Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * xfrm_policy.c | |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * Kazunori MIYAZAWA @USAGI | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor | |
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 | ||
4a3e2f71 AV |
31 | DEFINE_MUTEX(xfrm_cfg_mutex); |
32 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 LT |
33 | |
34 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
35 | ||
2518c7c2 DM |
36 | unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
37 | EXPORT_SYMBOL(xfrm_policy_count); | |
1da177e4 LT |
38 | |
39 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
40 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
41 | ||
ba89966c | 42 | static kmem_cache_t *xfrm_dst_cache __read_mostly; |
1da177e4 LT |
43 | |
44 | static struct work_struct xfrm_policy_gc_work; | |
2518c7c2 | 45 | static HLIST_HEAD(xfrm_policy_gc_list); |
1da177e4 LT |
46 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
47 | ||
48 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
49 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
546be240 HX |
50 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family); |
51 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo); | |
1da177e4 | 52 | |
77681021 AM |
53 | static inline int |
54 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
55 | { | |
56 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
57 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
58 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
59 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
60 | (fl->proto == sel->proto || !sel->proto) && | |
61 | (fl->oif == sel->ifindex || !sel->ifindex); | |
62 | } | |
63 | ||
64 | static inline int | |
65 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
66 | { | |
67 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
68 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
69 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
70 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
71 | (fl->proto == sel->proto || !sel->proto) && | |
72 | (fl->oif == sel->ifindex || !sel->ifindex); | |
73 | } | |
74 | ||
75 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
76 | unsigned short family) | |
77 | { | |
78 | switch (family) { | |
79 | case AF_INET: | |
80 | return __xfrm4_selector_match(sel, fl); | |
81 | case AF_INET6: | |
82 | return __xfrm6_selector_match(sel, fl); | |
83 | } | |
84 | return 0; | |
85 | } | |
86 | ||
1da177e4 LT |
87 | int xfrm_register_type(struct xfrm_type *type, unsigned short family) |
88 | { | |
546be240 HX |
89 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family); |
90 | struct xfrm_type **typemap; | |
1da177e4 LT |
91 | int err = 0; |
92 | ||
93 | if (unlikely(afinfo == NULL)) | |
94 | return -EAFNOSUPPORT; | |
95 | typemap = afinfo->type_map; | |
96 | ||
546be240 HX |
97 | if (likely(typemap[type->proto] == NULL)) |
98 | typemap[type->proto] = type; | |
1da177e4 LT |
99 | else |
100 | err = -EEXIST; | |
546be240 | 101 | xfrm_policy_unlock_afinfo(afinfo); |
1da177e4 LT |
102 | return err; |
103 | } | |
104 | EXPORT_SYMBOL(xfrm_register_type); | |
105 | ||
106 | int xfrm_unregister_type(struct xfrm_type *type, unsigned short family) | |
107 | { | |
546be240 HX |
108 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family); |
109 | struct xfrm_type **typemap; | |
1da177e4 LT |
110 | int err = 0; |
111 | ||
112 | if (unlikely(afinfo == NULL)) | |
113 | return -EAFNOSUPPORT; | |
114 | typemap = afinfo->type_map; | |
115 | ||
546be240 | 116 | if (unlikely(typemap[type->proto] != type)) |
1da177e4 LT |
117 | err = -ENOENT; |
118 | else | |
546be240 HX |
119 | typemap[type->proto] = NULL; |
120 | xfrm_policy_unlock_afinfo(afinfo); | |
1da177e4 LT |
121 | return err; |
122 | } | |
123 | EXPORT_SYMBOL(xfrm_unregister_type); | |
124 | ||
125 | struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) | |
126 | { | |
127 | struct xfrm_policy_afinfo *afinfo; | |
546be240 | 128 | struct xfrm_type **typemap; |
1da177e4 LT |
129 | struct xfrm_type *type; |
130 | int modload_attempted = 0; | |
131 | ||
132 | retry: | |
133 | afinfo = xfrm_policy_get_afinfo(family); | |
134 | if (unlikely(afinfo == NULL)) | |
135 | return NULL; | |
136 | typemap = afinfo->type_map; | |
137 | ||
546be240 | 138 | type = typemap[proto]; |
1da177e4 LT |
139 | if (unlikely(type && !try_module_get(type->owner))) |
140 | type = NULL; | |
1da177e4 LT |
141 | if (!type && !modload_attempted) { |
142 | xfrm_policy_put_afinfo(afinfo); | |
143 | request_module("xfrm-type-%d-%d", | |
144 | (int) family, (int) proto); | |
145 | modload_attempted = 1; | |
146 | goto retry; | |
147 | } | |
148 | ||
149 | xfrm_policy_put_afinfo(afinfo); | |
150 | return type; | |
151 | } | |
1da177e4 LT |
152 | |
153 | int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, | |
154 | unsigned short family) | |
155 | { | |
156 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
157 | int err = 0; | |
158 | ||
159 | if (unlikely(afinfo == NULL)) | |
160 | return -EAFNOSUPPORT; | |
161 | ||
162 | if (likely(afinfo->dst_lookup != NULL)) | |
163 | err = afinfo->dst_lookup(dst, fl); | |
164 | else | |
165 | err = -EINVAL; | |
166 | xfrm_policy_put_afinfo(afinfo); | |
167 | return err; | |
168 | } | |
169 | EXPORT_SYMBOL(xfrm_dst_lookup); | |
170 | ||
171 | void xfrm_put_type(struct xfrm_type *type) | |
172 | { | |
173 | module_put(type->owner); | |
174 | } | |
175 | ||
b59f45d0 HX |
176 | int xfrm_register_mode(struct xfrm_mode *mode, int family) |
177 | { | |
178 | struct xfrm_policy_afinfo *afinfo; | |
179 | struct xfrm_mode **modemap; | |
180 | int err; | |
181 | ||
182 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
183 | return -EINVAL; | |
184 | ||
185 | afinfo = xfrm_policy_lock_afinfo(family); | |
186 | if (unlikely(afinfo == NULL)) | |
187 | return -EAFNOSUPPORT; | |
188 | ||
189 | err = -EEXIST; | |
190 | modemap = afinfo->mode_map; | |
191 | if (likely(modemap[mode->encap] == NULL)) { | |
192 | modemap[mode->encap] = mode; | |
193 | err = 0; | |
194 | } | |
195 | ||
196 | xfrm_policy_unlock_afinfo(afinfo); | |
197 | return err; | |
198 | } | |
199 | EXPORT_SYMBOL(xfrm_register_mode); | |
200 | ||
201 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
202 | { | |
203 | struct xfrm_policy_afinfo *afinfo; | |
204 | struct xfrm_mode **modemap; | |
205 | int err; | |
206 | ||
207 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
208 | return -EINVAL; | |
209 | ||
210 | afinfo = xfrm_policy_lock_afinfo(family); | |
211 | if (unlikely(afinfo == NULL)) | |
212 | return -EAFNOSUPPORT; | |
213 | ||
214 | err = -ENOENT; | |
215 | modemap = afinfo->mode_map; | |
216 | if (likely(modemap[mode->encap] == mode)) { | |
217 | modemap[mode->encap] = NULL; | |
218 | err = 0; | |
219 | } | |
220 | ||
221 | xfrm_policy_unlock_afinfo(afinfo); | |
222 | return err; | |
223 | } | |
224 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
225 | ||
226 | struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
227 | { | |
228 | struct xfrm_policy_afinfo *afinfo; | |
229 | struct xfrm_mode *mode; | |
230 | int modload_attempted = 0; | |
231 | ||
232 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
233 | return NULL; | |
234 | ||
235 | retry: | |
236 | afinfo = xfrm_policy_get_afinfo(family); | |
237 | if (unlikely(afinfo == NULL)) | |
238 | return NULL; | |
239 | ||
240 | mode = afinfo->mode_map[encap]; | |
241 | if (unlikely(mode && !try_module_get(mode->owner))) | |
242 | mode = NULL; | |
243 | if (!mode && !modload_attempted) { | |
244 | xfrm_policy_put_afinfo(afinfo); | |
245 | request_module("xfrm-mode-%d-%d", family, encap); | |
246 | modload_attempted = 1; | |
247 | goto retry; | |
248 | } | |
249 | ||
250 | xfrm_policy_put_afinfo(afinfo); | |
251 | return mode; | |
252 | } | |
253 | ||
254 | void xfrm_put_mode(struct xfrm_mode *mode) | |
255 | { | |
256 | module_put(mode->owner); | |
257 | } | |
258 | ||
1da177e4 LT |
259 | static inline unsigned long make_jiffies(long secs) |
260 | { | |
261 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
262 | return MAX_SCHEDULE_TIMEOUT-1; | |
263 | else | |
264 | return secs*HZ; | |
265 | } | |
266 | ||
267 | static void xfrm_policy_timer(unsigned long data) | |
268 | { | |
269 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
270 | unsigned long now = (unsigned long)xtime.tv_sec; | |
271 | long next = LONG_MAX; | |
272 | int warn = 0; | |
273 | int dir; | |
274 | ||
275 | read_lock(&xp->lock); | |
276 | ||
277 | if (xp->dead) | |
278 | goto out; | |
279 | ||
77d8d7a6 | 280 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
281 | |
282 | if (xp->lft.hard_add_expires_seconds) { | |
283 | long tmo = xp->lft.hard_add_expires_seconds + | |
284 | xp->curlft.add_time - now; | |
285 | if (tmo <= 0) | |
286 | goto expired; | |
