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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
2518c7c2
DM
49unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
50EXPORT_SYMBOL(xfrm_policy_count);
1da177e4
LT
51
52static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
53static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
54
e18b890b 55static struct kmem_cache *xfrm_dst_cache __read_mostly;
1da177e4 56
2518c7c2 57static HLIST_HEAD(xfrm_policy_gc_list);
1da177e4
LT
58static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
59
60static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
61static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
25ee3286 62static void xfrm_init_pmtu(struct dst_entry *dst);
1da177e4 63
77681021
AM
64static inline int
65__xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
66{
67 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
68 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
69 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
70 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
71 (fl->proto == sel->proto || !sel->proto) &&
72 (fl->oif == sel->ifindex || !sel->ifindex);
73}
74
75static inline int
76__xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
77{
78 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
79 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
80 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
81 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
82 (fl->proto == sel->proto || !sel->proto) &&
83 (fl->oif == sel->ifindex || !sel->ifindex);
84}
85
86int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
87 unsigned short family)
88{
89 switch (family) {
90 case AF_INET:
91 return __xfrm4_selector_match(sel, fl);
92 case AF_INET6:
93 return __xfrm6_selector_match(sel, fl);
94 }
95 return 0;
96}
97
9bb182a7
YH
98static inline struct dst_entry *__xfrm_dst_lookup(int tos,
99 xfrm_address_t *saddr,
100 xfrm_address_t *daddr,
101 int family)
102{
103 struct xfrm_policy_afinfo *afinfo;
104 struct dst_entry *dst;
105
106 afinfo = xfrm_policy_get_afinfo(family);
107 if (unlikely(afinfo == NULL))
108 return ERR_PTR(-EAFNOSUPPORT);
109
110 dst = afinfo->dst_lookup(tos, saddr, daddr);
111
112 xfrm_policy_put_afinfo(afinfo);
113
114 return dst;
115}
116
25ee3286 117static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
9bb182a7
YH
118 xfrm_address_t *prev_saddr,
119 xfrm_address_t *prev_daddr,
25ee3286 120 int family)
1da177e4 121{
66cdb3ca
HX
122 xfrm_address_t *saddr = &x->props.saddr;
123 xfrm_address_t *daddr = &x->id.daddr;
66cdb3ca
HX
124 struct dst_entry *dst;
125
9bb182a7 126 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
66cdb3ca 127 saddr = x->coaddr;
9bb182a7
YH
128 daddr = prev_daddr;
129 }
130 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
131 saddr = prev_saddr;
66cdb3ca 132 daddr = x->coaddr;
9bb182a7 133 }
1da177e4 134
9bb182a7
YH
135 dst = __xfrm_dst_lookup(tos, saddr, daddr, family);
136
137 if (!IS_ERR(dst)) {
138 if (prev_saddr != saddr)
139 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
140 if (prev_daddr != daddr)
141 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
142 }
1da177e4 143
66cdb3ca 144 return dst;
1da177e4 145}
1da177e4 146
1da177e4
LT
147static inline unsigned long make_jiffies(long secs)
148{
149 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
150 return MAX_SCHEDULE_TIMEOUT-1;
151 else
a716c119 152 return secs*HZ;
1da177e4
LT
153}
154
155static void xfrm_policy_timer(unsigned long data)
156{
157 struct xfrm_policy *xp = (struct xfrm_policy*)data;
9d729f72 158 unsigned long now = get_seconds();
1da177e4
LT
159 long next = LONG_MAX;
160 int warn = 0;
161 int dir;
162
163 read_lock(&xp->lock);
164
12a169e7 165 if (xp->walk.dead)
1da177e4
LT
166 goto out;
167
77d8d7a6 168 dir = xfrm_policy_id2dir(xp->index);
1da177e4
LT
169
170 if (xp->lft.hard_add_expires_seconds) {
171 long tmo = xp->lft.hard_add_expires_seconds +
172 xp->curlft.add_time - now;
173 if (tmo <= 0)
174 goto expired;
175 if (tmo < next)
176 next = tmo;
177 }
178 if (xp->lft.hard_use_expires_seconds) {
179 long tmo = xp->lft.hard_use_expires_seconds +
180 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
181 if (tmo <= 0)
182 goto expired;
183 if (tmo < next)
184 next = tmo;
185 }
186 if (xp->lft.soft_add_expires_seconds) {
187 long tmo = xp->lft.soft_add_expires_seconds +
188 xp->curlft.add_time - now;
189 if (tmo <= 0) {
190 warn = 1;
191 tmo = XFRM_KM_TIMEOUT;
192 }
193 if (tmo < next)
194 next = tmo;
195 }
196 if (xp->lft.soft_use_expires_seconds) {
197 long tmo = xp->lft.soft_use_expires_seconds +
198 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
199 if (tmo <= 0) {
200 warn = 1;
201 tmo = XFRM_KM_TIMEOUT;
202 }
203 if (tmo < next)
204 next = tmo;
205 }
206
207 if (warn)
6c5c8ca7 208 km_policy_expired(xp, dir, 0, 0);
1da177e4
LT
209 if (next != LONG_MAX &&
210 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
211 xfrm_pol_hold(xp);
212
213out:
214 read_unlock(&xp->lock);
215 xfrm_pol_put(xp);
216 return;
217
218expired:
219 read_unlock(&xp->lock);
4666faab 220 if (!xfrm_policy_delete(xp, dir))
6c5c8ca7 221 km_policy_expired(xp, dir, 1, 0);
1da177e4
LT
222 xfrm_pol_put(xp);
223}
224
225
226/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
227 * SPD calls.
228 */
229
0331b1f3 230struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
1da177e4
LT
231{
232 struct xfrm_policy *policy;
233
0da974f4 234 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
1da177e4
LT
235
236 if (policy) {
0331b1f3 237 write_pnet(&policy->xp_net, net);
12a169e7 238 INIT_LIST_HEAD(&policy->walk.all);
2518c7c2
DM
239 INIT_HLIST_NODE(&policy->bydst);
240 INIT_HLIST_NODE(&policy->byidx);
1da177e4 241 rwlock_init(&policy->lock);
2518c7c2 242 atomic_set(&policy->refcnt, 1);
b24b8a24
PE
243 setup_timer(&policy->timer, xfrm_policy_timer,
244 (unsigned long)policy);
1da177e4
LT
245 }
246 return policy;
247}
248EXPORT_SYMBOL(xfrm_policy_alloc);
249
250/* Destroy xfrm_policy: descendant resources must be released to this moment. */
251
64c31b3f 252void xfrm_policy_destroy(struct xfrm_policy *policy)
1da177e4 253{
12a169e7 254 BUG_ON(!policy->walk.dead);
1da177e4 255
09a62660 256 BUG_ON(policy->bundles);
1da177e4
LT
257
258 if (del_timer(&policy->timer))
259 BUG();
260
03e1ad7b 261 security_xfrm_policy_free(policy->security);
1da177e4
LT
262 kfree(policy);
263}
64c31b3f 264EXPORT_SYMBOL(xfrm_policy_destroy);
1da177e4
LT
265
266static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
267{
268 struct dst_entry *dst;
269
270 while ((dst = policy->bundles) != NULL) {
271 policy->bundles = dst->next;
272 dst_free(dst);
273 }
274
275 if (del_timer(&policy->timer))
276 atomic_dec(&policy->refcnt);
277
278 if (atomic_read(&policy->refcnt) > 1)
279 flow_cache_flush();
280
281 xfrm_pol_put(policy);
282}
283
c4028958 284static void xfrm_policy_gc_task(struct work_struct *work)
1da177e4
LT
285{
286 struct xfrm_policy *policy;
2518c7c2
DM
287 struct hlist_node *entry, *tmp;
288 struct hlist_head gc_list;
1da177e4
LT
289
290 spin_lock_bh(&xfrm_policy_gc_lock);
2518c7c2
DM
291 gc_list.first = xfrm_policy_gc_list.first;
292 INIT_HLIST_HEAD(&xfrm_policy_gc_list);
1da177e4
LT
293 spin_unlock_bh(&xfrm_policy_gc_lock);
294
2518c7c2 295 hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
1da177e4 296 xfrm_policy_gc_kill(policy);
1da177e4 297}
c9583969 298static DECLARE_WORK(xfrm_policy_gc_work, xfrm_policy_gc_task);
1da177e4
LT
299
300/* Rule must be locked. Release descentant resources, announce
301 * entry dead. The rule must be unlinked from lists to the moment.
302 */
303
304static void xfrm_policy_kill(struct xfrm_policy *policy)
305{
306 int dead;
307
308 write_lock_bh(&policy->lock);
12a169e7
HX
309 dead = policy->walk.dead;
310 policy->walk.dead = 1;
1da177e4
LT
311 write_unlock_bh(&policy->lock);
312
313 if (unlikely(dead)) {
314 WARN_ON(1);
315 return;
316 }
317
bbb770e7 318 spin_lock_bh(&xfrm_policy_gc_lock);
2518c7c2 319 hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
bbb770e7 320 spin_unlock_bh(&xfrm_policy_gc_lock);
1da177e4
LT
321
322 schedule_work(&xfrm_policy_gc_work);
323}
324
2518c7c2
DM
325struct xfrm_policy_hash {
326 struct hlist_head *table;
327 unsigned int hmask;
328};
329
330static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2];
331static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly;
2518c7c2
DM
332static unsigned int xfrm_idx_hmask __read_mostly;
333static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
334
2518c7c2
DM
335static inline unsigned int idx_hash(u32 index)
336{
337 return __idx_hash(index, xfrm_idx_hmask);
338}
339
2518c7c2
DM
340static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir)
341{
342 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
343 unsigned int hash = __sel_hash(sel, family, hmask);
344
345 return (hash == hmask + 1 ?
