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Commit | Line | Data |
---|---|---|
a716c119 | 1 | /* |
1da177e4 LT |
2 | * xfrm_policy.c |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * Kazunori MIYAZAWA @USAGI | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
1da177e4 LT |
16 | #include <linux/slab.h> |
17 | #include <linux/kmod.h> | |
18 | #include <linux/list.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/workqueue.h> | |
21 | #include <linux/notifier.h> | |
22 | #include <linux/netdevice.h> | |
eb9c7ebe | 23 | #include <linux/netfilter.h> |
1da177e4 | 24 | #include <linux/module.h> |
2518c7c2 | 25 | #include <linux/cache.h> |
1da177e4 LT |
26 | #include <net/xfrm.h> |
27 | #include <net/ip.h> | |
161a09e7 | 28 | #include <linux/audit.h> |
aad0e0b9 | 29 | #include <linux/cache.h> |
1da177e4 | 30 | |
44e36b42 DM |
31 | #include "xfrm_hash.h" |
32 | ||
aad0e0b9 | 33 | int sysctl_xfrm_larval_drop __read_mostly; |
14e50e57 | 34 | |
4a3e2f71 AV |
35 | DEFINE_MUTEX(xfrm_cfg_mutex); |
36 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 LT |
37 | |
38 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
39 | ||
2518c7c2 DM |
40 | unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; |
41 | EXPORT_SYMBOL(xfrm_policy_count); | |
1da177e4 LT |
42 | |
43 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); | |
44 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
45 | ||
e18b890b | 46 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 LT |
47 | |
48 | static struct work_struct xfrm_policy_gc_work; | |
2518c7c2 | 49 | static HLIST_HEAD(xfrm_policy_gc_list); |
1da177e4 LT |
50 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
51 | ||
52 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
53 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
546be240 HX |
54 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family); |
55 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo); | |
1da177e4 | 56 | |
77681021 AM |
57 | static inline int |
58 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
59 | { | |
60 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
61 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
62 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
63 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
64 | (fl->proto == sel->proto || !sel->proto) && | |
65 | (fl->oif == sel->ifindex || !sel->ifindex); | |
66 | } | |
67 | ||
68 | static inline int | |
69 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
70 | { | |
71 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
72 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
73 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
74 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
75 | (fl->proto == sel->proto || !sel->proto) && | |
76 | (fl->oif == sel->ifindex || !sel->ifindex); | |
77 | } | |
78 | ||
79 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
80 | unsigned short family) | |
81 | { | |
82 | switch (family) { | |
83 | case AF_INET: | |
84 | return __xfrm4_selector_match(sel, fl); | |
85 | case AF_INET6: | |
86 | return __xfrm6_selector_match(sel, fl); | |
87 | } | |
88 | return 0; | |
89 | } | |
90 | ||
1da177e4 LT |
91 | int xfrm_register_type(struct xfrm_type *type, unsigned short family) |
92 | { | |
546be240 HX |
93 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family); |
94 | struct xfrm_type **typemap; | |
1da177e4 LT |
95 | int err = 0; |
96 | ||
97 | if (unlikely(afinfo == NULL)) | |
98 | return -EAFNOSUPPORT; | |
99 | typemap = afinfo->type_map; | |
100 | ||
546be240 HX |
101 | if (likely(typemap[type->proto] == NULL)) |
102 | typemap[type->proto] = type; | |
1da177e4 LT |
103 | else |
104 | err = -EEXIST; | |
546be240 | 105 | xfrm_policy_unlock_afinfo(afinfo); |
1da177e4 LT |
106 | return err; |
107 | } | |
108 | EXPORT_SYMBOL(xfrm_register_type); | |
109 | ||
110 | int xfrm_unregister_type(struct xfrm_type *type, unsigned short family) | |
111 | { | |
546be240 HX |
112 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_lock_afinfo(family); |
113 | struct xfrm_type **typemap; | |
1da177e4 LT |
114 | int err = 0; |
115 | ||
116 | if (unlikely(afinfo == NULL)) | |
117 | return -EAFNOSUPPORT; | |
118 | typemap = afinfo->type_map; | |
119 | ||
546be240 | 120 | if (unlikely(typemap[type->proto] != type)) |
1da177e4 LT |
121 | err = -ENOENT; |
122 | else | |
546be240 HX |
123 | typemap[type->proto] = NULL; |
124 | xfrm_policy_unlock_afinfo(afinfo); | |
1da177e4 LT |
125 | return err; |
126 | } | |
127 | EXPORT_SYMBOL(xfrm_unregister_type); | |
128 | ||
129 | struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) | |
130 | { | |
131 | struct xfrm_policy_afinfo *afinfo; | |
546be240 | 132 | struct xfrm_type **typemap; |
1da177e4 LT |
133 | struct xfrm_type *type; |
134 | int modload_attempted = 0; | |
135 | ||
136 | retry: | |
137 | afinfo = xfrm_policy_get_afinfo(family); | |
138 | if (unlikely(afinfo == NULL)) | |
139 | return NULL; | |
140 | typemap = afinfo->type_map; | |
141 | ||
546be240 | 142 | type = typemap[proto]; |
1da177e4 LT |
143 | if (unlikely(type && !try_module_get(type->owner))) |
144 | type = NULL; | |
1da177e4 LT |
145 | if (!type && !modload_attempted) { |
146 | xfrm_policy_put_afinfo(afinfo); | |
147 | request_module("xfrm-type-%d-%d", | |
148 | (int) family, (int) proto); | |
149 | modload_attempted = 1; | |
150 | goto retry; | |
151 | } | |
152 | ||
153 | xfrm_policy_put_afinfo(afinfo); | |
154 | return type; | |
155 | } | |
1da177e4 | 156 | |
a716c119 | 157 | int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, |
1da177e4 LT |
158 | unsigned short family) |
159 | { | |
160 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
161 | int err = 0; | |
162 | ||
163 | if (unlikely(afinfo == NULL)) | |
164 | return -EAFNOSUPPORT; | |
165 | ||
166 | if (likely(afinfo->dst_lookup != NULL)) | |
167 | err = afinfo->dst_lookup(dst, fl); | |
168 | else | |
169 | err = -EINVAL; | |
170 | xfrm_policy_put_afinfo(afinfo); | |
171 | return err; | |
172 | } | |
173 | EXPORT_SYMBOL(xfrm_dst_lookup); | |
174 | ||
175 | void xfrm_put_type(struct xfrm_type *type) | |
176 | { | |
177 | module_put(type->owner); | |
178 | } | |
179 | ||
b59f45d0 HX |
180 | int xfrm_register_mode(struct xfrm_mode *mode, int family) |
181 | { | |
182 | struct xfrm_policy_afinfo *afinfo; | |
183 | struct xfrm_mode **modemap; | |
184 | int err; | |
185 | ||
186 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
187 | return -EINVAL; | |
188 | ||
189 | afinfo = xfrm_policy_lock_afinfo(family); | |
190 | if (unlikely(afinfo == NULL)) | |
191 | return -EAFNOSUPPORT; | |
192 | ||
193 | err = -EEXIST; | |
194 | modemap = afinfo->mode_map; | |
195 | if (likely(modemap[mode->encap] == NULL)) { | |
196 | modemap[mode->encap] = mode; | |
197 | err = 0; | |
198 | } | |
199 | ||
200 | xfrm_policy_unlock_afinfo(afinfo); | |
201 | return err; | |
202 | } | |
203 | EXPORT_SYMBOL(xfrm_register_mode); | |
204 | ||
205 | int xfrm_unregister_mode(struct xfrm_mode *mode, int family) | |
206 | { | |
207 | struct xfrm_policy_afinfo *afinfo; | |
208 | struct xfrm_mode **modemap; | |
209 | int err; | |
210 | ||
211 | if (unlikely(mode->encap >= XFRM_MODE_MAX)) | |
212 | return -EINVAL; | |
213 | ||
214 | afinfo = xfrm_policy_lock_afinfo(family); | |
215 | if (unlikely(afinfo == NULL)) | |
216 | return -EAFNOSUPPORT; | |
217 | ||
218 | err = -ENOENT; | |
219 | modemap = afinfo->mode_map; | |
220 | if (likely(modemap[mode->encap] == mode)) { | |
221 | modemap[mode->encap] = NULL; | |
222 | err = 0; | |
223 | } | |
224 | ||
225 | xfrm_policy_unlock_afinfo(afinfo); | |
226 | return err; | |
227 | } | |
228 | EXPORT_SYMBOL(xfrm_unregister_mode); | |
229 | ||
230 | struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) | |
231 | { | |
232 | struct xfrm_policy_afinfo *afinfo; | |
233 | struct xfrm_mode *mode; | |
234 | int modload_attempted = 0; | |
235 | ||
236 | if (unlikely(encap >= XFRM_MODE_MAX)) | |
237 | return NULL; | |
238 | ||
239 | retry: | |
240 | afinfo = xfrm_policy_get_afinfo(family); | |
241 | if (unlikely(afinfo == NULL)) | |
242 | return NULL; | |
243 | ||
244 | mode = afinfo->mode_map[encap]; | |
245 | if (unlikely(mode && !try_module_get(mode->owner))) | |
246 | mode = NULL; | |
247 | if (!mode && !modload_attempted) { | |
248 | xfrm_policy_put_afinfo(afinfo); | |
249 | request_module("xfrm-mode-%d-%d", family, encap); | |
250 | modload_attempted = 1; | |
251 | goto retry; | |
252 | } | |
253 | ||
254 | xfrm_policy_put_afinfo(afinfo); | |
255 | return mode; | |
256 | } | |
257 | ||
258 | void xfrm_put_mode(struct xfrm_mode *mode) | |
259 | { | |
260 | module_put(mode->owner); | |
261 | } | |
262 | ||
1da177e4 LT |
263 | static inline unsigned long make_jiffies(long secs) |
264 | { | |
265 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
266 | return MAX_SCHEDULE_TIMEOUT-1; | |
267 | else | |
a716c119 | 268 | return secs*HZ; |
1da177e4 LT |
269 | } |
270 | ||
271 | static void xfrm_policy_timer(unsigned long data) | |
272 | { | |
273 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 274 | unsigned long now = get_seconds(); |
1da177e4 LT |
275 | long next = LONG_MAX; |
276 | int warn = 0; | |
277 | int dir; | |
278 | ||
279 | read_lock(&xp->lock); | |
280 | ||
281 | if (xp->dead) | |
282 | goto out; | |
283 | ||
77d8d7a6 | 284 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
285 | |
286 | if (xp->lft.hard_add_expires_seconds) { | |
287 | long tmo = xp->lft.hard_add_expires_seconds + | |
288 | xp->curlft.add_time - now; | |
289 | if (tmo <= 0) | |
290 | goto expired; | |
291 | if (tmo < next) | |
292 | next = tmo; | |
293 | } | |
294 | if (xp->lft.hard_use_expires_seconds) { | |
295 | long tmo = xp->lft.hard_use_expires_seconds + | |
296 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
297 | if (tmo <= 0) | |
298 | goto expired; | |
299 | if (tmo < next) | |
300 | next = tmo; | |
301 | } | |
302 | if (xp->lft.soft_add_expires_seconds) { | |
303 | long tmo = xp->lft.soft_add_expires_seconds + | |
304 | xp->curlft.add_time - now; | |
305 | if (tmo <= 0) { | |
306 | warn = 1; | |
307 | tmo = XFRM_KM_TIMEOUT; | |
308 | } | |
309 | if (tmo < next) | |
310 | next = tmo; | |
311 | } | |
312 | if (xp->lft.soft_use_expires_seconds) { | |
313 | long tmo = xp->lft.soft_use_expires_seconds + | |
314 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
315 | if (tmo <= 0) { | |
316 | warn = 1; | |
317 | tmo = XFRM_KM_TIMEOUT; | |
318 | } | |
319 | if (tmo < next) | |
320 | next = tmo; | |
321 | } | |
322 | ||
323 | if (warn) | |
6c5c8ca7 | 324 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
325 | if (next != LONG_MAX && |
326 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
327 | xfrm_pol_hold(xp); | |
328 | ||
329 | out: | |
330 | read_unlock(&xp->lock); | |
331 | xfrm_pol_put(xp); | |
332 | return; | |
333 | ||
334 | expired: | |
335 | read_unlock(&xp->lock); | |
4666faab | 336 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 337 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
