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 | ||
ecfd6b18 JHS |
582 | void xfrm_spd_getinfo(struct xfrm_spdinfo *si) |
583 | { | |
584 | read_lock_bh(&xfrm_policy_lock); | |
585 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
586 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
587 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
588 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
589 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
590 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
591 | si->spdhcnt = xfrm_idx_hmask; | |
592 | si->spdhmcnt = xfrm_policy_hashmax; | |
593 | read_unlock_bh(&xfrm_policy_lock); | |
594 | } | |
595 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 596 | |
ecfd6b18 | 597 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 598 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
599 | { |
600 | int dir, total; | |
601 | ||
602 | mutex_lock(&hash_resize_mutex); | |
603 | ||
604 | total = 0; | |
605 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
606 | if (xfrm_bydst_should_resize(dir, &total)) | |
607 | xfrm_bydst_resize(dir); | |
608 | } | |
609 | if (xfrm_byidx_should_resize(total)) | |
610 | xfrm_byidx_resize(total); | |
611 | ||
612 | mutex_unlock(&hash_resize_mutex); | |
613 | } | |
614 | ||
c4028958 | 615 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 616 | |
1da177e4 LT |
617 | /* Generate new index... KAME seems to generate them ordered by cost |
618 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
4e81bb83 | 619 | static u32 xfrm_gen_index(u8 type, int dir) |
1da177e4 | 620 | { |
1da177e4 LT |
621 | static u32 idx_generator; |
622 | ||
623 | for (;;) { | |
2518c7c2 DM |
624 | struct hlist_node *entry; |
625 | struct hlist_head *list; | |
626 | struct xfrm_policy *p; | |
627 | u32 idx; | |
628 | int found; | |
629 | ||
1da177e4 LT |
630 | idx = (idx_generator | dir); |
631 | idx_generator += 8; | |
632 | if (idx == 0) | |
633 | idx = 8; | |
2518c7c2 DM |
634 | list = xfrm_policy_byidx + idx_hash(idx); |
635 | found = 0; | |
636 | hlist_for_each_entry(p, entry, list, byidx) { | |
637 | if (p->index == idx) { | |
638 | found = 1; | |
1da177e4 | 639 | break; |
2518c7c2 | 640 | } |
1da177e4 | 641 | } |
2518c7c2 | 642 | if (!found) |
1da177e4 LT |
643 | return idx; |
644 | } | |
645 | } | |
646 | ||
2518c7c2 DM |
647 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
648 | { | |
649 | u32 *p1 = (u32 *) s1; | |
650 | u32 *p2 = (u32 *) s2; | |
651 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
652 | int i; | |
653 | ||
654 | for (i = 0; i < len; i++) { | |
655 | if (p1[i] != p2[i]) | |
656 | return 1; | |
657 | } | |
658 | ||
659 | return 0; | |
660 | } | |
661 | ||
1da177e4 LT |
662 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
663 | { | |
2518c7c2 DM |
664 | struct xfrm_policy *pol; |
665 | struct xfrm_policy *delpol; | |
666 | struct hlist_head *chain; | |
a6c7ab55 | 667 | struct hlist_node *entry, *newpos; |
9b78a82c | 668 | struct dst_entry *gc_list; |
1da177e4 LT |
669 | |
670 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
671 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
672 | delpol = NULL; | |
673 | newpos = NULL; | |
2518c7c2 | 674 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 675 | if (pol->type == policy->type && |
2518c7c2 | 676 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
677 | xfrm_sec_ctx_match(pol->security, policy->security) && |
678 | !WARN_ON(delpol)) { | |
1da177e4 LT |
679 | if (excl) { |
680 | write_unlock_bh(&xfrm_policy_lock); | |
681 | return -EEXIST; | |
682 | } | |
1da177e4 LT |
683 | delpol = pol; |
684 | if (policy->priority > pol->priority) | |
685 | continue; | |
686 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 687 | newpos = &pol->bydst; |
1da177e4 LT |
688 | continue; |
689 | } | |
1da177e4 LT |
690 | if (delpol) |
691 | break; | |
1da177e4 LT |
692 | } |
693 | if (newpos) | |
2518c7c2 DM |
694 | hlist_add_after(newpos, &policy->bydst); |
695 | else | |
696 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 697 | xfrm_pol_hold(policy); |
2518c7c2 | 698 | xfrm_policy_count[dir]++; |
1da177e4 | 699 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
700 | if (delpol) { |
701 | hlist_del(&delpol->bydst); | |
702 | hlist_del(&delpol->byidx); | |
703 | xfrm_policy_count[dir]--; | |
704 | } | |
4e81bb83 | 705 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 706 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 707 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
708 | policy->curlft.use_time = 0; |
709 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
710 | xfrm_pol_hold(policy); | |
711 | write_unlock_bh(&xfrm_policy_lock); | |
712 | ||
9b78a82c | 713 | if (delpol) |
1da177e4 | 714 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
715 | else if (xfrm_bydst_should_resize(dir, NULL)) |
716 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
717 | |
718 | read_lock_bh(&xfrm_policy_lock); | |
719 | gc_list = NULL; | |
2518c7c2 DM |
720 | entry = &policy->bydst; |
721 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
722 | struct dst_entry *dst; |
723 | ||
724 | write_lock(&policy->lock); | |
725 | dst = policy->bundles; | |
726 | if (dst) { | |
727 | struct dst_entry *tail = dst; | |
728 | while (tail->next) | |
729 | tail = tail->next; | |
730 | tail->next = gc_list; | |
731 | gc_list = dst; | |
732 | ||
733 | policy->bundles = NULL; | |
734 | } | |
735 | write_unlock(&policy->lock); | |
1da177e4 | 736 | } |
9b78a82c DM |
737 | read_unlock_bh(&xfrm_policy_lock); |
738 | ||
739 | while (gc_list) { | |
740 | struct dst_entry *dst = gc_list; | |
741 | ||
742 | gc_list = dst->next; | |
743 | dst_free(dst); | |
744 | } | |
745 | ||
1da177e4 LT |
746 | return 0; |
747 | } | |
748 | EXPORT_SYMBOL(xfrm_policy_insert); | |
749 | ||
4e81bb83 MN |
750 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
751 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
752 | struct xfrm_sec_ctx *ctx, int delete, |
753 | int *err) | |
1da177e4 | 754 | { |
2518c7c2 DM |
755 | struct xfrm_policy *pol, *ret; |
756 | struct hlist_head *chain; | |
757 | struct hlist_node *entry; | |
1da177e4 | 758 | |
ef41aaa0 | 759 | *err = 0; |
1da177e4 | 760 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
761 | chain = policy_hash_bysel(sel, sel->family, dir); |
762 | ret = NULL; | |
763 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
764 | if (pol->type == type && | |
765 | !selector_cmp(sel, &pol->selector) && | |
766 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 767 | xfrm_pol_hold(pol); |
2518c7c2 | 768 | if (delete) { |
ef41aaa0 EP |
769 | *err = security_xfrm_policy_delete(pol); |
770 | if (*err) { | |
771 | write_unlock_bh(&xfrm_policy_lock); | |
772 | return pol; | |
773 | } | |
2518c7c2 DM |
774 | hlist_del(&pol->bydst); |
775 | hlist_del(&pol->byidx); | |
776 | xfrm_policy_count[dir]--; | |
777 | } | |
778 | ret = pol; | |
1da177e4 LT |
779 | break; |
780 | } | |
781 | } | |
782 | write_unlock_bh(&xfrm_policy_lock); | |
783 | ||
2518c7c2 | 784 | if (ret && delete) { |
1da177e4 | 785 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 786 | xfrm_policy_kill(ret); |
1da177e4 | 787 | } |
2518c7c2 | 788 | return ret; |
1da177e4 | 789 | } |
df71837d | 790 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 791 | |
ef41aaa0 EP |
792 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
793 | int *err) | |
1da177e4 | 794 | { |
2518c7c2 DM |
795 | struct xfrm_policy *pol, *ret; |
796 | struct hlist_head *chain; | |
797 | struct hlist_node *entry; | |
1da177e4 | 798 | |
ef41aaa0 | 799 | *err = 0; |
1da177e4 | 800 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
801 | chain = xfrm_policy_byidx + idx_hash(id); |
802 | ret = NULL; | |
803 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
804 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 805 | xfrm_pol_hold(pol); |
2518c7c2 | 806 | if (delete) { |
ef41aaa0 EP |
807 | *err = security_xfrm_policy_delete(pol); |
808 | if (*err) { | |
809 | write_unlock_bh(&xfrm_policy_lock); | |
810 | return pol; | |
