Commit | Line | Data |
---|---|---|
a716c119 | 1 | /* |
1da177e4 LT |
2 | * xfrm_policy.c |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * Kazunori MIYAZAWA @USAGI | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
1da177e4 LT |
16 | #include <linux/slab.h> |
17 | #include <linux/kmod.h> | |
18 | #include <linux/list.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/workqueue.h> | |
21 | #include <linux/notifier.h> | |
22 | #include <linux/netdevice.h> | |
eb9c7ebe | 23 | #include <linux/netfilter.h> |
1da177e4 | 24 | #include <linux/module.h> |
2518c7c2 | 25 | #include <linux/cache.h> |
1da177e4 LT |
26 | #include <net/xfrm.h> |
27 | #include <net/ip.h> | |
161a09e7 | 28 | #include <linux/audit.h> |
1da177e4 | 29 | |
44e36b42 DM |
30 | #include "xfrm_hash.h" |
31 | ||
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 | 153 | |
a716c119 | 154 | int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, |
1da177e4 LT |
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 | |
a716c119 | 265 | return secs*HZ; |
1da177e4 LT |
266 | } |
267 | ||
268 | static void xfrm_policy_timer(unsigned long data) | |
269 | { | |
270 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 271 | unsigned long now = get_seconds(); |
1da177e4 LT |
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; | |
a6c7ab55 | 653 | struct hlist_node *entry, *newpos; |
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; | |
2518c7c2 | 660 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 661 | if (pol->type == policy->type && |
2518c7c2 | 662 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
663 | xfrm_sec_ctx_match(pol->security, policy->security) && |
664 | !WARN_ON(delpol)) { | |
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) { | |
a6c7ab55 | 673 | newpos = &pol->bydst; |
1da177e4 LT |
674 | continue; |
675 | } | |
1da177e4 LT |
676 | if (delpol) |
677 | break; | |
1da177e4 LT |
678 | } |
679 | if (newpos) | |
2518c7c2 DM |
680 | hlist_add_after(newpos, &policy->bydst); |
681 | else | |
682 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 683 | xfrm_pol_hold(policy); |
2518c7c2 | 684 | xfrm_policy_count[dir]++; |
1da177e4 | 685 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
686 | if (delpol) { |
687 | hlist_del(&delpol->bydst); | |
688 | hlist_del(&delpol->byidx); | |
689 | xfrm_policy_count[dir]--; | |
690 | } | |
4e81bb83 | 691 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 692 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 693 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
694 | policy->curlft.use_time = 0; |
695 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
696 | xfrm_pol_hold(policy); | |
697 | write_unlock_bh(&xfrm_policy_lock); | |
698 | ||
9b78a82c | 699 | if (delpol) |
1da177e4 | 700 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
701 | else if (xfrm_bydst_should_resize(dir, NULL)) |
702 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
703 | |
704 | read_lock_bh(&xfrm_policy_lock); | |
705 | gc_list = NULL; | |
2518c7c2 DM |
706 | entry = &policy->bydst; |
707 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
708 | struct dst_entry *dst; |
709 | ||
710 | write_lock(&policy->lock); | |
711 | dst = policy->bundles; | |
712 | if (dst) { | |
713 | struct dst_entry *tail = dst; | |
714 | while (tail->next) | |
715 | tail = tail->next; | |
716 | tail->next = gc_list; | |
717 | gc_list = dst; | |
718 | ||
719 | policy->bundles = NULL; | |
720 | } | |
721 | write_unlock(&policy->lock); | |
1da177e4 | 722 | } |
9b78a82c DM |
723 | read_unlock_bh(&xfrm_policy_lock); |
724 | ||
725 | while (gc_list) { | |
726 | struct dst_entry *dst = gc_list; | |
727 | ||
728 | gc_list = dst->next; | |
729 | dst_free(dst); | |
730 | } | |
731 | ||
1da177e4 LT |
732 | return 0; |
733 | } | |
734 | EXPORT_SYMBOL(xfrm_policy_insert); | |
735 | ||
4e81bb83 MN |
736 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
737 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
738 | struct xfrm_sec_ctx *ctx, int delete, |
739 | int *err) | |
1da177e4 | 740 | { |
2518c7c2 DM |
741 | struct xfrm_policy *pol, *ret; |
742 | struct hlist_head *chain; | |
743 | struct hlist_node *entry; | |
1da177e4 | 744 | |
ef41aaa0 | 745 | *err = 0; |
1da177e4 | 746 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
747 | chain = policy_hash_bysel(sel, sel->family, dir); |
748 | ret = NULL; | |
749 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
750 | if (pol->type == type && | |
751 | !selector_cmp(sel, &pol->selector) && | |
752 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 753 | xfrm_pol_hold(pol); |
2518c7c2 | 754 | if (delete) { |
ef41aaa0 EP |
755 | *err = security_xfrm_policy_delete(pol); |
756 | if (*err) { | |
757 | write_unlock_bh(&xfrm_policy_lock); | |
758 | return pol; | |
759 | } | |
2518c7c2 DM |
760 | hlist_del(&pol->bydst); |
761 | hlist_del(&pol->byidx); | |
762 | xfrm_policy_count[dir]--; | |
763 | } | |
764 | ret = pol; | |
1da177e4 LT |
765 | break; |
766 | } | |
767 | } | |
768 | write_unlock_bh(&xfrm_policy_lock); | |
769 | ||
2518c7c2 | 770 | if (ret && delete) { |
1da177e4 | 771 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 772 | xfrm_policy_kill(ret); |
1da177e4 | 773 | } |
2518c7c2 | 774 | return ret; |
1da177e4 | 775 | } |
df71837d | 776 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 777 | |
ef41aaa0 EP |
778 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
779 | int *err) | |
1da177e4 | 780 | { |
2518c7c2 DM |
781 | struct xfrm_policy *pol, *ret; |
782 | struct hlist_head *chain; | |
783 | struct hlist_node *entry; | |
1da177e4 | 784 | |
ef41aaa0 | 785 | *err = 0; |
1da177e4 | 786 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
787 | chain = xfrm_policy_byidx + idx_hash(id); |
788 | ret = NULL; | |
789 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
790 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 791 | xfrm_pol_hold(pol); |
2518c7c2 | 792 | if (delete) { |
ef41aaa0 EP |
793 | *err = security_xfrm_policy_delete(pol); |
794 | if (*err) { | |
795 | write_unlock_bh(&xfrm_policy_lock); | |
796 | return pol; | |
797 | } | |
2518c7c2 DM |
798 | hlist_del(&pol->bydst); |
799 | hlist_del(&pol->byidx); | |
800 | xfrm_policy_count[dir]--; | |
801 | } | |
802 | ret = pol; | |
1da177e4 LT |
803 | break; |
804 | } | |
805 | } | |
806 | write_unlock_bh(&xfrm_policy_lock); | |
807 | ||
2518c7c2 | 808 | if (ret && delete) { |
1da177e4 | 809 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 810 | xfrm_policy_kill(ret); |
1da177e4 | 811 | } |
2518c7c2 | 812 | return ret; |
1da177e4 LT |
813 | } |
814 | EXPORT_SYMBOL(xfrm_policy_byid); | |
815 | ||
161a09e7 | 816 | void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 817 | { |
1da177e4 LT |
818 | int dir; |
819 | ||
820 | write_lock_bh(&xfrm_policy_lock); | |
821 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
822 | struct xfrm_policy *pol; |
823 | struct hlist_node *entry; | |
ae8c0577 | 824 | int i, killed; |
2518c7c2 | 825 | |
ae8c0577 | 826 | killed = 0; |
2518c7c2 DM |
827 | again1: |
828 | hlist_for_each_entry(pol, entry, | |
829 | &xfrm_policy_inexact[dir], bydst) { | |
830 | if (pol->type != type) | |
831 | continue; | |
832 | hlist_del(&pol->bydst); | |
833 | hlist_del(&pol->byidx); | |
1da177e4 LT |
834 | write_unlock_bh(&xfrm_policy_lock); |
835 | ||
161a09e7 JL |
836 | xfrm_audit_log(audit_info->loginuid, audit_info->secid, |
837 | AUDIT_MAC_IPSEC_DELSPD, 1, pol, NULL); | |
838 | ||
2518c7c2 | 839 | xfrm_policy_kill(pol); |
ae8c0577 | 840 | killed++; |
1da177e4 LT |
841 | |
842 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
843 | goto again1; |
844 | } | |
845 | ||
846 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
847 | again2: | |
848 | hlist_for_each_entry(pol, entry, | |
849 | xfrm_policy_bydst[dir].table + i, | |
850 | bydst) { | |
851 | if (pol->type != type) | |