338 | xfrm_pol_put(xp); |
339 | } | |
340 | ||
341 | ||
342 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
343 | * SPD calls. | |
344 | */ | |
345 | ||
dd0fc66f | 346 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
1da177e4 LT |
347 | { |
348 | struct xfrm_policy *policy; | |
349 | ||
0da974f4 | 350 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
351 | |
352 | if (policy) { | |
2518c7c2 DM |
353 | INIT_HLIST_NODE(&policy->bydst); |
354 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 355 | rwlock_init(&policy->lock); |
2518c7c2 | 356 | atomic_set(&policy->refcnt, 1); |
1da177e4 LT |
357 | init_timer(&policy->timer); |
358 | policy->timer.data = (unsigned long)policy; | |
359 | policy->timer.function = xfrm_policy_timer; | |
360 | } | |
361 | return policy; | |
362 | } | |
363 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
364 | ||
365 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
366 | ||
367 | void __xfrm_policy_destroy(struct xfrm_policy *policy) | |
368 | { | |
09a62660 | 369 | BUG_ON(!policy->dead); |
1da177e4 | 370 | |
09a62660 | 371 | BUG_ON(policy->bundles); |
1da177e4 LT |
372 | |
373 | if (del_timer(&policy->timer)) | |
374 | BUG(); | |
375 | ||
df71837d | 376 | security_xfrm_policy_free(policy); |
1da177e4 LT |
377 | kfree(policy); |
378 | } | |
379 | EXPORT_SYMBOL(__xfrm_policy_destroy); | |
380 | ||
381 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
382 | { | |
383 | struct dst_entry *dst; | |
384 | ||
385 | while ((dst = policy->bundles) != NULL) { | |
386 | policy->bundles = dst->next; | |
387 | dst_free(dst); | |
388 | } | |
389 | ||
390 | if (del_timer(&policy->timer)) | |
391 | atomic_dec(&policy->refcnt); | |
392 | ||
393 | if (atomic_read(&policy->refcnt) > 1) | |
394 | flow_cache_flush(); | |
395 | ||
396 | xfrm_pol_put(policy); | |
397 | } | |
398 | ||
c4028958 | 399 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
400 | { |
401 | struct xfrm_policy *policy; | |
2518c7c2 DM |
402 | struct hlist_node *entry, *tmp; |
403 | struct hlist_head gc_list; | |
1da177e4 LT |
404 | |
405 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
406 | gc_list.first = xfrm_policy_gc_list.first; |
407 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
408 | spin_unlock_bh(&xfrm_policy_gc_lock); |
409 | ||
2518c7c2 | 410 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 411 | xfrm_policy_gc_kill(policy); |
1da177e4 LT |
412 | } |
413 | ||
414 | /* Rule must be locked. Release descentant resources, announce | |
415 | * entry dead. The rule must be unlinked from lists to the moment. | |
416 | */ | |
417 | ||
418 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
419 | { | |
420 | int dead; | |
421 | ||
422 | write_lock_bh(&policy->lock); | |
423 | dead = policy->dead; | |
424 | policy->dead = 1; | |
425 | write_unlock_bh(&policy->lock); | |
426 | ||
427 | if (unlikely(dead)) { | |
428 | WARN_ON(1); | |
429 | return; | |
430 | } | |
431 | ||
432 | spin_lock(&xfrm_policy_gc_lock); | |
2518c7c2 | 433 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
1da177e4 LT |
434 | spin_unlock(&xfrm_policy_gc_lock); |
435 | ||
436 | schedule_work(&xfrm_policy_gc_work); | |
437 | } | |
438 | ||
2518c7c2 DM |
439 | struct xfrm_policy_hash { |
440 | struct hlist_head *table; | |
441 | unsigned int hmask; | |
442 | }; | |
443 | ||
444 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
445 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
446 | static struct hlist_head *xfrm_policy_byidx __read_mostly; | |
447 | static unsigned int xfrm_idx_hmask __read_mostly; | |
448 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
449 | ||
2518c7c2 DM |
450 | static inline unsigned int idx_hash(u32 index) |
451 | { | |
452 | return __idx_hash(index, xfrm_idx_hmask); | |
453 | } | |
454 | ||
2518c7c2 DM |
455 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
456 | { | |
457 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
458 | unsigned int hash = __sel_hash(sel, family, hmask); | |
459 | ||
460 | return (hash == hmask + 1 ? | |
461 | &xfrm_policy_inexact[dir] : | |
462 | xfrm_policy_bydst[dir].table + hash); | |
463 | } | |
464 | ||
465 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
466 | { | |
467 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
468 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
469 | ||
470 | return xfrm_policy_bydst[dir].table + hash; | |
471 | } | |
472 | ||
2518c7c2 DM |
473 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
474 | struct hlist_head *ndsttable, | |
475 | unsigned int nhashmask) | |
476 | { | |
477 | struct hlist_node *entry, *tmp; | |
478 | struct xfrm_policy *pol; | |
479 | ||
480 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { | |
481 | unsigned int h; | |
482 | ||
483 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
484 | pol->family, nhashmask); | |
485 | hlist_add_head(&pol->bydst, ndsttable+h); | |
486 | } | |
487 | } | |
488 | ||
489 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
490 | struct hlist_head *nidxtable, | |
491 | unsigned int nhashmask) | |
492 | { | |
493 | struct hlist_node *entry, *tmp; | |
494 | struct xfrm_policy *pol; | |
495 | ||
496 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
497 | unsigned int h; | |
498 | ||
499 | h = __idx_hash(pol->index, nhashmask); | |
500 | hlist_add_head(&pol->byidx, nidxtable+h); | |
501 | } | |
502 | } | |
503 | ||
504 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
505 | { | |
506 | return ((old_hmask + 1) << 1) - 1; | |
507 | } | |
508 | ||
509 | static void xfrm_bydst_resize(int dir) | |
510 | { | |
511 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
512 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
513 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
514 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 515 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
516 | int i; |
517 | ||
518 | if (!ndst) | |
519 | return; | |
520 | ||
521 | write_lock_bh(&xfrm_policy_lock); | |
522 | ||
523 | for (i = hmask; i >= 0; i--) | |
524 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
525 | ||
526 | xfrm_policy_bydst[dir].table = ndst; | |
527 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
528 | ||
529 | write_unlock_bh(&xfrm_policy_lock); | |
530 | ||
44e36b42 | 531 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
532 | } |
533 | ||
534 | static void xfrm_byidx_resize(int total) | |
535 | { | |
536 | unsigned int hmask = xfrm_idx_hmask; | |
537 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
538 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
539 | struct hlist_head *oidx = xfrm_policy_byidx; | |
44e36b42 | 540 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
541 | int i; |
542 | ||
543 | if (!nidx) | |
544 | return; | |
545 | ||
546 | write_lock_bh(&xfrm_policy_lock); | |
547 | ||
548 | for (i = hmask; i >= 0; i--) | |
549 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
550 | ||
551 | xfrm_policy_byidx = nidx; | |
552 | xfrm_idx_hmask = nhashmask; | |
553 | ||
554 | write_unlock_bh(&xfrm_policy_lock); | |
555 | ||
44e36b42 | 556 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
557 | } |
558 | ||
559 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
560 | { | |
561 | unsigned int cnt = xfrm_policy_count[dir]; | |
562 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
563 | ||
564 | if (total) | |
565 | *total += cnt; | |
566 | ||
567 | if ((hmask + 1) < xfrm_policy_hashmax && | |
568 | cnt > hmask) | |
569 | return 1; | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | static inline int xfrm_byidx_should_resize(int total) | |
575 | { | |
576 | unsigned int hmask = xfrm_idx_hmask; | |
577 | ||
578 | if ((hmask + 1) < xfrm_policy_hashmax && | |
579 | total > hmask) | |
580 | return 1; | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
5a6d3416 | 585 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
586 | { |
587 | read_lock_bh(&xfrm_policy_lock); | |
588 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
589 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
590 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
591 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
592 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
593 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
594 | si->spdhcnt = xfrm_idx_hmask; | |
595 | si->spdhmcnt = xfrm_policy_hashmax; | |
596 | read_unlock_bh(&xfrm_policy_lock); | |
597 | } | |
598 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 599 | |
ecfd6b18 | 600 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 601 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
602 | { |
603 | int dir, total; | |
604 | ||
605 | mutex_lock(&hash_resize_mutex); | |
606 | ||
607 | total = 0; | |
608 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
609 | if (xfrm_bydst_should_resize(dir, &total)) | |
610 | xfrm_bydst_resize(dir); | |
611 | } | |
612 | if (xfrm_byidx_should_resize(total)) | |
613 | xfrm_byidx_resize(total); | |
614 | ||
615 | mutex_unlock(&hash_resize_mutex); | |
616 | } | |
617 | ||
c4028958 | 618 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 619 | |
1da177e4 LT |
620 | /* Generate new index... KAME seems to generate them ordered by cost |
621 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
4e81bb83 | 622 | static u32 xfrm_gen_index(u8 type, int dir) |
1da177e4 | 623 | { |
1da177e4 LT |
624 | static u32 idx_generator; |
625 | ||
626 | for (;;) { | |
2518c7c2 DM |
627 | struct hlist_node *entry; |
628 | struct hlist_head *list; | |
629 | struct xfrm_policy *p; | |
630 | u32 idx; | |
631 | int found; | |
632 | ||
1da177e4 LT |
633 | idx = (idx_generator | dir); |
634 | idx_generator += 8; | |
635 | if (idx == 0) | |
636 | idx = 8; | |
2518c7c2 DM |
637 | list = xfrm_policy_byidx + idx_hash(idx); |
638 | found = 0; | |
639 | hlist_for_each_entry(p, entry, list, byidx) { | |
640 | if (p->index == idx) { | |
641 | found = 1; | |
1da177e4 | 642 | break; |
2518c7c2 | 643 | } |
1da177e4 | 644 | } |
2518c7c2 | 645 | if (!found) |
1da177e4 LT |
646 | return idx; |
647 | } | |
648 | } | |
649 | ||
2518c7c2 DM |
650 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
651 | { | |
652 | u32 *p1 = (u32 *) s1; | |
653 | u32 *p2 = (u32 *) s2; | |
654 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
655 | int i; | |
656 | ||
657 | for (i = 0; i < len; i++) { | |
658 | if (p1[i] != p2[i]) | |
659 | return 1; | |
660 | } | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
1da177e4 LT |
665 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
666 | { | |
2518c7c2 DM |
667 | struct xfrm_policy *pol; |
668 | struct xfrm_policy *delpol; | |
669 | struct hlist_head *chain; | |
a6c7ab55 | 670 | struct hlist_node *entry, *newpos; |
9b78a82c | 671 | struct dst_entry *gc_list; |
1da177e4 LT |
672 | |
673 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
674 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
675 | delpol = NULL; | |
676 | newpos = NULL; | |