811 | } | |
2518c7c2 DM |
812 | hlist_del(&pol->bydst); |
813 | hlist_del(&pol->byidx); | |
814 | xfrm_policy_count[dir]--; | |
815 | } | |
816 | ret = pol; | |
1da177e4 LT |
817 | break; |
818 | } | |
819 | } | |
820 | write_unlock_bh(&xfrm_policy_lock); | |
821 | ||
2518c7c2 | 822 | if (ret && delete) { |
1da177e4 | 823 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 824 | xfrm_policy_kill(ret); |
1da177e4 | 825 | } |
2518c7c2 | 826 | return ret; |
1da177e4 LT |
827 | } |
828 | EXPORT_SYMBOL(xfrm_policy_byid); | |
829 | ||
161a09e7 | 830 | void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 831 | { |
1da177e4 LT |
832 | int dir; |
833 | ||
834 | write_lock_bh(&xfrm_policy_lock); | |
835 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
836 | struct xfrm_policy *pol; |
837 | struct hlist_node *entry; | |
ae8c0577 | 838 | int i, killed; |
2518c7c2 | 839 | |
ae8c0577 | 840 | killed = 0; |
2518c7c2 DM |
841 | again1: |
842 | hlist_for_each_entry(pol, entry, | |
843 | &xfrm_policy_inexact[dir], bydst) { | |
844 | if (pol->type != type) | |
845 | continue; | |
846 | hlist_del(&pol->bydst); | |
847 | hlist_del(&pol->byidx); | |
1da177e4 LT |
848 | write_unlock_bh(&xfrm_policy_lock); |
849 | ||
161a09e7 JL |
850 | xfrm_audit_log(audit_info->loginuid, audit_info->secid, |
851 | AUDIT_MAC_IPSEC_DELSPD, 1, pol, NULL); | |
852 | ||
2518c7c2 | 853 | xfrm_policy_kill(pol); |
ae8c0577 | 854 | killed++; |
1da177e4 LT |
855 | |
856 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
857 | goto again1; |
858 | } | |
859 | ||
860 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
861 | again2: | |
862 | hlist_for_each_entry(pol, entry, | |
863 | xfrm_policy_bydst[dir].table + i, | |
864 | bydst) { | |
865 | if (pol->type != type) | |
866 | continue; | |
867 | hlist_del(&pol->bydst); | |
868 | hlist_del(&pol->byidx); | |
869 | write_unlock_bh(&xfrm_policy_lock); | |
870 | ||
161a09e7 JL |
871 | xfrm_audit_log(audit_info->loginuid, |
872 | audit_info->secid, | |
873 | AUDIT_MAC_IPSEC_DELSPD, 1, | |
874 | pol, NULL); | |
875 | ||
2518c7c2 | 876 | xfrm_policy_kill(pol); |
ae8c0577 | 877 | killed++; |
2518c7c2 DM |
878 | |
879 | write_lock_bh(&xfrm_policy_lock); | |
880 | goto again2; | |
881 | } | |
1da177e4 | 882 | } |
2518c7c2 | 883 | |
ae8c0577 | 884 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
885 | } |
886 | atomic_inc(&flow_cache_genid); | |
887 | write_unlock_bh(&xfrm_policy_lock); | |
888 | } | |
889 | EXPORT_SYMBOL(xfrm_policy_flush); | |
890 | ||
4e81bb83 | 891 | int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
892 | void *data) |
893 | { | |
baf5d743 | 894 | struct xfrm_policy *pol, *last = NULL; |
2518c7c2 | 895 | struct hlist_node *entry; |
baf5d743 | 896 | int dir, last_dir = 0, count, error; |
1da177e4 LT |
897 | |
898 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 | 899 | count = 0; |
1da177e4 LT |
900 | |
901 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
902 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
903 | int i; | |
904 | ||
905 | hlist_for_each_entry(pol, entry, | |
906 | &xfrm_policy_inexact[dir], 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++; | |
1da177e4 | 918 | } |
2518c7c2 DM |
919 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
920 | hlist_for_each_entry(pol, entry, table + i, bydst) { | |
921 | if (pol->type != type) | |
922 | continue; | |
baf5d743 JHS |
923 | if (last) { |
924 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
925 | count, data); | |
926 | if (error) | |
927 | goto out; | |
928 | } | |
929 | last = pol; | |
930 | last_dir = dir; | |
931 | count++; | |
2518c7c2 DM |
932 | } |
933 | } | |
1da177e4 | 934 | } |
baf5d743 JHS |
935 | if (count == 0) { |
936 | error = -ENOENT; | |
937 | goto out; | |
938 | } | |
939 | error = func(last, last_dir % XFRM_POLICY_MAX, 0, data); | |
1da177e4 LT |
940 | out: |
941 | read_unlock_bh(&xfrm_policy_lock); | |
942 | return error; | |
943 | } | |
944 | EXPORT_SYMBOL(xfrm_policy_walk); | |
945 | ||
134b0fc5 JM |
946 | /* |
947 | * Find policy to apply to this flow. | |
948 | * | |
949 | * Returns 0 if policy found, else an -errno. | |
950 | */ | |
2518c7c2 DM |
951 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
952 | u8 type, u16 family, int dir) | |
1da177e4 | 953 | { |
2518c7c2 | 954 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 955 | int match, ret = -ESRCH; |
1da177e4 | 956 | |
2518c7c2 DM |
957 | if (pol->family != family || |
958 | pol->type != type) | |
134b0fc5 | 959 | return ret; |
1da177e4 | 960 | |
2518c7c2 | 961 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 JM |
962 | if (match) |
963 | ret = security_xfrm_policy_lookup(pol, fl->secid, dir); | |
2518c7c2 | 964 | |
134b0fc5 | 965 | return ret; |
2518c7c2 | 966 | } |
1da177e4 | 967 | |
2518c7c2 DM |
968 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
969 | u16 family, u8 dir) | |
970 | { | |
134b0fc5 | 971 | int err; |
2518c7c2 DM |
972 | struct xfrm_policy *pol, *ret; |
973 | xfrm_address_t *daddr, *saddr; | |
974 | struct hlist_node *entry; | |
975 | struct hlist_head *chain; | |
acba48e1 | 976 | u32 priority = ~0U; |
df71837d | 977 | |
2518c7c2 DM |
978 | daddr = xfrm_flowi_daddr(fl, family); |
979 | saddr = xfrm_flowi_saddr(fl, family); | |
980 | if (unlikely(!daddr || !saddr)) | |
981 | return NULL; | |
982 | ||
983 | read_lock_bh(&xfrm_policy_lock); | |
984 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
985 | ret = NULL; | |
986 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
987 | err = xfrm_policy_match(pol, fl, type, family, dir); |
988 | if (err) { | |
989 | if (err == -ESRCH) | |
990 | continue; | |
991 | else { | |
992 | ret = ERR_PTR(err); | |
993 | goto fail; | |
994 | } | |
995 | } else { | |
2518c7c2 | 996 | ret = pol; |
acba48e1 | 997 | priority = ret->priority; |
2518c7c2 DM |
998 | break; |
999 | } | |
1000 | } | |
acba48e1 DM |
1001 | chain = &xfrm_policy_inexact[dir]; |
1002 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
1003 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1004 | if (err) { | |
1005 | if (err == -ESRCH) | |
1006 | continue; | |
1007 | else { | |
1008 | ret = ERR_PTR(err); | |
1009 | goto fail; | |
1010 | } | |
1011 | } else if (pol->priority < priority) { | |
acba48e1 DM |
1012 | ret = pol; |
1013 | break; | |
1da177e4 LT |
1014 | } |
1015 | } | |
acba48e1 DM |
1016 | if (ret) |
1017 | xfrm_pol_hold(ret); | |
134b0fc5 | 1018 | fail: |
1da177e4 | 1019 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 1020 | |
2518c7c2 | 1021 | return ret; |
4e81bb83 MN |
1022 | } |
1023 | ||
134b0fc5 | 1024 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
1025 | void **objp, atomic_t **obj_refp) |
1026 | { | |
1027 | struct xfrm_policy *pol; | |
134b0fc5 | 1028 | int err = 0; |
4e81bb83 MN |
1029 | |
1030 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1031 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
1032 | if (IS_ERR(pol)) { |
1033 | err = PTR_ERR(pol); | |
1034 | pol = NULL; | |
1035 | } | |
1036 | if (pol || err) | |
4e81bb83 MN |
1037 | goto end; |
1038 | #endif | |
1039 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
1040 | if (IS_ERR(pol)) { |
1041 | err = PTR_ERR(pol); | |
1042 | pol = NULL; | |
1043 | } | |
4e81bb83 | 1044 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1045 | end: |
4e81bb83 | 1046 | #endif |
1da177e4 LT |
1047 | if ((*objp = (void *) pol) != NULL) |
1048 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1049 | return err; |
1da177e4 LT |
1050 | } |
1051 | ||
df71837d TJ |
1052 | static inline int policy_to_flow_dir(int dir) |
1053 | { | |
1054 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1055 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1056 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1057 | return dir; | |
1058 | switch (dir) { | |
1059 | default: | |
1060 | case XFRM_POLICY_IN: | |
1061 | return FLOW_DIR_IN; | |
1062 | case XFRM_POLICY_OUT: | |
1063 | return FLOW_DIR_OUT; | |
1064 | case XFRM_POLICY_FWD: | |
1065 | return FLOW_DIR_FWD; | |
3ff50b79 | 1066 | } |
df71837d TJ |
1067 | } |
1068 | ||