287 | if (tmo < next) | |
288 | next = tmo; | |
289 | } | |
290 | if (xp->lft.hard_use_expires_seconds) { | |
291 | long tmo = xp->lft.hard_use_expires_seconds + | |
292 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
293 | if (tmo <= 0) | |
294 | goto expired; | |
295 | if (tmo < next) | |
296 | next = tmo; | |
297 | } | |
298 | if (xp->lft.soft_add_expires_seconds) { | |
299 | long tmo = xp->lft.soft_add_expires_seconds + | |
300 | xp->curlft.add_time - now; | |
301 | if (tmo <= 0) { | |
302 | warn = 1; | |
303 | tmo = XFRM_KM_TIMEOUT; | |
304 | } | |
305 | if (tmo < next) | |
306 | next = tmo; | |
307 | } | |
308 | if (xp->lft.soft_use_expires_seconds) { | |
309 | long tmo = xp->lft.soft_use_expires_seconds + | |
310 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
311 | if (tmo <= 0) { | |
312 | warn = 1; | |
313 | tmo = XFRM_KM_TIMEOUT; | |
314 | } | |
315 | if (tmo < next) | |
316 | next = tmo; | |
317 | } | |
318 | ||
319 | if (warn) | |
6c5c8ca7 | 320 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
321 | if (next != LONG_MAX && |
322 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
323 | xfrm_pol_hold(xp); | |
324 | ||
325 | out: | |
326 | read_unlock(&xp->lock); | |
327 | xfrm_pol_put(xp); | |
328 | return; | |
329 | ||
330 | expired: | |
331 | read_unlock(&xp->lock); | |
4666faab | 332 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 333 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
334 | xfrm_pol_put(xp); |
335 | } | |
336 | ||
337 | ||
338 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
339 | * SPD calls. | |
340 | */ | |
341 | ||
dd0fc66f | 342 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
1da177e4 LT |
343 | { |
344 | struct xfrm_policy *policy; | |
345 | ||
0da974f4 | 346 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
347 | |
348 | if (policy) { | |
2518c7c2 DM |
349 | INIT_HLIST_NODE(&policy->bydst); |
350 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 351 | rwlock_init(&policy->lock); |
2518c7c2 | 352 | atomic_set(&policy->refcnt, 1); |
1da177e4 LT |
353 | init_timer(&policy->timer); |
354 | policy->timer.data = (unsigned long)policy; | |
355 | policy->timer.function = xfrm_policy_timer; | |
356 | } | |
357 | return policy; | |
358 | } | |
359 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
360 | ||
361 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
362 | ||
363 | void __xfrm_policy_destroy(struct xfrm_policy *policy) | |
364 | { | |
09a62660 | 365 | BUG_ON(!policy->dead); |
1da177e4 | 366 | |
09a62660 | 367 | BUG_ON(policy->bundles); |
1da177e4 LT |
368 | |
369 | if (del_timer(&policy->timer)) | |
370 | BUG(); | |
371 | ||
df71837d | 372 | security_xfrm_policy_free(policy); |
1da177e4 LT |
373 | kfree(policy); |
374 | } | |
375 | EXPORT_SYMBOL(__xfrm_policy_destroy); | |
376 | ||
377 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
378 | { | |
379 | struct dst_entry *dst; | |
380 | ||
381 | while ((dst = policy->bundles) != NULL) { | |
382 | policy->bundles = dst->next; | |
383 | dst_free(dst); | |
384 | } | |
385 | ||
386 | if (del_timer(&policy->timer)) | |
387 | atomic_dec(&policy->refcnt); | |
388 | ||
389 | if (atomic_read(&policy->refcnt) > 1) | |
390 | flow_cache_flush(); | |
391 | ||
392 | xfrm_pol_put(policy); | |
393 | } | |
394 | ||
c4028958 | 395 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
396 | { |
397 | struct xfrm_policy *policy; | |
2518c7c2 DM |
398 | struct hlist_node *entry, *tmp; |
399 | struct hlist_head gc_list; | |
1da177e4 LT |
400 | |
401 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
402 | gc_list.first = xfrm_policy_gc_list.first; |
403 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
404 | spin_unlock_bh(&xfrm_policy_gc_lock); |
405 | ||
2518c7c2 | 406 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 407 | xfrm_policy_gc_kill(policy); |
1da177e4 LT |
408 | } |
409 | ||
410 | /* Rule must be locked. Release descentant resources, announce | |
411 | * entry dead. The rule must be unlinked from lists to the moment. | |
412 | */ | |
413 | ||
414 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
415 | { | |
416 | int dead; | |
417 | ||
418 | write_lock_bh(&policy->lock); | |
419 | dead = policy->dead; | |
420 | policy->dead = 1; | |
421 | write_unlock_bh(&policy->lock); | |
422 | ||
423 | if (unlikely(dead)) { | |
424 | WARN_ON(1); | |
425 | return; | |
426 | } | |
427 | ||
428 | spin_lock(&xfrm_policy_gc_lock); | |
2518c7c2 | 429 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
1da177e4 LT |
430 | spin_unlock(&xfrm_policy_gc_lock); |
431 | ||
432 | schedule_work(&xfrm_policy_gc_work); | |
433 | } | |
434 | ||
2518c7c2 DM |
435 | struct xfrm_policy_hash { |
436 | struct hlist_head *table; | |
437 | unsigned int hmask; | |
438 | }; | |
439 | ||
440 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
441 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
442 | static struct hlist_head *xfrm_policy_byidx __read_mostly; | |
443 | static unsigned int xfrm_idx_hmask __read_mostly; | |
444 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
445 | ||
2518c7c2 DM |
446 | static inline unsigned int idx_hash(u32 index) |
447 | { | |
448 | return __idx_hash(index, xfrm_idx_hmask); | |
449 | } | |
450 | ||
2518c7c2 DM |
451 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
452 | { | |
453 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
454 | unsigned int hash = __sel_hash(sel, family, hmask); | |
455 | ||
456 | return (hash == hmask + 1 ? | |
457 | &xfrm_policy_inexact[dir] : | |
458 | xfrm_policy_bydst[dir].table + hash); | |
459 | } | |
460 | ||
461 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
462 | { | |
463 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
464 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
465 | ||
466 | return xfrm_policy_bydst[dir].table + hash; | |
467 | } | |
468 | ||
2518c7c2 DM |
469 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
470 | struct hlist_head *ndsttable, | |
471 | unsigned int nhashmask) | |
472 | { | |
473 | struct hlist_node *entry, *tmp; | |
474 | struct xfrm_policy *pol; | |
475 | ||
476 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { | |
477 | unsigned int h; | |
478 | ||
479 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
480 | pol->family, nhashmask); | |
481 | hlist_add_head(&pol->bydst, ndsttable+h); | |
482 | } | |
483 | } | |
484 | ||
485 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
486 | struct hlist_head *nidxtable, | |
487 | unsigned int nhashmask) | |
488 | { | |
489 | struct hlist_node *entry, *tmp; | |
490 | struct xfrm_policy *pol; | |
491 | ||
492 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
493 | unsigned int h; | |
494 | ||
495 | h = __idx_hash(pol->index, nhashmask); | |
496 | hlist_add_head(&pol->byidx, nidxtable+h); | |
497 | } | |
498 | } | |
499 | ||
500 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
501 | { | |
502 | return ((old_hmask + 1) << 1) - 1; | |
503 | } | |
504 | ||
505 | static void xfrm_bydst_resize(int dir) | |
506 | { | |
507 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
508 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
509 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
510 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 511 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
512 | int i; |
513 | ||
514 | if (!ndst) | |
515 | return; | |
516 | ||
517 | write_lock_bh(&xfrm_policy_lock); | |
518 | ||
519 | for (i = hmask; i >= 0; i--) | |
520 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
521 | ||
522 | xfrm_policy_bydst[dir].table = ndst; | |
523 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
524 | ||
525 | write_unlock_bh(&xfrm_policy_lock); | |
526 | ||
44e36b42 | 527 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
528 | } |
529 | ||
530 | static void xfrm_byidx_resize(int total) | |
531 | { | |
532 | unsigned int hmask = xfrm_idx_hmask; | |
533 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
534 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
535 | struct hlist_head *oidx = xfrm_policy_byidx; | |
44e36b42 | 536 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
537 | int i; |
538 | ||
539 | if (!nidx) | |
540 | return; | |
541 | ||
542 | write_lock_bh(&xfrm_policy_lock); | |
543 | ||
544 | for (i = hmask; i >= 0; i--) | |
545 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
546 | ||
547 | xfrm_policy_byidx = nidx; | |
548 | xfrm_idx_hmask = nhashmask; | |
549 | ||
550 | write_unlock_bh(&xfrm_policy_lock); | |
551 | ||
44e36b42 | 552 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
553 | } |
554 | ||
555 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
556 | { | |
557 | unsigned int cnt = xfrm_policy_count[dir]; | |
558 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
559 | ||
560 | if (total) | |
