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 | ||
66cdb3ca | 16 | #include <linux/err.h> |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/kmod.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/notifier.h> | |
23 | #include <linux/netdevice.h> | |
eb9c7ebe | 24 | #include <linux/netfilter.h> |
1da177e4 | 25 | #include <linux/module.h> |
2518c7c2 | 26 | #include <linux/cache.h> |
25ee3286 | 27 | #include <net/dst.h> |
1da177e4 LT |
28 | #include <net/xfrm.h> |
29 | #include <net/ip.h> | |
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); | |
25ee3286 | 54 | static void xfrm_init_pmtu(struct dst_entry *dst); |
1da177e4 | 55 | |
77681021 AM |
56 | static inline int |
57 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
58 | { | |
59 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
60 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
61 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
62 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
63 | (fl->proto == sel->proto || !sel->proto) && | |
64 | (fl->oif == sel->ifindex || !sel->ifindex); | |
65 | } | |
66 | ||
67 | static inline int | |
68 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
69 | { | |
70 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
71 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
72 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
73 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
74 | (fl->proto == sel->proto || !sel->proto) && | |
75 | (fl->oif == sel->ifindex || !sel->ifindex); | |
76 | } | |
77 | ||
78 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
79 | unsigned short family) | |
80 | { | |
81 | switch (family) { | |
82 | case AF_INET: | |
83 | return __xfrm4_selector_match(sel, fl); | |
84 | case AF_INET6: | |
85 | return __xfrm6_selector_match(sel, fl); | |
86 | } | |
87 | return 0; | |
88 | } | |
89 | ||
25ee3286 HX |
90 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
91 | int family) | |
1da177e4 | 92 | { |
66cdb3ca HX |
93 | xfrm_address_t *saddr = &x->props.saddr; |
94 | xfrm_address_t *daddr = &x->id.daddr; | |
95 | struct xfrm_policy_afinfo *afinfo; | |
96 | struct dst_entry *dst; | |
97 | ||
98 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) | |
99 | saddr = x->coaddr; | |
100 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) | |
101 | daddr = x->coaddr; | |
1da177e4 | 102 | |
25ee3286 | 103 | afinfo = xfrm_policy_get_afinfo(family); |
1da177e4 | 104 | if (unlikely(afinfo == NULL)) |
66cdb3ca | 105 | return ERR_PTR(-EAFNOSUPPORT); |
1da177e4 | 106 | |
66cdb3ca | 107 | dst = afinfo->dst_lookup(tos, saddr, daddr); |
1da177e4 | 108 | xfrm_policy_put_afinfo(afinfo); |
66cdb3ca | 109 | return dst; |
1da177e4 | 110 | } |
1da177e4 | 111 | |
1da177e4 LT |
112 | static inline unsigned long make_jiffies(long secs) |
113 | { | |
114 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
115 | return MAX_SCHEDULE_TIMEOUT-1; | |
116 | else | |
a716c119 | 117 | return secs*HZ; |
1da177e4 LT |
118 | } |
119 | ||
120 | static void xfrm_policy_timer(unsigned long data) | |
121 | { | |
122 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 123 | unsigned long now = get_seconds(); |
1da177e4 LT |
124 | long next = LONG_MAX; |
125 | int warn = 0; | |
126 | int dir; | |
127 | ||
128 | read_lock(&xp->lock); | |
129 | ||
130 | if (xp->dead) | |
131 | goto out; | |
132 | ||
77d8d7a6 | 133 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
134 | |
135 | if (xp->lft.hard_add_expires_seconds) { | |
136 | long tmo = xp->lft.hard_add_expires_seconds + | |
137 | xp->curlft.add_time - now; | |
138 | if (tmo <= 0) | |
139 | goto expired; | |
140 | if (tmo < next) | |
141 | next = tmo; | |
142 | } | |
143 | if (xp->lft.hard_use_expires_seconds) { | |
144 | long tmo = xp->lft.hard_use_expires_seconds + | |
145 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
146 | if (tmo <= 0) | |
147 | goto expired; | |
148 | if (tmo < next) | |
149 | next = tmo; | |
150 | } | |
151 | if (xp->lft.soft_add_expires_seconds) { | |
152 | long tmo = xp->lft.soft_add_expires_seconds + | |
153 | xp->curlft.add_time - now; | |
154 | if (tmo <= 0) { | |
155 | warn = 1; | |
156 | tmo = XFRM_KM_TIMEOUT; | |
157 | } | |
158 | if (tmo < next) | |
159 | next = tmo; | |
160 | } | |
161 | if (xp->lft.soft_use_expires_seconds) { | |
162 | long tmo = xp->lft.soft_use_expires_seconds + | |
163 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
164 | if (tmo <= 0) { | |
165 | warn = 1; | |
166 | tmo = XFRM_KM_TIMEOUT; | |
167 | } | |
168 | if (tmo < next) | |
169 | next = tmo; | |
170 | } | |
171 | ||
172 | if (warn) | |
6c5c8ca7 | 173 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
174 | if (next != LONG_MAX && |
175 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
176 | xfrm_pol_hold(xp); | |
177 | ||
178 | out: | |
179 | read_unlock(&xp->lock); | |
180 | xfrm_pol_put(xp); | |
181 | return; | |
182 | ||
183 | expired: | |
184 | read_unlock(&xp->lock); | |
4666faab | 185 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 186 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
187 | xfrm_pol_put(xp); |
188 | } | |
189 | ||
190 | ||
191 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
192 | * SPD calls. | |
193 | */ | |
194 | ||
dd0fc66f | 195 | struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp) |
1da177e4 LT |
196 | { |
197 | struct xfrm_policy *policy; | |
198 | ||
0da974f4 | 199 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
200 | |
201 | if (policy) { | |
2518c7c2 DM |
202 | INIT_HLIST_NODE(&policy->bydst); |
203 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 204 | rwlock_init(&policy->lock); |
2518c7c2 | 205 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
206 | setup_timer(&policy->timer, xfrm_policy_timer, |
207 | (unsigned long)policy); | |
1da177e4 LT |
208 | } |
209 | return policy; | |
210 | } | |
211 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
212 | ||
213 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
214 | ||
215 | void __xfrm_policy_destroy(struct xfrm_policy *policy) | |
216 | { | |
09a62660 | 217 | BUG_ON(!policy->dead); |
1da177e4 | 218 | |
09a62660 | 219 | BUG_ON(policy->bundles); |
1da177e4 LT |
220 | |
221 | if (del_timer(&policy->timer)) | |
222 | BUG(); | |
223 | ||
df71837d | 224 | security_xfrm_policy_free(policy); |
1da177e4 LT |
225 | kfree(policy); |
226 | } | |
227 | EXPORT_SYMBOL(__xfrm_policy_destroy); | |
228 | ||
229 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
230 | { | |
231 | struct dst_entry *dst; | |
232 | ||
233 | while ((dst = policy->bundles) != NULL) { | |
234 | policy->bundles = dst->next; | |
235 | dst_free(dst); | |
236 | } | |
237 | ||
238 | if (del_timer(&policy->timer)) | |
239 | atomic_dec(&policy->refcnt); | |
240 | ||
241 | if (atomic_read(&policy->refcnt) > 1) | |
242 | flow_cache_flush(); | |
243 | ||
244 | xfrm_pol_put(policy); | |
245 | } | |
246 | ||
c4028958 | 247 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
248 | { |
249 | struct xfrm_policy *policy; | |
2518c7c2 DM |
250 | struct hlist_node *entry, *tmp; |
251 | struct hlist_head gc_list; | |
1da177e4 LT |
252 | |
253 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
254 | gc_list.first = xfrm_policy_gc_list.first; |
255 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
256 | spin_unlock_bh(&xfrm_policy_gc_lock); |
257 | ||
2518c7c2 | 258 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 259 | xfrm_policy_gc_kill(policy); |
1da177e4 LT |
260 | } |
261 | ||
262 | /* Rule must be locked. Release descentant resources, announce | |
263 | * entry dead. The rule must be unlinked from lists to the moment. | |
264 | */ | |
265 | ||
266 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
267 | { | |
268 | int dead; | |
269 | ||
270 | write_lock_bh(&policy->lock); | |
271 | dead = policy->dead; | |
272 | policy->dead = 1; | |
273 | write_unlock_bh(&policy->lock); | |
274 | ||
275 | if (unlikely(dead)) { | |
276 | WARN_ON(1); | |
277 | return; | |
278 | } | |
279 | ||
280 | spin_lock(&xfrm_policy_gc_lock); | |
2518c7c2 | 281 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
1da177e4 LT |
282 | spin_unlock(&xfrm_policy_gc_lock); |
283 | ||
284 | schedule_work(&xfrm_policy_gc_work); | |
285 | } | |
286 | ||
2518c7c2 DM |
287 | struct xfrm_policy_hash { |
288 | struct hlist_head *table; | |
289 | unsigned int hmask; | |
290 | }; | |
291 | ||
292 | static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2]; | |
293 | static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly; | |
294 | static struct hlist_head *xfrm_policy_byidx __read_mostly; | |
295 | static unsigned int xfrm_idx_hmask __read_mostly; | |
296 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; | |
297 | ||
2518c7c2 DM |
298 | static inline unsigned int idx_hash(u32 index) |
299 | { | |
300 | return __idx_hash(index, xfrm_idx_hmask); | |
301 | } | |
302 | ||
2518c7c2 DM |
303 | static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir) |
304 | { | |
305 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
306 | unsigned int hash = __sel_hash(sel, family, hmask); | |
307 | ||
308 | return (hash == hmask + 1 ? | |
309 | &xfrm_policy_inexact[dir] : | |
310 | xfrm_policy_bydst[dir].table + hash); | |
311 | } | |
312 | ||
313 | static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) | |
314 | { | |
315 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
316 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); | |
317 | ||
318 | return xfrm_policy_bydst[dir].table + hash; | |
319 | } | |
320 | ||
2518c7c2 DM |
321 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
322 | struct hlist_head *ndsttable, | |
323 | unsigned int nhashmask) | |
324 | { | |
325 | struct hlist_node *entry, *tmp; | |
326 | struct xfrm_policy *pol; | |
327 | ||
328 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { | |
329 | unsigned int h; | |
330 | ||
331 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
332 | pol->family, nhashmask); | |
333 | hlist_add_head(&pol->bydst, ndsttable+h); | |
334 | } | |
335 | } | |
336 | ||
337 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
338 | struct hlist_head *nidxtable, | |
339 | unsigned int nhashmask) | |
340 | { | |
341 | struct hlist_node *entry, *tmp; | |
342 | struct xfrm_policy *pol; | |
343 | ||
344 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
345 | unsigned int h; | |
346 | ||
347 | h = __idx_hash(pol->index, nhashmask); | |
348 | hlist_add_head(&pol->byidx, nidxtable+h); | |
349 | } | |
350 | } | |
351 | ||
352 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
