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> |
aad0e0b9 | 29 | #include <linux/cache.h> |
1da177e4 | 30 | |
44e36b42 DM |
31 | #include "xfrm_hash.h" |
32 | ||
aad0e0b9 | 33 | int sysctl_xfrm_larval_drop __read_mostly; |
14e50e57 | 34 | |
4a3e2f71 AV |
35 | DEFINE_MUTEX(xfrm_cfg_mutex); |
36 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 LT |
37 | |
38 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
39 | ||
2518c7c2 DM |
40 | unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
41 | EXPORT_SYMBOL(xfrm_policy_count); | |
1da177e4 LT |
42 | |
43 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
44 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
45 | ||
e18b890b | 46 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 LT |
47 | |
48 | static struct work_struct xfrm_policy_gc_work; | |
2518c7c2 | 49 | static HLIST_HEAD(xfrm_policy_gc_list); |
1da177e4 LT |
50 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
51 | ||
52 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
53 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
546be240 HX |
54 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family); |
55 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo); | |
1da177e4 | 56 | |
77681021 AM |
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 | ||
1da177e4 LT |
91 | int xfrm_register_type(struct xfrm_type *type, unsigned short family) |
92 | { | |
546be240 HX |
93 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family); |
94 | struct xfrm_type **typemap; | |
1da177e4 LT |
95 | int err = 0; |
96 | ||
97 | if (unlikely(afinfo == NULL)) | |
98 | return -EAFNOSUPPORT; | |
99 | typemap = afinfo->type_map; | |
100 | ||
546be240 HX |
101 | if (likely(typemap[type->proto] == NULL)) |
102 | typemap[type->proto] = type; | |
1da177e4 LT |
103 | else |
104 | err = -EEXIST; | |
546be240 | 105 | xfrm_policy_unlock_afinfo(afinfo); |
1da177e4 LT |
106 | return err; |
107 | } | |
108 | EXPORT_SYMBOL(xfrm_register_type); | |
109 | ||
110 | int xfrm_unregister_type(struct xfrm_type *type, unsigned short family) | |
111 | { | |
546be240 HX |
112 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family); |
113 | struct xfrm_type **typemap; | |
1da177e4 LT |
114 | int err = 0; |
115 | ||
116 | if (unlikely(afinfo == NULL)) | |
117 | return -EAFNOSUPPORT; | |
118 | typemap = afinfo->type_map; | |
119 | ||
546be240 | 120 | if (unlikely(typemap[type->proto] != type)) |
1da177e4 LT |
121 | err = -ENOENT; |
122 | else | |
546be240 HX |
123 | typemap[type->proto] = NULL; |
124 | xfrm_policy_unlock_afinfo(afinfo); | |
1da177e4 LT |
125 | return err; |
126 | } | |
127 | EXPORT_SYMBOL(xfrm_unregister_type); | |
128 | ||
129 | struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) | |
130 | { | |
131 | struct xfrm_policy_afinfo *afinfo; | |
546be240 | 132 | struct xfrm_type **typemap; |
1da177e4 LT |
133 | struct xfrm_type *type; |
134 | int modload_attempted = 0; | |
135 | ||
136 | retry: | |
137 | afinfo = xfrm_policy_get_afinfo(family); | |
138 | if (unlikely(afinfo == NULL)) | |
139 | return NULL; | |
140 | typemap = afinfo->type_map; | |
141 | ||
546be240 | 142 | type = typemap[proto]; |
1da177e4 LT |
143 | if (unlikely(type && !try_module_get(type->owner))) |
144 | type = NULL; | |
1da177e4 LT |
145 | if (!type && !modload_attempted) { |
146 | xfrm_policy_put_afinfo(afinfo); | |
147 | request_module("xfrm-type-%d-%d", | |
148 | (int) family, (int) proto); | |
149 | modload_attempted = 1; | |
150 | goto retry; | |
151 | } | |
152 | ||
153 | xfrm_policy_put_afinfo(afinfo); | |
154 | return type; | |
155 | } | |
1da177e4 | 156 | |
a716c119 | 157 | int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, |
1da177e4 LT |
158 | unsigned short family) |
159 | { | |
160 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
161 | int err = 0; | |
162 | ||
163 | if (unlikely(afinfo == NULL)) | |
164 | return -EAFNOSUPPORT; | |
165 | ||
166 | if (likely(afinfo->dst_lookup != NULL)) | |
167 | err = afinfo->dst_lookup(dst, fl); | |
168 | else | |
169 | err = -EINVAL; | |
170 | xfrm_policy_put_afinfo(afinfo); | |
171 | return err; | |
172 | } | |
173 | EXPORT_SYMBOL(xfrm_dst_lookup); | |
174 | ||
175 | void xfrm_put_type(struct xfrm_type *type) | |
176 | { | |
177 | module_put(type->owner); | |
178 | } | |
179 | ||
b59f45d0 HX |
180 | int xfrm_register_mode(struct xfrm_mode *mode, int family) |
181 | { | |
182 | struct xfrm_policy_afinfo *afinfo; | |
183 | struct xfrm_mode **modemap; | |
184 | int err; | |
185 | ||
186 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
187 | return -EINVAL; | |
188 | ||
189 | afinfo = xfrm_policy_lock_afinfo(family); | |
190 | if (unlikely(afinfo == NULL)) | |
191 | return -EAFNOSUPPORT; | |
192 | ||
193 | err = -EEXIST; | |
194 | modemap = afinfo->mode_map; | |
195 | if (likely(modemap[mode->encap] == NULL)) { | |
196 | modemap[mode->encap] = mode; | |
197 | err = 0; | |
198 | } | |
199 | ||
200 | xfrm_policy_unlock_afinfo(afinfo); | |
201 | return err; | |
202 | } | |
203 | EXPORT_SYMBOL(xfrm_register_mode); | |
204 | ||
205 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
206 | { | |
207 | struct xfrm_policy_afinfo *afinfo; | |
208 | struct xfrm_mode **modemap; | |
209 | int err; | |
210 | ||
211 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
212 | return -EINVAL; | |
213 | ||
214 | afinfo = xfrm_policy_lock_afinfo(family); | |
215 | if (unlikely(afinfo == NULL)) | |
216 | return -EAFNOSUPPORT; | |
217 | ||
218 | err = -ENOENT; | |
219 | modemap = afinfo->mode_map; | |
220 | if (likely(modemap[mode->encap] == mode)) { | |
221 | modemap[mode->encap] = NULL; | |
222 | err = 0; | |
223 | } | |
224 | ||
225 | xfrm_policy_unlock_afinfo(afinfo); | |
226 | return err; | |
227 | } | |
228 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
229 | ||
230 | struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
231 | { | |
232 | struct xfrm_policy_afinfo *afinfo; | |
233 | struct xfrm_mode *mode; | |
234 | int modload_attempted = 0; | |
235 | ||
236 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
237 | return NULL; | |
238 | ||
239 | retry: | |
240 | afinfo = xfrm_policy_get_afinfo(family); | |
241 | if (unlikely(afinfo == NULL)) | |
242 | return NULL; | |
243 | ||
244 | mode = afinfo->mode_map[encap]; | |
245 | if (unlikely(mode && !try_module_get(mode->owner))) | |
246 | mode = NULL; | |
247 | if (!mode && !modload_attempted) { | |
248 | xfrm_policy_put_afinfo(afinfo); | |
249 | request_module("xfrm-mode-%d-%d", family, encap); | |
250 | modload_attempted = 1; | |
251 | goto retry; | |
252 | } | |
253 | ||
254 | xfrm_policy_put_afinfo(afinfo); | |
255 | return mode; | |
256 | } | |
257 | ||
258 | void xfrm_put_mode(struct xfrm_mode *mode) | |
259 | { | |
260 | module_put(mode->owner); | |
261 | } | |
262 | ||
1da177e4 LT |
263 | static inline unsigned long make_jiffies(long secs) |
264 | { | |
265 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
266 | return MAX_SCHEDULE_TIMEOUT-1; | |
267 | else | |
a716c119 | 268 | return secs*HZ; |
1da177e4 LT |
269 | } |
270 | ||
271 | static void xfrm_policy_timer(unsigned long data) | |
272 | { | |
273 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 274 | unsigned long now = get_seconds(); |
1da177e4 LT |
275 | long next = LONG_MAX; |
276 | int warn = 0; | |
277 | int dir; | |
278 | ||
279 | read_lock(&xp->lock); | |
280 | ||
281 | if (xp->dead) | |
282 | goto out; | |
283 | ||
77d8d7a6 | 284 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
285 | |
286 | if (xp->lft.hard_add_expires_seconds) { | |
287 | long tmo = xp->lft.hard_add_expires_seconds + | |
288 | xp->curlft.add_time - now; | |
289 | if (tmo <= 0) | |
290 | goto expired; | |
291 | if (tmo < next) | |
292 | next = tmo; | |
293 | } | |
294 | if (xp->lft.hard_use_expires_seconds) { | |
295 | long tmo = xp->lft.hard_use_expires_seconds + | |
296 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
297 | if (tmo <= 0) | |
298 | goto expired; | |
299 | if (tmo < next) | |
300 | next = tmo; | |
301 | } | |
302 | if (xp->lft.soft_add_expires_seconds) { | |
303 | long tmo = xp->lft.soft_add_expires_seconds + | |
304 | xp->curlft.add_time - now; | |
305 | if (tmo <= 0) { | |
306 | warn = 1; | |
307 | tmo = XFRM_KM_TIMEOUT; | |
308 | } | |
309 | if (tmo < next) | |
310 | next = tmo; | |
311 | } | |
312 | if (xp->lft.soft_use_expires_seconds) { | |
313 | long tmo = xp->lft.soft_use_expires_seconds + | |
314 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
315 | if (tmo <= 0) { | |
316 | warn = 1; | |
317 | tmo = XFRM_KM_TIMEOUT; | |
318 | } | |
319 | if (tmo < next) | |
320 | next = tmo; | |
321 | } | |
322 | ||
323 | if (warn) | |
6c5c8ca7 | 324 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
325 | if (next != LONG_MAX && |
326 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
327 | xfrm_pol_hold(xp); | |
328 | ||
329 | out: | |
330 | read_unlock(&xp->lock); | |
331 | xfrm_pol_put(xp); | |
332 | return; | |
333 | ||
334 | expired: | |
335 | read_unlock(&xp->lock); | |
4666faab | 336 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 337 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
338 | xfrm_pol_put(xp); |
339 | } | |
340 | ||
341 | ||
342 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
343 | * SPD calls. | |
344 | */ | |
345 | ||
dd0fc66f | 346 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
1da177e4 LT |
347 | { |
348 | struct xfrm_policy *policy; | |
349 | ||
0da974f4 | 350 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
351 | |
352 | if (policy) { | |
2518c7c2 DM |
353 | INIT_HLIST_NODE(&policy->bydst); |
354 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 355 | rwlock_init(&policy->lock); |
2518c7c2 | 356 | atomic_set(&policy->refcnt, 1); |
1da177e4 LT |
357 | init_timer(&policy->timer); |
358 | policy->timer.data = (unsigned long)policy; | |
359 | policy->timer.function = xfrm_policy_timer; | |
360 | } | |
361 | return policy; | |
362 | } | |
363 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
364 | ||
365 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
366 | ||
367 | void __xfrm_policy_destroy(struct xfrm_policy *policy) | |
368 | { | |
09a62660 | 369 | BUG_ON(!policy->dead); |
1da177e4 | 370 | |
09a62660 | 371 | BUG_ON(policy->bundles); |
1da177e4 LT |
372 | |
373 | if (del_timer(&policy->timer)) | |
374 | BUG(); | |
375 | ||
df71837d | 376 | security_xfrm_policy_free(policy); |
1da177e4 LT |
377 | kfree(policy); |
378 | } | |
379 | EXPORT_SYMBOL(__xfrm_policy_destroy); | |
380 | ||
381 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
