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x86, printk: Get rid of <0> from stack output
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / xfrm / xfrm_policy.c
blobcbab6e1a8c9c4043fcfdba5bdc17c5e9d5dea45c
1 /*
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
13 *
14 */
15
16 #include <linux/err.h>
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>
24 #include <linux/netfilter.h>
25 #include <linux/module.h>
26 #include <linux/cache.h>
27 #include <linux/audit.h>
28 #include <net/dst.h>
29 #include <net/xfrm.h>
30 #include <net/ip.h>
31 #ifdef CONFIG_XFRM_STATISTICS
32 #include <net/snmp.h>
33 #endif
34
35 #include "xfrm_hash.h"
36
37 DEFINE_MUTEX(xfrm_cfg_mutex);
38 EXPORT_SYMBOL(xfrm_cfg_mutex);
39
40 static DEFINE_SPINLOCK(xfrm_policy_sk_bundle_lock);
41 static struct dst_entry *xfrm_policy_sk_bundles;
42 static DEFINE_RWLOCK(xfrm_policy_lock);
43
44 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
45 static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
46
47 static struct kmem_cache *xfrm_dst_cache __read_mostly;
48
49 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
50 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
51 static void xfrm_init_pmtu(struct dst_entry *dst);
52 static int stale_bundle(struct dst_entry *dst);
53
54 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
55 int dir);
56
57 static inline int
58 __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
59 {
60 return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
61 addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
62 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
63 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
64 (fl->proto == sel->proto || !sel->proto) &&
65 (fl->oif == sel->ifindex || !sel->ifindex);
66 }
67
68 static inline int
69 __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
70 {
71 return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
72 addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
73 !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
74 !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
75 (fl->proto == sel->proto || !sel->proto) &&
76 (fl->oif == sel->ifindex || !sel->ifindex);
77 }
78
79 int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
80 unsigned short family)
81 {
82 switch (family) {
83 case AF_INET:
84 return __xfrm4_selector_match(sel, fl);
85 case AF_INET6:
86 return __xfrm6_selector_match(sel, fl);
87 }
88 return 0;
89 }
90
91 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
92 xfrm_address_t *saddr,
93 xfrm_address_t *daddr,
94 int family)
95 {
96 struct xfrm_policy_afinfo *afinfo;
97 struct dst_entry *dst;
98
99 afinfo = xfrm_policy_get_afinfo(family);
100 if (unlikely(afinfo == NULL))
101 return ERR_PTR(-EAFNOSUPPORT);
102
103 dst = afinfo->dst_lookup(net, tos, saddr, daddr);
104
105 xfrm_policy_put_afinfo(afinfo);
106
107 return dst;
108 }
109
110 static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
111 xfrm_address_t *prev_saddr,
112 xfrm_address_t *prev_daddr,
113 int family)
114 {
115 struct net *net = xs_net(x);
116 xfrm_address_t *saddr = &x->props.saddr;
117 xfrm_address_t *daddr = &x->id.daddr;
118 struct dst_entry *dst;
119
120 if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
121 saddr = x->coaddr;
122 daddr = prev_daddr;
123 }
124 if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
125 saddr = prev_saddr;
126 daddr = x->coaddr;
127 }
128
129 dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family);
130
131 if (!IS_ERR(dst)) {
132 if (prev_saddr != saddr)
133 memcpy(prev_saddr, saddr, sizeof(*prev_saddr));
134 if (prev_daddr != daddr)
135 memcpy(prev_daddr, daddr, sizeof(*prev_daddr));
136 }
137
138 return dst;
139 }
140
141 static inline unsigned long make_jiffies(long secs)
142 {
143 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
144 return MAX_SCHEDULE_TIMEOUT-1;
145 else
146 return secs*HZ;
147 }
148
149 static void xfrm_policy_timer(unsigned long data)
150 {
151 struct xfrm_policy *xp = (struct xfrm_policy*)data;
152 unsigned long now = get_seconds();
153 long next = LONG_MAX;
154 int warn = 0;
155 int dir;
156
157 read_lock(&xp->lock);
158
159 if (unlikely(xp->walk.dead))
160 goto out;
161
162 dir = xfrm_policy_id2dir(xp->index);
163
164 if (xp->lft.hard_add_expires_seconds) {
165 long tmo = xp->lft.hard_add_expires_seconds +
166 xp->curlft.add_time - now;
167 if (tmo <= 0)
168 goto expired;
169 if (tmo < next)
170 next = tmo;
171 }
172 if (xp->lft.hard_use_expires_seconds) {
173 long tmo = xp->lft.hard_use_expires_seconds +
174 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
175 if (tmo <= 0)
176 goto expired;
177 if (tmo < next)
178 next = tmo;
179 }
180 if (xp->lft.soft_add_expires_seconds) {
181 long tmo = xp->lft.soft_add_expires_seconds +
182 xp->curlft.add_time - now;
183 if (tmo <= 0) {
184 warn = 1;
185 tmo = XFRM_KM_TIMEOUT;
186 }
187 if (tmo < next)
188 next = tmo;
189 }
190 if (xp->lft.soft_use_expires_seconds) {
191 long tmo = xp->lft.soft_use_expires_seconds +
192 (xp->curlft.use_time ? : xp->curlft.add_time) - now;
193 if (tmo <= 0) {
194 warn = 1;
195 tmo = XFRM_KM_TIMEOUT;
196 }
197 if (tmo < next)
198 next = tmo;
199 }
200
201 if (warn)
202 km_policy_expired(xp, dir, 0, 0);
203 if (next != LONG_MAX &&
204 !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
205 xfrm_pol_hold(xp);
206
207 out:
208 read_unlock(&xp->lock);
209 xfrm_pol_put(xp);
210 return;
211
212 expired:
213 read_unlock(&xp->lock);
214 if (!xfrm_policy_delete(xp, dir))
215 km_policy_expired(xp, dir, 1, 0);
216 xfrm_pol_put(xp);
217 }
218
219 static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo)
220 {
221 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
222
223 if (unlikely(pol->walk.dead))
224 flo = NULL;
225 else
226 xfrm_pol_hold(pol);
227
228 return flo;
229 }
230
231 static int xfrm_policy_flo_check(struct flow_cache_object *flo)
232 {
233 struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo);
234
235 return !pol->walk.dead;
236 }
237
238 static void xfrm_policy_flo_delete(struct flow_cache_object *flo)
239 {
240 xfrm_pol_put(container_of(flo, struct xfrm_policy, flo));
241 }
242
243 static const struct flow_cache_ops xfrm_policy_fc_ops = {
244 .get = xfrm_policy_flo_get,
245 .check = xfrm_policy_flo_check,
246 .delete = xfrm_policy_flo_delete,
247 };
248
249 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
250 * SPD calls.
251 */
252
253 struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
254 {
255 struct xfrm_policy *policy;
256
257 policy = kzalloc(sizeof(struct xfrm_policy), gfp);
258
259 if (policy) {
260 write_pnet(&policy->xp_net, net);
261 INIT_LIST_HEAD(&policy->walk.all);
262 INIT_HLIST_NODE(&policy->bydst);
263 INIT_HLIST_NODE(&policy->byidx);
264 rwlock_init(&policy->lock);
265 atomic_set(&policy->refcnt, 1);
266 setup_timer(&policy->timer, xfrm_policy_timer,
267 (unsigned long)policy);
268 policy->flo.ops = &xfrm_policy_fc_ops;
269 }
270 return policy;
271 }
272 EXPORT_SYMBOL(xfrm_policy_alloc);
273
274 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
275
276 void xfrm_policy_destroy(struct xfrm_policy *policy)
277 {
278 BUG_ON(!policy->walk.dead);
279
280 if (del_timer(&policy->timer))
281 BUG();
282
283 security_xfrm_policy_free(policy->security);
284 kfree(policy);
285 }
286 EXPORT_SYMBOL(xfrm_policy_destroy);
287
288 /* Rule must be locked. Release descentant resources, announce
289 * entry dead. The rule must be unlinked from lists to the moment.
290 */
291
292 static void xfrm_policy_kill(struct xfrm_policy *policy)
293 {
294 policy->walk.dead = 1;
295
296 atomic_inc(&policy->genid);
297
298 if (del_timer(&policy->timer))
299 xfrm_pol_put(policy);
300
301 xfrm_pol_put(policy);
302 }
303
304 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
305
306 static inline unsigned int idx_hash(struct net *net, u32 index)
307 {
308 return __idx_hash(index, net->xfrm.policy_idx_hmask);
309 }
310
311 static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir)
312 {
313 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
314 unsigned int hash = __sel_hash(sel, family, hmask);
315
316 return (hash == hmask + 1 ?