561 | *total += cnt; | |
562 | ||
563 | if ((hmask + 1) < xfrm_policy_hashmax && | |
564 | cnt > hmask) | |
565 | return 1; | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
570 | static inline int xfrm_byidx_should_resize(int total) | |
571 | { | |
572 | unsigned int hmask = xfrm_idx_hmask; | |
573 | ||
574 | if ((hmask + 1) < xfrm_policy_hashmax && | |
575 | total > hmask) | |
576 | return 1; | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
581 | static DEFINE_MUTEX(hash_resize_mutex); | |
582 | ||
c4028958 | 583 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
584 | { |
585 | int dir, total; | |
586 | ||
587 | mutex_lock(&hash_resize_mutex); | |
588 | ||
589 | total = 0; | |
590 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
591 | if (xfrm_bydst_should_resize(dir, &total)) | |
592 | xfrm_bydst_resize(dir); | |
593 | } | |
594 | if (xfrm_byidx_should_resize(total)) | |
595 | xfrm_byidx_resize(total); | |
596 | ||
597 | mutex_unlock(&hash_resize_mutex); | |
598 | } | |
599 | ||
c4028958 | 600 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 601 | |
1da177e4 LT |
602 | /* Generate new index... KAME seems to generate them ordered by cost |
603 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
4e81bb83 | 604 | static u32 xfrm_gen_index(u8 type, int dir) |
1da177e4 | 605 | { |
1da177e4 LT |
606 | static u32 idx_generator; |
607 | ||
608 | for (;;) { | |
2518c7c2 DM |
609 | struct hlist_node *entry; |
610 | struct hlist_head *list; | |
611 | struct xfrm_policy *p; | |
612 | u32 idx; | |
613 | int found; | |
614 | ||
1da177e4 LT |
615 | idx = (idx_generator | dir); |
616 | idx_generator += 8; | |
617 | if (idx == 0) | |
618 | idx = 8; | |
2518c7c2 DM |
619 | list = xfrm_policy_byidx + idx_hash(idx); |
620 | found = 0; | |
621 | hlist_for_each_entry(p, entry, list, byidx) { | |
622 | if (p->index == idx) { | |
623 | found = 1; | |
1da177e4 | 624 | break; |
2518c7c2 | 625 | } |
1da177e4 | 626 | } |
2518c7c2 | 627 | if (!found) |
1da177e4 LT |
628 | return idx; |
629 | } | |
630 | } | |
631 | ||
2518c7c2 DM |
632 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
633 | { | |
634 | u32 *p1 = (u32 *) s1; | |
635 | u32 *p2 = (u32 *) s2; | |
636 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
637 | int i; | |
638 | ||
639 | for (i = 0; i < len; i++) { | |
640 | if (p1[i] != p2[i]) | |
641 | return 1; | |
642 | } | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
1da177e4 LT |
647 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
648 | { | |
2518c7c2 DM |
649 | struct xfrm_policy *pol; |
650 | struct xfrm_policy *delpol; | |
651 | struct hlist_head *chain; | |
652 | struct hlist_node *entry, *newpos, *last; | |
9b78a82c | 653 | struct dst_entry *gc_list; |
1da177e4 LT |
654 | |
655 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
656 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
657 | delpol = NULL; | |
658 | newpos = NULL; | |
659 | last = NULL; | |
660 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
661 | if (!delpol && | |
662 | pol->type == policy->type && | |
663 | !selector_cmp(&pol->selector, &policy->selector) && | |
df71837d | 664 | xfrm_sec_ctx_match(pol->security, policy->security)) { |
1da177e4 LT |
665 | if (excl) { |
666 | write_unlock_bh(&xfrm_policy_lock); | |
667 | return -EEXIST; | |
668 | } | |
1da177e4 LT |
669 | delpol = pol; |
670 | if (policy->priority > pol->priority) | |
671 | continue; | |
672 | } else if (policy->priority >= pol->priority) { | |
2518c7c2 | 673 | last = &pol->bydst; |
1da177e4 LT |
674 | continue; |
675 | } | |
676 | if (!newpos) | |
2518c7c2 | 677 | newpos = &pol->bydst; |
1da177e4 LT |
678 | if (delpol) |
679 | break; | |
2518c7c2 | 680 | last = &pol->bydst; |
1da177e4 | 681 | } |
2518c7c2 DM |
682 | if (!newpos) |
683 | newpos = last; | |
1da177e4 | 684 | if (newpos) |
2518c7c2 DM |
685 | hlist_add_after(newpos, &policy->bydst); |
686 | else | |
687 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 688 | xfrm_pol_hold(policy); |
2518c7c2 | 689 | xfrm_policy_count[dir]++; |
1da177e4 | 690 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
691 | if (delpol) { |
692 | hlist_del(&delpol->bydst); | |
693 | hlist_del(&delpol->byidx); | |
694 | xfrm_policy_count[dir]--; | |
695 | } | |
4e81bb83 | 696 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 697 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
1da177e4 LT |
698 | policy->curlft.add_time = (unsigned long)xtime.tv_sec; |
699 | policy->curlft.use_time = 0; | |
700 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
701 | xfrm_pol_hold(policy); | |
702 | write_unlock_bh(&xfrm_policy_lock); | |
703 | ||
9b78a82c | 704 | if (delpol) |
1da177e4 | 705 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
706 | else if (xfrm_bydst_should_resize(dir, NULL)) |
707 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
708 | |
709 | read_lock_bh(&xfrm_policy_lock); | |
710 | gc_list = NULL; | |
2518c7c2 DM |
711 | entry = &policy->bydst; |
712 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
713 | struct dst_entry *dst; |
714 | ||
715 | write_lock(&policy->lock); | |
716 | dst = policy->bundles; | |
717 | if (dst) { | |
718 | struct dst_entry *tail = dst; | |
719 | while (tail->next) | |
720 | tail = tail->next; | |
721 | tail->next = gc_list; | |
722 | gc_list = dst; | |
723 | ||
724 | policy->bundles = NULL; | |
725 | } | |
726 | write_unlock(&policy->lock); | |
1da177e4 | 727 | } |
9b78a82c DM |
728 | read_unlock_bh(&xfrm_policy_lock); |
729 | ||
730 | while (gc_list) { | |
731 | struct dst_entry *dst = gc_list; | |
732 | ||
733 | gc_list = dst->next; | |
734 | dst_free(dst); | |
735 | } | |
736 | ||
1da177e4 LT |
737 | return 0; |
738 | } | |
739 | EXPORT_SYMBOL(xfrm_policy_insert); | |
740 | ||
4e81bb83 MN |
741 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
742 | struct xfrm_selector *sel, | |
df71837d | 743 | struct xfrm_sec_ctx *ctx, int delete) |
1da177e4 | 744 | { |
2518c7c2 DM |
745 | struct xfrm_policy *pol, *ret; |
746 | struct hlist_head *chain; | |
747 | struct hlist_node *entry; | |
1da177e4 LT |
748 | |
749 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
750 | chain = policy_hash_bysel(sel, sel->family, dir); |
751 | ret = NULL; | |
752 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
753 | if (pol->type == type && | |
754 | !selector_cmp(sel, &pol->selector) && | |
755 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 756 | xfrm_pol_hold(pol); |
2518c7c2 DM |
757 | if (delete) { |
758 | hlist_del(&pol->bydst); | |
759 | hlist_del(&pol->byidx); | |
760 | xfrm_policy_count[dir]--; | |
761 | } | |
762 | ret = pol; | |
1da177e4 LT |
763 | break; |
764 | } | |
765 | } | |
766 | write_unlock_bh(&xfrm_policy_lock); | |
767 | ||
2518c7c2 | 768 | if (ret && delete) { |
1da177e4 | 769 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 770 | xfrm_policy_kill(ret); |
1da177e4 | 771 | } |
2518c7c2 | 772 | return ret; |
1da177e4 | 773 | } |
df71837d | 774 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 775 | |
4e81bb83 | 776 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete) |
1da177e4 | 777 | { |
2518c7c2 DM |
778 | struct xfrm_policy *pol, *ret; |
779 | struct hlist_head *chain; | |
780 | struct hlist_node *entry; | |
1da177e4 LT |
781 | |
782 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
783 | chain = xfrm_policy_byidx + idx_hash(id); |
784 | ret = NULL; | |
785 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
786 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 787 | xfrm_pol_hold(pol); |
2518c7c2 DM |
788 | if (delete) { |
789 | hlist_del(&pol->bydst); | |
790 | hlist_del(&pol->byidx); | |
791 | xfrm_policy_count[dir]--; | |
792 | } | |
793 | ret = pol; | |
1da177e4 LT |
794 | break; |
795 | } | |
796 | } | |
797 | write_unlock_bh(&xfrm_policy_lock); | |
798 | ||
2518c7c2 | 799 | if (ret && delete) { |
1da177e4 | 800 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 801 | xfrm_policy_kill(ret); |
1da177e4 | 802 | } |
2518c7c2 | 803 | return ret; |
1da177e4 LT |
804 | } |
805 | EXPORT_SYMBOL(xfrm_policy_byid); | |
806 | ||
4e81bb83 | 807 | void xfrm_policy_flush(u8 type) |
1da177e4 | 808 | { |
1da177e4 LT |
809 | int dir; |
810 | ||
811 | write_lock_bh(&xfrm_policy_lock); | |
812 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
813 | struct xfrm_policy *pol; |
814 | struct hlist_node *entry; | |
ae8c0577 | 815 | int i, killed; |
2518c7c2 | 816 | |
ae8c0577 | 817 | killed = 0; |
2518c7c2 DM |
818 | again1: |
819 | hlist_for_each_entry(pol, entry, | |
820 | &xfrm_policy_inexact[dir], bydst) { | |
821 | if (pol->type != type) | |
822 | continue; | |
823 | hlist_del(&pol->bydst); | |
824 | hlist_del(&pol->byidx); | |
1da177e4 LT |
825 | write_unlock_bh(&xfrm_policy_lock); |
826 | ||
2518c7c2 | 827 | xfrm_policy_kill(pol); |
ae8c0577 | 828 | killed++; |