382 | { | |
383 | struct dst_entry *dst; | |
384 | ||
385 | while ((dst = policy->bundles) != NULL) { | |
386 | policy->bundles = dst->next; | |
387 | dst_free(dst); | |
388 | } | |
389 | ||
390 | if (del_timer(&policy->timer)) | |
391 | atomic_dec(&policy->refcnt); | |
392 | ||
393 | if (atomic_read(&policy->refcnt) > 1) | |
394 | flow_cache_flush(); | |
395 | ||
396 | xfrm_pol_put(policy); | |
397 | } | |
398 | ||
c4028958 | 399 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
400 | { |
401 | struct xfrm_policy *policy; | |
2518c7c2 DM |
402 | struct hlist_node *entry, *tmp; |
403 | struct hlist_head gc_list; | |
1da177e4 LT |
404 | |
405 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
406 | gc_list.first = xfrm_policy_gc_list.first; |
407 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
408 | spin_unlock_bh(&xfrm_policy_gc_lock); |
409 | ||
2518c7c2 | 410 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 411 | xfrm_policy_gc_kill(policy); |
1da177e4 LT |
412 | } |
413 | ||
414 | /* Rule must be locked. Release descentant resources, announce | |
415 | * entry dead. The rule must be unlinked from lists to the moment. | |
416 | */ | |
417 | ||
418 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
419 | { | |
420 | int dead; | |
421 | ||
422 | write_lock_bh(&policy->lock); | |
423 | dead = policy->dead; | |
424 | policy->dead = 1; | |
425 | write_unlock_bh(&policy->lock); | |
426 | ||
427 | if (unlikely(dead)) { | |
428 | WARN_ON(1); | |
429 | return; | |
430 | } | |
431 | ||
432 | spin_lock(&xfrm_policy_gc_lock); | |
2518c7c2 | 433 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
1da177e4 LT |
434 | spin_unlock(&xfrm_policy_gc_lock); |
435 | ||
436 | schedule_work(&xfrm_policy_gc_work); | |
437 | } | |
438 | ||
2518c7c2 DM |
439 | struct xfrm_policy_hash { |
440 | struct hlist_head *table; | |
441 | unsigned int hmask; | |
442 | }; | |
443 | ||
444 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
445 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
446 | static struct hlist_head *xfrm_policy_byidx __read_mostly; | |
447 | static unsigned int xfrm_idx_hmask __read_mostly; | |
448 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
449 | ||
2518c7c2 DM |
450 | static inline unsigned int idx_hash(u32 index) |
451 | { | |
452 | return __idx_hash(index, xfrm_idx_hmask); | |
453 | } | |
454 | ||
2518c7c2 DM |
455 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
456 | { | |
457 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
458 | unsigned int hash = __sel_hash(sel, family, hmask); | |
459 | ||
460 | return (hash == hmask + 1 ? | |
461 | &xfrm_policy_inexact[dir] : | |
462 | xfrm_policy_bydst[dir].table + hash); | |
463 | } | |
464 | ||
465 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
466 | { | |
467 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
468 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
469 | ||
470 | return xfrm_policy_bydst[dir].table + hash; | |
471 | } | |
472 | ||
2518c7c2 DM |
473 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
474 | struct hlist_head *ndsttable, | |
475 | unsigned int nhashmask) | |
476 | { | |
477 | struct hlist_node *entry, *tmp; | |
478 | struct xfrm_policy *pol; | |
479 | ||
480 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { | |
481 | unsigned int h; | |
482 | ||
483 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
484 | pol->family, nhashmask); | |
485 | hlist_add_head(&pol->bydst, ndsttable+h); | |
486 | } | |
487 | } | |
488 | ||
489 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
490 | struct hlist_head *nidxtable, | |
491 | unsigned int nhashmask) | |
492 | { | |
493 | struct hlist_node *entry, *tmp; | |
494 | struct xfrm_policy *pol; | |
495 | ||
496 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
497 | unsigned int h; | |
498 | ||
499 | h = __idx_hash(pol->index, nhashmask); | |
500 | hlist_add_head(&pol->byidx, nidxtable+h); | |
501 | } | |
502 | } | |
503 | ||
504 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
505 | { | |
506 | return ((old_hmask + 1) << 1) - 1; | |
507 | } | |
508 | ||
509 | static void xfrm_bydst_resize(int dir) | |
510 | { | |
511 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
512 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
513 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
514 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 515 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
516 | int i; |
517 | ||
518 | if (!ndst) | |
519 | return; | |
520 | ||
521 | write_lock_bh(&xfrm_policy_lock); | |
522 | ||
523 | for (i = hmask; i >= 0; i--) | |
524 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
525 | ||
526 | xfrm_policy_bydst[dir].table = ndst; | |
527 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
528 | ||
529 | write_unlock_bh(&xfrm_policy_lock); | |
530 | ||
44e36b42 | 531 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
532 | } |
533 | ||
534 | static void xfrm_byidx_resize(int total) | |
535 | { | |
536 | unsigned int hmask = xfrm_idx_hmask; | |
537 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
538 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
539 | struct hlist_head *oidx = xfrm_policy_byidx; | |
44e36b42 | 540 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
541 | int i; |
542 | ||
543 | if (!nidx) | |
544 | return; | |
545 | ||
546 | write_lock_bh(&xfrm_policy_lock); | |
547 | ||
548 | for (i = hmask; i >= 0; i--) | |
549 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
550 | ||
551 | xfrm_policy_byidx = nidx; | |
552 | xfrm_idx_hmask = nhashmask; | |
553 | ||
554 | write_unlock_bh(&xfrm_policy_lock); | |
555 | ||
44e36b42 | 556 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
557 | } |
558 | ||
559 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
560 | { | |
561 | unsigned int cnt = xfrm_policy_count[dir]; | |
562 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
563 | ||
564 | if (total) | |
565 | *total += cnt; | |
566 | ||
567 | if ((hmask + 1) < xfrm_policy_hashmax && | |
568 | cnt > hmask) | |
569 | return 1; | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | static inline int xfrm_byidx_should_resize(int total) | |
575 | { | |
576 | unsigned int hmask = xfrm_idx_hmask; | |
577 | ||
578 | if ((hmask + 1) < xfrm_policy_hashmax && | |
579 | total > hmask) | |
580 | return 1; | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
5a6d3416 | 585 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
586 | { |
587 | read_lock_bh(&xfrm_policy_lock); | |
588 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
589 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
590 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
591 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
592 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
593 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
594 | si->spdhcnt = xfrm_idx_hmask; | |
595 | si->spdhmcnt = xfrm_policy_hashmax; | |
596 | read_unlock_bh(&xfrm_policy_lock); | |
597 | } | |
598 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 599 | |
ecfd6b18 | 600 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 601 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
602 | { |
603 | int dir, total; | |
604 | ||
605 | mutex_lock(&hash_resize_mutex); | |
606 | ||
607 | total = 0; | |
608 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
609 | if (xfrm_bydst_should_resize(dir, &total)) | |
610 | xfrm_bydst_resize(dir); | |
611 | } | |
612 | if (xfrm_byidx_should_resize(total)) | |
613 | xfrm_byidx_resize(total); | |
614 | ||
615 | mutex_unlock(&hash_resize_mutex); | |
616 | } | |
617 | ||
c4028958 | 618 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 619 | |
1da177e4 LT |
620 | /* Generate new index... KAME seems to generate them ordered by cost |
621 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
4e81bb83 | 622 | static u32 xfrm_gen_index(u8 type, int dir) |
1da177e4 | 623 | { |
1da177e4 LT |
624 | static u32 idx_generator; |
625 | ||
626 | for (;;) { | |
2518c7c2 DM |
627 | struct hlist_node *entry; |
628 | struct hlist_head *list; | |
629 | struct xfrm_policy *p; | |
630 | u32 idx; | |
631 | int found; | |
632 | ||
1da177e4 LT |
633 | idx = (idx_generator | dir); |
634 | idx_generator += 8; | |
635 | if (idx == 0) | |
636 | idx = 8; | |
2518c7c2 DM |
637 | list = xfrm_policy_byidx + idx_hash(idx); |
638 | found = 0; | |
639 | hlist_for_each_entry(p, entry, list, byidx) { | |
640 | if (p->index == idx) { | |
641 | found = 1; | |
1da177e4 | 642 | break; |
2518c7c2 | 643 | } |
1da177e4 | 644 | } |
2518c7c2 | 645 | if (!found) |
1da177e4 LT |
646 | return idx; |
647 | } | |
648 | } | |
649 | ||
2518c7c2 DM |
650 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
651 | { | |
652 | u32 *p1 = (u32 *) s1; | |
653 | u32 *p2 = (u32 *) s2; | |
654 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
655 | int i; | |
656 | ||
657 | for (i = 0; i < len; i++) { | |
658 | if (p1[i] != p2[i]) | |
659 | return 1; | |
660 | } | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
1da177e4 LT |
665 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
666 | { | |
2518c7c2 DM |
667 | struct xfrm_policy *pol; |
668 | struct xfrm_policy *delpol; | |
669 | struct hlist_head *chain; | |
a6c7ab55 | 670 | struct hlist_node *entry, *newpos; |
9b78a82c | 671 | struct dst_entry *gc_list; |
1da177e4 LT |
672 | |
673 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
674 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
675 | delpol = NULL; | |
676 | newpos = NULL; | |
2518c7c2 | 677 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 678 | if (pol->type == policy->type && |
2518c7c2 | 679 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
680 | xfrm_sec_ctx_match(pol->security, policy->security) && |
681 | !WARN_ON(delpol)) { | |
1da177e4 LT |
682 | if (excl) { |
683 | write_unlock_bh(&xfrm_policy_lock); | |
684 | return -EEXIST; | |
685 | } | |
1da177e4 LT |
686 | delpol = pol; |
687 | if (policy->priority > pol->priority) | |
688 | continue; | |
689 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 690 | newpos = &pol->bydst; |
1da177e4 LT |
691 | continue; |
692 | } | |
1da177e4 LT |
693 | if (delpol) |
694 | break; | |
1da177e4 LT |
695 | } |
696 | if (newpos) | |
2518c7c2 DM |
697 | hlist_add_after(newpos, &policy->bydst); |
698 | else | |
699 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 700 | xfrm_pol_hold(policy); |
2518c7c2 | 701 | xfrm_policy_count[dir]++; |
1da177e4 | 702 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