e0d1caa7 | 1069 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1070 | { |
1071 | struct xfrm_policy *pol; | |
1072 | ||
1073 | read_lock_bh(&xfrm_policy_lock); | |
1074 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1075 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1076 | sk->sk_family); |
a716c119 | 1077 | int err = 0; |
df71837d | 1078 | |
3bccfbc7 VY |
1079 | if (match) { |
1080 | err = security_xfrm_policy_lookup(pol, fl->secid, | |
1081 | policy_to_flow_dir(dir)); | |
1082 | if (!err) | |
1083 | xfrm_pol_hold(pol); | |
1084 | else if (err == -ESRCH) | |
1085 | pol = NULL; | |
1086 | else | |
1087 | pol = ERR_PTR(err); | |
1088 | } else | |
1da177e4 LT |
1089 | pol = NULL; |
1090 | } | |
1091 | read_unlock_bh(&xfrm_policy_lock); | |
1092 | return pol; | |
1093 | } | |
1094 | ||
1095 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1096 | { | |
2518c7c2 DM |
1097 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1098 | pol->family, dir); | |
4e81bb83 | 1099 | |
2518c7c2 DM |
1100 | hlist_add_head(&pol->bydst, chain); |
1101 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1102 | xfrm_policy_count[dir]++; | |
1da177e4 | 1103 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1104 | |
1105 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1106 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1107 | } |
1108 | ||
1109 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1110 | int dir) | |
1111 | { | |
2518c7c2 DM |
1112 | if (hlist_unhashed(&pol->bydst)) |
1113 | return NULL; | |
1da177e4 | 1114 | |
2518c7c2 DM |
1115 | hlist_del(&pol->bydst); |
1116 | hlist_del(&pol->byidx); | |
1117 | xfrm_policy_count[dir]--; | |
1118 | ||
1119 | return pol; | |
1da177e4 LT |
1120 | } |
1121 | ||
4666faab | 1122 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1123 | { |
1124 | write_lock_bh(&xfrm_policy_lock); | |
1125 | pol = __xfrm_policy_unlink(pol, dir); | |
1126 | write_unlock_bh(&xfrm_policy_lock); | |
1127 | if (pol) { | |
1128 | if (dir < XFRM_POLICY_MAX) | |
1129 | atomic_inc(&flow_cache_genid); | |
1130 | xfrm_policy_kill(pol); | |
4666faab | 1131 | return 0; |
1da177e4 | 1132 | } |
4666faab | 1133 | return -ENOENT; |
1da177e4 | 1134 | } |
a70fcb0b | 1135 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1136 | |
1137 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1138 | { | |
1139 | struct xfrm_policy *old_pol; | |
1140 | ||
4e81bb83 MN |
1141 | #ifdef CONFIG_XFRM_SUB_POLICY |
1142 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1143 | return -EINVAL; | |
1144 | #endif | |
1145 | ||
1da177e4 LT |
1146 | write_lock_bh(&xfrm_policy_lock); |
1147 | old_pol = sk->sk_policy[dir]; | |
1148 | sk->sk_policy[dir] = pol; | |
1149 | if (pol) { | |
9d729f72 | 1150 | pol->curlft.add_time = get_seconds(); |
4e81bb83 | 1151 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1152 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1153 | } | |
1154 | if (old_pol) | |
1155 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1156 | write_unlock_bh(&xfrm_policy_lock); | |
1157 | ||
1158 | if (old_pol) { | |
1159 | xfrm_policy_kill(old_pol); | |
1160 | } | |
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1165 | { | |
1166 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1167 | ||
1168 | if (newp) { | |
1169 | newp->selector = old->selector; | |
df71837d TJ |
1170 | if (security_xfrm_policy_clone(old, newp)) { |
1171 | kfree(newp); | |
1172 | return NULL; /* ENOMEM */ | |
1173 | } | |
1da177e4 LT |
1174 | newp->lft = old->lft; |
1175 | newp->curlft = old->curlft; | |
1176 | newp->action = old->action; | |
1177 | newp->flags = old->flags; | |
1178 | newp->xfrm_nr = old->xfrm_nr; | |
1179 | newp->index = old->index; | |
4e81bb83 | 1180 | newp->type = old->type; |
1da177e4 LT |
1181 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1182 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1183 | write_lock_bh(&xfrm_policy_lock); | |
1184 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1185 | write_unlock_bh(&xfrm_policy_lock); | |
1186 | xfrm_pol_put(newp); | |
1187 | } | |
1188 | return newp; | |
1189 | } | |
1190 | ||
1191 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1192 | { | |
1193 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1194 | *p1 = sk->sk_policy[1]; | |
1195 | ||
1196 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1197 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1198 | return -ENOMEM; | |
1199 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1200 | return -ENOMEM; | |
1201 | return 0; | |
1202 | } | |
1203 | ||
a1e59abf PM |
1204 | static int |
1205 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1206 | unsigned short family) | |
1207 | { | |
1208 | int err; | |
1209 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1210 | ||
1211 | if (unlikely(afinfo == NULL)) | |
1212 | return -EINVAL; | |
1213 | err = afinfo->get_saddr(local, remote); | |
1214 | xfrm_policy_put_afinfo(afinfo); | |
1215 | return err; | |
1216 | } | |
1217 | ||
1da177e4 LT |
1218 | /* Resolve list of templates for the flow, given policy. */ |
1219 | ||
1220 | static int | |
4e81bb83 MN |
1221 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1222 | struct xfrm_state **xfrm, | |
1223 | unsigned short family) | |
1da177e4 LT |
1224 | { |
1225 | int nx; | |
1226 | int i, error; | |
1227 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1228 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1229 | xfrm_address_t tmp; |
1da177e4 LT |
1230 | |
1231 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1232 | struct xfrm_state *x; | |
1233 | xfrm_address_t *remote = daddr; | |
1234 | xfrm_address_t *local = saddr; | |
1235 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1236 | ||
7e49e6de | 1237 | if (tmpl->mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
1238 | remote = &tmpl->id.daddr; |
1239 | local = &tmpl->saddr; | |
76b3f055 | 1240 | family = tmpl->encap_family; |
a1e59abf PM |
1241 | if (xfrm_addr_any(local, family)) { |
1242 | error = xfrm_get_saddr(&tmp, remote, family); | |
1243 | if (error) | |
1244 | goto fail; | |
1245 | local = &tmp; | |
1246 | } | |
1da177e4 LT |
1247 | } |
1248 | ||
1249 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1250 | ||
1251 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1252 | xfrm[nx++] = x; | |
1253 | daddr = remote; | |
1254 | saddr = local; | |
1255 | continue; | |
1256 | } | |
1257 | if (x) { | |
1258 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1259 | -EINVAL : -EAGAIN); | |
1260 | xfrm_state_put(x); | |
1261 | } | |
1262 | ||
1263 | if (!tmpl->optional) | |
1264 | goto fail; | |
1265 | } | |
1266 | return nx; | |
1267 | ||
1268 | fail: | |
1269 | for (nx--; nx>=0; nx--) | |
1270 | xfrm_state_put(xfrm[nx]); | |
1271 | return error; | |
1272 | } | |
1273 | ||
4e81bb83 MN |
1274 | static int |
1275 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1276 | struct xfrm_state **xfrm, | |
1277 | unsigned short family) | |
1278 | { | |
41a49cc3 MN |
1279 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1280 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1281 | int cnx = 0; |
1282 | int error; | |
1283 | int ret; | |
1284 | int i; | |
1285 | ||
1286 | for (i = 0; i < npols; i++) { | |
1287 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1288 | error = -ENOBUFS; | |
1289 | goto fail; | |
1290 | } | |
41a49cc3 MN |
1291 | |
1292 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1293 | if (ret < 0) { |
1294 | error = ret; | |
1295 | goto fail; | |
1296 | } else | |
1297 | cnx += ret; | |
1298 | } | |
1299 | ||
41a49cc3 MN |
1300 | /* found states are sorted for outbound processing */ |
1301 | if (npols > 1) | |
1302 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1303 | ||
4e81bb83 MN |
1304 | return cnx; |
1305 | ||
1306 | fail: | |
1307 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1308 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1309 | return error; |
1310 | ||
1311 | } | |
1312 | ||
1da177e4 LT |
1313 | /* Check that the bundle accepts the flow and its components are |