317 &net->xfrm.policy_inexact[dir] :
318 net->xfrm.policy_bydst[dir].table + hash);
319 }
320
321 static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
322 {
323 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
324 unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
325
326 return net->xfrm.policy_bydst[dir].table + hash;
327 }
328
329 static void xfrm_dst_hash_transfer(struct hlist_head *list,
330 struct hlist_head *ndsttable,
331 unsigned int nhashmask)
332 {
333 struct hlist_node *entry, *tmp, *entry0 = NULL;
334 struct xfrm_policy *pol;
335 unsigned int h0 = 0;
336
337 redo:
338 hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
339 unsigned int h;
340
341 h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
342 pol->family, nhashmask);
343 if (!entry0) {
344 hlist_del(entry);
345 hlist_add_head(&pol->bydst, ndsttable+h);
346 h0 = h;
347 } else {
348 if (h != h0)
349 continue;
350 hlist_del(entry);
351 hlist_add_after(entry0, &pol->bydst);
352 }
353 entry0 = entry;
354 }
355 if (!hlist_empty(list)) {
356 entry0 = NULL;
357 goto redo;
358 }
359 }
360
361 static void xfrm_idx_hash_transfer(struct hlist_head *list,
362 struct hlist_head *nidxtable,
363 unsigned int nhashmask)
364 {
365 struct hlist_node *entry, *tmp;
366 struct xfrm_policy *pol;
367
368 hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
369 unsigned int h;
370
371 h = __idx_hash(pol->index, nhashmask);
372 hlist_add_head(&pol->byidx, nidxtable+h);
373 }
374 }
375
376 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
377 {
378 return ((old_hmask + 1) << 1) - 1;
379 }
380
381 static void xfrm_bydst_resize(struct net *net, int dir)
382 {
383 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
384 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
385 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
386 struct hlist_head *odst = net->xfrm.policy_bydst[dir].table;
387 struct hlist_head *ndst = xfrm_hash_alloc(nsize);
388 int i;
389
390 if (!ndst)
391 return;
392
393 write_lock_bh(&xfrm_policy_lock);
394
395 for (i = hmask; i >= 0; i--)
396 xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
397
398 net->xfrm.policy_bydst[dir].table = ndst;
399 net->xfrm.policy_bydst[dir].hmask = nhashmask;
400
401 write_unlock_bh(&xfrm_policy_lock);
402
403 xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
404 }
405
406 static void xfrm_byidx_resize(struct net *net, int total)
407 {
408 unsigned int hmask = net->xfrm.policy_idx_hmask;
409 unsigned int nhashmask = xfrm_new_hash_mask(hmask);
410 unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
411 struct hlist_head *oidx = net->xfrm.policy_byidx;
412 struct hlist_head *nidx = xfrm_hash_alloc(nsize);
413 int i;
414
415 if (!nidx)
416 return;
417
418 write_lock_bh(&xfrm_policy_lock);
419
420 for (i = hmask; i >= 0; i--)
421 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
422
423 net->xfrm.policy_byidx = nidx;
424 net->xfrm.policy_idx_hmask = nhashmask;
425
426 write_unlock_bh(&xfrm_policy_lock);
427
428 xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
429 }
430
431 static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total)
432 {
433 unsigned int cnt = net->xfrm.policy_count[dir];
434 unsigned int hmask = net->xfrm.policy_bydst[dir].hmask;
435
436 if (total)
437 *total += cnt;
438
439 if ((hmask + 1) < xfrm_policy_hashmax &&
440 cnt > hmask)
441 return 1;
442
443 return 0;
444 }
445
446 static inline int xfrm_byidx_should_resize(struct net *net, int total)
447 {
448 unsigned int hmask = net->xfrm.policy_idx_hmask;
449
450 if ((hmask + 1) < xfrm_policy_hashmax &&
451 total > hmask)
452 return 1;
453
454 return 0;
455 }
456
457 void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si)
458 {
459 read_lock_bh(&xfrm_policy_lock);
460 si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN];
461 si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT];
462 si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD];
463 si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
464 si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
465 si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
466 si->spdhcnt = net->xfrm.policy_idx_hmask;
467 si->spdhmcnt = xfrm_policy_hashmax;
468 read_unlock_bh(&xfrm_policy_lock);
469 }
470 EXPORT_SYMBOL(xfrm_spd_getinfo);
471
472 static DEFINE_MUTEX(hash_resize_mutex);
473 static void xfrm_hash_resize(struct work_struct *work)
474 {
475 struct net *net = container_of(work, struct net, xfrm.policy_hash_work);
476 int dir, total;
477
478 mutex_lock(&hash_resize_mutex);
479
480 total = 0;
481 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
482 if (xfrm_bydst_should_resize(net, dir, &total))
483 xfrm_bydst_resize(net, dir);
484 }
485 if (xfrm_byidx_should_resize(net, total))
486 xfrm_byidx_resize(net, total);
487
488 mutex_unlock(&hash_resize_mutex);
489 }
490
491 /* Generate new index... KAME seems to generate them ordered by cost
492 * of an absolute inpredictability of ordering of rules. This will not pass. */
493 static u32 xfrm_gen_index(struct net *net, int dir)
494 {
495 static u32 idx_generator;
496
497 for (;;) {
498 struct hlist_node *entry;
499 struct hlist_head *list;
500 struct xfrm_policy *p;
501 u32 idx;
502 int found;
503
504 idx = (idx_generator | dir);
505 idx_generator += 8;
506 if (idx == 0)
507 idx = 8;
508 list = net->xfrm.policy_byidx + idx_hash(net, idx);
509 found = 0;
510 hlist_for_each_entry(p, entry, list, byidx) {
511 if (p->index == idx) {
512 found = 1;
513 break;
514 }
515 }
516 if (!found)
517 return idx;
518 }
519 }
520
521 static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
522 {
523 u32 *p1 = (u32 *) s1;
524 u32 *p2 = (u32 *) s2;
525 int len = sizeof(struct xfrm_selector) / sizeof(u32);
526 int i;
527
528 for (i = 0; i < len; i++) {
529 if (p1[i] != p2[i])
530 return 1;
531 }
532
533 return 0;
534 }
535
536 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
537 {
538 struct net *net = xp_net(policy);
539 struct xfrm_policy *pol;
540 struct xfrm_policy *delpol;
541 struct hlist_head *chain;
542 struct hlist_node *entry, *newpos;
543 u32 mark = policy->mark.v & policy->mark.m;
544
545 write_lock_bh(&xfrm_policy_lock);
546 chain = policy_hash_bysel(net, &policy->selector, policy->family, dir);
547 delpol = NULL;
548 newpos = NULL;
549 hlist_for_each_entry(pol, entry, chain, bydst) {
550 if (pol->type == policy->type &&
551 !selector_cmp(&pol->selector, &policy->selector) &&
552 (mark & pol->mark.m) == pol->mark.v &&
553 xfrm_sec_ctx_match(pol->security, policy->security) &&
554 !WARN_ON(delpol)) {
555 if (excl) {
556 write_unlock_bh(&xfrm_policy_lock);
557 return -EEXIST;
558 }
559 delpol = pol;
560 if (policy->priority > pol->priority)
561 continue;
562 } else if (policy->priority >= pol->priority) {
563 newpos = &pol->bydst;
564 continue;
565 }
566 if (delpol)
567 break;
568 }
569 if (newpos)
570 hlist_add_after(newpos, &policy->bydst);
571 else
572 hlist_add_head(&policy->bydst, chain);
573 xfrm_pol_hold(policy);
574 net->xfrm.policy_count[dir]++;
575 atomic_inc(&flow_cache_genid);
576 if (delpol)
577 __xfrm_policy_unlink(delpol, dir);
578 policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir);
579 hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
580 policy->curlft.add_time = get_seconds();
581 policy->curlft.use_time = 0;
582 if (!mod_timer(&policy->timer, jiffies + HZ))
583 xfrm_pol_hold(policy);
584 list_add(&policy->walk.all, &net->xfrm.policy_all);
585 write_unlock_bh(&xfrm_policy_lock);
586
587 if (delpol)
588 xfrm_policy_kill(delpol);
589 else if (xfrm_bydst_should_resize(net, dir, NULL))
590 schedule_work(&net->xfrm.policy_hash_work);
591
592 return 0;
593 }
594 EXPORT_SYMBOL(xfrm_policy_insert);
595
596 struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type,
597 int dir, struct xfrm_selector *sel,
598 struct xfrm_sec_ctx *ctx, int delete,
599 int *err)
600 {
601 struct xfrm_policy *pol, *ret;
602 struct hlist_head *chain;
603 struct hlist_node *entry;
604
605 *err = 0;
606 write_lock_bh(&xfrm_policy_lock);
607 chain = policy_hash_bysel(net, sel, sel->family, dir);
608 ret = NULL;
609 hlist_for_each_entry(pol, entry, chain, bydst) {
610 if (pol->type == type &&
611 (mark & pol->mark.m) == pol->mark.v &&
612 !selector_cmp(sel, &pol->selector) &&
613 xfrm_sec_ctx_match(ctx, pol->security)) {
614 xfrm_pol_hold(pol);
615 if (delete) {
616 *err = security_xfrm_policy_delete(
617 pol->security);
618 if (*err) {
619 write_unlock_bh(&xfrm_policy_lock);
620 return pol;
621 }
622 __xfrm_policy_unlink(pol, dir);
623 }
624 ret = pol;
625 break;
626 }
627 }
628 write_unlock_bh(&xfrm_policy_lock);
629
630 if (ret && delete)
631 xfrm_policy_kill(ret);
632 return ret;
633 }
634 EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
635
636 struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type,
637 int dir, u32 id, int delete, int *err)
638 {
639 struct xfrm_policy *pol, *ret;
640 struct hlist_head *chain;
641 struct hlist_node *entry;
642
643 *err = -ENOENT;
644 if (xfrm_policy_id2dir(id) != dir)
645 return NULL;
646
647 *err = 0;
648 write_lock_bh(&xfrm_policy_lock);
649 chain = net->xfrm.policy_byidx + idx_hash(net, id);
650 ret = NULL;
651 hlist_for_each_entry(pol, entry, chain, byidx) {
652 if (pol->type == type && pol->index == id &&
653 (mark & pol->mark.m) == pol->mark.v) {
654 xfrm_pol_hold(pol);
655 if (delete) {
656 *err = security_xfrm_policy_delete(
657 pol->security);
658 if (*err) {
659 write_unlock_bh(&xfrm_policy_lock);
660 return pol;
661 }
662 __xfrm_policy_unlink(pol, dir);
663 }
664 ret = pol;
665 break;
666 }
667 }
668 write_unlock_bh(&xfrm_policy_lock);
669
670 if (ret && delete)
671 xfrm_policy_kill(ret);
672 return ret;
673 }
674 EXPORT_SYMBOL(xfrm_policy_byid);
675
676 #ifdef CONFIG_SECURITY_NETWORK_XFRM
677 static inline int
678 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
679 {
680 int dir, err = 0;
681
682 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
683 struct xfrm_policy *pol;
684 struct hlist_node *entry;
685 int i;
686
687 hlist_for_each_entry(pol, entry,
688 &net->xfrm.policy_inexact[dir], bydst) {
689 if (pol->type != type)
690 continue;
691 err = security_xfrm_policy_delete(pol->security);
692 if (err) {
693 xfrm_audit_policy_delete(pol, 0,
694 audit_info->loginuid,
695 audit_info->sessionid,
696 audit_info->secid);
697 return err;
698 }
699 }
700 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
701 hlist_for_each_entry(pol, entry,
702 net->xfrm.policy_bydst[dir].table + i,
703 bydst) {
704 if (pol->type != type)
705 continue;
706 err = security_xfrm_policy_delete(
707 pol->security);
708 if (err) {
709 xfrm_audit_policy_delete(pol, 0,
710 audit_info->loginuid,
711 audit_info->sessionid,
712 audit_info->secid);
713 return err;
714 }
715 }
716 }
717 }
718 return err;
719 }
720 #else
721 static inline int
722 xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info)
723 {
724 return 0;
725 }
726 #endif
727
728 int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info)
729 {
730 int dir, err = 0, cnt = 0;
731
732 write_lock_bh(&xfrm_policy_lock);
733
734 err = xfrm_policy_flush_secctx_check(net, type, audit_info);
735 if (err)
736 goto out;
737
738 for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
739 struct xfrm_policy *pol;
740 struct hlist_node *entry;
741 int i;
742
743 again1:
744 hlist_for_each_entry(pol, entry,
745 &net->xfrm.policy_inexact[dir], bydst) {
746 if (pol->type != type)
747 continue;
748 __xfrm_policy_unlink(pol, dir);
749 write_unlock_bh(&xfrm_policy_lock);
750 cnt++;
751
752 xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
753 audit_info->sessionid,
754 audit_info->secid);
755
756 xfrm_policy_kill(pol);
757
758 write_lock_bh(&xfrm_policy_lock);
759 goto again1;
760 }
761
762 for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) {
763 again2:
764 hlist_for_each_entry(pol, entry,
765 net->xfrm.policy_bydst[dir].table + i,
766 bydst) {
767 if (pol->type != type)
768 continue;
769 __xfrm_policy_unlink(pol, dir);
770 write_unlock_bh(&xfrm_policy_lock);
771 cnt++;
772
773 xfrm_audit_policy_delete(pol, 1,
774 audit_info->loginuid,
775 audit_info->sessionid,
776 audit_info->secid);
777 xfrm_policy_kill(pol);
778
779 write_lock_bh(&xfrm_policy_lock);
780 goto again2;
781 }
782 }
783
784 }
785 if (!cnt)
786 err = -ESRCH;
787 out:
788 write_unlock_bh(&xfrm_policy_lock);
789 return err;
790 }
791 EXPORT_SYMBOL(xfrm_policy_flush);
792
793 int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
794 int (*func)(struct xfrm_policy *, int, int, void*),
795 void *data)
796 {
797 struct xfrm_policy *pol;
798 struct xfrm_policy_walk_entry *x;
799 int error = 0;
800
801 if (walk->type >= XFRM_POLICY_TYPE_MAX &&
802 walk->type != XFRM_POLICY_TYPE_ANY)
803 return -EINVAL;
804
805 if (list_empty(&walk->walk.all) && walk->seq != 0)
806 return 0;
807
808 write_lock_bh(&xfrm_policy_lock);
809 if (list_empty(&walk->walk.all))
810 x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
811 else
812 x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
813 list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
814 if (x->dead)
815 continue;
816 pol = container_of(x, struct xfrm_policy, walk);
817 if (walk->type != XFRM_POLICY_TYPE_ANY &&
818 walk->type != pol->type)
819 continue;
820 error = func(pol, xfrm_policy_id2dir(pol->index),
821 walk->seq, data);
822 if (error) {
823 list_move_tail(&walk->walk.all, &x->all);
824 goto out;
825 }
826 walk->seq++;
827 }
828 if (walk->seq == 0) {
829 error = -ENOENT;
830 goto out;
831 }
832 list_del_init(&walk->walk.all);
833 out:
834 write_unlock_bh(&xfrm_policy_lock);
835 return error;
836 }
837 EXPORT_SYMBOL(xfrm_policy_walk);
838
839 void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
840 {
841 INIT_LIST_HEAD(&walk->walk.all);
842 walk->walk.dead = 1;
843 walk->type = type;
844 walk->seq = 0;
845 }
846 EXPORT_SYMBOL(xfrm_policy_walk_init);
847
848 void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
849 {
850 if (list_empty(&walk->walk.all))
851 return;
852
853 write_lock_bh(&xfrm_policy_lock);
854 list_del(&walk->walk.all);
855 write_unlock_bh(&xfrm_policy_lock);
856 }
857 EXPORT_SYMBOL(xfrm_policy_walk_done);
858
859 /*
860 * Find policy to apply to this flow.
