(dst_orig);
1da177e4
LT
1776 *dst_p = NULL;
1777 return err;
8b7817f3
HX
1778
1779nopol:
aef21785 1780 err = -ENOENT;
8b7817f3
HX
1781 if (flags & XFRM_LOOKUP_ICMP)
1782 goto dropdst;
1783 return 0;
1da177e4 1784}
14e50e57
DM
1785EXPORT_SYMBOL(__xfrm_lookup);
1786
52479b62 1787int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
14e50e57
DM
1788 struct sock *sk, int flags)
1789{
52479b62 1790 int err = __xfrm_lookup(net, dst_p, fl, sk, flags);
14e50e57
DM
1791
1792 if (err == -EREMOTE) {
1793 dst_release(*dst_p);
1794 *dst_p = NULL;
1795 err = -EAGAIN;
1796 }
1797
1798 return err;
1799}
1da177e4
LT
1800EXPORT_SYMBOL(xfrm_lookup);
1801
df0ba92a
MN
1802static inline int
1803xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1804{
1805 struct xfrm_state *x;
df0ba92a
MN
1806
1807 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1808 return 0;
1809 x = skb->sp->xvec[idx];
1810 if (!x->type->reject)
1811 return 0;
1ecafede 1812 return x->type->reject(x, skb, fl);
df0ba92a
MN
1813}
1814
1da177e4
LT
1815/* When skb is transformed back to its "native" form, we have to
1816 * check policy restrictions. At the moment we make this in maximally
1817 * stupid way. Shame on me. :-) Of course, connected sockets must
1818 * have policy cached at them.
1819 */
1820
1821static inline int
a716c119 1822xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1da177e4
LT
1823 unsigned short family)
1824{
1825 if (xfrm_state_kern(x))
928ba416 1826 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1da177e4
LT
1827 return x->id.proto == tmpl->id.proto &&
1828 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1829 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1830 x->props.mode == tmpl->mode &&
c5d18e98 1831 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
f3bd4840 1832 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
7e49e6de
MN
1833 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1834 xfrm_state_addr_cmp(tmpl, x, family));
1da177e4
LT
1835}
1836
df0ba92a
MN
1837/*
1838 * 0 or more than 0 is returned when validation is succeeded (either bypass
1839 * because of optional transport mode, or next index of the mathced secpath
1840 * state with the template.
1841 * -1 is returned when no matching template is found.
1842 * Otherwise "-2 - errored_index" is returned.
1843 */
1da177e4
LT
1844static inline int
1845xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1846 unsigned short family)
1847{
1848 int idx = start;
1849
1850 if (tmpl->optional) {
7e49e6de 1851 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1da177e4
LT
1852 return start;
1853 } else
1854 start = -1;
1855 for (; idx < sp->len; idx++) {
dbe5b4aa 1856 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1da177e4 1857 return ++idx;
df0ba92a
MN
1858 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1859 if (start == -1)
1860 start = -2-idx;
1da177e4 1861 break;
df0ba92a 1862 }
1da177e4
LT
1863 }
1864 return start;
1865}
1866
d5422efe
HX
1867int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1868 unsigned int family, int reverse)
1da177e4
LT
1869{
1870 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
e0d1caa7 1871 int err;
1da177e4
LT
1872
1873 if (unlikely(afinfo == NULL))
1874 return -EAFNOSUPPORT;
1875
d5422efe 1876 afinfo->decode_session(skb, fl, reverse);
beb8d13b 1877 err = security_xfrm_decode_session(skb, &fl->secid);
1da177e4 1878 xfrm_policy_put_afinfo(afinfo);
e0d1caa7 1879 return err;
1da177e4 1880}
d5422efe 1881EXPORT_SYMBOL(__xfrm_decode_session);
1da177e4 1882
df0ba92a 1883static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1da177e4
LT
1884{
1885 for (; k < sp->len; k++) {
df0ba92a 1886 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
d1d9facf 1887 *idxp = k;
1da177e4 1888 return 1;
df0ba92a 1889 }
1da177e4
LT
1890 }
1891
1892 return 0;
1893}
1894
a716c119 1895int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1da177e4
LT
1896 unsigned short family)
1897{