1314 | * still valid. | |
1315 | */ | |
1316 | ||
1317 | static struct dst_entry * | |
1318 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1319 | { | |
1320 | struct dst_entry *x; | |
1321 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1322 | if (unlikely(afinfo == NULL)) | |
1323 | return ERR_PTR(-EINVAL); | |
1324 | x = afinfo->find_bundle(fl, policy); | |
1325 | xfrm_policy_put_afinfo(afinfo); | |
1326 | return x; | |
1327 | } | |
1328 | ||
1329 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate | |
1330 | * all the metrics... Shortly, bundle a bundle. | |
1331 | */ | |
1332 | ||
1333 | static int | |
1334 | xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, | |
1335 | struct flowi *fl, struct dst_entry **dst_p, | |
1336 | unsigned short family) | |
1337 | { | |
1338 | int err; | |
1339 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1340 | if (unlikely(afinfo == NULL)) | |
1341 | return -EINVAL; | |
1342 | err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p); | |
1343 | xfrm_policy_put_afinfo(afinfo); | |
1344 | return err; | |
1345 | } | |
1346 | ||
1da177e4 LT |
1347 | |
1348 | static int stale_bundle(struct dst_entry *dst); | |
1349 | ||
1350 | /* Main function: finds/creates a bundle for given flow. | |
1351 | * | |
1352 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1353 | * on interfaces with disabled IPsec. | |
1354 | */ | |
1355 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1356 | struct sock *sk, int flags) | |
1357 | { | |
1358 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1359 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1360 | int npols; | |
1361 | int pol_dead; | |
1362 | int xfrm_nr; | |
1363 | int pi; | |
1da177e4 LT |
1364 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1365 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1366 | int nx = 0; | |
1367 | int err; | |
1368 | u32 genid; | |
42cf93cd | 1369 | u16 family; |
df71837d | 1370 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1371 | |
1da177e4 LT |
1372 | restart: |
1373 | genid = atomic_read(&flow_cache_genid); | |
1374 | policy = NULL; | |
4e81bb83 MN |
1375 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1376 | pols[pi] = NULL; | |
1377 | npols = 0; | |
1378 | pol_dead = 0; | |
1379 | xfrm_nr = 0; | |
1380 | ||
3bccfbc7 | 1381 | if (sk && sk->sk_policy[1]) { |
e0d1caa7 | 1382 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
3bccfbc7 VY |
1383 | if (IS_ERR(policy)) |
1384 | return PTR_ERR(policy); | |
1385 | } | |
1da177e4 LT |
1386 | |
1387 | if (!policy) { | |
1388 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1389 | if ((dst_orig->flags & DST_NOXFRM) || |
1390 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
1da177e4 LT |
1391 | return 0; |
1392 | ||
e0d1caa7 | 1393 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1394 | dir, xfrm_policy_lookup); |
134b0fc5 JM |
1395 | if (IS_ERR(policy)) |
1396 | return PTR_ERR(policy); | |
1da177e4 LT |
1397 | } |
1398 | ||
1399 | if (!policy) | |
1400 | return 0; | |
1401 | ||
42cf93cd | 1402 | family = dst_orig->ops->family; |
9d729f72 | 1403 | policy->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1404 | pols[0] = policy; |
1405 | npols ++; | |
1406 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 LT |
1407 | |
1408 | switch (policy->action) { | |
1409 | case XFRM_POLICY_BLOCK: | |
1410 | /* Prohibit the flow */ | |
e104411b PM |
1411 | err = -EPERM; |
1412 | goto error; | |
1da177e4 LT |
1413 | |
1414 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1415 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1416 | if (policy->xfrm_nr == 0) { |
1417 | /* Flow passes not transformed. */ | |
1418 | xfrm_pol_put(policy); | |
1419 | return 0; | |
1420 | } | |
4e81bb83 | 1421 | #endif |
1da177e4 LT |
1422 | |
1423 | /* Try to find matching bundle. | |
1424 | * | |
1425 | * LATER: help from flow cache. It is optional, this | |
1426 | * is required only for output policy. | |
1427 | */ | |
1428 | dst = xfrm_find_bundle(fl, policy, family); | |
1429 | if (IS_ERR(dst)) { | |
e104411b PM |
1430 | err = PTR_ERR(dst); |
1431 | goto error; | |
1da177e4 LT |
1432 | } |
1433 | ||
1434 | if (dst) | |
1435 | break; | |
1436 | ||
4e81bb83 MN |
1437 | #ifdef CONFIG_XFRM_SUB_POLICY |
1438 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1439 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1440 | fl, family, | |
1441 | XFRM_POLICY_OUT); | |
1442 | if (pols[1]) { | |
134b0fc5 JM |
1443 | if (IS_ERR(pols[1])) { |
1444 | err = PTR_ERR(pols[1]); | |
1445 | goto error; | |
1446 | } | |
4e81bb83 MN |
1447 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
1448 | err = -EPERM; | |
1449 | goto error; | |
1450 | } | |
1451 | npols ++; | |
1452 | xfrm_nr += pols[1]->xfrm_nr; | |
1453 | } | |
1454 | } | |
1455 | ||
1456 | /* | |
1457 | * Because neither flowi nor bundle information knows about | |
1458 | * transformation template size. On more than one policy usage | |
1459 | * we can realize whether all of them is bypass or not after | |
1460 | * they are searched. See above not-transformed bypass | |
1461 | * is surrounded by non-sub policy configuration, too. | |
1462 | */ | |
1463 | if (xfrm_nr == 0) { | |
1464 | /* Flow passes not transformed. */ | |
1465 | xfrm_pols_put(pols, npols); | |
1466 | return 0; | |
1467 | } | |
1468 | ||
1469 | #endif | |
1470 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1471 | |
1472 | if (unlikely(nx<0)) { | |
1473 | err = nx; | |
1474 | if (err == -EAGAIN && flags) { | |
1475 | DECLARE_WAITQUEUE(wait, current); | |
1476 | ||
1477 | add_wait_queue(&km_waitq, &wait); | |
1478 | set_current_state(TASK_INTERRUPTIBLE); | |
1479 | schedule(); | |
1480 | set_current_state(TASK_RUNNING); | |
1481 | remove_wait_queue(&km_waitq, &wait); | |
1482 | ||
4e81bb83 | 1483 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1484 | |
1485 | if (nx == -EAGAIN && signal_pending(current)) { | |
1486 | err = -ERESTART; | |
1487 | goto error; | |
1488 | } | |
1489 | if (nx == -EAGAIN || | |
1490 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1491 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1492 | goto restart; |
1493 | } | |
1494 | err = nx; | |
1495 | } | |
1496 | if (err < 0) | |
1497 | goto error; | |
1498 | } | |
1499 | if (nx == 0) { | |
1500 | /* Flow passes not transformed. */ | |
4e81bb83 | 1501 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1502 | return 0; |
1503 | } | |
1504 | ||
1505 | dst = dst_orig; | |
1506 | err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family); | |
1507 | ||
1508 | if (unlikely(err)) { | |
1509 | int i; | |
1510 | for (i=0; i<nx; i++) | |
1511 | xfrm_state_put(xfrm[i]); | |
1512 | goto error; | |
1513 | } | |
1514 | ||
4e81bb83 MN |
1515 | for (pi = 0; pi < npols; pi++) { |
1516 | read_lock_bh(&pols[pi]->lock); | |
1517 | pol_dead |= pols[pi]->dead; | |
1518 | read_unlock_bh(&pols[pi]->lock); | |
1519 | } | |
1520 | ||
1da177e4 | 1521 | write_lock_bh(&policy->lock); |
4e81bb83 | 1522 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1523 | /* Wow! While we worked on resolving, this |
1524 | * policy has gone. Retry. It is not paranoia, | |
1525 | * we just cannot enlist new bundle to dead object. | |
1526 | * We can't enlist stable bundles either. | |
1527 | */ | |
1528 | write_unlock_bh(&policy->lock); | |
1da177e4 LT |
1529 | if (dst) |
1530 | dst_free(dst); | |
00de651d HX |
1531 | |
1532 | err = -EHOSTUNREACH; | |
1533 | goto error; | |
1da177e4 LT |
1534 | } |
1535 | dst->next = policy->bundles; | |
1536 | policy->bundles = dst; | |
1537 | dst_hold(dst); | |
1538 | write_unlock_bh(&policy->lock); | |
1539 | } | |
1540 | *dst_p = dst; | |
1541 | dst_release(dst_orig); | |
a716c119 | 1542 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1543 | return 0; |
1544 | ||
1545 | error: | |
1546 | dst_release(dst_orig); | |
4e81bb83 | 1547 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1548 | *dst_p = NULL; |
1549 | return err; | |
1550 | } | |
1551 | EXPORT_SYMBOL(xfrm_lookup); | |
1552 | ||
df0ba92a MN |
1553 | static inline int |