852 | continue; | |
853 | hlist_del(&pol->bydst); | |
854 | hlist_del(&pol->byidx); | |
855 | write_unlock_bh(&xfrm_policy_lock); | |
856 | ||
161a09e7 JL |
857 | xfrm_audit_log(audit_info->loginuid, |
858 | audit_info->secid, | |
859 | AUDIT_MAC_IPSEC_DELSPD, 1, | |
860 | pol, NULL); | |
861 | ||
2518c7c2 | 862 | xfrm_policy_kill(pol); |
ae8c0577 | 863 | killed++; |
2518c7c2 DM |
864 | |
865 | write_lock_bh(&xfrm_policy_lock); | |
866 | goto again2; | |
867 | } | |
1da177e4 | 868 | } |
2518c7c2 | 869 | |
ae8c0577 | 870 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
871 | } |
872 | atomic_inc(&flow_cache_genid); | |
873 | write_unlock_bh(&xfrm_policy_lock); | |
874 | } | |
875 | EXPORT_SYMBOL(xfrm_policy_flush); | |
876 | ||
4e81bb83 | 877 | int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
878 | void *data) |
879 | { | |
baf5d743 | 880 | struct xfrm_policy *pol, *last = NULL; |
2518c7c2 | 881 | struct hlist_node *entry; |
baf5d743 | 882 | int dir, last_dir = 0, count, error; |
1da177e4 LT |
883 | |
884 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 | 885 | count = 0; |
1da177e4 LT |
886 | |
887 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
888 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
889 | int i; | |
890 | ||
891 | hlist_for_each_entry(pol, entry, | |
892 | &xfrm_policy_inexact[dir], bydst) { | |
893 | if (pol->type != type) | |
894 | continue; | |
baf5d743 JHS |
895 | if (last) { |
896 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
897 | count, data); | |
898 | if (error) | |
899 | goto out; | |
900 | } | |
901 | last = pol; | |
902 | last_dir = dir; | |
903 | count++; | |
1da177e4 | 904 | } |
2518c7c2 DM |
905 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
906 | hlist_for_each_entry(pol, entry, table + i, bydst) { | |
907 | if (pol->type != type) | |
908 | continue; | |
baf5d743 JHS |
909 | if (last) { |
910 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
911 | count, data); | |
912 | if (error) | |
913 | goto out; | |
914 | } | |
915 | last = pol; | |
916 | last_dir = dir; | |
917 | count++; | |
2518c7c2 DM |
918 | } |
919 | } | |
1da177e4 | 920 | } |
baf5d743 JHS |
921 | if (count == 0) { |
922 | error = -ENOENT; | |
923 | goto out; | |
924 | } | |
925 | error = func(last, last_dir % XFRM_POLICY_MAX, 0, data); | |
1da177e4 LT |
926 | out: |
927 | read_unlock_bh(&xfrm_policy_lock); | |
928 | return error; | |
929 | } | |
930 | EXPORT_SYMBOL(xfrm_policy_walk); | |
931 | ||
134b0fc5 JM |
932 | /* |
933 | * Find policy to apply to this flow. | |
934 | * | |
935 | * Returns 0 if policy found, else an -errno. | |
936 | */ | |
2518c7c2 DM |
937 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
938 | u8 type, u16 family, int dir) | |
1da177e4 | 939 | { |
2518c7c2 | 940 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 941 | int match, ret = -ESRCH; |
1da177e4 | 942 | |
2518c7c2 DM |
943 | if (pol->family != family || |
944 | pol->type != type) | |
134b0fc5 | 945 | return ret; |
1da177e4 | 946 | |
2518c7c2 | 947 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 JM |
948 | if (match) |
949 | ret = security_xfrm_policy_lookup(pol, fl->secid, dir); | |
2518c7c2 | 950 | |
134b0fc5 | 951 | return ret; |
2518c7c2 | 952 | } |
1da177e4 | 953 | |
2518c7c2 DM |
954 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
955 | u16 family, u8 dir) | |
956 | { | |
134b0fc5 | 957 | int err; |
2518c7c2 DM |
958 | struct xfrm_policy *pol, *ret; |
959 | xfrm_address_t *daddr, *saddr; | |
960 | struct hlist_node *entry; | |
961 | struct hlist_head *chain; | |
acba48e1 | 962 | u32 priority = ~0U; |
df71837d | 963 | |
2518c7c2 DM |
964 | daddr = xfrm_flowi_daddr(fl, family); |
965 | saddr = xfrm_flowi_saddr(fl, family); | |
966 | if (unlikely(!daddr || !saddr)) | |
967 | return NULL; | |
968 | ||
969 | read_lock_bh(&xfrm_policy_lock); | |
970 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
971 | ret = NULL; | |
972 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
973 | err = xfrm_policy_match(pol, fl, type, family, dir); |
974 | if (err) { | |
975 | if (err == -ESRCH) | |
976 | continue; | |
977 | else { | |
978 | ret = ERR_PTR(err); | |
979 | goto fail; | |
980 | } | |
981 | } else { | |
2518c7c2 | 982 | ret = pol; |
acba48e1 | 983 | priority = ret->priority; |
2518c7c2 DM |
984 | break; |
985 | } | |
986 | } | |
acba48e1 DM |
987 | chain = &xfrm_policy_inexact[dir]; |
988 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
989 | err = xfrm_policy_match(pol, fl, type, family, dir); |
990 | if (err) { | |
991 | if (err == -ESRCH) | |
992 | continue; | |
993 | else { | |
994 | ret = ERR_PTR(err); | |
995 | goto fail; | |
996 | } | |
997 | } else if (pol->priority < priority) { | |
acba48e1 DM |
998 | ret = pol; |
999 | break; | |
1da177e4 LT |
1000 | } |
1001 | } | |
acba48e1 DM |
1002 | if (ret) |
1003 | xfrm_pol_hold(ret); | |
134b0fc5 | 1004 | fail: |
1da177e4 | 1005 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 1006 | |
2518c7c2 | 1007 | return ret; |
4e81bb83 MN |
1008 | } |
1009 | ||
134b0fc5 | 1010 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
1011 | void **objp, atomic_t **obj_refp) |
1012 | { | |
1013 | struct xfrm_policy *pol; | |
134b0fc5 | 1014 | int err = 0; |
4e81bb83 MN |
1015 | |
1016 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1017 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
1018 | if (IS_ERR(pol)) { |
1019 | err = PTR_ERR(pol); | |
1020 | pol = NULL; | |
1021 | } | |
1022 | if (pol || err) | |
4e81bb83 MN |
1023 | goto end; |
1024 | #endif | |
1025 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
1026 | if (IS_ERR(pol)) { |
1027 | err = PTR_ERR(pol); | |
1028 | pol = NULL; | |
1029 | } | |
4e81bb83 | 1030 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1031 | end: |
4e81bb83 | 1032 | #endif |
1da177e4 LT |
1033 | if ((*objp = (void *) pol) != NULL) |
1034 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1035 | return err; |
1da177e4 LT |
1036 | } |
1037 | ||
df71837d TJ |
1038 | static inline int policy_to_flow_dir(int dir) |
1039 | { | |
1040 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1041 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1042 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1043 | return dir; | |
1044 | switch (dir) { | |
1045 | default: | |
1046 | case XFRM_POLICY_IN: | |
1047 | return FLOW_DIR_IN; | |
1048 | case XFRM_POLICY_OUT: | |
1049 | return FLOW_DIR_OUT; | |
1050 | case XFRM_POLICY_FWD: | |
1051 | return FLOW_DIR_FWD; | |
3ff50b79 | 1052 | } |
df71837d TJ |
1053 | } |
1054 | ||
e0d1caa7 | 1055 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1056 | { |
1057 | struct xfrm_policy *pol; | |
1058 | ||
1059 | read_lock_bh(&xfrm_policy_lock); | |
1060 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1061 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1062 | sk->sk_family); |
a716c119 | 1063 | int err = 0; |
df71837d | 1064 | |
3bccfbc7 VY |
1065 | if (match) { |
1066 | err = security_xfrm_policy_lookup(pol, fl->secid, | |
1067 | policy_to_flow_dir(dir)); | |
1068 | if (!err) | |
1069 | xfrm_pol_hold(pol); | |
1070 | else if (err == -ESRCH) | |
1071 | pol = NULL; | |
1072 | else | |
1073 | pol = ERR_PTR(err); | |
1074 | } else | |
1da177e4 LT |
1075 | pol = NULL; |
1076 | } | |
1077 | read_unlock_bh(&xfrm_policy_lock); | |
1078 | return pol; | |
1079 | } | |
1080 | ||
1081 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1082 | { | |
2518c7c2 DM |
1083 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1084 | pol->family, dir); | |
4e81bb83 | 1085 | |
2518c7c2 DM |
1086 | hlist_add_head(&pol->bydst, chain); |
1087 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1088 | xfrm_policy_count[dir]++; | |
1da177e4 | 1089 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1090 | |
1091 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1092 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1093 | } |
