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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> | |
28 | ||
44e36b42 DM |
29 | #include "xfrm_hash.h" |
30 | ||
aad0e0b9 | 31 | int sysctl_xfrm_larval_drop __read_mostly; |
14e50e57 | 32 | |
4a3e2f71 AV |
33 | DEFINE_MUTEX(xfrm_cfg_mutex); |
34 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 LT |
35 | |
36 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
37 | ||
2518c7c2 DM |
38 | unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
39 | EXPORT_SYMBOL(xfrm_policy_count); | |
1da177e4 LT |
40 | |
41 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
42 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
43 | ||
e18b890b | 44 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 LT |
45 | |
46 | static struct work_struct xfrm_policy_gc_work; | |
2518c7c2 | 47 | static HLIST_HEAD(xfrm_policy_gc_list); |
1da177e4 LT |
48 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
49 | ||
50 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
51 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
546be240 HX |
52 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family); |
53 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo); | |
1da177e4 | 54 | |
77681021 AM |
55 | static inline int |
56 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
57 | { | |
58 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
59 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
60 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
61 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
62 | (fl->proto == sel->proto || !sel->proto) && | |
63 | (fl->oif == sel->ifindex || !sel->ifindex); | |
64 | } | |
65 | ||
66 | static inline int | |
67 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
68 | { | |
69 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
70 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
71 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
72 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
73 | (fl->proto == sel->proto || !sel->proto) && | |
74 | (fl->oif == sel->ifindex || !sel->ifindex); | |
75 | } | |
76 | ||
77 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
78 | unsigned short family) | |
79 | { | |
80 | switch (family) { | |
81 | case AF_INET: | |
82 | return __xfrm4_selector_match(sel, fl); | |
83 | case AF_INET6: | |
84 | return __xfrm6_selector_match(sel, fl); | |
85 | } | |
86 | return 0; | |
87 | } | |
88 | ||
1da177e4 LT |
89 | int xfrm_register_type(struct xfrm_type *type, unsigned short family) |
90 | { | |
546be240 HX |
91 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family); |
92 | struct xfrm_type **typemap; | |
1da177e4 LT |
93 | int err = 0; |
94 | ||
95 | if (unlikely(afinfo == NULL)) | |
96 | return -EAFNOSUPPORT; | |
97 | typemap = afinfo->type_map; | |
98 | ||
546be240 HX |
99 | if (likely(typemap[type->proto] == NULL)) |
100 | typemap[type->proto] = type; | |
1da177e4 LT |
101 | else |
102 | err = -EEXIST; | |
546be240 | 103 | xfrm_policy_unlock_afinfo(afinfo); |
1da177e4 LT |
104 | return err; |
105 | } | |
106 | EXPORT_SYMBOL(xfrm_register_type); | |
107 | ||
108 | int xfrm_unregister_type(struct xfrm_type *type, unsigned short family) | |
109 | { | |
546be240 HX |
110 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family); |
111 | struct xfrm_type **typemap; | |
1da177e4 LT |
112 | int err = 0; |
113 | ||
114 | if (unlikely(afinfo == NULL)) | |
115 | return -EAFNOSUPPORT; | |
116 | typemap = afinfo->type_map; | |
117 | ||
546be240 | 118 | if (unlikely(typemap[type->proto] != type)) |
1da177e4 LT |
119 | err = -ENOENT; |
120 | else | |
546be240 HX |
121 | typemap[type->proto] = NULL; |
122 | xfrm_policy_unlock_afinfo(afinfo); | |
1da177e4 LT |
123 | return err; |
124 | } | |
125 | EXPORT_SYMBOL(xfrm_unregister_type); | |
126 | ||
127 | struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) | |
128 | { | |
129 | struct xfrm_policy_afinfo *afinfo; | |
546be240 | 130 | struct xfrm_type **typemap; |
1da177e4 LT |
131 | struct xfrm_type *type; |
132 | int modload_attempted = 0; | |
133 | ||
134 | retry: | |
135 | afinfo = xfrm_policy_get_afinfo(family); | |
136 | if (unlikely(afinfo == NULL)) | |
137 | return NULL; | |
138 | typemap = afinfo->type_map; | |
139 | ||
546be240 | 140 | type = typemap[proto]; |
1da177e4 LT |
141 | if (unlikely(type && !try_module_get(type->owner))) |
142 | type = NULL; | |
1da177e4 LT |
143 | if (!type && !modload_attempted) { |
144 | xfrm_policy_put_afinfo(afinfo); | |
145 | request_module("xfrm-type-%d-%d", | |
146 | (int) family, (int) proto); | |
147 | modload_attempted = 1; | |
148 | goto retry; | |
149 | } | |
150 | ||
151 | xfrm_policy_put_afinfo(afinfo); | |
152 | return type; | |
153 | } | |
1da177e4 | 154 | |
a716c119 | 155 | int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, |
1da177e4 LT |
156 | unsigned short family) |
157 | { | |
158 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
159 | int err = 0; | |
160 | ||
161 | if (unlikely(afinfo == NULL)) | |
162 | return -EAFNOSUPPORT; | |
163 | ||
164 | if (likely(afinfo->dst_lookup != NULL)) | |
165 | err = afinfo->dst_lookup(dst, fl); | |
166 | else | |
167 | err = -EINVAL; | |
168 | xfrm_policy_put_afinfo(afinfo); | |
169 | return err; | |
170 | } | |
171 | EXPORT_SYMBOL(xfrm_dst_lookup); | |
172 | ||
173 | void xfrm_put_type(struct xfrm_type *type) | |
174 | { | |
175 | module_put(type->owner); | |
176 | } | |
177 | ||
b59f45d0 HX |
178 | int xfrm_register_mode(struct xfrm_mode *mode, int family) |
179 | { | |
180 | struct xfrm_policy_afinfo *afinfo; | |
181 | struct xfrm_mode **modemap; | |
182 | int err; | |
183 | ||
184 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
185 | return -EINVAL; | |
186 | ||
187 | afinfo = xfrm_policy_lock_afinfo(family); | |
188 | if (unlikely(afinfo == NULL)) | |
189 | return -EAFNOSUPPORT; | |
190 | ||
191 | err = -EEXIST; | |
192 | modemap = afinfo->mode_map; | |
193 | if (likely(modemap[mode->encap] == NULL)) { | |
194 | modemap[mode->encap] = mode; | |
195 | err = 0; | |
196 | } | |
197 | ||
198 | xfrm_policy_unlock_afinfo(afinfo); | |
199 | return err; | |
200 | } | |
201 | EXPORT_SYMBOL(xfrm_register_mode); | |
202 | ||
203 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
204 | { | |
205 | struct xfrm_policy_afinfo *afinfo; | |
206 | struct xfrm_mode **modemap; | |
207 | int err; | |
208 | ||
209 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
210 | return -EINVAL; | |
211 | ||
212 | afinfo = xfrm_policy_lock_afinfo(family); | |
213 | if (unlikely(afinfo == NULL)) | |
214 | return -EAFNOSUPPORT; | |
215 | ||
216 | err = -ENOENT; | |
217 | modemap = afinfo->mode_map; | |
218 | if (likely(modemap[mode->encap] == mode)) { | |
219 | modemap[mode->encap] = NULL; | |
220 | err = 0; | |
221 | } | |
222 | ||
223 | xfrm_policy_unlock_afinfo(afinfo); | |
224 | return err; | |
225 | } | |
226 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
227 | ||
228 | struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
229 | { | |
230 | struct xfrm_policy_afinfo *afinfo; | |
231 | struct xfrm_mode *mode; | |
232 | int modload_attempted = 0; | |
233 | ||
234 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
235 | return NULL; | |
236 | ||
237 | retry: | |
238 | afinfo = xfrm_policy_get_afinfo(family); | |
239 | if (unlikely(afinfo == NULL)) | |
240 | return NULL; | |
241 | ||
242 | mode = afinfo->mode_map[encap]; | |
243 | if (unlikely(mode && !try_module_get(mode->owner))) | |
244 | mode = NULL; | |
245 | if (!mode && !modload_attempted) { | |
246 | xfrm_policy_put_afinfo(afinfo); | |
247 | request_module("xfrm-mode-%d-%d", family, encap); | |
248 | modload_attempted = 1; | |
249 | goto retry; | |
250 | } | |
251 | ||
252 | xfrm_policy_put_afinfo(afinfo); | |
253 | return mode; | |
254 | } | |
255 | ||
256 | void xfrm_put_mode(struct xfrm_mode *mode) | |
257 | { | |
258 | module_put(mode->owner); | |
259 | } | |
260 | ||
1da177e4 LT |
261 | static inline unsigned long make_jiffies(long secs) |
262 | { | |
263 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
264 | return MAX_SCHEDULE_TIMEOUT-1; | |
265 | else | |
a716c119 | 266 | return secs*HZ; |
1da177e4 LT |
267 | } |
268 | ||
269 | static void xfrm_policy_timer(unsigned long data) | |
270 | { | |
271 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 272 | unsigned long now = get_seconds(); |
1da177e4 LT |
273 | long next = LONG_MAX; |
274 | int warn = 0; | |
275 | int dir; | |
276 | ||
277 | read_lock(&xp->lock); | |
278 | ||
279 | if (xp->dead) | |
280 | goto out; | |
281 | ||
77d8d7a6 | 282 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
283 | |
284 | if (xp->lft.hard_add_expires_seconds) { | |
285 | long tmo = xp->lft.hard_add_expires_seconds + | |
286 | xp->curlft.add_time - now; | |
287 | if (tmo <= 0) | |
288 | goto expired; | |
289 | if (tmo < next) | |
290 | next = tmo; | |
291 | } | |
292 | if (xp->lft.hard_use_expires_seconds) { | |
293 | long tmo = xp->lft.hard_use_expires_seconds + | |
294 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
295 | if (tmo <= 0) | |
296 | goto expired; | |
297 | if (tmo < next) | |
298 | next = tmo; | |
299 | } | |
300 | if (xp->lft.soft_add_expires_seconds) { | |
301 | long tmo = xp->lft.soft_add_expires_seconds + | |
302 | xp->curlft.add_time - now; | |
303 | if (tmo <= 0) { | |
304 | warn = 1; | |
305 | tmo = XFRM_KM_TIMEOUT; | |
306 | } | |
307 | if (tmo < next) | |
308 | next = tmo; | |
309 | } | |
310 | if (xp->lft.soft_use_expires_seconds) { | |
311 | long tmo = xp->lft.soft_use_expires_seconds + | |
312 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
313 | if (tmo <= 0) { | |
314 | warn = 1; | |
315 | tmo = XFRM_KM_TIMEOUT; | |
316 | } | |
317 | if (tmo < next) | |
318 | next = tmo; | |
319 | } | |
320 | ||
321 | if (warn) | |
6c5c8ca7 | 322 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
323 | if (next != LONG_MAX && |
324 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
325 | xfrm_pol_hold(xp); | |
326 | ||
327 | out: | |
328 | read_unlock(&xp->lock); | |
329 | xfrm_pol_put(xp); | |
330 | return; | |
331 | ||
332 | expired: | |
333 | read_unlock(&xp->lock); | |
4666faab | 334 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 335 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
336 | xfrm_pol_put(xp); |
337 | } | |
338 | ||
339 | ||
340 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
341 | * SPD calls. | |
342 | */ | |
343 | ||
dd0fc66f | 344 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
1da177e4 LT |
345 | { |
346 | struct xfrm_policy *policy; | |
347 | ||
0da974f4 | 348 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
349 | |
350 | if (policy) { | |
2518c7c2 DM |
351 | INIT_HLIST_NODE(&policy->bydst); |
