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> |
68277acc | 27 | #include <linux/audit.h> |
25ee3286 | 28 | #include <net/dst.h> |
1da177e4 LT |
29 | #include <net/xfrm.h> |
30 | #include <net/ip.h> | |
558f82ef MN |
31 | #ifdef CONFIG_XFRM_STATISTICS |
32 | #include <net/snmp.h> | |
33 | #endif | |
1da177e4 | 34 | |
44e36b42 DM |
35 | #include "xfrm_hash.h" |
36 | ||
4a3e2f71 AV |
37 | DEFINE_MUTEX(xfrm_cfg_mutex); |
38 | EXPORT_SYMBOL(xfrm_cfg_mutex); | |
1da177e4 LT |
39 | |
40 | static DEFINE_RWLOCK(xfrm_policy_lock); | |
41 | ||
1da177e4 LT |
42 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); |
43 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
44 | ||
e18b890b | 45 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 | 46 | |
2518c7c2 | 47 | static HLIST_HEAD(xfrm_policy_gc_list); |
1da177e4 LT |
48 | static DEFINE_SPINLOCK(xfrm_policy_gc_lock); |
49 | ||
50 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); | |
51 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
25ee3286 | 52 | static void xfrm_init_pmtu(struct dst_entry *dst); |
1da177e4 | 53 | |
29fa0b30 WY |
54 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
55 | int dir); | |
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 | ||
c5b3cf46 | 91 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
9bb182a7 YH |
92 | xfrm_address_t *saddr, |
93 | xfrm_address_t *daddr, | |
94 | int family) | |
95 | { | |
96 | struct xfrm_policy_afinfo *afinfo; | |
97 | struct dst_entry *dst; | |
98 | ||
99 | afinfo = xfrm_policy_get_afinfo(family); | |
100 | if (unlikely(afinfo == NULL)) | |
101 | return ERR_PTR(-EAFNOSUPPORT); | |
102 | ||
c5b3cf46 | 103 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); |
9bb182a7 YH |
104 | |
105 | xfrm_policy_put_afinfo(afinfo); | |
106 | ||
107 | return dst; | |
108 | } | |
109 | ||
25ee3286 | 110 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
111 | xfrm_address_t *prev_saddr, |
112 | xfrm_address_t *prev_daddr, | |
25ee3286 | 113 | int family) |
1da177e4 | 114 | { |
c5b3cf46 | 115 | struct net *net = xs_net(x); |
66cdb3ca HX |
116 | xfrm_address_t *saddr = &x->props.saddr; |
117 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
118 | struct dst_entry *dst; |
119 | ||
9bb182a7 | 120 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 121 | saddr = x->coaddr; |
9bb182a7 YH |
122 | daddr = prev_daddr; |
123 | } | |
124 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
125 | saddr = prev_saddr; | |
66cdb3ca | 126 | daddr = x->coaddr; |
9bb182a7 | 127 | } |
1da177e4 | 128 | |
c5b3cf46 | 129 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); |
9bb182a7 YH |
130 | |
131 | if (!IS_ERR(dst)) { | |
132 | if (prev_saddr != saddr) | |
133 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
134 | if (prev_daddr != daddr) | |
135 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
136 | } | |
1da177e4 | 137 | |
66cdb3ca | 138 | return dst; |
1da177e4 | 139 | } |
1da177e4 | 140 | |
1da177e4 LT |
141 | static inline unsigned long make_jiffies(long secs) |
142 | { | |
143 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
144 | return MAX_SCHEDULE_TIMEOUT-1; | |
145 | else | |
a716c119 | 146 | return secs*HZ; |
1da177e4 LT |
147 | } |
148 | ||
149 | static void xfrm_policy_timer(unsigned long data) | |
150 | { | |
151 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 152 | unsigned long now = get_seconds(); |
1da177e4 LT |
153 | long next = LONG_MAX; |
154 | int warn = 0; | |
155 | int dir; | |
156 | ||
157 | read_lock(&xp->lock); | |
158 | ||
12a169e7 | 159 | if (xp->walk.dead) |
1da177e4 LT |
160 | goto out; |
161 | ||
77d8d7a6 | 162 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
163 | |
164 | if (xp->lft.hard_add_expires_seconds) { | |
165 | long tmo = xp->lft.hard_add_expires_seconds + | |
166 | xp->curlft.add_time - now; | |
167 | if (tmo <= 0) | |
168 | goto expired; | |
169 | if (tmo < next) | |
170 | next = tmo; | |
171 | } | |
172 | if (xp->lft.hard_use_expires_seconds) { | |
173 | long tmo = xp->lft.hard_use_expires_seconds + | |
174 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
175 | if (tmo <= 0) | |
176 | goto expired; | |
177 | if (tmo < next) | |
178 | next = tmo; | |
179 | } | |
180 | if (xp->lft.soft_add_expires_seconds) { | |
181 | long tmo = xp->lft.soft_add_expires_seconds + | |
182 | xp->curlft.add_time - now; | |
183 | if (tmo <= 0) { | |
184 | warn = 1; | |
185 | tmo = XFRM_KM_TIMEOUT; | |
186 | } | |
187 | if (tmo < next) | |
188 | next = tmo; | |
189 | } | |
190 | if (xp->lft.soft_use_expires_seconds) { | |
191 | long tmo = xp->lft.soft_use_expires_seconds + | |
192 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
193 | if (tmo <= 0) { | |
194 | warn = 1; | |
195 | tmo = XFRM_KM_TIMEOUT; | |
196 | } | |
197 | if (tmo < next) | |
198 | next = tmo; | |
199 | } | |
200 | ||
201 | if (warn) | |
6c5c8ca7 | 202 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
203 | if (next != LONG_MAX && |
204 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
205 | xfrm_pol_hold(xp); | |
206 | ||
207 | out: | |
208 | read_unlock(&xp->lock); | |
209 | xfrm_pol_put(xp); | |
210 | return; | |
211 | ||
212 | expired: | |
213 | read_unlock(&xp->lock); | |
4666faab | 214 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 215 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
216 | xfrm_pol_put(xp); |
217 | } | |
218 | ||
219 | ||
220 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
221 | * SPD calls. | |
222 | */ | |
223 | ||
0331b1f3 | 224 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
225 | { |
226 | struct xfrm_policy *policy; | |
227 | ||
0da974f4 | 228 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
229 | |
230 | if (policy) { | |
0331b1f3 | 231 | write_pnet(&policy->xp_net, net); |
12a169e7 | 232 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
233 | INIT_HLIST_NODE(&policy->bydst); |
234 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 235 | rwlock_init(&policy->lock); |
2518c7c2 | 236 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
237 | setup_timer(&policy->timer, xfrm_policy_timer, |
238 | (unsigned long)policy); | |
1da177e4 LT |
239 | } |
240 | return policy; | |
241 | } | |
242 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
243 | ||
244 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
245 | ||
64c31b3f | 246 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 247 | { |
12a169e7 | 248 | BUG_ON(!policy->walk.dead); |
1da177e4 | 249 | |
09a62660 | 250 | BUG_ON(policy->bundles); |
1da177e4 LT |
251 | |
252 | if (del_timer(&policy->timer)) | |
253 | BUG(); | |
254 | ||
03e1ad7b | 255 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
256 | kfree(policy); |
257 | } | |
64c31b3f | 258 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 LT |
259 | |
260 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
261 | { | |
262 | struct dst_entry *dst; | |
263 | ||
264 | while ((dst = policy->bundles) != NULL) { | |
265 | policy->bundles = dst->next; | |
266 | dst_free(dst); | |
267 | } | |
268 | ||
269 | if (del_timer(&policy->timer)) | |
270 | atomic_dec(&policy->refcnt); | |
271 | ||
272 | if (atomic_read(&policy->refcnt) > 1) | |
273 | flow_cache_flush(); | |
274 | ||
275 | xfrm_pol_put(policy); | |
276 | } | |
277 | ||
c4028958 | 278 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
279 | { |
280 | struct xfrm_policy *policy; | |
2518c7c2 DM |
281 | struct hlist_node *entry, *tmp; |
282 | struct hlist_head gc_list; | |
1da177e4 LT |
283 | |
284 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
285 | gc_list.first = xfrm_policy_gc_list.first; |
286 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
287 | spin_unlock_bh(&xfrm_policy_gc_lock); |
288 | ||
2518c7c2 | 289 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 290 | xfrm_policy_gc_kill(policy); |
1da177e4 | 291 | } |
c9583969 | 292 | static DECLARE_WORK(xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
293 | |
294 | /* Rule must be locked. Release descentant resources, announce | |
295 | * entry dead. The rule must be unlinked from lists to the moment. | |
296 | */ | |
297 | ||
298 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
299 | { | |
300 | int dead; | |
301 | ||
302 | write_lock_bh(&policy->lock); | |
12a169e7 HX |
303 | dead = policy->walk.dead; |
304 | policy->walk.dead = 1; | |
1da177e4 LT |
305 | write_unlock_bh(&policy->lock); |
306 | ||
307 | if (unlikely(dead)) { | |
308 | WARN_ON(1); | |
309 | return; | |
310 | } | |
311 | ||
bbb770e7 | 312 | spin_lock_bh(&xfrm_policy_gc_lock); |
2518c7c2 | 313 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
bbb770e7 | 314 | spin_unlock_bh(&xfrm_policy_gc_lock); |
1da177e4 LT |
315 | |
316 | schedule_work(&xfrm_policy_gc_work); | |
317 | } | |
318 | ||
2518c7c2 DM |
319 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
320 | ||
e92303f8 | 321 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 322 | { |
e92303f8 | 323 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
324 | } |
325 | ||
1121994c | 326 | static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir) |
2518c7c2 | 327 | { |
1121994c | 328 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
329 | unsigned int hash = __sel_hash(sel, family, hmask); |
330 | ||
331 | return (hash == hmask + 1 ? | |
1121994c AD |
332 | &net->xfrm.policy_inexact[dir] : |
333 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
334 | } |
335 | ||
1121994c | 336 | static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) |
2518c7c2 | 337 | { |
1121994c | 338 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
339 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
340 | ||
1121994c | 341 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
342 | } |
343 | ||
2518c7c2 DM |
344 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
345 | struct hlist_head *ndsttable, | |
346 | unsigned int nhashmask) | |
347 | { | |
b791160b | 348 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 349 | struct xfrm_policy *pol; |
b791160b | 350 | unsigned int h0 = 0; |
2518c7c2 | 351 | |
b791160b | 352 | redo: |
2518c7c2 DM |
353 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
354 | unsigned int h; | |
355 | ||
356 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
357 | pol->family, nhashmask); | |
b791160b YH |
358 | if (!entry0) { |
359 | hlist_del(entry); | |
360 | hlist_add_head(&pol->bydst, ndsttable+h); | |
361 | h0 = h; | |
362 | } else { | |
363 | if (h != h0) | |
364 | continue; | |
365 | hlist_del(entry); | |
366 | hlist_add_after(entry0, &pol->bydst); | |
367 | } | |
368 | entry0 = entry; | |
369 | } | |
370 | if (!hlist_empty(list)) { | |
371 | entry0 = NULL; | |
372 | goto redo; | |
2518c7c2 DM |
373 | } |
374 | } | |
375 | ||
376 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
377 | struct hlist_head *nidxtable, | |
378 | unsigned int nhashmask) | |
379 | { | |
380 | struct hlist_node *entry, *tmp; | |
381 | struct xfrm_policy *pol; | |
382 | ||
383 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
384 | unsigned int h; | |
385 | ||
386 | h = __idx_hash(pol->index, nhashmask); | |
387 | hlist_add_head(&pol->byidx, nidxtable+h); | |
388 | } | |
389 | } | |
390 | ||
391 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
392 | { | |
393 | return ((old_hmask + 1) << 1) - 1; | |
394 | } | |
395 | ||
66caf628 | 396 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 397 | { |
66caf628 | 398 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
399 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
400 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 401 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 402 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
403 | int i; |
404 | ||
405 | if (!ndst) | |
406 | return; | |
407 | ||
408 | write_lock_bh(&xfrm_policy_lock); | |
409 | ||
410 | for (i = hmask; i >= 0; i--) | |
411 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
412 | ||
66caf628 AD |
413 | net->xfrm.policy_bydst[dir].table = ndst; |
414 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 DM |
415 | |
416 | write_unlock_bh(&xfrm_policy_lock); | |
417 | ||
44e36b42 | 418 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
419 | } |
420 | ||