353 | { | |
354 | return ((old_hmask + 1) << 1) - 1; | |
355 | } | |
356 | ||
357 | static void xfrm_bydst_resize(int dir) | |
358 | { | |
359 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
360 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
361 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
362 | struct hlist_head *odst = xfrm_policy_bydst[dir].table; | |
44e36b42 | 363 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
364 | int i; |
365 | ||
366 | if (!ndst) | |
367 | return; | |
368 | ||
369 | write_lock_bh(&xfrm_policy_lock); | |
370 | ||
371 | for (i = hmask; i >= 0; i--) | |
372 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
373 | ||
374 | xfrm_policy_bydst[dir].table = ndst; | |
375 | xfrm_policy_bydst[dir].hmask = nhashmask; | |
376 | ||
377 | write_unlock_bh(&xfrm_policy_lock); | |
378 | ||
44e36b42 | 379 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
380 | } |
381 | ||
382 | static void xfrm_byidx_resize(int total) | |
383 | { | |
384 | unsigned int hmask = xfrm_idx_hmask; | |
385 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); | |
386 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
387 | struct hlist_head *oidx = xfrm_policy_byidx; | |
44e36b42 | 388 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
389 | int i; |
390 | ||
391 | if (!nidx) | |
392 | return; | |
393 | ||
394 | write_lock_bh(&xfrm_policy_lock); | |
395 | ||
396 | for (i = hmask; i >= 0; i--) | |
397 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
398 | ||
399 | xfrm_policy_byidx = nidx; | |
400 | xfrm_idx_hmask = nhashmask; | |
401 | ||
402 | write_unlock_bh(&xfrm_policy_lock); | |
403 | ||
44e36b42 | 404 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
405 | } |
406 | ||
407 | static inline int xfrm_bydst_should_resize(int dir, int *total) | |
408 | { | |
409 | unsigned int cnt = xfrm_policy_count[dir]; | |
410 | unsigned int hmask = xfrm_policy_bydst[dir].hmask; | |
411 | ||
412 | if (total) | |
413 | *total += cnt; | |
414 | ||
415 | if ((hmask + 1) < xfrm_policy_hashmax && | |
416 | cnt > hmask) | |
417 | return 1; | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
422 | static inline int xfrm_byidx_should_resize(int total) | |
423 | { | |
424 | unsigned int hmask = xfrm_idx_hmask; | |
425 | ||
426 | if ((hmask + 1) < xfrm_policy_hashmax && | |
427 | total > hmask) | |
428 | return 1; | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
5a6d3416 | 433 | void xfrm_spd_getinfo(struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
434 | { |
435 | read_lock_bh(&xfrm_policy_lock); | |
436 | si->incnt = xfrm_policy_count[XFRM_POLICY_IN]; | |
437 | si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT]; | |
438 | si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD]; | |
439 | si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
440 | si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
441 | si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
442 | si->spdhcnt = xfrm_idx_hmask; | |
443 | si->spdhmcnt = xfrm_policy_hashmax; | |
444 | read_unlock_bh(&xfrm_policy_lock); | |
445 | } | |
446 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 447 | |
ecfd6b18 | 448 | static DEFINE_MUTEX(hash_resize_mutex); |
c4028958 | 449 | static void xfrm_hash_resize(struct work_struct *__unused) |
2518c7c2 DM |
450 | { |
451 | int dir, total; | |
452 | ||
453 | mutex_lock(&hash_resize_mutex); | |
454 | ||
455 | total = 0; | |
456 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
457 | if (xfrm_bydst_should_resize(dir, &total)) | |
458 | xfrm_bydst_resize(dir); | |
459 | } | |
460 | if (xfrm_byidx_should_resize(total)) | |
461 | xfrm_byidx_resize(total); | |
462 | ||
463 | mutex_unlock(&hash_resize_mutex); | |
464 | } | |
465 | ||
c4028958 | 466 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
2518c7c2 | 467 | |
1da177e4 LT |
468 | /* Generate new index... KAME seems to generate them ordered by cost |
469 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
4e81bb83 | 470 | static u32 xfrm_gen_index(u8 type, int dir) |
1da177e4 | 471 | { |
1da177e4 LT |
472 | static u32 idx_generator; |
473 | ||
474 | for (;;) { | |
2518c7c2 DM |
475 | struct hlist_node *entry; |
476 | struct hlist_head *list; | |
477 | struct xfrm_policy *p; | |
478 | u32 idx; | |
479 | int found; | |
480 | ||
1da177e4 LT |
481 | idx = (idx_generator | dir); |
482 | idx_generator += 8; | |
483 | if (idx == 0) | |
484 | idx = 8; | |
2518c7c2 DM |
485 | list = xfrm_policy_byidx + idx_hash(idx); |
486 | found = 0; | |
487 | hlist_for_each_entry(p, entry, list, byidx) { | |
488 | if (p->index == idx) { | |
489 | found = 1; | |
1da177e4 | 490 | break; |
2518c7c2 | 491 | } |
1da177e4 | 492 | } |
2518c7c2 | 493 | if (!found) |
1da177e4 LT |
494 | return idx; |
495 | } | |
496 | } | |
497 | ||
2518c7c2 DM |
498 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
499 | { | |
500 | u32 *p1 = (u32 *) s1; | |
501 | u32 *p2 = (u32 *) s2; | |
502 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
503 | int i; | |
504 | ||
505 | for (i = 0; i < len; i++) { | |
506 | if (p1[i] != p2[i]) | |
507 | return 1; | |
508 | } | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
1da177e4 LT |
513 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
514 | { | |
2518c7c2 DM |
515 | struct xfrm_policy *pol; |
516 | struct xfrm_policy *delpol; | |
517 | struct hlist_head *chain; | |
a6c7ab55 | 518 | struct hlist_node *entry, *newpos; |
9b78a82c | 519 | struct dst_entry *gc_list; |
1da177e4 LT |
520 | |
521 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
522 | chain = policy_hash_bysel(&policy->selector, policy->family, dir); |
523 | delpol = NULL; | |
524 | newpos = NULL; | |
2518c7c2 | 525 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 526 | if (pol->type == policy->type && |
2518c7c2 | 527 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
528 | xfrm_sec_ctx_match(pol->security, policy->security) && |
529 | !WARN_ON(delpol)) { | |
1da177e4 LT |
530 | if (excl) { |
531 | write_unlock_bh(&xfrm_policy_lock); | |
532 | return -EEXIST; | |
533 | } | |
1da177e4 LT |
534 | delpol = pol; |
535 | if (policy->priority > pol->priority) | |
536 | continue; | |
537 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 538 | newpos = &pol->bydst; |
1da177e4 LT |
539 | continue; |
540 | } | |
1da177e4 LT |
541 | if (delpol) |
542 | break; | |
1da177e4 LT |
543 | } |
544 | if (newpos) | |
2518c7c2 DM |
545 | hlist_add_after(newpos, &policy->bydst); |
546 | else | |
547 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 548 | xfrm_pol_hold(policy); |
2518c7c2 | 549 | xfrm_policy_count[dir]++; |
1da177e4 | 550 | atomic_inc(&flow_cache_genid); |
2518c7c2 DM |
551 | if (delpol) { |
552 | hlist_del(&delpol->bydst); | |
553 | hlist_del(&delpol->byidx); | |
554 | xfrm_policy_count[dir]--; | |
555 | } | |
4e81bb83 | 556 | policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir); |
2518c7c2 | 557 | hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index)); |
9d729f72 | 558 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
559 | policy->curlft.use_time = 0; |
560 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
561 | xfrm_pol_hold(policy); | |
562 | write_unlock_bh(&xfrm_policy_lock); | |
563 | ||
9b78a82c | 564 | if (delpol) |
1da177e4 | 565 | xfrm_policy_kill(delpol); |
2518c7c2 DM |
566 | else if (xfrm_bydst_should_resize(dir, NULL)) |
567 | schedule_work(&xfrm_hash_work); | |
9b78a82c DM |
568 | |
569 | read_lock_bh(&xfrm_policy_lock); | |
570 | gc_list = NULL; | |
2518c7c2 DM |
571 | entry = &policy->bydst; |
572 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
573 | struct dst_entry *dst; |
574 | ||
575 | write_lock(&policy->lock); | |
576 | dst = policy->bundles; | |
577 | if (dst) { | |
578 | struct dst_entry *tail = dst; | |
579 | while (tail->next) | |
580 | tail = tail->next; | |
581 | tail->next = gc_list; | |
582 | gc_list = dst; | |
583 | ||
584 | policy->bundles = NULL; | |
585 | } | |
586 | write_unlock(&policy->lock); | |
1da177e4 | 587 | } |
9b78a82c DM |
588 | read_unlock_bh(&xfrm_policy_lock); |
589 | ||
590 | while (gc_list) { | |
591 | struct dst_entry *dst = gc_list; | |
592 | ||
593 | gc_list = dst->next; | |
594 | dst_free(dst); | |
595 | } | |
596 | ||
1da177e4 LT |
597 | return 0; |
598 | } | |
599 | EXPORT_SYMBOL(xfrm_policy_insert); | |
600 | ||
4e81bb83 MN |
601 | struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, |
602 | struct xfrm_selector *sel, | |
ef41aaa0 EP |
603 | struct xfrm_sec_ctx *ctx, int delete, |
604 | int *err) | |
1da177e4 | 605 | { |
2518c7c2 DM |
606 | struct xfrm_policy *pol, *ret; |
607 | struct hlist_head *chain; | |
608 | struct hlist_node *entry; | |
1da177e4 | 609 | |
ef41aaa0 | 610 | *err = 0; |
1da177e4 | 611 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
612 | chain = policy_hash_bysel(sel, sel->family, dir); |
613 | ret = NULL; | |
614 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
615 | if (pol->type == type && | |
616 | !selector_cmp(sel, &pol->selector) && | |
617 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 618 | xfrm_pol_hold(pol); |
2518c7c2 | 619 | if (delete) { |
ef41aaa0 EP |
620 | *err = security_xfrm_policy_delete(pol); |
621 | if (*err) { | |
622 | write_unlock_bh(&xfrm_policy_lock); | |
623 | return pol; | |
624 | } | |
2518c7c2 DM |
625 | hlist_del(&pol->bydst); |
626 | hlist_del(&pol->byidx); | |
627 | xfrm_policy_count[dir]--; | |
628 | } | |
629 | ret = pol; | |
1da177e4 LT |
630 | break; |
631 | } | |
632 | } | |
633 | write_unlock_bh(&xfrm_policy_lock); | |
634 | ||
2518c7c2 | 635 | if (ret && delete) { |
1da177e4 | 636 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 637 | xfrm_policy_kill(ret); |
1da177e4 | 638 | } |
2518c7c2 | 639 | return ret; |
1da177e4 | 640 | } |
df71837d | 641 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 642 | |
ef41aaa0 EP |
643 | struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, |
644 | int *err) | |
1da177e4 | 645 | { |
2518c7c2 DM |
646 | struct xfrm_policy *pol, *ret; |
647 | struct hlist_head *chain; | |
648 | struct hlist_node *entry; | |
1da177e4 | 649 | |
b5505c6e HX |
650 | *err = -ENOENT; |
651 | if (xfrm_policy_id2dir(id) != dir) | |
652 | return NULL; | |
653 | ||
ef41aaa0 | 654 | *err = 0; |
1da177e4 | 655 | write_lock_bh(&xfrm_policy_lock); |
2518c7c2 DM |
656 | chain = xfrm_policy_byidx + idx_hash(id); |
657 | ret = NULL; | |
658 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
659 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 660 | xfrm_pol_hold(pol); |
2518c7c2 | 661 | if (delete) { |
ef41aaa0 EP |