346 &xfrm_policy_inexact[dir] :
347 xfrm_policy_bydst[dir].table + hash);
348}
349
350static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
351{
352 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
353 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
354
355 return xfrm_policy_bydst[dir].table + hash;
356}
357
2518c7c2
DM
358static void xfrm_dst_hash_transfer(struct hlist_head *list,
359 struct hlist_head *ndsttable,
360 unsigned int nhashmask)
361{
b791160b 362 struct hlist_node *entry, *tmp, *entry0 = NULL;
2518c7c2 363 struct xfrm_policy *pol;
b791160b 364 unsigned int h0 = 0;
2518c7c2 365
b791160b 366redo:
2518c7c2
DM
367 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
368 unsigned int h;
369
370 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
371 pol->family, nhashmask);
b791160b
YH
372 if (!entry0) {
373 hlist_del(entry);
374 hlist_add_head(&pol->bydst, ndsttable+h);
375 h0 = h;
376 } else {
377 if (h != h0)
378 continue;
379 hlist_del(entry);
380 hlist_add_after(entry0, &pol->bydst);
381 }
382 entry0 = entry;
383 }
384 if (!hlist_empty(list)) {
385 entry0 = NULL;
386 goto redo;
2518c7c2
DM
387 }
388}
389
390static void xfrm_idx_hash_transfer(struct hlist_head *list,
391 struct hlist_head *nidxtable,
392 unsigned int nhashmask)
393{
394 struct hlist_node *entry, *tmp;
395 struct xfrm_policy *pol;
396
397 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
398 unsigned int h;
399
400 h = __idx_hash(pol->index, nhashmask);
401 hlist_add_head(&pol->byidx, nidxtable+h);
402 }
403}
404
405static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
406{
407 return ((old_hmask + 1) << 1) - 1;
408}
409
410static void xfrm_bydst_resize(int dir)
411{
412 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
413 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
414 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
415 struct hlist_head *odst = xfrm_policy_bydst[dir].table;
44e36b42 416 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
2518c7c2
DM
417 int i;
418
419 if (!ndst)
420 return;
421
422 write_lock_bh(&xfrm_policy_lock);
423
424 for (i = hmask; i >= 0; i--)
425 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
426
427 xfrm_policy_bydst[dir].table = ndst;
428 xfrm_policy_bydst[dir].hmask = nhashmask;
429
430 write_unlock_bh(&xfrm_policy_lock);
431
44e36b42 432 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM
433}
434
435static void xfrm_byidx_resize(int total)
436{
437 unsigned int hmask = xfrm_idx_hmask;
438 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
439 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
93b851c1 440 struct hlist_head *oidx = init_net.xfrm.policy_byidx;
44e36b42 441 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
2518c7c2
DM
442 int i;
443
444 if (!nidx)
445 return;
446
447 write_lock_bh(&xfrm_policy_lock);
448
449 for (i = hmask; i >= 0; i--)
450 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
451
93b851c1 452 init_net.xfrm.policy_byidx = nidx;
2518c7c2
DM
453 xfrm_idx_hmask = nhashmask;
454
455 write_unlock_bh(&xfrm_policy_lock);
456
44e36b42 457 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
2518c7c2
DM
458}
459
460static inline int xfrm_bydst_should_resize(int dir, int *total)
461{
462 unsigned int cnt = xfrm_policy_count[dir];
463 unsigned int hmask = xfrm_policy_bydst[dir].hmask;
464
465 if (total)
466 *total += cnt;
467
468 if ((hmask + 1) < xfrm_policy_hashmax &&
469 cnt > hmask)
470 return 1;
471
472 return 0;
473}
474
475static inline int xfrm_byidx_should_resize(int total)
476{
477 unsigned int hmask = xfrm_idx_hmask;
478
479 if ((hmask + 1) < xfrm_policy_hashmax &&
480 total > hmask)
481 return 1;
482
483 return 0;
484}
485
5a6d3416 486void xfrm_spd_getinfo(struct xfrmk_spdinfo *si)
ecfd6b18
JHS
487{
488 read_lock_bh(&xfrm_policy_lock);
489 si->incnt = xfrm_policy_count[XFRM_POLICY_IN];
490 si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT];
491 si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD];
492 si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
493 si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
494 si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
495 si->spdhcnt = xfrm_idx_hmask;
496 si->spdhmcnt = xfrm_policy_hashmax;
497 read_unlock_bh(&xfrm_policy_lock);
498}
499EXPORT_SYMBOL(xfrm_spd_getinfo);
2518c7c2 500
ecfd6b18 501static DEFINE_MUTEX(hash_resize_mutex);
c4028958 502static void xfrm_hash_resize(struct work_struct *__unused)
2518c7c2
DM
503{
504 int dir, total;
505
506 mutex_lock(&hash_resize_mutex);
507
508 total = 0;
509 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
510 if (xfrm_bydst_should_resize(dir, &total))
511 xfrm_bydst_resize(dir);
512 }
513 if (xfrm_byidx_should_resize(total))
514 xfrm_byidx_resize(total);
515
516 mutex_unlock(&hash_resize_mutex);
517}
518
c4028958 519static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize);
2518c7c2 520
1da177e4
LT
521/* Generate new index... KAME seems to generate them ordered by cost
522 * of an absolute inpredictability of ordering of rules. This will not pass. */
7a12122c 523static u32 xfrm_gen_index(int dir)
1da177e4 524{
1da177e4
LT
525 static u32 idx_generator;
526
527 for (;;) {
2518c7c2
DM
528 struct hlist_node *entry;
529 struct hlist_head *list;
530 struct xfrm_policy *p;
531 u32 idx;
532 int found;
533
1da177e4
LT
534 idx = (idx_generator | dir);
535 idx_generator += 8;
536 if (idx == 0)
537 idx = 8;
93b851c1 538 list = init_net.xfrm.policy_byidx + idx_hash(idx);
2518c7c2
DM
539 found = 0;
540 hlist_for_each_entry(p, entry, list, byidx) {
541 if (p->index == idx) {
542 found = 1;
1da177e4 543 break;
2518c7c2 544 }
1da177e4 545 }
2518c7c2 546 if (!found)
1da177e4
LT
547 return idx;
548 }
549}
550
2518c7c2
DM
551static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
552{
553 u32 *p1 = (u32 *) s1;
554 u32 *p2 = (u32 *) s2;
555 int len = sizeof(struct xfrm_selector) / sizeof(u32);
556 int i;
557
558 for (i = 0; i < len; i++) {
559 if (p1[i] != p2[i])
560 return 1;
561 }
562
563 return 0;
564}
565
1da177e4
LT
566int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
567{
2518c7c2
DM
568 struct xfrm_policy *pol;
569 struct xfrm_policy *delpol;
570 struct hlist_head *chain;
a6c7ab55 571 struct hlist_node *entry, *newpos;
9b78a82c 572 struct dst_entry *gc_list;
1da177e4
LT
573
574 write_lock_bh(&xfrm_policy_lock);
2518c7c2
DM
575 chain = policy_hash_bysel(&policy->selector, policy->family, dir);
576 delpol = NULL;
577 newpos = NULL;
2518c7c2 578 hlist_for_each_entry(pol, entry, chain, bydst) {
a6c7ab55 579 if (pol->type == policy->type &&
2518c7c2 580 !selector_cmp(&pol->selector, &policy->selector) &&
a6c7ab55
HX
581 xfrm_sec_ctx_match(pol->security, policy->security) &&
582 !WARN_ON(delpol)) {
1da177e4
LT
583 if (excl) {
584 write_unlock_bh(&xfrm_policy_lock);
585 return -EEXIST;
586 }
1da177e4
LT
587 delpol = pol;
588 if (policy->priority > pol->priority)
589 continue;
590 } else if (policy->priority >= pol->priority) {
a6c7ab55 591 newpos = &pol->bydst;
1da177e4
LT
592 continue;
593 }
1da177e4
LT
594 if (delpol)
595 break;
1da177e4
LT
596 }
597 if (newpos)
2518c7c2
DM
598 hlist_add_after(newpos, &policy->bydst);
599 else
600 hlist_add_head(&policy->bydst, chain);
1da177e4 601 xfrm_pol_hold(policy);
2518c7c2 602 xfrm_policy_count[dir]++;
1da177e4 603 atomic_inc(&flow_cache_genid);
2518c7c2
DM
604 if (delpol) {
605 hlist_del(&delpol->bydst);
606 hlist_del(&delpol->byidx);
12a169e7 607 list_del(&delpol->walk.all);
2518c7c2
DM
608 xfrm_policy_count[dir]--;
609 }
7a12122c 610 policy->index = delpol ? delpol->index : xfrm_gen_index(dir);
93b851c1 611 hlist_add_head(&policy->byidx, init_net.xfrm.policy_byidx+idx_hash(policy->index));
9d729f72 612 policy->curlft.add_time = get_seconds();
1da177e4
LT
613 policy->curlft.use_time = 0;
614 if (!mod_timer(&policy->timer, jiffies + HZ))
615 xfrm_pol_hold(policy);
adfcf0b2 616 list_add(&policy->walk.all, &init_net.xfrm.policy_all);
1da177e4
LT
617 write_unlock_bh(&xfrm_policy_lock);
618
9b78a82c 619 if (delpol)
1da177e4 620 xfrm_policy_kill(delpol);
2518c7c2
DM
621 else if (xfrm_bydst_should_resize(dir, NULL))
622 schedule_work(&xfrm_hash_work);
9b78a82c
DM
623
624 read_lock_bh(&xfrm_policy_lock);
625 gc_list = NULL;
2518c7c2
DM
626 entry = &policy->bydst;
627 hlist_for_each_entry_continue(policy, entry, bydst) {
9b78a82c
DM
628 struct dst_entry *dst;
629
630 write_lock(&policy->lock);
631 dst = policy->bundles;
632 if (dst) {