703 | if (delpol) { |
704 | hlist_del(&delpol->bydst); | |
705 | hlist_del(&delpol->byidx); | |
706 | xfrm_policy_count[dir]--; | |
707 | } | |
4e81bb83 | 708 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 709 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 710 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
711 | policy->curlft.use_time = 0; |
712 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
713 | xfrm_pol_hold(policy); | |
714 | write_unlock_bh(&xfrm_policy_lock); | |
715 | ||
9b78a82c | 716 | if (delpol) |
1da177e4 | 717 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
718 | else if (xfrm_bydst_should_resize(dir, NULL)) |
719 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
720 | |
721 | read_lock_bh(&xfrm_policy_lock); | |
722 | gc_list = NULL; | |
2518c7c2 DM |
723 | entry = &policy->bydst; |
724 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
725 | struct dst_entry *dst; |
726 | ||
727 | write_lock(&policy->lock); | |
728 | dst = policy->bundles; | |
729 | if (dst) { | |
730 | struct dst_entry *tail = dst; | |
731 | while (tail->next) | |
732 | tail = tail->next; | |
733 | tail->next = gc_list; | |
734 | gc_list = dst; | |
735 | ||
736 | policy->bundles = NULL; | |
737 | } | |
738 | write_unlock(&policy->lock); | |
1da177e4 | 739 | } |
9b78a82c DM |
740 | read_unlock_bh(&xfrm_policy_lock); |
741 | ||
742 | while (gc_list) { | |
743 | struct dst_entry *dst = gc_list; | |
744 | ||
745 | gc_list = dst->next; | |
746 | dst_free(dst); | |
747 | } | |
748 | ||
1da177e4 LT |
749 | return 0; |
750 | } | |
751 | EXPORT_SYMBOL(xfrm_policy_insert); | |
752 | ||
4e81bb83 MN |
753 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
754 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
755 | struct xfrm_sec_ctx *ctx, int delete, |
756 | int *err) | |
1da177e4 | 757 | { |
2518c7c2 DM |
758 | struct xfrm_policy *pol, *ret; |
759 | struct hlist_head *chain; | |
760 | struct hlist_node *entry; | |
1da177e4 | 761 | |
ef41aaa0 | 762 | *err = 0; |
1da177e4 | 763 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
764 | chain = policy_hash_bysel(sel, sel->family, dir); |
765 | ret = NULL; | |
766 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
767 | if (pol->type == type && | |
768 | !selector_cmp(sel, &pol->selector) && | |
769 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 770 | xfrm_pol_hold(pol); |
2518c7c2 | 771 | if (delete) { |
ef41aaa0 EP |
772 | *err = security_xfrm_policy_delete(pol); |
773 | if (*err) { | |
774 | write_unlock_bh(&xfrm_policy_lock); | |
775 | return pol; | |
776 | } | |
2518c7c2 DM |
777 | hlist_del(&pol->bydst); |
778 | hlist_del(&pol->byidx); | |
779 | xfrm_policy_count[dir]--; | |
780 | } | |
781 | ret = pol; | |
1da177e4 LT |
782 | break; |
783 | } | |
784 | } | |
785 | write_unlock_bh(&xfrm_policy_lock); | |
786 | ||
2518c7c2 | 787 | if (ret && delete) { |
1da177e4 | 788 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 789 | xfrm_policy_kill(ret); |
1da177e4 | 790 | } |
2518c7c2 | 791 | return ret; |
1da177e4 | 792 | } |
df71837d | 793 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 794 | |
ef41aaa0 EP |
795 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
796 | int *err) | |
1da177e4 | 797 | { |
2518c7c2 DM |
798 | struct xfrm_policy *pol, *ret; |
799 | struct hlist_head *chain; | |
800 | struct hlist_node *entry; | |
1da177e4 | 801 | |
b5505c6e HX |
802 | *err = -ENOENT; |
803 | if (xfrm_policy_id2dir(id) != dir) | |
804 | return NULL; | |
805 | ||
ef41aaa0 | 806 | *err = 0; |
1da177e4 | 807 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
808 | chain = xfrm_policy_byidx + idx_hash(id); |
809 | ret = NULL; | |
810 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
811 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 812 | xfrm_pol_hold(pol); |
2518c7c2 | 813 | if (delete) { |
ef41aaa0 EP |
814 | *err = security_xfrm_policy_delete(pol); |
815 | if (*err) { | |
816 | write_unlock_bh(&xfrm_policy_lock); | |
817 | return pol; | |
818 | } | |
2518c7c2 DM |
819 | hlist_del(&pol->bydst); |
820 | hlist_del(&pol->byidx); | |
821 | xfrm_policy_count[dir]--; | |
822 | } | |
823 | ret = pol; | |
1da177e4 LT |
824 | break; |
825 | } | |
826 | } | |
827 | write_unlock_bh(&xfrm_policy_lock); | |
828 | ||
2518c7c2 | 829 | if (ret && delete) { |
1da177e4 | 830 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 831 | xfrm_policy_kill(ret); |
1da177e4 | 832 | } |
2518c7c2 | 833 | return ret; |
1da177e4 LT |
834 | } |
835 | EXPORT_SYMBOL(xfrm_policy_byid); | |
836 | ||
161a09e7 | 837 | void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 838 | { |
1da177e4 LT |
839 | int dir; |
840 | ||
841 | write_lock_bh(&xfrm_policy_lock); | |
842 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
843 | struct xfrm_policy *pol; |
844 | struct hlist_node *entry; | |
ae8c0577 | 845 | int i, killed; |
2518c7c2 | 846 | |
ae8c0577 | 847 | killed = 0; |
2518c7c2 DM |
848 | again1: |
849 | hlist_for_each_entry(pol, entry, | |
850 | &xfrm_policy_inexact[dir], bydst) { | |
851 | if (pol->type != type) | |
852 | continue; | |
853 | hlist_del(&pol->bydst); | |
854 | hlist_del(&pol->byidx); | |
1da177e4 LT |
855 | write_unlock_bh(&xfrm_policy_lock); |
856 | ||
161a09e7 JL |
857 | xfrm_audit_log(audit_info->loginuid, audit_info->secid, |
858 | AUDIT_MAC_IPSEC_DELSPD, 1, pol, NULL); | |
859 | ||
2518c7c2 | 860 | xfrm_policy_kill(pol); |
ae8c0577 | 861 | killed++; |
1da177e4 LT |
862 | |
863 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
864 | goto again1; |
865 | } | |
866 | ||
867 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
868 | again2: | |
869 | hlist_for_each_entry(pol, entry, | |
870 | xfrm_policy_bydst[dir].table + i, | |
871 | bydst) { | |
872 | if (pol->type != type) | |
873 | continue; | |
874 | hlist_del(&pol->bydst); | |
875 | hlist_del(&pol->byidx); | |
876 | write_unlock_bh(&xfrm_policy_lock); | |
877 | ||
161a09e7 JL |
878 | xfrm_audit_log(audit_info->loginuid, |
879 | audit_info->secid, | |
880 | AUDIT_MAC_IPSEC_DELSPD, 1, | |
881 | pol, NULL); | |
882 | ||
2518c7c2 | 883 | xfrm_policy_kill(pol); |
ae8c0577 | 884 | killed++; |
2518c7c2 DM |
885 | |
886 | write_lock_bh(&xfrm_policy_lock); | |
887 | goto again2; | |
888 | } | |
1da177e4 | 889 | } |
2518c7c2 | 890 | |
ae8c0577 | 891 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
892 | } |
893 | atomic_inc(&flow_cache_genid); | |
894 | write_unlock_bh(&xfrm_policy_lock); | |
895 | } | |
896 | EXPORT_SYMBOL(xfrm_policy_flush); | |
897 | ||
4e81bb83 | 898 | int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
899 | void *data) |
900 | { | |
baf5d743 | 901 | struct xfrm_policy *pol, *last = NULL; |
2518c7c2 | 902 | struct hlist_node *entry; |
baf5d743 | 903 | int dir, last_dir = 0, count, error; |
1da177e4 LT |
904 | |
905 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 | 906 | count = 0; |
1da177e4 LT |
907 | |
908 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
909 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
910 | int i; | |
911 | ||
912 | hlist_for_each_entry(pol, entry, | |
913 | &xfrm_policy_inexact[dir], bydst) { | |
914 | if (pol->type != type) | |
915 | continue; | |
baf5d743 JHS |
916 | if (last) { |
917 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
918 | count, data); | |
919 | if (error) | |
920 | goto out; | |
921 | } | |
922 | last = pol; | |
923 | last_dir = dir; | |
924 | count++; | |
1da177e4 | 925 | } |
2518c7c2 DM |
926 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
927 | hlist_for_each_entry(pol, entry, table + i, bydst) { | |
928 | if (pol->type != type) | |
929 | continue; | |
baf5d743 JHS |
930 | if (last) { |
931 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
932 | count, data); | |
933 | if (error) | |
934 | goto out; | |
935 | } | |
936 | last = pol; | |
937 | last_dir = dir; | |
938 | count++; | |
2518c7c2 DM |
939 | } |
940 | } | |
1da177e4 | 941 | } |
baf5d743 JHS |
942 | if (count == 0) { |
943 | error = -ENOENT; | |
944 | goto out; | |
945 | } | |
946 | error = func(last, last_dir % XFRM_POLICY_MAX, 0, data); | |
1da177e4 LT |
947 | out: |
948 | read_unlock_bh(&xfrm_policy_lock); | |
949 | return error; | |
950 | } | |
951 | EXPORT_SYMBOL(xfrm_policy_walk); | |
952 | ||
134b0fc5 JM |
953 | /* |
954 | * Find policy to apply to this flow. | |
955 | * | |
956 | * Returns 0 if policy found, else an -errno. | |
957 | */ | |
2518c7c2 DM |
958 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
959 | u8 type, u16 family, int dir) | |
1da177e4 | 960 | { |
2518c7c2 | 961 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 962 | int match, ret = -ESRCH; |
1da177e4 | 963 | |
2518c7c2 DM |
964 | if (pol->family != family || |
965 | pol->type != type) | |
134b0fc5 | 966 | return ret; |
1da177e4 | 967 | |
2518c7c2 | 968 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 JM |
969 | if (match) |
970 | ret = security_xfrm_policy_lookup(pol, fl->secid, dir); | |
2518c7c2 | 971 | |
134b0fc5 | 972 | return ret; |
2518c7c2 | 973 | } |
1da177e4 | 974 | |
2518c7c2 DM |
975 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
976 | u16 family, u8 dir) | |
977 | { | |
134b0fc5 | 978 | int err; |
2518c7c2 DM |
979 | struct xfrm_policy *pol, *ret; |
980 | xfrm_address_t *daddr, *saddr; | |
981 | struct hlist_node *entry; | |
982 | struct hlist_head *chain; | |
acba48e1 | 983 | u32 priority = ~0U; |
df71837d | 984 | |
2518c7c2 DM |
985 | daddr = xfrm_flowi_daddr(fl, family); |
986 | saddr = xfrm_flowi_saddr(fl, family); | |
987 | if (unlikely(!daddr || !saddr)) | |
988 | return NULL; | |
989 | ||
990 | read_lock_bh(&xfrm_policy_lock); | |
991 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
992 | ret = NULL; | |
993 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
994 | err = xfrm_policy_match(pol, fl, type, family, dir); |
995 | if (err) { | |
996 | if (err == -ESRCH) | |
997 | continue; | |
998 | else { | |
999 | ret = ERR_PTR(err); | |
1000 | goto fail; | |
1001 | } | |
1002 | } else { | |
2518c7c2 | 1003 | ret = pol; |
acba48e1 | 1004 | priority = ret->priority; |
2518c7c2 DM |
1005 | break; |
1006 | } | |
1007 | } | |
acba48e1 DM |
1008 | chain = &xfrm_policy_inexact[dir]; |
1009 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
1010 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1011 | if (err) { | |
1012 | if (err == -ESRCH) | |
1013 | continue; | |
1014 | else { | |
1015 | ret = ERR_PTR(err); | |
1016 | goto fail; | |
1017 | } | |
1018 | } else if (pol->priority < priority) { | |
acba48e1 DM |
1019 | ret = pol; |
1020 | break; | |
1da177e4 LT |
1021 | } |