662 | *err = security_xfrm_policy_delete(pol); |
663 | if (*err) { | |
664 | write_unlock_bh(&xfrm_policy_lock); | |
665 | return pol; | |
666 | } | |
2518c7c2 DM |
667 | hlist_del(&pol->bydst); |
668 | hlist_del(&pol->byidx); | |
669 | xfrm_policy_count[dir]--; | |
670 | } | |
671 | ret = pol; | |
1da177e4 LT |
672 | break; |
673 | } | |
674 | } | |
675 | write_unlock_bh(&xfrm_policy_lock); | |
676 | ||
2518c7c2 | 677 | if (ret && delete) { |
1da177e4 | 678 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 679 | xfrm_policy_kill(ret); |
1da177e4 | 680 | } |
2518c7c2 | 681 | return ret; |
1da177e4 LT |
682 | } |
683 | EXPORT_SYMBOL(xfrm_policy_byid); | |
684 | ||
4aa2e62c JL |
685 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
686 | static inline int | |
687 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
1da177e4 | 688 | { |
4aa2e62c JL |
689 | int dir, err = 0; |
690 | ||
691 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
692 | struct xfrm_policy *pol; | |
693 | struct hlist_node *entry; | |
694 | int i; | |
695 | ||
696 | hlist_for_each_entry(pol, entry, | |
697 | &xfrm_policy_inexact[dir], bydst) { | |
698 | if (pol->type != type) | |
699 | continue; | |
700 | err = security_xfrm_policy_delete(pol); | |
701 | if (err) { | |
ab5f5e8b JL |
702 | xfrm_audit_policy_delete(pol, 0, |
703 | audit_info->loginuid, | |
704 | audit_info->secid); | |
4aa2e62c JL |
705 | return err; |
706 | } | |
7dc12d6d | 707 | } |
4aa2e62c JL |
708 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
709 | hlist_for_each_entry(pol, entry, | |
710 | xfrm_policy_bydst[dir].table + i, | |
711 | bydst) { | |
712 | if (pol->type != type) | |
713 | continue; | |
714 | err = security_xfrm_policy_delete(pol); | |
715 | if (err) { | |
ab5f5e8b JL |
716 | xfrm_audit_policy_delete(pol, 0, |
717 | audit_info->loginuid, | |
718 | audit_info->secid); | |
4aa2e62c JL |
719 | return err; |
720 | } | |
721 | } | |
722 | } | |
723 | } | |
724 | return err; | |
725 | } | |
726 | #else | |
727 | static inline int | |
728 | xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) | |
729 | { | |
730 | return 0; | |
731 | } | |
732 | #endif | |
733 | ||
734 | int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) | |
735 | { | |
736 | int dir, err = 0; | |
1da177e4 LT |
737 | |
738 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c JL |
739 | |
740 | err = xfrm_policy_flush_secctx_check(type, audit_info); | |
741 | if (err) | |
742 | goto out; | |
743 | ||
1da177e4 | 744 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
745 | struct xfrm_policy *pol; |
746 | struct hlist_node *entry; | |
ae8c0577 | 747 | int i, killed; |
2518c7c2 | 748 | |
ae8c0577 | 749 | killed = 0; |
2518c7c2 DM |
750 | again1: |
751 | hlist_for_each_entry(pol, entry, | |
752 | &xfrm_policy_inexact[dir], bydst) { | |
753 | if (pol->type != type) | |
754 | continue; | |
755 | hlist_del(&pol->bydst); | |
756 | hlist_del(&pol->byidx); | |
1da177e4 LT |
757 | write_unlock_bh(&xfrm_policy_lock); |
758 | ||
ab5f5e8b JL |
759 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
760 | audit_info->secid); | |
161a09e7 | 761 | |
2518c7c2 | 762 | xfrm_policy_kill(pol); |
ae8c0577 | 763 | killed++; |
1da177e4 LT |
764 | |
765 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
766 | goto again1; |
767 | } | |
768 | ||
769 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
770 | again2: | |
771 | hlist_for_each_entry(pol, entry, | |
772 | xfrm_policy_bydst[dir].table + i, | |
773 | bydst) { | |
774 | if (pol->type != type) | |
775 | continue; | |
776 | hlist_del(&pol->bydst); | |
777 | hlist_del(&pol->byidx); | |
778 | write_unlock_bh(&xfrm_policy_lock); | |
779 | ||
ab5f5e8b JL |
780 | xfrm_audit_policy_delete(pol, 1, |
781 | audit_info->loginuid, | |
782 | audit_info->secid); | |
2518c7c2 | 783 | xfrm_policy_kill(pol); |
ae8c0577 | 784 | killed++; |
2518c7c2 DM |
785 | |
786 | write_lock_bh(&xfrm_policy_lock); | |
787 | goto again2; | |
788 | } | |
1da177e4 | 789 | } |
2518c7c2 | 790 | |
ae8c0577 | 791 | xfrm_policy_count[dir] -= killed; |
1da177e4 LT |
792 | } |
793 | atomic_inc(&flow_cache_genid); | |
4aa2e62c | 794 | out: |
1da177e4 | 795 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 796 | return err; |
1da177e4 LT |
797 | } |
798 | EXPORT_SYMBOL(xfrm_policy_flush); | |
799 | ||
4e81bb83 | 800 | int xfrm_policy_walk(u8 type, int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
801 | void *data) |
802 | { | |
baf5d743 | 803 | struct xfrm_policy *pol, *last = NULL; |
2518c7c2 | 804 | struct hlist_node *entry; |
baf5d743 | 805 | int dir, last_dir = 0, count, error; |
1da177e4 LT |
806 | |
807 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 | 808 | count = 0; |
1da177e4 LT |
809 | |
810 | for (dir = 0; dir < 2*XFRM_POLICY_MAX; dir++) { | |
2518c7c2 DM |
811 | struct hlist_head *table = xfrm_policy_bydst[dir].table; |
812 | int i; | |
813 | ||
814 | hlist_for_each_entry(pol, entry, | |
815 | &xfrm_policy_inexact[dir], bydst) { | |
816 | if (pol->type != type) | |
817 | continue; | |
baf5d743 JHS |
818 | if (last) { |
819 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
820 | count, data); | |
821 | if (error) | |
822 | goto out; | |
823 | } | |
824 | last = pol; | |
825 | last_dir = dir; | |
826 | count++; | |
1da177e4 | 827 | } |
2518c7c2 DM |
828 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { |
829 | hlist_for_each_entry(pol, entry, table + i, bydst) { | |
830 | if (pol->type != type) | |
831 | continue; | |
baf5d743 JHS |
832 | if (last) { |
833 | error = func(last, last_dir % XFRM_POLICY_MAX, | |
834 | count, data); | |
835 | if (error) | |
836 | goto out; | |
837 | } | |
838 | last = pol; | |
839 | last_dir = dir; | |
840 | count++; | |
2518c7c2 DM |
841 | } |
842 | } | |
1da177e4 | 843 | } |
baf5d743 JHS |
844 | if (count == 0) { |
845 | error = -ENOENT; | |
846 | goto out; | |
847 | } | |
848 | error = func(last, last_dir % XFRM_POLICY_MAX, 0, data); | |
1da177e4 LT |
849 | out: |
850 | read_unlock_bh(&xfrm_policy_lock); | |
851 | return error; | |
852 | } | |
853 | EXPORT_SYMBOL(xfrm_policy_walk); | |
854 | ||
134b0fc5 JM |
855 | /* |
856 | * Find policy to apply to this flow. | |
857 | * | |
858 | * Returns 0 if policy found, else an -errno. | |
859 | */ | |
2518c7c2 DM |
860 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
861 | u8 type, u16 family, int dir) | |
1da177e4 | 862 | { |
2518c7c2 | 863 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 864 | int match, ret = -ESRCH; |
1da177e4 | 865 | |
2518c7c2 DM |
866 | if (pol->family != family || |
867 | pol->type != type) | |
134b0fc5 | 868 | return ret; |
1da177e4 | 869 | |
2518c7c2 | 870 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 JM |
871 | if (match) |
872 | ret = security_xfrm_policy_lookup(pol, fl->secid, dir); | |
2518c7c2 | 873 | |
134b0fc5 | 874 | return ret; |
2518c7c2 | 875 | } |
1da177e4 | 876 | |
2518c7c2 DM |
877 | static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl, |
878 | u16 family, u8 dir) | |
879 | { | |
134b0fc5 | 880 | int err; |
2518c7c2 DM |
881 | struct xfrm_policy *pol, *ret; |
882 | xfrm_address_t *daddr, *saddr; | |
883 | struct hlist_node *entry; | |
884 | struct hlist_head *chain; | |
acba48e1 | 885 | u32 priority = ~0U; |
df71837d | 886 | |
2518c7c2 DM |
887 | daddr = xfrm_flowi_daddr(fl, family); |
888 | saddr = xfrm_flowi_saddr(fl, family); | |
889 | if (unlikely(!daddr || !saddr)) | |
890 | return NULL; | |
891 | ||
892 | read_lock_bh(&xfrm_policy_lock); | |
893 | chain = policy_hash_direct(daddr, saddr, family, dir); | |
894 | ret = NULL; | |
895 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
896 | err = xfrm_policy_match(pol, fl, type, family, dir); |
897 | if (err) { | |
898 | if (err == -ESRCH) | |
899 | continue; | |
900 | else { | |
901 | ret = ERR_PTR(err); | |
902 | goto fail; | |
903 | } | |
904 | } else { | |
2518c7c2 | 905 | ret = pol; |
acba48e1 | 906 | priority = ret->priority; |
2518c7c2 DM |
907 | break; |
908 | } | |
909 | } | |
acba48e1 DM |
910 | chain = &xfrm_policy_inexact[dir]; |
911 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
912 | err = xfrm_policy_match(pol, fl, type, family, dir); |
913 | if (err) { | |
914 | if (err == -ESRCH) | |
915 | continue; | |
916 | else { | |
917 | ret = ERR_PTR(err); | |
918 | goto fail; | |
919 | } | |
920 | } else if (pol->priority < priority) { | |
acba48e1 DM |
921 | ret = pol; |
922 | break; | |
1da177e4 LT |
923 | } |
924 | } | |
acba48e1 DM |
925 | if (ret) |
926 | xfrm_pol_hold(ret); | |
134b0fc5 | 927 | fail: |
1da177e4 | 928 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 929 | |
2518c7c2 | 930 | return ret; |
4e81bb83 MN |
931 | } |
932 | ||
134b0fc5 | 933 | static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir, |
4e81bb83 MN |
934 | void **objp, atomic_t **obj_refp) |
935 | { | |
936 | struct xfrm_policy *pol; | |
134b0fc5 | 937 | int err = 0; |
4e81bb83 MN |
938 | |
939 | #ifdef CONFIG_XFRM_SUB_POLICY | |
940 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
134b0fc5 JM |
941 | if (IS_ERR(pol)) { |
942 | err = PTR_ERR(pol); | |
943 | pol = NULL; | |
944 | } | |
945 | if (pol || err) | |
4e81bb83 MN |
946 | goto end; |
947 | #endif | |
948 | pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
134b0fc5 JM |
949 | if (IS_ERR(pol)) { |
950 | err = PTR_ERR(pol); | |
951 | pol = NULL; | |
952 | } | |
4e81bb83 | 953 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 954 | end: |
4e81bb83 | 955 | #endif |
1da177e4 LT |
956 | if ((*objp = (void *) pol) != NULL) |
957 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 958 | return err; |
1da177e4 LT |
959 | } |
960 | ||
df71837d TJ |
961 | static inline int policy_to_flow_dir(int dir) |
962 | { | |
963 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
964 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
965 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
966 | return dir; | |
967 | switch (dir) { | |
968 | default: | |
969 | case XFRM_POLICY_IN: | |
970 | return FLOW_DIR_IN; | |
971 | case XFRM_POLICY_OUT: | |
972 | return FLOW_DIR_OUT; | |
973 | case XFRM_POLICY_FWD: | |
974 | return FLOW_DIR_FWD; | |
3ff50b79 | 975 | } |
df71837d TJ |
976 | } |
977 | ||
e0d1caa7 | 978 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
979 | { |
980 | struct xfrm_policy *pol; | |
981 | ||
982 | read_lock_bh(&xfrm_policy_lock); | |
983 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 984 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 985 | sk->sk_family); |
a716c119 | 986 | int err = 0; |
df71837d | 987 | |
3bccfbc7 VY |
988 | if (match) { |