633 struct dst_entry *tail = dst;
634 while (tail->next)
635 tail = tail->next;
636 tail->next = gc_list;
637 gc_list = dst;
638
639 policy->bundles = NULL;
640 }
641 write_unlock(&policy->lock);
1da177e4 642 }
9b78a82c
DM
643 read_unlock_bh(&xfrm_policy_lock);
644
645 while (gc_list) {
646 struct dst_entry *dst = gc_list;
647
648 gc_list = dst->next;
649 dst_free(dst);
650 }
651
1da177e4
LT
652 return 0;
653}
654EXPORT_SYMBOL(xfrm_policy_insert);
655
4e81bb83
MN
656struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
657 struct xfrm_selector *sel,
ef41aaa0
EP
658 struct xfrm_sec_ctx *ctx, int delete,
659 int *err)
1da177e4 660{
2518c7c2
DM
661 struct xfrm_policy *pol, *ret;
662 struct hlist_head *chain;
663 struct hlist_node *entry;
1da177e4 664
ef41aaa0 665 *err = 0;
1da177e4 666 write_lock_bh(&xfrm_policy_lock);
2518c7c2
DM
667 chain = policy_hash_bysel(sel, sel->family, dir);
668 ret = NULL;
669 hlist_for_each_entry(pol, entry, chain, bydst) {
670 if (pol->type == type &&
671 !selector_cmp(sel, &pol->selector) &&
672 xfrm_sec_ctx_match(ctx, pol->security)) {
1da177e4 673 xfrm_pol_hold(pol);
2518c7c2 674 if (delete) {
03e1ad7b
PM
675 *err = security_xfrm_policy_delete(
676 pol->security);
ef41aaa0
EP
677 if (*err) {
678 write_unlock_bh(&xfrm_policy_lock);
679 return pol;
680 }
2518c7c2
DM
681 hlist_del(&pol->bydst);
682 hlist_del(&pol->byidx);
12a169e7 683 list_del(&pol->walk.all);
2518c7c2
DM
684 xfrm_policy_count[dir]--;
685 }
686 ret = pol;
1da177e4
LT
687 break;
688 }
689 }
690 write_unlock_bh(&xfrm_policy_lock);
691
2518c7c2 692 if (ret && delete) {
1da177e4 693 atomic_inc(&flow_cache_genid);
2518c7c2 694 xfrm_policy_kill(ret);
1da177e4 695 }
2518c7c2 696 return ret;
1da177e4 697}
df71837d 698EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
1da177e4 699
ef41aaa0
EP
700struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete,
701 int *err)
1da177e4 702{
2518c7c2
DM
703 struct xfrm_policy *pol, *ret;
704 struct hlist_head *chain;
705 struct hlist_node *entry;
1da177e4 706
b5505c6e
HX
707 *err = -ENOENT;
708 if (xfrm_policy_id2dir(id) != dir)
709 return NULL;
710
ef41aaa0 711 *err = 0;
1da177e4 712 write_lock_bh(&xfrm_policy_lock);
93b851c1 713 chain = init_net.xfrm.policy_byidx + idx_hash(id);
2518c7c2
DM
714 ret = NULL;
715 hlist_for_each_entry(pol, entry, chain, byidx) {
716 if (pol->type == type && pol->index == id) {
1da177e4 717 xfrm_pol_hold(pol);
2518c7c2 718 if (delete) {
03e1ad7b
PM
719 *err = security_xfrm_policy_delete(
720 pol->security);
ef41aaa0
EP
721 if (*err) {
722 write_unlock_bh(&xfrm_policy_lock);
723 return pol;
724 }
2518c7c2
DM
725 hlist_del(&pol->bydst);
726 hlist_del(&pol->byidx);
12a169e7 727 list_del(&pol->walk.all);
2518c7c2
DM
728 xfrm_policy_count[dir]--;
729 }
730 ret = pol;
1da177e4
LT
731 break;
732 }
733 }
734 write_unlock_bh(&xfrm_policy_lock);
735
2518c7c2 736 if (ret && delete) {
1da177e4 737 atomic_inc(&flow_cache_genid);
2518c7c2 738 xfrm_policy_kill(ret);
1da177e4 739 }
2518c7c2 740 return ret;
1da177e4
LT
741}
742EXPORT_SYMBOL(xfrm_policy_byid);
743
4aa2e62c
JL
744#ifdef CONFIG_SECURITY_NETWORK_XFRM
745static inline int
746xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info)
1da177e4 747{
4aa2e62c
JL
748 int dir, err = 0;
749
750 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
751 struct xfrm_policy *pol;
752 struct hlist_node *entry;
753 int i;
754
755 hlist_for_each_entry(pol, entry,
756 &xfrm_policy_inexact[dir], bydst) {
757 if (pol->type != type)
758 continue;
03e1ad7b 759 err = security_xfrm_policy_delete(pol->security);
4aa2e62c 760 if (err) {
ab5f5e8b
JL
761 xfrm_audit_policy_delete(pol, 0,
762 audit_info->loginuid,
2532386f 763 audit_info->sessionid,
ab5f5e8b 764 audit_info->secid);
4aa2e62c
JL
765 return err;
766 }
7dc12d6d 767 }
4aa2e62c
JL
768 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
769 hlist_for_each_entry(pol, entry,
770 xfrm_policy_bydst[dir].table + i,
771 bydst) {
772 if (pol->type != type)
773 continue;
03e1ad7b
PM
774 err = security_xfrm_policy_delete(
775 pol->security);
4aa2e62c 776 if (err) {
ab5f5e8b
JL
777 xfrm_audit_policy_delete(pol, 0,
778 audit_info->loginuid,
2532386f 779 audit_info->sessionid,
ab5f5e8b 780 audit_info->secid);
4aa2e62c
JL
781 return err;
782 }
783 }
784 }
785 }
786 return err;
787}
788#else
789static inline int
790xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info)
791{
792 return 0;
793}
794#endif
795
796int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info)
797{
798 int dir, err = 0;
1da177e4
LT
799
800 write_lock_bh(&xfrm_policy_lock);
4aa2e62c
JL
801
802 err = xfrm_policy_flush_secctx_check(type, audit_info);
803 if (err)
804 goto out;
805
1da177e4 806 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
2518c7c2
DM
807 struct xfrm_policy *pol;
808 struct hlist_node *entry;
ae8c0577 809 int i, killed;
2518c7c2 810
ae8c0577 811 killed = 0;
2518c7c2
DM
812 again1:
813 hlist_for_each_entry(pol, entry,
814 &xfrm_policy_inexact[dir], bydst) {
815 if (pol->type != type)
816 continue;
817 hlist_del(&pol->bydst);
818 hlist_del(&pol->byidx);
1da177e4
LT
819 write_unlock_bh(&xfrm_policy_lock);
820
ab5f5e8b 821 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
2532386f 822 audit_info->sessionid,
ab5f5e8b 823 audit_info->secid);
161a09e7 824
2518c7c2 825 xfrm_policy_kill(pol);
ae8c0577 826 killed++;
1da177e4
LT
827
828 write_lock_bh(&xfrm_policy_lock);
2518c7c2
DM
829 goto again1;
830 }
831
832 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
833 again2:
834 hlist_for_each_entry(pol, entry,
835 xfrm_policy_bydst[dir].table + i,
836 bydst) {
837 if (pol->type != type)
838 continue;
839 hlist_del(&pol->bydst);
840 hlist_del(&pol->byidx);
12a169e7 841 list_del(&pol->walk.all);
2518c7c2
DM
842 write_unlock_bh(&xfrm_policy_lock);
843
ab5f5e8b
JL
844 xfrm_audit_policy_delete(pol, 1,
845 audit_info->loginuid,
2532386f 846 audit_info->sessionid,
ab5f5e8b 847 audit_info->secid);
2518c7c2 848 xfrm_policy_kill(pol);
ae8c0577 849 killed++;
2518c7c2
DM
850
851 write_lock_bh(&xfrm_policy_lock);
852 goto again2;
853 }
1da177e4 854 }
2518c7c2 855
ae8c0577 856 xfrm_policy_count[dir] -= killed;
1da177e4
LT
857 }
858 atomic_inc(&flow_cache_genid);
4aa2e62c 859out:
1da177e4 860 write_unlock_bh(&xfrm_policy_lock);
4aa2e62c 861 return err;
1da177e4
LT
862}
863EXPORT_SYMBOL(xfrm_policy_flush);
864
4c563f76
TT
865int xfrm_policy_walk(struct xfrm_policy_walk *walk,
866 int (*func)(struct xfrm_policy *, int, int, void*),
1da177e4
LT
867 void *data)
868{
12a169e7
HX
869 struct xfrm_policy *pol;
870 struct xfrm_policy_walk_entry *x;
4c563f76
TT
871 int error = 0;
872
873 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
874 walk->type != XFRM_POLICY_TYPE_ANY)
875 return -EINVAL;
1da177e4 876
12a169e7 877 if (list_empty(&walk->walk.all) && walk->seq != 0)
4c563f76
TT
878 return 0;
879
12a169e7
HX
880 write_lock_bh(&xfrm_policy_lock);
881 if (list_empty(&walk->walk.all))
adfcf0b2 882 x = list_first_entry(&init_net.xfrm.policy_all, struct xfrm_policy_walk_entry, all);
12a169e7
HX
883 else
884 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
adfcf0b2 885 list_for_each_entry_from(x, &init_net.xfrm.policy_all, all) {
12a169e7 886 if (x->dead)
4c563f76 887 continue;
12a169e7
HX
888 pol = container_of(x, struct xfrm_policy, walk);
889 if (walk->type != XFRM_POLICY_TYPE_ANY &&
890 walk->type != pol->type)
891 continue;
892 error = func(pol, xfrm_policy_id2dir(pol->index),
893 walk->seq, data);
894 if (error) {
895 list_move_tail(&walk->walk.all, &x->all);
896 goto out;
2518c7c2 897 }
12a169e7 898 walk->seq++;
1da177e4 899 }
12a169e7 900 if (walk->seq == 0) {
baf5d743
JHS
901 error = -ENOENT;
902 goto out;
903 }
12a169e7 904 list_del_init(&walk->walk.all);
1da177e4 905out:
12a169e7 906 write_unlock_bh(&xfrm_policy_lock);
1da177e4
LT
907 return error;
908}
909EXPORT_SYMBOL(xfrm_policy_walk);
910
12a169e7
HX
911void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
912{
913 INIT_LIST_HEAD(&walk->walk.all);
914 walk->walk.dead = 1;
915 walk->type = type;
916 walk->seq = 0;
917}
918EXPORT_SYMBOL(xfrm_policy_walk_init);
919
920void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
921{
922 if (list_empty(&walk->walk.all))
923 return;
924
925 write_lock_bh(&xfrm_policy_lock);
926 list_del(&walk->walk.all);
927 write_unlock_bh(&xfrm_policy_lock);
928}
929EXPORT_SYMBOL(xfrm_policy_walk_done);
930
134b0fc5
JM
931/*
932 * Find policy to apply to this flow.
933 *
934 * Returns 0 if policy found, else an -errno.