1da177e4 LT |
829 | |
830 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
831 | goto again1; |
832 | } | |
833 | ||
834 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
835 | again2: | |
836 | hlist_for_each_entry(pol, entry, | |
837 | xfrm_policy_bydst[dir].table + i, | |
838 | bydst) { | |
839 | if (pol->type != type) | |
840 | continue; | |
841 | hlist_del(&pol->bydst); | |
842 | hlist_del(&pol->byidx); | |
843 | write_unlock_bh(&xfrm_policy_lock); | |
844 | ||
845 | xfrm_policy_kill(pol); | |
ae8c0577 | 846 | killed++; |
2518c7c2 DM |
847 | |
848 | write_lock_bh(&xfrm_policy_lock); | |
849 | goto again2; | |
850 | } | |
1da177e4 | 851 | } |
2518c7c2 | 852 | |
ae8c0577 | 853 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
854 | } |
855 | atomic_inc(&flow_cache_genid); | |
856 | write_unlock_bh(&xfrm_policy_lock); | |
857 | } | |
858 | EXPORT_SYMBOL(xfrm_policy_flush); | |
859 | ||
4e81bb83 | 860 | int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
861 | void *data) |
862 | { | |
2518c7c2 DM |
863 | struct xfrm_policy *pol; |
864 | struct hlist_node *entry; | |
865 | int dir, count, error; | |
1da177e4 LT |
866 | |
867 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 | 868 | count = 0; |
1da177e4 | 869 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
870 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
871 | int i; | |
872 | ||
873 | hlist_for_each_entry(pol, entry, | |
874 | &xfrm_policy_inexact[dir], bydst) { | |
875 | if (pol->type == type) | |
876 | count++; | |
877 | } | |
878 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
879 | hlist_for_each_entry(pol, entry, table + i, bydst) { | |
880 | if (pol->type == type) | |
881 | count++; | |
882 | } | |
883 | } | |
1da177e4 LT |
884 | } |
885 | ||
886 | if (count == 0) { | |
887 | error = -ENOENT; | |
888 | goto out; | |
889 | } | |
890 | ||
891 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
892 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
893 | int i; | |
894 | ||
895 | hlist_for_each_entry(pol, entry, | |
896 | &xfrm_policy_inexact[dir], bydst) { | |
897 | if (pol->type != type) | |
898 | continue; | |
899 | error = func(pol, dir % XFRM_POLICY_MAX, --count, data); | |
1da177e4 LT |
900 | if (error) |
901 | goto out; | |
902 | } | |
2518c7c2 DM |
903 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
904 | hlist_for_each_entry(pol, entry, table + i, bydst) { | |
905 | if (pol->type != type) | |
906 | continue; | |
907 | error = func(pol, dir % XFRM_POLICY_MAX, --count, data); | |
908 | if (error) | |
909 | goto out; | |
910 | } | |
911 | } | |
1da177e4 | 912 | } |
2518c7c2 | 913 | error = 0; |
1da177e4 LT |
914 | out: |
915 | read_unlock_bh(&xfrm_policy_lock); | |
916 | return error; | |
917 | } | |
918 | EXPORT_SYMBOL(xfrm_policy_walk); | |
919 | ||
134b0fc5 JM |
920 | /* |
921 | * Find policy to apply to this flow. | |
922 | * | |
923 | * Returns 0 if policy found, else an -errno. | |
924 | */ | |
2518c7c2 DM |
925 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
926 | u8 type, u16 family, int dir) | |
1da177e4 | 927 | { |
2518c7c2 | 928 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 929 | int match, ret = -ESRCH; |
1da177e4 | 930 | |
2518c7c2 DM |
931 | if (pol->family != family || |
932 | pol->type != type) | |
134b0fc5 | 933 | return ret; |
1da177e4 | 934 | |
2518c7c2 | 935 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 JM |
936 | if (match) |
937 | ret = security_xfrm_policy_lookup(pol, fl->secid, dir); | |
2518c7c2 | 938 | |
134b0fc5 | 939 | return ret; |
2518c7c2 | 940 | } |
1da177e4 | 941 | |
2518c7c2 DM |
942 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
943 | u16 family, u8 dir) | |
944 | { | |
134b0fc5 | 945 | int err; |
2518c7c2 DM |
946 | struct xfrm_policy *pol, *ret; |
947 | xfrm_address_t *daddr, *saddr; | |
948 | struct hlist_node *entry; | |
949 | struct hlist_head *chain; | |
acba48e1 | 950 | u32 priority = ~0U; |
df71837d | 951 | |
2518c7c2 DM |
952 | daddr = xfrm_flowi_daddr(fl, family); |
953 | saddr = xfrm_flowi_saddr(fl, family); | |
954 | if (unlikely(!daddr || !saddr)) | |
955 | return NULL; | |
956 | ||
957 | read_lock_bh(&xfrm_policy_lock); | |
958 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
959 | ret = NULL; | |
960 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
961 | err = xfrm_policy_match(pol, fl, type, family, dir); |
962 | if (err) { | |
963 | if (err == -ESRCH) | |
964 | continue; | |
965 | else { | |
966 | ret = ERR_PTR(err); | |
967 | goto fail; | |
968 | } | |
969 | } else { | |
2518c7c2 | 970 | ret = pol; |
acba48e1 | 971 | priority = ret->priority; |
2518c7c2 DM |
972 | break; |
973 | } | |
974 | } | |
acba48e1 DM |
975 | chain = &xfrm_policy_inexact[dir]; |
976 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
977 | err = xfrm_policy_match(pol, fl, type, family, dir); |
978 | if (err) { | |
979 | if (err == -ESRCH) | |
980 | continue; | |
981 | else { | |
982 | ret = ERR_PTR(err); | |
983 | goto fail; | |
984 | } | |
985 | } else if (pol->priority < priority) { | |
acba48e1 DM |
986 | ret = pol; |
987 | break; | |
1da177e4 LT |
988 | } |
989 | } | |
acba48e1 DM |
990 | if (ret) |
991 | xfrm_pol_hold(ret); | |
134b0fc5 | 992 | fail: |
1da177e4 | 993 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 994 | |
2518c7c2 | 995 | return ret; |
4e81bb83 MN |
996 | } |
997 | ||
134b0fc5 | 998 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
999 | void **objp, atomic_t **obj_refp) |
1000 | { | |
1001 | struct xfrm_policy *pol; | |
134b0fc5 | 1002 | int err = 0; |
4e81bb83 MN |
1003 | |
1004 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1005 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
1006 | if (IS_ERR(pol)) { |
1007 | err = PTR_ERR(pol); | |
1008 | pol = NULL; | |
1009 | } | |
1010 | if (pol || err) | |
4e81bb83 MN |
1011 | goto end; |
1012 | #endif | |
1013 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
1014 | if (IS_ERR(pol)) { |
1015 | err = PTR_ERR(pol); | |
1016 | pol = NULL; | |
1017 | } | |
4e81bb83 | 1018 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1019 | end: |
4e81bb83 | 1020 | #endif |
1da177e4 LT |
1021 | if ((*objp = (void *) pol) != NULL) |
1022 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1023 | return err; |
1da177e4 LT |
1024 | } |
1025 | ||
df71837d TJ |
1026 | static inline int policy_to_flow_dir(int dir) |
1027 | { | |
1028 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
1029 | XFRM_POLICY_OUT == FLOW_DIR_OUT && | |
1030 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1031 | return dir; | |
1032 | switch (dir) { | |
1033 | default: | |
1034 | case XFRM_POLICY_IN: | |
1035 | return FLOW_DIR_IN; | |
1036 | case XFRM_POLICY_OUT: | |
1037 | return FLOW_DIR_OUT; | |
1038 | case XFRM_POLICY_FWD: | |
1039 | return FLOW_DIR_FWD; | |
1040 | }; | |
1041 | } | |
1042 | ||
e0d1caa7 | 1043 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1044 | { |
1045 | struct xfrm_policy *pol; | |
1046 | ||
1047 | read_lock_bh(&xfrm_policy_lock); | |
1048 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
df71837d | 1049 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1050 | sk->sk_family); |
df71837d TJ |
1051 | int err = 0; |
1052 | ||
3bccfbc7 VY |
1053 | if (match) { |
1054 | err = security_xfrm_policy_lookup(pol, fl->secid, | |
1055 | policy_to_flow_dir(dir)); | |
1056 | if (!err) | |
1057 | xfrm_pol_hold(pol); | |
1058 | else if (err == -ESRCH) | |
1059 | pol = NULL; | |
1060 | else | |
1061 | pol = ERR_PTR(err); | |
1062 | } else | |
1da177e4 LT |
1063 | pol = NULL; |
1064 | } | |
1065 | read_unlock_bh(&xfrm_policy_lock); | |
1066 | return pol; | |
1067 | } | |
1068 | ||
1069 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1070 | { | |
2518c7c2 DM |
1071 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1072 | pol->family, dir); | |
4e81bb83 | 1073 | |
2518c7c2 DM |
1074 | hlist_add_head(&pol->bydst, chain); |
1075 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1076 | xfrm_policy_count[dir]++; | |
1da177e4 | 1077 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1078 | |
1079 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1080 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1081 | } |
1082 | ||
1083 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1084 | int dir) | |
1085 | { | |
2518c7c2 DM |
1086 | if (hlist_unhashed(&pol->bydst)) |
1087 | return NULL; | |
1da177e4 | 1088 | |
2518c7c2 DM |
1089 | hlist_del(&pol->bydst); |
1090 | hlist_del(&pol->byidx); | |
1091 | xfrm_policy_count[dir]--; | |
1092 | ||
1093 | return pol; | |
1da177e4 LT |
1094 | } |
1095 | ||
4666faab | 1096 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1097 | { |
1098 | write_lock_bh(&xfrm_policy_lock); | |
1099 | pol = __xfrm_policy_unlink(pol, dir); | |
1100 | write_unlock_bh(&xfrm_policy_lock); | |