1094 | ||
1095 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1096 | int dir) | |
1097 | { | |
2518c7c2 DM |
1098 | if (hlist_unhashed(&pol->bydst)) |
1099 | return NULL; | |
1da177e4 | 1100 | |
2518c7c2 DM |
1101 | hlist_del(&pol->bydst); |
1102 | hlist_del(&pol->byidx); | |
1103 | xfrm_policy_count[dir]--; | |
1104 | ||
1105 | return pol; | |
1da177e4 LT |
1106 | } |
1107 | ||
4666faab | 1108 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1109 | { |
1110 | write_lock_bh(&xfrm_policy_lock); | |
1111 | pol = __xfrm_policy_unlink(pol, dir); | |
1112 | write_unlock_bh(&xfrm_policy_lock); | |
1113 | if (pol) { | |
1114 | if (dir < XFRM_POLICY_MAX) | |
1115 | atomic_inc(&flow_cache_genid); | |
1116 | xfrm_policy_kill(pol); | |
4666faab | 1117 | return 0; |
1da177e4 | 1118 | } |
4666faab | 1119 | return -ENOENT; |
1da177e4 | 1120 | } |
a70fcb0b | 1121 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1122 | |
1123 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1124 | { | |
1125 | struct xfrm_policy *old_pol; | |
1126 | ||
4e81bb83 MN |
1127 | #ifdef CONFIG_XFRM_SUB_POLICY |
1128 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1129 | return -EINVAL; | |
1130 | #endif | |
1131 | ||
1da177e4 LT |
1132 | write_lock_bh(&xfrm_policy_lock); |
1133 | old_pol = sk->sk_policy[dir]; | |
1134 | sk->sk_policy[dir] = pol; | |
1135 | if (pol) { | |
9d729f72 | 1136 | pol->curlft.add_time = get_seconds(); |
4e81bb83 | 1137 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1138 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1139 | } | |
1140 | if (old_pol) | |
1141 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1142 | write_unlock_bh(&xfrm_policy_lock); | |
1143 | ||
1144 | if (old_pol) { | |
1145 | xfrm_policy_kill(old_pol); | |
1146 | } | |
1147 | return 0; | |
1148 | } | |
1149 | ||
1150 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1151 | { | |
1152 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1153 | ||
1154 | if (newp) { | |
1155 | newp->selector = old->selector; | |
df71837d TJ |
1156 | if (security_xfrm_policy_clone(old, newp)) { |
1157 | kfree(newp); | |
1158 | return NULL; /* ENOMEM */ | |
1159 | } | |
1da177e4 LT |
1160 | newp->lft = old->lft; |
1161 | newp->curlft = old->curlft; | |
1162 | newp->action = old->action; | |
1163 | newp->flags = old->flags; | |
1164 | newp->xfrm_nr = old->xfrm_nr; | |
1165 | newp->index = old->index; | |
4e81bb83 | 1166 | newp->type = old->type; |
1da177e4 LT |
1167 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1168 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1169 | write_lock_bh(&xfrm_policy_lock); | |
1170 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1171 | write_unlock_bh(&xfrm_policy_lock); | |
1172 | xfrm_pol_put(newp); | |
1173 | } | |
1174 | return newp; | |
1175 | } | |
1176 | ||
1177 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1178 | { | |
1179 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1180 | *p1 = sk->sk_policy[1]; | |
1181 | ||
1182 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1183 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1184 | return -ENOMEM; | |
1185 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1186 | return -ENOMEM; | |
1187 | return 0; | |
1188 | } | |
1189 | ||
a1e59abf PM |
1190 | static int |
1191 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1192 | unsigned short family) | |
1193 | { | |
1194 | int err; | |
1195 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1196 | ||
1197 | if (unlikely(afinfo == NULL)) | |
1198 | return -EINVAL; | |
1199 | err = afinfo->get_saddr(local, remote); | |
1200 | xfrm_policy_put_afinfo(afinfo); | |
1201 | return err; | |
1202 | } | |
1203 | ||
1da177e4 LT |
1204 | /* Resolve list of templates for the flow, given policy. */ |
1205 | ||
1206 | static int | |
4e81bb83 MN |
1207 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1208 | struct xfrm_state **xfrm, | |
1209 | unsigned short family) | |
1da177e4 LT |
1210 | { |
1211 | int nx; | |
1212 | int i, error; | |
1213 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1214 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1215 | xfrm_address_t tmp; |
1da177e4 LT |
1216 | |
1217 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1218 | struct xfrm_state *x; | |
1219 | xfrm_address_t *remote = daddr; | |
1220 | xfrm_address_t *local = saddr; | |
1221 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1222 | ||
7e49e6de | 1223 | if (tmpl->mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
1224 | remote = &tmpl->id.daddr; |
1225 | local = &tmpl->saddr; | |
76b3f055 | 1226 | family = tmpl->encap_family; |
a1e59abf PM |
1227 | if (xfrm_addr_any(local, family)) { |
1228 | error = xfrm_get_saddr(&tmp, remote, family); | |
1229 | if (error) | |
1230 | goto fail; | |
1231 | local = &tmp; | |
1232 | } | |
1da177e4 LT |
1233 | } |
1234 | ||
1235 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1236 | ||
1237 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1238 | xfrm[nx++] = x; | |
1239 | daddr = remote; | |
1240 | saddr = local; | |
1241 | continue; | |
1242 | } | |
1243 | if (x) { | |
1244 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1245 | -EINVAL : -EAGAIN); | |
1246 | xfrm_state_put(x); | |
1247 | } | |
1248 | ||
1249 | if (!tmpl->optional) | |
1250 | goto fail; | |
1251 | } | |
1252 | return nx; | |
1253 | ||
1254 | fail: | |
1255 | for (nx--; nx>=0; nx--) | |
1256 | xfrm_state_put(xfrm[nx]); | |
1257 | return error; | |
1258 | } | |
1259 | ||
4e81bb83 MN |
1260 | static int |
1261 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1262 | struct xfrm_state **xfrm, | |
1263 | unsigned short family) | |
1264 | { | |
41a49cc3 MN |
1265 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1266 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1267 | int cnx = 0; |
1268 | int error; | |
1269 | int ret; | |
1270 | int i; | |
1271 | ||
1272 | for (i = 0; i < npols; i++) { | |
1273 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1274 | error = -ENOBUFS; | |
1275 | goto fail; | |
1276 | } | |
41a49cc3 MN |
1277 | |
1278 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1279 | if (ret < 0) { |
1280 | error = ret; | |
1281 | goto fail; | |
1282 | } else | |
1283 | cnx += ret; | |
1284 | } | |
1285 | ||
41a49cc3 MN |
1286 | /* found states are sorted for outbound processing */ |
1287 | if (npols > 1) | |
1288 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1289 | ||
4e81bb83 MN |
1290 | return cnx; |
1291 | ||
1292 | fail: | |
1293 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1294 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1295 | return error; |
1296 | ||
1297 | } | |
1298 | ||
1da177e4 LT |
1299 | /* Check that the bundle accepts the flow and its components are |
1300 | * still valid. | |
1301 | */ | |
1302 | ||
1303 | static struct dst_entry * | |
1304 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1305 | { | |
1306 | struct dst_entry *x; | |
1307 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1308 | if (unlikely(afinfo == NULL)) | |
1309 | return ERR_PTR(-EINVAL); | |
1310 | x = afinfo->find_bundle(fl, policy); | |
1311 | xfrm_policy_put_afinfo(afinfo); | |
1312 | return x; | |
1313 | } | |
1314 | ||
1315 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate | |
1316 | * all the metrics... Shortly, bundle a bundle. | |
1317 | */ | |
1318 | ||
1319 | static int | |
1320 | xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, | |
1321 | struct flowi *fl, struct dst_entry **dst_p, | |
1322 | unsigned short family) | |
1323 | { | |
1324 | int err; | |
1325 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1326 | if (unlikely(afinfo == NULL)) | |
1327 | return -EINVAL; | |
1328 | err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p); | |
1329 | xfrm_policy_put_afinfo(afinfo); | |
1330 | return err; | |