2518c7c2 | 677 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 678 | if (pol->type == policy->type && |
2518c7c2 | 679 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
680 | xfrm_sec_ctx_match(pol->security, policy->security) && |
681 | !WARN_ON(delpol)) { | |
1da177e4 LT |
682 | if (excl) { |
683 | write_unlock_bh(&xfrm_policy_lock); | |
684 | return -EEXIST; | |
685 | } | |
1da177e4 LT |
686 | delpol = pol; |
687 | if (policy->priority > pol->priority) | |
688 | continue; | |
689 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 690 | newpos = &pol->bydst; |
1da177e4 LT |
691 | continue; |
692 | } | |
1da177e4 LT |
693 | if (delpol) |
694 | break; | |
1da177e4 LT |
695 | } |
696 | if (newpos) | |
2518c7c2 DM |
697 | hlist_add_after(newpos, &policy->bydst); |
698 | else | |
699 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 700 | xfrm_pol_hold(policy); |
2518c7c2 | 701 | xfrm_policy_count[dir]++; |
1da177e4 | 702 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
703 | if (delpol) { |
704 | hlist_del(&delpol->bydst); | |
705 | hlist_del(&delpol->byidx); | |
706 | xfrm_policy_count[dir]--; | |
707 | } | |
4e81bb83 | 708 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 709 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 710 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
711 | policy->curlft.use_time = 0; |
712 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
713 | xfrm_pol_hold(policy); | |
714 | write_unlock_bh(&xfrm_policy_lock); | |
715 | ||
9b78a82c | 716 | if (delpol) |
1da177e4 | 717 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
718 | else if (xfrm_bydst_should_resize(dir, NULL)) |
719 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
720 | |
721 | read_lock_bh(&xfrm_policy_lock); | |
722 | gc_list = NULL; | |
2518c7c2 DM |
723 | entry = &policy->bydst; |
724 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
725 | struct dst_entry *dst; |
726 | ||
727 | write_lock(&policy->lock); | |
728 | dst = policy->bundles; | |
729 | if (dst) { | |
730 | struct dst_entry *tail = dst; | |
731 | while (tail->next) | |
732 | tail = tail->next; | |
733 | tail->next = gc_list; | |
734 | gc_list = dst; | |
735 | ||
736 | policy->bundles = NULL; | |
737 | } | |
738 | write_unlock(&policy->lock); | |
1da177e4 | 739 | } |
9b78a82c DM |
740 | read_unlock_bh(&xfrm_policy_lock); |
741 | ||
742 | while (gc_list) { | |
743 | struct dst_entry *dst = gc_list; | |
744 | ||
745 | gc_list = dst->next; | |
746 | dst_free(dst); | |
747 | } | |
748 | ||
1da177e4 LT |
749 | return 0; |
750 | } | |
751 | EXPORT_SYMBOL(xfrm_policy_insert); | |
752 | ||
4e81bb83 MN |
753 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
754 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
755 | struct xfrm_sec_ctx *ctx, int delete, |
756 | int *err) | |
1da177e4 | 757 | { |
2518c7c2 DM |
758 | struct xfrm_policy *pol, *ret; |
759 | struct hlist_head *chain; | |
760 | struct hlist_node *entry; | |
1da177e4 | 761 | |
ef41aaa0 | 762 | *err = 0; |
1da177e4 | 763 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
764 | chain = policy_hash_bysel(sel, sel->family, dir); |
765 | ret = NULL; | |
766 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
767 | if (pol->type == type && | |
768 | !selector_cmp(sel, &pol->selector) && | |
769 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 770 | xfrm_pol_hold(pol); |
2518c7c2 | 771 | if (delete) { |
ef41aaa0 EP |
772 | *err = security_xfrm_policy_delete(pol); |
773 | if (*err) { | |
774 | write_unlock_bh(&xfrm_policy_lock); | |
775 | return pol; | |
776 | } | |
2518c7c2 DM |
777 | hlist_del(&pol->bydst); |
778 | hlist_del(&pol->byidx); | |
779 | xfrm_policy_count[dir]--; | |
780 | } | |
781 | ret = pol; | |
1da177e4 LT |
782 | break; |
783 | } | |
784 | } | |
785 | write_unlock_bh(&xfrm_policy_lock); | |
786 | ||
2518c7c2 | 787 | if (ret && delete) { |
1da177e4 | 788 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 789 | xfrm_policy_kill(ret); |
1da177e4 | 790 | } |
2518c7c2 | 791 | return ret; |
1da177e4 | 792 | } |
df71837d | 793 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 794 | |
ef41aaa0 EP |
795 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
796 | int *err) | |
1da177e4 | 797 | { |
2518c7c2 DM |
798 | struct xfrm_policy *pol, *ret; |
799 | struct hlist_head *chain; | |
800 | struct hlist_node *entry; | |
1da177e4 | 801 | |
b5505c6e HX |
802 | *err = -ENOENT; |
803 | if (xfrm_policy_id2dir(id) != dir) | |
804 | return NULL; | |
805 | ||
ef41aaa0 | 806 | *err = 0; |
1da177e4 | 807 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
808 | chain = xfrm_policy_byidx + idx_hash(id); |
809 | ret = NULL; | |
810 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
811 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 812 | xfrm_pol_hold(pol); |
2518c7c2 | 813 | if (delete) { |
ef41aaa0 EP |
814 | *err = security_xfrm_policy_delete(pol); |
815 | if (*err) { | |
816 | write_unlock_bh(&xfrm_policy_lock); | |
817 | return pol; | |
818 | } | |
2518c7c2 DM |
819 | hlist_del(&pol->bydst); |
820 | hlist_del(&pol->byidx); | |
821 | xfrm_policy_count[dir]--; | |
822 | } | |
823 | ret = pol; | |
1da177e4 LT |
824 | break; |
825 | } | |
826 | } | |
827 | write_unlock_bh(&xfrm_policy_lock); | |
828 | ||
2518c7c2 | 829 | if (ret && delete) { |
1da177e4 | 830 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 831 | xfrm_policy_kill(ret); |
1da177e4 | 832 | } |
2518c7c2 | 833 | return ret; |
1da177e4 LT |
834 | } |
835 | EXPORT_SYMBOL(xfrm_policy_byid); | |
836 | ||
4aa2e62c JL |
837 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
838 | static inline int | |
839 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
1da177e4 | 840 | { |
4aa2e62c JL |
841 | int dir, err = 0; |
842 | ||
843 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
844 | struct xfrm_policy *pol; | |
845 | struct hlist_node *entry; | |
846 | int i; | |
847 | ||
848 | hlist_for_each_entry(pol, entry, | |
849 | &xfrm_policy_inexact[dir], bydst) { | |
850 | if (pol->type != type) | |
851 | continue; | |
852 | err = security_xfrm_policy_delete(pol); | |
853 | if (err) { | |
854 | xfrm_audit_log(audit_info->loginuid, | |
855 | audit_info->secid, | |
856 | AUDIT_MAC_IPSEC_DELSPD, 0, | |
857 | pol, NULL); | |
858 | return err; | |
859 | } | |
7dc12d6d | 860 | } |
4aa2e62c JL |
861 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
862 | hlist_for_each_entry(pol, entry, | |
863 | xfrm_policy_bydst[dir].table + i, | |
864 | bydst) { | |
865 | if (pol->type != type) | |
866 | continue; | |
867 | err = security_xfrm_policy_delete(pol); | |
868 | if (err) { | |
869 | xfrm_audit_log(audit_info->loginuid, | |
870 | audit_info->secid, | |
871 | AUDIT_MAC_IPSEC_DELSPD, | |
872 | 0, pol, NULL); | |
873 | return err; | |
874 | } | |
875 | } | |
876 | } | |
877 | } | |
878 | return err; | |
879 | } | |
880 | #else | |
881 | static inline int | |
882 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
883 | { | |
884 | return 0; | |
885 | } | |
886 | #endif | |
887 | ||
888 | int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) | |
889 | { | |
890 | int dir, err = 0; | |
1da177e4 LT |
891 | |
892 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c JL |
893 | |
894 | err = xfrm_policy_flush_secctx_check(type, audit_info); | |
895 | if (err) | |
896 | goto out; | |
897 | ||
1da177e4 | 898 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
899 | struct xfrm_policy *pol; |
900 | struct hlist_node *entry; | |
ae8c0577 | 901 | int i, killed; |
2518c7c2 | 902 | |
ae8c0577 | 903 | killed = 0; |
2518c7c2 DM |
904 | again1: |
905 | hlist_for_each_entry(pol, entry, | |
906 | &xfrm_policy_inexact[dir], bydst) { | |
907 | if (pol->type != type) | |
908 | continue; | |
909 | hlist_del(&pol->bydst); | |
910 | hlist_del(&pol->byidx); | |
1da177e4 LT |
911 | write_unlock_bh(&xfrm_policy_lock); |
912 | ||
161a09e7 JL |
913 | xfrm_audit_log(audit_info->loginuid, audit_info->secid, |
914 | AUDIT_MAC_IPSEC_DELSPD, 1, pol, NULL); | |
915 | ||
2518c7c2 | 916 | xfrm_policy_kill(pol); |
ae8c0577 | 917 | killed++; |
1da177e4 LT |
918 | |
919 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
920 | goto again1; |
921 | } | |
922 | ||
923 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
924 | again2: | |
925 | hlist_for_each_entry(pol, entry, | |
926 | xfrm_policy_bydst[dir].table + i, | |
927 | bydst) { | |
928 | if (pol->type != type) | |
929 | continue; | |
930 | hlist_del(&pol->bydst); | |
931 | hlist_del(&pol->byidx); | |
932 | write_unlock_bh(&xfrm_policy_lock); | |
933 | ||
161a09e7 JL |
934 | xfrm_audit_log(audit_info->loginuid, |
935 | audit_info->secid, | |
936 | AUDIT_MAC_IPSEC_DELSPD, 1, | |
937 | pol, NULL); | |
938 | ||
2518c7c2 | 939 | xfrm_policy_kill(pol); |
ae8c0577 | 940 | killed++; |
2518c7c2 DM |
941 | |
942 | write_lock_bh(&xfrm_policy_lock); | |
943 | goto again2; | |
944 | } | |
1da177e4 | 945 | } |
2518c7c2 | 946 | |
ae8c0577 | 947 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
948 | } |
949 | atomic_inc(&flow_cache_genid); | |
4aa2e62c | 950 | out: |
1da177e4 | 951 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 952 | return err; |
1da177e4 LT |
953 | } |
954 | EXPORT_SYMBOL(xfrm_policy_flush); | |
955 | ||
4e81bb83 | 956 | int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
957 | void *data) |
958 | { | |
baf5d743 | 959 | struct xfrm_policy *pol, *last = NULL; |
2518c7c2 | 960 | struct hlist_node *entry; |
baf5d743 | 961 | int dir, last_dir = 0, count, error; |
1da177e4 LT |
962 | |
963 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 | 964 | count = 0; |
1da177e4 LT |
965 | |
966 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
967 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
968 | int i; | |
969 | ||
970 | hlist_for_each_entry(pol, entry, | |
971 | &xfrm_policy_inexact[dir], bydst) { | |
972 | if (pol->type != type) | |
973 | continue; | |
baf5d743 JHS |
974 | if (last) { |
975 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
976 | count, data); | |
977 | if (error) | |
978 | goto out; | |
979 | } | |
980 | last = pol; | |
981 | last_dir = dir; | |
982 | count++; | |
1da177e4 | 983 | } |
2518c7c2 DM |
984 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
985 | hlist_for_each_entry(pol, entry, table + i, bydst) { | |
986 | if (pol->type != type) | |
987 | continue; | |
baf5d743 JHS |
988 | if (last) { |
989 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
990 | count, data); | |
991 | if (error) | |
992 | goto out; | |
993 | } | |
994 | last = pol; | |
995 | last_dir = dir; | |
996 | count++; | |
2518c7c2 DM |
997 | } |
998 | } | |
1da177e4 | 999 | } |
baf5d743 JHS |
1000 | if (count == 0) { |
1001 | error = -ENOENT; | |
1002 | goto out; | |
1003 | } | |
1004 | error = func(last, last_dir % XFRM_POLICY_MAX, 0, data); | |
1da177e4 LT |
1005 | out: |
1006 | read_unlock_bh(&xfrm_policy_lock); | |
1007 | return error; | |
1008 | } | |
1009 | EXPORT_SYMBOL(xfrm_policy_walk); | |
1010 | ||
134b0fc5 JM |
1011 | /* |
1012 | * Find policy to apply to this flow. | |
