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); |
ca116922 | 53 | static int xfrm_bundle_ok(struct xfrm_dst *xdst, int family); |
1c4c40c4 | 54 | |
1da177e4 | 55 | |
29fa0b30 WY |
56 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, |
57 | int dir); | |
58 | ||
77681021 | 59 | static inline int |
200ce96e | 60 | __xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 61 | { |
7e1dc7b6 DM |
62 | const struct flowi4 *fl4 = &fl->u.ip4; |
63 | ||
64 | return addr_match(&fl4->daddr, &sel->daddr, sel->prefixlen_d) && | |
65 | addr_match(&fl4->saddr, &sel->saddr, sel->prefixlen_s) && | |
66 | !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) && | |
67 | !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) && | |
68 | (fl4->flowi4_proto == sel->proto || !sel->proto) && | |
69 | (fl4->flowi4_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
70 | } |
71 | ||
72 | static inline int | |
200ce96e | 73 | __xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) |
77681021 | 74 | { |
7e1dc7b6 DM |
75 | const struct flowi6 *fl6 = &fl->u.ip6; |
76 | ||
77 | return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) && | |
78 | addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) && | |
79 | !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) && | |
80 | !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) && | |
81 | (fl6->flowi6_proto == sel->proto || !sel->proto) && | |
82 | (fl6->flowi6_oif == sel->ifindex || !sel->ifindex); | |
77681021 AM |
83 | } |
84 | ||
200ce96e | 85 | int xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl, |
e1ad2ab2 | 86 | unsigned short family) |
77681021 AM |
87 | { |
88 | switch (family) { | |
89 | case AF_INET: | |
90 | return __xfrm4_selector_match(sel, fl); | |
91 | case AF_INET6: | |
92 | return __xfrm6_selector_match(sel, fl); | |
93 | } | |
94 | return 0; | |
95 | } | |
96 | ||
c5b3cf46 | 97 | static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, |
6418c4e0 DM |
98 | const xfrm_address_t *saddr, |
99 | const xfrm_address_t *daddr, | |
9bb182a7 YH |
100 | int family) |
101 | { | |
102 | struct xfrm_policy_afinfo *afinfo; | |
103 | struct dst_entry *dst; | |
104 | ||
105 | afinfo = xfrm_policy_get_afinfo(family); | |
106 | if (unlikely(afinfo == NULL)) | |
107 | return ERR_PTR(-EAFNOSUPPORT); | |
108 | ||
c5b3cf46 | 109 | dst = afinfo->dst_lookup(net, tos, saddr, daddr); |
9bb182a7 YH |
110 | |
111 | xfrm_policy_put_afinfo(afinfo); | |
112 | ||
113 | return dst; | |
114 | } | |
115 | ||
25ee3286 | 116 | static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, |
9bb182a7 YH |
117 | xfrm_address_t *prev_saddr, |
118 | xfrm_address_t *prev_daddr, | |
25ee3286 | 119 | int family) |
1da177e4 | 120 | { |
c5b3cf46 | 121 | struct net *net = xs_net(x); |
66cdb3ca HX |
122 | xfrm_address_t *saddr = &x->props.saddr; |
123 | xfrm_address_t *daddr = &x->id.daddr; | |
66cdb3ca HX |
124 | struct dst_entry *dst; |
125 | ||
9bb182a7 | 126 | if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { |
66cdb3ca | 127 | saddr = x->coaddr; |
9bb182a7 YH |
128 | daddr = prev_daddr; |
129 | } | |
130 | if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { | |
131 | saddr = prev_saddr; | |
66cdb3ca | 132 | daddr = x->coaddr; |
9bb182a7 | 133 | } |
1da177e4 | 134 | |
c5b3cf46 | 135 | dst = __xfrm_dst_lookup(net, tos, saddr, daddr, family); |
9bb182a7 YH |
136 | |
137 | if (!IS_ERR(dst)) { | |
138 | if (prev_saddr != saddr) | |
139 | memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); | |
140 | if (prev_daddr != daddr) | |
141 | memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); | |
142 | } | |
1da177e4 | 143 | |
66cdb3ca | 144 | return dst; |
1da177e4 | 145 | } |
1da177e4 | 146 | |
1da177e4 LT |
147 | static inline unsigned long make_jiffies(long secs) |
148 | { | |
149 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
150 | return MAX_SCHEDULE_TIMEOUT-1; | |
151 | else | |
a716c119 | 152 | return secs*HZ; |
1da177e4 LT |
153 | } |
154 | ||
155 | static void xfrm_policy_timer(unsigned long data) | |
156 | { | |
157 | struct xfrm_policy *xp = (struct xfrm_policy*)data; | |
9d729f72 | 158 | unsigned long now = get_seconds(); |
1da177e4 LT |
159 | long next = LONG_MAX; |
160 | int warn = 0; | |
161 | int dir; | |
162 | ||
163 | read_lock(&xp->lock); | |
164 | ||
ea2dea9d | 165 | if (unlikely(xp->walk.dead)) |
1da177e4 LT |
166 | goto out; |
167 | ||
77d8d7a6 | 168 | dir = xfrm_policy_id2dir(xp->index); |
1da177e4 LT |
169 | |
170 | if (xp->lft.hard_add_expires_seconds) { | |
171 | long tmo = xp->lft.hard_add_expires_seconds + | |
172 | xp->curlft.add_time - now; | |
173 | if (tmo <= 0) | |
174 | goto expired; | |
175 | if (tmo < next) | |
176 | next = tmo; | |
177 | } | |
178 | if (xp->lft.hard_use_expires_seconds) { | |
179 | long tmo = xp->lft.hard_use_expires_seconds + | |
180 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
181 | if (tmo <= 0) | |
182 | goto expired; | |
183 | if (tmo < next) | |
184 | next = tmo; | |
185 | } | |
186 | if (xp->lft.soft_add_expires_seconds) { | |
187 | long tmo = xp->lft.soft_add_expires_seconds + | |
188 | xp->curlft.add_time - now; | |
189 | if (tmo <= 0) { | |
190 | warn = 1; | |
191 | tmo = XFRM_KM_TIMEOUT; | |
192 | } | |
193 | if (tmo < next) | |
194 | next = tmo; | |
195 | } | |
196 | if (xp->lft.soft_use_expires_seconds) { | |
197 | long tmo = xp->lft.soft_use_expires_seconds + | |
198 | (xp->curlft.use_time ? : xp->curlft.add_time) - now; | |
199 | if (tmo <= 0) { | |
200 | warn = 1; | |
201 | tmo = XFRM_KM_TIMEOUT; | |
202 | } | |
203 | if (tmo < next) | |
204 | next = tmo; | |
205 | } | |
206 | ||
207 | if (warn) | |
6c5c8ca7 | 208 | km_policy_expired(xp, dir, 0, 0); |
1da177e4 LT |
209 | if (next != LONG_MAX && |
210 | !mod_timer(&xp->timer, jiffies + make_jiffies(next))) | |
211 | xfrm_pol_hold(xp); | |
212 | ||
213 | out: | |
214 | read_unlock(&xp->lock); | |
215 | xfrm_pol_put(xp); | |
216 | return; | |
217 | ||
218 | expired: | |
219 | read_unlock(&xp->lock); | |
4666faab | 220 | if (!xfrm_policy_delete(xp, dir)) |
6c5c8ca7 | 221 | km_policy_expired(xp, dir, 1, 0); |
1da177e4 LT |
222 | xfrm_pol_put(xp); |
223 | } | |
224 | ||
fe1a5f03 TT |
225 | static struct flow_cache_object *xfrm_policy_flo_get(struct flow_cache_object *flo) |
226 | { | |
227 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
228 | ||
229 | if (unlikely(pol->walk.dead)) | |
230 | flo = NULL; | |
231 | else | |
232 | xfrm_pol_hold(pol); | |
233 | ||
234 | return flo; | |
235 | } | |
236 | ||
237 | static int xfrm_policy_flo_check(struct flow_cache_object *flo) | |
238 | { | |
239 | struct xfrm_policy *pol = container_of(flo, struct xfrm_policy, flo); | |
240 | ||
241 | return !pol->walk.dead; | |
242 | } | |
243 | ||
244 | static void xfrm_policy_flo_delete(struct flow_cache_object *flo) | |
245 | { | |
246 | xfrm_pol_put(container_of(flo, struct xfrm_policy, flo)); | |
247 | } | |
248 | ||
249 | static const struct flow_cache_ops xfrm_policy_fc_ops = { | |
250 | .get = xfrm_policy_flo_get, | |
251 | .check = xfrm_policy_flo_check, | |
252 | .delete = xfrm_policy_flo_delete, | |
253 | }; | |
1da177e4 LT |
254 | |
255 | /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 | |
256 | * SPD calls. | |
257 | */ | |
258 | ||
0331b1f3 | 259 | struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) |
1da177e4 LT |
260 | { |
261 | struct xfrm_policy *policy; | |
262 | ||
0da974f4 | 263 | policy = kzalloc(sizeof(struct xfrm_policy), gfp); |
1da177e4 LT |
264 | |
265 | if (policy) { | |
0331b1f3 | 266 | write_pnet(&policy->xp_net, net); |
12a169e7 | 267 | INIT_LIST_HEAD(&policy->walk.all); |
2518c7c2 DM |
268 | INIT_HLIST_NODE(&policy->bydst); |
269 | INIT_HLIST_NODE(&policy->byidx); | |
1da177e4 | 270 | rwlock_init(&policy->lock); |
2518c7c2 | 271 | atomic_set(&policy->refcnt, 1); |
b24b8a24 PE |
272 | setup_timer(&policy->timer, xfrm_policy_timer, |
273 | (unsigned long)policy); | |
fe1a5f03 | 274 | policy->flo.ops = &xfrm_policy_fc_ops; |
1da177e4 LT |
275 | } |
276 | return policy; | |
277 | } | |
278 | EXPORT_SYMBOL(xfrm_policy_alloc); | |
279 | ||
280 | /* Destroy xfrm_policy: descendant resources must be released to this moment. */ | |
281 | ||
64c31b3f | 282 | void xfrm_policy_destroy(struct xfrm_policy *policy) |
1da177e4 | 283 | { |
12a169e7 | 284 | BUG_ON(!policy->walk.dead); |
1da177e4 | 285 | |
1da177e4 LT |
286 | if (del_timer(&policy->timer)) |
287 | BUG(); | |
288 | ||
03e1ad7b | 289 | security_xfrm_policy_free(policy->security); |
1da177e4 LT |
290 | kfree(policy); |
291 | } | |
64c31b3f | 292 | EXPORT_SYMBOL(xfrm_policy_destroy); |
1da177e4 | 293 | |
1da177e4 LT |
294 | /* Rule must be locked. Release descentant resources, announce |
295 | * entry dead. The rule must be unlinked from lists to the moment. | |
296 | */ | |
297 | ||
298 | static void xfrm_policy_kill(struct xfrm_policy *policy) | |
299 | { | |
12a169e7 | 300 | policy->walk.dead = 1; |
1da177e4 | 301 | |
285ead17 | 302 | atomic_inc(&policy->genid); |
1da177e4 | 303 | |
285ead17 TT |
304 | if (del_timer(&policy->timer)) |
305 | xfrm_pol_put(policy); | |
306 | ||
307 | xfrm_pol_put(policy); | |
1da177e4 LT |
308 | } |
309 | ||
2518c7c2 DM |
310 | static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; |
311 | ||
e92303f8 | 312 | static inline unsigned int idx_hash(struct net *net, u32 index) |
2518c7c2 | 313 | { |
e92303f8 | 314 | return __idx_hash(index, net->xfrm.policy_idx_hmask); |
2518c7c2 DM |
315 | } |
316 | ||
5f803b58 DM |
317 | static struct hlist_head *policy_hash_bysel(struct net *net, |
318 | const struct xfrm_selector *sel, | |
319 | unsigned short family, int dir) | |
2518c7c2 | 320 | { |
1121994c | 321 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
322 | unsigned int hash = __sel_hash(sel, family, hmask); |
323 | ||
324 | return (hash == hmask + 1 ? | |
1121994c AD |
325 | &net->xfrm.policy_inexact[dir] : |
326 | net->xfrm.policy_bydst[dir].table + hash); | |
2518c7c2 DM |
327 | } |
328 | ||
5f803b58 DM |
329 | static struct hlist_head *policy_hash_direct(struct net *net, |
330 | const xfrm_address_t *daddr, | |
331 | const xfrm_address_t *saddr, | |
332 | unsigned short family, int dir) | |
2518c7c2 | 333 | { |
1121994c | 334 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
335 | unsigned int hash = __addr_hash(daddr, saddr, family, hmask); |
336 | ||
1121994c | 337 | return net->xfrm.policy_bydst[dir].table + hash; |
2518c7c2 DM |
338 | } |
339 | ||
2518c7c2 DM |
340 | static void xfrm_dst_hash_transfer(struct hlist_head *list, |
341 | struct hlist_head *ndsttable, | |
342 | unsigned int nhashmask) | |
343 | { | |
b791160b | 344 | struct hlist_node *entry, *tmp, *entry0 = NULL; |
2518c7c2 | 345 | struct xfrm_policy *pol; |
b791160b | 346 | unsigned int h0 = 0; |
2518c7c2 | 347 | |
b791160b | 348 | redo: |
2518c7c2 DM |
349 | hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) { |
350 | unsigned int h; | |
351 | ||
352 | h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, | |
353 | pol->family, nhashmask); | |
b791160b YH |
354 | if (!entry0) { |
355 | hlist_del(entry); | |
356 | hlist_add_head(&pol->bydst, ndsttable+h); | |
357 | h0 = h; | |
358 | } else { | |
359 | if (h != h0) | |
360 | continue; | |
361 | hlist_del(entry); | |
362 | hlist_add_after(entry0, &pol->bydst); | |
363 | } | |
364 | entry0 = entry; | |
365 | } | |
366 | if (!hlist_empty(list)) { | |
367 | entry0 = NULL; | |
368 | goto redo; | |
2518c7c2 DM |
369 | } |
370 | } | |
371 | ||
372 | static void xfrm_idx_hash_transfer(struct hlist_head *list, | |
373 | struct hlist_head *nidxtable, | |
374 | unsigned int nhashmask) | |
375 | { | |
376 | struct hlist_node *entry, *tmp; | |
377 | struct xfrm_policy *pol; | |
378 | ||
379 | hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) { | |
380 | unsigned int h; | |
381 | ||
382 | h = __idx_hash(pol->index, nhashmask); | |
383 | hlist_add_head(&pol->byidx, nidxtable+h); | |
384 | } | |
385 | } | |
386 | ||
387 | static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) | |
388 | { | |
389 | return ((old_hmask + 1) << 1) - 1; | |
390 | } | |
391 | ||
66caf628 | 392 | static void xfrm_bydst_resize(struct net *net, int dir) |
2518c7c2 | 393 | { |
66caf628 | 394 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; |
2518c7c2 DM |
395 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
396 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 397 | struct hlist_head *odst = net->xfrm.policy_bydst[dir].table; |
44e36b42 | 398 | struct hlist_head *ndst = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
399 | int i; |
400 | ||
401 | if (!ndst) | |
402 | return; | |
403 | ||
404 | write_lock_bh(&xfrm_policy_lock); | |
405 | ||
406 | for (i = hmask; i >= 0; i--) | |
407 | xfrm_dst_hash_transfer(odst + i, ndst, nhashmask); | |
408 | ||
66caf628 AD |
409 | net->xfrm.policy_bydst[dir].table = ndst; |
410 | net->xfrm.policy_bydst[dir].hmask = nhashmask; | |
2518c7c2 DM |
411 | |
412 | write_unlock_bh(&xfrm_policy_lock); | |
413 | ||
44e36b42 | 414 | xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
415 | } |
416 | ||
66caf628 | 417 | static void xfrm_byidx_resize(struct net *net, int total) |
2518c7c2 | 418 | { |
66caf628 | 419 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