f6e1e25d 1898 struct net *net = dev_net(skb->dev);
1da177e4 1899 struct xfrm_policy *pol;
4e81bb83
MN
1900 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1901 int npols = 0;
1902 int xfrm_nr;
1903 int pi;
d5422efe 1904 int reverse;
1da177e4 1905 struct flowi fl;
d5422efe 1906 u8 fl_dir;
df0ba92a 1907 int xerr_idx = -1;
1da177e4 1908
d5422efe
HX
1909 reverse = dir & ~XFRM_POLICY_MASK;
1910 dir &= XFRM_POLICY_MASK;
1911 fl_dir = policy_to_flow_dir(dir);
1912
0aa64774
MN
1913 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
1914 XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR);
1da177e4 1915 return 0;
0aa64774
MN
1916 }
1917
eb9c7ebe 1918 nf_nat_decode_session(skb, &fl, family);
1da177e4
LT
1919
1920 /* First, check used SA against their selectors. */
1921 if (skb->sp) {
1922 int i;
1923
1924 for (i=skb->sp->len-1; i>=0; i--) {
dbe5b4aa 1925 struct xfrm_state *x = skb->sp->xvec[i];
0aa64774
MN
1926 if (!xfrm_selector_match(&x->sel, &fl, family)) {
1927 XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH);
1da177e4 1928 return 0;
0aa64774 1929 }
1da177e4
LT
1930 }
1931 }
1932
1933 pol = NULL;
3bccfbc7 1934 if (sk && sk->sk_policy[dir]) {
e0d1caa7 1935 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
0aa64774
MN
1936 if (IS_ERR(pol)) {
1937 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
3bccfbc7 1938 return 0;
0aa64774 1939 }
3bccfbc7 1940 }
1da177e4
LT
1941
1942 if (!pol)
f6e1e25d 1943 pol = flow_cache_lookup(net, &fl, family, fl_dir,
1da177e4
LT
1944 xfrm_policy_lookup);
1945
0aa64774
MN
1946 if (IS_ERR(pol)) {
1947 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
134b0fc5 1948 return 0;
0aa64774 1949 }
134b0fc5 1950
df0ba92a 1951 if (!pol) {
d1d9facf 1952 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
df0ba92a 1953 xfrm_secpath_reject(xerr_idx, skb, &fl);
0aa64774 1954 XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS);
df0ba92a
MN
1955 return 0;
1956 }
1957 return 1;
1958 }
1da177e4 1959
9d729f72 1960 pol->curlft.use_time = get_seconds();
1da177e4 1961
4e81bb83
MN
1962 pols[0] = pol;
1963 npols ++;
1964#ifdef CONFIG_XFRM_SUB_POLICY
1965 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
f6e1e25d 1966 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
4e81bb83
MN
1967 &fl, family,
1968 XFRM_POLICY_IN);
1969 if (pols[1]) {
0aa64774
MN
1970 if (IS_ERR(pols[1])) {
1971 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
134b0fc5 1972 return 0;
0aa64774 1973 }
9d729f72 1974 pols[1]->curlft.use_time = get_seconds();
4e81bb83
MN
1975 npols ++;
1976 }
1977 }
1978#endif
1979
1da177e4
LT
1980 if (pol->action == XFRM_POLICY_ALLOW) {
1981 struct sec_path *sp;
1982 static struct sec_path dummy;
4e81bb83 1983 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
41a49cc3 1984 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
4e81bb83
MN
1985 struct xfrm_tmpl **tpp = tp;
1986 int ti = 0;
1da177e4
LT
1987 int i, k;
1988
1989 if ((sp = skb->sp) == NULL)
1990 sp = &dummy;
1991
4e81bb83
MN
1992 for (pi = 0; pi < npols; pi++) {
1993 if (pols[pi] != pol &&
0aa64774
MN
1994 pols[pi]->action != XFRM_POLICY_ALLOW) {
1995 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK);
4e81bb83 1996 goto reject;
0aa64774
MN
1997 }
1998 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
1999 XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR);
4e81bb83 2000 goto reject_error;
0aa64774 2001 }
4e81bb83
MN
2002 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2003 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2004 }
2005 xfrm_nr = ti;
41a49cc3
MN
2006 if (npols > 1) {
2007 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2008 tpp = stp;
2009 }
4e81bb83 2010
1da177e4
LT
2011 /* For each tunnel xfrm, find the first matching tmpl.
2012 * For each tmpl before that, find corresponding xfrm.
2013 * Order is _important_. Later we will implement
2014 * some barriers, but at the moment barriers
2015 * are implied between each two transformations.