1013 | * | |
1014 | * Returns 0 if policy found, else an -errno. | |
1015 | */ | |
2518c7c2 DM |
1016 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
1017 | u8 type, u16 family, int dir) | |
1da177e4 | 1018 | { |
2518c7c2 | 1019 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 1020 | int match, ret = -ESRCH; |
1da177e4 | 1021 | |
2518c7c2 DM |
1022 | if (pol->family != family || |
1023 | pol->type != type) | |
134b0fc5 | 1024 | return ret; |
1da177e4 | 1025 | |
2518c7c2 | 1026 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 JM |
1027 | if (match) |
1028 | ret = security_xfrm_policy_lookup(pol, fl->secid, dir); | |
2518c7c2 | 1029 | |
134b0fc5 | 1030 | return ret; |
2518c7c2 | 1031 | } |
1da177e4 | 1032 | |
2518c7c2 DM |
1033 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
1034 | u16 family, u8 dir) | |
1035 | { | |
134b0fc5 | 1036 | int err; |
2518c7c2 DM |
1037 | struct xfrm_policy *pol, *ret; |
1038 | xfrm_address_t *daddr, *saddr; | |
1039 | struct hlist_node *entry; | |
1040 | struct hlist_head *chain; | |
acba48e1 | 1041 | u32 priority = ~0U; |
df71837d | 1042 | |
2518c7c2 DM |
1043 | daddr = xfrm_flowi_daddr(fl, family); |
1044 | saddr = xfrm_flowi_saddr(fl, family); | |
1045 | if (unlikely(!daddr || !saddr)) | |
1046 | return NULL; | |
1047 | ||
1048 | read_lock_bh(&xfrm_policy_lock); | |
1049 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
1050 | ret = NULL; | |
1051 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
1052 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1053 | if (err) { | |
1054 | if (err == -ESRCH) | |
1055 | continue; | |
1056 | else { | |
1057 | ret = ERR_PTR(err); | |
1058 | goto fail; | |
1059 | } | |
1060 | } else { | |
2518c7c2 | 1061 | ret = pol; |
acba48e1 | 1062 | priority = ret->priority; |
2518c7c2 DM |
1063 | break; |
1064 | } | |
1065 | } | |
acba48e1 DM |
1066 | chain = &xfrm_policy_inexact[dir]; |
1067 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
1068 | err = xfrm_policy_match(pol, fl, type, family, dir); |
1069 | if (err) { | |
1070 | if (err == -ESRCH) | |
1071 | continue; | |
1072 | else { | |
1073 | ret = ERR_PTR(err); | |
1074 | goto fail; | |
1075 | } | |
1076 | } else if (pol->priority < priority) { | |
acba48e1 DM |
1077 | ret = pol; |
1078 | break; | |
1da177e4 LT |
1079 | } |
1080 | } | |
acba48e1 DM |
1081 | if (ret) |
1082 | xfrm_pol_hold(ret); | |
134b0fc5 | 1083 | fail: |
1da177e4 | 1084 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 1085 | |
2518c7c2 | 1086 | return ret; |
4e81bb83 MN |
1087 | } |
1088 | ||
134b0fc5 | 1089 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
1090 | void **objp, atomic_t **obj_refp) |
1091 | { | |
1092 | struct xfrm_policy *pol; | |
134b0fc5 | 1093 | int err = 0; |
4e81bb83 MN |
1094 | |
1095 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1096 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
1097 | if (IS_ERR(pol)) { |
1098 | err = PTR_ERR(pol); | |
1099 | pol = NULL; | |
1100 | } | |
1101 | if (pol || err) | |
4e81bb83 MN |
1102 | goto end; |
1103 | #endif | |
1104 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
1105 | if (IS_ERR(pol)) { |
1106 | err = PTR_ERR(pol); | |
1107 | pol = NULL; | |
1108 | } | |
4e81bb83 | 1109 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1110 | end: |
4e81bb83 | 1111 | #endif |
1da177e4 LT |
1112 | if ((*objp = (void *) pol) != NULL) |
1113 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1114 | return err; |
1da177e4 LT |
1115 | } |
1116 | ||
df71837d TJ |
1117 | static inline int policy_to_flow_dir(int dir) |
1118 | { | |
1119 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1120 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1121 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1122 | return dir; | |
1123 | switch (dir) { | |
1124 | default: | |
1125 | case XFRM_POLICY_IN: | |
1126 | return FLOW_DIR_IN; | |
1127 | case XFRM_POLICY_OUT: | |
1128 | return FLOW_DIR_OUT; | |
1129 | case XFRM_POLICY_FWD: | |
1130 | return FLOW_DIR_FWD; | |
3ff50b79 | 1131 | } |
df71837d TJ |
1132 | } |
1133 | ||
e0d1caa7 | 1134 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1135 | { |
1136 | struct xfrm_policy *pol; | |
1137 | ||
1138 | read_lock_bh(&xfrm_policy_lock); | |
1139 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1140 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1141 | sk->sk_family); |
a716c119 | 1142 | int err = 0; |
df71837d | 1143 | |
3bccfbc7 VY |
1144 | if (match) { |
1145 | err = security_xfrm_policy_lookup(pol, fl->secid, | |
1146 | policy_to_flow_dir(dir)); | |
1147 | if (!err) | |
1148 | xfrm_pol_hold(pol); | |
1149 | else if (err == -ESRCH) | |
1150 | pol = NULL; | |
1151 | else | |
1152 | pol = ERR_PTR(err); | |
1153 | } else | |
1da177e4 LT |
1154 | pol = NULL; |
1155 | } | |
1156 | read_unlock_bh(&xfrm_policy_lock); | |
1157 | return pol; | |
1158 | } | |
1159 | ||
1160 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1161 | { | |
2518c7c2 DM |
1162 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1163 | pol->family, dir); | |
4e81bb83 | 1164 | |
2518c7c2 DM |
1165 | hlist_add_head(&pol->bydst, chain); |
1166 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1167 | xfrm_policy_count[dir]++; | |
1da177e4 | 1168 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1169 | |
1170 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1171 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1175 | int dir) | |
1176 | { | |
2518c7c2 DM |
1177 | if (hlist_unhashed(&pol->bydst)) |
1178 | return NULL; | |
1da177e4 | 1179 | |
2518c7c2 DM |
1180 | hlist_del(&pol->bydst); |
1181 | hlist_del(&pol->byidx); | |
1182 | xfrm_policy_count[dir]--; | |
1183 | ||
1184 | return pol; | |
1da177e4 LT |
1185 | } |
1186 | ||
4666faab | 1187 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1188 | { |
1189 | write_lock_bh(&xfrm_policy_lock); | |
1190 | pol = __xfrm_policy_unlink(pol, dir); | |
1191 | write_unlock_bh(&xfrm_policy_lock); | |
1192 | if (pol) { | |
1193 | if (dir < XFRM_POLICY_MAX) | |
1194 | atomic_inc(&flow_cache_genid); | |
1195 | xfrm_policy_kill(pol); | |
4666faab | 1196 | return 0; |
1da177e4 | 1197 | } |
4666faab | 1198 | return -ENOENT; |
1da177e4 | 1199 | } |
a70fcb0b | 1200 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1201 | |
1202 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1203 | { | |
1204 | struct xfrm_policy *old_pol; | |
1205 | ||
4e81bb83 MN |
1206 | #ifdef CONFIG_XFRM_SUB_POLICY |
1207 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1208 | return -EINVAL; | |
1209 | #endif | |
1210 | ||
1da177e4 LT |
1211 | write_lock_bh(&xfrm_policy_lock); |
1212 | old_pol = sk->sk_policy[dir]; | |
1213 | sk->sk_policy[dir] = pol; | |
1214 | if (pol) { | |
9d729f72 | 1215 | pol->curlft.add_time = get_seconds(); |
4e81bb83 | 1216 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1217 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1218 | } | |
1219 | if (old_pol) | |
1220 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1221 | write_unlock_bh(&xfrm_policy_lock); | |
1222 | ||
1223 | if (old_pol) { | |
1224 | xfrm_policy_kill(old_pol); | |
1225 | } | |
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1230 | { | |
1231 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1232 | ||
1233 | if (newp) { | |
1234 | newp->selector = old->selector; | |
df71837d TJ |
1235 | if (security_xfrm_policy_clone(old, newp)) { |
1236 | kfree(newp); | |
1237 | return NULL; /* ENOMEM */ | |
1238 | } | |
1da177e4 LT |
1239 | newp->lft = old->lft; |
1240 | newp->curlft = old->curlft; | |
1241 | newp->action = old->action; | |
1242 | newp->flags = old->flags; | |
1243 | newp->xfrm_nr = old->xfrm_nr; | |
1244 | newp->index = old->index; | |
4e81bb83 | 1245 | newp->type = old->type; |
1da177e4 LT |
1246 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1247 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1248 | write_lock_bh(&xfrm_policy_lock); | |
1249 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1250 | write_unlock_bh(&xfrm_policy_lock); | |
1251 | xfrm_pol_put(newp); | |
1252 | } | |
1253 | return newp; | |
1254 | } | |
1255 | ||
1256 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1257 | { | |
1258 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1259 | *p1 = sk->sk_policy[1]; | |
1260 | ||
1261 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1262 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1263 | return -ENOMEM; | |
1264 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1265 | return -ENOMEM; | |
1266 | return 0; | |
1267 | } | |
1268 | ||
a1e59abf PM |
1269 | static int |
1270 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1271 | unsigned short family) | |
1272 | { | |
1273 | int err; | |
1274 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1275 | ||
1276 | if (unlikely(afinfo == NULL)) | |
1277 | return -EINVAL; | |
1278 | err = afinfo->get_saddr(local, remote); | |
1279 | xfrm_policy_put_afinfo(afinfo); | |
1280 | return err; | |
1281 | } | |
1282 | ||
1da177e4 LT |
1283 | /* Resolve list of templates for the flow, given policy. */ |
1284 | ||
1285 | static int | |
4e81bb83 MN |
1286 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1287 | struct xfrm_state **xfrm, | |
1288 | unsigned short family) | |
1da177e4 LT |
1289 | { |
1290 | int nx; | |
1291 | int i, error; | |
1292 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1293 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1294 | xfrm_address_t tmp; |
1da177e4 LT |
1295 | |
1296 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1297 | struct xfrm_state *x; | |
1298 | xfrm_address_t *remote = daddr; | |
1299 | xfrm_address_t *local = saddr; | |
1300 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1301 | ||
7e49e6de | 1302 | if (tmpl->mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
1303 | remote = &tmpl->id.daddr; |
1304 | local = &tmpl->saddr; | |
76b3f055 | 1305 | family = tmpl->encap_family; |
a1e59abf PM |
1306 | if (xfrm_addr_any(local, family)) { |
1307 | error = xfrm_get_saddr(&tmp, remote, family); | |
1308 | if (error) | |
1309 | goto fail; | |
1310 | local = &tmp; | |
1311 | } | |
1da177e4 LT |
1312 | } |
1313 | ||
1314 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1315 | ||
1316 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1317 | xfrm[nx++] = x; | |
1318 | daddr = remote; | |
1319 | saddr = local; | |
1320 | continue; | |
1321 | } | |
1322 | if (x) { | |
1323 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1324 | -EINVAL : -EAGAIN); | |
1325 | xfrm_state_put(x); | |
1326 | } | |
1327 | ||
1328 | if (!tmpl->optional) | |
1329 | goto fail; | |
1330 | } | |
1331 | return nx; | |
1332 | ||
1333 | fail: | |
1334 | for (nx--; nx>=0; nx--) | |
1335 | xfrm_state_put(xfrm[nx]); | |
1336 | return error; | |
1337 | } | |
1338 | ||
4e81bb83 MN |
1339 | static int |
1340 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1341 | struct xfrm_state **xfrm, | |
1342 | unsigned short family) | |
1343 | { | |
41a49cc3 MN |