1101 | if (pol) { | |
1102 | if (dir < XFRM_POLICY_MAX) | |
1103 | atomic_inc(&flow_cache_genid); | |
1104 | xfrm_policy_kill(pol); | |
4666faab | 1105 | return 0; |
1da177e4 | 1106 | } |
4666faab | 1107 | return -ENOENT; |
1da177e4 | 1108 | } |
a70fcb0b | 1109 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1110 | |
1111 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1112 | { | |
1113 | struct xfrm_policy *old_pol; | |
1114 | ||
4e81bb83 MN |
1115 | #ifdef CONFIG_XFRM_SUB_POLICY |
1116 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1117 | return -EINVAL; | |
1118 | #endif | |
1119 | ||
1da177e4 LT |
1120 | write_lock_bh(&xfrm_policy_lock); |
1121 | old_pol = sk->sk_policy[dir]; | |
1122 | sk->sk_policy[dir] = pol; | |
1123 | if (pol) { | |
1124 | pol->curlft.add_time = (unsigned long)xtime.tv_sec; | |
4e81bb83 | 1125 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1126 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1127 | } | |
1128 | if (old_pol) | |
1129 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1130 | write_unlock_bh(&xfrm_policy_lock); | |
1131 | ||
1132 | if (old_pol) { | |
1133 | xfrm_policy_kill(old_pol); | |
1134 | } | |
1135 | return 0; | |
1136 | } | |
1137 | ||
1138 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1139 | { | |
1140 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1141 | ||
1142 | if (newp) { | |
1143 | newp->selector = old->selector; | |
df71837d TJ |
1144 | if (security_xfrm_policy_clone(old, newp)) { |
1145 | kfree(newp); | |
1146 | return NULL; /* ENOMEM */ | |
1147 | } | |
1da177e4 LT |
1148 | newp->lft = old->lft; |
1149 | newp->curlft = old->curlft; | |
1150 | newp->action = old->action; | |
1151 | newp->flags = old->flags; | |
1152 | newp->xfrm_nr = old->xfrm_nr; | |
1153 | newp->index = old->index; | |
4e81bb83 | 1154 | newp->type = old->type; |
1da177e4 LT |
1155 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1156 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1157 | write_lock_bh(&xfrm_policy_lock); | |
1158 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1159 | write_unlock_bh(&xfrm_policy_lock); | |
1160 | xfrm_pol_put(newp); | |
1161 | } | |
1162 | return newp; | |
1163 | } | |
1164 | ||
1165 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1166 | { | |
1167 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1168 | *p1 = sk->sk_policy[1]; | |
1169 | ||
1170 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1171 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1172 | return -ENOMEM; | |
1173 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1174 | return -ENOMEM; | |
1175 | return 0; | |
1176 | } | |
1177 | ||
a1e59abf PM |
1178 | static int |
1179 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1180 | unsigned short family) | |
1181 | { | |
1182 | int err; | |
1183 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1184 | ||
1185 | if (unlikely(afinfo == NULL)) | |
1186 | return -EINVAL; | |
1187 | err = afinfo->get_saddr(local, remote); | |
1188 | xfrm_policy_put_afinfo(afinfo); | |
1189 | return err; | |
1190 | } | |
1191 | ||
1da177e4 LT |
1192 | /* Resolve list of templates for the flow, given policy. */ |
1193 | ||
1194 | static int | |
4e81bb83 MN |
1195 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1196 | struct xfrm_state **xfrm, | |
1197 | unsigned short family) | |
1da177e4 LT |
1198 | { |
1199 | int nx; | |
1200 | int i, error; | |
1201 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1202 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1203 | xfrm_address_t tmp; |
1da177e4 LT |
1204 | |
1205 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1206 | struct xfrm_state *x; | |
1207 | xfrm_address_t *remote = daddr; | |
1208 | xfrm_address_t *local = saddr; | |
1209 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1210 | ||
7e49e6de | 1211 | if (tmpl->mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
1212 | remote = &tmpl->id.daddr; |
1213 | local = &tmpl->saddr; | |
76b3f055 | 1214 | family = tmpl->encap_family; |
a1e59abf PM |
1215 | if (xfrm_addr_any(local, family)) { |
1216 | error = xfrm_get_saddr(&tmp, remote, family); | |
1217 | if (error) | |
1218 | goto fail; | |
1219 | local = &tmp; | |
1220 | } | |
1da177e4 LT |
1221 | } |
1222 | ||
1223 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1224 | ||
1225 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1226 | xfrm[nx++] = x; | |
1227 | daddr = remote; | |
1228 | saddr = local; | |
1229 | continue; | |
1230 | } | |
1231 | if (x) { | |
1232 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1233 | -EINVAL : -EAGAIN); | |
1234 | xfrm_state_put(x); | |
1235 | } | |
1236 | ||
1237 | if (!tmpl->optional) | |
1238 | goto fail; | |
1239 | } | |
1240 | return nx; | |
1241 | ||
1242 | fail: | |
1243 | for (nx--; nx>=0; nx--) | |
1244 | xfrm_state_put(xfrm[nx]); | |
1245 | return error; | |
1246 | } | |
1247 | ||
4e81bb83 MN |
1248 | static int |
1249 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1250 | struct xfrm_state **xfrm, | |
1251 | unsigned short family) | |
1252 | { | |
41a49cc3 MN |
1253 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1254 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1255 | int cnx = 0; |
1256 | int error; | |
1257 | int ret; | |
1258 | int i; | |
1259 | ||
1260 | for (i = 0; i < npols; i++) { | |
1261 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1262 | error = -ENOBUFS; | |
1263 | goto fail; | |
1264 | } | |
41a49cc3 MN |
1265 | |
1266 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1267 | if (ret < 0) { |
1268 | error = ret; | |
1269 | goto fail; | |
1270 | } else | |
1271 | cnx += ret; | |
1272 | } | |
1273 | ||
41a49cc3 MN |
1274 | /* found states are sorted for outbound processing */ |
1275 | if (npols > 1) | |
1276 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1277 | ||
4e81bb83 MN |
1278 | return cnx; |
1279 | ||
1280 | fail: | |
1281 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1282 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1283 | return error; |
1284 | ||
1285 | } | |
1286 | ||
1da177e4 LT |
1287 | /* Check that the bundle accepts the flow and its components are |
1288 | * still valid. | |
1289 | */ | |
1290 | ||
1291 | static struct dst_entry * | |
1292 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1293 | { | |
1294 | struct dst_entry *x; | |
1295 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1296 | if (unlikely(afinfo == NULL)) | |
1297 | return ERR_PTR(-EINVAL); | |
1298 | x = afinfo->find_bundle(fl, policy); | |
1299 | xfrm_policy_put_afinfo(afinfo); | |
1300 | return x; | |
1301 | } | |
1302 | ||
1303 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate | |
1304 | * all the metrics... Shortly, bundle a bundle. | |
1305 | */ | |
1306 | ||
1307 | static int | |
1308 | xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, | |
1309 | struct flowi *fl, struct dst_entry **dst_p, | |
1310 | unsigned short family) | |
1311 | { | |
1312 | int err; | |
1313 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1314 | if (unlikely(afinfo == NULL)) | |
1315 | return -EINVAL; | |
1316 | err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p); | |
1317 | xfrm_policy_put_afinfo(afinfo); | |
1318 | return err; | |
1319 | } | |
1320 | ||
1da177e4 LT |
1321 | |
1322 | static int stale_bundle(struct dst_entry *dst); | |
1323 | ||
1324 | /* Main function: finds/creates a bundle for given flow. | |
1325 | * | |
1326 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1327 | * on interfaces with disabled IPsec. | |
1328 | */ | |
1329 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1330 | struct sock *sk, int flags) | |
1331 | { | |
1332 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1333 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1334 | int npols; | |
1335 | int pol_dead; | |
1336 | int xfrm_nr; | |
1337 | int pi; | |
1da177e4 LT |
1338 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1339 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1340 | int nx = 0; | |
1341 | int err; | |
1342 | u32 genid; | |
42cf93cd | 1343 | u16 family; |
df71837d | 1344 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1345 | |
1da177e4 LT |
1346 | restart: |
1347 | genid = atomic_read(&flow_cache_genid); | |
1348 | policy = NULL; | |
4e81bb83 MN |
1349 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1350 | pols[pi] = NULL; | |
1351 | npols = 0; | |
1352 | pol_dead = 0; | |
1353 | xfrm_nr = 0; | |
1354 | ||
3bccfbc7 | 1355 | if (sk && sk->sk_policy[1]) { |
e0d1caa7 | 1356 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
3bccfbc7 VY |
1357 | if (IS_ERR(policy)) |
1358 | return PTR_ERR(policy); | |
1359 | } | |
1da177e4 LT |
1360 | |
1361 | if (!policy) { | |
1362 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1363 | if ((dst_orig->flags & DST_NOXFRM) || |