1331 | } | |
1332 | ||
1da177e4 LT |
1333 | |
1334 | static int stale_bundle(struct dst_entry *dst); | |
1335 | ||
1336 | /* Main function: finds/creates a bundle for given flow. | |
1337 | * | |
1338 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1339 | * on interfaces with disabled IPsec. | |
1340 | */ | |
1341 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1342 | struct sock *sk, int flags) | |
1343 | { | |
1344 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1345 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1346 | int npols; | |
1347 | int pol_dead; | |
1348 | int xfrm_nr; | |
1349 | int pi; | |
1da177e4 LT |
1350 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1351 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1352 | int nx = 0; | |
1353 | int err; | |
1354 | u32 genid; | |
42cf93cd | 1355 | u16 family; |
df71837d | 1356 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1357 | |
1da177e4 LT |
1358 | restart: |
1359 | genid = atomic_read(&flow_cache_genid); | |
1360 | policy = NULL; | |
4e81bb83 MN |
1361 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1362 | pols[pi] = NULL; | |
1363 | npols = 0; | |
1364 | pol_dead = 0; | |
1365 | xfrm_nr = 0; | |
1366 | ||
3bccfbc7 | 1367 | if (sk && sk->sk_policy[1]) { |
e0d1caa7 | 1368 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
3bccfbc7 VY |
1369 | if (IS_ERR(policy)) |
1370 | return PTR_ERR(policy); | |
1371 | } | |
1da177e4 LT |
1372 | |
1373 | if (!policy) { | |
1374 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1375 | if ((dst_orig->flags & DST_NOXFRM) || |
1376 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
1da177e4 LT |
1377 | return 0; |
1378 | ||
e0d1caa7 | 1379 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1380 | dir, xfrm_policy_lookup); |
134b0fc5 JM |
1381 | if (IS_ERR(policy)) |
1382 | return PTR_ERR(policy); | |
1da177e4 LT |
1383 | } |
1384 | ||
1385 | if (!policy) | |
1386 | return 0; | |
1387 | ||
42cf93cd | 1388 | family = dst_orig->ops->family; |
9d729f72 | 1389 | policy->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1390 | pols[0] = policy; |
1391 | npols ++; | |
1392 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 LT |
1393 | |
1394 | switch (policy->action) { | |
1395 | case XFRM_POLICY_BLOCK: | |
1396 | /* Prohibit the flow */ | |
e104411b PM |
1397 | err = -EPERM; |
1398 | goto error; | |
1da177e4 LT |
1399 | |
1400 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1401 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1402 | if (policy->xfrm_nr == 0) { |
1403 | /* Flow passes not transformed. */ | |
1404 | xfrm_pol_put(policy); | |
1405 | return 0; | |
1406 | } | |
4e81bb83 | 1407 | #endif |
1da177e4 LT |
1408 | |
1409 | /* Try to find matching bundle. | |
1410 | * | |
1411 | * LATER: help from flow cache. It is optional, this | |
1412 | * is required only for output policy. | |
1413 | */ | |
1414 | dst = xfrm_find_bundle(fl, policy, family); | |
1415 | if (IS_ERR(dst)) { | |
e104411b PM |
1416 | err = PTR_ERR(dst); |
1417 | goto error; | |
1da177e4 LT |
1418 | } |
1419 | ||
1420 | if (dst) | |
1421 | break; | |
1422 | ||
4e81bb83 MN |
1423 | #ifdef CONFIG_XFRM_SUB_POLICY |
1424 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1425 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1426 | fl, family, | |
1427 | XFRM_POLICY_OUT); | |
1428 | if (pols[1]) { | |
134b0fc5 JM |
1429 | if (IS_ERR(pols[1])) { |
1430 | err = PTR_ERR(pols[1]); | |
1431 | goto error; | |
1432 | } | |
4e81bb83 MN |
1433 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
1434 | err = -EPERM; | |
1435 | goto error; | |
1436 | } | |
1437 | npols ++; | |
1438 | xfrm_nr += pols[1]->xfrm_nr; | |
1439 | } | |
1440 | } | |
1441 | ||
1442 | /* | |
1443 | * Because neither flowi nor bundle information knows about | |
1444 | * transformation template size. On more than one policy usage | |
1445 | * we can realize whether all of them is bypass or not after | |
1446 | * they are searched. See above not-transformed bypass | |
1447 | * is surrounded by non-sub policy configuration, too. | |
1448 | */ | |
1449 | if (xfrm_nr == 0) { | |
1450 | /* Flow passes not transformed. */ | |
1451 | xfrm_pols_put(pols, npols); | |
1452 | return 0; | |
1453 | } | |
1454 | ||
1455 | #endif | |
1456 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1457 | |
1458 | if (unlikely(nx<0)) { | |
1459 | err = nx; | |
1460 | if (err == -EAGAIN && flags) { | |
1461 | DECLARE_WAITQUEUE(wait, current); | |
1462 | ||
1463 | add_wait_queue(&km_waitq, &wait); | |
1464 | set_current_state(TASK_INTERRUPTIBLE); | |
1465 | schedule(); | |
1466 | set_current_state(TASK_RUNNING); | |
1467 | remove_wait_queue(&km_waitq, &wait); | |
1468 | ||
4e81bb83 | 1469 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1470 | |
1471 | if (nx == -EAGAIN && signal_pending(current)) { | |
1472 | err = -ERESTART; | |
1473 | goto error; | |
1474 | } | |
1475 | if (nx == -EAGAIN || | |
1476 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1477 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1478 | goto restart; |
1479 | } | |
1480 | err = nx; | |
1481 | } | |
1482 | if (err < 0) | |
1483 | goto error; | |
1484 | } | |
1485 | if (nx == 0) { | |
1486 | /* Flow passes not transformed. */ | |
4e81bb83 | 1487 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1488 | return 0; |
1489 | } | |
1490 | ||
1491 | dst = dst_orig; | |
1492 | err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family); | |
1493 | ||
1494 | if (unlikely(err)) { | |
1495 | int i; | |
1496 | for (i=0; i<nx; i++) | |
1497 | xfrm_state_put(xfrm[i]); | |
1498 | goto error; | |
1499 | } | |
1500 | ||
4e81bb83 MN |
1501 | for (pi = 0; pi < npols; pi++) { |
1502 | read_lock_bh(&pols[pi]->lock); | |
1503 | pol_dead |= pols[pi]->dead; | |
1504 | read_unlock_bh(&pols[pi]->lock); | |
1505 | } | |
1506 | ||
1da177e4 | 1507 | write_lock_bh(&policy->lock); |
4e81bb83 | 1508 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1509 | /* Wow! While we worked on resolving, this |
1510 | * policy has gone. Retry. It is not paranoia, | |
1511 | * we just cannot enlist new bundle to dead object. | |
1512 | * We can't enlist stable bundles either. | |
1513 | */ | |
1514 | write_unlock_bh(&policy->lock); | |
1da177e4 LT |
1515 | if (dst) |
1516 | dst_free(dst); | |
00de651d HX |
1517 | |
1518 | err = -EHOSTUNREACH; | |
1519 | goto error; | |
1da177e4 LT |
1520 | } |
1521 | dst->next = policy->bundles; | |
1522 | policy->bundles = dst; | |
1523 | dst_hold(dst); | |
1524 | write_unlock_bh(&policy->lock); | |
1525 | } | |
1526 | *dst_p = dst; | |
1527 | dst_release(dst_orig); | |
a716c119 | 1528 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1529 | return 0; |
1530 | ||
1531 | error: | |
1532 | dst_release(dst_orig); | |
4e81bb83 | 1533 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1534 | *dst_p = NULL; |
1535 | return err; | |
1536 | } | |
1537 | EXPORT_SYMBOL(xfrm_lookup); | |
1538 | ||
df0ba92a MN |
1539 | static inline int |
1540 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1541 | { | |
1542 | struct xfrm_state *x; | |
1543 | int err; | |
1544 | ||
1545 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1546 | return 0; | |
1547 | x = skb->sp->xvec[idx]; | |
1548 | if (!x->type->reject) | |
1549 | return 0; | |
1550 | xfrm_state_hold(x); | |
1551 | err = x->type->reject(x, skb, fl); | |
1552 | xfrm_state_put(x); | |
1553 | return err; | |
1554 | } | |
1555 | ||
1da177e4 LT |
1556 | /* When skb is transformed back to its "native" form, we have to |
1557 | * check policy restrictions. At the moment we make this in maximally | |
1558 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1559 | * have policy cached at them. | |
1560 | */ | |
1561 | ||
1562 | static inline int | |
a716c119 | 1563 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1564 | unsigned short family) |
1565 | { | |
