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 | 39 | |
80c802f3 TT |
40 | static DEFINE_SPINLOCK(xfrm_policy_sk_bundle_lock); |
41 | static struct dst_entry *xfrm_policy_sk_bundles; | |
1da177e4 LT |
42 | static DEFINE_RWLOCK(xfrm_policy_lock); |
43 | ||
1da177e4 LT |
44 | static DEFINE_RWLOCK(xfrm_policy_afinfo_lock); |
45 | static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO]; | |
46 | ||
e18b890b | 47 | static struct kmem_cache *xfrm_dst_cache __read_mostly; |
1da177e4 | 48 | |
1da177e4 LT |
49 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family); |
50 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo); | |
25ee3286 | 51 | static void xfrm_init_pmtu(struct dst_entry *dst); |
80c802f3 | 52 | static int stale_bundle(struct dst_entry *dst); |
1da177e4 | 53 | |
29fa0b30 WY |
54 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
55 | int dir); | |
56 | ||
77681021 AM |
57 | static inline int |
58 | __xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
59 | { | |
60 | return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) && | |
61 | addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) && | |
62 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
63 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
64 | (fl->proto == sel->proto || !sel->proto) && | |
65 | (fl->oif == sel->ifindex || !sel->ifindex); | |
66 | } | |
67 | ||
68 | static inline int | |
69 | __xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl) | |
70 | { | |
71 | return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) && | |
72 | addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) && | |
73 | !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) && | |
74 | !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) && | |
75 | (fl->proto == sel->proto || !sel->proto) && | |
76 | (fl->oif == sel->ifindex || !sel->ifindex); | |
77 | } | |
78 | ||
79 | int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl, | |
80 | unsigned short family) | |
81 | { | |
82 | switch (family) { | |
83 | case AF_INET: | |
84 | return __xfrm4_selector_match(sel, fl); | |
85 | case AF_INET6: | |
86 | return __xfrm6_selector_match(sel, fl); | |
87 | } | |
88 | return 0; | |
89 | } | |
90 | ||
c5b3cf46 | 91 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
9bb182a7 YH |
92 | xfrm_address_t *saddr, |
93 | xfrm_address_t *daddr, | |
94 | int family) | |
95 | { | |
96 | struct xfrm_policy_afinfo *afinfo; | |
97 | struct dst_entry *dst; | |
98 | ||
99 | afinfo = xfrm_policy_get_afinfo(family); | |
100 | if (unlikely(afinfo == NULL)) | |
101 | return ERR_PTR(-EAFNOSUPPORT); | |
102 | ||
c5b3cf46 | 103 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); |
9bb182a7 YH |
104 | |
105 | xfrm_policy_put_afinfo(afinfo); | |
106 | ||
107 | return dst; | |
108 | } | |
109 | ||
25ee3286 | 110 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
111 | xfrm_address_t *prev_saddr, |
112 | xfrm_address_t *prev_daddr, | |
25ee3286 | 113 | int family) |
1da177e4 | 114 | { |
c5b3cf46 | 115 | struct net *net = xs_net(x); |
66cdb3ca HX |
116 | xfrm_address_t *saddr = &x->props.saddr; |
117 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
118 | struct dst_entry *dst; |
119 | ||
9bb182a7 | 120 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 121 | saddr = x->coaddr; |
9bb182a7 YH |
122 | daddr = prev_daddr; |
123 | } | |
124 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
125 | saddr = prev_saddr; | |
66cdb3ca | 126 | daddr = x->coaddr; |
9bb182a7 | 127 | } |
1da177e4 | 128 | |
c5b3cf46 | 129 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); |
9bb182a7 YH |
130 | |
131 | if (!IS_ERR(dst)) { | |
132 | if (prev_saddr != saddr) | |
133 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
134 | if (prev_daddr != daddr) | |
135 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
136 | } | |
1da177e4 | 137 | |
66cdb3ca | 138 | return dst; |
1da177e4 | 139 | } |
1da177e4 | 140 | |
1da177e4 LT |
141 | static inline unsigned long make_jiffies(long secs) |
142 | { | |
143 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
144 | return MAX_SCHEDULE_TIMEOUT-1; | |
145 | else | |
a716c119 | 146 | return secs*HZ; |
1da177e4 LT |
147 | } |
148 | ||
149 | static void xfrm_policy_timer(unsigned long data) | |
150 | { | |
151 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 152 | unsigned long now = get_seconds(); |
1da177e4 LT |
153 | long next = LONG_MAX; |
154 | int warn = 0; | |
155 | int dir; | |
156 | ||
157 | read_lock(&xp->lock); | |
158 | ||
ea2dea9d | 159 | if (unlikely(xp->walk.dead)) |
1da177e4 LT |
160 | goto out; |
161 | ||
77d8d7a6 | 162 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
163 | |
164 | if (xp->lft.hard_add_expires_seconds) { | |
165 | long tmo = xp->lft.hard_add_expires_seconds + | |
166 | xp->curlft.add_time - now; | |
167 | if (tmo <= 0) | |
168 | goto expired; | |
169 | if (tmo < next) | |
170 | next = tmo; | |
171 | } | |
172 | if (xp->lft.hard_use_expires_seconds) { | |
173 | long tmo = xp->lft.hard_use_expires_seconds + | |
174 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
175 | if (tmo <= 0) | |
176 | goto expired; | |
177 | if (tmo < next) | |
178 | next = tmo; | |
179 | } | |
180 | if (xp->lft.soft_add_expires_seconds) { | |
181 | long tmo = xp->lft.soft_add_expires_seconds + | |
182 | xp->curlft.add_time - now; | |
183 | if (tmo <= 0) { | |
184 | warn = 1; | |
185 | tmo = XFRM_KM_TIMEOUT; | |
186 | } | |
187 | if (tmo < next) | |
188 | next = tmo; | |
189 | } | |
190 | if (xp->lft.soft_use_expires_seconds) { | |
191 | long tmo = xp->lft.soft_use_expires_seconds + | |
192 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
193 | if (tmo <= 0) { | |
194 | warn = 1; | |
195 | tmo = XFRM_KM_TIMEOUT; | |
196 | } | |
197 | if (tmo < next) | |
198 | next = tmo; | |
199 | } | |
200 | ||
201 | if (warn) | |
6c5c8ca7 | 202 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
203 | if (next != LONG_MAX && |
204 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
205 | xfrm_pol_hold(xp); | |
206 | ||
207 | out: | |
208 | read_unlock(&xp->lock); | |
209 | xfrm_pol_put(xp); | |
210 | return; | |
211 | ||
212 | expired: | |
213 | read_unlock(&xp->lock); | |
4666faab | 214 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 215 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
216 | xfrm_pol_put(xp); |
217 | } | |
218 | ||
fe1a5f03 TT |
219 | static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) |
220 | { | |
221 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
222 | ||
223 | if (unlikely(pol->walk.dead)) | |
224 | flo = NULL; | |
225 | else | |
226 | xfrm_pol_hold(pol); | |
227 | ||
228 | return flo; | |
229 | } | |
230 | ||
231 | static int xfrm_policy_flo_check(struct flow_cache_object *flo) | |
232 | { | |
233 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
234 | ||
235 | return !pol->walk.dead; | |
236 | } | |
237 | ||
238 | static void xfrm_policy_flo_delete(struct flow_cache_object *flo) | |
239 | { | |
240 | xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); | |
241 | } | |
242 | ||
243 | static const struct flow_cache_ops xfrm_policy_fc_ops = { | |
244 | .get = xfrm_policy_flo_get, | |
245 | .check = xfrm_policy_flo_check, | |
246 | .delete = xfrm_policy_flo_delete, | |
247 | }; | |
1da177e4 LT |
248 | |
249 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
250 | * SPD calls. | |
251 | */ | |
252 | ||
0331b1f3 | 253 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
254 | { |
255 | struct xfrm_policy *policy; | |
256 | ||
0da974f4 | 257 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
258 | |
259 | if (policy) { | |
0331b1f3 | 260 | write_pnet(&policy->xp_net, net); |
12a169e7 | 261 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
262 | INIT_HLIST_NODE(&policy->bydst); |
263 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 264 | rwlock_init(&policy->lock); |
2518c7c2 | 265 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
266 | setup_timer(&policy->timer, xfrm_policy_timer, |
267 | (unsigned long)policy); | |
fe1a5f03 | 268 | policy->flo.ops = &xfrm_policy_fc_ops; |
1da177e4 LT |
269 | } |
270 | return policy; | |
271 | } | |
272 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
273 | ||
274 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
275 | ||
64c31b3f | 276 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 277 | { |
12a169e7 | 278 | BUG_ON(!policy->walk.dead); |
1da177e4 | 279 | |
1da177e4 LT |
280 | if (del_timer(&policy->timer)) |
281 | BUG(); | |
282 | ||
03e1ad7b | 283 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
284 | kfree(policy); |
285 | } | |
64c31b3f | 286 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 | 287 | |
1da177e4 LT |
288 | /* Rule must be locked. Release descentant resources, announce |
289 | * entry dead. The rule must be unlinked from lists to the moment. | |
290 | */ | |
291 | ||
292 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
293 | { | |
12a169e7 | 294 | policy->walk.dead = 1; |
1da177e4 | 295 | |
285ead17 | 296 | atomic_inc(&policy->genid); |
1da177e4 | 297 | |
285ead17 TT |
298 | if (del_timer(&policy->timer)) |
299 | xfrm_pol_put(policy); | |
300 | ||
301 | xfrm_pol_put(policy); | |
1da177e4 LT |
302 | } |
303 | ||
2518c7c2 DM |
304 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
305 | ||
e92303f8 | 306 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 307 | { |
e92303f8 | 308 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
309 | } |
310 | ||
1121994c | 311 | static struct hlist_head *policy_hash_bysel(struct net *net, struct xfrm_selector *sel, unsigned short family, int dir) |
2518c7c2 | 312 | { |
1121994c | 313 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
314 | unsigned int hash = __sel_hash(sel, family, hmask); |
315 | ||
316 | return (hash == hmask + 1 ? | |
1121994c AD |
317 | &net->xfrm.policy_inexact[dir] : |
318 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
319 | } |
320 | ||
1121994c | 321 | static struct hlist_head *policy_hash_direct(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir) |
2518c7c2 | 322 | { |
1121994c | 323 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
324 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
325 | ||
1121994c | 326 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
327 | } |
328 | ||
2518c7c2 DM |
329 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
330 | struct hlist_head *ndsttable, | |
331 | unsigned int nhashmask) | |
332 | { | |
b791160b | 333 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 334 | struct xfrm_policy *pol; |
b791160b | 335 | unsigned int h0 = 0; |
2518c7c2 | 336 | |
b791160b | 337 | redo: |
2518c7c2 DM |
338 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
339 | unsigned int h; | |
340 | ||
341 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
342 | pol->family, nhashmask); | |
b791160b YH |
343 | if (!entry0) { |
344 | hlist_del(entry); | |
345 | hlist_add_head(&pol->bydst, ndsttable+h); | |
346 | h0 = h; | |
347 | } else { | |
348 | if (h != h0) | |
349 | continue; | |
350 | hlist_del(entry); | |
351 | hlist_add_after(entry0, &pol->bydst); | |
352 | } | |
353 | entry0 = entry; | |
354 | } | |
355 | if (!hlist_empty(list)) { | |
356 | entry0 = NULL; | |
357 | goto redo; | |
2518c7c2 DM |
358 | } |
359 | } | |
360 | ||
361 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
362 | struct hlist_head *nidxtable, | |
363 | unsigned int nhashmask) | |
364 | { | |
365 | struct hlist_node *entry, *tmp; | |
366 | struct xfrm_policy *pol; | |
367 | ||
368 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
369 | unsigned int h; | |
370 | ||
371 | h = __idx_hash(pol->index, nhashmask); | |
372 | hlist_add_head(&pol->byidx, nidxtable+h); | |
373 | } | |
374 | } | |
375 | ||
376 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
377 | { | |
378 | return ((old_hmask + 1) << 1) - 1; | |
379 | } | |
380 | ||
66caf628 | 381 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 382 | { |
66caf628 | 383 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
384 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
385 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 386 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 387 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
388 | int i; |
389 | ||
390 | if (!ndst) | |
391 | return; | |
392 | ||
393 | write_lock_bh(&xfrm_policy_lock); | |
394 | ||
395 | for (i = hmask; i >= 0; i--) | |
396 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
397 | ||
66caf628 AD |
398 | net->xfrm.policy_bydst[dir].table = ndst; |
399 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 DM |
400 | |
401 | write_unlock_bh(&xfrm_policy_lock); | |
402 | ||