1364 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
1da177e4 LT |
1365 | return 0; |
1366 | ||
e0d1caa7 | 1367 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1368 | dir, xfrm_policy_lookup); |
134b0fc5 JM |
1369 | if (IS_ERR(policy)) |
1370 | return PTR_ERR(policy); | |
1da177e4 LT |
1371 | } |
1372 | ||
1373 | if (!policy) | |
1374 | return 0; | |
1375 | ||
42cf93cd | 1376 | family = dst_orig->ops->family; |
1da177e4 | 1377 | policy->curlft.use_time = (unsigned long)xtime.tv_sec; |
4e81bb83 MN |
1378 | pols[0] = policy; |
1379 | npols ++; | |
1380 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 LT |
1381 | |
1382 | switch (policy->action) { | |
1383 | case XFRM_POLICY_BLOCK: | |
1384 | /* Prohibit the flow */ | |
e104411b PM |
1385 | err = -EPERM; |
1386 | goto error; | |
1da177e4 LT |
1387 | |
1388 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1389 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1390 | if (policy->xfrm_nr == 0) { |
1391 | /* Flow passes not transformed. */ | |
1392 | xfrm_pol_put(policy); | |
1393 | return 0; | |
1394 | } | |
4e81bb83 | 1395 | #endif |
1da177e4 LT |
1396 | |
1397 | /* Try to find matching bundle. | |
1398 | * | |
1399 | * LATER: help from flow cache. It is optional, this | |
1400 | * is required only for output policy. | |
1401 | */ | |
1402 | dst = xfrm_find_bundle(fl, policy, family); | |
1403 | if (IS_ERR(dst)) { | |
e104411b PM |
1404 | err = PTR_ERR(dst); |
1405 | goto error; | |
1da177e4 LT |
1406 | } |
1407 | ||
1408 | if (dst) | |
1409 | break; | |
1410 | ||
4e81bb83 MN |
1411 | #ifdef CONFIG_XFRM_SUB_POLICY |
1412 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1413 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1414 | fl, family, | |
1415 | XFRM_POLICY_OUT); | |
1416 | if (pols[1]) { | |
134b0fc5 JM |
1417 | if (IS_ERR(pols[1])) { |
1418 | err = PTR_ERR(pols[1]); | |
1419 | goto error; | |
1420 | } | |
4e81bb83 MN |
1421 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
1422 | err = -EPERM; | |
1423 | goto error; | |
1424 | } | |
1425 | npols ++; | |
1426 | xfrm_nr += pols[1]->xfrm_nr; | |
1427 | } | |
1428 | } | |
1429 | ||
1430 | /* | |
1431 | * Because neither flowi nor bundle information knows about | |
1432 | * transformation template size. On more than one policy usage | |
1433 | * we can realize whether all of them is bypass or not after | |
1434 | * they are searched. See above not-transformed bypass | |
1435 | * is surrounded by non-sub policy configuration, too. | |
1436 | */ | |
1437 | if (xfrm_nr == 0) { | |
1438 | /* Flow passes not transformed. */ | |
1439 | xfrm_pols_put(pols, npols); | |
1440 | return 0; | |
1441 | } | |
1442 | ||
1443 | #endif | |
1444 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1445 | |
1446 | if (unlikely(nx<0)) { | |
1447 | err = nx; | |
1448 | if (err == -EAGAIN && flags) { | |
1449 | DECLARE_WAITQUEUE(wait, current); | |
1450 | ||
1451 | add_wait_queue(&km_waitq, &wait); | |
1452 | set_current_state(TASK_INTERRUPTIBLE); | |
1453 | schedule(); | |
1454 | set_current_state(TASK_RUNNING); | |
1455 | remove_wait_queue(&km_waitq, &wait); | |
1456 | ||
4e81bb83 | 1457 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1458 | |
1459 | if (nx == -EAGAIN && signal_pending(current)) { | |
1460 | err = -ERESTART; | |
1461 | goto error; | |
1462 | } | |
1463 | if (nx == -EAGAIN || | |
1464 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1465 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1466 | goto restart; |
1467 | } | |
1468 | err = nx; | |
1469 | } | |
1470 | if (err < 0) | |
1471 | goto error; | |
1472 | } | |
1473 | if (nx == 0) { | |
1474 | /* Flow passes not transformed. */ | |
4e81bb83 | 1475 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1476 | return 0; |
1477 | } | |
1478 | ||
1479 | dst = dst_orig; | |
1480 | err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family); | |
1481 | ||
1482 | if (unlikely(err)) { | |
1483 | int i; | |
1484 | for (i=0; i<nx; i++) | |
1485 | xfrm_state_put(xfrm[i]); | |
1486 | goto error; | |
1487 | } | |
1488 | ||
4e81bb83 MN |
1489 | for (pi = 0; pi < npols; pi++) { |
1490 | read_lock_bh(&pols[pi]->lock); | |
1491 | pol_dead |= pols[pi]->dead; | |
1492 | read_unlock_bh(&pols[pi]->lock); | |
1493 | } | |
1494 | ||
1da177e4 | 1495 | write_lock_bh(&policy->lock); |
4e81bb83 | 1496 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1497 | /* Wow! While we worked on resolving, this |
1498 | * policy has gone. Retry. It is not paranoia, | |
1499 | * we just cannot enlist new bundle to dead object. | |
1500 | * We can't enlist stable bundles either. | |
1501 | */ | |
1502 | write_unlock_bh(&policy->lock); | |
1da177e4 LT |
1503 | if (dst) |
1504 | dst_free(dst); | |
00de651d HX |
1505 | |
1506 | err = -EHOSTUNREACH; | |
1507 | goto error; | |
1da177e4 LT |
1508 | } |
1509 | dst->next = policy->bundles; | |
1510 | policy->bundles = dst; | |
1511 | dst_hold(dst); | |
1512 | write_unlock_bh(&policy->lock); | |
1513 | } | |
1514 | *dst_p = dst; | |
1515 | dst_release(dst_orig); | |
4e81bb83 | 1516 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1517 | return 0; |
1518 | ||
1519 | error: | |
1520 | dst_release(dst_orig); | |
4e81bb83 | 1521 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1522 | *dst_p = NULL; |
1523 | return err; | |
1524 | } | |
1525 | EXPORT_SYMBOL(xfrm_lookup); | |
1526 | ||
df0ba92a MN |
1527 | static inline int |
1528 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1529 | { | |
1530 | struct xfrm_state *x; | |
1531 | int err; | |
1532 | ||
1533 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1534 | return 0; | |
1535 | x = skb->sp->xvec[idx]; | |
1536 | if (!x->type->reject) | |
1537 | return 0; | |
1538 | xfrm_state_hold(x); | |
1539 | err = x->type->reject(x, skb, fl); | |
1540 | xfrm_state_put(x); | |
1541 | return err; | |
1542 | } | |
1543 | ||
1da177e4 LT |
1544 | /* When skb is transformed back to its "native" form, we have to |
1545 | * check policy restrictions. At the moment we make this in maximally | |
1546 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1547 | * have policy cached at them. | |
1548 | */ | |
1549 | ||
1550 | static inline int | |
1551 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, | |
1552 | unsigned short family) | |
1553 | { | |
1554 | if (xfrm_state_kern(x)) | |
1555 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, family); | |
1556 | return x->id.proto == tmpl->id.proto && | |
1557 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1558 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1559 | x->props.mode == tmpl->mode && | |
f3bd4840 MN |
1560 | ((tmpl->aalgos & (1<<x->props.aalgo)) || |
1561 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && | |
7e49e6de MN |
1562 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1563 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1564 | } |
1565 | ||
df0ba92a MN |
1566 | /* |
1567 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1568 | * because of optional transport mode, or next index of the mathced secpath | |
1569 | * state with the template. | |
1570 | * -1 is returned when no matching template is found. | |
1571 | * Otherwise "-2 - errored_index" is returned. | |
1572 | */ | |
1da177e4 LT |
1573 | static inline int |
1574 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1575 | unsigned short family) | |
1576 | { | |
1577 | int idx = start; | |
1578 | ||
1579 | if (tmpl->optional) { | |
7e49e6de | 1580 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1581 | return start; |
1582 | } else | |
1583 | start = -1; | |
1584 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1585 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1586 | return ++idx; |
df0ba92a MN |
1587 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1588 | if (start == -1) | |
1589 | start = -2-idx; | |
1da177e4 | 1590 | break; |
df0ba92a | 1591 | } |
1da177e4 LT |
1592 | } |
1593 | return start; | |
1594 | } | |
1595 | ||
3e3850e9 PM |
1596 | int |
1597 | xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family) | |
1da177e4 LT |
1598 | { |
1599 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1600 | int err; |
1da177e4 LT |
1601 | |
1602 | if (unlikely(afinfo == NULL)) | |
1603 | return -EAFNOSUPPORT; | |
1604 | ||
1605 | afinfo->decode_session(skb, fl); | |
beb8d13b | 1606 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1607 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1608 | return err; |
1da177e4 | 1609 | } |
3e3850e9 | 1610 | EXPORT_SYMBOL(xfrm_decode_session); |
1da177e4 | 1611 | |
df0ba92a | 1612 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1613 | { |
1614 | for (; k < sp->len; k++) { | |
df0ba92a | 1615 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1616 | *idxp = k; |
1da177e4 | 1617 | return 1; |
df0ba92a | 1618 | } |