352 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 353 | rwlock_init(&policy->lock); |
2518c7c2 | 354 | atomic_set(&policy->refcnt, 1); |
1da177e4 LT |
355 | init_timer(&policy->timer); |
356 | policy->timer.data = (unsigned long)policy; | |
357 | policy->timer.function = xfrm_policy_timer; | |
358 | } | |
359 | return policy; | |
360 | } | |
361 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
362 | ||
363 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
364 | ||
365 | void __xfrm_policy_destroy(struct xfrm_policy *policy) | |
366 | { | |
09a62660 | 367 | BUG_ON(!policy->dead); |
1da177e4 | 368 | |
09a62660 | 369 | BUG_ON(policy->bundles); |
1da177e4 LT |
370 | |
371 | if (del_timer(&policy->timer)) | |
372 | BUG(); | |
373 | ||
df71837d | 374 | security_xfrm_policy_free(policy); |
1da177e4 LT |
375 | kfree(policy); |
376 | } | |
377 | EXPORT_SYMBOL(__xfrm_policy_destroy); | |
378 | ||
379 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
380 | { | |
381 | struct dst_entry *dst; | |
382 | ||
383 | while ((dst = policy->bundles) != NULL) { | |
384 | policy->bundles = dst->next; | |
385 | dst_free(dst); | |
386 | } | |
387 | ||
388 | if (del_timer(&policy->timer)) | |
389 | atomic_dec(&policy->refcnt); | |
390 | ||
391 | if (atomic_read(&policy->refcnt) > 1) | |
392 | flow_cache_flush(); | |
393 | ||
394 | xfrm_pol_put(policy); | |
395 | } | |
396 | ||
c4028958 | 397 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
398 | { |
399 | struct xfrm_policy *policy; | |
2518c7c2 DM |
400 | struct hlist_node *entry, *tmp; |
401 | struct hlist_head gc_list; | |
1da177e4 LT |
402 | |
403 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
404 | gc_list.first = xfrm_policy_gc_list.first; |
405 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
406 | spin_unlock_bh(&xfrm_policy_gc_lock); |
407 | ||
2518c7c2 | 408 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 409 | xfrm_policy_gc_kill(policy); |
1da177e4 LT |
410 | } |
411 | ||
412 | /* Rule must be locked. Release descentant resources, announce | |
413 | * entry dead. The rule must be unlinked from lists to the moment. | |
414 | */ | |
415 | ||
416 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
417 | { | |
418 | int dead; | |
419 | ||
420 | write_lock_bh(&policy->lock); | |
421 | dead = policy->dead; | |
422 | policy->dead = 1; | |
423 | write_unlock_bh(&policy->lock); | |
424 | ||
425 | if (unlikely(dead)) { | |
426 | WARN_ON(1); | |
427 | return; | |
428 | } | |
429 | ||
430 | spin_lock(&xfrm_policy_gc_lock); | |
2518c7c2 | 431 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
1da177e4 LT |
432 | spin_unlock(&xfrm_policy_gc_lock); |
433 | ||
434 | schedule_work(&xfrm_policy_gc_work); | |
435 | } | |
436 | ||
2518c7c2 DM |
437 | struct xfrm_policy_hash { |
438 | struct hlist_head *table; | |
439 | unsigned int hmask; | |
440 | }; | |
441 | ||
442 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
443 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
444 | static struct hlist_head *xfrm_policy_byidx __read_mostly; | |
445 | static unsigned int xfrm_idx_hmask __read_mostly; | |
446 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
447 | ||
2518c7c2 DM |
448 | static inline unsigned int idx_hash(u32 index) |
449 | { | |
450 | return __idx_hash(index, xfrm_idx_hmask); | |
451 | } | |
452 | ||
2518c7c2 DM |
453 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
454 | { | |
455 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
456 | unsigned int hash = __sel_hash(sel, family, hmask); | |
457 | ||
458 | return (hash == hmask + 1 ? | |
459 | &xfrm_policy_inexact[dir] : | |
460 | xfrm_policy_bydst[dir].table + hash); | |
461 | } | |
462 | ||
463 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
464 | { | |
465 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
466 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
467 | ||
468 | return xfrm_policy_bydst[dir].table + hash; | |
469 | } | |
470 | ||
2518c7c2 DM |
471 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
472 | struct hlist_head *ndsttable, | |
473 | unsigned int nhashmask) | |
474 | { | |
475 | struct hlist_node *entry, *tmp; | |
476 | struct xfrm_policy *pol; | |
477 | ||
478 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { | |
479 | unsigned int h; | |
480 | ||
481 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
482 | pol->family, nhashmask); | |
483 | hlist_add_head(&pol->bydst, ndsttable+h); | |
484 | } | |
485 | } | |
486 | ||
487 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
488 | struct hlist_head *nidxtable, | |
489 | unsigned int nhashmask) | |
490 | { | |
491 | struct hlist_node *entry, *tmp; | |
492 | struct xfrm_policy *pol; | |
493 | ||
494 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
495 | unsigned int h; | |
496 | ||
497 | h = __idx_hash(pol->index, nhashmask); | |
498 | hlist_add_head(&pol->byidx, nidxtable+h); | |
499 | } | |
500 | } | |
501 | ||
502 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
503 | { | |
504 | return ((old_hmask + 1) << 1) - 1; | |
505 | } | |
506 | ||
507 | static void xfrm_bydst_resize(int dir) | |
508 | { | |
509 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
510 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
511 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
512 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 513 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
514 | int i; |
515 | ||
516 | if (!ndst) | |
517 | return; | |
518 | ||
519 | write_lock_bh(&xfrm_policy_lock); | |
520 | ||
521 | for (i = hmask; i >= 0; i--) | |
522 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
523 | ||
524 | xfrm_policy_bydst[dir].table = ndst; | |
525 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
526 | ||
527 | write_unlock_bh(&xfrm_policy_lock); | |
528 | ||
44e36b42 | 529 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
530 | } |
531 | ||
532 | static void xfrm_byidx_resize(int total) | |
533 | { | |
534 | unsigned int hmask = xfrm_idx_hmask; | |
535 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
536 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
537 | struct hlist_head *oidx = xfrm_policy_byidx; | |
44e36b42 | 538 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
539 | int i; |
540 | ||
541 | if (!nidx) | |
542 | return; | |
543 | ||
544 | write_lock_bh(&xfrm_policy_lock); | |
545 | ||
546 | for (i = hmask; i >= 0; i--) | |
547 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
548 | ||
549 | xfrm_policy_byidx = nidx; | |
550 | xfrm_idx_hmask = nhashmask; | |
551 | ||
552 | write_unlock_bh(&xfrm_policy_lock); | |
553 | ||
44e36b42 | 554 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
555 | } |
556 | ||
557 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
558 | { | |
559 | unsigned int cnt = xfrm_policy_count[dir]; | |
560 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
561 | ||
562 | if (total) | |
563 | *total += cnt; | |
564 | ||
565 | if ((hmask + 1) < xfrm_policy_hashmax && | |
566 | cnt > hmask) | |
567 | return 1; | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | static inline int xfrm_byidx_should_resize(int total) | |
573 | { | |
574 | unsigned int hmask = xfrm_idx_hmask; | |
575 | ||
576 | if ((hmask + 1) < xfrm_policy_hashmax && | |
577 | total > hmask) | |
578 | return 1; | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
5a6d3416 | 583 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
584 | { |
585 | read_lock_bh(&xfrm_policy_lock); | |
586 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
587 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
588 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
589 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
590 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
591 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
592 | si->spdhcnt = xfrm_idx_hmask; | |
593 | si->spdhmcnt = xfrm_policy_hashmax; | |
594 | read_unlock_bh(&xfrm_policy_lock); | |
595 | } | |
596 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 597 | |
ecfd6b18 | 598 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 599 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
600 | { |
601 | int dir, total; | |
602 | ||
603 | mutex_lock(&hash_resize_mutex); | |
604 | ||
605 | total = 0; | |
606 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
607 | if (xfrm_bydst_should_resize(dir, &total)) | |
608 | xfrm_bydst_resize(dir); | |
609 | } | |
610 | if (xfrm_byidx_should_resize(total)) | |
611 | xfrm_byidx_resize(total); | |
612 | ||
613 | mutex_unlock(&hash_resize_mutex); | |
614 | } | |
615 | ||
c4028958 | 616 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 617 | |
1da177e4 LT |
618 | /* Generate new index... KAME seems to generate them ordered by cost |
619 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
4e81bb83 | 620 | static u32 xfrm_gen_index(u8 type, int dir) |
1da177e4 | 621 | { |
1da177e4 LT |
622 | static u32 idx_generator; |
623 | ||
624 | for (;;) { | |
2518c7c2 DM |
625 | struct hlist_node *entry; |
626 | struct hlist_head *list; | |
627 | struct xfrm_policy *p; | |
628 | u32 idx; | |
629 | int found; | |
630 | ||
1da177e4 LT |
631 | idx = (idx_generator | dir); |
632 | idx_generator += 8; | |
633 | if (idx == 0) | |
634 | idx = 8; | |
2518c7c2 DM |
635 | list = xfrm_policy_byidx + idx_hash(idx); |
636 | found = 0; | |
637 | hlist_for_each_entry(p, entry, list, byidx) { | |
638 | if (p->index == idx) { | |
639 | found = 1; | |
1da177e4 | 640 | break; |
2518c7c2 | 641 | } |
1da177e4 | 642 | } |
2518c7c2 | 643 | if (!found) |
1da177e4 LT |
644 | return idx; |
645 | } | |
646 | } | |
647 | ||
2518c7c2 DM |
648 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
649 | { | |
650 | u32 *p1 = (u32 *) s1; | |
651 | u32 *p2 = (u32 *) s2; | |
652 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
653 | int i; | |
654 | ||
655 | for (i = 0; i < len; i++) { | |
656 | if (p1[i] != p2[i]) | |
657 | return 1; | |
658 | } | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
1da177e4 LT |
663 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
664 | { | |
2518c7c2 DM |
665 | struct xfrm_policy *pol; |
666 | struct xfrm_policy *delpol; | |
667 | struct hlist_head *chain; | |
a6c7ab55 | 668 | struct hlist_node *entry, *newpos; |
9b78a82c | 669 | struct dst_entry *gc_list; |
1da177e4 LT |
670 | |
671 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
672 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
673 | delpol = NULL; | |
674 | newpos = NULL; | |
2518c7c2 | 675 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 676 | if (pol->type == policy->type && |
2518c7c2 | 677 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
678 | xfrm_sec_ctx_match(pol->security, policy->security) && |