66caf628 | 421 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 422 | { |
66caf628 | 423 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
424 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
425 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 426 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 427 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
428 | int i; |
429 | ||
430 | if (!nidx) | |
431 | return; | |
432 | ||
433 | write_lock_bh(&xfrm_policy_lock); | |
434 | ||
435 | for (i = hmask; i >= 0; i--) | |
436 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
437 | ||
66caf628 AD |
438 | net->xfrm.policy_byidx = nidx; |
439 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 DM |
440 | |
441 | write_unlock_bh(&xfrm_policy_lock); | |
442 | ||
44e36b42 | 443 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
444 | } |
445 | ||
66caf628 | 446 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 447 | { |
66caf628 AD |
448 | unsigned int cnt = net->xfrm.policy_count[dir]; |
449 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
450 | |
451 | if (total) | |
452 | *total += cnt; | |
453 | ||
454 | if ((hmask + 1) < xfrm_policy_hashmax && | |
455 | cnt > hmask) | |
456 | return 1; | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
66caf628 | 461 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 462 | { |
66caf628 | 463 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
464 | |
465 | if ((hmask + 1) < xfrm_policy_hashmax && | |
466 | total > hmask) | |
467 | return 1; | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
e071041b | 472 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
473 | { |
474 | read_lock_bh(&xfrm_policy_lock); | |
e071041b AD |
475 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
476 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
477 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
478 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
479 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
480 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
481 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 JHS |
482 | si->spdhmcnt = xfrm_policy_hashmax; |
483 | read_unlock_bh(&xfrm_policy_lock); | |
484 | } | |
485 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 486 | |
ecfd6b18 | 487 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 488 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 489 | { |
66caf628 | 490 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
491 | int dir, total; |
492 | ||
493 | mutex_lock(&hash_resize_mutex); | |
494 | ||
495 | total = 0; | |
496 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
497 | if (xfrm_bydst_should_resize(net, dir, &total)) |
498 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 499 | } |
66caf628 AD |
500 | if (xfrm_byidx_should_resize(net, total)) |
501 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
502 | |
503 | mutex_unlock(&hash_resize_mutex); | |
504 | } | |
505 | ||
1da177e4 LT |
506 | /* Generate new index... KAME seems to generate them ordered by cost |
507 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
1121994c | 508 | static u32 xfrm_gen_index(struct net *net, int dir) |
1da177e4 | 509 | { |
1da177e4 LT |
510 | static u32 idx_generator; |
511 | ||
512 | for (;;) { | |
2518c7c2 DM |
513 | struct hlist_node *entry; |
514 | struct hlist_head *list; | |
515 | struct xfrm_policy *p; | |
516 | u32 idx; | |
517 | int found; | |
518 | ||
1da177e4 LT |
519 | idx = (idx_generator | dir); |
520 | idx_generator += 8; | |
521 | if (idx == 0) | |
522 | idx = 8; | |
1121994c | 523 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 DM |
524 | found = 0; |
525 | hlist_for_each_entry(p, entry, list, byidx) { | |
526 | if (p->index == idx) { | |
527 | found = 1; | |
1da177e4 | 528 | break; |
2518c7c2 | 529 | } |
1da177e4 | 530 | } |
2518c7c2 | 531 | if (!found) |
1da177e4 LT |
532 | return idx; |
533 | } | |
534 | } | |
535 | ||
2518c7c2 DM |
536 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
537 | { | |
538 | u32 *p1 = (u32 *) s1; | |
539 | u32 *p2 = (u32 *) s2; | |
540 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
541 | int i; | |
542 | ||
543 | for (i = 0; i < len; i++) { | |
544 | if (p1[i] != p2[i]) | |
545 | return 1; | |
546 | } | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
1da177e4 LT |
551 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
552 | { | |
1121994c | 553 | struct net *net = xp_net(policy); |
2518c7c2 DM |
554 | struct xfrm_policy *pol; |
555 | struct xfrm_policy *delpol; | |
556 | struct hlist_head *chain; | |
a6c7ab55 | 557 | struct hlist_node *entry, *newpos; |
9b78a82c | 558 | struct dst_entry *gc_list; |
1da177e4 LT |
559 | |
560 | write_lock_bh(&xfrm_policy_lock); | |
1121994c | 561 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
562 | delpol = NULL; |
563 | newpos = NULL; | |
2518c7c2 | 564 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 565 | if (pol->type == policy->type && |
2518c7c2 | 566 | !selector_cmp(&pol->selector, &policy->selector) && |
a6c7ab55 HX |
567 | xfrm_sec_ctx_match(pol->security, policy->security) && |
568 | !WARN_ON(delpol)) { | |
1da177e4 LT |
569 | if (excl) { |
570 | write_unlock_bh(&xfrm_policy_lock); | |
571 | return -EEXIST; | |
572 | } | |
1da177e4 LT |
573 | delpol = pol; |
574 | if (policy->priority > pol->priority) | |
575 | continue; | |
576 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 577 | newpos = &pol->bydst; |
1da177e4 LT |
578 | continue; |
579 | } | |
1da177e4 LT |
580 | if (delpol) |
581 | break; | |
1da177e4 LT |
582 | } |
583 | if (newpos) | |
2518c7c2 DM |
584 | hlist_add_after(newpos, &policy->bydst); |
585 | else | |
586 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 587 | xfrm_pol_hold(policy); |
1121994c | 588 | net->xfrm.policy_count[dir]++; |
1da177e4 | 589 | atomic_inc(&flow_cache_genid); |
29fa0b30 WY |
590 | if (delpol) |
591 | __xfrm_policy_unlink(delpol, dir); | |
1121994c AD |
592 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
593 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); | |
9d729f72 | 594 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
595 | policy->curlft.use_time = 0; |
596 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
597 | xfrm_pol_hold(policy); | |
1121994c | 598 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
1da177e4 LT |
599 | write_unlock_bh(&xfrm_policy_lock); |
600 | ||
9b78a82c | 601 | if (delpol) |
1da177e4 | 602 | xfrm_policy_kill(delpol); |
1121994c AD |
603 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
604 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c DM |
605 | |
606 | read_lock_bh(&xfrm_policy_lock); | |
607 | gc_list = NULL; | |
2518c7c2 DM |
608 | entry = &policy->bydst; |
609 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
610 | struct dst_entry *dst; |
611 | ||
612 | write_lock(&policy->lock); | |
613 | dst = policy->bundles; | |
614 | if (dst) { | |
615 | struct dst_entry *tail = dst; | |
616 | while (tail->next) | |
617 | tail = tail->next; | |
618 | tail->next = gc_list; | |
619 | gc_list = dst; | |
620 | ||
621 | policy->bundles = NULL; | |
622 | } | |
623 | write_unlock(&policy->lock); | |
1da177e4 | 624 | } |
9b78a82c DM |
625 | read_unlock_bh(&xfrm_policy_lock); |
626 | ||
627 | while (gc_list) { | |
628 | struct dst_entry *dst = gc_list; | |
629 | ||
630 | gc_list = dst->next; | |
631 | dst_free(dst); | |
632 | } | |
633 | ||
1da177e4 LT |
634 | return 0; |
635 | } | |
636 | EXPORT_SYMBOL(xfrm_policy_insert); | |
637 | ||
8d1211a6 | 638 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir, |
4e81bb83 | 639 | struct xfrm_selector *sel, |
ef41aaa0 EP |
640 | struct xfrm_sec_ctx *ctx, int delete, |
641 | int *err) | |
1da177e4 | 642 | { |
2518c7c2 DM |
643 | struct xfrm_policy *pol, *ret; |
644 | struct hlist_head *chain; | |
645 | struct hlist_node *entry; | |
1da177e4 | 646 | |
ef41aaa0 | 647 | *err = 0; |
1da177e4 | 648 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 649 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 DM |
650 | ret = NULL; |
651 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
652 | if (pol->type == type && | |
653 | !selector_cmp(sel, &pol->selector) && | |
654 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 655 | xfrm_pol_hold(pol); |
2518c7c2 | 656 | if (delete) { |
03e1ad7b PM |
657 | *err = security_xfrm_policy_delete( |
658 | pol->security); | |
ef41aaa0 EP |
659 | if (*err) { |
660 | write_unlock_bh(&xfrm_policy_lock); | |
661 | return pol; | |
662 | } | |
29fa0b30 | 663 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
664 | } |
665 | ret = pol; | |
1da177e4 LT |
666 | break; |
667 | } | |
668 | } | |
669 | write_unlock_bh(&xfrm_policy_lock); | |
670 | ||
2518c7c2 | 671 | if (ret && delete) { |
1da177e4 | 672 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 673 | xfrm_policy_kill(ret); |
1da177e4 | 674 | } |
2518c7c2 | 675 | return ret; |
1da177e4 | 676 | } |
df71837d | 677 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 678 | |
8d1211a6 AD |
679 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u8 type, int dir, u32 id, |
680 | int delete, int *err) | |
1da177e4 | 681 | { |
2518c7c2 DM |
682 | struct xfrm_policy *pol, *ret; |
683 | struct hlist_head *chain; | |
684 | struct hlist_node *entry; | |
1da177e4 | 685 | |
b5505c6e HX |
686 | *err = -ENOENT; |
687 | if (xfrm_policy_id2dir(id) != dir) | |
688 | return NULL; | |
689 | ||
ef41aaa0 | 690 | *err = 0; |
1da177e4 | 691 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 692 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 DM |
693 | ret = NULL; |
694 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
695 | if (pol->type == type && pol->index == id) { | |
1da177e4 | 696 | xfrm_pol_hold(pol); |
2518c7c2 | 697 | if (delete) { |
03e1ad7b PM |
698 | *err = security_xfrm_policy_delete( |
699 | pol->security); | |
ef41aaa0 EP |
700 | if (*err) { |
701 | write_unlock_bh(&xfrm_policy_lock); | |
702 | return pol; | |
703 | } | |
29fa0b30 | 704 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
705 | } |
706 | ret = pol; | |
1da177e4 LT |
707 | break; |
708 | } | |
709 | } | |
710 | write_unlock_bh(&xfrm_policy_lock); | |
711 | ||
2518c7c2 | 712 | if (ret && delete) { |
1da177e4 | 713 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 714 | xfrm_policy_kill(ret); |
1da177e4 | 715 | } |
2518c7c2 | 716 | return ret; |
1da177e4 LT |
717 | } |
718 | EXPORT_SYMBOL(xfrm_policy_byid); | |
719 | ||
4aa2e62c JL |
720 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
721 | static inline int | |
33ffbbd5 | 722 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 723 | { |
4aa2e62c JL |
724 | int dir, err = 0; |
725 | ||
726 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
727 | struct xfrm_policy *pol; | |
728 | struct hlist_node *entry; | |
729 | int i; | |
730 | ||
731 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 732 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
733 | if (pol->type != type) |
734 | continue; | |
03e1ad7b | 735 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 736 | if (err) { |
ab5f5e8b JL |
737 | xfrm_audit_policy_delete(pol, 0, |
738 | audit_info->loginuid, | |
2532386f | 739 | audit_info->sessionid, |
ab5f5e8b | 740 | audit_info->secid); |
4aa2e62c JL |
741 | return err; |
742 | } | |
7dc12d6d | 743 | } |
33ffbbd5 | 744 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
4aa2e62c | 745 | hlist_for_each_entry(pol, entry, |
33ffbbd5 | 746 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
747 | bydst) { |
748 | if (pol->type != type) | |
749 | continue; | |
03e1ad7b PM |
750 | err = security_xfrm_policy_delete( |
751 | pol->security); | |
4aa2e62c | 752 | if (err) { |
ab5f5e8b JL |
753 | xfrm_audit_policy_delete(pol, 0, |
754 | audit_info->loginuid, | |
2532386f | 755 | audit_info->sessionid, |
ab5f5e8b | 756 | audit_info->secid); |
4aa2e62c JL |
757 | return err; |
758 | } | |
759 | } | |
760 | } | |
761 | } | |
762 | return err; | |
763 | } | |
764 | #else | |
765 | static inline int | |
33ffbbd5 | 766 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
767 | { |
768 | return 0; | |
769 | } | |
770 | #endif | |
771 | ||
33ffbbd5 | 772 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c | 773 | { |