1022 | } | |
acba48e1 DM |
1023 | if (ret) |
1024 | xfrm_pol_hold(ret); | |
134b0fc5 | 1025 | fail: |
1da177e4 | 1026 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 1027 | |
2518c7c2 | 1028 | return ret; |
4e81bb83 MN |
1029 | } |
1030 | ||
134b0fc5 | 1031 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
1032 | void **objp, atomic_t **obj_refp) |
1033 | { | |
1034 | struct xfrm_policy *pol; | |
134b0fc5 | 1035 | int err = 0; |
4e81bb83 MN |
1036 | |
1037 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1038 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
1039 | if (IS_ERR(pol)) { |
1040 | err = PTR_ERR(pol); | |
1041 | pol = NULL; | |
1042 | } | |
1043 | if (pol || err) | |
4e81bb83 MN |
1044 | goto end; |
1045 | #endif | |
1046 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
1047 | if (IS_ERR(pol)) { |
1048 | err = PTR_ERR(pol); | |
1049 | pol = NULL; | |
1050 | } | |
4e81bb83 | 1051 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1052 | end: |
4e81bb83 | 1053 | #endif |
1da177e4 LT |
1054 | if ((*objp = (void *) pol) != NULL) |
1055 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1056 | return err; |
1da177e4 LT |
1057 | } |
1058 | ||
df71837d TJ |
1059 | static inline int policy_to_flow_dir(int dir) |
1060 | { | |
1061 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1062 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1063 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1064 | return dir; | |
1065 | switch (dir) { | |
1066 | default: | |
1067 | case XFRM_POLICY_IN: | |
1068 | return FLOW_DIR_IN; | |
1069 | case XFRM_POLICY_OUT: | |
1070 | return FLOW_DIR_OUT; | |
1071 | case XFRM_POLICY_FWD: | |
1072 | return FLOW_DIR_FWD; | |
3ff50b79 | 1073 | } |
df71837d TJ |
1074 | } |
1075 | ||
e0d1caa7 | 1076 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1077 | { |
1078 | struct xfrm_policy *pol; | |
1079 | ||
1080 | read_lock_bh(&xfrm_policy_lock); | |
1081 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1082 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1083 | sk->sk_family); |
a716c119 | 1084 | int err = 0; |
df71837d | 1085 | |
3bccfbc7 VY |
1086 | if (match) { |
1087 | err = security_xfrm_policy_lookup(pol, fl->secid, | |
1088 | policy_to_flow_dir(dir)); | |
1089 | if (!err) | |
1090 | xfrm_pol_hold(pol); | |
1091 | else if (err == -ESRCH) | |
1092 | pol = NULL; | |
1093 | else | |
1094 | pol = ERR_PTR(err); | |
1095 | } else | |
1da177e4 LT |
1096 | pol = NULL; |
1097 | } | |
1098 | read_unlock_bh(&xfrm_policy_lock); | |
1099 | return pol; | |
1100 | } | |
1101 | ||
1102 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1103 | { | |
2518c7c2 DM |
1104 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1105 | pol->family, dir); | |
4e81bb83 | 1106 | |
2518c7c2 DM |
1107 | hlist_add_head(&pol->bydst, chain); |
1108 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1109 | xfrm_policy_count[dir]++; | |
1da177e4 | 1110 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1111 | |
1112 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1113 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1114 | } |
1115 | ||
1116 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1117 | int dir) | |
1118 | { | |
2518c7c2 DM |
1119 | if (hlist_unhashed(&pol->bydst)) |
1120 | return NULL; | |
1da177e4 | 1121 | |
2518c7c2 DM |
1122 | hlist_del(&pol->bydst); |
1123 | hlist_del(&pol->byidx); | |
1124 | xfrm_policy_count[dir]--; | |
1125 | ||
1126 | return pol; | |
1da177e4 LT |
1127 | } |
1128 | ||
4666faab | 1129 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1130 | { |
1131 | write_lock_bh(&xfrm_policy_lock); | |
1132 | pol = __xfrm_policy_unlink(pol, dir); | |
1133 | write_unlock_bh(&xfrm_policy_lock); | |
1134 | if (pol) { | |
1135 | if (dir < XFRM_POLICY_MAX) | |
1136 | atomic_inc(&flow_cache_genid); | |
1137 | xfrm_policy_kill(pol); | |
4666faab | 1138 | return 0; |
1da177e4 | 1139 | } |
4666faab | 1140 | return -ENOENT; |
1da177e4 | 1141 | } |
a70fcb0b | 1142 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1143 | |
1144 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1145 | { | |
1146 | struct xfrm_policy *old_pol; | |
1147 | ||
4e81bb83 MN |
1148 | #ifdef CONFIG_XFRM_SUB_POLICY |
1149 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1150 | return -EINVAL; | |
1151 | #endif | |
1152 | ||
1da177e4 LT |
1153 | write_lock_bh(&xfrm_policy_lock); |
1154 | old_pol = sk->sk_policy[dir]; | |
1155 | sk->sk_policy[dir] = pol; | |
1156 | if (pol) { | |
9d729f72 | 1157 | pol->curlft.add_time = get_seconds(); |
4e81bb83 | 1158 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1159 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1160 | } | |
1161 | if (old_pol) | |
1162 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1163 | write_unlock_bh(&xfrm_policy_lock); | |
1164 | ||
1165 | if (old_pol) { | |
1166 | xfrm_policy_kill(old_pol); | |
1167 | } | |
1168 | return 0; | |
1169 | } | |
1170 | ||
1171 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1172 | { | |
1173 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1174 | ||
1175 | if (newp) { | |
1176 | newp->selector = old->selector; | |
df71837d TJ |
1177 | if (security_xfrm_policy_clone(old, newp)) { |
1178 | kfree(newp); | |
1179 | return NULL; /* ENOMEM */ | |
1180 | } | |
1da177e4 LT |
1181 | newp->lft = old->lft; |
1182 | newp->curlft = old->curlft; | |
1183 | newp->action = old->action; | |
1184 | newp->flags = old->flags; | |
1185 | newp->xfrm_nr = old->xfrm_nr; | |
1186 | newp->index = old->index; | |
4e81bb83 | 1187 | newp->type = old->type; |
1da177e4 LT |
1188 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1189 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1190 | write_lock_bh(&xfrm_policy_lock); | |
1191 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1192 | write_unlock_bh(&xfrm_policy_lock); | |
1193 | xfrm_pol_put(newp); | |
1194 | } | |
1195 | return newp; | |
1196 | } | |
1197 | ||
1198 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1199 | { | |
1200 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1201 | *p1 = sk->sk_policy[1]; | |
1202 | ||
1203 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1204 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1205 | return -ENOMEM; | |
1206 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1207 | return -ENOMEM; | |
1208 | return 0; | |
1209 | } | |
1210 | ||
a1e59abf PM |
1211 | static int |
1212 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1213 | unsigned short family) | |
1214 | { | |
1215 | int err; | |
1216 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1217 | ||
1218 | if (unlikely(afinfo == NULL)) | |
1219 | return -EINVAL; | |
1220 | err = afinfo->get_saddr(local, remote); | |
1221 | xfrm_policy_put_afinfo(afinfo); | |
1222 | return err; | |
1223 | } | |
1224 | ||
1da177e4 LT |
1225 | /* Resolve list of templates for the flow, given policy. */ |
1226 | ||
1227 | static int | |
4e81bb83 MN |
1228 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1229 | struct xfrm_state **xfrm, | |
1230 | unsigned short family) | |
1da177e4 LT |
1231 | { |
1232 | int nx; | |
1233 | int i, error; | |
1234 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1235 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1236 | xfrm_address_t tmp; |
1da177e4 LT |
1237 | |
1238 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1239 | struct xfrm_state *x; | |
1240 | xfrm_address_t *remote = daddr; | |
1241 | xfrm_address_t *local = saddr; | |
1242 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1243 | ||
7e49e6de | 1244 | if (tmpl->mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
1245 | remote = &tmpl->id.daddr; |
1246 | local = &tmpl->saddr; | |
76b3f055 | 1247 | family = tmpl->encap_family; |
a1e59abf PM |
1248 | if (xfrm_addr_any(local, family)) { |
1249 | error = xfrm_get_saddr(&tmp, remote, family); | |
1250 | if (error) | |
1251 | goto fail; | |
1252 | local = &tmp; | |
1253 | } | |
1da177e4 LT |
1254 | } |
1255 | ||
1256 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1257 | ||
1258 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1259 | xfrm[nx++] = x; | |
1260 | daddr = remote; | |
1261 | saddr = local; | |
1262 | continue; | |
1263 | } | |
1264 | if (x) { | |
1265 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1266 | -EINVAL : -EAGAIN); | |
1267 | xfrm_state_put(x); | |
1268 | } | |
1269 | ||
1270 | if (!tmpl->optional) | |
1271 | goto fail; | |
1272 | } | |
1273 | return nx; | |
1274 | ||
1275 | fail: | |
1276 | for (nx--; nx>=0; nx--) | |
1277 | xfrm_state_put(xfrm[nx]); | |
1278 | return error; | |
1279 | } | |
1280 | ||
4e81bb83 MN |
1281 | static int |
1282 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1283 | struct xfrm_state **xfrm, | |
1284 | unsigned short family) | |
1285 | { | |
41a49cc3 MN |
1286 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1287 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1288 | int cnx = 0; |
1289 | int error; | |
1290 | int ret; | |
1291 | int i; | |
1292 | ||
1293 | for (i = 0; i < npols; i++) { | |
1294 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1295 | error = -ENOBUFS; | |
1296 | goto fail; | |
1297 | } | |
41a49cc3 MN |
1298 | |
1299 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1300 | if (ret < 0) { |
1301 | error = ret; | |
1302 | goto fail; | |
1303 | } else | |
1304 | cnx += ret; | |
1305 | } | |
1306 | ||
41a49cc3 MN |
1307 | /* found states are sorted for outbound processing */ |
1308 | if (npols > 1) | |
1309 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1310 | ||
4e81bb83 MN |
1311 | return cnx; |
1312 | ||
1313 | fail: | |
1314 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1315 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1316 | return error; |
1317 | ||
1318 | } | |
1319 | ||
1da177e4 LT |
1320 | /* Check that the bundle accepts the flow and its components are |
1321 | * still valid. | |
1322 | */ | |
1323 | ||
1324 | static struct dst_entry * | |
1325 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1326 | { | |
1327 | struct dst_entry *x; | |
1328 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1329 | if (unlikely(afinfo == NULL)) | |
1330 | return ERR_PTR(-EINVAL); | |
1331 | x = afinfo->find_bundle(fl, policy); | |
1332 | xfrm_policy_put_afinfo(afinfo); | |
1333 | return x; | |
1334 | } | |
1335 | ||
1336 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate | |
1337 | * all the metrics... Shortly, bundle a bundle. | |
1338 | */ | |
1339 | ||
1340 | static int | |
1341 | xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, | |