1554 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1555 | { | |
1556 | struct xfrm_state *x; | |
1557 | int err; | |
1558 | ||
1559 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1560 | return 0; | |
1561 | x = skb->sp->xvec[idx]; | |
1562 | if (!x->type->reject) | |
1563 | return 0; | |
1564 | xfrm_state_hold(x); | |
1565 | err = x->type->reject(x, skb, fl); | |
1566 | xfrm_state_put(x); | |
1567 | return err; | |
1568 | } | |
1569 | ||
1da177e4 LT |
1570 | /* When skb is transformed back to its "native" form, we have to |
1571 | * check policy restrictions. At the moment we make this in maximally | |
1572 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1573 | * have policy cached at them. | |
1574 | */ | |
1575 | ||
1576 | static inline int | |
a716c119 | 1577 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1578 | unsigned short family) |
1579 | { | |
1580 | if (xfrm_state_kern(x)) | |
928ba416 | 1581 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1582 | return x->id.proto == tmpl->id.proto && |
1583 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1584 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1585 | x->props.mode == tmpl->mode && | |
f3bd4840 MN |
1586 | ((tmpl->aalgos & (1<<x->props.aalgo)) || |
1587 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && | |
7e49e6de MN |
1588 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1589 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1590 | } |
1591 | ||
df0ba92a MN |
1592 | /* |
1593 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1594 | * because of optional transport mode, or next index of the mathced secpath | |
1595 | * state with the template. | |
1596 | * -1 is returned when no matching template is found. | |
1597 | * Otherwise "-2 - errored_index" is returned. | |
1598 | */ | |
1da177e4 LT |
1599 | static inline int |
1600 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1601 | unsigned short family) | |
1602 | { | |
1603 | int idx = start; | |
1604 | ||
1605 | if (tmpl->optional) { | |
7e49e6de | 1606 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1607 | return start; |
1608 | } else | |
1609 | start = -1; | |
1610 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1611 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1612 | return ++idx; |
df0ba92a MN |
1613 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1614 | if (start == -1) | |
1615 | start = -2-idx; | |
1da177e4 | 1616 | break; |
df0ba92a | 1617 | } |
1da177e4 LT |
1618 | } |
1619 | return start; | |
1620 | } | |
1621 | ||
3e3850e9 PM |
1622 | int |
1623 | xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family) | |
1da177e4 LT |
1624 | { |
1625 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1626 | int err; |
1da177e4 LT |
1627 | |
1628 | if (unlikely(afinfo == NULL)) | |
1629 | return -EAFNOSUPPORT; | |
1630 | ||
1631 | afinfo->decode_session(skb, fl); | |
beb8d13b | 1632 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1633 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1634 | return err; |
1da177e4 | 1635 | } |
3e3850e9 | 1636 | EXPORT_SYMBOL(xfrm_decode_session); |
1da177e4 | 1637 | |
df0ba92a | 1638 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1639 | { |
1640 | for (; k < sp->len; k++) { | |
df0ba92a | 1641 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1642 | *idxp = k; |
1da177e4 | 1643 | return 1; |
df0ba92a | 1644 | } |
1da177e4 LT |
1645 | } |
1646 | ||
1647 | return 0; | |
1648 | } | |
1649 | ||
a716c119 | 1650 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1651 | unsigned short family) |
1652 | { | |
1653 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1654 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1655 | int npols = 0; | |
1656 | int xfrm_nr; | |
1657 | int pi; | |
1da177e4 | 1658 | struct flowi fl; |
df71837d | 1659 | u8 fl_dir = policy_to_flow_dir(dir); |
df0ba92a | 1660 | int xerr_idx = -1; |
1da177e4 | 1661 | |
3e3850e9 | 1662 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 | 1663 | return 0; |
eb9c7ebe | 1664 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1665 | |
1666 | /* First, check used SA against their selectors. */ | |
1667 | if (skb->sp) { | |
1668 | int i; | |
1669 | ||
1670 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa HX |
1671 | struct xfrm_state *x = skb->sp->xvec[i]; |
1672 | if (!xfrm_selector_match(&x->sel, &fl, family)) | |
1da177e4 | 1673 | return 0; |
1da177e4 LT |
1674 | } |
1675 | } | |
1676 | ||
1677 | pol = NULL; | |
3bccfbc7 | 1678 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1679 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
3bccfbc7 VY |
1680 | if (IS_ERR(pol)) |
1681 | return 0; | |
1682 | } | |
1da177e4 LT |
1683 | |
1684 | if (!pol) | |
e0d1caa7 | 1685 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1686 | xfrm_policy_lookup); |
1687 | ||
134b0fc5 JM |
1688 | if (IS_ERR(pol)) |
1689 | return 0; | |
1690 | ||
df0ba92a | 1691 | if (!pol) { |
d1d9facf | 1692 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a MN |
1693 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
1694 | return 0; | |
1695 | } | |
1696 | return 1; | |
1697 | } | |
1da177e4 | 1698 | |
9d729f72 | 1699 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1700 | |
4e81bb83 MN |
1701 | pols[0] = pol; |
1702 | npols ++; | |
1703 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1704 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1705 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1706 | &fl, family, | |
1707 | XFRM_POLICY_IN); | |
1708 | if (pols[1]) { | |
134b0fc5 JM |
1709 | if (IS_ERR(pols[1])) |
1710 | return 0; | |
9d729f72 | 1711 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1712 | npols ++; |
1713 | } | |
1714 | } | |
1715 | #endif | |
1716 | ||
1da177e4 LT |
1717 | if (pol->action == XFRM_POLICY_ALLOW) { |
1718 | struct sec_path *sp; | |
1719 | static struct sec_path dummy; | |
4e81bb83 | 1720 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1721 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1722 | struct xfrm_tmpl **tpp = tp; |
1723 | int ti = 0; | |
1da177e4 LT |
1724 | int i, k; |
1725 | ||
1726 | if ((sp = skb->sp) == NULL) | |
1727 | sp = &dummy; | |
1728 | ||
4e81bb83 MN |
1729 | for (pi = 0; pi < npols; pi++) { |
1730 | if (pols[pi] != pol && | |
1731 | pols[pi]->action != XFRM_POLICY_ALLOW) | |
1732 | goto reject; | |
1733 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) | |
1734 | goto reject_error; | |
1735 | for (i = 0; i < pols[pi]->xfrm_nr; i++) | |
1736 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1737 | } | |
1738 | xfrm_nr = ti; | |
41a49cc3 MN |
1739 | if (npols > 1) { |
1740 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
1741 | tpp = stp; | |
1742 | } | |
4e81bb83 | 1743 | |
1da177e4 LT |
1744 | /* For each tunnel xfrm, find the first matching tmpl. |
1745 | * For each tmpl before that, find corresponding xfrm. | |
1746 | * Order is _important_. Later we will implement | |
1747 | * some barriers, but at the moment barriers | |
1748 | * are implied between each two transformations. | |
1749 | */ | |
4e81bb83 MN |
1750 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
1751 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 1752 | if (k < 0) { |
d1d9facf JM |
1753 | if (k < -1) |
1754 | /* "-2 - errored_index" returned */ | |
1755 | xerr_idx = -(2+k); | |
1da177e4 | 1756 | goto reject; |
df0ba92a | 1757 | } |
1da177e4 LT |
1758 | } |
1759 | ||
d1d9facf | 1760 | if (secpath_has_nontransport(sp, k, &xerr_idx)) |
1da177e4 LT |
1761 | goto reject; |
1762 | ||
4e81bb83 | 1763 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1764 | return 1; |
1765 | } | |
1766 | ||
1767 | reject: | |
df0ba92a | 1768 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
1769 | reject_error: |
1770 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
1771 | return 0; |
1772 | } | |
1773 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1774 | ||
1775 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1776 | { | |
1777 | struct flowi fl; | |
1778 | ||
3e3850e9 | 1779 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 LT |