2016 */
4e81bb83
MN
2017 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2018 k = xfrm_policy_ok(tpp[i], sp, k, family);
df0ba92a 2019 if (k < 0) {
d1d9facf
JM
2020 if (k < -1)
2021 /* "-2 - errored_index" returned */
2022 xerr_idx = -(2+k);
0aa64774 2023 XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2024 goto reject;
df0ba92a 2025 }
1da177e4
LT
2026 }
2027
0aa64774
MN
2028 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2029 XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2030 goto reject;
0aa64774 2031 }
1da177e4 2032
4e81bb83 2033 xfrm_pols_put(pols, npols);
1da177e4
LT
2034 return 1;
2035 }
0aa64774 2036 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK);
1da177e4
LT
2037
2038reject:
df0ba92a 2039 xfrm_secpath_reject(xerr_idx, skb, &fl);
4e81bb83
MN
2040reject_error:
2041 xfrm_pols_put(pols, npols);
1da177e4
LT
2042 return 0;
2043}
2044EXPORT_SYMBOL(__xfrm_policy_check);
2045
2046int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2047{
99a66657 2048 struct net *net = dev_net(skb->dev);
1da177e4
LT
2049 struct flowi fl;
2050
0aa64774
MN
2051 if (xfrm_decode_session(skb, &fl, family) < 0) {
2052 /* XXX: we should have something like FWDHDRERROR here. */
2053 XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR);
1da177e4 2054 return 0;
0aa64774 2055 }
1da177e4 2056
99a66657 2057 return xfrm_lookup(net, &skb->dst, &fl, NULL, 0) == 0;
1da177e4
LT
2058}
2059EXPORT_SYMBOL(__xfrm_route_forward);
2060
d49c73c7
DM
2061/* Optimize later using cookies and generation ids. */
2062
1da177e4
LT
2063static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2064{
d49c73c7
DM
2065 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2066 * to "-1" to force all XFRM destinations to get validated by
2067 * dst_ops->check on every use. We do this because when a
2068 * normal route referenced by an XFRM dst is obsoleted we do
2069 * not go looking around for all parent referencing XFRM dsts
2070 * so that we can invalidate them. It is just too much work.
2071 * Instead we make the checks here on every use. For example:
2072 *
2073 * XFRM dst A --> IPv4 dst X
2074 *
2075 * X is the "xdst->route" of A (X is also the "dst->path" of A
2076 * in this example). If X is marked obsolete, "A" will not
2077 * notice. That's what we are validating here via the
2078 * stale_bundle() check.
2079 *
2080 * When a policy's bundle is pruned, we dst_free() the XFRM
2081 * dst which causes it's ->obsolete field to be set to a
2082 * positive non-zero integer. If an XFRM dst has been pruned
2083 * like this, we want to force a new route lookup.
399c180a 2084 */
d49c73c7
DM
2085 if (dst->obsolete < 0 && !stale_bundle(dst))
2086 return dst;
2087
1da177e4
LT
2088 return NULL;
2089}
2090
2091static int stale_bundle(struct dst_entry *dst)
2092{
5b368e61 2093 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
1da177e4
LT
2094}
2095
aabc9761 2096void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1da177e4 2097{
1da177e4 2098 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
c346dca1 2099 dst->dev = dev_net(dev)->loopback_dev;
de3cb747 2100 dev_hold(dst->dev);
1da177e4
LT
2101 dev_put(dev);
2102 }
2103}
aabc9761 2104EXPORT_SYMBOL(xfrm_dst_ifdown);
1da177e4
LT
2105
2106static void xfrm_link_failure(struct sk_buff *skb)
2107{
2108 /* Impossible. Such dst must be popped before reaches point of failure. */
2109 return;
2110}
2111
2112static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2113{
2114 if (dst) {
2115 if (dst->obsolete) {
2116 dst_release(dst);
2117 dst = NULL;
2118 }
2119 }
2120 return dst;
2121}
2122
2518c7c2
DM
2123static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p)
2124{
2125 struct dst_entry *dst, **dstp;
2126
2127 write_lock(&pol->lock);
2128 dstp = &pol->bundles;
2129 while ((dst=*dstp) != NULL) {
2130 if (func(dst)) {
2131 *dstp = dst->next;
2132 dst->next = *gc_list_p;
2133 *gc_list_p = dst;
2134 } else {
2135 dstp = &dst->next;
2136 }
2137 }
2138 write_unlock(&pol->lock);
2139}
2140