861 *
862 * Returns 0 if policy found, else an -errno.
863 */
864 static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
865 u8 type, u16 family, int dir)
866 {
867 struct xfrm_selector *sel = &pol->selector;
868 int match, ret = -ESRCH;
869
870 if (pol->family != family ||
871 (fl->mark & pol->mark.m) != pol->mark.v ||
872 pol->type != type)
873 return ret;
874
875 match = xfrm_selector_match(sel, fl, family);
876 if (match)
877 ret = security_xfrm_policy_lookup(pol->security, fl->secid,
878 dir);
879
880 return ret;
881 }
882
883 static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
884 struct flowi *fl,
885 u16 family, u8 dir)
886 {
887 int err;
888 struct xfrm_policy *pol, *ret;
889 xfrm_address_t *daddr, *saddr;
890 struct hlist_node *entry;
891 struct hlist_head *chain;
892 u32 priority = ~0U;
893
894 daddr = xfrm_flowi_daddr(fl, family);
895 saddr = xfrm_flowi_saddr(fl, family);
896 if (unlikely(!daddr || !saddr))
897 return NULL;
898
899 read_lock_bh(&xfrm_policy_lock);
900 chain = policy_hash_direct(net, daddr, saddr, family, dir);
901 ret = NULL;
902 hlist_for_each_entry(pol, entry, chain, bydst) {
903 err = xfrm_policy_match(pol, fl, type, family, dir);
904 if (err) {
905 if (err == -ESRCH)
906 continue;
907 else {
908 ret = ERR_PTR(err);
909 goto fail;
910 }
911 } else {
912 ret = pol;
913 priority = ret->priority;
914 break;
915 }
916 }
917 chain = &net->xfrm.policy_inexact[dir];
918 hlist_for_each_entry(pol, entry, chain, bydst) {
919 err = xfrm_policy_match(pol, fl, type, family, dir);
920 if (err) {
921 if (err == -ESRCH)
922 continue;
923 else {
924 ret = ERR_PTR(err);
925 goto fail;
926 }
927 } else if (pol->priority < priority) {
928 ret = pol;
929 break;
930 }
931 }
932 if (ret)
933 xfrm_pol_hold(ret);
934 fail:
935 read_unlock_bh(&xfrm_policy_lock);
936
937 return ret;
938 }
939
940 static struct xfrm_policy *
941 __xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir)
942 {
943 #ifdef CONFIG_XFRM_SUB_POLICY
944 struct xfrm_policy *pol;
945
946 pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir);
947 if (pol != NULL)
948 return pol;
949 #endif
950 return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir);
951 }
952
953 static struct flow_cache_object *
954 xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family,
955 u8 dir, struct flow_cache_object *old_obj, void *ctx)
956 {
957 struct xfrm_policy *pol;
958
959 if (old_obj)
960 xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo));
961
962 pol = __xfrm_policy_lookup(net, fl, family, dir);
963 if (IS_ERR_OR_NULL(pol))
964 return ERR_CAST(pol);
965
966 /* Resolver returns two references:
967 * one for cache and one for caller of flow_cache_lookup() */
968 xfrm_pol_hold(pol);
969
970 return &pol->flo;
971 }
972
973 static inline int policy_to_flow_dir(int dir)
974 {
975 if (XFRM_POLICY_IN == FLOW_DIR_IN &&
976 XFRM_POLICY_OUT == FLOW_DIR_OUT &&
977 XFRM_POLICY_FWD == FLOW_DIR_FWD)
978 return dir;
979 switch (dir) {
980 default:
981 case XFRM_POLICY_IN:
982 return FLOW_DIR_IN;
983 case XFRM_POLICY_OUT:
984 return FLOW_DIR_OUT;
985 case XFRM_POLICY_FWD:
986 return FLOW_DIR_FWD;
987 }
988 }
989
990 static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
991 {
992 struct xfrm_policy *pol;
993
994 read_lock_bh(&xfrm_policy_lock);
995 if ((pol = sk->sk_policy[dir]) != NULL) {
996 int match = xfrm_selector_match(&pol->selector, fl,
997 sk->sk_family);
998 int err = 0;
999
1000 if (match) {
1001 if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
1002 pol = NULL;
1003 goto out;
1004 }
1005 err = security_xfrm_policy_lookup(pol->security,
1006 fl->secid,
1007 policy_to_flow_dir(dir));
1008 if (!err)
1009 xfrm_pol_hold(pol);
1010 else if (err == -ESRCH)
1011 pol = NULL;
1012 else
1013 pol = ERR_PTR(err);
1014 } else
1015 pol = NULL;
1016 }
1017 out:
1018 read_unlock_bh(&xfrm_policy_lock);
1019 return pol;
1020 }
1021
1022 static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
1023 {
1024 struct net *net = xp_net(pol);
1025 struct hlist_head *chain = policy_hash_bysel(net, &pol->selector,
1026 pol->family, dir);
1027
1028 list_add(&pol->walk.all, &net->xfrm.policy_all);
1029 hlist_add_head(&pol->bydst, chain);
1030 hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index));
1031 net->xfrm.policy_count[dir]++;
1032 xfrm_pol_hold(pol);
1033
1034 if (xfrm_bydst_should_resize(net, dir, NULL))
1035 schedule_work(&net->xfrm.policy_hash_work);
1036 }
1037
1038 static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
1039 int dir)
1040 {
1041 struct net *net = xp_net(pol);
1042
1043 if (hlist_unhashed(&pol->bydst))
1044 return NULL;
1045
1046 hlist_del(&pol->bydst);
1047 hlist_del(&pol->byidx);
1048 list_del(&pol->walk.all);
1049 net->xfrm.policy_count[dir]--;
1050
1051 return pol;
1052 }
1053
1054 int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
1055 {
1056 write_lock_bh(&xfrm_policy_lock);
1057 pol = __xfrm_policy_unlink(pol, dir);
1058 write_unlock_bh(&xfrm_policy_lock);
1059 if (pol) {
1060 xfrm_policy_kill(pol);
1061 return 0;
1062 }
1063 return -ENOENT;
1064 }
1065 EXPORT_SYMBOL(xfrm_policy_delete);
1066
1067 int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
1068 {
1069 struct net *net = xp_net(pol);
1070 struct xfrm_policy *old_pol;
1071
1072 #ifdef CONFIG_XFRM_SUB_POLICY
1073 if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
1074 return -EINVAL;
1075 #endif
1076
1077 write_lock_bh(&xfrm_policy_lock);
1078 old_pol = sk->sk_policy[dir];
1079 sk->sk_policy[dir] = pol;
1080 if (pol) {
1081 pol->curlft.add_time = get_seconds();
1082 pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir);
1083 __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
1084 }
1085 if (old_pol)
1086 /* Unlinking succeeds always. This is the only function
1087 * allowed to delete or replace socket policy.