935 */
2518c7c2
DM
936static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
937 u8 type, u16 family, int dir)
1da177e4 938{
2518c7c2 939 struct xfrm_selector *sel = &pol->selector;
134b0fc5 940 int match, ret = -ESRCH;
1da177e4 941
2518c7c2
DM
942 if (pol->family != family ||
943 pol->type != type)
134b0fc5 944 return ret;
1da177e4 945
2518c7c2 946 match = xfrm_selector_match(sel, fl, family);
134b0fc5 947 if (match)
03e1ad7b
PM
948 ret = security_xfrm_policy_lookup(pol->security, fl->secid,
949 dir);
2518c7c2 950
134b0fc5 951 return ret;
2518c7c2 952}
1da177e4 953
2518c7c2
DM
954static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl,
955 u16 family, u8 dir)
956{
134b0fc5 957 int err;
2518c7c2
DM
958 struct xfrm_policy *pol, *ret;
959 xfrm_address_t *daddr, *saddr;
960 struct hlist_node *entry;
961 struct hlist_head *chain;
acba48e1 962 u32 priority = ~0U;
df71837d 963
2518c7c2
DM
964 daddr = xfrm_flowi_daddr(fl, family);
965 saddr = xfrm_flowi_saddr(fl, family);
966 if (unlikely(!daddr || !saddr))
967 return NULL;
968
969 read_lock_bh(&xfrm_policy_lock);
970 chain = policy_hash_direct(daddr, saddr, family, dir);
971 ret = NULL;
972 hlist_for_each_entry(pol, entry, chain, bydst) {
134b0fc5
JM
973 err = xfrm_policy_match(pol, fl, type, family, dir);
974 if (err) {
975 if (err == -ESRCH)
976 continue;
977 else {
978 ret = ERR_PTR(err);
979 goto fail;
980 }
981 } else {
2518c7c2 982 ret = pol;
acba48e1 983 priority = ret->priority;
2518c7c2
DM
984 break;
985 }
986 }
acba48e1
DM
987 chain = &xfrm_policy_inexact[dir];
988 hlist_for_each_entry(pol, entry, chain, bydst) {
134b0fc5
JM
989 err = xfrm_policy_match(pol, fl, type, family, dir);
990 if (err) {
991 if (err == -ESRCH)
992 continue;
993 else {
994 ret = ERR_PTR(err);
995 goto fail;
996 }
997 } else if (pol->priority < priority) {
acba48e1
DM
998 ret = pol;
999 break;
1da177e4
LT
1000 }
1001 }
acba48e1
DM
1002 if (ret)
1003 xfrm_pol_hold(ret);
134b0fc5 1004fail:
1da177e4 1005 read_unlock_bh(&xfrm_policy_lock);
4e81bb83 1006
2518c7c2 1007 return ret;
4e81bb83
MN
1008}
1009
134b0fc5 1010static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
4e81bb83
MN
1011 void **objp, atomic_t **obj_refp)
1012{
1013 struct xfrm_policy *pol;
134b0fc5 1014 int err = 0;
4e81bb83
MN
1015
1016#ifdef CONFIG_XFRM_SUB_POLICY
1017 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir);
134b0fc5
JM
1018 if (IS_ERR(pol)) {
1019 err = PTR_ERR(pol);
1020 pol = NULL;
1021 }
1022 if (pol || err)
4e81bb83
MN
1023 goto end;
1024#endif
1025 pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir);
134b0fc5
JM
1026 if (IS_ERR(pol)) {
1027 err = PTR_ERR(pol);
1028 pol = NULL;
1029 }
4e81bb83 1030#ifdef CONFIG_XFRM_SUB_POLICY
2518c7c2 1031end:
4e81bb83 1032#endif
1da177e4
LT
1033 if ((*objp = (void *) pol) != NULL)
1034 *obj_refp = &pol->refcnt;
134b0fc5 1035 return err;
1da177e4
LT
1036}
1037
df71837d
TJ
1038static inline int policy_to_flow_dir(int dir)
1039{
1040 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
a716c119
YH
1041 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
1042 XFRM_POLICY_FWD == FLOW_DIR_FWD)
1043 return dir;
1044 switch (dir) {
1045 default:
1046 case XFRM_POLICY_IN:
1047 return FLOW_DIR_IN;
1048 case XFRM_POLICY_OUT:
1049 return FLOW_DIR_OUT;
1050 case XFRM_POLICY_FWD:
1051 return FLOW_DIR_FWD;
3ff50b79 1052 }
df71837d
TJ
1053}
1054
e0d1caa7 1055static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
1da177e4
LT
1056{
1057 struct xfrm_policy *pol;
1058
1059 read_lock_bh(&xfrm_policy_lock);
1060 if ((pol = sk->sk_policy[dir]) != NULL) {
a716c119 1061 int match = xfrm_selector_match(&pol->selector, fl,
1da177e4 1062 sk->sk_family);
a716c119 1063 int err = 0;
df71837d 1064
3bccfbc7 1065 if (match) {
03e1ad7b
PM
1066 err = security_xfrm_policy_lookup(pol->security,
1067 fl->secid,
1068 policy_to_flow_dir(dir));
3bccfbc7
VY
1069 if (!err)
1070 xfrm_pol_hold(pol);
1071 else if (err == -ESRCH)
1072 pol = NULL;
1073 else
1074 pol = ERR_PTR(err);
1075 } else
1da177e4
LT
1076 pol = NULL;
1077 }
1078 read_unlock_bh(&xfrm_policy_lock);
1079 return pol;
1080}
1081
1082static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1083{
2518c7c2
DM
1084 struct hlist_head *chain = policy_hash_bysel(&pol->selector,
1085 pol->family, dir);
4e81bb83 1086
adfcf0b2 1087 list_add(&pol->walk.all, &init_net.xfrm.policy_all);
2518c7c2 1088 hlist_add_head(&pol->bydst, chain);
93b851c1 1089 hlist_add_head(&pol->byidx, init_net.xfrm.policy_byidx+idx_hash(pol->index));
2518c7c2 1090 xfrm_policy_count[dir]++;
1da177e4 1091 xfrm_pol_hold(pol);
2518c7c2
DM
1092
1093 if (xfrm_bydst_should_resize(dir, NULL))
1094 schedule_work(&xfrm_hash_work);
1da177e4
LT
1095}
1096
1097static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1098 int dir)
1099{
2518c7c2
DM
1100 if (hlist_unhashed(&pol->bydst))
1101 return NULL;
1da177e4 1102
2518c7c2
DM
1103 hlist_del(&pol->bydst);
1104 hlist_del(&pol->byidx);
12a169e7 1105 list_del(&pol->walk.all);
2518c7c2
DM
1106 xfrm_policy_count[dir]--;
1107
1108 return pol;
1da177e4
LT
1109}
1110
4666faab 1111int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1da177e4
LT
1112{
1113 write_lock_bh(&xfrm_policy_lock);
1114 pol = __xfrm_policy_unlink(pol, dir);
1115 write_unlock_bh(&xfrm_policy_lock);
1116 if (pol) {
1117 if (dir < XFRM_POLICY_MAX)
1118 atomic_inc(&flow_cache_genid);
1119 xfrm_policy_kill(pol);
4666faab 1120 return 0;
1da177e4 1121 }
4666faab 1122 return -ENOENT;
1da177e4 1123}
a70fcb0b 1124EXPORT_SYMBOL(xfrm_policy_delete);
1da177e4
LT
1125
1126int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1127{
1128 struct xfrm_policy *old_pol;
1129
4e81bb83
MN
1130#ifdef CONFIG_XFRM_SUB_POLICY
1131 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1132 return -EINVAL;
1133#endif
1134
1da177e4
LT
1135 write_lock_bh(&xfrm_policy_lock);
1136 old_pol = sk->sk_policy[dir];
1137 sk->sk_policy[dir] = pol;
1138 if (pol) {
9d729f72 1139 pol->curlft.add_time = get_seconds();
7a12122c 1140 pol->index = xfrm_gen_index(XFRM_POLICY_MAX+dir);
1da177e4
LT
1141 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1142 }
1143 if (old_pol)
1144 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1145 write_unlock_bh(&xfrm_policy_lock);
1146
1147 if (old_pol) {
1148 xfrm_policy_kill(old_pol);
1149 }
1150 return 0;
1151}
1152
1153static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1154{
0331b1f3 1155 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1da177e4
LT
1156
1157 if (newp) {
1158 newp->selector = old->selector;
03e1ad7b
PM
1159 if (security_xfrm_policy_clone(old->security,
1160 &newp->security)) {
df71837d
TJ
1161 kfree(newp);
1162 return NULL; /* ENOMEM */
1163 }
1da177e4
LT
1164 newp->lft = old->lft;
1165 newp->curlft = old->curlft;
1166 newp->action = old->action;
1167 newp->flags = old->flags;
1168 newp->xfrm_nr = old->xfrm_nr;
1169 newp->index = old->index;
4e81bb83 1170 newp->type = old->type;
1da177e4
LT
1171 memcpy(newp->xfrm_vec, old->xfrm_vec,
1172 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1173 write_lock_bh(&xfrm_policy_lock);
1174 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1175 write_unlock_bh(&xfrm_policy_lock);
1176 xfrm_pol_put(newp);
1177 }
1178 return newp;
1179}
1180
1181int __xfrm_sk_clone_policy(struct sock *sk)
1182{
1183 struct xfrm_policy *p0 = sk->sk_policy[0],
1184 *p1 = sk->sk_policy[1];
1185
1186 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1187 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1188 return -ENOMEM;
1189 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1190 return -ENOMEM;
1191 return 0;
1192}
1193
a1e59abf
PM
1194static int
1195xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote,
1196 unsigned short family)
1197{
1198 int err;
1199 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1200
1201 if (unlikely(afinfo == NULL))
1202 return -EINVAL;
1203 err = afinfo->get_saddr(local, remote);
1204 xfrm_policy_put_afinfo(afinfo);
1205 return err;
1206}
1207
1da177e4
LT
1208/* Resolve list of templates for the flow, given policy. */
1209
1210static int
4e81bb83
MN
1211xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1212 struct xfrm_state **xfrm,
1213 unsigned short family)
1da177e4
LT
1214{
1215 int nx;
1216 int i, error;
1217 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1218 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
a1e59abf 1219 xfrm_address_t tmp;
1da177e4
LT
1220
1221 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1222 struct xfrm_state *x;
1223 xfrm_address_t *remote = daddr;
1224 xfrm_address_t *local = saddr;
1225 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1226
48b8d783
JK
1227 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1228 tmpl->mode == XFRM_MODE_BEET) {
1da177e4
LT
1229 remote = &tmpl->id.daddr;
1230 local = &tmpl->saddr;
76b3f055 1231 family = tmpl->encap_family;
a1e59abf
PM
1232 if (xfrm_addr_any(local, family)) {
1233 error = xfrm_get_saddr(&tmp, remote, family);
1234 if (error)
1235 goto fail;
1236 local = &tmp;
1237 }
1da177e4
LT
1238 }
1239
1240 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1241
1242 if (x && x->km.state == XFRM_STATE_VALID) {
1243 xfrm[nx++] = x;
1244 daddr = remote;
1245 saddr = local;
1246 continue;
1247 }
1248 if (x) {
1249 error = (x->km.state == XFRM_STATE_ERROR ?
1250 -EINVAL : -EAGAIN);
1251 xfrm_state_put(x);
1252 }
a4322266 1253 else if (error == -ESRCH)
1254 error = -EAGAIN;
1da177e4
LT
1255
1256 if (!tmpl->optional)
1257 goto fail;
1258 }
1259 return nx;
1260
1261fail:
1262 for (nx--; nx>=0; nx--)
1263 xfrm_state_put(xfrm[nx]);
1264 return error;
1265}
1266
4e81bb83
MN
1267static int
1268xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1269 struct xfrm_state **xfrm,
1270 unsigned short family)
1271{
41a49cc3
MN
1272 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1273 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
4e81bb83
MN
1274 int cnx = 0;
1275 int error;
1276 int ret;
1277 int i;
1278
1279 for (i = 0; i < npols; i++) {
1280 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1281 error = -ENOBUFS;
1282 goto fail;
1283 }
41a49cc3
MN
1284
1285 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
4e81bb83
MN
1286 if (ret < 0) {
1287 error = ret;
1288 goto fail;
1289 } else
1290 cnx += ret;
1291 }
1292
41a49cc3
MN
1293 /* found states are sorted for outbound processing */
1294 if (npols > 1)
1295 xfrm_state_sort(xfrm, tpp, cnx, family);
1296
4e81bb83
MN
1297 return cnx;
1298
1299 fail:
1300 for (cnx--; cnx>=0; cnx--)
41a49cc3 1301 xfrm_state_put(tpp[cnx]);
4e81bb83
MN
1302 return error;
1303
1304}
1305
1da177e4
LT
1306/* Check that the bundle accepts the flow and its components are
1307 * still valid.
1308 */
1309
1310static struct dst_entry *
1311xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
1312{
1313 struct dst_entry *x;
1314 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1315 if (unlikely(afinfo == NULL))
1316 return ERR_PTR(-EINVAL);
1317 x = afinfo->find_bundle(fl, policy);
1318 xfrm_policy_put_afinfo(afinfo);
1319 return x;
1320}
1321
25ee3286
HX
1322static inline int xfrm_get_tos(struct flowi *fl, int family)
1323{
1324 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1325 int tos;
1da177e4 1326
25ee3286
HX
1327 if (!afinfo)
1328 return -EINVAL;
1329
1330 tos = afinfo->get_tos(fl);
1331
1332 xfrm_policy_put_afinfo(afinfo);
1333
1334 return tos;
1335}
1336
1337static inline struct xfrm_dst *xfrm_alloc_dst(int family)
1da177e4 1338{
1da177e4 1339 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
25ee3286
HX
1340 struct xfrm_dst *xdst;
1341
1342 if (!afinfo)
1343 return ERR_PTR(-EINVAL);
1344
1345 xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS);
1346
1347 xfrm_policy_put_afinfo(afinfo);
1348
1349 return xdst;
1350}
1351
a1b05140
MN
1352static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1353 int nfheader_len)
1354{
1355 struct xfrm_policy_afinfo *afinfo =
1356 xfrm_policy_get_afinfo(dst->ops->family);
1357 int err;
1358
1359 if (!afinfo)
1360 return -EINVAL;
1361
1362 err = afinfo->init_path(path, dst, nfheader_len);
1363
1364 xfrm_policy_put_afinfo(afinfo);
1365
1366 return err;
1367}
1368
25ee3286
HX
1369static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
1370{
1371 struct xfrm_policy_afinfo *afinfo =
1372 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1373 int err;
1374
1375 if (!afinfo)
1da177e4 1376 return -EINVAL;
25ee3286
HX
1377
1378 err = afinfo->fill_dst(xdst, dev);
1379
1da177e4 1380 xfrm_policy_put_afinfo(afinfo);
25ee3286 1381
1da177e4
LT
1382 return err;
1383}
1384
25ee3286
HX
1385/* Allocate chain of dst_entry's, attach known xfrm's, calculate
1386 * all the metrics... Shortly, bundle a bundle.