1780 | return 0; |
1781 | ||
1782 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1783 | } | |
1784 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1785 | ||
d49c73c7 DM |
1786 | /* Optimize later using cookies and generation ids. */ |
1787 | ||
1da177e4 LT |
1788 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1789 | { | |
d49c73c7 DM |
1790 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
1791 | * to "-1" to force all XFRM destinations to get validated by | |
1792 | * dst_ops->check on every use. We do this because when a | |
1793 | * normal route referenced by an XFRM dst is obsoleted we do | |
1794 | * not go looking around for all parent referencing XFRM dsts | |
1795 | * so that we can invalidate them. It is just too much work. | |
1796 | * Instead we make the checks here on every use. For example: | |
1797 | * | |
1798 | * XFRM dst A --> IPv4 dst X | |
1799 | * | |
1800 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
1801 | * in this example). If X is marked obsolete, "A" will not | |
1802 | * notice. That's what we are validating here via the | |
1803 | * stale_bundle() check. | |
1804 | * | |
1805 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
1806 | * dst which causes it's ->obsolete field to be set to a | |
1807 | * positive non-zero integer. If an XFRM dst has been pruned | |
1808 | * like this, we want to force a new route lookup. | |
399c180a | 1809 | */ |
d49c73c7 DM |
1810 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
1811 | return dst; | |
1812 | ||
1da177e4 LT |
1813 | return NULL; |
1814 | } | |
1815 | ||
1816 | static int stale_bundle(struct dst_entry *dst) | |
1817 | { | |
5b368e61 | 1818 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
1819 | } |
1820 | ||
aabc9761 | 1821 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 1822 | { |
1da177e4 LT |
1823 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
1824 | dst->dev = &loopback_dev; | |
1825 | dev_hold(&loopback_dev); | |
1826 | dev_put(dev); | |
1827 | } | |
1828 | } | |
aabc9761 | 1829 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
1830 | |
1831 | static void xfrm_link_failure(struct sk_buff *skb) | |
1832 | { | |
1833 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1834 | return; | |
1835 | } | |
1836 | ||
1837 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
1838 | { | |
1839 | if (dst) { | |
1840 | if (dst->obsolete) { | |
1841 | dst_release(dst); | |
1842 | dst = NULL; | |
1843 | } | |
1844 | } | |
1845 | return dst; | |
1846 | } | |
1847 | ||
2518c7c2 DM |
1848 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
1849 | { | |
1850 | struct dst_entry *dst, **dstp; | |
1851 | ||
1852 | write_lock(&pol->lock); | |
1853 | dstp = &pol->bundles; | |
1854 | while ((dst=*dstp) != NULL) { | |
1855 | if (func(dst)) { | |
1856 | *dstp = dst->next; | |
1857 | dst->next = *gc_list_p; | |
1858 | *gc_list_p = dst; | |
1859 | } else { | |
1860 | dstp = &dst->next; | |
1861 | } | |
1862 | } | |
1863 | write_unlock(&pol->lock); | |
1864 | } | |
1865 | ||
1da177e4 LT |
1866 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
1867 | { | |
2518c7c2 DM |
1868 | struct dst_entry *gc_list = NULL; |
1869 | int dir; | |
1da177e4 LT |
1870 | |
1871 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
1872 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
1873 | struct xfrm_policy *pol; | |
1874 | struct hlist_node *entry; | |
1875 | struct hlist_head *table; | |
1876 | int i; | |
4e81bb83 | 1877 | |
2518c7c2 DM |
1878 | hlist_for_each_entry(pol, entry, |
1879 | &xfrm_policy_inexact[dir], bydst) | |
1880 | prune_one_bundle(pol, func, &gc_list); | |
1881 | ||
1882 | table = xfrm_policy_bydst[dir].table; | |
1883 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
1884 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
1885 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
1886 | } |
1887 | } | |
1888 | read_unlock_bh(&xfrm_policy_lock); | |
1889 | ||
1890 | while (gc_list) { | |
2518c7c2 | 1891 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
1892 | gc_list = dst->next; |
1893 | dst_free(dst); | |
1894 | } | |
1895 | } | |
1896 | ||
1897 | static int unused_bundle(struct dst_entry *dst) | |
1898 | { | |
1899 | return !atomic_read(&dst->__refcnt); | |
1900 | } | |
1901 | ||
1902 | static void __xfrm_garbage_collect(void) | |
1903 | { | |
1904 | xfrm_prune_bundles(unused_bundle); | |
1905 | } | |
1906 | ||
1c095399 | 1907 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
1908 | { |
1909 | xfrm_prune_bundles(stale_bundle); | |
1910 | return 0; | |
1911 | } | |
1912 | ||
1913 | void xfrm_init_pmtu(struct dst_entry *dst) | |
1914 | { | |
1915 | do { | |
1916 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1917 | u32 pmtu, route_mtu_cached; | |
1918 | ||
1919 | pmtu = dst_mtu(dst->child); | |
1920 | xdst->child_mtu_cached = pmtu; | |
1921 | ||
1922 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
1923 | ||
1924 | route_mtu_cached = dst_mtu(xdst->route); | |
1925 | xdst->route_mtu_cached = route_mtu_cached; | |
1926 | ||
1927 | if (pmtu > route_mtu_cached) | |
1928 | pmtu = route_mtu_cached; | |
1929 | ||
1930 | dst->metrics[RTAX_MTU-1] = pmtu; | |
1931 | } while ((dst = dst->next)); | |
1932 | } | |
1933 | ||
1934 | EXPORT_SYMBOL(xfrm_init_pmtu); | |
1935 | ||
1936 | /* Check that the bundle accepts the flow and its components are | |
1937 | * still valid. | |
1938 | */ | |
1939 | ||
5b368e61 VY |
1940 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
1941 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
1942 | { |
1943 | struct dst_entry *dst = &first->u.dst; | |
1944 | struct xfrm_dst *last; | |
1945 | u32 mtu; | |
1946 | ||
92d63dec | 1947 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
1948 | (dst->dev && !netif_running(dst->dev))) |
1949 | return 0; | |
1950 | ||
1951 | last = NULL; | |
1952 | ||
1953 | do { | |
1954 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1955 | ||
1956 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
1957 | return 0; | |
67f83cbf VY |
1958 | if (fl && pol && |
1959 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 1960 | return 0; |
1da177e4 LT |
1961 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
1962 | return 0; | |
9d4a706d DM |
1963 | if (xdst->genid != dst->xfrm->genid) |
1964 | return 0; | |
e53820de MN |
1965 | |
1966 | if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL && | |
1967 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) | |
1968 | return 0; | |
1da177e4 LT |
1969 | |
1970 | mtu = dst_mtu(dst->child); | |
1971 | if (xdst->child_mtu_cached != mtu) { | |
1972 | last = xdst; | |
1973 | xdst->child_mtu_cached = mtu; | |
1974 | } | |
1975 | ||
92d63dec | 1976 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
1977 | return 0; |
1978 | mtu = dst_mtu(xdst->route); | |
1979 | if (xdst->route_mtu_cached != mtu) { | |
1980 | last = xdst; | |
1981 | xdst->route_mtu_cached = mtu; | |
1982 | } | |
1983 | ||
1984 | dst = dst->child; | |
1985 | } while (dst->xfrm); | |
1986 | ||
1987 | if (likely(!last)) | |
1988 | return 1; | |
1989 | ||
1990 | mtu = last->child_mtu_cached; | |
1991 | for (;;) { | |
1992 | dst = &last->u.dst; | |
1993 | ||
1994 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
1995 | if (mtu > last->route_mtu_cached) | |
1996 | mtu = last->route_mtu_cached; | |
1997 | dst->metrics[RTAX_MTU-1] = mtu; | |
1998 | ||
1999 | if (last == first) | |
2000 | break; | |
2001 | ||
2002 | last = last->u.next; | |
2003 | last->child_mtu_cached = mtu; | |
2004 | } | |
2005 | ||
2006 | return 1; | |
2007 | } | |
2008 | ||
2009 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2010 | ||
c9204d9c | 2011 | #ifdef CONFIG_AUDITSYSCALL |
161a09e7 JL |
2012 | /* Audit addition and deletion of SAs and ipsec policy */ |
2013 | ||
2014 | void xfrm_audit_log(uid_t auid, u32 sid, int type, int result, | |
2015 | struct xfrm_policy *xp, struct xfrm_state *x) | |
2016 | { | |
2017 | ||
2018 | char *secctx; | |
2019 | u32 secctx_len; | |
2020 | struct xfrm_sec_ctx *sctx = NULL; | |
2021 | struct audit_buffer *audit_buf; | |