1566 | if (xfrm_state_kern(x)) | |
928ba416 | 1567 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1568 | return x->id.proto == tmpl->id.proto && |
1569 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1570 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1571 | x->props.mode == tmpl->mode && | |
f3bd4840 MN |
1572 | ((tmpl->aalgos & (1<<x->props.aalgo)) || |
1573 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && | |
7e49e6de MN |
1574 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1575 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1576 | } |
1577 | ||
df0ba92a MN |
1578 | /* |
1579 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1580 | * because of optional transport mode, or next index of the mathced secpath | |
1581 | * state with the template. | |
1582 | * -1 is returned when no matching template is found. | |
1583 | * Otherwise "-2 - errored_index" is returned. | |
1584 | */ | |
1da177e4 LT |
1585 | static inline int |
1586 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1587 | unsigned short family) | |
1588 | { | |
1589 | int idx = start; | |
1590 | ||
1591 | if (tmpl->optional) { | |
7e49e6de | 1592 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1593 | return start; |
1594 | } else | |
1595 | start = -1; | |
1596 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1597 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1598 | return ++idx; |
df0ba92a MN |
1599 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1600 | if (start == -1) | |
1601 | start = -2-idx; | |
1da177e4 | 1602 | break; |
df0ba92a | 1603 | } |
1da177e4 LT |
1604 | } |
1605 | return start; | |
1606 | } | |
1607 | ||
3e3850e9 PM |
1608 | int |
1609 | xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family) | |
1da177e4 LT |
1610 | { |
1611 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1612 | int err; |
1da177e4 LT |
1613 | |
1614 | if (unlikely(afinfo == NULL)) | |
1615 | return -EAFNOSUPPORT; | |
1616 | ||
1617 | afinfo->decode_session(skb, fl); | |
beb8d13b | 1618 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1619 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1620 | return err; |
1da177e4 | 1621 | } |
3e3850e9 | 1622 | EXPORT_SYMBOL(xfrm_decode_session); |
1da177e4 | 1623 | |
df0ba92a | 1624 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1625 | { |
1626 | for (; k < sp->len; k++) { | |
df0ba92a | 1627 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1628 | *idxp = k; |
1da177e4 | 1629 | return 1; |
df0ba92a | 1630 | } |
1da177e4 LT |
1631 | } |
1632 | ||
1633 | return 0; | |
1634 | } | |
1635 | ||
a716c119 | 1636 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1637 | unsigned short family) |
1638 | { | |
1639 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1640 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1641 | int npols = 0; | |
1642 | int xfrm_nr; | |
1643 | int pi; | |
1da177e4 | 1644 | struct flowi fl; |
df71837d | 1645 | u8 fl_dir = policy_to_flow_dir(dir); |
df0ba92a | 1646 | int xerr_idx = -1; |
1da177e4 | 1647 | |
3e3850e9 | 1648 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 | 1649 | return 0; |
eb9c7ebe | 1650 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1651 | |
1652 | /* First, check used SA against their selectors. */ | |
1653 | if (skb->sp) { | |
1654 | int i; | |
1655 | ||
1656 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa HX |
1657 | struct xfrm_state *x = skb->sp->xvec[i]; |
1658 | if (!xfrm_selector_match(&x->sel, &fl, family)) | |
1da177e4 | 1659 | return 0; |
1da177e4 LT |
1660 | } |
1661 | } | |
1662 | ||
1663 | pol = NULL; | |
3bccfbc7 | 1664 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1665 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
3bccfbc7 VY |
1666 | if (IS_ERR(pol)) |
1667 | return 0; | |
1668 | } | |
1da177e4 LT |
1669 | |
1670 | if (!pol) | |
e0d1caa7 | 1671 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1672 | xfrm_policy_lookup); |
1673 | ||
134b0fc5 JM |
1674 | if (IS_ERR(pol)) |
1675 | return 0; | |
1676 | ||
df0ba92a | 1677 | if (!pol) { |
d1d9facf | 1678 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a MN |
1679 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
1680 | return 0; | |
1681 | } | |
1682 | return 1; | |
1683 | } | |
1da177e4 | 1684 | |
9d729f72 | 1685 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1686 | |
4e81bb83 MN |
1687 | pols[0] = pol; |
1688 | npols ++; | |
1689 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1690 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1691 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1692 | &fl, family, | |
1693 | XFRM_POLICY_IN); | |
1694 | if (pols[1]) { | |
134b0fc5 JM |
1695 | if (IS_ERR(pols[1])) |
1696 | return 0; | |
9d729f72 | 1697 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1698 | npols ++; |
1699 | } | |
1700 | } | |
1701 | #endif | |
1702 | ||
1da177e4 LT |
1703 | if (pol->action == XFRM_POLICY_ALLOW) { |
1704 | struct sec_path *sp; | |
1705 | static struct sec_path dummy; | |
4e81bb83 | 1706 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1707 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1708 | struct xfrm_tmpl **tpp = tp; |
1709 | int ti = 0; | |
1da177e4 LT |
1710 | int i, k; |
1711 | ||
1712 | if ((sp = skb->sp) == NULL) | |
1713 | sp = &dummy; | |
1714 | ||
4e81bb83 MN |
1715 | for (pi = 0; pi < npols; pi++) { |
1716 | if (pols[pi] != pol && | |
1717 | pols[pi]->action != XFRM_POLICY_ALLOW) | |
1718 | goto reject; | |
1719 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) | |
1720 | goto reject_error; | |
1721 | for (i = 0; i < pols[pi]->xfrm_nr; i++) | |
1722 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1723 | } | |
1724 | xfrm_nr = ti; | |
41a49cc3 MN |
1725 | if (npols > 1) { |
1726 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
1727 | tpp = stp; | |
1728 | } | |
4e81bb83 | 1729 | |
1da177e4 LT |
1730 | /* For each tunnel xfrm, find the first matching tmpl. |
1731 | * For each tmpl before that, find corresponding xfrm. | |
1732 | * Order is _important_. Later we will implement | |
1733 | * some barriers, but at the moment barriers | |
1734 | * are implied between each two transformations. | |
1735 | */ | |
4e81bb83 MN |
1736 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
1737 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 1738 | if (k < 0) { |
d1d9facf JM |
1739 | if (k < -1) |
1740 | /* "-2 - errored_index" returned */ | |
1741 | xerr_idx = -(2+k); | |
1da177e4 | 1742 | goto reject; |
df0ba92a | 1743 | } |
1da177e4 LT |
1744 | } |
1745 | ||
d1d9facf | 1746 | if (secpath_has_nontransport(sp, k, &xerr_idx)) |
1da177e4 LT |
1747 | goto reject; |
1748 | ||
4e81bb83 | 1749 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1750 | return 1; |
1751 | } | |
1752 | ||
1753 | reject: | |
df0ba92a | 1754 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
1755 | reject_error: |
1756 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
1757 | return 0; |
1758 | } | |
1759 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1760 | ||
1761 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1762 | { | |
1763 | struct flowi fl; | |
1764 | ||
3e3850e9 | 1765 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 LT |
1766 | return 0; |
1767 | ||
1768 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1769 | } | |
1770 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1771 | ||
d49c73c7 DM |
1772 | /* Optimize later using cookies and generation ids. */ |
1773 | ||
1da177e4 LT |
1774 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1775 | { | |
d49c73c7 DM |
1776 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
1777 | * to "-1" to force all XFRM destinations to get validated by | |
1778 | * dst_ops->check on every use. We do this because when a | |
1779 | * normal route referenced by an XFRM dst is obsoleted we do | |