679 | !WARN_ON(delpol)) { | |
1da177e4 LT |
680 | if (excl) { |
681 | write_unlock_bh(&xfrm_policy_lock); | |
682 | return -EEXIST; | |
683 | } | |
1da177e4 LT |
684 | delpol = pol; |
685 | if (policy->priority > pol->priority) | |
686 | continue; | |
687 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 688 | newpos = &pol->bydst; |
1da177e4 LT |
689 | continue; |
690 | } | |
1da177e4 LT |
691 | if (delpol) |
692 | break; | |
1da177e4 LT |
693 | } |
694 | if (newpos) | |
2518c7c2 DM |
695 | hlist_add_after(newpos, &policy->bydst); |
696 | else | |
697 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 698 | xfrm_pol_hold(policy); |
2518c7c2 | 699 | xfrm_policy_count[dir]++; |
1da177e4 | 700 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
701 | if (delpol) { |
702 | hlist_del(&delpol->bydst); | |
703 | hlist_del(&delpol->byidx); | |
704 | xfrm_policy_count[dir]--; | |
705 | } | |
4e81bb83 | 706 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 707 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 708 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
709 | policy->curlft.use_time = 0; |
710 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
711 | xfrm_pol_hold(policy); | |
712 | write_unlock_bh(&xfrm_policy_lock); | |
713 | ||
9b78a82c | 714 | if (delpol) |
1da177e4 | 715 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
716 | else if (xfrm_bydst_should_resize(dir, NULL)) |
717 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
718 | |
719 | read_lock_bh(&xfrm_policy_lock); | |
720 | gc_list = NULL; | |
2518c7c2 DM |
721 | entry = &policy->bydst; |
722 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
723 | struct dst_entry *dst; |
724 | ||
725 | write_lock(&policy->lock); | |
726 | dst = policy->bundles; | |
727 | if (dst) { | |
728 | struct dst_entry *tail = dst; | |
729 | while (tail->next) | |
730 | tail = tail->next; | |
731 | tail->next = gc_list; | |
732 | gc_list = dst; | |
733 | ||
734 | policy->bundles = NULL; | |
735 | } | |
736 | write_unlock(&policy->lock); | |
1da177e4 | 737 | } |
9b78a82c DM |
738 | read_unlock_bh(&xfrm_policy_lock); |
739 | ||
740 | while (gc_list) { | |
741 | struct dst_entry *dst = gc_list; | |
742 | ||
743 | gc_list = dst->next; | |
744 | dst_free(dst); | |
745 | } | |
746 | ||
1da177e4 LT |
747 | return 0; |
748 | } | |
749 | EXPORT_SYMBOL(xfrm_policy_insert); | |
750 | ||
4e81bb83 MN |
751 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
752 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
753 | struct xfrm_sec_ctx *ctx, int delete, |
754 | int *err) | |
1da177e4 | 755 | { |
2518c7c2 DM |
756 | struct xfrm_policy *pol, *ret; |
757 | struct hlist_head *chain; | |
758 | struct hlist_node *entry; | |
1da177e4 | 759 | |
ef41aaa0 | 760 | *err = 0; |
1da177e4 | 761 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
762 | chain = policy_hash_bysel(sel, sel->family, dir); |
763 | ret = NULL; | |
764 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
765 | if (pol->type == type && | |
766 | !selector_cmp(sel, &pol->selector) && | |
767 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 768 | xfrm_pol_hold(pol); |
2518c7c2 | 769 | if (delete) { |
ef41aaa0 EP |
770 | *err = security_xfrm_policy_delete(pol); |
771 | if (*err) { | |
772 | write_unlock_bh(&xfrm_policy_lock); | |
773 | return pol; | |
774 | } | |
2518c7c2 DM |
775 | hlist_del(&pol->bydst); |
776 | hlist_del(&pol->byidx); | |
777 | xfrm_policy_count[dir]--; | |
778 | } | |
779 | ret = pol; | |
1da177e4 LT |
780 | break; |
781 | } | |
782 | } | |
783 | write_unlock_bh(&xfrm_policy_lock); | |
784 | ||
2518c7c2 | 785 | if (ret && delete) { |
1da177e4 | 786 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 787 | xfrm_policy_kill(ret); |
1da177e4 | 788 | } |
2518c7c2 | 789 | return ret; |
1da177e4 | 790 | } |
df71837d | 791 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 792 | |
ef41aaa0 EP |
793 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
794 | int *err) | |
1da177e4 | 795 | { |
2518c7c2 DM |
796 | struct xfrm_policy *pol, *ret; |
797 | struct hlist_head *chain; | |
798 | struct hlist_node *entry; | |
1da177e4 | 799 | |
b5505c6e HX |
800 | *err = -ENOENT; |
801 | if (xfrm_policy_id2dir(id) != dir) | |
802 | return NULL; | |
803 | ||
ef41aaa0 | 804 | *err = 0; |
1da177e4 | 805 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
806 | chain = xfrm_policy_byidx + idx_hash(id); |
807 | ret = NULL; | |
808 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
809 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 810 | xfrm_pol_hold(pol); |
2518c7c2 | 811 | if (delete) { |
ef41aaa0 EP |
812 | *err = security_xfrm_policy_delete(pol); |
813 | if (*err) { | |
814 | write_unlock_bh(&xfrm_policy_lock); | |
815 | return pol; | |
816 | } | |
2518c7c2 DM |
817 | hlist_del(&pol->bydst); |
818 | hlist_del(&pol->byidx); | |
819 | xfrm_policy_count[dir]--; | |
820 | } | |
821 | ret = pol; | |
1da177e4 LT |
822 | break; |
823 | } | |
824 | } | |
825 | write_unlock_bh(&xfrm_policy_lock); | |
826 | ||
2518c7c2 | 827 | if (ret && delete) { |
1da177e4 | 828 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 829 | xfrm_policy_kill(ret); |
1da177e4 | 830 | } |
2518c7c2 | 831 | return ret; |
1da177e4 LT |
832 | } |
833 | EXPORT_SYMBOL(xfrm_policy_byid); | |
834 | ||
4aa2e62c JL |
835 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
836 | static inline int | |
837 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
1da177e4 | 838 | { |
4aa2e62c JL |
839 | int dir, err = 0; |
840 | ||
841 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
842 | struct xfrm_policy *pol; | |
843 | struct hlist_node *entry; | |
844 | int i; | |
845 | ||
846 | hlist_for_each_entry(pol, entry, | |
847 | &xfrm_policy_inexact[dir], bydst) { | |
848 | if (pol->type != type) | |
849 | continue; | |
850 | err = security_xfrm_policy_delete(pol); | |
851 | if (err) { | |
ab5f5e8b JL |
852 | xfrm_audit_policy_delete(pol, 0, |
853 | audit_info->loginuid, | |
854 | audit_info->secid); | |
4aa2e62c JL |
855 | return err; |
856 | } | |
7dc12d6d | 857 | } |
4aa2e62c JL |
858 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
859 | hlist_for_each_entry(pol, entry, | |
860 | xfrm_policy_bydst[dir].table + i, | |
861 | bydst) { | |
862 | if (pol->type != type) | |
863 | continue; | |
864 | err = security_xfrm_policy_delete(pol); | |
865 | if (err) { | |
ab5f5e8b JL |
866 | xfrm_audit_policy_delete(pol, 0, |
867 | audit_info->loginuid, | |
868 | audit_info->secid); | |
4aa2e62c JL |
869 | return err; |
870 | } | |
871 | } | |
872 | } | |
873 | } | |
874 | return err; | |
875 | } | |
876 | #else | |
877 | static inline int | |
878 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
879 | { | |
880 | return 0; | |
881 | } | |
882 | #endif | |
883 | ||
884 | int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) | |
885 | { | |
886 | int dir, err = 0; | |
1da177e4 LT |
887 | |
888 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c JL |
889 | |
890 | err = xfrm_policy_flush_secctx_check(type, audit_info); | |
891 | if (err) | |
892 | goto out; | |
893 | ||
1da177e4 | 894 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
895 | struct xfrm_policy *pol; |
896 | struct hlist_node *entry; | |
ae8c0577 | 897 | int i, killed; |
2518c7c2 | 898 | |
ae8c0577 | 899 | killed = 0; |
2518c7c2 DM |
900 | again1: |
901 | hlist_for_each_entry(pol, entry, | |
902 | &xfrm_policy_inexact[dir], bydst) { | |
903 | if (pol->type != type) | |
904 | continue; | |
905 | hlist_del(&pol->bydst); | |
906 | hlist_del(&pol->byidx); | |
1da177e4 LT |
907 | write_unlock_bh(&xfrm_policy_lock); |
908 | ||
ab5f5e8b JL |
909 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
910 | audit_info->secid); | |
161a09e7 | 911 | |
2518c7c2 | 912 | xfrm_policy_kill(pol); |
ae8c0577 | 913 | killed++; |
1da177e4 LT |
914 | |
915 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
916 | goto again1; |
917 | } | |
918 | ||
919 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
920 | again2: | |
921 | hlist_for_each_entry(pol, entry, | |
922 | xfrm_policy_bydst[dir].table + i, | |
923 | bydst) { | |
924 | if (pol->type != type) | |
925 | continue; | |
926 | hlist_del(&pol->bydst); | |
927 | hlist_del(&pol->byidx); | |
928 | write_unlock_bh(&xfrm_policy_lock); | |
929 | ||
ab5f5e8b JL |
930 | xfrm_audit_policy_delete(pol, 1, |
931 | audit_info->loginuid, | |
932 | audit_info->secid); | |
2518c7c2 | 933 | xfrm_policy_kill(pol); |
ae8c0577 | 934 | killed++; |
2518c7c2 DM |
935 | |
936 | write_lock_bh(&xfrm_policy_lock); | |
937 | goto again2; | |
938 | } | |
1da177e4 | 939 | } |
2518c7c2 | 940 | |
ae8c0577 | 941 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
942 | } |
943 | atomic_inc(&flow_cache_genid); | |
4aa2e62c | 944 | out: |
1da177e4 | 945 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 946 | return err; |
1da177e4 LT |
947 | } |
948 | EXPORT_SYMBOL(xfrm_policy_flush); | |
949 | ||
4e81bb83 | 950 | int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
951 | void *data) |
952 | { | |
baf5d743 | 953 | struct xfrm_policy *pol, *last = NULL; |
2518c7c2 | 954 | struct hlist_node *entry; |
baf5d743 | 955 | int dir, last_dir = 0, count, error; |
1da177e4 LT |
956 | |
957 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 | 958 | count = 0; |
1da177e4 LT |
959 | |
960 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
961 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
962 | int i; | |
963 | ||
964 | hlist_for_each_entry(pol, entry, | |
965 | &xfrm_policy_inexact[dir], bydst) { | |
966 | if (pol->type != type) | |
967 | continue; | |
baf5d743 JHS |
968 | if (last) { |
969 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
970 | count, data); | |
971 | if (error) | |
972 | goto out; | |
973 | } | |
974 | last = pol; | |
975 | last_dir = dir; | |
976 | count++; | |
1da177e4 | 977 | } |
2518c7c2 DM |
978 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
979 | hlist_for_each_entry(pol, entry, table + i, bydst) { | |
980 | if (pol->type != type) | |
981 | continue; | |
baf5d743 JHS |
982 | if (last) { |
983 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
984 | count, data); | |
985 | if (error) | |
986 | goto out; | |
987 | } | |
988 | last = pol; | |
989 | last_dir = dir; | |
990 | count++; | |
2518c7c2 DM |
991 | } |
992 | } | |
1da177e4 | 993 | } |
baf5d743 JHS |
994 | if (count == 0) { |
995 | error = -ENOENT; | |
996 | goto out; | |
997 | } | |
998 | error = func(last, last_dir % XFRM_POLICY_MAX, 0, data); | |
1da177e4 LT |
999 | out: |
1000 | read_unlock_bh(&xfrm_policy_lock); | |
1001 | return error; | |
1002 | } | |
1003 | EXPORT_SYMBOL(xfrm_policy_walk); | |
1004 | ||
134b0fc5 JM |
1005 | /* |
1006 | * Find policy to apply to this flow. | |