1387 */
1388
1389static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1390 struct xfrm_state **xfrm, int nx,
1391 struct flowi *fl,
1392 struct dst_entry *dst)
1393{
1394 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;
1399 int err;
1400 int header_len = 0;
a1b05140 1401 int nfheader_len = 0;
25ee3286
HX
1402 int trailer_len = 0;
1403 int tos;
1404 int family = policy->selector.family;
9bb182a7
YH
1405 xfrm_address_t saddr, daddr;
1406
1407 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
25ee3286
HX
1408
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++) {
1417 struct xfrm_dst *xdst = xfrm_alloc_dst(family);
1418 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;
9bb182a7
YH
1438 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1439 family);
25ee3286
HX
1440 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];
1447 xdst->genid = xfrm[i]->genid;
1448
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;
a1b05140
MN
1460 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1461 nfheader_len += xfrm[i]->props.header_len;
25ee3286
HX
1462 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
1473 /* Copy neighbout for reachability confirmation */
1474 dst0->neighbour = neigh_clone(dst->neighbour);
1475
a1b05140 1476 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
25ee3286
HX
1477 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
1482 err = xfrm_fill_dst(xdst, dev);
1483 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;
1503}
1504
157bfc25
MN
1505static 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}
1da177e4
LT
1539
1540static int stale_bundle(struct dst_entry *dst);
1541
1542/* Main function: finds/creates a bundle for given flow.
1543 *
1544 * At the moment we eat a raw IP route. Mostly to speed up lookups
1545 * on interfaces with disabled IPsec.
1546 */
14e50e57
DM
1547int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
1548 struct sock *sk, int flags)
1da177e4
LT
1549{
1550 struct xfrm_policy *policy;
4e81bb83
MN
1551 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1552 int npols;
1553 int pol_dead;
1554 int xfrm_nr;
1555 int pi;
1da177e4
LT
1556 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1557 struct dst_entry *dst, *dst_orig = *dst_p;
1558 int nx = 0;
1559 int err;
1560 u32 genid;
42cf93cd 1561 u16 family;
df71837d 1562 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
e0d1caa7 1563
1da177e4
LT
1564restart:
1565 genid = atomic_read(&flow_cache_genid);
1566 policy = NULL;
4e81bb83
MN
1567 for (pi = 0; pi < ARRAY_SIZE(pols); pi++)
1568 pols[pi] = NULL;
1569 npols = 0;
1570 pol_dead = 0;
1571 xfrm_nr = 0;
1572
f7944fb1 1573 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
e0d1caa7 1574 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
75b8c133 1575 err = PTR_ERR(policy);
0aa64774
MN
1576 if (IS_ERR(policy)) {
1577 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
75b8c133 1578 goto dropdst;
0aa64774 1579 }
3bccfbc7 1580 }
1da177e4
LT
1581
1582 if (!policy) {
1583 /* To accelerate a bit... */
2518c7c2
DM
1584 if ((dst_orig->flags & DST_NOXFRM) ||
1585 !xfrm_policy_count[XFRM_POLICY_OUT])
8b7817f3 1586 goto nopol;
1da177e4 1587
e0d1caa7 1588 policy = flow_cache_lookup(fl, dst_orig->ops->family,
42cf93cd 1589 dir, xfrm_policy_lookup);
75b8c133 1590 err = PTR_ERR(policy);
d66e37a9
MN
1591 if (IS_ERR(policy)) {
1592 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
75b8c133 1593 goto dropdst;
d66e37a9 1594 }
1da177e4
LT
1595 }
1596
1597 if (!policy)
8b7817f3 1598 goto nopol;
1da177e4 1599
42cf93cd 1600 family = dst_orig->ops->family;
4e81bb83
MN
1601 pols[0] = policy;
1602 npols ++;
1603 xfrm_nr += pols[0]->xfrm_nr;
1da177e4 1604
aef21785 1605 err = -ENOENT;
8b7817f3
HX
1606 if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP))
1607 goto error;
1608
1609 policy->curlft.use_time = get_seconds();
1610
1da177e4 1611 switch (policy->action) {
5e5234ff 1612 default:
1da177e4
LT
1613 case XFRM_POLICY_BLOCK:
1614 /* Prohibit the flow */
0aa64774 1615 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK);
e104411b
PM
1616 err = -EPERM;
1617 goto error;
1da177e4
LT
1618
1619 case XFRM_POLICY_ALLOW:
4e81bb83 1620#ifndef CONFIG_XFRM_SUB_POLICY
1da177e4
LT
1621 if (policy->xfrm_nr == 0) {
1622 /* Flow passes not transformed. */
1623 xfrm_pol_put(policy);
1624 return 0;
1625 }
4e81bb83 1626#endif
1da177e4
LT
1627
1628 /* Try to find matching bundle.
1629 *
1630 * LATER: help from flow cache. It is optional, this
1631 * is required only for output policy.
1632 */
1633 dst = xfrm_find_bundle(fl, policy, family);
1634 if (IS_ERR(dst)) {
0aa64774 1635 XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
e104411b
PM
1636 err = PTR_ERR(dst);
1637 goto error;
1da177e4
LT
1638 }
1639
1640 if (dst)
1641 break;
1642
4e81bb83
MN
1643#ifdef CONFIG_XFRM_SUB_POLICY
1644 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1645 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1646 fl, family,
1647 XFRM_POLICY_OUT);
1648 if (pols[1]) {
134b0fc5 1649 if (IS_ERR(pols[1])) {
0aa64774 1650 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
134b0fc5
JM
1651 err = PTR_ERR(pols[1]);
1652 goto error;
1653 }
4e81bb83 1654 if (pols[1]->action == XFRM_POLICY_BLOCK) {
0aa64774 1655 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK);
4e81bb83
MN
1656 err = -EPERM;
1657 goto error;
1658 }
1659 npols ++;
1660 xfrm_nr += pols[1]->xfrm_nr;
1661 }
1662 }
1663
1664 /*
1665 * Because neither flowi nor bundle information knows about
1666 * transformation template size. On more than one policy usage
1667 * we can realize whether all of them is bypass or not after
1668 * they are searched. See above not-transformed bypass
1669 * is surrounded by non-sub policy configuration, too.
1670 */
1671 if (xfrm_nr == 0) {
1672 /* Flow passes not transformed. */
1673 xfrm_pols_put(pols, npols);
1674 return 0;
1675 }
1676
1677#endif
1678 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1da177e4
LT
1679
1680 if (unlikely(nx<0)) {
1681 err = nx;
14e50e57
DM
1682 if (err == -EAGAIN && sysctl_xfrm_larval_drop) {
1683 /* EREMOTE tells the caller to generate
1684 * a one-shot blackhole route.
1685 */
d66e37a9 1686 XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
14e50e57
DM
1687 xfrm_pol_put(policy);
1688 return -EREMOTE;
1689 }
815f4e57 1690 if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) {
1da177e4
LT
1691 DECLARE_WAITQUEUE(wait, current);
1692
50a30657 1693 add_wait_queue(&init_net.xfrm.km_waitq, &wait);
1da177e4
LT
1694 set_current_state(TASK_INTERRUPTIBLE);
1695 schedule();
1696 set_current_state(TASK_RUNNING);
50a30657 1697 remove_wait_queue(&init_net.xfrm.km_waitq, &wait);
1da177e4 1698
4e81bb83 1699 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
1da177e4
LT
1700
1701 if (nx == -EAGAIN && signal_pending(current)) {
0aa64774 1702 XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
1da177e4
LT
1703 err = -ERESTART;
1704 goto error;
1705 }
1706 if (nx == -EAGAIN ||
1707 genid != atomic_read(&flow_cache_genid)) {
4e81bb83 1708 xfrm_pols_put(pols, npols);
1da177e4
LT
1709 goto restart;
1710 }
1711 err = nx;
1712 }
0aa64774
MN
1713 if (err < 0) {
1714 XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
1da177e4 1715 goto error;
0aa64774 1716 }
1da177e4
LT
1717 }
1718 if (nx == 0) {
1719 /* Flow passes not transformed. */
4e81bb83 1720 xfrm_pols_put(pols, npols);
1da177e4
LT
1721 return 0;
1722 }
1723
25ee3286
HX
1724 dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig);
1725 err = PTR_ERR(dst);
0aa64774
MN
1726 if (IS_ERR(dst)) {
1727 XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1da177e4 1728 goto error;
0aa64774 1729 }
1da177e4 1730
4e81bb83
MN
1731 for (pi = 0; pi < npols; pi++) {
1732 read_lock_bh(&pols[pi]->lock);
12a169e7 1733 pol_dead |= pols[pi]->walk.dead;
4e81bb83
MN
1734 read_unlock_bh(&pols[pi]->lock);
1735 }
1736
1da177e4 1737 write_lock_bh(&policy->lock);
4e81bb83 1738 if (unlikely(pol_dead || stale_bundle(dst))) {
1da177e4
LT
1739 /* Wow! While we worked on resolving, this
1740 * policy has gone. Retry. It is not paranoia,
1741 * we just cannot enlist new bundle to dead object.
1742 * We can't enlist stable bundles either.
1743 */
1744 write_unlock_bh(&policy->lock);
9d7d7402 1745 dst_free(dst);
00de651d 1746
0aa64774
MN
1747 if (pol_dead)
1748 XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD);
1749 else
1750 XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
00de651d
HX
1751 err = -EHOSTUNREACH;
1752 goto error;
1da177e4 1753 }
157bfc25
MN
1754
1755 if (npols > 1)
1756 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1757 else
1758 err = xfrm_dst_update_origin(dst, fl);
1759 if (unlikely(err)) {
1760 write_unlock_bh(&policy->lock);
9d7d7402 1761 dst_free(dst);
0aa64774 1762 XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
157bfc25
MN
1763 goto error;
1764 }
1765
1da177e4
LT
1766 dst->next = policy->bundles;
1767 policy->bundles = dst;
1768 dst_hold(dst);
1769 write_unlock_bh(&policy->lock);
1770 }
1771 *dst_p = dst;
1772 dst_release(dst_orig);
a716c119 1773 xfrm_pols_put(pols, npols);
1da177e4
LT
1774 return 0;
1775
1776error:
4e81bb83 1777 xfrm_pols_put(pols, npols);
75b8c133
HX
1778dropdst:
1779 dst_release(dst_orig);
1da177e4
LT
1780 *dst_p = NULL;
1781 return err;
8b7817f3
HX
1782
1783nopol:
aef21785 1784 err = -ENOENT;
8b7817f3
HX
1785 if (flags & XFRM_LOOKUP_ICMP)
1786 goto dropdst;
1787 return 0;
1da177e4 1788}
14e50e57
DM
1789EXPORT_SYMBOL(__xfrm_lookup);
1790
1791int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
1792 struct sock *sk, int flags)
1793{
1794 int err = __xfrm_lookup(dst_p, fl, sk, flags);
1795
1796 if (err == -EREMOTE) {
1797 dst_release(*dst_p);
1798 *dst_p = NULL;
1799 err = -EAGAIN;
1800 }
1801
1802 return err;
1803}
1da177e4
LT
1804EXPORT_SYMBOL(xfrm_lookup);
1805
df0ba92a
MN
1806static inline int
1807xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1808{
1809 struct xfrm_state *x;
df0ba92a
MN
1810
1811 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1812 return 0;
1813 x = skb->sp->xvec[idx];
1814 if (!x->type->reject)
1815 return 0;
1ecafede 1816 return x->type->reject(x, skb, fl);
df0ba92a
MN
1817}
1818
1da177e4
LT
1819/* When skb is transformed back to its "native" form, we have to
1820 * check policy restrictions. At the moment we make this in maximally
1821 * stupid way. Shame on me. :-) Of course, connected sockets must
1822 * have policy cached at them.