1780 | * not go looking around for all parent referencing XFRM dsts | |
1781 | * so that we can invalidate them. It is just too much work. | |
1782 | * Instead we make the checks here on every use. For example: | |
1783 | * | |
1784 | * XFRM dst A --> IPv4 dst X | |
1785 | * | |
1786 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
1787 | * in this example). If X is marked obsolete, "A" will not | |
1788 | * notice. That's what we are validating here via the | |
1789 | * stale_bundle() check. | |
1790 | * | |
1791 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
1792 | * dst which causes it's ->obsolete field to be set to a | |
1793 | * positive non-zero integer. If an XFRM dst has been pruned | |
1794 | * like this, we want to force a new route lookup. | |
399c180a | 1795 | */ |
d49c73c7 DM |
1796 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
1797 | return dst; | |
1798 | ||
1da177e4 LT |
1799 | return NULL; |
1800 | } | |
1801 | ||
1802 | static int stale_bundle(struct dst_entry *dst) | |
1803 | { | |
5b368e61 | 1804 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
1805 | } |
1806 | ||
aabc9761 | 1807 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 1808 | { |
1da177e4 LT |
1809 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
1810 | dst->dev = &loopback_dev; | |
1811 | dev_hold(&loopback_dev); | |
1812 | dev_put(dev); | |
1813 | } | |
1814 | } | |
aabc9761 | 1815 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
1816 | |
1817 | static void xfrm_link_failure(struct sk_buff *skb) | |
1818 | { | |
1819 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1820 | return; | |
1821 | } | |
1822 | ||
1823 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
1824 | { | |
1825 | if (dst) { | |
1826 | if (dst->obsolete) { | |
1827 | dst_release(dst); | |
1828 | dst = NULL; | |
1829 | } | |
1830 | } | |
1831 | return dst; | |
1832 | } | |
1833 | ||
2518c7c2 DM |
1834 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
1835 | { | |
1836 | struct dst_entry *dst, **dstp; | |
1837 | ||
1838 | write_lock(&pol->lock); | |
1839 | dstp = &pol->bundles; | |
1840 | while ((dst=*dstp) != NULL) { | |
1841 | if (func(dst)) { | |
1842 | *dstp = dst->next; | |
1843 | dst->next = *gc_list_p; | |
1844 | *gc_list_p = dst; | |
1845 | } else { | |
1846 | dstp = &dst->next; | |
1847 | } | |
1848 | } | |
1849 | write_unlock(&pol->lock); | |
1850 | } | |
1851 | ||
1da177e4 LT |
1852 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
1853 | { | |
2518c7c2 DM |
1854 | struct dst_entry *gc_list = NULL; |
1855 | int dir; | |
1da177e4 LT |
1856 | |
1857 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
1858 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
1859 | struct xfrm_policy *pol; | |
1860 | struct hlist_node *entry; | |
1861 | struct hlist_head *table; | |
1862 | int i; | |
4e81bb83 | 1863 | |
2518c7c2 DM |
1864 | hlist_for_each_entry(pol, entry, |
1865 | &xfrm_policy_inexact[dir], bydst) | |
1866 | prune_one_bundle(pol, func, &gc_list); | |
1867 | ||
1868 | table = xfrm_policy_bydst[dir].table; | |
1869 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
1870 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
1871 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
1872 | } |
1873 | } | |
1874 | read_unlock_bh(&xfrm_policy_lock); | |
1875 | ||
1876 | while (gc_list) { | |
2518c7c2 | 1877 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
1878 | gc_list = dst->next; |
1879 | dst_free(dst); | |
1880 | } | |
1881 | } | |
1882 | ||
1883 | static int unused_bundle(struct dst_entry *dst) | |
1884 | { | |
1885 | return !atomic_read(&dst->__refcnt); | |
1886 | } | |
1887 | ||
1888 | static void __xfrm_garbage_collect(void) | |
1889 | { | |
1890 | xfrm_prune_bundles(unused_bundle); | |
1891 | } | |
1892 | ||
1c095399 | 1893 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
1894 | { |
1895 | xfrm_prune_bundles(stale_bundle); | |
1896 | return 0; | |
1897 | } | |
1898 | ||
1899 | void xfrm_init_pmtu(struct dst_entry *dst) | |
1900 | { | |
1901 | do { | |
1902 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1903 | u32 pmtu, route_mtu_cached; | |
1904 | ||
1905 | pmtu = dst_mtu(dst->child); | |
1906 | xdst->child_mtu_cached = pmtu; | |
1907 | ||
1908 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
1909 | ||
1910 | route_mtu_cached = dst_mtu(xdst->route); | |
1911 | xdst->route_mtu_cached = route_mtu_cached; | |
1912 | ||
1913 | if (pmtu > route_mtu_cached) | |
1914 | pmtu = route_mtu_cached; | |
1915 | ||
1916 | dst->metrics[RTAX_MTU-1] = pmtu; | |
1917 | } while ((dst = dst->next)); | |
1918 | } | |
1919 | ||
1920 | EXPORT_SYMBOL(xfrm_init_pmtu); | |
1921 | ||
1922 | /* Check that the bundle accepts the flow and its components are | |
1923 | * still valid. | |
1924 | */ | |
1925 | ||
5b368e61 VY |
1926 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
1927 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
1928 | { |
1929 | struct dst_entry *dst = &first->u.dst; | |
1930 | struct xfrm_dst *last; | |
1931 | u32 mtu; | |
1932 | ||
92d63dec | 1933 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
1934 | (dst->dev && !netif_running(dst->dev))) |
1935 | return 0; | |
1936 | ||
1937 | last = NULL; | |
1938 | ||
1939 | do { | |
1940 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1941 | ||
1942 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
1943 | return 0; | |
67f83cbf VY |
1944 | if (fl && pol && |
1945 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 1946 | return 0; |
1da177e4 LT |
1947 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
1948 | return 0; | |
9d4a706d DM |
1949 | if (xdst->genid != dst->xfrm->genid) |
1950 | return 0; | |
e53820de MN |
1951 | |
1952 | if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL && | |
1953 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) | |
1954 | return 0; | |
1da177e4 LT |
1955 | |
1956 | mtu = dst_mtu(dst->child); | |
1957 | if (xdst->child_mtu_cached != mtu) { | |
1958 | last = xdst; | |
1959 | xdst->child_mtu_cached = mtu; | |
1960 | } | |
1961 | ||
92d63dec | 1962 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
1963 | return 0; |
1964 | mtu = dst_mtu(xdst->route); | |
1965 | if (xdst->route_mtu_cached != mtu) { | |
1966 | last = xdst; | |
1967 | xdst->route_mtu_cached = mtu; | |
1968 | } | |
1969 | ||
1970 | dst = dst->child; | |
1971 | } while (dst->xfrm); | |
1972 | ||
1973 | if (likely(!last)) | |
1974 | return 1; | |
1975 | ||
1976 | mtu = last->child_mtu_cached; | |
1977 | for (;;) { | |
1978 | dst = &last->u.dst; | |
1979 | ||
1980 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
1981 | if (mtu > last->route_mtu_cached) | |
1982 | mtu = last->route_mtu_cached; | |
1983 | dst->metrics[RTAX_MTU-1] = mtu; | |
1984 | ||
1985 | if (last == first) | |
1986 | break; | |
1987 | ||
1988 | last = last->u.next; | |
1989 | last->child_mtu_cached = mtu; | |
1990 | } | |
1991 | ||
1992 | return 1; | |
1993 | } | |
1994 | ||
1995 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
1996 | ||
c9204d9c | 1997 | #ifdef CONFIG_AUDITSYSCALL |
161a09e7 JL |
1998 | /* Audit addition and deletion of SAs and ipsec policy */ |
1999 | ||
2000 | void xfrm_audit_log(uid_t auid, u32 sid, int type, int result, | |
2001 | struct xfrm_policy *xp, struct xfrm_state *x) | |
2002 | { | |
2003 | ||
2004 | char *secctx; | |
2005 | u32 secctx_len; | |
2006 | struct xfrm_sec_ctx *sctx = NULL; | |
2007 | struct audit_buffer *audit_buf; | |
2008 | int family; | |
2009 | extern int audit_enabled; | |
2010 | ||
2011 | if (audit_enabled == 0) | |
2012 | return; | |
2013 | ||
13fcfbb0 DM |
2014 | BUG_ON((type == AUDIT_MAC_IPSEC_ADDSA || |
2015 | type == AUDIT_MAC_IPSEC_DELSA) && !x); | |
2016 | BUG_ON((type == AUDIT_MAC_IPSEC_ADDSPD || | |
2017 | type == AUDIT_MAC_IPSEC_DELSPD) && !xp); | |
2018 | ||
161a09e7 JL |
2019 | audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type); |