989 | err = security_xfrm_policy_lookup(pol, fl->secid, | |
990 | policy_to_flow_dir(dir)); | |
991 | if (!err) | |
992 | xfrm_pol_hold(pol); | |
993 | else if (err == -ESRCH) | |
994 | pol = NULL; | |
995 | else | |
996 | pol = ERR_PTR(err); | |
997 | } else | |
1da177e4 LT |
998 | pol = NULL; |
999 | } | |
1000 | read_unlock_bh(&xfrm_policy_lock); | |
1001 | return pol; | |
1002 | } | |
1003 | ||
1004 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1005 | { | |
2518c7c2 DM |
1006 | struct hlist_head *chain = policy_hash_bysel(&pol->selector, |
1007 | pol->family, dir); | |
4e81bb83 | 1008 | |
2518c7c2 DM |
1009 | hlist_add_head(&pol->bydst, chain); |
1010 | hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index)); | |
1011 | xfrm_policy_count[dir]++; | |
1da177e4 | 1012 | xfrm_pol_hold(pol); |
2518c7c2 DM |
1013 | |
1014 | if (xfrm_bydst_should_resize(dir, NULL)) | |
1015 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
1016 | } |
1017 | ||
1018 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1019 | int dir) | |
1020 | { | |
2518c7c2 DM |
1021 | if (hlist_unhashed(&pol->bydst)) |
1022 | return NULL; | |
1da177e4 | 1023 | |
2518c7c2 DM |
1024 | hlist_del(&pol->bydst); |
1025 | hlist_del(&pol->byidx); | |
1026 | xfrm_policy_count[dir]--; | |
1027 | ||
1028 | return pol; | |
1da177e4 LT |
1029 | } |
1030 | ||
4666faab | 1031 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1032 | { |
1033 | write_lock_bh(&xfrm_policy_lock); | |
1034 | pol = __xfrm_policy_unlink(pol, dir); | |
1035 | write_unlock_bh(&xfrm_policy_lock); | |
1036 | if (pol) { | |
1037 | if (dir < XFRM_POLICY_MAX) | |
1038 | atomic_inc(&flow_cache_genid); | |
1039 | xfrm_policy_kill(pol); | |
4666faab | 1040 | return 0; |
1da177e4 | 1041 | } |
4666faab | 1042 | return -ENOENT; |
1da177e4 | 1043 | } |
a70fcb0b | 1044 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1045 | |
1046 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1047 | { | |
1048 | struct xfrm_policy *old_pol; | |
1049 | ||
4e81bb83 MN |
1050 | #ifdef CONFIG_XFRM_SUB_POLICY |
1051 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1052 | return -EINVAL; | |
1053 | #endif | |
1054 | ||
1da177e4 LT |
1055 | write_lock_bh(&xfrm_policy_lock); |
1056 | old_pol = sk->sk_policy[dir]; | |
1057 | sk->sk_policy[dir] = pol; | |
1058 | if (pol) { | |
9d729f72 | 1059 | pol->curlft.add_time = get_seconds(); |
4e81bb83 | 1060 | pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1061 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1062 | } | |
1063 | if (old_pol) | |
1064 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1065 | write_unlock_bh(&xfrm_policy_lock); | |
1066 | ||
1067 | if (old_pol) { | |
1068 | xfrm_policy_kill(old_pol); | |
1069 | } | |
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1074 | { | |
1075 | struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC); | |
1076 | ||
1077 | if (newp) { | |
1078 | newp->selector = old->selector; | |
df71837d TJ |
1079 | if (security_xfrm_policy_clone(old, newp)) { |
1080 | kfree(newp); | |
1081 | return NULL; /* ENOMEM */ | |
1082 | } | |
1da177e4 LT |
1083 | newp->lft = old->lft; |
1084 | newp->curlft = old->curlft; | |
1085 | newp->action = old->action; | |
1086 | newp->flags = old->flags; | |
1087 | newp->xfrm_nr = old->xfrm_nr; | |
1088 | newp->index = old->index; | |
4e81bb83 | 1089 | newp->type = old->type; |
1da177e4 LT |
1090 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1091 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1092 | write_lock_bh(&xfrm_policy_lock); | |
1093 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1094 | write_unlock_bh(&xfrm_policy_lock); | |
1095 | xfrm_pol_put(newp); | |
1096 | } | |
1097 | return newp; | |
1098 | } | |
1099 | ||
1100 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1101 | { | |
1102 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1103 | *p1 = sk->sk_policy[1]; | |
1104 | ||
1105 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1106 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1107 | return -ENOMEM; | |
1108 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1109 | return -ENOMEM; | |
1110 | return 0; | |
1111 | } | |
1112 | ||
a1e59abf PM |
1113 | static int |
1114 | xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote, | |
1115 | unsigned short family) | |
1116 | { | |
1117 | int err; | |
1118 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1119 | ||
1120 | if (unlikely(afinfo == NULL)) | |
1121 | return -EINVAL; | |
1122 | err = afinfo->get_saddr(local, remote); | |
1123 | xfrm_policy_put_afinfo(afinfo); | |
1124 | return err; | |
1125 | } | |
1126 | ||
1da177e4 LT |
1127 | /* Resolve list of templates for the flow, given policy. */ |
1128 | ||
1129 | static int | |
4e81bb83 MN |
1130 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1131 | struct xfrm_state **xfrm, | |
1132 | unsigned short family) | |
1da177e4 LT |
1133 | { |
1134 | int nx; | |
1135 | int i, error; | |
1136 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1137 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1138 | xfrm_address_t tmp; |
1da177e4 LT |
1139 | |
1140 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1141 | struct xfrm_state *x; | |
1142 | xfrm_address_t *remote = daddr; | |
1143 | xfrm_address_t *local = saddr; | |
1144 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1145 | ||
48b8d783 JK |
1146 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1147 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1148 | remote = &tmpl->id.daddr; |
1149 | local = &tmpl->saddr; | |
76b3f055 | 1150 | family = tmpl->encap_family; |
a1e59abf PM |
1151 | if (xfrm_addr_any(local, family)) { |
1152 | error = xfrm_get_saddr(&tmp, remote, family); | |
1153 | if (error) | |
1154 | goto fail; | |
1155 | local = &tmp; | |
1156 | } | |
1da177e4 LT |
1157 | } |
1158 | ||
1159 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1160 | ||
1161 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1162 | xfrm[nx++] = x; | |
1163 | daddr = remote; | |
1164 | saddr = local; | |
1165 | continue; | |
1166 | } | |
1167 | if (x) { | |
1168 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1169 | -EINVAL : -EAGAIN); | |
1170 | xfrm_state_put(x); | |
1171 | } | |
1172 | ||
1173 | if (!tmpl->optional) | |
1174 | goto fail; | |
1175 | } | |
1176 | return nx; | |
1177 | ||
1178 | fail: | |
1179 | for (nx--; nx>=0; nx--) | |
1180 | xfrm_state_put(xfrm[nx]); | |
1181 | return error; | |
1182 | } | |
1183 | ||
4e81bb83 MN |
1184 | static int |
1185 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1186 | struct xfrm_state **xfrm, | |
1187 | unsigned short family) | |
1188 | { | |
41a49cc3 MN |
1189 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1190 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1191 | int cnx = 0; |
1192 | int error; | |
1193 | int ret; | |
1194 | int i; | |
1195 | ||
1196 | for (i = 0; i < npols; i++) { | |
1197 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1198 | error = -ENOBUFS; | |
1199 | goto fail; | |
1200 | } | |
41a49cc3 MN |
1201 | |
1202 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1203 | if (ret < 0) { |
1204 | error = ret; | |
1205 | goto fail; | |
1206 | } else | |
1207 | cnx += ret; | |
1208 | } | |
1209 | ||
41a49cc3 MN |
1210 | /* found states are sorted for outbound processing */ |
1211 | if (npols > 1) | |
1212 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1213 | ||
4e81bb83 MN |
1214 | return cnx; |
1215 | ||
1216 | fail: | |
1217 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1218 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1219 | return error; |
1220 | ||
1221 | } | |
1222 | ||
1da177e4 LT |
1223 | /* Check that the bundle accepts the flow and its components are |
1224 | * still valid. | |
1225 | */ | |
1226 | ||
1227 | static struct dst_entry * | |
1228 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1229 | { | |
1230 | struct dst_entry *x; | |
1231 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1232 | if (unlikely(afinfo == NULL)) | |
1233 | return ERR_PTR(-EINVAL); | |
1234 | x = afinfo->find_bundle(fl, policy); | |
1235 | xfrm_policy_put_afinfo(afinfo); | |
1236 | return x; | |
1237 | } | |
1238 | ||
25ee3286 HX |
1239 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1240 | { | |
1241 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1242 | int tos; | |
1da177e4 | 1243 | |
25ee3286 HX |
1244 | if (!afinfo) |
1245 | return -EINVAL; | |
1246 | ||
1247 | tos = afinfo->get_tos(fl); | |
1248 | ||
1249 | xfrm_policy_put_afinfo(afinfo); | |
1250 | ||
1251 | return tos; | |
1252 | } | |
1253 | ||
1254 | static inline struct xfrm_dst *xfrm_alloc_dst(int family) | |
1da177e4 | 1255 | { |
1da177e4 | 1256 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
25ee3286 HX |
1257 | struct xfrm_dst *xdst; |
1258 | ||
1259 | if (!afinfo) | |
1260 | return ERR_PTR(-EINVAL); | |
1261 | ||
1262 | xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS); | |
1263 | ||
1264 | xfrm_policy_put_afinfo(afinfo); | |
1265 | ||
1266 | return xdst; | |
1267 | } | |
1268 | ||
1269 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) | |
1270 | { | |
1271 | struct xfrm_policy_afinfo *afinfo = | |
1272 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1273 | int err; | |
1274 | ||
1275 | if (!afinfo) | |
1da177e4 | 1276 | return -EINVAL; |
25ee3286 HX |
1277 | |
1278 | err = afinfo->fill_dst(xdst, dev); | |
1279 | ||
1da177e4 | 1280 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1281 | |
1da177e4 LT |
1282 | return err; |
1283 | } | |
1284 | ||
25ee3286 HX |
1285 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1286 | * all the metrics... Shortly, bundle a bundle. | |
1287 | */ | |
1288 | ||
1289 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1290 | struct xfrm_state **xfrm, int nx, | |
1291 | struct flowi *fl, | |
1292 | struct dst_entry *dst) | |
1293 | { | |
1294 | unsigned long now = jiffies; | |
1295 | struct net_device *dev; | |
1296 | struct dst_entry *dst_prev = NULL; | |
1297 | struct dst_entry *dst0 = NULL; | |
1298 | int i = 0; | |
1299 | int err; | |
1300 | int header_len = 0; | |
1301 | int trailer_len = 0; | |
1302 | int tos; | |
1303 | int family = policy->selector.family; | |
1304 | ||
1305 | tos = xfrm_get_tos(fl, family); | |
1306 | err = tos; | |
1307 | if (tos < 0) | |
1308 | goto put_states; | |
1309 | ||
1310 | dst_hold(dst); | |
1311 | ||
1312 | for (; i < nx; i++) { | |
1313 | struct xfrm_dst *xdst = xfrm_alloc_dst(family); | |
1314 | struct dst_entry *dst1 = &xdst->u.dst; | |
1315 | ||
1316 | err = PTR_ERR(xdst); | |