069c474e | 774 | int dir, err = 0; |
1da177e4 LT |
775 | |
776 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c | 777 | |
33ffbbd5 | 778 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
779 | if (err) |
780 | goto out; | |
781 | ||
1da177e4 | 782 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
783 | struct xfrm_policy *pol; |
784 | struct hlist_node *entry; | |
29fa0b30 | 785 | int i; |
2518c7c2 DM |
786 | |
787 | again1: | |
788 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 789 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
790 | if (pol->type != type) |
791 | continue; | |
069c474e | 792 | __xfrm_policy_unlink(pol, dir); |
1da177e4 LT |
793 | write_unlock_bh(&xfrm_policy_lock); |
794 | ||
ab5f5e8b | 795 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 796 | audit_info->sessionid, |
ab5f5e8b | 797 | audit_info->secid); |
161a09e7 | 798 | |
2518c7c2 | 799 | xfrm_policy_kill(pol); |
1da177e4 LT |
800 | |
801 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
802 | goto again1; |
803 | } | |
804 | ||
33ffbbd5 | 805 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 DM |
806 | again2: |
807 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 808 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
809 | bydst) { |
810 | if (pol->type != type) | |
811 | continue; | |
069c474e | 812 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
813 | write_unlock_bh(&xfrm_policy_lock); |
814 | ||
ab5f5e8b JL |
815 | xfrm_audit_policy_delete(pol, 1, |
816 | audit_info->loginuid, | |
2532386f | 817 | audit_info->sessionid, |
ab5f5e8b | 818 | audit_info->secid); |
2518c7c2 DM |
819 | xfrm_policy_kill(pol); |
820 | ||
821 | write_lock_bh(&xfrm_policy_lock); | |
822 | goto again2; | |
823 | } | |
1da177e4 | 824 | } |
2518c7c2 | 825 | |
1da177e4 LT |
826 | } |
827 | atomic_inc(&flow_cache_genid); | |
4aa2e62c | 828 | out: |
1da177e4 | 829 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 830 | return err; |
1da177e4 LT |
831 | } |
832 | EXPORT_SYMBOL(xfrm_policy_flush); | |
833 | ||
cdcbca7c | 834 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 835 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
836 | void *data) |
837 | { | |
12a169e7 HX |
838 | struct xfrm_policy *pol; |
839 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
840 | int error = 0; |
841 | ||
842 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
843 | walk->type != XFRM_POLICY_TYPE_ANY) | |
844 | return -EINVAL; | |
1da177e4 | 845 | |
12a169e7 | 846 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
847 | return 0; |
848 | ||
12a169e7 HX |
849 | write_lock_bh(&xfrm_policy_lock); |
850 | if (list_empty(&walk->walk.all)) | |
cdcbca7c | 851 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
852 | else |
853 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 854 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 855 | if (x->dead) |
4c563f76 | 856 | continue; |
12a169e7 HX |
857 | pol = container_of(x, struct xfrm_policy, walk); |
858 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
859 | walk->type != pol->type) | |
860 | continue; | |
861 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
862 | walk->seq, data); | |
863 | if (error) { | |
864 | list_move_tail(&walk->walk.all, &x->all); | |
865 | goto out; | |
2518c7c2 | 866 | } |
12a169e7 | 867 | walk->seq++; |
1da177e4 | 868 | } |
12a169e7 | 869 | if (walk->seq == 0) { |
baf5d743 JHS |
870 | error = -ENOENT; |
871 | goto out; | |
872 | } | |
12a169e7 | 873 | list_del_init(&walk->walk.all); |
1da177e4 | 874 | out: |
12a169e7 | 875 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
876 | return error; |
877 | } | |
878 | EXPORT_SYMBOL(xfrm_policy_walk); | |
879 | ||
12a169e7 HX |
880 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
881 | { | |
882 | INIT_LIST_HEAD(&walk->walk.all); | |
883 | walk->walk.dead = 1; | |
884 | walk->type = type; | |
885 | walk->seq = 0; | |
886 | } | |
887 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
888 | ||
889 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
890 | { | |
891 | if (list_empty(&walk->walk.all)) | |
892 | return; | |
893 | ||
894 | write_lock_bh(&xfrm_policy_lock); | |
895 | list_del(&walk->walk.all); | |
896 | write_unlock_bh(&xfrm_policy_lock); | |
897 | } | |
898 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
899 | ||
134b0fc5 JM |
900 | /* |
901 | * Find policy to apply to this flow. | |
902 | * | |
903 | * Returns 0 if policy found, else an -errno. | |
904 | */ | |
2518c7c2 DM |
905 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
906 | u8 type, u16 family, int dir) | |
1da177e4 | 907 | { |
2518c7c2 | 908 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 909 | int match, ret = -ESRCH; |
1da177e4 | 910 | |
2518c7c2 DM |
911 | if (pol->family != family || |
912 | pol->type != type) | |
134b0fc5 | 913 | return ret; |
1da177e4 | 914 | |
2518c7c2 | 915 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 916 | if (match) |
03e1ad7b PM |
917 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
918 | dir); | |
2518c7c2 | 919 | |
134b0fc5 | 920 | return ret; |
2518c7c2 | 921 | } |
1da177e4 | 922 | |
52479b62 AD |
923 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
924 | struct flowi *fl, | |
2518c7c2 DM |
925 | u16 family, u8 dir) |
926 | { | |
134b0fc5 | 927 | int err; |
2518c7c2 DM |
928 | struct xfrm_policy *pol, *ret; |
929 | xfrm_address_t *daddr, *saddr; | |
930 | struct hlist_node *entry; | |
931 | struct hlist_head *chain; | |
acba48e1 | 932 | u32 priority = ~0U; |
df71837d | 933 | |
2518c7c2 DM |
934 | daddr = xfrm_flowi_daddr(fl, family); |
935 | saddr = xfrm_flowi_saddr(fl, family); | |
936 | if (unlikely(!daddr || !saddr)) | |
937 | return NULL; | |
938 | ||
939 | read_lock_bh(&xfrm_policy_lock); | |
52479b62 | 940 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 DM |
941 | ret = NULL; |
942 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
943 | err = xfrm_policy_match(pol, fl, type, family, dir); |
944 | if (err) { | |
945 | if (err == -ESRCH) | |
946 | continue; | |
947 | else { | |
948 | ret = ERR_PTR(err); | |
949 | goto fail; | |
950 | } | |
951 | } else { | |
2518c7c2 | 952 | ret = pol; |
acba48e1 | 953 | priority = ret->priority; |
2518c7c2 DM |
954 | break; |
955 | } | |
956 | } | |
52479b62 | 957 | chain = &net->xfrm.policy_inexact[dir]; |
acba48e1 | 958 | hlist_for_each_entry(pol, entry, chain, bydst) { |
134b0fc5 JM |
959 | err = xfrm_policy_match(pol, fl, type, family, dir); |
960 | if (err) { | |
961 | if (err == -ESRCH) | |
962 | continue; | |
963 | else { | |
964 | ret = ERR_PTR(err); | |
965 | goto fail; | |
966 | } | |
967 | } else if (pol->priority < priority) { | |
acba48e1 DM |
968 | ret = pol; |
969 | break; | |
1da177e4 LT |
970 | } |
971 | } | |
acba48e1 DM |
972 | if (ret) |
973 | xfrm_pol_hold(ret); | |
134b0fc5 | 974 | fail: |
1da177e4 | 975 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 976 | |
2518c7c2 | 977 | return ret; |
4e81bb83 MN |
978 | } |
979 | ||
52479b62 AD |
980 | static int xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, |
981 | u8 dir, void **objp, atomic_t **obj_refp) | |
4e81bb83 MN |
982 | { |
983 | struct xfrm_policy *pol; | |
134b0fc5 | 984 | int err = 0; |
4e81bb83 MN |
985 | |
986 | #ifdef CONFIG_XFRM_SUB_POLICY | |
52479b62 | 987 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); |
134b0fc5 JM |
988 | if (IS_ERR(pol)) { |
989 | err = PTR_ERR(pol); | |
990 | pol = NULL; | |
991 | } | |
992 | if (pol || err) | |
4e81bb83 MN |
993 | goto end; |
994 | #endif | |
52479b62 | 995 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); |
134b0fc5 JM |
996 | if (IS_ERR(pol)) { |
997 | err = PTR_ERR(pol); | |
998 | pol = NULL; | |
999 | } | |
4e81bb83 | 1000 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1001 | end: |
4e81bb83 | 1002 | #endif |
1da177e4 LT |
1003 | if ((*objp = (void *) pol) != NULL) |
1004 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1005 | return err; |
1da177e4 LT |
1006 | } |
1007 | ||
df71837d TJ |
1008 | static inline int policy_to_flow_dir(int dir) |
1009 | { | |
1010 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1011 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1012 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1013 | return dir; | |
1014 | switch (dir) { | |
1015 | default: | |
1016 | case XFRM_POLICY_IN: | |
1017 | return FLOW_DIR_IN; | |
1018 | case XFRM_POLICY_OUT: | |
1019 | return FLOW_DIR_OUT; | |
1020 | case XFRM_POLICY_FWD: | |
1021 | return FLOW_DIR_FWD; | |
3ff50b79 | 1022 | } |
df71837d TJ |
1023 | } |
1024 | ||
e0d1caa7 | 1025 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1026 | { |
1027 | struct xfrm_policy *pol; | |
1028 | ||
1029 | read_lock_bh(&xfrm_policy_lock); | |
1030 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1031 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1032 | sk->sk_family); |
a716c119 | 1033 | int err = 0; |
df71837d | 1034 | |
3bccfbc7 | 1035 | if (match) { |
03e1ad7b PM |
1036 | err = security_xfrm_policy_lookup(pol->security, |
1037 | fl->secid, | |
1038 | policy_to_flow_dir(dir)); | |
3bccfbc7 VY |
1039 | if (!err) |
1040 | xfrm_pol_hold(pol); | |
1041 | else if (err == -ESRCH) | |
1042 | pol = NULL; | |
1043 | else | |
1044 | pol = ERR_PTR(err); | |
1045 | } else | |
1da177e4 LT |
1046 | pol = NULL; |
1047 | } | |
1048 | read_unlock_bh(&xfrm_policy_lock); | |
1049 | return pol; | |
1050 | } | |
1051 | ||
1052 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1053 | { | |
98806f75 | 1054 | struct net *net = xp_net(pol); |
1121994c | 1055 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1056 | pol->family, dir); |
4e81bb83 | 1057 | |
98806f75 | 1058 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1059 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1060 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1061 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1062 | xfrm_pol_hold(pol); |
2518c7c2 | 1063 | |
98806f75 AD |
1064 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1065 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1066 | } |
1067 | ||
1068 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1069 | int dir) | |
1070 | { | |
98806f75 AD |
1071 | struct net *net = xp_net(pol); |
1072 | ||
2518c7c2 DM |
1073 | if (hlist_unhashed(&pol->bydst)) |
1074 | return NULL; | |
1da177e4 | 1075 | |
2518c7c2 DM |
1076 | hlist_del(&pol->bydst); |
1077 | hlist_del(&pol->byidx); | |
12a169e7 | 1078 | list_del(&pol->walk.all); |
98806f75 | 1079 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1080 | |
1081 | return pol; | |
1da177e4 LT |
1082 | } |
1083 | ||
4666faab | 1084 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1085 | { |
1086 | write_lock_bh(&xfrm_policy_lock); | |
1087 | pol = __xfrm_policy_unlink(pol, dir); | |
1088 | write_unlock_bh(&xfrm_policy_lock); | |
1089 | if (pol) { | |
1090 | if (dir < XFRM_POLICY_MAX) | |
1091 | atomic_inc(&flow_cache_genid); | |
1092 | xfrm_policy_kill(pol); | |
4666faab | 1093 | return 0; |
1da177e4 | 1094 | } |
4666faab | 1095 | return -ENOENT; |
1da177e4 | 1096 | } |
a70fcb0b | 1097 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1098 | |
1099 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1100 | { | |
1121994c | 1101 | struct net *net = xp_net(pol); |
1da177e4 LT |
1102 | struct xfrm_policy *old_pol; |
1103 | ||
4e81bb83 MN |
1104 | #ifdef CONFIG_XFRM_SUB_POLICY |
1105 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1106 | return -EINVAL; | |
1107 | #endif | |
1108 | ||
1da177e4 LT |
1109 | write_lock_bh(&xfrm_policy_lock); |
1110 | old_pol = sk->sk_policy[dir]; | |
1111 | sk->sk_policy[dir] = pol; | |
1112 | if (pol) { | |
9d729f72 | 1113 | pol->curlft.add_time = get_seconds(); |
1121994c | 1114 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1115 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1116 | } | |
1117 | if (old_pol) | |
1118 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1119 | write_unlock_bh(&xfrm_policy_lock); | |
1120 | ||
1121 | if (old_pol) { | |
1122 | xfrm_policy_kill(old_pol); | |
1123 | } | |
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1128 | { | |
0331b1f3 | 1129 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1130 | |