2020 | if (audit_buf == NULL) | |
13fcfbb0 | 2021 | return; |
161a09e7 JL |
2022 | |
2023 | switch(type) { | |
2024 | case AUDIT_MAC_IPSEC_ADDSA: | |
2025 | audit_log_format(audit_buf, "SAD add: auid=%u", auid); | |
2026 | break; | |
2027 | case AUDIT_MAC_IPSEC_DELSA: | |
2028 | audit_log_format(audit_buf, "SAD delete: auid=%u", auid); | |
2029 | break; | |
2030 | case AUDIT_MAC_IPSEC_ADDSPD: | |
2031 | audit_log_format(audit_buf, "SPD add: auid=%u", auid); | |
2032 | break; | |
2033 | case AUDIT_MAC_IPSEC_DELSPD: | |
2034 | audit_log_format(audit_buf, "SPD delete: auid=%u", auid); | |
2035 | break; | |
2036 | default: | |
2037 | return; | |
2038 | } | |
2039 | ||
2040 | if (sid != 0 && | |
2041 | security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) | |
2042 | audit_log_format(audit_buf, " subj=%s", secctx); | |
2043 | else | |
2044 | audit_log_task_context(audit_buf); | |
2045 | ||
2046 | if (xp) { | |
2047 | family = xp->selector.family; | |
2048 | if (xp->security) | |
2049 | sctx = xp->security; | |
2050 | } else { | |
2051 | family = x->props.family; | |
2052 | if (x->security) | |
2053 | sctx = x->security; | |
2054 | } | |
2055 | ||
2056 | if (sctx) | |
2057 | audit_log_format(audit_buf, | |
2058 | " sec_alg=%u sec_doi=%u sec_obj=%s", | |
2059 | sctx->ctx_alg, sctx->ctx_doi, sctx->ctx_str); | |
2060 | ||
2061 | switch(family) { | |
2062 | case AF_INET: | |
2063 | { | |
2064 | struct in_addr saddr, daddr; | |
2065 | if (xp) { | |
2066 | saddr.s_addr = xp->selector.saddr.a4; | |
2067 | daddr.s_addr = xp->selector.daddr.a4; | |
2068 | } else { | |
2069 | saddr.s_addr = x->props.saddr.a4; | |
2070 | daddr.s_addr = x->id.daddr.a4; | |
2071 | } | |
2072 | audit_log_format(audit_buf, | |
2073 | " src=%u.%u.%u.%u dst=%u.%u.%u.%u", | |
2074 | NIPQUAD(saddr), NIPQUAD(daddr)); | |
2075 | } | |
2076 | break; | |
2077 | case AF_INET6: | |
2078 | { | |
2079 | struct in6_addr saddr6, daddr6; | |
2080 | if (xp) { | |
2081 | memcpy(&saddr6, xp->selector.saddr.a6, | |
2082 | sizeof(struct in6_addr)); | |
2083 | memcpy(&daddr6, xp->selector.daddr.a6, | |
2084 | sizeof(struct in6_addr)); | |
2085 | } else { | |
2086 | memcpy(&saddr6, x->props.saddr.a6, | |
2087 | sizeof(struct in6_addr)); | |
2088 | memcpy(&daddr6, x->id.daddr.a6, | |
2089 | sizeof(struct in6_addr)); | |
2090 | } | |
2091 | audit_log_format(audit_buf, | |
96199558 | 2092 | " src=" NIP6_FMT " dst=" NIP6_FMT, |
161a09e7 JL |
2093 | NIP6(saddr6), NIP6(daddr6)); |
2094 | } | |
2095 | break; | |
2096 | } | |
2097 | ||
2098 | if (x) | |
2099 | audit_log_format(audit_buf, " spi=%lu(0x%lx) protocol=%s", | |
2100 | (unsigned long)ntohl(x->id.spi), | |
2101 | (unsigned long)ntohl(x->id.spi), | |
2102 | x->id.proto == IPPROTO_AH ? "AH" : | |
2103 | (x->id.proto == IPPROTO_ESP ? | |
2104 | "ESP" : "IPCOMP")); | |
2105 | ||
2106 | audit_log_format(audit_buf, " res=%u", result); | |
2107 | audit_log_end(audit_buf); | |
2108 | } | |
2109 | ||
2110 | EXPORT_SYMBOL(xfrm_audit_log); | |
c9204d9c | 2111 | #endif /* CONFIG_AUDITSYSCALL */ |
161a09e7 | 2112 | |
1da177e4 LT |
2113 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2114 | { | |
2115 | int err = 0; | |
2116 | if (unlikely(afinfo == NULL)) | |
2117 | return -EINVAL; | |
2118 | if (unlikely(afinfo->family >= NPROTO)) | |
2119 | return -EAFNOSUPPORT; | |
e959d812 | 2120 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2121 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2122 | err = -ENOBUFS; | |
2123 | else { | |
2124 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2125 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2126 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2127 | if (likely(dst_ops->check == NULL)) | |
2128 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2129 | if (likely(dst_ops->negative_advice == NULL)) |
2130 | dst_ops->negative_advice = xfrm_negative_advice; | |
2131 | if (likely(dst_ops->link_failure == NULL)) | |
2132 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2133 | if (likely(afinfo->garbage_collect == NULL)) |
2134 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2135 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2136 | } | |
e959d812 | 2137 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2138 | return err; |
2139 | } | |
2140 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2141 | ||
2142 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2143 | { | |
2144 | int err = 0; | |
2145 | if (unlikely(afinfo == NULL)) | |
2146 | return -EINVAL; | |
2147 | if (unlikely(afinfo->family >= NPROTO)) | |
2148 | return -EAFNOSUPPORT; | |
e959d812 | 2149 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2150 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2151 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2152 | err = -EINVAL; | |
2153 | else { | |
2154 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2155 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2156 | dst_ops->kmem_cachep = NULL; | |
2157 | dst_ops->check = NULL; | |
1da177e4 LT |
2158 | dst_ops->negative_advice = NULL; |
2159 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2160 | afinfo->garbage_collect = NULL; |
2161 | } | |
2162 | } | |
e959d812 | 2163 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2164 | return err; |
2165 | } | |
2166 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2167 | ||
2168 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2169 | { | |
2170 | struct xfrm_policy_afinfo *afinfo; | |
2171 | if (unlikely(family >= NPROTO)) | |
2172 | return NULL; | |
2173 | read_lock(&xfrm_policy_afinfo_lock); | |
2174 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2175 | if (unlikely(!afinfo)) |
2176 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2177 | return afinfo; |
2178 | } | |
2179 | ||
2180 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2181 | { | |
546be240 HX |
2182 | read_unlock(&xfrm_policy_afinfo_lock); |
2183 | } | |
2184 | ||
2185 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family) | |
2186 | { | |
2187 | struct xfrm_policy_afinfo *afinfo; | |
2188 | if (unlikely(family >= NPROTO)) | |
2189 | return NULL; | |
2190 | write_lock_bh(&xfrm_policy_afinfo_lock); | |
2191 | afinfo = xfrm_policy_afinfo[family]; | |
2192 | if (unlikely(!afinfo)) | |
2193 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
2194 | return afinfo; | |
2195 | } | |
2196 | ||
2197 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2198 | { | |
2199 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2200 | } |
2201 | ||
2202 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
2203 | { | |
2204 | switch (event) { | |
2205 | case NETDEV_DOWN: | |
2206 | xfrm_flush_bundles(); | |
2207 | } | |
2208 | return NOTIFY_DONE; | |
2209 | } | |
2210 | ||
2211 | static struct notifier_block xfrm_dev_notifier = { | |
2212 | xfrm_dev_event, | |
2213 | NULL, | |
2214 | 0 | |
2215 | }; | |
2216 | ||
2217 | static void __init xfrm_policy_init(void) | |
2218 | { | |
2518c7c2 DM |
2219 | unsigned int hmask, sz; |
2220 | int dir; | |
2221 | ||
1da177e4 LT |
2222 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2223 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2224 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
1da177e4 | 2225 | NULL, NULL); |
1da177e4 | 2226 | |
2518c7c2 DM |
2227 | hmask = 8 - 1; |
2228 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2229 | ||
44e36b42 | 2230 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2231 | xfrm_idx_hmask = hmask; |
2232 | if (!xfrm_policy_byidx) | |
2233 | panic("XFRM: failed to allocate byidx hash\n"); | |
2234 | ||
2235 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2236 | struct xfrm_policy_hash *htab; | |
2237 | ||
2238 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2239 | ||
2240 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2241 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2242 | htab->hmask = hmask; |