3dd0b499 2141static void xfrm_prune_bundles(struct net *net, int (*func)(struct dst_entry *))
1da177e4 2142{
2518c7c2
DM
2143 struct dst_entry *gc_list = NULL;
2144 int dir;
1da177e4
LT
2145
2146 read_lock_bh(&xfrm_policy_lock);
2518c7c2
DM
2147 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2148 struct xfrm_policy *pol;
2149 struct hlist_node *entry;
2150 struct hlist_head *table;
2151 int i;
4e81bb83 2152
2518c7c2 2153 hlist_for_each_entry(pol, entry,
3dd0b499 2154 &net->xfrm.policy_inexact[dir], bydst)
2518c7c2
DM
2155 prune_one_bundle(pol, func, &gc_list);
2156
3dd0b499
AD
2157 table = net->xfrm.policy_bydst[dir].table;
2158 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
2518c7c2
DM
2159 hlist_for_each_entry(pol, entry, table + i, bydst)
2160 prune_one_bundle(pol, func, &gc_list);
1da177e4
LT
2161 }
2162 }
2163 read_unlock_bh(&xfrm_policy_lock);
2164
2165 while (gc_list) {
2518c7c2 2166 struct dst_entry *dst = gc_list;
1da177e4
LT
2167 gc_list = dst->next;
2168 dst_free(dst);
2169 }
2170}
2171
2172static int unused_bundle(struct dst_entry *dst)
2173{
2174 return !atomic_read(&dst->__refcnt);
2175}
2176
ddcfd796 2177static void __xfrm_garbage_collect(struct net *net)
1da177e4 2178{
ddcfd796 2179 xfrm_prune_bundles(net, unused_bundle);
1da177e4
LT
2180}
2181
3dd0b499 2182static int xfrm_flush_bundles(struct net *net)
1da177e4 2183{
3dd0b499 2184 xfrm_prune_bundles(net, stale_bundle);
1da177e4
LT
2185 return 0;
2186}
2187
25ee3286 2188static void xfrm_init_pmtu(struct dst_entry *dst)
1da177e4
LT
2189{
2190 do {
2191 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2192 u32 pmtu, route_mtu_cached;
2193
2194 pmtu = dst_mtu(dst->child);
2195 xdst->child_mtu_cached = pmtu;
2196
2197 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2198
2199 route_mtu_cached = dst_mtu(xdst->route);
2200 xdst->route_mtu_cached = route_mtu_cached;
2201
2202 if (pmtu > route_mtu_cached)
2203 pmtu = route_mtu_cached;
2204
2205 dst->metrics[RTAX_MTU-1] = pmtu;
2206 } while ((dst = dst->next));
2207}
2208
1da177e4
LT
2209/* Check that the bundle accepts the flow and its components are
2210 * still valid.
2211 */
2212
5b368e61
VY
2213int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
2214 struct flowi *fl, int family, int strict)
1da177e4
LT
2215{
2216 struct dst_entry *dst = &first->u.dst;
2217 struct xfrm_dst *last;
2218 u32 mtu;
2219
92d63dec 2220 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1da177e4
LT
2221 (dst->dev && !netif_running(dst->dev)))
2222 return 0;
157bfc25
MN
2223#ifdef CONFIG_XFRM_SUB_POLICY
2224 if (fl) {
2225 if (first->origin && !flow_cache_uli_match(first->origin, fl))
2226 return 0;
2227 if (first->partner &&
2228 !xfrm_selector_match(first->partner, fl, family))
2229 return 0;
2230 }
2231#endif
1da177e4
LT
2232
2233 last = NULL;
2234
2235 do {
2236 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2237
2238 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
2239 return 0;
67f83cbf
VY
2240 if (fl && pol &&
2241 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
e0d1caa7 2242 return 0;
1da177e4
LT
2243 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2244 return 0;
9d4a706d
DM
2245 if (xdst->genid != dst->xfrm->genid)
2246 return 0;
e53820de 2247
1bfcb10f 2248 if (strict && fl &&
13996378 2249 !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
e53820de
MN
2250 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
2251 return 0;
1da177e4
LT
2252
2253 mtu = dst_mtu(dst->child);
2254 if (xdst->child_mtu_cached != mtu) {
2255 last = xdst;
2256 xdst->child_mtu_cached = mtu;
2257 }
2258
92d63dec 2259 if (!dst_check(xdst->route, xdst->route_cookie))
1da177e4
LT
2260 return 0;
2261 mtu = dst_mtu(xdst->route);
2262 if (xdst->route_mtu_cached != mtu) {
2263 last = xdst;
2264 xdst->route_mtu_cached = mtu;
2265 }
2266
2267 dst = dst->child;
2268 } while (dst->xfrm);
2269
2270 if (likely(!last))
2271 return 1;
2272
2273 mtu = last->child_mtu_cached;
2274 for (;;) {
2275 dst = &last->u.dst;
2276