1088 */
1089 __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
1090 write_unlock_bh(&xfrm_policy_lock);
1091
1092 if (old_pol) {
1093 xfrm_policy_kill(old_pol);
1094 }
1095 return 0;
1096 }
1097
1098 static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
1099 {
1100 struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC);
1101
1102 if (newp) {
1103 newp->selector = old->selector;
1104 if (security_xfrm_policy_clone(old->security,
1105 &newp->security)) {
1106 kfree(newp);
1107 return NULL; /* ENOMEM */
1108 }
1109 newp->lft = old->lft;
1110 newp->curlft = old->curlft;
1111 newp->mark = old->mark;
1112 newp->action = old->action;
1113 newp->flags = old->flags;
1114 newp->xfrm_nr = old->xfrm_nr;
1115 newp->index = old->index;
1116 newp->type = old->type;
1117 memcpy(newp->xfrm_vec, old->xfrm_vec,
1118 newp->xfrm_nr*sizeof(struct xfrm_tmpl));
1119 write_lock_bh(&xfrm_policy_lock);
1120 __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
1121 write_unlock_bh(&xfrm_policy_lock);
1122 xfrm_pol_put(newp);
1123 }
1124 return newp;
1125 }
1126
1127 int __xfrm_sk_clone_policy(struct sock *sk)
1128 {
1129 struct xfrm_policy *p0 = sk->sk_policy[0],
1130 *p1 = sk->sk_policy[1];
1131
1132 sk->sk_policy[0] = sk->sk_policy[1] = NULL;
1133 if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
1134 return -ENOMEM;
1135 if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
1136 return -ENOMEM;
1137 return 0;
1138 }
1139
1140 static int
1141 xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote,
1142 unsigned short family)
1143 {
1144 int err;
1145 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1146
1147 if (unlikely(afinfo == NULL))
1148 return -EINVAL;
1149 err = afinfo->get_saddr(net, local, remote);
1150 xfrm_policy_put_afinfo(afinfo);
1151 return err;
1152 }
1153
1154 /* Resolve list of templates for the flow, given policy. */
1155
1156 static int
1157 xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
1158 struct xfrm_state **xfrm,
1159 unsigned short family)
1160 {
1161 struct net *net = xp_net(policy);
1162 int nx;
1163 int i, error;
1164 xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
1165 xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
1166 xfrm_address_t tmp;
1167
1168 for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
1169 struct xfrm_state *x;
1170 xfrm_address_t *remote = daddr;
1171 xfrm_address_t *local = saddr;
1172 struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
1173
1174 if (tmpl->mode == XFRM_MODE_TUNNEL ||
1175 tmpl->mode == XFRM_MODE_BEET) {
1176 remote = &tmpl->id.daddr;
1177 local = &tmpl->saddr;
1178 if (xfrm_addr_any(local, tmpl->encap_family)) {
1179 error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family);
1180 if (error)
1181 goto fail;
1182 local = &tmp;
1183 }
1184 }
1185
1186 x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
1187
1188 if (x && x->km.state == XFRM_STATE_VALID) {
1189 xfrm[nx++] = x;
1190 daddr = remote;
1191 saddr = local;
1192 continue;
1193 }
1194 if (x) {
1195 error = (x->km.state == XFRM_STATE_ERROR ?
1196 -EINVAL : -EAGAIN);
1197 xfrm_state_put(x);
1198 }
1199 else if (error == -ESRCH)
1200 error = -EAGAIN;
1201
1202 if (!tmpl->optional)
1203 goto fail;
1204 }
1205 return nx;
1206
1207 fail:
1208 for (nx--; nx>=0; nx--)
1209 xfrm_state_put(xfrm[nx]);
1210 return error;
1211 }
1212
1213 static int
1214 xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
1215 struct xfrm_state **xfrm,
1216 unsigned short family)
1217 {
1218 struct xfrm_state *tp[XFRM_MAX_DEPTH];
1219 struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
1220 int cnx = 0;
1221 int error;
1222 int ret;
1223 int i;
1224
1225 for (i = 0; i < npols; i++) {
1226 if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
1227 error = -ENOBUFS;
1228 goto fail;
1229 }
1230
1231 ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
1232 if (ret < 0) {
1233 error = ret;
1234 goto fail;
1235 } else
1236 cnx += ret;
1237 }
1238
1239 /* found states are sorted for outbound processing */
1240 if (npols > 1)
1241 xfrm_state_sort(xfrm, tpp, cnx, family);
1242
1243 return cnx;
1244
1245 fail:
1246 for (cnx--; cnx>=0; cnx--)
1247 xfrm_state_put(tpp[cnx]);
1248 return error;
1249
1250 }
1251
1252 /* Check that the bundle accepts the flow and its components are
1253 * still valid.
1254 */
1255
1256 static inline int xfrm_get_tos(struct flowi *fl, int family)
1257 {
1258 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1259 int tos;
1260
1261 if (!afinfo)
1262 return -EINVAL;
1263
1264 tos = afinfo->get_tos(fl);
1265
1266 xfrm_policy_put_afinfo(afinfo);
1267
1268 return tos;
1269 }
1270
1271 static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo)
1272 {
1273 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1274 struct dst_entry *dst = &xdst->u.dst;
1275
1276 if (xdst->route == NULL) {
1277 /* Dummy bundle - if it has xfrms we were not
1278 * able to build bundle as template resolution failed.
1279 * It means we need to try again resolving. */
1280 if (xdst->num_xfrms > 0)
1281 return NULL;
1282 } else {
1283 /* Real bundle */
1284 if (stale_bundle(dst))
1285 return NULL;
1286 }
1287
1288 dst_hold(dst);
1289 return flo;
1290 }
1291
1292 static int xfrm_bundle_flo_check(struct flow_cache_object *flo)
1293 {
1294 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1295 struct dst_entry *dst = &xdst->u.dst;
1296
1297 if (!xdst->route)
1298 return 0;
1299 if (stale_bundle(dst))
1300 return 0;
1301
1302 return 1;
1303 }
1304
1305 static void xfrm_bundle_flo_delete(struct flow_cache_object *flo)
1306 {
1307 struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo);
1308 struct dst_entry *dst = &xdst->u.dst;
1309
1310 dst_free(dst);
1311 }
1312
1313 static const struct flow_cache_ops xfrm_bundle_fc_ops = {
1314 .get = xfrm_bundle_flo_get,
1315 .check = xfrm_bundle_flo_check,
1316 .delete = xfrm_bundle_flo_delete,
1317 };
1318
1319 static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family)
1320 {
1321 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1322 struct dst_ops *dst_ops;
1323 struct xfrm_dst *xdst;
1324
1325 if (!afinfo)
1326 return ERR_PTR(-EINVAL);
1327
1328 switch (family) {
1329 case AF_INET:
1330 dst_ops = &net->xfrm.xfrm4_dst_ops;
1331 break;
1332 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1333 case AF_INET6:
1334 dst_ops = &net->xfrm.xfrm6_dst_ops;
1335 break;
1336 #endif
1337 default:
1338 BUG();
1339 }
1340 xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS);
1341 xfrm_policy_put_afinfo(afinfo);
1342
1343 xdst->flo.ops = &xfrm_bundle_fc_ops;
1344
1345 return xdst;
1346 }
1347
1348 static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
1349 int nfheader_len)
1350 {
1351 struct xfrm_policy_afinfo *afinfo =
1352 xfrm_policy_get_afinfo(dst->ops->family);
1353 int err;
1354
1355 if (!afinfo)
1356 return -EINVAL;
1357
1358 err = afinfo->init_path(path, dst, nfheader_len);
1359
1360 xfrm_policy_put_afinfo(afinfo);
1361
1362 return err;
1363 }
1364
1365 static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
1366 struct flowi *fl)
1367 {
1368 struct xfrm_policy_afinfo *afinfo =
1369 xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
1370 int err;
1371
1372 if (!afinfo)
1373 return -EINVAL;
1374
1375 err = afinfo->fill_dst(xdst, dev, fl);
1376
1377 xfrm_policy_put_afinfo(afinfo);
1378
1379 return err;
1380 }
1381
1382
1383 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1384 * all the metrics... Shortly, bundle a bundle.
1385 */
1386
1387 static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
1388 struct xfrm_state **xfrm, int nx,
1389 struct flowi *fl,
1390 struct dst_entry *dst)
1391 {
1392 struct net *net = xp_net(policy);
1393 unsigned long now = jiffies;
1394 struct net_device *dev;
1395 struct dst_entry *dst_prev = NULL;
1396 struct dst_entry *dst0 = NULL;
1397 int i = 0;
1398 int err;
1399 int header_len = 0;
1400 int nfheader_len = 0;
1401 int trailer_len = 0;
1402 int tos;
1403 int family = policy->selector.family;
1404 xfrm_address_t saddr, daddr;
1405
1406 xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
1407
1408 tos = xfrm_get_tos(fl, family);
1409 err = tos;
1410 if (tos < 0)
1411 goto put_states;
1412
1413 dst_hold(dst);
1414
1415 for (; i < nx; i++) {
1416 struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
1417 struct dst_entry *dst1 = &xdst->u.dst;
1418
1419 err = PTR_ERR(xdst);
1420 if (IS_ERR(xdst)) {
1421 dst_release(dst);
1422 goto put_states;
1423 }
1424
1425 if (!dst_prev)
1426 dst0 = dst1;
1427 else {
1428 dst_prev->child = dst_clone(dst1);
1429 dst1->flags |= DST_NOHASH;
1430 }
1431
1432 xdst->route = dst;
1433 memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics));
1434
1435 if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
1436 family = xfrm[i]->props.family;
1437 dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
1438 family);
1439 err = PTR_ERR(dst);
1440 if (IS_ERR(dst))
1441 goto put_states;
1442 } else
1443 dst_hold(dst);
1444
1445 dst1->xfrm = xfrm[i];
1446 xdst->xfrm_genid = xfrm[i]->genid;
1447
1448 dst1->obsolete = -1;
1449 dst1->flags |= DST_HOST;
1450 dst1->lastuse = now;
1451
1452 dst1->input = dst_discard;
1453 dst1->output = xfrm[i]->outer_mode->afinfo->output;
1454
1455 dst1->next = dst_prev;
1456 dst_prev = dst1;
1457
1458 header_len += xfrm[i]->props.header_len;
1459 if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
1460 nfheader_len += xfrm[i]->props.header_len;
1461 trailer_len += xfrm[i]->props.trailer_len;
1462 }
1463
1464 dst_prev->child = dst;
1465 dst0->path = dst;
1466
1467 err = -ENODEV;
1468 dev = dst->dev;
1469 if (!dev)
1470 goto free_dst;
1471
1472 /* Copy neighbour for reachability confirmation */
1473 dst0->neighbour = neigh_clone(dst->neighbour);
1474
1475 xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
1476 xfrm_init_pmtu(dst_prev);
1477
1478 for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
1479 struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
1480
1481 err = xfrm_fill_dst(xdst, dev, fl);
1482 if (err)
1483 goto free_dst;
1484
1485 dst_prev->header_len = header_len;
1486 dst_prev->trailer_len = trailer_len;
1487 header_len -= xdst->u.dst.xfrm->props.header_len;
1488 trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
1489 }
1490
1491 out:
1492 return dst0;
1493
1494 put_states:
1495 for (; i < nx; i++)
1496 xfrm_state_put(xfrm[i]);
1497 free_dst:
1498 if (dst0)
1499 dst_free(dst0);
1500 dst0 = ERR_PTR(err);
1501 goto out;
1502 }
1503
1504 static int inline
1505 xfrm_dst_alloc_copy(void **target, void *src, int size)
1506 {
1507 if (!*target) {
1508 *target = kmalloc(size, GFP_ATOMIC);
1509 if (!*target)
1510 return -ENOMEM;
1511 }
1512 memcpy(*target, src, size);
1513 return 0;
1514 }
1515
1516 static int inline
1517 xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
1518 {
1519 #ifdef CONFIG_XFRM_SUB_POLICY
1520 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1521 return xfrm_dst_alloc_copy((void **)&(xdst->partner),