1317 | if (IS_ERR(xdst)) { | |
1318 | dst_release(dst); | |
1319 | goto put_states; | |
1320 | } | |
1321 | ||
1322 | if (!dst_prev) | |
1323 | dst0 = dst1; | |
1324 | else { | |
1325 | dst_prev->child = dst_clone(dst1); | |
1326 | dst1->flags |= DST_NOHASH; | |
1327 | } | |
1328 | ||
1329 | xdst->route = dst; | |
1330 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1331 | ||
1332 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1333 | family = xfrm[i]->props.family; | |
1334 | dst = xfrm_dst_lookup(xfrm[i], tos, family); | |
1335 | err = PTR_ERR(dst); | |
1336 | if (IS_ERR(dst)) | |
1337 | goto put_states; | |
1338 | } else | |
1339 | dst_hold(dst); | |
1340 | ||
1341 | dst1->xfrm = xfrm[i]; | |
1342 | xdst->genid = xfrm[i]->genid; | |
1343 | ||
1344 | dst1->obsolete = -1; | |
1345 | dst1->flags |= DST_HOST; | |
1346 | dst1->lastuse = now; | |
1347 | ||
1348 | dst1->input = dst_discard; | |
1349 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1350 | ||
1351 | dst1->next = dst_prev; | |
1352 | dst_prev = dst1; | |
1353 | ||
1354 | header_len += xfrm[i]->props.header_len; | |
1355 | trailer_len += xfrm[i]->props.trailer_len; | |
1356 | } | |
1357 | ||
1358 | dst_prev->child = dst; | |
1359 | dst0->path = dst; | |
1360 | ||
1361 | err = -ENODEV; | |
1362 | dev = dst->dev; | |
1363 | if (!dev) | |
1364 | goto free_dst; | |
1365 | ||
1366 | /* Copy neighbout for reachability confirmation */ | |
1367 | dst0->neighbour = neigh_clone(dst->neighbour); | |
1368 | ||
1369 | xfrm_init_pmtu(dst_prev); | |
1370 | ||
1371 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1372 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1373 | ||
1374 | err = xfrm_fill_dst(xdst, dev); | |
1375 | if (err) | |
1376 | goto free_dst; | |
1377 | ||
1378 | dst_prev->header_len = header_len; | |
1379 | dst_prev->trailer_len = trailer_len; | |
1380 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1381 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1382 | } | |
1383 | ||
1384 | out: | |
1385 | return dst0; | |
1386 | ||
1387 | put_states: | |
1388 | for (; i < nx; i++) | |
1389 | xfrm_state_put(xfrm[i]); | |
1390 | free_dst: | |
1391 | if (dst0) | |
1392 | dst_free(dst0); | |
1393 | dst0 = ERR_PTR(err); | |
1394 | goto out; | |
1395 | } | |
1396 | ||
157bfc25 MN |
1397 | static int inline |
1398 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1399 | { | |
1400 | if (!*target) { | |
1401 | *target = kmalloc(size, GFP_ATOMIC); | |
1402 | if (!*target) | |
1403 | return -ENOMEM; | |
1404 | } | |
1405 | memcpy(*target, src, size); | |
1406 | return 0; | |
1407 | } | |
1408 | ||
1409 | static int inline | |
1410 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1411 | { | |
1412 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1413 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1414 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1415 | sel, sizeof(*sel)); | |
1416 | #else | |
1417 | return 0; | |
1418 | #endif | |
1419 | } | |
1420 | ||
1421 | static int inline | |
1422 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1423 | { | |
1424 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1425 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1426 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1427 | #else | |
1428 | return 0; | |
1429 | #endif | |
1430 | } | |
1da177e4 LT |
1431 | |
1432 | static int stale_bundle(struct dst_entry *dst); | |
1433 | ||
1434 | /* Main function: finds/creates a bundle for given flow. | |
1435 | * | |
1436 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1437 | * on interfaces with disabled IPsec. | |
1438 | */ | |
14e50e57 DM |
1439 | int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, |
1440 | struct sock *sk, int flags) | |
1da177e4 LT |
1441 | { |
1442 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1443 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1444 | int npols; | |
1445 | int pol_dead; | |
1446 | int xfrm_nr; | |
1447 | int pi; | |
1da177e4 LT |
1448 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1449 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1450 | int nx = 0; | |
1451 | int err; | |
1452 | u32 genid; | |
42cf93cd | 1453 | u16 family; |
df71837d | 1454 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1455 | |
1da177e4 LT |
1456 | restart: |
1457 | genid = atomic_read(&flow_cache_genid); | |
1458 | policy = NULL; | |
4e81bb83 MN |
1459 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1460 | pols[pi] = NULL; | |
1461 | npols = 0; | |
1462 | pol_dead = 0; | |
1463 | xfrm_nr = 0; | |
1464 | ||
f7944fb1 | 1465 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1466 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
75b8c133 | 1467 | err = PTR_ERR(policy); |
3bccfbc7 | 1468 | if (IS_ERR(policy)) |
75b8c133 | 1469 | goto dropdst; |
3bccfbc7 | 1470 | } |
1da177e4 LT |
1471 | |
1472 | if (!policy) { | |
1473 | /* To accelerate a bit... */ | |
2518c7c2 DM |
1474 | if ((dst_orig->flags & DST_NOXFRM) || |
1475 | !xfrm_policy_count[XFRM_POLICY_OUT]) | |
1da177e4 LT |
1476 | return 0; |
1477 | ||
e0d1caa7 | 1478 | policy = flow_cache_lookup(fl, dst_orig->ops->family, |
42cf93cd | 1479 | dir, xfrm_policy_lookup); |
75b8c133 | 1480 | err = PTR_ERR(policy); |
134b0fc5 | 1481 | if (IS_ERR(policy)) |
75b8c133 | 1482 | goto dropdst; |
1da177e4 LT |
1483 | } |
1484 | ||
1485 | if (!policy) | |
1486 | return 0; | |
1487 | ||
42cf93cd | 1488 | family = dst_orig->ops->family; |
9d729f72 | 1489 | policy->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1490 | pols[0] = policy; |
1491 | npols ++; | |
1492 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 LT |
1493 | |
1494 | switch (policy->action) { | |
5e5234ff | 1495 | default: |
1da177e4 LT |
1496 | case XFRM_POLICY_BLOCK: |
1497 | /* Prohibit the flow */ | |
e104411b PM |
1498 | err = -EPERM; |
1499 | goto error; | |
1da177e4 LT |
1500 | |
1501 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1502 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1503 | if (policy->xfrm_nr == 0) { |
1504 | /* Flow passes not transformed. */ | |
1505 | xfrm_pol_put(policy); | |
1506 | return 0; | |
1507 | } | |
4e81bb83 | 1508 | #endif |
1da177e4 LT |
1509 | |
1510 | /* Try to find matching bundle. | |
1511 | * | |
1512 | * LATER: help from flow cache. It is optional, this | |
1513 | * is required only for output policy. | |
1514 | */ | |
1515 | dst = xfrm_find_bundle(fl, policy, family); | |
1516 | if (IS_ERR(dst)) { | |
e104411b PM |
1517 | err = PTR_ERR(dst); |
1518 | goto error; | |
1da177e4 LT |
1519 | } |
1520 | ||
1521 | if (dst) | |
1522 | break; | |
1523 | ||
4e81bb83 MN |
1524 | #ifdef CONFIG_XFRM_SUB_POLICY |
1525 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1526 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1527 | fl, family, | |
1528 | XFRM_POLICY_OUT); | |
1529 | if (pols[1]) { | |
134b0fc5 JM |
1530 | if (IS_ERR(pols[1])) { |
1531 | err = PTR_ERR(pols[1]); | |
1532 | goto error; | |
1533 | } | |
4e81bb83 MN |
1534 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
1535 | err = -EPERM; | |
1536 | goto error; | |
1537 | } | |
1538 | npols ++; | |
1539 | xfrm_nr += pols[1]->xfrm_nr; | |
1540 | } | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * Because neither flowi nor bundle information knows about | |
1545 | * transformation template size. On more than one policy usage | |
1546 | * we can realize whether all of them is bypass or not after | |
1547 | * they are searched. See above not-transformed bypass | |
1548 | * is surrounded by non-sub policy configuration, too. | |
1549 | */ | |
1550 | if (xfrm_nr == 0) { | |
1551 | /* Flow passes not transformed. */ | |
1552 | xfrm_pols_put(pols, npols); | |
1553 | return 0; | |
1554 | } | |
1555 | ||
1556 | #endif | |
1557 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1558 | |
1559 | if (unlikely(nx<0)) { | |
1560 | err = nx; | |
14e50e57 DM |
1561 | if (err == -EAGAIN && sysctl_xfrm_larval_drop) { |
1562 | /* EREMOTE tells the caller to generate | |
1563 | * a one-shot blackhole route. | |
1564 | */ | |
1565 | xfrm_pol_put(policy); | |
1566 | return -EREMOTE; | |
1567 | } | |
1da177e4 LT |
1568 | if (err == -EAGAIN && flags) { |
1569 | DECLARE_WAITQUEUE(wait, current); | |
1570 | ||
1571 | add_wait_queue(&km_waitq, &wait); | |
1572 | set_current_state(TASK_INTERRUPTIBLE); | |
1573 | schedule(); | |
1574 | set_current_state(TASK_RUNNING); | |
1575 | remove_wait_queue(&km_waitq, &wait); | |
1576 | ||
4e81bb83 | 1577 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1578 | |
1579 | if (nx == -EAGAIN && signal_pending(current)) { | |
1580 | err = -ERESTART; | |
1581 | goto error; | |
1582 | } | |
1583 | if (nx == -EAGAIN || | |
1584 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1585 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1586 | goto restart; |
1587 | } | |
1588 | err = nx; | |
1589 | } | |
1590 | if (err < 0) | |
1591 | goto error; | |
1592 | } | |
1593 | if (nx == 0) { | |
1594 | /* Flow passes not transformed. */ | |
4e81bb83 | 1595 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1596 | return 0; |
1597 | } | |
1598 | ||
25ee3286 HX |
1599 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1600 | err = PTR_ERR(dst); | |
1601 | if (IS_ERR(dst)) | |
1da177e4 | 1602 | goto error; |
1da177e4 | 1603 | |
4e81bb83 MN |
1604 | for (pi = 0; pi < npols; pi++) { |
1605 | read_lock_bh(&pols[pi]->lock); | |
1606 | pol_dead |= pols[pi]->dead; | |
1607 | read_unlock_bh(&pols[pi]->lock); | |
1608 | } | |
1609 | ||
1da177e4 | 1610 | write_lock_bh(&policy->lock); |
4e81bb83 | 1611 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1612 | /* Wow! While we worked on resolving, this |
1613 | * policy has gone. Retry. It is not paranoia, | |
1614 | * we just cannot enlist new bundle to dead object. | |
1615 | * We can't enlist stable bundles either. | |
1616 | */ | |
1617 | write_unlock_bh(&policy->lock); | |
1da177e4 LT |
1618 | if (dst) |
1619 | dst_free(dst); | |
00de651d HX |
1620 | |
1621 | err = -EHOSTUNREACH; | |
1622 | goto error; | |
1da177e4 | 1623 | } |
157bfc25 MN |
1624 | |
1625 | if (npols > 1) | |
1626 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1627 | else | |
1628 | err = xfrm_dst_update_origin(dst, fl); | |
1629 | if (unlikely(err)) { | |
1630 | write_unlock_bh(&policy->lock); | |
1631 | if (dst) | |
1632 | dst_free(dst); | |
1633 | goto error; | |
1634 | } | |
1635 | ||
1da177e4 LT |
1636 | dst->next = policy->bundles; |
1637 | policy->bundles = dst; | |
1638 | dst_hold(dst); | |
1639 | write_unlock_bh(&policy->lock); | |
1640 | } | |