2022 | int family; | |
2023 | extern int audit_enabled; | |
2024 | ||
2025 | if (audit_enabled == 0) | |
2026 | return; | |
2027 | ||
13fcfbb0 DM |
2028 | BUG_ON((type == AUDIT_MAC_IPSEC_ADDSA || |
2029 | type == AUDIT_MAC_IPSEC_DELSA) && !x); | |
2030 | BUG_ON((type == AUDIT_MAC_IPSEC_ADDSPD || | |
2031 | type == AUDIT_MAC_IPSEC_DELSPD) && !xp); | |
2032 | ||
161a09e7 JL |
2033 | audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type); |
2034 | if (audit_buf == NULL) | |
13fcfbb0 | 2035 | return; |
161a09e7 JL |
2036 | |
2037 | switch(type) { | |
2038 | case AUDIT_MAC_IPSEC_ADDSA: | |
2039 | audit_log_format(audit_buf, "SAD add: auid=%u", auid); | |
2040 | break; | |
2041 | case AUDIT_MAC_IPSEC_DELSA: | |
2042 | audit_log_format(audit_buf, "SAD delete: auid=%u", auid); | |
2043 | break; | |
2044 | case AUDIT_MAC_IPSEC_ADDSPD: | |
2045 | audit_log_format(audit_buf, "SPD add: auid=%u", auid); | |
2046 | break; | |
2047 | case AUDIT_MAC_IPSEC_DELSPD: | |
2048 | audit_log_format(audit_buf, "SPD delete: auid=%u", auid); | |
2049 | break; | |
2050 | default: | |
2051 | return; | |
2052 | } | |
2053 | ||
2054 | if (sid != 0 && | |
2055 | security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) | |
2056 | audit_log_format(audit_buf, " subj=%s", secctx); | |
2057 | else | |
2058 | audit_log_task_context(audit_buf); | |
2059 | ||
2060 | if (xp) { | |
2061 | family = xp->selector.family; | |
2062 | if (xp->security) | |
2063 | sctx = xp->security; | |
2064 | } else { | |
2065 | family = x->props.family; | |
2066 | if (x->security) | |
2067 | sctx = x->security; | |
2068 | } | |
2069 | ||
2070 | if (sctx) | |
2071 | audit_log_format(audit_buf, | |
2072 | " sec_alg=%u sec_doi=%u sec_obj=%s", | |
2073 | sctx->ctx_alg, sctx->ctx_doi, sctx->ctx_str); | |
2074 | ||
2075 | switch(family) { | |
2076 | case AF_INET: | |
2077 | { | |
2078 | struct in_addr saddr, daddr; | |
2079 | if (xp) { | |
2080 | saddr.s_addr = xp->selector.saddr.a4; | |
2081 | daddr.s_addr = xp->selector.daddr.a4; | |
2082 | } else { | |
2083 | saddr.s_addr = x->props.saddr.a4; | |
2084 | daddr.s_addr = x->id.daddr.a4; | |
2085 | } | |
2086 | audit_log_format(audit_buf, | |
2087 | " src=%u.%u.%u.%u dst=%u.%u.%u.%u", | |
2088 | NIPQUAD(saddr), NIPQUAD(daddr)); | |
2089 | } | |
2090 | break; | |
2091 | case AF_INET6: | |
2092 | { | |
2093 | struct in6_addr saddr6, daddr6; | |
2094 | if (xp) { | |
2095 | memcpy(&saddr6, xp->selector.saddr.a6, | |
2096 | sizeof(struct in6_addr)); | |
2097 | memcpy(&daddr6, xp->selector.daddr.a6, | |
2098 | sizeof(struct in6_addr)); | |
2099 | } else { | |
2100 | memcpy(&saddr6, x->props.saddr.a6, | |
2101 | sizeof(struct in6_addr)); | |
2102 | memcpy(&daddr6, x->id.daddr.a6, | |
2103 | sizeof(struct in6_addr)); | |
2104 | } | |
2105 | audit_log_format(audit_buf, | |
96199558 | 2106 | " src=" NIP6_FMT " dst=" NIP6_FMT, |
161a09e7 JL |
2107 | NIP6(saddr6), NIP6(daddr6)); |
2108 | } | |
2109 | break; | |
2110 | } | |
2111 | ||
2112 | if (x) | |
2113 | audit_log_format(audit_buf, " spi=%lu(0x%lx) protocol=%s", | |
2114 | (unsigned long)ntohl(x->id.spi), | |
2115 | (unsigned long)ntohl(x->id.spi), | |
2116 | x->id.proto == IPPROTO_AH ? "AH" : | |
2117 | (x->id.proto == IPPROTO_ESP ? | |
2118 | "ESP" : "IPCOMP")); | |
2119 | ||
2120 | audit_log_format(audit_buf, " res=%u", result); | |
2121 | audit_log_end(audit_buf); | |
2122 | } | |
2123 | ||
2124 | EXPORT_SYMBOL(xfrm_audit_log); | |
c9204d9c | 2125 | #endif /* CONFIG_AUDITSYSCALL */ |
161a09e7 | 2126 | |
1da177e4 LT |
2127 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2128 | { | |
2129 | int err = 0; | |
2130 | if (unlikely(afinfo == NULL)) | |
2131 | return -EINVAL; | |
2132 | if (unlikely(afinfo->family >= NPROTO)) | |
2133 | return -EAFNOSUPPORT; | |
e959d812 | 2134 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2135 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2136 | err = -ENOBUFS; | |
2137 | else { | |
2138 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2139 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2140 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2141 | if (likely(dst_ops->check == NULL)) | |
2142 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2143 | if (likely(dst_ops->negative_advice == NULL)) |
2144 | dst_ops->negative_advice = xfrm_negative_advice; | |
2145 | if (likely(dst_ops->link_failure == NULL)) | |
2146 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2147 | if (likely(afinfo->garbage_collect == NULL)) |
2148 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2149 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2150 | } | |
e959d812 | 2151 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2152 | return err; |
2153 | } | |
2154 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2155 | ||
2156 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2157 | { | |
2158 | int err = 0; | |
2159 | if (unlikely(afinfo == NULL)) | |
2160 | return -EINVAL; | |
2161 | if (unlikely(afinfo->family >= NPROTO)) | |
2162 | return -EAFNOSUPPORT; | |
e959d812 | 2163 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2164 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2165 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2166 | err = -EINVAL; | |
2167 | else { | |
2168 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2169 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2170 | dst_ops->kmem_cachep = NULL; | |
2171 | dst_ops->check = NULL; | |
1da177e4 LT |
2172 | dst_ops->negative_advice = NULL; |
2173 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2174 | afinfo->garbage_collect = NULL; |
2175 | } | |
2176 | } | |
e959d812 | 2177 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2178 | return err; |
2179 | } | |
2180 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2181 | ||
2182 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2183 | { | |
2184 | struct xfrm_policy_afinfo *afinfo; | |
2185 | if (unlikely(family >= NPROTO)) | |
2186 | return NULL; | |
2187 | read_lock(&xfrm_policy_afinfo_lock); | |
2188 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2189 | if (unlikely(!afinfo)) |
2190 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2191 | return afinfo; |
2192 | } | |
2193 | ||
2194 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2195 | { | |
546be240 HX |
2196 | read_unlock(&xfrm_policy_afinfo_lock); |
2197 | } | |
2198 | ||
2199 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family) | |
2200 | { | |
2201 | struct xfrm_policy_afinfo *afinfo; | |
2202 | if (unlikely(family >= NPROTO)) | |
2203 | return NULL; | |
2204 | write_lock_bh(&xfrm_policy_afinfo_lock); | |
2205 | afinfo = xfrm_policy_afinfo[family]; | |
2206 | if (unlikely(!afinfo)) | |
2207 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
2208 | return afinfo; | |
2209 | } | |
2210 | ||
2211 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2212 | { | |
2213 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2214 | } |
2215 | ||
2216 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
2217 | { | |
2218 | switch (event) { | |
2219 | case NETDEV_DOWN: | |
2220 | xfrm_flush_bundles(); | |
2221 | } | |
2222 | return NOTIFY_DONE; | |
2223 | } | |
2224 | ||
2225 | static struct notifier_block xfrm_dev_notifier = { | |
2226 | xfrm_dev_event, | |
2227 | NULL, | |
2228 | 0 | |
2229 | }; | |
2230 | ||
2231 | static void __init xfrm_policy_init(void) | |
2232 | { | |
2518c7c2 DM |
2233 | unsigned int hmask, sz; |
2234 | int dir; | |
2235 | ||
1da177e4 LT |
2236 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2237 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2238 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
1da177e4 | 2239 | NULL, NULL); |
1da177e4 | 2240 | |
2518c7c2 DM |
2241 | hmask = 8 - 1; |
2242 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2243 | ||
44e36b42 | 2244 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2245 | xfrm_idx_hmask = hmask; |
2246 | if (!xfrm_policy_byidx) | |
2247 | panic("XFRM: failed to allocate byidx hash\n"); | |
2248 | ||
2249 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2250 | struct xfrm_policy_hash *htab; | |