1342 | struct flowi *fl, struct dst_entry **dst_p, | |
1343 | unsigned short family) | |
1344 | { | |
1345 | int err; | |
1346 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1347 | if (unlikely(afinfo == NULL)) | |
1348 | return -EINVAL; | |
1349 | err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p); | |
1350 | xfrm_policy_put_afinfo(afinfo); | |
1351 | return err; | |
1352 | } | |
1353 | ||
157bfc25 MN |
1354 | static int inline |
1355 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1356 | { | |
1357 | if (!*target) { | |
1358 | *target = kmalloc(size, GFP_ATOMIC); | |
1359 | if (!*target) | |
1360 | return -ENOMEM; | |
1361 | } | |
1362 | memcpy(*target, src, size); | |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | static int inline | |
1367 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1368 | { | |
1369 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1370 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1371 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1372 | sel, sizeof(*sel)); | |
1373 | #else | |
1374 | return 0; | |
1375 | #endif | |
1376 | } | |
1377 | ||
1378 | static int inline | |
1379 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1380 | { | |
1381 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1382 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1383 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1384 | #else | |
1385 | return 0; | |
1386 | #endif | |
1387 | } | |
1da177e4 LT |
1388 | |
1389 | static int stale_bundle(struct dst_entry *dst); | |
1390 | ||
1391 | /* Main function: finds/creates a bundle for given flow. | |
1392 | * | |
1393 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1394 | * on interfaces with disabled IPsec. | |
1395 | */ | |
14e50e57 DM |
1396 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
1397 | struct sock *sk, int flags) | |
1da177e4 LT |
1398 | { |
1399 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1400 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1401 | int npols; | |
1402 | int pol_dead; | |
1403 | int xfrm_nr; | |
1404 | int pi; | |
1da177e4 LT |
1405 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1406 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1407 | int nx = 0; | |
1408 | int err; | |
1409 | u32 genid; | |
42cf93cd | 1410 | u16 family; |
df71837d | 1411 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1412 | |
1da177e4 LT |
1413 | restart: |
1414 | genid = atomic_read(&flow_cache_genid); | |
1415 | policy = NULL; | |
4e81bb83 MN |
1416 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1417 | pols[pi] = NULL; | |
1418 | npols = 0; | |
1419 | pol_dead = 0; | |
1420 | xfrm_nr = 0; | |
1421 | ||
3bccfbc7 | 1422 | if (sk && sk->sk_policy[1]) { |
e0d1caa7 | 1423 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
3bccfbc7 VY |
1424 | if (IS_ERR(policy)) |
1425 | return PTR_ERR(policy); | |
1426 | } | |
1da177e4 LT |
1427 | |
1428 | if (!policy) { | |
1429 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1430 | if ((dst_orig->flags & DST_NOXFRM) || |
1431 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
1da177e4 LT |
1432 | return 0; |
1433 | ||
e0d1caa7 | 1434 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1435 | dir, xfrm_policy_lookup); |
134b0fc5 JM |
1436 | if (IS_ERR(policy)) |
1437 | return PTR_ERR(policy); | |
1da177e4 LT |
1438 | } |
1439 | ||
1440 | if (!policy) | |
1441 | return 0; | |
1442 | ||
42cf93cd | 1443 | family = dst_orig->ops->family; |
9d729f72 | 1444 | policy->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1445 | pols[0] = policy; |
1446 | npols ++; | |
1447 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 LT |
1448 | |
1449 | switch (policy->action) { | |
1450 | case XFRM_POLICY_BLOCK: | |
1451 | /* Prohibit the flow */ | |
e104411b PM |
1452 | err = -EPERM; |
1453 | goto error; | |
1da177e4 LT |
1454 | |
1455 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1456 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1457 | if (policy->xfrm_nr == 0) { |
1458 | /* Flow passes not transformed. */ | |
1459 | xfrm_pol_put(policy); | |
1460 | return 0; | |
1461 | } | |
4e81bb83 | 1462 | #endif |
1da177e4 LT |
1463 | |
1464 | /* Try to find matching bundle. | |
1465 | * | |
1466 | * LATER: help from flow cache. It is optional, this | |
1467 | * is required only for output policy. | |
1468 | */ | |
1469 | dst = xfrm_find_bundle(fl, policy, family); | |
1470 | if (IS_ERR(dst)) { | |
e104411b PM |
1471 | err = PTR_ERR(dst); |
1472 | goto error; | |
1da177e4 LT |
1473 | } |
1474 | ||
1475 | if (dst) | |
1476 | break; | |
1477 | ||
4e81bb83 MN |
1478 | #ifdef CONFIG_XFRM_SUB_POLICY |
1479 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1480 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1481 | fl, family, | |
1482 | XFRM_POLICY_OUT); | |
1483 | if (pols[1]) { | |
134b0fc5 JM |
1484 | if (IS_ERR(pols[1])) { |
1485 | err = PTR_ERR(pols[1]); | |
1486 | goto error; | |
1487 | } | |
4e81bb83 MN |
1488 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
1489 | err = -EPERM; | |
1490 | goto error; | |
1491 | } | |
1492 | npols ++; | |
1493 | xfrm_nr += pols[1]->xfrm_nr; | |
1494 | } | |
1495 | } | |
1496 | ||
1497 | /* | |
1498 | * Because neither flowi nor bundle information knows about | |
1499 | * transformation template size. On more than one policy usage | |
1500 | * we can realize whether all of them is bypass or not after | |
1501 | * they are searched. See above not-transformed bypass | |
1502 | * is surrounded by non-sub policy configuration, too. | |
1503 | */ | |
1504 | if (xfrm_nr == 0) { | |
1505 | /* Flow passes not transformed. */ | |
1506 | xfrm_pols_put(pols, npols); | |
1507 | return 0; | |
1508 | } | |
1509 | ||
1510 | #endif | |
1511 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1512 | |
1513 | if (unlikely(nx<0)) { | |
1514 | err = nx; | |
14e50e57 DM |
1515 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1516 | /* EREMOTE tells the caller to generate | |
1517 | * a one-shot blackhole route. | |
1518 | */ | |
1519 | xfrm_pol_put(policy); | |
1520 | return -EREMOTE; | |
1521 | } | |
1da177e4 LT |
1522 | if (err == -EAGAIN && flags) { |
1523 | DECLARE_WAITQUEUE(wait, current); | |
1524 | ||
1525 | add_wait_queue(&km_waitq, &wait); | |
1526 | set_current_state(TASK_INTERRUPTIBLE); | |
1527 | schedule(); | |
1528 | set_current_state(TASK_RUNNING); | |
1529 | remove_wait_queue(&km_waitq, &wait); | |
1530 | ||
4e81bb83 | 1531 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1532 | |
1533 | if (nx == -EAGAIN && signal_pending(current)) { | |
1534 | err = -ERESTART; | |
1535 | goto error; | |
1536 | } | |
1537 | if (nx == -EAGAIN || | |
1538 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1539 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1540 | goto restart; |
1541 | } | |
1542 | err = nx; | |
1543 | } | |
1544 | if (err < 0) | |
1545 | goto error; | |
1546 | } | |
1547 | if (nx == 0) { | |
1548 | /* Flow passes not transformed. */ | |
4e81bb83 | 1549 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1550 | return 0; |
1551 | } | |
1552 | ||
1553 | dst = dst_orig; | |
1554 | err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family); | |
1555 | ||
1556 | if (unlikely(err)) { | |
1557 | int i; | |
1558 | for (i=0; i<nx; i++) | |
1559 | xfrm_state_put(xfrm[i]); | |
1560 | goto error; | |
1561 | } | |
1562 | ||
4e81bb83 MN |
1563 | for (pi = 0; pi < npols; pi++) { |
1564 | read_lock_bh(&pols[pi]->lock); | |
1565 | pol_dead |= pols[pi]->dead; | |
1566 | read_unlock_bh(&pols[pi]->lock); | |
1567 | } | |
1568 | ||
1da177e4 | 1569 | write_lock_bh(&policy->lock); |
4e81bb83 | 1570 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1571 | /* Wow! While we worked on resolving, this |
1572 | * policy has gone. Retry. It is not paranoia, | |
1573 | * we just cannot enlist new bundle to dead object. | |
1574 | * We can't enlist stable bundles either. | |
1575 | */ | |
1576 | write_unlock_bh(&policy->lock); | |
1da177e4 LT |
1577 | if (dst) |
1578 | dst_free(dst); | |
00de651d HX |
1579 | |
1580 | err = -EHOSTUNREACH; | |
1581 | goto error; | |
1da177e4 | 1582 | } |
157bfc25 MN |
1583 | |
1584 | if (npols > 1) | |
1585 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1586 | else | |
1587 | err = xfrm_dst_update_origin(dst, fl); | |
1588 | if (unlikely(err)) { | |
1589 | write_unlock_bh(&policy->lock); | |
1590 | if (dst) | |
1591 | dst_free(dst); | |
1592 | goto error; | |
1593 | } | |
1594 | ||
1da177e4 LT |
1595 | dst->next = policy->bundles; |
1596 | policy->bundles = dst; | |
1597 | dst_hold(dst); | |
1598 | write_unlock_bh(&policy->lock); | |
1599 | } | |
1600 | *dst_p = dst; | |
1601 | dst_release(dst_orig); | |
a716c119 | 1602 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1603 | return 0; |
1604 | ||
1605 | error: | |
1606 | dst_release(dst_orig); | |
4e81bb83 | 1607 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1608 | *dst_p = NULL; |
1609 | return err; | |
1610 | } | |
14e50e57 DM |
1611 | EXPORT_SYMBOL(__xfrm_lookup); |
1612 | ||
1613 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1614 | struct sock *sk, int flags) | |
1615 | { | |
1616 | int err = __xfrm_lookup(dst_p, fl, sk, flags); | |
1617 | ||
1618 | if (err == -EREMOTE) { | |
1619 | dst_release(*dst_p); | |
1620 | *dst_p = NULL; | |
1621 | err = -EAGAIN; | |
1622 | } | |
1623 | ||
1624 | return err; | |
1625 | } | |
1da177e4 LT |
1626 | EXPORT_SYMBOL(xfrm_lookup); |
1627 | ||
df0ba92a MN |
1628 | static inline int |
1629 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1630 | { | |
1631 | struct xfrm_state *x; | |
1632 | int err; | |
1633 | ||
1634 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1635 | return 0; | |
1636 | x = skb->sp->xvec[idx]; | |
1637 | if (!x->type->reject) | |
1638 | return 0; | |
1639 | xfrm_state_hold(x); | |
1640 | err = x->type->reject(x, skb, fl); | |
1641 | xfrm_state_put(x); | |
1642 | return err; | |
1643 | } | |
1644 | ||
1da177e4 LT |
1645 | /* When skb is transformed back to its "native" form, we have to |
1646 | * check policy restrictions. At the moment we make this in maximally | |
1647 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1648 | * have policy cached at them. | |
1649 | */ | |
1650 | ||
1651 | static inline int | |
a716c119 | 1652 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1653 | unsigned short family) |
1654 | { | |
1655 | if (xfrm_state_kern(x)) | |
928ba416 | 1656 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1657 | return x->id.proto == tmpl->id.proto && |
