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Commit | Line | Data |
---|---|---|
a716c119 | 1 | /* |
1da177e4 LT |
2 | * xfrm_policy.c |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * Kazunori MIYAZAWA @USAGI | |
10 | * YOSHIFUJI Hideaki | |
11 | * Split up af-specific portion | |
12 | * Derek Atkins <derek@ihtfp.com> Add the post_input processor | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
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 | ||
ea2dea9d | 159 | if (unlikely(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 | { | |
12a169e7 | 300 | policy->walk.dead = 1; |
1da177e4 | 301 | |
bbb770e7 | 302 | spin_lock_bh(&xfrm_policy_gc_lock); |
2518c7c2 | 303 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
bbb770e7 | 304 | spin_unlock_bh(&xfrm_policy_gc_lock); |
1da177e4 LT |
305 | |
306 | schedule_work(&xfrm_policy_gc_work); | |
307 | } | |
308 | ||
2518c7c2 DM |
309 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
310 | ||
e92303f8 | 311 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 312 | { |
e92303f8 | 313 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
314 | } |
315 | ||
1121994c | 316 | static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir) |
2518c7c2 | 317 | { |
1121994c | 318 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
319 | unsigned int hash = __sel_hash(sel, family, hmask); |
320 | ||
321 | return (hash == hmask + 1 ? | |
1121994c AD |
322 | &net->xfrm.policy_inexact[dir] : |
323 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
324 | } |
325 | ||
1121994c | 326 | static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) |
2518c7c2 | 327 | { |
1121994c | 328 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
329 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
330 | ||
1121994c | 331 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
332 | } |
333 | ||
2518c7c2 DM |
334 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
335 | struct hlist_head *ndsttable, | |
336 | unsigned int nhashmask) | |
337 | { | |
b791160b | 338 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 339 | struct xfrm_policy *pol; |
b791160b | 340 | unsigned int h0 = 0; |
2518c7c2 | 341 | |
b791160b | 342 | redo: |
2518c7c2 DM |
343 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
344 | unsigned int h; | |
345 | ||
346 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
347 | pol->family, nhashmask); | |
b791160b YH |
348 | if (!entry0) { |
349 | hlist_del(entry); | |
350 | hlist_add_head(&pol->bydst, ndsttable+h); | |
351 | h0 = h; | |
352 | } else { | |
353 | if (h != h0) | |
354 | continue; | |
355 | hlist_del(entry); | |
356 | hlist_add_after(entry0, &pol->bydst); | |
357 | } | |
358 | entry0 = entry; | |
359 | } | |
360 | if (!hlist_empty(list)) { | |
361 | entry0 = NULL; | |
362 | goto redo; | |
2518c7c2 DM |
363 | } |
364 | } | |
365 | ||
366 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
367 | struct hlist_head *nidxtable, | |
368 | unsigned int nhashmask) | |
369 | { | |
370 | struct hlist_node *entry, *tmp; | |
371 | struct xfrm_policy *pol; | |
372 | ||
373 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
374 | unsigned int h; | |
375 | ||
376 | h = __idx_hash(pol->index, nhashmask); | |
377 | hlist_add_head(&pol->byidx, nidxtable+h); | |
378 | } | |
379 | } | |
380 | ||
381 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
382 | { | |
383 | return ((old_hmask + 1) << 1) - 1; | |
384 | } | |
385 | ||
66caf628 | 386 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 387 | { |
66caf628 | 388 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
389 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
390 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 391 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 392 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
393 | int i; |
394 | ||
395 | if (!ndst) | |
396 | return; | |
397 | ||
398 | write_lock_bh(&xfrm_policy_lock); | |
399 | ||
400 | for (i = hmask; i >= 0; i--) | |
401 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
402 | ||
66caf628 AD |
403 | net->xfrm.policy_bydst[dir].table = ndst; |
404 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 DM |
405 | |
406 | write_unlock_bh(&xfrm_policy_lock); | |
407 | ||
44e36b42 | 408 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
409 | } |
410 | ||
66caf628 | 411 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 412 | { |
66caf628 | 413 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
414 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
415 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 416 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 417 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
418 | int i; |
419 | ||
420 | if (!nidx) | |
421 | return; | |
422 | ||
423 | write_lock_bh(&xfrm_policy_lock); | |
424 | ||
425 | for (i = hmask; i >= 0; i--) | |
426 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
427 | ||
66caf628 AD |
428 | net->xfrm.policy_byidx = nidx; |
429 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 DM |
430 | |
431 | write_unlock_bh(&xfrm_policy_lock); | |
432 | ||
44e36b42 | 433 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
434 | } |
435 | ||
66caf628 | 436 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 437 | { |
66caf628 AD |
438 | unsigned int cnt = net->xfrm.policy_count[dir]; |
439 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
440 | |
441 | if (total) | |
442 | *total += cnt; | |
443 | ||
444 | if ((hmask + 1) < xfrm_policy_hashmax && | |
445 | cnt > hmask) | |
446 | return 1; | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
66caf628 | 451 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 452 | { |
66caf628 | 453 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
454 | |
455 | if ((hmask + 1) < xfrm_policy_hashmax && | |
456 | total > hmask) | |
457 | return 1; | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
e071041b | 462 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
463 | { |
464 | read_lock_bh(&xfrm_policy_lock); | |
e071041b AD |
465 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
466 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
467 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
468 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
469 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
470 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
471 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 JHS |
472 | si->spdhmcnt = xfrm_policy_hashmax; |
473 | read_unlock_bh(&xfrm_policy_lock); | |
474 | } | |
475 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 476 | |
ecfd6b18 | 477 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 478 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 479 | { |
66caf628 | 480 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
481 | int dir, total; |
482 | ||
483 | mutex_lock(&hash_resize_mutex); | |
484 | ||
485 | total = 0; | |
486 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
487 | if (xfrm_bydst_should_resize(net, dir, &total)) |
488 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 489 | } |
66caf628 AD |
490 | if (xfrm_byidx_should_resize(net, total)) |
491 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
492 | |
493 | mutex_unlock(&hash_resize_mutex); | |
494 | } | |
495 | ||
1da177e4 LT |
496 | /* Generate new index... KAME seems to generate them ordered by cost |
497 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
1121994c | 498 | static u32 xfrm_gen_index(struct net *net, int dir) |
1da177e4 | 499 | { |
1da177e4 LT |
500 | static u32 idx_generator; |
501 | ||
502 | for (;;) { | |
2518c7c2 DM |
503 | struct hlist_node *entry; |
504 | struct hlist_head *list; | |
505 | struct xfrm_policy *p; | |
506 | u32 idx; | |
507 | int found; | |
508 | ||
1da177e4 LT |
509 | idx = (idx_generator | dir); |
510 | idx_generator += 8; | |
511 | if (idx == 0) | |
512 | idx = 8; | |
1121994c | 513 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 DM |
514 | found = 0; |
515 | hlist_for_each_entry(p, entry, list, byidx) { | |
516 | if (p->index == idx) { | |
517 | found = 1; | |
1da177e4 | 518 | break; |
2518c7c2 | 519 | } |
1da177e4 | 520 | } |
2518c7c2 | 521 | if (!found) |
1da177e4 LT |
522 | return idx; |
523 | } | |
524 | } | |
525 | ||
2518c7c2 DM |
526 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
527 | { | |
528 | u32 *p1 = (u32 *) s1; | |
529 | u32 *p2 = (u32 *) s2; | |
530 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
531 | int i; | |
532 | ||
533 | for (i = 0; i < len; i++) { | |
534 | if (p1[i] != p2[i]) | |
535 | return 1; | |
536 | } | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
1da177e4 LT |
541 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
542 | { | |
1121994c | 543 | struct net *net = xp_net(policy); |
2518c7c2 DM |
544 | struct xfrm_policy *pol; |
545 | struct xfrm_policy *delpol; | |
546 | struct hlist_head *chain; | |
a6c7ab55 | 547 | struct hlist_node *entry, *newpos; |
9b78a82c | 548 | struct dst_entry *gc_list; |
34f8d884 | 549 | u32 mark = policy->mark.v & policy->mark.m; |
1da177e4 LT |
550 | |
551 | write_lock_bh(&xfrm_policy_lock); | |
1121994c | 552 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
553 | delpol = NULL; |
554 | newpos = NULL; | |
2518c7c2 | 555 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 556 | if (pol->type == policy->type && |
2518c7c2 | 557 | !selector_cmp(&pol->selector, &policy->selector) && |
34f8d884 | 558 | (mark & pol->mark.m) == pol->mark.v && |
a6c7ab55 HX |
559 | xfrm_sec_ctx_match(pol->security, policy->security) && |
560 | !WARN_ON(delpol)) { | |
1da177e4 LT |
561 | if (excl) { |
562 | write_unlock_bh(&xfrm_policy_lock); | |
563 | return -EEXIST; | |
564 | } | |
1da177e4 LT |
565 | delpol = pol; |
566 | if (policy->priority > pol->priority) | |
567 | continue; | |
568 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 569 | newpos = &pol->bydst; |
1da177e4 LT |
570 | continue; |
571 | } | |
1da177e4 LT |
572 | if (delpol) |
573 | break; | |
1da177e4 LT |
574 | } |
575 | if (newpos) | |
2518c7c2 DM |
576 | hlist_add_after(newpos, &policy->bydst); |
577 | else | |
578 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 579 | xfrm_pol_hold(policy); |
1121994c | 580 | net->xfrm.policy_count[dir]++; |
1da177e4 | 581 | atomic_inc(&flow_cache_genid); |
29fa0b30 WY |
582 | if (delpol) |
583 | __xfrm_policy_unlink(delpol, dir); | |
1121994c AD |
584 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
585 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); | |
9d729f72 | 586 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
587 | policy->curlft.use_time = 0; |
588 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
589 | xfrm_pol_hold(policy); | |
1121994c | 590 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
1da177e4 LT |
591 | write_unlock_bh(&xfrm_policy_lock); |
592 | ||
9b78a82c | 593 | if (delpol) |
1da177e4 | 594 | xfrm_policy_kill(delpol); |
1121994c AD |
595 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
596 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c DM |
597 | |
598 | read_lock_bh(&xfrm_policy_lock); | |
599 | gc_list = NULL; | |
2518c7c2 DM |
600 | entry = &policy->bydst; |
601 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
602 | struct dst_entry *dst; |
603 | ||