2277 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2278 if (mtu > last->route_mtu_cached)
2279 mtu = last->route_mtu_cached;
2280 dst->metrics[RTAX_MTU-1] = mtu;
2281
2282 if (last == first)
2283 break;
2284
bd0bf076 2285 last = (struct xfrm_dst *)last->u.dst.next;
1da177e4
LT
2286 last->child_mtu_cached = mtu;
2287 }
2288
2289 return 1;
2290}
2291
2292EXPORT_SYMBOL(xfrm_bundle_ok);
2293
1da177e4
LT
2294int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2295{
2296 int err = 0;
2297 if (unlikely(afinfo == NULL))
2298 return -EINVAL;
2299 if (unlikely(afinfo->family >= NPROTO))
2300 return -EAFNOSUPPORT;
e959d812 2301 write_lock_bh(&xfrm_policy_afinfo_lock);
1da177e4
LT
2302 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2303 err = -ENOBUFS;
2304 else {
2305 struct dst_ops *dst_ops = afinfo->dst_ops;
2306 if (likely(dst_ops->kmem_cachep == NULL))
2307 dst_ops->kmem_cachep = xfrm_dst_cache;
2308 if (likely(dst_ops->check == NULL))
2309 dst_ops->check = xfrm_dst_check;
1da177e4
LT
2310 if (likely(dst_ops->negative_advice == NULL))
2311 dst_ops->negative_advice = xfrm_negative_advice;
2312 if (likely(dst_ops->link_failure == NULL))
2313 dst_ops->link_failure = xfrm_link_failure;
1da177e4
LT
2314 if (likely(afinfo->garbage_collect == NULL))
2315 afinfo->garbage_collect = __xfrm_garbage_collect;
2316 xfrm_policy_afinfo[afinfo->family] = afinfo;
2317 }
e959d812 2318 write_unlock_bh(&xfrm_policy_afinfo_lock);
1da177e4
LT
2319 return err;
2320}
2321EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2322
2323int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2324{
2325 int err = 0;
2326 if (unlikely(afinfo == NULL))
2327 return -EINVAL;
2328 if (unlikely(afinfo->family >= NPROTO))
2329 return -EAFNOSUPPORT;
e959d812 2330 write_lock_bh(&xfrm_policy_afinfo_lock);
1da177e4
LT
2331 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2332 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2333 err = -EINVAL;
2334 else {
2335 struct dst_ops *dst_ops = afinfo->dst_ops;
2336 xfrm_policy_afinfo[afinfo->family] = NULL;
2337 dst_ops->kmem_cachep = NULL;
2338 dst_ops->check = NULL;
1da177e4
LT
2339 dst_ops->negative_advice = NULL;
2340 dst_ops->link_failure = NULL;
1da177e4
LT
2341 afinfo->garbage_collect = NULL;
2342 }
2343 }
e959d812 2344 write_unlock_bh(&xfrm_policy_afinfo_lock);
1da177e4
LT
2345 return err;
2346}
2347EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2348
2349static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2350{
2351 struct xfrm_policy_afinfo *afinfo;
2352 if (unlikely(family >= NPROTO))
2353 return NULL;
2354 read_lock(&xfrm_policy_afinfo_lock);
2355 afinfo = xfrm_policy_afinfo[family];
546be240
HX
2356 if (unlikely(!afinfo))
2357 read_unlock(&xfrm_policy_afinfo_lock);
1da177e4
LT
2358 return afinfo;
2359}
2360
2361static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2362{
546be240
HX
2363 read_unlock(&xfrm_policy_afinfo_lock);
2364}
2365
1da177e4
LT
2366static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2367{
e9dc8653
EB
2368 struct net_device *dev = ptr;
2369
1da177e4
LT
2370 switch (event) {
2371 case NETDEV_DOWN:
3dd0b499 2372 xfrm_flush_bundles(dev_net(dev));
1da177e4
LT
2373 }
2374 return NOTIFY_DONE;
2375}
2376
2377static struct notifier_block xfrm_dev_notifier = {
d5917a35 2378 .notifier_call = xfrm_dev_event,
1da177e4
LT
2379};
2380
558f82ef
MN
2381#ifdef CONFIG_XFRM_STATISTICS
2382static int __init xfrm_statistics_init(void)
2383{
2384 if (snmp_mib_init((void **)xfrm_statistics,
2385 sizeof(struct linux_xfrm_mib)) < 0)
2386 return -ENOMEM;
2387 return 0;
2388}
2389#endif
2390
d62ddc21 2391static int __net_init xfrm_policy_init(struct net *net)
1da177e4 2392{
2518c7c2
DM
2393 unsigned int hmask, sz;
2394 int dir;
2395
d62ddc21
AD
2396 if (net_eq(net, &init_net))
2397 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1da177e4 2398 sizeof(struct xfrm_dst),
e5d679f3 2399 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
20c2df83 2400 NULL);
1da177e4 2401
2518c7c2
DM