1522 sel, sizeof(*sel));
1523 #else
1524 return 0;
1525 #endif
1526 }
1527
1528 static int inline
1529 xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
1530 {
1531 #ifdef CONFIG_XFRM_SUB_POLICY
1532 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
1533 return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
1534 #else
1535 return 0;
1536 #endif
1537 }
1538
1539 static int xfrm_expand_policies(struct flowi *fl, u16 family,
1540 struct xfrm_policy **pols,
1541 int *num_pols, int *num_xfrms)
1542 {
1543 int i;
1544
1545 if (*num_pols == 0 || !pols[0]) {
1546 *num_pols = 0;
1547 *num_xfrms = 0;
1548 return 0;
1549 }
1550 if (IS_ERR(pols[0]))
1551 return PTR_ERR(pols[0]);
1552
1553 *num_xfrms = pols[0]->xfrm_nr;
1554
1555 #ifdef CONFIG_XFRM_SUB_POLICY
1556 if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW &&
1557 pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
1558 pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]),
1559 XFRM_POLICY_TYPE_MAIN,
1560 fl, family,
1561 XFRM_POLICY_OUT);
1562 if (pols[1]) {
1563 if (IS_ERR(pols[1])) {
1564 xfrm_pols_put(pols, *num_pols);
1565 return PTR_ERR(pols[1]);
1566 }
1567 (*num_pols) ++;
1568 (*num_xfrms) += pols[1]->xfrm_nr;
1569 }
1570 }
1571 #endif
1572 for (i = 0; i < *num_pols; i++) {
1573 if (pols[i]->action != XFRM_POLICY_ALLOW) {
1574 *num_xfrms = -1;
1575 break;
1576 }
1577 }
1578
1579 return 0;
1580
1581 }
1582
1583 static struct xfrm_dst *
1584 xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
1585 struct flowi *fl, u16 family,
1586 struct dst_entry *dst_orig)
1587 {
1588 struct net *net = xp_net(pols[0]);
1589 struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
1590 struct dst_entry *dst;
1591 struct xfrm_dst *xdst;
1592 int err;
1593
1594 /* Try to instantiate a bundle */
1595 err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
1596 if (err <= 0) {
1597 if (err != 0 && err != -EAGAIN)
1598 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1599 return ERR_PTR(err);
1600 }
1601
1602 dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig);
1603 if (IS_ERR(dst)) {
1604 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR);
1605 return ERR_CAST(dst);
1606 }
1607
1608 xdst = (struct xfrm_dst *)dst;
1609 xdst->num_xfrms = err;
1610 if (num_pols > 1)
1611 err = xfrm_dst_update_parent(dst, &pols[1]->selector);
1612 else
1613 err = xfrm_dst_update_origin(dst, fl);
1614 if (unlikely(err)) {
1615 dst_free(dst);
1616 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
1617 return ERR_PTR(err);
1618 }
1619
1620 xdst->num_pols = num_pols;
1621 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1622 xdst->policy_genid = atomic_read(&pols[0]->genid);
1623
1624 return xdst;
1625 }
1626
1627 static struct flow_cache_object *
1628 xfrm_bundle_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir,
1629 struct flow_cache_object *oldflo, void *ctx)
1630 {
1631 struct dst_entry *dst_orig = (struct dst_entry *)ctx;
1632 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1633 struct xfrm_dst *xdst, *new_xdst;
1634 int num_pols = 0, num_xfrms = 0, i, err, pol_dead;
1635
1636 /* Check if the policies from old bundle are usable */
1637 xdst = NULL;
1638 if (oldflo) {
1639 xdst = container_of(oldflo, struct xfrm_dst, flo);
1640 num_pols = xdst->num_pols;
1641 num_xfrms = xdst->num_xfrms;
1642 pol_dead = 0;
1643 for (i = 0; i < num_pols; i++) {
1644 pols[i] = xdst->pols[i];
1645 pol_dead |= pols[i]->walk.dead;
1646 }
1647 if (pol_dead) {
1648 dst_free(&xdst->u.dst);
1649 xdst = NULL;
1650 num_pols = 0;
1651 num_xfrms = 0;
1652 oldflo = NULL;
1653 }
1654 }
1655
1656 /* Resolve policies to use if we couldn't get them from
1657 * previous cache entry */
1658 if (xdst == NULL) {
1659 num_pols = 1;
1660 pols[0] = __xfrm_policy_lookup(net, fl, family, dir);
1661 err = xfrm_expand_policies(fl, family, pols,
1662 &num_pols, &num_xfrms);
1663 if (err < 0)
1664 goto inc_error;
1665 if (num_pols == 0)
1666 return NULL;
1667 if (num_xfrms <= 0)
1668 goto make_dummy_bundle;
1669 }
1670
1671 new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig);
1672 if (IS_ERR(new_xdst)) {
1673 err = PTR_ERR(new_xdst);
1674 if (err != -EAGAIN)
1675 goto error;
1676 if (oldflo == NULL)
1677 goto make_dummy_bundle;
1678 dst_hold(&xdst->u.dst);
1679 return oldflo;
1680 } else if (new_xdst == NULL) {
1681 num_xfrms = 0;
1682 if (oldflo == NULL)
1683 goto make_dummy_bundle;
1684 xdst->num_xfrms = 0;
1685 dst_hold(&xdst->u.dst);
1686 return oldflo;
1687 }
1688
1689 /* Kill the previous bundle */
1690 if (xdst) {
1691 /* The policies were stolen for newly generated bundle */
1692 xdst->num_pols = 0;
1693 dst_free(&xdst->u.dst);
1694 }
1695
1696 /* Flow cache does not have reference, it dst_free()'s,
1697 * but we do need to return one reference for original caller */
1698 dst_hold(&new_xdst->u.dst);
1699 return &new_xdst->flo;
1700
1701 make_dummy_bundle:
1702 /* We found policies, but there's no bundles to instantiate:
1703 * either because the policy blocks, has no transformations or
1704 * we could not build template (no xfrm_states).*/
1705 xdst = xfrm_alloc_dst(net, family);
1706 if (IS_ERR(xdst)) {
1707 xfrm_pols_put(pols, num_pols);
1708 return ERR_CAST(xdst);
1709 }
1710 xdst->num_pols = num_pols;
1711 xdst->num_xfrms = num_xfrms;
1712 memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols);
1713
1714 dst_hold(&xdst->u.dst);
1715 return &xdst->flo;
1716
1717 inc_error:
1718 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR);
1719 error:
1720 if (xdst != NULL)
1721 dst_free(&xdst->u.dst);
1722 else
1723 xfrm_pols_put(pols, num_pols);
1724 return ERR_PTR(err);
1725 }
1726
1727 /* Main function: finds/creates a bundle for given flow.
1728 *
1729 * At the moment we eat a raw IP route. Mostly to speed up lookups
1730 * on interfaces with disabled IPsec.
1731 */
1732 int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
1733 struct sock *sk, int flags)
1734 {
1735 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
1736 struct flow_cache_object *flo;
1737 struct xfrm_dst *xdst;
1738 struct dst_entry *dst, *dst_orig = *dst_p, *route;
1739 u16 family = dst_orig->ops->family;
1740 u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
1741 int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
1742
1743 restart:
1744 dst = NULL;
1745 xdst = NULL;
1746 route = NULL;
1747
1748 if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
1749 num_pols = 1;
1750 pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
1751 err = xfrm_expand_policies(fl, family, pols,
1752 &num_pols, &num_xfrms);
1753 if (err < 0)
1754 goto dropdst;
1755
1756 if (num_pols) {
1757 if (num_xfrms <= 0) {
1758 drop_pols = num_pols;
1759 goto no_transform;
1760 }
1761
1762 xdst = xfrm_resolve_and_create_bundle(
1763 pols, num_pols, fl,
1764 family, dst_orig);
1765 if (IS_ERR(xdst)) {
1766 xfrm_pols_put(pols, num_pols);
1767 err = PTR_ERR(xdst);
1768 goto dropdst;
1769 } else if (xdst == NULL) {
1770 num_xfrms = 0;
1771 drop_pols = num_pols;
1772 goto no_transform;
1773 }
1774
1775 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
1776 xdst->u.dst.next = xfrm_policy_sk_bundles;
1777 xfrm_policy_sk_bundles = &xdst->u.dst;
1778 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
1779
1780 route = xdst->route;
1781 }
1782 }
1783
1784 if (xdst == NULL) {
1785 /* To accelerate a bit... */
1786 if ((dst_orig->flags & DST_NOXFRM) ||
1787 !net->xfrm.policy_count[XFRM_POLICY_OUT])
1788 goto nopol;
1789
1790 flo = flow_cache_lookup(net, fl, family, dir,
1791 xfrm_bundle_lookup, dst_orig);
1792 if (flo == NULL)
1793 goto nopol;
1794 if (IS_ERR(flo)) {
1795 err = PTR_ERR(flo);
1796 goto dropdst;
1797 }
1798 xdst = container_of(flo, struct xfrm_dst, flo);
1799
1800 num_pols = xdst->num_pols;
1801 num_xfrms = xdst->num_xfrms;
1802 memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols);
1803 route = xdst->route;
1804 }
1805
1806 dst = &xdst->u.dst;
1807 if (route == NULL && num_xfrms > 0) {
1808 /* The only case when xfrm_bundle_lookup() returns a
1809 * bundle with null route, is when the template could
1810 * not be resolved. It means policies are there, but
1811 * bundle could not be created, since we don't yet
1812 * have the xfrm_state's. We need to wait for KM to
1813 * negotiate new SA's or bail out with error.*/
1814 if (net->xfrm.sysctl_larval_drop) {
1815 /* EREMOTE tells the caller to generate
1816 * a one-shot blackhole route. */
1817 dst_release(dst);
1818 xfrm_pols_put(pols, drop_pols);
1819 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1820 return -EREMOTE;
1821 }
1822 if (flags & XFRM_LOOKUP_WAIT) {
1823 DECLARE_WAITQUEUE(wait, current);
1824
1825 add_wait_queue(&net->xfrm.km_waitq, &wait);
1826 set_current_state(TASK_INTERRUPTIBLE);
1827 schedule();
1828 set_current_state(TASK_RUNNING);
1829 remove_wait_queue(&net->xfrm.km_waitq, &wait);
1830
1831 if (!signal_pending(current)) {
1832 dst_release(dst);
1833 goto restart;
1834 }
1835
1836 err = -ERESTART;
1837 } else
1838 err = -EAGAIN;
1839
1840 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
1841 goto error;
1842 }
1843
1844 no_transform:
1845 if (num_pols == 0)
1846 goto nopol;
1847
1848 if ((flags & XFRM_LOOKUP_ICMP) &&
1849 !(pols[0]->flags & XFRM_POLICY_ICMP)) {
1850 err = -ENOENT;
1851 goto error;
1852 }
1853
1854 for (i = 0; i < num_pols; i++)
1855 pols[i]->curlft.use_time = get_seconds();
1856
1857 if (num_xfrms < 0) {
1858 /* Prohibit the flow */
1859 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK);
1860 err = -EPERM;
1861 goto error;
1862 } else if (num_xfrms > 0) {
1863 /* Flow transformed */
1864 *dst_p = dst;
1865 dst_release(dst_orig);
1866 } else {
1867 /* Flow passes untransformed */
1868 dst_release(dst);
1869 }
1870 ok:
1871 xfrm_pols_put(pols, drop_pols);
1872 return 0;
1873
1874 nopol:
1875 if (!(flags & XFRM_LOOKUP_ICMP))
1876 goto ok;
1877 err = -ENOENT;
1878 error:
1879 dst_release(dst);
1880 dropdst:
1881 dst_release(dst_orig);
1882 *dst_p = NULL;
1883 xfrm_pols_put(pols, drop_pols);
1884 return err;
1885 }
1886 EXPORT_SYMBOL(__xfrm_lookup);
1887
1888 int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl,
1889 struct sock *sk, int flags)
1890 {
1891 int err = __xfrm_lookup(net, dst_p, fl, sk, flags);
1892
1893 if (err == -EREMOTE) {
1894 dst_release(*dst_p);
1895 *dst_p = NULL;
1896 err = -EAGAIN;
1897 }
1898
1899 return err;
1900 }
1901 EXPORT_SYMBOL(xfrm_lookup);
1902
1903 static inline int
1904 xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
1905 {
1906 struct xfrm_state *x;
1907
1908 if (!skb->sp || idx < 0 || idx >= skb->sp->len)
1909 return 0;
1910 x = skb->sp->xvec[idx];
1911 if (!x->type->reject)
1912 return 0;
1913 return x->type->reject(x, skb, fl);
1914 }
1915
1916 /* When skb is transformed back to its "native" form, we have to
1917 * check policy restrictions. At the moment we make this in maximally
1918 * stupid way. Shame on me. :-) Of course, connected sockets must
1919 * have policy cached at them.