604 | write_lock(&policy->lock); | |
605 | dst = policy->bundles; | |
606 | if (dst) { | |
607 | struct dst_entry *tail = dst; | |
608 | while (tail->next) | |
609 | tail = tail->next; | |
610 | tail->next = gc_list; | |
611 | gc_list = dst; | |
612 | ||
613 | policy->bundles = NULL; | |
614 | } | |
615 | write_unlock(&policy->lock); | |
1da177e4 | 616 | } |
9b78a82c DM |
617 | read_unlock_bh(&xfrm_policy_lock); |
618 | ||
619 | while (gc_list) { | |
620 | struct dst_entry *dst = gc_list; | |
621 | ||
622 | gc_list = dst->next; | |
623 | dst_free(dst); | |
624 | } | |
625 | ||
1da177e4 LT |
626 | return 0; |
627 | } | |
628 | EXPORT_SYMBOL(xfrm_policy_insert); | |
629 | ||
8ca2e93b JHS |
630 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
631 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
632 | struct xfrm_sec_ctx *ctx, int delete, |
633 | int *err) | |
1da177e4 | 634 | { |
2518c7c2 DM |
635 | struct xfrm_policy *pol, *ret; |
636 | struct hlist_head *chain; | |
637 | struct hlist_node *entry; | |
1da177e4 | 638 | |
ef41aaa0 | 639 | *err = 0; |
1da177e4 | 640 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 641 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 DM |
642 | ret = NULL; |
643 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
644 | if (pol->type == type && | |
34f8d884 | 645 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
646 | !selector_cmp(sel, &pol->selector) && |
647 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 648 | xfrm_pol_hold(pol); |
2518c7c2 | 649 | if (delete) { |
03e1ad7b PM |
650 | *err = security_xfrm_policy_delete( |
651 | pol->security); | |
ef41aaa0 EP |
652 | if (*err) { |
653 | write_unlock_bh(&xfrm_policy_lock); | |
654 | return pol; | |
655 | } | |
29fa0b30 | 656 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
657 | } |
658 | ret = pol; | |
1da177e4 LT |
659 | break; |
660 | } | |
661 | } | |
662 | write_unlock_bh(&xfrm_policy_lock); | |
663 | ||
2518c7c2 | 664 | if (ret && delete) { |
1da177e4 | 665 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 666 | xfrm_policy_kill(ret); |
1da177e4 | 667 | } |
2518c7c2 | 668 | return ret; |
1da177e4 | 669 | } |
df71837d | 670 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 671 | |
8ca2e93b JHS |
672 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
673 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 674 | { |
2518c7c2 DM |
675 | struct xfrm_policy *pol, *ret; |
676 | struct hlist_head *chain; | |
677 | struct hlist_node *entry; | |
1da177e4 | 678 | |
b5505c6e HX |
679 | *err = -ENOENT; |
680 | if (xfrm_policy_id2dir(id) != dir) | |
681 | return NULL; | |
682 | ||
ef41aaa0 | 683 | *err = 0; |
1da177e4 | 684 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 685 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 DM |
686 | ret = NULL; |
687 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
34f8d884 JHS |
688 | if (pol->type == type && pol->index == id && |
689 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 690 | xfrm_pol_hold(pol); |
2518c7c2 | 691 | if (delete) { |
03e1ad7b PM |
692 | *err = security_xfrm_policy_delete( |
693 | pol->security); | |
ef41aaa0 EP |
694 | if (*err) { |
695 | write_unlock_bh(&xfrm_policy_lock); | |
696 | return pol; | |
697 | } | |
29fa0b30 | 698 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
699 | } |
700 | ret = pol; | |
1da177e4 LT |
701 | break; |
702 | } | |
703 | } | |
704 | write_unlock_bh(&xfrm_policy_lock); | |
705 | ||
2518c7c2 | 706 | if (ret && delete) { |
1da177e4 | 707 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 708 | xfrm_policy_kill(ret); |
1da177e4 | 709 | } |
2518c7c2 | 710 | return ret; |
1da177e4 LT |
711 | } |
712 | EXPORT_SYMBOL(xfrm_policy_byid); | |
713 | ||
4aa2e62c JL |
714 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
715 | static inline int | |
33ffbbd5 | 716 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 717 | { |
4aa2e62c JL |
718 | int dir, err = 0; |
719 | ||
720 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
721 | struct xfrm_policy *pol; | |
722 | struct hlist_node *entry; | |
723 | int i; | |
724 | ||
725 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 726 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
727 | if (pol->type != type) |
728 | continue; | |
03e1ad7b | 729 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 730 | if (err) { |
ab5f5e8b JL |
731 | xfrm_audit_policy_delete(pol, 0, |
732 | audit_info->loginuid, | |
2532386f | 733 | audit_info->sessionid, |
ab5f5e8b | 734 | audit_info->secid); |
4aa2e62c JL |
735 | return err; |
736 | } | |
7dc12d6d | 737 | } |
33ffbbd5 | 738 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
4aa2e62c | 739 | hlist_for_each_entry(pol, entry, |
33ffbbd5 | 740 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
741 | bydst) { |
742 | if (pol->type != type) | |
743 | continue; | |
03e1ad7b PM |
744 | err = security_xfrm_policy_delete( |
745 | pol->security); | |
4aa2e62c | 746 | if (err) { |
ab5f5e8b JL |
747 | xfrm_audit_policy_delete(pol, 0, |
748 | audit_info->loginuid, | |
2532386f | 749 | audit_info->sessionid, |
ab5f5e8b | 750 | audit_info->secid); |
4aa2e62c JL |
751 | return err; |
752 | } | |
753 | } | |
754 | } | |
755 | } | |
756 | return err; | |
757 | } | |
758 | #else | |
759 | static inline int | |
33ffbbd5 | 760 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
761 | { |
762 | return 0; | |
763 | } | |
764 | #endif | |
765 | ||
33ffbbd5 | 766 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c | 767 | { |
2f1eb65f | 768 | int dir, err = 0, cnt = 0; |
1da177e4 LT |
769 | |
770 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c | 771 | |
33ffbbd5 | 772 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
773 | if (err) |
774 | goto out; | |
775 | ||
1da177e4 | 776 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
777 | struct xfrm_policy *pol; |
778 | struct hlist_node *entry; | |
29fa0b30 | 779 | int i; |
2518c7c2 DM |
780 | |
781 | again1: | |
782 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 783 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
784 | if (pol->type != type) |
785 | continue; | |
ea2dea9d | 786 | __xfrm_policy_unlink(pol, dir); |
1da177e4 | 787 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 788 | cnt++; |
1da177e4 | 789 | |
ab5f5e8b | 790 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 791 | audit_info->sessionid, |
ab5f5e8b | 792 | audit_info->secid); |
161a09e7 | 793 | |
2518c7c2 | 794 | xfrm_policy_kill(pol); |
1da177e4 LT |
795 | |
796 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
797 | goto again1; |
798 | } | |
799 | ||
33ffbbd5 | 800 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 DM |
801 | again2: |
802 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 803 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
804 | bydst) { |
805 | if (pol->type != type) | |
806 | continue; | |
ea2dea9d | 807 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 | 808 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 809 | cnt++; |
2518c7c2 | 810 | |
ab5f5e8b JL |
811 | xfrm_audit_policy_delete(pol, 1, |
812 | audit_info->loginuid, | |
2532386f | 813 | audit_info->sessionid, |
ab5f5e8b | 814 | audit_info->secid); |
2518c7c2 DM |
815 | xfrm_policy_kill(pol); |
816 | ||
817 | write_lock_bh(&xfrm_policy_lock); | |
818 | goto again2; | |
819 | } | |
1da177e4 | 820 | } |
2518c7c2 | 821 | |
1da177e4 | 822 | } |
2f1eb65f JHS |
823 | if (!cnt) |
824 | err = -ESRCH; | |
1da177e4 | 825 | atomic_inc(&flow_cache_genid); |
4aa2e62c | 826 | out: |
1da177e4 | 827 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 828 | return err; |
1da177e4 LT |
829 | } |
830 | EXPORT_SYMBOL(xfrm_policy_flush); | |
831 | ||
cdcbca7c | 832 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 833 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
834 | void *data) |
835 | { | |
12a169e7 HX |
836 | struct xfrm_policy *pol; |
837 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
838 | int error = 0; |
839 | ||
840 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
841 | walk->type != XFRM_POLICY_TYPE_ANY) | |
842 | return -EINVAL; | |
1da177e4 | 843 | |
12a169e7 | 844 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
845 | return 0; |
846 | ||
12a169e7 HX |
847 | write_lock_bh(&xfrm_policy_lock); |
848 | if (list_empty(&walk->walk.all)) | |
cdcbca7c | 849 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
850 | else |
851 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 852 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 853 | if (x->dead) |
4c563f76 | 854 | continue; |
12a169e7 HX |
855 | pol = container_of(x, struct xfrm_policy, walk); |
856 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
857 | walk->type != pol->type) | |
858 | continue; | |
859 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
860 | walk->seq, data); | |
861 | if (error) { | |
862 | list_move_tail(&walk->walk.all, &x->all); | |
863 | goto out; | |
2518c7c2 | 864 | } |
12a169e7 | 865 | walk->seq++; |
1da177e4 | 866 | } |
12a169e7 | 867 | if (walk->seq == 0) { |
baf5d743 JHS |
868 | error = -ENOENT; |
869 | goto out; | |
870 | } | |
12a169e7 | 871 | list_del_init(&walk->walk.all); |
1da177e4 | 872 | out: |
12a169e7 | 873 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
874 | return error; |
875 | } | |
876 | EXPORT_SYMBOL(xfrm_policy_walk); | |
877 | ||
12a169e7 HX |
878 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
879 | { | |
880 | INIT_LIST_HEAD(&walk->walk.all); | |
881 | walk->walk.dead = 1; | |
882 | walk->type = type; | |
883 | walk->seq = 0; | |
884 | } | |
885 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
886 | ||
887 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
888 | { | |
889 | if (list_empty(&walk->walk.all)) | |
890 | return; | |
891 | ||
892 | write_lock_bh(&xfrm_policy_lock); | |
893 | list_del(&walk->walk.all); | |
894 | write_unlock_bh(&xfrm_policy_lock); | |
895 | } | |
896 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
897 | ||
134b0fc5 JM |
898 | /* |
899 | * Find policy to apply to this flow. | |
900 | * | |
901 | * Returns 0 if policy found, else an -errno. | |
902 | */ | |
2518c7c2 DM |
903 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
904 | u8 type, u16 family, int dir) | |
1da177e4 | 905 | { |
2518c7c2 | 906 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 907 | int match, ret = -ESRCH; |
1da177e4 | 908 | |
2518c7c2 | 909 | if (pol->family != family || |
34f8d884 | 910 | (fl->mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 911 | pol->type != type) |
134b0fc5 | 912 | return ret; |
1da177e4 | 913 | |
2518c7c2 | 914 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 915 | if (match) |
03e1ad7b PM |
916 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
917 | dir); | |
2518c7c2 | 918 | |
134b0fc5 | 919 | return ret; |
2518c7c2 | 920 | } |
1da177e4 | 921 | |
52479b62 AD |
922 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
923 | struct flowi *fl, | |
2518c7c2 DM |
924 | u16 family, u8 dir) |
925 | { | |
134b0fc5 | 926 | int err; |
2518c7c2 DM |
927 | struct xfrm_policy *pol, *ret; |
928 | xfrm_address_t *daddr, *saddr; | |
929 | struct hlist_node *entry; | |
930 | struct hlist_head *chain; | |
acba48e1 | 931 | u32 priority = ~0U; |
df71837d | 932 | |
2518c7c2 DM |
933 | daddr = xfrm_flowi_daddr(fl, family); |
