Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
16 | #include <linux/slab.h> |
17 | #include <linux/kmod.h> | |
18 | #include <linux/list.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/workqueue.h> | |
21 | #include <linux/notifier.h> | |
22 | #include <linux/netdevice.h> | |
eb9c7ebe | 23 | #include <linux/netfilter.h> |
1da177e4 | 24 | #include <linux/module.h> |
2518c7c2 | 25 | #include <linux/cache.h> |
1da177e4 LT |
26 | #include <net/xfrm.h> |
27 | #include <net/ip.h> | |
161a09e7 | 28 | #include <linux/audit.h> |
1da177e4 | 29 | |
44e36b42 DM |
30 | #include "xfrm_hash.h" |
31 | ||
14e50e57 DM |
32 | int sysctl_xfrm_larval_drop; |
33 | ||
4a3e2f71 AV |
34 | DEFINE_MUTEX(xfrm_cfg_mutex); |
35 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 LT |
36 | |
37 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
38 | ||
2518c7c2 DM |
39 | unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
40 | EXPORT_SYMBOL(xfrm_policy_count); | |
1da177e4 LT |
41 | |
42 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
43 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
44 | ||
e18b890b | 45 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 LT |
46 | |
47 | static struct work_struct xfrm_policy_gc_work; | |
2518c7c2 | 48 | static HLIST_HEAD(xfrm_policy_gc_list); |
1da177e4 LT |
49 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
50 | ||
51 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
52 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
546be240 HX |
53 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family); |
54 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo); | |
1da177e4 | 55 | |
77681021 AM |
56 | static inline int |
57 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
58 | { | |
59 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
60 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
61 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
62 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
63 | (fl->proto == sel->proto || !sel->proto) && | |
64 | (fl->oif == sel->ifindex || !sel->ifindex); | |
65 | } | |
66 | ||
67 | static inline int | |
68 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
69 | { | |
70 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
71 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
72 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
73 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
74 | (fl->proto == sel->proto || !sel->proto) && | |
75 | (fl->oif == sel->ifindex || !sel->ifindex); | |
76 | } | |
77 | ||
78 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
79 | unsigned short family) | |
80 | { | |
81 | switch (family) { | |
82 | case AF_INET: | |
83 | return __xfrm4_selector_match(sel, fl); | |
84 | case AF_INET6: | |
85 | return __xfrm6_selector_match(sel, fl); | |
86 | } | |
87 | return 0; | |
88 | } | |
89 | ||
1da177e4 LT |
90 | int xfrm_register_type(struct xfrm_type *type, unsigned short family) |
91 | { | |
546be240 HX |
92 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family); |
93 | struct xfrm_type **typemap; | |
1da177e4 LT |
94 | int err = 0; |
95 | ||
96 | if (unlikely(afinfo == NULL)) | |
97 | return -EAFNOSUPPORT; | |
98 | typemap = afinfo->type_map; | |
99 | ||
546be240 HX |
100 | if (likely(typemap[type->proto] == NULL)) |
101 | typemap[type->proto] = type; | |
1da177e4 LT |
102 | else |
103 | err = -EEXIST; | |
546be240 | 104 | xfrm_policy_unlock_afinfo(afinfo); |
1da177e4 LT |
105 | return err; |
106 | } | |
107 | EXPORT_SYMBOL(xfrm_register_type); | |
108 | ||
109 | int xfrm_unregister_type(struct xfrm_type *type, unsigned short family) | |
110 | { | |
546be240 HX |
111 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family); |
112 | struct xfrm_type **typemap; | |
1da177e4 LT |
113 | int err = 0; |
114 | ||
115 | if (unlikely(afinfo == NULL)) | |
116 | return -EAFNOSUPPORT; | |
117 | typemap = afinfo->type_map; | |
118 | ||
546be240 | 119 | if (unlikely(typemap[type->proto] != type)) |
1da177e4 LT |
120 | err = -ENOENT; |
121 | else | |
546be240 HX |
122 | typemap[type->proto] = NULL; |
123 | xfrm_policy_unlock_afinfo(afinfo); | |
1da177e4 LT |
124 | return err; |
125 | } | |
126 | EXPORT_SYMBOL(xfrm_unregister_type); | |
127 | ||
128 | struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) | |
129 | { | |
130 | struct xfrm_policy_afinfo *afinfo; | |
546be240 | 131 | struct xfrm_type **typemap; |
1da177e4 LT |
132 | struct xfrm_type *type; |
133 | int modload_attempted = 0; | |
134 | ||
135 | retry: | |
136 | afinfo = xfrm_policy_get_afinfo(family); | |
137 | if (unlikely(afinfo == NULL)) | |
138 | return NULL; | |
139 | typemap = afinfo->type_map; | |
140 | ||
546be240 | 141 | type = typemap[proto]; |
1da177e4 LT |
142 | if (unlikely(type && !try_module_get(type->owner))) |
143 | type = NULL; | |
1da177e4 LT |
144 | if (!type && !modload_attempted) { |
145 | xfrm_policy_put_afinfo(afinfo); | |
146 | request_module("xfrm-type-%d-%d", | |
147 | (int) family, (int) proto); | |
148 | modload_attempted = 1; | |
149 | goto retry; | |
150 | } | |
151 | ||
152 | xfrm_policy_put_afinfo(afinfo); | |
153 | return type; | |
154 | } | |
1da177e4 | 155 | |
a716c119 | 156 | int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, |
1da177e4 LT |
157 | unsigned short family) |
158 | { | |
159 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
160 | int err = 0; | |
161 | ||
162 | if (unlikely(afinfo == NULL)) | |
163 | return -EAFNOSUPPORT; | |
164 | ||
165 | if (likely(afinfo->dst_lookup != NULL)) | |
166 | err = afinfo->dst_lookup(dst, fl); | |
167 | else | |
168 | err = -EINVAL; | |
169 | xfrm_policy_put_afinfo(afinfo); | |
170 | return err; | |
171 | } | |
172 | EXPORT_SYMBOL(xfrm_dst_lookup); | |
173 | ||
174 | void xfrm_put_type(struct xfrm_type *type) | |
175 | { | |
176 | module_put(type->owner); | |
177 | } | |
178 | ||
b59f45d0 HX |
179 | int xfrm_register_mode(struct xfrm_mode *mode, int family) |
180 | { | |
181 | struct xfrm_policy_afinfo *afinfo; | |
182 | struct xfrm_mode **modemap; | |
183 | int err; | |
184 | ||
185 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
186 | return -EINVAL; | |
187 | ||
188 | afinfo = xfrm_policy_lock_afinfo(family); | |
189 | if (unlikely(afinfo == NULL)) | |
190 | return -EAFNOSUPPORT; | |
191 | ||
192 | err = -EEXIST; | |
193 | modemap = afinfo->mode_map; | |
194 | if (likely(modemap[mode->encap] == NULL)) { | |
195 | modemap[mode->encap] = mode; | |
196 | err = 0; | |
197 | } | |
198 | ||
199 | xfrm_policy_unlock_afinfo(afinfo); | |
200 | return err; | |
201 | } | |
202 | EXPORT_SYMBOL(xfrm_register_mode); | |
203 | ||
204 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
205 | { | |
206 | struct xfrm_policy_afinfo *afinfo; | |
207 | struct xfrm_mode **modemap; | |
208 | int err; | |
209 | ||
210 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
211 | return -EINVAL; | |
212 | ||
213 | afinfo = xfrm_policy_lock_afinfo(family); | |
214 | if (unlikely(afinfo == NULL)) | |
215 | return -EAFNOSUPPORT; | |
216 | ||
217 | err = -ENOENT; | |
218 | modemap = afinfo->mode_map; | |
219 | if (likely(modemap[mode->encap] == mode)) { | |
220 | modemap[mode->encap] = NULL; | |
221 | err = 0; | |
222 | } | |
223 | ||
224 | xfrm_policy_unlock_afinfo(afinfo); | |
225 | return err; | |
226 | } | |
227 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
228 | ||
229 | struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
230 | { | |
231 | struct xfrm_policy_afinfo *afinfo; | |
232 | struct xfrm_mode *mode; | |
233 | int modload_attempted = 0; | |
234 | ||
235 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
236 | return NULL; | |
237 | ||
238 | retry: | |
239 | afinfo = xfrm_policy_get_afinfo(family); | |
240 | if (unlikely(afinfo == NULL)) | |
241 | return NULL; | |
242 | ||
243 | mode = afinfo->mode_map[encap]; | |
244 | if (unlikely(mode && !try_module_get(mode->owner))) | |
245 | mode = NULL; | |
246 | if (!mode && !modload_attempted) { | |
247 | xfrm_policy_put_afinfo(afinfo); | |
248 | request_module("xfrm-mode-%d-%d", family, encap); | |
249 | modload_attempted = 1; | |
250 | goto retry; | |
251 | } | |
252 | ||
253 | xfrm_policy_put_afinfo(afinfo); | |
254 | return mode; | |
255 | } | |
256 | ||
257 | void xfrm_put_mode(struct xfrm_mode *mode) | |
258 | { | |
259 | module_put(mode->owner); | |
260 | } | |
261 | ||
1da177e4 LT |
262 | static inline unsigned long make_jiffies(long secs) |
263 | { | |
264 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
265 | return MAX_SCHEDULE_TIMEOUT-1; | |
266 | else | |
a716c119 | 267 | return secs*HZ; |
1da177e4 LT |
268 | } |
269 | ||
270 | static void xfrm_policy_timer(unsigned long data) | |
271 | { | |
272 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 273 | unsigned long now = get_seconds(); |
1da177e4 LT |
274 | long next = LONG_MAX; |
275 | int warn = 0; | |
276 | int dir; | |
277 | ||
278 | read_lock(&xp->lock); | |
279 | ||
280 | if (xp->dead) | |
281 | goto out; | |
282 | ||
77d8d7a6 | 283 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
284 | |
285 | if (xp->lft.hard_add_expires_seconds) { | |
286 | long tmo = xp->lft.hard_add_expires_seconds + | |
287 | xp->curlft.add_time - now; | |
288 | if (tmo <= 0) | |
289 | goto expired; | |
290 | if (tmo < next) | |
291 | next = tmo; | |
292 | } | |
293 | if (xp->lft.hard_use_expires_seconds) { | |
294 | long tmo = xp->lft.hard_use_expires_seconds + | |
295 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
296 | if (tmo <= 0) | |
297 | goto expired; | |
298 | if (tmo < next) | |
299 | next = tmo; | |
300 | } | |
301 | if (xp->lft.soft_add_expires_seconds) { | |
302 | long tmo = xp->lft.soft_add_expires_seconds + | |
303 | xp->curlft.add_time - now; | |
304 | if (tmo <= 0) { | |
305 | warn = 1; | |
306 | tmo = XFRM_KM_TIMEOUT; | |
307 | } | |
308 | if (tmo < next) | |
309 | next = tmo; | |
310 | } | |
311 | if (xp->lft.soft_use_expires_seconds) { | |
312 | long tmo = xp->lft.soft_use_expires_seconds + | |
313 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
314 | if (tmo <= 0) { | |
315 | warn = 1; | |
316 | tmo = XFRM_KM_TIMEOUT; | |
317 | } | |
318 | if (tmo < next) | |
319 | next = tmo; | |
320 | } | |
321 | ||
322 | if (warn) | |
6c5c8ca7 | 323 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
324 | if (next != LONG_MAX && |
325 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
326 | xfrm_pol_hold(xp); | |
327 | ||
328 | out: | |
329 | read_unlock(&xp->lock); | |
330 | xfrm_pol_put(xp); | |
331 | return; | |
332 | ||
333 | expired: | |
334 | read_unlock(&xp->lock); | |
4666faab | 335 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 336 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
337 | xfrm_pol_put(xp); |
338 | } | |
339 | ||