1920 */
1921
1922 static inline int
1923 xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
1924 unsigned short family)
1925 {
1926 if (xfrm_state_kern(x))
1927 return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
1928 return x->id.proto == tmpl->id.proto &&
1929 (x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
1930 (x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
1931 x->props.mode == tmpl->mode &&
1932 (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
1933 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
1934 !(x->props.mode != XFRM_MODE_TRANSPORT &&
1935 xfrm_state_addr_cmp(tmpl, x, family));
1936 }
1937
1938 /*
1939 * 0 or more than 0 is returned when validation is succeeded (either bypass
1940 * because of optional transport mode, or next index of the mathced secpath
1941 * state with the template.
1942 * -1 is returned when no matching template is found.
1943 * Otherwise "-2 - errored_index" is returned.
1944 */
1945 static inline int
1946 xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
1947 unsigned short family)
1948 {
1949 int idx = start;
1950
1951 if (tmpl->optional) {
1952 if (tmpl->mode == XFRM_MODE_TRANSPORT)
1953 return start;
1954 } else
1955 start = -1;
1956 for (; idx < sp->len; idx++) {
1957 if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
1958 return ++idx;
1959 if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
1960 if (start == -1)
1961 start = -2-idx;
1962 break;
1963 }
1964 }
1965 return start;
1966 }
1967
1968 int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1969 unsigned int family, int reverse)
1970 {
1971 struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
1972 int err;
1973
1974 if (unlikely(afinfo == NULL))
1975 return -EAFNOSUPPORT;
1976
1977 afinfo->decode_session(skb, fl, reverse);
1978 err = security_xfrm_decode_session(skb, &fl->secid);
1979 xfrm_policy_put_afinfo(afinfo);
1980 return err;
1981 }
1982 EXPORT_SYMBOL(__xfrm_decode_session);
1983
1984 static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
1985 {
1986 for (; k < sp->len; k++) {
1987 if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
1988 *idxp = k;
1989 return 1;
1990 }
1991 }
1992
1993 return 0;
1994 }
1995
1996 int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
1997 unsigned short family)
1998 {
1999 struct net *net = dev_net(skb->dev);
2000 struct xfrm_policy *pol;
2001 struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
2002 int npols = 0;
2003 int xfrm_nr;
2004 int pi;
2005 int reverse;
2006 struct flowi fl;
2007 u8 fl_dir;
2008 int xerr_idx = -1;
2009
2010 reverse = dir & ~XFRM_POLICY_MASK;
2011 dir &= XFRM_POLICY_MASK;
2012 fl_dir = policy_to_flow_dir(dir);
2013
2014 if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
2015 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
2016 return 0;
2017 }
2018
2019 nf_nat_decode_session(skb, &fl, family);
2020
2021 /* First, check used SA against their selectors. */
2022 if (skb->sp) {
2023 int i;
2024
2025 for (i=skb->sp->len-1; i>=0; i--) {
2026 struct xfrm_state *x = skb->sp->xvec[i];
2027 if (!xfrm_selector_match(&x->sel, &fl, family)) {
2028 XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
2029 return 0;
2030 }
2031 }
2032 }
2033
2034 pol = NULL;
2035 if (sk && sk->sk_policy[dir]) {
2036 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
2037 if (IS_ERR(pol)) {
2038 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2039 return 0;
2040 }
2041 }
2042
2043 if (!pol) {
2044 struct flow_cache_object *flo;
2045
2046 flo = flow_cache_lookup(net, &fl, family, fl_dir,
2047 xfrm_policy_lookup, NULL);
2048 if (IS_ERR_OR_NULL(flo))
2049 pol = ERR_CAST(flo);
2050 else
2051 pol = container_of(flo, struct xfrm_policy, flo);
2052 }
2053
2054 if (IS_ERR(pol)) {
2055 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2056 return 0;
2057 }
2058
2059 if (!pol) {
2060 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
2061 xfrm_secpath_reject(xerr_idx, skb, &fl);
2062 XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS);
2063 return 0;
2064 }
2065 return 1;
2066 }
2067
2068 pol->curlft.use_time = get_seconds();
2069
2070 pols[0] = pol;
2071 npols ++;
2072 #ifdef CONFIG_XFRM_SUB_POLICY
2073 if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
2074 pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN,
2075 &fl, family,
2076 XFRM_POLICY_IN);
2077 if (pols[1]) {
2078 if (IS_ERR(pols[1])) {
2079 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
2080 return 0;
2081 }
2082 pols[1]->curlft.use_time = get_seconds();
2083 npols ++;
2084 }
2085 }
2086 #endif
2087
2088 if (pol->action == XFRM_POLICY_ALLOW) {
2089 struct sec_path *sp;
2090 static struct sec_path dummy;
2091 struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
2092 struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
2093 struct xfrm_tmpl **tpp = tp;
2094 int ti = 0;
2095 int i, k;
2096
2097 if ((sp = skb->sp) == NULL)
2098 sp = &dummy;
2099
2100 for (pi = 0; pi < npols; pi++) {
2101 if (pols[pi] != pol &&
2102 pols[pi]->action != XFRM_POLICY_ALLOW) {
2103 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2104 goto reject;
2105 }
2106 if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
2107 XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
2108 goto reject_error;
2109 }
2110 for (i = 0; i < pols[pi]->xfrm_nr; i++)
2111 tpp[ti++] = &pols[pi]->xfrm_vec[i];
2112 }
2113 xfrm_nr = ti;
2114 if (npols > 1) {
2115 xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
2116 tpp = stp;
2117 }
2118
2119 /* For each tunnel xfrm, find the first matching tmpl.
2120 * For each tmpl before that, find corresponding xfrm.
2121 * Order is _important_. Later we will implement
2122 * some barriers, but at the moment barriers
2123 * are implied between each two transformations.
2124 */
2125 for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
2126 k = xfrm_policy_ok(tpp[i], sp, k, family);
2127 if (k < 0) {
2128 if (k < -1)
2129 /* "-2 - errored_index" returned */
2130 xerr_idx = -(2+k);
2131 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2132 goto reject;
2133 }
2134 }
2135
2136 if (secpath_has_nontransport(sp, k, &xerr_idx)) {
2137 XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH);
2138 goto reject;
2139 }
2140
2141 xfrm_pols_put(pols, npols);
2142 return 1;
2143 }
2144 XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK);
2145
2146 reject:
2147 xfrm_secpath_reject(xerr_idx, skb, &fl);
2148 reject_error:
2149 xfrm_pols_put(pols, npols);
2150 return 0;
2151 }
2152 EXPORT_SYMBOL(__xfrm_policy_check);
2153
2154 int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
2155 {
2156 struct net *net = dev_net(skb->dev);
2157 struct flowi fl;
2158 struct dst_entry *dst;
2159 int res;
2160
2161 if (xfrm_decode_session(skb, &fl, family) < 0) {
2162 XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR);
2163 return 0;
2164 }
2165
2166 skb_dst_force(skb);
2167 dst = skb_dst(skb);
2168
2169 res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0;
2170 skb_dst_set(skb, dst);
2171 return res;
2172 }
2173 EXPORT_SYMBOL(__xfrm_route_forward);
2174
2175 /* Optimize later using cookies and generation ids. */
2176
2177 static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
2178 {
2179 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2180 * to "-1" to force all XFRM destinations to get validated by
2181 * dst_ops->check on every use. We do this because when a
2182 * normal route referenced by an XFRM dst is obsoleted we do
2183 * not go looking around for all parent referencing XFRM dsts
2184 * so that we can invalidate them. It is just too much work.
2185 * Instead we make the checks here on every use. For example:
2186 *
2187 * XFRM dst A --> IPv4 dst X
2188 *
2189 * X is the "xdst->route" of A (X is also the "dst->path" of A
2190 * in this example). If X is marked obsolete, "A" will not
2191 * notice. That's what we are validating here via the
2192 * stale_bundle() check.
2193 *
2194 * When a policy's bundle is pruned, we dst_free() the XFRM
2195 * dst which causes it's ->obsolete field to be set to a
2196 * positive non-zero integer. If an XFRM dst has been pruned
2197 * like this, we want to force a new route lookup.
2198 */
2199 if (dst->obsolete < 0 && !stale_bundle(dst))
2200 return dst;
2201
2202 return NULL;
2203 }
2204
2205 static int stale_bundle(struct dst_entry *dst)
2206 {
2207 return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
2208 }
2209
2210 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
2211 {
2212 while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
2213 dst->dev = dev_net(dev)->loopback_dev;
2214 dev_hold(dst->dev);
2215 dev_put(dev);
2216 }
2217 }
2218 EXPORT_SYMBOL(xfrm_dst_ifdown);
2219
2220 static void xfrm_link_failure(struct sk_buff *skb)
2221 {
2222 /* Impossible. Such dst must be popped before reaches point of failure. */
2223 }
2224
2225 static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
2226 {
2227 if (dst) {
2228 if (dst->obsolete) {
2229 dst_release(dst);
2230 dst = NULL;
2231 }
2232 }
2233 return dst;
2234 }
2235
2236 static void __xfrm_garbage_collect(struct net *net)
2237 {
2238 struct dst_entry *head, *next;
2239
2240 flow_cache_flush();
2241
2242 spin_lock_bh(&xfrm_policy_sk_bundle_lock);
2243 head = xfrm_policy_sk_bundles;
2244 xfrm_policy_sk_bundles = NULL;
2245 spin_unlock_bh(&xfrm_policy_sk_bundle_lock);
2246
2247 while (head) {
2248 next = head->next;
2249 dst_free(head);
2250 head = next;
2251 }
2252 }
2253
2254 static void xfrm_init_pmtu(struct dst_entry *dst)
2255 {
2256 do {
2257 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2258 u32 pmtu, route_mtu_cached;
2259
2260 pmtu = dst_mtu(dst->child);
2261 xdst->child_mtu_cached = pmtu;
2262
2263 pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
2264
2265 route_mtu_cached = dst_mtu(xdst->route);
2266 xdst->route_mtu_cached = route_mtu_cached;
2267
2268 if (pmtu > route_mtu_cached)
2269 pmtu = route_mtu_cached;
2270
2271 dst->metrics[RTAX_MTU-1] = pmtu;
2272 } while ((dst = dst->next));
2273 }
2274
2275 /* Check that the bundle accepts the flow and its components are
2276 * still valid.