420 | unsigned int nhashmask = xfrm_new_hash_mask(hmask); |
421 | unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); | |
66caf628 | 422 | struct hlist_head *oidx = net->xfrm.policy_byidx; |
44e36b42 | 423 | struct hlist_head *nidx = xfrm_hash_alloc(nsize); |
2518c7c2 DM |
424 | int i; |
425 | ||
426 | if (!nidx) | |
427 | return; | |
428 | ||
429 | write_lock_bh(&xfrm_policy_lock); | |
430 | ||
431 | for (i = hmask; i >= 0; i--) | |
432 | xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); | |
433 | ||
66caf628 AD |
434 | net->xfrm.policy_byidx = nidx; |
435 | net->xfrm.policy_idx_hmask = nhashmask; | |
2518c7c2 DM |
436 | |
437 | write_unlock_bh(&xfrm_policy_lock); | |
438 | ||
44e36b42 | 439 | xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); |
2518c7c2 DM |
440 | } |
441 | ||
66caf628 | 442 | static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) |
2518c7c2 | 443 | { |
66caf628 AD |
444 | unsigned int cnt = net->xfrm.policy_count[dir]; |
445 | unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; | |
2518c7c2 DM |
446 | |
447 | if (total) | |
448 | *total += cnt; | |
449 | ||
450 | if ((hmask + 1) < xfrm_policy_hashmax && | |
451 | cnt > hmask) | |
452 | return 1; | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
66caf628 | 457 | static inline int xfrm_byidx_should_resize(struct net *net, int total) |
2518c7c2 | 458 | { |
66caf628 | 459 | unsigned int hmask = net->xfrm.policy_idx_hmask; |
2518c7c2 DM |
460 | |
461 | if ((hmask + 1) < xfrm_policy_hashmax && | |
462 | total > hmask) | |
463 | return 1; | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
e071041b | 468 | void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) |
ecfd6b18 JHS |
469 | { |
470 | read_lock_bh(&xfrm_policy_lock); | |
e071041b AD |
471 | si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; |
472 | si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; | |
473 | si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; | |
474 | si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; | |
475 | si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; | |
476 | si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; | |
477 | si->spdhcnt = net->xfrm.policy_idx_hmask; | |
ecfd6b18 JHS |
478 | si->spdhmcnt = xfrm_policy_hashmax; |
479 | read_unlock_bh(&xfrm_policy_lock); | |
480 | } | |
481 | EXPORT_SYMBOL(xfrm_spd_getinfo); | |
2518c7c2 | 482 | |
ecfd6b18 | 483 | static DEFINE_MUTEX(hash_resize_mutex); |
66caf628 | 484 | static void xfrm_hash_resize(struct work_struct *work) |
2518c7c2 | 485 | { |
66caf628 | 486 | struct net *net = container_of(work, struct net, xfrm.policy_hash_work); |
2518c7c2 DM |
487 | int dir, total; |
488 | ||
489 | mutex_lock(&hash_resize_mutex); | |
490 | ||
491 | total = 0; | |
492 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
66caf628 AD |
493 | if (xfrm_bydst_should_resize(net, dir, &total)) |
494 | xfrm_bydst_resize(net, dir); | |
2518c7c2 | 495 | } |
66caf628 AD |
496 | if (xfrm_byidx_should_resize(net, total)) |
497 | xfrm_byidx_resize(net, total); | |
2518c7c2 DM |
498 | |
499 | mutex_unlock(&hash_resize_mutex); | |
500 | } | |
501 | ||
1da177e4 LT |
502 | /* Generate new index... KAME seems to generate them ordered by cost |
503 | * of an absolute inpredictability of ordering of rules. This will not pass. */ | |
1121994c | 504 | static u32 xfrm_gen_index(struct net *net, int dir) |
1da177e4 | 505 | { |
1da177e4 LT |
506 | static u32 idx_generator; |
507 | ||
508 | for (;;) { | |
2518c7c2 DM |
509 | struct hlist_node *entry; |
510 | struct hlist_head *list; | |
511 | struct xfrm_policy *p; | |
512 | u32 idx; | |
513 | int found; | |
514 | ||
1da177e4 LT |
515 | idx = (idx_generator | dir); |
516 | idx_generator += 8; | |
517 | if (idx == 0) | |
518 | idx = 8; | |
1121994c | 519 | list = net->xfrm.policy_byidx + idx_hash(net, idx); |
2518c7c2 DM |
520 | found = 0; |
521 | hlist_for_each_entry(p, entry, list, byidx) { | |
522 | if (p->index == idx) { | |
523 | found = 1; | |
1da177e4 | 524 | break; |
2518c7c2 | 525 | } |
1da177e4 | 526 | } |
2518c7c2 | 527 | if (!found) |
1da177e4 LT |
528 | return idx; |
529 | } | |
530 | } | |
531 | ||
2518c7c2 DM |
532 | static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) |
533 | { | |
534 | u32 *p1 = (u32 *) s1; | |
535 | u32 *p2 = (u32 *) s2; | |
536 | int len = sizeof(struct xfrm_selector) / sizeof(u32); | |
537 | int i; | |
538 | ||
539 | for (i = 0; i < len; i++) { | |
540 | if (p1[i] != p2[i]) | |
541 | return 1; | |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
1da177e4 LT |
547 | int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) |
548 | { | |
1121994c | 549 | struct net *net = xp_net(policy); |
2518c7c2 DM |
550 | struct xfrm_policy *pol; |
551 | struct xfrm_policy *delpol; | |
552 | struct hlist_head *chain; | |
a6c7ab55 | 553 | struct hlist_node *entry, *newpos; |
34f8d884 | 554 | u32 mark = policy->mark.v & policy->mark.m; |
1da177e4 LT |
555 | |
556 | write_lock_bh(&xfrm_policy_lock); | |
1121994c | 557 | chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); |
2518c7c2 DM |
558 | delpol = NULL; |
559 | newpos = NULL; | |
2518c7c2 | 560 | hlist_for_each_entry(pol, entry, chain, bydst) { |
a6c7ab55 | 561 | if (pol->type == policy->type && |
2518c7c2 | 562 | !selector_cmp(&pol->selector, &policy->selector) && |
34f8d884 | 563 | (mark & pol->mark.m) == pol->mark.v && |
a6c7ab55 HX |
564 | xfrm_sec_ctx_match(pol->security, policy->security) && |
565 | !WARN_ON(delpol)) { | |
1da177e4 LT |
566 | if (excl) { |
567 | write_unlock_bh(&xfrm_policy_lock); | |
568 | return -EEXIST; | |
569 | } | |
1da177e4 LT |
570 | delpol = pol; |
571 | if (policy->priority > pol->priority) | |
572 | continue; | |
573 | } else if (policy->priority >= pol->priority) { | |
a6c7ab55 | 574 | newpos = &pol->bydst; |
1da177e4 LT |
575 | continue; |
576 | } | |
1da177e4 LT |
577 | if (delpol) |
578 | break; | |
1da177e4 LT |
579 | } |
580 | if (newpos) | |
2518c7c2 DM |
581 | hlist_add_after(newpos, &policy->bydst); |
582 | else | |
583 | hlist_add_head(&policy->bydst, chain); | |
1da177e4 | 584 | xfrm_pol_hold(policy); |
1121994c | 585 | net->xfrm.policy_count[dir]++; |
1da177e4 | 586 | atomic_inc(&flow_cache_genid); |
29fa0b30 WY |
587 | if (delpol) |
588 | __xfrm_policy_unlink(delpol, dir); | |
1121994c AD |
589 | policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir); |
590 | hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); | |
9d729f72 | 591 | policy->curlft.add_time = get_seconds(); |
1da177e4 LT |
592 | policy->curlft.use_time = 0; |
593 | if (!mod_timer(&policy->timer, jiffies + HZ)) | |
594 | xfrm_pol_hold(policy); | |
1121994c | 595 | list_add(&policy->walk.all, &net->xfrm.policy_all); |
1da177e4 LT |
596 | write_unlock_bh(&xfrm_policy_lock); |
597 | ||
9b78a82c | 598 | if (delpol) |
1da177e4 | 599 | xfrm_policy_kill(delpol); |
1121994c AD |
600 | else if (xfrm_bydst_should_resize(net, dir, NULL)) |
601 | schedule_work(&net->xfrm.policy_hash_work); | |
9b78a82c | 602 | |
1da177e4 LT |
603 | return 0; |
604 | } | |
605 | EXPORT_SYMBOL(xfrm_policy_insert); | |
606 | ||
8ca2e93b JHS |
607 | struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark, u8 type, |
608 | int dir, struct xfrm_selector *sel, | |
ef41aaa0 EP |
609 | struct xfrm_sec_ctx *ctx, int delete, |
610 | int *err) | |
1da177e4 | 611 | { |
2518c7c2 DM |
612 | struct xfrm_policy *pol, *ret; |
613 | struct hlist_head *chain; | |
614 | struct hlist_node *entry; | |
1da177e4 | 615 | |
ef41aaa0 | 616 | *err = 0; |
1da177e4 | 617 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 618 | chain = policy_hash_bysel(net, sel, sel->family, dir); |
2518c7c2 DM |
619 | ret = NULL; |
620 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
621 | if (pol->type == type && | |
34f8d884 | 622 | (mark & pol->mark.m) == pol->mark.v && |
2518c7c2 DM |
623 | !selector_cmp(sel, &pol->selector) && |
624 | xfrm_sec_ctx_match(ctx, pol->security)) { | |
1da177e4 | 625 | xfrm_pol_hold(pol); |
2518c7c2 | 626 | if (delete) { |
03e1ad7b PM |
627 | *err = security_xfrm_policy_delete( |
628 | pol->security); | |
ef41aaa0 EP |
629 | if (*err) { |
630 | write_unlock_bh(&xfrm_policy_lock); | |
631 | return pol; | |
632 | } | |
29fa0b30 | 633 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
634 | } |
635 | ret = pol; | |
1da177e4 LT |
636 | break; |
637 | } | |
638 | } | |
639 | write_unlock_bh(&xfrm_policy_lock); | |
640 | ||
fe1a5f03 | 641 | if (ret && delete) |
2518c7c2 | 642 | xfrm_policy_kill(ret); |
2518c7c2 | 643 | return ret; |
1da177e4 | 644 | } |
df71837d | 645 | EXPORT_SYMBOL(xfrm_policy_bysel_ctx); |
1da177e4 | 646 | |
8ca2e93b JHS |
647 | struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8 type, |
648 | int dir, u32 id, int delete, int *err) | |
1da177e4 | 649 | { |
2518c7c2 DM |
650 | struct xfrm_policy *pol, *ret; |
651 | struct hlist_head *chain; | |
652 | struct hlist_node *entry; | |
1da177e4 | 653 | |
b5505c6e HX |
654 | *err = -ENOENT; |
655 | if (xfrm_policy_id2dir(id) != dir) | |
656 | return NULL; | |
657 | ||
ef41aaa0 | 658 | *err = 0; |
1da177e4 | 659 | write_lock_bh(&xfrm_policy_lock); |
8d1211a6 | 660 | chain = net->xfrm.policy_byidx + idx_hash(net, id); |
2518c7c2 DM |
661 | ret = NULL; |
662 | hlist_for_each_entry(pol, entry, chain, byidx) { | |
34f8d884 JHS |
663 | if (pol->type == type && pol->index == id && |
664 | (mark & pol->mark.m) == pol->mark.v) { | |
1da177e4 | 665 | xfrm_pol_hold(pol); |
2518c7c2 | 666 | if (delete) { |
03e1ad7b PM |
667 | *err = security_xfrm_policy_delete( |
668 | pol->security); | |
ef41aaa0 EP |
669 | if (*err) { |
670 | write_unlock_bh(&xfrm_policy_lock); | |
671 | return pol; | |
672 | } | |
29fa0b30 | 673 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 DM |
674 | } |
675 | ret = pol; | |
1da177e4 LT |
676 | break; |
677 | } | |
678 | } | |
679 | write_unlock_bh(&xfrm_policy_lock); | |
680 | ||
fe1a5f03 | 681 | if (ret && delete) |
2518c7c2 | 682 | xfrm_policy_kill(ret); |
2518c7c2 | 683 | return ret; |
1da177e4 LT |
684 | } |
685 | EXPORT_SYMBOL(xfrm_policy_byid); | |
686 | ||
4aa2e62c JL |
687 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
688 | static inline int | |
33ffbbd5 | 689 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
1da177e4 | 690 | { |
4aa2e62c JL |
691 | int dir, err = 0; |
692 | ||
693 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { | |
694 | struct xfrm_policy *pol; | |
695 | struct hlist_node *entry; | |
696 | int i; | |
697 | ||
698 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 699 | &net->xfrm.policy_inexact[dir], bydst) { |
4aa2e62c JL |
700 | if (pol->type != type) |
701 | continue; | |
03e1ad7b | 702 | err = security_xfrm_policy_delete(pol->security); |
4aa2e62c | 703 | if (err) { |
ab5f5e8b JL |
704 | xfrm_audit_policy_delete(pol, 0, |
705 | audit_info->loginuid, | |
2532386f | 706 | audit_info->sessionid, |
ab5f5e8b | 707 | audit_info->secid); |
4aa2e62c JL |
708 | return err; |
709 | } | |
7dc12d6d | 710 | } |
33ffbbd5 | 711 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
4aa2e62c | 712 | hlist_for_each_entry(pol, entry, |
33ffbbd5 | 713 | net->xfrm.policy_bydst[dir].table + i, |
4aa2e62c JL |
714 | bydst) { |
715 | if (pol->type != type) | |
716 | continue; | |
03e1ad7b PM |
717 | err = security_xfrm_policy_delete( |
718 | pol->security); | |
4aa2e62c | 719 | if (err) { |
ab5f5e8b JL |
720 | xfrm_audit_policy_delete(pol, 0, |
721 | audit_info->loginuid, | |
2532386f | 722 | audit_info->sessionid, |
ab5f5e8b | 723 | audit_info->secid); |
4aa2e62c JL |
724 | return err; |
725 | } | |
726 | } | |
727 | } | |
728 | } | |
729 | return err; | |
730 | } | |
731 | #else | |
732 | static inline int | |
33ffbbd5 | 733 | xfrm_policy_flush_secctx_check(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c JL |
734 | { |
735 | return 0; | |
736 | } | |
737 | #endif | |
738 | ||
33ffbbd5 | 739 | int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info) |
4aa2e62c | 740 | { |
2f1eb65f | 741 | int dir, err = 0, cnt = 0; |
1da177e4 LT |
742 | |
743 | write_lock_bh(&xfrm_policy_lock); | |
4aa2e62c | 744 | |
33ffbbd5 | 745 | err = xfrm_policy_flush_secctx_check(net, type, audit_info); |
4aa2e62c JL |
746 | if (err) |
747 | goto out; | |
748 | ||
1da177e4 | 749 | for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { |
2518c7c2 DM |
750 | struct xfrm_policy *pol; |
751 | struct hlist_node *entry; | |
29fa0b30 | 752 | int i; |
2518c7c2 DM |
753 | |
754 | again1: | |
755 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 756 | &net->xfrm.policy_inexact[dir], bydst) { |
2518c7c2 DM |
757 | if (pol->type != type) |
758 | continue; | |
ea2dea9d | 759 | __xfrm_policy_unlink(pol, dir); |
1da177e4 | 760 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 761 | cnt++; |
1da177e4 | 762 | |
ab5f5e8b | 763 | xfrm_audit_policy_delete(pol, 1, audit_info->loginuid, |
2532386f | 764 | audit_info->sessionid, |
ab5f5e8b | 765 | audit_info->secid); |
161a09e7 | 766 | |
2518c7c2 | 767 | xfrm_policy_kill(pol); |
1da177e4 LT |
768 | |
769 | write_lock_bh(&xfrm_policy_lock); | |
2518c7c2 DM |
770 | goto again1; |
771 | } | |
772 | ||
33ffbbd5 | 773 | for (i = net->xfrm.policy_bydst[dir].hmask; i >= 0; i--) { |
2518c7c2 DM |
774 | again2: |
775 | hlist_for_each_entry(pol, entry, | |