1823 */
1824
1825static inline int
a716c119 1826xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1da177e4
LT
1827 unsigned short family)
1828{
1829 if (xfrm_state_kern(x))
928ba416 1830 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1da177e4
LT
1831 return x->id.proto == tmpl->id.proto &&
1832 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1833 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1834 x->props.mode == tmpl->mode &&
c5d18e98 1835 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
f3bd4840 1836 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
7e49e6de
MN
1837 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1838 xfrm_state_addr_cmp(tmpl, x, family));
1da177e4
LT
1839}
1840
df0ba92a
MN
1841/*
1842 * 0 or more than 0 is returned when validation is succeeded (either bypass
1843 * because of optional transport mode, or next index of the mathced secpath
1844 * state with the template.
1845 * -1 is returned when no matching template is found.
1846 * Otherwise "-2 - errored_index" is returned.
1847 */
1da177e4
LT
1848static inline int
1849xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1850 unsigned short family)
1851{
1852 int idx = start;
1853
1854 if (tmpl->optional) {
7e49e6de 1855 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1da177e4
LT
1856 return start;
1857 } else
1858 start = -1;
1859 for (; idx < sp->len; idx++) {
dbe5b4aa 1860 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1da177e4 1861 return ++idx;
df0ba92a
MN
1862 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1863 if (start == -1)
1864 start = -2-idx;
1da177e4 1865 break;
df0ba92a 1866 }
1da177e4
LT
1867 }
1868 return start;
1869}
1870
d5422efe
HX
1871int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1872 unsigned int family, int reverse)
1da177e4
LT
1873{
1874 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
e0d1caa7 1875 int err;
1da177e4
LT
1876
1877 if (unlikely(afinfo == NULL))
1878 return -EAFNOSUPPORT;
1879
d5422efe 1880 afinfo->decode_session(skb, fl, reverse);
beb8d13b 1881 err = security_xfrm_decode_session(skb, &fl->secid);
1da177e4 1882 xfrm_policy_put_afinfo(afinfo);
e0d1caa7 1883 return err;
1da177e4 1884}
d5422efe 1885EXPORT_SYMBOL(__xfrm_decode_session);
1da177e4 1886
df0ba92a 1887static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1da177e4
LT
1888{
1889 for (; k < sp->len; k++) {
df0ba92a 1890 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
d1d9facf 1891 *idxp = k;
1da177e4 1892 return 1;
df0ba92a 1893 }
1da177e4
LT
1894 }
1895
1896 return 0;
1897}
1898
a716c119 1899int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1da177e4
LT
1900 unsigned short family)
1901{
1902 struct xfrm_policy *pol;
4e81bb83
MN
1903 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1904 int npols = 0;
1905 int xfrm_nr;
1906 int pi;
d5422efe 1907 int reverse;
1da177e4 1908 struct flowi fl;
d5422efe 1909 u8 fl_dir;
df0ba92a 1910 int xerr_idx = -1;
1da177e4 1911
d5422efe
HX
1912 reverse = dir & ~XFRM_POLICY_MASK;
1913 dir &= XFRM_POLICY_MASK;
1914 fl_dir = policy_to_flow_dir(dir);
1915
0aa64774
MN
1916 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
1917 XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR);
1da177e4 1918 return 0;
0aa64774
MN
1919 }
1920
eb9c7ebe 1921 nf_nat_decode_session(skb, &fl, family);
1da177e4
LT
1922
1923 /* First, check used SA against their selectors. */
1924 if (skb->sp) {
1925 int i;
1926
1927 for (i=skb->sp->len-1; i>=0; i--) {
dbe5b4aa 1928 struct xfrm_state *x = skb->sp->xvec[i];
0aa64774
MN
1929 if (!xfrm_selector_match(&x->sel, &fl, family)) {
1930 XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH);
1da177e4 1931 return 0;
0aa64774 1932 }
1da177e4
LT
1933 }
1934 }
1935
1936 pol = NULL;
3bccfbc7 1937 if (sk && sk->sk_policy[dir]) {
e0d1caa7 1938 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
0aa64774
MN
1939 if (IS_ERR(pol)) {
1940 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
3bccfbc7 1941 return 0;
0aa64774 1942 }
3bccfbc7 1943 }
1da177e4
LT
1944
1945 if (!pol)
e0d1caa7 1946 pol = flow_cache_lookup(&fl, family, fl_dir,
1da177e4
LT
1947 xfrm_policy_lookup);
1948
0aa64774
MN
1949 if (IS_ERR(pol)) {
1950 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
134b0fc5 1951 return 0;
0aa64774 1952 }
134b0fc5 1953
df0ba92a 1954 if (!pol) {
d1d9facf 1955 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
df0ba92a 1956 xfrm_secpath_reject(xerr_idx, skb, &fl);
0aa64774 1957 XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS);
df0ba92a
MN
1958 return 0;
1959 }
1960 return 1;
1961 }
1da177e4 1962
9d729f72 1963 pol->curlft.use_time = get_seconds();
1da177e4 1964
4e81bb83
MN
1965 pols[0] = pol;
1966 npols ++;
1967#ifdef CONFIG_XFRM_SUB_POLICY
1968 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1969 pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
1970 &fl, family,
1971 XFRM_POLICY_IN);
1972 if (pols[1]) {
0aa64774
MN
1973 if (IS_ERR(pols[1])) {
1974 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
134b0fc5 1975 return 0;
0aa64774 1976 }
9d729f72 1977 pols[1]->curlft.use_time = get_seconds();
4e81bb83
MN
1978 npols ++;
1979 }
1980 }
1981#endif
1982
1da177e4
LT
1983 if (pol->action == XFRM_POLICY_ALLOW) {
1984 struct sec_path *sp;
1985 static struct sec_path dummy;
4e81bb83 1986 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
41a49cc3 1987 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
4e81bb83
MN
1988 struct xfrm_tmpl **tpp = tp;
1989 int ti = 0;
1da177e4
LT
1990 int i, k;
1991
1992 if ((sp = skb->sp) == NULL)
1993 sp = &dummy;
1994
4e81bb83
MN
1995 for (pi = 0; pi < npols; pi++) {
1996 if (pols[pi] != pol &&
0aa64774
MN
1997 pols[pi]->action != XFRM_POLICY_ALLOW) {
1998 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK);
4e81bb83 1999 goto reject;
0aa64774
MN
2000 }
2001 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2002 XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR);
4e81bb83 2003 goto reject_error;
0aa64774 2004 }
4e81bb83
MN
2005 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2006 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2007 }
2008 xfrm_nr = ti;
41a49cc3
MN
2009 if (npols > 1) {
2010 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2011 tpp = stp;
2012 }
4e81bb83 2013
1da177e4
LT
2014 /* For each tunnel xfrm, find the first matching tmpl.
2015 * For each tmpl before that, find corresponding xfrm.
2016 * Order is _important_. Later we will implement
2017 * some barriers, but at the moment barriers
2018 * are implied between each two transformations.
2019 */
4e81bb83
MN
2020 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2021 k = xfrm_policy_ok(tpp[i], sp, k, family);
df0ba92a 2022 if (k < 0) {
d1d9facf
JM
2023 if (k < -1)
2024 /* "-2 - errored_index" returned */
2025 xerr_idx = -(2+k);
0aa64774 2026 XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2027 goto reject;
df0ba92a 2028 }
1da177e4
LT
2029 }
2030
0aa64774
MN
2031 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2032 XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH);
1da177e4 2033 goto reject;
0aa64774 2034 }
1da177e4 2035
4e81bb83 2036 xfrm_pols_put(pols, npols);
1da177e4
LT
2037 return 1;
2038 }
0aa64774 2039 XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK);
1da177e4
LT
2040
2041reject:
df0ba92a 2042 xfrm_secpath_reject(xerr_idx, skb, &fl);
4e81bb83
MN
2043reject_error:
2044 xfrm_pols_put(pols, npols);
1da177e4
LT
2045 return 0;
2046}
2047EXPORT_SYMBOL(__xfrm_policy_check);
2048
2049int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2050{
2051 struct flowi fl;
2052
0aa64774
MN
2053 if (xfrm_decode_session(skb, &fl, family) < 0) {
2054 /* XXX: we should have something like FWDHDRERROR here. */
2055 XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR);
1da177e4 2056 return 0;
0aa64774 2057 }
1da177e4
LT
2058
2059 return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
2060}
2061EXPORT_SYMBOL(__xfrm_route_forward);
2062
d49c73c7
DM
2063/* Optimize later using cookies and generation ids. */
2064
1da177e4
LT
2065static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2066{
d49c73c7
DM
2067 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2068 * to "-1" to force all XFRM destinations to get validated by
2069 * dst_ops->check on every use. We do this because when a
2070 * normal route referenced by an XFRM dst is obsoleted we do
2071 * not go looking around for all parent referencing XFRM dsts
2072 * so that we can invalidate them. It is just too much work.
2073 * Instead we make the checks here on every use. For example:
2074 *
2075 * XFRM dst A --> IPv4 dst X
2076 *
2077 * X is the "xdst->route" of A (X is also the "dst->path" of A
2078 * in this example). If X is marked obsolete, "A" will not
2079 * notice. That's what we are validating here via the
2080 * stale_bundle() check.
2081 *
2082 * When a policy's bundle is pruned, we dst_free() the XFRM
2083 * dst which causes it's ->obsolete field to be set to a
2084 * positive non-zero integer. If an XFRM dst has been pruned
2085 * like this, we want to force a new route lookup.