1344 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1345 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1346 | int cnx = 0; |
1347 | int error; | |
1348 | int ret; | |
1349 | int i; | |
1350 | ||
1351 | for (i = 0; i < npols; i++) { | |
1352 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1353 | error = -ENOBUFS; | |
1354 | goto fail; | |
1355 | } | |
41a49cc3 MN |
1356 | |
1357 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1358 | if (ret < 0) { |
1359 | error = ret; | |
1360 | goto fail; | |
1361 | } else | |
1362 | cnx += ret; | |
1363 | } | |
1364 | ||
41a49cc3 MN |
1365 | /* found states are sorted for outbound processing */ |
1366 | if (npols > 1) | |
1367 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1368 | ||
4e81bb83 MN |
1369 | return cnx; |
1370 | ||
1371 | fail: | |
1372 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1373 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1374 | return error; |
1375 | ||
1376 | } | |
1377 | ||
1da177e4 LT |
1378 | /* Check that the bundle accepts the flow and its components are |
1379 | * still valid. | |
1380 | */ | |
1381 | ||
1382 | static struct dst_entry * | |
1383 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1384 | { | |
1385 | struct dst_entry *x; | |
1386 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1387 | if (unlikely(afinfo == NULL)) | |
1388 | return ERR_PTR(-EINVAL); | |
1389 | x = afinfo->find_bundle(fl, policy); | |
1390 | xfrm_policy_put_afinfo(afinfo); | |
1391 | return x; | |
1392 | } | |
1393 | ||
1394 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate | |
1395 | * all the metrics... Shortly, bundle a bundle. | |
1396 | */ | |
1397 | ||
1398 | static int | |
1399 | xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, | |
1400 | struct flowi *fl, struct dst_entry **dst_p, | |
1401 | unsigned short family) | |
1402 | { | |
1403 | int err; | |
1404 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1405 | if (unlikely(afinfo == NULL)) | |
1406 | return -EINVAL; | |
1407 | err = afinfo->bundle_create(policy, xfrm, nx, fl, dst_p); | |
1408 | xfrm_policy_put_afinfo(afinfo); | |
1409 | return err; | |
1410 | } | |
1411 | ||
157bfc25 MN |
1412 | static int inline |
1413 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1414 | { | |
1415 | if (!*target) { | |
1416 | *target = kmalloc(size, GFP_ATOMIC); | |
1417 | if (!*target) | |
1418 | return -ENOMEM; | |
1419 | } | |
1420 | memcpy(*target, src, size); | |
1421 | return 0; | |
1422 | } | |
1423 | ||
1424 | static int inline | |
1425 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1426 | { | |
1427 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1428 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1429 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1430 | sel, sizeof(*sel)); | |
1431 | #else | |
1432 | return 0; | |
1433 | #endif | |
1434 | } | |
1435 | ||
1436 | static int inline | |
1437 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1438 | { | |
1439 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1440 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1441 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1442 | #else | |
1443 | return 0; | |
1444 | #endif | |
1445 | } | |
1da177e4 LT |
1446 | |
1447 | static int stale_bundle(struct dst_entry *dst); | |
1448 | ||
1449 | /* Main function: finds/creates a bundle for given flow. | |
1450 | * | |
1451 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1452 | * on interfaces with disabled IPsec. | |
1453 | */ | |
14e50e57 DM |
1454 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
1455 | struct sock *sk, int flags) | |
1da177e4 LT |
1456 | { |
1457 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1458 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1459 | int npols; | |
1460 | int pol_dead; | |
1461 | int xfrm_nr; | |
1462 | int pi; | |
1da177e4 LT |
1463 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1464 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1465 | int nx = 0; | |
1466 | int err; | |
1467 | u32 genid; | |
42cf93cd | 1468 | u16 family; |
df71837d | 1469 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1470 | |
1da177e4 LT |
1471 | restart: |
1472 | genid = atomic_read(&flow_cache_genid); | |
1473 | policy = NULL; | |
4e81bb83 MN |
1474 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1475 | pols[pi] = NULL; | |
1476 | npols = 0; | |
1477 | pol_dead = 0; | |
1478 | xfrm_nr = 0; | |
1479 | ||
3bccfbc7 | 1480 | if (sk && sk->sk_policy[1]) { |
e0d1caa7 | 1481 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
3bccfbc7 VY |
1482 | if (IS_ERR(policy)) |
1483 | return PTR_ERR(policy); | |
1484 | } | |
1da177e4 LT |
1485 | |
1486 | if (!policy) { | |
1487 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1488 | if ((dst_orig->flags & DST_NOXFRM) || |
1489 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
1da177e4 LT |
1490 | return 0; |
1491 | ||
e0d1caa7 | 1492 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1493 | dir, xfrm_policy_lookup); |
134b0fc5 JM |
1494 | if (IS_ERR(policy)) |
1495 | return PTR_ERR(policy); | |
1da177e4 LT |
1496 | } |
1497 | ||
1498 | if (!policy) | |
1499 | return 0; | |
1500 | ||
42cf93cd | 1501 | family = dst_orig->ops->family; |
9d729f72 | 1502 | policy->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1503 | pols[0] = policy; |
1504 | npols ++; | |
1505 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 LT |
1506 | |
1507 | switch (policy->action) { | |
1508 | case XFRM_POLICY_BLOCK: | |
1509 | /* Prohibit the flow */ | |
e104411b PM |
1510 | err = -EPERM; |
1511 | goto error; | |
1da177e4 LT |
1512 | |
1513 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1514 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1515 | if (policy->xfrm_nr == 0) { |
1516 | /* Flow passes not transformed. */ | |
1517 | xfrm_pol_put(policy); | |
1518 | return 0; | |
1519 | } | |
4e81bb83 | 1520 | #endif |
1da177e4 LT |
1521 | |
1522 | /* Try to find matching bundle. | |
1523 | * | |
1524 | * LATER: help from flow cache. It is optional, this | |
1525 | * is required only for output policy. | |
1526 | */ | |
1527 | dst = xfrm_find_bundle(fl, policy, family); | |
1528 | if (IS_ERR(dst)) { | |
e104411b PM |
1529 | err = PTR_ERR(dst); |
1530 | goto error; | |
1da177e4 LT |
1531 | } |
1532 | ||
1533 | if (dst) | |
1534 | break; | |
1535 | ||
4e81bb83 MN |
1536 | #ifdef CONFIG_XFRM_SUB_POLICY |
1537 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1538 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1539 | fl, family, | |
1540 | XFRM_POLICY_OUT); | |
1541 | if (pols[1]) { | |
134b0fc5 JM |
1542 | if (IS_ERR(pols[1])) { |
1543 | err = PTR_ERR(pols[1]); | |
1544 | goto error; | |
1545 | } | |
4e81bb83 MN |
1546 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
1547 | err = -EPERM; | |
1548 | goto error; | |
1549 | } | |
1550 | npols ++; | |
1551 | xfrm_nr += pols[1]->xfrm_nr; | |
1552 | } | |
1553 | } | |
1554 | ||
1555 | /* | |
1556 | * Because neither flowi nor bundle information knows about | |
1557 | * transformation template size. On more than one policy usage | |
1558 | * we can realize whether all of them is bypass or not after | |
1559 | * they are searched. See above not-transformed bypass | |
1560 | * is surrounded by non-sub policy configuration, too. | |
1561 | */ | |
1562 | if (xfrm_nr == 0) { | |
1563 | /* Flow passes not transformed. */ | |
1564 | xfrm_pols_put(pols, npols); | |
1565 | return 0; | |
1566 | } | |
1567 | ||
1568 | #endif | |
1569 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1570 | |
1571 | if (unlikely(nx<0)) { | |
1572 | err = nx; | |
14e50e57 DM |
1573 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1574 | /* EREMOTE tells the caller to generate | |
1575 | * a one-shot blackhole route. | |
1576 | */ | |
1577 | xfrm_pol_put(policy); | |
1578 | return -EREMOTE; | |
1579 | } | |
1da177e4 LT |
1580 | if (err == -EAGAIN && flags) { |
1581 | DECLARE_WAITQUEUE(wait, current); | |
1582 | ||
1583 | add_wait_queue(&km_waitq, &wait); | |
1584 | set_current_state(TASK_INTERRUPTIBLE); | |
1585 | schedule(); | |
1586 | set_current_state(TASK_RUNNING); | |
1587 | remove_wait_queue(&km_waitq, &wait); | |
1588 | ||
4e81bb83 | 1589 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1590 | |
1591 | if (nx == -EAGAIN && signal_pending(current)) { | |
1592 | err = -ERESTART; | |
1593 | goto error; | |
1594 | } | |
1595 | if (nx == -EAGAIN || | |
1596 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1597 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1598 | goto restart; |
1599 | } | |
1600 | err = nx; | |
1601 | } | |
1602 | if (err < 0) | |
1603 | goto error; | |
1604 | } | |
1605 | if (nx == 0) { | |
1606 | /* Flow passes not transformed. */ | |
4e81bb83 | 1607 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1608 | return 0; |
1609 | } | |
1610 | ||
1611 | dst = dst_orig; | |
1612 | err = xfrm_bundle_create(policy, xfrm, nx, fl, &dst, family); | |
1613 | ||
1614 | if (unlikely(err)) { | |
1615 | int i; | |
1616 | for (i=0; i<nx; i++) | |
1617 | xfrm_state_put(xfrm[i]); | |
1618 | goto error; | |
1619 | } | |
1620 | ||
4e81bb83 MN |
1621 | for (pi = 0; pi < npols; pi++) { |
1622 | read_lock_bh(&pols[pi]->lock); | |
1623 | pol_dead |= pols[pi]->dead; | |
1624 | read_unlock_bh(&pols[pi]->lock); | |
1625 | } | |
1626 | ||
1da177e4 | 1627 | write_lock_bh(&policy->lock); |
4e81bb83 | 1628 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1629 | /* Wow! While we worked on resolving, this |
1630 | * policy has gone. Retry. It is not paranoia, | |
1631 | * we just cannot enlist new bundle to dead object. | |
1632 | * We can't enlist stable bundles either. | |
1633 | */ | |
1634 | write_unlock_bh(&policy->lock); | |
1da177e4 LT |
1635 | if (dst) |
1636 | dst_free(dst); | |
00de651d HX |
1637 | |
1638 | err = -EHOSTUNREACH; | |
1639 | goto error; | |
1da177e4 | 1640 | } |
157bfc25 MN |
1641 | |
1642 | if (npols > 1) | |
1643 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1644 | else | |
1645 | err = xfrm_dst_update_origin(dst, fl); | |
1646 | if (unlikely(err)) { | |
1647 | write_unlock_bh(&policy->lock); | |
1648 | if (dst) | |
1649 | dst_free(dst); | |
1650 | goto error; | |
1651 | } | |
1652 | ||
1da177e4 LT |
1653 | dst->next = policy->bundles; |
1654 | policy->bundles = dst; | |
1655 | dst_hold(dst); | |
1656 | write_unlock_bh(&policy->lock); | |
1657 | } | |
1658 | *dst_p = dst; | |
1659 | dst_release(dst_orig); | |
a716c119 | 1660 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1661 | return 0; |
1662 | ||
1663 | error: | |
1664 | dst_release(dst_orig); | |
4e81bb83 | 1665 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1666 | *dst_p = NULL; |
1667 | return err; | |
1668 | } | |
14e50e57 DM |
1669 | EXPORT_SYMBOL(__xfrm_lookup); |
1670 | ||
1671 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1672 | struct sock *sk, int flags) | |
1673 | { | |
1674 | int err = __xfrm_lookup(dst_p, fl, sk, flags); | |
1675 | ||
1676 | if (err == -EREMOTE) { | |