33ffbbd5 | 776 | net->xfrm.policy_bydst[dir].table + i, |
2518c7c2 DM |
777 | bydst) { |
778 | if (pol->type != type) | |
779 | continue; | |
ea2dea9d | 780 | __xfrm_policy_unlink(pol, dir); |
2518c7c2 | 781 | write_unlock_bh(&xfrm_policy_lock); |
ea2dea9d | 782 | cnt++; |
2518c7c2 | 783 | |
ab5f5e8b JL |
784 | xfrm_audit_policy_delete(pol, 1, |
785 | audit_info->loginuid, | |
2532386f | 786 | audit_info->sessionid, |
ab5f5e8b | 787 | audit_info->secid); |
2518c7c2 DM |
788 | xfrm_policy_kill(pol); |
789 | ||
790 | write_lock_bh(&xfrm_policy_lock); | |
791 | goto again2; | |
792 | } | |
1da177e4 | 793 | } |
2518c7c2 | 794 | |
1da177e4 | 795 | } |
2f1eb65f JHS |
796 | if (!cnt) |
797 | err = -ESRCH; | |
4aa2e62c | 798 | out: |
1da177e4 | 799 | write_unlock_bh(&xfrm_policy_lock); |
4aa2e62c | 800 | return err; |
1da177e4 LT |
801 | } |
802 | EXPORT_SYMBOL(xfrm_policy_flush); | |
803 | ||
cdcbca7c | 804 | int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, |
4c563f76 | 805 | int (*func)(struct xfrm_policy *, int, int, void*), |
1da177e4 LT |
806 | void *data) |
807 | { | |
12a169e7 HX |
808 | struct xfrm_policy *pol; |
809 | struct xfrm_policy_walk_entry *x; | |
4c563f76 TT |
810 | int error = 0; |
811 | ||
812 | if (walk->type >= XFRM_POLICY_TYPE_MAX && | |
813 | walk->type != XFRM_POLICY_TYPE_ANY) | |
814 | return -EINVAL; | |
1da177e4 | 815 | |
12a169e7 | 816 | if (list_empty(&walk->walk.all) && walk->seq != 0) |
4c563f76 TT |
817 | return 0; |
818 | ||
12a169e7 HX |
819 | write_lock_bh(&xfrm_policy_lock); |
820 | if (list_empty(&walk->walk.all)) | |
cdcbca7c | 821 | x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); |
12a169e7 HX |
822 | else |
823 | x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); | |
cdcbca7c | 824 | list_for_each_entry_from(x, &net->xfrm.policy_all, all) { |
12a169e7 | 825 | if (x->dead) |
4c563f76 | 826 | continue; |
12a169e7 HX |
827 | pol = container_of(x, struct xfrm_policy, walk); |
828 | if (walk->type != XFRM_POLICY_TYPE_ANY && | |
829 | walk->type != pol->type) | |
830 | continue; | |
831 | error = func(pol, xfrm_policy_id2dir(pol->index), | |
832 | walk->seq, data); | |
833 | if (error) { | |
834 | list_move_tail(&walk->walk.all, &x->all); | |
835 | goto out; | |
2518c7c2 | 836 | } |
12a169e7 | 837 | walk->seq++; |
1da177e4 | 838 | } |
12a169e7 | 839 | if (walk->seq == 0) { |
baf5d743 JHS |
840 | error = -ENOENT; |
841 | goto out; | |
842 | } | |
12a169e7 | 843 | list_del_init(&walk->walk.all); |
1da177e4 | 844 | out: |
12a169e7 | 845 | write_unlock_bh(&xfrm_policy_lock); |
1da177e4 LT |
846 | return error; |
847 | } | |
848 | EXPORT_SYMBOL(xfrm_policy_walk); | |
849 | ||
12a169e7 HX |
850 | void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) |
851 | { | |
852 | INIT_LIST_HEAD(&walk->walk.all); | |
853 | walk->walk.dead = 1; | |
854 | walk->type = type; | |
855 | walk->seq = 0; | |
856 | } | |
857 | EXPORT_SYMBOL(xfrm_policy_walk_init); | |
858 | ||
859 | void xfrm_policy_walk_done(struct xfrm_policy_walk *walk) | |
860 | { | |
861 | if (list_empty(&walk->walk.all)) | |
862 | return; | |
863 | ||
864 | write_lock_bh(&xfrm_policy_lock); | |
865 | list_del(&walk->walk.all); | |
866 | write_unlock_bh(&xfrm_policy_lock); | |
867 | } | |
868 | EXPORT_SYMBOL(xfrm_policy_walk_done); | |
869 | ||
134b0fc5 JM |
870 | /* |
871 | * Find policy to apply to this flow. | |
872 | * | |
873 | * Returns 0 if policy found, else an -errno. | |
874 | */ | |
f299d557 DM |
875 | static int xfrm_policy_match(const struct xfrm_policy *pol, |
876 | const struct flowi *fl, | |
2518c7c2 | 877 | u8 type, u16 family, int dir) |
1da177e4 | 878 | { |
f299d557 | 879 | const struct xfrm_selector *sel = &pol->selector; |
134b0fc5 | 880 | int match, ret = -ESRCH; |
1da177e4 | 881 | |
2518c7c2 | 882 | if (pol->family != family || |
1d28f42c | 883 | (fl->flowi_mark & pol->mark.m) != pol->mark.v || |
2518c7c2 | 884 | pol->type != type) |
134b0fc5 | 885 | return ret; |
1da177e4 | 886 | |
2518c7c2 | 887 | match = xfrm_selector_match(sel, fl, family); |
134b0fc5 | 888 | if (match) |
1d28f42c | 889 | ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid, |
03e1ad7b | 890 | dir); |
2518c7c2 | 891 | |
134b0fc5 | 892 | return ret; |
2518c7c2 | 893 | } |
1da177e4 | 894 | |
52479b62 | 895 | static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, |
062cdb43 | 896 | const struct flowi *fl, |
2518c7c2 DM |
897 | u16 family, u8 dir) |
898 | { | |
134b0fc5 | 899 | int err; |
2518c7c2 | 900 | struct xfrm_policy *pol, *ret; |
0b597e7e | 901 | const xfrm_address_t *daddr, *saddr; |
2518c7c2 DM |
902 | struct hlist_node *entry; |
903 | struct hlist_head *chain; | |
acba48e1 | 904 | u32 priority = ~0U; |
df71837d | 905 | |
2518c7c2 DM |
906 | daddr = xfrm_flowi_daddr(fl, family); |
907 | saddr = xfrm_flowi_saddr(fl, family); | |
908 | if (unlikely(!daddr || !saddr)) | |
909 | return NULL; | |
910 | ||
911 | read_lock_bh(&xfrm_policy_lock); | |
52479b62 | 912 | chain = policy_hash_direct(net, daddr, saddr, family, dir); |
2518c7c2 DM |
913 | ret = NULL; |
914 | hlist_for_each_entry(pol, entry, chain, bydst) { | |
134b0fc5 JM |
915 | err = xfrm_policy_match(pol, fl, type, family, dir); |
916 | if (err) { | |
917 | if (err == -ESRCH) | |
918 | continue; | |
919 | else { | |
920 | ret = ERR_PTR(err); | |
921 | goto fail; | |
922 | } | |
923 | } else { | |
2518c7c2 | 924 | ret = pol; |
acba48e1 | 925 | priority = ret->priority; |
2518c7c2 DM |
926 | break; |
927 | } | |
928 | } | |
52479b62 | 929 | chain = &net->xfrm.policy_inexact[dir]; |
acba48e1 | 930 | hlist_for_each_entry(pol, entry, chain, bydst) { |
134b0fc5 JM |
931 | err = xfrm_policy_match(pol, fl, type, family, dir); |
932 | if (err) { | |
933 | if (err == -ESRCH) | |
934 | continue; | |
935 | else { | |
936 | ret = ERR_PTR(err); | |
937 | goto fail; | |
938 | } | |
939 | } else if (pol->priority < priority) { | |
acba48e1 DM |
940 | ret = pol; |
941 | break; | |
1da177e4 LT |
942 | } |
943 | } | |
acba48e1 DM |
944 | if (ret) |
945 | xfrm_pol_hold(ret); | |
134b0fc5 | 946 | fail: |
1da177e4 | 947 | read_unlock_bh(&xfrm_policy_lock); |
4e81bb83 | 948 | |
2518c7c2 | 949 | return ret; |
4e81bb83 MN |
950 | } |
951 | ||
80c802f3 | 952 | static struct xfrm_policy * |
73ff93cd | 953 | __xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir) |
80c802f3 TT |
954 | { |
955 | #ifdef CONFIG_XFRM_SUB_POLICY | |
956 | struct xfrm_policy *pol; | |
957 | ||
958 | pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, dir); | |
959 | if (pol != NULL) | |
960 | return pol; | |
961 | #endif | |
962 | return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, dir); | |
963 | } | |
964 | ||
fe1a5f03 | 965 | static struct flow_cache_object * |
dee9f4bc | 966 | xfrm_policy_lookup(struct net *net, const struct flowi *fl, u16 family, |
fe1a5f03 | 967 | u8 dir, struct flow_cache_object *old_obj, void *ctx) |
4e81bb83 MN |
968 | { |
969 | struct xfrm_policy *pol; | |
fe1a5f03 TT |
970 | |
971 | if (old_obj) | |
972 | xfrm_pol_put(container_of(old_obj, struct xfrm_policy, flo)); | |
4e81bb83 | 973 | |
80c802f3 TT |
974 | pol = __xfrm_policy_lookup(net, fl, family, dir); |
975 | if (IS_ERR_OR_NULL(pol)) | |
fe1a5f03 | 976 | return ERR_CAST(pol); |
fe1a5f03 | 977 | |
fe1a5f03 TT |
978 | /* Resolver returns two references: |
979 | * one for cache and one for caller of flow_cache_lookup() */ | |
980 | xfrm_pol_hold(pol); | |
981 | ||
982 | return &pol->flo; | |
1da177e4 LT |
983 | } |
984 | ||
df71837d TJ |
985 | static inline int policy_to_flow_dir(int dir) |
986 | { | |
987 | if (XFRM_POLICY_IN == FLOW_DIR_IN && | |
a716c119 YH |
988 | XFRM_POLICY_OUT == FLOW_DIR_OUT && |
989 | XFRM_POLICY_FWD == FLOW_DIR_FWD) | |
990 | return dir; | |
991 | switch (dir) { | |
992 | default: | |
993 | case XFRM_POLICY_IN: | |
994 | return FLOW_DIR_IN; | |
995 | case XFRM_POLICY_OUT: | |
996 | return FLOW_DIR_OUT; | |
997 | case XFRM_POLICY_FWD: | |
998 | return FLOW_DIR_FWD; | |
3ff50b79 | 999 | } |
df71837d TJ |
1000 | } |
1001 | ||
dee9f4bc DM |
1002 | static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, |
1003 | const struct flowi *fl) | |
1da177e4 LT |
1004 | { |
1005 | struct xfrm_policy *pol; | |
1006 | ||
1007 | read_lock_bh(&xfrm_policy_lock); | |
1008 | if ((pol = sk->sk_policy[dir]) != NULL) { | |
a716c119 | 1009 | int match = xfrm_selector_match(&pol->selector, fl, |
1da177e4 | 1010 | sk->sk_family); |
a716c119 | 1011 | int err = 0; |
df71837d | 1012 | |
3bccfbc7 | 1013 | if (match) { |
34f8d884 JHS |
1014 | if ((sk->sk_mark & pol->mark.m) != pol->mark.v) { |
1015 | pol = NULL; | |
1016 | goto out; | |
1017 | } | |
03e1ad7b | 1018 | err = security_xfrm_policy_lookup(pol->security, |
1d28f42c | 1019 | fl->flowi_secid, |
03e1ad7b | 1020 | policy_to_flow_dir(dir)); |
3bccfbc7 VY |
1021 | if (!err) |
1022 | xfrm_pol_hold(pol); | |
1023 | else if (err == -ESRCH) | |
1024 | pol = NULL; | |
1025 | else | |
1026 | pol = ERR_PTR(err); | |
1027 | } else | |
1da177e4 LT |
1028 | pol = NULL; |
1029 | } | |
34f8d884 | 1030 | out: |
1da177e4 LT |
1031 | read_unlock_bh(&xfrm_policy_lock); |
1032 | return pol; | |
1033 | } | |
1034 | ||
1035 | static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) | |
1036 | { | |
98806f75 | 1037 | struct net *net = xp_net(pol); |
1121994c | 1038 | struct hlist_head *chain = policy_hash_bysel(net, &pol->selector, |
2518c7c2 | 1039 | pol->family, dir); |
4e81bb83 | 1040 | |
98806f75 | 1041 | list_add(&pol->walk.all, &net->xfrm.policy_all); |
2518c7c2 | 1042 | hlist_add_head(&pol->bydst, chain); |
e92303f8 | 1043 | hlist_add_head(&pol->byidx, net->xfrm.policy_byidx+idx_hash(net, pol->index)); |
98806f75 | 1044 | net->xfrm.policy_count[dir]++; |
1da177e4 | 1045 | xfrm_pol_hold(pol); |
2518c7c2 | 1046 | |
98806f75 AD |
1047 | if (xfrm_bydst_should_resize(net, dir, NULL)) |
1048 | schedule_work(&net->xfrm.policy_hash_work); | |
1da177e4 LT |
1049 | } |
1050 | ||
1051 | static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, | |
1052 | int dir) | |
1053 | { | |
98806f75 AD |
1054 | struct net *net = xp_net(pol); |
1055 | ||
2518c7c2 DM |
1056 | if (hlist_unhashed(&pol->bydst)) |
1057 | return NULL; | |
1da177e4 | 1058 | |
2518c7c2 DM |
1059 | hlist_del(&pol->bydst); |
1060 | hlist_del(&pol->byidx); | |
12a169e7 | 1061 | list_del(&pol->walk.all); |
98806f75 | 1062 | net->xfrm.policy_count[dir]--; |
2518c7c2 DM |
1063 | |
1064 | return pol; | |
1da177e4 LT |
1065 | } |
1066 | ||
4666faab | 1067 | int xfrm_policy_delete(struct xfrm_policy *pol, int dir) |
1da177e4 LT |
1068 | { |
1069 | write_lock_bh(&xfrm_policy_lock); | |
1070 | pol = __xfrm_policy_unlink(pol, dir); | |
1071 | write_unlock_bh(&xfrm_policy_lock); | |
1072 | if (pol) { | |
1da177e4 | 1073 | xfrm_policy_kill(pol); |
4666faab | 1074 | return 0; |
1da177e4 | 1075 | } |
4666faab | 1076 | return -ENOENT; |
1da177e4 | 1077 | } |
a70fcb0b | 1078 | EXPORT_SYMBOL(xfrm_policy_delete); |
1da177e4 LT |
1079 | |
1080 | int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) | |
1081 | { | |
1121994c | 1082 | struct net *net = xp_net(pol); |
1da177e4 LT |
1083 | struct xfrm_policy *old_pol; |
1084 | ||
4e81bb83 MN |
1085 | #ifdef CONFIG_XFRM_SUB_POLICY |
1086 | if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) | |
1087 | return -EINVAL; | |
1088 | #endif | |
1089 | ||
1da177e4 LT |
1090 | write_lock_bh(&xfrm_policy_lock); |
1091 | old_pol = sk->sk_policy[dir]; | |
1092 | sk->sk_policy[dir] = pol; | |
1093 | if (pol) { | |
9d729f72 | 1094 | pol->curlft.add_time = get_seconds(); |
1121994c | 1095 | pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir); |
1da177e4 LT |
1096 | __xfrm_policy_link(pol, XFRM_POLICY_MAX+dir); |
1097 | } | |
1098 | if (old_pol) | |
ea2dea9d TT |
1099 | /* Unlinking succeeds always. This is the only function |
1100 | * allowed to delete or replace socket policy. | |
1101 | */ | |
1da177e4 LT |
1102 | __xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir); |
1103 | write_unlock_bh(&xfrm_policy_lock); | |
1104 | ||
1105 | if (old_pol) { | |
1106 | xfrm_policy_kill(old_pol); | |
1107 | } | |
1108 | return 0; | |
1109 | } | |
1110 | ||
d3e40a9f | 1111 | static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) |
1da177e4 | 1112 | { |
0331b1f3 | 1113 | struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); |
1da177e4 LT |
1114 | |
1115 | if (newp) { | |
1116 | newp->selector = old->selector; | |
03e1ad7b PM |
1117 | if (security_xfrm_policy_clone(old->security, |
1118 | &newp->security)) { | |
df71837d TJ |
1119 | kfree(newp); |
1120 | return NULL; /* ENOMEM */ | |
1121 | } | |
1da177e4 LT |
1122 | newp->lft = old->lft; |
1123 | newp->curlft = old->curlft; | |
fb977e2c | 1124 | newp->mark = old->mark; |
1da177e4 LT |
1125 | newp->action = old->action; |
1126 | newp->flags = old->flags; | |
1127 | newp->xfrm_nr = old->xfrm_nr; | |
1128 | newp->index = old->index; | |
4e81bb83 | 1129 | newp->type = old->type; |
1da177e4 LT |
1130 | memcpy(newp->xfrm_vec, old->xfrm_vec, |
1131 | newp->xfrm_nr*sizeof(struct xfrm_tmpl)); | |
1132 | write_lock_bh(&xfrm_policy_lock); | |
1133 | __xfrm_policy_link(newp, XFRM_POLICY_MAX+dir); | |
1134 | write_unlock_bh(&xfrm_policy_lock); | |
1135 | xfrm_pol_put(newp); | |
1136 | } | |
1137 | return newp; | |
1138 | } | |