2402 hmask = 8 - 1;
2403 sz = (hmask+1) * sizeof(struct hlist_head);
2404
93b851c1
AD
2405 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2406 if (!net->xfrm.policy_byidx)
2407 goto out_byidx;
8100bea7 2408 net->xfrm.policy_idx_hmask = hmask;
2518c7c2
DM
2409
2410 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2411 struct xfrm_policy_hash *htab;
2412
dc2caba7 2413 net->xfrm.policy_count[dir] = 0;
8b18f8ea 2414 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2518c7c2 2415
a35f6c5d 2416 htab = &net->xfrm.policy_bydst[dir];
44e36b42 2417 htab->table = xfrm_hash_alloc(sz);
2518c7c2 2418 if (!htab->table)
a35f6c5d
AD
2419 goto out_bydst;
2420 htab->hmask = hmask;
2518c7c2
DM
2421 }
2422
adfcf0b2 2423 INIT_LIST_HEAD(&net->xfrm.policy_all);
66caf628 2424 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
d62ddc21
AD
2425 if (net_eq(net, &init_net))
2426 register_netdevice_notifier(&xfrm_dev_notifier);
2427 return 0;
93b851c1 2428
a35f6c5d
AD
2429out_bydst:
2430 for (dir--; dir >= 0; dir--) {
2431 struct xfrm_policy_hash *htab;
2432
2433 htab = &net->xfrm.policy_bydst[dir];
2434 xfrm_hash_free(htab->table, sz);
2435 }
2436 xfrm_hash_free(net->xfrm.policy_byidx, sz);
93b851c1
AD
2437out_byidx:
2438 return -ENOMEM;
d62ddc21
AD
2439}
2440
2441static void xfrm_policy_fini(struct net *net)
2442{
93b851c1 2443 unsigned int sz;
8b18f8ea 2444 int dir;
93b851c1 2445
adfcf0b2 2446 WARN_ON(!list_empty(&net->xfrm.policy_all));
93b851c1 2447
8b18f8ea 2448 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
a35f6c5d
AD
2449 struct xfrm_policy_hash *htab;
2450
8b18f8ea 2451 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
a35f6c5d
AD
2452
2453 htab = &net->xfrm.policy_bydst[dir];
2454 sz = (htab->hmask + 1);
2455 WARN_ON(!hlist_empty(htab->table));
2456 xfrm_hash_free(htab->table, sz);
8b18f8ea
AD
2457 }
2458
8100bea7 2459 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
93b851c1
AD
2460 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2461 xfrm_hash_free(net->xfrm.policy_byidx, sz);
1da177e4
LT
2462}
2463
d62ddc21
AD
2464static int __net_init xfrm_net_init(struct net *net)
2465{
2466 int rv;
2467
2468 rv = xfrm_state_init(net);
2469 if (rv < 0)
2470 goto out_state;
2471 rv = xfrm_policy_init(net);
2472 if (rv < 0)
2473 goto out_policy;
2474 return 0;
2475
2476out_policy:
2477 xfrm_state_fini(net);
2478out_state:
2479 return rv;
2480}
2481
2482static void __net_exit xfrm_net_exit(struct net *net)
2483{
2484 xfrm_policy_fini(net);
2485 xfrm_state_fini(net);
2486}
2487
2488static struct pernet_operations __net_initdata xfrm_net_ops = {
2489 .init = xfrm_net_init,
2490 .exit = xfrm_net_exit,
2491};
2492
1da177e4
LT
2493void __init xfrm_init(void)
2494{
d62ddc21 2495 register_pernet_subsys(&xfrm_net_ops);
558f82ef
MN
2496#ifdef CONFIG_XFRM_STATISTICS
2497 xfrm_statistics_init();
2498#endif
1da177e4 2499 xfrm_input_init();
558f82ef
MN
2500#ifdef CONFIG_XFRM_STATISTICS
2501 xfrm_proc_init();
2502#endif
1da177e4
LT
2503}
2504
ab5f5e8b 2505#ifdef CONFIG_AUDITSYSCALL
1486cbd7
IJ
2506static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2507 struct audit_buffer *audit_buf)
ab5f5e8b 2508{
875179fa
PM
2509 struct xfrm_sec_ctx *ctx = xp->security;
2510 struct xfrm_selector *sel = &xp->selector;
2511
2512 if (ctx)
ab5f5e8b 2513 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
875179fa 2514 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
ab5f5e8b 2515
875179fa 2516 switch(sel->family) {
ab5f5e8b 2517 case AF_INET:
21454aaa 2518 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
875179fa
PM
2519 if (sel->prefixlen_s != 32)
2520 audit_log_format(audit_buf, " src_prefixlen=%d",
2521 sel->prefixlen_s);
21454aaa 2522 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
875179fa
PM
2523 if (sel->prefixlen_d != 32)
2524 audit_log_format(audit_buf, " dst_prefixlen=%d",
2525 sel->prefixlen_d);
ab5f5e8b
JL
2526 break;
2527 case AF_INET6:
5b095d98 2528 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
875179fa
PM