1677 | dst_release(*dst_p); | |
1678 | *dst_p = NULL; | |
1679 | err = -EAGAIN; | |
1680 | } | |
1681 | ||
1682 | return err; | |
1683 | } | |
1da177e4 LT |
1684 | EXPORT_SYMBOL(xfrm_lookup); |
1685 | ||
df0ba92a MN |
1686 | static inline int |
1687 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1688 | { | |
1689 | struct xfrm_state *x; | |
1690 | int err; | |
1691 | ||
1692 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1693 | return 0; | |
1694 | x = skb->sp->xvec[idx]; | |
1695 | if (!x->type->reject) | |
1696 | return 0; | |
1697 | xfrm_state_hold(x); | |
1698 | err = x->type->reject(x, skb, fl); | |
1699 | xfrm_state_put(x); | |
1700 | return err; | |
1701 | } | |
1702 | ||
1da177e4 LT |
1703 | /* When skb is transformed back to its "native" form, we have to |
1704 | * check policy restrictions. At the moment we make this in maximally | |
1705 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1706 | * have policy cached at them. | |
1707 | */ | |
1708 | ||
1709 | static inline int | |
a716c119 | 1710 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1711 | unsigned short family) |
1712 | { | |
1713 | if (xfrm_state_kern(x)) | |
928ba416 | 1714 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1715 | return x->id.proto == tmpl->id.proto && |
1716 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1717 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1718 | x->props.mode == tmpl->mode && | |
f3bd4840 MN |
1719 | ((tmpl->aalgos & (1<<x->props.aalgo)) || |
1720 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && | |
7e49e6de MN |
1721 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1722 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1723 | } |
1724 | ||
df0ba92a MN |
1725 | /* |
1726 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1727 | * because of optional transport mode, or next index of the mathced secpath | |
1728 | * state with the template. | |
1729 | * -1 is returned when no matching template is found. | |
1730 | * Otherwise "-2 - errored_index" is returned. | |
1731 | */ | |
1da177e4 LT |
1732 | static inline int |
1733 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1734 | unsigned short family) | |
1735 | { | |
1736 | int idx = start; | |
1737 | ||
1738 | if (tmpl->optional) { | |
7e49e6de | 1739 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1740 | return start; |
1741 | } else | |
1742 | start = -1; | |
1743 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1744 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1745 | return ++idx; |
df0ba92a MN |
1746 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1747 | if (start == -1) | |
1748 | start = -2-idx; | |
1da177e4 | 1749 | break; |
df0ba92a | 1750 | } |
1da177e4 LT |
1751 | } |
1752 | return start; | |
1753 | } | |
1754 | ||
3e3850e9 PM |
1755 | int |
1756 | xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family) | |
1da177e4 LT |
1757 | { |
1758 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1759 | int err; |
1da177e4 LT |
1760 | |
1761 | if (unlikely(afinfo == NULL)) | |
1762 | return -EAFNOSUPPORT; | |
1763 | ||
1764 | afinfo->decode_session(skb, fl); | |
beb8d13b | 1765 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1766 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1767 | return err; |
1da177e4 | 1768 | } |
3e3850e9 | 1769 | EXPORT_SYMBOL(xfrm_decode_session); |
1da177e4 | 1770 | |
df0ba92a | 1771 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1772 | { |
1773 | for (; k < sp->len; k++) { | |
df0ba92a | 1774 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1775 | *idxp = k; |
1da177e4 | 1776 | return 1; |
df0ba92a | 1777 | } |
1da177e4 LT |
1778 | } |
1779 | ||
1780 | return 0; | |
1781 | } | |
1782 | ||
a716c119 | 1783 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1784 | unsigned short family) |
1785 | { | |
1786 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1787 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1788 | int npols = 0; | |
1789 | int xfrm_nr; | |
1790 | int pi; | |
1da177e4 | 1791 | struct flowi fl; |
df71837d | 1792 | u8 fl_dir = policy_to_flow_dir(dir); |
df0ba92a | 1793 | int xerr_idx = -1; |
1da177e4 | 1794 | |
3e3850e9 | 1795 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 | 1796 | return 0; |
eb9c7ebe | 1797 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1798 | |
1799 | /* First, check used SA against their selectors. */ | |
1800 | if (skb->sp) { | |
1801 | int i; | |
1802 | ||
1803 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa HX |
1804 | struct xfrm_state *x = skb->sp->xvec[i]; |
1805 | if (!xfrm_selector_match(&x->sel, &fl, family)) | |
1da177e4 | 1806 | return 0; |
1da177e4 LT |
1807 | } |
1808 | } | |
1809 | ||
1810 | pol = NULL; | |
3bccfbc7 | 1811 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1812 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
3bccfbc7 VY |
1813 | if (IS_ERR(pol)) |
1814 | return 0; | |
1815 | } | |
1da177e4 LT |
1816 | |
1817 | if (!pol) | |
e0d1caa7 | 1818 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1819 | xfrm_policy_lookup); |
1820 | ||
134b0fc5 JM |
1821 | if (IS_ERR(pol)) |
1822 | return 0; | |
1823 | ||
df0ba92a | 1824 | if (!pol) { |
d1d9facf | 1825 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a MN |
1826 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
1827 | return 0; | |
1828 | } | |
1829 | return 1; | |
1830 | } | |
1da177e4 | 1831 | |
9d729f72 | 1832 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1833 | |
4e81bb83 MN |
1834 | pols[0] = pol; |
1835 | npols ++; | |
1836 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1837 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1838 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1839 | &fl, family, | |
1840 | XFRM_POLICY_IN); | |
1841 | if (pols[1]) { | |
134b0fc5 JM |
1842 | if (IS_ERR(pols[1])) |
1843 | return 0; | |
9d729f72 | 1844 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1845 | npols ++; |
1846 | } | |
1847 | } | |
1848 | #endif | |
1849 | ||
1da177e4 LT |
1850 | if (pol->action == XFRM_POLICY_ALLOW) { |
1851 | struct sec_path *sp; | |
1852 | static struct sec_path dummy; | |
4e81bb83 | 1853 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1854 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1855 | struct xfrm_tmpl **tpp = tp; |
1856 | int ti = 0; | |
1da177e4 LT |
1857 | int i, k; |
1858 | ||
1859 | if ((sp = skb->sp) == NULL) | |
1860 | sp = &dummy; | |
1861 | ||
4e81bb83 MN |
1862 | for (pi = 0; pi < npols; pi++) { |
1863 | if (pols[pi] != pol && | |
1864 | pols[pi]->action != XFRM_POLICY_ALLOW) | |
1865 | goto reject; | |
1866 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) | |
1867 | goto reject_error; | |
1868 | for (i = 0; i < pols[pi]->xfrm_nr; i++) | |
1869 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1870 | } | |
1871 | xfrm_nr = ti; | |
41a49cc3 MN |
1872 | if (npols > 1) { |
1873 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
1874 | tpp = stp; | |
1875 | } | |
4e81bb83 | 1876 | |
1da177e4 LT |
1877 | /* For each tunnel xfrm, find the first matching tmpl. |
1878 | * For each tmpl before that, find corresponding xfrm. | |
1879 | * Order is _important_. Later we will implement | |
1880 | * some barriers, but at the moment barriers | |
1881 | * are implied between each two transformations. | |
1882 | */ | |
4e81bb83 MN |
1883 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
1884 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 1885 | if (k < 0) { |
d1d9facf JM |
1886 | if (k < -1) |
1887 | /* "-2 - errored_index" returned */ | |
1888 | xerr_idx = -(2+k); | |
1da177e4 | 1889 | goto reject; |
df0ba92a | 1890 | } |
1da177e4 LT |
1891 | } |
1892 | ||
d1d9facf | 1893 | if (secpath_has_nontransport(sp, k, &xerr_idx)) |
1da177e4 LT |
1894 | goto reject; |
1895 | ||
4e81bb83 | 1896 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1897 | return 1; |
1898 | } | |
1899 | ||
1900 | reject: | |
df0ba92a | 1901 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
1902 | reject_error: |
1903 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
1904 | return 0; |
1905 | } | |
1906 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1907 | ||
1908 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1909 | { | |
1910 | struct flowi fl; | |
1911 | ||
3e3850e9 | 1912 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 LT |
1913 | return 0; |
1914 | ||
1915 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1916 | } | |
1917 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1918 | ||
d49c73c7 DM |
1919 | /* Optimize later using cookies and generation ids. */ |
1920 | ||
1da177e4 LT |
1921 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1922 | { | |
d49c73c7 DM |
1923 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
1924 | * to "-1" to force all XFRM destinations to get validated by | |
1925 | * dst_ops->check on every use. We do this because when a | |
1926 | * normal route referenced by an XFRM dst is obsoleted we do | |
1927 | * not go looking around for all parent referencing XFRM dsts | |
1928 | * so that we can invalidate them. It is just too much work. | |
1929 | * Instead we make the checks here on every use. For example: | |
1930 | * | |
1931 | * XFRM dst A --> IPv4 dst X | |
1932 | * | |
1933 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
1934 | * in this example). If X is marked obsolete, "A" will not | |
1935 | * notice. That's what we are validating here via the | |
1936 | * stale_bundle() check. | |
1937 | * | |
1938 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
1939 | * dst which causes it's ->obsolete field to be set to a | |
1940 | * positive non-zero integer. If an XFRM dst has been pruned | |
1941 | * like this, we want to force a new route lookup. | |
399c180a | 1942 | */ |
d49c73c7 DM |
1943 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
1944 | return dst; | |
1945 | ||
1da177e4 LT |
1946 | return NULL; |
1947 | } | |
1948 | ||
1949 | static int stale_bundle(struct dst_entry *dst) | |
1950 | { | |
5b368e61 | 1951 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
1952 | } |
1953 | ||
aabc9761 | 1954 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 1955 | { |
1da177e4 LT |
1956 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
1957 | dst->dev = &loopback_dev; | |
1958 | dev_hold(&loopback_dev); | |
1959 | dev_put(dev); | |
1960 | } | |
1961 | } | |
aabc9761 | 1962 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
1963 | |
1964 | static void xfrm_link_failure(struct sk_buff *skb) | |
1965 | { | |
1966 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1967 | return; | |
1968 | } | |
1969 | ||
1970 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
1971 | { | |
1972 | if (dst) { | |
1973 | if (dst->obsolete) { | |
1974 | dst_release(dst); | |
1975 | dst = NULL; | |
1976 | } | |
1977 | } | |
1978 | return dst; | |
1979 | } | |
1980 | ||
2518c7c2 DM |
1981 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
1982 | { | |