1007 | * | |
1008 | * Returns 0 if policy found, else an -errno. | |
1009 | */ | |
2518c7c2 DM |
1010 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
1011 | u8 type, u16 family, int dir) | |
1da177e4 | 1012 | { |
2518c7c2 | 1013 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 1014 | int match, ret = -ESRCH; |
1da177e4 | 1015 | |
2518c7c2 DM |
1016 | if (pol->family != family || |
1017 | pol->type != type) | |
134b0fc5 | 1018 | return ret; |
1da177e4 | 1019 | |
2518c7c2 | 1020 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 JM |
1021 | if (match) |
1022 | ret = security_xfrm_policy_lookup(pol, fl->secid, dir); | |
2518c7c2 | 1023 | |
134b0fc5 | 1024 | return ret; |
2518c7c2 | 1025 | } |
1da177e4 | 1026 | |
2518c7c2 DM |
1027 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
1028 | u16 family, u8 dir) | |
1029 | { | |
134b0fc5 | 1030 | int err; |
2518c7c2 DM |
1031 | struct xfrm_policy *pol, *ret; |
1032 | xfrm_address_t *daddr, *saddr; | |
1033 | struct hlist_node *entry; | |
1034 | struct hlist_head *chain; | |
acba48e1 | 1035 | u32 priority = ~0U; |
df71837d | 1036 | |
2518c7c2 DM |
1037 | daddr = xfrm_flowi_daddr(fl, family); |
1038 | saddr = xfrm_flowi_saddr(fl, family); | |
1039 | if (unlikely(!daddr || !saddr)) | |
1040 | return NULL; | |
1041 | ||
1042 | read_lock_bh(&xfrm_policy_lock); | |
1043 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
1044 | ret = NULL; | |
1045 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
1046 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1047 | if (err) { | |
1048 | if (err == -ESRCH) | |
1049 | continue; | |
1050 | else { | |
1051 | ret = ERR_PTR(err); | |
1052 | goto fail; | |
1053 | } | |
1054 | } else { | |
2518c7c2 | 1055 | ret = pol; |
acba48e1 | 1056 | priority = ret->priority; |
2518c7c2 DM |
1057 | break; |
1058 | } | |
1059 | } | |
acba48e1 DM |
1060 | chain = &xfrm_policy_inexact[dir]; |
1061 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
1062 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1063 | if (err) { | |
1064 | if (err == -ESRCH) | |
1065 | continue; | |
1066 | else { | |
1067 | ret = ERR_PTR(err); | |
1068 | goto fail; | |
1069 | } | |
1070 | } else if (pol->priority < priority) { | |
acba48e1 DM |
1071 | ret = pol; |
1072 | break; | |
1da177e4 LT |
1073 | } |
1074 | } | |
acba48e1 DM |
1075 | if (ret) |
1076 | xfrm_pol_hold(ret); | |
134b0fc5 | 1077 | fail: |
1da177e4 | 1078 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 1079 | |
2518c7c2 | 1080 | return ret; |
4e81bb83 MN |
1081 | } |
1082 | ||
134b0fc5 | 1083 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
1084 | void **objp, atomic_t **obj_refp) |
1085 | { | |
1086 | struct xfrm_policy *pol; | |
134b0fc5 | 1087 | int err = 0; |
4e81bb83 MN |
1088 | |
1089 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1090 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
1091 | if (IS_ERR(pol)) { |
1092 | err = PTR_ERR(pol); | |
1093 | pol = NULL; | |
1094 | } | |
1095 | if (pol || err) | |
4e81bb83 MN |
1096 | goto end; |
1097 | #endif | |
1098 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
1099 | if (IS_ERR(pol)) { |
1100 | err = PTR_ERR(pol); | |
1101 | pol = NULL; | |
1102 | } | |
4e81bb83 | 1103 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1104 | end: |
4e81bb83 | 1105 | #endif |
1da177e4 LT |
1106 | if ((*objp = (void *) pol) != NULL) |
1107 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1108 | return err; |
1da177e4 LT |
1109 | } |
1110 | ||
df71837d TJ |
1111 | static inline int policy_to_flow_dir(int dir) |
1112 | { | |
1113 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1114 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1115 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1116 | return dir; | |
1117 | switch (dir) { | |
1118 | default: | |
1119 | case XFRM_POLICY_IN: | |
1120 | return FLOW_DIR_IN; | |
1121 | case XFRM_POLICY_OUT: | |
1122 | return FLOW_DIR_OUT; | |
1123 | case XFRM_POLICY_FWD: | |
1124 | return FLOW_DIR_FWD; | |
3ff50b79 | 1125 | } |
df71837d TJ |
1126 | } |
1127 | ||
e0d1caa7 | 1128 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1129 | { |
1130 | struct xfrm_policy *pol; | |
1131 | ||
1132 | read_lock_bh(&xfrm_policy_lock); | |
1133 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1134 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1135 | sk->sk_family); |
a716c119 | 1136 | int err = 0; |
df71837d | 1137 | |
3bccfbc7 VY |
1138 | if (match) { |
1139 | err = security_xfrm_policy_lookup(pol, fl->secid, | |
1140 | policy_to_flow_dir(dir)); | |
1141 | if (!err) | |
1142 | xfrm_pol_hold(pol); | |
1143 | else if (err == -ESRCH) | |
1144 | pol = NULL; | |
1145 | else | |
1146 | pol = ERR_PTR(err); | |
1147 | } else | |
1da177e4 LT |
1148 | pol = NULL; |
1149 | } | |
1150 | read_unlock_bh(&xfrm_policy_lock); | |
1151 | return pol; | |
1152 | } | |
1153 | ||
1154 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1155 | { | |
2518c7c2 DM |
1156 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1157 | pol->family, dir); | |
4e81bb83 | 1158 | |
2518c7c2 DM |
1159 | hlist_add_head(&pol->bydst, chain); |
1160 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1161 | xfrm_policy_count[dir]++; | |
1da177e4 | 1162 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1163 | |
1164 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1165 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1166 | } |
1167 | ||
1168 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1169 | int dir) | |
1170 | { | |
2518c7c2 DM |
1171 | if (hlist_unhashed(&pol->bydst)) |
1172 | return NULL; | |
1da177e4 | 1173 | |
2518c7c2 DM |
1174 | hlist_del(&pol->bydst); |
1175 | hlist_del(&pol->byidx); | |
1176 | xfrm_policy_count[dir]--; | |
1177 | ||
1178 | return pol; | |
1da177e4 LT |
1179 | } |
1180 | ||
4666faab | 1181 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1182 | { |
1183 | write_lock_bh(&xfrm_policy_lock); | |
1184 | pol = __xfrm_policy_unlink(pol, dir); | |
1185 | write_unlock_bh(&xfrm_policy_lock); | |
1186 | if (pol) { | |
1187 | if (dir < XFRM_POLICY_MAX) | |
1188 | atomic_inc(&flow_cache_genid); | |
1189 | xfrm_policy_kill(pol); | |
4666faab | 1190 | return 0; |
1da177e4 | 1191 | } |
4666faab | 1192 | return -ENOENT; |
1da177e4 | 1193 | } |
a70fcb0b | 1194 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1195 | |
1196 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1197 | { | |
1198 | struct xfrm_policy *old_pol; | |
1199 | ||
4e81bb83 MN |
1200 | #ifdef CONFIG_XFRM_SUB_POLICY |
1201 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1202 | return -EINVAL; | |
1203 | #endif | |
1204 | ||
1da177e4 LT |
1205 | write_lock_bh(&xfrm_policy_lock); |
1206 | old_pol = sk->sk_policy[dir]; | |
1207 | sk->sk_policy[dir] = pol; | |
1208 | if (pol) { | |
9d729f72 | 1209 | pol->curlft.add_time = get_seconds(); |
4e81bb83 | 1210 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1211 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1212 | } | |
1213 | if (old_pol) | |
1214 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1215 | write_unlock_bh(&xfrm_policy_lock); | |
1216 | ||
1217 | if (old_pol) { | |
1218 | xfrm_policy_kill(old_pol); | |
1219 | } | |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1224 | { | |
1225 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1226 | ||
1227 | if (newp) { | |
1228 | newp->selector = old->selector; | |
df71837d TJ |
1229 | if (security_xfrm_policy_clone(old, newp)) { |
1230 | kfree(newp); | |
1231 | return NULL; /* ENOMEM */ | |
1232 | } | |
1da177e4 LT |
1233 | newp->lft = old->lft; |
1234 | newp->curlft = old->curlft; | |
1235 | newp->action = old->action; | |
1236 | newp->flags = old->flags; | |
1237 | newp->xfrm_nr = old->xfrm_nr; | |
1238 | newp->index = old->index; | |
4e81bb83 | 1239 | newp->type = old->type; |
1da177e4 LT |
1240 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1241 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1242 | write_lock_bh(&xfrm_policy_lock); | |
1243 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1244 | write_unlock_bh(&xfrm_policy_lock); | |
1245 | xfrm_pol_put(newp); | |
1246 | } | |
1247 | return newp; | |
1248 | } | |
1249 | ||
1250 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1251 | { | |
1252 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1253 | *p1 = sk->sk_policy[1]; | |
1254 | ||
1255 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1256 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1257 | return -ENOMEM; | |
1258 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1259 | return -ENOMEM; | |
1260 | return 0; | |
1261 | } | |
1262 | ||
a1e59abf PM |
1263 | static int |
1264 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1265 | unsigned short family) | |
1266 | { | |
1267 | int err; | |
1268 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1269 | ||
1270 | if (unlikely(afinfo == NULL)) | |
1271 | return -EINVAL; | |
1272 | err = afinfo->get_saddr(local, remote); | |
1273 | xfrm_policy_put_afinfo(afinfo); | |
1274 | return err; | |
1275 | } | |
1276 | ||
1da177e4 LT |
1277 | /* Resolve list of templates for the flow, given policy. */ |
1278 | ||
1279 | static int | |
4e81bb83 MN |
1280 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1281 | struct xfrm_state **xfrm, | |
1282 | unsigned short family) | |
1da177e4 LT |
1283 | { |
1284 | int nx; | |
1285 | int i, error; | |
1286 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1287 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1288 | xfrm_address_t tmp; |
1da177e4 LT |
1289 | |
1290 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1291 | struct xfrm_state *x; | |
1292 | xfrm_address_t *remote = daddr; | |
1293 | xfrm_address_t *local = saddr; | |
1294 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1295 | ||
48b8d783 JK |
1296 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1297 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1298 | remote = &tmpl->id.daddr; |
1299 | local = &tmpl->saddr; | |
76b3f055 | 1300 | family = tmpl->encap_family; |
a1e59abf PM |
1301 | if (xfrm_addr_any(local, family)) { |
1302 | error = xfrm_get_saddr(&tmp, remote, family); | |
1303 | if (error) | |
1304 | goto fail; | |
1305 | local = &tmp; | |
1306 | } | |
1da177e4 LT |
1307 | } |
1308 | ||
1309 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1310 | ||
1311 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1312 | xfrm[nx++] = x; | |
1313 | daddr = remote; | |
1314 | saddr = local; | |
1315 | continue; | |
1316 | } | |
1317 | if (x) { | |
1318 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1319 | -EINVAL : -EAGAIN); | |
1320 | xfrm_state_put(x); | |
1321 | } | |
1322 | ||
1323 | if (!tmpl->optional) | |