1139 | ||
1140 | int __xfrm_sk_clone_policy(struct sock *sk) | |
1141 | { | |
1142 | struct xfrm_policy *p0 = sk->sk_policy[0], | |
1143 | *p1 = sk->sk_policy[1]; | |
1144 | ||
1145 | sk->sk_policy[0] = sk->sk_policy[1] = NULL; | |
1146 | if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL) | |
1147 | return -ENOMEM; | |
1148 | if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL) | |
1149 | return -ENOMEM; | |
1150 | return 0; | |
1151 | } | |
1152 | ||
a1e59abf | 1153 | static int |
fbda33b2 | 1154 | xfrm_get_saddr(struct net *net, xfrm_address_t *local, xfrm_address_t *remote, |
a1e59abf PM |
1155 | unsigned short family) |
1156 | { | |
1157 | int err; | |
1158 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1159 | ||
1160 | if (unlikely(afinfo == NULL)) | |
1161 | return -EINVAL; | |
fbda33b2 | 1162 | err = afinfo->get_saddr(net, local, remote); |
a1e59abf PM |
1163 | xfrm_policy_put_afinfo(afinfo); |
1164 | return err; | |
1165 | } | |
1166 | ||
1da177e4 LT |
1167 | /* Resolve list of templates for the flow, given policy. */ |
1168 | ||
1169 | static int | |
a6c2e611 DM |
1170 | xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, |
1171 | struct xfrm_state **xfrm, unsigned short family) | |
1da177e4 | 1172 | { |
fbda33b2 | 1173 | struct net *net = xp_net(policy); |
1da177e4 LT |
1174 | int nx; |
1175 | int i, error; | |
1176 | xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); | |
1177 | xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); | |
a1e59abf | 1178 | xfrm_address_t tmp; |
1da177e4 LT |
1179 | |
1180 | for (nx=0, i = 0; i < policy->xfrm_nr; i++) { | |
1181 | struct xfrm_state *x; | |
1182 | xfrm_address_t *remote = daddr; | |
1183 | xfrm_address_t *local = saddr; | |
1184 | struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; | |
1185 | ||
48b8d783 JK |
1186 | if (tmpl->mode == XFRM_MODE_TUNNEL || |
1187 | tmpl->mode == XFRM_MODE_BEET) { | |
1da177e4 LT |
1188 | remote = &tmpl->id.daddr; |
1189 | local = &tmpl->saddr; | |
8444cf71 TE |
1190 | if (xfrm_addr_any(local, tmpl->encap_family)) { |
1191 | error = xfrm_get_saddr(net, &tmp, remote, tmpl->encap_family); | |
a1e59abf PM |
1192 | if (error) |
1193 | goto fail; | |
1194 | local = &tmp; | |
1195 | } | |
1da177e4 LT |
1196 | } |
1197 | ||
1198 | x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family); | |
1199 | ||
1200 | if (x && x->km.state == XFRM_STATE_VALID) { | |
1201 | xfrm[nx++] = x; | |
1202 | daddr = remote; | |
1203 | saddr = local; | |
1204 | continue; | |
1205 | } | |
1206 | if (x) { | |
1207 | error = (x->km.state == XFRM_STATE_ERROR ? | |
1208 | -EINVAL : -EAGAIN); | |
1209 | xfrm_state_put(x); | |
1210 | } | |
a4322266 | 1211 | else if (error == -ESRCH) |
1212 | error = -EAGAIN; | |
1da177e4 LT |
1213 | |
1214 | if (!tmpl->optional) | |
1215 | goto fail; | |
1216 | } | |
1217 | return nx; | |
1218 | ||
1219 | fail: | |
1220 | for (nx--; nx>=0; nx--) | |
1221 | xfrm_state_put(xfrm[nx]); | |
1222 | return error; | |
1223 | } | |
1224 | ||
4e81bb83 | 1225 | static int |
a6c2e611 DM |
1226 | xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, |
1227 | struct xfrm_state **xfrm, unsigned short family) | |
4e81bb83 | 1228 | { |
41a49cc3 MN |
1229 | struct xfrm_state *tp[XFRM_MAX_DEPTH]; |
1230 | struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; | |
4e81bb83 MN |
1231 | int cnx = 0; |
1232 | int error; | |
1233 | int ret; | |
1234 | int i; | |
1235 | ||
1236 | for (i = 0; i < npols; i++) { | |
1237 | if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
1238 | error = -ENOBUFS; | |
1239 | goto fail; | |
1240 | } | |
41a49cc3 MN |
1241 | |
1242 | ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); | |
4e81bb83 MN |
1243 | if (ret < 0) { |
1244 | error = ret; | |
1245 | goto fail; | |
1246 | } else | |
1247 | cnx += ret; | |
1248 | } | |
1249 | ||
41a49cc3 MN |
1250 | /* found states are sorted for outbound processing */ |
1251 | if (npols > 1) | |
1252 | xfrm_state_sort(xfrm, tpp, cnx, family); | |
1253 | ||
4e81bb83 MN |
1254 | return cnx; |
1255 | ||
1256 | fail: | |
1257 | for (cnx--; cnx>=0; cnx--) | |
41a49cc3 | 1258 | xfrm_state_put(tpp[cnx]); |
4e81bb83 MN |
1259 | return error; |
1260 | ||
1261 | } | |
1262 | ||
1da177e4 LT |
1263 | /* Check that the bundle accepts the flow and its components are |
1264 | * still valid. | |
1265 | */ | |
1266 | ||
05d84025 | 1267 | static inline int xfrm_get_tos(const struct flowi *fl, int family) |
25ee3286 HX |
1268 | { |
1269 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1270 | int tos; | |
1da177e4 | 1271 | |
25ee3286 HX |
1272 | if (!afinfo) |
1273 | return -EINVAL; | |
1274 | ||
1275 | tos = afinfo->get_tos(fl); | |
1276 | ||
1277 | xfrm_policy_put_afinfo(afinfo); | |
1278 | ||
1279 | return tos; | |
1280 | } | |
1281 | ||
80c802f3 TT |
1282 | static struct flow_cache_object *xfrm_bundle_flo_get(struct flow_cache_object *flo) |
1283 | { | |
1284 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1285 | struct dst_entry *dst = &xdst->u.dst; | |
1286 | ||
1287 | if (xdst->route == NULL) { | |
1288 | /* Dummy bundle - if it has xfrms we were not | |
1289 | * able to build bundle as template resolution failed. | |
1290 | * It means we need to try again resolving. */ | |
1291 | if (xdst->num_xfrms > 0) | |
1292 | return NULL; | |
1293 | } else { | |
1294 | /* Real bundle */ | |
1295 | if (stale_bundle(dst)) | |
1296 | return NULL; | |
1297 | } | |
1298 | ||
1299 | dst_hold(dst); | |
1300 | return flo; | |
1301 | } | |
1302 | ||
1303 | static int xfrm_bundle_flo_check(struct flow_cache_object *flo) | |
1304 | { | |
1305 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1306 | struct dst_entry *dst = &xdst->u.dst; | |
1307 | ||
1308 | if (!xdst->route) | |
1309 | return 0; | |
1310 | if (stale_bundle(dst)) | |
1311 | return 0; | |
1312 | ||
1313 | return 1; | |
1314 | } | |
1315 | ||
1316 | static void xfrm_bundle_flo_delete(struct flow_cache_object *flo) | |
1317 | { | |
1318 | struct xfrm_dst *xdst = container_of(flo, struct xfrm_dst, flo); | |
1319 | struct dst_entry *dst = &xdst->u.dst; | |
1320 | ||
1321 | dst_free(dst); | |
1322 | } | |
1323 | ||
1324 | static const struct flow_cache_ops xfrm_bundle_fc_ops = { | |
1325 | .get = xfrm_bundle_flo_get, | |
1326 | .check = xfrm_bundle_flo_check, | |
1327 | .delete = xfrm_bundle_flo_delete, | |
1328 | }; | |
1329 | ||
d7c7544c | 1330 | static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) |
1da177e4 | 1331 | { |
1da177e4 | 1332 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); |
d7c7544c | 1333 | struct dst_ops *dst_ops; |
25ee3286 HX |
1334 | struct xfrm_dst *xdst; |
1335 | ||
1336 | if (!afinfo) | |
1337 | return ERR_PTR(-EINVAL); | |
1338 | ||
d7c7544c AD |
1339 | switch (family) { |
1340 | case AF_INET: | |
1341 | dst_ops = &net->xfrm.xfrm4_dst_ops; | |
1342 | break; | |
1343 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1344 | case AF_INET6: | |
1345 | dst_ops = &net->xfrm.xfrm6_dst_ops; | |
1346 | break; | |
1347 | #endif | |
1348 | default: | |
1349 | BUG(); | |
1350 | } | |
5c1e6aa3 | 1351 | xdst = dst_alloc(dst_ops, NULL, 0, 0, 0); |
25ee3286 HX |
1352 | xfrm_policy_put_afinfo(afinfo); |
1353 | ||
0b150932 HS |
1354 | if (likely(xdst)) |
1355 | xdst->flo.ops = &xfrm_bundle_fc_ops; | |
1356 | else | |
1357 | xdst = ERR_PTR(-ENOBUFS); | |
80c802f3 | 1358 | |
25ee3286 HX |
1359 | return xdst; |
1360 | } | |
1361 | ||
a1b05140 MN |
1362 | static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, |
1363 | int nfheader_len) | |
1364 | { | |
1365 | struct xfrm_policy_afinfo *afinfo = | |
1366 | xfrm_policy_get_afinfo(dst->ops->family); | |
1367 | int err; | |
1368 | ||
1369 | if (!afinfo) | |
1370 | return -EINVAL; | |
1371 | ||
1372 | err = afinfo->init_path(path, dst, nfheader_len); | |
1373 | ||
1374 | xfrm_policy_put_afinfo(afinfo); | |
1375 | ||
1376 | return err; | |
1377 | } | |
1378 | ||
87c1e12b | 1379 | static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, |
0c7b3eef | 1380 | const struct flowi *fl) |
25ee3286 HX |
1381 | { |
1382 | struct xfrm_policy_afinfo *afinfo = | |
1383 | xfrm_policy_get_afinfo(xdst->u.dst.ops->family); | |
1384 | int err; | |
1385 | ||
1386 | if (!afinfo) | |
1da177e4 | 1387 | return -EINVAL; |
25ee3286 | 1388 | |
87c1e12b | 1389 | err = afinfo->fill_dst(xdst, dev, fl); |
25ee3286 | 1390 | |
1da177e4 | 1391 | xfrm_policy_put_afinfo(afinfo); |
25ee3286 | 1392 | |
1da177e4 LT |
1393 | return err; |
1394 | } | |
1395 | ||
80c802f3 | 1396 | |
25ee3286 HX |
1397 | /* Allocate chain of dst_entry's, attach known xfrm's, calculate |
1398 | * all the metrics... Shortly, bundle a bundle. | |
1399 | */ | |
1400 | ||
1401 | static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, | |
1402 | struct xfrm_state **xfrm, int nx, | |
98313ada | 1403 | const struct flowi *fl, |
25ee3286 HX |
1404 | struct dst_entry *dst) |
1405 | { | |
d7c7544c | 1406 | struct net *net = xp_net(policy); |
25ee3286 HX |
1407 | unsigned long now = jiffies; |
1408 | struct net_device *dev; | |
1409 | struct dst_entry *dst_prev = NULL; | |
1410 | struct dst_entry *dst0 = NULL; | |
1411 | int i = 0; | |
1412 | int err; | |
1413 | int header_len = 0; | |
a1b05140 | 1414 | int nfheader_len = 0; |
25ee3286 HX |
1415 | int trailer_len = 0; |
1416 | int tos; | |
1417 | int family = policy->selector.family; | |
9bb182a7 YH |
1418 | xfrm_address_t saddr, daddr; |
1419 | ||
1420 | xfrm_flowi_addr_get(fl, &saddr, &daddr, family); | |
25ee3286 HX |
1421 | |
1422 | tos = xfrm_get_tos(fl, family); | |
1423 | err = tos; | |
1424 | if (tos < 0) | |
1425 | goto put_states; | |
1426 | ||
1427 | dst_hold(dst); | |
1428 | ||
1429 | for (; i < nx; i++) { | |
d7c7544c | 1430 | struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); |
25ee3286 HX |
1431 | struct dst_entry *dst1 = &xdst->u.dst; |
1432 | ||
1433 | err = PTR_ERR(xdst); | |
1434 | if (IS_ERR(xdst)) { | |
1435 | dst_release(dst); | |
1436 | goto put_states; | |
1437 | } | |
1438 | ||
1439 | if (!dst_prev) | |
1440 | dst0 = dst1; | |
1441 | else { | |
1442 | dst_prev->child = dst_clone(dst1); | |
1443 | dst1->flags |= DST_NOHASH; | |
1444 | } | |
1445 | ||
1446 | xdst->route = dst; | |
defb3519 | 1447 | dst_copy_metrics(dst1, dst); |
25ee3286 HX |
1448 | |
1449 | if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { | |
1450 | family = xfrm[i]->props.family; | |
9bb182a7 YH |
1451 | dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr, |
1452 | family); | |
25ee3286 HX |
1453 | err = PTR_ERR(dst); |
1454 | if (IS_ERR(dst)) | |
1455 | goto put_states; | |
1456 | } else | |
1457 | dst_hold(dst); | |
1458 | ||
1459 | dst1->xfrm = xfrm[i]; | |
80c802f3 | 1460 | xdst->xfrm_genid = xfrm[i]->genid; |
25ee3286 HX |
1461 | |
1462 | dst1->obsolete = -1; | |
1463 | dst1->flags |= DST_HOST; | |
1464 | dst1->lastuse = now; | |
1465 | ||
1466 | dst1->input = dst_discard; | |
1467 | dst1->output = xfrm[i]->outer_mode->afinfo->output; | |
1468 | ||
1469 | dst1->next = dst_prev; | |
1470 | dst_prev = dst1; | |
1471 | ||
1472 | header_len += xfrm[i]->props.header_len; | |
a1b05140 MN |
1473 | if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) |
1474 | nfheader_len += xfrm[i]->props.header_len; | |
25ee3286 HX |
1475 | trailer_len += xfrm[i]->props.trailer_len; |
1476 | } | |
1477 | ||
1478 | dst_prev->child = dst; | |
1479 | dst0->path = dst; | |
1480 | ||
1481 | err = -ENODEV; | |
1482 | dev = dst->dev; | |
1483 | if (!dev) | |
1484 | goto free_dst; | |
1485 | ||
96c53401 | 1486 | /* Copy neighbour for reachability confirmation */ |
25ee3286 HX |
1487 | dst0->neighbour = neigh_clone(dst->neighbour); |
1488 | ||
a1b05140 | 1489 | xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len); |
25ee3286 HX |
1490 | xfrm_init_pmtu(dst_prev); |
1491 | ||
1492 | for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) { | |
1493 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev; | |
1494 | ||
87c1e12b | 1495 | err = xfrm_fill_dst(xdst, dev, fl); |
25ee3286 HX |
1496 | if (err) |
1497 | goto free_dst; | |
1498 | ||
1499 | dst_prev->header_len = header_len; | |
1500 | dst_prev->trailer_len = trailer_len; | |
1501 | header_len -= xdst->u.dst.xfrm->props.header_len; | |
1502 | trailer_len -= xdst->u.dst.xfrm->props.trailer_len; | |
1503 | } | |
1504 | ||
1505 | out: | |
1506 | return dst0; | |
1507 | ||
1508 | put_states: | |
1509 | for (; i < nx; i++) | |
1510 | xfrm_state_put(xfrm[i]); | |
1511 | free_dst: | |
1512 | if (dst0) | |
1513 | dst_free(dst0); | |
1514 | dst0 = ERR_PTR(err); | |
1515 | goto out; | |
1516 | } | |
1517 | ||
157bfc25 | 1518 | static int inline |
3f0e18fb | 1519 | xfrm_dst_alloc_copy(void **target, const void *src, int size) |
157bfc25 MN |
1520 | { |
1521 | if (!*target) { | |
1522 | *target = kmalloc(size, GFP_ATOMIC); | |
1523 | if (!*target) | |
1524 | return -ENOMEM; | |
1525 | } | |
1526 | memcpy(*target, src, size); | |
1527 | return 0; | |
1528 | } | |
1529 | ||
1530 | static int inline | |
1786b389 | 1531 | xfrm_dst_update_parent(struct dst_entry *dst, const struct xfrm_selector *sel) |
157bfc25 MN |
1532 | { |
1533 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1534 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1535 | return xfrm_dst_alloc_copy((void **)&(xdst->partner), | |