2243 | if (!htab->table) | |
2244 | panic("XFRM: failed to allocate bydst hash\n"); | |
2245 | } | |
2246 | ||
c4028958 | 2247 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2248 | register_netdevice_notifier(&xfrm_dev_notifier); |
2249 | } | |
2250 | ||
2251 | void __init xfrm_init(void) | |
2252 | { | |
2253 | xfrm_state_init(); | |
2254 | xfrm_policy_init(); | |
2255 | xfrm_input_init(); | |
2256 | } | |
2257 | ||
80c9abaa SS |
2258 | #ifdef CONFIG_XFRM_MIGRATE |
2259 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2260 | struct xfrm_selector *sel_tgt) | |
2261 | { | |
2262 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2263 | if (sel_tgt->family == sel_cmp->family && | |
2264 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2265 | sel_cmp->family) == 0 && |
80c9abaa SS |
2266 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2267 | sel_cmp->family) == 0 && | |
2268 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2269 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2270 | return 1; | |
2271 | } | |
2272 | } else { | |
2273 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2274 | return 1; | |
2275 | } | |
2276 | } | |
2277 | return 0; | |
2278 | } | |
2279 | ||
2280 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2281 | u8 dir, u8 type) | |
2282 | { | |
2283 | struct xfrm_policy *pol, *ret = NULL; | |
2284 | struct hlist_node *entry; | |
2285 | struct hlist_head *chain; | |
2286 | u32 priority = ~0U; | |
2287 | ||
2288 | read_lock_bh(&xfrm_policy_lock); | |
2289 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2290 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2291 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2292 | pol->type == type) { | |
2293 | ret = pol; | |
2294 | priority = ret->priority; | |
2295 | break; | |
2296 | } | |
2297 | } | |
2298 | chain = &xfrm_policy_inexact[dir]; | |
2299 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2300 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2301 | pol->type == type && | |
2302 | pol->priority < priority) { | |
2303 | ret = pol; | |
2304 | break; | |
2305 | } | |
2306 | } | |
2307 | ||
2308 | if (ret) | |
2309 | xfrm_pol_hold(ret); | |
2310 | ||
2311 | read_unlock_bh(&xfrm_policy_lock); | |
2312 | ||
2313 | return ret; | |
2314 | } | |
2315 | ||
2316 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2317 | { | |
2318 | int match = 0; | |
2319 | ||
2320 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2321 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2322 | switch (t->mode) { | |
2323 | case XFRM_MODE_TUNNEL: | |
2324 | case XFRM_MODE_BEET: | |
2325 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2326 | m->old_family) == 0 && | |
2327 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2328 | m->old_family) == 0) { | |
2329 | match = 1; | |
2330 | } | |
2331 | break; | |
2332 | case XFRM_MODE_TRANSPORT: | |
2333 | /* in case of transport mode, template does not store | |
2334 | any IP addresses, hence we just compare mode and | |
2335 | protocol */ | |
2336 | match = 1; | |
2337 | break; | |
2338 | default: | |
2339 | break; | |
2340 | } | |
2341 | } | |
2342 | return match; | |
2343 | } | |
2344 | ||
2345 | /* update endpoint address(es) of template(s) */ | |
2346 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2347 | struct xfrm_migrate *m, int num_migrate) | |
2348 | { | |
2349 | struct xfrm_migrate *mp; | |
2350 | struct dst_entry *dst; | |
2351 | int i, j, n = 0; | |
2352 | ||
2353 | write_lock_bh(&pol->lock); | |
2354 | if (unlikely(pol->dead)) { | |
2355 | /* target policy has been deleted */ | |
2356 | write_unlock_bh(&pol->lock); | |
2357 | return -ENOENT; | |
2358 | } | |
2359 | ||
2360 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2361 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2362 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2363 | continue; | |
2364 | n++; | |
2365 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL) | |
2366 | continue; | |
2367 | /* update endpoints */ | |
2368 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2369 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2370 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2371 | sizeof(pol->xfrm_vec[i].saddr)); | |
2372 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2373 | /* flush bundles */ | |
2374 | while ((dst = pol->bundles) != NULL) { | |
2375 | pol->bundles = dst->next; | |
2376 | dst_free(dst); | |
2377 | } | |
2378 | } | |
2379 | } | |
2380 | ||
2381 | write_unlock_bh(&pol->lock); | |
2382 | ||
2383 | if (!n) | |
2384 | return -ENODATA; | |
2385 | ||
2386 | return 0; | |
2387 | } | |
2388 | ||
2389 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2390 | { | |
2391 | int i, j; | |
2392 | ||
2393 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2394 | return -EINVAL; | |
2395 | ||
2396 | for (i = 0; i < num_migrate; i++) { | |
2397 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2398 | m[i].old_family) == 0) && | |
2399 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2400 | m[i].old_family) == 0)) | |
2401 | return -EINVAL; | |
2402 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2403 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2404 | return -EINVAL; | |
2405 | ||
2406 | /* check if there is any duplicated entry */ | |
2407 | for (j = i + 1; j < num_migrate; j++) { | |
2408 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2409 | sizeof(m[i].old_daddr)) && | |
2410 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2411 | sizeof(m[i].old_saddr)) && | |
2412 | m[i].proto == m[j].proto && | |
2413 | m[i].mode == m[j].mode && | |
2414 | m[i].reqid == m[j].reqid && | |
2415 | m[i].old_family == m[j].old_family) | |
2416 | return -EINVAL; | |
2417 | } | |
2418 | } | |
2419 | ||
2420 | return 0; | |
2421 | } | |
2422 | ||
2423 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
2424 | struct xfrm_migrate *m, int num_migrate) | |
2425 | { | |
2426 | int i, err, nx_cur = 0, nx_new = 0; | |
2427 | struct xfrm_policy *pol = NULL; | |
2428 | struct xfrm_state *x, *xc; | |
2429 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2430 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2431 | struct xfrm_migrate *mp; | |
2432 | ||
2433 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2434 | goto out; | |
2435 | ||
2436 | /* Stage 1 - find policy */ | |
2437 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2438 | err = -ENOENT; | |
2439 | goto out; | |
2440 | } | |
2441 | ||
2442 | /* Stage 2 - find and update state(s) */ | |
2443 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2444 | if ((x = xfrm_migrate_state_find(mp))) { | |
2445 | x_cur[nx_cur] = x; | |
2446 | nx_cur++; | |
2447 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2448 | x_new[nx_new] = xc; | |
2449 | nx_new++; | |
2450 | } else { | |
2451 | err = -ENODATA; | |
2452 | goto restore_state; | |
2453 | } | |
2454 | } | |
2455 | } | |
2456 | ||
2457 | /* Stage 3 - update policy */ | |
2458 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2459 | goto restore_state; | |
2460 | ||
2461 | /* Stage 4 - delete old state(s) */ | |
2462 | if (nx_cur) { | |
2463 | xfrm_states_put(x_cur, nx_cur); | |
2464 | xfrm_states_delete(x_cur, nx_cur); | |
2465 | } | |
2466 | ||
2467 | /* Stage 5 - announce */ | |
2468 | km_migrate(sel, dir, type, m, num_migrate); | |
2469 | ||
2470 | xfrm_pol_put(pol); | |
2471 | ||
2472 | return 0; | |
2473 | out: | |
2474 | return err; | |
2475 | ||
2476 | restore_state: | |
2477 | if (pol) | |
2478 | xfrm_pol_put(pol); | |
2479 | if (nx_cur) | |
2480 | xfrm_states_put(x_cur, nx_cur); | |
2481 | if (nx_new) | |
2482 | xfrm_states_delete(x_new, nx_new); | |
2483 | ||
2484 | return err; | |
2485 | } | |
e610e679 | 2486 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa SS |
2487 | #endif |
2488 |