2529 if (sel->prefixlen_s != 128)
2530 audit_log_format(audit_buf, " src_prefixlen=%d",
2531 sel->prefixlen_s);
5b095d98 2532 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
875179fa
PM
2533 if (sel->prefixlen_d != 128)
2534 audit_log_format(audit_buf, " dst_prefixlen=%d",
2535 sel->prefixlen_d);
ab5f5e8b
JL
2536 break;
2537 }
2538}
2539
68277acc 2540void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
2532386f 2541 uid_t auid, u32 sessionid, u32 secid)
ab5f5e8b
JL
2542{
2543 struct audit_buffer *audit_buf;
ab5f5e8b 2544
afeb14b4 2545 audit_buf = xfrm_audit_start("SPD-add");
ab5f5e8b
JL
2546 if (audit_buf == NULL)
2547 return;
2532386f 2548 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
afeb14b4 2549 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL
2550 xfrm_audit_common_policyinfo(xp, audit_buf);
2551 audit_log_end(audit_buf);
2552}
2553EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2554
68277acc 2555void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2532386f 2556 uid_t auid, u32 sessionid, u32 secid)
ab5f5e8b
JL
2557{
2558 struct audit_buffer *audit_buf;
ab5f5e8b 2559
afeb14b4 2560 audit_buf = xfrm_audit_start("SPD-delete");
ab5f5e8b
JL
2561 if (audit_buf == NULL)
2562 return;
2532386f 2563 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
afeb14b4 2564 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL
2565 xfrm_audit_common_policyinfo(xp, audit_buf);
2566 audit_log_end(audit_buf);
2567}
2568EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2569#endif
2570
80c9abaa
SS
2571#ifdef CONFIG_XFRM_MIGRATE
2572static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2573 struct xfrm_selector *sel_tgt)
2574{
2575 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2576 if (sel_tgt->family == sel_cmp->family &&
2577 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
a716c119 2578 sel_cmp->family) == 0 &&
80c9abaa
SS
2579 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2580 sel_cmp->family) == 0 &&
2581 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2582 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2583 return 1;
2584 }
2585 } else {
2586 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2587 return 1;
2588 }
2589 }
2590 return 0;
2591}
2592
2593static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2594 u8 dir, u8 type)
2595{
2596 struct xfrm_policy *pol, *ret = NULL;
2597 struct hlist_node *entry;
2598 struct hlist_head *chain;
2599 u32 priority = ~0U;
2600
2601 read_lock_bh(&xfrm_policy_lock);
1121994c 2602 chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
80c9abaa
SS
2603 hlist_for_each_entry(pol, entry, chain, bydst) {
2604 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2605 pol->type == type) {
2606 ret = pol;
2607 priority = ret->priority;
2608 break;
2609 }
2610 }
8b18f8ea 2611 chain = &init_net.xfrm.policy_inexact[dir];
80c9abaa
SS
2612 hlist_for_each_entry(pol, entry, chain, bydst) {
2613 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2614 pol->type == type &&
2615 pol->priority < priority) {
2616 ret = pol;
2617 break;
2618 }
2619 }
2620
2621 if (ret)
2622 xfrm_pol_hold(ret);
2623
2624 read_unlock_bh(&xfrm_policy_lock);
2625
2626 return ret;
2627}
2628
2629static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2630{
2631 int match = 0;
2632
2633 if (t->mode == m->mode && t->id.proto == m->proto &&
2634 (m->reqid == 0 || t->reqid == m->reqid)) {
2635 switch (t->mode) {
2636 case XFRM_MODE_TUNNEL:
2637 case XFRM_MODE_BEET:
2638 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2639 m->old_family) == 0 &&
2640 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2641 m->old_family) == 0) {
2642 match = 1;
2643 }
2644 break;
2645 case XFRM_MODE_TRANSPORT:
2646 /* in case of transport mode, template does not store
2647 any IP addresses, hence we just compare mode and
2648 protocol */
2649 match = 1;
2650 break;
2651 default:
2652 break;
2653 }
2654 }
2655 return match;
2656}
2657
2658/* update endpoint address(es) of template(s) */