1536 | sel, sizeof(*sel)); | |
1537 | #else | |
1538 | return 0; | |
1539 | #endif | |
1540 | } | |
1541 | ||
1542 | static int inline | |
3f0e18fb | 1543 | xfrm_dst_update_origin(struct dst_entry *dst, const struct flowi *fl) |
157bfc25 MN |
1544 | { |
1545 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1546 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
1547 | return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl)); | |
1548 | #else | |
1549 | return 0; | |
1550 | #endif | |
1551 | } | |
1da177e4 | 1552 | |
73ff93cd | 1553 | static int xfrm_expand_policies(const struct flowi *fl, u16 family, |
80c802f3 TT |
1554 | struct xfrm_policy **pols, |
1555 | int *num_pols, int *num_xfrms) | |
1556 | { | |
1557 | int i; | |
1558 | ||
1559 | if (*num_pols == 0 || !pols[0]) { | |
1560 | *num_pols = 0; | |
1561 | *num_xfrms = 0; | |
1562 | return 0; | |
1563 | } | |
1564 | if (IS_ERR(pols[0])) | |
1565 | return PTR_ERR(pols[0]); | |
1566 | ||
1567 | *num_xfrms = pols[0]->xfrm_nr; | |
1568 | ||
1569 | #ifdef CONFIG_XFRM_SUB_POLICY | |
1570 | if (pols[0] && pols[0]->action == XFRM_POLICY_ALLOW && | |
1571 | pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
1572 | pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), | |
1573 | XFRM_POLICY_TYPE_MAIN, | |
1574 | fl, family, | |
1575 | XFRM_POLICY_OUT); | |
1576 | if (pols[1]) { | |
1577 | if (IS_ERR(pols[1])) { | |
1578 | xfrm_pols_put(pols, *num_pols); | |
1579 | return PTR_ERR(pols[1]); | |
1580 | } | |
1581 | (*num_pols) ++; | |
1582 | (*num_xfrms) += pols[1]->xfrm_nr; | |
1583 | } | |
1584 | } | |
1585 | #endif | |
1586 | for (i = 0; i < *num_pols; i++) { | |
1587 | if (pols[i]->action != XFRM_POLICY_ALLOW) { | |
1588 | *num_xfrms = -1; | |
1589 | break; | |
1590 | } | |
1591 | } | |
1592 | ||
1593 | return 0; | |
1594 | ||
1595 | } | |
1596 | ||
1597 | static struct xfrm_dst * | |
1598 | xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, | |
4ca2e685 | 1599 | const struct flowi *fl, u16 family, |
80c802f3 TT |
1600 | struct dst_entry *dst_orig) |
1601 | { | |
1602 | struct net *net = xp_net(pols[0]); | |
1603 | struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; | |
1604 | struct dst_entry *dst; | |
1605 | struct xfrm_dst *xdst; | |
1606 | int err; | |
1607 | ||
1608 | /* Try to instantiate a bundle */ | |
1609 | err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); | |
d809ec89 TT |
1610 | if (err <= 0) { |
1611 | if (err != 0 && err != -EAGAIN) | |
80c802f3 TT |
1612 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); |
1613 | return ERR_PTR(err); | |
1614 | } | |
1615 | ||
1616 | dst = xfrm_bundle_create(pols[0], xfrm, err, fl, dst_orig); | |
1617 | if (IS_ERR(dst)) { | |
1618 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); | |
1619 | return ERR_CAST(dst); | |
1620 | } | |
1621 | ||
1622 | xdst = (struct xfrm_dst *)dst; | |
1623 | xdst->num_xfrms = err; | |
1624 | if (num_pols > 1) | |
1625 | err = xfrm_dst_update_parent(dst, &pols[1]->selector); | |
1626 | else | |
1627 | err = xfrm_dst_update_origin(dst, fl); | |
1628 | if (unlikely(err)) { | |
1629 | dst_free(dst); | |
1630 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLECHECKERROR); | |
1631 | return ERR_PTR(err); | |
1632 | } | |
1633 | ||
1634 | xdst->num_pols = num_pols; | |
1635 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1636 | xdst->policy_genid = atomic_read(&pols[0]->genid); | |
1637 | ||
1638 | return xdst; | |
1639 | } | |
1640 | ||
1641 | static struct flow_cache_object * | |
dee9f4bc | 1642 | xfrm_bundle_lookup(struct net *net, const struct flowi *fl, u16 family, u8 dir, |
80c802f3 TT |
1643 | struct flow_cache_object *oldflo, void *ctx) |
1644 | { | |
1645 | struct dst_entry *dst_orig = (struct dst_entry *)ctx; | |
1646 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; | |
1647 | struct xfrm_dst *xdst, *new_xdst; | |
1648 | int num_pols = 0, num_xfrms = 0, i, err, pol_dead; | |
1649 | ||
1650 | /* Check if the policies from old bundle are usable */ | |
1651 | xdst = NULL; | |
1652 | if (oldflo) { | |
1653 | xdst = container_of(oldflo, struct xfrm_dst, flo); | |
1654 | num_pols = xdst->num_pols; | |
1655 | num_xfrms = xdst->num_xfrms; | |
1656 | pol_dead = 0; | |
1657 | for (i = 0; i < num_pols; i++) { | |
1658 | pols[i] = xdst->pols[i]; | |
1659 | pol_dead |= pols[i]->walk.dead; | |
1660 | } | |
1661 | if (pol_dead) { | |
1662 | dst_free(&xdst->u.dst); | |
1663 | xdst = NULL; | |
1664 | num_pols = 0; | |
1665 | num_xfrms = 0; | |
1666 | oldflo = NULL; | |
1667 | } | |
1668 | } | |
1669 | ||
1670 | /* Resolve policies to use if we couldn't get them from | |
1671 | * previous cache entry */ | |
1672 | if (xdst == NULL) { | |
1673 | num_pols = 1; | |
1674 | pols[0] = __xfrm_policy_lookup(net, fl, family, dir); | |
1675 | err = xfrm_expand_policies(fl, family, pols, | |
1676 | &num_pols, &num_xfrms); | |
1677 | if (err < 0) | |
1678 | goto inc_error; | |
1679 | if (num_pols == 0) | |
1680 | return NULL; | |
1681 | if (num_xfrms <= 0) | |
1682 | goto make_dummy_bundle; | |
1683 | } | |
1684 | ||
1685 | new_xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, dst_orig); | |
1686 | if (IS_ERR(new_xdst)) { | |
1687 | err = PTR_ERR(new_xdst); | |
1688 | if (err != -EAGAIN) | |
1689 | goto error; | |
1690 | if (oldflo == NULL) | |
1691 | goto make_dummy_bundle; | |
1692 | dst_hold(&xdst->u.dst); | |
1693 | return oldflo; | |
d809ec89 TT |
1694 | } else if (new_xdst == NULL) { |
1695 | num_xfrms = 0; | |
1696 | if (oldflo == NULL) | |
1697 | goto make_dummy_bundle; | |
1698 | xdst->num_xfrms = 0; | |
1699 | dst_hold(&xdst->u.dst); | |
1700 | return oldflo; | |
80c802f3 TT |
1701 | } |
1702 | ||
1703 | /* Kill the previous bundle */ | |
1704 | if (xdst) { | |
1705 | /* The policies were stolen for newly generated bundle */ | |
1706 | xdst->num_pols = 0; | |
1707 | dst_free(&xdst->u.dst); | |
1708 | } | |
1709 | ||
1710 | /* Flow cache does not have reference, it dst_free()'s, | |
1711 | * but we do need to return one reference for original caller */ | |
1712 | dst_hold(&new_xdst->u.dst); | |
1713 | return &new_xdst->flo; | |
1714 | ||
1715 | make_dummy_bundle: | |
1716 | /* We found policies, but there's no bundles to instantiate: | |
1717 | * either because the policy blocks, has no transformations or | |
1718 | * we could not build template (no xfrm_states).*/ | |
1719 | xdst = xfrm_alloc_dst(net, family); | |
1720 | if (IS_ERR(xdst)) { | |
1721 | xfrm_pols_put(pols, num_pols); | |
1722 | return ERR_CAST(xdst); | |
1723 | } | |
1724 | xdst->num_pols = num_pols; | |
1725 | xdst->num_xfrms = num_xfrms; | |
1726 | memcpy(xdst->pols, pols, sizeof(struct xfrm_policy*) * num_pols); | |
1727 | ||
1728 | dst_hold(&xdst->u.dst); | |
1729 | return &xdst->flo; | |
1730 | ||
1731 | inc_error: | |
1732 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); | |
1733 | error: | |
1734 | if (xdst != NULL) | |
1735 | dst_free(&xdst->u.dst); | |
1736 | else | |
1737 | xfrm_pols_put(pols, num_pols); | |
1738 | return ERR_PTR(err); | |
1739 | } | |
1da177e4 | 1740 | |
2774c131 DM |
1741 | static struct dst_entry *make_blackhole(struct net *net, u16 family, |
1742 | struct dst_entry *dst_orig) | |
1743 | { | |
1744 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
1745 | struct dst_entry *ret; | |
1746 | ||
1747 | if (!afinfo) { | |
1748 | dst_release(dst_orig); | |
1749 | ret = ERR_PTR(-EINVAL); | |
1750 | } else { | |
1751 | ret = afinfo->blackhole_route(net, dst_orig); | |
1752 | } | |
1753 | xfrm_policy_put_afinfo(afinfo); | |
1754 | ||
1755 | return ret; | |
1756 | } | |
1757 | ||
1da177e4 LT |
1758 | /* Main function: finds/creates a bundle for given flow. |
1759 | * | |
1760 | * At the moment we eat a raw IP route. Mostly to speed up lookups | |
1761 | * on interfaces with disabled IPsec. | |
1762 | */ | |
452edd59 DM |
1763 | struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, |
1764 | const struct flowi *fl, | |
1765 | struct sock *sk, int flags) | |
1da177e4 | 1766 | { |
4e81bb83 | 1767 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
80c802f3 TT |
1768 | struct flow_cache_object *flo; |
1769 | struct xfrm_dst *xdst; | |
452edd59 | 1770 | struct dst_entry *dst, *route; |
80c802f3 | 1771 | u16 family = dst_orig->ops->family; |
df71837d | 1772 | u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT); |
4b021628 | 1773 | int i, err, num_pols, num_xfrms = 0, drop_pols = 0; |
e0d1caa7 | 1774 | |
1da177e4 | 1775 | restart: |
80c802f3 TT |
1776 | dst = NULL; |
1777 | xdst = NULL; | |
1778 | route = NULL; | |
4e81bb83 | 1779 | |
f7944fb1 | 1780 | if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { |
80c802f3 TT |
1781 | num_pols = 1; |
1782 | pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); | |
1783 | err = xfrm_expand_policies(fl, family, pols, | |
1784 | &num_pols, &num_xfrms); | |
1785 | if (err < 0) | |
75b8c133 | 1786 | goto dropdst; |
80c802f3 TT |
1787 | |
1788 | if (num_pols) { | |
1789 | if (num_xfrms <= 0) { | |
1790 | drop_pols = num_pols; | |
1791 | goto no_transform; | |
1792 | } | |
1793 | ||
1794 | xdst = xfrm_resolve_and_create_bundle( | |
1795 | pols, num_pols, fl, | |
1796 | family, dst_orig); | |
1797 | if (IS_ERR(xdst)) { | |
1798 | xfrm_pols_put(pols, num_pols); | |
1799 | err = PTR_ERR(xdst); | |
1800 | goto dropdst; | |
d809ec89 TT |
1801 | } else if (xdst == NULL) { |
1802 | num_xfrms = 0; | |
1803 | drop_pols = num_pols; | |
1804 | goto no_transform; | |
80c802f3 TT |
1805 | } |
1806 | ||
fbd50608 SK |
1807 | dst_hold(&xdst->u.dst); |
1808 | ||
80c802f3 TT |
1809 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
1810 | xdst->u.dst.next = xfrm_policy_sk_bundles; | |
1811 | xfrm_policy_sk_bundles = &xdst->u.dst; | |
1812 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
1813 | ||
1814 | route = xdst->route; | |
0aa64774 | 1815 | } |
3bccfbc7 | 1816 | } |
1da177e4 | 1817 | |
80c802f3 | 1818 | if (xdst == NULL) { |
1da177e4 | 1819 | /* To accelerate a bit... */ |
2518c7c2 | 1820 | if ((dst_orig->flags & DST_NOXFRM) || |
52479b62 | 1821 | !net->xfrm.policy_count[XFRM_POLICY_OUT]) |
8b7817f3 | 1822 | goto nopol; |
1da177e4 | 1823 | |
80c802f3 TT |
1824 | flo = flow_cache_lookup(net, fl, family, dir, |
1825 | xfrm_bundle_lookup, dst_orig); | |
1826 | if (flo == NULL) | |
1827 | goto nopol; | |
fe1a5f03 | 1828 | if (IS_ERR(flo)) { |
80c802f3 | 1829 | err = PTR_ERR(flo); |
75b8c133 | 1830 | goto dropdst; |
d66e37a9 | 1831 | } |
80c802f3 TT |
1832 | xdst = container_of(flo, struct xfrm_dst, flo); |
1833 | ||
1834 | num_pols = xdst->num_pols; | |
1835 | num_xfrms = xdst->num_xfrms; | |
1836 | memcpy(pols, xdst->pols, sizeof(struct xfrm_policy*) * num_pols); | |
1837 | route = xdst->route; | |
1838 | } | |
1839 | ||
1840 | dst = &xdst->u.dst; | |
1841 | if (route == NULL && num_xfrms > 0) { | |
1842 | /* The only case when xfrm_bundle_lookup() returns a | |
1843 | * bundle with null route, is when the template could | |
1844 | * not be resolved. It means policies are there, but | |
1845 | * bundle could not be created, since we don't yet | |
1846 | * have the xfrm_state's. We need to wait for KM to | |
1847 | * negotiate new SA's or bail out with error.*/ | |
1848 | if (net->xfrm.sysctl_larval_drop) { | |
1849 | /* EREMOTE tells the caller to generate | |
1850 | * a one-shot blackhole route. */ | |
1851 | dst_release(dst); | |
a1aa3483 | 1852 | xfrm_pols_put(pols, drop_pols); |
80c802f3 | 1853 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); |
2774c131 | 1854 | |
452edd59 | 1855 | return make_blackhole(net, family, dst_orig); |
80c802f3 | 1856 | } |
1d28f42c | 1857 | if (fl->flowi_flags & FLOWI_FLAG_CAN_SLEEP) { |
80c802f3 TT |
1858 | DECLARE_WAITQUEUE(wait, current); |
1859 | ||
1860 | add_wait_queue(&net->xfrm.km_waitq, &wait); | |
1861 | set_current_state(TASK_INTERRUPTIBLE); | |
1862 | schedule(); | |
1863 | set_current_state(TASK_RUNNING); | |
1864 | remove_wait_queue(&net->xfrm.km_waitq, &wait); | |
1865 | ||
1866 | if (!signal_pending(current)) { | |
1867 | dst_release(dst); | |
1868 | goto restart; | |
1869 | } | |
1870 | ||
1871 | err = -ERESTART; | |
1872 | } else | |
1873 | err = -EAGAIN; | |
1874 | ||
1875 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); | |
1876 | goto error; | |
1da177e4 LT |
1877 | } |
1878 | ||
80c802f3 TT |
1879 | no_transform: |
1880 | if (num_pols == 0) | |
8b7817f3 | 1881 | goto nopol; |
1da177e4 | 1882 | |
80c802f3 TT |
1883 | if ((flags & XFRM_LOOKUP_ICMP) && |
1884 | !(pols[0]->flags & XFRM_POLICY_ICMP)) { | |
1885 | err = -ENOENT; | |
8b7817f3 | 1886 | goto error; |
80c802f3 | 1887 | } |
8b7817f3 | 1888 | |
80c802f3 TT |
1889 | for (i = 0; i < num_pols; i++) |
1890 | pols[i]->curlft.use_time = get_seconds(); | |
8b7817f3 | 1891 | |
80c802f3 | 1892 | if (num_xfrms < 0) { |
1da177e4 | 1893 | /* Prohibit the flow */ |
59c9940e | 1894 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); |
e104411b PM |
1895 | err = -EPERM; |
1896 | goto error; | |
80c802f3 TT |
1897 | } else if (num_xfrms > 0) { |
1898 | /* Flow transformed */ | |
80c802f3 TT |
1899 | dst_release(dst_orig); |
1900 | } else { | |
1901 | /* Flow passes untransformed */ | |
1902 | dst_release(dst); | |
452edd59 | 1903 | dst = dst_orig; |
1da177e4 | 1904 | } |
80c802f3 TT |
1905 | ok: |