1641 | *dst_p = dst; | |
1642 | dst_release(dst_orig); | |
a716c119 | 1643 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1644 | return 0; |
1645 | ||
1646 | error: | |
4e81bb83 | 1647 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1648 | dropdst: |
1649 | dst_release(dst_orig); | |
1da177e4 LT |
1650 | *dst_p = NULL; |
1651 | return err; | |
1652 | } | |
14e50e57 DM |
1653 | EXPORT_SYMBOL(__xfrm_lookup); |
1654 | ||
1655 | int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, | |
1656 | struct sock *sk, int flags) | |
1657 | { | |
1658 | int err = __xfrm_lookup(dst_p, fl, sk, flags); | |
1659 | ||
1660 | if (err == -EREMOTE) { | |
1661 | dst_release(*dst_p); | |
1662 | *dst_p = NULL; | |
1663 | err = -EAGAIN; | |
1664 | } | |
1665 | ||
1666 | return err; | |
1667 | } | |
1da177e4 LT |
1668 | EXPORT_SYMBOL(xfrm_lookup); |
1669 | ||
df0ba92a MN |
1670 | static inline int |
1671 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1672 | { | |
1673 | struct xfrm_state *x; | |
df0ba92a MN |
1674 | |
1675 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1676 | return 0; | |
1677 | x = skb->sp->xvec[idx]; | |
1678 | if (!x->type->reject) | |
1679 | return 0; | |
1ecafede | 1680 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1681 | } |
1682 | ||
1da177e4 LT |
1683 | /* When skb is transformed back to its "native" form, we have to |
1684 | * check policy restrictions. At the moment we make this in maximally | |
1685 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1686 | * have policy cached at them. | |
1687 | */ | |
1688 | ||
1689 | static inline int | |
a716c119 | 1690 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1691 | unsigned short family) |
1692 | { | |
1693 | if (xfrm_state_kern(x)) | |
928ba416 | 1694 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1695 | return x->id.proto == tmpl->id.proto && |
1696 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1697 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1698 | x->props.mode == tmpl->mode && | |
f3bd4840 MN |
1699 | ((tmpl->aalgos & (1<<x->props.aalgo)) || |
1700 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && | |
7e49e6de MN |
1701 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1702 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1703 | } |
1704 | ||
df0ba92a MN |
1705 | /* |
1706 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1707 | * because of optional transport mode, or next index of the mathced secpath | |
1708 | * state with the template. | |
1709 | * -1 is returned when no matching template is found. | |
1710 | * Otherwise "-2 - errored_index" is returned. | |
1711 | */ | |
1da177e4 LT |
1712 | static inline int |
1713 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1714 | unsigned short family) | |
1715 | { | |
1716 | int idx = start; | |
1717 | ||
1718 | if (tmpl->optional) { | |
7e49e6de | 1719 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1720 | return start; |
1721 | } else | |
1722 | start = -1; | |
1723 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1724 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1725 | return ++idx; |
df0ba92a MN |
1726 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1727 | if (start == -1) | |
1728 | start = -2-idx; | |
1da177e4 | 1729 | break; |
df0ba92a | 1730 | } |
1da177e4 LT |
1731 | } |
1732 | return start; | |
1733 | } | |
1734 | ||
3e3850e9 PM |
1735 | int |
1736 | xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family) | |
1da177e4 LT |
1737 | { |
1738 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1739 | int err; |
1da177e4 LT |
1740 | |
1741 | if (unlikely(afinfo == NULL)) | |
1742 | return -EAFNOSUPPORT; | |
1743 | ||
1744 | afinfo->decode_session(skb, fl); | |
beb8d13b | 1745 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1746 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1747 | return err; |
1da177e4 | 1748 | } |
3e3850e9 | 1749 | EXPORT_SYMBOL(xfrm_decode_session); |
1da177e4 | 1750 | |
df0ba92a | 1751 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1752 | { |
1753 | for (; k < sp->len; k++) { | |
df0ba92a | 1754 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1755 | *idxp = k; |
1da177e4 | 1756 | return 1; |
df0ba92a | 1757 | } |
1da177e4 LT |
1758 | } |
1759 | ||
1760 | return 0; | |
1761 | } | |
1762 | ||
a716c119 | 1763 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1764 | unsigned short family) |
1765 | { | |
1766 | struct xfrm_policy *pol; | |
4e81bb83 MN |
1767 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1768 | int npols = 0; | |
1769 | int xfrm_nr; | |
1770 | int pi; | |
1da177e4 | 1771 | struct flowi fl; |
df71837d | 1772 | u8 fl_dir = policy_to_flow_dir(dir); |
df0ba92a | 1773 | int xerr_idx = -1; |
1da177e4 | 1774 | |
3e3850e9 | 1775 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 | 1776 | return 0; |
eb9c7ebe | 1777 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1778 | |
1779 | /* First, check used SA against their selectors. */ | |
1780 | if (skb->sp) { | |
1781 | int i; | |
1782 | ||
1783 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa HX |
1784 | struct xfrm_state *x = skb->sp->xvec[i]; |
1785 | if (!xfrm_selector_match(&x->sel, &fl, family)) | |
1da177e4 | 1786 | return 0; |
1da177e4 LT |
1787 | } |
1788 | } | |
1789 | ||
1790 | pol = NULL; | |
3bccfbc7 | 1791 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1792 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
3bccfbc7 VY |
1793 | if (IS_ERR(pol)) |
1794 | return 0; | |
1795 | } | |
1da177e4 LT |
1796 | |
1797 | if (!pol) | |
e0d1caa7 | 1798 | pol = flow_cache_lookup(&fl, family, fl_dir, |
1da177e4 LT |
1799 | xfrm_policy_lookup); |
1800 | ||
134b0fc5 JM |
1801 | if (IS_ERR(pol)) |
1802 | return 0; | |
1803 | ||
df0ba92a | 1804 | if (!pol) { |
d1d9facf | 1805 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a MN |
1806 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
1807 | return 0; | |
1808 | } | |
1809 | return 1; | |
1810 | } | |
1da177e4 | 1811 | |
9d729f72 | 1812 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1813 | |
4e81bb83 MN |
1814 | pols[0] = pol; |
1815 | npols ++; | |
1816 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1817 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1818 | pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, | |
1819 | &fl, family, | |
1820 | XFRM_POLICY_IN); | |
1821 | if (pols[1]) { | |
134b0fc5 JM |
1822 | if (IS_ERR(pols[1])) |
1823 | return 0; | |
9d729f72 | 1824 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1825 | npols ++; |
1826 | } | |
1827 | } | |
1828 | #endif | |
1829 | ||
1da177e4 LT |
1830 | if (pol->action == XFRM_POLICY_ALLOW) { |
1831 | struct sec_path *sp; | |
1832 | static struct sec_path dummy; | |
4e81bb83 | 1833 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1834 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1835 | struct xfrm_tmpl **tpp = tp; |
1836 | int ti = 0; | |
1da177e4 LT |
1837 | int i, k; |
1838 | ||
1839 | if ((sp = skb->sp) == NULL) | |
1840 | sp = &dummy; | |
1841 | ||
4e81bb83 MN |
1842 | for (pi = 0; pi < npols; pi++) { |
1843 | if (pols[pi] != pol && | |
1844 | pols[pi]->action != XFRM_POLICY_ALLOW) | |
1845 | goto reject; | |
1846 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) | |
1847 | goto reject_error; | |
1848 | for (i = 0; i < pols[pi]->xfrm_nr; i++) | |
1849 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1850 | } | |
1851 | xfrm_nr = ti; | |
41a49cc3 MN |
1852 | if (npols > 1) { |
1853 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
1854 | tpp = stp; | |
1855 | } | |
4e81bb83 | 1856 | |
1da177e4 LT |
1857 | /* For each tunnel xfrm, find the first matching tmpl. |
1858 | * For each tmpl before that, find corresponding xfrm. | |
1859 | * Order is _important_. Later we will implement | |
1860 | * some barriers, but at the moment barriers | |
1861 | * are implied between each two transformations. | |
1862 | */ | |
4e81bb83 MN |
1863 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
1864 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 1865 | if (k < 0) { |
d1d9facf JM |
1866 | if (k < -1) |
1867 | /* "-2 - errored_index" returned */ | |
1868 | xerr_idx = -(2+k); | |
1da177e4 | 1869 | goto reject; |
df0ba92a | 1870 | } |
1da177e4 LT |
1871 | } |
1872 | ||
d1d9facf | 1873 | if (secpath_has_nontransport(sp, k, &xerr_idx)) |
1da177e4 LT |
1874 | goto reject; |
1875 | ||
4e81bb83 | 1876 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1877 | return 1; |
1878 | } | |
1879 | ||
1880 | reject: | |
df0ba92a | 1881 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
1882 | reject_error: |
1883 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
1884 | return 0; |
1885 | } | |
1886 | EXPORT_SYMBOL(__xfrm_policy_check); | |
1887 | ||
1888 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
1889 | { | |
1890 | struct flowi fl; | |
1891 | ||
3e3850e9 | 1892 | if (xfrm_decode_session(skb, &fl, family) < 0) |
1da177e4 LT |
1893 | return 0; |
1894 | ||
1895 | return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0; | |
1896 | } | |
1897 | EXPORT_SYMBOL(__xfrm_route_forward); | |
1898 | ||
d49c73c7 DM |
1899 | /* Optimize later using cookies and generation ids. */ |
1900 | ||
1da177e4 LT |
1901 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
1902 | { | |
d49c73c7 DM |
1903 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
1904 | * to "-1" to force all XFRM destinations to get validated by | |
1905 | * dst_ops->check on every use. We do this because when a | |
1906 | * normal route referenced by an XFRM dst is obsoleted we do | |
1907 | * not go looking around for all parent referencing XFRM dsts | |
1908 | * so that we can invalidate them. It is just too much work. | |
1909 | * Instead we make the checks here on every use. For example: | |
1910 | * | |
1911 | * XFRM dst A --> IPv4 dst X | |
1912 | * | |
1913 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
1914 | * in this example). If X is marked obsolete, "A" will not | |
1915 | * notice. That's what we are validating here via the | |
1916 | * stale_bundle() check. | |
1917 | * | |
1918 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
1919 | * dst which causes it's ->obsolete field to be set to a | |
1920 | * positive non-zero integer. If an XFRM dst has been pruned | |
1921 | * like this, we want to force a new route lookup. | |
399c180a | 1922 | */ |
d49c73c7 DM |
1923 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
1924 | return dst; | |
1925 | ||
1da177e4 LT |
1926 | return NULL; |
1927 | } | |
1928 | ||