934 | saddr = xfrm_flowi_saddr(fl, family); | |
935 | if (unlikely(!daddr || !saddr)) | |
936 | return NULL; | |
937 | ||
938 | read_lock_bh(&xfrm_policy_lock); | |
52479b62 | 939 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 DM |
940 | ret = NULL; |
941 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
942 | err = xfrm_policy_match(pol, fl, type, family, dir); |
943 | if (err) { | |
944 | if (err == -ESRCH) | |
945 | continue; | |
946 | else { | |
947 | ret = ERR_PTR(err); | |
948 | goto fail; | |
949 | } | |
950 | } else { | |
2518c7c2 | 951 | ret = pol; |
acba48e1 | 952 | priority = ret->priority; |
2518c7c2 DM |
953 | break; |
954 | } | |
955 | } | |
52479b62 | 956 | chain = &net->xfrm.policy_inexact[dir]; |
acba48e1 | 957 | hlist_for_each_entry(pol, entry, chain, bydst) { |
134b0fc5 JM |
958 | err = xfrm_policy_match(pol, fl, type, family, dir); |
959 | if (err) { | |
960 | if (err == -ESRCH) | |
961 | continue; | |
962 | else { | |
963 | ret = ERR_PTR(err); | |
964 | goto fail; | |
965 | } | |
966 | } else if (pol->priority < priority) { | |
acba48e1 DM |
967 | ret = pol; |
968 | break; | |
1da177e4 LT |
969 | } |
970 | } | |
acba48e1 DM |
971 | if (ret) |
972 | xfrm_pol_hold(ret); | |
134b0fc5 | 973 | fail: |
1da177e4 | 974 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 975 | |
2518c7c2 | 976 | return ret; |
4e81bb83 MN |
977 | } |
978 | ||
52479b62 AD |
979 | static int xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, |
980 | u8 dir, void **objp, atomic_t **obj_refp) | |
4e81bb83 MN |
981 | { |
982 | struct xfrm_policy *pol; | |
134b0fc5 | 983 | int err = 0; |
4e81bb83 MN |
984 | |
985 | #ifdef CONFIG_XFRM_SUB_POLICY | |
52479b62 | 986 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); |
134b0fc5 JM |
987 | if (IS_ERR(pol)) { |
988 | err = PTR_ERR(pol); | |
989 | pol = NULL; | |
990 | } | |
991 | if (pol || err) | |
4e81bb83 MN |
992 | goto end; |
993 | #endif | |
52479b62 | 994 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); |
134b0fc5 JM |
995 | if (IS_ERR(pol)) { |
996 | err = PTR_ERR(pol); | |
997 | pol = NULL; | |
998 | } | |
4e81bb83 | 999 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1000 | end: |
4e81bb83 | 1001 | #endif |
1da177e4 LT |
1002 | if ((*objp = (void *) pol) != NULL) |
1003 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1004 | return err; |
1da177e4 LT |
1005 | } |
1006 | ||
df71837d TJ |
1007 | static inline int policy_to_flow_dir(int dir) |
1008 | { | |
1009 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1010 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1011 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1012 | return dir; | |
1013 | switch (dir) { | |
1014 | default: | |
1015 | case XFRM_POLICY_IN: | |
1016 | return FLOW_DIR_IN; | |
1017 | case XFRM_POLICY_OUT: | |
1018 | return FLOW_DIR_OUT; | |
1019 | case XFRM_POLICY_FWD: | |
1020 | return FLOW_DIR_FWD; | |
3ff50b79 | 1021 | } |
df71837d TJ |
1022 | } |
1023 | ||
e0d1caa7 | 1024 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1025 | { |
1026 | struct xfrm_policy *pol; | |
1027 | ||
1028 | read_lock_bh(&xfrm_policy_lock); | |
1029 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1030 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1031 | sk->sk_family); |
a716c119 | 1032 | int err = 0; |
df71837d | 1033 | |
3bccfbc7 | 1034 | if (match) { |
34f8d884 JHS |
1035 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1036 | pol = NULL; | |
1037 | goto out; | |
1038 | } | |
03e1ad7b PM |
1039 | err = security_xfrm_policy_lookup(pol->security, |
1040 | fl->secid, | |
1041 | policy_to_flow_dir(dir)); | |
3bccfbc7 VY |
1042 | if (!err) |
1043 | xfrm_pol_hold(pol); | |
1044 | else if (err == -ESRCH) | |
1045 | pol = NULL; | |
1046 | else | |
1047 | pol = ERR_PTR(err); | |
1048 | } else | |
1da177e4 LT |
1049 | pol = NULL; |
1050 | } | |
34f8d884 | 1051 | out: |
1da177e4 LT |
1052 | read_unlock_bh(&xfrm_policy_lock); |
1053 | return pol; | |
1054 | } | |
1055 | ||
1056 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1057 | { | |
98806f75 | 1058 | struct net *net = xp_net(pol); |
1121994c | 1059 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1060 | pol->family, dir); |
4e81bb83 | 1061 | |
98806f75 | 1062 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1063 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1064 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1065 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1066 | xfrm_pol_hold(pol); |
2518c7c2 | 1067 | |
98806f75 AD |
1068 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1069 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1070 | } |
1071 | ||
1072 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1073 | int dir) | |
1074 | { | |
98806f75 AD |
1075 | struct net *net = xp_net(pol); |
1076 | ||
2518c7c2 DM |
1077 | if (hlist_unhashed(&pol->bydst)) |
1078 | return NULL; | |
1da177e4 | 1079 | |
2518c7c2 DM |
1080 | hlist_del(&pol->bydst); |
1081 | hlist_del(&pol->byidx); | |
12a169e7 | 1082 | list_del(&pol->walk.all); |
98806f75 | 1083 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1084 | |
1085 | return pol; | |
1da177e4 LT |
1086 | } |
1087 | ||
4666faab | 1088 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1089 | { |
1090 | write_lock_bh(&xfrm_policy_lock); | |
1091 | pol = __xfrm_policy_unlink(pol, dir); | |
1092 | write_unlock_bh(&xfrm_policy_lock); | |
1093 | if (pol) { | |
1094 | if (dir < XFRM_POLICY_MAX) | |
1095 | atomic_inc(&flow_cache_genid); | |
1096 | xfrm_policy_kill(pol); | |
4666faab | 1097 | return 0; |
1da177e4 | 1098 | } |
4666faab | 1099 | return -ENOENT; |
1da177e4 | 1100 | } |
a70fcb0b | 1101 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1102 | |
1103 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1104 | { | |
1121994c | 1105 | struct net *net = xp_net(pol); |
1da177e4 LT |
1106 | struct xfrm_policy *old_pol; |
1107 | ||
4e81bb83 MN |
1108 | #ifdef CONFIG_XFRM_SUB_POLICY |
1109 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1110 | return -EINVAL; | |
1111 | #endif | |
1112 | ||
1da177e4 LT |
1113 | write_lock_bh(&xfrm_policy_lock); |
1114 | old_pol = sk->sk_policy[dir]; | |
1115 | sk->sk_policy[dir] = pol; | |
1116 | if (pol) { | |
9d729f72 | 1117 | pol->curlft.add_time = get_seconds(); |
1121994c | 1118 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1119 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1120 | } | |
1121 | if (old_pol) | |
ea2dea9d TT |
1122 | /* Unlinking succeeds always. This is the only function |
1123 | * allowed to delete or replace socket policy. | |
1124 | */ | |
1da177e4 LT |
1125 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
1126 | write_unlock_bh(&xfrm_policy_lock); | |
1127 | ||
1128 | if (old_pol) { | |
1129 | xfrm_policy_kill(old_pol); | |
1130 | } | |
1131 | return 0; | |
1132 | } | |
1133 | ||
1134 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1135 | { | |
0331b1f3 | 1136 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1137 | |
1138 | if (newp) { | |
1139 | newp->selector = old->selector; | |
03e1ad7b PM |
1140 | if (security_xfrm_policy_clone(old->security, |
1141 | &newp->security)) { | |
df71837d TJ |
1142 | kfree(newp); |
1143 | return NULL; /* ENOMEM */ | |
1144 | } | |
1da177e4 LT |
1145 | newp->lft = old->lft; |
1146 | newp->curlft = old->curlft; | |
fb977e2c | 1147 | newp->mark = old->mark; |
1da177e4 LT |
1148 | newp->action = old->action; |
1149 | newp->flags = old->flags; | |
1150 | newp->xfrm_nr = old->xfrm_nr; | |
1151 | newp->index = old->index; | |
4e81bb83 | 1152 | newp->type = old->type; |
1da177e4 LT |
1153 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1154 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1155 | write_lock_bh(&xfrm_policy_lock); | |
1156 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1157 | write_unlock_bh(&xfrm_policy_lock); | |
1158 | xfrm_pol_put(newp); | |
1159 | } | |
1160 | return newp; | |
1161 | } | |
1162 | ||
1163 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1164 | { | |
1165 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1166 | *p1 = sk->sk_policy[1]; | |
1167 | ||
1168 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1169 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1170 | return -ENOMEM; | |
1171 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1172 | return -ENOMEM; | |
1173 | return 0; | |
1174 | } | |
1175 | ||
a1e59abf | 1176 | static int |
fbda33b2 | 1177 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1178 | unsigned short family) |
1179 | { | |
1180 | int err; | |
1181 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1182 | ||
1183 | if (unlikely(afinfo == NULL)) | |
1184 | return -EINVAL; | |
fbda33b2 | 1185 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1186 | xfrm_policy_put_afinfo(afinfo); |
1187 | return err; | |
1188 | } | |
1189 | ||
1da177e4 LT |
1190 | /* Resolve list of templates for the flow, given policy. */ |
1191 | ||
1192 | static int | |
4e81bb83 MN |
1193 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1194 | struct xfrm_state **xfrm, | |
1195 | unsigned short family) | |
1da177e4 | 1196 | { |
fbda33b2 | 1197 | struct net *net = xp_net(policy); |
1da177e4 LT |
1198 | int nx; |
1199 | int i, error; | |
1200 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1201 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1202 | xfrm_address_t tmp; |
1da177e4 LT |
1203 | |
1204 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1205 | struct xfrm_state *x; | |
1206 | xfrm_address_t *remote = daddr; | |
1207 | xfrm_address_t *local = saddr; | |
1208 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1209 | ||
48b8d783 JK |
1210 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1211 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1212 | remote = &tmpl->id.daddr; |
1213 | local = &tmpl->saddr; | |
76b3f055 | 1214 | family = tmpl->encap_family; |
a1e59abf | 1215 | if (xfrm_addr_any(local, family)) { |
fbda33b2 | 1216 | error = xfrm_get_saddr(net, &tmp, remote, family); |
a1e59abf PM |
1217 | if (error) |
1218 | goto fail; | |
1219 | local = &tmp; | |
1220 | } | |
1da177e4 LT |
1221 | } |
1222 | ||
1223 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1224 | ||
1225 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1226 | xfrm[nx++] = x; | |
1227 | daddr = remote; | |
1228 | saddr = local; | |
1229 | continue; | |
1230 | } | |
1231 | if (x) { | |
1232 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1233 | -EINVAL : -EAGAIN); | |
1234 | xfrm_state_put(x); | |
1235 | } | |
a4322266 | 1236 | else if (error == -ESRCH) |
1237 | error = -EAGAIN; | |
1da177e4 LT |
1238 | |
1239 | if (!tmpl->optional) | |
1240 | goto fail; | |
1241 | } | |
1242 | return nx; | |
1243 | ||
1244 | fail: | |
1245 | for (nx--; nx>=0; nx--) | |
1246 | xfrm_state_put(xfrm[nx]); | |
1247 | return error; | |
1248 | } | |
1249 | ||
4e81bb83 MN |
1250 | static int |
1251 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1252 | struct xfrm_state **xfrm, | |
1253 | unsigned short family) | |
1254 | { | |
41a49cc3 MN |
1255 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1256 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1257 | int cnx = 0; |
1258 | int error; | |
1259 | int ret; | |
1260 | int i; | |
1261 | ||
1262 | for (i = 0; i < npols; i++) { | |
1263 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1264 | error = -ENOBUFS; | |
1265 | goto fail; | |
1266 | } | |
41a49cc3 MN |
1267 | |
1268 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1269 | if (ret < 0) { |
1270 | error = ret; | |
1271 | goto fail; | |
1272 | } else | |
1273 | cnx += ret; | |
1274 | } | |
1275 | ||
41a49cc3 MN |
1276 | /* found states are sorted for outbound processing */ |
1277 | if (npols > 1) | |
1278 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1279 | ||
4e81bb83 MN |
1280 | return cnx; |
1281 | ||
1282 | fail: | |
1283 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1284 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1285 | return error; |
1286 | ||
1287 | } | |
1288 | ||
1da177e4 LT |
1289 | /* Check that the bundle accepts the flow and its components are |
1290 | * still valid. | |
1291 | */ | |
1292 | ||
1293 | static struct dst_entry * | |
1294 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1295 | { | |
1296 | struct dst_entry *x; | |
1297 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1298 | if (unlikely(afinfo == NULL)) | |
1299 | return ERR_PTR(-EINVAL); | |
1300 | x = afinfo->find_bundle(fl, policy); | |
1301 | xfrm_policy_put_afinfo(afinfo); | |
1302 | return x; | |
1303 | } | |
1304 | ||
25ee3286 HX |
1305 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1306 | { | |
1307 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1308 | int tos; | |
1da177e4 | 1309 | |
25ee3286 HX |
1310 | if (!afinfo) |
1311 | return -EINVAL; | |
1312 | ||
1313 | tos = afinfo->get_tos(fl); | |
1314 | ||
1315 | xfrm_policy_put_afinfo(afinfo); | |
1316 | ||
1317 | return tos; | |
1318 | } | |
1319 | ||
d7c7544c | 1320 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1321 | { |
1da177e4 | 1322 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1323 | struct dst_ops *dst_ops; |
25ee3286 HX |
1324 | struct xfrm_dst *xdst; |
1325 | ||
1326 | if (!afinfo) | |
1327 | return ERR_PTR(-EINVAL); | |
1328 | ||
d7c7544c AD |
1329 | switch (family) { |
1330 | case AF_INET: | |
1331 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1332 | break; | |
1333 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1334 | case AF_INET6: | |
1335 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1336 | break; | |
1337 | #endif | |
1338 | default: | |
1339 | BUG(); | |
1340 | } | |
1341 | xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS); | |
25ee3286 HX |
1342 | |
1343 | xfrm_policy_put_afinfo(afinfo); | |
1344 | ||
1345 | return xdst; | |
1346 | } | |
1347 | ||
a1b05140 MN |
1348 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1349 | int nfheader_len) | |
1350 | { | |
1351 | struct xfrm_policy_afinfo *afinfo = | |
1352 | xfrm_policy_get_afinfo(dst->ops->family); | |
1353 | int err; | |
1354 | ||
1355 | if (!afinfo) | |
1356 | return -EINVAL; | |
1357 | ||
1358 | err = afinfo->init_path(path, dst, nfheader_len); | |
1359 | ||
1360 | xfrm_policy_put_afinfo(afinfo); | |
1361 | ||
1362 | return err; | |
1363 | } | |
1364 | ||
87c1e12b HX |
1365 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
1366 | struct flowi *fl) | |
25ee3286 HX |
1367 | { |
1368 | struct xfrm_policy_afinfo *afinfo = | |
1369 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1370 | int err; | |
1371 | ||
1372 | if (!afinfo) | |
1da177e4 | 1373 | return -EINVAL; |
25ee3286 | 1374 | |
87c1e12b | 1375 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1376 | |
1da177e4 | 1377 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1378 | |
1da177e4 LT |
1379 | return err; |
1380 | } | |
1381 | ||
25ee3286 HX |
1382 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1383 | * all the metrics... Shortly, bundle a bundle. | |
1384 | */ | |
1385 | ||
1386 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1387 | struct xfrm_state **xfrm, int nx, | |
1388 | struct flowi *fl, | |
1389 | struct dst_entry *dst) | |
1390 | { | |
d7c7544c | 1391 | struct net *net = xp_net(policy); |
25ee3286 HX |
1392 | unsigned long now = jiffies; |
1393 | struct net_device *dev; | |
1394 | struct dst_entry *dst_prev = NULL; | |
1395 | struct dst_entry *dst0 = NULL; | |
1396 | int i = 0; | |
1397 | int err; | |
1398 | int header_len = 0; | |
a1b05140 | 1399 | int nfheader_len = 0; |
25ee3286 HX |
1400 | int trailer_len = 0; |
1401 | int tos; | |
1402 | int family = policy->selector.family; | |
9bb182a7 YH |
1403 | xfrm_address_t saddr, daddr; |
1404 | ||
1405 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1406 | |
1407 | tos = xfrm_get_tos(fl, family); | |
1408 | err = tos; | |
1409 | if (tos < 0) | |
1410 | goto put_states; | |
1411 | ||
1412 | dst_hold(dst); | |
1413 | ||
1414 | for (; i < nx; i++) { | |
d7c7544c | 1415 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1416 | struct dst_entry *dst1 = &xdst->u.dst; |
1417 | ||
1418 | err = PTR_ERR(xdst); | |
1419 | if (IS_ERR(xdst)) { | |
1420 | dst_release(dst); | |
1421 | goto put_states; | |
1422 | } | |
1423 | ||
1424 | if (!dst_prev) | |
1425 | dst0 = dst1; | |
1426 | else { | |
1427 | dst_prev->child = dst_clone(dst1); | |
1428 | dst1->flags |= DST_NOHASH; | |
1429 | } | |
1430 | ||
1431 | xdst->route = dst; | |
1432 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1433 | ||
1434 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1435 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1436 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1437 | family); | |
25ee3286 HX |
1438 | err = PTR_ERR(dst); |
1439 | if (IS_ERR(dst)) | |
1440 | goto put_states; | |
1441 | } else | |
1442 | dst_hold(dst); | |
1443 | ||
1444 | dst1->xfrm = xfrm[i]; | |
1445 | xdst->genid = xfrm[i]->genid; | |
1446 | ||
1447 | dst1->obsolete = -1; | |
1448 | dst1->flags |= DST_HOST; | |
1449 | dst1->lastuse = now; | |
1450 | ||
1451 | dst1->input = dst_discard; | |
1452 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1453 | ||
1454 | dst1->next = dst_prev; | |
1455 | dst_prev = dst1; | |
1456 | ||
1457 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1458 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1459 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1460 | trailer_len += xfrm[i]->props.trailer_len; |
1461 | } | |
1462 | ||
1463 | dst_prev->child = dst; | |
1464 | dst0->path = dst; | |
1465 | ||
1466 | err = -ENODEV; | |
1467 | dev = dst->dev; | |
1468 | if (!dev) | |
1469 | goto free_dst; | |
1470 | ||
96c53401 | 1471 | /* Copy neighbour for reachability confirmation */ |
25ee3286 HX |
1472 | dst0->neighbour = neigh_clone(dst->neighbour); |
1473 | ||
a1b05140 | 1474 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1475 | xfrm_init_pmtu(dst_prev); |
1476 | ||
1477 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1478 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1479 | ||
87c1e12b | 1480 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1481 | if (err) |
1482 | goto free_dst; | |
1483 | ||
1484 | dst_prev->header_len = header_len; | |
1485 | dst_prev->trailer_len = trailer_len; | |
1486 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1487 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1488 | } | |
1489 | ||
1490 | out: | |
1491 | return dst0; | |
1492 | ||
1493 | put_states: | |
1494 | for (; i < nx; i++) | |
1495 | xfrm_state_put(xfrm[i]); | |
1496 | free_dst: | |
1497 | if (dst0) | |
1498 | dst_free(dst0); | |
1499 | dst0 = ERR_PTR(err); | |
1500 | goto out; | |
1501 | } | |
1502 | ||
157bfc25 MN |
1503 | static int inline |
1504 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1505 | { | |
1506 | if (!*target) { | |
1507 | *target = kmalloc(size, GFP_ATOMIC); | |
1508 | if (!*target) | |
1509 | return -ENOMEM; | |
1510 | } | |
1511 | memcpy(*target, src, size); | |
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | static int inline | |
1516 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1517 | { | |
1518 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1519 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1520 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1521 | sel, sizeof(*sel)); | |
1522 | #else | |
1523 | return 0; | |
1524 | #endif | |
1525 | } | |
1526 | ||
1527 | static int inline | |
1528 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1529 | { | |
1530 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1531 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1532 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1533 | #else | |
1534 | return 0; | |
1535 | #endif | |
1536 | } | |
1da177e4 LT |
1537 | |
1538 | static int stale_bundle(struct dst_entry *dst); | |
1539 | ||
1540 | /* Main function: finds/creates a bundle for given flow. | |
1541 | * | |
1542 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1543 | * on interfaces with disabled IPsec. | |
1544 | */ | |
52479b62 | 1545 | int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 | 1546 | struct sock *sk, int flags) |
1da177e4 LT |
1547 | { |
1548 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1549 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1550 | int npols; | |
1551 | int pol_dead; | |
1552 | int xfrm_nr; | |
1553 | int pi; | |
1da177e4 LT |
1554 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1555 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1556 | int nx = 0; | |
1557 | int err; | |
1558 | u32 genid; | |
42cf93cd | 1559 | u16 family; |
df71837d | 1560 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1561 | |
1da177e4 LT |
1562 | restart: |
1563 | genid = atomic_read(&flow_cache_genid); | |
1564 | policy = NULL; | |
4e81bb83 MN |
1565 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1566 | pols[pi] = NULL; | |
1567 | npols = 0; | |
1568 | pol_dead = 0; | |
1569 | xfrm_nr = 0; | |
1570 | ||
f7944fb1 | 1571 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1572 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
75b8c133 | 1573 | err = PTR_ERR(policy); |
0aa64774 | 1574 | if (IS_ERR(policy)) { |
59c9940e | 1575 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
75b8c133 | 1576 | goto dropdst; |
0aa64774 | 1577 | } |
3bccfbc7 | 1578 | } |
1da177e4 LT |
1579 | |
1580 | if (!policy) { | |
1581 | /* To accelerate a bit... */ | |
2518c7c2 | 1582 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 1583 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 1584 | goto nopol; |
1da177e4 | 1585 | |
52479b62 | 1586 | policy = flow_cache_lookup(net, fl, dst_orig->ops->family, |
42cf93cd | 1587 | dir, xfrm_policy_lookup); |
75b8c133 | 1588 | err = PTR_ERR(policy); |
d66e37a9 | 1589 | if (IS_ERR(policy)) { |
59c9940e | 1590 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
75b8c133 | 1591 | goto dropdst; |
d66e37a9 | 1592 | } |
1da177e4 LT |
1593 | } |
1594 | ||
1595 | if (!policy) | |
8b7817f3 | 1596 | goto nopol; |
1da177e4 | 1597 | |
42cf93cd | 1598 | family = dst_orig->ops->family; |
4e81bb83 MN |
1599 | pols[0] = policy; |
1600 | npols ++; | |
1601 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 | 1602 | |
aef21785 | 1603 | err = -ENOENT; |
8b7817f3 HX |
1604 | if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) |
1605 | goto error; | |
1606 | ||
1607 | policy->curlft.use_time = get_seconds(); | |
1608 | ||
1da177e4 | 1609 | switch (policy->action) { |
5e5234ff | 1610 | default: |
1da177e4 LT |
1611 | case XFRM_POLICY_BLOCK: |
1612 | /* Prohibit the flow */ | |
59c9940e | 1613 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1614 | err = -EPERM; |
1615 | goto error; | |
1da177e4 LT |
1616 | |
1617 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1618 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1619 | if (policy->xfrm_nr == 0) { |
1620 | /* Flow passes not transformed. */ | |
1621 | xfrm_pol_put(policy); | |
1622 | return 0; | |
1623 | } | |
4e81bb83 | 1624 | #endif |
1da177e4 LT |
1625 | |
1626 | /* Try to find matching bundle. | |
1627 | * | |
1628 | * LATER: help from flow cache. It is optional, this | |
1629 | * is required only for output policy. | |
1630 | */ | |
1631 | dst = xfrm_find_bundle(fl, policy, family); | |
1632 | if (IS_ERR(dst)) { | |
59c9940e | 1633 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
e104411b PM |
1634 | err = PTR_ERR(dst); |
1635 | goto error; | |
1da177e4 LT |
1636 | } |
1637 | ||
1638 | if (dst) | |
1639 | break; | |
1640 | ||
4e81bb83 MN |
1641 | #ifdef CONFIG_XFRM_SUB_POLICY |
1642 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
52479b62 AD |
1643 | pols[1] = xfrm_policy_lookup_bytype(net, |
1644 | XFRM_POLICY_TYPE_MAIN, | |
4e81bb83 MN |
1645 | fl, family, |
1646 | XFRM_POLICY_OUT); | |
1647 | if (pols[1]) { | |
134b0fc5 | 1648 | if (IS_ERR(pols[1])) { |
59c9940e | 1649 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
134b0fc5 JM |
1650 | err = PTR_ERR(pols[1]); |
1651 | goto error; | |
1652 | } | |
4e81bb83 | 1653 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
59c9940e | 1654 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
4e81bb83 MN |
1655 | err = -EPERM; |
1656 | goto error; | |
1657 | } | |
1658 | npols ++; | |
1659 | xfrm_nr += pols[1]->xfrm_nr; | |
1660 | } | |
1661 | } | |
1662 | ||
1663 | /* | |
1664 | * Because neither flowi nor bundle information knows about | |
1665 | * transformation template size. On more than one policy usage | |
1666 | * we can realize whether all of them is bypass or not after | |
1667 | * they are searched. See above not-transformed bypass | |
1668 | * is surrounded by non-sub policy configuration, too. | |
1669 | */ | |
1670 | if (xfrm_nr == 0) { | |
1671 | /* Flow passes not transformed. */ | |
1672 | xfrm_pols_put(pols, npols); | |
1673 | return 0; | |
1674 | } | |
1675 | ||
1676 | #endif | |
1677 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1678 | |
1679 | if (unlikely(nx<0)) { | |
1680 | err = nx; | |
b27aeadb | 1681 | if (err == -EAGAIN && net->xfrm.sysctl_larval_drop) { |
14e50e57 DM |
1682 | /* EREMOTE tells the caller to generate |
1683 | * a one-shot blackhole route. | |
1684 | */ | |
59c9940e | 1685 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
14e50e57 DM |
1686 | xfrm_pol_put(policy); |
1687 | return -EREMOTE; | |
1688 | } | |
815f4e57 | 1689 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
1da177e4 LT |
1690 | DECLARE_WAITQUEUE(wait, current); |
1691 | ||
52479b62 | 1692 | add_wait_queue(&net->xfrm.km_waitq, &wait); |
1da177e4 LT |
1693 | set_current_state(TASK_INTERRUPTIBLE); |
1694 | schedule(); | |
1695 | set_current_state(TASK_RUNNING); | |
52479b62 | 1696 | remove_wait_queue(&net->xfrm.km_waitq, &wait); |
1da177e4 | 1697 | |
4e81bb83 | 1698 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1699 | |
1700 | if (nx == -EAGAIN && signal_pending(current)) { | |
59c9940e | 1701 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 LT |
1702 | err = -ERESTART; |
1703 | goto error; | |
1704 | } | |
1705 | if (nx == -EAGAIN || | |
1706 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1707 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1708 | goto restart; |
1709 | } | |
1710 | err = nx; | |
1711 | } | |
0aa64774 | 1712 | if (err < 0) { |
59c9940e | 1713 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 | 1714 | goto error; |
0aa64774 | 1715 | } |
1da177e4 LT |
1716 | } |
1717 | if (nx == 0) { | |
1718 | /* Flow passes not transformed. */ | |
4e81bb83 | 1719 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1720 | return 0; |
1721 | } | |
1722 | ||
25ee3286 HX |
1723 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1724 | err = PTR_ERR(dst); | |
0aa64774 | 1725 | if (IS_ERR(dst)) { |
59c9940e | 1726 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); |
1da177e4 | 1727 | goto error; |
0aa64774 | 1728 | } |
1da177e4 | 1729 | |
ea2dea9d | 1730 | for (pi = 0; pi < npols; pi++) |
12a169e7 | 1731 | pol_dead |= pols[pi]->walk.dead; |
4e81bb83 | 1732 | |
1da177e4 | 1733 | write_lock_bh(&policy->lock); |
4e81bb83 | 1734 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1735 | /* Wow! While we worked on resolving, this |
1736 | * policy has gone. Retry. It is not paranoia, | |
1737 | * we just cannot enlist new bundle to dead object. | |
1738 | * We can't enlist stable bundles either. | |
1739 | */ | |
1740 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1741 | dst_free(dst); |
00de651d | 1742 | |
0aa64774 | 1743 | if (pol_dead) |
59c9940e | 1744 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLDEAD); |
0aa64774 | 1745 | else |
59c9940e | 1746 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
00de651d HX |
1747 | err = -EHOSTUNREACH; |
1748 | goto error; | |
1da177e4 | 1749 | } |
157bfc25 MN |
1750 | |
1751 | if (npols > 1) | |
1752 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1753 | else | |
1754 | err = xfrm_dst_update_origin(dst, fl); | |
1755 | if (unlikely(err)) { | |
1756 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1757 | dst_free(dst); |
59c9940e | 1758 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
157bfc25 MN |
1759 | goto error; |
1760 | } | |
1761 | ||
1da177e4 LT |
1762 | dst->next = policy->bundles; |
1763 | policy->bundles = dst; | |
1764 | dst_hold(dst); | |
1765 | write_unlock_bh(&policy->lock); | |
1766 | } | |
1767 | *dst_p = dst; | |
1768 | dst_release(dst_orig); | |
a716c119 | 1769 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1770 | return 0; |
1771 | ||
1772 | error: | |
4e81bb83 | 1773 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1774 | dropdst: |
1775 | dst_release(dst_orig); | |
1da177e4 LT |
1776 | *dst_p = NULL; |
1777 | return err; | |
8b7817f3 HX |
1778 | |
1779 | nopol: | |
aef21785 | 1780 | err = -ENOENT; |
8b7817f3 HX |
1781 | if (flags & XFRM_LOOKUP_ICMP) |
1782 | goto dropdst; | |
1783 | return 0; | |
1da177e4 | 1784 | } |
14e50e57 DM |
1785 | EXPORT_SYMBOL(__xfrm_lookup); |
1786 | ||
52479b62 | 1787 | int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 DM |
1788 | struct sock *sk, int flags) |
1789 | { | |
52479b62 | 1790 | int err = __xfrm_lookup(net, dst_p, fl, sk, flags); |
14e50e57 DM |
1791 | |
1792 | if (err == -EREMOTE) { | |
1793 | dst_release(*dst_p); | |
1794 | *dst_p = NULL; | |
1795 | err = -EAGAIN; | |
1796 | } | |
1797 | ||
1798 | return err; | |
1799 | } | |
1da177e4 LT |
1800 | EXPORT_SYMBOL(xfrm_lookup); |
1801 | ||
df0ba92a MN |
1802 | static inline int |
1803 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1804 | { | |
1805 | struct xfrm_state *x; | |
df0ba92a MN |
1806 | |
1807 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1808 | return 0; | |
1809 | x = skb->sp->xvec[idx]; | |
1810 | if (!x->type->reject) | |
1811 | return 0; | |
1ecafede | 1812 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1813 | } |
1814 | ||
1da177e4 LT |
1815 | /* When skb is transformed back to its "native" form, we have to |
1816 | * check policy restrictions. At the moment we make this in maximally | |
1817 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1818 | * have policy cached at them. | |
1819 | */ | |
1820 | ||
1821 | static inline int | |
a716c119 | 1822 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1823 | unsigned short family) |
1824 | { | |
1825 | if (xfrm_state_kern(x)) | |
928ba416 | 1826 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1827 | return x->id.proto == tmpl->id.proto && |
1828 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1829 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1830 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1831 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1832 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1833 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1834 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1835 | } |
1836 | ||
df0ba92a MN |
1837 | /* |
1838 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1839 | * because of optional transport mode, or next index of the mathced secpath | |
1840 | * state with the template. | |
1841 | * -1 is returned when no matching template is found. | |
1842 | * Otherwise "-2 - errored_index" is returned. | |
1843 | */ | |
1da177e4 LT |
1844 | static inline int |
1845 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1846 | unsigned short family) | |
1847 | { | |
1848 | int idx = start; | |
1849 | ||
1850 | if (tmpl->optional) { | |
7e49e6de | 1851 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1852 | return start; |
1853 | } else | |
1854 | start = -1; | |
1855 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1856 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1857 | return ++idx; |
df0ba92a MN |
1858 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1859 | if (start == -1) | |
1860 | start = -2-idx; | |
1da177e4 | 1861 | break; |
df0ba92a | 1862 | } |
1da177e4 LT |
1863 | } |
1864 | return start; | |
1865 | } | |
1866 | ||
d5422efe HX |
1867 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1868 | unsigned int family, int reverse) | |
1da177e4 LT |
1869 | { |
1870 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1871 | int err; |
1da177e4 LT |
1872 | |
1873 | if (unlikely(afinfo == NULL)) | |
1874 | return -EAFNOSUPPORT; | |
1875 | ||
d5422efe | 1876 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1877 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1878 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1879 | return err; |
1da177e4 | 1880 | } |
d5422efe | 1881 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1882 | |
df0ba92a | 1883 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1884 | { |
1885 | for (; k < sp->len; k++) { | |
df0ba92a | 1886 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1887 | *idxp = k; |
1da177e4 | 1888 | return 1; |
df0ba92a | 1889 | } |
1da177e4 LT |
1890 | } |
1891 | ||
1892 | return 0; | |
1893 | } | |
1894 | ||
a716c119 | 1895 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1896 | unsigned short family) |
1897 | { | |
f6e1e25d | 1898 | struct net *net = dev_net(skb->dev); |
1da177e4 | 1899 | struct xfrm_policy *pol; |
4e81bb83 MN |
1900 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1901 | int npols = 0; | |
1902 | int xfrm_nr; | |
1903 | int pi; | |
d5422efe | 1904 | int reverse; |
1da177e4 | 1905 | struct flowi fl; |
d5422efe | 1906 | u8 fl_dir; |
df0ba92a | 1907 | int xerr_idx = -1; |
1da177e4 | 1908 | |
d5422efe HX |
1909 | reverse = dir & ~XFRM_POLICY_MASK; |
1910 | dir &= XFRM_POLICY_MASK; | |
1911 | fl_dir = policy_to_flow_dir(dir); | |
1912 | ||
0aa64774 | 1913 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 1914 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 1915 | return 0; |
0aa64774 MN |
1916 | } |
1917 | ||
eb9c7ebe | 1918 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1919 | |
1920 | /* First, check used SA against their selectors. */ | |
1921 | if (skb->sp) { | |
1922 | int i; | |
1923 | ||
1924 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 1925 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 1926 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 1927 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 1928 | return 0; |
0aa64774 | 1929 | } |
1da177e4 LT |
1930 | } |
1931 | } | |
1932 | ||
1933 | pol = NULL; | |
3bccfbc7 | 1934 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1935 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 1936 | if (IS_ERR(pol)) { |
59c9940e | 1937 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 1938 | return 0; |
0aa64774 | 1939 | } |
3bccfbc7 | 1940 | } |
1da177e4 LT |
1941 | |
1942 | if (!pol) | |
f6e1e25d | 1943 | pol = flow_cache_lookup(net, &fl, family, fl_dir, |
1da177e4 LT |
1944 | xfrm_policy_lookup); |
1945 | ||
0aa64774 | 1946 | if (IS_ERR(pol)) { |
59c9940e | 1947 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 1948 | return 0; |
0aa64774 | 1949 | } |
134b0fc5 | 1950 | |
df0ba92a | 1951 | if (!pol) { |
d1d9facf | 1952 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 1953 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 1954 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
1955 | return 0; |
1956 | } | |
1957 | return 1; | |
1958 | } | |
1da177e4 | 1959 | |
9d729f72 | 1960 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1961 | |
4e81bb83 MN |
1962 | pols[0] = pol; |
1963 | npols ++; | |
1964 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1965 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 1966 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
1967 | &fl, family, |
1968 | XFRM_POLICY_IN); | |
1969 | if (pols[1]) { | |
0aa64774 | 1970 | if (IS_ERR(pols[1])) { |
59c9940e | 1971 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 1972 | return 0; |
0aa64774 | 1973 | } |
9d729f72 | 1974 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1975 | npols ++; |
1976 | } | |
1977 | } | |
1978 | #endif | |
1979 | ||
1da177e4 LT |
1980 | if (pol->action == XFRM_POLICY_ALLOW) { |
1981 | struct sec_path *sp; | |
1982 | static struct sec_path dummy; | |
4e81bb83 | 1983 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1984 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1985 | struct xfrm_tmpl **tpp = tp; |
1986 | int ti = 0; | |
1da177e4 LT |
1987 | int i, k; |
1988 | ||
1989 | if ((sp = skb->sp) == NULL) | |
1990 | sp = &dummy; | |
1991 | ||
4e81bb83 MN |
1992 | for (pi = 0; pi < npols; pi++) { |
1993 | if (pols[pi] != pol && | |
0aa64774 | 1994 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 1995 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 1996 | goto reject; |
0aa64774 MN |
1997 | } |
1998 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 1999 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2000 | goto reject_error; |
0aa64774 | 2001 | } |
4e81bb83 MN |
2002 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2003 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2004 | } | |
2005 | xfrm_nr = ti; | |
41a49cc3 MN |
2006 | if (npols > 1) { |
2007 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2008 | tpp = stp; | |
2009 | } | |
4e81bb83 | 2010 | |
1da177e4 LT |
2011 | /* For each tunnel xfrm, find the first matching tmpl. |
2012 | * For each tmpl before that, find corresponding xfrm. | |
2013 | * Order is _important_. Later we will implement | |
2014 | * some barriers, but at the moment barriers | |
2015 | * are implied between each two transformations. | |
2016 | */ | |
4e81bb83 MN |
2017 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2018 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2019 | if (k < 0) { |
d1d9facf JM |
2020 | if (k < -1) |
2021 | /* "-2 - errored_index" returned */ | |
2022 | xerr_idx = -(2+k); | |
59c9940e | 2023 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2024 | goto reject; |
df0ba92a | 2025 | } |
1da177e4 LT |
2026 | } |
2027 | ||
0aa64774 | 2028 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2029 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2030 | goto reject; |
0aa64774 | 2031 | } |
1da177e4 | 2032 | |
4e81bb83 | 2033 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2034 | return 1; |
2035 | } | |
59c9940e | 2036 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2037 | |
2038 | reject: | |
df0ba92a | 2039 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2040 | reject_error: |
2041 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2042 | return 0; |
2043 | } | |
2044 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2045 | ||
2046 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2047 | { | |
99a66657 | 2048 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2049 | struct flowi fl; |
adf30907 ED |
2050 | struct dst_entry *dst; |
2051 | int res; | |
1da177e4 | 2052 | |
0aa64774 | 2053 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2054 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2055 | return 0; |
0aa64774 | 2056 | } |
1da177e4 | 2057 | |
adf30907 ED |
2058 | dst = skb_dst(skb); |
2059 | ||
2060 | res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0; | |
2061 | skb_dst_set(skb, dst); | |
2062 | return res; | |
1da177e4 LT |
2063 | } |
2064 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2065 | ||
d49c73c7 DM |
2066 | /* Optimize later using cookies and generation ids. */ |
2067 | ||
1da177e4 LT |
2068 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2069 | { | |
d49c73c7 DM |
2070 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2071 | * to "-1" to force all XFRM destinations to get validated by | |
2072 | * dst_ops->check on every use. We do this because when a | |
2073 | * normal route referenced by an XFRM dst is obsoleted we do | |
2074 | * not go looking around for all parent referencing XFRM dsts | |
2075 | * so that we can invalidate them. It is just too much work. | |
2076 | * Instead we make the checks here on every use. For example: | |
2077 | * | |
2078 | * XFRM dst A --> IPv4 dst X | |
2079 | * | |
2080 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2081 | * in this example). If X is marked obsolete, "A" will not | |
2082 | * notice. That's what we are validating here via the | |
2083 | * stale_bundle() check. | |
2084 | * | |
2085 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2086 | * dst which causes it's ->obsolete field to be set to a | |
2087 | * positive non-zero integer. If an XFRM dst has been pruned | |
2088 | * like this, we want to force a new route lookup. | |
399c180a | 2089 | */ |
d49c73c7 DM |
2090 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2091 | return dst; | |
2092 | ||
1da177e4 LT |
2093 | return NULL; |
2094 | } | |
2095 | ||
2096 | static int stale_bundle(struct dst_entry *dst) | |
2097 | { | |
5b368e61 | 2098 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2099 | } |
2100 | ||
aabc9761 | 2101 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2102 | { |
1da177e4 | 2103 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2104 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2105 | dev_hold(dst->dev); |
1da177e4 LT |
2106 | dev_put(dev); |
2107 | } | |
2108 | } | |
aabc9761 | 2109 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2110 | |
2111 | static void xfrm_link_failure(struct sk_buff *skb) | |
2112 | { | |
2113 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2114 | return; | |
2115 | } | |
2116 | ||
2117 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2118 | { | |
2119 | if (dst) { | |
2120 | if (dst->obsolete) { | |
2121 | dst_release(dst); | |
2122 | dst = NULL; | |
2123 | } | |
2124 | } | |
2125 | return dst; | |
2126 | } | |
2127 | ||
2518c7c2 DM |
2128 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
2129 | { | |
2130 | struct dst_entry *dst, **dstp; | |
2131 | ||
2132 | write_lock(&pol->lock); | |
2133 | dstp = &pol->bundles; | |
2134 | while ((dst=*dstp) != NULL) { | |
2135 | if (func(dst)) { | |
2136 | *dstp = dst->next; | |
2137 | dst->next = *gc_list_p; | |
2138 | *gc_list_p = dst; | |
2139 | } else { | |
2140 | dstp = &dst->next; | |
2141 | } | |
2142 | } | |
2143 | write_unlock(&pol->lock); | |
2144 | } | |
2145 | ||
3dd0b499 | 2146 | static void xfrm_prune_bundles(struct net *net, int (*func)(struct dst_entry *)) |
1da177e4 | 2147 | { |
2518c7c2 DM |
2148 | struct dst_entry *gc_list = NULL; |
2149 | int dir; | |
1da177e4 LT |
2150 | |
2151 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2152 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2153 | struct xfrm_policy *pol; | |
2154 | struct hlist_node *entry; | |
2155 | struct hlist_head *table; | |
2156 | int i; | |
4e81bb83 | 2157 | |
2518c7c2 | 2158 | hlist_for_each_entry(pol, entry, |
3dd0b499 | 2159 | &net->xfrm.policy_inexact[dir], bydst) |
2518c7c2 DM |
2160 | prune_one_bundle(pol, func, &gc_list); |
2161 | ||
3dd0b499 AD |
2162 | table = net->xfrm.policy_bydst[dir].table; |
2163 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { | |
2518c7c2 DM |
2164 | hlist_for_each_entry(pol, entry, table + i, bydst) |
2165 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2166 | } |
2167 | } | |
2168 | read_unlock_bh(&xfrm_policy_lock); | |
2169 | ||
2170 | while (gc_list) { | |
2518c7c2 | 2171 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2172 | gc_list = dst->next; |
2173 | dst_free(dst); | |
2174 | } | |
2175 | } | |
2176 | ||
2177 | static int unused_bundle(struct dst_entry *dst) | |
2178 | { | |
2179 | return !atomic_read(&dst->__refcnt); | |
2180 | } | |
2181 | ||
ddcfd796 | 2182 | static void __xfrm_garbage_collect(struct net *net) |
1da177e4 | 2183 | { |
ddcfd796 | 2184 | xfrm_prune_bundles(net, unused_bundle); |
1da177e4 LT |
2185 | } |
2186 | ||
3dd0b499 | 2187 | static int xfrm_flush_bundles(struct net *net) |
1da177e4 | 2188 | { |
3dd0b499 | 2189 | xfrm_prune_bundles(net, stale_bundle); |
1da177e4 LT |
2190 | return 0; |
2191 | } | |
2192 | ||
25ee3286 | 2193 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2194 | { |
2195 | do { | |
2196 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2197 | u32 pmtu, route_mtu_cached; | |
2198 | ||
2199 | pmtu = dst_mtu(dst->child); | |
2200 | xdst->child_mtu_cached = pmtu; | |
2201 | ||
2202 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2203 | ||
2204 | route_mtu_cached = dst_mtu(xdst->route); | |
2205 | xdst->route_mtu_cached = route_mtu_cached; | |
2206 | ||
2207 | if (pmtu > route_mtu_cached) | |
2208 | pmtu = route_mtu_cached; | |
2209 | ||
2210 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2211 | } while ((dst = dst->next)); | |
2212 | } | |
2213 | ||
1da177e4 LT |
2214 | /* Check that the bundle accepts the flow and its components are |
2215 | * still valid. | |
2216 | */ | |
2217 | ||
5b368e61 VY |
2218 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2219 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2220 | { |
2221 | struct dst_entry *dst = &first->u.dst; | |
2222 | struct xfrm_dst *last; | |
2223 | u32 mtu; | |
2224 | ||
92d63dec | 2225 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2226 | (dst->dev && !netif_running(dst->dev))) |
2227 | return 0; | |
157bfc25 MN |
2228 | #ifdef CONFIG_XFRM_SUB_POLICY |
2229 | if (fl) { | |
2230 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2231 | return 0; | |
2232 | if (first->partner && | |
2233 | !xfrm_selector_match(first->partner, fl, family)) | |
2234 | return 0; | |
2235 | } | |
2236 | #endif | |
1da177e4 LT |
2237 | |
2238 | last = NULL; | |