44e36b42 | 403 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
404 | } |
405 | ||
66caf628 | 406 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 407 | { |
66caf628 | 408 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
409 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
410 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 411 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 412 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
413 | int i; |
414 | ||
415 | if (!nidx) | |
416 | return; | |
417 | ||
418 | write_lock_bh(&xfrm_policy_lock); | |
419 | ||
420 | for (i = hmask; i >= 0; i--) | |
421 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
422 | ||
66caf628 AD |
423 | net->xfrm.policy_byidx = nidx; |
424 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 DM |
425 | |
426 | write_unlock_bh(&xfrm_policy_lock); | |
427 | ||
44e36b42 | 428 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
429 | } |
430 | ||
66caf628 | 431 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 432 | { |
66caf628 AD |
433 | unsigned int cnt = net->xfrm.policy_count[dir]; |
434 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
435 | |
436 | if (total) | |
437 | *total += cnt; | |
438 | ||
439 | if ((hmask + 1) < xfrm_policy_hashmax && | |
440 | cnt > hmask) | |
441 | return 1; | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
66caf628 | 446 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 447 | { |
66caf628 | 448 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
449 | |
450 | if ((hmask + 1) < xfrm_policy_hashmax && | |
451 | total > hmask) | |
452 | return 1; | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
e071041b | 457 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
458 | { |
459 | read_lock_bh(&xfrm_policy_lock); | |
e071041b AD |
460 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
461 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
462 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
463 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
464 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
465 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
466 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 JHS |
467 | si->spdhmcnt = xfrm_policy_hashmax; |
468 | read_unlock_bh(&xfrm_policy_lock); | |
469 | } | |
470 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 471 | |
ecfd6b18 | 472 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 473 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 474 | { |
66caf628 | 475 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
476 | int dir, total; |
477 | ||
478 | mutex_lock(&hash_resize_mutex); | |
479 | ||
480 | total = 0; | |
481 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
482 | if (xfrm_bydst_should_resize(net, dir, &total)) |
483 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 484 | } |
66caf628 AD |
485 | if (xfrm_byidx_should_resize(net, total)) |
486 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
487 | |
488 | mutex_unlock(&hash_resize_mutex); | |
489 | } | |
490 | ||
1da177e4 LT |
491 | /* Generate new index... KAME seems to generate them ordered by cost |
492 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
1121994c | 493 | static u32 xfrm_gen_index(struct net *net, int dir) |
1da177e4 | 494 | { |
1da177e4 LT |
495 | static u32 idx_generator; |
496 | ||
497 | for (;;) { | |
2518c7c2 DM |
498 | struct hlist_node *entry; |
499 | struct hlist_head *list; | |
500 | struct xfrm_policy *p; | |
501 | u32 idx; | |
502 | int found; | |
503 | ||
1da177e4 LT |
504 | idx = (idx_generator | dir); |
505 | idx_generator += 8; | |
506 | if (idx == 0) | |
507 | idx = 8; | |
1121994c | 508 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 DM |
509 | found = 0; |
510 | hlist_for_each_entry(p, entry, list, byidx) { | |
511 | if (p->index == idx) { | |
512 | found = 1; | |
1da177e4 | 513 | break; |
2518c7c2 | 514 | } |
1da177e4 | 515 | } |
2518c7c2 | 516 | if (!found) |
1da177e4 LT |
517 | return idx; |
518 | } | |
519 | } | |
520 | ||
2518c7c2 DM |
521 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
522 | { | |
523 | u32 *p1 = (u32 *) s1; | |
524 | u32 *p2 = (u32 *) s2; | |
525 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
526 | int i; | |
527 | ||
528 | for (i = 0; i < len; i++) { | |
529 | if (p1[i] != p2[i]) | |
530 | return 1; | |
531 | } | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
1da177e4 LT |
536 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
537 | { | |
1121994c | 538 | struct net *net = xp_net(policy); |
2518c7c2 DM |
539 | struct xfrm_policy *pol; |
540 | struct xfrm_policy *delpol; | |
541 | struct hlist_head *chain; | |
a6c7ab55 | 542 | struct hlist_node *entry, *newpos; |
34f8d884 | 543 | u32 mark = policy->mark.v & policy->mark.m; |
1da177e4 LT |
544 | |
545 | write_lock_bh(&xfrm_policy_lock); | |
1121994c | 546 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
547 | delpol = NULL; |
548 | newpos = NULL; | |
2518c7c2 | 549 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 550 | if (pol->type == policy->type && |
2518c7c2 | 551 | !selector_cmp(&pol->selector, &policy->selector) && |
34f8d884 | 552 | (mark & pol->mark.m) == pol->mark.v && |
a6c7ab55 HX |
553 | xfrm_sec_ctx_match(pol->security, policy->security) && |
554 | !WARN_ON(delpol)) { | |
1da177e4 LT |
555 | if (excl) { |
556 | write_unlock_bh(&xfrm_policy_lock); | |
557 | return -EEXIST; | |
558 | } | |
1da177e4 LT |
559 | delpol = pol; |
560 | if (policy->priority > pol->priority) | |
561 | continue; | |
562 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 563 | newpos = &pol->bydst; |
1da177e4 LT |
564 | continue; |
565 | } | |
1da177e4 LT |
566 | if (delpol) |
567 | break; | |
1da177e4 LT |
568 | } |
569 | if (newpos) | |
2518c7c2 DM |
570 | hlist_add_after(newpos, &policy->bydst); |
571 | else | |
572 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 573 | xfrm_pol_hold(policy); |
1121994c | 574 | net->xfrm.policy_count[dir]++; |
1da177e4 | 575 | atomic_inc(&flow_cache_genid); |
29fa0b30 WY |
576 | if (delpol) |
577 | __xfrm_policy_unlink(delpol, dir); | |
1121994c AD |
578 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
579 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); | |
9d729f72 | 580 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
581 | policy->curlft.use_time = 0; |
582 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
583 | xfrm_pol_hold(policy); | |
1121994c | 584 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
1da177e4 LT |
585 | write_unlock_bh(&xfrm_policy_lock); |
586 | ||
9b78a82c | 587 | if (delpol) |
1da177e4 | 588 | xfrm_policy_kill(delpol); |
1121994c AD |
589 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
590 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c | 591 | |
1da177e4 LT |
592 | return 0; |
593 | } | |
594 | EXPORT_SYMBOL(xfrm_policy_insert); | |
595 | ||
8ca2e93b JHS |
596 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
597 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
598 | struct xfrm_sec_ctx *ctx, int delete, |
599 | int *err) | |
1da177e4 | 600 | { |
2518c7c2 DM |
601 | struct xfrm_policy *pol, *ret; |
602 | struct hlist_head *chain; | |
603 | struct hlist_node *entry; | |
1da177e4 | 604 | |
ef41aaa0 | 605 | *err = 0; |
1da177e4 | 606 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 607 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 DM |
608 | ret = NULL; |
609 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
610 | if (pol->type == type && | |
34f8d884 | 611 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
612 | !selector_cmp(sel, &pol->selector) && |
613 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 614 | xfrm_pol_hold(pol); |
2518c7c2 | 615 | if (delete) { |
03e1ad7b PM |
616 | *err = security_xfrm_policy_delete( |
617 | pol->security); | |
ef41aaa0 EP |
618 | if (*err) { |
619 | write_unlock_bh(&xfrm_policy_lock); | |
620 | return pol; | |
621 | } | |
29fa0b30 | 622 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
623 | } |
624 | ret = pol; | |
1da177e4 LT |
625 | break; |
626 | } | |
627 | } | |
628 | write_unlock_bh(&xfrm_policy_lock); | |
629 | ||
fe1a5f03 | 630 | if (ret && delete) |
2518c7c2 | 631 | xfrm_policy_kill(ret); |
2518c7c2 | 632 | return ret; |
1da177e4 | 633 | } |
df71837d | 634 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 635 | |
8ca2e93b JHS |
636 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
637 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 638 | { |
2518c7c2 DM |
639 | struct xfrm_policy *pol, *ret; |
640 | struct hlist_head *chain; | |
641 | struct hlist_node *entry; | |
1da177e4 | 642 | |
b5505c6e HX |
643 | *err = -ENOENT; |
644 | if (xfrm_policy_id2dir(id) != dir) | |
645 | return NULL; | |
646 | ||
ef41aaa0 | 647 | *err = 0; |
1da177e4 | 648 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 649 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 DM |
650 | ret = NULL; |
651 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
34f8d884 JHS |
652 | if (pol->type == type && pol->index == id && |
653 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 654 | xfrm_pol_hold(pol); |
2518c7c2 | 655 | if (delete) { |
03e1ad7b PM |
656 | *err = security_xfrm_policy_delete( |
657 | pol->security); | |
ef41aaa0 EP |
658 | if (*err) { |
659 | write_unlock_bh(&xfrm_policy_lock); | |
660 | return pol; | |
661 | } | |
29fa0b30 | 662 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
663 | } |
664 | ret = pol; | |
1da177e4 LT |
665 | break; |
666 | } | |
667 | } | |
668 | write_unlock_bh(&xfrm_policy_lock); | |
669 | ||
fe1a5f03 | 670 | if (ret && delete) |
2518c7c2 | 671 | xfrm_policy_kill(ret); |
2518c7c2 | 672 | return ret; |
1da177e4 LT |
673 | } |
674 | EXPORT_SYMBOL(xfrm_policy_byid); | |
675 | ||
4aa2e62c JL |
676 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
677 | static inline int | |
33ffbbd5 | 678 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 679 | { |
4aa2e62c JL |
680 | int dir, err = 0; |
681 | ||
682 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
683 | struct xfrm_policy *pol; | |
684 | struct hlist_node *entry; | |
685 | int i; | |
686 | ||
687 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 688 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
689 | if (pol->type != type) |
690 | continue; | |
03e1ad7b | 691 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 692 | if (err) { |
ab5f5e8b JL |
693 | xfrm_audit_policy_delete(pol, 0, |
694 | audit_info->loginuid, | |
2532386f | 695 | audit_info->sessionid, |
ab5f5e8b | 696 | audit_info->secid); |
4aa2e62c JL |
697 | return err; |
698 | } | |
7dc12d6d | 699 | } |
33ffbbd5 | 700 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
4aa2e62c | 701 | hlist_for_each_entry(pol, entry, |
33ffbbd5 | 702 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
703 | bydst) { |
704 | if (pol->type != type) | |
705 | continue; | |
03e1ad7b PM |
706 | err = security_xfrm_policy_delete( |
707 | pol->security); | |
4aa2e62c | 708 | if (err) { |
ab5f5e8b JL |
709 | xfrm_audit_policy_delete(pol, 0, |
710 | audit_info->loginuid, | |
2532386f | 711 | audit_info->sessionid, |
ab5f5e8b | 712 | audit_info->secid); |
4aa2e62c JL |
713 | return err; |
714 | } | |
715 | } | |
716 | } | |
717 | } | |
718 | return err; | |
719 | } | |
720 | #else | |
721 | static inline int | |
33ffbbd5 | 722 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
723 | { |
724 | return 0; | |
725 | } | |
726 | #endif | |
727 | ||
33ffbbd5 | 728 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c | 729 | { |
2f1eb65f | 730 | int dir, err = 0, cnt = 0; |
1da177e4 LT |
731 | |
732 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c | 733 | |
33ffbbd5 | 734 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
735 | if (err) |
736 | goto out; | |
737 | ||
1da177e4 | 738 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
739 | struct xfrm_policy *pol; |
740 | struct hlist_node *entry; | |
29fa0b30 | 741 | int i; |
2518c7c2 DM |
742 | |
743 | again1: | |
744 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 745 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
746 | if (pol->type != type) |
747 | continue; | |
ea2dea9d | 748 | __xfrm_policy_unlink(pol, dir); |
1da177e4 | 749 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 750 | cnt++; |
1da177e4 | 751 | |
ab5f5e8b | 752 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 753 | audit_info->sessionid, |
ab5f5e8b | 754 | audit_info->secid); |
161a09e7 | 755 | |
2518c7c2 | 756 | xfrm_policy_kill(pol); |
1da177e4 LT |
757 | |
758 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
759 | goto again1; |
760 | } | |
761 | ||
33ffbbd5 | 762 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 DM |
763 | again2: |
764 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 765 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
766 | bydst) { |
767 | if (pol->type != type) | |
768 | continue; | |
ea2dea9d | 769 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 | 770 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 771 | cnt++; |
2518c7c2 | 772 | |
ab5f5e8b JL |
773 | xfrm_audit_policy_delete(pol, 1, |
774 | audit_info->loginuid, | |
2532386f | 775 | audit_info->sessionid, |
ab5f5e8b | 776 | audit_info->secid); |
2518c7c2 DM |
777 | xfrm_policy_kill(pol); |
778 | ||
779 | write_lock_bh(&xfrm_policy_lock); | |
780 | goto again2; | |
781 | } | |
1da177e4 | 782 | } |
2518c7c2 | 783 | |
1da177e4 | 784 | } |
2f1eb65f JHS |
785 | if (!cnt) |
786 | err = -ESRCH; | |
4aa2e62c | 787 | out: |
1da177e4 | 788 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 789 | return err; |
1da177e4 LT |
790 | } |
791 | EXPORT_SYMBOL(xfrm_policy_flush); | |
792 | ||
cdcbca7c | 793 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 794 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
795 | void *data) |
796 | { | |
12a169e7 HX |
797 | struct xfrm_policy *pol; |
798 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
799 | int error = 0; |
800 | ||
801 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
802 | walk->type != XFRM_POLICY_TYPE_ANY) | |
803 | return -EINVAL; | |
1da177e4 | 804 | |
12a169e7 | 805 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
806 | return 0; |
807 | ||
12a169e7 HX |
808 | write_lock_bh(&xfrm_policy_lock); |
809 | if (list_empty(&walk->walk.all)) | |
cdcbca7c | 810 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
811 | else |
812 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 813 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 814 | if (x->dead) |
4c563f76 | 815 | continue; |
12a169e7 HX |
816 | pol = container_of(x, struct xfrm_policy, walk); |
817 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
818 | walk->type != pol->type) | |
819 | continue; | |
820 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
821 | walk->seq, data); | |
822 | if (error) { | |
823 | list_move_tail(&walk->walk.all, &x->all); | |
824 | goto out; | |
2518c7c2 | 825 | } |
12a169e7 | 826 | walk->seq++; |
1da177e4 | 827 | } |
12a169e7 | 828 | if (walk->seq == 0) { |
baf5d743 JHS |
829 | error = -ENOENT; |
830 | goto out; | |
831 | } | |
12a169e7 | 832 | list_del_init(&walk->walk.all); |
1da177e4 | 833 | out: |
12a169e7 | 834 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
835 | return error; |
836 | } | |
837 | EXPORT_SYMBOL(xfrm_policy_walk); | |
838 | ||
12a169e7 HX |
839 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
840 | { | |
841 | INIT_LIST_HEAD(&walk->walk.all); | |
842 | walk->walk.dead = 1; | |
843 | walk->type = type; | |
844 | walk->seq = 0; | |
845 | } | |
846 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
847 | ||
848 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
849 | { | |
850 | if (list_empty(&walk->walk.all)) | |
851 | return; | |
852 | ||
853 | write_lock_bh(&xfrm_policy_lock); | |
854 | list_del(&walk->walk.all); | |
855 | write_unlock_bh(&xfrm_policy_lock); | |
856 | } | |
857 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
858 | ||
134b0fc5 JM |
859 | /* |
860 | * Find policy to apply to this flow. | |
861 | * | |
862 | * Returns 0 if policy found, else an -errno. | |
863 | */ | |
2518c7c2 DM |
864 | static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl, |
865 | u8 type, u16 family, int dir) | |
1da177e4 | 866 | { |
2518c7c2 | 867 | struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 868 | int match, ret = -ESRCH; |
1da177e4 | 869 | |
2518c7c2 | 870 | if (pol->family != family || |
34f8d884 | 871 | (fl->mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 872 | pol->type != type) |
134b0fc5 | 873 | return ret; |
1da177e4 | 874 | |
2518c7c2 | 875 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 876 | if (match) |
03e1ad7b PM |
877 | ret = security_xfrm_policy_lookup(pol->security, fl->secid, |
878 | dir); | |
2518c7c2 | 879 | |
134b0fc5 | 880 | return ret; |
2518c7c2 | 881 | } |
1da177e4 | 882 | |
52479b62 AD |
883 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
884 | struct flowi *fl, | |
2518c7c2 DM |
885 | u16 family, u8 dir) |
886 | { | |
134b0fc5 | 887 | int err; |
2518c7c2 DM |
888 | struct xfrm_policy *pol, *ret; |
889 | xfrm_address_t *daddr, *saddr; | |
890 | struct hlist_node *entry; | |
891 | struct hlist_head *chain; | |
acba48e1 | 892 | u32 priority = ~0U; |
df71837d | 893 | |
2518c7c2 DM |
894 | daddr = xfrm_flowi_daddr(fl, family); |
895 | saddr = xfrm_flowi_saddr(fl, family); | |
896 | if (unlikely(!daddr || !saddr)) | |
897 | return NULL; | |
898 | ||
899 | read_lock_bh(&xfrm_policy_lock); | |
52479b62 | 900 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 DM |
901 | ret = NULL; |
902 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
903 | err = xfrm_policy_match(pol, fl, type, family, dir); |
904 | if (err) { | |
905 | if (err == -ESRCH) | |
906 | continue; | |
907 | else { | |
908 | ret = ERR_PTR(err); | |
909 | goto fail; | |
910 | } | |
911 | } else { | |
2518c7c2 | 912 | ret = pol; |
acba48e1 | 913 | priority = ret->priority; |
2518c7c2 DM |
914 | break; |
915 | } | |
916 | } | |
52479b62 | 917 | chain = &net->xfrm.policy_inexact[dir]; |
acba48e1 | 918 | hlist_for_each_entry(pol, entry, chain, bydst) { |
134b0fc5 JM |
919 | err = xfrm_policy_match(pol, fl, type, family, dir); |
920 | if (err) { | |
921 | if (err == -ESRCH) | |
922 | continue; | |
923 | else { | |
924 | ret = ERR_PTR(err); | |
925 | goto fail; | |
926 | } | |
927 | } else if (pol->priority < priority) { | |
acba48e1 DM |
928 | ret = pol; |
929 | break; | |
1da177e4 LT |
930 | } |
931 | } | |
acba48e1 DM |
932 | if (ret) |
933 | xfrm_pol_hold(ret); | |
134b0fc5 | 934 | fail: |
1da177e4 | 935 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 936 | |
2518c7c2 | 937 | return ret; |
4e81bb83 MN |
938 | } |
939 | ||
80c802f3 TT |
940 | static struct xfrm_policy * |
941 | __xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir) | |
942 | { | |
943 | #ifdef CONFIG_XFRM_SUB_POLICY | |
944 | struct xfrm_policy *pol; | |
945 | ||
946 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
947 | if (pol != NULL) | |
948 | return pol; | |
949 | #endif | |
950 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
951 | } | |
952 | ||
fe1a5f03 TT |
953 | static struct flow_cache_object * |
954 | xfrm_policy_lookup(struct net *net, struct flowi *fl, u16 family, | |
955 | u8 dir, struct flow_cache_object *old_obj, void *ctx) | |
4e81bb83 MN |
956 | { |
957 | struct xfrm_policy *pol; | |
fe1a5f03 TT |
958 | |
959 | if (old_obj) | |
960 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); | |
4e81bb83 | 961 | |
80c802f3 TT |
962 | pol = __xfrm_policy_lookup(net, fl, family, dir); |
963 | if (IS_ERR_OR_NULL(pol)) | |
fe1a5f03 | 964 | return ERR_CAST(pol); |
fe1a5f03 | 965 | |
fe1a5f03 TT |
966 | /* Resolver returns two references: |
967 | * one for cache and one for caller of flow_cache_lookup() */ | |
968 | xfrm_pol_hold(pol); | |
969 | ||
970 | return &pol->flo; | |
1da177e4 LT |
971 | } |
972 | ||
df71837d TJ |
973 | static inline int policy_to_flow_dir(int dir) |
974 | { | |
975 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
976 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
977 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
978 | return dir; | |
979 | switch (dir) { | |
980 | default: | |
981 | case XFRM_POLICY_IN: | |
982 | return FLOW_DIR_IN; | |
983 | case XFRM_POLICY_OUT: | |
984 | return FLOW_DIR_OUT; | |
985 | case XFRM_POLICY_FWD: | |
986 | return FLOW_DIR_FWD; | |
3ff50b79 | 987 | } |
df71837d TJ |
988 | } |
989 | ||
e0d1caa7 | 990 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl) |
1da177e4 LT |
991 | { |
992 | struct xfrm_policy *pol; | |
993 | ||
994 | read_lock_bh(&xfrm_policy_lock); | |
995 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 996 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 997 | sk->sk_family); |
a716c119 | 998 | int err = 0; |
df71837d | 999 | |
3bccfbc7 | 1000 | if (match) { |
34f8d884 JHS |
1001 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1002 | pol = NULL; | |
1003 | goto out; | |
1004 | } | |
03e1ad7b PM |
1005 | err = security_xfrm_policy_lookup(pol->security, |
1006 | fl->secid, | |
1007 | policy_to_flow_dir(dir)); | |
3bccfbc7 VY |
1008 | if (!err) |
1009 | xfrm_pol_hold(pol); | |
1010 | else if (err == -ESRCH) | |
1011 | pol = NULL; | |
1012 | else | |
1013 | pol = ERR_PTR(err); | |
1014 | } else | |
1da177e4 LT |
1015 | pol = NULL; |
1016 | } | |
34f8d884 | 1017 | out: |
1da177e4 LT |
1018 | read_unlock_bh(&xfrm_policy_lock); |
1019 | return pol; | |
1020 | } | |
1021 | ||
1022 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1023 | { | |
98806f75 | 1024 | struct net *net = xp_net(pol); |
1121994c | 1025 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1026 | pol->family, dir); |
4e81bb83 | 1027 | |
98806f75 | 1028 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1029 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1030 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1031 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1032 | xfrm_pol_hold(pol); |
2518c7c2 | 1033 | |
98806f75 AD |
1034 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1035 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1036 | } |
1037 | ||
1038 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1039 | int dir) | |
1040 | { | |
98806f75 AD |
1041 | struct net *net = xp_net(pol); |
1042 | ||
2518c7c2 DM |
1043 | if (hlist_unhashed(&pol->bydst)) |
1044 | return NULL; | |
1da177e4 | 1045 | |
2518c7c2 DM |
1046 | hlist_del(&pol->bydst); |
1047 | hlist_del(&pol->byidx); | |
12a169e7 | 1048 | list_del(&pol->walk.all); |
98806f75 | 1049 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1050 | |
1051 | return pol; | |
1da177e4 LT |
1052 | } |
1053 | ||
4666faab | 1054 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1055 | { |
1056 | write_lock_bh(&xfrm_policy_lock); | |
1057 | pol = __xfrm_policy_unlink(pol, dir); | |
1058 | write_unlock_bh(&xfrm_policy_lock); | |
1059 | if (pol) { | |
1da177e4 | 1060 | xfrm_policy_kill(pol); |
4666faab | 1061 | return 0; |
1da177e4 | 1062 | } |
4666faab | 1063 | return -ENOENT; |
1da177e4 | 1064 | } |
a70fcb0b | 1065 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1066 | |
1067 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1068 | { | |
1121994c | 1069 | struct net *net = xp_net(pol); |
1da177e4 LT |
1070 | struct xfrm_policy *old_pol; |
1071 | ||
4e81bb83 MN |
1072 | #ifdef CONFIG_XFRM_SUB_POLICY |
1073 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1074 | return -EINVAL; | |
1075 | #endif | |
1076 | ||
1da177e4 LT |
1077 | write_lock_bh(&xfrm_policy_lock); |
1078 | old_pol = sk->sk_policy[dir]; | |
1079 | sk->sk_policy[dir] = pol; | |
1080 | if (pol) { | |
9d729f72 | 1081 | pol->curlft.add_time = get_seconds(); |
1121994c | 1082 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1083 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1084 | } | |
1085 | if (old_pol) | |
ea2dea9d TT |
1086 | /* Unlinking succeeds always. This is the only function |
1087 | * allowed to delete or replace socket policy. | |
1088 | */ | |
1da177e4 LT |
1089 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
1090 | write_unlock_bh(&xfrm_policy_lock); | |
1091 | ||
1092 | if (old_pol) { | |
1093 | xfrm_policy_kill(old_pol); | |
1094 | } | |
1095 | return 0; | |
1096 | } | |
1097 | ||
1098 | static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir) | |
1099 | { | |
0331b1f3 | 1100 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1101 | |
1102 | if (newp) { | |
1103 | newp->selector = old->selector; | |
03e1ad7b PM |
1104 | if (security_xfrm_policy_clone(old->security, |
1105 | &newp->security)) { | |
df71837d TJ |
1106 | kfree(newp); |
1107 | return NULL; /* ENOMEM */ | |
1108 | } | |
1da177e4 LT |
1109 | newp->lft = old->lft; |
1110 | newp->curlft = old->curlft; | |
fb977e2c | 1111 | newp->mark = old->mark; |
1da177e4 LT |
1112 | newp->action = old->action; |
1113 | newp->flags = old->flags; | |
1114 | newp->xfrm_nr = old->xfrm_nr; | |
1115 | newp->index = old->index; | |
4e81bb83 | 1116 | newp->type = old->type; |
1da177e4 LT |
1117 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1118 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1119 | write_lock_bh(&xfrm_policy_lock); | |
1120 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1121 | write_unlock_bh(&xfrm_policy_lock); | |
1122 | xfrm_pol_put(newp); | |
1123 | } | |
1124 | return newp; | |
1125 | } | |
1126 | ||
1127 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1128 | { | |
1129 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1130 | *p1 = sk->sk_policy[1]; | |
1131 | ||
1132 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1133 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1134 | return -ENOMEM; | |
1135 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1136 | return -ENOMEM; | |
1137 | return 0; | |
1138 | } | |
1139 | ||
a1e59abf | 1140 | static int |
fbda33b2 | 1141 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1142 | unsigned short family) |
1143 | { | |
1144 | int err; | |
1145 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1146 | ||
1147 | if (unlikely(afinfo == NULL)) | |
1148 | return -EINVAL; | |
fbda33b2 | 1149 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1150 | xfrm_policy_put_afinfo(afinfo); |
1151 | return err; | |
1152 | } | |
1153 | ||
1da177e4 LT |
1154 | /* Resolve list of templates for the flow, given policy. */ |
1155 | ||
1156 | static int | |
4e81bb83 MN |
1157 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl, |
1158 | struct xfrm_state **xfrm, | |
1159 | unsigned short family) | |
1da177e4 | 1160 | { |
fbda33b2 | 1161 | struct net *net = xp_net(policy); |
1da177e4 LT |
1162 | int nx; |
1163 | int i, error; | |
1164 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1165 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1166 | xfrm_address_t tmp; |
1da177e4 LT |
1167 | |
1168 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1169 | struct xfrm_state *x; | |
1170 | xfrm_address_t *remote = daddr; | |
1171 | xfrm_address_t *local = saddr; | |
1172 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1173 | ||
48b8d783 JK |
1174 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1175 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1176 | remote = &tmpl->id.daddr; |
1177 | local = &tmpl->saddr; | |
8444cf71 TE |
1178 | if (xfrm_addr_any(local, tmpl->encap_family)) { |
1179 | error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family); | |
a1e59abf PM |
1180 | if (error) |
1181 | goto fail; | |
1182 | local = &tmp; | |
1183 | } | |
1da177e4 LT |
1184 | } |
1185 | ||
1186 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1187 | ||
1188 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1189 | xfrm[nx++] = x; | |
1190 | daddr = remote; | |
1191 | saddr = local; | |
1192 | continue; | |
1193 | } | |
1194 | if (x) { | |
1195 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1196 | -EINVAL : -EAGAIN); | |
1197 | xfrm_state_put(x); | |
1198 | } | |
a4322266 | 1199 | else if (error == -ESRCH) |
1200 | error = -EAGAIN; | |
1da177e4 LT |
1201 | |
1202 | if (!tmpl->optional) | |
1203 | goto fail; | |
1204 | } | |
1205 | return nx; | |
1206 | ||
1207 | fail: | |
1208 | for (nx--; nx>=0; nx--) | |
1209 | xfrm_state_put(xfrm[nx]); | |
1210 | return error; | |
1211 | } | |
1212 | ||
4e81bb83 MN |
1213 | static int |
1214 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl, | |
1215 | struct xfrm_state **xfrm, | |
1216 | unsigned short family) | |
1217 | { | |
41a49cc3 MN |
1218 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1219 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1220 | int cnx = 0; |
1221 | int error; | |
1222 | int ret; | |
1223 | int i; | |
1224 | ||
1225 | for (i = 0; i < npols; i++) { | |
1226 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1227 | error = -ENOBUFS; | |
1228 | goto fail; | |
1229 | } | |
41a49cc3 MN |
1230 | |
1231 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1232 | if (ret < 0) { |
1233 | error = ret; | |
1234 | goto fail; | |
1235 | } else | |
1236 | cnx += ret; | |
1237 | } | |
1238 | ||
41a49cc3 MN |
1239 | /* found states are sorted for outbound processing */ |
1240 | if (npols > 1) | |
1241 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1242 | ||
4e81bb83 MN |
1243 | return cnx; |
1244 | ||
1245 | fail: | |
1246 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1247 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1248 | return error; |
1249 | ||
1250 | } | |
1251 | ||
1da177e4 LT |
1252 | /* Check that the bundle accepts the flow and its components are |
1253 | * still valid. | |
1254 | */ | |
1255 | ||
25ee3286 HX |
1256 | static inline int xfrm_get_tos(struct flowi *fl, int family) |
1257 | { | |
1258 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1259 | int tos; | |
1da177e4 | 1260 | |
25ee3286 HX |
1261 | if (!afinfo) |
1262 | return -EINVAL; | |
1263 | ||
1264 | tos = afinfo->get_tos(fl); | |
1265 | ||
1266 | xfrm_policy_put_afinfo(afinfo); | |
1267 | ||
1268 | return tos; | |
1269 | } | |
1270 | ||
80c802f3 TT |
1271 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
1272 | { | |
1273 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1274 | struct dst_entry *dst = &xdst->u.dst; | |
1275 | ||
1276 | if (xdst->route == NULL) { | |
1277 | /* Dummy bundle - if it has xfrms we were not | |
1278 | * able to build bundle as template resolution failed. | |
1279 | * It means we need to try again resolving. */ | |
1280 | if (xdst->num_xfrms > 0) | |
1281 | return NULL; | |
1282 | } else { | |
1283 | /* Real bundle */ | |
1284 | if (stale_bundle(dst)) | |
1285 | return NULL; | |
1286 | } | |
1287 | ||
1288 | dst_hold(dst); | |
1289 | return flo; | |
1290 | } | |
1291 | ||
1292 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) | |
1293 | { | |
1294 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1295 | struct dst_entry *dst = &xdst->u.dst; | |
1296 | ||
1297 | if (!xdst->route) | |
1298 | return 0; | |
1299 | if (stale_bundle(dst)) | |
1300 | return 0; | |
1301 | ||
1302 | return 1; | |
1303 | } | |
1304 | ||
1305 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) | |
1306 | { | |
1307 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1308 | struct dst_entry *dst = &xdst->u.dst; | |
1309 | ||
1310 | dst_free(dst); | |
1311 | } | |
1312 | ||
1313 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { | |
1314 | .get = xfrm_bundle_flo_get, | |
1315 | .check = xfrm_bundle_flo_check, | |
1316 | .delete = xfrm_bundle_flo_delete, | |
1317 | }; | |
1318 | ||
d7c7544c | 1319 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1320 | { |
1da177e4 | 1321 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1322 | struct dst_ops *dst_ops; |
25ee3286 HX |
1323 | struct xfrm_dst *xdst; |
1324 | ||
1325 | if (!afinfo) | |
1326 | return ERR_PTR(-EINVAL); | |
1327 | ||
d7c7544c AD |
1328 | switch (family) { |
1329 | case AF_INET: | |
1330 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1331 | break; | |
1332 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1333 | case AF_INET6: | |
1334 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1335 | break; | |
1336 | #endif | |
1337 | default: | |
1338 | BUG(); | |
1339 | } | |
1340 | xdst = dst_alloc(dst_ops) ?: ERR_PTR(-ENOBUFS); | |
25ee3286 HX |
1341 | xfrm_policy_put_afinfo(afinfo); |
1342 | ||
80c802f3 TT |
1343 | xdst->flo.ops = &xfrm_bundle_fc_ops; |
1344 | ||
25ee3286 HX |
1345 | return xdst; |
1346 | } | |
1347 | ||
a1b05140 MN |
1348 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1349 | int nfheader_len) | |
1350 | { | |
1351 | struct xfrm_policy_afinfo *afinfo = | |
1352 | xfrm_policy_get_afinfo(dst->ops->family); | |
1353 | int err; | |
1354 | ||
1355 | if (!afinfo) | |
1356 | return -EINVAL; | |
1357 | ||
1358 | err = afinfo->init_path(path, dst, nfheader_len); | |
1359 | ||
1360 | xfrm_policy_put_afinfo(afinfo); | |
1361 | ||
1362 | return err; | |
1363 | } | |
1364 | ||
87c1e12b HX |
1365 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
1366 | struct flowi *fl) | |
25ee3286 HX |
1367 | { |
1368 | struct xfrm_policy_afinfo *afinfo = | |
1369 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1370 | int err; | |
1371 | ||
1372 | if (!afinfo) | |
1da177e4 | 1373 | return -EINVAL; |
25ee3286 | 1374 | |
87c1e12b | 1375 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1376 | |
1da177e4 | 1377 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1378 | |
1da177e4 LT |
1379 | return err; |
1380 | } | |
1381 | ||
80c802f3 | 1382 | |
25ee3286 HX |
1383 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1384 | * all the metrics... Shortly, bundle a bundle. | |
1385 | */ | |
1386 | ||
1387 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1388 | struct xfrm_state **xfrm, int nx, | |
1389 | struct flowi *fl, | |
1390 | struct dst_entry *dst) | |
1391 | { | |
d7c7544c | 1392 | struct net *net = xp_net(policy); |
25ee3286 HX |
1393 | unsigned long now = jiffies; |
1394 | struct net_device *dev; | |
1395 | struct dst_entry *dst_prev = NULL; | |
1396 | struct dst_entry *dst0 = NULL; | |
1397 | int i = 0; | |
1398 | int err; | |
1399 | int header_len = 0; | |
a1b05140 | 1400 | int nfheader_len = 0; |
25ee3286 HX |
1401 | int trailer_len = 0; |
1402 | int tos; | |
1403 | int family = policy->selector.family; | |
9bb182a7 YH |
1404 | xfrm_address_t saddr, daddr; |
1405 | ||
1406 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1407 | |
1408 | tos = xfrm_get_tos(fl, family); | |
1409 | err = tos; | |
1410 | if (tos < 0) | |
1411 | goto put_states; | |
1412 | ||
1413 | dst_hold(dst); | |
1414 | ||
1415 | for (; i < nx; i++) { | |
d7c7544c | 1416 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1417 | struct dst_entry *dst1 = &xdst->u.dst; |
1418 | ||
1419 | err = PTR_ERR(xdst); | |
1420 | if (IS_ERR(xdst)) { | |
1421 | dst_release(dst); | |
1422 | goto put_states; | |
1423 | } | |
1424 | ||
1425 | if (!dst_prev) | |
1426 | dst0 = dst1; | |
1427 | else { | |
1428 | dst_prev->child = dst_clone(dst1); | |
1429 | dst1->flags |= DST_NOHASH; | |
1430 | } | |
1431 | ||
1432 | xdst->route = dst; | |
1433 | memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics)); | |
1434 | ||
1435 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1436 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1437 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1438 | family); | |
25ee3286 HX |
1439 | err = PTR_ERR(dst); |
1440 | if (IS_ERR(dst)) | |
1441 | goto put_states; | |
1442 | } else | |
1443 | dst_hold(dst); | |
1444 | ||
1445 | dst1->xfrm = xfrm[i]; | |
80c802f3 | 1446 | xdst->xfrm_genid = xfrm[i]->genid; |
25ee3286 HX |
1447 | |
1448 | dst1->obsolete = -1; | |
1449 | dst1->flags |= DST_HOST; | |
1450 | dst1->lastuse = now; | |
1451 | ||
1452 | dst1->input = dst_discard; | |
1453 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1454 | ||
1455 | dst1->next = dst_prev; | |
1456 | dst_prev = dst1; | |
1457 | ||
1458 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1459 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1460 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1461 | trailer_len += xfrm[i]->props.trailer_len; |
1462 | } | |
1463 | ||
1464 | dst_prev->child = dst; | |
1465 | dst0->path = dst; | |
1466 | ||
1467 | err = -ENODEV; | |
1468 | dev = dst->dev; | |
1469 | if (!dev) | |
1470 | goto free_dst; | |
1471 | ||
96c53401 | 1472 | /* Copy neighbour for reachability confirmation */ |
25ee3286 HX |
1473 | dst0->neighbour = neigh_clone(dst->neighbour); |
1474 | ||
a1b05140 | 1475 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1476 | xfrm_init_pmtu(dst_prev); |
1477 | ||
1478 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1479 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1480 | ||
87c1e12b | 1481 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1482 | if (err) |
1483 | goto free_dst; | |
1484 | ||
1485 | dst_prev->header_len = header_len; | |
1486 | dst_prev->trailer_len = trailer_len; | |
1487 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1488 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1489 | } | |
1490 | ||
1491 | out: | |
1492 | return dst0; | |
1493 | ||
1494 | put_states: | |
1495 | for (; i < nx; i++) | |
1496 | xfrm_state_put(xfrm[i]); | |
1497 | free_dst: | |
1498 | if (dst0) | |
1499 | dst_free(dst0); | |
1500 | dst0 = ERR_PTR(err); | |
1501 | goto out; | |
1502 | } | |
1503 | ||
157bfc25 MN |
1504 | static int inline |
1505 | xfrm_dst_alloc_copy(void **target, void *src, int size) | |
1506 | { | |
1507 | if (!*target) { | |
1508 | *target = kmalloc(size, GFP_ATOMIC); | |
1509 | if (!*target) | |
1510 | return -ENOMEM; | |
1511 | } | |
1512 | memcpy(*target, src, size); | |
1513 | return 0; | |
1514 | } | |
1515 | ||
1516 | static int inline | |
1517 | xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel) | |
1518 | { | |
1519 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1520 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1521 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1522 | sel, sizeof(*sel)); | |
1523 | #else | |
1524 | return 0; | |
1525 | #endif | |
1526 | } | |
1527 | ||
1528 | static int inline | |
1529 | xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl) | |
1530 | { | |
1531 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1532 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1533 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1534 | #else | |
1535 | return 0; | |
1536 | #endif | |
1537 | } | |
1da177e4 | 1538 | |
80c802f3 TT |
1539 | static int xfrm_expand_policies(struct flowi *fl, u16 family, |
1540 | struct xfrm_policy **pols, | |
1541 | int *num_pols, int *num_xfrms) | |
1542 | { | |
1543 | int i; | |
1544 | ||
1545 | if (*num_pols == 0 || !pols[0]) { | |
1546 | *num_pols = 0; | |
1547 | *num_xfrms = 0; | |
1548 | return 0; | |
1549 | } | |
1550 | if (IS_ERR(pols[0])) | |
1551 | return PTR_ERR(pols[0]); | |
1552 | ||
1553 | *num_xfrms = pols[0]->xfrm_nr; | |
1554 | ||
1555 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1556 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && | |
1557 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1558 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), | |
1559 | XFRM_POLICY_TYPE_MAIN, | |
1560 | fl, family, | |
1561 | XFRM_POLICY_OUT); | |
1562 | if (pols[1]) { | |
1563 | if (IS_ERR(pols[1])) { | |
1564 | xfrm_pols_put(pols, *num_pols); | |
1565 | return PTR_ERR(pols[1]); | |
1566 | } | |
1567 | (*num_pols) ++; | |
1568 | (*num_xfrms) += pols[1]->xfrm_nr; | |
1569 | } | |
1570 | } | |
1571 | #endif | |
1572 | for (i = 0; i < *num_pols; i++) { | |
1573 | if (pols[i]->action != XFRM_POLICY_ALLOW) { | |
1574 | *num_xfrms = -1; | |
1575 | break; | |
1576 | } | |
1577 | } | |
1578 | ||
1579 | return 0; | |
1580 | ||
1581 | } | |
1582 | ||
1583 | static struct xfrm_dst * | |
1584 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, | |
1585 | struct flowi *fl, u16 family, | |
1586 | struct dst_entry *dst_orig) | |
1587 | { | |
1588 | struct net *net = xp_net(pols[0]); | |
1589 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
1590 | struct dst_entry *dst; | |
1591 | struct xfrm_dst *xdst; | |
1592 | int err; | |
1593 | ||
1594 | /* Try to instantiate a bundle */ | |
1595 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); | |
d809ec89 TT |
1596 | if (err <= 0) { |
1597 | if (err != 0 && err != -EAGAIN) | |
80c802f3 TT |
1598 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
1599 | return ERR_PTR(err); | |
1600 | } | |
1601 | ||
1602 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); | |
1603 | if (IS_ERR(dst)) { | |
1604 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1605 | return ERR_CAST(dst); | |
1606 | } | |
1607 | ||
1608 | xdst = (struct xfrm_dst *)dst; | |
1609 | xdst->num_xfrms = err; | |
1610 | if (num_pols > 1) | |
1611 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1612 | else | |
1613 | err = xfrm_dst_update_origin(dst, fl); | |
1614 | if (unlikely(err)) { | |
1615 | dst_free(dst); | |
1616 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
1617 | return ERR_PTR(err); | |
1618 | } | |
1619 | ||
1620 | xdst->num_pols = num_pols; | |
1621 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1622 | xdst->policy_genid = atomic_read(&pols[0]->genid); | |
1623 | ||
1624 | return xdst; | |
1625 | } | |
1626 | ||
1627 | static struct flow_cache_object * | |
1628 | xfrm_bundle_lookup(struct net *net, struct flowi *fl, u16 family, u8 dir, | |
1629 | struct flow_cache_object *oldflo, void *ctx) | |
1630 | { | |
1631 | struct dst_entry *dst_orig = (struct dst_entry *)ctx; | |
1632 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; | |
1633 | struct xfrm_dst *xdst, *new_xdst; | |
1634 | int num_pols = 0, num_xfrms = 0, i, err, pol_dead; | |
1635 | ||
1636 | /* Check if the policies from old bundle are usable */ | |
1637 | xdst = NULL; | |
1638 | if (oldflo) { | |
1639 | xdst = container_of(oldflo, struct xfrm_dst, flo); | |
1640 | num_pols = xdst->num_pols; | |
1641 | num_xfrms = xdst->num_xfrms; | |
1642 | pol_dead = 0; | |
1643 | for (i = 0; i < num_pols; i++) { | |
1644 | pols[i] = xdst->pols[i]; | |
1645 | pol_dead |= pols[i]->walk.dead; | |
1646 | } | |
1647 | if (pol_dead) { | |
1648 | dst_free(&xdst->u.dst); | |
1649 | xdst = NULL; | |
1650 | num_pols = 0; | |
1651 | num_xfrms = 0; | |
1652 | oldflo = NULL; | |
1653 | } | |
1654 | } | |
1655 | ||
1656 | /* Resolve policies to use if we couldn't get them from | |
1657 | * previous cache entry */ | |
1658 | if (xdst == NULL) { | |
1659 | num_pols = 1; | |
1660 | pols[0] = __xfrm_policy_lookup(net, fl, family, dir); | |
1661 | err = xfrm_expand_policies(fl, family, pols, | |
1662 | &num_pols, &num_xfrms); | |
1663 | if (err < 0) | |
1664 | goto inc_error; | |
1665 | if (num_pols == 0) | |
1666 | return NULL; | |
1667 | if (num_xfrms <= 0) | |
1668 | goto make_dummy_bundle; | |
1669 | } | |
1670 | ||
1671 | new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig); | |
1672 | if (IS_ERR(new_xdst)) { | |
1673 | err = PTR_ERR(new_xdst); | |
1674 | if (err != -EAGAIN) | |
1675 | goto error; | |
1676 | if (oldflo == NULL) | |
1677 | goto make_dummy_bundle; | |
1678 | dst_hold(&xdst->u.dst); | |
1679 | return oldflo; | |
d809ec89 TT |
1680 | } else if (new_xdst == NULL) { |
1681 | num_xfrms = 0; | |
1682 | if (oldflo == NULL) | |
1683 | goto make_dummy_bundle; | |
1684 | xdst->num_xfrms = 0; | |
1685 | dst_hold(&xdst->u.dst); | |
1686 | return oldflo; | |
80c802f3 TT |
1687 | } |
1688 | ||
1689 | /* Kill the previous bundle */ | |
1690 | if (xdst) { | |
1691 | /* The policies were stolen for newly generated bundle */ | |
1692 | xdst->num_pols = 0; | |
1693 | dst_free(&xdst->u.dst); | |
1694 | } | |
1695 | ||
1696 | /* Flow cache does not have reference, it dst_free()'s, | |
1697 | * but we do need to return one reference for original caller */ | |
1698 | dst_hold(&new_xdst->u.dst); | |
1699 | return &new_xdst->flo; | |
1700 | ||
1701 | make_dummy_bundle: | |
1702 | /* We found policies, but there's no bundles to instantiate: | |
1703 | * either because the policy blocks, has no transformations or | |
1704 | * we could not build template (no xfrm_states).*/ | |
1705 | xdst = xfrm_alloc_dst(net, family); | |
1706 | if (IS_ERR(xdst)) { | |
1707 | xfrm_pols_put(pols, num_pols); | |
1708 | return ERR_CAST(xdst); | |
1709 | } | |
1710 | xdst->num_pols = num_pols; | |
1711 | xdst->num_xfrms = num_xfrms; | |
1712 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1713 | ||
1714 | dst_hold(&xdst->u.dst); | |
1715 | return &xdst->flo; | |
1716 | ||
1717 | inc_error: | |
1718 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
1719 | error: | |
1720 | if (xdst != NULL) | |
1721 | dst_free(&xdst->u.dst); | |
1722 | else | |
1723 | xfrm_pols_put(pols, num_pols); | |
1724 | return ERR_PTR(err); | |
1725 | } | |
1da177e4 LT |
1726 | |
1727 | /* Main function: finds/creates a bundle for given flow. | |
1728 | * | |
1729 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1730 | * on interfaces with disabled IPsec. | |
1731 | */ | |
52479b62 | 1732 | int __xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 | 1733 | struct sock *sk, int flags) |
1da177e4 | 1734 | { |
4e81bb83 | 1735 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
80c802f3 TT |
1736 | struct flow_cache_object *flo; |
1737 | struct xfrm_dst *xdst; | |
1738 | struct dst_entry *dst, *dst_orig = *dst_p, *route; | |
1739 | u16 family = dst_orig->ops->family; | |
df71837d | 1740 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
4b021628 | 1741 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
e0d1caa7 | 1742 | |
1da177e4 | 1743 | restart: |
80c802f3 TT |
1744 | dst = NULL; |
1745 | xdst = NULL; | |
1746 | route = NULL; | |
4e81bb83 | 1747 | |
f7944fb1 | 1748 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
80c802f3 TT |
1749 | num_pols = 1; |
1750 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); | |
1751 | err = xfrm_expand_policies(fl, family, pols, | |
1752 | &num_pols, &num_xfrms); | |
1753 | if (err < 0) | |
75b8c133 | 1754 | goto dropdst; |
80c802f3 TT |
1755 | |
1756 | if (num_pols) { | |
1757 | if (num_xfrms <= 0) { | |
1758 | drop_pols = num_pols; | |
1759 | goto no_transform; | |
1760 | } | |
1761 | ||
1762 | xdst = xfrm_resolve_and_create_bundle( | |
1763 | pols, num_pols, fl, | |
1764 | family, dst_orig); | |
1765 | if (IS_ERR(xdst)) { | |
1766 | xfrm_pols_put(pols, num_pols); | |
1767 | err = PTR_ERR(xdst); | |
1768 | goto dropdst; | |
d809ec89 TT |
1769 | } else if (xdst == NULL) { |
1770 | num_xfrms = 0; | |
1771 | drop_pols = num_pols; | |
1772 | goto no_transform; | |
80c802f3 TT |
1773 | } |
1774 | ||
1775 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); | |
1776 | xdst->u.dst.next = xfrm_policy_sk_bundles; | |
1777 | xfrm_policy_sk_bundles = &xdst->u.dst; | |
1778 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
1779 | ||
1780 | route = xdst->route; | |
0aa64774 | 1781 | } |
3bccfbc7 | 1782 | } |
1da177e4 | 1783 | |
80c802f3 | 1784 | if (xdst == NULL) { |
1da177e4 | 1785 | /* To accelerate a bit... */ |
2518c7c2 | 1786 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 1787 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 1788 | goto nopol; |
1da177e4 | 1789 | |
80c802f3 TT |
1790 | flo = flow_cache_lookup(net, fl, family, dir, |
1791 | xfrm_bundle_lookup, dst_orig); | |
1792 | if (flo == NULL) | |
1793 | goto nopol; | |
fe1a5f03 | 1794 | if (IS_ERR(flo)) { |
80c802f3 | 1795 | err = PTR_ERR(flo); |
75b8c133 | 1796 | goto dropdst; |
d66e37a9 | 1797 | } |
80c802f3 TT |
1798 | xdst = container_of(flo, struct xfrm_dst, flo); |
1799 | ||
1800 | num_pols = xdst->num_pols; | |
1801 | num_xfrms = xdst->num_xfrms; | |
1802 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols); | |
1803 | route = xdst->route; | |
1804 | } | |
1805 | ||
1806 | dst = &xdst->u.dst; | |
1807 | if (route == NULL && num_xfrms > 0) { | |
1808 | /* The only case when xfrm_bundle_lookup() returns a | |
1809 | * bundle with null route, is when the template could | |
1810 | * not be resolved. It means policies are there, but | |
1811 | * bundle could not be created, since we don't yet | |
1812 | * have the xfrm_state's. We need to wait for KM to | |
1813 | * negotiate new SA's or bail out with error.*/ | |
1814 | if (net->xfrm.sysctl_larval_drop) { | |
1815 | /* EREMOTE tells the caller to generate | |
1816 | * a one-shot blackhole route. */ | |
1817 | dst_release(dst); | |
a1aa3483 | 1818 | xfrm_pols_put(pols, drop_pols); |
80c802f3 TT |
1819 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
1820 | return -EREMOTE; | |
1821 | } | |
1822 | if (flags & XFRM_LOOKUP_WAIT) { | |
1823 | DECLARE_WAITQUEUE(wait, current); | |
1824 | ||
1825 | add_wait_queue(&net->xfrm.km_waitq, &wait); | |
1826 | set_current_state(TASK_INTERRUPTIBLE); | |
1827 | schedule(); | |
1828 | set_current_state(TASK_RUNNING); | |
1829 | remove_wait_queue(&net->xfrm.km_waitq, &wait); | |
1830 | ||
1831 | if (!signal_pending(current)) { | |
1832 | dst_release(dst); | |
1833 | goto restart; | |
1834 | } | |
1835 | ||
1836 | err = -ERESTART; | |
1837 | } else | |
1838 | err = -EAGAIN; | |
1839 | ||
1840 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
1841 | goto error; | |
1da177e4 LT |
1842 | } |
1843 | ||
80c802f3 TT |
1844 | no_transform: |
1845 | if (num_pols == 0) | |
8b7817f3 | 1846 | goto nopol; |
1da177e4 | 1847 | |
80c802f3 TT |
1848 | if ((flags & XFRM_LOOKUP_ICMP) && |
1849 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
1850 | err = -ENOENT; | |
8b7817f3 | 1851 | goto error; |
80c802f3 | 1852 | } |
8b7817f3 | 1853 | |
80c802f3 TT |
1854 | for (i = 0; i < num_pols; i++) |
1855 | pols[i]->curlft.use_time = get_seconds(); | |
8b7817f3 | 1856 | |
80c802f3 | 1857 | if (num_xfrms < 0) { |
1da177e4 | 1858 | /* Prohibit the flow */ |
59c9940e | 1859 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1860 | err = -EPERM; |
1861 | goto error; | |
80c802f3 TT |
1862 | } else if (num_xfrms > 0) { |
1863 | /* Flow transformed */ | |
1864 | *dst_p = dst; | |
1865 | dst_release(dst_orig); | |
1866 | } else { | |
1867 | /* Flow passes untransformed */ | |
1868 | dst_release(dst); | |
1da177e4 | 1869 | } |
80c802f3 TT |
1870 | ok: |
1871 | xfrm_pols_put(pols, drop_pols); | |
1da177e4 LT |
1872 | return 0; |
1873 | ||
80c802f3 TT |
1874 | nopol: |
1875 | if (!(flags & XFRM_LOOKUP_ICMP)) | |
1876 | goto ok; | |
1877 | err = -ENOENT; | |
1da177e4 | 1878 | error: |
80c802f3 | 1879 | dst_release(dst); |
75b8c133 HX |
1880 | dropdst: |
1881 | dst_release(dst_orig); | |
1da177e4 | 1882 | *dst_p = NULL; |
80c802f3 | 1883 | xfrm_pols_put(pols, drop_pols); |
1da177e4 LT |
1884 | return err; |
1885 | } | |
14e50e57 DM |
1886 | EXPORT_SYMBOL(__xfrm_lookup); |
1887 | ||
52479b62 | 1888 | int xfrm_lookup(struct net *net, struct dst_entry **dst_p, struct flowi *fl, |
14e50e57 DM |
1889 | struct sock *sk, int flags) |
1890 | { | |
52479b62 | 1891 | int err = __xfrm_lookup(net, dst_p, fl, sk, flags); |
14e50e57 DM |
1892 | |
1893 | if (err == -EREMOTE) { | |
1894 | dst_release(*dst_p); | |
1895 | *dst_p = NULL; | |
1896 | err = -EAGAIN; | |
1897 | } | |
1898 | ||
1899 | return err; | |
1900 | } | |
1da177e4 LT |
1901 | EXPORT_SYMBOL(xfrm_lookup); |
1902 | ||
df0ba92a MN |
1903 | static inline int |
1904 | xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl) | |
1905 | { | |
1906 | struct xfrm_state *x; | |
df0ba92a MN |
1907 | |
1908 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1909 | return 0; | |
1910 | x = skb->sp->xvec[idx]; | |
1911 | if (!x->type->reject) | |
1912 | return 0; | |
1ecafede | 1913 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1914 | } |
1915 | ||
1da177e4 LT |
1916 | /* When skb is transformed back to its "native" form, we have to |
1917 | * check policy restrictions. At the moment we make this in maximally | |
1918 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1919 | * have policy cached at them. | |
1920 | */ | |
1921 | ||
1922 | static inline int | |
a716c119 | 1923 | xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x, |
1da177e4 LT |
1924 | unsigned short family) |
1925 | { | |
1926 | if (xfrm_state_kern(x)) | |
928ba416 | 1927 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1928 | return x->id.proto == tmpl->id.proto && |
1929 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1930 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1931 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1932 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1933 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1934 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1935 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1936 | } |
1937 | ||
df0ba92a MN |
1938 | /* |
1939 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1940 | * because of optional transport mode, or next index of the mathced secpath | |
1941 | * state with the template. | |
1942 | * -1 is returned when no matching template is found. | |
1943 | * Otherwise "-2 - errored_index" is returned. | |
1944 | */ | |
1da177e4 LT |
1945 | static inline int |
1946 | xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start, | |
1947 | unsigned short family) | |
1948 | { | |
1949 | int idx = start; | |
1950 | ||
1951 | if (tmpl->optional) { | |
7e49e6de | 1952 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1953 | return start; |
1954 | } else | |
1955 | start = -1; | |
1956 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1957 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1958 | return ++idx; |
df0ba92a MN |
1959 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1960 | if (start == -1) | |
1961 | start = -2-idx; | |
1da177e4 | 1962 | break; |
df0ba92a | 1963 | } |
1da177e4 LT |
1964 | } |
1965 | return start; | |
1966 | } | |
1967 | ||
d5422efe HX |
1968 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1969 | unsigned int family, int reverse) | |
1da177e4 LT |
1970 | { |
1971 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1972 | int err; |
1da177e4 LT |
1973 | |
1974 | if (unlikely(afinfo == NULL)) | |
1975 | return -EAFNOSUPPORT; | |
1976 | ||
d5422efe | 1977 | afinfo->decode_session(skb, fl, reverse); |
beb8d13b | 1978 | err = security_xfrm_decode_session(skb, &fl->secid); |
1da177e4 | 1979 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 1980 | return err; |
1da177e4 | 1981 | } |
d5422efe | 1982 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 1983 | |
df0ba92a | 1984 | static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
1985 | { |
1986 | for (; k < sp->len; k++) { | |
df0ba92a | 1987 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 1988 | *idxp = k; |
1da177e4 | 1989 | return 1; |
df0ba92a | 1990 | } |
1da177e4 LT |
1991 | } |
1992 | ||
1993 | return 0; | |
1994 | } | |
1995 | ||
a716c119 | 1996 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
1997 | unsigned short family) |
1998 | { | |
f6e1e25d | 1999 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2000 | struct xfrm_policy *pol; |
4e81bb83 MN |
2001 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2002 | int npols = 0; | |
2003 | int xfrm_nr; | |
2004 | int pi; | |
d5422efe | 2005 | int reverse; |
1da177e4 | 2006 | struct flowi fl; |
d5422efe | 2007 | u8 fl_dir; |
df0ba92a | 2008 | int xerr_idx = -1; |
1da177e4 | 2009 | |
d5422efe HX |
2010 | reverse = dir & ~XFRM_POLICY_MASK; |
2011 | dir &= XFRM_POLICY_MASK; | |
2012 | fl_dir = policy_to_flow_dir(dir); | |
2013 | ||
0aa64774 | 2014 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 2015 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2016 | return 0; |
0aa64774 MN |
2017 | } |
2018 | ||
eb9c7ebe | 2019 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
2020 | |
2021 | /* First, check used SA against their selectors. */ | |
2022 | if (skb->sp) { | |
2023 | int i; | |
2024 | ||
2025 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 2026 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 2027 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 2028 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 2029 | return 0; |
0aa64774 | 2030 | } |
1da177e4 LT |
2031 | } |
2032 | } | |
2033 | ||
2034 | pol = NULL; | |
3bccfbc7 | 2035 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 2036 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 2037 | if (IS_ERR(pol)) { |
59c9940e | 2038 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 2039 | return 0; |
0aa64774 | 2040 | } |
3bccfbc7 | 2041 | } |
1da177e4 | 2042 | |
fe1a5f03 TT |
2043 | if (!pol) { |
2044 | struct flow_cache_object *flo; | |
2045 | ||
2046 | flo = flow_cache_lookup(net, &fl, family, fl_dir, | |
2047 | xfrm_policy_lookup, NULL); | |
2048 | if (IS_ERR_OR_NULL(flo)) | |
2049 | pol = ERR_CAST(flo); | |
2050 | else | |
2051 | pol = container_of(flo, struct xfrm_policy, flo); | |
2052 | } | |
1da177e4 | 2053 | |
0aa64774 | 2054 | if (IS_ERR(pol)) { |
59c9940e | 2055 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2056 | return 0; |
0aa64774 | 2057 | } |
134b0fc5 | 2058 | |
df0ba92a | 2059 | if (!pol) { |
d1d9facf | 2060 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 2061 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 2062 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
2063 | return 0; |
2064 | } | |
2065 | return 1; | |
2066 | } | |
1da177e4 | 2067 | |
9d729f72 | 2068 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 2069 | |
4e81bb83 MN |
2070 | pols[0] = pol; |
2071 | npols ++; | |
2072 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2073 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 2074 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
2075 | &fl, family, |
2076 | XFRM_POLICY_IN); | |
2077 | if (pols[1]) { | |
0aa64774 | 2078 | if (IS_ERR(pols[1])) { |
59c9940e | 2079 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2080 | return 0; |
0aa64774 | 2081 | } |
9d729f72 | 2082 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
2083 | npols ++; |
2084 | } | |
2085 | } | |
2086 | #endif | |
2087 | ||
1da177e4 LT |
2088 | if (pol->action == XFRM_POLICY_ALLOW) { |
2089 | struct sec_path *sp; | |
2090 | static struct sec_path dummy; | |
4e81bb83 | 2091 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 2092 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
2093 | struct xfrm_tmpl **tpp = tp; |
2094 | int ti = 0; | |
1da177e4 LT |
2095 | int i, k; |
2096 | ||
2097 | if ((sp = skb->sp) == NULL) | |
2098 | sp = &dummy; | |
2099 | ||
4e81bb83 MN |
2100 | for (pi = 0; pi < npols; pi++) { |
2101 | if (pols[pi] != pol && | |
0aa64774 | 2102 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2103 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2104 | goto reject; |
0aa64774 MN |
2105 | } |
2106 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2107 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2108 | goto reject_error; |
0aa64774 | 2109 | } |
4e81bb83 MN |
2110 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2111 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2112 | } | |
2113 | xfrm_nr = ti; | |
41a49cc3 MN |
2114 | if (npols > 1) { |
2115 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2116 | tpp = stp; | |
2117 | } | |
4e81bb83 | 2118 | |
1da177e4 LT |
2119 | /* For each tunnel xfrm, find the first matching tmpl. |
2120 | * For each tmpl before that, find corresponding xfrm. | |
2121 | * Order is _important_. Later we will implement | |
2122 | * some barriers, but at the moment barriers | |
2123 | * are implied between each two transformations. | |
2124 | */ | |
4e81bb83 MN |
2125 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2126 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2127 | if (k < 0) { |
d1d9facf JM |
2128 | if (k < -1) |
2129 | /* "-2 - errored_index" returned */ | |
2130 | xerr_idx = -(2+k); | |
59c9940e | 2131 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2132 | goto reject; |
df0ba92a | 2133 | } |
1da177e4 LT |
2134 | } |
2135 | ||
0aa64774 | 2136 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2137 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2138 | goto reject; |
0aa64774 | 2139 | } |
1da177e4 | 2140 | |
4e81bb83 | 2141 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2142 | return 1; |
2143 | } | |
59c9940e | 2144 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2145 | |
2146 | reject: | |
df0ba92a | 2147 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2148 | reject_error: |
2149 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2150 | return 0; |
2151 | } | |
2152 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2153 | ||
2154 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2155 | { | |
99a66657 | 2156 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2157 | struct flowi fl; |
adf30907 ED |
2158 | struct dst_entry *dst; |
2159 | int res; | |
1da177e4 | 2160 | |
0aa64774 | 2161 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2162 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2163 | return 0; |
0aa64774 | 2164 | } |
1da177e4 | 2165 | |
fafeeb6c | 2166 | skb_dst_force(skb); |
adf30907 ED |
2167 | dst = skb_dst(skb); |
2168 | ||
2169 | res = xfrm_lookup(net, &dst, &fl, NULL, 0) == 0; | |
2170 | skb_dst_set(skb, dst); | |
2171 | return res; | |
1da177e4 LT |
2172 | } |
2173 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2174 | ||
d49c73c7 DM |
2175 | /* Optimize later using cookies and generation ids. */ |
2176 | ||
1da177e4 LT |
2177 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2178 | { | |
d49c73c7 DM |
2179 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2180 | * to "-1" to force all XFRM destinations to get validated by | |
2181 | * dst_ops->check on every use. We do this because when a | |
2182 | * normal route referenced by an XFRM dst is obsoleted we do | |
2183 | * not go looking around for all parent referencing XFRM dsts | |
2184 | * so that we can invalidate them. It is just too much work. | |
2185 | * Instead we make the checks here on every use. For example: | |
2186 | * | |
2187 | * XFRM dst A --> IPv4 dst X | |
2188 | * | |
2189 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2190 | * in this example). If X is marked obsolete, "A" will not | |
2191 | * notice. That's what we are validating here via the | |
2192 | * stale_bundle() check. | |
2193 | * | |
2194 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2195 | * dst which causes it's ->obsolete field to be set to a | |
2196 | * positive non-zero integer. If an XFRM dst has been pruned | |
2197 | * like this, we want to force a new route lookup. | |
399c180a | 2198 | */ |
d49c73c7 DM |
2199 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2200 | return dst; | |
2201 | ||
1da177e4 LT |
2202 | return NULL; |
2203 | } | |
2204 | ||
2205 | static int stale_bundle(struct dst_entry *dst) | |
2206 | { | |
5b368e61 | 2207 | return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0); |
1da177e4 LT |
2208 | } |
2209 | ||
aabc9761 | 2210 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2211 | { |
1da177e4 | 2212 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2213 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2214 | dev_hold(dst->dev); |
1da177e4 LT |
2215 | dev_put(dev); |
2216 | } | |
2217 | } | |
aabc9761 | 2218 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2219 | |
2220 | static void xfrm_link_failure(struct sk_buff *skb) | |
2221 | { | |
2222 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1da177e4 LT |
2223 | } |
2224 | ||
2225 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2226 | { | |
2227 | if (dst) { | |
2228 | if (dst->obsolete) { | |
2229 | dst_release(dst); | |
2230 | dst = NULL; | |
2231 | } | |
2232 | } | |
2233 | return dst; | |
2234 | } | |
2235 | ||
80c802f3 | 2236 | static void __xfrm_garbage_collect(struct net *net) |
1da177e4 | 2237 | { |
80c802f3 | 2238 | struct dst_entry *head, *next; |
1da177e4 | 2239 | |
80c802f3 | 2240 | flow_cache_flush(); |
4e81bb83 | 2241 | |
80c802f3 TT |
2242 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
2243 | head = xfrm_policy_sk_bundles; | |
2244 | xfrm_policy_sk_bundles = NULL; | |
2245 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
2518c7c2 | 2246 | |
80c802f3 TT |
2247 | while (head) { |
2248 | next = head->next; | |
2249 | dst_free(head); | |
2250 | head = next; | |
1da177e4 LT |
2251 | } |
2252 | } | |
2253 | ||
25ee3286 | 2254 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2255 | { |
2256 | do { | |
2257 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2258 | u32 pmtu, route_mtu_cached; | |
2259 | ||
2260 | pmtu = dst_mtu(dst->child); | |
2261 | xdst->child_mtu_cached = pmtu; | |
2262 | ||
2263 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2264 | ||
2265 | route_mtu_cached = dst_mtu(xdst->route); | |
2266 | xdst->route_mtu_cached = route_mtu_cached; | |
2267 | ||
2268 | if (pmtu > route_mtu_cached) | |
2269 | pmtu = route_mtu_cached; | |
2270 | ||
2271 | dst->metrics[RTAX_MTU-1] = pmtu; | |
2272 | } while ((dst = dst->next)); | |
2273 | } | |
2274 | ||
1da177e4 LT |
2275 | /* Check that the bundle accepts the flow and its components are |
2276 | * still valid. | |
2277 | */ | |
2278 | ||
5b368e61 VY |
2279 | int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, |
2280 | struct flowi *fl, int family, int strict) | |
1da177e4 LT |
2281 | { |
2282 | struct dst_entry *dst = &first->u.dst; | |
2283 | struct xfrm_dst *last; | |
2284 | u32 mtu; | |
2285 | ||
92d63dec | 2286 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2287 | (dst->dev && !netif_running(dst->dev))) |
2288 | return 0; | |
157bfc25 MN |
2289 | #ifdef CONFIG_XFRM_SUB_POLICY |
2290 | if (fl) { | |
2291 | if (first->origin && !flow_cache_uli_match(first->origin, fl)) | |
2292 | return 0; | |
2293 | if (first->partner && | |
2294 | !xfrm_selector_match(first->partner, fl, family)) | |
2295 | return 0; | |
2296 | } | |
2297 | #endif | |
1da177e4 LT |
2298 | |
2299 | last = NULL; | |
2300 | ||
2301 | do { | |
2302 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2303 | ||
2304 | if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family)) | |
2305 | return 0; | |
67f83cbf VY |
2306 | if (fl && pol && |
2307 | !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl)) | |
e0d1caa7 | 2308 | return 0; |
1da177e4 LT |
2309 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2310 | return 0; | |
80c802f3 TT |
2311 | if (xdst->xfrm_genid != dst->xfrm->genid) |
2312 | return 0; | |
b1312c89 TT |
2313 | if (xdst->num_pols > 0 && |
2314 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
9d4a706d | 2315 | return 0; |
e53820de | 2316 | |
1bfcb10f | 2317 | if (strict && fl && |
13996378 | 2318 | !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) && |
e53820de MN |
2319 | !xfrm_state_addr_flow_check(dst->xfrm, fl, family)) |
2320 | return 0; | |
1da177e4 LT |
2321 | |
2322 | mtu = dst_mtu(dst->child); | |
2323 | if (xdst->child_mtu_cached != mtu) { | |
2324 | last = xdst; | |
2325 | xdst->child_mtu_cached = mtu; | |
2326 | } | |
2327 | ||
92d63dec | 2328 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2329 | return 0; |
2330 | mtu = dst_mtu(xdst->route); | |
2331 | if (xdst->route_mtu_cached != mtu) { | |
2332 | last = xdst; | |
2333 | xdst->route_mtu_cached = mtu; | |
2334 | } | |
2335 | ||
2336 | dst = dst->child; | |
2337 | } while (dst->xfrm); | |
2338 | ||
2339 | if (likely(!last)) | |
2340 | return 1; | |
2341 | ||
2342 | mtu = last->child_mtu_cached; | |
2343 | for (;;) { | |
2344 | dst = &last->u.dst; | |
2345 | ||
2346 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2347 | if (mtu > last->route_mtu_cached) | |
2348 | mtu = last->route_mtu_cached; | |
2349 | dst->metrics[RTAX_MTU-1] = mtu; | |
2350 | ||
2351 | if (last == first) | |
2352 | break; | |
2353 | ||
bd0bf076 | 2354 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2355 | last->child_mtu_cached = mtu; |
2356 | } | |
2357 | ||
2358 | return 1; | |
2359 | } | |
2360 | ||
2361 | EXPORT_SYMBOL(xfrm_bundle_ok); | |
2362 | ||
1da177e4 LT |
2363 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2364 | { | |
d7c7544c | 2365 | struct net *net; |
1da177e4 LT |
2366 | int err = 0; |
2367 | if (unlikely(afinfo == NULL)) | |
2368 | return -EINVAL; | |
2369 | if (unlikely(afinfo->family >= NPROTO)) | |
2370 | return -EAFNOSUPPORT; | |
e959d812 | 2371 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2372 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2373 | err = -ENOBUFS; | |
2374 | else { | |
2375 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2376 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2377 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2378 | if (likely(dst_ops->check == NULL)) | |
2379 | dst_ops->check = xfrm_dst_check; | |
1da177e4 LT |
2380 | if (likely(dst_ops->negative_advice == NULL)) |
2381 | dst_ops->negative_advice = xfrm_negative_advice; | |
2382 | if (likely(dst_ops->link_failure == NULL)) | |
2383 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2384 | if (likely(afinfo->garbage_collect == NULL)) |
2385 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2386 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2387 | } | |
e959d812 | 2388 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2389 | |
2390 | rtnl_lock(); | |
2391 | for_each_net(net) { | |
2392 | struct dst_ops *xfrm_dst_ops; | |
2393 | ||
2394 | switch (afinfo->family) { | |
2395 | case AF_INET: | |
2396 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2397 | break; | |
2398 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2399 | case AF_INET6: | |
2400 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2401 | break; | |
2402 | #endif | |
2403 | default: | |
2404 | BUG(); | |
2405 | } | |
2406 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2407 | } | |
2408 | rtnl_unlock(); | |
2409 | ||
1da177e4 LT |
2410 | return err; |
2411 | } | |
2412 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2413 | ||
2414 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2415 | { | |
2416 | int err = 0; | |
2417 | if (unlikely(afinfo == NULL)) | |
2418 | return -EINVAL; | |
2419 | if (unlikely(afinfo->family >= NPROTO)) | |
2420 | return -EAFNOSUPPORT; | |
e959d812 | 2421 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2422 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2423 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2424 | err = -EINVAL; | |
2425 | else { | |
2426 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2427 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2428 | dst_ops->kmem_cachep = NULL; | |
2429 | dst_ops->check = NULL; | |
1da177e4 LT |
2430 | dst_ops->negative_advice = NULL; |
2431 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2432 | afinfo->garbage_collect = NULL; |
2433 | } | |
2434 | } | |
e959d812 | 2435 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2436 | return err; |
2437 | } | |
2438 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2439 | ||
d7c7544c AD |
2440 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2441 | { | |
2442 | struct xfrm_policy_afinfo *afinfo; | |
2443 | ||
2444 | read_lock_bh(&xfrm_policy_afinfo_lock); | |
2445 | afinfo = xfrm_policy_afinfo[AF_INET]; | |
2446 | if (afinfo) | |
2447 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
2448 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2449 | afinfo = xfrm_policy_afinfo[AF_INET6]; | |
2450 | if (afinfo) | |
2451 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2452 | #endif | |
2453 | read_unlock_bh(&xfrm_policy_afinfo_lock); | |
2454 | } | |
2455 | ||
1da177e4 LT |
2456 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
2457 | { | |
2458 | struct xfrm_policy_afinfo *afinfo; | |
2459 | if (unlikely(family >= NPROTO)) | |
2460 | return NULL; | |
2461 | read_lock(&xfrm_policy_afinfo_lock); | |
2462 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2463 | if (unlikely(!afinfo)) |
2464 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2465 | return afinfo; |
2466 | } | |
2467 | ||
2468 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2469 | { | |
546be240 HX |
2470 | read_unlock(&xfrm_policy_afinfo_lock); |
2471 | } | |
2472 | ||
1da177e4 LT |
2473 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2474 | { | |
e9dc8653 EB |
2475 | struct net_device *dev = ptr; |
2476 | ||
1da177e4 LT |
2477 | switch (event) { |
2478 | case NETDEV_DOWN: | |
80c802f3 | 2479 | __xfrm_garbage_collect(dev_net(dev)); |
1da177e4 LT |
2480 | } |
2481 | return NOTIFY_DONE; | |
2482 | } | |
2483 | ||
2484 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2485 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2486 | }; |
2487 | ||
558f82ef | 2488 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2489 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2490 | { |
c68cd1a0 AD |
2491 | int rv; |
2492 | ||
7d720c3e | 2493 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
1823e4c8 ED |
2494 | sizeof(struct linux_xfrm_mib), |
2495 | __alignof__(struct linux_xfrm_mib)) < 0) | |
558f82ef | 2496 | return -ENOMEM; |
c68cd1a0 AD |
2497 | rv = xfrm_proc_init(net); |
2498 | if (rv < 0) | |
7d720c3e | 2499 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
c68cd1a0 | 2500 | return rv; |
558f82ef | 2501 | } |
59c9940e AD |
2502 | |
2503 | static void xfrm_statistics_fini(struct net *net) | |
2504 | { | |
c68cd1a0 | 2505 | xfrm_proc_fini(net); |
7d720c3e | 2506 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
59c9940e AD |
2507 | } |
2508 | #else | |
2509 | static int __net_init xfrm_statistics_init(struct net *net) | |
2510 | { | |
2511 | return 0; | |
2512 | } | |
2513 | ||
2514 | static void xfrm_statistics_fini(struct net *net) | |
2515 | { | |
2516 | } | |
558f82ef MN |
2517 | #endif |
2518 | ||
d62ddc21 | 2519 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2520 | { |
2518c7c2 DM |
2521 | unsigned int hmask, sz; |
2522 | int dir; | |
2523 | ||
d62ddc21 AD |
2524 | if (net_eq(net, &init_net)) |
2525 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2526 | sizeof(struct xfrm_dst), |
e5d679f3 | 2527 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2528 | NULL); |
1da177e4 | 2529 | |
2518c7c2 DM |
2530 | hmask = 8 - 1; |
2531 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2532 | ||
93b851c1 AD |
2533 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2534 | if (!net->xfrm.policy_byidx) | |
2535 | goto out_byidx; | |
8100bea7 | 2536 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2537 | |
2538 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2539 | struct xfrm_policy_hash *htab; | |
2540 | ||
dc2caba7 | 2541 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2542 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2543 | |
a35f6c5d | 2544 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2545 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2546 | if (!htab->table) |
a35f6c5d AD |
2547 | goto out_bydst; |
2548 | htab->hmask = hmask; | |
2518c7c2 DM |
2549 | } |
2550 | ||
adfcf0b2 | 2551 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2552 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2553 | if (net_eq(net, &init_net)) |
2554 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2555 | return 0; | |
93b851c1 | 2556 | |
a35f6c5d AD |
2557 | out_bydst: |
2558 | for (dir--; dir >= 0; dir--) { | |
2559 | struct xfrm_policy_hash *htab; | |
2560 | ||
2561 | htab = &net->xfrm.policy_bydst[dir]; | |
2562 | xfrm_hash_free(htab->table, sz); | |
2563 | } | |
2564 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2565 | out_byidx: |
2566 | return -ENOMEM; | |
d62ddc21 AD |
2567 | } |
2568 | ||
2569 | static void xfrm_policy_fini(struct net *net) | |
2570 | { | |
7c2776ee | 2571 | struct xfrm_audit audit_info; |
93b851c1 | 2572 | unsigned int sz; |
8b18f8ea | 2573 | int dir; |
93b851c1 | 2574 | |
7c2776ee AD |
2575 | flush_work(&net->xfrm.policy_hash_work); |
2576 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2577 | audit_info.loginuid = -1; | |
2578 | audit_info.sessionid = -1; | |
2579 | audit_info.secid = 0; | |
2580 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2581 | #endif | |
2582 | audit_info.loginuid = -1; | |
2583 | audit_info.sessionid = -1; | |
2584 | audit_info.secid = 0; | |
2585 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
7c2776ee | 2586 | |
adfcf0b2 | 2587 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2588 | |
8b18f8ea | 2589 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2590 | struct xfrm_policy_hash *htab; |
2591 | ||
8b18f8ea | 2592 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2593 | |
2594 | htab = &net->xfrm.policy_bydst[dir]; | |
2595 | sz = (htab->hmask + 1); | |
2596 | WARN_ON(!hlist_empty(htab->table)); | |
2597 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2598 | } |
2599 | ||
8100bea7 | 2600 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2601 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2602 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2603 | } |
2604 | ||
d62ddc21 AD |
2605 | static int __net_init xfrm_net_init(struct net *net) |
2606 | { | |
2607 | int rv; | |
2608 | ||
59c9940e AD |
2609 | rv = xfrm_statistics_init(net); |
2610 | if (rv < 0) | |
2611 | goto out_statistics; | |
d62ddc21 AD |
2612 | rv = xfrm_state_init(net); |
2613 | if (rv < 0) | |
2614 | goto out_state; | |
2615 | rv = xfrm_policy_init(net); | |
2616 | if (rv < 0) | |
2617 | goto out_policy; | |
d7c7544c | 2618 | xfrm_dst_ops_init(net); |
b27aeadb AD |
2619 | rv = xfrm_sysctl_init(net); |
2620 | if (rv < 0) | |
2621 | goto out_sysctl; | |
d62ddc21 AD |
2622 | return 0; |
2623 | ||
b27aeadb AD |
2624 | out_sysctl: |
2625 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2626 | out_policy: |
2627 | xfrm_state_fini(net); | |
2628 | out_state: | |
59c9940e AD |
2629 | xfrm_statistics_fini(net); |
2630 | out_statistics: | |
d62ddc21 AD |
2631 | return rv; |
2632 | } | |
2633 | ||
2634 | static void __net_exit xfrm_net_exit(struct net *net) | |
2635 | { | |
b27aeadb | 2636 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2637 | xfrm_policy_fini(net); |
2638 | xfrm_state_fini(net); | |
59c9940e | 2639 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2640 | } |
2641 | ||
2642 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2643 | .init = xfrm_net_init, | |
2644 | .exit = xfrm_net_exit, | |
2645 | }; | |
2646 | ||
1da177e4 LT |
2647 | void __init xfrm_init(void) |
2648 | { | |
d62ddc21 | 2649 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
2650 | xfrm_input_init(); |
2651 | } | |
2652 | ||
ab5f5e8b | 2653 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2654 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2655 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2656 | { |
875179fa PM |
2657 | struct xfrm_sec_ctx *ctx = xp->security; |
2658 | struct xfrm_selector *sel = &xp->selector; | |
2659 | ||
2660 | if (ctx) | |
ab5f5e8b | 2661 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2662 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2663 | |
875179fa | 2664 | switch(sel->family) { |
ab5f5e8b | 2665 | case AF_INET: |
21454aaa | 2666 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2667 | if (sel->prefixlen_s != 32) |
2668 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2669 | sel->prefixlen_s); | |
21454aaa | 2670 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2671 | if (sel->prefixlen_d != 32) |
2672 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2673 | sel->prefixlen_d); | |
ab5f5e8b JL |
2674 | break; |
2675 | case AF_INET6: | |
5b095d98 | 2676 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2677 | if (sel->prefixlen_s != 128) |
2678 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2679 | sel->prefixlen_s); | |
5b095d98 | 2680 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2681 | if (sel->prefixlen_d != 128) |
2682 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2683 | sel->prefixlen_d); | |
ab5f5e8b JL |
2684 | break; |
2685 | } | |
2686 | } | |
2687 | ||
68277acc | 2688 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2689 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2690 | { |
2691 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2692 | |
afeb14b4 | 2693 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2694 | if (audit_buf == NULL) |
2695 | return; | |
2532386f | 2696 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2697 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2698 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2699 | audit_log_end(audit_buf); | |
2700 | } | |
2701 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2702 | ||
68277acc | 2703 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2704 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2705 | { |
2706 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2707 | |
afeb14b4 | 2708 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2709 | if (audit_buf == NULL) |
2710 | return; | |
2532386f | 2711 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2712 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2713 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2714 | audit_log_end(audit_buf); | |
2715 | } | |
2716 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2717 | #endif | |
2718 | ||
80c9abaa SS |
2719 | #ifdef CONFIG_XFRM_MIGRATE |
2720 | static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp, | |
2721 | struct xfrm_selector *sel_tgt) | |
2722 | { | |
2723 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2724 | if (sel_tgt->family == sel_cmp->family && | |
2725 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2726 | sel_cmp->family) == 0 && |
80c9abaa SS |
2727 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2728 | sel_cmp->family) == 0 && | |
2729 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2730 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2731 | return 1; | |
2732 | } | |
2733 | } else { | |
2734 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2735 | return 1; | |
2736 | } | |
2737 | } | |
2738 | return 0; | |
2739 | } | |
2740 | ||
2741 | static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel, | |
2742 | u8 dir, u8 type) | |
2743 | { | |
2744 | struct xfrm_policy *pol, *ret = NULL; | |
2745 | struct hlist_node *entry; | |
2746 | struct hlist_head *chain; | |
2747 | u32 priority = ~0U; | |
2748 | ||
2749 | read_lock_bh(&xfrm_policy_lock); | |
1121994c | 2750 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
80c9abaa SS |
2751 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2752 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2753 | pol->type == type) { | |
2754 | ret = pol; | |
2755 | priority = ret->priority; | |
2756 | break; | |
2757 | } | |
2758 | } | |
8b18f8ea | 2759 | chain = &init_net.xfrm.policy_inexact[dir]; |
80c9abaa SS |
2760 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2761 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2762 | pol->type == type && | |
2763 | pol->priority < priority) { | |
2764 | ret = pol; | |
2765 | break; | |
2766 | } | |
2767 | } | |
2768 | ||
2769 | if (ret) | |
2770 | xfrm_pol_hold(ret); | |
2771 | ||
2772 | read_unlock_bh(&xfrm_policy_lock); | |
2773 | ||
2774 | return ret; | |
2775 | } | |
2776 | ||
2777 | static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t) | |
2778 | { | |
2779 | int match = 0; | |
2780 | ||
2781 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2782 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2783 | switch (t->mode) { | |
2784 | case XFRM_MODE_TUNNEL: | |
2785 | case XFRM_MODE_BEET: | |
2786 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2787 | m->old_family) == 0 && | |
2788 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2789 | m->old_family) == 0) { | |
2790 | match = 1; | |
2791 | } | |
2792 | break; | |
2793 | case XFRM_MODE_TRANSPORT: | |
2794 | /* in case of transport mode, template does not store | |
2795 | any IP addresses, hence we just compare mode and | |
2796 | protocol */ | |
2797 | match = 1; | |
2798 | break; | |
2799 | default: | |
2800 | break; | |
2801 | } | |
2802 | } | |
2803 | return match; | |
2804 | } | |
2805 | ||
2806 | /* update endpoint address(es) of template(s) */ | |
2807 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2808 | struct xfrm_migrate *m, int num_migrate) | |
2809 | { | |
2810 | struct xfrm_migrate *mp; | |
80c9abaa SS |
2811 | int i, j, n = 0; |
2812 | ||
2813 | write_lock_bh(&pol->lock); | |
12a169e7 | 2814 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2815 | /* target policy has been deleted */ |
2816 | write_unlock_bh(&pol->lock); | |
2817 | return -ENOENT; | |
2818 | } | |
2819 | ||
2820 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2821 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2822 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2823 | continue; | |
2824 | n++; | |
1bfcb10f HX |
2825 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2826 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2827 | continue; |
2828 | /* update endpoints */ | |
2829 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2830 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2831 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2832 | sizeof(pol->xfrm_vec[i].saddr)); | |
2833 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2834 | /* flush bundles */ | |
80c802f3 | 2835 | atomic_inc(&pol->genid); |
80c9abaa SS |
2836 | } |
2837 | } | |
2838 | ||
2839 | write_unlock_bh(&pol->lock); | |
2840 | ||
2841 | if (!n) | |
2842 | return -ENODATA; | |
2843 | ||
2844 | return 0; | |
2845 | } | |
2846 | ||
2847 | static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate) | |
2848 | { | |
2849 | int i, j; | |
2850 | ||
2851 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2852 | return -EINVAL; | |
2853 | ||
2854 | for (i = 0; i < num_migrate; i++) { | |
2855 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2856 | m[i].old_family) == 0) && | |
2857 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2858 | m[i].old_family) == 0)) | |
2859 | return -EINVAL; | |
2860 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2861 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2862 | return -EINVAL; | |
2863 | ||
2864 | /* check if there is any duplicated entry */ | |
2865 | for (j = i + 1; j < num_migrate; j++) { | |
2866 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2867 | sizeof(m[i].old_daddr)) && | |
2868 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2869 | sizeof(m[i].old_saddr)) && | |
2870 | m[i].proto == m[j].proto && | |
2871 | m[i].mode == m[j].mode && | |
2872 | m[i].reqid == m[j].reqid && | |
2873 | m[i].old_family == m[j].old_family) | |
2874 | return -EINVAL; | |
2875 | } | |
2876 | } | |
2877 | ||
2878 | return 0; | |
2879 | } | |
2880 | ||
2881 | int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, | |
13c1d189 AE |
2882 | struct xfrm_migrate *m, int num_migrate, |
2883 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2884 | { |
2885 | int i, err, nx_cur = 0, nx_new = 0; | |
2886 | struct xfrm_policy *pol = NULL; | |
2887 | struct xfrm_state *x, *xc; | |
2888 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2889 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2890 | struct xfrm_migrate *mp; | |
2891 | ||
2892 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2893 | goto out; | |
2894 | ||
2895 | /* Stage 1 - find policy */ | |
2896 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2897 | err = -ENOENT; | |
2898 | goto out; | |
2899 | } | |
2900 | ||
2901 | /* Stage 2 - find and update state(s) */ | |
2902 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2903 | if ((x = xfrm_migrate_state_find(mp))) { | |
2904 | x_cur[nx_cur] = x; | |
2905 | nx_cur++; | |
2906 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2907 | x_new[nx_new] = xc; | |
2908 | nx_new++; | |
2909 | } else { | |
2910 | err = -ENODATA; | |
2911 | goto restore_state; | |
2912 | } | |
2913 | } | |
2914 | } | |
2915 | ||
2916 | /* Stage 3 - update policy */ | |
2917 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2918 | goto restore_state; | |
2919 | ||
2920 | /* Stage 4 - delete old state(s) */ | |
2921 | if (nx_cur) { | |
2922 | xfrm_states_put(x_cur, nx_cur); | |
2923 | xfrm_states_delete(x_cur, nx_cur); | |
2924 | } | |
2925 | ||
2926 | /* Stage 5 - announce */ | |
13c1d189 | 2927 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2928 | |
2929 | xfrm_pol_put(pol); | |
2930 | ||
2931 | return 0; | |
2932 | out: | |
2933 | return err; | |
2934 | ||
2935 | restore_state: | |
2936 | if (pol) | |
2937 | xfrm_pol_put(pol); | |
2938 | if (nx_cur) | |
2939 | xfrm_states_put(x_cur, nx_cur); | |
2940 | if (nx_new) | |
2941 | xfrm_states_delete(x_new, nx_new); | |
2942 | ||
2943 | return err; | |
2944 | } | |
e610e679 | 2945 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2946 | #endif |