340 | ||
341 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
342 | * SPD calls. | |
343 | */ | |
344 | ||
dd0fc66f | 345 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
1da177e4 LT |
346 | { |
347 | struct xfrm_policy *policy; | |
348 | ||
0da974f4 | 349 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
350 | |
351 | if (policy) { | |
2518c7c2 DM |
352 | INIT_HLIST_NODE(&policy->bydst); |
353 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 354 | rwlock_init(&policy->lock); |
2518c7c2 | 355 | atomic_set(&policy->refcnt, 1); |
1da177e4 LT |
356 | init_timer(&policy->timer); |
357 | policy->timer.data = (unsigned long)policy; | |
358 | policy->timer.function = xfrm_policy_timer; | |
359 | } | |
360 | return policy; | |
361 | } | |
362 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
363 | ||
364 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
365 | ||
366 | void __xfrm_policy_destroy(struct xfrm_policy *policy) | |
367 | { | |
09a62660 | 368 | BUG_ON(!policy->dead); |
1da177e4 | 369 | |
09a62660 | 370 | BUG_ON(policy->bundles); |
1da177e4 LT |
371 | |
372 | if (del_timer(&policy->timer)) | |
373 | BUG(); | |
374 | ||
df71837d | 375 | security_xfrm_policy_free(policy); |
1da177e4 LT |
376 | kfree(policy); |
377 | } | |
378 | EXPORT_SYMBOL(__xfrm_policy_destroy); | |
379 | ||
380 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
381 | { | |
382 | struct dst_entry *dst; | |
383 | ||
384 | while ((dst = policy->bundles) != NULL) { | |
385 | policy->bundles = dst->next; | |
386 | dst_free(dst); | |
387 | } | |
388 | ||
389 | if (del_timer(&policy->timer)) | |
390 | atomic_dec(&policy->refcnt); | |
391 | ||
392 | if (atomic_read(&policy->refcnt) > 1) | |
393 | flow_cache_flush(); | |
394 | ||
395 | xfrm_pol_put(policy); | |
396 | } | |
397 | ||
c4028958 | 398 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
399 | { |
400 | struct xfrm_policy *policy; | |
2518c7c2 DM |
401 | struct hlist_node *entry, *tmp; |
402 | struct hlist_head gc_list; | |
1da177e4 LT |
403 | |
404 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
405 | gc_list.first = xfrm_policy_gc_list.first; |
406 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
407 | spin_unlock_bh(&xfrm_policy_gc_lock); |
408 | ||
2518c7c2 | 409 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 410 | xfrm_policy_gc_kill(policy); |
1da177e4 LT |
411 | } |
412 | ||
413 | /* Rule must be locked. Release descentant resources, announce | |
414 | * entry dead. The rule must be unlinked from lists to the moment. | |
415 | */ | |
416 | ||
417 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
418 | { | |
419 | int dead; | |
420 | ||
421 | write_lock_bh(&policy->lock); | |
422 | dead = policy->dead; | |
423 | policy->dead = 1; | |
424 | write_unlock_bh(&policy->lock); | |
425 | ||
426 | if (unlikely(dead)) { | |
427 | WARN_ON(1); | |
428 | return; | |
429 | } | |
430 | ||
431 | spin_lock(&xfrm_policy_gc_lock); | |
2518c7c2 | 432 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
1da177e4 LT |
433 | spin_unlock(&xfrm_policy_gc_lock); |
434 | ||
435 | schedule_work(&xfrm_policy_gc_work); | |
436 | } | |
437 | ||
2518c7c2 DM |
438 | struct xfrm_policy_hash { |
439 | struct hlist_head *table; | |
440 | unsigned int hmask; | |
441 | }; | |
442 | ||
443 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
444 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
445 | static struct hlist_head *xfrm_policy_byidx __read_mostly; | |
446 | static unsigned int xfrm_idx_hmask __read_mostly; | |
447 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
448 | ||
2518c7c2 DM |
449 | static inline unsigned int idx_hash(u32 index) |
450 | { | |
451 | return __idx_hash(index, xfrm_idx_hmask); | |
452 | } | |
453 | ||
2518c7c2 DM |
454 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
455 | { | |
456 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
457 | unsigned int hash = __sel_hash(sel, family, hmask); | |
458 | ||
459 | return (hash == hmask + 1 ? | |
460 | &xfrm_policy_inexact[dir] : | |
461 | xfrm_policy_bydst[dir].table + hash); | |
462 | } | |
463 | ||
464 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
465 | { | |
466 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
467 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
468 | ||
469 | return xfrm_policy_bydst[dir].table + hash; | |
470 | } | |
471 | ||
2518c7c2 DM |
472 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
473 | struct hlist_head *ndsttable, | |
474 | unsigned int nhashmask) | |
475 | { | |
476 | struct hlist_node *entry, *tmp; | |
477 | struct xfrm_policy *pol; | |
478 | ||
479 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { | |
480 | unsigned int h; | |
481 | ||
482 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
483 | pol->family, nhashmask); | |
484 | hlist_add_head(&pol->bydst, ndsttable+h); | |
485 | } | |
486 | } | |
487 | ||
488 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
489 | struct hlist_head *nidxtable, | |
490 | unsigned int nhashmask) | |
491 | { | |
492 | struct hlist_node *entry, *tmp; | |
493 | struct xfrm_policy *pol; | |
494 | ||
495 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
496 | unsigned int h; | |
497 | ||
498 | h = __idx_hash(pol->index, nhashmask); | |
499 | hlist_add_head(&pol->byidx, nidxtable+h); | |
500 | } | |
501 | } | |
502 | ||
503 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
504 | { | |
505 | return ((old_hmask + 1) << 1) - 1; | |
506 | } | |
507 | ||
508 | static void xfrm_bydst_resize(int dir) | |
509 | { | |
510 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
511 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
512 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
513 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 514 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
515 | int i; |
516 | ||
517 | if (!ndst) | |
518 | return; | |
519 | ||
520 | write_lock_bh(&xfrm_policy_lock); | |
521 | ||
522 | for (i = hmask; i >= 0; i--) | |
523 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
524 | ||
525 | xfrm_policy_bydst[dir].table = ndst; | |
526 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
527 | ||
528 | write_unlock_bh(&xfrm_policy_lock); | |
529 | ||
44e36b42 | 530 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
531 | } |
532 | ||
533 | static void xfrm_byidx_resize(int total) | |
534 | { | |
535 | unsigned int hmask = xfrm_idx_hmask; | |
536 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
537 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
538 | struct hlist_head *oidx = xfrm_policy_byidx; | |
44e36b42 | 539 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
540 | int i; |
541 | ||
542 | if (!nidx) | |
543 | return; | |
544 | ||
545 | write_lock_bh(&xfrm_policy_lock); | |
546 | ||
547 | for (i = hmask; i >= 0; i--) | |
548 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
549 | ||
550 | xfrm_policy_byidx = nidx; | |
551 | xfrm_idx_hmask = nhashmask; | |
552 | ||
553 | write_unlock_bh(&xfrm_policy_lock); | |
554 | ||
44e36b42 | 555 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
556 | } |
557 | ||
558 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
559 | { | |
560 | unsigned int cnt = xfrm_policy_count[dir]; | |
561 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
562 | ||
563 | if (total) | |
564 | *total += cnt; | |
565 | ||
566 | if ((hmask + 1) < xfrm_policy_hashmax && | |
567 | cnt > hmask) | |
568 | return 1; | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
573 | static inline int xfrm_byidx_should_resize(int total) | |
574 | { | |
575 | unsigned int hmask = xfrm_idx_hmask; | |
576 | ||
577 | if ((hmask + 1) < xfrm_policy_hashmax && | |
578 | total > hmask) | |
579 | return 1; | |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
5a6d3416 | 584 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
585 | { |
586 | read_lock_bh(&xfrm_policy_lock); | |
587 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
588 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
589 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
590 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
591 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
592 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
593 | si->spdhcnt = xfrm_idx_hmask; | |
594 | si->spdhmcnt = xfrm_policy_hashmax; | |
595 | read_unlock_bh(&xfrm_policy_lock); | |
596 | } | |
597 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 598 | |
ecfd6b18 | 599 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 600 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
601 | { |
602 | int dir, total; | |
603 | ||
604 | mutex_lock(&hash_resize_mutex); | |
605 | ||
606 | total = 0; | |
607 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
608 | if (xfrm_bydst_should_resize(dir, &total)) | |
609 | xfrm_bydst_resize(dir); | |
610 | } | |
611 | if (xfrm_byidx_should_resize(total)) | |
612 | xfrm_byidx_resize(total); | |
613 | ||
614 | mutex_unlock(&hash_resize_mutex); | |
615 | } | |
616 | ||
c4028958 | 617 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 618 | |
1da177e4 LT |
619 | /* Generate new index... KAME seems to generate them ordered by cost |
620 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
4e81bb83 | 621 | static u32 xfrm_gen_index(u8 type, int dir) |
1da177e4 | 622 | { |
1da177e4 LT |
623 | static u32 idx_generator; |
624 | ||
625 | for (;;) { | |
2518c7c2 DM |
626 | struct hlist_node *entry; |
627 | struct hlist_head *list; | |
628 | struct xfrm_policy *p; | |
629 | u32 idx; | |
630 | int found; | |
631 | ||
1da177e4 LT |
632 | idx = (idx_generator | dir); |
633 | idx_generator += 8; | |
634 | if (idx == 0) | |
635 | idx = 8; | |
2518c7c2 DM |
636 | list = xfrm_policy_byidx + idx_hash(idx); |
637 | found = 0; | |
638 | hlist_for_each_entry(p, entry, list, byidx) { | |
639 | if (p->index == idx) { | |
640 | found = 1; | |
1da177e4 | 641 | break; |
2518c7c2 | 642 | } |
1da177e4 | 643 | } |
2518c7c2 | 644 | if (!found) |
1da177e4 LT |
645 | return idx; |
646 | } | |
647 | } | |
648 | ||
2518c7c2 DM |
649 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
650 | { | |
651 | u32 *p1 = (u32 *) s1; | |
652 | u32 *p2 = (u32 *) s2; | |
653 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
654 | int i; | |
655 | ||
656 | for (i = 0; i < len; i++) { | |
657 | if (p1[i] != p2[i]) | |
658 | return 1; | |
659 | } | |
660 | ||
661 | return 0; | |
662 | } | |
663 | ||
1da177e4 LT |
664 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
665 | { | |
2518c7c2 DM |
666 | struct xfrm_policy *pol; |
667 | struct xfrm_policy *delpol; | |
668 | struct hlist_head *chain; | |
a6c7ab55 | 669 | struct hlist_node *entry, *newpos; |
9b78a82c | 670 | struct dst_entry *gc_list; |