1658 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1659 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1660 | x->props.mode == tmpl->mode && | |
f3bd4840 MN |
1661 | ((tmpl->aalgos & (1<<x->props.aalgo)) || |
1662 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && | |
7e49e6de MN |
1663 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1664 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1665 | } |
1666 | ||
df0ba92a MN |
1667 | /* |
1668 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1669 | * because of optional transport mode, or next index of the mathced secpath | |
1670 | * state with the template. | |
1671 | * -1 is returned when no matching template is found. | |
1672 | * Otherwise "-2 - errored_index" is returned. | |
1673 | */ | |
1da177e4 LT |
1674 | static inline int |
1675 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1676 | unsigned short family) | |
1677 | { | |
1678 | int idx = start; | |
1679 | ||
1680 | if (tmpl->optional) { | |
7e49e6de | 1681 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1682 | return start; |
1683 | } else | |
1684 | start = -1; | |
1685 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1686 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1687 | return ++idx; |
df0ba92a MN |
1688 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1689 | if (start == -1) | |
1690 | start = -2-idx; | |
1da177e4 | 1691 | break; |
df0ba92a | 1692 | } |
1da177e4 LT |
1693 | } |
1694 | return start; | |
1695 | } | |
1696 | ||
3e3850e9 PM |
1697 | int |
1698 | xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family) | |
1da177e4 LT |
1699 | { |
1700 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1701 | int err; |
1da177e4 LT |
1702 | |
1703 | if (unlikely(afinfo == NULL)) | |
1704 | return -EAFNOSUPPORT; | |
1705 | ||
1706 | afinfo->decode_session(skb, fl); | |
beb8d13b | 1707 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1708 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1709 | return err; |
1da177e4 | 1710 | } |
3e3850e9 | 1711 | EXPORT_SYMBOL(xfrm_decode_session); |
1da177e4 | 1712 | |
df0ba92a | 1713 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1714 | { |
1715 | for (; k < sp->len; k++) { | |
df0ba92a | 1716 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1717 | *idxp = k; |
1da177e4 | 1718 | return 1; |
df0ba92a | 1719 | } |
1da177e4 LT |
1720 | } |
1721 | ||
1722 | return 0; | |
1723 | } | |
1724 | ||
a716c119 | 1725 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1726 | unsigned short family) |
1727 | { | |
1728 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1729 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1730 | int npols = 0; | |
1731 | int xfrm_nr; | |
1732 | int pi; | |
1da177e4 | 1733 | struct flowi fl; |
df71837d | 1734 | u8 fl_dir = policy_to_flow_dir(dir); |
df0ba92a | 1735 | int xerr_idx = -1; |
1da177e4 | 1736 | |
3e3850e9 | 1737 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 | 1738 | return 0; |
eb9c7ebe | 1739 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1740 | |
1741 | /* First, check used SA against their selectors. */ | |
1742 | if (skb->sp) { | |
1743 | int i; | |
1744 | ||
1745 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa HX |
1746 | struct xfrm_state *x = skb->sp->xvec[i]; |
1747 | if (!xfrm_selector_match(&x->sel, &fl, family)) | |
1da177e4 | 1748 | return 0; |
1da177e4 LT |
1749 | } |
1750 | } | |
1751 | ||
1752 | pol = NULL; | |
3bccfbc7 | 1753 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1754 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
3bccfbc7 VY |
1755 | if (IS_ERR(pol)) |
1756 | return 0; | |
1757 | } | |
1da177e4 LT |
1758 | |
1759 | if (!pol) | |
e0d1caa7 | 1760 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1761 | xfrm_policy_lookup); |
1762 | ||
134b0fc5 JM |
1763 | if (IS_ERR(pol)) |
1764 | return 0; | |
1765 | ||
df0ba92a | 1766 | if (!pol) { |
d1d9facf | 1767 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a MN |
1768 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
1769 | return 0; | |
1770 | } | |
1771 | return 1; | |
1772 | } | |
1da177e4 | 1773 | |
9d729f72 | 1774 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1775 | |
4e81bb83 MN |
1776 | pols[0] = pol; |
1777 | npols ++; | |
1778 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1779 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1780 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1781 | &fl, family, | |
1782 | XFRM_POLICY_IN); | |
1783 | if (pols[1]) { | |
134b0fc5 JM |
1784 | if (IS_ERR(pols[1])) |
1785 | return 0; | |
9d729f72 | 1786 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1787 | npols ++; |
1788 | } | |
1789 | } | |
1790 | #endif | |
1791 | ||
1da177e4 LT |
1792 | if (pol->action == XFRM_POLICY_ALLOW) { |
1793 | struct sec_path *sp; | |
1794 | static struct sec_path dummy; | |
4e81bb83 | 1795 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1796 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1797 | struct xfrm_tmpl **tpp = tp; |
1798 | int ti = 0; | |
1da177e4 LT |
1799 | int i, k; |
1800 | ||
1801 | if ((sp = skb->sp) == NULL) | |
1802 | sp = &dummy; | |
1803 | ||
4e81bb83 MN |
1804 | for (pi = 0; pi < npols; pi++) { |
1805 | if (pols[pi] != pol && | |
1806 | pols[pi]->action != XFRM_POLICY_ALLOW) | |
1807 | goto reject; | |
1808 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) | |
1809 | goto reject_error; | |
1810 | for (i = 0; i < pols[pi]->xfrm_nr; i++) | |
1811 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1812 | } | |
1813 | xfrm_nr = ti; | |
41a49cc3 MN |
1814 | if (npols > 1) { |
1815 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
1816 | tpp = stp; | |
1817 | } | |
4e81bb83 | 1818 | |
1da177e4 LT |
1819 | /* For each tunnel xfrm, find the first matching tmpl. |
1820 | * For each tmpl before that, find corresponding xfrm. | |
1821 | * Order is _important_. Later we will implement | |
1822 | * some barriers, but at the moment barriers | |
1823 | * are implied between each two transformations. | |
1824 | */ | |
4e81bb83 MN |
1825 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
1826 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 1827 | if (k < 0) { |
d1d9facf JM |
1828 | if (k < -1) |
1829 | /* "-2 - errored_index" returned */ | |
1830 | xerr_idx = -(2+k); | |
1da177e4 | 1831 | goto reject; |
df0ba92a | 1832 | } |
1da177e4 LT |
1833 | } |
1834 | ||
d1d9facf | 1835 | if (secpath_has_nontransport(sp, k, &xerr_idx)) |
1da177e4 LT |
1836 | goto reject; |
1837 | ||
4e81bb83 | 1838 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1839 | return 1; |
1840 | } | |
1841 | ||
1842 | reject: | |
df0ba92a | 1843 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
1844 | reject_error: |
1845 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
1846 | return 0; |
1847 | } | |
1848 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1849 | ||
1850 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1851 | { | |
1852 | struct flowi fl; | |
1853 | ||
3e3850e9 | 1854 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 LT |
1855 | return 0; |
1856 | ||
1857 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1858 | } | |
1859 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1860 | ||
d49c73c7 DM |
1861 | /* Optimize later using cookies and generation ids. */ |
1862 | ||
1da177e4 LT |
1863 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1864 | { | |
d49c73c7 DM |
1865 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
1866 | * to "-1" to force all XFRM destinations to get validated by | |
1867 | * dst_ops->check on every use. We do this because when a | |
1868 | * normal route referenced by an XFRM dst is obsoleted we do | |
1869 | * not go looking around for all parent referencing XFRM dsts | |
1870 | * so that we can invalidate them. It is just too much work. | |
1871 | * Instead we make the checks here on every use. For example: | |
1872 | * | |
1873 | * XFRM dst A --> IPv4 dst X | |
1874 | * | |
1875 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
1876 | * in this example). If X is marked obsolete, "A" will not | |
1877 | * notice. That's what we are validating here via the | |
1878 | * stale_bundle() check. | |
1879 | * | |
1880 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
1881 | * dst which causes it's ->obsolete field to be set to a | |
1882 | * positive non-zero integer. If an XFRM dst has been pruned | |
1883 | * like this, we want to force a new route lookup. | |
399c180a | 1884 | */ |
d49c73c7 DM |
1885 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
1886 | return dst; | |
1887 | ||
1da177e4 LT |
1888 | return NULL; |
1889 | } | |
1890 | ||
1891 | static int stale_bundle(struct dst_entry *dst) | |
1892 | { | |
5b368e61 | 1893 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
1894 | } |
1895 | ||
aabc9761 | 1896 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 1897 | { |
1da177e4 LT |
1898 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
1899 | dst->dev = &loopback_dev; | |
1900 | dev_hold(&loopback_dev); | |
1901 | dev_put(dev); | |
1902 | } | |
1903 | } | |
aabc9761 | 1904 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
1905 | |
1906 | static void xfrm_link_failure(struct sk_buff *skb) | |
1907 | { | |
1908 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1909 | return; | |
1910 | } | |
1911 | ||
1912 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
1913 | { | |
1914 | if (dst) { | |
1915 | if (dst->obsolete) { | |
1916 | dst_release(dst); | |
1917 | dst = NULL; | |
1918 | } | |
1919 | } | |
1920 | return dst; | |
1921 | } | |
1922 | ||
2518c7c2 DM |
1923 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
1924 | { | |
1925 | struct dst_entry *dst, **dstp; | |
1926 | ||
1927 | write_lock(&pol->lock); | |
1928 | dstp = &pol->bundles; | |
1929 | while ((dst=*dstp) != NULL) { | |
1930 | if (func(dst)) { | |
1931 | *dstp = dst->next; | |
1932 | dst->next = *gc_list_p; | |
1933 | *gc_list_p = dst; | |
1934 | } else { | |
1935 | dstp = &dst->next; | |
1936 | } | |
1937 | } | |
1938 | write_unlock(&pol->lock); | |
1939 | } | |
1940 | ||
1da177e4 LT |
1941 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
1942 | { | |
2518c7c2 DM |
1943 | struct dst_entry *gc_list = NULL; |
1944 | int dir; | |
1da177e4 LT |
1945 | |
1946 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
1947 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
1948 | struct xfrm_policy *pol; | |
1949 | struct hlist_node *entry; | |
1950 | struct hlist_head *table; | |
1951 | int i; | |