1906 | xfrm_pols_put(pols, drop_pols); | |
452edd59 | 1907 | return dst; |
1da177e4 | 1908 | |
80c802f3 | 1909 | nopol: |
452edd59 DM |
1910 | if (!(flags & XFRM_LOOKUP_ICMP)) { |
1911 | dst = dst_orig; | |
80c802f3 | 1912 | goto ok; |
452edd59 | 1913 | } |
80c802f3 | 1914 | err = -ENOENT; |
1da177e4 | 1915 | error: |
80c802f3 | 1916 | dst_release(dst); |
75b8c133 HX |
1917 | dropdst: |
1918 | dst_release(dst_orig); | |
80c802f3 | 1919 | xfrm_pols_put(pols, drop_pols); |
452edd59 | 1920 | return ERR_PTR(err); |
1da177e4 LT |
1921 | } |
1922 | EXPORT_SYMBOL(xfrm_lookup); | |
1923 | ||
df0ba92a | 1924 | static inline int |
8f029de2 | 1925 | xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) |
df0ba92a MN |
1926 | { |
1927 | struct xfrm_state *x; | |
df0ba92a MN |
1928 | |
1929 | if (!skb->sp || idx < 0 || idx >= skb->sp->len) | |
1930 | return 0; | |
1931 | x = skb->sp->xvec[idx]; | |
1932 | if (!x->type->reject) | |
1933 | return 0; | |
1ecafede | 1934 | return x->type->reject(x, skb, fl); |
df0ba92a MN |
1935 | } |
1936 | ||
1da177e4 LT |
1937 | /* When skb is transformed back to its "native" form, we have to |
1938 | * check policy restrictions. At the moment we make this in maximally | |
1939 | * stupid way. Shame on me. :-) Of course, connected sockets must | |
1940 | * have policy cached at them. | |
1941 | */ | |
1942 | ||
1943 | static inline int | |
7db454b9 | 1944 | xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, |
1da177e4 LT |
1945 | unsigned short family) |
1946 | { | |
1947 | if (xfrm_state_kern(x)) | |
928ba416 | 1948 | return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); |
1da177e4 LT |
1949 | return x->id.proto == tmpl->id.proto && |
1950 | (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && | |
1951 | (x->props.reqid == tmpl->reqid || !tmpl->reqid) && | |
1952 | x->props.mode == tmpl->mode && | |
c5d18e98 | 1953 | (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) || |
f3bd4840 | 1954 | !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && |
7e49e6de MN |
1955 | !(x->props.mode != XFRM_MODE_TRANSPORT && |
1956 | xfrm_state_addr_cmp(tmpl, x, family)); | |
1da177e4 LT |
1957 | } |
1958 | ||
df0ba92a MN |
1959 | /* |
1960 | * 0 or more than 0 is returned when validation is succeeded (either bypass | |
1961 | * because of optional transport mode, or next index of the mathced secpath | |
1962 | * state with the template. | |
1963 | * -1 is returned when no matching template is found. | |
1964 | * Otherwise "-2 - errored_index" is returned. | |
1965 | */ | |
1da177e4 | 1966 | static inline int |
22cccb7e | 1967 | xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start, |
1da177e4 LT |
1968 | unsigned short family) |
1969 | { | |
1970 | int idx = start; | |
1971 | ||
1972 | if (tmpl->optional) { | |
7e49e6de | 1973 | if (tmpl->mode == XFRM_MODE_TRANSPORT) |
1da177e4 LT |
1974 | return start; |
1975 | } else | |
1976 | start = -1; | |
1977 | for (; idx < sp->len; idx++) { | |
dbe5b4aa | 1978 | if (xfrm_state_ok(tmpl, sp->xvec[idx], family)) |
1da177e4 | 1979 | return ++idx; |
df0ba92a MN |
1980 | if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { |
1981 | if (start == -1) | |
1982 | start = -2-idx; | |
1da177e4 | 1983 | break; |
df0ba92a | 1984 | } |
1da177e4 LT |
1985 | } |
1986 | return start; | |
1987 | } | |
1988 | ||
d5422efe HX |
1989 | int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, |
1990 | unsigned int family, int reverse) | |
1da177e4 LT |
1991 | { |
1992 | struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); | |
e0d1caa7 | 1993 | int err; |
1da177e4 LT |
1994 | |
1995 | if (unlikely(afinfo == NULL)) | |
1996 | return -EAFNOSUPPORT; | |
1997 | ||
d5422efe | 1998 | afinfo->decode_session(skb, fl, reverse); |
1d28f42c | 1999 | err = security_xfrm_decode_session(skb, &fl->flowi_secid); |
1da177e4 | 2000 | xfrm_policy_put_afinfo(afinfo); |
e0d1caa7 | 2001 | return err; |
1da177e4 | 2002 | } |
d5422efe | 2003 | EXPORT_SYMBOL(__xfrm_decode_session); |
1da177e4 | 2004 | |
9a7386ec | 2005 | static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp) |
1da177e4 LT |
2006 | { |
2007 | for (; k < sp->len; k++) { | |
df0ba92a | 2008 | if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { |
d1d9facf | 2009 | *idxp = k; |
1da177e4 | 2010 | return 1; |
df0ba92a | 2011 | } |
1da177e4 LT |
2012 | } |
2013 | ||
2014 | return 0; | |
2015 | } | |
2016 | ||
a716c119 | 2017 | int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, |
1da177e4 LT |
2018 | unsigned short family) |
2019 | { | |
f6e1e25d | 2020 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2021 | struct xfrm_policy *pol; |
4e81bb83 MN |
2022 | struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; |
2023 | int npols = 0; | |
2024 | int xfrm_nr; | |
2025 | int pi; | |
d5422efe | 2026 | int reverse; |
1da177e4 | 2027 | struct flowi fl; |
d5422efe | 2028 | u8 fl_dir; |
df0ba92a | 2029 | int xerr_idx = -1; |
1da177e4 | 2030 | |
d5422efe HX |
2031 | reverse = dir & ~XFRM_POLICY_MASK; |
2032 | dir &= XFRM_POLICY_MASK; | |
2033 | fl_dir = policy_to_flow_dir(dir); | |
2034 | ||
0aa64774 | 2035 | if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { |
59c9940e | 2036 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
1da177e4 | 2037 | return 0; |
0aa64774 MN |
2038 | } |
2039 | ||
eb9c7ebe | 2040 | nf_nat_decode_session(skb, &fl, family); |
1da177e4 LT |
2041 | |
2042 | /* First, check used SA against their selectors. */ | |
2043 | if (skb->sp) { | |
2044 | int i; | |
2045 | ||
2046 | for (i=skb->sp->len-1; i>=0; i--) { | |
dbe5b4aa | 2047 | struct xfrm_state *x = skb->sp->xvec[i]; |
0aa64774 | 2048 | if (!xfrm_selector_match(&x->sel, &fl, family)) { |
59c9940e | 2049 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
1da177e4 | 2050 | return 0; |
0aa64774 | 2051 | } |
1da177e4 LT |
2052 | } |
2053 | } | |
2054 | ||
2055 | pol = NULL; | |
3bccfbc7 | 2056 | if (sk && sk->sk_policy[dir]) { |
e0d1caa7 | 2057 | pol = xfrm_sk_policy_lookup(sk, dir, &fl); |
0aa64774 | 2058 | if (IS_ERR(pol)) { |
59c9940e | 2059 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
3bccfbc7 | 2060 | return 0; |
0aa64774 | 2061 | } |
3bccfbc7 | 2062 | } |
1da177e4 | 2063 | |
fe1a5f03 TT |
2064 | if (!pol) { |
2065 | struct flow_cache_object *flo; | |
2066 | ||
2067 | flo = flow_cache_lookup(net, &fl, family, fl_dir, | |
2068 | xfrm_policy_lookup, NULL); | |
2069 | if (IS_ERR_OR_NULL(flo)) | |
2070 | pol = ERR_CAST(flo); | |
2071 | else | |
2072 | pol = container_of(flo, struct xfrm_policy, flo); | |
2073 | } | |
1da177e4 | 2074 | |
0aa64774 | 2075 | if (IS_ERR(pol)) { |
59c9940e | 2076 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2077 | return 0; |
0aa64774 | 2078 | } |
134b0fc5 | 2079 | |
df0ba92a | 2080 | if (!pol) { |
d1d9facf | 2081 | if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) { |
df0ba92a | 2082 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
59c9940e | 2083 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); |
df0ba92a MN |
2084 | return 0; |
2085 | } | |
2086 | return 1; | |
2087 | } | |
1da177e4 | 2088 | |
9d729f72 | 2089 | pol->curlft.use_time = get_seconds(); |
1da177e4 | 2090 | |
4e81bb83 MN |
2091 | pols[0] = pol; |
2092 | npols ++; | |
2093 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2094 | if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { | |
f6e1e25d | 2095 | pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, |
4e81bb83 MN |
2096 | &fl, family, |
2097 | XFRM_POLICY_IN); | |
2098 | if (pols[1]) { | |
0aa64774 | 2099 | if (IS_ERR(pols[1])) { |
59c9940e | 2100 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); |
134b0fc5 | 2101 | return 0; |
0aa64774 | 2102 | } |
9d729f72 | 2103 | pols[1]->curlft.use_time = get_seconds(); |
4e81bb83 MN |
2104 | npols ++; |
2105 | } | |
2106 | } | |
2107 | #endif | |
2108 | ||
1da177e4 LT |
2109 | if (pol->action == XFRM_POLICY_ALLOW) { |
2110 | struct sec_path *sp; | |
2111 | static struct sec_path dummy; | |
4e81bb83 | 2112 | struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; |
41a49cc3 | 2113 | struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; |
4e81bb83 MN |
2114 | struct xfrm_tmpl **tpp = tp; |
2115 | int ti = 0; | |
1da177e4 LT |
2116 | int i, k; |
2117 | ||
2118 | if ((sp = skb->sp) == NULL) | |
2119 | sp = &dummy; | |
2120 | ||
4e81bb83 MN |
2121 | for (pi = 0; pi < npols; pi++) { |
2122 | if (pols[pi] != pol && | |
0aa64774 | 2123 | pols[pi]->action != XFRM_POLICY_ALLOW) { |
59c9940e | 2124 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
4e81bb83 | 2125 | goto reject; |
0aa64774 MN |
2126 | } |
2127 | if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { | |
59c9940e | 2128 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
4e81bb83 | 2129 | goto reject_error; |
0aa64774 | 2130 | } |
4e81bb83 MN |
2131 | for (i = 0; i < pols[pi]->xfrm_nr; i++) |
2132 | tpp[ti++] = &pols[pi]->xfrm_vec[i]; | |
2133 | } | |
2134 | xfrm_nr = ti; | |
41a49cc3 MN |
2135 | if (npols > 1) { |
2136 | xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); | |
2137 | tpp = stp; | |
2138 | } | |
4e81bb83 | 2139 | |
1da177e4 LT |
2140 | /* For each tunnel xfrm, find the first matching tmpl. |
2141 | * For each tmpl before that, find corresponding xfrm. | |
2142 | * Order is _important_. Later we will implement | |
2143 | * some barriers, but at the moment barriers | |
2144 | * are implied between each two transformations. | |
2145 | */ | |
4e81bb83 MN |
2146 | for (i = xfrm_nr-1, k = 0; i >= 0; i--) { |
2147 | k = xfrm_policy_ok(tpp[i], sp, k, family); | |
df0ba92a | 2148 | if (k < 0) { |
d1d9facf JM |
2149 | if (k < -1) |
2150 | /* "-2 - errored_index" returned */ | |
2151 | xerr_idx = -(2+k); | |
59c9940e | 2152 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2153 | goto reject; |
df0ba92a | 2154 | } |
1da177e4 LT |
2155 | } |
2156 | ||
0aa64774 | 2157 | if (secpath_has_nontransport(sp, k, &xerr_idx)) { |
59c9940e | 2158 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); |
1da177e4 | 2159 | goto reject; |
0aa64774 | 2160 | } |
1da177e4 | 2161 | |
4e81bb83 | 2162 | xfrm_pols_put(pols, npols); |
1da177e4 LT |
2163 | return 1; |
2164 | } | |
59c9940e | 2165 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); |
1da177e4 LT |
2166 | |
2167 | reject: | |
df0ba92a | 2168 | xfrm_secpath_reject(xerr_idx, skb, &fl); |
4e81bb83 MN |
2169 | reject_error: |
2170 | xfrm_pols_put(pols, npols); | |
1da177e4 LT |
2171 | return 0; |
2172 | } | |
2173 | EXPORT_SYMBOL(__xfrm_policy_check); | |
2174 | ||
2175 | int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) | |
2176 | { | |
99a66657 | 2177 | struct net *net = dev_net(skb->dev); |
1da177e4 | 2178 | struct flowi fl; |
adf30907 | 2179 | struct dst_entry *dst; |
73137147 | 2180 | int res = 1; |
1da177e4 | 2181 | |
0aa64774 | 2182 | if (xfrm_decode_session(skb, &fl, family) < 0) { |
72032fdb | 2183 | XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); |
1da177e4 | 2184 | return 0; |
0aa64774 | 2185 | } |
1da177e4 | 2186 | |
fafeeb6c | 2187 | skb_dst_force(skb); |
adf30907 | 2188 | |
452edd59 DM |
2189 | dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, 0); |
2190 | if (IS_ERR(dst)) { | |
73137147 | 2191 | res = 0; |
452edd59 DM |
2192 | dst = NULL; |
2193 | } | |
adf30907 ED |
2194 | skb_dst_set(skb, dst); |
2195 | return res; | |
1da177e4 LT |
2196 | } |
2197 | EXPORT_SYMBOL(__xfrm_route_forward); | |
2198 | ||
d49c73c7 DM |
2199 | /* Optimize later using cookies and generation ids. */ |
2200 | ||
1da177e4 LT |
2201 | static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) |
2202 | { | |
d49c73c7 DM |
2203 | /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete |
2204 | * to "-1" to force all XFRM destinations to get validated by | |
2205 | * dst_ops->check on every use. We do this because when a | |
2206 | * normal route referenced by an XFRM dst is obsoleted we do | |
2207 | * not go looking around for all parent referencing XFRM dsts | |
2208 | * so that we can invalidate them. It is just too much work. | |
2209 | * Instead we make the checks here on every use. For example: | |
2210 | * | |
2211 | * XFRM dst A --> IPv4 dst X | |
2212 | * | |
2213 | * X is the "xdst->route" of A (X is also the "dst->path" of A | |
2214 | * in this example). If X is marked obsolete, "A" will not | |
2215 | * notice. That's what we are validating here via the | |
2216 | * stale_bundle() check. | |
2217 | * | |
2218 | * When a policy's bundle is pruned, we dst_free() the XFRM | |
2219 | * dst which causes it's ->obsolete field to be set to a | |
2220 | * positive non-zero integer. If an XFRM dst has been pruned | |
2221 | * like this, we want to force a new route lookup. | |
399c180a | 2222 | */ |
d49c73c7 DM |
2223 | if (dst->obsolete < 0 && !stale_bundle(dst)) |
2224 | return dst; | |
2225 | ||
1da177e4 LT |
2226 | return NULL; |
2227 | } | |
2228 | ||
2229 | static int stale_bundle(struct dst_entry *dst) | |
2230 | { | |
ca116922 | 2231 | return !xfrm_bundle_ok((struct xfrm_dst *)dst, AF_UNSPEC); |
1da177e4 LT |
2232 | } |
2233 | ||
aabc9761 | 2234 | void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 2235 | { |
1da177e4 | 2236 | while ((dst = dst->child) && dst->xfrm && dst->dev == dev) { |
c346dca1 | 2237 | dst->dev = dev_net(dev)->loopback_dev; |