1da177e4 LT |
671 | |
672 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
673 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
674 | delpol = NULL; | |
675 | newpos = NULL; | |
2518c7c2 | 676 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 677 | if (pol->type == policy->type && |
2518c7c2 | 678 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
679 | xfrm_sec_ctx_match(pol->security, policy->security) && |
680 | !WARN_ON(delpol)) { | |
1da177e4 LT |
681 | if (excl) { |
682 | write_unlock_bh(&xfrm_policy_lock); | |
683 | return -EEXIST; | |
684 | } | |
1da177e4 LT |
685 | delpol = pol; |
686 | if (policy->priority > pol->priority) | |
687 | continue; | |
688 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 689 | newpos = &pol->bydst; |
1da177e4 LT |
690 | continue; |
691 | } | |
1da177e4 LT |
692 | if (delpol) |
693 | break; | |
1da177e4 LT |
694 | } |
695 | if (newpos) | |
2518c7c2 DM |
696 | hlist_add_after(newpos, &policy->bydst); |
697 | else | |
698 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 699 | xfrm_pol_hold(policy); |
2518c7c2 | 700 | xfrm_policy_count[dir]++; |
1da177e4 | 701 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
702 | if (delpol) { |
703 | hlist_del(&delpol->bydst); | |
704 | hlist_del(&delpol->byidx); | |
705 | xfrm_policy_count[dir]--; | |
706 | } | |
4e81bb83 | 707 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 708 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 709 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
710 | policy->curlft.use_time = 0; |
711 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
712 | xfrm_pol_hold(policy); | |
713 | write_unlock_bh(&xfrm_policy_lock); | |
714 | ||
9b78a82c | 715 | if (delpol) |
1da177e4 | 716 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
717 | else if (xfrm_bydst_should_resize(dir, NULL)) |
718 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
719 | |
720 | read_lock_bh(&xfrm_policy_lock); | |
721 | gc_list = NULL; | |
2518c7c2 DM |
722 | entry = &policy->bydst; |
723 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
724 | struct dst_entry *dst; |
725 | ||
726 | write_lock(&policy->lock); | |
727 | dst = policy->bundles; | |
728 | if (dst) { | |
729 | struct dst_entry *tail = dst; | |
730 | while (tail->next) | |
731 | tail = tail->next; | |
732 | tail->next = gc_list; | |
733 | gc_list = dst; | |
734 | ||
735 | policy->bundles = NULL; | |
736 | } | |
737 | write_unlock(&policy->lock); | |
1da177e4 | 738 | } |
9b78a82c DM |
739 | read_unlock_bh(&xfrm_policy_lock); |
740 | ||
741 | while (gc_list) { | |
742 | struct dst_entry *dst = gc_list; | |
743 | ||
744 | gc_list = dst->next; | |
745 | dst_free(dst); | |
746 | } | |
747 | ||
1da177e4 LT |
748 | return 0; |
749 | } | |
750 | EXPORT_SYMBOL(xfrm_policy_insert); | |
751 | ||
4e81bb83 MN |
752 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
753 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
754 | struct xfrm_sec_ctx *ctx, int delete, |
755 | int *err) | |
1da177e4 | 756 | { |
2518c7c2 DM |
757 | struct xfrm_policy *pol, *ret; |
758 | struct hlist_head *chain; | |
759 | struct hlist_node *entry; | |
1da177e4 | 760 | |
ef41aaa0 | 761 | *err = 0; |
1da177e4 | 762 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
763 | chain = policy_hash_bysel(sel, sel->family, dir); |
764 | ret = NULL; | |
765 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
766 | if (pol->type == type && | |
767 | !selector_cmp(sel, &pol->selector) && | |
768 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 769 | xfrm_pol_hold(pol); |
2518c7c2 | 770 | if (delete) { |
ef41aaa0 EP |
771 | *err = security_xfrm_policy_delete(pol); |
772 | if (*err) { | |
773 | write_unlock_bh(&xfrm_policy_lock); | |
774 | return pol; | |
775 | } | |
2518c7c2 DM |
776 | hlist_del(&pol->bydst); |
777 | hlist_del(&pol->byidx); | |
778 | xfrm_policy_count[dir]--; | |
779 | } | |
780 | ret = pol; | |
1da177e4 LT |
781 | break; |
782 | } | |
783 | } | |
784 | write_unlock_bh(&xfrm_policy_lock); | |
785 | ||
2518c7c2 | 786 | if (ret && delete) { |
1da177e4 | 787 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 788 | xfrm_policy_kill(ret); |
1da177e4 | 789 | } |
2518c7c2 | 790 | return ret; |
1da177e4 | 791 | } |
df71837d | 792 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 793 | |
ef41aaa0 EP |
794 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
795 | int *err) | |
1da177e4 | 796 | { |
2518c7c2 DM |
797 | struct xfrm_policy *pol, *ret; |
798 | struct hlist_head *chain; | |
799 | struct hlist_node *entry; | |
1da177e4 | 800 | |
b5505c6e HX |
801 | *err = -ENOENT; |
802 | if (xfrm_policy_id2dir(id) != dir) | |
803 | return NULL; | |
804 | ||
ef41aaa0 | 805 | *err = 0; |
1da177e4 | 806 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
807 | chain = xfrm_policy_byidx + idx_hash(id); |
808 | ret = NULL; | |
809 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
810 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 811 | xfrm_pol_hold(pol); |
2518c7c2 | 812 | if (delete) { |
ef41aaa0 EP |
813 | *err = security_xfrm_policy_delete(pol); |
814 | if (*err) { | |
815 | write_unlock_bh(&xfrm_policy_lock); | |
816 | return pol; | |
817 | } | |
2518c7c2 DM |
818 | hlist_del(&pol->bydst); |
819 | hlist_del(&pol->byidx); | |
820 | xfrm_policy_count[dir]--; | |
821 | } | |
822 | ret = pol; | |
1da177e4 LT |
823 | break; |
824 | } | |
825 | } | |
826 | write_unlock_bh(&xfrm_policy_lock); | |
827 | ||
2518c7c2 | 828 | if (ret && delete) { |
1da177e4 | 829 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 830 | xfrm_policy_kill(ret); |
1da177e4 | 831 | } |
2518c7c2 | 832 | return ret; |
1da177e4 LT |
833 | } |
834 | EXPORT_SYMBOL(xfrm_policy_byid); | |
835 | ||
161a09e7 | 836 | void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 837 | { |
1da177e4 LT |
838 | int dir; |
839 | ||
840 | write_lock_bh(&xfrm_policy_lock); | |
841 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
842 | struct xfrm_policy *pol; |
843 | struct hlist_node *entry; | |
ae8c0577 | 844 | int i, killed; |
2518c7c2 | 845 | |
ae8c0577 | 846 | killed = 0; |
2518c7c2 DM |
847 | again1: |
848 | hlist_for_each_entry(pol, entry, | |
849 | &xfrm_policy_inexact[dir], bydst) { | |
850 | if (pol->type != type) | |
851 | continue; | |
852 | hlist_del(&pol->bydst); | |
853 | hlist_del(&pol->byidx); | |
1da177e4 LT |
854 | write_unlock_bh(&xfrm_policy_lock); |
855 | ||
161a09e7 JL |
856 | xfrm_audit_log(audit_info->loginuid, audit_info->secid, |
857 | AUDIT_MAC_IPSEC_DELSPD, 1, pol, NULL); | |
858 | ||
2518c7c2 | 859 | xfrm_policy_kill(pol); |
ae8c0577 | 860 | killed++; |
1da177e4 LT |
861 | |
862 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
863 | goto again1; |
864 | } | |
865 | ||
866 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
867 | again2: | |
868 | hlist_for_each_entry(pol, entry, | |
869 | xfrm_policy_bydst[dir].table + i, | |
870 | bydst) { | |
871 | if (pol->type != type) | |
872 | continue; | |
873 | hlist_del(&pol->bydst); | |
874 | hlist_del(&pol->byidx); | |
875 | write_unlock_bh(&xfrm_policy_lock); | |
876 | ||
161a09e7 JL |
877 | xfrm_audit_log(audit_info->loginuid, |
878 | audit_info->secid, | |
879 | AUDIT_MAC_IPSEC_DELSPD, 1, | |
880 | pol, NULL); | |
881 | ||
2518c7c2 | 882 | xfrm_policy_kill(pol); |
ae8c0577 | 883 | killed++; |
2518c7c2 DM |
884 | |
885 | write_lock_bh(&xfrm_policy_lock); | |
886 | goto again2; | |
887 | } | |
1da177e4 | 888 | } |
2518c7c2 | 889 | |
ae8c0577 | 890 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
891 | } |
892 | atomic_inc(&flow_cache_genid); | |
893 | write_unlock_bh(&xfrm_policy_lock); | |
894 | } | |
895 | EXPORT_SYMBOL(xfrm_policy_flush); | |
896 | ||
4e81bb83 | 897 | int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
898 | void *data) |
899 | { | |
baf5d743 | 900 | struct xfrm_policy *pol, *last = NULL; |
2518c7c2 | 901 | struct hlist_node *entry; |
baf5d743 | 902 | int dir, last_dir = 0, count, error; |
1da177e4 LT |
903 | |
904 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 | 905 | count = 0; |
1da177e4 LT |
906 | |
907 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
908 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
909 | int i; | |
910 | ||
911 | hlist_for_each_entry(pol, entry, | |
912 | &xfrm_policy_inexact[dir], bydst) { | |
913 | if (pol->type != type) | |
914 | continue; | |
baf5d743 JHS |
915 | if (last) { |
916 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
917 | count, data); | |
918 | if (error) | |
919 | goto out; | |
920 | } | |
921 | last = pol; | |
922 | last_dir = dir; | |
923 | count++; | |
1da177e4 | 924 | } |
2518c7c2 DM |
925 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
926 | hlist_for_each_entry(pol, entry, table + i, bydst) { | |
927 | if (pol->type != type) | |
928 | continue; | |
baf5d743 JHS |
929 | if (last) { |
930 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
931 | count, data); | |
932 | if (error) | |
933 | goto out; | |
934 | } | |
935 | last = pol; | |
936 | last_dir = dir; | |
937 | count++; | |
2518c7c2 DM |
938 | } |
939 | } | |
1da177e4 | 940 | } |
baf5d743 JHS |
941 | if (count == 0) { |
942 | error = -ENOENT; | |
943 | goto out; | |
944 | } | |
945 | error = func(last, last_dir % XFRM_POLICY_MAX, 0, data); | |
1da177e4 LT |
946 | out: |
947 | read_unlock_bh(&xfrm_policy_lock); | |
948 | return error; | |
949 | } | |
950 | EXPORT_SYMBOL(xfrm_policy_walk); | |
951 | ||
134b0fc5 JM |
952 | /* |
953 | * Find policy to apply to this flow. | |
954 | * | |
955 | * Returns 0 if policy found, else an -errno. | |
956 | */ | |
2518c7c2 DM |
957 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
958 | u8 type, u16 family, int dir) | |
1da177e4 | 959 | { |
2518c7c2 | 960 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 961 | int match, ret = -ESRCH; |
1da177e4 | 962 | |
2518c7c2 DM |
963 | if (pol->family != family || |
964 | pol->type != type) | |
134b0fc5 | 965 | return ret; |
1da177e4 | 966 | |
2518c7c2 | 967 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 JM |
968 | if (match) |
969 | ret = security_xfrm_policy_lookup(pol, fl->secid, dir); | |
2518c7c2 | 970 | |
134b0fc5 | 971 | return ret; |
2518c7c2 | 972 | } |
1da177e4 | 973 | |
2518c7c2 DM |
974 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
975 | u16 family, u8 dir) | |
976 | { | |
134b0fc5 | 977 | int err; |
2518c7c2 DM |
978 | struct xfrm_policy *pol, *ret; |
979 | xfrm_address_t *daddr, *saddr; | |
980 | struct hlist_node *entry; | |
981 | struct hlist_head *chain; | |
acba48e1 | 982 | u32 priority = ~0U; |
df71837d | 983 | |
2518c7c2 DM |
984 | daddr = xfrm_flowi_daddr(fl, family); |
985 | saddr = xfrm_flowi_saddr(fl, family); | |
986 | if (unlikely(!daddr || !saddr)) | |
987 | return NULL; | |
988 | ||