1324 | goto fail; | |
1325 | } | |
1326 | return nx; | |
1327 | ||
1328 | fail: | |
1329 | for (nx--; nx>=0; nx--) | |
1330 | xfrm_state_put(xfrm[nx]); | |
1331 | return error; | |
1332 | } | |
1333 | ||
4e81bb83 MN |
1334 | static int |
1335 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1336 | struct xfrm_state **xfrm, | |
1337 | unsigned short family) | |
1338 | { | |
41a49cc3 MN |
1339 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1340 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1341 | int cnx = 0; |
1342 | int error; | |
1343 | int ret; | |
1344 | int i; | |
1345 | ||
1346 | for (i = 0; i < npols; i++) { | |
1347 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1348 | error = -ENOBUFS; | |
1349 | goto fail; | |
1350 | } | |
41a49cc3 MN |
1351 | |
1352 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1353 | if (ret < 0) { |
1354 | error = ret; | |
1355 | goto fail; | |
1356 | } else | |
1357 | cnx += ret; | |
1358 | } | |
1359 | ||
41a49cc3 MN |
1360 | /* found states are sorted for outbound processing */ |
1361 | if (npols > 1) | |
1362 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1363 | ||
4e81bb83 MN |
1364 | return cnx; |
1365 | ||
1366 | fail: | |
1367 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1368 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1369 | return error; |
1370 | ||
1371 | } | |
1372 | ||
1da177e4 LT |
1373 | /* Check that the bundle accepts the flow and its components are |
1374 | * still valid. | |
1375 | */ | |
1376 | ||
1377 | static struct dst_entry * | |
1378 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1379 | { | |
1380 | struct dst_entry *x; | |
1381 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1382 | if (unlikely(afinfo == NULL)) | |
1383 | return ERR_PTR(-EINVAL); | |
1384 | x = afinfo->find_bundle(fl, policy); | |
1385 | xfrm_policy_put_afinfo(afinfo); | |
1386 | return x; | |
1387 | } | |
1388 | ||
1389 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate | |
1390 | * all the metrics... Shortly, bundle a bundle. | |
1391 | */ | |
1392 | ||
1393 | static int | |
1394 | xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, | |
1395 | struct flowi *fl, struct dst_entry **dst_p, | |
1396 | unsigned short family) | |
1397 | { | |
1398 | int err; | |
1399 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1400 | if (unlikely(afinfo == NULL)) | |
1401 | return -EINVAL; | |
1402 | err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p); | |
1403 | xfrm_policy_put_afinfo(afinfo); | |
1404 | return err; | |
1405 | } | |
1406 | ||
157bfc25 MN |
1407 | static int inline |
1408 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1409 | { | |
1410 | if (!*target) { | |
1411 | *target = kmalloc(size, GFP_ATOMIC); | |
1412 | if (!*target) | |
1413 | return -ENOMEM; | |
1414 | } | |
1415 | memcpy(*target, src, size); | |
1416 | return 0; | |
1417 | } | |
1418 | ||
1419 | static int inline | |
1420 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1421 | { | |
1422 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1423 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1424 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1425 | sel, sizeof(*sel)); | |
1426 | #else | |
1427 | return 0; | |
1428 | #endif | |
1429 | } | |
1430 | ||
1431 | static int inline | |
1432 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1433 | { | |
1434 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1435 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1436 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1437 | #else | |
1438 | return 0; | |
1439 | #endif | |
1440 | } | |
1da177e4 LT |
1441 | |
1442 | static int stale_bundle(struct dst_entry *dst); | |
1443 | ||
1444 | /* Main function: finds/creates a bundle for given flow. | |
1445 | * | |
1446 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1447 | * on interfaces with disabled IPsec. | |
1448 | */ | |
14e50e57 DM |
1449 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
1450 | struct sock *sk, int flags) | |
1da177e4 LT |
1451 | { |
1452 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1453 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1454 | int npols; | |
1455 | int pol_dead; | |
1456 | int xfrm_nr; | |
1457 | int pi; | |
1da177e4 LT |
1458 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1459 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1460 | int nx = 0; | |
1461 | int err; | |
1462 | u32 genid; | |
42cf93cd | 1463 | u16 family; |
df71837d | 1464 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1465 | |
1da177e4 LT |
1466 | restart: |
1467 | genid = atomic_read(&flow_cache_genid); | |
1468 | policy = NULL; | |
4e81bb83 MN |
1469 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1470 | pols[pi] = NULL; | |
1471 | npols = 0; | |
1472 | pol_dead = 0; | |
1473 | xfrm_nr = 0; | |
1474 | ||
f7944fb1 | 1475 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1476 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
3bccfbc7 VY |
1477 | if (IS_ERR(policy)) |
1478 | return PTR_ERR(policy); | |
1479 | } | |
1da177e4 LT |
1480 | |
1481 | if (!policy) { | |
1482 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1483 | if ((dst_orig->flags & DST_NOXFRM) || |
1484 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
1da177e4 LT |
1485 | return 0; |
1486 | ||
e0d1caa7 | 1487 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1488 | dir, xfrm_policy_lookup); |
134b0fc5 JM |
1489 | if (IS_ERR(policy)) |
1490 | return PTR_ERR(policy); | |
1da177e4 LT |
1491 | } |
1492 | ||
1493 | if (!policy) | |
1494 | return 0; | |
1495 | ||
42cf93cd | 1496 | family = dst_orig->ops->family; |
9d729f72 | 1497 | policy->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1498 | pols[0] = policy; |
1499 | npols ++; | |
1500 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 LT |
1501 | |
1502 | switch (policy->action) { | |
1503 | case XFRM_POLICY_BLOCK: | |
1504 | /* Prohibit the flow */ | |
e104411b PM |
1505 | err = -EPERM; |
1506 | goto error; | |
1da177e4 LT |
1507 | |
1508 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1509 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1510 | if (policy->xfrm_nr == 0) { |
1511 | /* Flow passes not transformed. */ | |
1512 | xfrm_pol_put(policy); | |
1513 | return 0; | |
1514 | } | |
4e81bb83 | 1515 | #endif |
1da177e4 LT |
1516 | |
1517 | /* Try to find matching bundle. | |
1518 | * | |
1519 | * LATER: help from flow cache. It is optional, this | |
1520 | * is required only for output policy. | |
1521 | */ | |
1522 | dst = xfrm_find_bundle(fl, policy, family); | |
1523 | if (IS_ERR(dst)) { | |
e104411b PM |
1524 | err = PTR_ERR(dst); |
1525 | goto error; | |
1da177e4 LT |
1526 | } |
1527 | ||
1528 | if (dst) | |
1529 | break; | |
1530 | ||
4e81bb83 MN |
1531 | #ifdef CONFIG_XFRM_SUB_POLICY |
1532 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1533 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1534 | fl, family, | |
1535 | XFRM_POLICY_OUT); | |
1536 | if (pols[1]) { | |
134b0fc5 JM |
1537 | if (IS_ERR(pols[1])) { |
1538 | err = PTR_ERR(pols[1]); | |
1539 | goto error; | |
1540 | } | |
4e81bb83 MN |
1541 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
1542 | err = -EPERM; | |
1543 | goto error; | |
1544 | } | |
1545 | npols ++; | |
1546 | xfrm_nr += pols[1]->xfrm_nr; | |
1547 | } | |
1548 | } | |
1549 | ||
1550 | /* | |
1551 | * Because neither flowi nor bundle information knows about | |
1552 | * transformation template size. On more than one policy usage | |
1553 | * we can realize whether all of them is bypass or not after | |
1554 | * they are searched. See above not-transformed bypass | |
1555 | * is surrounded by non-sub policy configuration, too. | |
1556 | */ | |
1557 | if (xfrm_nr == 0) { | |
1558 | /* Flow passes not transformed. */ | |
1559 | xfrm_pols_put(pols, npols); | |
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | #endif | |
1564 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1565 | |
1566 | if (unlikely(nx<0)) { | |
1567 | err = nx; | |
14e50e57 DM |
1568 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1569 | /* EREMOTE tells the caller to generate | |
1570 | * a one-shot blackhole route. | |
1571 | */ | |
1572 | xfrm_pol_put(policy); | |
1573 | return -EREMOTE; | |
1574 | } | |
1da177e4 LT |
1575 | if (err == -EAGAIN && flags) { |
1576 | DECLARE_WAITQUEUE(wait, current); | |
1577 | ||
1578 | add_wait_queue(&km_waitq, &wait); | |
1579 | set_current_state(TASK_INTERRUPTIBLE); | |
1580 | schedule(); | |
1581 | set_current_state(TASK_RUNNING); | |
1582 | remove_wait_queue(&km_waitq, &wait); | |
1583 | ||
4e81bb83 | 1584 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1585 | |
1586 | if (nx == -EAGAIN && signal_pending(current)) { | |
1587 | err = -ERESTART; | |
1588 | goto error; | |
1589 | } | |
1590 | if (nx == -EAGAIN || | |
1591 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1592 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1593 | goto restart; |
1594 | } | |
1595 | err = nx; | |
1596 | } | |
1597 | if (err < 0) | |
1598 | goto error; | |
1599 | } | |
1600 | if (nx == 0) { | |
1601 | /* Flow passes not transformed. */ | |
4e81bb83 | 1602 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1603 | return 0; |
1604 | } | |
1605 | ||
1606 | dst = dst_orig; | |
1607 | err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family); | |
1608 | ||
1609 | if (unlikely(err)) { | |
1610 | int i; | |
1611 | for (i=0; i<nx; i++) | |
1612 | xfrm_state_put(xfrm[i]); | |
1613 | goto error; | |
1614 | } | |
1615 | ||
4e81bb83 MN |
1616 | for (pi = 0; pi < npols; pi++) { |
1617 | read_lock_bh(&pols[pi]->lock); | |
1618 | pol_dead |= pols[pi]->dead; | |
1619 | read_unlock_bh(&pols[pi]->lock); | |
1620 | } | |
1621 | ||
1da177e4 | 1622 | write_lock_bh(&policy->lock); |
4e81bb83 | 1623 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1624 | /* Wow! While we worked on resolving, this |
1625 | * policy has gone. Retry. It is not paranoia, | |
1626 | * we just cannot enlist new bundle to dead object. | |
1627 | * We can't enlist stable bundles either. | |
1628 | */ | |
1629 | write_unlock_bh(&policy->lock); | |
1da177e4 LT |
1630 | if (dst) |
1631 | dst_free(dst); | |
00de651d HX |
1632 | |
1633 | err = -EHOSTUNREACH; | |
1634 | goto error; | |
1da177e4 | 1635 | } |
157bfc25 MN |
1636 | |
1637 | if (npols > 1) | |
1638 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1639 | else | |
1640 | err = xfrm_dst_update_origin(dst, fl); | |
1641 | if (unlikely(err)) { | |
1642 | write_unlock_bh(&policy->lock); | |
1643 | if (dst) | |
1644 | dst_free(dst); | |
1645 | goto error; | |
1646 | } | |
1647 | ||
1da177e4 LT |
1648 | dst->next = policy->bundles; |
1649 | policy->bundles = dst; | |