2251 | ||
2252 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2253 | ||
2254 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2255 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2256 | htab->hmask = hmask; |
2257 | if (!htab->table) | |
2258 | panic("XFRM: failed to allocate bydst hash\n"); | |
2259 | } | |
2260 | ||
c4028958 | 2261 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2262 | register_netdevice_notifier(&xfrm_dev_notifier); |
2263 | } | |
2264 | ||
2265 | void __init xfrm_init(void) | |
2266 | { | |
2267 | xfrm_state_init(); | |
2268 | xfrm_policy_init(); | |
2269 | xfrm_input_init(); | |
2270 | } | |
2271 | ||
80c9abaa SS |
2272 | #ifdef CONFIG_XFRM_MIGRATE |
2273 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2274 | struct xfrm_selector *sel_tgt) | |
2275 | { | |
2276 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2277 | if (sel_tgt->family == sel_cmp->family && | |
2278 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2279 | sel_cmp->family) == 0 && |
80c9abaa SS |
2280 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2281 | sel_cmp->family) == 0 && | |
2282 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2283 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2284 | return 1; | |
2285 | } | |
2286 | } else { | |
2287 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2288 | return 1; | |
2289 | } | |
2290 | } | |
2291 | return 0; | |
2292 | } | |
2293 | ||
2294 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2295 | u8 dir, u8 type) | |
2296 | { | |
2297 | struct xfrm_policy *pol, *ret = NULL; | |
2298 | struct hlist_node *entry; | |
2299 | struct hlist_head *chain; | |
2300 | u32 priority = ~0U; | |
2301 | ||
2302 | read_lock_bh(&xfrm_policy_lock); | |
2303 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2304 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2305 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2306 | pol->type == type) { | |
2307 | ret = pol; | |
2308 | priority = ret->priority; | |
2309 | break; | |
2310 | } | |
2311 | } | |
2312 | chain = &xfrm_policy_inexact[dir]; | |
2313 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2314 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2315 | pol->type == type && | |
2316 | pol->priority < priority) { | |
2317 | ret = pol; | |
2318 | break; | |
2319 | } | |
2320 | } | |
2321 | ||
2322 | if (ret) | |
2323 | xfrm_pol_hold(ret); | |
2324 | ||
2325 | read_unlock_bh(&xfrm_policy_lock); | |
2326 | ||
2327 | return ret; | |
2328 | } | |
2329 | ||
2330 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2331 | { | |
2332 | int match = 0; | |
2333 | ||
2334 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2335 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2336 | switch (t->mode) { | |
2337 | case XFRM_MODE_TUNNEL: | |
2338 | case XFRM_MODE_BEET: | |
2339 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2340 | m->old_family) == 0 && | |
2341 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2342 | m->old_family) == 0) { | |
2343 | match = 1; | |
2344 | } | |
2345 | break; | |
2346 | case XFRM_MODE_TRANSPORT: | |
2347 | /* in case of transport mode, template does not store | |
2348 | any IP addresses, hence we just compare mode and | |
2349 | protocol */ | |
2350 | match = 1; | |
2351 | break; | |
2352 | default: | |
2353 | break; | |
2354 | } | |
2355 | } | |
2356 | return match; | |
2357 | } | |
2358 | ||
2359 | /* update endpoint address(es) of template(s) */ | |
2360 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2361 | struct xfrm_migrate *m, int num_migrate) | |
2362 | { | |
2363 | struct xfrm_migrate *mp; | |
2364 | struct dst_entry *dst; | |
2365 | int i, j, n = 0; | |
2366 | ||
2367 | write_lock_bh(&pol->lock); | |
2368 | if (unlikely(pol->dead)) { | |
2369 | /* target policy has been deleted */ | |
2370 | write_unlock_bh(&pol->lock); | |
2371 | return -ENOENT; | |
2372 | } | |
2373 | ||
2374 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2375 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2376 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2377 | continue; | |
2378 | n++; | |
2379 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL) | |
2380 | continue; | |
2381 | /* update endpoints */ | |
2382 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2383 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2384 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2385 | sizeof(pol->xfrm_vec[i].saddr)); | |
2386 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2387 | /* flush bundles */ | |
2388 | while ((dst = pol->bundles) != NULL) { | |
2389 | pol->bundles = dst->next; | |
2390 | dst_free(dst); | |
2391 | } | |
2392 | } | |
2393 | } | |
2394 | ||
2395 | write_unlock_bh(&pol->lock); | |
2396 | ||
2397 | if (!n) | |
2398 | return -ENODATA; | |
2399 | ||
2400 | return 0; | |
2401 | } | |
2402 | ||
2403 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2404 | { | |
2405 | int i, j; | |
2406 | ||
2407 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2408 | return -EINVAL; | |
2409 | ||
2410 | for (i = 0; i < num_migrate; i++) { | |
2411 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2412 | m[i].old_family) == 0) && | |
2413 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2414 | m[i].old_family) == 0)) | |
2415 | return -EINVAL; | |
2416 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2417 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2418 | return -EINVAL; | |
2419 | ||
2420 | /* check if there is any duplicated entry */ | |
2421 | for (j = i + 1; j < num_migrate; j++) { | |
2422 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2423 | sizeof(m[i].old_daddr)) && | |
2424 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2425 | sizeof(m[i].old_saddr)) && | |
2426 | m[i].proto == m[j].proto && | |
2427 | m[i].mode == m[j].mode && | |
2428 | m[i].reqid == m[j].reqid && | |
2429 | m[i].old_family == m[j].old_family) | |
2430 | return -EINVAL; | |
2431 | } | |
2432 | } | |
2433 | ||
2434 | return 0; | |
2435 | } | |
2436 | ||
2437 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
2438 | struct xfrm_migrate *m, int num_migrate) | |
2439 | { | |
2440 | int i, err, nx_cur = 0, nx_new = 0; | |
2441 | struct xfrm_policy *pol = NULL; | |
2442 | struct xfrm_state *x, *xc; | |
2443 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2444 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2445 | struct xfrm_migrate *mp; | |
2446 | ||
2447 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2448 | goto out; | |
2449 | ||
2450 | /* Stage 1 - find policy */ | |
2451 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2452 | err = -ENOENT; | |
2453 | goto out; | |
2454 | } | |
2455 | ||
2456 | /* Stage 2 - find and update state(s) */ | |
2457 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2458 | if ((x = xfrm_migrate_state_find(mp))) { | |
2459 | x_cur[nx_cur] = x; | |
2460 | nx_cur++; | |
2461 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2462 | x_new[nx_new] = xc; | |
2463 | nx_new++; | |
2464 | } else { | |
2465 | err = -ENODATA; | |
2466 | goto restore_state; | |
2467 | } | |
2468 | } | |
2469 | } | |
2470 | ||
2471 | /* Stage 3 - update policy */ | |
2472 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2473 | goto restore_state; | |
2474 | ||
2475 | /* Stage 4 - delete old state(s) */ | |
2476 | if (nx_cur) { | |
2477 | xfrm_states_put(x_cur, nx_cur); | |
2478 | xfrm_states_delete(x_cur, nx_cur); | |
2479 | } | |
2480 | ||
2481 | /* Stage 5 - announce */ | |
2482 | km_migrate(sel, dir, type, m, num_migrate); | |
2483 | ||
2484 | xfrm_pol_put(pol); | |
2485 | ||
2486 | return 0; | |
2487 | out: | |
2488 | return err; | |
2489 | ||
2490 | restore_state: | |
2491 | if (pol) | |
2492 | xfrm_pol_put(pol); | |
2493 | if (nx_cur) | |
2494 | xfrm_states_put(x_cur, nx_cur); | |
2495 | if (nx_new) | |
2496 | xfrm_states_delete(x_new, nx_new); | |
2497 | ||
2498 | return err; | |
2499 | } | |
e610e679 | 2500 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa SS |
2501 | #endif |
2502 |