989 | read_lock_bh(&xfrm_policy_lock); | |
990 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
991 | ret = NULL; | |
992 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
993 | err = xfrm_policy_match(pol, fl, type, family, dir); |
994 | if (err) { | |
995 | if (err == -ESRCH) | |
996 | continue; | |
997 | else { | |
998 | ret = ERR_PTR(err); | |
999 | goto fail; | |
1000 | } | |
1001 | } else { | |
2518c7c2 | 1002 | ret = pol; |
acba48e1 | 1003 | priority = ret->priority; |
2518c7c2 DM |
1004 | break; |
1005 | } | |
1006 | } | |
acba48e1 DM |
1007 | chain = &xfrm_policy_inexact[dir]; |
1008 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
1009 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1010 | if (err) { | |
1011 | if (err == -ESRCH) | |
1012 | continue; | |
1013 | else { | |
1014 | ret = ERR_PTR(err); | |
1015 | goto fail; | |
1016 | } | |
1017 | } else if (pol->priority < priority) { | |
acba48e1 DM |
1018 | ret = pol; |
1019 | break; | |
1da177e4 LT |
1020 | } |
1021 | } | |
acba48e1 DM |
1022 | if (ret) |
1023 | xfrm_pol_hold(ret); | |
134b0fc5 | 1024 | fail: |
1da177e4 | 1025 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 1026 | |
2518c7c2 | 1027 | return ret; |
4e81bb83 MN |
1028 | } |
1029 | ||
134b0fc5 | 1030 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
1031 | void **objp, atomic_t **obj_refp) |
1032 | { | |
1033 | struct xfrm_policy *pol; | |
134b0fc5 | 1034 | int err = 0; |
4e81bb83 MN |
1035 | |
1036 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1037 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
1038 | if (IS_ERR(pol)) { |
1039 | err = PTR_ERR(pol); | |
1040 | pol = NULL; | |
1041 | } | |
1042 | if (pol || err) | |
4e81bb83 MN |
1043 | goto end; |
1044 | #endif | |
1045 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
1046 | if (IS_ERR(pol)) { |
1047 | err = PTR_ERR(pol); | |
1048 | pol = NULL; | |
1049 | } | |
4e81bb83 | 1050 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1051 | end: |
4e81bb83 | 1052 | #endif |
1da177e4 LT |
1053 | if ((*objp = (void *) pol) != NULL) |
1054 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1055 | return err; |
1da177e4 LT |
1056 | } |
1057 | ||
df71837d TJ |
1058 | static inline int policy_to_flow_dir(int dir) |
1059 | { | |
1060 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1061 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1062 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1063 | return dir; | |
1064 | switch (dir) { | |
1065 | default: | |
1066 | case XFRM_POLICY_IN: | |
1067 | return FLOW_DIR_IN; | |
1068 | case XFRM_POLICY_OUT: | |
1069 | return FLOW_DIR_OUT; | |
1070 | case XFRM_POLICY_FWD: | |
1071 | return FLOW_DIR_FWD; | |
3ff50b79 | 1072 | } |
df71837d TJ |
1073 | } |
1074 | ||
e0d1caa7 | 1075 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1076 | { |
1077 | struct xfrm_policy *pol; | |
1078 | ||
1079 | read_lock_bh(&xfrm_policy_lock); | |
1080 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1081 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1082 | sk->sk_family); |
a716c119 | 1083 | int err = 0; |
df71837d | 1084 | |
3bccfbc7 VY |
1085 | if (match) { |
1086 | err = security_xfrm_policy_lookup(pol, fl->secid, | |
1087 | policy_to_flow_dir(dir)); | |
1088 | if (!err) | |
1089 | xfrm_pol_hold(pol); | |
1090 | else if (err == -ESRCH) | |
1091 | pol = NULL; | |
1092 | else | |
1093 | pol = ERR_PTR(err); | |
1094 | } else | |
1da177e4 LT |
1095 | pol = NULL; |
1096 | } | |
1097 | read_unlock_bh(&xfrm_policy_lock); | |
1098 | return pol; | |
1099 | } | |
1100 | ||
1101 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1102 | { | |
2518c7c2 DM |
1103 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1104 | pol->family, dir); | |
4e81bb83 | 1105 | |
2518c7c2 DM |
1106 | hlist_add_head(&pol->bydst, chain); |
1107 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1108 | xfrm_policy_count[dir]++; | |
1da177e4 | 1109 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1110 | |
1111 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1112 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1113 | } |
1114 | ||
1115 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1116 | int dir) | |
1117 | { | |
2518c7c2 DM |
1118 | if (hlist_unhashed(&pol->bydst)) |
1119 | return NULL; | |
1da177e4 | 1120 | |
2518c7c2 DM |
1121 | hlist_del(&pol->bydst); |
1122 | hlist_del(&pol->byidx); | |
1123 | xfrm_policy_count[dir]--; | |
1124 | ||
1125 | return pol; | |
1da177e4 LT |
1126 | } |
1127 | ||
4666faab | 1128 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1129 | { |
1130 | write_lock_bh(&xfrm_policy_lock); | |
1131 | pol = __xfrm_policy_unlink(pol, dir); | |
1132 | write_unlock_bh(&xfrm_policy_lock); | |
1133 | if (pol) { | |
1134 | if (dir < XFRM_POLICY_MAX) | |
1135 | atomic_inc(&flow_cache_genid); | |
1136 | xfrm_policy_kill(pol); | |
4666faab | 1137 | return 0; |
1da177e4 | 1138 | } |
4666faab | 1139 | return -ENOENT; |
1da177e4 | 1140 | } |
a70fcb0b | 1141 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1142 | |
1143 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1144 | { | |
1145 | struct xfrm_policy *old_pol; | |
1146 | ||
4e81bb83 MN |
1147 | #ifdef CONFIG_XFRM_SUB_POLICY |
1148 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1149 | return -EINVAL; | |
1150 | #endif | |
1151 | ||
1da177e4 LT |
1152 | write_lock_bh(&xfrm_policy_lock); |
1153 | old_pol = sk->sk_policy[dir]; | |
1154 | sk->sk_policy[dir] = pol; | |
1155 | if (pol) { | |
9d729f72 | 1156 | pol->curlft.add_time = get_seconds(); |
4e81bb83 | 1157 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1158 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1159 | } | |
1160 | if (old_pol) | |
1161 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1162 | write_unlock_bh(&xfrm_policy_lock); | |
1163 | ||
1164 | if (old_pol) { | |
1165 | xfrm_policy_kill(old_pol); | |
1166 | } | |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1171 | { | |
1172 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1173 | ||
1174 | if (newp) { | |
1175 | newp->selector = old->selector; | |
df71837d TJ |
1176 | if (security_xfrm_policy_clone(old, newp)) { |
1177 | kfree(newp); | |
1178 | return NULL; /* ENOMEM */ | |
1179 | } | |
1da177e4 LT |
1180 | newp->lft = old->lft; |
1181 | newp->curlft = old->curlft; | |
1182 | newp->action = old->action; | |
1183 | newp->flags = old->flags; | |
1184 | newp->xfrm_nr = old->xfrm_nr; | |
1185 | newp->index = old->index; | |
4e81bb83 | 1186 | newp->type = old->type; |
1da177e4 LT |
1187 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1188 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1189 | write_lock_bh(&xfrm_policy_lock); | |
1190 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1191 | write_unlock_bh(&xfrm_policy_lock); | |
1192 | xfrm_pol_put(newp); | |
1193 | } | |
1194 | return newp; | |
1195 | } | |
1196 | ||
1197 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1198 | { | |
1199 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1200 | *p1 = sk->sk_policy[1]; | |
1201 | ||
1202 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1203 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1204 | return -ENOMEM; | |
1205 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1206 | return -ENOMEM; | |
1207 | return 0; | |
1208 | } | |
1209 | ||
a1e59abf PM |
1210 | static int |
1211 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1212 | unsigned short family) | |
1213 | { | |
1214 | int err; | |
1215 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1216 | ||
1217 | if (unlikely(afinfo == NULL)) | |
1218 | return -EINVAL; | |
1219 | err = afinfo->get_saddr(local, remote); | |
1220 | xfrm_policy_put_afinfo(afinfo); | |
1221 | return err; | |
1222 | } | |
1223 | ||
1da177e4 LT |
1224 | /* Resolve list of templates for the flow, given policy. */ |
1225 | ||
1226 | static int | |
4e81bb83 MN |
1227 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1228 | struct xfrm_state **xfrm, | |
1229 | unsigned short family) | |
1da177e4 LT |
1230 | { |
1231 | int nx; | |
1232 | int i, error; | |
1233 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1234 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1235 | xfrm_address_t tmp; |
1da177e4 LT |
1236 | |
1237 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1238 | struct xfrm_state *x; | |
1239 | xfrm_address_t *remote = daddr; | |
1240 | xfrm_address_t *local = saddr; | |
1241 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1242 | ||
7e49e6de | 1243 | if (tmpl->mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
1244 | remote = &tmpl->id.daddr; |
1245 | local = &tmpl->saddr; | |
76b3f055 | 1246 | family = tmpl->encap_family; |
a1e59abf PM |
1247 | if (xfrm_addr_any(local, family)) { |
1248 | error = xfrm_get_saddr(&tmp, remote, family); | |
1249 | if (error) | |
1250 | goto fail; | |
1251 | local = &tmp; | |
1252 | } | |
1da177e4 LT |
1253 | } |
1254 | ||
1255 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1256 | ||
1257 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1258 | xfrm[nx++] = x; | |
1259 | daddr = remote; | |
1260 | saddr = local; | |
1261 | continue; | |
1262 | } | |
1263 | if (x) { | |
1264 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1265 | -EINVAL : -EAGAIN); | |
1266 | xfrm_state_put(x); | |
1267 | } | |
1268 | ||
1269 | if (!tmpl->optional) | |
1270 | goto fail; | |
1271 | } | |
1272 | return nx; | |
1273 | ||
1274 | fail: | |
1275 | for (nx--; nx>=0; nx--) | |
1276 | xfrm_state_put(xfrm[nx]); | |
1277 | return error; | |
1278 | } | |
1279 | ||
4e81bb83 MN |
1280 | static int |
1281 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1282 | struct xfrm_state **xfrm, | |
1283 | unsigned short family) | |
1284 | { | |
41a49cc3 MN |
1285 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1286 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1287 | int cnx = 0; |
1288 | int error; | |
1289 | int ret; | |
1290 | int i; | |
1291 | ||
1292 | for (i = 0; i < npols; i++) { | |
1293 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1294 | error = -ENOBUFS; | |
1295 | goto fail; | |
1296 | } | |
41a49cc3 MN |
1297 | |
1298 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1299 | if (ret < 0) { |
1300 | error = ret; | |
1301 | goto fail; | |
1302 | } else | |
1303 | cnx += ret; | |
1304 | } | |
1305 | ||
41a49cc3 MN |
1306 | /* found states are sorted for outbound processing */ |
1307 | if (npols > 1) | |
1308 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1309 | ||
4e81bb83 MN |
1310 | return cnx; |
1311 | ||
1312 | fail: | |
1313 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1314 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1315 | return error; |
1316 | ||
1317 | } | |