1929 | static int stale_bundle(struct dst_entry *dst) | |
1930 | { | |
5b368e61 | 1931 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
1932 | } |
1933 | ||
aabc9761 | 1934 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 1935 | { |
1da177e4 | 1936 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
2774c7ab | 1937 | dst->dev = init_net.loopback_dev; |
de3cb747 | 1938 | dev_hold(dst->dev); |
1da177e4 LT |
1939 | dev_put(dev); |
1940 | } | |
1941 | } | |
aabc9761 | 1942 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
1943 | |
1944 | static void xfrm_link_failure(struct sk_buff *skb) | |
1945 | { | |
1946 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1947 | return; | |
1948 | } | |
1949 | ||
1950 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
1951 | { | |
1952 | if (dst) { | |
1953 | if (dst->obsolete) { | |
1954 | dst_release(dst); | |
1955 | dst = NULL; | |
1956 | } | |
1957 | } | |
1958 | return dst; | |
1959 | } | |
1960 | ||
2518c7c2 DM |
1961 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
1962 | { | |
1963 | struct dst_entry *dst, **dstp; | |
1964 | ||
1965 | write_lock(&pol->lock); | |
1966 | dstp = &pol->bundles; | |
1967 | while ((dst=*dstp) != NULL) { | |
1968 | if (func(dst)) { | |
1969 | *dstp = dst->next; | |
1970 | dst->next = *gc_list_p; | |
1971 | *gc_list_p = dst; | |
1972 | } else { | |
1973 | dstp = &dst->next; | |
1974 | } | |
1975 | } | |
1976 | write_unlock(&pol->lock); | |
1977 | } | |
1978 | ||
1da177e4 LT |
1979 | static void xfrm_prune_bundles(int (*func)(struct dst_entry *)) |
1980 | { | |
2518c7c2 DM |
1981 | struct dst_entry *gc_list = NULL; |
1982 | int dir; | |
1da177e4 LT |
1983 | |
1984 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
1985 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
1986 | struct xfrm_policy *pol; | |
1987 | struct hlist_node *entry; | |
1988 | struct hlist_head *table; | |
1989 | int i; | |
4e81bb83 | 1990 | |
2518c7c2 DM |
1991 | hlist_for_each_entry(pol, entry, |
1992 | &xfrm_policy_inexact[dir], bydst) | |
1993 | prune_one_bundle(pol, func, &gc_list); | |
1994 | ||
1995 | table = xfrm_policy_bydst[dir].table; | |
1996 | for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) { | |
1997 | hlist_for_each_entry(pol, entry, table + i, bydst) | |
1998 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
1999 | } |
2000 | } | |
2001 | read_unlock_bh(&xfrm_policy_lock); | |
2002 | ||
2003 | while (gc_list) { | |
2518c7c2 | 2004 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2005 | gc_list = dst->next; |
2006 | dst_free(dst); | |
2007 | } | |
2008 | } | |
2009 | ||
2010 | static int unused_bundle(struct dst_entry *dst) | |
2011 | { | |
2012 | return !atomic_read(&dst->__refcnt); | |
2013 | } | |
2014 | ||
2015 | static void __xfrm_garbage_collect(void) | |
2016 | { | |
2017 | xfrm_prune_bundles(unused_bundle); | |
2018 | } | |
2019 | ||
1c095399 | 2020 | static int xfrm_flush_bundles(void) |
1da177e4 LT |
2021 | { |
2022 | xfrm_prune_bundles(stale_bundle); | |
2023 | return 0; | |
2024 | } | |
2025 | ||
25ee3286 | 2026 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2027 | { |
2028 | do { | |
2029 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2030 | u32 pmtu, route_mtu_cached; | |
2031 | ||
2032 | pmtu = dst_mtu(dst->child); | |
2033 | xdst->child_mtu_cached = pmtu; | |
2034 | ||
2035 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2036 | ||
2037 | route_mtu_cached = dst_mtu(xdst->route); | |
2038 | xdst->route_mtu_cached = route_mtu_cached; | |
2039 | ||
2040 | if (pmtu > route_mtu_cached) | |
2041 | pmtu = route_mtu_cached; | |
2042 | ||
2043 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2044 | } while ((dst = dst->next)); | |
2045 | } | |
2046 | ||
1da177e4 LT |
2047 | /* Check that the bundle accepts the flow and its components are |
2048 | * still valid. | |
2049 | */ | |
2050 | ||
5b368e61 VY |
2051 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2052 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2053 | { |
2054 | struct dst_entry *dst = &first->u.dst; | |
2055 | struct xfrm_dst *last; | |
2056 | u32 mtu; | |
2057 | ||
92d63dec | 2058 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2059 | (dst->dev && !netif_running(dst->dev))) |
2060 | return 0; | |
157bfc25 MN |
2061 | #ifdef CONFIG_XFRM_SUB_POLICY |
2062 | if (fl) { | |
2063 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2064 | return 0; | |
2065 | if (first->partner && | |
2066 | !xfrm_selector_match(first->partner, fl, family)) | |
2067 | return 0; | |
2068 | } | |
2069 | #endif | |
1da177e4 LT |
2070 | |
2071 | last = NULL; | |
2072 | ||
2073 | do { | |
2074 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2075 | ||
2076 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2077 | return 0; | |
67f83cbf VY |
2078 | if (fl && pol && |
2079 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2080 | return 0; |
1da177e4 LT |
2081 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2082 | return 0; | |
9d4a706d DM |
2083 | if (xdst->genid != dst->xfrm->genid) |
2084 | return 0; | |
e53820de | 2085 | |
1bfcb10f | 2086 | if (strict && fl && |
13996378 | 2087 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2088 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2089 | return 0; | |
1da177e4 LT |
2090 | |
2091 | mtu = dst_mtu(dst->child); | |
2092 | if (xdst->child_mtu_cached != mtu) { | |
2093 | last = xdst; | |
2094 | xdst->child_mtu_cached = mtu; | |
2095 | } | |
2096 | ||
92d63dec | 2097 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2098 | return 0; |
2099 | mtu = dst_mtu(xdst->route); | |
2100 | if (xdst->route_mtu_cached != mtu) { | |
2101 | last = xdst; | |
2102 | xdst->route_mtu_cached = mtu; | |
2103 | } | |
2104 | ||
2105 | dst = dst->child; | |
2106 | } while (dst->xfrm); | |
2107 | ||
2108 | if (likely(!last)) | |
2109 | return 1; | |
2110 | ||
2111 | mtu = last->child_mtu_cached; | |
2112 | for (;;) { | |
2113 | dst = &last->u.dst; | |
2114 | ||
2115 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2116 | if (mtu > last->route_mtu_cached) | |
2117 | mtu = last->route_mtu_cached; | |
2118 | dst->metrics[RTAX_MTU-1] = mtu; | |
2119 | ||
2120 | if (last == first) | |
2121 | break; | |
2122 | ||
bd0bf076 | 2123 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2124 | last->child_mtu_cached = mtu; |
2125 | } | |
2126 | ||
2127 | return 1; | |
2128 | } | |
2129 | ||
2130 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2131 | ||
1da177e4 LT |
2132 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2133 | { | |
2134 | int err = 0; | |
2135 | if (unlikely(afinfo == NULL)) | |
2136 | return -EINVAL; | |
2137 | if (unlikely(afinfo->family >= NPROTO)) | |
2138 | return -EAFNOSUPPORT; | |
e959d812 | 2139 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2140 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2141 | err = -ENOBUFS; | |
2142 | else { | |
2143 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2144 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2145 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2146 | if (likely(dst_ops->check == NULL)) | |
2147 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2148 | if (likely(dst_ops->negative_advice == NULL)) |
2149 | dst_ops->negative_advice = xfrm_negative_advice; | |
2150 | if (likely(dst_ops->link_failure == NULL)) | |
2151 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2152 | if (likely(afinfo->garbage_collect == NULL)) |
2153 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2154 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2155 | } | |
e959d812 | 2156 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2157 | return err; |
2158 | } | |
2159 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2160 | ||
2161 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2162 | { | |
2163 | int err = 0; | |
2164 | if (unlikely(afinfo == NULL)) | |
2165 | return -EINVAL; | |
2166 | if (unlikely(afinfo->family >= NPROTO)) | |
2167 | return -EAFNOSUPPORT; | |
e959d812 | 2168 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2169 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2170 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2171 | err = -EINVAL; | |
2172 | else { | |
2173 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2174 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2175 | dst_ops->kmem_cachep = NULL; | |
2176 | dst_ops->check = NULL; | |
1da177e4 LT |
2177 | dst_ops->negative_advice = NULL; |
2178 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2179 | afinfo->garbage_collect = NULL; |
2180 | } | |
2181 | } | |
e959d812 | 2182 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2183 | return err; |
2184 | } | |
2185 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2186 | ||
2187 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) | |
2188 | { | |
2189 | struct xfrm_policy_afinfo *afinfo; | |
2190 | if (unlikely(family >= NPROTO)) | |
2191 | return NULL; | |
2192 | read_lock(&xfrm_policy_afinfo_lock); | |
2193 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2194 | if (unlikely(!afinfo)) |
2195 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2196 | return afinfo; |
2197 | } | |
2198 | ||
2199 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2200 | { | |
546be240 HX |
2201 | read_unlock(&xfrm_policy_afinfo_lock); |
2202 | } | |
2203 | ||
1da177e4 LT |
2204 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2205 | { | |
e9dc8653 EB |
2206 | struct net_device *dev = ptr; |
2207 | ||
2208 | if (dev->nd_net != &init_net) | |
2209 | return NOTIFY_DONE; | |
2210 | ||
1da177e4 LT |
2211 | switch (event) { |
2212 | case NETDEV_DOWN: | |
2213 | xfrm_flush_bundles(); | |
2214 | } | |
2215 | return NOTIFY_DONE; | |
2216 | } | |
2217 | ||
2218 | static struct notifier_block xfrm_dev_notifier = { | |
2219 | xfrm_dev_event, | |
2220 | NULL, | |
2221 | 0 | |
2222 | }; | |
2223 | ||
2224 | static void __init xfrm_policy_init(void) | |
2225 | { | |
2518c7c2 DM |
2226 | unsigned int hmask, sz; |
2227 | int dir; | |
2228 | ||
1da177e4 LT |
2229 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", |
2230 | sizeof(struct xfrm_dst), | |
e5d679f3 | 2231 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2232 | NULL); |
1da177e4 | 2233 | |
2518c7c2 DM |
2234 | hmask = 8 - 1; |
2235 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2236 | ||
44e36b42 | 2237 | xfrm_policy_byidx = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2238 | xfrm_idx_hmask = hmask; |
2239 | if (!xfrm_policy_byidx) | |
2240 | panic("XFRM: failed to allocate byidx hash\n"); | |
2241 | ||