1131 | if (newp) { | |
1132 | newp->selector = old->selector; | |
03e1ad7b PM |
1133 | if (security_xfrm_policy_clone(old->security, |
1134 | &newp->security)) { | |
df71837d TJ |
1135 | kfree(newp); |
1136 | return NULL; /* ENOMEM */ | |
1137 | } | |
1da177e4 LT |
1138 | newp->lft = old->lft; |
1139 | newp->curlft = old->curlft; | |
1140 | newp->action = old->action; | |
1141 | newp->flags = old->flags; | |
1142 | newp->xfrm_nr = old->xfrm_nr; | |
1143 | newp->index = old->index; | |
4e81bb83 | 1144 | newp->type = old->type; |
1da177e4 LT |
1145 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1146 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1147 | write_lock_bh(&xfrm_policy_lock); | |
1148 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1149 | write_unlock_bh(&xfrm_policy_lock); | |
1150 | xfrm_pol_put(newp); | |
1151 | } | |
1152 | return newp; | |
1153 | } | |
1154 | ||
1155 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1156 | { | |
1157 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1158 | *p1 = sk->sk_policy[1]; | |
1159 | ||
1160 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1161 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1162 | return -ENOMEM; | |
1163 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1164 | return -ENOMEM; | |
1165 | return 0; | |
1166 | } | |
1167 | ||
a1e59abf | 1168 | static int |
fbda33b2 | 1169 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1170 | unsigned short family) |
1171 | { | |
1172 | int err; | |
1173 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1174 | ||
1175 | if (unlikely(afinfo == NULL)) | |
1176 | return -EINVAL; | |
fbda33b2 | 1177 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1178 | xfrm_policy_put_afinfo(afinfo); |
1179 | return err; | |
1180 | } | |
1181 | ||
1da177e4 LT |
1182 | /* Resolve list of templates for the flow, given policy. */ |
1183 | ||
1184 | static int | |
4e81bb83 MN |
1185 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1186 | struct xfrm_state **xfrm, | |
1187 | unsigned short family) | |
1da177e4 | 1188 | { |
fbda33b2 | 1189 | struct net *net = xp_net(policy); |
1da177e4 LT |
1190 | int nx; |
1191 | int i, error; | |
1192 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1193 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1194 | xfrm_address_t tmp; |
1da177e4 LT |
1195 | |
1196 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1197 | struct xfrm_state *x; | |
1198 | xfrm_address_t *remote = daddr; | |
1199 | xfrm_address_t *local = saddr; | |
1200 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1201 | ||
48b8d783 JK |
1202 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1203 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1204 | remote = &tmpl->id.daddr; |
1205 | local = &tmpl->saddr; | |
76b3f055 | 1206 | family = tmpl->encap_family; |
a1e59abf | 1207 | if (xfrm_addr_any(local, family)) { |
fbda33b2 | 1208 | error = xfrm_get_saddr(net, &tmp, remote, family); |
a1e59abf PM |
1209 | if (error) |
1210 | goto fail; | |
1211 | local = &tmp; | |
1212 | } | |
1da177e4 LT |
1213 | } |
1214 | ||
1215 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1216 | ||
1217 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1218 | xfrm[nx++] = x; | |
1219 | daddr = remote; | |
1220 | saddr = local; | |
1221 | continue; | |
1222 | } | |
1223 | if (x) { | |
1224 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1225 | -EINVAL : -EAGAIN); | |
1226 | xfrm_state_put(x); | |
1227 | } | |
a4322266 | 1228 | else if (error == -ESRCH) |
1229 | error = -EAGAIN; | |
1da177e4 LT |
1230 | |
1231 | if (!tmpl->optional) | |
1232 | goto fail; | |
1233 | } | |
1234 | return nx; | |
1235 | ||
1236 | fail: | |
1237 | for (nx--; nx>=0; nx--) | |
1238 | xfrm_state_put(xfrm[nx]); | |
1239 | return error; | |
1240 | } | |
1241 | ||
4e81bb83 MN |
1242 | static int |
1243 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1244 | struct xfrm_state **xfrm, | |
1245 | unsigned short family) | |
1246 | { | |
41a49cc3 MN |
1247 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1248 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1249 | int cnx = 0; |
1250 | int error; | |
1251 | int ret; | |
1252 | int i; | |
1253 | ||
1254 | for (i = 0; i < npols; i++) { | |
1255 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1256 | error = -ENOBUFS; | |
1257 | goto fail; | |
1258 | } | |
41a49cc3 MN |
1259 | |
1260 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1261 | if (ret < 0) { |
1262 | error = ret; | |
1263 | goto fail; | |
1264 | } else | |
1265 | cnx += ret; | |
1266 | } | |
1267 | ||
41a49cc3 MN |
1268 | /* found states are sorted for outbound processing */ |
1269 | if (npols > 1) | |
1270 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1271 | ||
4e81bb83 MN |
1272 | return cnx; |
1273 | ||
1274 | fail: | |
1275 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1276 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1277 | return error; |
1278 | ||
1279 | } | |
1280 | ||
1da177e4 LT |
1281 | /* Check that the bundle accepts the flow and its components are |
1282 | * still valid. | |
1283 | */ | |
1284 | ||
1285 | static struct dst_entry * | |
1286 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1287 | { | |
1288 | struct dst_entry *x; | |
1289 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1290 | if (unlikely(afinfo == NULL)) | |
1291 | return ERR_PTR(-EINVAL); | |
1292 | x = afinfo->find_bundle(fl, policy); | |
1293 | xfrm_policy_put_afinfo(afinfo); | |
1294 | return x; | |
1295 | } | |
1296 | ||
25ee3286 HX |
1297 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1298 | { | |
1299 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1300 | int tos; | |
1da177e4 | 1301 | |
25ee3286 HX |
1302 | if (!afinfo) |
1303 | return -EINVAL; | |
1304 | ||
1305 | tos = afinfo->get_tos(fl); | |
1306 | ||
1307 | xfrm_policy_put_afinfo(afinfo); | |
1308 | ||
1309 | return tos; | |
1310 | } | |
1311 | ||
d7c7544c | 1312 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1313 | { |
1da177e4 | 1314 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1315 | struct dst_ops *dst_ops; |
25ee3286 HX |
1316 | struct xfrm_dst *xdst; |
1317 | ||
1318 | if (!afinfo) | |
1319 | return ERR_PTR(-EINVAL); | |
1320 | ||
d7c7544c AD |
1321 | switch (family) { |
1322 | case AF_INET: | |
1323 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1324 | break; | |
1325 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1326 | case AF_INET6: | |
1327 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1328 | break; | |
1329 | #endif | |
1330 | default: | |
1331 | BUG(); | |
1332 | } | |
1333 | xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS); | |
25ee3286 HX |
1334 | |
1335 | xfrm_policy_put_afinfo(afinfo); | |
1336 | ||
1337 | return xdst; | |
1338 | } | |
1339 | ||
a1b05140 MN |
1340 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1341 | int nfheader_len) | |
1342 | { | |
1343 | struct xfrm_policy_afinfo *afinfo = | |
1344 | xfrm_policy_get_afinfo(dst->ops->family); | |
1345 | int err; | |
1346 | ||
1347 | if (!afinfo) | |
1348 | return -EINVAL; | |
1349 | ||
1350 | err = afinfo->init_path(path, dst, nfheader_len); | |
1351 | ||
1352 | xfrm_policy_put_afinfo(afinfo); | |
1353 | ||
1354 | return err; | |
1355 | } | |
1356 | ||
25ee3286 HX |
1357 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev) |
1358 | { | |
1359 | struct xfrm_policy_afinfo *afinfo = | |
1360 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1361 | int err; | |
1362 | ||
1363 | if (!afinfo) | |
1da177e4 | 1364 | return -EINVAL; |
25ee3286 HX |
1365 | |
1366 | err = afinfo->fill_dst(xdst, dev); | |
1367 | ||
1da177e4 | 1368 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1369 | |
1da177e4 LT |
1370 | return err; |
1371 | } | |
1372 | ||
25ee3286 HX |
1373 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1374 | * all the metrics... Shortly, bundle a bundle. | |
1375 | */ | |
1376 | ||
1377 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1378 | struct xfrm_state **xfrm, int nx, | |
1379 | struct flowi *fl, | |
1380 | struct dst_entry *dst) | |
1381 | { | |
d7c7544c | 1382 | struct net *net = xp_net(policy); |
25ee3286 HX |
1383 | unsigned long now = jiffies; |
1384 | struct net_device *dev; | |
1385 | struct dst_entry *dst_prev = NULL; | |
1386 | struct dst_entry *dst0 = NULL; | |
1387 | int i = 0; | |
1388 | int err; | |
1389 | int header_len = 0; | |
a1b05140 | 1390 | int nfheader_len = 0; |
25ee3286 HX |
1391 | int trailer_len = 0; |
1392 | int tos; | |
1393 | int family = policy->selector.family; | |
9bb182a7 YH |
1394 | xfrm_address_t saddr, daddr; |
1395 | ||
1396 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1397 | |
1398 | tos = xfrm_get_tos(fl, family); | |
1399 | err = tos; | |
1400 | if (tos < 0) | |
1401 | goto put_states; | |
1402 | ||
1403 | dst_hold(dst); | |
1404 | ||
1405 | for (; i < nx; i++) { | |
d7c7544c | 1406 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1407 | struct dst_entry *dst1 = &xdst->u.dst; |
1408 | ||
1409 | err = PTR_ERR(xdst); | |
1410 | if (IS_ERR(xdst)) { | |
1411 | dst_release(dst); | |
1412 | goto put_states; | |
1413 | } | |
1414 | ||
1415 | if (!dst_prev) | |
1416 | dst0 = dst1; | |
1417 | else { | |
1418 | dst_prev->child = dst_clone(dst1); | |
1419 | dst1->flags |= DST_NOHASH; | |
1420 | } | |
1421 | ||
1422 | xdst->route = dst; | |
1423 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1424 | ||
1425 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1426 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1427 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1428 | family); | |
25ee3286 HX |
1429 | err = PTR_ERR(dst); |
1430 | if (IS_ERR(dst)) | |
1431 | goto put_states; | |
1432 | } else | |
1433 | dst_hold(dst); | |
1434 | ||
1435 | dst1->xfrm = xfrm[i]; | |
1436 | xdst->genid = xfrm[i]->genid; | |
1437 | ||
1438 | dst1->obsolete = -1; | |
1439 | dst1->flags |= DST_HOST; | |
1440 | dst1->lastuse = now; | |
1441 | ||
1442 | dst1->input = dst_discard; | |
1443 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1444 | ||
1445 | dst1->next = dst_prev; | |
1446 | dst_prev = dst1; | |
1447 | ||
1448 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1449 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1450 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1451 | trailer_len += xfrm[i]->props.trailer_len; |
1452 | } | |
1453 | ||
1454 | dst_prev->child = dst; | |
1455 | dst0->path = dst; | |
1456 | ||
1457 | err = -ENODEV; | |
1458 | dev = dst->dev; | |
1459 | if (!dev) | |
1460 | goto free_dst; | |
1461 | ||
96c53401 | 1462 | /* Copy neighbour for reachability confirmation */ |
25ee3286 HX |
1463 | dst0->neighbour = neigh_clone(dst->neighbour); |
1464 | ||
a1b05140 | 1465 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1466 | xfrm_init_pmtu(dst_prev); |
1467 | ||
1468 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1469 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1470 | ||
1471 | err = xfrm_fill_dst(xdst, dev); | |
1472 | if (err) | |
1473 | goto free_dst; | |
1474 | ||
1475 | dst_prev->header_len = header_len; | |
1476 | dst_prev->trailer_len = trailer_len; | |
1477 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1478 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1479 | } | |
1480 | ||
1481 | out: | |
1482 | return dst0; | |
1483 | ||
1484 | put_states: | |
1485 | for (; i < nx; i++) | |
1486 | xfrm_state_put(xfrm[i]); | |
1487 | free_dst: | |
1488 | if (dst0) | |
1489 | dst_free(dst0); | |
1490 | dst0 = ERR_PTR(err); | |
1491 | goto out; | |
1492 | } | |
1493 | ||
157bfc25 MN |
1494 | static int inline |
1495 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1496 | { | |
1497 | if (!*target) { | |
1498 | *target = kmalloc(size, GFP_ATOMIC); | |
1499 | if (!*target) | |
1500 | return -ENOMEM; | |
1501 | } | |
1502 | memcpy(*target, src, size); | |
1503 | return 0; | |
1504 | } | |
1505 | ||
1506 | static int inline | |
1507 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1508 | { | |
1509 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1510 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1511 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1512 | sel, sizeof(*sel)); | |