2277 */
2278
2279 int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
2280 struct flowi *fl, int family, int strict)
2281 {
2282 struct dst_entry *dst = &first->u.dst;
2283 struct xfrm_dst *last;
2284 u32 mtu;
2285
2286 if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
2287 (dst->dev && !netif_running(dst->dev)))
2288 return 0;
2289 #ifdef CONFIG_XFRM_SUB_POLICY
2290 if (fl) {
2291 if (first->origin && !flow_cache_uli_match(first->origin, fl))
2292 return 0;
2293 if (first->partner &&
2294 !xfrm_selector_match(first->partner, fl, family))
2295 return 0;
2296 }
2297 #endif
2298
2299 last = NULL;
2300
2301 do {
2302 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
2303
2304 if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
2305 return 0;
2306 if (fl && pol &&
2307 !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
2308 return 0;
2309 if (dst->xfrm->km.state != XFRM_STATE_VALID)
2310 return 0;
2311 if (xdst->xfrm_genid != dst->xfrm->genid)
2312 return 0;
2313 if (xdst->num_pols > 0 &&
2314 xdst->policy_genid != atomic_read(&xdst->pols[0]->genid))
2315 return 0;
2316
2317 if (strict && fl &&
2318 !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2319 !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
2320 return 0;
2321
2322 mtu = dst_mtu(dst->child);
2323 if (xdst->child_mtu_cached != mtu) {
2324 last = xdst;
2325 xdst->child_mtu_cached = mtu;
2326 }
2327
2328 if (!dst_check(xdst->route, xdst->route_cookie))
2329 return 0;
2330 mtu = dst_mtu(xdst->route);
2331 if (xdst->route_mtu_cached != mtu) {
2332 last = xdst;
2333 xdst->route_mtu_cached = mtu;
2334 }
2335
2336 dst = dst->child;
2337 } while (dst->xfrm);
2338
2339 if (likely(!last))
2340 return 1;
2341
2342 mtu = last->child_mtu_cached;
2343 for (;;) {
2344 dst = &last->u.dst;
2345
2346 mtu = xfrm_state_mtu(dst->xfrm, mtu);
2347 if (mtu > last->route_mtu_cached)
2348 mtu = last->route_mtu_cached;
2349 dst->metrics[RTAX_MTU-1] = mtu;
2350
2351 if (last == first)
2352 break;
2353
2354 last = (struct xfrm_dst *)last->u.dst.next;
2355 last->child_mtu_cached = mtu;
2356 }
2357
2358 return 1;
2359 }
2360
2361 EXPORT_SYMBOL(xfrm_bundle_ok);
2362
2363 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
2364 {
2365 struct net *net;
2366 int err = 0;
2367 if (unlikely(afinfo == NULL))
2368 return -EINVAL;
2369 if (unlikely(afinfo->family >= NPROTO))
2370 return -EAFNOSUPPORT;
2371 write_lock_bh(&xfrm_policy_afinfo_lock);
2372 if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
2373 err = -ENOBUFS;
2374 else {
2375 struct dst_ops *dst_ops = afinfo->dst_ops;
2376 if (likely(dst_ops->kmem_cachep == NULL))
2377 dst_ops->kmem_cachep = xfrm_dst_cache;
2378 if (likely(dst_ops->check == NULL))
2379 dst_ops->check = xfrm_dst_check;
2380 if (likely(dst_ops->negative_advice == NULL))
2381 dst_ops->negative_advice = xfrm_negative_advice;
2382 if (likely(dst_ops->link_failure == NULL))
2383 dst_ops->link_failure = xfrm_link_failure;
2384 if (likely(afinfo->garbage_collect == NULL))
2385 afinfo->garbage_collect = __xfrm_garbage_collect;
2386 xfrm_policy_afinfo[afinfo->family] = afinfo;
2387 }
2388 write_unlock_bh(&xfrm_policy_afinfo_lock);
2389
2390 rtnl_lock();
2391 for_each_net(net) {
2392 struct dst_ops *xfrm_dst_ops;
2393
2394 switch (afinfo->family) {
2395 case AF_INET:
2396 xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops;
2397 break;
2398 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2399 case AF_INET6:
2400 xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops;
2401 break;
2402 #endif
2403 default:
2404 BUG();
2405 }
2406 *xfrm_dst_ops = *afinfo->dst_ops;
2407 }
2408 rtnl_unlock();
2409
2410 return err;
2411 }
2412 EXPORT_SYMBOL(xfrm_policy_register_afinfo);
2413
2414 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
2415 {
2416 int err = 0;
2417 if (unlikely(afinfo == NULL))
2418 return -EINVAL;
2419 if (unlikely(afinfo->family >= NPROTO))
2420 return -EAFNOSUPPORT;
2421 write_lock_bh(&xfrm_policy_afinfo_lock);
2422 if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
2423 if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
2424 err = -EINVAL;
2425 else {
2426 struct dst_ops *dst_ops = afinfo->dst_ops;
2427 xfrm_policy_afinfo[afinfo->family] = NULL;
2428 dst_ops->kmem_cachep = NULL;
2429 dst_ops->check = NULL;
2430 dst_ops->negative_advice = NULL;
2431 dst_ops->link_failure = NULL;
2432 afinfo->garbage_collect = NULL;
2433 }
2434 }
2435 write_unlock_bh(&xfrm_policy_afinfo_lock);
2436 return err;
2437 }
2438 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
2439
2440 static void __net_init xfrm_dst_ops_init(struct net *net)
2441 {
2442 struct xfrm_policy_afinfo *afinfo;
2443
2444 read_lock_bh(&xfrm_policy_afinfo_lock);
2445 afinfo = xfrm_policy_afinfo[AF_INET];
2446 if (afinfo)
2447 net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops;
2448 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2449 afinfo = xfrm_policy_afinfo[AF_INET6];
2450 if (afinfo)
2451 net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops;
2452 #endif
2453 read_unlock_bh(&xfrm_policy_afinfo_lock);
2454 }
2455
2456 static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
2457 {
2458 struct xfrm_policy_afinfo *afinfo;
2459 if (unlikely(family >= NPROTO))
2460 return NULL;
2461 read_lock(&xfrm_policy_afinfo_lock);
2462 afinfo = xfrm_policy_afinfo[family];
2463 if (unlikely(!afinfo))
2464 read_unlock(&xfrm_policy_afinfo_lock);
2465 return afinfo;
2466 }
2467
2468 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
2469 {
2470 read_unlock(&xfrm_policy_afinfo_lock);
2471 }
2472
2473 static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
2474 {
2475 struct net_device *dev = ptr;
2476
2477 switch (event) {
2478 case NETDEV_DOWN:
2479 __xfrm_garbage_collect(dev_net(dev));
2480 }
2481 return NOTIFY_DONE;
2482 }
2483
2484 static struct notifier_block xfrm_dev_notifier = {
2485 .notifier_call = xfrm_dev_event,
2486 };
2487
2488 #ifdef CONFIG_XFRM_STATISTICS
2489 static int __net_init xfrm_statistics_init(struct net *net)
2490 {
2491 int rv;
2492
2493 if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics,
2494 sizeof(struct linux_xfrm_mib),
2495 __alignof__(struct linux_xfrm_mib)) < 0)
2496 return -ENOMEM;
2497 rv = xfrm_proc_init(net);
2498 if (rv < 0)
2499 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2500 return rv;
2501 }
2502
2503 static void xfrm_statistics_fini(struct net *net)
2504 {
2505 xfrm_proc_fini(net);
2506 snmp_mib_free((void __percpu **)net->mib.xfrm_statistics);
2507 }
2508 #else
2509 static int __net_init xfrm_statistics_init(struct net *net)
2510 {
2511 return 0;
2512 }
2513
2514 static void xfrm_statistics_fini(struct net *net)
2515 {
2516 }
2517 #endif
2518
2519 static int __net_init xfrm_policy_init(struct net *net)
2520 {
2521 unsigned int hmask, sz;
2522 int dir;
2523
2524 if (net_eq(net, &init_net))
2525 xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
2526 sizeof(struct xfrm_dst),
2527 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
2528 NULL);
2529
2530 hmask = 8 - 1;
2531 sz = (hmask+1) * sizeof(struct hlist_head);
2532
2533 net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
2534 if (!net->xfrm.policy_byidx)
2535 goto out_byidx;
2536 net->xfrm.policy_idx_hmask = hmask;
2537
2538 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2539 struct xfrm_policy_hash *htab;
2540
2541 net->xfrm.policy_count[dir] = 0;
2542 INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]);
2543
2544 htab = &net->xfrm.policy_bydst[dir];
2545 htab->table = xfrm_hash_alloc(sz);
2546 if (!htab->table)
2547 goto out_bydst;
2548 htab->hmask = hmask;
2549 }
2550
2551 INIT_LIST_HEAD(&net->xfrm.policy_all);
2552 INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize);
2553 if (net_eq(net, &init_net))
2554 register_netdevice_notifier(&xfrm_dev_notifier);
2555 return 0;
2556
2557 out_bydst:
2558 for (dir--; dir >= 0; dir--) {
2559 struct xfrm_policy_hash *htab;
2560
2561 htab = &net->xfrm.policy_bydst[dir];
2562 xfrm_hash_free(htab->table, sz);
2563 }
2564 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2565 out_byidx:
2566 return -ENOMEM;
2567 }
2568
2569 static void xfrm_policy_fini(struct net *net)
2570 {
2571 struct xfrm_audit audit_info;
2572 unsigned int sz;
2573 int dir;
2574
2575 flush_work(&net->xfrm.policy_hash_work);
2576 #ifdef CONFIG_XFRM_SUB_POLICY
2577 audit_info.loginuid = -1;
2578 audit_info.sessionid = -1;
2579 audit_info.secid = 0;
2580 xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info);
2581 #endif
2582 audit_info.loginuid = -1;
2583 audit_info.sessionid = -1;
2584 audit_info.secid = 0;
2585 xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2586
2587 WARN_ON(!list_empty(&net->xfrm.policy_all));
2588
2589 for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
2590 struct xfrm_policy_hash *htab;
2591
2592 WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir]));
2593
2594 htab = &net->xfrm.policy_bydst[dir];
2595 sz = (htab->hmask + 1);
2596 WARN_ON(!hlist_empty(htab->table));
2597 xfrm_hash_free(htab->table, sz);
2598 }
2599
2600 sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
2601 WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
2602 xfrm_hash_free(net->xfrm.policy_byidx, sz);
2603 }
2604
2605 static int __net_init xfrm_net_init(struct net *net)
2606 {
2607 int rv;
2608
2609 rv = xfrm_statistics_init(net);
2610 if (rv < 0)
2611 goto out_statistics;