de3cb747 | 2238 | dev_hold(dst->dev); |
1da177e4 LT |
2239 | dev_put(dev); |
2240 | } | |
2241 | } | |
aabc9761 | 2242 | EXPORT_SYMBOL(xfrm_dst_ifdown); |
1da177e4 LT |
2243 | |
2244 | static void xfrm_link_failure(struct sk_buff *skb) | |
2245 | { | |
2246 | /* Impossible. Such dst must be popped before reaches point of failure. */ | |
1da177e4 LT |
2247 | } |
2248 | ||
2249 | static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) | |
2250 | { | |
2251 | if (dst) { | |
2252 | if (dst->obsolete) { | |
2253 | dst_release(dst); | |
2254 | dst = NULL; | |
2255 | } | |
2256 | } | |
2257 | return dst; | |
2258 | } | |
2259 | ||
80c802f3 | 2260 | static void __xfrm_garbage_collect(struct net *net) |
1da177e4 | 2261 | { |
80c802f3 | 2262 | struct dst_entry *head, *next; |
1da177e4 | 2263 | |
80c802f3 | 2264 | flow_cache_flush(); |
4e81bb83 | 2265 | |
80c802f3 TT |
2266 | spin_lock_bh(&xfrm_policy_sk_bundle_lock); |
2267 | head = xfrm_policy_sk_bundles; | |
2268 | xfrm_policy_sk_bundles = NULL; | |
2269 | spin_unlock_bh(&xfrm_policy_sk_bundle_lock); | |
2518c7c2 | 2270 | |
80c802f3 TT |
2271 | while (head) { |
2272 | next = head->next; | |
2273 | dst_free(head); | |
2274 | head = next; | |
1da177e4 LT |
2275 | } |
2276 | } | |
2277 | ||
25ee3286 | 2278 | static void xfrm_init_pmtu(struct dst_entry *dst) |
1da177e4 LT |
2279 | { |
2280 | do { | |
2281 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2282 | u32 pmtu, route_mtu_cached; | |
2283 | ||
2284 | pmtu = dst_mtu(dst->child); | |
2285 | xdst->child_mtu_cached = pmtu; | |
2286 | ||
2287 | pmtu = xfrm_state_mtu(dst->xfrm, pmtu); | |
2288 | ||
2289 | route_mtu_cached = dst_mtu(xdst->route); | |
2290 | xdst->route_mtu_cached = route_mtu_cached; | |
2291 | ||
2292 | if (pmtu > route_mtu_cached) | |
2293 | pmtu = route_mtu_cached; | |
2294 | ||
defb3519 | 2295 | dst_metric_set(dst, RTAX_MTU, pmtu); |
1da177e4 LT |
2296 | } while ((dst = dst->next)); |
2297 | } | |
2298 | ||
1da177e4 LT |
2299 | /* Check that the bundle accepts the flow and its components are |
2300 | * still valid. | |
2301 | */ | |
2302 | ||
ca116922 | 2303 | static int xfrm_bundle_ok(struct xfrm_dst *first, int family) |
1da177e4 LT |
2304 | { |
2305 | struct dst_entry *dst = &first->u.dst; | |
2306 | struct xfrm_dst *last; | |
2307 | u32 mtu; | |
2308 | ||
92d63dec | 2309 | if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) || |
1da177e4 LT |
2310 | (dst->dev && !netif_running(dst->dev))) |
2311 | return 0; | |
2312 | ||
2313 | last = NULL; | |
2314 | ||
2315 | do { | |
2316 | struct xfrm_dst *xdst = (struct xfrm_dst *)dst; | |
2317 | ||
1da177e4 LT |
2318 | if (dst->xfrm->km.state != XFRM_STATE_VALID) |
2319 | return 0; | |
80c802f3 TT |
2320 | if (xdst->xfrm_genid != dst->xfrm->genid) |
2321 | return 0; | |
b1312c89 TT |
2322 | if (xdst->num_pols > 0 && |
2323 | xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) | |
9d4a706d | 2324 | return 0; |
e53820de | 2325 | |
1da177e4 LT |
2326 | mtu = dst_mtu(dst->child); |
2327 | if (xdst->child_mtu_cached != mtu) { | |
2328 | last = xdst; | |
2329 | xdst->child_mtu_cached = mtu; | |
2330 | } | |
2331 | ||
92d63dec | 2332 | if (!dst_check(xdst->route, xdst->route_cookie)) |
1da177e4 LT |
2333 | return 0; |
2334 | mtu = dst_mtu(xdst->route); | |
2335 | if (xdst->route_mtu_cached != mtu) { | |
2336 | last = xdst; | |
2337 | xdst->route_mtu_cached = mtu; | |
2338 | } | |
2339 | ||
2340 | dst = dst->child; | |
2341 | } while (dst->xfrm); | |
2342 | ||
2343 | if (likely(!last)) | |
2344 | return 1; | |
2345 | ||
2346 | mtu = last->child_mtu_cached; | |
2347 | for (;;) { | |
2348 | dst = &last->u.dst; | |
2349 | ||
2350 | mtu = xfrm_state_mtu(dst->xfrm, mtu); | |
2351 | if (mtu > last->route_mtu_cached) | |
2352 | mtu = last->route_mtu_cached; | |
defb3519 | 2353 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
2354 | |
2355 | if (last == first) | |
2356 | break; | |
2357 | ||
bd0bf076 | 2358 | last = (struct xfrm_dst *)last->u.dst.next; |
1da177e4 LT |
2359 | last->child_mtu_cached = mtu; |
2360 | } | |
2361 | ||
2362 | return 1; | |
2363 | } | |
2364 | ||
0dbaee3b DM |
2365 | static unsigned int xfrm_default_advmss(const struct dst_entry *dst) |
2366 | { | |
2367 | return dst_metric_advmss(dst->path); | |
2368 | } | |
2369 | ||
d33e4553 DM |
2370 | static unsigned int xfrm_default_mtu(const struct dst_entry *dst) |
2371 | { | |
2372 | return dst_mtu(dst->path); | |
2373 | } | |
2374 | ||
1da177e4 LT |
2375 | int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo) |
2376 | { | |
d7c7544c | 2377 | struct net *net; |
1da177e4 LT |
2378 | int err = 0; |
2379 | if (unlikely(afinfo == NULL)) | |
2380 | return -EINVAL; | |
2381 | if (unlikely(afinfo->family >= NPROTO)) | |
2382 | return -EAFNOSUPPORT; | |
e959d812 | 2383 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2384 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL)) |
2385 | err = -ENOBUFS; | |
2386 | else { | |
2387 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2388 | if (likely(dst_ops->kmem_cachep == NULL)) | |
2389 | dst_ops->kmem_cachep = xfrm_dst_cache; | |
2390 | if (likely(dst_ops->check == NULL)) | |
2391 | dst_ops->check = xfrm_dst_check; | |
0dbaee3b DM |
2392 | if (likely(dst_ops->default_advmss == NULL)) |
2393 | dst_ops->default_advmss = xfrm_default_advmss; | |
d33e4553 DM |
2394 | if (likely(dst_ops->default_mtu == NULL)) |
2395 | dst_ops->default_mtu = xfrm_default_mtu; | |
1da177e4 LT |
2396 | if (likely(dst_ops->negative_advice == NULL)) |
2397 | dst_ops->negative_advice = xfrm_negative_advice; | |
2398 | if (likely(dst_ops->link_failure == NULL)) | |
2399 | dst_ops->link_failure = xfrm_link_failure; | |
1da177e4 LT |
2400 | if (likely(afinfo->garbage_collect == NULL)) |
2401 | afinfo->garbage_collect = __xfrm_garbage_collect; | |
2402 | xfrm_policy_afinfo[afinfo->family] = afinfo; | |
2403 | } | |
e959d812 | 2404 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
d7c7544c AD |
2405 | |
2406 | rtnl_lock(); | |
2407 | for_each_net(net) { | |
2408 | struct dst_ops *xfrm_dst_ops; | |
2409 | ||
2410 | switch (afinfo->family) { | |
2411 | case AF_INET: | |
2412 | xfrm_dst_ops = &net->xfrm.xfrm4_dst_ops; | |
2413 | break; | |
2414 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2415 | case AF_INET6: | |
2416 | xfrm_dst_ops = &net->xfrm.xfrm6_dst_ops; | |
2417 | break; | |
2418 | #endif | |
2419 | default: | |
2420 | BUG(); | |
2421 | } | |
2422 | *xfrm_dst_ops = *afinfo->dst_ops; | |
2423 | } | |
2424 | rtnl_unlock(); | |
2425 | ||
1da177e4 LT |
2426 | return err; |
2427 | } | |
2428 | EXPORT_SYMBOL(xfrm_policy_register_afinfo); | |
2429 | ||
2430 | int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2431 | { | |
2432 | int err = 0; | |
2433 | if (unlikely(afinfo == NULL)) | |
2434 | return -EINVAL; | |
2435 | if (unlikely(afinfo->family >= NPROTO)) | |
2436 | return -EAFNOSUPPORT; | |
e959d812 | 2437 | write_lock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2438 | if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) { |
2439 | if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo)) | |
2440 | err = -EINVAL; | |
2441 | else { | |
2442 | struct dst_ops *dst_ops = afinfo->dst_ops; | |
2443 | xfrm_policy_afinfo[afinfo->family] = NULL; | |
2444 | dst_ops->kmem_cachep = NULL; | |
2445 | dst_ops->check = NULL; | |
1da177e4 LT |
2446 | dst_ops->negative_advice = NULL; |
2447 | dst_ops->link_failure = NULL; | |
1da177e4 LT |
2448 | afinfo->garbage_collect = NULL; |
2449 | } | |
2450 | } | |
e959d812 | 2451 | write_unlock_bh(&xfrm_policy_afinfo_lock); |
1da177e4 LT |
2452 | return err; |
2453 | } | |
2454 | EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); | |
2455 | ||
d7c7544c AD |
2456 | static void __net_init xfrm_dst_ops_init(struct net *net) |
2457 | { | |
2458 | struct xfrm_policy_afinfo *afinfo; | |
2459 | ||
2460 | read_lock_bh(&xfrm_policy_afinfo_lock); | |
2461 | afinfo = xfrm_policy_afinfo[AF_INET]; | |
2462 | if (afinfo) | |
2463 | net->xfrm.xfrm4_dst_ops = *afinfo->dst_ops; | |
2464 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
2465 | afinfo = xfrm_policy_afinfo[AF_INET6]; | |
2466 | if (afinfo) | |
2467 | net->xfrm.xfrm6_dst_ops = *afinfo->dst_ops; | |
2468 | #endif | |
2469 | read_unlock_bh(&xfrm_policy_afinfo_lock); | |
2470 | } | |
2471 | ||
1da177e4 LT |
2472 | static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) |
2473 | { | |
2474 | struct xfrm_policy_afinfo *afinfo; | |
2475 | if (unlikely(family >= NPROTO)) | |
2476 | return NULL; | |
2477 | read_lock(&xfrm_policy_afinfo_lock); | |
2478 | afinfo = xfrm_policy_afinfo[family]; | |
546be240 HX |
2479 | if (unlikely(!afinfo)) |
2480 | read_unlock(&xfrm_policy_afinfo_lock); | |
1da177e4 LT |
2481 | return afinfo; |
2482 | } | |
2483 | ||
2484 | static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo) | |
2485 | { | |
546be240 HX |
2486 | read_unlock(&xfrm_policy_afinfo_lock); |
2487 | } | |
2488 | ||
1da177e4 LT |
2489 | static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) |
2490 | { | |
e9dc8653 EB |
2491 | struct net_device *dev = ptr; |
2492 | ||
1da177e4 LT |
2493 | switch (event) { |
2494 | case NETDEV_DOWN: | |
80c802f3 | 2495 | __xfrm_garbage_collect(dev_net(dev)); |
1da177e4 LT |
2496 | } |
2497 | return NOTIFY_DONE; | |
2498 | } | |
2499 | ||
2500 | static struct notifier_block xfrm_dev_notifier = { | |
d5917a35 | 2501 | .notifier_call = xfrm_dev_event, |
1da177e4 LT |
2502 | }; |
2503 | ||
558f82ef | 2504 | #ifdef CONFIG_XFRM_STATISTICS |
59c9940e | 2505 | static int __net_init xfrm_statistics_init(struct net *net) |
558f82ef | 2506 | { |
c68cd1a0 AD |
2507 | int rv; |
2508 | ||
7d720c3e | 2509 | if (snmp_mib_init((void __percpu **)net->mib.xfrm_statistics, |
1823e4c8 ED |
2510 | sizeof(struct linux_xfrm_mib), |
2511 | __alignof__(struct linux_xfrm_mib)) < 0) | |
558f82ef | 2512 | return -ENOMEM; |
c68cd1a0 AD |
2513 | rv = xfrm_proc_init(net); |
2514 | if (rv < 0) | |
7d720c3e | 2515 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
c68cd1a0 | 2516 | return rv; |
558f82ef | 2517 | } |
59c9940e AD |
2518 | |
2519 | static void xfrm_statistics_fini(struct net *net) | |
2520 | { | |
c68cd1a0 | 2521 | xfrm_proc_fini(net); |
7d720c3e | 2522 | snmp_mib_free((void __percpu **)net->mib.xfrm_statistics); |
59c9940e AD |
2523 | } |
2524 | #else | |
2525 | static int __net_init xfrm_statistics_init(struct net *net) | |
2526 | { | |
2527 | return 0; | |
2528 | } | |
2529 | ||
2530 | static void xfrm_statistics_fini(struct net *net) | |
2531 | { | |
2532 | } | |
558f82ef MN |
2533 | #endif |
2534 | ||
d62ddc21 | 2535 | static int __net_init xfrm_policy_init(struct net *net) |
1da177e4 | 2536 | { |
2518c7c2 DM |
2537 | unsigned int hmask, sz; |
2538 | int dir; | |
2539 | ||
d62ddc21 AD |
2540 | if (net_eq(net, &init_net)) |
2541 | xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", | |
1da177e4 | 2542 | sizeof(struct xfrm_dst), |
e5d679f3 | 2543 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2544 | NULL); |
1da177e4 | 2545 | |
2518c7c2 DM |
2546 | hmask = 8 - 1; |
2547 | sz = (hmask+1) * sizeof(struct hlist_head); | |
2548 | ||
93b851c1 AD |
2549 | net->xfrm.policy_byidx = xfrm_hash_alloc(sz); |
2550 | if (!net->xfrm.policy_byidx) | |
2551 | goto out_byidx; | |
8100bea7 | 2552 | net->xfrm.policy_idx_hmask = hmask; |
2518c7c2 DM |
2553 | |
2554 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { | |
2555 | struct xfrm_policy_hash *htab; | |
2556 | ||
dc2caba7 | 2557 | net->xfrm.policy_count[dir] = 0; |
8b18f8ea | 2558 | INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); |
2518c7c2 | 2559 | |
a35f6c5d | 2560 | htab = &net->xfrm.policy_bydst[dir]; |
44e36b42 | 2561 | htab->table = xfrm_hash_alloc(sz); |
2518c7c2 | 2562 | if (!htab->table) |
a35f6c5d AD |
2563 | goto out_bydst; |
2564 | htab->hmask = hmask; | |
2518c7c2 DM |
2565 | } |
2566 | ||
adfcf0b2 | 2567 | INIT_LIST_HEAD(&net->xfrm.policy_all); |
66caf628 | 2568 | INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); |
d62ddc21 AD |
2569 | if (net_eq(net, &init_net)) |
2570 | register_netdevice_notifier(&xfrm_dev_notifier); | |
2571 | return 0; | |
93b851c1 | 2572 | |
a35f6c5d AD |
2573 | out_bydst: |
2574 | for (dir--; dir >= 0; dir--) { | |
2575 | struct xfrm_policy_hash *htab; | |
2576 | ||
2577 | htab = &net->xfrm.policy_bydst[dir]; | |
2578 | xfrm_hash_free(htab->table, sz); | |
2579 | } | |
2580 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
93b851c1 AD |
2581 | out_byidx: |
2582 | return -ENOMEM; | |
d62ddc21 AD |
2583 | } |
2584 | ||
2585 | static void xfrm_policy_fini(struct net *net) | |
2586 | { | |
7c2776ee | 2587 | struct xfrm_audit audit_info; |
93b851c1 | 2588 | unsigned int sz; |
8b18f8ea | 2589 | int dir; |
93b851c1 | 2590 | |
7c2776ee AD |
2591 | flush_work(&net->xfrm.policy_hash_work); |
2592 | #ifdef CONFIG_XFRM_SUB_POLICY | |
2593 | audit_info.loginuid = -1; | |
2594 | audit_info.sessionid = -1; | |
2595 | audit_info.secid = 0; | |
2596 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, &audit_info); | |
2597 | #endif | |
2598 | audit_info.loginuid = -1; | |
2599 | audit_info.sessionid = -1; | |
2600 | audit_info.secid = 0; | |
2601 | xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); | |
7c2776ee | 2602 | |
adfcf0b2 | 2603 | WARN_ON(!list_empty(&net->xfrm.policy_all)); |
93b851c1 | 2604 | |
8b18f8ea | 2605 | for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) { |
a35f6c5d AD |
2606 | struct xfrm_policy_hash *htab; |
2607 | ||
8b18f8ea | 2608 | WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); |
a35f6c5d AD |
2609 | |
2610 | htab = &net->xfrm.policy_bydst[dir]; | |
2611 | sz = (htab->hmask + 1); | |
2612 | WARN_ON(!hlist_empty(htab->table)); | |
2613 | xfrm_hash_free(htab->table, sz); | |
8b18f8ea AD |
2614 | } |
2615 | ||
8100bea7 | 2616 | sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); |
93b851c1 AD |
2617 | WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); |
2618 | xfrm_hash_free(net->xfrm.policy_byidx, sz); | |
1da177e4 LT |
2619 | } |
2620 | ||
d62ddc21 AD |
2621 | static int __net_init xfrm_net_init(struct net *net) |
2622 | { | |
2623 | int rv; | |
2624 | ||
59c9940e AD |
2625 | rv = xfrm_statistics_init(net); |
2626 | if (rv < 0) | |
2627 | goto out_statistics; | |
d62ddc21 AD |
2628 | rv = xfrm_state_init(net); |
2629 | if (rv < 0) | |
2630 | goto out_state; | |
2631 | rv = xfrm_policy_init(net); | |
2632 | if (rv < 0) | |
2633 | goto out_policy; | |
d7c7544c | 2634 | xfrm_dst_ops_init(net); |
b27aeadb AD |
2635 | rv = xfrm_sysctl_init(net); |
2636 | if (rv < 0) | |
2637 | goto out_sysctl; | |
d62ddc21 AD |
2638 | return 0; |
2639 | ||
b27aeadb AD |
2640 | out_sysctl: |
2641 | xfrm_policy_fini(net); | |
d62ddc21 AD |
2642 | out_policy: |
2643 | xfrm_state_fini(net); | |
2644 | out_state: | |
59c9940e AD |
2645 | xfrm_statistics_fini(net); |
2646 | out_statistics: | |
d62ddc21 AD |
2647 | return rv; |
2648 | } | |
2649 | ||
2650 | static void __net_exit xfrm_net_exit(struct net *net) | |
2651 | { | |
b27aeadb | 2652 | xfrm_sysctl_fini(net); |
d62ddc21 AD |
2653 | xfrm_policy_fini(net); |
2654 | xfrm_state_fini(net); | |
59c9940e | 2655 | xfrm_statistics_fini(net); |
d62ddc21 AD |
2656 | } |
2657 | ||
2658 | static struct pernet_operations __net_initdata xfrm_net_ops = { | |
2659 | .init = xfrm_net_init, | |
2660 | .exit = xfrm_net_exit, | |
2661 | }; | |
2662 | ||
1da177e4 LT |
2663 | void __init xfrm_init(void) |
2664 | { | |
d62ddc21 | 2665 | register_pernet_subsys(&xfrm_net_ops); |
1da177e4 LT |
2666 | xfrm_input_init(); |
2667 | } | |
2668 | ||
ab5f5e8b | 2669 | #ifdef CONFIG_AUDITSYSCALL |
1486cbd7 IJ |
2670 | static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, |
2671 | struct audit_buffer *audit_buf) | |
ab5f5e8b | 2672 | { |
875179fa PM |
2673 | struct xfrm_sec_ctx *ctx = xp->security; |
2674 | struct xfrm_selector *sel = &xp->selector; | |
2675 | ||
2676 | if (ctx) | |
ab5f5e8b | 2677 | audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", |
875179fa | 2678 | ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); |
ab5f5e8b | 2679 | |
875179fa | 2680 | switch(sel->family) { |
ab5f5e8b | 2681 | case AF_INET: |
21454aaa | 2682 | audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); |
875179fa PM |
2683 | if (sel->prefixlen_s != 32) |
2684 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2685 | sel->prefixlen_s); | |
21454aaa | 2686 | audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); |
875179fa PM |
2687 | if (sel->prefixlen_d != 32) |
2688 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2689 | sel->prefixlen_d); | |
ab5f5e8b JL |
2690 | break; |
2691 | case AF_INET6: | |
5b095d98 | 2692 | audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); |
875179fa PM |
2693 | if (sel->prefixlen_s != 128) |
2694 | audit_log_format(audit_buf, " src_prefixlen=%d", | |
2695 | sel->prefixlen_s); | |
5b095d98 | 2696 | audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); |
875179fa PM |
2697 | if (sel->prefixlen_d != 128) |
2698 | audit_log_format(audit_buf, " dst_prefixlen=%d", | |
2699 | sel->prefixlen_d); | |
ab5f5e8b JL |
2700 | break; |
2701 | } | |
2702 | } | |
2703 | ||
68277acc | 2704 | void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, |
2532386f | 2705 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2706 | { |
2707 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2708 | |
afeb14b4 | 2709 | audit_buf = xfrm_audit_start("SPD-add"); |
ab5f5e8b JL |
2710 | if (audit_buf == NULL) |
2711 | return; | |
2532386f | 2712 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2713 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2714 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2715 | audit_log_end(audit_buf); | |
2716 | } | |
2717 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); | |
2718 | ||
68277acc | 2719 | void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, |
2532386f | 2720 | uid_t auid, u32 sessionid, u32 secid) |
ab5f5e8b JL |
2721 | { |
2722 | struct audit_buffer *audit_buf; | |
ab5f5e8b | 2723 | |
afeb14b4 | 2724 | audit_buf = xfrm_audit_start("SPD-delete"); |
ab5f5e8b JL |
2725 | if (audit_buf == NULL) |
2726 | return; | |
2532386f | 2727 | xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf); |
afeb14b4 | 2728 | audit_log_format(audit_buf, " res=%u", result); |
ab5f5e8b JL |
2729 | xfrm_audit_common_policyinfo(xp, audit_buf); |
2730 | audit_log_end(audit_buf); | |
2731 | } | |
2732 | EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); | |
2733 | #endif | |
2734 | ||
80c9abaa | 2735 | #ifdef CONFIG_XFRM_MIGRATE |
b4b7c0b3 DM |
2736 | static int xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, |
2737 | const struct xfrm_selector *sel_tgt) | |
80c9abaa SS |
2738 | { |
2739 | if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { | |
2740 | if (sel_tgt->family == sel_cmp->family && | |
2741 | xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr, | |
a716c119 | 2742 | sel_cmp->family) == 0 && |
80c9abaa SS |
2743 | xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr, |
2744 | sel_cmp->family) == 0 && | |
2745 | sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && | |
2746 | sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { | |
2747 | return 1; | |
2748 | } | |
2749 | } else { | |
2750 | if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { | |
2751 | return 1; | |
2752 | } | |
2753 | } | |
2754 | return 0; | |
2755 | } | |
2756 | ||
b4b7c0b3 | 2757 | static struct xfrm_policy * xfrm_migrate_policy_find(const struct xfrm_selector *sel, |
80c9abaa SS |
2758 | u8 dir, u8 type) |
2759 | { | |
2760 | struct xfrm_policy *pol, *ret = NULL; | |
2761 | struct hlist_node *entry; | |
2762 | struct hlist_head *chain; | |
2763 | u32 priority = ~0U; | |
2764 | ||
2765 | read_lock_bh(&xfrm_policy_lock); | |
1121994c | 2766 | chain = policy_hash_direct(&init_net, &sel->daddr, &sel->saddr, sel->family, dir); |
80c9abaa SS |
2767 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2768 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2769 | pol->type == type) { | |
2770 | ret = pol; | |
2771 | priority = ret->priority; | |
2772 | break; | |
2773 | } | |
2774 | } | |
8b18f8ea | 2775 | chain = &init_net.xfrm.policy_inexact[dir]; |
80c9abaa SS |
2776 | hlist_for_each_entry(pol, entry, chain, bydst) { |
2777 | if (xfrm_migrate_selector_match(sel, &pol->selector) && | |
2778 | pol->type == type && | |
2779 | pol->priority < priority) { | |
2780 | ret = pol; | |
2781 | break; | |
2782 | } | |
2783 | } | |
2784 | ||
2785 | if (ret) | |
2786 | xfrm_pol_hold(ret); | |
2787 | ||
2788 | read_unlock_bh(&xfrm_policy_lock); | |
2789 | ||
2790 | return ret; | |
2791 | } | |
2792 | ||
dd701754 | 2793 | static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) |
80c9abaa SS |
2794 | { |
2795 | int match = 0; | |
2796 | ||
2797 | if (t->mode == m->mode && t->id.proto == m->proto && | |
2798 | (m->reqid == 0 || t->reqid == m->reqid)) { | |
2799 | switch (t->mode) { | |
2800 | case XFRM_MODE_TUNNEL: | |
2801 | case XFRM_MODE_BEET: | |
2802 | if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr, | |
2803 | m->old_family) == 0 && | |
2804 | xfrm_addr_cmp(&t->saddr, &m->old_saddr, | |
2805 | m->old_family) == 0) { | |
2806 | match = 1; | |
2807 | } | |
2808 | break; | |
2809 | case XFRM_MODE_TRANSPORT: | |
2810 | /* in case of transport mode, template does not store | |
2811 | any IP addresses, hence we just compare mode and | |
2812 | protocol */ | |
2813 | match = 1; | |
2814 | break; | |
2815 | default: | |
2816 | break; | |
2817 | } | |
2818 | } | |
2819 | return match; | |
2820 | } | |
2821 | ||
2822 | /* update endpoint address(es) of template(s) */ | |
2823 | static int xfrm_policy_migrate(struct xfrm_policy *pol, | |
2824 | struct xfrm_migrate *m, int num_migrate) | |
2825 | { | |
2826 | struct xfrm_migrate *mp; | |
80c9abaa SS |
2827 | int i, j, n = 0; |
2828 | ||
2829 | write_lock_bh(&pol->lock); | |
12a169e7 | 2830 | if (unlikely(pol->walk.dead)) { |
80c9abaa SS |
2831 | /* target policy has been deleted */ |
2832 | write_unlock_bh(&pol->lock); | |
2833 | return -ENOENT; | |
2834 | } | |
2835 | ||
2836 | for (i = 0; i < pol->xfrm_nr; i++) { | |
2837 | for (j = 0, mp = m; j < num_migrate; j++, mp++) { | |
2838 | if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) | |
2839 | continue; | |
2840 | n++; | |
1bfcb10f HX |
2841 | if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && |
2842 | pol->xfrm_vec[i].mode != XFRM_MODE_BEET) | |
80c9abaa SS |
2843 | continue; |
2844 | /* update endpoints */ | |
2845 | memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, | |
2846 | sizeof(pol->xfrm_vec[i].id.daddr)); | |
2847 | memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, | |
2848 | sizeof(pol->xfrm_vec[i].saddr)); | |
2849 | pol->xfrm_vec[i].encap_family = mp->new_family; | |
2850 | /* flush bundles */ | |
80c802f3 | 2851 | atomic_inc(&pol->genid); |
80c9abaa SS |
2852 | } |
2853 | } | |
2854 | ||
2855 | write_unlock_bh(&pol->lock); | |
2856 | ||
2857 | if (!n) | |
2858 | return -ENODATA; | |
2859 | ||
2860 | return 0; | |
2861 | } | |
2862 | ||
dd701754 | 2863 | static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) |
80c9abaa SS |
2864 | { |
2865 | int i, j; | |
2866 | ||
2867 | if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) | |
2868 | return -EINVAL; | |
2869 | ||
2870 | for (i = 0; i < num_migrate; i++) { | |
2871 | if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr, | |
2872 | m[i].old_family) == 0) && | |
2873 | (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr, | |
2874 | m[i].old_family) == 0)) | |
2875 | return -EINVAL; | |
2876 | if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || | |
2877 | xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) | |
2878 | return -EINVAL; | |
2879 | ||
2880 | /* check if there is any duplicated entry */ | |
2881 | for (j = i + 1; j < num_migrate; j++) { | |
2882 | if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, | |
2883 | sizeof(m[i].old_daddr)) && | |
2884 | !memcmp(&m[i].old_saddr, &m[j].old_saddr, | |
2885 | sizeof(m[i].old_saddr)) && | |
2886 | m[i].proto == m[j].proto && | |
2887 | m[i].mode == m[j].mode && | |
2888 | m[i].reqid == m[j].reqid && | |
2889 | m[i].old_family == m[j].old_family) | |
2890 | return -EINVAL; | |
2891 | } | |
2892 | } | |
2893 | ||
2894 | return 0; | |
2895 | } | |
2896 | ||
b4b7c0b3 | 2897 | int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, |
13c1d189 AE |
2898 | struct xfrm_migrate *m, int num_migrate, |
2899 | struct xfrm_kmaddress *k) | |
80c9abaa SS |
2900 | { |
2901 | int i, err, nx_cur = 0, nx_new = 0; | |
2902 | struct xfrm_policy *pol = NULL; | |
2903 | struct xfrm_state *x, *xc; | |
2904 | struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; | |
2905 | struct xfrm_state *x_new[XFRM_MAX_DEPTH]; | |
2906 | struct xfrm_migrate *mp; | |
2907 | ||
2908 | if ((err = xfrm_migrate_check(m, num_migrate)) < 0) | |
2909 | goto out; | |
2910 | ||
2911 | /* Stage 1 - find policy */ | |
2912 | if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) { | |
2913 | err = -ENOENT; | |
2914 | goto out; | |
2915 | } | |
2916 | ||
2917 | /* Stage 2 - find and update state(s) */ | |
2918 | for (i = 0, mp = m; i < num_migrate; i++, mp++) { | |
2919 | if ((x = xfrm_migrate_state_find(mp))) { | |
2920 | x_cur[nx_cur] = x; | |
2921 | nx_cur++; | |
2922 | if ((xc = xfrm_state_migrate(x, mp))) { | |
2923 | x_new[nx_new] = xc; | |
2924 | nx_new++; | |
2925 | } else { | |
2926 | err = -ENODATA; | |
2927 | goto restore_state; | |
2928 | } | |
2929 | } | |
2930 | } | |
2931 | ||
2932 | /* Stage 3 - update policy */ | |
2933 | if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) | |
2934 | goto restore_state; | |
2935 | ||
2936 | /* Stage 4 - delete old state(s) */ | |
2937 | if (nx_cur) { | |
2938 | xfrm_states_put(x_cur, nx_cur); | |
2939 | xfrm_states_delete(x_cur, nx_cur); | |
2940 | } | |
2941 | ||
2942 | /* Stage 5 - announce */ | |
13c1d189 | 2943 | km_migrate(sel, dir, type, m, num_migrate, k); |
80c9abaa SS |
2944 | |
2945 | xfrm_pol_put(pol); | |
2946 | ||
2947 | return 0; | |
2948 | out: | |
2949 | return err; | |
2950 | ||
2951 | restore_state: | |
2952 | if (pol) | |
2953 | xfrm_pol_put(pol); | |
2954 | if (nx_cur) | |
2955 | xfrm_states_put(x_cur, nx_cur); | |
2956 | if (nx_new) | |
2957 | xfrm_states_delete(x_new, nx_new); | |
2958 | ||
2959 | return err; | |
2960 | } | |
e610e679 | 2961 | EXPORT_SYMBOL(xfrm_migrate); |
80c9abaa | 2962 | #endif |