1513 | #else | |
1514 | return 0; | |
1515 | #endif | |
1516 | } | |
1517 | ||
1518 | static int inline | |
1519 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1520 | { | |
1521 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1522 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1523 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1524 | #else | |
1525 | return 0; | |
1526 | #endif | |
1527 | } | |
1da177e4 LT |
1528 | |
1529 | static int stale_bundle(struct dst_entry *dst); | |
1530 | ||
1531 | /* Main function: finds/creates a bundle for given flow. | |
1532 | * | |
1533 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1534 | * on interfaces with disabled IPsec. | |
1535 | */ | |
52479b62 | 1536 | int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 | 1537 | struct sock *sk, int flags) |
1da177e4 LT |
1538 | { |
1539 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1540 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1541 | int npols; | |
1542 | int pol_dead; | |
1543 | int xfrm_nr; | |
1544 | int pi; | |
1da177e4 LT |
1545 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1546 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1547 | int nx = 0; | |
1548 | int err; | |
1549 | u32 genid; | |
42cf93cd | 1550 | u16 family; |
df71837d | 1551 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1552 | |
1da177e4 LT |
1553 | restart: |
1554 | genid = atomic_read(&flow_cache_genid); | |
1555 | policy = NULL; | |
4e81bb83 MN |
1556 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1557 | pols[pi] = NULL; | |
1558 | npols = 0; | |
1559 | pol_dead = 0; | |
1560 | xfrm_nr = 0; | |
1561 | ||
f7944fb1 | 1562 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1563 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
75b8c133 | 1564 | err = PTR_ERR(policy); |
0aa64774 | 1565 | if (IS_ERR(policy)) { |
59c9940e | 1566 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
75b8c133 | 1567 | goto dropdst; |
0aa64774 | 1568 | } |
3bccfbc7 | 1569 | } |
1da177e4 LT |
1570 | |
1571 | if (!policy) { | |
1572 | /* To accelerate a bit... */ | |
2518c7c2 | 1573 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 1574 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 1575 | goto nopol; |
1da177e4 | 1576 | |
52479b62 | 1577 | policy = flow_cache_lookup(net, fl, dst_orig->ops->family, |
42cf93cd | 1578 | dir, xfrm_policy_lookup); |
75b8c133 | 1579 | err = PTR_ERR(policy); |
d66e37a9 | 1580 | if (IS_ERR(policy)) { |
59c9940e | 1581 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
75b8c133 | 1582 | goto dropdst; |
d66e37a9 | 1583 | } |
1da177e4 LT |
1584 | } |
1585 | ||
1586 | if (!policy) | |
8b7817f3 | 1587 | goto nopol; |
1da177e4 | 1588 | |
42cf93cd | 1589 | family = dst_orig->ops->family; |
4e81bb83 MN |
1590 | pols[0] = policy; |
1591 | npols ++; | |
1592 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 | 1593 | |
aef21785 | 1594 | err = -ENOENT; |
8b7817f3 HX |
1595 | if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) |
1596 | goto error; | |
1597 | ||
1598 | policy->curlft.use_time = get_seconds(); | |
1599 | ||
1da177e4 | 1600 | switch (policy->action) { |
5e5234ff | 1601 | default: |
1da177e4 LT |
1602 | case XFRM_POLICY_BLOCK: |
1603 | /* Prohibit the flow */ | |
59c9940e | 1604 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1605 | err = -EPERM; |
1606 | goto error; | |
1da177e4 LT |
1607 | |
1608 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1609 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1610 | if (policy->xfrm_nr == 0) { |
1611 | /* Flow passes not transformed. */ | |
1612 | xfrm_pol_put(policy); | |
1613 | return 0; | |
1614 | } | |
4e81bb83 | 1615 | #endif |
1da177e4 LT |
1616 | |
1617 | /* Try to find matching bundle. | |
1618 | * | |
1619 | * LATER: help from flow cache. It is optional, this | |
1620 | * is required only for output policy. | |
1621 | */ | |
1622 | dst = xfrm_find_bundle(fl, policy, family); | |
1623 | if (IS_ERR(dst)) { | |
59c9940e | 1624 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
e104411b PM |
1625 | err = PTR_ERR(dst); |
1626 | goto error; | |
1da177e4 LT |
1627 | } |
1628 | ||
1629 | if (dst) | |
1630 | break; | |
1631 | ||
4e81bb83 MN |
1632 | #ifdef CONFIG_XFRM_SUB_POLICY |
1633 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
52479b62 AD |
1634 | pols[1] = xfrm_policy_lookup_bytype(net, |
1635 | XFRM_POLICY_TYPE_MAIN, | |
4e81bb83 MN |
1636 | fl, family, |
1637 | XFRM_POLICY_OUT); | |
1638 | if (pols[1]) { | |
134b0fc5 | 1639 | if (IS_ERR(pols[1])) { |
59c9940e | 1640 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
134b0fc5 JM |
1641 | err = PTR_ERR(pols[1]); |
1642 | goto error; | |
1643 | } | |
4e81bb83 | 1644 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
59c9940e | 1645 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
4e81bb83 MN |
1646 | err = -EPERM; |
1647 | goto error; | |
1648 | } | |
1649 | npols ++; | |
1650 | xfrm_nr += pols[1]->xfrm_nr; | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | /* | |
1655 | * Because neither flowi nor bundle information knows about | |
1656 | * transformation template size. On more than one policy usage | |
1657 | * we can realize whether all of them is bypass or not after | |
1658 | * they are searched. See above not-transformed bypass | |
1659 | * is surrounded by non-sub policy configuration, too. | |
1660 | */ | |
1661 | if (xfrm_nr == 0) { | |
1662 | /* Flow passes not transformed. */ | |
1663 | xfrm_pols_put(pols, npols); | |
1664 | return 0; | |
1665 | } | |
1666 | ||
1667 | #endif | |
1668 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1669 | |
1670 | if (unlikely(nx<0)) { | |
1671 | err = nx; | |
b27aeadb | 1672 | if (err == -EAGAIN && net->xfrm.sysctl_larval_drop) { |
14e50e57 DM |
1673 | /* EREMOTE tells the caller to generate |
1674 | * a one-shot blackhole route. | |
1675 | */ | |
59c9940e | 1676 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
14e50e57 DM |
1677 | xfrm_pol_put(policy); |
1678 | return -EREMOTE; | |
1679 | } | |
815f4e57 | 1680 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
1da177e4 LT |
1681 | DECLARE_WAITQUEUE(wait, current); |
1682 | ||
52479b62 | 1683 | add_wait_queue(&net->xfrm.km_waitq, &wait); |
1da177e4 LT |
1684 | set_current_state(TASK_INTERRUPTIBLE); |
1685 | schedule(); | |
1686 | set_current_state(TASK_RUNNING); | |
52479b62 | 1687 | remove_wait_queue(&net->xfrm.km_waitq, &wait); |
1da177e4 | 1688 | |
4e81bb83 | 1689 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1690 | |
1691 | if (nx == -EAGAIN && signal_pending(current)) { | |
59c9940e | 1692 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 LT |
1693 | err = -ERESTART; |
1694 | goto error; | |
1695 | } | |
1696 | if (nx == -EAGAIN || | |
1697 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1698 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1699 | goto restart; |
1700 | } | |
1701 | err = nx; | |
1702 | } | |
0aa64774 | 1703 | if (err < 0) { |
59c9940e | 1704 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 | 1705 | goto error; |
0aa64774 | 1706 | } |
1da177e4 LT |
1707 | } |
1708 | if (nx == 0) { | |
1709 | /* Flow passes not transformed. */ | |
4e81bb83 | 1710 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1711 | return 0; |
1712 | } | |
1713 | ||
25ee3286 HX |
1714 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1715 | err = PTR_ERR(dst); | |
0aa64774 | 1716 | if (IS_ERR(dst)) { |
59c9940e | 1717 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); |
1da177e4 | 1718 | goto error; |
0aa64774 | 1719 | } |
1da177e4 | 1720 | |
4e81bb83 MN |
1721 | for (pi = 0; pi < npols; pi++) { |
1722 | read_lock_bh(&pols[pi]->lock); | |
12a169e7 | 1723 | pol_dead |= pols[pi]->walk.dead; |
4e81bb83 MN |
1724 | read_unlock_bh(&pols[pi]->lock); |
1725 | } | |
1726 | ||
1da177e4 | 1727 | write_lock_bh(&policy->lock); |
4e81bb83 | 1728 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1729 | /* Wow! While we worked on resolving, this |
1730 | * policy has gone. Retry. It is not paranoia, | |
1731 | * we just cannot enlist new bundle to dead object. | |
1732 | * We can't enlist stable bundles either. | |
1733 | */ | |
1734 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1735 | dst_free(dst); |
00de651d | 1736 | |
0aa64774 | 1737 | if (pol_dead) |
59c9940e | 1738 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLDEAD); |
0aa64774 | 1739 | else |
59c9940e | 1740 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
00de651d HX |
1741 | err = -EHOSTUNREACH; |
1742 | goto error; | |
1da177e4 | 1743 | } |
157bfc25 MN |
1744 | |
1745 | if (npols > 1) | |
1746 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1747 | else | |
1748 | err = xfrm_dst_update_origin(dst, fl); | |
1749 | if (unlikely(err)) { | |
1750 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1751 | dst_free(dst); |
59c9940e | 1752 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
157bfc25 MN |
1753 | goto error; |
1754 | } | |
1755 | ||
1da177e4 LT |
1756 | dst->next = policy->bundles; |
1757 | policy->bundles = dst; | |
1758 | dst_hold(dst); | |
1759 | write_unlock_bh(&policy->lock); | |
1760 | } | |
1761 | *dst_p = dst; | |
1762 | dst_release(dst_orig); | |
a716c119 | 1763 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1764 | return 0; |
1765 | ||
1766 | error: | |
4e81bb83 | 1767 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1768 | dropdst: |
1769 | dst_release(dst_orig); | |
1da177e4 LT |
1770 | *dst_p = NULL; |
1771 | return err; | |
8b7817f3 HX |
1772 | |
1773 | nopol: | |
aef21785 | 1774 | err = -ENOENT; |
8b7817f3 HX |
1775 | if (flags & XFRM_LOOKUP_ICMP) |
1776 | goto dropdst; | |
1777 | return 0; | |
1da177e4 | 1778 | } |
14e50e57 DM |
1779 | EXPORT_SYMBOL(__xfrm_lookup); |
1780 | ||
52479b62 | 1781 | int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 DM |
1782 | struct sock *sk, int flags) |
1783 | { | |
52479b62 | 1784 | int err = __xfrm_lookup(net, dst_p, fl, sk, flags); |
14e50e57 DM |
1785 | |
1786 | if (err == -EREMOTE) { | |
1787 | dst_release(*dst_p); | |
1788 | *dst_p = NULL; | |
1789 | err = -EAGAIN; | |
1790 | } | |
1791 | ||
1792 | return err; | |
1793 | } | |
1da177e4 LT |
1794 | EXPORT_SYMBOL(xfrm_lookup); |
1795 | ||
df0ba92a MN |
1796 | static inline int |
1797 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1798 | { | |
1799 | struct xfrm_state *x; | |
df0ba92a MN |
1800 | |
1801 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1802 | return 0; | |
1803 | x = skb->sp->xvec[idx]; | |
1804 | if (!x->type->reject) | |
1805 | return 0; | |
1ecafede | 1806 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1807 | } |
1808 | ||
1da177e4 LT |
1809 | /* When skb is transformed back to its "native" form, we have to |
1810 | * check policy restrictions. At the moment we make this in maximally | |
1811 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1812 | * have policy cached at them. | |
1813 | */ | |
1814 | ||
1815 | static inline int | |
a716c119 | 1816 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1817 | unsigned short family) |
1818 | { | |
1819 | if (xfrm_state_kern(x)) | |
928ba416 | 1820 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1821 | return x->id.proto == tmpl->id.proto && |
1822 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1823 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1824 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1825 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1826 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1827 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1828 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1829 | } |
1830 | ||
df0ba92a MN |
1831 | /* |
1832 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1833 | * because of optional transport mode, or next index of the mathced secpath | |
1834 | * state with the template. | |
1835 | * -1 is returned when no matching template is found. | |
1836 | * Otherwise "-2 - errored_index" is returned. | |
1837 | */ | |
1da177e4 LT |
1838 | static inline int |
1839 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1840 | unsigned short family) | |
1841 | { | |
1842 | int idx = start; | |
1843 | ||
1844 | if (tmpl->optional) { | |