2659static int xfrm_policy_migrate(struct xfrm_policy *pol,
2660 struct xfrm_migrate *m, int num_migrate)
2661{
2662 struct xfrm_migrate *mp;
2663 struct dst_entry *dst;
2664 int i, j, n = 0;
2665
2666 write_lock_bh(&pol->lock);
12a169e7 2667 if (unlikely(pol->walk.dead)) {
80c9abaa
SS
2668 /* target policy has been deleted */
2669 write_unlock_bh(&pol->lock);
2670 return -ENOENT;
2671 }
2672
2673 for (i = 0; i < pol->xfrm_nr; i++) {
2674 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2675 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2676 continue;
2677 n++;
1bfcb10f
HX
2678 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2679 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
80c9abaa
SS
2680 continue;
2681 /* update endpoints */
2682 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2683 sizeof(pol->xfrm_vec[i].id.daddr));
2684 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2685 sizeof(pol->xfrm_vec[i].saddr));
2686 pol->xfrm_vec[i].encap_family = mp->new_family;
2687 /* flush bundles */
2688 while ((dst = pol->bundles) != NULL) {
2689 pol->bundles = dst->next;
2690 dst_free(dst);
2691 }
2692 }
2693 }
2694
2695 write_unlock_bh(&pol->lock);
2696
2697 if (!n)
2698 return -ENODATA;
2699
2700 return 0;
2701}
2702
2703static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2704{
2705 int i, j;
2706
2707 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2708 return -EINVAL;
2709
2710 for (i = 0; i < num_migrate; i++) {
2711 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2712 m[i].old_family) == 0) &&
2713 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2714 m[i].old_family) == 0))
2715 return -EINVAL;
2716 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2717 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2718 return -EINVAL;
2719
2720 /* check if there is any duplicated entry */
2721 for (j = i + 1; j < num_migrate; j++) {
2722 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2723 sizeof(m[i].old_daddr)) &&
2724 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2725 sizeof(m[i].old_saddr)) &&
2726 m[i].proto == m[j].proto &&
2727 m[i].mode == m[j].mode &&
2728 m[i].reqid == m[j].reqid &&
2729 m[i].old_family == m[j].old_family)
2730 return -EINVAL;
2731 }
2732 }
2733
2734 return 0;
2735}
2736
2737int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
13c1d189
AE
2738 struct xfrm_migrate *m, int num_migrate,
2739 struct xfrm_kmaddress *k)
80c9abaa
SS
2740{
2741 int i, err, nx_cur = 0, nx_new = 0;
2742 struct xfrm_policy *pol = NULL;
2743 struct xfrm_state *x, *xc;
2744 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2745 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2746 struct xfrm_migrate *mp;
2747
2748 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2749 goto out;
2750
2751 /* Stage 1 - find policy */
2752 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2753 err = -ENOENT;
2754 goto out;
2755 }
2756
2757 /* Stage 2 - find and update state(s) */
2758 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2759 if ((x = xfrm_migrate_state_find(mp))) {
2760 x_cur[nx_cur] = x;
2761 nx_cur++;
2762 if ((xc = xfrm_state_migrate(x, mp))) {
2763 x_new[nx_new] = xc;
2764 nx_new++;
2765 } else {
2766 err = -ENODATA;
2767 goto restore_state;
2768 }
2769 }
2770 }
2771
2772 /* Stage 3 - update policy */
2773 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2774 goto restore_state;
2775
2776 /* Stage 4 - delete old state(s) */
2777 if (nx_cur) {
2778 xfrm_states_put(x_cur, nx_cur);
2779 xfrm_states_delete(x_cur, nx_cur);
2780 }
2781
2782 /* Stage 5 - announce */
13c1d189 2783 km_migrate(sel, dir, type, m, num_migrate, k);
80c9abaa
SS
2784
2785 xfrm_pol_put(pol);
2786
2787 return 0;
2788out:
2789 return err;
2790
2791restore_state:
2792 if (pol)
2793 xfrm_pol_put(pol);
2794 if (nx_cur)
2795 xfrm_states_put(x_cur, nx_cur);
2796 if (nx_new)
2797 xfrm_states_delete(x_new, nx_new);
2798
2799 return err;
2800}
e610e679 2801EXPORT_SYMBOL(xfrm_migrate);
80c9abaa 2802#endif