4e81bb83 | 1952 | |
2518c7c2 DM |
1953 | hlist_for_each_entry(pol, entry, |
1954 | &xfrm_policy_inexact[dir], bydst) | |
1955 | prune_one_bundle(pol, func, &gc_list); | |
1956 | ||
1957 | table = xfrm_policy_bydst[dir].table; | |
1958 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
1959 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
1960 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
1961 | } |
1962 | } | |
1963 | read_unlock_bh(&xfrm_policy_lock); | |
1964 | ||
1965 | while (gc_list) { | |
2518c7c2 | 1966 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
1967 | gc_list = dst->next; |
1968 | dst_free(dst); | |
1969 | } | |
1970 | } | |
1971 | ||
1972 | static int unused_bundle(struct dst_entry *dst) | |
1973 | { | |
1974 | return !atomic_read(&dst->__refcnt); | |
1975 | } | |
1976 | ||
1977 | static void __xfrm_garbage_collect(void) | |
1978 | { | |
1979 | xfrm_prune_bundles(unused_bundle); | |
1980 | } | |
1981 | ||
1c095399 | 1982 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
1983 | { |
1984 | xfrm_prune_bundles(stale_bundle); | |
1985 | return 0; | |
1986 | } | |
1987 | ||
1988 | void xfrm_init_pmtu(struct dst_entry *dst) | |
1989 | { | |
1990 | do { | |
1991 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1992 | u32 pmtu, route_mtu_cached; | |
1993 | ||
1994 | pmtu = dst_mtu(dst->child); | |
1995 | xdst->child_mtu_cached = pmtu; | |
1996 | ||
1997 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
1998 | ||
1999 | route_mtu_cached = dst_mtu(xdst->route); | |
2000 | xdst->route_mtu_cached = route_mtu_cached; | |
2001 | ||
2002 | if (pmtu > route_mtu_cached) | |
2003 | pmtu = route_mtu_cached; | |
2004 | ||
2005 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2006 | } while ((dst = dst->next)); | |
2007 | } | |
2008 | ||
2009 | EXPORT_SYMBOL(xfrm_init_pmtu); | |
2010 | ||
2011 | /* Check that the bundle accepts the flow and its components are | |
2012 | * still valid. | |
2013 | */ | |
2014 | ||
5b368e61 VY |
2015 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2016 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2017 | { |
2018 | struct dst_entry *dst = &first->u.dst; | |
2019 | struct xfrm_dst *last; | |
2020 | u32 mtu; | |
2021 | ||
92d63dec | 2022 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2023 | (dst->dev && !netif_running(dst->dev))) |
2024 | return 0; | |
157bfc25 MN |
2025 | #ifdef CONFIG_XFRM_SUB_POLICY |
2026 | if (fl) { | |
2027 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2028 | return 0; | |
2029 | if (first->partner && | |
2030 | !xfrm_selector_match(first->partner, fl, family)) | |
2031 | return 0; | |
2032 | } | |
2033 | #endif | |
1da177e4 LT |
2034 | |
2035 | last = NULL; | |
2036 | ||
2037 | do { | |
2038 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2039 | ||
2040 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2041 | return 0; | |
67f83cbf VY |
2042 | if (fl && pol && |
2043 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2044 | return 0; |
1da177e4 LT |
2045 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2046 | return 0; | |
9d4a706d DM |
2047 | if (xdst->genid != dst->xfrm->genid) |
2048 | return 0; | |
e53820de MN |
2049 | |
2050 | if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL && | |
2051 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) | |
2052 | return 0; | |
1da177e4 LT |
2053 | |
2054 | mtu = dst_mtu(dst->child); | |
2055 | if (xdst->child_mtu_cached != mtu) { | |
2056 | last = xdst; | |
2057 | xdst->child_mtu_cached = mtu; | |
2058 | } | |
2059 | ||
92d63dec | 2060 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2061 | return 0; |
2062 | mtu = dst_mtu(xdst->route); | |
2063 | if (xdst->route_mtu_cached != mtu) { | |
2064 | last = xdst; | |
2065 | xdst->route_mtu_cached = mtu; | |
2066 | } | |
2067 | ||
2068 | dst = dst->child; | |
2069 | } while (dst->xfrm); | |
2070 | ||
2071 | if (likely(!last)) | |
2072 | return 1; | |
2073 | ||
2074 | mtu = last->child_mtu_cached; | |
2075 | for (;;) { | |
2076 | dst = &last->u.dst; | |
2077 | ||
2078 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2079 | if (mtu > last->route_mtu_cached) | |
2080 | mtu = last->route_mtu_cached; | |
2081 | dst->metrics[RTAX_MTU-1] = mtu; | |
2082 | ||
2083 | if (last == first) | |
2084 | break; | |
2085 | ||
2086 | last = last->u.next; | |
2087 | last->child_mtu_cached = mtu; | |
2088 | } | |
2089 | ||
2090 | return 1; | |
2091 | } | |
2092 | ||
2093 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2094 | ||
c9204d9c | 2095 | #ifdef CONFIG_AUDITSYSCALL |
161a09e7 JL |
2096 | /* Audit addition and deletion of SAs and ipsec policy */ |
2097 | ||
2098 | void xfrm_audit_log(uid_t auid, u32 sid, int type, int result, | |
2099 | struct xfrm_policy *xp, struct xfrm_state *x) | |
2100 | { | |
2101 | ||
2102 | char *secctx; | |
2103 | u32 secctx_len; | |
2104 | struct xfrm_sec_ctx *sctx = NULL; | |
2105 | struct audit_buffer *audit_buf; | |
2106 | int family; | |
2107 | extern int audit_enabled; | |
2108 | ||
2109 | if (audit_enabled == 0) | |
2110 | return; | |
2111 | ||
13fcfbb0 DM |
2112 | BUG_ON((type == AUDIT_MAC_IPSEC_ADDSA || |
2113 | type == AUDIT_MAC_IPSEC_DELSA) && !x); | |
2114 | BUG_ON((type == AUDIT_MAC_IPSEC_ADDSPD || | |
2115 | type == AUDIT_MAC_IPSEC_DELSPD) && !xp); | |
2116 | ||
161a09e7 JL |
2117 | audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type); |
2118 | if (audit_buf == NULL) | |
13fcfbb0 | 2119 | return; |
161a09e7 JL |
2120 | |
2121 | switch(type) { | |
2122 | case AUDIT_MAC_IPSEC_ADDSA: | |
2123 | audit_log_format(audit_buf, "SAD add: auid=%u", auid); | |
2124 | break; | |
2125 | case AUDIT_MAC_IPSEC_DELSA: | |
2126 | audit_log_format(audit_buf, "SAD delete: auid=%u", auid); | |
2127 | break; | |
2128 | case AUDIT_MAC_IPSEC_ADDSPD: | |
2129 | audit_log_format(audit_buf, "SPD add: auid=%u", auid); | |
2130 | break; | |
2131 | case AUDIT_MAC_IPSEC_DELSPD: | |
2132 | audit_log_format(audit_buf, "SPD delete: auid=%u", auid); | |
2133 | break; | |
2134 | default: | |
2135 | return; | |
2136 | } | |
2137 | ||
2138 | if (sid != 0 && | |
2139 | security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) | |
2140 | audit_log_format(audit_buf, " subj=%s", secctx); | |
2141 | else | |
2142 | audit_log_task_context(audit_buf); | |
2143 | ||
2144 | if (xp) { | |
2145 | family = xp->selector.family; | |
2146 | if (xp->security) | |
2147 | sctx = xp->security; | |
2148 | } else { | |
2149 | family = x->props.family; | |
2150 | if (x->security) | |
2151 | sctx = x->security; | |
2152 | } | |
2153 | ||
2154 | if (sctx) | |
2155 | audit_log_format(audit_buf, | |
2156 | " sec_alg=%u sec_doi=%u sec_obj=%s", | |
2157 | sctx->ctx_alg, sctx->ctx_doi, sctx->ctx_str); | |
2158 | ||
2159 | switch(family) { | |
2160 | case AF_INET: | |
2161 | { | |
2162 | struct in_addr saddr, daddr; | |
2163 | if (xp) { | |
2164 | saddr.s_addr = xp->selector.saddr.a4; | |
2165 | daddr.s_addr = xp->selector.daddr.a4; | |
2166 | } else { | |
2167 | saddr.s_addr = x->props.saddr.a4; | |
2168 | daddr.s_addr = x->id.daddr.a4; | |
2169 | } | |
2170 | audit_log_format(audit_buf, | |
2171 | " src=%u.%u.%u.%u dst=%u.%u.%u.%u", | |
2172 | NIPQUAD(saddr), NIPQUAD(daddr)); | |
2173 | } | |
2174 | break; | |
2175 | case AF_INET6: | |
2176 | { | |
2177 | struct in6_addr saddr6, daddr6; | |
2178 | if (xp) { | |
2179 | memcpy(&saddr6, xp->selector.saddr.a6, | |
2180 | sizeof(struct in6_addr)); | |
2181 | memcpy(&daddr6, xp->selector.daddr.a6, | |
2182 | sizeof(struct in6_addr)); | |
2183 | } else { | |
2184 | memcpy(&saddr6, x->props.saddr.a6, | |
2185 | sizeof(struct in6_addr)); | |
2186 | memcpy(&daddr6, x->id.daddr.a6, | |
2187 | sizeof(struct in6_addr)); | |
2188 | } | |
2189 | audit_log_format(audit_buf, | |
96199558 | 2190 | " src=" NIP6_FMT " dst=" NIP6_FMT, |
161a09e7 JL |
2191 | NIP6(saddr6), NIP6(daddr6)); |
2192 | } | |
2193 | break; | |
2194 | } | |
2195 | ||
2196 | if (x) | |
2197 | audit_log_format(audit_buf, " spi=%lu(0x%lx) protocol=%s", | |
2198 | (unsigned long)ntohl(x->id.spi), | |
2199 | (unsigned long)ntohl(x->id.spi), | |
2200 | x->id.proto == IPPROTO_AH ? "AH" : | |
2201 | (x->id.proto == IPPROTO_ESP ? | |
2202 | "ESP" : "IPCOMP")); | |
2203 | ||
2204 | audit_log_format(audit_buf, " res=%u", result); | |
2205 | audit_log_end(audit_buf); | |
2206 | } | |
2207 | ||
2208 | EXPORT_SYMBOL(xfrm_audit_log); | |
c9204d9c | 2209 | #endif /* CONFIG_AUDITSYSCALL */ |
161a09e7 | 2210 | |
1da177e4 LT |
2211 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2212 | { | |
2213 | int err = 0; | |
2214 | if (unlikely(afinfo == NULL)) | |
2215 | return -EINVAL; | |
2216 | if (unlikely(afinfo->family >= NPROTO)) | |
2217 | return -EAFNOSUPPORT; | |
e959d812 | 2218 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2219 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2220 | err = -ENOBUFS; | |
2221 | else { | |
2222 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2223 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2224 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2225 | if (likely(dst_ops->check == NULL)) | |
2226 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2227 | if (likely(dst_ops->negative_advice == NULL)) |
2228 | dst_ops->negative_advice = xfrm_negative_advice; | |
2229 | if (likely(dst_ops->link_failure == NULL)) | |
2230 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2231 | if (likely(afinfo->garbage_collect == NULL)) |
2232 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2233 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2234 | } | |
e959d812 | 2235 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2236 | return err; |
2237 | } | |
2238 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2239 | ||
2240 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2241 | { | |
2242 | int err = 0; | |
2243 | if (unlikely(afinfo == NULL)) | |
2244 | return -EINVAL; | |
2245 | if (unlikely(afinfo->family >= NPROTO)) | |
2246 | return -EAFNOSUPPORT; | |
e959d812 | 2247 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2248 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2249 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2250 | err = -EINVAL; | |
2251 | else { | |
2252 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2253 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2254 | dst_ops->kmem_cachep = NULL; | |
2255 | dst_ops->check = NULL; | |
1da177e4 LT |
2256 | dst_ops->negative_advice = NULL; |
2257 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2258 | afinfo->garbage_collect = NULL; |
2259 | } | |