1650 | dst_hold(dst); | |
1651 | write_unlock_bh(&policy->lock); | |
1652 | } | |
1653 | *dst_p = dst; | |
1654 | dst_release(dst_orig); | |
a716c119 | 1655 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1656 | return 0; |
1657 | ||
1658 | error: | |
1659 | dst_release(dst_orig); | |
4e81bb83 | 1660 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1661 | *dst_p = NULL; |
1662 | return err; | |
1663 | } | |
14e50e57 DM |
1664 | EXPORT_SYMBOL(__xfrm_lookup); |
1665 | ||
1666 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1667 | struct sock *sk, int flags) | |
1668 | { | |
1669 | int err = __xfrm_lookup(dst_p, fl, sk, flags); | |
1670 | ||
1671 | if (err == -EREMOTE) { | |
1672 | dst_release(*dst_p); | |
1673 | *dst_p = NULL; | |
1674 | err = -EAGAIN; | |
1675 | } | |
1676 | ||
1677 | return err; | |
1678 | } | |
1da177e4 LT |
1679 | EXPORT_SYMBOL(xfrm_lookup); |
1680 | ||
df0ba92a MN |
1681 | static inline int |
1682 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1683 | { | |
1684 | struct xfrm_state *x; | |
1685 | int err; | |
1686 | ||
1687 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1688 | return 0; | |
1689 | x = skb->sp->xvec[idx]; | |
1690 | if (!x->type->reject) | |
1691 | return 0; | |
1692 | xfrm_state_hold(x); | |
1693 | err = x->type->reject(x, skb, fl); | |
1694 | xfrm_state_put(x); | |
1695 | return err; | |
1696 | } | |
1697 | ||
1da177e4 LT |
1698 | /* When skb is transformed back to its "native" form, we have to |
1699 | * check policy restrictions. At the moment we make this in maximally | |
1700 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1701 | * have policy cached at them. | |
1702 | */ | |
1703 | ||
1704 | static inline int | |
a716c119 | 1705 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1706 | unsigned short family) |
1707 | { | |
1708 | if (xfrm_state_kern(x)) | |
928ba416 | 1709 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1710 | return x->id.proto == tmpl->id.proto && |
1711 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1712 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1713 | x->props.mode == tmpl->mode && | |
f3bd4840 MN |
1714 | ((tmpl->aalgos & (1<<x->props.aalgo)) || |
1715 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && | |
7e49e6de MN |
1716 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1717 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1718 | } |
1719 | ||
df0ba92a MN |
1720 | /* |
1721 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1722 | * because of optional transport mode, or next index of the mathced secpath | |
1723 | * state with the template. | |
1724 | * -1 is returned when no matching template is found. | |
1725 | * Otherwise "-2 - errored_index" is returned. | |
1726 | */ | |
1da177e4 LT |
1727 | static inline int |
1728 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1729 | unsigned short family) | |
1730 | { | |
1731 | int idx = start; | |
1732 | ||
1733 | if (tmpl->optional) { | |
7e49e6de | 1734 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1735 | return start; |
1736 | } else | |
1737 | start = -1; | |
1738 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1739 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1740 | return ++idx; |
df0ba92a MN |
1741 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1742 | if (start == -1) | |
1743 | start = -2-idx; | |
1da177e4 | 1744 | break; |
df0ba92a | 1745 | } |
1da177e4 LT |
1746 | } |
1747 | return start; | |
1748 | } | |
1749 | ||
3e3850e9 PM |
1750 | int |
1751 | xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family) | |
1da177e4 LT |
1752 | { |
1753 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1754 | int err; |
1da177e4 LT |
1755 | |
1756 | if (unlikely(afinfo == NULL)) | |
1757 | return -EAFNOSUPPORT; | |
1758 | ||
1759 | afinfo->decode_session(skb, fl); | |
beb8d13b | 1760 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1761 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1762 | return err; |
1da177e4 | 1763 | } |
3e3850e9 | 1764 | EXPORT_SYMBOL(xfrm_decode_session); |
1da177e4 | 1765 | |
df0ba92a | 1766 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1767 | { |
1768 | for (; k < sp->len; k++) { | |
df0ba92a | 1769 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1770 | *idxp = k; |
1da177e4 | 1771 | return 1; |
df0ba92a | 1772 | } |
1da177e4 LT |
1773 | } |
1774 | ||
1775 | return 0; | |
1776 | } | |
1777 | ||
a716c119 | 1778 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1779 | unsigned short family) |
1780 | { | |
1781 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1782 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1783 | int npols = 0; | |
1784 | int xfrm_nr; | |
1785 | int pi; | |
1da177e4 | 1786 | struct flowi fl; |
df71837d | 1787 | u8 fl_dir = policy_to_flow_dir(dir); |
df0ba92a | 1788 | int xerr_idx = -1; |
1da177e4 | 1789 | |
3e3850e9 | 1790 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 | 1791 | return 0; |
eb9c7ebe | 1792 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1793 | |
1794 | /* First, check used SA against their selectors. */ | |
1795 | if (skb->sp) { | |
1796 | int i; | |
1797 | ||
1798 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa HX |
1799 | struct xfrm_state *x = skb->sp->xvec[i]; |
1800 | if (!xfrm_selector_match(&x->sel, &fl, family)) | |
1da177e4 | 1801 | return 0; |
1da177e4 LT |
1802 | } |
1803 | } | |
1804 | ||
1805 | pol = NULL; | |
3bccfbc7 | 1806 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1807 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
3bccfbc7 VY |
1808 | if (IS_ERR(pol)) |
1809 | return 0; | |
1810 | } | |
1da177e4 LT |
1811 | |
1812 | if (!pol) | |
e0d1caa7 | 1813 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1814 | xfrm_policy_lookup); |
1815 | ||
134b0fc5 JM |
1816 | if (IS_ERR(pol)) |
1817 | return 0; | |
1818 | ||
df0ba92a | 1819 | if (!pol) { |
d1d9facf | 1820 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a MN |
1821 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
1822 | return 0; | |
1823 | } | |
1824 | return 1; | |
1825 | } | |
1da177e4 | 1826 | |
9d729f72 | 1827 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1828 | |
4e81bb83 MN |
1829 | pols[0] = pol; |
1830 | npols ++; | |
1831 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1832 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1833 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1834 | &fl, family, | |
1835 | XFRM_POLICY_IN); | |
1836 | if (pols[1]) { | |
134b0fc5 JM |
1837 | if (IS_ERR(pols[1])) |
1838 | return 0; | |
9d729f72 | 1839 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1840 | npols ++; |
1841 | } | |
1842 | } | |
1843 | #endif | |
1844 | ||
1da177e4 LT |
1845 | if (pol->action == XFRM_POLICY_ALLOW) { |
1846 | struct sec_path *sp; | |
1847 | static struct sec_path dummy; | |
4e81bb83 | 1848 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1849 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1850 | struct xfrm_tmpl **tpp = tp; |
1851 | int ti = 0; | |
1da177e4 LT |
1852 | int i, k; |
1853 | ||
1854 | if ((sp = skb->sp) == NULL) | |
1855 | sp = &dummy; | |
1856 | ||
4e81bb83 MN |
1857 | for (pi = 0; pi < npols; pi++) { |
1858 | if (pols[pi] != pol && | |
1859 | pols[pi]->action != XFRM_POLICY_ALLOW) | |
1860 | goto reject; | |
1861 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) | |
1862 | goto reject_error; | |
1863 | for (i = 0; i < pols[pi]->xfrm_nr; i++) | |
1864 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1865 | } | |
1866 | xfrm_nr = ti; | |
41a49cc3 MN |
1867 | if (npols > 1) { |
1868 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
1869 | tpp = stp; | |
1870 | } | |
4e81bb83 | 1871 | |
1da177e4 LT |
1872 | /* For each tunnel xfrm, find the first matching tmpl. |
1873 | * For each tmpl before that, find corresponding xfrm. | |
1874 | * Order is _important_. Later we will implement | |
1875 | * some barriers, but at the moment barriers | |
1876 | * are implied between each two transformations. | |
1877 | */ | |
4e81bb83 MN |
1878 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
1879 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 1880 | if (k < 0) { |
d1d9facf JM |
1881 | if (k < -1) |
1882 | /* "-2 - errored_index" returned */ | |
1883 | xerr_idx = -(2+k); | |
1da177e4 | 1884 | goto reject; |
df0ba92a | 1885 | } |
1da177e4 LT |
1886 | } |
1887 | ||
d1d9facf | 1888 | if (secpath_has_nontransport(sp, k, &xerr_idx)) |
1da177e4 LT |
1889 | goto reject; |
1890 | ||
4e81bb83 | 1891 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1892 | return 1; |
1893 | } | |
1894 | ||
1895 | reject: | |
df0ba92a | 1896 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
1897 | reject_error: |
1898 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
1899 | return 0; |
1900 | } | |
1901 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1902 | ||
1903 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1904 | { | |
1905 | struct flowi fl; | |
1906 | ||
3e3850e9 | 1907 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 LT |
1908 | return 0; |
1909 | ||
1910 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1911 | } | |
1912 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1913 | ||
d49c73c7 DM |
1914 | /* Optimize later using cookies and generation ids. */ |
1915 | ||
1da177e4 LT |
1916 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1917 | { | |
d49c73c7 DM |
1918 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
1919 | * to "-1" to force all XFRM destinations to get validated by | |
1920 | * dst_ops->check on every use. We do this because when a | |
1921 | * normal route referenced by an XFRM dst is obsoleted we do | |
1922 | * not go looking around for all parent referencing XFRM dsts | |
1923 | * so that we can invalidate them. It is just too much work. | |
1924 | * Instead we make the checks here on every use. For example: | |
1925 | * | |
1926 | * XFRM dst A --> IPv4 dst X | |
1927 | * | |
1928 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
1929 | * in this example). If X is marked obsolete, "A" will not | |
1930 | * notice. That's what we are validating here via the | |
1931 | * stale_bundle() check. | |
1932 | * | |
1933 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
1934 | * dst which causes it's ->obsolete field to be set to a | |
1935 | * positive non-zero integer. If an XFRM dst has been pruned | |
1936 | * like this, we want to force a new route lookup. | |
399c180a | 1937 | */ |
d49c73c7 DM |
1938 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
1939 | return dst; | |
1940 | ||
1da177e4 LT |
1941 | return NULL; |
1942 | } | |
1943 | ||
1944 | static int stale_bundle(struct dst_entry *dst) | |
1945 | { | |