1318 | ||
1da177e4 LT |
1319 | /* Check that the bundle accepts the flow and its components are |
1320 | * still valid. | |
1321 | */ | |
1322 | ||
1323 | static struct dst_entry * | |
1324 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1325 | { | |
1326 | struct dst_entry *x; | |
1327 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1328 | if (unlikely(afinfo == NULL)) | |
1329 | return ERR_PTR(-EINVAL); | |
1330 | x = afinfo->find_bundle(fl, policy); | |
1331 | xfrm_policy_put_afinfo(afinfo); | |
1332 | return x; | |
1333 | } | |
1334 | ||
1335 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate | |
1336 | * all the metrics... Shortly, bundle a bundle. | |
1337 | */ | |
1338 | ||
1339 | static int | |
1340 | xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, | |
1341 | struct flowi *fl, struct dst_entry **dst_p, | |
1342 | unsigned short family) | |
1343 | { | |
1344 | int err; | |
1345 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1346 | if (unlikely(afinfo == NULL)) | |
1347 | return -EINVAL; | |
1348 | err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p); | |
1349 | xfrm_policy_put_afinfo(afinfo); | |
1350 | return err; | |
1351 | } | |
1352 | ||
157bfc25 MN |
1353 | static int inline |
1354 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1355 | { | |
1356 | if (!*target) { | |
1357 | *target = kmalloc(size, GFP_ATOMIC); | |
1358 | if (!*target) | |
1359 | return -ENOMEM; | |
1360 | } | |
1361 | memcpy(*target, src, size); | |
1362 | return 0; | |
1363 | } | |
1364 | ||
1365 | static int inline | |
1366 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1367 | { | |
1368 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1369 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1370 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1371 | sel, sizeof(*sel)); | |
1372 | #else | |
1373 | return 0; | |
1374 | #endif | |
1375 | } | |
1376 | ||
1377 | static int inline | |
1378 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1379 | { | |
1380 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1381 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1382 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1383 | #else | |
1384 | return 0; | |
1385 | #endif | |
1386 | } | |
1da177e4 LT |
1387 | |
1388 | static int stale_bundle(struct dst_entry *dst); | |
1389 | ||
1390 | /* Main function: finds/creates a bundle for given flow. | |
1391 | * | |
1392 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1393 | * on interfaces with disabled IPsec. | |
1394 | */ | |
14e50e57 DM |
1395 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
1396 | struct sock *sk, int flags) | |
1da177e4 LT |
1397 | { |
1398 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1399 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1400 | int npols; | |
1401 | int pol_dead; | |
1402 | int xfrm_nr; | |
1403 | int pi; | |
1da177e4 LT |
1404 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1405 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1406 | int nx = 0; | |
1407 | int err; | |
1408 | u32 genid; | |
42cf93cd | 1409 | u16 family; |
df71837d | 1410 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1411 | |
1da177e4 LT |
1412 | restart: |
1413 | genid = atomic_read(&flow_cache_genid); | |
1414 | policy = NULL; | |
4e81bb83 MN |
1415 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1416 | pols[pi] = NULL; | |
1417 | npols = 0; | |
1418 | pol_dead = 0; | |
1419 | xfrm_nr = 0; | |
1420 | ||
3bccfbc7 | 1421 | if (sk && sk->sk_policy[1]) { |
e0d1caa7 | 1422 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
3bccfbc7 VY |
1423 | if (IS_ERR(policy)) |
1424 | return PTR_ERR(policy); | |
1425 | } | |
1da177e4 LT |
1426 | |
1427 | if (!policy) { | |
1428 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1429 | if ((dst_orig->flags & DST_NOXFRM) || |
1430 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
1da177e4 LT |
1431 | return 0; |
1432 | ||
e0d1caa7 | 1433 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1434 | dir, xfrm_policy_lookup); |
134b0fc5 JM |
1435 | if (IS_ERR(policy)) |
1436 | return PTR_ERR(policy); | |
1da177e4 LT |
1437 | } |
1438 | ||
1439 | if (!policy) | |
1440 | return 0; | |
1441 | ||
42cf93cd | 1442 | family = dst_orig->ops->family; |
9d729f72 | 1443 | policy->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1444 | pols[0] = policy; |
1445 | npols ++; | |
1446 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 LT |
1447 | |
1448 | switch (policy->action) { | |
1449 | case XFRM_POLICY_BLOCK: | |
1450 | /* Prohibit the flow */ | |
e104411b PM |
1451 | err = -EPERM; |
1452 | goto error; | |
1da177e4 LT |
1453 | |
1454 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1455 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1456 | if (policy->xfrm_nr == 0) { |
1457 | /* Flow passes not transformed. */ | |
1458 | xfrm_pol_put(policy); | |
1459 | return 0; | |
1460 | } | |
4e81bb83 | 1461 | #endif |
1da177e4 LT |
1462 | |
1463 | /* Try to find matching bundle. | |
1464 | * | |
1465 | * LATER: help from flow cache. It is optional, this | |
1466 | * is required only for output policy. | |
1467 | */ | |
1468 | dst = xfrm_find_bundle(fl, policy, family); | |
1469 | if (IS_ERR(dst)) { | |
e104411b PM |
1470 | err = PTR_ERR(dst); |
1471 | goto error; | |
1da177e4 LT |
1472 | } |
1473 | ||
1474 | if (dst) | |
1475 | break; | |
1476 | ||
4e81bb83 MN |
1477 | #ifdef CONFIG_XFRM_SUB_POLICY |
1478 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1479 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1480 | fl, family, | |
1481 | XFRM_POLICY_OUT); | |
1482 | if (pols[1]) { | |
134b0fc5 JM |
1483 | if (IS_ERR(pols[1])) { |
1484 | err = PTR_ERR(pols[1]); | |
1485 | goto error; | |
1486 | } | |
4e81bb83 MN |
1487 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
1488 | err = -EPERM; | |
1489 | goto error; | |
1490 | } | |
1491 | npols ++; | |
1492 | xfrm_nr += pols[1]->xfrm_nr; | |
1493 | } | |
1494 | } | |
1495 | ||
1496 | /* | |
1497 | * Because neither flowi nor bundle information knows about | |
1498 | * transformation template size. On more than one policy usage | |
1499 | * we can realize whether all of them is bypass or not after | |
1500 | * they are searched. See above not-transformed bypass | |
1501 | * is surrounded by non-sub policy configuration, too. | |
1502 | */ | |
1503 | if (xfrm_nr == 0) { | |
1504 | /* Flow passes not transformed. */ | |
1505 | xfrm_pols_put(pols, npols); | |
1506 | return 0; | |
1507 | } | |
1508 | ||
1509 | #endif | |
1510 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1511 | |
1512 | if (unlikely(nx<0)) { | |
1513 | err = nx; | |
14e50e57 DM |
1514 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1515 | /* EREMOTE tells the caller to generate | |
1516 | * a one-shot blackhole route. | |
1517 | */ | |
1518 | xfrm_pol_put(policy); | |
1519 | return -EREMOTE; | |
1520 | } | |
1da177e4 LT |
1521 | if (err == -EAGAIN && flags) { |
1522 | DECLARE_WAITQUEUE(wait, current); | |
1523 | ||
1524 | add_wait_queue(&km_waitq, &wait); | |
1525 | set_current_state(TASK_INTERRUPTIBLE); | |
1526 | schedule(); | |
1527 | set_current_state(TASK_RUNNING); | |
1528 | remove_wait_queue(&km_waitq, &wait); | |
1529 | ||
4e81bb83 | 1530 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1531 | |
1532 | if (nx == -EAGAIN && signal_pending(current)) { | |
1533 | err = -ERESTART; | |
1534 | goto error; | |
1535 | } | |
1536 | if (nx == -EAGAIN || | |
1537 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1538 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1539 | goto restart; |
1540 | } | |
1541 | err = nx; | |
1542 | } | |
1543 | if (err < 0) | |
1544 | goto error; | |
1545 | } | |
1546 | if (nx == 0) { | |
1547 | /* Flow passes not transformed. */ | |
4e81bb83 | 1548 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1549 | return 0; |
1550 | } | |
1551 | ||
1552 | dst = dst_orig; | |
1553 | err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family); | |
1554 | ||
1555 | if (unlikely(err)) { | |
1556 | int i; | |
1557 | for (i=0; i<nx; i++) | |
1558 | xfrm_state_put(xfrm[i]); | |
1559 | goto error; | |
1560 | } | |
1561 | ||
4e81bb83 MN |
1562 | for (pi = 0; pi < npols; pi++) { |
1563 | read_lock_bh(&pols[pi]->lock); | |
1564 | pol_dead |= pols[pi]->dead; | |
1565 | read_unlock_bh(&pols[pi]->lock); | |
1566 | } | |
1567 | ||
1da177e4 | 1568 | write_lock_bh(&policy->lock); |
4e81bb83 | 1569 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1570 | /* Wow! While we worked on resolving, this |
1571 | * policy has gone. Retry. It is not paranoia, | |
1572 | * we just cannot enlist new bundle to dead object. | |
1573 | * We can't enlist stable bundles either. | |
1574 | */ | |
1575 | write_unlock_bh(&policy->lock); | |
1da177e4 LT |
1576 | if (dst) |
1577 | dst_free(dst); | |
00de651d HX |
1578 | |
1579 | err = -EHOSTUNREACH; | |
1580 | goto error; | |
1da177e4 | 1581 | } |
157bfc25 MN |
1582 | |
1583 | if (npols > 1) | |
1584 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1585 | else | |
1586 | err = xfrm_dst_update_origin(dst, fl); | |
1587 | if (unlikely(err)) { | |
1588 | write_unlock_bh(&policy->lock); | |
1589 | if (dst) | |
1590 | dst_free(dst); | |
1591 | goto error; | |
1592 | } | |
1593 | ||
1da177e4 LT |
1594 | dst->next = policy->bundles; |
1595 | policy->bundles = dst; | |
1596 | dst_hold(dst); | |
1597 | write_unlock_bh(&policy->lock); | |
1598 | } | |
1599 | *dst_p = dst; | |
1600 | dst_release(dst_orig); | |
a716c119 | 1601 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1602 | return 0; |
1603 | ||
1604 | error: | |
1605 | dst_release(dst_orig); | |
4e81bb83 | 1606 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1607 | *dst_p = NULL; |
1608 | return err; | |
1609 | } | |
14e50e57 DM |
1610 | EXPORT_SYMBOL(__xfrm_lookup); |
1611 | ||
1612 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1613 | struct sock *sk, int flags) | |
1614 | { | |
1615 | int err = __xfrm_lookup(dst_p, fl, sk, flags); | |
1616 | ||
1617 | if (err == -EREMOTE) { | |
1618 | dst_release(*dst_p); | |
1619 | *dst_p = NULL; | |
1620 | err = -EAGAIN; | |
1621 | } | |
1622 | ||
1623 | return err; | |
1624 | } | |
1da177e4 LT |
1625 | EXPORT_SYMBOL(xfrm_lookup); |
1626 | ||
df0ba92a MN |
1627 | static inline int |
1628 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1629 | { | |
1630 | struct xfrm_state *x; | |
1631 | int err; | |
1632 | ||
1633 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1634 | return 0; | |
1635 | x = skb->sp->xvec[idx]; | |
1636 | if (!x->type->reject) | |
1637 | return 0; | |
1638 | xfrm_state_hold(x); | |
1639 | err = x->type->reject(x, skb, fl); | |
1640 | xfrm_state_put(x); | |
1641 | return err; | |
1642 | } | |
1643 | ||