399c180a 2086 */
d49c73c7
DM
2087 if (dst->obsolete < 0 && !stale_bundle(dst))
2088 return dst;
2089
1da177e4
LT
2090 return NULL;
2091}
2092
2093static int stale_bundle(struct dst_entry *dst)
2094{
5b368e61 2095 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
1da177e4
LT
2096}
2097
aabc9761 2098void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
1da177e4 2099{
1da177e4 2100 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
c346dca1 2101 dst->dev = dev_net(dev)->loopback_dev;
de3cb747 2102 dev_hold(dst->dev);
1da177e4
LT
2103 dev_put(dev);
2104 }
2105}
aabc9761 2106EXPORT_SYMBOL(xfrm_dst_ifdown);
1da177e4
LT
2107
2108static void xfrm_link_failure(struct sk_buff *skb)
2109{
2110 /* Impossible. Such dst must be popped before reaches point of failure. */
2111 return;
2112}
2113
2114static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2115{
2116 if (dst) {
2117 if (dst->obsolete) {
2118 dst_release(dst);
2119 dst = NULL;
2120 }
2121 }
2122 return dst;
2123}
2124
2518c7c2
DM
2125static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p)
2126{
2127 struct dst_entry *dst, **dstp;
2128
2129 write_lock(&pol->lock);
2130 dstp = &pol->bundles;
2131 while ((dst=*dstp) != NULL) {
2132 if (func(dst)) {
2133 *dstp = dst->next;
2134 dst->next = *gc_list_p;
2135 *gc_list_p = dst;
2136 } else {
2137 dstp = &dst->next;
2138 }
2139 }
2140 write_unlock(&pol->lock);
2141}
2142
1da177e4
LT
2143static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
2144{
2518c7c2
DM
2145 struct dst_entry *gc_list = NULL;
2146 int dir;
1da177e4
LT
2147
2148 read_lock_bh(&xfrm_policy_lock);
2518c7c2
DM
2149 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2150 struct xfrm_policy *pol;
2151 struct hlist_node *entry;
2152 struct hlist_head *table;
2153 int i;
4e81bb83 2154
2518c7c2
DM
2155 hlist_for_each_entry(pol, entry,
2156 &xfrm_policy_inexact[dir], bydst)
2157 prune_one_bundle(pol, func, &gc_list);
2158
2159 table = xfrm_policy_bydst[dir].table;
2160 for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
2161 hlist_for_each_entry(pol, entry, table + i, bydst)
2162 prune_one_bundle(pol, func, &gc_list);
1da177e4
LT
2163 }
2164 }
2165 read_unlock_bh(&xfrm_policy_lock);
2166
2167 while (gc_list) {
2518c7c2 2168 struct dst_entry *dst = gc_list;
1da177e4
LT
2169 gc_list = dst->next;
2170 dst_free(dst);
2171 }
2172}
2173
2174static int unused_bundle(struct dst_entry *dst)
2175{
2176 return !atomic_read(&dst->__refcnt);
2177}
2178
2179static void __xfrm_garbage_collect(void)
2180{
2181 xfrm_prune_bundles(unused_bundle);
2182}
2183
1c095399 2184static int xfrm_flush_bundles(void)
1da177e4
LT
2185{
2186 xfrm_prune_bundles(stale_bundle);
2187 return 0;
2188}
2189
25ee3286 2190static void xfrm_init_pmtu(struct dst_entry *dst)
1da177e4
LT
2191{
2192 do {
2193 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2194 u32 pmtu, route_mtu_cached;
2195
2196 pmtu = dst_mtu(dst->child);
2197 xdst->child_mtu_cached = pmtu;
2198
2199 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2200
2201 route_mtu_cached = dst_mtu(xdst->route);
2202 xdst->route_mtu_cached = route_mtu_cached;
2203
2204 if (pmtu > route_mtu_cached)
2205 pmtu = route_mtu_cached;
2206
2207 dst->metrics[RTAX_MTU-1] = pmtu;
2208 } while ((dst = dst->next));
2209}
2210
1da177e4
LT
2211/* Check that the bundle accepts the flow and its components are
2212 * still valid.
2213 */
2214
5b368e61
VY
2215int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
2216 struct flowi *fl, int family, int strict)
1da177e4
LT
2217{
2218 struct dst_entry *dst = &first->u.dst;
2219 struct xfrm_dst *last;
2220 u32 mtu;
2221
92d63dec 2222 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
1da177e4
LT
2223 (dst->dev && !netif_running(dst->dev)))
2224 return 0;
157bfc25
MN
2225#ifdef CONFIG_XFRM_SUB_POLICY
2226 if (fl) {
2227 if (first->origin && !flow_cache_uli_match(first->origin, fl))
2228 return 0;
2229 if (first->partner &&
2230 !xfrm_selector_match(first->partner, fl, family))
2231 return 0;
2232 }
2233#endif
1da177e4
LT
2234
2235 last = NULL;
2236
2237 do {
2238 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2239
2240 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
2241 return 0;
67f83cbf
VY
2242 if (fl && pol &&
2243 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
e0d1caa7 2244 return 0;
1da177e4
LT
2245 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2246 return 0;
9d4a706d
DM
2247 if (xdst->genid != dst->xfrm->genid)
2248 return 0;
e53820de 2249
1bfcb10f 2250 if (strict && fl &&
13996378 2251 !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
e53820de
MN
2252 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
2253 return 0;
1da177e4
LT
2254
2255 mtu = dst_mtu(dst->child);
2256 if (xdst->child_mtu_cached != mtu) {
2257 last = xdst;
2258 xdst->child_mtu_cached = mtu;
2259 }
2260
92d63dec 2261 if (!dst_check(xdst->route, xdst->route_cookie))
1da177e4
LT
2262 return 0;
2263 mtu = dst_mtu(xdst->route);
2264 if (xdst->route_mtu_cached != mtu) {
2265 last = xdst;
2266 xdst->route_mtu_cached = mtu;
2267 }
2268
2269 dst = dst->child;
2270 } while (dst->xfrm);
2271
2272 if (likely(!last))
2273 return 1;
2274
2275 mtu = last->child_mtu_cached;
2276 for (;;) {
2277 dst = &last->u.dst;
2278
2279 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2280 if (mtu > last->route_mtu_cached)
2281 mtu = last->route_mtu_cached;
2282 dst->metrics[RTAX_MTU-1] = mtu;
2283
2284 if (last == first)
2285 break;
2286
bd0bf076 2287 last = (struct xfrm_dst *)last->u.dst.next;
1da177e4
LT
2288 last->child_mtu_cached = mtu;
2289 }
2290
2291 return 1;
2292}
2293
2294EXPORT_SYMBOL(xfrm_bundle_ok);
2295
1da177e4
LT
2296int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2297{
2298 int err = 0;
2299 if (unlikely(afinfo == NULL))
2300 return -EINVAL;
2301 if (unlikely(afinfo->family >= NPROTO))
2302 return -EAFNOSUPPORT;
e959d812 2303 write_lock_bh(&xfrm_policy_afinfo_lock);
1da177e4
LT
2304 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2305 err = -ENOBUFS;
2306 else {
2307 struct dst_ops *dst_ops = afinfo->dst_ops;
2308 if (likely(dst_ops->kmem_cachep == NULL))
2309 dst_ops->kmem_cachep = xfrm_dst_cache;
2310 if (likely(dst_ops->check == NULL))
2311 dst_ops->check = xfrm_dst_check;
1da177e4
LT
2312 if (likely(dst_ops->negative_advice == NULL))
2313 dst_ops->negative_advice = xfrm_negative_advice;
2314 if (likely(dst_ops->link_failure == NULL))
2315 dst_ops->link_failure = xfrm_link_failure;
1da177e4
LT
2316 if (likely(afinfo->garbage_collect == NULL))
2317 afinfo->garbage_collect = __xfrm_garbage_collect;
2318 xfrm_policy_afinfo[afinfo->family] = afinfo;
2319 }
e959d812 2320 write_unlock_bh(&xfrm_policy_afinfo_lock);
1da177e4
LT
2321 return err;
2322}
2323EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2324
2325int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2326{
2327 int err = 0;
2328 if (unlikely(afinfo == NULL))
2329 return -EINVAL;
2330 if (unlikely(afinfo->family >= NPROTO))
2331 return -EAFNOSUPPORT;
e959d812 2332 write_lock_bh(&xfrm_policy_afinfo_lock);
1da177e4
LT
2333 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2334 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2335 err = -EINVAL;
2336 else {
2337 struct dst_ops *dst_ops = afinfo->dst_ops;
2338 xfrm_policy_afinfo[afinfo->family] = NULL;
2339 dst_ops->kmem_cachep = NULL;
2340 dst_ops->check = NULL;
1da177e4
LT
2341 dst_ops->negative_advice = NULL;
2342 dst_ops->link_failure = NULL;
1da177e4
LT
2343 afinfo->garbage_collect = NULL;
2344 }
2345 }
e959d812 2346 write_unlock_bh(&xfrm_policy_afinfo_lock);
1da177e4
LT
2347 return err;
2348}
2349EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2350
2351static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2352{
2353 struct xfrm_policy_afinfo *afinfo;
2354 if (unlikely(family >= NPROTO))
2355 return NULL;
2356 read_lock(&xfrm_policy_afinfo_lock);
2357 afinfo = xfrm_policy_afinfo[family];
546be240
HX
2358 if (unlikely(!afinfo))
2359 read_unlock(&xfrm_policy_afinfo_lock);
1da177e4
LT
2360 return afinfo;
2361}
2362
2363static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2364{
546be240
HX
2365 read_unlock(&xfrm_policy_afinfo_lock);
2366}
2367
1da177e4
LT
2368static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2369{
e9dc8653
EB
2370 struct net_device *dev = ptr;
2371
721499e8 2372 if (!net_eq(dev_net(dev), &init_net))
e9dc8653
EB
2373 return NOTIFY_DONE;
2374
1da177e4
LT
2375 switch (event) {
2376 case NETDEV_DOWN:
2377 xfrm_flush_bundles();
2378 }
2379 return NOTIFY_DONE;
2380}
2381
2382static struct notifier_block xfrm_dev_notifier = {
d5917a35 2383 .notifier_call = xfrm_dev_event,
1da177e4
LT
2384};
2385
558f82ef
MN
2386#ifdef CONFIG_XFRM_STATISTICS
2387static int __init xfrm_statistics_init(void)
2388{
2389 if (snmp_mib_init((void **)xfrm_statistics,
2390 sizeof(struct linux_xfrm_mib)) < 0)
2391 return -ENOMEM;
2392 return 0;
2393}
2394#endif
2395
d62ddc21 2396static int __net_init xfrm_policy_init(struct net *net)
1da177e4 2397{
2518c7c2
DM
2398 unsigned int hmask, sz;
2399 int dir;
2400
d62ddc21
AD
2401 if (net_eq(net, &init_net))
2402 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
1da177e4 2403 sizeof(struct xfrm_dst),
e5d679f3 2404 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
20c2df83 2405 NULL);
1da177e4 2406
2518c7c2
DM
2407 hmask = 8 - 1;
2408 sz = (hmask+1) * sizeof(struct hlist_head);
2409
93b851c1
AD
2410 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2411 if (!net->xfrm.policy_byidx)
2412 goto out_byidx;
2518c7c2 2413 xfrm_idx_hmask = hmask;
2518c7c2
DM
2414
2415 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2416 struct xfrm_policy_hash *htab;
2417
2418 INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]);
2419
2420 htab = &xfrm_policy_bydst[dir];
44e36b42 2421 htab->table = xfrm_hash_alloc(sz);
2518c7c2
DM
2422 htab->hmask = hmask;
2423 if (!htab->table)
2424 panic("XFRM: failed to allocate bydst hash\n");
2425 }
2426
adfcf0b2 2427 INIT_LIST_HEAD(&net->xfrm.policy_all);
d62ddc21
AD
2428 if (net_eq(net, &init_net))
2429 register_netdevice_notifier(&xfrm_dev_notifier);
2430 return 0;
93b851c1
AD
2431
2432out_byidx:
2433 return -ENOMEM;
d62ddc21
AD
2434}
2435
2436static void xfrm_policy_fini(struct net *net)