2612 rv = xfrm_state_init(net);
2613 if (rv < 0)
2614 goto out_state;
2615 rv = xfrm_policy_init(net);
2616 if (rv < 0)
2617 goto out_policy;
2618 xfrm_dst_ops_init(net);
2619 rv = xfrm_sysctl_init(net);
2620 if (rv < 0)
2621 goto out_sysctl;
2622 return 0;
2623
2624 out_sysctl:
2625 xfrm_policy_fini(net);
2626 out_policy:
2627 xfrm_state_fini(net);
2628 out_state:
2629 xfrm_statistics_fini(net);
2630 out_statistics:
2631 return rv;
2632 }
2633
2634 static void __net_exit xfrm_net_exit(struct net *net)
2635 {
2636 xfrm_sysctl_fini(net);
2637 xfrm_policy_fini(net);
2638 xfrm_state_fini(net);
2639 xfrm_statistics_fini(net);
2640 }
2641
2642 static struct pernet_operations __net_initdata xfrm_net_ops = {
2643 .init = xfrm_net_init,
2644 .exit = xfrm_net_exit,
2645 };
2646
2647 void __init xfrm_init(void)
2648 {
2649 register_pernet_subsys(&xfrm_net_ops);
2650 xfrm_input_init();
2651 }
2652
2653 #ifdef CONFIG_AUDITSYSCALL
2654 static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
2655 struct audit_buffer *audit_buf)
2656 {
2657 struct xfrm_sec_ctx *ctx = xp->security;
2658 struct xfrm_selector *sel = &xp->selector;
2659
2660 if (ctx)
2661 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2662 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2663
2664 switch(sel->family) {
2665 case AF_INET:
2666 audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4);
2667 if (sel->prefixlen_s != 32)
2668 audit_log_format(audit_buf, " src_prefixlen=%d",
2669 sel->prefixlen_s);
2670 audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4);
2671 if (sel->prefixlen_d != 32)
2672 audit_log_format(audit_buf, " dst_prefixlen=%d",
2673 sel->prefixlen_d);
2674 break;
2675 case AF_INET6:
2676 audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6);
2677 if (sel->prefixlen_s != 128)
2678 audit_log_format(audit_buf, " src_prefixlen=%d",
2679 sel->prefixlen_s);
2680 audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6);
2681 if (sel->prefixlen_d != 128)
2682 audit_log_format(audit_buf, " dst_prefixlen=%d",
2683 sel->prefixlen_d);
2684 break;
2685 }
2686 }
2687
2688 void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
2689 uid_t auid, u32 sessionid, u32 secid)
2690 {
2691 struct audit_buffer *audit_buf;
2692
2693 audit_buf = xfrm_audit_start("SPD-add");
2694 if (audit_buf == NULL)
2695 return;
2696 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2697 audit_log_format(audit_buf, " res=%u", result);
2698 xfrm_audit_common_policyinfo(xp, audit_buf);
2699 audit_log_end(audit_buf);
2700 }
2701 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
2702
2703 void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
2704 uid_t auid, u32 sessionid, u32 secid)
2705 {
2706 struct audit_buffer *audit_buf;
2707
2708 audit_buf = xfrm_audit_start("SPD-delete");
2709 if (audit_buf == NULL)
2710 return;
2711 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2712 audit_log_format(audit_buf, " res=%u", result);
2713 xfrm_audit_common_policyinfo(xp, audit_buf);
2714 audit_log_end(audit_buf);
2715 }
2716 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
2717 #endif
2718
2719 #ifdef CONFIG_XFRM_MIGRATE
2720 static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
2721 struct xfrm_selector *sel_tgt)
2722 {
2723 if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
2724 if (sel_tgt->family == sel_cmp->family &&
2725 xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
2726 sel_cmp->family) == 0 &&
2727 xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
2728 sel_cmp->family) == 0 &&
2729 sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
2730 sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
2731 return 1;
2732 }
2733 } else {
2734 if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
2735 return 1;
2736 }
2737 }
2738 return 0;
2739 }
2740
2741 static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
2742 u8 dir, u8 type)
2743 {
2744 struct xfrm_policy *pol, *ret = NULL;
2745 struct hlist_node *entry;
2746 struct hlist_head *chain;
2747 u32 priority = ~0U;
2748
2749 read_lock_bh(&xfrm_policy_lock);
2750 chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir);
2751 hlist_for_each_entry(pol, entry, chain, bydst) {
2752 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2753 pol->type == type) {
2754 ret = pol;
2755 priority = ret->priority;
2756 break;
2757 }
2758 }
2759 chain = &init_net.xfrm.policy_inexact[dir];
2760 hlist_for_each_entry(pol, entry, chain, bydst) {
2761 if (xfrm_migrate_selector_match(sel, &pol->selector) &&
2762 pol->type == type &&
2763 pol->priority < priority) {
2764 ret = pol;
2765 break;
2766 }
2767 }
2768
2769 if (ret)
2770 xfrm_pol_hold(ret);
2771
2772 read_unlock_bh(&xfrm_policy_lock);
2773
2774 return ret;
2775 }
2776
2777 static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
2778 {
2779 int match = 0;
2780
2781 if (t->mode == m->mode && t->id.proto == m->proto &&
2782 (m->reqid == 0 || t->reqid == m->reqid)) {
2783 switch (t->mode) {
2784 case XFRM_MODE_TUNNEL:
2785 case XFRM_MODE_BEET:
2786 if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
2787 m->old_family) == 0 &&
2788 xfrm_addr_cmp(&t->saddr, &m->old_saddr,
2789 m->old_family) == 0) {
2790 match = 1;
2791 }
2792 break;
2793 case XFRM_MODE_TRANSPORT:
2794 /* in case of transport mode, template does not store
2795 any IP addresses, hence we just compare mode and
2796 protocol */
2797 match = 1;
2798 break;
2799 default:
2800 break;
2801 }
2802 }
2803 return match;
2804 }
2805
2806 /* update endpoint address(es) of template(s) */
2807 static int xfrm_policy_migrate(struct xfrm_policy *pol,
2808 struct xfrm_migrate *m, int num_migrate)
2809 {
2810 struct xfrm_migrate *mp;
2811 int i, j, n = 0;
2812
2813 write_lock_bh(&pol->lock);
2814 if (unlikely(pol->walk.dead)) {
2815 /* target policy has been deleted */
2816 write_unlock_bh(&pol->lock);
2817 return -ENOENT;
2818 }
2819
2820 for (i = 0; i < pol->xfrm_nr; i++) {
2821 for (j = 0, mp = m; j < num_migrate; j++, mp++) {
2822 if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
2823 continue;
2824 n++;
2825 if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
2826 pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
2827 continue;
2828 /* update endpoints */
2829 memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
2830 sizeof(pol->xfrm_vec[i].id.daddr));
2831 memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
2832 sizeof(pol->xfrm_vec[i].saddr));
2833 pol->xfrm_vec[i].encap_family = mp->new_family;
2834 /* flush bundles */
2835 atomic_inc(&pol->genid);
2836 }
2837 }
2838
2839 write_unlock_bh(&pol->lock);
2840
2841 if (!n)
2842 return -ENODATA;
2843
2844 return 0;
2845 }
2846
2847 static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
2848 {
2849 int i, j;
2850
2851 if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
2852 return -EINVAL;
2853
2854 for (i = 0; i < num_migrate; i++) {
2855 if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
2856 m[i].old_family) == 0) &&
2857 (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
2858 m[i].old_family) == 0))
2859 return -EINVAL;
2860 if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
2861 xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
2862 return -EINVAL;
2863
2864 /* check if there is any duplicated entry */
2865 for (j = i + 1; j < num_migrate; j++) {
2866 if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
2867 sizeof(m[i].old_daddr)) &&
2868 !memcmp(&m[i].old_saddr, &m[j].old_saddr,
2869 sizeof(m[i].old_saddr)) &&
2870 m[i].proto == m[j].proto &&
2871 m[i].mode == m[j].mode &&
2872 m[i].reqid == m[j].reqid &&
2873 m[i].old_family == m[j].old_family)
2874 return -EINVAL;
2875 }
2876 }
2877
2878 return 0;
2879 }
2880
2881 int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
2882 struct xfrm_migrate *m, int num_migrate,
2883 struct xfrm_kmaddress *k)
2884 {
2885 int i, err, nx_cur = 0, nx_new = 0;
2886 struct xfrm_policy *pol = NULL;
2887 struct xfrm_state *x, *xc;
2888 struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
2889 struct xfrm_state *x_new[XFRM_MAX_DEPTH];
2890 struct xfrm_migrate *mp;
2891
2892 if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
2893 goto out;
2894
2895 /* Stage 1 - find policy */
2896 if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
2897 err = -ENOENT;
2898 goto out;
2899 }
2900
2901 /* Stage 2 - find and update state(s) */
2902 for (i = 0, mp = m; i < num_migrate; i++, mp++) {
2903 if ((x = xfrm_migrate_state_find(mp))) {
2904 x_cur[nx_cur] = x;
2905 nx_cur++;
2906 if ((xc = xfrm_state_migrate(x, mp))) {
2907 x_new[nx_new] = xc;
2908 nx_new++;
2909 } else {
2910 err = -ENODATA;
2911 goto restore_state;
2912 }
2913 }
2914 }
2915
2916 /* Stage 3 - update policy */
2917 if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
2918 goto restore_state;
2919
2920 /* Stage 4 - delete old state(s) */
2921 if (nx_cur) {
2922 xfrm_states_put(x_cur, nx_cur);
2923 xfrm_states_delete(x_cur, nx_cur);
2924 }
2925
2926 /* Stage 5 - announce */
2927 km_migrate(sel, dir, type, m, num_migrate, k);
2928
2929 xfrm_pol_put(pol);
2930
2931 return 0;
2932 out:
2933 return err;
2934
2935 restore_state:
2936 if (pol)
2937 xfrm_pol_put(pol);
2938 if (nx_cur)
2939 xfrm_states_put(x_cur, nx_cur);
2940 if (nx_new)
2941 xfrm_states_delete(x_new, nx_new);
2942
2943 return err;
2944 }
2945 EXPORT_SYMBOL(xfrm_migrate);
2946 #endif
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree