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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 | ||
12a169e7 | 159 | if (xp->walk.dead) |
1da177e4 LT |
160 | goto out; |
161 | ||
77d8d7a6 | 162 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
163 | |
164 | if (xp->lft.hard_add_expires_seconds) { | |
165 | long tmo = xp->lft.hard_add_expires_seconds + | |
166 | xp->curlft.add_time - now; | |
167 | if (tmo <= 0) | |
168 | goto expired; | |
169 | if (tmo < next) | |
170 | next = tmo; | |
171 | } | |
172 | if (xp->lft.hard_use_expires_seconds) { | |
173 | long tmo = xp->lft.hard_use_expires_seconds + | |
174 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
175 | if (tmo <= 0) | |
176 | goto expired; | |
177 | if (tmo < next) | |
178 | next = tmo; | |
179 | } | |
180 | if (xp->lft.soft_add_expires_seconds) { | |
181 | long tmo = xp->lft.soft_add_expires_seconds + | |
182 | xp->curlft.add_time - now; | |
183 | if (tmo <= 0) { | |
184 | warn = 1; | |
185 | tmo = XFRM_KM_TIMEOUT; | |
186 | } | |
187 | if (tmo < next) | |
188 | next = tmo; | |
189 | } | |
190 | if (xp->lft.soft_use_expires_seconds) { | |
191 | long tmo = xp->lft.soft_use_expires_seconds + | |
192 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
193 | if (tmo <= 0) { | |
194 | warn = 1; | |
195 | tmo = XFRM_KM_TIMEOUT; | |
196 | } | |
197 | if (tmo < next) | |
198 | next = tmo; | |
199 | } | |
200 | ||
201 | if (warn) | |
6c5c8ca7 | 202 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
203 | if (next != LONG_MAX && |
204 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
205 | xfrm_pol_hold(xp); | |
206 | ||
207 | out: | |
208 | read_unlock(&xp->lock); | |
209 | xfrm_pol_put(xp); | |
210 | return; | |
211 | ||
212 | expired: | |
213 | read_unlock(&xp->lock); | |
4666faab | 214 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 215 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
216 | xfrm_pol_put(xp); |
217 | } | |
218 | ||
219 | ||
220 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
221 | * SPD calls. | |
222 | */ | |
223 | ||
0331b1f3 | 224 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
225 | { |
226 | struct xfrm_policy *policy; | |
227 | ||
0da974f4 | 228 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
229 | |
230 | if (policy) { | |
0331b1f3 | 231 | write_pnet(&policy->xp_net, net); |
12a169e7 | 232 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
233 | INIT_HLIST_NODE(&policy->bydst); |
234 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 235 | rwlock_init(&policy->lock); |
2518c7c2 | 236 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
237 | setup_timer(&policy->timer, xfrm_policy_timer, |
238 | (unsigned long)policy); | |
1da177e4 LT |
239 | } |
240 | return policy; | |
241 | } | |
242 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
243 | ||
244 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
245 | ||
64c31b3f | 246 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 247 | { |
12a169e7 | 248 | BUG_ON(!policy->walk.dead); |
1da177e4 | 249 | |
09a62660 | 250 | BUG_ON(policy->bundles); |
1da177e4 LT |
251 | |
252 | if (del_timer(&policy->timer)) | |
253 | BUG(); | |
254 | ||
03e1ad7b | 255 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
256 | kfree(policy); |
257 | } | |
64c31b3f | 258 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 LT |
259 | |
260 | static void xfrm_policy_gc_kill(struct xfrm_policy *policy) | |
261 | { | |
262 | struct dst_entry *dst; | |
263 | ||
264 | while ((dst = policy->bundles) != NULL) { | |
265 | policy->bundles = dst->next; | |
266 | dst_free(dst); | |
267 | } | |
268 | ||
269 | if (del_timer(&policy->timer)) | |
270 | atomic_dec(&policy->refcnt); | |
271 | ||
272 | if (atomic_read(&policy->refcnt) > 1) | |
273 | flow_cache_flush(); | |
274 | ||
275 | xfrm_pol_put(policy); | |
276 | } | |
277 | ||
c4028958 | 278 | static void xfrm_policy_gc_task(struct work_struct *work) |
1da177e4 LT |
279 | { |
280 | struct xfrm_policy *policy; | |
2518c7c2 DM |
281 | struct hlist_node *entry, *tmp; |
282 | struct hlist_head gc_list; | |
1da177e4 LT |
283 | |
284 | spin_lock_bh(&xfrm_policy_gc_lock); | |
2518c7c2 DM |
285 | gc_list.first = xfrm_policy_gc_list.first; |
286 | INIT_HLIST_HEAD(&xfrm_policy_gc_list); | |
1da177e4 LT |
287 | spin_unlock_bh(&xfrm_policy_gc_lock); |
288 | ||
2518c7c2 | 289 | hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst) |
1da177e4 | 290 | xfrm_policy_gc_kill(policy); |
1da177e4 | 291 | } |
c9583969 | 292 | static DECLARE_WORK(xfrm_policy_gc_work, xfrm_policy_gc_task); |
1da177e4 LT |
293 | |
294 | /* Rule must be locked. Release descentant resources, announce | |
295 | * entry dead. The rule must be unlinked from lists to the moment. | |
296 | */ | |
297 | ||
298 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
299 | { | |
300 | int dead; | |
301 | ||
302 | write_lock_bh(&policy->lock); | |
12a169e7 HX |
303 | dead = policy->walk.dead; |
304 | policy->walk.dead = 1; | |
1da177e4 LT |
305 | write_unlock_bh(&policy->lock); |
306 | ||
307 | if (unlikely(dead)) { | |
308 | WARN_ON(1); | |
309 | return; | |
310 | } | |
311 | ||
bbb770e7 | 312 | spin_lock_bh(&xfrm_policy_gc_lock); |
2518c7c2 | 313 | hlist_add_head(&policy->bydst, &xfrm_policy_gc_list); |
bbb770e7 | 314 | spin_unlock_bh(&xfrm_policy_gc_lock); |
1da177e4 LT |
315 | |
316 | schedule_work(&xfrm_policy_gc_work); | |
317 | } | |
318 | ||
2518c7c2 DM |
319 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
320 | ||
e92303f8 | 321 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 322 | { |
e92303f8 | 323 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
324 | } |
325 | ||
1121994c | 326 | static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir) |
2518c7c2 | 327 | { |
1121994c | 328 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
329 | unsigned int hash = __sel_hash(sel, family, hmask); |
330 | ||
331 | return (hash == hmask + 1 ? | |
1121994c AD |
332 | &net->xfrm.policy_inexact[dir] : |
333 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
334 | } |
335 | ||
1121994c | 336 | static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) |
2518c7c2 | 337 | { |
1121994c | 338 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
339 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
340 | ||
1121994c | 341 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
342 | } |
343 | ||
2518c7c2 DM |
344 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
345 | struct hlist_head *ndsttable, | |
346 | unsigned int nhashmask) | |
347 | { | |
b791160b | 348 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 349 | struct xfrm_policy *pol; |
b791160b | 350 | unsigned int h0 = 0; |
2518c7c2 | 351 | |
b791160b | 352 | redo: |
2518c7c2 DM |
353 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
354 | unsigned int h; | |
355 | ||
356 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
357 | pol->family, nhashmask); | |
b791160b YH |
358 | if (!entry0) { |
359 | hlist_del(entry); | |
360 | hlist_add_head(&pol->bydst, ndsttable+h); | |
361 | h0 = h; | |
362 | } else { | |
363 | if (h != h0) | |
364 | continue; | |
365 | hlist_del(entry); | |
366 | hlist_add_after(entry0, &pol->bydst); | |
367 | } | |
368 | entry0 = entry; | |
369 | } | |
370 | if (!hlist_empty(list)) { | |
371 | entry0 = NULL; | |
372 | goto redo; | |
2518c7c2 DM |
373 | } |
374 | } | |
375 | ||
376 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
377 | struct hlist_head *nidxtable, | |
378 | unsigned int nhashmask) | |
379 | { | |
380 | struct hlist_node *entry, *tmp; | |
381 | struct xfrm_policy *pol; | |
382 | ||
383 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
384 | unsigned int h; | |
385 | ||
386 | h = __idx_hash(pol->index, nhashmask); | |
387 | hlist_add_head(&pol->byidx, nidxtable+h); | |
388 | } | |
389 | } | |
390 | ||
391 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
392 | { | |
393 | return ((old_hmask + 1) << 1) - 1; | |
394 | } | |
395 | ||
66caf628 | 396 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 397 | { |
66caf628 | 398 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
399 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
400 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 401 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 402 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
403 | int i; |
404 | ||
405 | if (!ndst) | |
406 | return; | |
407 | ||
408 | write_lock_bh(&xfrm_policy_lock); | |
409 | ||
410 | for (i = hmask; i >= 0; i--) | |
411 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
412 | ||
66caf628 AD |
413 | net->xfrm.policy_bydst[dir].table = ndst; |
414 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 DM |
415 | |
416 | write_unlock_bh(&xfrm_policy_lock); | |
417 | ||
44e36b42 | 418 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
419 | } |
420 | ||
66caf628 | 421 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 422 | { |
66caf628 | 423 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
424 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
425 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 426 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 427 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
428 | int i; |
429 | ||
430 | if (!nidx) | |
431 | return; | |
432 | ||
433 | write_lock_bh(&xfrm_policy_lock); | |
434 | ||
435 | for (i = hmask; i >= 0; i--) | |
436 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
437 | ||
66caf628 AD |
438 | net->xfrm.policy_byidx = nidx; |
439 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 DM |
440 | |
441 | write_unlock_bh(&xfrm_policy_lock); | |
442 | ||
44e36b42 | 443 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
444 | } |
445 | ||
66caf628 | 446 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 447 | { |
66caf628 AD |
448 | unsigned int cnt = net->xfrm.policy_count[dir]; |
449 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
450 | |
451 | if (total) | |
452 | *total += cnt; | |
453 | ||
454 | if ((hmask + 1) < xfrm_policy_hashmax && | |
455 | cnt > hmask) | |
456 | return 1; | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
66caf628 | 461 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 462 | { |
66caf628 | 463 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
464 | |
465 | if ((hmask + 1) < xfrm_policy_hashmax && | |
466 | total > hmask) | |
467 | return 1; | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
e071041b | 472 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
473 | { |
474 | read_lock_bh(&xfrm_policy_lock); | |
e071041b AD |
475 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
476 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
477 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
478 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
479 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
480 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
481 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 JHS |
482 | si->spdhmcnt = xfrm_policy_hashmax; |
483 | read_unlock_bh(&xfrm_policy_lock); | |
484 | } | |
485 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 486 | |
ecfd6b18 | 487 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 488 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 489 | { |
66caf628 | 490 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
491 | int dir, total; |
492 | ||
493 | mutex_lock(&hash_resize_mutex); | |
494 | ||
495 | total = 0; | |
496 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
497 | if (xfrm_bydst_should_resize(net, dir, &total)) |
498 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 499 | } |
66caf628 AD |
500 | if (xfrm_byidx_should_resize(net, total)) |
501 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
502 | |
503 | mutex_unlock(&hash_resize_mutex); | |
504 | } | |
505 | ||
1da177e4 LT |
506 | /* Generate new index... KAME seems to generate them ordered by cost |
507 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
1121994c | 508 | static u32 xfrm_gen_index(struct net *net, int dir) |
1da177e4 | 509 | { |
1da177e4 LT |
510 | static u32 idx_generator; |
511 | ||
512 | for (;;) { | |
2518c7c2 DM |
513 | struct hlist_node *entry; |
514 | struct hlist_head *list; | |
515 | struct xfrm_policy *p; | |
516 | u32 idx; | |
517 | int found; | |
518 | ||
1da177e4 LT |
519 | idx = (idx_generator | dir); |
520 | idx_generator += 8; | |
521 | if (idx == 0) | |
522 | idx = 8; | |
1121994c | 523 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 DM |
524 | found = 0; |
525 | hlist_for_each_entry(p, entry, list, byidx) { | |
526 | if (p->index == idx) { | |
527 | found = 1; | |
1da177e4 | 528 | break; |
2518c7c2 | 529 | } |
1da177e4 | 530 | } |
2518c7c2 | 531 | if (!found) |
1da177e4 LT |
532 | return idx; |
533 | } | |
534 | } | |
535 | ||
2518c7c2 DM |
536 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
537 | { | |
538 | u32 *p1 = (u32 *) s1; | |
539 | u32 *p2 = (u32 *) s2; | |
540 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
541 | int i; | |
542 | ||
543 | for (i = 0; i < len; i++) { | |
544 | if (p1[i] != p2[i]) | |
545 | return 1; | |
546 | } | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
1da177e4 LT |
551 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
552 | { | |
1121994c | 553 | struct net *net = xp_net(policy); |
2518c7c2 DM |
554 | struct xfrm_policy *pol; |
555 | struct xfrm_policy *delpol; | |
556 | struct hlist_head *chain; | |
a6c7ab55 | 557 | struct hlist_node *entry, *newpos; |
9b78a82c | 558 | struct dst_entry *gc_list; |
34f8d884 | 559 | u32 mark = policy->mark.v & policy->mark.m; |
1da177e4 LT |
560 | |
561 | write_lock_bh(&xfrm_policy_lock); | |
1121994c | 562 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
563 | delpol = NULL; |
564 | newpos = NULL; | |
2518c7c2 | 565 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 566 | if (pol->type == policy->type && |
2518c7c2 | 567 | !selector_cmp(&pol->selector, &policy->selector) && |
34f8d884 | 568 | (mark & pol->mark.m) == pol->mark.v && |
a6c7ab55 HX |
569 | xfrm_sec_ctx_match(pol->security, policy->security) && |
570 | !WARN_ON(delpol)) { | |
1da177e4 LT |
571 | if (excl) { |
572 | write_unlock_bh(&xfrm_policy_lock); | |
573 | return -EEXIST; | |
574 | } | |
1da177e4 LT |
575 | delpol = pol; |
576 | if (policy->priority > pol->priority) | |
577 | continue; | |
578 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 579 | newpos = &pol->bydst; |
1da177e4 LT |
580 | continue; |
581 | } | |
1da177e4 LT |
582 | if (delpol) |
583 | break; | |
1da177e4 LT |
584 | } |
585 | if (newpos) | |
2518c7c2 DM |
586 | hlist_add_after(newpos, &policy->bydst); |
587 | else | |
588 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 589 | xfrm_pol_hold(policy); |
1121994c | 590 | net->xfrm.policy_count[dir]++; |
1da177e4 | 591 | atomic_inc(&flow_cache_genid); |
29fa0b30 WY |
592 | if (delpol) |
593 | __xfrm_policy_unlink(delpol, dir); | |
1121994c AD |
594 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
595 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); | |
9d729f72 | 596 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
597 | policy->curlft.use_time = 0; |
598 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
599 | xfrm_pol_hold(policy); | |
1121994c | 600 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
1da177e4 LT |
601 | write_unlock_bh(&xfrm_policy_lock); |
602 | ||
9b78a82c | 603 | if (delpol) |
1da177e4 | 604 | xfrm_policy_kill(delpol); |
1121994c AD |
605 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
606 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c DM |
607 | |
608 | read_lock_bh(&xfrm_policy_lock); | |
609 | gc_list = NULL; | |
2518c7c2 DM |
610 | entry = &policy->bydst; |
611 | hlist_for_each_entry_continue(policy, entry, bydst) { | |
9b78a82c DM |
612 | struct dst_entry *dst; |
613 | ||
614 | write_lock(&policy->lock); | |
615 | dst = policy->bundles; | |
616 | if (dst) { | |
617 | struct dst_entry *tail = dst; | |
618 | while (tail->next) | |
619 | tail = tail->next; | |
620 | tail->next = gc_list; | |
621 | gc_list = dst; | |
622 | ||
623 | policy->bundles = NULL; | |
624 | } | |
625 | write_unlock(&policy->lock); | |
1da177e4 | 626 | } |
9b78a82c DM |
627 | read_unlock_bh(&xfrm_policy_lock); |
628 | ||
629 | while (gc_list) { | |
630 | struct dst_entry *dst = gc_list; | |
631 | ||
632 | gc_list = dst->next; | |
633 | dst_free(dst); | |
634 | } | |
635 | ||
1da177e4 LT |
636 | return 0; |
637 | } | |
638 | EXPORT_SYMBOL(xfrm_policy_insert); | |
639 | ||
8ca2e93b JHS |
640 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
641 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
642 | struct xfrm_sec_ctx *ctx, int delete, |
643 | int *err) | |
1da177e4 | 644 | { |
2518c7c2 DM |
645 | struct xfrm_policy *pol, *ret; |
646 | struct hlist_head *chain; | |
647 | struct hlist_node *entry; | |
1da177e4 | 648 | |
ef41aaa0 | 649 | *err = 0; |
1da177e4 | 650 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 651 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 DM |
652 | ret = NULL; |
653 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
654 | if (pol->type == type && | |
34f8d884 | 655 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
656 | !selector_cmp(sel, &pol->selector) && |
657 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 658 | xfrm_pol_hold(pol); |
2518c7c2 | 659 | if (delete) { |
03e1ad7b PM |
660 | *err = security_xfrm_policy_delete( |
661 | pol->security); | |
ef41aaa0 EP |
662 | if (*err) { |
663 | write_unlock_bh(&xfrm_policy_lock); | |
664 | return pol; | |
665 | } | |
29fa0b30 | 666 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
667 | } |
668 | ret = pol; | |
1da177e4 LT |
669 | break; |
670 | } | |
671 | } | |
672 | write_unlock_bh(&xfrm_policy_lock); | |
673 | ||
2518c7c2 | 674 | if (ret && delete) { |
1da177e4 | 675 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 676 | xfrm_policy_kill(ret); |
1da177e4 | 677 | } |
2518c7c2 | 678 | return ret; |
1da177e4 | 679 | } |
df71837d | 680 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 681 | |
8ca2e93b JHS |
682 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
683 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 684 | { |
2518c7c2 DM |
685 | struct xfrm_policy *pol, *ret; |
686 | struct hlist_head *chain; | |
687 | struct hlist_node *entry; | |
1da177e4 | 688 | |
b5505c6e HX |
689 | *err = -ENOENT; |
690 | if (xfrm_policy_id2dir(id) != dir) | |
691 | return NULL; | |
692 | ||
ef41aaa0 | 693 | *err = 0; |
1da177e4 | 694 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 695 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 DM |
696 | ret = NULL; |
697 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
34f8d884 JHS |
698 | if (pol->type == type && pol->index == id && |
699 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 700 | xfrm_pol_hold(pol); |
2518c7c2 | 701 | if (delete) { |
03e1ad7b PM |
702 | *err = security_xfrm_policy_delete( |
703 | pol->security); | |
ef41aaa0 EP |
704 | if (*err) { |
705 | write_unlock_bh(&xfrm_policy_lock); | |
706 | return pol; | |
707 | } | |
29fa0b30 | 708 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
709 | } |
710 | ret = pol; | |
1da177e4 LT |
711 | break; |
712 | } | |
713 | } | |
714 | write_unlock_bh(&xfrm_policy_lock); | |
715 | ||
2518c7c2 | 716 | if (ret && delete) { |
1da177e4 | 717 | atomic_inc(&flow_cache_genid); |
2518c7c2 | 718 | xfrm_policy_kill(ret); |
1da177e4 | 719 | } |
2518c7c2 | 720 | return ret; |
1da177e4 LT |
721 | } |
722 | EXPORT_SYMBOL(xfrm_policy_byid); | |
723 | ||
4aa2e62c JL |
724 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
725 | static inline int | |
33ffbbd5 | 726 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 727 | { |
4aa2e62c JL |
728 | int dir, err = 0; |
729 | ||
730 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
731 | struct xfrm_policy *pol; | |
732 | struct hlist_node *entry; | |
733 | int i; | |
734 | ||
735 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 736 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
737 | if (pol->type != type) |
738 | continue; | |
03e1ad7b | 739 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 740 | if (err) { |
ab5f5e8b JL |
741 | xfrm_audit_policy_delete(pol, 0, |
742 | audit_info->loginuid, | |
2532386f | 743 | audit_info->sessionid, |
ab5f5e8b | 744 | audit_info->secid); |
4aa2e62c JL |
745 | return err; |
746 | } | |
7dc12d6d | 747 | } |
33ffbbd5 | 748 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
4aa2e62c | 749 | hlist_for_each_entry(pol, entry, |
33ffbbd5 | 750 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
751 | bydst) { |
752 | if (pol->type != type) | |
753 | continue; | |
03e1ad7b PM |
754 | err = security_xfrm_policy_delete( |
755 | pol->security); | |
4aa2e62c | 756 | if (err) { |
ab5f5e8b JL |
757 | xfrm_audit_policy_delete(pol, 0, |
758 | audit_info->loginuid, | |
2532386f | 759 | audit_info->sessionid, |
ab5f5e8b | 760 | audit_info->secid); |
4aa2e62c JL |
761 | return err; |
762 | } | |
763 | } | |
764 | } | |
765 | } | |
766 | return err; | |
767 | } | |
768 | #else | |
769 | static inline int | |
33ffbbd5 | 770 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
771 | { |
772 | return 0; | |
773 | } | |
774 | #endif | |
775 | ||
33ffbbd5 | 776 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c | 777 | { |
2f1eb65f JHS |
778 | int dir, err = 0, cnt = 0; |
779 | struct xfrm_policy *dp; | |
1da177e4 LT |
780 | |
781 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c | 782 | |
33ffbbd5 | 783 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
784 | if (err) |
785 | goto out; | |
786 | ||
1da177e4 | 787 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
788 | struct xfrm_policy *pol; |
789 | struct hlist_node *entry; | |
29fa0b30 | 790 | int i; |
2518c7c2 DM |
791 | |
792 | again1: | |
793 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 794 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
795 | if (pol->type != type) |
796 | continue; | |
2f1eb65f | 797 | dp = __xfrm_policy_unlink(pol, dir); |
1da177e4 | 798 | write_unlock_bh(&xfrm_policy_lock); |
2f1eb65f JHS |
799 | if (dp) |
800 | cnt++; | |
1da177e4 | 801 | |
ab5f5e8b | 802 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 803 | audit_info->sessionid, |
ab5f5e8b | 804 | audit_info->secid); |
161a09e7 | 805 | |
2518c7c2 | 806 | xfrm_policy_kill(pol); |
1da177e4 LT |
807 | |
808 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
809 | goto again1; |
810 | } | |
811 | ||
33ffbbd5 | 812 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 DM |
813 | again2: |
814 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 815 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
816 | bydst) { |
817 | if (pol->type != type) | |
818 | continue; | |
2f1eb65f | 819 | dp = __xfrm_policy_unlink(pol, dir); |
2518c7c2 | 820 | write_unlock_bh(&xfrm_policy_lock); |
2f1eb65f JHS |
821 | if (dp) |
822 | cnt++; | |
2518c7c2 | 823 | |
ab5f5e8b JL |
824 | xfrm_audit_policy_delete(pol, 1, |
825 | audit_info->loginuid, | |
2532386f | 826 | audit_info->sessionid, |
ab5f5e8b | 827 | audit_info->secid); |
2518c7c2 DM |
828 | xfrm_policy_kill(pol); |
829 | ||
830 | write_lock_bh(&xfrm_policy_lock); | |
831 | goto again2; | |
832 | } | |
1da177e4 | 833 | } |
2518c7c2 | 834 | |
1da177e4 | 835 | } |
2f1eb65f JHS |
836 | if (!cnt) |
837 | err = -ESRCH; | |
1da177e4 | 838 | atomic_inc(&flow_cache_genid); |
4aa2e62c | 839 | out: |
1da177e4 | 840 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 841 | return err; |
1da177e4 LT |
842 | } |
843 | EXPORT_SYMBOL(xfrm_policy_flush); | |
844 | ||
cdcbca7c | 845 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 846 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
847 | void *data) |
848 | { | |
12a169e7 HX |
849 | struct xfrm_policy *pol; |
850 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
851 | int error = 0; |
852 | ||
853 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
854 | walk->type != XFRM_POLICY_TYPE_ANY) | |
855 | return -EINVAL; | |
1da177e4 | 856 | |
12a169e7 | 857 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
858 | return 0; |
859 | ||
12a169e7 HX |
860 | write_lock_bh(&xfrm_policy_lock); |
861 | if (list_empty(&walk->walk.all)) | |
cdcbca7c | 862 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
863 | else |
864 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 865 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 866 | if (x->dead) |
4c563f76 | 867 | continue; |
12a169e7 HX |
868 | pol = container_of(x, struct xfrm_policy, walk); |
869 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
870 | walk->type != pol->type) | |
871 | continue; | |
872 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
873 | walk->seq, data); | |
874 | if (error) { | |
875 | list_move_tail(&walk->walk.all, &x->all); | |
876 | goto out; | |
2518c7c2 | 877 | } |
12a169e7 | 878 | walk->seq++; |
1da177e4 | 879 | } |
12a169e7 | 880 | if (walk->seq == 0) { |
baf5d743 JHS |
881 | error = -ENOENT; |
882 | goto out; | |
883 | } | |
12a169e7 | 884 | list_del_init(&walk->walk.all); |
1da177e4 | 885 | out: |
12a169e7 | 886 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
887 | return error; |
888 | } | |
889 | EXPORT_SYMBOL(xfrm_policy_walk); | |
890 | ||
12a169e7 HX |
891 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
892 | { | |
893 | INIT_LIST_HEAD(&walk->walk.all); | |
894 | walk->walk.dead = 1; | |
895 | walk->type = type; | |
896 | walk->seq = 0; | |
897 | } | |
898 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
899 | ||
900 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
901 | { | |
902 | if (list_empty(&walk->walk.all)) | |
903 | return; | |
904 | ||
905 | write_lock_bh(&xfrm_policy_lock); | |
906 | list_del(&walk->walk.all); | |
907 | write_unlock_bh(&xfrm_policy_lock); | |
908 | } | |
909 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
910 | ||
134b0fc5 JM |
911 | /* |
912 | * Find policy to apply to this flow. | |
913 | * | |
914 | * Returns 0 if policy found, else an -errno. | |
915 | */ | |
2518c7c2 DM |
916 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
917 | u8 type, u16 family, int dir) | |
1da177e4 | 918 | { |
2518c7c2 | 919 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 920 | int match, ret = -ESRCH; |
1da177e4 | 921 | |
2518c7c2 | 922 | if (pol->family != family || |
34f8d884 | 923 | (fl->mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 924 | pol->type != type) |
134b0fc5 | 925 | return ret; |
1da177e4 | 926 | |
2518c7c2 | 927 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 928 | if (match) |
03e1ad7b PM |
929 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
930 | dir); | |
2518c7c2 | 931 | |
134b0fc5 | 932 | return ret; |
2518c7c2 | 933 | } |
1da177e4 | 934 | |
52479b62 AD |
935 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
936 | struct flowi *fl, | |
2518c7c2 DM |
937 | u16 family, u8 dir) |
938 | { | |
134b0fc5 | 939 | int err; |
2518c7c2 DM |
940 | struct xfrm_policy *pol, *ret; |
941 | xfrm_address_t *daddr, *saddr; | |
942 | struct hlist_node *entry; | |
943 | struct hlist_head *chain; | |
acba48e1 | 944 | u32 priority = ~0U; |
df71837d | 945 | |
2518c7c2 DM |
946 | daddr = xfrm_flowi_daddr(fl, family); |
947 | saddr = xfrm_flowi_saddr(fl, family); | |
948 | if (unlikely(!daddr || !saddr)) | |
949 | return NULL; | |
950 | ||
951 | read_lock_bh(&xfrm_policy_lock); | |
52479b62 | 952 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 DM |
953 | ret = NULL; |
954 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
955 | err = xfrm_policy_match(pol, fl, type, family, dir); |
956 | if (err) { | |
957 | if (err == -ESRCH) | |
958 | continue; | |
959 | else { | |
960 | ret = ERR_PTR(err); | |
961 | goto fail; | |
962 | } | |
963 | } else { | |
2518c7c2 | 964 | ret = pol; |
acba48e1 | 965 | priority = ret->priority; |
2518c7c2 DM |
966 | break; |
967 | } | |
968 | } | |
52479b62 | 969 | chain = &net->xfrm.policy_inexact[dir]; |
acba48e1 | 970 | hlist_for_each_entry(pol, entry, chain, bydst) { |
134b0fc5 JM |
971 | err = xfrm_policy_match(pol, fl, type, family, dir); |
972 | if (err) { | |
973 | if (err == -ESRCH) | |
974 | continue; | |
975 | else { | |
976 | ret = ERR_PTR(err); | |
977 | goto fail; | |
978 | } | |
979 | } else if (pol->priority < priority) { | |
acba48e1 DM |
980 | ret = pol; |
981 | break; | |
1da177e4 LT |
982 | } |
983 | } | |
acba48e1 DM |
984 | if (ret) |
985 | xfrm_pol_hold(ret); | |
134b0fc5 | 986 | fail: |
1da177e4 | 987 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 988 | |
2518c7c2 | 989 | return ret; |
4e81bb83 MN |
990 | } |
991 | ||
52479b62 AD |
992 | static int xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, |
993 | u8 dir, void **objp, atomic_t **obj_refp) | |
4e81bb83 MN |
994 | { |
995 | struct xfrm_policy *pol; | |
134b0fc5 | 996 | int err = 0; |
4e81bb83 MN |
997 | |
998 | #ifdef CONFIG_XFRM_SUB_POLICY | |
52479b62 | 999 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); |
134b0fc5 JM |
1000 | if (IS_ERR(pol)) { |
1001 | err = PTR_ERR(pol); | |
1002 | pol = NULL; | |
1003 | } | |
1004 | if (pol || err) | |
4e81bb83 MN |
1005 | goto end; |
1006 | #endif | |
52479b62 | 1007 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); |
134b0fc5 JM |
1008 | if (IS_ERR(pol)) { |
1009 | err = PTR_ERR(pol); | |
1010 | pol = NULL; | |
1011 | } | |
4e81bb83 | 1012 | #ifdef CONFIG_XFRM_SUB_POLICY |
2518c7c2 | 1013 | end: |
4e81bb83 | 1014 | #endif |
1da177e4 LT |
1015 | if ((*objp = (void *) pol) != NULL) |
1016 | *obj_refp = &pol->refcnt; | |
134b0fc5 | 1017 | return err; |
1da177e4 LT |
1018 | } |
1019 | ||
df71837d TJ |
1020 | static inline int policy_to_flow_dir(int dir) |
1021 | { | |
1022 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
1023 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
1024 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
1025 | return dir; | |
1026 | switch (dir) { | |
1027 | default: | |
1028 | case XFRM_POLICY_IN: | |
1029 | return FLOW_DIR_IN; | |
1030 | case XFRM_POLICY_OUT: | |
1031 | return FLOW_DIR_OUT; | |
1032 | case XFRM_POLICY_FWD: | |
1033 | return FLOW_DIR_FWD; | |
3ff50b79 | 1034 | } |
df71837d TJ |
1035 | } |
1036 | ||
e0d1caa7 | 1037 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
1038 | { |
1039 | struct xfrm_policy *pol; | |
1040 | ||
1041 | read_lock_bh(&xfrm_policy_lock); | |
1042 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1043 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1044 | sk->sk_family); |
a716c119 | 1045 | int err = 0; |
df71837d | 1046 | |
3bccfbc7 | 1047 | if (match) { |
34f8d884 JHS |
1048 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1049 | pol = NULL; | |
1050 | goto out; | |
1051 | } | |
03e1ad7b PM |
1052 | err = security_xfrm_policy_lookup(pol->security, |
1053 | fl->secid, | |
1054 | policy_to_flow_dir(dir)); | |
3bccfbc7 VY |
1055 | if (!err) |
1056 | xfrm_pol_hold(pol); | |
1057 | else if (err == -ESRCH) | |
1058 | pol = NULL; | |
1059 | else | |
1060 | pol = ERR_PTR(err); | |
1061 | } else | |
1da177e4 LT |
1062 | pol = NULL; |
1063 | } | |
34f8d884 | 1064 | out: |
1da177e4 LT |
1065 | read_unlock_bh(&xfrm_policy_lock); |
1066 | return pol; | |
1067 | } | |
1068 | ||
1069 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1070 | { | |
98806f75 | 1071 | struct net *net = xp_net(pol); |
1121994c | 1072 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1073 | pol->family, dir); |
4e81bb83 | 1074 | |
98806f75 | 1075 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1076 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1077 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1078 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1079 | xfrm_pol_hold(pol); |
2518c7c2 | 1080 | |
98806f75 AD |
1081 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1082 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1083 | } |
1084 | ||
1085 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1086 | int dir) | |
1087 | { | |
98806f75 AD |
1088 | struct net *net = xp_net(pol); |
1089 | ||
2518c7c2 DM |
1090 | if (hlist_unhashed(&pol->bydst)) |
1091 | return NULL; | |
1da177e4 | 1092 | |
2518c7c2 DM |
1093 | hlist_del(&pol->bydst); |
1094 | hlist_del(&pol->byidx); | |
12a169e7 | 1095 | list_del(&pol->walk.all); |
98806f75 | 1096 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1097 | |
1098 | return pol; | |
1da177e4 LT |
1099 | } |
1100 | ||
4666faab | 1101 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1102 | { |
1103 | write_lock_bh(&xfrm_policy_lock); | |
1104 | pol = __xfrm_policy_unlink(pol, dir); | |
1105 | write_unlock_bh(&xfrm_policy_lock); | |
1106 | if (pol) { | |
1107 | if (dir < XFRM_POLICY_MAX) | |
1108 | atomic_inc(&flow_cache_genid); | |
1109 | xfrm_policy_kill(pol); | |
4666faab | 1110 | return 0; |
1da177e4 | 1111 | } |
4666faab | 1112 | return -ENOENT; |
1da177e4 | 1113 | } |
a70fcb0b | 1114 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1115 | |
1116 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1117 | { | |
1121994c | 1118 | struct net *net = xp_net(pol); |
1da177e4 LT |
1119 | struct xfrm_policy *old_pol; |
1120 | ||
4e81bb83 MN |
1121 | #ifdef CONFIG_XFRM_SUB_POLICY |
1122 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1123 | return -EINVAL; | |
1124 | #endif | |
1125 | ||
1da177e4 LT |
1126 | write_lock_bh(&xfrm_policy_lock); |
1127 | old_pol = sk->sk_policy[dir]; | |
1128 | sk->sk_policy[dir] = pol; | |
1129 | if (pol) { | |
9d729f72 | 1130 | pol->curlft.add_time = get_seconds(); |
1121994c | 1131 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1132 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1133 | } | |
1134 | if (old_pol) | |
1135 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); | |
1136 | write_unlock_bh(&xfrm_policy_lock); | |
1137 | ||
1138 | if (old_pol) { | |
1139 | xfrm_policy_kill(old_pol); | |
1140 | } | |
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1145 | { | |
0331b1f3 | 1146 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1147 | |
1148 | if (newp) { | |
1149 | newp->selector = old->selector; | |
03e1ad7b PM |
1150 | if (security_xfrm_policy_clone(old->security, |
1151 | &newp->security)) { | |
df71837d TJ |
1152 | kfree(newp); |
1153 | return NULL; /* ENOMEM */ | |
1154 | } | |
1da177e4 LT |
1155 | newp->lft = old->lft; |
1156 | newp->curlft = old->curlft; | |
fb977e2c | 1157 | newp->mark = old->mark; |
1da177e4 LT |
1158 | newp->action = old->action; |
1159 | newp->flags = old->flags; | |
1160 | newp->xfrm_nr = old->xfrm_nr; | |
1161 | newp->index = old->index; | |
4e81bb83 | 1162 | newp->type = old->type; |
1da177e4 LT |
1163 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1164 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1165 | write_lock_bh(&xfrm_policy_lock); | |
1166 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1167 | write_unlock_bh(&xfrm_policy_lock); | |
1168 | xfrm_pol_put(newp); | |
1169 | } | |
1170 | return newp; | |
1171 | } | |
1172 | ||
1173 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1174 | { | |
1175 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1176 | *p1 = sk->sk_policy[1]; | |
1177 | ||
1178 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1179 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1180 | return -ENOMEM; | |
1181 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1182 | return -ENOMEM; | |
1183 | return 0; | |
1184 | } | |
1185 | ||
a1e59abf | 1186 | static int |
fbda33b2 | 1187 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1188 | unsigned short family) |
1189 | { | |
1190 | int err; | |
1191 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1192 | ||
1193 | if (unlikely(afinfo == NULL)) | |
1194 | return -EINVAL; | |
fbda33b2 | 1195 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1196 | xfrm_policy_put_afinfo(afinfo); |
1197 | return err; | |
1198 | } | |
1199 | ||
1da177e4 LT |
1200 | /* Resolve list of templates for the flow, given policy. */ |
1201 | ||
1202 | static int | |
4e81bb83 MN |
1203 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1204 | struct xfrm_state **xfrm, | |
1205 | unsigned short family) | |
1da177e4 | 1206 | { |
fbda33b2 | 1207 | struct net *net = xp_net(policy); |
1da177e4 LT |
1208 | int nx; |
1209 | int i, error; | |
1210 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1211 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1212 | xfrm_address_t tmp; |
1da177e4 LT |
1213 | |
1214 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1215 | struct xfrm_state *x; | |
1216 | xfrm_address_t *remote = daddr; | |
1217 | xfrm_address_t *local = saddr; | |
1218 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1219 | ||
48b8d783 JK |
1220 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1221 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1222 | remote = &tmpl->id.daddr; |
1223 | local = &tmpl->saddr; | |
76b3f055 | 1224 | family = tmpl->encap_family; |
a1e59abf | 1225 | if (xfrm_addr_any(local, family)) { |
fbda33b2 | 1226 | error = xfrm_get_saddr(net, &tmp, remote, family); |
a1e59abf PM |
1227 | if (error) |
1228 | goto fail; | |
1229 | local = &tmp; | |
1230 | } | |
1da177e4 LT |
1231 | } |
1232 | ||
1233 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1234 | ||
1235 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1236 | xfrm[nx++] = x; | |
1237 | daddr = remote; | |
1238 | saddr = local; | |
1239 | continue; | |
1240 | } | |
1241 | if (x) { | |
1242 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1243 | -EINVAL : -EAGAIN); | |
1244 | xfrm_state_put(x); | |
1245 | } | |
a4322266 | 1246 | else if (error == -ESRCH) |
1247 | error = -EAGAIN; | |
1da177e4 LT |
1248 | |
1249 | if (!tmpl->optional) | |
1250 | goto fail; | |
1251 | } | |
1252 | return nx; | |
1253 | ||
1254 | fail: | |
1255 | for (nx--; nx>=0; nx--) | |
1256 | xfrm_state_put(xfrm[nx]); | |
1257 | return error; | |
1258 | } | |
1259 | ||
4e81bb83 MN |
1260 | static int |
1261 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1262 | struct xfrm_state **xfrm, | |
1263 | unsigned short family) | |
1264 | { | |
41a49cc3 MN |
1265 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1266 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1267 | int cnx = 0; |
1268 | int error; | |
1269 | int ret; | |
1270 | int i; | |
1271 | ||
1272 | for (i = 0; i < npols; i++) { | |
1273 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1274 | error = -ENOBUFS; | |
1275 | goto fail; | |
1276 | } | |
41a49cc3 MN |
1277 | |
1278 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1279 | if (ret < 0) { |
1280 | error = ret; | |
1281 | goto fail; | |
1282 | } else | |
1283 | cnx += ret; | |
1284 | } | |
1285 | ||
41a49cc3 MN |
1286 | /* found states are sorted for outbound processing */ |
1287 | if (npols > 1) | |
1288 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1289 | ||
4e81bb83 MN |
1290 | return cnx; |
1291 | ||
1292 | fail: | |
1293 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1294 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1295 | return error; |
1296 | ||
1297 | } | |
1298 | ||
1da177e4 LT |
1299 | /* Check that the bundle accepts the flow and its components are |
1300 | * still valid. | |
1301 | */ | |
1302 | ||
1303 | static struct dst_entry * | |
1304 | xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family) | |
1305 | { | |
1306 | struct dst_entry *x; | |
1307 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1308 | if (unlikely(afinfo == NULL)) | |
1309 | return ERR_PTR(-EINVAL); | |
1310 | x = afinfo->find_bundle(fl, policy); | |
1311 | xfrm_policy_put_afinfo(afinfo); | |
1312 | return x; | |
1313 | } | |
1314 | ||
25ee3286 HX |
1315 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1316 | { | |
1317 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1318 | int tos; | |
1da177e4 | 1319 | |
25ee3286 HX |
1320 | if (!afinfo) |
1321 | return -EINVAL; | |
1322 | ||
1323 | tos = afinfo->get_tos(fl); | |
1324 | ||
1325 | xfrm_policy_put_afinfo(afinfo); | |
1326 | ||
1327 | return tos; | |
1328 | } | |
1329 | ||
d7c7544c | 1330 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1331 | { |
1da177e4 | 1332 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1333 | struct dst_ops *dst_ops; |
25ee3286 HX |
1334 | struct xfrm_dst *xdst; |
1335 | ||
1336 | if (!afinfo) | |
1337 | return ERR_PTR(-EINVAL); | |
1338 | ||
d7c7544c AD |
1339 | switch (family) { |
1340 | case AF_INET: | |
1341 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1342 | break; | |
1343 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1344 | case AF_INET6: | |
1345 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1346 | break; | |
1347 | #endif | |
1348 | default: | |
1349 | BUG(); | |
1350 | } | |
1351 | xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS); | |
25ee3286 HX |
1352 | |
1353 | xfrm_policy_put_afinfo(afinfo); | |
1354 | ||
1355 | return xdst; | |
1356 | } | |
1357 | ||
a1b05140 MN |
1358 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1359 | int nfheader_len) | |
1360 | { | |
1361 | struct xfrm_policy_afinfo *afinfo = | |
1362 | xfrm_policy_get_afinfo(dst->ops->family); | |
1363 | int err; | |
1364 | ||
1365 | if (!afinfo) | |
1366 | return -EINVAL; | |
1367 | ||
1368 | err = afinfo->init_path(path, dst, nfheader_len); | |
1369 | ||
1370 | xfrm_policy_put_afinfo(afinfo); | |
1371 | ||
1372 | return err; | |
1373 | } | |
1374 | ||
87c1e12b HX |
1375 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
1376 | struct flowi *fl) | |
25ee3286 HX |
1377 | { |
1378 | struct xfrm_policy_afinfo *afinfo = | |
1379 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1380 | int err; | |
1381 | ||
1382 | if (!afinfo) | |
1da177e4 | 1383 | return -EINVAL; |
25ee3286 | 1384 | |
87c1e12b | 1385 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1386 | |
1da177e4 | 1387 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1388 | |
1da177e4 LT |
1389 | return err; |
1390 | } | |
1391 | ||
25ee3286 HX |
1392 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1393 | * all the metrics... Shortly, bundle a bundle. | |
1394 | */ | |
1395 | ||
1396 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1397 | struct xfrm_state **xfrm, int nx, | |
1398 | struct flowi *fl, | |
1399 | struct dst_entry *dst) | |
1400 | { | |
d7c7544c | 1401 | struct net *net = xp_net(policy); |
25ee3286 HX |
1402 | unsigned long now = jiffies; |
1403 | struct net_device *dev; | |
1404 | struct dst_entry *dst_prev = NULL; | |
1405 | struct dst_entry *dst0 = NULL; | |
1406 | int i = 0; | |
1407 | int err; | |
1408 | int header_len = 0; | |
a1b05140 | 1409 | int nfheader_len = 0; |
25ee3286 HX |
1410 | int trailer_len = 0; |
1411 | int tos; | |
1412 | int family = policy->selector.family; | |
9bb182a7 YH |
1413 | xfrm_address_t saddr, daddr; |
1414 | ||
1415 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1416 | |
1417 | tos = xfrm_get_tos(fl, family); | |
1418 | err = tos; | |
1419 | if (tos < 0) | |
1420 | goto put_states; | |
1421 | ||
1422 | dst_hold(dst); | |
1423 | ||
1424 | for (; i < nx; i++) { | |
d7c7544c | 1425 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1426 | struct dst_entry *dst1 = &xdst->u.dst; |
1427 | ||
1428 | err = PTR_ERR(xdst); | |
1429 | if (IS_ERR(xdst)) { | |
1430 | dst_release(dst); | |
1431 | goto put_states; | |
1432 | } | |
1433 | ||
1434 | if (!dst_prev) | |
1435 | dst0 = dst1; | |
1436 | else { | |
1437 | dst_prev->child = dst_clone(dst1); | |
1438 | dst1->flags |= DST_NOHASH; | |
1439 | } | |
1440 | ||
1441 | xdst->route = dst; | |
1442 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1443 | ||
1444 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1445 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1446 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1447 | family); | |
25ee3286 HX |
1448 | err = PTR_ERR(dst); |
1449 | if (IS_ERR(dst)) | |
1450 | goto put_states; | |
1451 | } else | |
1452 | dst_hold(dst); | |
1453 | ||
1454 | dst1->xfrm = xfrm[i]; | |
1455 | xdst->genid = xfrm[i]->genid; | |
1456 | ||
1457 | dst1->obsolete = -1; | |
1458 | dst1->flags |= DST_HOST; | |
1459 | dst1->lastuse = now; | |
1460 | ||
1461 | dst1->input = dst_discard; | |
1462 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1463 | ||
1464 | dst1->next = dst_prev; | |
1465 | dst_prev = dst1; | |
1466 | ||
1467 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1468 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1469 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1470 | trailer_len += xfrm[i]->props.trailer_len; |
1471 | } | |
1472 | ||
1473 | dst_prev->child = dst; | |
1474 | dst0->path = dst; | |
1475 | ||
1476 | err = -ENODEV; | |
1477 | dev = dst->dev; | |
1478 | if (!dev) | |
1479 | goto free_dst; | |
1480 | ||
96c53401 | 1481 | /* Copy neighbour for reachability confirmation */ |
25ee3286 HX |
1482 | dst0->neighbour = neigh_clone(dst->neighbour); |
1483 | ||
a1b05140 | 1484 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1485 | xfrm_init_pmtu(dst_prev); |
1486 | ||
1487 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1488 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1489 | ||
87c1e12b | 1490 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1491 | if (err) |
1492 | goto free_dst; | |
1493 | ||
1494 | dst_prev->header_len = header_len; | |
1495 | dst_prev->trailer_len = trailer_len; | |
1496 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1497 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1498 | } | |
1499 | ||
1500 | out: | |
1501 | return dst0; | |
1502 | ||
1503 | put_states: | |
1504 | for (; i < nx; i++) | |
1505 | xfrm_state_put(xfrm[i]); | |
1506 | free_dst: | |
1507 | if (dst0) | |
1508 | dst_free(dst0); | |
1509 | dst0 = ERR_PTR(err); | |
1510 | goto out; | |
1511 | } | |
1512 | ||
157bfc25 MN |
1513 | static int inline |
1514 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1515 | { | |
1516 | if (!*target) { | |
1517 | *target = kmalloc(size, GFP_ATOMIC); | |
1518 | if (!*target) | |
1519 | return -ENOMEM; | |
1520 | } | |
1521 | memcpy(*target, src, size); | |
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | static int inline | |
1526 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1527 | { | |
1528 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1529 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1530 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1531 | sel, sizeof(*sel)); | |
1532 | #else | |
1533 | return 0; | |
1534 | #endif | |
1535 | } | |
1536 | ||
1537 | static int inline | |
1538 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1539 | { | |
1540 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1541 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1542 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1543 | #else | |
1544 | return 0; | |
1545 | #endif | |
1546 | } | |
1da177e4 LT |
1547 | |
1548 | static int stale_bundle(struct dst_entry *dst); | |
1549 | ||
1550 | /* Main function: finds/creates a bundle for given flow. | |
1551 | * | |
1552 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1553 | * on interfaces with disabled IPsec. | |
1554 | */ | |
52479b62 | 1555 | int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 | 1556 | struct sock *sk, int flags) |
1da177e4 LT |
1557 | { |
1558 | struct xfrm_policy *policy; | |
4e81bb83 MN |
1559 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1560 | int npols; | |
1561 | int pol_dead; | |
1562 | int xfrm_nr; | |
1563 | int pi; | |
1da177e4 LT |
1564 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; |
1565 | struct dst_entry *dst, *dst_orig = *dst_p; | |
1566 | int nx = 0; | |
1567 | int err; | |
1568 | u32 genid; | |
42cf93cd | 1569 | u16 family; |
df71837d | 1570 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
e0d1caa7 | 1571 | |
1da177e4 LT |
1572 | restart: |
1573 | genid = atomic_read(&flow_cache_genid); | |
1574 | policy = NULL; | |
4e81bb83 MN |
1575 | for (pi = 0; pi < ARRAY_SIZE(pols); pi++) |
1576 | pols[pi] = NULL; | |
1577 | npols = 0; | |
1578 | pol_dead = 0; | |
1579 | xfrm_nr = 0; | |
1580 | ||
f7944fb1 | 1581 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
e0d1caa7 | 1582 | policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); |
75b8c133 | 1583 | err = PTR_ERR(policy); |
0aa64774 | 1584 | if (IS_ERR(policy)) { |
59c9940e | 1585 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
75b8c133 | 1586 | goto dropdst; |
0aa64774 | 1587 | } |
3bccfbc7 | 1588 | } |
1da177e4 LT |
1589 | |
1590 | if (!policy) { | |
1591 | /* To accelerate a bit... */ | |
2518c7c2 | 1592 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 1593 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 1594 | goto nopol; |
1da177e4 | 1595 | |
52479b62 | 1596 | policy = flow_cache_lookup(net, fl, dst_orig->ops->family, |
42cf93cd | 1597 | dir, xfrm_policy_lookup); |
75b8c133 | 1598 | err = PTR_ERR(policy); |
d66e37a9 | 1599 | if (IS_ERR(policy)) { |
59c9940e | 1600 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
75b8c133 | 1601 | goto dropdst; |
d66e37a9 | 1602 | } |
1da177e4 LT |
1603 | } |
1604 | ||
1605 | if (!policy) | |
8b7817f3 | 1606 | goto nopol; |
1da177e4 | 1607 | |
42cf93cd | 1608 | family = dst_orig->ops->family; |
4e81bb83 MN |
1609 | pols[0] = policy; |
1610 | npols ++; | |
1611 | xfrm_nr += pols[0]->xfrm_nr; | |
1da177e4 | 1612 | |
aef21785 | 1613 | err = -ENOENT; |
8b7817f3 HX |
1614 | if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) |
1615 | goto error; | |
1616 | ||
1617 | policy->curlft.use_time = get_seconds(); | |
1618 | ||
1da177e4 | 1619 | switch (policy->action) { |
5e5234ff | 1620 | default: |
1da177e4 LT |
1621 | case XFRM_POLICY_BLOCK: |
1622 | /* Prohibit the flow */ | |
59c9940e | 1623 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1624 | err = -EPERM; |
1625 | goto error; | |
1da177e4 LT |
1626 | |
1627 | case XFRM_POLICY_ALLOW: | |
4e81bb83 | 1628 | #ifndef CONFIG_XFRM_SUB_POLICY |
1da177e4 LT |
1629 | if (policy->xfrm_nr == 0) { |
1630 | /* Flow passes not transformed. */ | |
1631 | xfrm_pol_put(policy); | |
1632 | return 0; | |
1633 | } | |
4e81bb83 | 1634 | #endif |
1da177e4 LT |
1635 | |
1636 | /* Try to find matching bundle. | |
1637 | * | |
1638 | * LATER: help from flow cache. It is optional, this | |
1639 | * is required only for output policy. | |
1640 | */ | |
1641 | dst = xfrm_find_bundle(fl, policy, family); | |
1642 | if (IS_ERR(dst)) { | |
59c9940e | 1643 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
e104411b PM |
1644 | err = PTR_ERR(dst); |
1645 | goto error; | |
1da177e4 LT |
1646 | } |
1647 | ||
1648 | if (dst) | |
1649 | break; | |
1650 | ||
4e81bb83 MN |
1651 | #ifdef CONFIG_XFRM_SUB_POLICY |
1652 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
52479b62 AD |
1653 | pols[1] = xfrm_policy_lookup_bytype(net, |
1654 | XFRM_POLICY_TYPE_MAIN, | |
4e81bb83 MN |
1655 | fl, family, |
1656 | XFRM_POLICY_OUT); | |
1657 | if (pols[1]) { | |
134b0fc5 | 1658 | if (IS_ERR(pols[1])) { |
59c9940e | 1659 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
134b0fc5 JM |
1660 | err = PTR_ERR(pols[1]); |
1661 | goto error; | |
1662 | } | |
4e81bb83 | 1663 | if (pols[1]->action == XFRM_POLICY_BLOCK) { |
59c9940e | 1664 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
4e81bb83 MN |
1665 | err = -EPERM; |
1666 | goto error; | |
1667 | } | |
1668 | npols ++; | |
1669 | xfrm_nr += pols[1]->xfrm_nr; | |
1670 | } | |
1671 | } | |
1672 | ||
1673 | /* | |
1674 | * Because neither flowi nor bundle information knows about | |
1675 | * transformation template size. On more than one policy usage | |
1676 | * we can realize whether all of them is bypass or not after | |
1677 | * they are searched. See above not-transformed bypass | |
1678 | * is surrounded by non-sub policy configuration, too. | |
1679 | */ | |
1680 | if (xfrm_nr == 0) { | |
1681 | /* Flow passes not transformed. */ | |
1682 | xfrm_pols_put(pols, npols); | |
1683 | return 0; | |
1684 | } | |
1685 | ||
1686 | #endif | |
1687 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); | |
1da177e4 LT |
1688 | |
1689 | if (unlikely(nx<0)) { | |
1690 | err = nx; | |
b27aeadb | 1691 | if (err == -EAGAIN && net->xfrm.sysctl_larval_drop) { |
14e50e57 DM |
1692 | /* EREMOTE tells the caller to generate |
1693 | * a one-shot blackhole route. | |
1694 | */ | |
59c9940e | 1695 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
14e50e57 DM |
1696 | xfrm_pol_put(policy); |
1697 | return -EREMOTE; | |
1698 | } | |
815f4e57 | 1699 | if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) { |
1da177e4 LT |
1700 | DECLARE_WAITQUEUE(wait, current); |
1701 | ||
52479b62 | 1702 | add_wait_queue(&net->xfrm.km_waitq, &wait); |
1da177e4 LT |
1703 | set_current_state(TASK_INTERRUPTIBLE); |
1704 | schedule(); | |
1705 | set_current_state(TASK_RUNNING); | |
52479b62 | 1706 | remove_wait_queue(&net->xfrm.km_waitq, &wait); |
1da177e4 | 1707 | |
4e81bb83 | 1708 | nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family); |
1da177e4 LT |
1709 | |
1710 | if (nx == -EAGAIN && signal_pending(current)) { | |
59c9940e | 1711 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 LT |
1712 | err = -ERESTART; |
1713 | goto error; | |
1714 | } | |
1715 | if (nx == -EAGAIN || | |
1716 | genid != atomic_read(&flow_cache_genid)) { | |
4e81bb83 | 1717 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1718 | goto restart; |
1719 | } | |
1720 | err = nx; | |
1721 | } | |
0aa64774 | 1722 | if (err < 0) { |
59c9940e | 1723 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
1da177e4 | 1724 | goto error; |
0aa64774 | 1725 | } |
1da177e4 LT |
1726 | } |
1727 | if (nx == 0) { | |
1728 | /* Flow passes not transformed. */ | |
4e81bb83 | 1729 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1730 | return 0; |
1731 | } | |
1732 | ||
25ee3286 HX |
1733 | dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig); |
1734 | err = PTR_ERR(dst); | |
0aa64774 | 1735 | if (IS_ERR(dst)) { |
59c9940e | 1736 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); |
1da177e4 | 1737 | goto error; |
0aa64774 | 1738 | } |
1da177e4 | 1739 | |
4e81bb83 MN |
1740 | for (pi = 0; pi < npols; pi++) { |
1741 | read_lock_bh(&pols[pi]->lock); | |
12a169e7 | 1742 | pol_dead |= pols[pi]->walk.dead; |
4e81bb83 MN |
1743 | read_unlock_bh(&pols[pi]->lock); |
1744 | } | |
1745 | ||
1da177e4 | 1746 | write_lock_bh(&policy->lock); |
4e81bb83 | 1747 | if (unlikely(pol_dead || stale_bundle(dst))) { |
1da177e4 LT |
1748 | /* Wow! While we worked on resolving, this |
1749 | * policy has gone. Retry. It is not paranoia, | |
1750 | * we just cannot enlist new bundle to dead object. | |
1751 | * We can't enlist stable bundles either. | |
1752 | */ | |
1753 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1754 | dst_free(dst); |
00de651d | 1755 | |
0aa64774 | 1756 | if (pol_dead) |
59c9940e | 1757 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLDEAD); |
0aa64774 | 1758 | else |
59c9940e | 1759 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
00de651d HX |
1760 | err = -EHOSTUNREACH; |
1761 | goto error; | |
1da177e4 | 1762 | } |
157bfc25 MN |
1763 | |
1764 | if (npols > 1) | |
1765 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1766 | else | |
1767 | err = xfrm_dst_update_origin(dst, fl); | |
1768 | if (unlikely(err)) { | |
1769 | write_unlock_bh(&policy->lock); | |
9d7d7402 | 1770 | dst_free(dst); |
59c9940e | 1771 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); |
157bfc25 MN |
1772 | goto error; |
1773 | } | |
1774 | ||
1da177e4 LT |
1775 | dst->next = policy->bundles; |
1776 | policy->bundles = dst; | |
1777 | dst_hold(dst); | |
1778 | write_unlock_bh(&policy->lock); | |
1779 | } | |
1780 | *dst_p = dst; | |
1781 | dst_release(dst_orig); | |
a716c119 | 1782 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
1783 | return 0; |
1784 | ||
1785 | error: | |
4e81bb83 | 1786 | xfrm_pols_put(pols, npols); |
75b8c133 HX |
1787 | dropdst: |
1788 | dst_release(dst_orig); | |
1da177e4 LT |
1789 | *dst_p = NULL; |
1790 | return err; | |
8b7817f3 HX |
1791 | |
1792 | nopol: | |
aef21785 | 1793 | err = -ENOENT; |
8b7817f3 HX |
1794 | if (flags & XFRM_LOOKUP_ICMP) |
1795 | goto dropdst; | |
1796 | return 0; | |
1da177e4 | 1797 | } |
14e50e57 DM |
1798 | EXPORT_SYMBOL(__xfrm_lookup); |
1799 | ||
52479b62 | 1800 | int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 DM |
1801 | struct sock *sk, int flags) |
1802 | { | |
52479b62 | 1803 | int err = __xfrm_lookup(net, dst_p, fl, sk, flags); |
14e50e57 DM |
1804 | |
1805 | if (err == -EREMOTE) { | |
1806 | dst_release(*dst_p); | |
1807 | *dst_p = NULL; | |
1808 | err = -EAGAIN; | |
1809 | } | |
1810 | ||
1811 | return err; | |
1812 | } | |
1da177e4 LT |
1813 | EXPORT_SYMBOL(xfrm_lookup); |
1814 | ||
df0ba92a MN |
1815 | static inline int |
1816 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1817 | { | |
1818 | struct xfrm_state *x; | |
df0ba92a MN |
1819 | |
1820 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1821 | return 0; | |
1822 | x = skb->sp->xvec[idx]; | |
1823 | if (!x->type->reject) | |
1824 | return 0; | |
1ecafede | 1825 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1826 | } |
1827 | ||
1da177e4 LT |
1828 | /* When skb is transformed back to its "native" form, we have to |
1829 | * check policy restrictions. At the moment we make this in maximally | |
1830 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1831 | * have policy cached at them. | |
1832 | */ | |
1833 | ||
1834 | static inline int | |
a716c119 | 1835 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1836 | unsigned short family) |
1837 | { | |
1838 | if (xfrm_state_kern(x)) | |
928ba416 | 1839 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1840 | return x->id.proto == tmpl->id.proto && |
1841 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1842 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1843 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1844 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1845 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1846 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1847 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1848 | } |
1849 | ||
df0ba92a MN |
1850 | /* |
1851 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1852 | * because of optional transport mode, or next index of the mathced secpath | |
1853 | * state with the template. | |
1854 | * -1 is returned when no matching template is found. | |
1855 | * Otherwise "-2 - errored_index" is returned. | |
1856 | */ | |
1da177e4 LT |
1857 | static inline int |
1858 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1859 | unsigned short family) | |
1860 | { | |
1861 | int idx = start; | |
1862 | ||
1863 | if (tmpl->optional) { | |
7e49e6de | 1864 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1865 | return start; |
1866 | } else | |
1867 | start = -1; | |
1868 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1869 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1870 | return ++idx; |
df0ba92a MN |
1871 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1872 | if (start == -1) | |
1873 | start = -2-idx; | |
1da177e4 | 1874 | break; |
df0ba92a | 1875 | } |
1da177e4 LT |
1876 | } |
1877 | return start; | |
1878 | } | |
1879 | ||
d5422efe HX |
1880 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1881 | unsigned int family, int reverse) | |
1da177e4 LT |
1882 | { |
1883 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1884 | int err; |
1da177e4 LT |
1885 | |
1886 | if (unlikely(afinfo == NULL)) | |
1887 | return -EAFNOSUPPORT; | |
1888 | ||
d5422efe | 1889 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1890 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1891 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1892 | return err; |
1da177e4 | 1893 | } |
d5422efe | 1894 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1895 | |
df0ba92a | 1896 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1897 | { |
1898 | for (; k < sp->len; k++) { | |
df0ba92a | 1899 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1900 | *idxp = k; |
1da177e4 | 1901 | return 1; |
df0ba92a | 1902 | } |
1da177e4 LT |
1903 | } |
1904 | ||
1905 | return 0; | |
1906 | } | |
1907 | ||
a716c119 | 1908 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1909 | unsigned short family) |
1910 | { | |
f6e1e25d | 1911 | struct net *net = dev_net(skb->dev); |
1da177e4 | 1912 | struct xfrm_policy *pol; |
4e81bb83 MN |
1913 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
1914 | int npols = 0; | |
1915 | int xfrm_nr; | |
1916 | int pi; | |
d5422efe | 1917 | int reverse; |
1da177e4 | 1918 | struct flowi fl; |
d5422efe | 1919 | u8 fl_dir; |
df0ba92a | 1920 | int xerr_idx = -1; |
1da177e4 | 1921 | |
d5422efe HX |
1922 | reverse = dir & ~XFRM_POLICY_MASK; |
1923 | dir &= XFRM_POLICY_MASK; | |
1924 | fl_dir = policy_to_flow_dir(dir); | |
1925 | ||
0aa64774 | 1926 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 1927 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 1928 | return 0; |
0aa64774 MN |
1929 | } |
1930 | ||
eb9c7ebe | 1931 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
1932 | |
1933 | /* First, check used SA against their selectors. */ | |
1934 | if (skb->sp) { | |
1935 | int i; | |
1936 | ||
1937 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 1938 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 1939 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 1940 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 1941 | return 0; |
0aa64774 | 1942 | } |
1da177e4 LT |
1943 | } |
1944 | } | |
1945 | ||
1946 | pol = NULL; | |
3bccfbc7 | 1947 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 1948 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 1949 | if (IS_ERR(pol)) { |
59c9940e | 1950 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 1951 | return 0; |
0aa64774 | 1952 | } |
3bccfbc7 | 1953 | } |
1da177e4 LT |
1954 | |
1955 | if (!pol) | |
f6e1e25d | 1956 | pol = flow_cache_lookup(net, &fl, family, fl_dir, |
1da177e4 LT |
1957 | xfrm_policy_lookup); |
1958 | ||
0aa64774 | 1959 | if (IS_ERR(pol)) { |
59c9940e | 1960 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 1961 | return 0; |
0aa64774 | 1962 | } |
134b0fc5 | 1963 | |
df0ba92a | 1964 | if (!pol) { |
d1d9facf | 1965 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 1966 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 1967 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
1968 | return 0; |
1969 | } | |
1970 | return 1; | |
1971 | } | |
1da177e4 | 1972 | |
9d729f72 | 1973 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 1974 | |
4e81bb83 MN |
1975 | pols[0] = pol; |
1976 | npols ++; | |
1977 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1978 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 1979 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
1980 | &fl, family, |
1981 | XFRM_POLICY_IN); | |
1982 | if (pols[1]) { | |
0aa64774 | 1983 | if (IS_ERR(pols[1])) { |
59c9940e | 1984 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 1985 | return 0; |
0aa64774 | 1986 | } |
9d729f72 | 1987 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
1988 | npols ++; |
1989 | } | |
1990 | } | |
1991 | #endif | |
1992 | ||
1da177e4 LT |
1993 | if (pol->action == XFRM_POLICY_ALLOW) { |
1994 | struct sec_path *sp; | |
1995 | static struct sec_path dummy; | |
4e81bb83 | 1996 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 1997 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
1998 | struct xfrm_tmpl **tpp = tp; |
1999 | int ti = 0; | |
1da177e4 LT |
2000 | int i, k; |
2001 | ||
2002 | if ((sp = skb->sp) == NULL) | |
2003 | sp = &dummy; | |
2004 | ||
4e81bb83 MN |
2005 | for (pi = 0; pi < npols; pi++) { |
2006 | if (pols[pi] != pol && | |
0aa64774 | 2007 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2008 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2009 | goto reject; |
0aa64774 MN |
2010 | } |
2011 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2012 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2013 | goto reject_error; |
0aa64774 | 2014 | } |
4e81bb83 MN |
2015 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2016 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2017 | } | |
2018 | xfrm_nr = ti; | |
41a49cc3 MN |
2019 | if (npols > 1) { |
2020 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2021 | tpp = stp; | |
2022 | } | |
4e81bb83 | 2023 | |
1da177e4 LT |
2024 | /* For each tunnel xfrm, find the first matching tmpl. |
2025 | * For each tmpl before that, find corresponding xfrm. | |
2026 | * Order is _important_. Later we will implement | |
2027 | * some barriers, but at the moment barriers | |
2028 | * are implied between each two transformations. | |
2029 | */ | |
4e81bb83 MN |
2030 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2031 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2032 | if (k < 0) { |
d1d9facf JM |
2033 | if (k < -1) |
2034 | /* "-2 - errored_index" returned */ | |
2035 | xerr_idx = -(2+k); | |
59c9940e | 2036 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2037 | goto reject; |
df0ba92a | 2038 | } |
1da177e4 LT |
2039 | } |
2040 | ||
0aa64774 | 2041 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2042 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2043 | goto reject; |
0aa64774 | 2044 | } |
1da177e4 | 2045 | |
4e81bb83 | 2046 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2047 | return 1; |
2048 | } | |
59c9940e | 2049 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2050 | |
2051 | reject: | |
df0ba92a | 2052 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2053 | reject_error: |
2054 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2055 | return 0; |
2056 | } | |
2057 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2058 | ||
2059 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2060 | { | |
99a66657 | 2061 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2062 | struct flowi fl; |
adf30907 ED |
2063 | struct dst_entry *dst; |
2064 | int res; | |
1da177e4 | 2065 | |
0aa64774 | 2066 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2067 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2068 | return 0; |
0aa64774 | 2069 | } |
1da177e4 | 2070 | |
adf30907 ED |
2071 | dst = skb_dst(skb); |
2072 | ||
2073 | res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0; | |
2074 | skb_dst_set(skb, dst); | |
2075 | return res; | |
1da177e4 LT |
2076 | } |
2077 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2078 | ||
d49c73c7 DM |
2079 | /* Optimize later using cookies and generation ids. */ |
2080 | ||
1da177e4 LT |
2081 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2082 | { | |
d49c73c7 DM |
2083 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2084 | * to "-1" to force all XFRM destinations to get validated by | |
2085 | * dst_ops->check on every use. We do this because when a | |
2086 | * normal route referenced by an XFRM dst is obsoleted we do | |
2087 | * not go looking around for all parent referencing XFRM dsts | |
2088 | * so that we can invalidate them. It is just too much work. | |
2089 | * Instead we make the checks here on every use. For example: | |
2090 | * | |
2091 | * XFRM dst A --> IPv4 dst X | |
2092 | * | |
2093 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2094 | * in this example). If X is marked obsolete, "A" will not | |
2095 | * notice. That's what we are validating here via the | |
2096 | * stale_bundle() check. | |
2097 | * | |
2098 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2099 | * dst which causes it's ->obsolete field to be set to a | |
2100 | * positive non-zero integer. If an XFRM dst has been pruned | |
2101 | * like this, we want to force a new route lookup. | |
399c180a | 2102 | */ |
d49c73c7 DM |
2103 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2104 | return dst; | |
2105 | ||
1da177e4 LT |
2106 | return NULL; |
2107 | } | |
2108 | ||
2109 | static int stale_bundle(struct dst_entry *dst) | |
2110 | { | |
5b368e61 | 2111 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2112 | } |
2113 | ||
aabc9761 | 2114 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2115 | { |
1da177e4 | 2116 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2117 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2118 | dev_hold(dst->dev); |
1da177e4 LT |
2119 | dev_put(dev); |
2120 | } | |
2121 | } | |
aabc9761 | 2122 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2123 | |
2124 | static void xfrm_link_failure(struct sk_buff *skb) | |
2125 | { | |
2126 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
2127 | return; | |
2128 | } | |
2129 | ||
2130 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2131 | { | |
2132 | if (dst) { | |
2133 | if (dst->obsolete) { | |
2134 | dst_release(dst); | |
2135 | dst = NULL; | |
2136 | } | |
2137 | } | |
2138 | return dst; | |
2139 | } | |
2140 | ||
2518c7c2 DM |
2141 | static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p) |
2142 | { | |
2143 | struct dst_entry *dst, **dstp; | |
2144 | ||
2145 | write_lock(&pol->lock); | |
2146 | dstp = &pol->bundles; | |
2147 | while ((dst=*dstp) != NULL) { | |
2148 | if (func(dst)) { | |
2149 | *dstp = dst->next; | |
2150 | dst->next = *gc_list_p; | |
2151 | *gc_list_p = dst; | |
2152 | } else { | |
2153 | dstp = &dst->next; | |
2154 | } | |
2155 | } | |
2156 | write_unlock(&pol->lock); | |
2157 | } | |
2158 | ||
3dd0b499 | 2159 | static void xfrm_prune_bundles(struct net *net, int (*func)(struct dst_entry *)) |
1da177e4 | 2160 | { |
2518c7c2 DM |
2161 | struct dst_entry *gc_list = NULL; |
2162 | int dir; | |
1da177e4 LT |
2163 | |
2164 | read_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
2165 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
2166 | struct xfrm_policy *pol; | |
2167 | struct hlist_node *entry; | |
2168 | struct hlist_head *table; | |
2169 | int i; | |
4e81bb83 | 2170 | |
2518c7c2 | 2171 | hlist_for_each_entry(pol, entry, |
3dd0b499 | 2172 | &net->xfrm.policy_inexact[dir], bydst) |
2518c7c2 DM |
2173 | prune_one_bundle(pol, func, &gc_list); |
2174 | ||
3dd0b499 AD |
2175 | table = net->xfrm.policy_bydst[dir].table; |
2176 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { | |
2518c7c2 DM |
2177 | hlist_for_each_entry(pol, entry, table + i, bydst) |
2178 | prune_one_bundle(pol, func, &gc_list); | |
1da177e4 LT |
2179 | } |
2180 | } | |
2181 | read_unlock_bh(&xfrm_policy_lock); | |
2182 | ||
2183 | while (gc_list) { | |
2518c7c2 | 2184 | struct dst_entry *dst = gc_list; |
1da177e4 LT |
2185 | gc_list = dst->next; |
2186 | dst_free(dst); | |
2187 | } | |
2188 | } | |
2189 | ||
2190 | static int unused_bundle(struct dst_entry *dst) | |
2191 | { | |
2192 | return !atomic_read(&dst->__refcnt); | |
2193 | } | |
2194 | ||
ddcfd796 | 2195 | static void __xfrm_garbage_collect(struct net *net) |
1da177e4 | 2196 | { |
ddcfd796 | 2197 | xfrm_prune_bundles(net, unused_bundle); |
1da177e4 LT |
2198 | } |
2199 | ||
3dd0b499 | 2200 | static int xfrm_flush_bundles(struct net *net) |
1da177e4 | 2201 | { |
3dd0b499 | 2202 | xfrm_prune_bundles(net, stale_bundle); |
1da177e4 LT |
2203 | return 0; |
2204 | } | |
2205 | ||
25ee3286 | 2206 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2207 | { |
2208 | do { | |
2209 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2210 | u32 pmtu, route_mtu_cached; | |
2211 | ||
2212 | pmtu = dst_mtu(dst->child); | |
2213 | xdst->child_mtu_cached = pmtu; | |
2214 | ||
2215 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2216 | ||
2217 | route_mtu_cached = dst_mtu(xdst->route); | |
2218 | xdst->route_mtu_cached = route_mtu_cached; | |
2219 | ||
2220 | if (pmtu > route_mtu_cached) | |
2221 | pmtu = route_mtu_cached; | |
2222 | ||
2223 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2224 | } while ((dst = dst->next)); | |
2225 | } | |
2226 | ||
1da177e4 LT |
2227 | /* Check that the bundle accepts the flow and its components are |
2228 | * still valid. | |
2229 | */ | |
2230 | ||
5b368e61 VY |
2231 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2232 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2233 | { |
2234 | struct dst_entry *dst = &first->u.dst; | |
2235 | struct xfrm_dst *last; | |
2236 | u32 mtu; | |
2237 | ||
92d63dec | 2238 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2239 | (dst->dev && !netif_running(dst->dev))) |
2240 | return 0; | |
157bfc25 MN |
2241 | #ifdef CONFIG_XFRM_SUB_POLICY |
2242 | if (fl) { | |
2243 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2244 | return 0; | |
2245 | if (first->partner && | |
2246 | !xfrm_selector_match(first->partner, fl, family)) | |
2247 | return 0; | |
2248 | } | |
2249 | #endif | |
1da177e4 LT |
2250 | |
2251 | last = NULL; | |
2252 | ||
2253 | do { | |
2254 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2255 | ||
2256 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2257 | return 0; | |
67f83cbf VY |
2258 | if (fl && pol && |
2259 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2260 | return 0; |
1da177e4 LT |
2261 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2262 | return 0; | |
9d4a706d DM |
2263 | if (xdst->genid != dst->xfrm->genid) |
2264 | return 0; | |
e53820de | 2265 | |
1bfcb10f | 2266 | if (strict && fl && |
13996378 | 2267 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2268 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2269 | return 0; | |
1da177e4 LT |
2270 | |
2271 | mtu = dst_mtu(dst->child); | |
2272 | if (xdst->child_mtu_cached != mtu) { | |
2273 | last = xdst; | |
2274 | xdst->child_mtu_cached = mtu; | |
2275 | } | |
2276 | ||
92d63dec | 2277 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2278 | return 0; |
2279 | mtu = dst_mtu(xdst->route); | |
2280 | if (xdst->route_mtu_cached != mtu) { | |
2281 | last = xdst; | |
2282 | xdst->route_mtu_cached = mtu; | |
2283 | } | |
2284 | ||
2285 | dst = dst->child; | |
2286 | } while (dst->xfrm); | |
2287 | ||
2288 | if (likely(!last)) | |
2289 | return 1; | |
2290 | ||
2291 | mtu = last->child_mtu_cached; | |
2292 | for (;;) { | |
2293 | dst = &last->u.dst; | |
2294 | ||
2295 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2296 | if (mtu > last->route_mtu_cached) | |
2297 | mtu = last->route_mtu_cached; | |
2298 | dst->metrics[RTAX_MTU-1] = mtu; | |
2299 | ||
2300 | if (last == first) | |
2301 | break; | |
2302 | ||
bd0bf076 | 2303 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2304 | last->child_mtu_cached = mtu; |
2305 | } | |
2306 | ||
2307 | return 1; | |
2308 | } | |
2309 | ||
2310 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2311 | ||
1da177e4 LT |
2312 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2313 | { | |
d7c7544c | 2314 | struct net *net; |
1da177e4 LT |
2315 | int err = 0; |
2316 | if (unlikely(afinfo == NULL)) | |
2317 | return -EINVAL; | |
2318 | if (unlikely(afinfo->family >= NPROTO)) | |
2319 | return -EAFNOSUPPORT; | |
e959d812 | 2320 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2321 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2322 | err = -ENOBUFS; | |
2323 | else { | |
2324 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2325 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2326 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2327 | if (likely(dst_ops->check == NULL)) | |
2328 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2329 | if (likely(dst_ops->negative_advice == NULL)) |
2330 | dst_ops->negative_advice = xfrm_negative_advice; | |
2331 | if (likely(dst_ops->link_failure == NULL)) | |
2332 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2333 | if (likely(afinfo->garbage_collect == NULL)) |
2334 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2335 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2336 | } | |
e959d812 | 2337 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2338 | |
2339 | rtnl_lock(); | |
2340 | for_each_net(net) { | |
2341 | struct dst_ops *xfrm_dst_ops; | |
2342 | ||
2343 | switch (afinfo->family) { | |
2344 | case AF_INET: | |
2345 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2346 | break; | |
2347 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2348 | case AF_INET6: | |
2349 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2350 | break; | |
2351 | #endif | |
2352 | default: | |
2353 | BUG(); | |
2354 | } | |
2355 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2356 | } | |
2357 | rtnl_unlock(); | |
2358 | ||
1da177e4 LT |
2359 | return err; |
2360 | } | |
2361 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2362 | ||
2363 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2364 | { | |
2365 | int err = 0; | |
2366 | if (unlikely(afinfo == NULL)) | |
2367 | return -EINVAL; | |
2368 | if (unlikely(afinfo->family >= NPROTO)) | |
2369 | return -EAFNOSUPPORT; | |
e959d812 | 2370 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2371 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2372 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2373 | err = -EINVAL; | |
2374 | else { | |
2375 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2376 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2377 | dst_ops->kmem_cachep = NULL; | |
2378 | dst_ops->check = NULL; | |
1da177e4 LT |
2379 | dst_ops->negative_advice = NULL; |
2380 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2381 | afinfo->garbage_collect = NULL; |
2382 | } | |
2383 | } | |
e959d812 | 2384 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2385 | return err; |
2386 | } | |
2387 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2388 | ||
d7c7544c AD |
2389 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2390 | { | |
2391 | struct xfrm_policy_afinfo *afinfo; | |
2392 | ||
2393 | read_lock_bh(&xfrm_policy_afinfo_lock); | |
2394 | afinfo = xfrm_policy_afinfo[AF_INET]; | |
2395 | if (afinfo) | |
2396 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
2397 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2398 | afinfo = xfrm_policy_afinfo[AF_INET6]; | |
2399 | if (afinfo) | |
2400 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2401 | #endif | |
2402 | read_unlock_bh(&xfrm_policy_afinfo_lock); | |
2403 | } | |
2404 | ||
1da177e4 LT |
2405 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
2406 | { | |
2407 | struct xfrm_policy_afinfo *afinfo; | |
2408 | if (unlikely(family >= NPROTO)) | |
2409 | return NULL; | |
2410 | read_lock(&xfrm_policy_afinfo_lock); | |
2411 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2412 | if (unlikely(!afinfo)) |
2413 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2414 | return afinfo; |
2415 | } | |
2416 | ||
2417 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2418 | { | |
546be240 HX |
2419 | read_unlock(&xfrm_policy_afinfo_lock); |
2420 | } | |
2421 | ||
1da177e4 LT |
2422 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2423 | { | |
e9dc8653 EB |
2424 | struct net_device *dev = ptr; |
2425 | ||
1da177e4 LT |
2426 | switch (event) { |
2427 | case NETDEV_DOWN: | |
3dd0b499 | 2428 | xfrm_flush_bundles(dev_net(dev)); |
1da177e4 LT |
2429 | } |
2430 | return NOTIFY_DONE; | |
2431 | } | |
2432 | ||
2433 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2434 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2435 | }; |
2436 | ||
558f82ef | 2437 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2438 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2439 | { |
c68cd1a0 AD |
2440 | int rv; |
2441 | ||
7d720c3e | 2442 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
558f82ef MN |
2443 | sizeof(struct linux_xfrm_mib)) < 0) |
2444 | return -ENOMEM; | |
c68cd1a0 AD |
2445 | rv = xfrm_proc_init(net); |
2446 | if (rv < 0) | |
7d720c3e | 2447 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
c68cd1a0 | 2448 | return rv; |
558f82ef | 2449 | } |
59c9940e AD |
2450 | |
2451 | static void xfrm_statistics_fini(struct net *net) | |
2452 | { | |
c68cd1a0 | 2453 | xfrm_proc_fini(net); |
7d720c3e | 2454 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
59c9940e AD |
2455 | } |
2456 | #else | |
2457 | static int __net_init xfrm_statistics_init(struct net *net) | |
2458 | { | |
2459 | return 0; | |
2460 | } | |
2461 | ||
2462 | static void xfrm_statistics_fini(struct net *net) | |
2463 | { | |
2464 | } | |
558f82ef MN |
2465 | #endif |
2466 | ||
d62ddc21 | 2467 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2468 | { |
2518c7c2 DM |
2469 | unsigned int hmask, sz; |
2470 | int dir; | |
2471 | ||
d62ddc21 AD |
2472 | if (net_eq(net, &init_net)) |
2473 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2474 | sizeof(struct xfrm_dst), |
e5d679f3 | 2475 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2476 | NULL); |
1da177e4 | 2477 | |
2518c7c2 DM |
2478 | hmask = 8 - 1; |
2479 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2480 | ||
93b851c1 AD |
2481 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2482 | if (!net->xfrm.policy_byidx) | |
2483 | goto out_byidx; | |
8100bea7 | 2484 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2485 | |
2486 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2487 | struct xfrm_policy_hash *htab; | |
2488 | ||
dc2caba7 | 2489 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2490 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2491 | |
a35f6c5d | 2492 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2493 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2494 | if (!htab->table) |
a35f6c5d AD |
2495 | goto out_bydst; |
2496 | htab->hmask = hmask; | |
2518c7c2 DM |
2497 | } |
2498 | ||
adfcf0b2 | 2499 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2500 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2501 | if (net_eq(net, &init_net)) |
2502 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2503 | return 0; | |
93b851c1 | 2504 | |
a35f6c5d AD |
2505 | out_bydst: |
2506 | for (dir--; dir >= 0; dir--) { | |
2507 | struct xfrm_policy_hash *htab; | |
2508 | ||
2509 | htab = &net->xfrm.policy_bydst[dir]; | |
2510 | xfrm_hash_free(htab->table, sz); | |
2511 | } | |
2512 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2513 | out_byidx: |
2514 | return -ENOMEM; | |
d62ddc21 AD |
2515 | } |
2516 | ||
2517 | static void xfrm_policy_fini(struct net *net) | |
2518 | { | |
7c2776ee | 2519 | struct xfrm_audit audit_info; |
93b851c1 | 2520 | unsigned int sz; |
8b18f8ea | 2521 | int dir; |
93b851c1 | 2522 | |
7c2776ee AD |
2523 | flush_work(&net->xfrm.policy_hash_work); |
2524 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2525 | audit_info.loginuid = -1; | |
2526 | audit_info.sessionid = -1; | |
2527 | audit_info.secid = 0; | |
2528 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2529 | #endif | |
2530 | audit_info.loginuid = -1; | |
2531 | audit_info.sessionid = -1; | |
2532 | audit_info.secid = 0; | |
2533 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
2534 | flush_work(&xfrm_policy_gc_work); | |
2535 | ||
adfcf0b2 | 2536 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2537 | |
8b18f8ea | 2538 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2539 | struct xfrm_policy_hash *htab; |
2540 | ||
8b18f8ea | 2541 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2542 | |
2543 | htab = &net->xfrm.policy_bydst[dir]; | |
2544 | sz = (htab->hmask + 1); | |
2545 | WARN_ON(!hlist_empty(htab->table)); | |
2546 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2547 | } |
2548 | ||
8100bea7 | 2549 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2550 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2551 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2552 | } |
2553 | ||
d62ddc21 AD |
2554 | static int __net_init xfrm_net_init(struct net *net) |
2555 | { | |
2556 | int rv; | |
2557 | ||
59c9940e AD |
2558 | rv = xfrm_statistics_init(net); |
2559 | if (rv < 0) | |
2560 | goto out_statistics; | |
d62ddc21 AD |
2561 | rv = xfrm_state_init(net); |
2562 | if (rv < 0) | |
2563 | goto out_state; | |
2564 | rv = xfrm_policy_init(net); | |
2565 | if (rv < 0) | |
2566 | goto out_policy; | |
d7c7544c | 2567 | xfrm_dst_ops_init(net); |
b27aeadb AD |
2568 | rv = xfrm_sysctl_init(net); |
2569 | if (rv < 0) | |
2570 | goto out_sysctl; | |
d62ddc21 AD |
2571 | return 0; |
2572 | ||
b27aeadb AD |
2573 | out_sysctl: |
2574 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2575 | out_policy: |
2576 | xfrm_state_fini(net); | |
2577 | out_state: | |
59c9940e AD |
2578 | xfrm_statistics_fini(net); |
2579 | out_statistics: | |
d62ddc21 AD |
2580 | return rv; |
2581 | } | |
2582 | ||
2583 | static void __net_exit xfrm_net_exit(struct net *net) | |
2584 | { | |
b27aeadb | 2585 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2586 | xfrm_policy_fini(net); |
2587 | xfrm_state_fini(net); | |
59c9940e | 2588 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2589 | } |
2590 | ||
2591 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2592 | .init = xfrm_net_init, | |
2593 | .exit = xfrm_net_exit, | |
2594 | }; | |
2595 | ||
1da177e4 LT |
2596 | void __init xfrm_init(void) |
2597 | { | |
d62ddc21 | 2598 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
2599 | xfrm_input_init(); |
2600 | } | |
2601 | ||
ab5f5e8b | 2602 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2603 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2604 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2605 | { |
875179fa PM |
2606 | struct xfrm_sec_ctx *ctx = xp->security; |
2607 | struct xfrm_selector *sel = &xp->selector; | |
2608 | ||
2609 | if (ctx) | |
ab5f5e8b | 2610 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2611 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2612 | |
875179fa | 2613 | switch(sel->family) { |
ab5f5e8b | 2614 | case AF_INET: |
21454aaa | 2615 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2616 | if (sel->prefixlen_s != 32) |
2617 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2618 | sel->prefixlen_s); | |
21454aaa | 2619 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2620 | if (sel->prefixlen_d != 32) |
2621 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2622 | sel->prefixlen_d); | |
ab5f5e8b JL |
2623 | break; |
2624 | case AF_INET6: | |
5b095d98 | 2625 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2626 | if (sel->prefixlen_s != 128) |
2627 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2628 | sel->prefixlen_s); | |
5b095d98 | 2629 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2630 | if (sel->prefixlen_d != 128) |
2631 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2632 | sel->prefixlen_d); | |
ab5f5e8b JL |
2633 | break; |
2634 | } | |
2635 | } | |
2636 | ||
68277acc | 2637 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2638 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2639 | { |
2640 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2641 | |
afeb14b4 | 2642 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2643 | if (audit_buf == NULL) |
2644 | return; | |
2532386f | 2645 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2646 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2647 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2648 | audit_log_end(audit_buf); | |
2649 | } | |
2650 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2651 | ||
68277acc | 2652 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2653 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2654 | { |
2655 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2656 | |
afeb14b4 | 2657 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2658 | if (audit_buf == NULL) |
2659 | return; | |
2532386f | 2660 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2661 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2662 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2663 | audit_log_end(audit_buf); | |
2664 | } | |
2665 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2666 | #endif | |
2667 | ||
80c9abaa SS |
2668 | #ifdef CONFIG_XFRM_MIGRATE |
2669 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2670 | struct xfrm_selector *sel_tgt) | |
2671 | { | |
2672 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2673 | if (sel_tgt->family == sel_cmp->family && | |
2674 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2675 | sel_cmp->family) == 0 && |
80c9abaa SS |
2676 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2677 | sel_cmp->family) == 0 && | |
2678 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2679 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2680 | return 1; | |
2681 | } | |
2682 | } else { | |
2683 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2684 | return 1; | |
2685 | } | |
2686 | } | |
2687 | return 0; | |
2688 | } | |
2689 | ||
2690 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2691 | u8 dir, u8 type) | |
2692 | { | |
2693 | struct xfrm_policy *pol, *ret = NULL; | |
2694 | struct hlist_node *entry; | |
2695 | struct hlist_head *chain; | |
2696 | u32 priority = ~0U; | |
2697 | ||
2698 | read_lock_bh(&xfrm_policy_lock); | |
1121994c | 2699 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
80c9abaa SS |
2700 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2701 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2702 | pol->type == type) { | |
2703 | ret = pol; | |
2704 | priority = ret->priority; | |
2705 | break; | |
2706 | } | |
2707 | } | |
8b18f8ea | 2708 | chain = &init_net.xfrm.policy_inexact[dir]; |
80c9abaa SS |
2709 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2710 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2711 | pol->type == type && | |
2712 | pol->priority < priority) { | |
2713 | ret = pol; | |
2714 | break; | |
2715 | } | |
2716 | } | |
2717 | ||
2718 | if (ret) | |
2719 | xfrm_pol_hold(ret); | |
2720 | ||
2721 | read_unlock_bh(&xfrm_policy_lock); | |
2722 | ||
2723 | return ret; | |
2724 | } | |
2725 | ||
2726 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2727 | { | |
2728 | int match = 0; | |
2729 | ||
2730 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2731 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2732 | switch (t->mode) { | |
2733 | case XFRM_MODE_TUNNEL: | |
2734 | case XFRM_MODE_BEET: | |
2735 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2736 | m->old_family) == 0 && | |
2737 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2738 | m->old_family) == 0) { | |
2739 | match = 1; | |
2740 | } | |
2741 | break; | |
2742 | case XFRM_MODE_TRANSPORT: | |
2743 | /* in case of transport mode, template does not store | |
2744 | any IP addresses, hence we just compare mode and | |
2745 | protocol */ | |
2746 | match = 1; | |
2747 | break; | |
2748 | default: | |
2749 | break; | |
2750 | } | |
2751 | } | |
2752 | return match; | |
2753 | } | |
2754 | ||
2755 | /* update endpoint address(es) of template(s) */ | |
2756 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2757 | struct xfrm_migrate *m, int num_migrate) | |
2758 | { | |
2759 | struct xfrm_migrate *mp; | |
2760 | struct dst_entry *dst; | |
2761 | int i, j, n = 0; | |
2762 | ||
2763 | write_lock_bh(&pol->lock); | |
12a169e7 | 2764 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2765 | /* target policy has been deleted */ |
2766 | write_unlock_bh(&pol->lock); | |
2767 | return -ENOENT; | |
2768 | } | |
2769 | ||
2770 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2771 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2772 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2773 | continue; | |
2774 | n++; | |
1bfcb10f HX |
2775 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2776 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2777 | continue; |
2778 | /* update endpoints */ | |
2779 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2780 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2781 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2782 | sizeof(pol->xfrm_vec[i].saddr)); | |
2783 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2784 | /* flush bundles */ | |
2785 | while ((dst = pol->bundles) != NULL) { | |
2786 | pol->bundles = dst->next; | |
2787 | dst_free(dst); | |
2788 | } | |
2789 | } | |
2790 | } | |
2791 | ||
2792 | write_unlock_bh(&pol->lock); | |
2793 | ||
2794 | if (!n) | |
2795 | return -ENODATA; | |
2796 | ||
2797 | return 0; | |
2798 | } | |
2799 | ||
2800 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2801 | { | |
2802 | int i, j; | |
2803 | ||
2804 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2805 | return -EINVAL; | |
2806 | ||
2807 | for (i = 0; i < num_migrate; i++) { | |
2808 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2809 | m[i].old_family) == 0) && | |
2810 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2811 | m[i].old_family) == 0)) | |
2812 | return -EINVAL; | |
2813 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2814 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2815 | return -EINVAL; | |
2816 | ||
2817 | /* check if there is any duplicated entry */ | |
2818 | for (j = i + 1; j < num_migrate; j++) { | |
2819 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2820 | sizeof(m[i].old_daddr)) && | |
2821 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2822 | sizeof(m[i].old_saddr)) && | |
2823 | m[i].proto == m[j].proto && | |
2824 | m[i].mode == m[j].mode && | |
2825 | m[i].reqid == m[j].reqid && | |
2826 | m[i].old_family == m[j].old_family) | |
2827 | return -EINVAL; | |
2828 | } | |
2829 | } | |
2830 | ||
2831 | return 0; | |
2832 | } | |
2833 | ||
2834 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
13c1d189 AE |
2835 | struct xfrm_migrate *m, int num_migrate, |
2836 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2837 | { |
2838 | int i, err, nx_cur = 0, nx_new = 0; | |
2839 | struct xfrm_policy *pol = NULL; | |
2840 | struct xfrm_state *x, *xc; | |
2841 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2842 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2843 | struct xfrm_migrate *mp; | |
2844 | ||
2845 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2846 | goto out; | |
2847 | ||
2848 | /* Stage 1 - find policy */ | |
2849 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2850 | err = -ENOENT; | |
2851 | goto out; | |
2852 | } | |
2853 | ||
2854 | /* Stage 2 - find and update state(s) */ | |
2855 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2856 | if ((x = xfrm_migrate_state_find(mp))) { | |
2857 | x_cur[nx_cur] = x; | |
2858 | nx_cur++; | |
2859 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2860 | x_new[nx_new] = xc; | |
2861 | nx_new++; | |
2862 | } else { | |
2863 | err = -ENODATA; | |
2864 | goto restore_state; | |
2865 | } | |
2866 | } | |
2867 | } | |
2868 | ||
2869 | /* Stage 3 - update policy */ | |
2870 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2871 | goto restore_state; | |
2872 | ||
2873 | /* Stage 4 - delete old state(s) */ | |
2874 | if (nx_cur) { | |
2875 | xfrm_states_put(x_cur, nx_cur); | |
2876 | xfrm_states_delete(x_cur, nx_cur); | |
2877 | } | |
2878 | ||
2879 | /* Stage 5 - announce */ | |
13c1d189 | 2880 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2881 | |
2882 | xfrm_pol_put(pol); | |
2883 | ||
2884 | return 0; | |
2885 | out: | |
2886 | return err; | |
2887 | ||
2888 | restore_state: | |
2889 | if (pol) | |
2890 | xfrm_pol_put(pol); | |
2891 | if (nx_cur) | |
2892 | xfrm_states_put(x_cur, nx_cur); | |
2893 | if (nx_new) | |
2894 | xfrm_states_delete(x_new, nx_new); | |
2895 | ||
2896 | return err; | |
2897 | } | |
e610e679 | 2898 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2899 | #endif |