2437{
93b851c1
AD
2438 unsigned int sz;
2439
adfcf0b2 2440 WARN_ON(!list_empty(&net->xfrm.policy_all));
93b851c1
AD
2441
2442 sz = (xfrm_idx_hmask + 1) * sizeof(struct hlist_head);
2443 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2444 xfrm_hash_free(net->xfrm.policy_byidx, sz);
1da177e4
LT
2445}
2446
d62ddc21
AD
2447static int __net_init xfrm_net_init(struct net *net)
2448{
2449 int rv;
2450
2451 rv = xfrm_state_init(net);
2452 if (rv < 0)
2453 goto out_state;
2454 rv = xfrm_policy_init(net);
2455 if (rv < 0)
2456 goto out_policy;
2457 return 0;
2458
2459out_policy:
2460 xfrm_state_fini(net);
2461out_state:
2462 return rv;
2463}
2464
2465static void __net_exit xfrm_net_exit(struct net *net)
2466{
2467 xfrm_policy_fini(net);
2468 xfrm_state_fini(net);
2469}
2470
2471static struct pernet_operations __net_initdata xfrm_net_ops = {
2472 .init = xfrm_net_init,
2473 .exit = xfrm_net_exit,
2474};
2475
1da177e4
LT
2476void __init xfrm_init(void)
2477{
d62ddc21 2478 register_pernet_subsys(&xfrm_net_ops);
558f82ef
MN
2479#ifdef CONFIG_XFRM_STATISTICS
2480 xfrm_statistics_init();
2481#endif
1da177e4 2482 xfrm_input_init();
558f82ef
MN
2483#ifdef CONFIG_XFRM_STATISTICS
2484 xfrm_proc_init();
2485#endif
1da177e4
LT
2486}
2487
ab5f5e8b 2488#ifdef CONFIG_AUDITSYSCALL
1486cbd7
IJ
2489static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2490 struct audit_buffer *audit_buf)
ab5f5e8b 2491{
875179fa
PM
2492 struct xfrm_sec_ctx *ctx = xp->security;
2493 struct xfrm_selector *sel = &xp->selector;
2494
2495 if (ctx)
ab5f5e8b 2496 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
875179fa 2497 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
ab5f5e8b 2498
875179fa 2499 switch(sel->family) {
ab5f5e8b 2500 case AF_INET:
21454aaa 2501 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
875179fa
PM
2502 if (sel->prefixlen_s != 32)
2503 audit_log_format(audit_buf, " src_prefixlen=%d",
2504 sel->prefixlen_s);
21454aaa 2505 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
875179fa
PM
2506 if (sel->prefixlen_d != 32)
2507 audit_log_format(audit_buf, " dst_prefixlen=%d",
2508 sel->prefixlen_d);
ab5f5e8b
JL
2509 break;
2510 case AF_INET6:
5b095d98 2511 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
875179fa
PM
2512 if (sel->prefixlen_s != 128)
2513 audit_log_format(audit_buf, " src_prefixlen=%d",
2514 sel->prefixlen_s);
5b095d98 2515 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
875179fa
PM
2516 if (sel->prefixlen_d != 128)
2517 audit_log_format(audit_buf, " dst_prefixlen=%d",
2518 sel->prefixlen_d);
ab5f5e8b
JL
2519 break;
2520 }
2521}
2522
68277acc 2523void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
2532386f 2524 uid_t auid, u32 sessionid, u32 secid)
ab5f5e8b
JL
2525{
2526 struct audit_buffer *audit_buf;
ab5f5e8b 2527
afeb14b4 2528 audit_buf = xfrm_audit_start("SPD-add");
ab5f5e8b
JL
2529 if (audit_buf == NULL)
2530 return;
2532386f 2531 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
afeb14b4 2532 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL
2533 xfrm_audit_common_policyinfo(xp, audit_buf);
2534 audit_log_end(audit_buf);
2535}
2536EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2537
68277acc 2538void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2532386f 2539 uid_t auid, u32 sessionid, u32 secid)
ab5f5e8b
JL
2540{
2541 struct audit_buffer *audit_buf;
ab5f5e8b 2542
afeb14b4 2543 audit_buf = xfrm_audit_start("SPD-delete");
ab5f5e8b
JL
2544 if (audit_buf == NULL)
2545 return;
2532386f 2546 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
afeb14b4 2547 audit_log_format(audit_buf, " res=%u", result);
ab5f5e8b
JL
2548 xfrm_audit_common_policyinfo(xp, audit_buf);
2549 audit_log_end(audit_buf);
2550}
2551EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2552#endif
2553
80c9abaa
SS
2554#ifdef CONFIG_XFRM_MIGRATE
2555static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2556 struct xfrm_selector *sel_tgt)
2557{
2558 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2559 if (sel_tgt->family == sel_cmp->family &&
2560 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
a716c119 2561 sel_cmp->family) == 0 &&
80c9abaa
SS
2562 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2563 sel_cmp->family) == 0 &&
2564 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2565 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2566 return 1;
2567 }
2568 } else {
2569 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2570 return 1;
2571 }
2572 }
2573 return 0;
2574}
2575
2576static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2577 u8 dir, u8 type)
2578{
2579 struct xfrm_policy *pol, *ret = NULL;
2580 struct hlist_node *entry;
2581 struct hlist_head *chain;
2582 u32 priority = ~0U;
2583
2584 read_lock_bh(&xfrm_policy_lock);
2585 chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir);
2586 hlist_for_each_entry(pol, entry, chain, bydst) {
2587 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2588 pol->type == type) {
2589 ret = pol;
2590 priority = ret->priority;
2591 break;
2592 }
2593 }
2594 chain = &xfrm_policy_inexact[dir];
2595 hlist_for_each_entry(pol, entry, chain, bydst) {
2596 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2597 pol->type == type &&
2598 pol->priority < priority) {
2599 ret = pol;
2600 break;
2601 }
2602 }
2603
2604 if (ret)
2605 xfrm_pol_hold(ret);
2606
2607 read_unlock_bh(&xfrm_policy_lock);
2608
2609 return ret;
2610}
2611
2612static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2613{
2614 int match = 0;
2615
2616 if (t->mode == m->mode && t->id.proto == m->proto &&
2617 (m->reqid == 0 || t->reqid == m->reqid)) {
2618 switch (t->mode) {
2619 case XFRM_MODE_TUNNEL:
2620 case XFRM_MODE_BEET:
2621 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2622 m->old_family) == 0 &&
2623 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2624 m->old_family) == 0) {
2625 match = 1;
2626 }
2627 break;
2628 case XFRM_MODE_TRANSPORT:
2629 /* in case of transport mode, template does not store
2630 any IP addresses, hence we just compare mode and
2631 protocol */
2632 match = 1;
2633 break;
2634 default:
2635 break;
2636 }
2637 }
2638 return match;
2639}
2640
2641/* update endpoint address(es) of template(s) */
2642static int xfrm_policy_migrate(struct xfrm_policy *pol,
2643 struct xfrm_migrate *m, int num_migrate)
2644{
2645 struct xfrm_migrate *mp;
2646 struct dst_entry *dst;
2647 int i, j, n = 0;
2648
2649 write_lock_bh(&pol->lock);
12a169e7 2650 if (unlikely(pol->walk.dead)) {
80c9abaa
SS
2651 /* target policy has been deleted */
2652 write_unlock_bh(&pol->lock);
2653 return -ENOENT;
2654 }
2655
2656 for (i = 0; i < pol->xfrm_nr; i++) {
2657 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2658 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2659 continue;
2660 n++;
1bfcb10f
HX
2661 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2662 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
80c9abaa
SS
2663 continue;
2664 /* update endpoints */
2665 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2666 sizeof(pol->xfrm_vec[i].id.daddr));
2667 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2668 sizeof(pol->xfrm_vec[i].saddr));
2669 pol->xfrm_vec[i].encap_family = mp->new_family;
2670 /* flush bundles */
2671 while ((dst = pol->bundles) != NULL) {
2672 pol->bundles = dst->next;
2673 dst_free(dst);
2674 }
2675 }
2676 }
2677
2678 write_unlock_bh(&pol->lock);
2679
2680 if (!n)
2681 return -ENODATA;
2682
2683 return 0;
2684}
2685
2686static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2687{
2688 int i, j;
2689
2690 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2691 return -EINVAL;
2692
2693 for (i = 0; i < num_migrate; i++) {
2694 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2695 m[i].old_family) == 0) &&
2696 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2697 m[i].old_family) == 0))
2698 return -EINVAL;
2699 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2700 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2701 return -EINVAL;
2702
2703 /* check if there is any duplicated entry */
2704 for (j = i + 1; j < num_migrate; j++) {
2705 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2706 sizeof(m[i].old_daddr)) &&
2707 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2708 sizeof(m[i].old_saddr)) &&
2709 m[i].proto == m[j].proto &&
2710 m[i].mode == m[j].mode &&
2711 m[i].reqid == m[j].reqid &&
2712 m[i].old_family == m[j].old_family)
2713 return -EINVAL;
2714 }
2715 }
2716
2717 return 0;
2718}
2719
2720int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
13c1d189
AE
2721 struct xfrm_migrate *m, int num_migrate,
2722 struct xfrm_kmaddress *k)
80c9abaa
SS
2723{
2724 int i, err, nx_cur = 0, nx_new = 0;
2725 struct xfrm_policy *pol = NULL;
2726 struct xfrm_state *x, *xc;
2727 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2728 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2729 struct xfrm_migrate *mp;
2730
2731 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2732 goto out;
2733
2734 /* Stage 1 - find policy */
2735 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2736 err = -ENOENT;
2737 goto out;
2738 }
2739
2740 /* Stage 2 - find and update state(s) */
2741 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2742 if ((x = xfrm_migrate_state_find(mp))) {
2743 x_cur[nx_cur] = x;
2744 nx_cur++;
2745 if ((xc = xfrm_state_migrate(x, mp))) {
2746 x_new[nx_new] = xc;
2747 nx_new++;
2748 } else {
2749 err = -ENODATA;
2750 goto restore_state;
2751 }
2752 }
2753 }
2754
2755 /* Stage 3 - update policy */
2756 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2757 goto restore_state;
2758
2759 /* Stage 4 - delete old state(s) */
2760 if (nx_cur) {
2761 xfrm_states_put(x_cur, nx_cur);
2762 xfrm_states_delete(x_cur, nx_cur);
2763 }
2764
2765 /* Stage 5 - announce */
13c1d189 2766 km_migrate(sel, dir, type, m, num_migrate, k);
80c9abaa
SS
2767
2768 xfrm_pol_put(pol);
2769
2770 return 0;
2771out:
2772 return err;
2773
2774restore_state:
2775 if (pol)
2776 xfrm_pol_put(pol);
2777 if (nx_cur)
2778 xfrm_states_put(x_cur, nx_cur);
2779 if (nx_new)
2780 xfrm_states_delete(x_new, nx_new);
2781
2782 return err;
2783}
e610e679 2784EXPORT_SYMBOL(xfrm_migrate);
80c9abaa 2785#endif