5b368e61 | 1946 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
1947 | } |
1948 | ||
aabc9761 | 1949 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 1950 | { |
1da177e4 | 1951 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
2774c7ab | 1952 | dst->dev = init_net.loopback_dev; |
de3cb747 | 1953 | dev_hold(dst->dev); |
1da177e4 LT |
1954 | dev_put(dev); |
1955 | } | |
1956 | } | |
aabc9761 | 1957 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
1958 | |
1959 | static void xfrm_link_failure(struct sk_buff *skb) | |
1960 | { | |
1961 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1962 | return; | |
1963 | } | |
1964 | ||
1965 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
1966 | { | |
1967 | if (dst) { | |
1968 | if (dst->obsolete) { | |
1969 | dst_release(dst); | |
1970 | dst = NULL; | |
1971 | } | |
1972 | } | |
1973 | return dst; | |
1974 | } | |
1975 | ||
2518c7c2 DM |
1976 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
1977 | { | |
1978 | struct dst_entry *dst, **dstp; | |
1979 | ||
1980 | write_lock(&pol->lock); | |
1981 | dstp = &pol->bundles; | |
1982 | while ((dst=*dstp) != NULL) { | |
1983 | if (func(dst)) { | |
1984 | *dstp = dst->next; | |
1985 | dst->next = *gc_list_p; | |
1986 | *gc_list_p = dst; | |
1987 | } else { | |
1988 | dstp = &dst->next; | |
1989 | } | |
1990 | } | |
1991 | write_unlock(&pol->lock); | |
1992 | } | |
1993 | ||
1da177e4 LT |
1994 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
1995 | { | |
2518c7c2 DM |
1996 | struct dst_entry *gc_list = NULL; |
1997 | int dir; | |
1da177e4 LT |
1998 | |
1999 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2000 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2001 | struct xfrm_policy *pol; | |
2002 | struct hlist_node *entry; | |
2003 | struct hlist_head *table; | |
2004 | int i; | |
4e81bb83 | 2005 | |
2518c7c2 DM |
2006 | hlist_for_each_entry(pol, entry, |
2007 | &xfrm_policy_inexact[dir], bydst) | |
2008 | prune_one_bundle(pol, func, &gc_list); | |
2009 | ||
2010 | table = xfrm_policy_bydst[dir].table; | |
2011 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
2012 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
2013 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2014 | } |
2015 | } | |
2016 | read_unlock_bh(&xfrm_policy_lock); | |
2017 | ||
2018 | while (gc_list) { | |
2518c7c2 | 2019 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2020 | gc_list = dst->next; |
2021 | dst_free(dst); | |
2022 | } | |
2023 | } | |
2024 | ||
2025 | static int unused_bundle(struct dst_entry *dst) | |
2026 | { | |
2027 | return !atomic_read(&dst->__refcnt); | |
2028 | } | |
2029 | ||
2030 | static void __xfrm_garbage_collect(void) | |
2031 | { | |
2032 | xfrm_prune_bundles(unused_bundle); | |
2033 | } | |
2034 | ||
1c095399 | 2035 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
2036 | { |
2037 | xfrm_prune_bundles(stale_bundle); | |
2038 | return 0; | |
2039 | } | |
2040 | ||
2041 | void xfrm_init_pmtu(struct dst_entry *dst) | |
2042 | { | |
2043 | do { | |
2044 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2045 | u32 pmtu, route_mtu_cached; | |
2046 | ||
2047 | pmtu = dst_mtu(dst->child); | |
2048 | xdst->child_mtu_cached = pmtu; | |
2049 | ||
2050 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2051 | ||
2052 | route_mtu_cached = dst_mtu(xdst->route); | |
2053 | xdst->route_mtu_cached = route_mtu_cached; | |
2054 | ||
2055 | if (pmtu > route_mtu_cached) | |
2056 | pmtu = route_mtu_cached; | |
2057 | ||
2058 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2059 | } while ((dst = dst->next)); | |
2060 | } | |
2061 | ||
2062 | EXPORT_SYMBOL(xfrm_init_pmtu); | |
2063 | ||
2064 | /* Check that the bundle accepts the flow and its components are | |
2065 | * still valid. | |
2066 | */ | |
2067 | ||
5b368e61 VY |
2068 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2069 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2070 | { |
2071 | struct dst_entry *dst = &first->u.dst; | |
2072 | struct xfrm_dst *last; | |
2073 | u32 mtu; | |
2074 | ||
92d63dec | 2075 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2076 | (dst->dev && !netif_running(dst->dev))) |
2077 | return 0; | |
157bfc25 MN |
2078 | #ifdef CONFIG_XFRM_SUB_POLICY |
2079 | if (fl) { | |
2080 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2081 | return 0; | |
2082 | if (first->partner && | |
2083 | !xfrm_selector_match(first->partner, fl, family)) | |
2084 | return 0; | |
2085 | } | |
2086 | #endif | |
1da177e4 LT |
2087 | |
2088 | last = NULL; | |
2089 | ||
2090 | do { | |
2091 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2092 | ||
2093 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2094 | return 0; | |
67f83cbf VY |
2095 | if (fl && pol && |
2096 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2097 | return 0; |
1da177e4 LT |
2098 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2099 | return 0; | |
9d4a706d DM |
2100 | if (xdst->genid != dst->xfrm->genid) |
2101 | return 0; | |
e53820de MN |
2102 | |
2103 | if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL && | |
2104 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) | |
2105 | return 0; | |
1da177e4 LT |
2106 | |
2107 | mtu = dst_mtu(dst->child); | |
2108 | if (xdst->child_mtu_cached != mtu) { | |
2109 | last = xdst; | |
2110 | xdst->child_mtu_cached = mtu; | |
2111 | } | |
2112 | ||
92d63dec | 2113 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2114 | return 0; |
2115 | mtu = dst_mtu(xdst->route); | |
2116 | if (xdst->route_mtu_cached != mtu) { | |
2117 | last = xdst; | |
2118 | xdst->route_mtu_cached = mtu; | |
2119 | } | |
2120 | ||
2121 | dst = dst->child; | |
2122 | } while (dst->xfrm); | |
2123 | ||
2124 | if (likely(!last)) | |
2125 | return 1; | |
2126 | ||
2127 | mtu = last->child_mtu_cached; | |
2128 | for (;;) { | |
2129 | dst = &last->u.dst; | |
2130 | ||
2131 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2132 | if (mtu > last->route_mtu_cached) | |
2133 | mtu = last->route_mtu_cached; | |
2134 | dst->metrics[RTAX_MTU-1] = mtu; | |
2135 | ||
2136 | if (last == first) | |
2137 | break; | |
2138 | ||
bd0bf076 | 2139 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2140 | last->child_mtu_cached = mtu; |
2141 | } | |
2142 | ||
2143 | return 1; | |
2144 | } | |
2145 | ||
2146 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2147 | ||
1da177e4 LT |
2148 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2149 | { | |
2150 | int err = 0; | |
2151 | if (unlikely(afinfo == NULL)) | |
2152 | return -EINVAL; | |
2153 | if (unlikely(afinfo->family >= NPROTO)) | |
2154 | return -EAFNOSUPPORT; | |
e959d812 | 2155 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2156 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2157 | err = -ENOBUFS; | |
2158 | else { | |
2159 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2160 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2161 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2162 | if (likely(dst_ops->check == NULL)) | |
2163 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2164 | if (likely(dst_ops->negative_advice == NULL)) |
2165 | dst_ops->negative_advice = xfrm_negative_advice; | |
2166 | if (likely(dst_ops->link_failure == NULL)) | |
2167 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2168 | if (likely(afinfo->garbage_collect == NULL)) |
2169 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2170 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2171 | } | |
e959d812 | 2172 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2173 | return err; |
2174 | } | |
2175 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2176 | ||
2177 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2178 | { | |
2179 | int err = 0; | |
2180 | if (unlikely(afinfo == NULL)) | |
2181 | return -EINVAL; | |
2182 | if (unlikely(afinfo->family >= NPROTO)) | |
2183 | return -EAFNOSUPPORT; | |
e959d812 | 2184 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2185 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2186 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2187 | err = -EINVAL; | |
2188 | else { | |
2189 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2190 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2191 | dst_ops->kmem_cachep = NULL; | |
2192 | dst_ops->check = NULL; | |
1da177e4 LT |
2193 | dst_ops->negative_advice = NULL; |
2194 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2195 | afinfo->garbage_collect = NULL; |
2196 | } | |
2197 | } | |
e959d812 | 2198 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2199 | return err; |
2200 | } | |
2201 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2202 | ||
2203 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2204 | { | |
2205 | struct xfrm_policy_afinfo *afinfo; | |
2206 | if (unlikely(family >= NPROTO)) | |
2207 | return NULL; | |
2208 | read_lock(&xfrm_policy_afinfo_lock); | |
2209 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2210 | if (unlikely(!afinfo)) |
2211 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2212 | return afinfo; |
2213 | } | |
2214 | ||
2215 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2216 | { | |
546be240 HX |
2217 | read_unlock(&xfrm_policy_afinfo_lock); |
2218 | } | |
2219 | ||
2220 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family) | |
2221 | { | |
2222 | struct xfrm_policy_afinfo *afinfo; | |
2223 | if (unlikely(family >= NPROTO)) | |
2224 | return NULL; | |
2225 | write_lock_bh(&xfrm_policy_afinfo_lock); | |
2226 | afinfo = xfrm_policy_afinfo[family]; | |
2227 | if (unlikely(!afinfo)) | |
2228 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
2229 | return afinfo; | |
2230 | } | |
2231 | ||
2232 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2233 | { | |
2234 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2235 | } |
2236 | ||
2237 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
2238 | { | |
e9dc8653 EB |
2239 | struct net_device *dev = ptr; |
2240 | ||
2241 | if (dev->nd_net != &init_net) | |
2242 | return NOTIFY_DONE; | |
2243 | ||
1da177e4 LT |
2244 | switch (event) { |
2245 | case NETDEV_DOWN: | |
2246 | xfrm_flush_bundles(); | |
2247 | } | |
2248 | return NOTIFY_DONE; | |
2249 | } | |
2250 | ||
2251 | static struct notifier_block xfrm_dev_notifier = { | |
2252 | xfrm_dev_event, | |
2253 | NULL, | |
2254 | 0 | |
2255 | }; | |
2256 | ||
2257 | static void __init xfrm_policy_init(void) | |
2258 | { | |
2518c7c2 DM |
2259 | unsigned int hmask, sz; |
2260 | int dir; | |
2261 | ||
1da177e4 LT |
2262 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2263 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2264 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2265 | NULL); |
1da177e4 | 2266 | |
2518c7c2 DM |