1da177e4 LT |
1619 | } |
1620 | ||
1621 | return 0; | |
1622 | } | |
1623 | ||
1624 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, | |
1625 | unsigned short family) | |
1626 | { | |
1627 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1628 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1629 | int npols = 0; | |
1630 | int xfrm_nr; | |
1631 | int pi; | |
1da177e4 | 1632 | struct flowi fl; |
df71837d | 1633 | u8 fl_dir = policy_to_flow_dir(dir); |
df0ba92a | 1634 | int xerr_idx = -1; |
1da177e4 | 1635 | |
3e3850e9 | 1636 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 | 1637 | return 0; |
eb9c7ebe | 1638 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1639 | |
1640 | /* First, check used SA against their selectors. */ | |
1641 | if (skb->sp) { | |
1642 | int i; | |
1643 | ||
1644 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa HX |
1645 | struct xfrm_state *x = skb->sp->xvec[i]; |
1646 | if (!xfrm_selector_match(&x->sel, &fl, family)) | |
1da177e4 | 1647 | return 0; |
1da177e4 LT |
1648 | } |
1649 | } | |
1650 | ||
1651 | pol = NULL; | |
3bccfbc7 | 1652 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1653 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
3bccfbc7 VY |
1654 | if (IS_ERR(pol)) |
1655 | return 0; | |
1656 | } | |
1da177e4 LT |
1657 | |
1658 | if (!pol) | |
e0d1caa7 | 1659 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1660 | xfrm_policy_lookup); |
1661 | ||
134b0fc5 JM |
1662 | if (IS_ERR(pol)) |
1663 | return 0; | |
1664 | ||
df0ba92a | 1665 | if (!pol) { |
d1d9facf | 1666 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a MN |
1667 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
1668 | return 0; | |
1669 | } | |
1670 | return 1; | |
1671 | } | |
1da177e4 LT |
1672 | |
1673 | pol->curlft.use_time = (unsigned long)xtime.tv_sec; | |
1674 | ||
4e81bb83 MN |
1675 | pols[0] = pol; |
1676 | npols ++; | |
1677 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1678 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1679 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1680 | &fl, family, | |
1681 | XFRM_POLICY_IN); | |
1682 | if (pols[1]) { | |
134b0fc5 JM |
1683 | if (IS_ERR(pols[1])) |
1684 | return 0; | |
4e81bb83 MN |
1685 | pols[1]->curlft.use_time = (unsigned long)xtime.tv_sec; |
1686 | npols ++; | |
1687 | } | |
1688 | } | |
1689 | #endif | |
1690 | ||
1da177e4 LT |
1691 | if (pol->action == XFRM_POLICY_ALLOW) { |
1692 | struct sec_path *sp; | |
1693 | static struct sec_path dummy; | |
4e81bb83 | 1694 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1695 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1696 | struct xfrm_tmpl **tpp = tp; |
1697 | int ti = 0; | |
1da177e4 LT |
1698 | int i, k; |
1699 | ||
1700 | if ((sp = skb->sp) == NULL) | |
1701 | sp = &dummy; | |
1702 | ||
4e81bb83 MN |
1703 | for (pi = 0; pi < npols; pi++) { |
1704 | if (pols[pi] != pol && | |
1705 | pols[pi]->action != XFRM_POLICY_ALLOW) | |
1706 | goto reject; | |
1707 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) | |
1708 | goto reject_error; | |
1709 | for (i = 0; i < pols[pi]->xfrm_nr; i++) | |
1710 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1711 | } | |
1712 | xfrm_nr = ti; | |
41a49cc3 MN |
1713 | if (npols > 1) { |
1714 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
1715 | tpp = stp; | |
1716 | } | |
4e81bb83 | 1717 | |
1da177e4 LT |
1718 | /* For each tunnel xfrm, find the first matching tmpl. |
1719 | * For each tmpl before that, find corresponding xfrm. | |
1720 | * Order is _important_. Later we will implement | |
1721 | * some barriers, but at the moment barriers | |
1722 | * are implied between each two transformations. | |
1723 | */ | |
4e81bb83 MN |
1724 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
1725 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 1726 | if (k < 0) { |
d1d9facf JM |
1727 | if (k < -1) |
1728 | /* "-2 - errored_index" returned */ | |
1729 | xerr_idx = -(2+k); | |
1da177e4 | 1730 | goto reject; |
df0ba92a | 1731 | } |
1da177e4 LT |
1732 | } |
1733 | ||
d1d9facf | 1734 | if (secpath_has_nontransport(sp, k, &xerr_idx)) |
1da177e4 LT |
1735 | goto reject; |
1736 | ||
4e81bb83 | 1737 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1738 | return 1; |
1739 | } | |
1740 | ||
1741 | reject: | |
df0ba92a | 1742 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
1743 | reject_error: |
1744 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
1745 | return 0; |
1746 | } | |
1747 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1748 | ||
1749 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1750 | { | |
1751 | struct flowi fl; | |
1752 | ||
3e3850e9 | 1753 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 LT |
1754 | return 0; |
1755 | ||
1756 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1757 | } | |
1758 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1759 | ||
d49c73c7 DM |
1760 | /* Optimize later using cookies and generation ids. */ |
1761 | ||
1da177e4 LT |
1762 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1763 | { | |
d49c73c7 DM |
1764 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
1765 | * to "-1" to force all XFRM destinations to get validated by | |
1766 | * dst_ops->check on every use. We do this because when a | |
1767 | * normal route referenced by an XFRM dst is obsoleted we do | |
1768 | * not go looking around for all parent referencing XFRM dsts | |
1769 | * so that we can invalidate them. It is just too much work. | |
1770 | * Instead we make the checks here on every use. For example: | |
1771 | * | |
1772 | * XFRM dst A --> IPv4 dst X | |
1773 | * | |
1774 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
1775 | * in this example). If X is marked obsolete, "A" will not | |
1776 | * notice. That's what we are validating here via the | |
1777 | * stale_bundle() check. | |
1778 | * | |
1779 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
1780 | * dst which causes it's ->obsolete field to be set to a | |
1781 | * positive non-zero integer. If an XFRM dst has been pruned | |
1782 | * like this, we want to force a new route lookup. | |
399c180a | 1783 | */ |
d49c73c7 DM |
1784 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
1785 | return dst; | |
1786 | ||
1da177e4 LT |
1787 | return NULL; |
1788 | } | |
1789 | ||
1790 | static int stale_bundle(struct dst_entry *dst) | |
1791 | { | |
5b368e61 | 1792 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
1793 | } |
1794 | ||
aabc9761 | 1795 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 1796 | { |
1da177e4 LT |
1797 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
1798 | dst->dev = &loopback_dev; | |
1799 | dev_hold(&loopback_dev); | |
1800 | dev_put(dev); | |
1801 | } | |
1802 | } | |
aabc9761 | 1803 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
1804 | |
1805 | static void xfrm_link_failure(struct sk_buff *skb) | |
1806 | { | |
1807 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1808 | return; | |
1809 | } | |
1810 | ||
1811 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
1812 | { | |
1813 | if (dst) { | |
1814 | if (dst->obsolete) { | |
1815 | dst_release(dst); | |
1816 | dst = NULL; | |
1817 | } | |
1818 | } | |
1819 | return dst; | |
1820 | } | |
1821 | ||
2518c7c2 DM |
1822 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
1823 | { | |
1824 | struct dst_entry *dst, **dstp; | |
1825 | ||
1826 | write_lock(&pol->lock); | |
1827 | dstp = &pol->bundles; | |
1828 | while ((dst=*dstp) != NULL) { | |
1829 | if (func(dst)) { | |
1830 | *dstp = dst->next; | |
1831 | dst->next = *gc_list_p; | |
1832 | *gc_list_p = dst; | |
1833 | } else { | |
1834 | dstp = &dst->next; | |
1835 | } | |
1836 | } | |
1837 | write_unlock(&pol->lock); | |
1838 | } | |
1839 | ||
1da177e4 LT |
1840 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
1841 | { | |
2518c7c2 DM |
1842 | struct dst_entry *gc_list = NULL; |
1843 | int dir; | |
1da177e4 LT |
1844 | |
1845 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
1846 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
1847 | struct xfrm_policy *pol; | |
1848 | struct hlist_node *entry; | |
1849 | struct hlist_head *table; | |
1850 | int i; | |
4e81bb83 | 1851 | |
2518c7c2 DM |
1852 | hlist_for_each_entry(pol, entry, |
1853 | &xfrm_policy_inexact[dir], bydst) | |
1854 | prune_one_bundle(pol, func, &gc_list); | |
1855 | ||
1856 | table = xfrm_policy_bydst[dir].table; | |
1857 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
1858 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
1859 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
1860 | } |
1861 | } | |
1862 | read_unlock_bh(&xfrm_policy_lock); | |
1863 | ||
1864 | while (gc_list) { | |
2518c7c2 | 1865 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
1866 | gc_list = dst->next; |
1867 | dst_free(dst); | |