7e49e6de | 1845 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1846 | return start; |
1847 | } else | |
1848 | start = -1; | |
1849 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1850 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1851 | return ++idx; |
df0ba92a MN |
1852 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1853 | if (start == -1) | |
1854 | start = -2-idx; | |
1da177e4 | 1855 | break; |
df0ba92a | 1856 | } |
1da177e4 LT |
1857 | } |
1858 | return start; | |
1859 | } | |
1860 | ||
d5422efe HX |
1861 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1862 | unsigned int family, int reverse) | |
1da177e4 LT |
1863 | { |
1864 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1865 | int err; |
1da177e4 LT |
1866 | |
1867 | if (unlikely(afinfo == NULL)) | |
1868 | return -EAFNOSUPPORT; | |
1869 | ||
d5422efe | 1870 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1871 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1872 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1873 | return err; |
1da177e4 | 1874 | } |
d5422efe | 1875 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1876 | |
df0ba92a | 1877 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1878 | { |
1879 | for (; k < sp->len; k++) { | |
df0ba92a | 1880 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1881 | *idxp = k; |
1da177e4 | 1882 | return 1; |
df0ba92a | 1883 | } |
1da177e4 LT |
1884 | } |
1885 | ||
1886 | return 0; | |
1887 | } | |
1888 | ||
a716c119 | 1889 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1890 | unsigned short family) |
1891 | { | |
f6e1e25d | 1892 | struct net *net = dev_net(skb->dev); |
1da177e4 | 1893 | struct xfrm_policy *pol; |
4e81bb83 MN |
1894 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1895 | int npols = 0; | |
1896 | int xfrm_nr; | |
1897 | int pi; | |
d5422efe | 1898 | int reverse; |
1da177e4 | 1899 | struct flowi fl; |
d5422efe | 1900 | u8 fl_dir; |
df0ba92a | 1901 | int xerr_idx = -1; |
1da177e4 | 1902 | |
d5422efe HX |
1903 | reverse = dir & ~XFRM_POLICY_MASK; |
1904 | dir &= XFRM_POLICY_MASK; | |
1905 | fl_dir = policy_to_flow_dir(dir); | |
1906 | ||
0aa64774 | 1907 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 1908 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 1909 | return 0; |
0aa64774 MN |
1910 | } |
1911 | ||
eb9c7ebe | 1912 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1913 | |
1914 | /* First, check used SA against their selectors. */ | |
1915 | if (skb->sp) { | |
1916 | int i; | |
1917 | ||
1918 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 1919 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 1920 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 1921 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 1922 | return 0; |
0aa64774 | 1923 | } |
1da177e4 LT |
1924 | } |
1925 | } | |
1926 | ||
1927 | pol = NULL; | |
3bccfbc7 | 1928 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1929 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 1930 | if (IS_ERR(pol)) { |
59c9940e | 1931 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 1932 | return 0; |
0aa64774 | 1933 | } |
3bccfbc7 | 1934 | } |
1da177e4 LT |
1935 | |
1936 | if (!pol) | |
f6e1e25d | 1937 | pol = flow_cache_lookup(net, &fl, family, fl_dir, |
1da177e4 LT |
1938 | xfrm_policy_lookup); |
1939 | ||
0aa64774 | 1940 | if (IS_ERR(pol)) { |
59c9940e | 1941 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 1942 | return 0; |
0aa64774 | 1943 | } |
134b0fc5 | 1944 | |
df0ba92a | 1945 | if (!pol) { |
d1d9facf | 1946 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 1947 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 1948 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
1949 | return 0; |
1950 | } | |
1951 | return 1; | |
1952 | } | |
1da177e4 | 1953 | |
9d729f72 | 1954 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1955 | |
4e81bb83 MN |
1956 | pols[0] = pol; |
1957 | npols ++; | |
1958 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1959 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 1960 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
1961 | &fl, family, |
1962 | XFRM_POLICY_IN); | |
1963 | if (pols[1]) { | |
0aa64774 | 1964 | if (IS_ERR(pols[1])) { |
59c9940e | 1965 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 1966 | return 0; |
0aa64774 | 1967 | } |
9d729f72 | 1968 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1969 | npols ++; |
1970 | } | |
1971 | } | |
1972 | #endif | |
1973 | ||
1da177e4 LT |
1974 | if (pol->action == XFRM_POLICY_ALLOW) { |
1975 | struct sec_path *sp; | |
1976 | static struct sec_path dummy; | |
4e81bb83 | 1977 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1978 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1979 | struct xfrm_tmpl **tpp = tp; |
1980 | int ti = 0; | |
1da177e4 LT |
1981 | int i, k; |
1982 | ||
1983 | if ((sp = skb->sp) == NULL) | |
1984 | sp = &dummy; | |
1985 | ||
4e81bb83 MN |
1986 | for (pi = 0; pi < npols; pi++) { |
1987 | if (pols[pi] != pol && | |
0aa64774 | 1988 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 1989 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 1990 | goto reject; |
0aa64774 MN |
1991 | } |
1992 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 1993 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 1994 | goto reject_error; |
0aa64774 | 1995 | } |
4e81bb83 MN |
1996 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
1997 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
1998 | } | |
1999 | xfrm_nr = ti; | |
41a49cc3 MN |
2000 | if (npols > 1) { |
2001 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2002 | tpp = stp; | |
2003 | } | |
4e81bb83 | 2004 | |
1da177e4 LT |
2005 | /* For each tunnel xfrm, find the first matching tmpl. |
2006 | * For each tmpl before that, find corresponding xfrm. | |
2007 | * Order is _important_. Later we will implement | |
2008 | * some barriers, but at the moment barriers | |
2009 | * are implied between each two transformations. | |
2010 | */ | |
4e81bb83 MN |
2011 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2012 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2013 | if (k < 0) { |
d1d9facf JM |
2014 | if (k < -1) |
2015 | /* "-2 - errored_index" returned */ | |
2016 | xerr_idx = -(2+k); | |
59c9940e | 2017 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2018 | goto reject; |
df0ba92a | 2019 | } |
1da177e4 LT |
2020 | } |
2021 | ||
0aa64774 | 2022 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2023 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2024 | goto reject; |
0aa64774 | 2025 | } |
1da177e4 | 2026 | |
4e81bb83 | 2027 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2028 | return 1; |
2029 | } | |
59c9940e | 2030 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2031 | |
2032 | reject: | |
df0ba92a | 2033 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2034 | reject_error: |
2035 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2036 | return 0; |
2037 | } | |
2038 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2039 | ||
2040 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2041 | { | |
99a66657 | 2042 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2043 | struct flowi fl; |
adf30907 ED |
2044 | struct dst_entry *dst; |
2045 | int res; | |
1da177e4 | 2046 | |
0aa64774 MN |
2047 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
2048 | /* XXX: we should have something like FWDHDRERROR here. */ | |
59c9940e | 2049 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2050 | return 0; |
0aa64774 | 2051 | } |
1da177e4 | 2052 | |
adf30907 ED |
2053 | dst = skb_dst(skb); |
2054 | ||
2055 | res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0; | |
2056 | skb_dst_set(skb, dst); | |
2057 | return res; | |
1da177e4 LT |
2058 | } |
2059 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2060 | ||
d49c73c7 DM |
2061 | /* Optimize later using cookies and generation ids. */ |
2062 | ||
1da177e4 LT |
2063 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2064 | { | |
d49c73c7 DM |
2065 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2066 | * to "-1" to force all XFRM destinations to get validated by | |
2067 | * dst_ops->check on every use. We do this because when a | |
2068 | * normal route referenced by an XFRM dst is obsoleted we do | |
2069 | * not go looking around for all parent referencing XFRM dsts | |
2070 | * so that we can invalidate them. It is just too much work. | |
2071 | * Instead we make the checks here on every use. For example: | |
2072 | * | |
2073 | * XFRM dst A --> IPv4 dst X | |
2074 | * | |
2075 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2076 | * in this example). If X is marked obsolete, "A" will not | |
2077 | * notice. That's what we are validating here via the | |
2078 | * stale_bundle() check. | |
2079 | * | |
2080 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2081 | * dst which causes it's ->obsolete field to be set to a | |
2082 | * positive non-zero integer. If an XFRM dst has been pruned | |
2083 | * like this, we want to force a new route lookup. | |
399c180a | 2084 | */ |
d49c73c7 DM |
2085 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2086 | return dst; | |
2087 | ||
1da177e4 LT |
2088 | return NULL; |
2089 | } | |
2090 | ||
2091 | static int stale_bundle(struct dst_entry *dst) | |
2092 | { | |
5b368e61 | 2093 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2094 | } |
2095 | ||
aabc9761 | 2096 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2097 | { |
1da177e4 | 2098 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2099 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2100 | dev_hold(dst->dev); |
1da177e4 LT |
2101 | dev_put(dev); |
2102 | } | |
2103 | } | |
aabc9761 | 2104 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2105 | |
2106 | static void xfrm_link_failure(struct sk_buff *skb) | |
2107 | { | |
2108 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2109 | return; | |
2110 | } | |
2111 | ||
2112 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2113 | { | |
2114 | if (dst) { | |
2115 | if (dst->obsolete) { | |
2116 | dst_release(dst); | |
2117 | dst = NULL; | |
2118 | } | |
2119 | } | |
2120 | return dst; | |
2121 | } | |
2122 | ||
2518c7c2 DM |
2123 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
2124 | { | |
2125 | struct dst_entry *dst, **dstp; | |
2126 | ||
2127 | write_lock(&pol->lock); | |
2128 | dstp = &pol->bundles; | |
2129 | while ((dst=*dstp) != NULL) { | |
2130 | if (func(dst)) { | |
2131 | *dstp = dst->next; | |
2132 | dst->next = *gc_list_p; | |
2133 | *gc_list_p = dst; | |
2134 | } else { | |
2135 | dstp = &dst->next; | |
2136 | } | |
2137 | } | |
2138 | write_unlock(&pol->lock); | |
2139 | } | |
2140 | ||
3dd0b499 | 2141 | static void xfrm_prune_bundles(struct net *net, int (*func)(struct dst_entry *)) |
1da177e4 | 2142 | { |
2518c7c2 DM |
2143 | struct dst_entry *gc_list = NULL; |
2144 | int dir; | |
1da177e4 LT |
2145 | |
2146 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2147 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2148 | struct xfrm_policy *pol; | |
2149 | struct hlist_node *entry; | |
2150 | struct hlist_head *table; | |
2151 | int i; | |
4e81bb83 | 2152 | |
2518c7c2 | 2153 | hlist_for_each_entry(pol, entry, |
3dd0b499 | 2154 | &net->xfrm.policy_inexact[dir], bydst) |
2518c7c2 DM |
2155 | prune_one_bundle(pol, func, &gc_list); |
2156 | ||
3dd0b499 AD |
2157 | table = net->xfrm.policy_bydst[dir].table; |
2158 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { | |
2518c7c2 DM |
2159 | hlist_for_each_entry(pol, entry, table + i, bydst) |
2160 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2161 | } |
2162 | } | |
2163 | read_unlock_bh(&xfrm_policy_lock); | |
2164 | ||
2165 | while (gc_list) { | |
2518c7c2 | 2166 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2167 | gc_list = dst->next; |
2168 | dst_free(dst); | |
2169 | } | |
2170 | } | |
2171 | ||
2172 | static int unused_bundle(struct dst_entry *dst) | |
2173 | { | |
2174 | return !atomic_read(&dst->__refcnt); | |
2175 | } | |
2176 | ||
ddcfd796 | 2177 | static void __xfrm_garbage_collect(struct net *net) |
1da177e4 | 2178 | { |
ddcfd796 | 2179 | xfrm_prune_bundles(net, unused_bundle); |
1da177e4 LT |
2180 | } |