1983 | struct dst_entry *dst, **dstp; | |
1984 | ||
1985 | write_lock(&pol->lock); | |
1986 | dstp = &pol->bundles; | |
1987 | while ((dst=*dstp) != NULL) { | |
1988 | if (func(dst)) { | |
1989 | *dstp = dst->next; | |
1990 | dst->next = *gc_list_p; | |
1991 | *gc_list_p = dst; | |
1992 | } else { | |
1993 | dstp = &dst->next; | |
1994 | } | |
1995 | } | |
1996 | write_unlock(&pol->lock); | |
1997 | } | |
1998 | ||
1da177e4 LT |
1999 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
2000 | { | |
2518c7c2 DM |
2001 | struct dst_entry *gc_list = NULL; |
2002 | int dir; | |
1da177e4 LT |
2003 | |
2004 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2005 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2006 | struct xfrm_policy *pol; | |
2007 | struct hlist_node *entry; | |
2008 | struct hlist_head *table; | |
2009 | int i; | |
4e81bb83 | 2010 | |
2518c7c2 DM |
2011 | hlist_for_each_entry(pol, entry, |
2012 | &xfrm_policy_inexact[dir], bydst) | |
2013 | prune_one_bundle(pol, func, &gc_list); | |
2014 | ||
2015 | table = xfrm_policy_bydst[dir].table; | |
2016 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
2017 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
2018 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2019 | } |
2020 | } | |
2021 | read_unlock_bh(&xfrm_policy_lock); | |
2022 | ||
2023 | while (gc_list) { | |
2518c7c2 | 2024 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2025 | gc_list = dst->next; |
2026 | dst_free(dst); | |
2027 | } | |
2028 | } | |
2029 | ||
2030 | static int unused_bundle(struct dst_entry *dst) | |
2031 | { | |
2032 | return !atomic_read(&dst->__refcnt); | |
2033 | } | |
2034 | ||
2035 | static void __xfrm_garbage_collect(void) | |
2036 | { | |
2037 | xfrm_prune_bundles(unused_bundle); | |
2038 | } | |
2039 | ||
1c095399 | 2040 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
2041 | { |
2042 | xfrm_prune_bundles(stale_bundle); | |
2043 | return 0; | |
2044 | } | |
2045 | ||
2046 | void xfrm_init_pmtu(struct dst_entry *dst) | |
2047 | { | |
2048 | do { | |
2049 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2050 | u32 pmtu, route_mtu_cached; | |
2051 | ||
2052 | pmtu = dst_mtu(dst->child); | |
2053 | xdst->child_mtu_cached = pmtu; | |
2054 | ||
2055 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2056 | ||
2057 | route_mtu_cached = dst_mtu(xdst->route); | |
2058 | xdst->route_mtu_cached = route_mtu_cached; | |
2059 | ||
2060 | if (pmtu > route_mtu_cached) | |
2061 | pmtu = route_mtu_cached; | |
2062 | ||
2063 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2064 | } while ((dst = dst->next)); | |
2065 | } | |
2066 | ||
2067 | EXPORT_SYMBOL(xfrm_init_pmtu); | |
2068 | ||
2069 | /* Check that the bundle accepts the flow and its components are | |
2070 | * still valid. | |
2071 | */ | |
2072 | ||
5b368e61 VY |
2073 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2074 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2075 | { |
2076 | struct dst_entry *dst = &first->u.dst; | |
2077 | struct xfrm_dst *last; | |
2078 | u32 mtu; | |
2079 | ||
92d63dec | 2080 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2081 | (dst->dev && !netif_running(dst->dev))) |
2082 | return 0; | |
157bfc25 MN |
2083 | #ifdef CONFIG_XFRM_SUB_POLICY |
2084 | if (fl) { | |
2085 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2086 | return 0; | |
2087 | if (first->partner && | |
2088 | !xfrm_selector_match(first->partner, fl, family)) | |
2089 | return 0; | |
2090 | } | |
2091 | #endif | |
1da177e4 LT |
2092 | |
2093 | last = NULL; | |
2094 | ||
2095 | do { | |
2096 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2097 | ||
2098 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2099 | return 0; | |
67f83cbf VY |
2100 | if (fl && pol && |
2101 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2102 | return 0; |
1da177e4 LT |
2103 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2104 | return 0; | |
9d4a706d DM |
2105 | if (xdst->genid != dst->xfrm->genid) |
2106 | return 0; | |
e53820de MN |
2107 | |
2108 | if (strict && fl && dst->xfrm->props.mode != XFRM_MODE_TUNNEL && | |
2109 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) | |
2110 | return 0; | |
1da177e4 LT |
2111 | |
2112 | mtu = dst_mtu(dst->child); | |
2113 | if (xdst->child_mtu_cached != mtu) { | |
2114 | last = xdst; | |
2115 | xdst->child_mtu_cached = mtu; | |
2116 | } | |
2117 | ||
92d63dec | 2118 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2119 | return 0; |
2120 | mtu = dst_mtu(xdst->route); | |
2121 | if (xdst->route_mtu_cached != mtu) { | |
2122 | last = xdst; | |
2123 | xdst->route_mtu_cached = mtu; | |
2124 | } | |
2125 | ||
2126 | dst = dst->child; | |
2127 | } while (dst->xfrm); | |
2128 | ||
2129 | if (likely(!last)) | |
2130 | return 1; | |
2131 | ||
2132 | mtu = last->child_mtu_cached; | |
2133 | for (;;) { | |
2134 | dst = &last->u.dst; | |
2135 | ||
2136 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2137 | if (mtu > last->route_mtu_cached) | |
2138 | mtu = last->route_mtu_cached; | |
2139 | dst->metrics[RTAX_MTU-1] = mtu; | |
2140 | ||
2141 | if (last == first) | |
2142 | break; | |
2143 | ||
bd0bf076 | 2144 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2145 | last->child_mtu_cached = mtu; |
2146 | } | |
2147 | ||
2148 | return 1; | |
2149 | } | |
2150 | ||
2151 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2152 | ||
c9204d9c | 2153 | #ifdef CONFIG_AUDITSYSCALL |
161a09e7 JL |
2154 | /* Audit addition and deletion of SAs and ipsec policy */ |
2155 | ||
2156 | void xfrm_audit_log(uid_t auid, u32 sid, int type, int result, | |
2157 | struct xfrm_policy *xp, struct xfrm_state *x) | |
2158 | { | |
2159 | ||
2160 | char *secctx; | |
2161 | u32 secctx_len; | |
2162 | struct xfrm_sec_ctx *sctx = NULL; | |
2163 | struct audit_buffer *audit_buf; | |
2164 | int family; | |
2165 | extern int audit_enabled; | |
2166 | ||
2167 | if (audit_enabled == 0) | |
2168 | return; | |
2169 | ||
13fcfbb0 DM |
2170 | BUG_ON((type == AUDIT_MAC_IPSEC_ADDSA || |
2171 | type == AUDIT_MAC_IPSEC_DELSA) && !x); | |
2172 | BUG_ON((type == AUDIT_MAC_IPSEC_ADDSPD || | |
2173 | type == AUDIT_MAC_IPSEC_DELSPD) && !xp); | |
2174 | ||
161a09e7 JL |
2175 | audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type); |
2176 | if (audit_buf == NULL) | |
13fcfbb0 | 2177 | return; |
161a09e7 JL |
2178 | |
2179 | switch(type) { | |
2180 | case AUDIT_MAC_IPSEC_ADDSA: | |
2181 | audit_log_format(audit_buf, "SAD add: auid=%u", auid); | |
2182 | break; | |
2183 | case AUDIT_MAC_IPSEC_DELSA: | |
2184 | audit_log_format(audit_buf, "SAD delete: auid=%u", auid); | |
2185 | break; | |
2186 | case AUDIT_MAC_IPSEC_ADDSPD: | |
2187 | audit_log_format(audit_buf, "SPD add: auid=%u", auid); | |
2188 | break; | |
2189 | case AUDIT_MAC_IPSEC_DELSPD: | |
2190 | audit_log_format(audit_buf, "SPD delete: auid=%u", auid); | |
2191 | break; | |
2192 | default: | |
2193 | return; | |
2194 | } | |
2195 | ||
2196 | if (sid != 0 && | |
2197 | security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) | |
2198 | audit_log_format(audit_buf, " subj=%s", secctx); | |
2199 | else | |
2200 | audit_log_task_context(audit_buf); | |
2201 | ||
2202 | if (xp) { | |
2203 | family = xp->selector.family; | |
2204 | if (xp->security) | |
2205 | sctx = xp->security; | |
2206 | } else { | |
2207 | family = x->props.family; | |
2208 | if (x->security) | |
2209 | sctx = x->security; | |
2210 | } | |
2211 | ||
2212 | if (sctx) | |
2213 | audit_log_format(audit_buf, | |
2214 | " sec_alg=%u sec_doi=%u sec_obj=%s", | |
2215 | sctx->ctx_alg, sctx->ctx_doi, sctx->ctx_str); | |
2216 | ||
2217 | switch(family) { | |
2218 | case AF_INET: | |
2219 | { | |
2220 | struct in_addr saddr, daddr; | |
2221 | if (xp) { | |
2222 | saddr.s_addr = xp->selector.saddr.a4; | |
2223 | daddr.s_addr = xp->selector.daddr.a4; | |
2224 | } else { | |
2225 | saddr.s_addr = x->props.saddr.a4; | |
2226 | daddr.s_addr = x->id.daddr.a4; | |
2227 | } | |
2228 | audit_log_format(audit_buf, | |
2229 | " src=%u.%u.%u.%u dst=%u.%u.%u.%u", | |
2230 | NIPQUAD(saddr), NIPQUAD(daddr)); | |
2231 | } | |
2232 | break; | |
2233 | case AF_INET6: | |
2234 | { | |
2235 | struct in6_addr saddr6, daddr6; | |
2236 | if (xp) { | |
2237 | memcpy(&saddr6, xp->selector.saddr.a6, | |
2238 | sizeof(struct in6_addr)); | |
2239 | memcpy(&daddr6, xp->selector.daddr.a6, | |
2240 | sizeof(struct in6_addr)); | |
2241 | } else { | |
2242 | memcpy(&saddr6, x->props.saddr.a6, | |
2243 | sizeof(struct in6_addr)); | |
2244 | memcpy(&daddr6, x->id.daddr.a6, | |
2245 | sizeof(struct in6_addr)); | |
2246 | } | |
2247 | audit_log_format(audit_buf, | |
96199558 | 2248 | " src=" NIP6_FMT " dst=" NIP6_FMT, |
161a09e7 JL |
2249 | NIP6(saddr6), NIP6(daddr6)); |
2250 | } | |
2251 | break; | |
2252 | } | |
2253 | ||
2254 | if (x) | |
2255 | audit_log_format(audit_buf, " spi=%lu(0x%lx) protocol=%s", | |
2256 | (unsigned long)ntohl(x->id.spi), | |
2257 | (unsigned long)ntohl(x->id.spi), | |
2258 | x->id.proto == IPPROTO_AH ? "AH" : | |
2259 | (x->id.proto == IPPROTO_ESP ? | |
2260 | "ESP" : "IPCOMP")); | |
2261 | ||
2262 | audit_log_format(audit_buf, " res=%u", result); | |
2263 | audit_log_end(audit_buf); | |
2264 | } | |
2265 | ||
2266 | EXPORT_SYMBOL(xfrm_audit_log); | |
c9204d9c | 2267 | #endif /* CONFIG_AUDITSYSCALL */ |
161a09e7 | 2268 | |
1da177e4 LT |
2269 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2270 | { | |
2271 | int err = 0; | |
2272 | if (unlikely(afinfo == NULL)) | |
2273 | return -EINVAL; | |
2274 | if (unlikely(afinfo->family >= NPROTO)) | |
2275 | return -EAFNOSUPPORT; | |
e959d812 | 2276 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2277 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2278 | err = -ENOBUFS; | |
2279 | else { | |
2280 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2281 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2282 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2283 | if (likely(dst_ops->check == NULL)) | |
2284 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2285 | if (likely(dst_ops->negative_advice == NULL)) |
2286 | dst_ops->negative_advice = xfrm_negative_advice; | |
2287 | if (likely(dst_ops->link_failure == NULL)) | |
2288 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2289 | if (likely(afinfo->garbage_collect == NULL)) |
2290 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2291 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2292 | } | |
e959d812 | 2293 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2294 | return err; |
2295 | } | |
2296 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2297 | ||
2298 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2299 | { | |
2300 | int err = 0; | |
2301 | if (unlikely(afinfo == NULL)) | |
2302 | return -EINVAL; | |
2303 | if (unlikely(afinfo->family >= NPROTO)) | |
2304 | return -EAFNOSUPPORT; | |
e959d812 | 2305 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2306 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2307 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2308 | err = -EINVAL; | |