1da177e4 LT |
1644 | /* When skb is transformed back to its "native" form, we have to |
1645 | * check policy restrictions. At the moment we make this in maximally | |
1646 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1647 | * have policy cached at them. | |
1648 | */ | |
1649 | ||
1650 | static inline int | |
a716c119 | 1651 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1652 | unsigned short family) |
1653 | { | |
1654 | if (xfrm_state_kern(x)) | |
928ba416 | 1655 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1656 | return x->id.proto == tmpl->id.proto && |
1657 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1658 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1659 | x->props.mode == tmpl->mode && | |
f3bd4840 MN |
1660 | ((tmpl->aalgos & (1<<x->props.aalgo)) || |
1661 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && | |
7e49e6de MN |
1662 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1663 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1664 | } |
1665 | ||
df0ba92a MN |
1666 | /* |
1667 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1668 | * because of optional transport mode, or next index of the mathced secpath | |
1669 | * state with the template. | |
1670 | * -1 is returned when no matching template is found. | |
1671 | * Otherwise "-2 - errored_index" is returned. | |
1672 | */ | |
1da177e4 LT |
1673 | static inline int |
1674 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1675 | unsigned short family) | |
1676 | { | |
1677 | int idx = start; | |
1678 | ||
1679 | if (tmpl->optional) { | |
7e49e6de | 1680 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1681 | return start; |
1682 | } else | |
1683 | start = -1; | |
1684 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1685 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1686 | return ++idx; |
df0ba92a MN |
1687 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1688 | if (start == -1) | |
1689 | start = -2-idx; | |
1da177e4 | 1690 | break; |
df0ba92a | 1691 | } |
1da177e4 LT |
1692 | } |
1693 | return start; | |
1694 | } | |
1695 | ||
3e3850e9 PM |
1696 | int |
1697 | xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family) | |
1da177e4 LT |
1698 | { |
1699 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1700 | int err; |
1da177e4 LT |
1701 | |
1702 | if (unlikely(afinfo == NULL)) | |
1703 | return -EAFNOSUPPORT; | |
1704 | ||
1705 | afinfo->decode_session(skb, fl); | |
beb8d13b | 1706 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1707 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1708 | return err; |
1da177e4 | 1709 | } |
3e3850e9 | 1710 | EXPORT_SYMBOL(xfrm_decode_session); |
1da177e4 | 1711 | |
df0ba92a | 1712 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1713 | { |
1714 | for (; k < sp->len; k++) { | |
df0ba92a | 1715 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1716 | *idxp = k; |
1da177e4 | 1717 | return 1; |
df0ba92a | 1718 | } |
1da177e4 LT |
1719 | } |
1720 | ||
1721 | return 0; | |
1722 | } | |
1723 | ||
a716c119 | 1724 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1725 | unsigned short family) |
1726 | { | |
1727 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1728 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1729 | int npols = 0; | |
1730 | int xfrm_nr; | |
1731 | int pi; | |
1da177e4 | 1732 | struct flowi fl; |
df71837d | 1733 | u8 fl_dir = policy_to_flow_dir(dir); |
df0ba92a | 1734 | int xerr_idx = -1; |
1da177e4 | 1735 | |
3e3850e9 | 1736 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 | 1737 | return 0; |
eb9c7ebe | 1738 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1739 | |
1740 | /* First, check used SA against their selectors. */ | |
1741 | if (skb->sp) { | |
1742 | int i; | |
1743 | ||
1744 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa HX |
1745 | struct xfrm_state *x = skb->sp->xvec[i]; |
1746 | if (!xfrm_selector_match(&x->sel, &fl, family)) | |
1da177e4 | 1747 | return 0; |
1da177e4 LT |
1748 | } |
1749 | } | |
1750 | ||
1751 | pol = NULL; | |
3bccfbc7 | 1752 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1753 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
3bccfbc7 VY |
1754 | if (IS_ERR(pol)) |
1755 | return 0; | |
1756 | } | |
1da177e4 LT |
1757 | |
1758 | if (!pol) | |
e0d1caa7 | 1759 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1760 | xfrm_policy_lookup); |
1761 | ||
134b0fc5 JM |
1762 | if (IS_ERR(pol)) |
1763 | return 0; | |
1764 | ||
df0ba92a | 1765 | if (!pol) { |
d1d9facf | 1766 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a MN |
1767 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
1768 | return 0; | |
1769 | } | |
1770 | return 1; | |
1771 | } | |
1da177e4 | 1772 | |
9d729f72 | 1773 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1774 | |
4e81bb83 MN |
1775 | pols[0] = pol; |
1776 | npols ++; | |
1777 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1778 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1779 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1780 | &fl, family, | |
1781 | XFRM_POLICY_IN); | |
1782 | if (pols[1]) { | |
134b0fc5 JM |
1783 | if (IS_ERR(pols[1])) |
1784 | return 0; | |
9d729f72 | 1785 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1786 | npols ++; |
1787 | } | |
1788 | } | |
1789 | #endif | |
1790 | ||
1da177e4 LT |
1791 | if (pol->action == XFRM_POLICY_ALLOW) { |
1792 | struct sec_path *sp; | |
1793 | static struct sec_path dummy; | |
4e81bb83 | 1794 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1795 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1796 | struct xfrm_tmpl **tpp = tp; |
1797 | int ti = 0; | |
1da177e4 LT |
1798 | int i, k; |
1799 | ||
1800 | if ((sp = skb->sp) == NULL) | |
1801 | sp = &dummy; | |
1802 | ||
4e81bb83 MN |
1803 | for (pi = 0; pi < npols; pi++) { |
1804 | if (pols[pi] != pol && | |
1805 | pols[pi]->action != XFRM_POLICY_ALLOW) | |
1806 | goto reject; | |
1807 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) | |
1808 | goto reject_error; | |
1809 | for (i = 0; i < pols[pi]->xfrm_nr; i++) | |
1810 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1811 | } | |
1812 | xfrm_nr = ti; | |
41a49cc3 MN |
1813 | if (npols > 1) { |
1814 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
1815 | tpp = stp; | |
1816 | } | |
4e81bb83 | 1817 | |
1da177e4 LT |
1818 | /* For each tunnel xfrm, find the first matching tmpl. |
1819 | * For each tmpl before that, find corresponding xfrm. | |
1820 | * Order is _important_. Later we will implement | |
1821 | * some barriers, but at the moment barriers | |
1822 | * are implied between each two transformations. | |
1823 | */ | |
4e81bb83 MN |
1824 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
1825 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 1826 | if (k < 0) { |
d1d9facf JM |
1827 | if (k < -1) |
1828 | /* "-2 - errored_index" returned */ | |
1829 | xerr_idx = -(2+k); | |
1da177e4 | 1830 | goto reject; |
df0ba92a | 1831 | } |
1da177e4 LT |
1832 | } |
1833 | ||
d1d9facf | 1834 | if (secpath_has_nontransport(sp, k, &xerr_idx)) |
1da177e4 LT |
1835 | goto reject; |
1836 | ||
4e81bb83 | 1837 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1838 | return 1; |
1839 | } | |
1840 | ||
1841 | reject: | |
df0ba92a | 1842 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
1843 | reject_error: |
1844 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
1845 | return 0; |
1846 | } | |
1847 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1848 | ||
1849 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1850 | { | |
1851 | struct flowi fl; | |
1852 | ||
3e3850e9 | 1853 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 LT |
1854 | return 0; |
1855 | ||
1856 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1857 | } | |
1858 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1859 | ||
d49c73c7 DM |
1860 | /* Optimize later using cookies and generation ids. */ |
1861 | ||
1da177e4 LT |
1862 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1863 | { | |
d49c73c7 DM |
1864 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
1865 | * to "-1" to force all XFRM destinations to get validated by | |
1866 | * dst_ops->check on every use. We do this because when a | |
1867 | * normal route referenced by an XFRM dst is obsoleted we do | |
1868 | * not go looking around for all parent referencing XFRM dsts | |
1869 | * so that we can invalidate them. It is just too much work. | |
1870 | * Instead we make the checks here on every use. For example: | |
1871 | * | |
1872 | * XFRM dst A --> IPv4 dst X | |
1873 | * | |
1874 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
1875 | * in this example). If X is marked obsolete, "A" will not | |
1876 | * notice. That's what we are validating here via the | |
1877 | * stale_bundle() check. | |
1878 | * | |
1879 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
1880 | * dst which causes it's ->obsolete field to be set to a | |
1881 | * positive non-zero integer. If an XFRM dst has been pruned | |
1882 | * like this, we want to force a new route lookup. | |
399c180a | 1883 | */ |
d49c73c7 DM |
1884 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
1885 | return dst; | |
1886 | ||
1da177e4 LT |
1887 | return NULL; |
1888 | } | |
1889 | ||
1890 | static int stale_bundle(struct dst_entry *dst) | |
1891 | { | |
5b368e61 | 1892 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
1893 | } |
1894 | ||
aabc9761 | 1895 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 1896 | { |
1da177e4 LT |
1897 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
1898 | dst->dev = &loopback_dev; | |
1899 | dev_hold(&loopback_dev); | |
1900 | dev_put(dev); | |
1901 | } | |
1902 | } | |
aabc9761 | 1903 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
1904 | |
1905 | static void xfrm_link_failure(struct sk_buff *skb) | |
1906 | { | |
1907 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1908 | return; | |
1909 | } | |
1910 | ||
1911 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
1912 | { | |
1913 | if (dst) { | |
1914 | if (dst->obsolete) { | |
1915 | dst_release(dst); | |
1916 | dst = NULL; | |
1917 | } | |
1918 | } | |
1919 | return dst; | |
1920 | } | |
1921 | ||
2518c7c2 DM |
1922 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
1923 | { | |
1924 | struct dst_entry *dst, **dstp; | |
1925 | ||
1926 | write_lock(&pol->lock); | |
1927 | dstp = &pol->bundles; | |
1928 | while ((dst=*dstp) != NULL) { | |
1929 | if (func(dst)) { | |
1930 | *dstp = dst->next; | |
1931 | dst->next = *gc_list_p; | |
1932 | *gc_list_p = dst; | |
1933 | } else { | |
1934 | dstp = &dst->next; | |
1935 | } | |
1936 | } | |
1937 | write_unlock(&pol->lock); | |
1938 | } | |
1939 | ||
1da177e4 LT |
1940 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
