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