2242 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2243 | struct xfrm_policy_hash *htab; | |
2244 | ||
2245 | INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]); | |
2246 | ||
2247 | htab = &xfrm_policy_bydst[dir]; | |
44e36b42 | 2248 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 DM |
2249 | htab->hmask = hmask; |
2250 | if (!htab->table) | |
2251 | panic("XFRM: failed to allocate bydst hash\n"); | |
2252 | } | |
2253 | ||
c4028958 | 2254 | INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
2255 | register_netdevice_notifier(&xfrm_dev_notifier); |
2256 | } | |
2257 | ||
2258 | void __init xfrm_init(void) | |
2259 | { | |
2260 | xfrm_state_init(); | |
2261 | xfrm_policy_init(); | |
2262 | xfrm_input_init(); | |
2263 | } | |
2264 | ||
ab5f5e8b JL |
2265 | #ifdef CONFIG_AUDITSYSCALL |
2266 | static inline void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, | |
2267 | struct audit_buffer *audit_buf) | |
2268 | { | |
2269 | if (xp->security) | |
2270 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", | |
2271 | xp->security->ctx_alg, xp->security->ctx_doi, | |
2272 | xp->security->ctx_str); | |
2273 | ||
2274 | switch(xp->selector.family) { | |
2275 | case AF_INET: | |
2276 | audit_log_format(audit_buf, " src=%u.%u.%u.%u dst=%u.%u.%u.%u", | |
2277 | NIPQUAD(xp->selector.saddr.a4), | |
2278 | NIPQUAD(xp->selector.daddr.a4)); | |
2279 | break; | |
2280 | case AF_INET6: | |
2281 | { | |
2282 | struct in6_addr saddr6, daddr6; | |
2283 | ||
2284 | memcpy(&saddr6, xp->selector.saddr.a6, | |
2285 | sizeof(struct in6_addr)); | |
2286 | memcpy(&daddr6, xp->selector.daddr.a6, | |
2287 | sizeof(struct in6_addr)); | |
2288 | audit_log_format(audit_buf, | |
2289 | " src=" NIP6_FMT " dst=" NIP6_FMT, | |
2290 | NIP6(saddr6), NIP6(daddr6)); | |
2291 | } | |
2292 | break; | |
2293 | } | |
2294 | } | |
2295 | ||
2296 | void | |
2297 | xfrm_audit_policy_add(struct xfrm_policy *xp, int result, u32 auid, u32 sid) | |
2298 | { | |
2299 | struct audit_buffer *audit_buf; | |
2300 | extern int audit_enabled; | |
2301 | ||
2302 | if (audit_enabled == 0) | |
2303 | return; | |
5951cab1 | 2304 | audit_buf = xfrm_audit_start(auid, sid); |
ab5f5e8b JL |
2305 | if (audit_buf == NULL) |
2306 | return; | |
2307 | audit_log_format(audit_buf, " op=SPD-add res=%u", result); | |
2308 | xfrm_audit_common_policyinfo(xp, audit_buf); | |
2309 | audit_log_end(audit_buf); | |
2310 | } | |
2311 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2312 | ||
2313 | void | |
2314 | xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, u32 auid, u32 sid) | |
2315 | { | |
2316 | struct audit_buffer *audit_buf; | |
2317 | extern int audit_enabled; | |
2318 | ||
2319 | if (audit_enabled == 0) | |
2320 | return; | |
5951cab1 | 2321 | audit_buf = xfrm_audit_start(auid, sid); |
ab5f5e8b JL |
2322 | if (audit_buf == NULL) |
2323 | return; | |
2324 | audit_log_format(audit_buf, " op=SPD-delete res=%u", result); | |
2325 | xfrm_audit_common_policyinfo(xp, audit_buf); | |
2326 | audit_log_end(audit_buf); | |
2327 | } | |
2328 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2329 | #endif | |
2330 | ||
80c9abaa SS |
2331 | #ifdef CONFIG_XFRM_MIGRATE |
2332 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2333 | struct xfrm_selector *sel_tgt) | |
2334 | { | |
2335 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2336 | if (sel_tgt->family == sel_cmp->family && | |
2337 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2338 | sel_cmp->family) == 0 && |
80c9abaa SS |
2339 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2340 | sel_cmp->family) == 0 && | |
2341 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2342 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2343 | return 1; | |
2344 | } | |
2345 | } else { | |
2346 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2347 | return 1; | |
2348 | } | |
2349 | } | |
2350 | return 0; | |
2351 | } | |
2352 | ||
2353 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2354 | u8 dir, u8 type) | |
2355 | { | |
2356 | struct xfrm_policy *pol, *ret = NULL; | |
2357 | struct hlist_node *entry; | |
2358 | struct hlist_head *chain; | |
2359 | u32 priority = ~0U; | |
2360 | ||
2361 | read_lock_bh(&xfrm_policy_lock); | |
2362 | chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir); | |
2363 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2364 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2365 | pol->type == type) { | |
2366 | ret = pol; | |
2367 | priority = ret->priority; | |
2368 | break; | |
2369 | } | |
2370 | } | |
2371 | chain = &xfrm_policy_inexact[dir]; | |
2372 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
2373 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2374 | pol->type == type && | |
2375 | pol->priority < priority) { | |
2376 | ret = pol; | |
2377 | break; | |
2378 | } | |
2379 | } | |
2380 | ||
2381 | if (ret) | |
2382 | xfrm_pol_hold(ret); | |
2383 | ||
2384 | read_unlock_bh(&xfrm_policy_lock); | |
2385 | ||
2386 | return ret; | |
2387 | } | |
2388 | ||
2389 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2390 | { | |
2391 | int match = 0; | |
2392 | ||
2393 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2394 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2395 | switch (t->mode) { | |
2396 | case XFRM_MODE_TUNNEL: | |
2397 | case XFRM_MODE_BEET: | |
2398 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2399 | m->old_family) == 0 && | |
2400 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2401 | m->old_family) == 0) { | |
2402 | match = 1; | |
2403 | } | |
2404 | break; | |
2405 | case XFRM_MODE_TRANSPORT: | |
2406 | /* in case of transport mode, template does not store | |
2407 | any IP addresses, hence we just compare mode and | |
2408 | protocol */ | |
2409 | match = 1; | |
2410 | break; | |
2411 | default: | |
2412 | break; | |
2413 | } | |
2414 | } | |
2415 | return match; | |
2416 | } | |
2417 | ||
2418 | /* update endpoint address(es) of template(s) */ | |
2419 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2420 | struct xfrm_migrate *m, int num_migrate) | |
2421 | { | |
2422 | struct xfrm_migrate *mp; | |
2423 | struct dst_entry *dst; | |
2424 | int i, j, n = 0; | |
2425 | ||
2426 | write_lock_bh(&pol->lock); | |
2427 | if (unlikely(pol->dead)) { | |
2428 | /* target policy has been deleted */ | |
2429 | write_unlock_bh(&pol->lock); | |
2430 | return -ENOENT; | |
2431 | } | |
2432 | ||
2433 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2434 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2435 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2436 | continue; | |
2437 | n++; | |
1bfcb10f HX |
2438 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2439 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2440 | continue; |
2441 | /* update endpoints */ | |
2442 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2443 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2444 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2445 | sizeof(pol->xfrm_vec[i].saddr)); | |
2446 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2447 | /* flush bundles */ | |
2448 | while ((dst = pol->bundles) != NULL) { | |
2449 | pol->bundles = dst->next; | |
2450 | dst_free(dst); | |
2451 | } | |
2452 | } | |
2453 | } | |
2454 | ||
2455 | write_unlock_bh(&pol->lock); | |
2456 | ||
2457 | if (!n) | |
2458 | return -ENODATA; | |
2459 | ||
2460 | return 0; | |
2461 | } | |
2462 | ||
2463 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2464 | { | |
2465 | int i, j; | |
2466 | ||
2467 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2468 | return -EINVAL; | |
2469 | ||
2470 | for (i = 0; i < num_migrate; i++) { | |
2471 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2472 | m[i].old_family) == 0) && | |
2473 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2474 | m[i].old_family) == 0)) | |
2475 | return -EINVAL; | |
2476 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2477 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2478 | return -EINVAL; | |
2479 | ||
2480 | /* check if there is any duplicated entry */ | |
2481 | for (j = i + 1; j < num_migrate; j++) { | |
2482 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2483 | sizeof(m[i].old_daddr)) && | |
2484 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2485 | sizeof(m[i].old_saddr)) && | |
2486 | m[i].proto == m[j].proto && | |
2487 | m[i].mode == m[j].mode && | |
2488 | m[i].reqid == m[j].reqid && | |
2489 | m[i].old_family == m[j].old_family) | |
2490 | return -EINVAL; | |
2491 | } | |
2492 | } | |
2493 | ||
2494 | return 0; | |
2495 | } | |
2496 | ||
2497 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
2498 | struct xfrm_migrate *m, int num_migrate) | |
2499 | { | |
2500 | int i, err, nx_cur = 0, nx_new = 0; | |
2501 | struct xfrm_policy *pol = NULL; | |
2502 | struct xfrm_state *x, *xc; | |
2503 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2504 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2505 | struct xfrm_migrate *mp; | |
2506 | ||
2507 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2508 | goto out; | |
2509 | ||
2510 | /* Stage 1 - find policy */ | |
2511 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2512 | err = -ENOENT; | |
2513 | goto out; | |
2514 | } | |
2515 | ||
2516 | /* Stage 2 - find and update state(s) */ | |
2517 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2518 | if ((x = xfrm_migrate_state_find(mp))) { | |
2519 | x_cur[nx_cur] = x; | |
2520 | nx_cur++; | |
2521 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2522 | x_new[nx_new] = xc; | |
2523 | nx_new++; | |
2524 | } else { | |
2525 | err = -ENODATA; | |
2526 | goto restore_state; | |
2527 | } | |
2528 | } | |
2529 | } | |
2530 | ||
2531 | /* Stage 3 - update policy */ | |
2532 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2533 | goto restore_state; | |
2534 | ||
2535 | /* Stage 4 - delete old state(s) */ | |
2536 | if (nx_cur) { | |
2537 | xfrm_states_put(x_cur, nx_cur); | |
2538 | xfrm_states_delete(x_cur, nx_cur); | |
2539 | } | |
2540 | ||
2541 | /* Stage 5 - announce */ | |
2542 | km_migrate(sel, dir, type, m, num_migrate); | |
2543 | ||
2544 | xfrm_pol_put(pol); | |
2545 | ||
2546 | return 0; | |
2547 | out: | |
2548 | return err; | |
2549 | ||
2550 | restore_state: | |
2551 | if (pol) | |
2552 | xfrm_pol_put(pol); | |
2553 | if (nx_cur) | |
2554 | xfrm_states_put(x_cur, nx_cur); | |
2555 | if (nx_new) | |
2556 | xfrm_states_delete(x_new, nx_new); | |
2557 | ||
2558 | return err; | |
2559 | } | |
e610e679 | 2560 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2561 | #endif |