1941 | { | |
2518c7c2 DM |
1942 | struct dst_entry *gc_list = NULL; |
1943 | int dir; | |
1da177e4 LT |
1944 | |
1945 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
1946 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
1947 | struct xfrm_policy *pol; | |
1948 | struct hlist_node *entry; | |
1949 | struct hlist_head *table; | |
1950 | int i; | |
4e81bb83 | 1951 | |
2518c7c2 DM |
1952 | hlist_for_each_entry(pol, entry, |
1953 | &xfrm_policy_inexact[dir], bydst) | |
1954 | prune_one_bundle(pol, func, &gc_list); | |
1955 | ||
1956 | table = xfrm_policy_bydst[dir].table; | |
1957 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
1958 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
1959 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
1960 | } |
1961 | } | |
1962 | read_unlock_bh(&xfrm_policy_lock); | |
1963 | ||
1964 | while (gc_list) { | |
2518c7c2 | 1965 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
1966 | gc_list = dst->next; |
1967 | dst_free(dst); | |
1968 | } | |
1969 | } | |
1970 | ||
1971 | static int unused_bundle(struct dst_entry *dst) | |
1972 | { | |
1973 | return !atomic_read(&dst->__refcnt); | |
1974 | } | |
1975 | ||
1976 | static void __xfrm_garbage_collect(void) | |
1977 | { | |
1978 | xfrm_prune_bundles(unused_bundle); | |
1979 | } | |
1980 | ||
1c095399 | 1981 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
1982 | { |
1983 | xfrm_prune_bundles(stale_bundle); | |
1984 | return 0; | |
1985 | } | |
1986 | ||
1987 | void xfrm_init_pmtu(struct dst_entry *dst) | |
1988 | { | |
1989 | do { | |
1990 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1991 | u32 pmtu, route_mtu_cached; | |
1992 | ||
1993 | pmtu = dst_mtu(dst->child); | |
1994 | xdst->child_mtu_cached = pmtu; | |
1995 | ||
1996 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
1997 | ||
1998 | route_mtu_cached = dst_mtu(xdst->route); | |
1999 | xdst->route_mtu_cached = route_mtu_cached; | |
2000 | ||
2001 | if (pmtu > route_mtu_cached) | |
2002 | pmtu = route_mtu_cached; | |
2003 | ||
2004 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2005 | } while ((dst = dst->next)); | |
2006 | } | |
2007 | ||
2008 | EXPORT_SYMBOL(xfrm_init_pmtu); | |
2009 | ||
2010 | /* Check that the bundle accepts the flow and its components are | |
2011 | * still valid. | |
2012 | */ | |
2013 | ||
5b368e61 VY |
2014 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2015 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2016 | { |
2017 | struct dst_entry *dst = &first->u.dst; | |
2018 | struct xfrm_dst *last; | |
2019 | u32 mtu; | |
2020 | ||
92d63dec | 2021 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2022 | (dst->dev && !netif_running(dst->dev))) |
2023 | return 0; | |
157bfc25 MN |
2024 | #ifdef CONFIG_XFRM_SUB_POLICY |
2025 | if (fl) { | |
2026 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2027 | return 0; | |
2028 | if (first->partner && | |
2029 | !xfrm_selector_match(first->partner, fl, family)) | |
2030 | return 0; | |
2031 | } | |
2032 | #endif | |
1da177e4 LT |
2033 | |
2034 | last = NULL; | |
2035 | ||
2036 | do { | |
2037 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2038 | ||
2039 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2040 | return 0; | |
67f83cbf VY |
2041 | if (fl && pol && |
2042 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2043 | return 0; |
1da177e4 LT |
2044 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2045 | return 0; | |
9d4a706d DM |
2046 | if (xdst->genid != dst->xfrm->genid) |
2047 | return 0; | |
e53820de MN |
2048 | |
2049 | if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL && | |
2050 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) | |
2051 | return 0; | |
1da177e4 LT |
2052 | |
2053 | mtu = dst_mtu(dst->child); | |
2054 | if (xdst->child_mtu_cached != mtu) { | |
2055 | last = xdst; | |
2056 | xdst->child_mtu_cached = mtu; | |
2057 | } | |
2058 | ||
92d63dec | 2059 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2060 | return 0; |
2061 | mtu = dst_mtu(xdst->route); | |
2062 | if (xdst->route_mtu_cached != mtu) { | |
2063 | last = xdst; | |
2064 | xdst->route_mtu_cached = mtu; | |
2065 | } | |
2066 | ||
2067 | dst = dst->child; | |
2068 | } while (dst->xfrm); | |
2069 | ||
2070 | if (likely(!last)) | |
2071 | return 1; | |
2072 | ||
2073 | mtu = last->child_mtu_cached; | |
2074 | for (;;) { | |
2075 | dst = &last->u.dst; | |
2076 | ||
2077 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2078 | if (mtu > last->route_mtu_cached) | |
2079 | mtu = last->route_mtu_cached; | |
2080 | dst->metrics[RTAX_MTU-1] = mtu; | |
2081 | ||
2082 | if (last == first) | |
2083 | break; | |
2084 | ||
2085 | last = last->u.next; | |
2086 | last->child_mtu_cached = mtu; | |
2087 | } | |
2088 | ||
2089 | return 1; | |
2090 | } | |
2091 | ||
2092 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2093 | ||
c9204d9c | 2094 | #ifdef CONFIG_AUDITSYSCALL |
161a09e7 JL |
2095 | /* Audit addition and deletion of SAs and ipsec policy */ |
2096 | ||
2097 | void xfrm_audit_log(uid_t auid, u32 sid, int type, int result, | |
2098 | struct xfrm_policy *xp, struct xfrm_state *x) | |
2099 | { | |
2100 | ||
2101 | char *secctx; | |
2102 | u32 secctx_len; | |
2103 | struct xfrm_sec_ctx *sctx = NULL; | |
2104 | struct audit_buffer *audit_buf; | |
2105 | int family; | |
2106 | extern int audit_enabled; | |
2107 | ||
2108 | if (audit_enabled == 0) | |
2109 | return; | |
2110 | ||
13fcfbb0 DM |
2111 | BUG_ON((type == AUDIT_MAC_IPSEC_ADDSA || |
2112 | type == AUDIT_MAC_IPSEC_DELSA) && !x); | |
2113 | BUG_ON((type == AUDIT_MAC_IPSEC_ADDSPD || | |
2114 | type == AUDIT_MAC_IPSEC_DELSPD) && !xp); | |
2115 | ||
161a09e7 JL |
2116 | audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type); |
2117 | if (audit_buf == NULL) | |
13fcfbb0 | 2118 | return; |
161a09e7 JL |
2119 | |
2120 | switch(type) { | |
2121 | case AUDIT_MAC_IPSEC_ADDSA: | |
2122 | audit_log_format(audit_buf, "SAD add: auid=%u", auid); | |
2123 | break; | |
2124 | case AUDIT_MAC_IPSEC_DELSA: | |
2125 | audit_log_format(audit_buf, "SAD delete: auid=%u", auid); | |
2126 | break; | |
2127 | case AUDIT_MAC_IPSEC_ADDSPD: | |
2128 | audit_log_format(audit_buf, "SPD add: auid=%u", auid); | |
2129 | break; | |
2130 | case AUDIT_MAC_IPSEC_DELSPD: | |
2131 | audit_log_format(audit_buf, "SPD delete: auid=%u", auid); | |
2132 | break; | |
2133 | default: | |
2134 | return; | |
2135 | } | |
2136 | ||
2137 | if (sid != 0 && | |
2138 | security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) | |
2139 | audit_log_format(audit_buf, " subj=%s", secctx); | |
2140 | else | |
2141 | audit_log_task_context(audit_buf); | |
2142 | ||
2143 | if (xp) { | |
2144 | family = xp->selector.family; | |
2145 | if (xp->security) | |
2146 | sctx = xp->security; | |
2147 | } else { | |
2148 | family = x->props.family; | |
2149 | if (x->security) | |
2150 | sctx = x->security; | |
2151 | } | |
2152 | ||
2153 | if (sctx) | |
2154 | audit_log_format(audit_buf, | |
2155 | " sec_alg=%u sec_doi=%u sec_obj=%s", | |
2156 | sctx->ctx_alg, sctx->ctx_doi, sctx->ctx_str); | |
2157 | ||
2158 | switch(family) { | |
2159 | case AF_INET: | |
2160 | { | |
2161 | struct in_addr saddr, daddr; | |
2162 | if (xp) { | |
2163 | saddr.s_addr = xp->selector.saddr.a4; | |
2164 | daddr.s_addr = xp->selector.daddr.a4; | |
2165 | } else { | |
2166 | saddr.s_addr = x->props.saddr.a4; | |
2167 | daddr.s_addr = x->id.daddr.a4; | |
2168 | } | |
2169 | audit_log_format(audit_buf, | |
2170 | " src=%u.%u.%u.%u dst=%u.%u.%u.%u", | |
2171 | NIPQUAD(saddr), NIPQUAD(daddr)); | |
2172 | } | |
2173 | break; | |
2174 | case AF_INET6: | |
2175 | { | |
2176 | struct in6_addr saddr6, daddr6; | |
2177 | if (xp) { | |
2178 | memcpy(&saddr6, xp->selector.saddr.a6, | |
2179 | sizeof(struct in6_addr)); | |
2180 | memcpy(&daddr6, xp->selector.daddr.a6, | |
2181 | sizeof(struct in6_addr)); | |
2182 | } else { | |
2183 | memcpy(&saddr6, x->props.saddr.a6, | |
2184 | sizeof(struct in6_addr)); | |
2185 | memcpy(&daddr6, x->id.daddr.a6, | |
2186 | sizeof(struct in6_addr)); | |
2187 | } | |
2188 | audit_log_format(audit_buf, | |
96199558 | 2189 | " src=" NIP6_FMT " dst=" NIP6_FMT, |
161a09e7 JL |
2190 | NIP6(saddr6), NIP6(daddr6)); |
2191 | } | |
2192 | break; | |
2193 | } | |
2194 | ||
2195 | if (x) | |
2196 | audit_log_format(audit_buf, " spi=%lu(0x%lx) protocol=%s", | |
2197 | (unsigned long)ntohl(x->id.spi), | |
2198 | (unsigned long)ntohl(x->id.spi), | |
2199 | x->id.proto == IPPROTO_AH ? "AH" : | |
2200 | (x->id.proto == IPPROTO_ESP ? | |
2201 | "ESP" : "IPCOMP")); | |
2202 | ||
2203 | audit_log_format(audit_buf, " res=%u", result); | |
2204 | audit_log_end(audit_buf); | |
2205 | } | |
2206 | ||
2207 | EXPORT_SYMBOL(xfrm_audit_log); | |
c9204d9c | 2208 | #endif /* CONFIG_AUDITSYSCALL */ |
161a09e7 | 2209 | |
1da177e4 LT |
2210 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2211 | { | |
2212 | int err = 0; | |
2213 | if (unlikely(afinfo == NULL)) | |
2214 | return -EINVAL; | |
2215 | if (unlikely(afinfo->family >= NPROTO)) | |
2216 | return -EAFNOSUPPORT; | |
e959d812 | 2217 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2218 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2219 | err = -ENOBUFS; | |
2220 | else { | |
2221 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2222 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2223 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2224 | if (likely(dst_ops->check == NULL)) | |
2225 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2226 | if (likely(dst_ops->negative_advice == NULL)) |
2227 | dst_ops->negative_advice = xfrm_negative_advice; | |
2228 | if (likely(dst_ops->link_failure == NULL)) | |
2229 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2230 | if (likely(afinfo->garbage_collect == NULL)) |
2231 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2232 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2233 | } | |
e959d812 | 2234 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2235 | return err; |
2236 | } | |
2237 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2238 | ||
2239 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2240 | { | |
2241 | int err = 0; | |
2242 | if (unlikely(afinfo == NULL)) | |
2243 | return -EINVAL; | |
2244 | if (unlikely(afinfo->family >= NPROTO)) | |
2245 | return -EAFNOSUPPORT; | |
e959d812 | 2246 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2247 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2248 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2249 | err = -EINVAL; | |
2250 | else { | |
2251 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2252 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2253 | dst_ops->kmem_cachep = NULL; | |