2239 | ||
2240 | do { | |
2241 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2242 | ||
2243 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2244 | return 0; | |
67f83cbf VY |
2245 | if (fl && pol && |
2246 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2247 | return 0; |
1da177e4 LT |
2248 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2249 | return 0; | |
9d4a706d DM |
2250 | if (xdst->genid != dst->xfrm->genid) |
2251 | return 0; | |
e53820de | 2252 | |
1bfcb10f | 2253 | if (strict && fl && |
13996378 | 2254 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2255 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2256 | return 0; | |
1da177e4 LT |
2257 | |
2258 | mtu = dst_mtu(dst->child); | |
2259 | if (xdst->child_mtu_cached != mtu) { | |
2260 | last = xdst; | |
2261 | xdst->child_mtu_cached = mtu; | |
2262 | } | |
2263 | ||
92d63dec | 2264 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2265 | return 0; |
2266 | mtu = dst_mtu(xdst->route); | |
2267 | if (xdst->route_mtu_cached != mtu) { | |
2268 | last = xdst; | |
2269 | xdst->route_mtu_cached = mtu; | |
2270 | } | |
2271 | ||
2272 | dst = dst->child; | |
2273 | } while (dst->xfrm); | |
2274 | ||
2275 | if (likely(!last)) | |
2276 | return 1; | |
2277 | ||
2278 | mtu = last->child_mtu_cached; | |
2279 | for (;;) { | |
2280 | dst = &last->u.dst; | |
2281 | ||
2282 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2283 | if (mtu > last->route_mtu_cached) | |
2284 | mtu = last->route_mtu_cached; | |
2285 | dst->metrics[RTAX_MTU-1] = mtu; | |
2286 | ||
2287 | if (last == first) | |
2288 | break; | |
2289 | ||
bd0bf076 | 2290 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2291 | last->child_mtu_cached = mtu; |
2292 | } | |
2293 | ||
2294 | return 1; | |
2295 | } | |
2296 | ||
2297 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2298 | ||
1da177e4 LT |
2299 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2300 | { | |
d7c7544c | 2301 | struct net *net; |
1da177e4 LT |
2302 | int err = 0; |
2303 | if (unlikely(afinfo == NULL)) | |
2304 | return -EINVAL; | |
2305 | if (unlikely(afinfo->family >= NPROTO)) | |
2306 | return -EAFNOSUPPORT; | |
e959d812 | 2307 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2308 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2309 | err = -ENOBUFS; | |
2310 | else { | |
2311 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2312 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2313 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2314 | if (likely(dst_ops->check == NULL)) | |
2315 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2316 | if (likely(dst_ops->negative_advice == NULL)) |
2317 | dst_ops->negative_advice = xfrm_negative_advice; | |
2318 | if (likely(dst_ops->link_failure == NULL)) | |
2319 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2320 | if (likely(afinfo->garbage_collect == NULL)) |
2321 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2322 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2323 | } | |
e959d812 | 2324 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2325 | |
2326 | rtnl_lock(); | |
2327 | for_each_net(net) { | |
2328 | struct dst_ops *xfrm_dst_ops; | |
2329 | ||
2330 | switch (afinfo->family) { | |
2331 | case AF_INET: | |
2332 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2333 | break; | |
2334 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2335 | case AF_INET6: | |
2336 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2337 | break; | |
2338 | #endif | |
2339 | default: | |
2340 | BUG(); | |
2341 | } | |
2342 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2343 | } | |
2344 | rtnl_unlock(); | |
2345 | ||
1da177e4 LT |
2346 | return err; |
2347 | } | |
2348 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2349 | ||
2350 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2351 | { | |
2352 | int err = 0; | |
2353 | if (unlikely(afinfo == NULL)) | |
2354 | return -EINVAL; | |
2355 | if (unlikely(afinfo->family >= NPROTO)) | |
2356 | return -EAFNOSUPPORT; | |
e959d812 | 2357 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2358 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2359 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2360 | err = -EINVAL; | |
2361 | else { | |
2362 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2363 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2364 | dst_ops->kmem_cachep = NULL; | |
2365 | dst_ops->check = NULL; | |
1da177e4 LT |
2366 | dst_ops->negative_advice = NULL; |
2367 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2368 | afinfo->garbage_collect = NULL; |
2369 | } | |
2370 | } | |
e959d812 | 2371 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2372 | return err; |
2373 | } | |
2374 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2375 | ||
d7c7544c AD |
2376 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2377 | { | |
2378 | struct xfrm_policy_afinfo *afinfo; | |
2379 | ||
2380 | read_lock_bh(&xfrm_policy_afinfo_lock); | |
2381 | afinfo = xfrm_policy_afinfo[AF_INET]; | |
2382 | if (afinfo) | |
2383 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
2384 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2385 | afinfo = xfrm_policy_afinfo[AF_INET6]; | |
2386 | if (afinfo) | |
2387 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2388 | #endif | |
2389 | read_unlock_bh(&xfrm_policy_afinfo_lock); | |
2390 | } | |
2391 | ||
1da177e4 LT |
2392 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
2393 | { | |
2394 | struct xfrm_policy_afinfo *afinfo; | |
2395 | if (unlikely(family >= NPROTO)) | |
2396 | return NULL; | |
2397 | read_lock(&xfrm_policy_afinfo_lock); | |
2398 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2399 | if (unlikely(!afinfo)) |
2400 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2401 | return afinfo; |
2402 | } | |
2403 | ||
2404 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2405 | { | |
546be240 HX |
2406 | read_unlock(&xfrm_policy_afinfo_lock); |
2407 | } | |
2408 | ||
1da177e4 LT |
2409 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2410 | { | |
e9dc8653 EB |
2411 | struct net_device *dev = ptr; |
2412 | ||
1da177e4 LT |
2413 | switch (event) { |
2414 | case NETDEV_DOWN: | |
3dd0b499 | 2415 | xfrm_flush_bundles(dev_net(dev)); |
1da177e4 LT |
2416 | } |
2417 | return NOTIFY_DONE; | |
2418 | } | |
2419 | ||
2420 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2421 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2422 | }; |
2423 | ||
558f82ef | 2424 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2425 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2426 | { |
c68cd1a0 AD |
2427 | int rv; |
2428 | ||
7d720c3e | 2429 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
558f82ef MN |
2430 | sizeof(struct linux_xfrm_mib)) < 0) |
2431 | return -ENOMEM; | |
c68cd1a0 AD |
2432 | rv = xfrm_proc_init(net); |
2433 | if (rv < 0) | |
7d720c3e | 2434 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
c68cd1a0 | 2435 | return rv; |
558f82ef | 2436 | } |
59c9940e AD |
2437 | |
2438 | static void xfrm_statistics_fini(struct net *net) | |
2439 | { | |
c68cd1a0 | 2440 | xfrm_proc_fini(net); |
7d720c3e | 2441 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
59c9940e AD |
2442 | } |
2443 | #else | |
2444 | static int __net_init xfrm_statistics_init(struct net *net) | |
2445 | { | |
2446 | return 0; | |
2447 | } | |
2448 | ||
2449 | static void xfrm_statistics_fini(struct net *net) | |
2450 | { | |
2451 | } | |
558f82ef MN |
2452 | #endif |
2453 | ||
d62ddc21 | 2454 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2455 | { |
2518c7c2 DM |
2456 | unsigned int hmask, sz; |
2457 | int dir; | |
2458 | ||
d62ddc21 AD |
2459 | if (net_eq(net, &init_net)) |
2460 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2461 | sizeof(struct xfrm_dst), |
e5d679f3 | 2462 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2463 | NULL); |
1da177e4 | 2464 | |
2518c7c2 DM |
2465 | hmask = 8 - 1; |
2466 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2467 | ||
93b851c1 AD |
2468 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2469 | if (!net->xfrm.policy_byidx) | |
2470 | goto out_byidx; | |
8100bea7 | 2471 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2472 | |
2473 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2474 | struct xfrm_policy_hash *htab; | |
2475 | ||
dc2caba7 | 2476 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2477 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2478 | |
a35f6c5d | 2479 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2480 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2481 | if (!htab->table) |
a35f6c5d AD |
2482 | goto out_bydst; |
2483 | htab->hmask = hmask; | |
2518c7c2 DM |
2484 | } |
2485 | ||
adfcf0b2 | 2486 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2487 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2488 | if (net_eq(net, &init_net)) |
2489 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2490 | return 0; | |
93b851c1 | 2491 | |
a35f6c5d AD |
2492 | out_bydst: |
2493 | for (dir--; dir >= 0; dir--) { | |
2494 | struct xfrm_policy_hash *htab; | |
2495 | ||
2496 | htab = &net->xfrm.policy_bydst[dir]; | |
2497 | xfrm_hash_free(htab->table, sz); | |
2498 | } | |
2499 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2500 | out_byidx: |
2501 | return -ENOMEM; | |
d62ddc21 AD |
2502 | } |
2503 | ||
2504 | static void xfrm_policy_fini(struct net *net) | |
2505 | { | |
7c2776ee | 2506 | struct xfrm_audit audit_info; |
93b851c1 | 2507 | unsigned int sz; |
8b18f8ea | 2508 | int dir; |
93b851c1 | 2509 | |
7c2776ee AD |
2510 | flush_work(&net->xfrm.policy_hash_work); |
2511 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2512 | audit_info.loginuid = -1; | |
2513 | audit_info.sessionid = -1; | |
2514 | audit_info.secid = 0; | |
2515 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2516 | #endif | |
2517 | audit_info.loginuid = -1; | |
2518 | audit_info.sessionid = -1; | |
2519 | audit_info.secid = 0; | |
2520 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
2521 | flush_work(&xfrm_policy_gc_work); | |
2522 | ||
adfcf0b2 | 2523 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2524 | |
8b18f8ea | 2525 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2526 | struct xfrm_policy_hash *htab; |
2527 | ||
8b18f8ea | 2528 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2529 | |
2530 | htab = &net->xfrm.policy_bydst[dir]; | |
2531 | sz = (htab->hmask + 1); | |
2532 | WARN_ON(!hlist_empty(htab->table)); | |
2533 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2534 | } |
2535 | ||
8100bea7 | 2536 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2537 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2538 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2539 | } |
2540 | ||
d62ddc21 AD |
2541 | static int __net_init xfrm_net_init(struct net *net) |
2542 | { | |
2543 | int rv; | |
2544 | ||
59c9940e AD |
2545 | rv = xfrm_statistics_init(net); |
2546 | if (rv < 0) | |
2547 | goto out_statistics; | |
d62ddc21 AD |
2548 | rv = xfrm_state_init(net); |
2549 | if (rv < 0) | |
2550 | goto out_state; | |
2551 | rv = xfrm_policy_init(net); | |
2552 | if (rv < 0) | |
2553 | goto out_policy; | |
d7c7544c | 2554 | xfrm_dst_ops_init(net); |
b27aeadb AD |
2555 | rv = xfrm_sysctl_init(net); |
2556 | if (rv < 0) | |