2181 | ||
3dd0b499 | 2182 | static int xfrm_flush_bundles(struct net *net) |
1da177e4 | 2183 | { |
3dd0b499 | 2184 | xfrm_prune_bundles(net, stale_bundle); |
1da177e4 LT |
2185 | return 0; |
2186 | } | |
2187 | ||
25ee3286 | 2188 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2189 | { |
2190 | do { | |
2191 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2192 | u32 pmtu, route_mtu_cached; | |
2193 | ||
2194 | pmtu = dst_mtu(dst->child); | |
2195 | xdst->child_mtu_cached = pmtu; | |
2196 | ||
2197 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2198 | ||
2199 | route_mtu_cached = dst_mtu(xdst->route); | |
2200 | xdst->route_mtu_cached = route_mtu_cached; | |
2201 | ||
2202 | if (pmtu > route_mtu_cached) | |
2203 | pmtu = route_mtu_cached; | |
2204 | ||
2205 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2206 | } while ((dst = dst->next)); | |
2207 | } | |
2208 | ||
1da177e4 LT |
2209 | /* Check that the bundle accepts the flow and its components are |
2210 | * still valid. | |
2211 | */ | |
2212 | ||
5b368e61 VY |
2213 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2214 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2215 | { |
2216 | struct dst_entry *dst = &first->u.dst; | |
2217 | struct xfrm_dst *last; | |
2218 | u32 mtu; | |
2219 | ||
92d63dec | 2220 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2221 | (dst->dev && !netif_running(dst->dev))) |
2222 | return 0; | |
157bfc25 MN |
2223 | #ifdef CONFIG_XFRM_SUB_POLICY |
2224 | if (fl) { | |
2225 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2226 | return 0; | |
2227 | if (first->partner && | |
2228 | !xfrm_selector_match(first->partner, fl, family)) | |
2229 | return 0; | |
2230 | } | |
2231 | #endif | |
1da177e4 LT |
2232 | |
2233 | last = NULL; | |
2234 | ||
2235 | do { | |
2236 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2237 | ||
2238 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2239 | return 0; | |
67f83cbf VY |
2240 | if (fl && pol && |
2241 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2242 | return 0; |
1da177e4 LT |
2243 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2244 | return 0; | |
9d4a706d DM |
2245 | if (xdst->genid != dst->xfrm->genid) |
2246 | return 0; | |
e53820de | 2247 | |
1bfcb10f | 2248 | if (strict && fl && |
13996378 | 2249 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2250 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2251 | return 0; | |
1da177e4 LT |
2252 | |
2253 | mtu = dst_mtu(dst->child); | |
2254 | if (xdst->child_mtu_cached != mtu) { | |
2255 | last = xdst; | |
2256 | xdst->child_mtu_cached = mtu; | |
2257 | } | |
2258 | ||
92d63dec | 2259 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2260 | return 0; |
2261 | mtu = dst_mtu(xdst->route); | |
2262 | if (xdst->route_mtu_cached != mtu) { | |
2263 | last = xdst; | |
2264 | xdst->route_mtu_cached = mtu; | |
2265 | } | |
2266 | ||
2267 | dst = dst->child; | |
2268 | } while (dst->xfrm); | |
2269 | ||
2270 | if (likely(!last)) | |
2271 | return 1; | |
2272 | ||
2273 | mtu = last->child_mtu_cached; | |
2274 | for (;;) { | |
2275 | dst = &last->u.dst; | |
2276 | ||
2277 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2278 | if (mtu > last->route_mtu_cached) | |
2279 | mtu = last->route_mtu_cached; | |
2280 | dst->metrics[RTAX_MTU-1] = mtu; | |
2281 | ||
2282 | if (last == first) | |
2283 | break; | |
2284 | ||
bd0bf076 | 2285 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2286 | last->child_mtu_cached = mtu; |
2287 | } | |
2288 | ||
2289 | return 1; | |
2290 | } | |
2291 | ||
2292 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2293 | ||
1da177e4 LT |
2294 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2295 | { | |
d7c7544c | 2296 | struct net *net; |
1da177e4 LT |
2297 | int err = 0; |
2298 | if (unlikely(afinfo == NULL)) | |
2299 | return -EINVAL; | |
2300 | if (unlikely(afinfo->family >= NPROTO)) | |
2301 | return -EAFNOSUPPORT; | |
e959d812 | 2302 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2303 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2304 | err = -ENOBUFS; | |
2305 | else { | |
2306 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2307 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2308 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2309 | if (likely(dst_ops->check == NULL)) | |
2310 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2311 | if (likely(dst_ops->negative_advice == NULL)) |
2312 | dst_ops->negative_advice = xfrm_negative_advice; | |
2313 | if (likely(dst_ops->link_failure == NULL)) | |
2314 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2315 | if (likely(afinfo->garbage_collect == NULL)) |
2316 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2317 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2318 | } | |
e959d812 | 2319 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2320 | |
2321 | rtnl_lock(); | |
2322 | for_each_net(net) { | |
2323 | struct dst_ops *xfrm_dst_ops; | |
2324 | ||
2325 | switch (afinfo->family) { | |
2326 | case AF_INET: | |
2327 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2328 | break; | |
2329 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2330 | case AF_INET6: | |
2331 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2332 | break; | |
2333 | #endif | |
2334 | default: | |
2335 | BUG(); | |
2336 | } | |
2337 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2338 | } | |
2339 | rtnl_unlock(); | |
2340 | ||
1da177e4 LT |
2341 | return err; |
2342 | } | |
2343 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2344 | ||
2345 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2346 | { | |
2347 | int err = 0; | |
2348 | if (unlikely(afinfo == NULL)) | |
2349 | return -EINVAL; | |
2350 | if (unlikely(afinfo->family >= NPROTO)) | |
2351 | return -EAFNOSUPPORT; | |
e959d812 | 2352 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2353 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2354 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2355 | err = -EINVAL; | |
2356 | else { | |
2357 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2358 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2359 | dst_ops->kmem_cachep = NULL; | |
2360 | dst_ops->check = NULL; | |
1da177e4 LT |
2361 | dst_ops->negative_advice = NULL; |
2362 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2363 | afinfo->garbage_collect = NULL; |
2364 | } | |
2365 | } | |
e959d812 | 2366 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2367 | return err; |
2368 | } | |
2369 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2370 | ||
d7c7544c AD |
2371 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2372 | { | |
2373 | struct xfrm_policy_afinfo *afinfo; | |
2374 | ||
2375 | read_lock_bh(&xfrm_policy_afinfo_lock); | |
2376 | afinfo = xfrm_policy_afinfo[AF_INET]; | |
2377 | if (afinfo) | |
2378 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
2379 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2380 | afinfo = xfrm_policy_afinfo[AF_INET6]; | |
2381 | if (afinfo) | |
2382 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2383 | #endif | |
2384 | read_unlock_bh(&xfrm_policy_afinfo_lock); | |
2385 | } | |
2386 | ||
1da177e4 LT |
2387 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
2388 | { | |
2389 | struct xfrm_policy_afinfo *afinfo; | |
2390 | if (unlikely(family >= NPROTO)) | |
2391 | return NULL; | |
2392 | read_lock(&xfrm_policy_afinfo_lock); | |
2393 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2394 | if (unlikely(!afinfo)) |
2395 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2396 | return afinfo; |
2397 | } | |
2398 | ||
2399 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2400 | { | |
546be240 HX |
2401 | read_unlock(&xfrm_policy_afinfo_lock); |
2402 | } | |
2403 | ||
1da177e4 LT |
2404 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2405 | { | |
e9dc8653 EB |
2406 | struct net_device *dev = ptr; |
2407 | ||
1da177e4 LT |
2408 | switch (event) { |
2409 | case NETDEV_DOWN: | |
3dd0b499 | 2410 | xfrm_flush_bundles(dev_net(dev)); |
1da177e4 LT |
2411 | } |
2412 | return NOTIFY_DONE; | |
2413 | } | |
2414 | ||
2415 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2416 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2417 | }; |
2418 | ||
558f82ef | 2419 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2420 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2421 | { |
c68cd1a0 AD |
2422 | int rv; |
2423 | ||
7d720c3e | 2424 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
558f82ef MN |
2425 | sizeof(struct linux_xfrm_mib)) < 0) |
2426 | return -ENOMEM; | |
c68cd1a0 AD |
2427 | rv = xfrm_proc_init(net); |
2428 | if (rv < 0) | |
7d720c3e | 2429 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
c68cd1a0 | 2430 | return rv; |
558f82ef | 2431 | } |
59c9940e AD |
2432 | |
2433 | static void xfrm_statistics_fini(struct net *net) | |
2434 | { | |
c68cd1a0 | 2435 | xfrm_proc_fini(net); |
7d720c3e | 2436 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
59c9940e AD |
2437 | } |
2438 | #else | |
2439 | static int __net_init xfrm_statistics_init(struct net *net) | |
2440 | { | |
2441 | return 0; | |
2442 | } | |
2443 | ||
2444 | static void xfrm_statistics_fini(struct net *net) | |
2445 | { | |
2446 | } | |
558f82ef MN |
2447 | #endif |
2448 | ||
d62ddc21 | 2449 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2450 | { |
2518c7c2 DM |
2451 | unsigned int hmask, sz; |
2452 | int dir; | |
2453 | ||
d62ddc21 AD |
2454 | if (net_eq(net, &init_net)) |
2455 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2456 | sizeof(struct xfrm_dst), |
e5d679f3 | 2457 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2458 | NULL); |
1da177e4 | 2459 | |
2518c7c2 DM |
2460 | hmask = 8 - 1; |
2461 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2462 | ||
93b851c1 AD |
2463 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2464 | if (!net->xfrm.policy_byidx) | |
2465 | goto out_byidx; | |
8100bea7 | 2466 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2467 | |
2468 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2469 | struct xfrm_policy_hash *htab; | |
2470 | ||
dc2caba7 | 2471 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2472 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2473 | |
a35f6c5d | 2474 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2475 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2476 | if (!htab->table) |
a35f6c5d AD |
2477 | goto out_bydst; |
2478 | htab->hmask = hmask; | |
2518c7c2 DM |
2479 | } |
2480 | ||
adfcf0b2 | 2481 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2482 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2483 | if (net_eq(net, &init_net)) |
2484 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2485 | return 0; | |
93b851c1 | 2486 | |
a35f6c5d AD |
2487 | out_bydst: |
2488 | for (dir--; dir >= 0; dir--) { | |
2489 | struct xfrm_policy_hash *htab; | |
2490 | ||
2491 | htab = &net->xfrm.policy_bydst[dir]; | |
2492 | xfrm_hash_free(htab->table, sz); | |
2493 | } | |
2494 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2495 | out_byidx: |
2496 | return -ENOMEM; | |
d62ddc21 AD |
2497 | } |
2498 | ||
2499 | static void xfrm_policy_fini(struct net *net) | |
2500 | { | |
7c2776ee | 2501 | struct xfrm_audit audit_info; |
93b851c1 | 2502 | unsigned int sz; |
8b18f8ea | 2503 | int dir; |
93b851c1 | 2504 | |
7c2776ee AD |
2505 | flush_work(&net->xfrm.policy_hash_work); |
2506 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2507 | audit_info.loginuid = -1; | |
2508 | audit_info.sessionid = -1; | |
2509 | audit_info.secid = 0; | |
2510 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2511 | #endif | |
2512 | audit_info.loginuid = -1; | |
2513 | audit_info.sessionid = -1; | |
2514 | audit_info.secid = 0; | |
2515 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
2516 | flush_work(&xfrm_policy_gc_work); | |
2517 | ||
adfcf0b2 | 2518 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2519 | |
8b18f8ea | 2520 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2521 | struct xfrm_policy_hash *htab; |
2522 | ||
8b18f8ea | 2523 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2524 | |
2525 | htab = &net->xfrm.policy_bydst[dir]; | |