2254 | dst_ops->check = NULL; | |
1da177e4 LT |
2255 | dst_ops->negative_advice = NULL; |
2256 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2257 | afinfo->garbage_collect = NULL; |
2258 | } | |
2259 | } | |
e959d812 | 2260 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2261 | return err; |
2262 | } | |
2263 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2264 | ||
2265 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2266 | { | |
2267 | struct xfrm_policy_afinfo *afinfo; | |
2268 | if (unlikely(family >= NPROTO)) | |
2269 | return NULL; | |
2270 | read_lock(&xfrm_policy_afinfo_lock); | |
2271 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2272 | if (unlikely(!afinfo)) |
2273 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2274 | return afinfo; |
2275 | } | |
2276 | ||
2277 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2278 | { | |
546be240 HX |
2279 | read_unlock(&xfrm_policy_afinfo_lock); |
2280 | } | |
2281 | ||
2282 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family) | |
2283 | { | |
2284 | struct xfrm_policy_afinfo *afinfo; | |
2285 | if (unlikely(family >= NPROTO)) | |
2286 | return NULL; | |
2287 | write_lock_bh(&xfrm_policy_afinfo_lock); | |
2288 | afinfo = xfrm_policy_afinfo[family]; | |
2289 | if (unlikely(!afinfo)) | |
2290 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
2291 | return afinfo; | |
2292 | } | |
2293 | ||
2294 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2295 | { | |
2296 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2297 | } |
2298 | ||
2299 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
2300 | { | |
2301 | switch (event) { | |
2302 | case NETDEV_DOWN: | |
2303 | xfrm_flush_bundles(); | |
2304 | } | |
2305 | return NOTIFY_DONE; | |
2306 | } | |
2307 | ||
2308 | static struct notifier_block xfrm_dev_notifier = { | |
2309 | xfrm_dev_event, | |
2310 | NULL, | |
2311 | 0 | |
2312 | }; | |
2313 | ||
2314 | static void __init xfrm_policy_init(void) | |
2315 | { | |
2518c7c2 DM |
2316 | unsigned int hmask, sz; |
2317 | int dir; | |
2318 | ||
1da177e4 LT |
2319 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2320 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2321 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
1da177e4 | 2322 | NULL, NULL); |
1da177e4 | 2323 | |
2518c7c2 DM |
2324 | hmask = 8 - 1; |
2325 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2326 | ||
44e36b42 | 2327 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2328 | xfrm_idx_hmask = hmask; |
2329 | if (!xfrm_policy_byidx) | |
2330 | panic("XFRM: failed to allocate byidx hash\n"); | |
2331 | ||
2332 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2333 | struct xfrm_policy_hash *htab; | |
2334 | ||
2335 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2336 | ||
2337 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2338 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2339 | htab->hmask = hmask; |
2340 | if (!htab->table) | |
2341 | panic("XFRM: failed to allocate bydst hash\n"); | |
2342 | } | |
2343 | ||
c4028958 | 2344 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2345 | register_netdevice_notifier(&xfrm_dev_notifier); |
2346 | } | |
2347 | ||
2348 | void __init xfrm_init(void) | |
2349 | { | |
2350 | xfrm_state_init(); | |
2351 | xfrm_policy_init(); | |
2352 | xfrm_input_init(); | |
2353 | } | |
2354 | ||
80c9abaa SS |
2355 | #ifdef CONFIG_XFRM_MIGRATE |
2356 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2357 | struct xfrm_selector *sel_tgt) | |
2358 | { | |
2359 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2360 | if (sel_tgt->family == sel_cmp->family && | |
2361 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2362 | sel_cmp->family) == 0 && |
80c9abaa SS |
2363 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2364 | sel_cmp->family) == 0 && | |
2365 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2366 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2367 | return 1; | |
2368 | } | |
2369 | } else { | |
2370 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2371 | return 1; | |
2372 | } | |
2373 | } | |
2374 | return 0; | |
2375 | } | |
2376 | ||
2377 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2378 | u8 dir, u8 type) | |
2379 | { | |
2380 | struct xfrm_policy *pol, *ret = NULL; | |
2381 | struct hlist_node *entry; | |
2382 | struct hlist_head *chain; | |
2383 | u32 priority = ~0U; | |
2384 | ||
2385 | read_lock_bh(&xfrm_policy_lock); | |
2386 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2387 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2388 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2389 | pol->type == type) { | |
2390 | ret = pol; | |
2391 | priority = ret->priority; | |
2392 | break; | |
2393 | } | |
2394 | } | |
2395 | chain = &xfrm_policy_inexact[dir]; | |
2396 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2397 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2398 | pol->type == type && | |
2399 | pol->priority < priority) { | |
2400 | ret = pol; | |
2401 | break; | |
2402 | } | |
2403 | } | |
2404 | ||
2405 | if (ret) | |
2406 | xfrm_pol_hold(ret); | |
2407 | ||
2408 | read_unlock_bh(&xfrm_policy_lock); | |
2409 | ||
2410 | return ret; | |
2411 | } | |
2412 | ||
2413 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2414 | { | |
2415 | int match = 0; | |
2416 | ||
2417 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2418 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2419 | switch (t->mode) { | |
2420 | case XFRM_MODE_TUNNEL: | |
2421 | case XFRM_MODE_BEET: | |
2422 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2423 | m->old_family) == 0 && | |
2424 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2425 | m->old_family) == 0) { | |
2426 | match = 1; | |
2427 | } | |
2428 | break; | |
2429 | case XFRM_MODE_TRANSPORT: | |
2430 | /* in case of transport mode, template does not store | |
2431 | any IP addresses, hence we just compare mode and | |
2432 | protocol */ | |
2433 | match = 1; | |
2434 | break; | |
2435 | default: | |
2436 | break; | |
2437 | } | |
2438 | } | |
2439 | return match; | |
2440 | } | |
2441 | ||
2442 | /* update endpoint address(es) of template(s) */ | |
2443 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2444 | struct xfrm_migrate *m, int num_migrate) | |
2445 | { | |
2446 | struct xfrm_migrate *mp; | |
2447 | struct dst_entry *dst; | |
2448 | int i, j, n = 0; | |
2449 | ||
2450 | write_lock_bh(&pol->lock); | |
2451 | if (unlikely(pol->dead)) { | |
2452 | /* target policy has been deleted */ | |
2453 | write_unlock_bh(&pol->lock); | |
2454 | return -ENOENT; | |
2455 | } | |
2456 | ||
2457 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2458 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2459 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2460 | continue; | |
2461 | n++; | |
2462 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL) | |
2463 | continue; | |
2464 | /* update endpoints */ | |
2465 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2466 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2467 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2468 | sizeof(pol->xfrm_vec[i].saddr)); | |
2469 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2470 | /* flush bundles */ | |
2471 | while ((dst = pol->bundles) != NULL) { | |
2472 | pol->bundles = dst->next; | |
2473 | dst_free(dst); | |
2474 | } | |
2475 | } | |
2476 | } | |
2477 | ||
2478 | write_unlock_bh(&pol->lock); | |
2479 | ||
2480 | if (!n) | |
2481 | return -ENODATA; | |
2482 | ||
2483 | return 0; | |
2484 | } | |
2485 | ||
2486 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2487 | { | |
2488 | int i, j; | |
2489 | ||
2490 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2491 | return -EINVAL; | |
2492 | ||
2493 | for (i = 0; i < num_migrate; i++) { | |
2494 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2495 | m[i].old_family) == 0) && | |
2496 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2497 | m[i].old_family) == 0)) | |
2498 | return -EINVAL; | |
2499 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2500 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2501 | return -EINVAL; | |
2502 | ||
2503 | /* check if there is any duplicated entry */ | |
2504 | for (j = i + 1; j < num_migrate; j++) { | |
2505 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2506 | sizeof(m[i].old_daddr)) && | |
2507 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2508 | sizeof(m[i].old_saddr)) && | |
2509 | m[i].proto == m[j].proto && | |
2510 | m[i].mode == m[j].mode && | |
2511 | m[i].reqid == m[j].reqid && | |
2512 | m[i].old_family == m[j].old_family) | |
2513 | return -EINVAL; | |
2514 | } | |
2515 | } | |
2516 | ||
2517 | return 0; | |
2518 | } | |
2519 | ||
2520 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
2521 | struct xfrm_migrate *m, int num_migrate) | |
2522 | { | |
2523 | int i, err, nx_cur = 0, nx_new = 0; | |
2524 | struct xfrm_policy *pol = NULL; | |
2525 | struct xfrm_state *x, *xc; | |
2526 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2527 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2528 | struct xfrm_migrate *mp; | |
2529 | ||
2530 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2531 | goto out; | |
2532 | ||
2533 | /* Stage 1 - find policy */ | |
2534 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2535 | err = -ENOENT; | |
2536 | goto out; | |
2537 | } | |
2538 | ||
2539 | /* Stage 2 - find and update state(s) */ | |
2540 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2541 | if ((x = xfrm_migrate_state_find(mp))) { | |
2542 | x_cur[nx_cur] = x; | |
2543 | nx_cur++; | |
2544 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2545 | x_new[nx_new] = xc; | |
2546 | nx_new++; | |
2547 | } else { | |
2548 | err = -ENODATA; | |
2549 | goto restore_state; | |
2550 | } | |
2551 | } | |
2552 | } | |
2553 | ||
2554 | /* Stage 3 - update policy */ | |
2555 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2556 | goto restore_state; | |
2557 | ||
2558 | /* Stage 4 - delete old state(s) */ | |
2559 | if (nx_cur) { | |
2560 | xfrm_states_put(x_cur, nx_cur); | |
2561 | xfrm_states_delete(x_cur, nx_cur); | |
2562 | } | |
2563 | ||
2564 | /* Stage 5 - announce */ | |
2565 | km_migrate(sel, dir, type, m, num_migrate); | |
2566 | ||
2567 | xfrm_pol_put(pol); | |
2568 | ||
2569 | return 0; | |
2570 | out: | |
2571 | return err; | |
2572 | ||
2573 | restore_state: | |
2574 | if (pol) | |
2575 | xfrm_pol_put(pol); | |
2576 | if (nx_cur) | |
2577 | xfrm_states_put(x_cur, nx_cur); | |
2578 | if (nx_new) | |
2579 | xfrm_states_delete(x_new, nx_new); | |
2580 | ||
2581 | return err; | |
2582 | } | |
e610e679 | 2583 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa SS |
2584 | #endif |
2585 |