2557 | goto out_sysctl; | |
d62ddc21 AD |
2558 | return 0; |
2559 | ||
b27aeadb AD |
2560 | out_sysctl: |
2561 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2562 | out_policy: |
2563 | xfrm_state_fini(net); | |
2564 | out_state: | |
59c9940e AD |
2565 | xfrm_statistics_fini(net); |
2566 | out_statistics: | |
d62ddc21 AD |
2567 | return rv; |
2568 | } | |
2569 | ||
2570 | static void __net_exit xfrm_net_exit(struct net *net) | |
2571 | { | |
b27aeadb | 2572 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2573 | xfrm_policy_fini(net); |
2574 | xfrm_state_fini(net); | |
59c9940e | 2575 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2576 | } |
2577 | ||
2578 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2579 | .init = xfrm_net_init, | |
2580 | .exit = xfrm_net_exit, | |
2581 | }; | |
2582 | ||
1da177e4 LT |
2583 | void __init xfrm_init(void) |
2584 | { | |
d62ddc21 | 2585 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
2586 | xfrm_input_init(); |
2587 | } | |
2588 | ||
ab5f5e8b | 2589 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2590 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2591 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2592 | { |
875179fa PM |
2593 | struct xfrm_sec_ctx *ctx = xp->security; |
2594 | struct xfrm_selector *sel = &xp->selector; | |
2595 | ||
2596 | if (ctx) | |
ab5f5e8b | 2597 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2598 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2599 | |
875179fa | 2600 | switch(sel->family) { |
ab5f5e8b | 2601 | case AF_INET: |
21454aaa | 2602 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2603 | if (sel->prefixlen_s != 32) |
2604 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2605 | sel->prefixlen_s); | |
21454aaa | 2606 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2607 | if (sel->prefixlen_d != 32) |
2608 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2609 | sel->prefixlen_d); | |
ab5f5e8b JL |
2610 | break; |
2611 | case AF_INET6: | |
5b095d98 | 2612 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2613 | if (sel->prefixlen_s != 128) |
2614 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2615 | sel->prefixlen_s); | |
5b095d98 | 2616 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2617 | if (sel->prefixlen_d != 128) |
2618 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2619 | sel->prefixlen_d); | |
ab5f5e8b JL |
2620 | break; |
2621 | } | |
2622 | } | |
2623 | ||
68277acc | 2624 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2625 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2626 | { |
2627 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2628 | |
afeb14b4 | 2629 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2630 | if (audit_buf == NULL) |
2631 | return; | |
2532386f | 2632 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2633 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2634 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2635 | audit_log_end(audit_buf); | |
2636 | } | |
2637 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2638 | ||
68277acc | 2639 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2640 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2641 | { |
2642 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2643 | |
afeb14b4 | 2644 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2645 | if (audit_buf == NULL) |
2646 | return; | |
2532386f | 2647 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2648 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2649 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2650 | audit_log_end(audit_buf); | |
2651 | } | |
2652 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2653 | #endif | |
2654 | ||
80c9abaa SS |
2655 | #ifdef CONFIG_XFRM_MIGRATE |
2656 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2657 | struct xfrm_selector *sel_tgt) | |
2658 | { | |
2659 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2660 | if (sel_tgt->family == sel_cmp->family && | |
2661 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2662 | sel_cmp->family) == 0 && |
80c9abaa SS |
2663 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2664 | sel_cmp->family) == 0 && | |
2665 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2666 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2667 | return 1; | |
2668 | } | |
2669 | } else { | |
2670 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2671 | return 1; | |
2672 | } | |
2673 | } | |
2674 | return 0; | |
2675 | } | |
2676 | ||
2677 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2678 | u8 dir, u8 type) | |
2679 | { | |
2680 | struct xfrm_policy *pol, *ret = NULL; | |
2681 | struct hlist_node *entry; | |
2682 | struct hlist_head *chain; | |
2683 | u32 priority = ~0U; | |
2684 | ||
2685 | read_lock_bh(&xfrm_policy_lock); | |
1121994c | 2686 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
80c9abaa SS |
2687 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2688 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2689 | pol->type == type) { | |
2690 | ret = pol; | |
2691 | priority = ret->priority; | |
2692 | break; | |
2693 | } | |
2694 | } | |
8b18f8ea | 2695 | chain = &init_net.xfrm.policy_inexact[dir]; |
80c9abaa SS |
2696 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2697 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2698 | pol->type == type && | |
2699 | pol->priority < priority) { | |
2700 | ret = pol; | |
2701 | break; | |
2702 | } | |
2703 | } | |
2704 | ||
2705 | if (ret) | |
2706 | xfrm_pol_hold(ret); | |
2707 | ||
2708 | read_unlock_bh(&xfrm_policy_lock); | |
2709 | ||
2710 | return ret; | |
2711 | } | |
2712 | ||
2713 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2714 | { | |
2715 | int match = 0; | |
2716 | ||
2717 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2718 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2719 | switch (t->mode) { | |
2720 | case XFRM_MODE_TUNNEL: | |
2721 | case XFRM_MODE_BEET: | |
2722 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2723 | m->old_family) == 0 && | |
2724 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2725 | m->old_family) == 0) { | |
2726 | match = 1; | |
2727 | } | |
2728 | break; | |
2729 | case XFRM_MODE_TRANSPORT: | |
2730 | /* in case of transport mode, template does not store | |
2731 | any IP addresses, hence we just compare mode and | |
2732 | protocol */ | |
2733 | match = 1; | |
2734 | break; | |
2735 | default: | |
2736 | break; | |
2737 | } | |
2738 | } | |
2739 | return match; | |
2740 | } | |
2741 | ||
2742 | /* update endpoint address(es) of template(s) */ | |
2743 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2744 | struct xfrm_migrate *m, int num_migrate) | |
2745 | { | |
2746 | struct xfrm_migrate *mp; | |
2747 | struct dst_entry *dst; | |
2748 | int i, j, n = 0; | |
2749 | ||
2750 | write_lock_bh(&pol->lock); | |
12a169e7 | 2751 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2752 | /* target policy has been deleted */ |
2753 | write_unlock_bh(&pol->lock); | |
2754 | return -ENOENT; | |
2755 | } | |
2756 | ||
2757 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2758 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2759 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2760 | continue; | |
2761 | n++; | |
1bfcb10f HX |
2762 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2763 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2764 | continue; |
2765 | /* update endpoints */ | |
2766 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2767 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2768 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2769 | sizeof(pol->xfrm_vec[i].saddr)); | |
2770 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2771 | /* flush bundles */ | |
2772 | while ((dst = pol->bundles) != NULL) { | |
2773 | pol->bundles = dst->next; | |
2774 | dst_free(dst); | |
2775 | } | |
2776 | } | |
2777 | } | |
2778 | ||
2779 | write_unlock_bh(&pol->lock); | |
2780 | ||
2781 | if (!n) | |
2782 | return -ENODATA; | |
2783 | ||
2784 | return 0; | |
2785 | } | |
2786 | ||
2787 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2788 | { | |
2789 | int i, j; | |
2790 | ||
2791 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2792 | return -EINVAL; | |
2793 | ||
2794 | for (i = 0; i < num_migrate; i++) { | |
2795 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2796 | m[i].old_family) == 0) && | |
2797 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2798 | m[i].old_family) == 0)) | |
2799 | return -EINVAL; | |
2800 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2801 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2802 | return -EINVAL; | |
2803 | ||
2804 | /* check if there is any duplicated entry */ | |
2805 | for (j = i + 1; j < num_migrate; j++) { | |
2806 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2807 | sizeof(m[i].old_daddr)) && | |
2808 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2809 | sizeof(m[i].old_saddr)) && | |
2810 | m[i].proto == m[j].proto && | |
2811 | m[i].mode == m[j].mode && | |
2812 | m[i].reqid == m[j].reqid && | |
2813 | m[i].old_family == m[j].old_family) | |
2814 | return -EINVAL; | |
2815 | } | |
2816 | } | |
2817 | ||
2818 | return 0; | |
2819 | } | |
2820 | ||
2821 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
13c1d189 AE |
2822 | struct xfrm_migrate *m, int num_migrate, |
2823 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2824 | { |
2825 | int i, err, nx_cur = 0, nx_new = 0; | |
2826 | struct xfrm_policy *pol = NULL; | |
2827 | struct xfrm_state *x, *xc; | |
2828 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2829 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2830 | struct xfrm_migrate *mp; | |
2831 | ||
2832 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2833 | goto out; | |
2834 | ||
2835 | /* Stage 1 - find policy */ | |
2836 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2837 | err = -ENOENT; | |
2838 | goto out; | |
2839 | } | |
2840 | ||
2841 | /* Stage 2 - find and update state(s) */ | |
2842 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2843 | if ((x = xfrm_migrate_state_find(mp))) { | |
2844 | x_cur[nx_cur] = x; | |
2845 | nx_cur++; | |
2846 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2847 | x_new[nx_new] = xc; | |
2848 | nx_new++; | |
2849 | } else { | |
2850 | err = -ENODATA; | |
2851 | goto restore_state; | |
2852 | } | |
2853 | } | |
2854 | } | |
2855 | ||
2856 | /* Stage 3 - update policy */ | |
2857 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2858 | goto restore_state; | |
2859 | ||
2860 | /* Stage 4 - delete old state(s) */ | |
2861 | if (nx_cur) { | |
2862 | xfrm_states_put(x_cur, nx_cur); | |
2863 | xfrm_states_delete(x_cur, nx_cur); | |
2864 | } | |
2865 | ||
2866 | /* Stage 5 - announce */ | |
13c1d189 | 2867 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2868 | |
2869 | xfrm_pol_put(pol); | |
2870 | ||
2871 | return 0; | |
2872 | out: | |
2873 | return err; | |
2874 | ||
2875 | restore_state: | |
2876 | if (pol) | |
2877 | xfrm_pol_put(pol); | |
2878 | if (nx_cur) | |
2879 | xfrm_states_put(x_cur, nx_cur); | |
2880 | if (nx_new) | |
2881 | xfrm_states_delete(x_new, nx_new); | |
2882 | ||
2883 | return err; | |
2884 | } | |
e610e679 | 2885 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2886 | #endif |