2267 | hmask = 8 - 1; |
2268 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2269 | ||
44e36b42 | 2270 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2271 | xfrm_idx_hmask = hmask; |
2272 | if (!xfrm_policy_byidx) | |
2273 | panic("XFRM: failed to allocate byidx hash\n"); | |
2274 | ||
2275 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2276 | struct xfrm_policy_hash *htab; | |
2277 | ||
2278 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2279 | ||
2280 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2281 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2282 | htab->hmask = hmask; |
2283 | if (!htab->table) | |
2284 | panic("XFRM: failed to allocate bydst hash\n"); | |
2285 | } | |
2286 | ||
c4028958 | 2287 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2288 | register_netdevice_notifier(&xfrm_dev_notifier); |
2289 | } | |
2290 | ||
2291 | void __init xfrm_init(void) | |
2292 | { | |
2293 | xfrm_state_init(); | |
2294 | xfrm_policy_init(); | |
2295 | xfrm_input_init(); | |
2296 | } | |
2297 | ||
ab5f5e8b JL |
2298 | #ifdef CONFIG_AUDITSYSCALL |
2299 | static inline void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, | |
2300 | struct audit_buffer *audit_buf) | |
2301 | { | |
2302 | if (xp->security) | |
2303 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", | |
2304 | xp->security->ctx_alg, xp->security->ctx_doi, | |
2305 | xp->security->ctx_str); | |
2306 | ||
2307 | switch(xp->selector.family) { | |
2308 | case AF_INET: | |
2309 | audit_log_format(audit_buf, " src=%u.%u.%u.%u dst=%u.%u.%u.%u", | |
2310 | NIPQUAD(xp->selector.saddr.a4), | |
2311 | NIPQUAD(xp->selector.daddr.a4)); | |
2312 | break; | |
2313 | case AF_INET6: | |
2314 | { | |
2315 | struct in6_addr saddr6, daddr6; | |
2316 | ||
2317 | memcpy(&saddr6, xp->selector.saddr.a6, | |
2318 | sizeof(struct in6_addr)); | |
2319 | memcpy(&daddr6, xp->selector.daddr.a6, | |
2320 | sizeof(struct in6_addr)); | |
2321 | audit_log_format(audit_buf, | |
2322 | " src=" NIP6_FMT " dst=" NIP6_FMT, | |
2323 | NIP6(saddr6), NIP6(daddr6)); | |
2324 | } | |
2325 | break; | |
2326 | } | |
2327 | } | |
2328 | ||
2329 | void | |
2330 | xfrm_audit_policy_add(struct xfrm_policy *xp, int result, u32 auid, u32 sid) | |
2331 | { | |
2332 | struct audit_buffer *audit_buf; | |
2333 | extern int audit_enabled; | |
2334 | ||
2335 | if (audit_enabled == 0) | |
2336 | return; | |
2337 | audit_buf = xfrm_audit_start(sid, auid); | |
2338 | if (audit_buf == NULL) | |
2339 | return; | |
2340 | audit_log_format(audit_buf, " op=SPD-add res=%u", result); | |
2341 | xfrm_audit_common_policyinfo(xp, audit_buf); | |
2342 | audit_log_end(audit_buf); | |
2343 | } | |
2344 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2345 | ||
2346 | void | |
2347 | xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, u32 auid, u32 sid) | |
2348 | { | |
2349 | struct audit_buffer *audit_buf; | |
2350 | extern int audit_enabled; | |
2351 | ||
2352 | if (audit_enabled == 0) | |
2353 | return; | |
2354 | audit_buf = xfrm_audit_start(sid, auid); | |
2355 | if (audit_buf == NULL) | |
2356 | return; | |
2357 | audit_log_format(audit_buf, " op=SPD-delete res=%u", result); | |
2358 | xfrm_audit_common_policyinfo(xp, audit_buf); | |
2359 | audit_log_end(audit_buf); | |
2360 | } | |
2361 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2362 | #endif | |
2363 | ||
80c9abaa SS |
2364 | #ifdef CONFIG_XFRM_MIGRATE |
2365 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2366 | struct xfrm_selector *sel_tgt) | |
2367 | { | |
2368 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2369 | if (sel_tgt->family == sel_cmp->family && | |
2370 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2371 | sel_cmp->family) == 0 && |
80c9abaa SS |
2372 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2373 | sel_cmp->family) == 0 && | |
2374 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2375 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2376 | return 1; | |
2377 | } | |
2378 | } else { | |
2379 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2380 | return 1; | |
2381 | } | |
2382 | } | |
2383 | return 0; | |
2384 | } | |
2385 | ||
2386 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2387 | u8 dir, u8 type) | |
2388 | { | |
2389 | struct xfrm_policy *pol, *ret = NULL; | |
2390 | struct hlist_node *entry; | |
2391 | struct hlist_head *chain; | |
2392 | u32 priority = ~0U; | |
2393 | ||
2394 | read_lock_bh(&xfrm_policy_lock); | |
2395 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2396 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2397 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2398 | pol->type == type) { | |
2399 | ret = pol; | |
2400 | priority = ret->priority; | |
2401 | break; | |
2402 | } | |
2403 | } | |
2404 | chain = &xfrm_policy_inexact[dir]; | |
2405 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2406 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2407 | pol->type == type && | |
2408 | pol->priority < priority) { | |
2409 | ret = pol; | |
2410 | break; | |
2411 | } | |
2412 | } | |
2413 | ||
2414 | if (ret) | |
2415 | xfrm_pol_hold(ret); | |
2416 | ||
2417 | read_unlock_bh(&xfrm_policy_lock); | |
2418 | ||
2419 | return ret; | |
2420 | } | |
2421 | ||
2422 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2423 | { | |
2424 | int match = 0; | |
2425 | ||
2426 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2427 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2428 | switch (t->mode) { | |
2429 | case XFRM_MODE_TUNNEL: | |
2430 | case XFRM_MODE_BEET: | |
2431 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2432 | m->old_family) == 0 && | |
2433 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2434 | m->old_family) == 0) { | |
2435 | match = 1; | |
2436 | } | |
2437 | break; | |
2438 | case XFRM_MODE_TRANSPORT: | |
2439 | /* in case of transport mode, template does not store | |
2440 | any IP addresses, hence we just compare mode and | |
2441 | protocol */ | |
2442 | match = 1; | |
2443 | break; | |
2444 | default: | |
2445 | break; | |
2446 | } | |
2447 | } | |
2448 | return match; | |
2449 | } | |
2450 | ||
2451 | /* update endpoint address(es) of template(s) */ | |
2452 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2453 | struct xfrm_migrate *m, int num_migrate) | |
2454 | { | |
2455 | struct xfrm_migrate *mp; | |
2456 | struct dst_entry *dst; | |
2457 | int i, j, n = 0; | |
2458 | ||
2459 | write_lock_bh(&pol->lock); | |
2460 | if (unlikely(pol->dead)) { | |
2461 | /* target policy has been deleted */ | |
2462 | write_unlock_bh(&pol->lock); | |
2463 | return -ENOENT; | |
2464 | } | |
2465 | ||
2466 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2467 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2468 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2469 | continue; | |
2470 | n++; | |
2471 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL) | |
2472 | continue; | |
2473 | /* update endpoints */ | |
2474 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2475 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2476 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2477 | sizeof(pol->xfrm_vec[i].saddr)); | |
2478 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2479 | /* flush bundles */ | |
2480 | while ((dst = pol->bundles) != NULL) { | |
2481 | pol->bundles = dst->next; | |
2482 | dst_free(dst); | |
2483 | } | |
2484 | } | |
2485 | } | |
2486 | ||
2487 | write_unlock_bh(&pol->lock); | |
2488 | ||
2489 | if (!n) | |
2490 | return -ENODATA; | |
2491 | ||
2492 | return 0; | |
2493 | } | |
2494 | ||
2495 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2496 | { | |
2497 | int i, j; | |
2498 | ||
2499 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2500 | return -EINVAL; | |
2501 | ||
2502 | for (i = 0; i < num_migrate; i++) { | |
2503 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2504 | m[i].old_family) == 0) && | |
2505 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2506 | m[i].old_family) == 0)) | |
2507 | return -EINVAL; | |
2508 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2509 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2510 | return -EINVAL; | |
2511 | ||
2512 | /* check if there is any duplicated entry */ | |
2513 | for (j = i + 1; j < num_migrate; j++) { | |
2514 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2515 | sizeof(m[i].old_daddr)) && | |
2516 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2517 | sizeof(m[i].old_saddr)) && | |
2518 | m[i].proto == m[j].proto && | |
2519 | m[i].mode == m[j].mode && | |
2520 | m[i].reqid == m[j].reqid && | |
2521 | m[i].old_family == m[j].old_family) | |
2522 | return -EINVAL; | |
2523 | } | |
2524 | } | |
2525 | ||
2526 | return 0; | |
2527 | } | |
2528 | ||
2529 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
2530 | struct xfrm_migrate *m, int num_migrate) | |
2531 | { | |
2532 | int i, err, nx_cur = 0, nx_new = 0; | |
2533 | struct xfrm_policy *pol = NULL; | |
2534 | struct xfrm_state *x, *xc; | |
2535 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2536 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2537 | struct xfrm_migrate *mp; | |
2538 | ||
2539 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2540 | goto out; | |
2541 | ||
2542 | /* Stage 1 - find policy */ | |
2543 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2544 | err = -ENOENT; | |
2545 | goto out; | |
2546 | } | |
2547 | ||
2548 | /* Stage 2 - find and update state(s) */ | |
2549 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2550 | if ((x = xfrm_migrate_state_find(mp))) { | |
2551 | x_cur[nx_cur] = x; | |
2552 | nx_cur++; | |
2553 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2554 | x_new[nx_new] = xc; | |
2555 | nx_new++; | |
2556 | } else { | |
2557 | err = -ENODATA; | |
2558 | goto restore_state; | |
2559 | } | |
2560 | } | |
2561 | } | |
2562 | ||
2563 | /* Stage 3 - update policy */ | |
2564 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2565 | goto restore_state; | |
2566 | ||
2567 | /* Stage 4 - delete old state(s) */ | |
2568 | if (nx_cur) { | |
2569 | xfrm_states_put(x_cur, nx_cur); | |
2570 | xfrm_states_delete(x_cur, nx_cur); | |
2571 | } | |
2572 | ||
2573 | /* Stage 5 - announce */ | |
2574 | km_migrate(sel, dir, type, m, num_migrate); | |
2575 | ||
2576 | xfrm_pol_put(pol); | |
2577 | ||
2578 | return 0; | |
2579 | out: | |
2580 | return err; | |
2581 | ||
2582 | restore_state: | |
2583 | if (pol) | |
2584 | xfrm_pol_put(pol); | |
2585 | if (nx_cur) | |
2586 | xfrm_states_put(x_cur, nx_cur); | |
2587 | if (nx_new) | |
2588 | xfrm_states_delete(x_new, nx_new); | |
2589 | ||
2590 | return err; | |
2591 | } | |
e610e679 | 2592 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2593 | #endif |