2309 | else { | |
2310 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2311 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2312 | dst_ops->kmem_cachep = NULL; | |
2313 | dst_ops->check = NULL; | |
1da177e4 LT |
2314 | dst_ops->negative_advice = NULL; |
2315 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2316 | afinfo->garbage_collect = NULL; |
2317 | } | |
2318 | } | |
e959d812 | 2319 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2320 | return err; |
2321 | } | |
2322 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2323 | ||
2324 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2325 | { | |
2326 | struct xfrm_policy_afinfo *afinfo; | |
2327 | if (unlikely(family >= NPROTO)) | |
2328 | return NULL; | |
2329 | read_lock(&xfrm_policy_afinfo_lock); | |
2330 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2331 | if (unlikely(!afinfo)) |
2332 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2333 | return afinfo; |
2334 | } | |
2335 | ||
2336 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2337 | { | |
546be240 HX |
2338 | read_unlock(&xfrm_policy_afinfo_lock); |
2339 | } | |
2340 | ||
2341 | static struct xfrm_policy_afinfo *xfrm_policy_lock_afinfo(unsigned int family) | |
2342 | { | |
2343 | struct xfrm_policy_afinfo *afinfo; | |
2344 | if (unlikely(family >= NPROTO)) | |
2345 | return NULL; | |
2346 | write_lock_bh(&xfrm_policy_afinfo_lock); | |
2347 | afinfo = xfrm_policy_afinfo[family]; | |
2348 | if (unlikely(!afinfo)) | |
2349 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
2350 | return afinfo; | |
2351 | } | |
2352 | ||
2353 | static void xfrm_policy_unlock_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2354 | { | |
2355 | write_unlock_bh(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2356 | } |
2357 | ||
2358 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
2359 | { | |
2360 | switch (event) { | |
2361 | case NETDEV_DOWN: | |
2362 | xfrm_flush_bundles(); | |
2363 | } | |
2364 | return NOTIFY_DONE; | |
2365 | } | |
2366 | ||
2367 | static struct notifier_block xfrm_dev_notifier = { | |
2368 | xfrm_dev_event, | |
2369 | NULL, | |
2370 | 0 | |
2371 | }; | |
2372 | ||
2373 | static void __init xfrm_policy_init(void) | |
2374 | { | |
2518c7c2 DM |
2375 | unsigned int hmask, sz; |
2376 | int dir; | |
2377 | ||
1da177e4 LT |
2378 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2379 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2380 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2381 | NULL); |
1da177e4 | 2382 | |
2518c7c2 DM |
2383 | hmask = 8 - 1; |
2384 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2385 | ||
44e36b42 | 2386 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2387 | xfrm_idx_hmask = hmask; |
2388 | if (!xfrm_policy_byidx) | |
2389 | panic("XFRM: failed to allocate byidx hash\n"); | |
2390 | ||
2391 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2392 | struct xfrm_policy_hash *htab; | |
2393 | ||
2394 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2395 | ||
2396 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2397 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2398 | htab->hmask = hmask; |
2399 | if (!htab->table) | |
2400 | panic("XFRM: failed to allocate bydst hash\n"); | |
2401 | } | |
2402 | ||
c4028958 | 2403 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2404 | register_netdevice_notifier(&xfrm_dev_notifier); |
2405 | } | |
2406 | ||
2407 | void __init xfrm_init(void) | |
2408 | { | |
2409 | xfrm_state_init(); | |
2410 | xfrm_policy_init(); | |
2411 | xfrm_input_init(); | |
2412 | } | |
2413 | ||
80c9abaa SS |
2414 | #ifdef CONFIG_XFRM_MIGRATE |
2415 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2416 | struct xfrm_selector *sel_tgt) | |
2417 | { | |
2418 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2419 | if (sel_tgt->family == sel_cmp->family && | |
2420 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2421 | sel_cmp->family) == 0 && |
80c9abaa SS |
2422 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2423 | sel_cmp->family) == 0 && | |
2424 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2425 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2426 | return 1; | |
2427 | } | |
2428 | } else { | |
2429 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2430 | return 1; | |
2431 | } | |
2432 | } | |
2433 | return 0; | |
2434 | } | |
2435 | ||
2436 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2437 | u8 dir, u8 type) | |
2438 | { | |
2439 | struct xfrm_policy *pol, *ret = NULL; | |
2440 | struct hlist_node *entry; | |
2441 | struct hlist_head *chain; | |
2442 | u32 priority = ~0U; | |
2443 | ||
2444 | read_lock_bh(&xfrm_policy_lock); | |
2445 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2446 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2447 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2448 | pol->type == type) { | |
2449 | ret = pol; | |
2450 | priority = ret->priority; | |
2451 | break; | |
2452 | } | |
2453 | } | |
2454 | chain = &xfrm_policy_inexact[dir]; | |
2455 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2456 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2457 | pol->type == type && | |
2458 | pol->priority < priority) { | |
2459 | ret = pol; | |
2460 | break; | |
2461 | } | |
2462 | } | |
2463 | ||
2464 | if (ret) | |
2465 | xfrm_pol_hold(ret); | |
2466 | ||
2467 | read_unlock_bh(&xfrm_policy_lock); | |
2468 | ||
2469 | return ret; | |
2470 | } | |
2471 | ||
2472 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2473 | { | |
2474 | int match = 0; | |
2475 | ||
2476 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2477 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2478 | switch (t->mode) { | |
2479 | case XFRM_MODE_TUNNEL: | |
2480 | case XFRM_MODE_BEET: | |
2481 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2482 | m->old_family) == 0 && | |
2483 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2484 | m->old_family) == 0) { | |
2485 | match = 1; | |
2486 | } | |
2487 | break; | |
2488 | case XFRM_MODE_TRANSPORT: | |
2489 | /* in case of transport mode, template does not store | |
2490 | any IP addresses, hence we just compare mode and | |
2491 | protocol */ | |
2492 | match = 1; | |
2493 | break; | |
2494 | default: | |
2495 | break; | |
2496 | } | |
2497 | } | |
2498 | return match; | |
2499 | } | |
2500 | ||
2501 | /* update endpoint address(es) of template(s) */ | |
2502 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2503 | struct xfrm_migrate *m, int num_migrate) | |
2504 | { | |
2505 | struct xfrm_migrate *mp; | |
2506 | struct dst_entry *dst; | |
2507 | int i, j, n = 0; | |
2508 | ||
2509 | write_lock_bh(&pol->lock); | |
2510 | if (unlikely(pol->dead)) { | |
2511 | /* target policy has been deleted */ | |
2512 | write_unlock_bh(&pol->lock); | |
2513 | return -ENOENT; | |
2514 | } | |
2515 | ||
2516 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2517 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2518 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2519 | continue; | |
2520 | n++; | |
2521 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL) | |
2522 | continue; | |
2523 | /* update endpoints */ | |
2524 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2525 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2526 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2527 | sizeof(pol->xfrm_vec[i].saddr)); | |
2528 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2529 | /* flush bundles */ | |
2530 | while ((dst = pol->bundles) != NULL) { | |
2531 | pol->bundles = dst->next; | |
2532 | dst_free(dst); | |
2533 | } | |
2534 | } | |
2535 | } | |
2536 | ||
2537 | write_unlock_bh(&pol->lock); | |
2538 | ||
2539 | if (!n) | |
2540 | return -ENODATA; | |
2541 | ||
2542 | return 0; | |
2543 | } | |
2544 | ||
2545 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2546 | { | |
2547 | int i, j; | |
2548 | ||
2549 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2550 | return -EINVAL; | |
2551 | ||
2552 | for (i = 0; i < num_migrate; i++) { | |
2553 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2554 | m[i].old_family) == 0) && | |
2555 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2556 | m[i].old_family) == 0)) | |
2557 | return -EINVAL; | |
2558 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2559 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2560 | return -EINVAL; | |
2561 | ||
2562 | /* check if there is any duplicated entry */ | |
2563 | for (j = i + 1; j < num_migrate; j++) { | |
2564 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2565 | sizeof(m[i].old_daddr)) && | |
2566 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2567 | sizeof(m[i].old_saddr)) && | |
2568 | m[i].proto == m[j].proto && | |
2569 | m[i].mode == m[j].mode && | |
2570 | m[i].reqid == m[j].reqid && | |
2571 | m[i].old_family == m[j].old_family) | |
2572 | return -EINVAL; | |
2573 | } | |
2574 | } | |
2575 | ||
2576 | return 0; | |
2577 | } | |
2578 | ||
2579 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
2580 | struct xfrm_migrate *m, int num_migrate) | |
2581 | { | |
2582 | int i, err, nx_cur = 0, nx_new = 0; | |
2583 | struct xfrm_policy *pol = NULL; | |
2584 | struct xfrm_state *x, *xc; | |
2585 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2586 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2587 | struct xfrm_migrate *mp; | |
2588 | ||
2589 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2590 | goto out; | |
2591 | ||
2592 | /* Stage 1 - find policy */ | |
2593 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2594 | err = -ENOENT; | |
2595 | goto out; | |
2596 | } | |
2597 | ||
2598 | /* Stage 2 - find and update state(s) */ | |
2599 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2600 | if ((x = xfrm_migrate_state_find(mp))) { | |
2601 | x_cur[nx_cur] = x; | |
2602 | nx_cur++; | |
2603 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2604 | x_new[nx_new] = xc; | |
2605 | nx_new++; | |
2606 | } else { | |
2607 | err = -ENODATA; | |
2608 | goto restore_state; | |
2609 | } | |
2610 | } | |
2611 | } | |
2612 | ||
2613 | /* Stage 3 - update policy */ | |
2614 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2615 | goto restore_state; | |
2616 | ||
2617 | /* Stage 4 - delete old state(s) */ | |
2618 | if (nx_cur) { | |
2619 | xfrm_states_put(x_cur, nx_cur); | |
2620 | xfrm_states_delete(x_cur, nx_cur); | |
2621 | } | |
2622 | ||
2623 | /* Stage 5 - announce */ | |
2624 | km_migrate(sel, dir, type, m, num_migrate); | |
2625 | ||
2626 | xfrm_pol_put(pol); | |
2627 | ||
2628 | return 0; | |
2629 | out: | |
2630 | return err; | |
2631 | ||
2632 | restore_state: | |
2633 | if (pol) | |
2634 | xfrm_pol_put(pol); | |
2635 | if (nx_cur) | |
2636 | xfrm_states_put(x_cur, nx_cur); | |
2637 | if (nx_new) | |
2638 | xfrm_states_delete(x_new, nx_new); | |
2639 | ||
2640 | return err; | |
2641 | } | |
e610e679 | 2642 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2643 | #endif |