2260 | } | |
e959d812 | 2261 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2262 | return err; |
2263 | } | |
2264 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2265 | ||
2266 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2267 | { | |
2268 | struct xfrm_policy_afinfo *afinfo; | |
2269 | if (unlikely(family >= NPROTO)) | |
2270 | return NULL; | |
2271 | read_lock(&xfrm_policy_afinfo_lock); | |
2272 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2273 | if (unlikely(!afinfo)) |
2274 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2275 | return afinfo; |
2276 | } | |
2277 | ||
2278 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2279 | { | |
546be240 HX |
2280 | read_unlock(&xfrm_policy_afinfo_lock); |
2281 | } | |
2282 | ||
2283 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family) | |
2284 | { | |
2285 | struct xfrm_policy_afinfo *afinfo; | |
2286 | if (unlikely(family >= NPROTO)) | |
2287 | return NULL; | |
2288 | write_lock_bh(&xfrm_policy_afinfo_lock); | |
2289 | afinfo = xfrm_policy_afinfo[family]; | |
2290 | if (unlikely(!afinfo)) | |
2291 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
2292 | return afinfo; | |
2293 | } | |
2294 | ||
2295 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2296 | { | |
2297 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2298 | } |
2299 | ||
2300 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
2301 | { | |
2302 | switch (event) { | |
2303 | case NETDEV_DOWN: | |
2304 | xfrm_flush_bundles(); | |
2305 | } | |
2306 | return NOTIFY_DONE; | |
2307 | } | |
2308 | ||
2309 | static struct notifier_block xfrm_dev_notifier = { | |
2310 | xfrm_dev_event, | |
2311 | NULL, | |
2312 | 0 | |
2313 | }; | |
2314 | ||
2315 | static void __init xfrm_policy_init(void) | |
2316 | { | |
2518c7c2 DM |
2317 | unsigned int hmask, sz; |
2318 | int dir; | |
2319 | ||
1da177e4 LT |
2320 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2321 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2322 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
1da177e4 | 2323 | NULL, NULL); |
1da177e4 | 2324 | |
2518c7c2 DM |
2325 | hmask = 8 - 1; |
2326 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2327 | ||
44e36b42 | 2328 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2329 | xfrm_idx_hmask = hmask; |
2330 | if (!xfrm_policy_byidx) | |
2331 | panic("XFRM: failed to allocate byidx hash\n"); | |
2332 | ||
2333 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2334 | struct xfrm_policy_hash *htab; | |
2335 | ||
2336 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2337 | ||
2338 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2339 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2340 | htab->hmask = hmask; |
2341 | if (!htab->table) | |
2342 | panic("XFRM: failed to allocate bydst hash\n"); | |
2343 | } | |
2344 | ||
c4028958 | 2345 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2346 | register_netdevice_notifier(&xfrm_dev_notifier); |
2347 | } | |
2348 | ||
2349 | void __init xfrm_init(void) | |
2350 | { | |
2351 | xfrm_state_init(); | |
2352 | xfrm_policy_init(); | |
2353 | xfrm_input_init(); | |
2354 | } | |
2355 | ||
80c9abaa SS |
2356 | #ifdef CONFIG_XFRM_MIGRATE |
2357 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2358 | struct xfrm_selector *sel_tgt) | |
2359 | { | |
2360 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2361 | if (sel_tgt->family == sel_cmp->family && | |
2362 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2363 | sel_cmp->family) == 0 && |
80c9abaa SS |
2364 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2365 | sel_cmp->family) == 0 && | |
2366 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2367 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2368 | return 1; | |
2369 | } | |
2370 | } else { | |
2371 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2372 | return 1; | |
2373 | } | |
2374 | } | |
2375 | return 0; | |
2376 | } | |
2377 | ||
2378 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2379 | u8 dir, u8 type) | |
2380 | { | |
2381 | struct xfrm_policy *pol, *ret = NULL; | |
2382 | struct hlist_node *entry; | |
2383 | struct hlist_head *chain; | |
2384 | u32 priority = ~0U; | |
2385 | ||
2386 | read_lock_bh(&xfrm_policy_lock); | |
2387 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2388 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2389 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2390 | pol->type == type) { | |
2391 | ret = pol; | |
2392 | priority = ret->priority; | |
2393 | break; | |
2394 | } | |
2395 | } | |
2396 | chain = &xfrm_policy_inexact[dir]; | |
2397 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2398 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2399 | pol->type == type && | |
2400 | pol->priority < priority) { | |
2401 | ret = pol; | |
2402 | break; | |
2403 | } | |
2404 | } | |
2405 | ||
2406 | if (ret) | |
2407 | xfrm_pol_hold(ret); | |
2408 | ||
2409 | read_unlock_bh(&xfrm_policy_lock); | |
2410 | ||
2411 | return ret; | |
2412 | } | |
2413 | ||
2414 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2415 | { | |
2416 | int match = 0; | |
2417 | ||
2418 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2419 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2420 | switch (t->mode) { | |
2421 | case XFRM_MODE_TUNNEL: | |
2422 | case XFRM_MODE_BEET: | |
2423 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2424 | m->old_family) == 0 && | |
2425 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2426 | m->old_family) == 0) { | |
2427 | match = 1; | |
2428 | } | |
2429 | break; | |
2430 | case XFRM_MODE_TRANSPORT: | |
2431 | /* in case of transport mode, template does not store | |
2432 | any IP addresses, hence we just compare mode and | |
2433 | protocol */ | |
2434 | match = 1; | |
2435 | break; | |
2436 | default: | |
2437 | break; | |
2438 | } | |
2439 | } | |
2440 | return match; | |
2441 | } | |
2442 | ||
2443 | /* update endpoint address(es) of template(s) */ | |
2444 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2445 | struct xfrm_migrate *m, int num_migrate) | |
2446 | { | |
2447 | struct xfrm_migrate *mp; | |
2448 | struct dst_entry *dst; | |
2449 | int i, j, n = 0; | |
2450 | ||
2451 | write_lock_bh(&pol->lock); | |
2452 | if (unlikely(pol->dead)) { | |
2453 | /* target policy has been deleted */ | |
2454 | write_unlock_bh(&pol->lock); | |
2455 | return -ENOENT; | |
2456 | } | |
2457 | ||
2458 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2459 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2460 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2461 | continue; | |
2462 | n++; | |
2463 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL) | |
2464 | continue; | |
2465 | /* update endpoints */ | |
2466 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2467 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2468 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2469 | sizeof(pol->xfrm_vec[i].saddr)); | |
2470 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2471 | /* flush bundles */ | |
2472 | while ((dst = pol->bundles) != NULL) { | |
2473 | pol->bundles = dst->next; | |
2474 | dst_free(dst); | |
2475 | } | |
2476 | } | |
2477 | } | |
2478 | ||
2479 | write_unlock_bh(&pol->lock); | |
2480 | ||
2481 | if (!n) | |
2482 | return -ENODATA; | |
2483 | ||
2484 | return 0; | |
2485 | } | |
2486 | ||
2487 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2488 | { | |
2489 | int i, j; | |
2490 | ||
2491 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2492 | return -EINVAL; | |
2493 | ||
2494 | for (i = 0; i < num_migrate; i++) { | |
2495 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2496 | m[i].old_family) == 0) && | |
2497 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2498 | m[i].old_family) == 0)) | |
2499 | return -EINVAL; | |
2500 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2501 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2502 | return -EINVAL; | |
2503 | ||
2504 | /* check if there is any duplicated entry */ | |
2505 | for (j = i + 1; j < num_migrate; j++) { | |
2506 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2507 | sizeof(m[i].old_daddr)) && | |
2508 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2509 | sizeof(m[i].old_saddr)) && | |
2510 | m[i].proto == m[j].proto && | |
2511 | m[i].mode == m[j].mode && | |
2512 | m[i].reqid == m[j].reqid && | |
2513 | m[i].old_family == m[j].old_family) | |
2514 | return -EINVAL; | |
2515 | } | |
2516 | } | |
2517 | ||
2518 | return 0; | |
2519 | } | |
2520 | ||
2521 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
2522 | struct xfrm_migrate *m, int num_migrate) | |
2523 | { | |
2524 | int i, err, nx_cur = 0, nx_new = 0; | |
2525 | struct xfrm_policy *pol = NULL; | |
2526 | struct xfrm_state *x, *xc; | |
2527 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2528 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2529 | struct xfrm_migrate *mp; | |
2530 | ||
2531 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2532 | goto out; | |
2533 | ||
2534 | /* Stage 1 - find policy */ | |
2535 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2536 | err = -ENOENT; | |
2537 | goto out; | |
2538 | } | |
2539 | ||
2540 | /* Stage 2 - find and update state(s) */ | |
2541 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2542 | if ((x = xfrm_migrate_state_find(mp))) { | |
2543 | x_cur[nx_cur] = x; | |
2544 | nx_cur++; | |
2545 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2546 | x_new[nx_new] = xc; | |
2547 | nx_new++; | |
2548 | } else { | |
2549 | err = -ENODATA; | |
2550 | goto restore_state; | |
2551 | } | |
2552 | } | |
2553 | } | |
2554 | ||
2555 | /* Stage 3 - update policy */ | |
2556 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2557 | goto restore_state; | |
2558 | ||
2559 | /* Stage 4 - delete old state(s) */ | |
2560 | if (nx_cur) { | |
2561 | xfrm_states_put(x_cur, nx_cur); | |
2562 | xfrm_states_delete(x_cur, nx_cur); | |
2563 | } | |
2564 | ||
2565 | /* Stage 5 - announce */ | |
2566 | km_migrate(sel, dir, type, m, num_migrate); | |
2567 | ||
2568 | xfrm_pol_put(pol); | |
2569 | ||
2570 | return 0; | |
2571 | out: | |
2572 | return err; | |
2573 | ||
2574 | restore_state: | |
2575 | if (pol) | |
2576 | xfrm_pol_put(pol); | |
2577 | if (nx_cur) | |
2578 | xfrm_states_put(x_cur, nx_cur); | |
2579 | if (nx_new) | |
2580 | xfrm_states_delete(x_new, nx_new); | |
2581 | ||
2582 | return err; | |
2583 | } | |
e610e679 | 2584 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa SS |
2585 | #endif |
2586 |