2526 | sz = (htab->hmask + 1); | |
2527 | WARN_ON(!hlist_empty(htab->table)); | |
2528 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2529 | } |
2530 | ||
8100bea7 | 2531 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2532 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2533 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2534 | } |
2535 | ||
d62ddc21 AD |
2536 | static int __net_init xfrm_net_init(struct net *net) |
2537 | { | |
2538 | int rv; | |
2539 | ||
59c9940e AD |
2540 | rv = xfrm_statistics_init(net); |
2541 | if (rv < 0) | |
2542 | goto out_statistics; | |
d62ddc21 AD |
2543 | rv = xfrm_state_init(net); |
2544 | if (rv < 0) | |
2545 | goto out_state; | |
2546 | rv = xfrm_policy_init(net); | |
2547 | if (rv < 0) | |
2548 | goto out_policy; | |
d7c7544c | 2549 | xfrm_dst_ops_init(net); |
b27aeadb AD |
2550 | rv = xfrm_sysctl_init(net); |
2551 | if (rv < 0) | |
2552 | goto out_sysctl; | |
d62ddc21 AD |
2553 | return 0; |
2554 | ||
b27aeadb AD |
2555 | out_sysctl: |
2556 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2557 | out_policy: |
2558 | xfrm_state_fini(net); | |
2559 | out_state: | |
59c9940e AD |
2560 | xfrm_statistics_fini(net); |
2561 | out_statistics: | |
d62ddc21 AD |
2562 | return rv; |
2563 | } | |
2564 | ||
2565 | static void __net_exit xfrm_net_exit(struct net *net) | |
2566 | { | |
b27aeadb | 2567 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2568 | xfrm_policy_fini(net); |
2569 | xfrm_state_fini(net); | |
59c9940e | 2570 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2571 | } |
2572 | ||
2573 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2574 | .init = xfrm_net_init, | |
2575 | .exit = xfrm_net_exit, | |
2576 | }; | |
2577 | ||
1da177e4 LT |
2578 | void __init xfrm_init(void) |
2579 | { | |
d62ddc21 | 2580 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
2581 | xfrm_input_init(); |
2582 | } | |
2583 | ||
ab5f5e8b | 2584 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2585 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2586 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2587 | { |
875179fa PM |
2588 | struct xfrm_sec_ctx *ctx = xp->security; |
2589 | struct xfrm_selector *sel = &xp->selector; | |
2590 | ||
2591 | if (ctx) | |
ab5f5e8b | 2592 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2593 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2594 | |
875179fa | 2595 | switch(sel->family) { |
ab5f5e8b | 2596 | case AF_INET: |
21454aaa | 2597 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2598 | if (sel->prefixlen_s != 32) |
2599 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2600 | sel->prefixlen_s); | |
21454aaa | 2601 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2602 | if (sel->prefixlen_d != 32) |
2603 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2604 | sel->prefixlen_d); | |
ab5f5e8b JL |
2605 | break; |
2606 | case AF_INET6: | |
5b095d98 | 2607 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2608 | if (sel->prefixlen_s != 128) |
2609 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2610 | sel->prefixlen_s); | |
5b095d98 | 2611 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2612 | if (sel->prefixlen_d != 128) |
2613 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2614 | sel->prefixlen_d); | |
ab5f5e8b JL |
2615 | break; |
2616 | } | |
2617 | } | |
2618 | ||
68277acc | 2619 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2620 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2621 | { |
2622 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2623 | |
afeb14b4 | 2624 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2625 | if (audit_buf == NULL) |
2626 | return; | |
2532386f | 2627 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2628 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2629 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2630 | audit_log_end(audit_buf); | |
2631 | } | |
2632 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2633 | ||
68277acc | 2634 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2635 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2636 | { |
2637 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2638 | |
afeb14b4 | 2639 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2640 | if (audit_buf == NULL) |
2641 | return; | |
2532386f | 2642 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2643 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2644 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2645 | audit_log_end(audit_buf); | |
2646 | } | |
2647 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2648 | #endif | |
2649 | ||
80c9abaa SS |
2650 | #ifdef CONFIG_XFRM_MIGRATE |
2651 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2652 | struct xfrm_selector *sel_tgt) | |
2653 | { | |
2654 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2655 | if (sel_tgt->family == sel_cmp->family && | |
2656 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2657 | sel_cmp->family) == 0 && |
80c9abaa SS |
2658 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2659 | sel_cmp->family) == 0 && | |
2660 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2661 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2662 | return 1; | |
2663 | } | |
2664 | } else { | |
2665 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2666 | return 1; | |
2667 | } | |
2668 | } | |
2669 | return 0; | |
2670 | } | |
2671 | ||
2672 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2673 | u8 dir, u8 type) | |
2674 | { | |
2675 | struct xfrm_policy *pol, *ret = NULL; | |
2676 | struct hlist_node *entry; | |
2677 | struct hlist_head *chain; | |
2678 | u32 priority = ~0U; | |
2679 | ||
2680 | read_lock_bh(&xfrm_policy_lock); | |
1121994c | 2681 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
80c9abaa SS |
2682 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2683 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2684 | pol->type == type) { | |
2685 | ret = pol; | |
2686 | priority = ret->priority; | |
2687 | break; | |
2688 | } | |
2689 | } | |
8b18f8ea | 2690 | chain = &init_net.xfrm.policy_inexact[dir]; |
80c9abaa SS |
2691 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2692 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2693 | pol->type == type && | |
2694 | pol->priority < priority) { | |
2695 | ret = pol; | |
2696 | break; | |
2697 | } | |
2698 | } | |
2699 | ||
2700 | if (ret) | |
2701 | xfrm_pol_hold(ret); | |
2702 | ||
2703 | read_unlock_bh(&xfrm_policy_lock); | |
2704 | ||
2705 | return ret; | |
2706 | } | |
2707 | ||
2708 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2709 | { | |
2710 | int match = 0; | |
2711 | ||
2712 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2713 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2714 | switch (t->mode) { | |
2715 | case XFRM_MODE_TUNNEL: | |
2716 | case XFRM_MODE_BEET: | |
2717 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2718 | m->old_family) == 0 && | |
2719 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2720 | m->old_family) == 0) { | |
2721 | match = 1; | |
2722 | } | |
2723 | break; | |
2724 | case XFRM_MODE_TRANSPORT: | |
2725 | /* in case of transport mode, template does not store | |
2726 | any IP addresses, hence we just compare mode and | |
2727 | protocol */ | |
2728 | match = 1; | |
2729 | break; | |
2730 | default: | |
2731 | break; | |
2732 | } | |
2733 | } | |
2734 | return match; | |
2735 | } | |
2736 | ||
2737 | /* update endpoint address(es) of template(s) */ | |
2738 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2739 | struct xfrm_migrate *m, int num_migrate) | |
2740 | { | |
2741 | struct xfrm_migrate *mp; | |
2742 | struct dst_entry *dst; | |
2743 | int i, j, n = 0; | |
2744 | ||
2745 | write_lock_bh(&pol->lock); | |
12a169e7 | 2746 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2747 | /* target policy has been deleted */ |
2748 | write_unlock_bh(&pol->lock); | |
2749 | return -ENOENT; | |
2750 | } | |
2751 | ||
2752 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2753 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2754 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2755 | continue; | |
2756 | n++; | |
1bfcb10f HX |
2757 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2758 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2759 | continue; |
2760 | /* update endpoints */ | |
2761 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2762 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2763 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2764 | sizeof(pol->xfrm_vec[i].saddr)); | |
2765 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2766 | /* flush bundles */ | |
2767 | while ((dst = pol->bundles) != NULL) { | |
2768 | pol->bundles = dst->next; | |
2769 | dst_free(dst); | |
2770 | } | |
2771 | } | |
2772 | } | |
2773 | ||
2774 | write_unlock_bh(&pol->lock); | |
2775 | ||
2776 | if (!n) | |
2777 | return -ENODATA; | |
2778 | ||
2779 | return 0; | |
2780 | } | |
2781 | ||
2782 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2783 | { | |
2784 | int i, j; | |
2785 | ||
2786 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2787 | return -EINVAL; | |
2788 | ||
2789 | for (i = 0; i < num_migrate; i++) { | |
2790 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2791 | m[i].old_family) == 0) && | |
2792 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2793 | m[i].old_family) == 0)) | |
2794 | return -EINVAL; | |
2795 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2796 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2797 | return -EINVAL; | |
2798 | ||
2799 | /* check if there is any duplicated entry */ | |
2800 | for (j = i + 1; j < num_migrate; j++) { | |
2801 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2802 | sizeof(m[i].old_daddr)) && | |
2803 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2804 | sizeof(m[i].old_saddr)) && | |
2805 | m[i].proto == m[j].proto && | |
2806 | m[i].mode == m[j].mode && | |
2807 | m[i].reqid == m[j].reqid && | |
2808 | m[i].old_family == m[j].old_family) | |
2809 | return -EINVAL; | |
2810 | } | |
2811 | } | |
2812 | ||
2813 | return 0; | |
2814 | } | |
2815 | ||
2816 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
13c1d189 AE |
2817 | struct xfrm_migrate *m, int num_migrate, |
2818 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2819 | { |
2820 | int i, err, nx_cur = 0, nx_new = 0; | |
2821 | struct xfrm_policy *pol = NULL; | |
2822 | struct xfrm_state *x, *xc; | |
2823 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2824 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2825 | struct xfrm_migrate *mp; | |
2826 | ||
2827 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2828 | goto out; | |
2829 | ||
2830 | /* Stage 1 - find policy */ | |
2831 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2832 | err = -ENOENT; | |
2833 | goto out; | |
2834 | } | |
2835 | ||
2836 | /* Stage 2 - find and update state(s) */ | |
2837 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2838 | if ((x = xfrm_migrate_state_find(mp))) { | |
2839 | x_cur[nx_cur] = x; | |
2840 | nx_cur++; | |
2841 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2842 | x_new[nx_new] = xc; | |
2843 | nx_new++; | |
2844 | } else { | |
2845 | err = -ENODATA; | |
2846 | goto restore_state; | |
2847 | } | |
2848 | } | |
2849 | } | |
2850 | ||
2851 | /* Stage 3 - update policy */ | |
2852 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2853 | goto restore_state; | |
2854 | ||
2855 | /* Stage 4 - delete old state(s) */ | |
2856 | if (nx_cur) { | |
2857 | xfrm_states_put(x_cur, nx_cur); | |
2858 | xfrm_states_delete(x_cur, nx_cur); | |
2859 | } | |
2860 | ||
2861 | /* Stage 5 - announce */ | |
13c1d189 | 2862 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2863 | |
2864 | xfrm_pol_put(pol); | |
2865 | ||
2866 | return 0; | |
2867 | out: | |
2868 | return err; | |
2869 | ||
2870 | restore_state: | |
2871 | if (pol) | |
2872 | xfrm_pol_put(pol); | |
2873 | if (nx_cur) | |
2874 | xfrm_states_put(x_cur, nx_cur); | |
2875 | if (nx_new) | |
2876 | xfrm_states_delete(x_new, nx_new); | |
2877 | ||
2878 | return err; | |
2879 | } | |
e610e679 | 2880 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2881 | #endif |