1868 | } | |
1869 | } | |
1870 | ||
1871 | static int unused_bundle(struct dst_entry *dst) | |
1872 | { | |
1873 | return !atomic_read(&dst->__refcnt); | |
1874 | } | |
1875 | ||
1876 | static void __xfrm_garbage_collect(void) | |
1877 | { | |
1878 | xfrm_prune_bundles(unused_bundle); | |
1879 | } | |
1880 | ||
1c095399 | 1881 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
1882 | { |
1883 | xfrm_prune_bundles(stale_bundle); | |
1884 | return 0; | |
1885 | } | |
1886 | ||
1887 | void xfrm_init_pmtu(struct dst_entry *dst) | |
1888 | { | |
1889 | do { | |
1890 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1891 | u32 pmtu, route_mtu_cached; | |
1892 | ||
1893 | pmtu = dst_mtu(dst->child); | |
1894 | xdst->child_mtu_cached = pmtu; | |
1895 | ||
1896 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
1897 | ||
1898 | route_mtu_cached = dst_mtu(xdst->route); | |
1899 | xdst->route_mtu_cached = route_mtu_cached; | |
1900 | ||
1901 | if (pmtu > route_mtu_cached) | |
1902 | pmtu = route_mtu_cached; | |
1903 | ||
1904 | dst->metrics[RTAX_MTU-1] = pmtu; | |
1905 | } while ((dst = dst->next)); | |
1906 | } | |
1907 | ||
1908 | EXPORT_SYMBOL(xfrm_init_pmtu); | |
1909 | ||
1910 | /* Check that the bundle accepts the flow and its components are | |
1911 | * still valid. | |
1912 | */ | |
1913 | ||
5b368e61 VY |
1914 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
1915 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
1916 | { |
1917 | struct dst_entry *dst = &first->u.dst; | |
1918 | struct xfrm_dst *last; | |
1919 | u32 mtu; | |
1920 | ||
92d63dec | 1921 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
1922 | (dst->dev && !netif_running(dst->dev))) |
1923 | return 0; | |
1924 | ||
1925 | last = NULL; | |
1926 | ||
1927 | do { | |
1928 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1929 | ||
1930 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
1931 | return 0; | |
67f83cbf VY |
1932 | if (fl && pol && |
1933 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 1934 | return 0; |
1da177e4 LT |
1935 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
1936 | return 0; | |
9d4a706d DM |
1937 | if (xdst->genid != dst->xfrm->genid) |
1938 | return 0; | |
e53820de MN |
1939 | |
1940 | if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL && | |
1941 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) | |
1942 | return 0; | |
1da177e4 LT |
1943 | |
1944 | mtu = dst_mtu(dst->child); | |
1945 | if (xdst->child_mtu_cached != mtu) { | |
1946 | last = xdst; | |
1947 | xdst->child_mtu_cached = mtu; | |
1948 | } | |
1949 | ||
92d63dec | 1950 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
1951 | return 0; |
1952 | mtu = dst_mtu(xdst->route); | |
1953 | if (xdst->route_mtu_cached != mtu) { | |
1954 | last = xdst; | |
1955 | xdst->route_mtu_cached = mtu; | |
1956 | } | |
1957 | ||
1958 | dst = dst->child; | |
1959 | } while (dst->xfrm); | |
1960 | ||
1961 | if (likely(!last)) | |
1962 | return 1; | |
1963 | ||
1964 | mtu = last->child_mtu_cached; | |
1965 | for (;;) { | |
1966 | dst = &last->u.dst; | |
1967 | ||
1968 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
1969 | if (mtu > last->route_mtu_cached) | |
1970 | mtu = last->route_mtu_cached; | |
1971 | dst->metrics[RTAX_MTU-1] = mtu; | |
1972 | ||
1973 | if (last == first) | |
1974 | break; | |
1975 | ||
1976 | last = last->u.next; | |
1977 | last->child_mtu_cached = mtu; | |
1978 | } | |
1979 | ||
1980 | return 1; | |
1981 | } | |
1982 | ||
1983 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
1984 | ||
1da177e4 LT |
1985 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
1986 | { | |
1987 | int err = 0; | |
1988 | if (unlikely(afinfo == NULL)) | |
1989 | return -EINVAL; | |
1990 | if (unlikely(afinfo->family >= NPROTO)) | |
1991 | return -EAFNOSUPPORT; | |
e959d812 | 1992 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
1993 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
1994 | err = -ENOBUFS; | |
1995 | else { | |
1996 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
1997 | if (likely(dst_ops->kmem_cachep == NULL)) | |
1998 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
1999 | if (likely(dst_ops->check == NULL)) | |
2000 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2001 | if (likely(dst_ops->negative_advice == NULL)) |
2002 | dst_ops->negative_advice = xfrm_negative_advice; | |
2003 | if (likely(dst_ops->link_failure == NULL)) | |
2004 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2005 | if (likely(afinfo->garbage_collect == NULL)) |
2006 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2007 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2008 | } | |
e959d812 | 2009 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2010 | return err; |
2011 | } | |
2012 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2013 | ||
2014 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2015 | { | |
2016 | int err = 0; | |
2017 | if (unlikely(afinfo == NULL)) | |
2018 | return -EINVAL; | |
2019 | if (unlikely(afinfo->family >= NPROTO)) | |
2020 | return -EAFNOSUPPORT; | |
e959d812 | 2021 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2022 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2023 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2024 | err = -EINVAL; | |
2025 | else { | |
2026 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2027 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2028 | dst_ops->kmem_cachep = NULL; | |
2029 | dst_ops->check = NULL; | |
1da177e4 LT |
2030 | dst_ops->negative_advice = NULL; |
2031 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2032 | afinfo->garbage_collect = NULL; |
2033 | } | |
2034 | } | |
e959d812 | 2035 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2036 | return err; |
2037 | } | |
2038 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2039 | ||
2040 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2041 | { | |
2042 | struct xfrm_policy_afinfo *afinfo; | |
2043 | if (unlikely(family >= NPROTO)) | |
2044 | return NULL; | |
2045 | read_lock(&xfrm_policy_afinfo_lock); | |
2046 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2047 | if (unlikely(!afinfo)) |
2048 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2049 | return afinfo; |
2050 | } | |
2051 | ||
2052 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2053 | { | |
546be240 HX |
2054 | read_unlock(&xfrm_policy_afinfo_lock); |
2055 | } | |
2056 | ||
2057 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family) | |
2058 | { | |
2059 | struct xfrm_policy_afinfo *afinfo; | |
2060 | if (unlikely(family >= NPROTO)) | |
2061 | return NULL; | |
2062 | write_lock_bh(&xfrm_policy_afinfo_lock); | |
2063 | afinfo = xfrm_policy_afinfo[family]; | |
2064 | if (unlikely(!afinfo)) | |
2065 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
2066 | return afinfo; | |
2067 | } | |
2068 | ||
2069 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2070 | { | |
2071 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2072 | } |
2073 | ||
2074 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
2075 | { | |
2076 | switch (event) { | |
2077 | case NETDEV_DOWN: | |
2078 | xfrm_flush_bundles(); | |
2079 | } | |
2080 | return NOTIFY_DONE; | |
2081 | } | |
2082 | ||
2083 | static struct notifier_block xfrm_dev_notifier = { | |
2084 | xfrm_dev_event, | |
2085 | NULL, | |
2086 | 0 | |
2087 | }; | |
2088 | ||
2089 | static void __init xfrm_policy_init(void) | |
2090 | { | |
2518c7c2 DM |
2091 | unsigned int hmask, sz; |
2092 | int dir; | |
2093 | ||
1da177e4 LT |
2094 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2095 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2096 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
1da177e4 | 2097 | NULL, NULL); |
1da177e4 | 2098 | |
2518c7c2 DM |
2099 | hmask = 8 - 1; |
2100 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2101 | ||
44e36b42 | 2102 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2103 | xfrm_idx_hmask = hmask; |
2104 | if (!xfrm_policy_byidx) | |
2105 | panic("XFRM: failed to allocate byidx hash\n"); | |
2106 | ||
2107 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2108 | struct xfrm_policy_hash *htab; | |
2109 | ||
2110 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2111 | ||
2112 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2113 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2114 | htab->hmask = hmask; |
2115 | if (!htab->table) | |
2116 | panic("XFRM: failed to allocate bydst hash\n"); | |
2117 | } | |
2118 | ||
c4028958 | 2119 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2120 | register_netdevice_notifier(&xfrm_dev_notifier); |
2121 | } | |
2122 | ||
2123 | void __init xfrm_init(void) | |
2124 | { | |
2125 | xfrm_state_init(); | |
2126 | xfrm_policy_init(); | |
2127 | xfrm_input_init(); | |
2128 | } | |
2129 |